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annotate src/share/vm/oops/cpCache.hpp @ 17977:0b9500028980

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8029381: assert(is_method_type()) failed: bad cast Summary: Access to method_type and appendix from constant pool (cpcache) needs to be guarded by is_f1_null() because of racy update/initialization. Reviewed-by: kvn, coleenp, jrose
author drchase
date Mon, 02 Jun 2014 14:32:29 -0400
parents 3205e78d8193
children 52b4284cb496 ce8f6bb717c9
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1 /*
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2 * Copyright (c) 1998, 2014, 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 // The ConstantPoolCache is not a cache! It is the resolution table that the
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35 // interpreter uses to avoid going into the runtime and a way to access resolved
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36 // values.
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37
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38 // A ConstantPoolCacheEntry describes an individual entry of the constant
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39 // pool cache. There's 2 principal kinds of entries: field entries for in-
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40 // stance & static field access, and method entries for invokes. Some of
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41 // the entry layout is shared and looks as follows:
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42 //
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43 // bit number |31 0|
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44 // bit length |-8--|-8--|---16----|
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45 // --------------------------------
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46 // _indices [ b2 | b1 | index ] index = constant_pool_index
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47 // _f1 [ entry specific ] metadata ptr (method or klass)
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48 // _f2 [ entry specific ] vtable or res_ref index, or vfinal method ptr
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49 // _flags [tos|0|F=1|0|0|0|f|v|0 |0000|field_index] (for field entries)
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50 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|----16-----]
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51 // _flags [tos|0|F=0|M|A|I|f|0|vf|0000|00000|psize] (for method entries)
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52 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|--8--|--8--]
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53
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54 // --------------------------------
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55 //
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56 // with:
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57 // index = original constant pool index
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58 // b1 = bytecode 1
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59 // b2 = bytecode 2
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60 // psize = parameters size (method entries only)
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61 // field_index = index into field information in holder InstanceKlass
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62 // The index max is 0xffff (max number of fields in constant pool)
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63 // and is multiplied by (InstanceKlass::next_offset) when accessing.
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64 // tos = TosState
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65 // F = the entry is for a field (or F=0 for a method)
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66 // A = call site has an appendix argument (loaded from resolved references)
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67 // I = interface call is forced virtual (must use a vtable index or vfinal)
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68 // f = field or method is final
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69 // v = field is volatile
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70 // vf = virtual but final (method entries only: is_vfinal())
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71 //
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72 // The flags after TosState have the following interpretation:
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73 // bit 27: 0 for fields, 1 for methods
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74 // f flag true if field is marked final
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75 // v flag true if field is volatile (only for fields)
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76 // f2 flag true if f2 contains an oop (e.g., virtual final method)
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77 // fv flag true if invokeinterface used for method in class Object
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78 //
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79 // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 8 with the
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80 // following mapping to the TosState states:
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81 //
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82 // btos: 0
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83 // ctos: 1
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84 // stos: 2
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85 // itos: 3
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86 // ltos: 4
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87 // ftos: 5
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88 // dtos: 6
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89 // atos: 7
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90 // vtos: 8
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91 //
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92 // Entry specific: field entries:
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93 // _indices = get (b1 section) and put (b2 section) bytecodes, original constant pool index
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94 // _f1 = field holder (as a java.lang.Class, not a Klass*)
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95 // _f2 = field offset in bytes
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96 // _flags = field type information, original FieldInfo index in field holder
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97 // (field_index section)
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98 //
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99 // Entry specific: method entries:
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100 // _indices = invoke code for f1 (b1 section), invoke code for f2 (b2 section),
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101 // original constant pool index
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102 // _f1 = Method* for non-virtual calls, unused by virtual calls.
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103 // for interface calls, which are essentially virtual but need a klass,
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104 // contains Klass* for the corresponding interface.
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105 // for invokedynamic, f1 contains a site-specific CallSite object (as an appendix)
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106 // for invokehandle, f1 contains a site-specific MethodType object (as an appendix)
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107 // (upcoming metadata changes will move the appendix to a separate array)
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108 // _f2 = vtable/itable index (or final Method*) for virtual calls only,
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109 // unused by non-virtual. The is_vfinal flag indicates this is a
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110 // method pointer for a final method, not an index.
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111 // _flags = method type info (t section),
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112 // virtual final bit (vfinal),
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113 // parameter size (psize section)
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114 //
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115 // Note: invokevirtual & invokespecial bytecodes can share the same constant
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116 // pool entry and thus the same constant pool cache entry. All invoke
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117 // bytecodes but invokevirtual use only _f1 and the corresponding b1
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118 // bytecode, while invokevirtual uses only _f2 and the corresponding
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119 // b2 bytecode. The value of _flags is shared for both types of entries.
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120 //
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121 // The fields are volatile so that they are stored in the order written in the
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122 // source code. The _indices field with the bytecode must be written last.
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123
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124 class CallInfo;
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125
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126 class ConstantPoolCacheEntry VALUE_OBJ_CLASS_SPEC {
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127 friend class VMStructs;
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128 friend class constantPoolCacheKlass;
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129 friend class ConstantPool;
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130 friend class InterpreterRuntime;
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131
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132 private:
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133 volatile intx _indices; // constant pool index & rewrite bytecodes
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134 volatile Metadata* _f1; // entry specific metadata field
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135 volatile intx _f2; // entry specific int/metadata field
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136 volatile intx _flags; // flags
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137
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138
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139 void set_bytecode_1(Bytecodes::Code code);
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140 void set_bytecode_2(Bytecodes::Code code);
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141 void set_f1(Metadata* f1) {
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142 Metadata* existing_f1 = (Metadata*)_f1; // read once
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143 assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change");
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144 _f1 = f1;
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145 }
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146 void release_set_f1(Metadata* f1);
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147 void set_f2(intx f2) {
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148 intx existing_f2 = _f2; // read once
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149 assert(existing_f2 == 0 || existing_f2 == f2, "illegal field change");
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150 _f2 = f2;
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151 }
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152 void set_f2_as_vfinal_method(Method* f2) {
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153 assert(is_vfinal(), "flags must be set");
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154 set_f2((intx)f2);
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155 }
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156 int make_flags(TosState state, int option_bits, int field_index_or_method_params);
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157 void set_flags(intx flags) { _flags = flags; }
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158 bool init_flags_atomic(intx flags);
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159 void set_field_flags(TosState field_type, int option_bits, int field_index) {
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160 assert((field_index & field_index_mask) == field_index, "field_index in range");
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161 set_flags(make_flags(field_type, option_bits | (1 << is_field_entry_shift), field_index));
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162 }
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163 void set_method_flags(TosState return_type, int option_bits, int method_params) {
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164 assert((method_params & parameter_size_mask) == method_params, "method_params in range");
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165 set_flags(make_flags(return_type, option_bits, method_params));
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166 }
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167 bool init_method_flags_atomic(TosState return_type, int option_bits, int method_params) {
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168 assert((method_params & parameter_size_mask) == method_params, "method_params in range");
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169 return init_flags_atomic(make_flags(return_type, option_bits, method_params));
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170 }
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171
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172 public:
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173 // specific bit definitions for the flags field:
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174 // (Note: the interpreter must use these definitions to access the CP cache.)
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175 enum {
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176 // high order bits are the TosState corresponding to field type or method return type
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177 tos_state_bits = 4,
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178 tos_state_mask = right_n_bits(tos_state_bits),
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179 tos_state_shift = BitsPerInt - tos_state_bits, // see verify_tos_state_shift below
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180 // misc. option bits; can be any bit position in [16..27]
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181 is_field_entry_shift = 26, // (F) is it a field or a method?
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182 has_method_type_shift = 25, // (M) does the call site have a MethodType?
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183 has_appendix_shift = 24, // (A) does the call site have an appendix argument?
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184 is_forced_virtual_shift = 23, // (I) is the interface reference forced to virtual mode?
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185 is_final_shift = 22, // (f) is the field or method final?
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186 is_volatile_shift = 21, // (v) is the field volatile?
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187 is_vfinal_shift = 20, // (vf) did the call resolve to a final method?
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188 // low order bits give field index (for FieldInfo) or method parameter size:
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189 field_index_bits = 16,
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190 field_index_mask = right_n_bits(field_index_bits),
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191 parameter_size_bits = 8, // subset of field_index_mask, range is 0..255
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192 parameter_size_mask = right_n_bits(parameter_size_bits),
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193 option_bits_mask = ~(((-1) << tos_state_shift) | (field_index_mask | parameter_size_mask))
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194 };
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195
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196 // specific bit definitions for the indices field:
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197 enum {
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198 cp_index_bits = 2*BitsPerByte,
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199 cp_index_mask = right_n_bits(cp_index_bits),
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200 bytecode_1_shift = cp_index_bits,
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201 bytecode_1_mask = right_n_bits(BitsPerByte), // == (u1)0xFF
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202 bytecode_2_shift = cp_index_bits + BitsPerByte,
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203 bytecode_2_mask = right_n_bits(BitsPerByte) // == (u1)0xFF
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204 };
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205
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206
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207 // Initialization
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208 void initialize_entry(int original_index); // initialize primary entry
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209 void initialize_resolved_reference_index(int ref_index) {
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210 assert(_f2 == 0, "set once"); // note: ref_index might be zero also
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211 _f2 = ref_index;
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212 }
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213
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214 void set_field( // sets entry to resolved field state
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215 Bytecodes::Code get_code, // the bytecode used for reading the field
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216 Bytecodes::Code put_code, // the bytecode used for writing the field
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217 KlassHandle field_holder, // the object/klass holding the field
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218 int orig_field_index, // the original field index in the field holder
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219 int field_offset, // the field offset in words in the field holder
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220 TosState field_type, // the (machine) field type
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221 bool is_final, // the field is final
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222 bool is_volatile, // the field is volatile
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223 Klass* root_klass // needed by the GC to dirty the klass
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224 );
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225
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226 private:
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227 void set_direct_or_vtable_call(
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228 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
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229 methodHandle method, // the method/prototype if any (NULL, otherwise)
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230 int vtable_index // the vtable index if any, else negative
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231 );
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232
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233 public:
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234 void set_direct_call( // sets entry to exact concrete method entry
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235 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
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236 methodHandle method // the method to call
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237 );
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238
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239 void set_vtable_call( // sets entry to vtable index
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240 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
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241 methodHandle method, // resolved method which declares the vtable index
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242 int vtable_index // the vtable index
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243 );
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244
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245 void set_itable_call(
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246 Bytecodes::Code invoke_code, // the bytecode used; must be invokeinterface
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247 methodHandle method, // the resolved interface method
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248 int itable_index // index into itable for the method
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249 );
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250
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251 void set_method_handle(
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252 constantPoolHandle cpool, // holding constant pool (required for locking)
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253 const CallInfo &call_info // Call link information
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254 );
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255
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256 void set_dynamic_call(
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257 constantPoolHandle cpool, // holding constant pool (required for locking)
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258 const CallInfo &call_info // Call link information
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259 );
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260
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261 // Common code for invokedynamic and MH invocations.
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262
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263 // The "appendix" is an optional call-site-specific parameter which is
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264 // pushed by the JVM at the end of the argument list. This argument may
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265 // be a MethodType for the MH.invokes and a CallSite for an invokedynamic
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266 // instruction. However, its exact type and use depends on the Java upcall,
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267 // which simply returns a compiled LambdaForm along with any reference
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268 // that LambdaForm needs to complete the call. If the upcall returns a
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269 // null appendix, the argument is not passed at all.
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270 //
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271 // The appendix is *not* represented in the signature of the symbolic
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272 // reference for the call site, but (if present) it *is* represented in
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273 // the Method* bound to the site. This means that static and dynamic
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274 // resolution logic needs to make slightly different assessments about the
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275 // number and types of arguments.
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276 void set_method_handle_common(
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277 constantPoolHandle cpool, // holding constant pool (required for locking)
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278 Bytecodes::Code invoke_code, // _invokehandle or _invokedynamic
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279 const CallInfo &call_info // Call link information
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280 );
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281
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282 // invokedynamic and invokehandle call sites have two entries in the
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283 // resolved references array:
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284 // appendix (at index+0)
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285 // MethodType (at index+1)
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286 enum {
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287 _indy_resolved_references_appendix_offset = 0,
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288 _indy_resolved_references_method_type_offset = 1,
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289 _indy_resolved_references_entries
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290 };
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291
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292 Method* method_if_resolved(constantPoolHandle cpool);
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293 oop appendix_if_resolved(constantPoolHandle cpool);
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294 oop method_type_if_resolved(constantPoolHandle cpool);
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295
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296 void set_parameter_size(int value);
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297
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298 // Which bytecode number (1 or 2) in the index field is valid for this bytecode?
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299 // Returns -1 if neither is valid.
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300 static int bytecode_number(Bytecodes::Code code) {
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301 switch (code) {
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302 case Bytecodes::_getstatic : // fall through
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303 case Bytecodes::_getfield : // fall through
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304 case Bytecodes::_invokespecial : // fall through
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305 case Bytecodes::_invokestatic : // fall through
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306 case Bytecodes::_invokehandle : // fall through
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307 case Bytecodes::_invokedynamic : // fall through
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308 case Bytecodes::_invokeinterface : return 1;
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309 case Bytecodes::_putstatic : // fall through
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310 case Bytecodes::_putfield : // fall through
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311 case Bytecodes::_invokevirtual : return 2;
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312 default : break;
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313 }
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314 return -1;
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315 }
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316
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317 // Has this bytecode been resolved? Only valid for invokes and get/put field/static.
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318 bool is_resolved(Bytecodes::Code code) const {
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319 switch (bytecode_number(code)) {
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320 case 1: return (bytecode_1() == code);
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321 case 2: return (bytecode_2() == code);
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322 }
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323 return false; // default: not resolved
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324 }
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325
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326 // Accessors
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327 int indices() const { return _indices; }
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328 int indices_ord() const { return (intx)OrderAccess::load_ptr_acquire(&_indices); }
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329 int constant_pool_index() const { return (indices() & cp_index_mask); }
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330 Bytecodes::Code bytecode_1() const { return Bytecodes::cast((indices_ord() >> bytecode_1_shift) & bytecode_1_mask); }
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331 Bytecodes::Code bytecode_2() const { return Bytecodes::cast((indices_ord() >> bytecode_2_shift) & bytecode_2_mask); }
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332 Metadata* f1_ord() const { return (Metadata *)OrderAccess::load_ptr_acquire(&_f1); }
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333 Method* f1_as_method() const { Metadata* f1 = f1_ord(); assert(f1 == NULL || f1->is_method(), ""); return (Method*)f1; }
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334 Klass* f1_as_klass() const { Metadata* f1 = f1_ord(); assert(f1 == NULL || f1->is_klass(), ""); return (Klass*)f1; }
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335 // Use the accessor f1() to acquire _f1's value. This is needed for
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336 // example in BytecodeInterpreter::run(), where is_f1_null() is
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337 // called to check if an invokedynamic call is resolved. This load
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338 // of _f1 must be ordered with the loads performed by
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339 // cache->main_entry_index().
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340 bool is_f1_null() const { Metadata* f1 = f1_ord(); return f1 == NULL; } // classifies a CPC entry as unbound
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341 int f2_as_index() const { assert(!is_vfinal(), ""); return (int) _f2; }
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342 Method* f2_as_vfinal_method() const { assert(is_vfinal(), ""); return (Method*)_f2; }
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343 int field_index() const { assert(is_field_entry(), ""); return (_flags & field_index_mask); }
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344 int parameter_size() const { assert(is_method_entry(), ""); return (_flags & parameter_size_mask); }
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345 bool is_volatile() const { return (_flags & (1 << is_volatile_shift)) != 0; }
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346 bool is_final() const { return (_flags & (1 << is_final_shift)) != 0; }
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347 bool is_forced_virtual() const { return (_flags & (1 << is_forced_virtual_shift)) != 0; }
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348 bool is_vfinal() const { return (_flags & (1 << is_vfinal_shift)) != 0; }
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349 bool has_appendix() const { return (!is_f1_null()) && (_flags & (1 << has_appendix_shift)) != 0; }
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350 bool has_method_type() const { return (!is_f1_null()) && (_flags & (1 << has_method_type_shift)) != 0; }
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351 bool is_method_entry() const { return (_flags & (1 << is_field_entry_shift)) == 0; }
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352 bool is_field_entry() const { return (_flags & (1 << is_field_entry_shift)) != 0; }
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353 bool is_byte() const { return flag_state() == btos; }
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354 bool is_char() const { return flag_state() == ctos; }
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355 bool is_short() const { return flag_state() == stos; }
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356 bool is_int() const { return flag_state() == itos; }
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357 bool is_long() const { return flag_state() == ltos; }
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358 bool is_float() const { return flag_state() == ftos; }
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359 bool is_double() const { return flag_state() == dtos; }
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360 bool is_object() const { return flag_state() == atos; }
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361 TosState flag_state() const { assert((uint)number_of_states <= (uint)tos_state_mask+1, "");
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362 return (TosState)((_flags >> tos_state_shift) & tos_state_mask); }
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363
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364 // Code generation support
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365 static WordSize size() { return in_WordSize(sizeof(ConstantPoolCacheEntry) / HeapWordSize); }
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366 static ByteSize size_in_bytes() { return in_ByteSize(sizeof(ConstantPoolCacheEntry)); }
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367 static ByteSize indices_offset() { return byte_offset_of(ConstantPoolCacheEntry, _indices); }
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368 static ByteSize f1_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f1); }
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369 static ByteSize f2_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f2); }
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370 static ByteSize flags_offset() { return byte_offset_of(ConstantPoolCacheEntry, _flags); }
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371
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372 #if INCLUDE_JVMTI
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373 // RedefineClasses() API support:
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374 // If this ConstantPoolCacheEntry refers to old_method then update it
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375 // to refer to new_method.
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376 // trace_name_printed is set to true if the current call has
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377 // printed the klass name so that other routines in the adjust_*
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378 // group don't print the klass name.
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379 bool adjust_method_entry(Method* old_method, Method* new_method,
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380 bool * trace_name_printed);
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381 bool check_no_old_or_obsolete_entries();
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382 bool is_interesting_method_entry(Klass* k);
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383 #endif // INCLUDE_JVMTI
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384
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385 // Debugging & Printing
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386 void print (outputStream* st, int index) const;
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387 void verify(outputStream* st) const;
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388
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389 static void verify_tos_state_shift() {
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390 // When shifting flags as a 32-bit int, make sure we don't need an extra mask for tos_state:
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391 assert((((u4)-1 >> tos_state_shift) & ~tos_state_mask) == 0, "no need for tos_state mask");
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392 }
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393 };
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394
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395
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396 // A constant pool cache is a runtime data structure set aside to a constant pool. The cache
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397 // holds interpreter runtime information for all field access and invoke bytecodes. The cache
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398 // is created and initialized before a class is actively used (i.e., initialized), the indivi-
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399 // dual cache entries are filled at resolution (i.e., "link") time (see also: rewriter.*).
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400
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401 class ConstantPoolCache: public MetaspaceObj {
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402 friend class VMStructs;
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403 friend class MetadataFactory;
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404 private:
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405 int _length;
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406 ConstantPool* _constant_pool; // the corresponding constant pool
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407
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408 // Sizing
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409 debug_only(friend class ClassVerifier;)
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410
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411 // Constructor
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412 ConstantPoolCache(int length,
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413 const intStack& inverse_index_map,
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414 const intStack& invokedynamic_inverse_index_map,
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415 const intStack& invokedynamic_references_map) :
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416 _length(length),
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417 _constant_pool(NULL) {
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418 initialize(inverse_index_map, invokedynamic_inverse_index_map,
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419 invokedynamic_references_map);
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420 for (int i = 0; i < length; i++) {
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421 assert(entry_at(i)->is_f1_null(), "Failed to clear?");
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422 }
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423 }
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424
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425 // Initialization
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426 void initialize(const intArray& inverse_index_map,
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427 const intArray& invokedynamic_inverse_index_map,
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428 const intArray& invokedynamic_references_map);
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429 public:
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430 static ConstantPoolCache* allocate(ClassLoaderData* loader_data,
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431 const intStack& cp_cache_map,
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432 const intStack& invokedynamic_cp_cache_map,
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433 const intStack& invokedynamic_references_map, TRAPS);
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434 bool is_constantPoolCache() const { return true; }
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435
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436 int length() const { return _length; }
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437 private:
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438 void set_length(int length) { _length = length; }
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439
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440 static int header_size() { return sizeof(ConstantPoolCache) / HeapWordSize; }
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441 static int size(int length) { return align_object_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); }
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442 public:
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443 int size() const { return size(length()); }
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444 private:
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445
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446 // Helpers
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447 ConstantPool** constant_pool_addr() { return &_constant_pool; }
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448 ConstantPoolCacheEntry* base() const { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); }
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449
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450 friend class constantPoolCacheKlass;
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451 friend class ConstantPoolCacheEntry;
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452
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453 public:
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454 // Accessors
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455 void set_constant_pool(ConstantPool* pool) { _constant_pool = pool; }
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456 ConstantPool* constant_pool() const { return _constant_pool; }
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457 // Fetches the entry at the given index.
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458 // In either case the index must not be encoded or byte-swapped in any way.
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459 ConstantPoolCacheEntry* entry_at(int i) const {
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460 assert(0 <= i && i < length(), "index out of bounds");
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461 return base() + i;
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462 }
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463
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464 // Code generation
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465 static ByteSize base_offset() { return in_ByteSize(sizeof(ConstantPoolCache)); }
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466 static ByteSize entry_offset(int raw_index) {
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467 int index = raw_index;
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468 return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index);
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469 }
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470
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471 #if INCLUDE_JVMTI
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472 // RedefineClasses() API support:
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473 // If any entry of this ConstantPoolCache points to any of
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474 // old_methods, replace it with the corresponding new_method.
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475 // trace_name_printed is set to true if the current call has
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476 // printed the klass name so that other routines in the adjust_*
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477 // group don't print the klass name.
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478 void adjust_method_entries(Method** old_methods, Method** new_methods,
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479 int methods_length, bool * trace_name_printed);
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480 bool check_no_old_or_obsolete_entries();
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481 void dump_cache();
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482 #endif // INCLUDE_JVMTI
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483
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484 // Deallocate - no fields to deallocate
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485 DEBUG_ONLY(bool on_stack() { return false; })
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486 void deallocate_contents(ClassLoaderData* data) {}
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487 bool is_klass() const { return false; }
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488
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489 // Printing
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490 void print_on(outputStream* st) const;
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491 void print_value_on(outputStream* st) const;
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492
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493 const char* internal_name() const { return "{constant pool cache}"; }
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494
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495 // Verify
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496 void verify_on(outputStream* st);
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497 };
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498
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499 #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP