Mercurial > hg > truffle
annotate src/share/vm/oops/constantPool.cpp @ 11787:4fc75b6ca3dd
Introduce NodeWithState for nodes that hold some VirtualState. Use this interface in the required special cases (Scheduling and PEA)
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Wed, 25 Sep 2013 12:08:04 +0200 |
parents | 6b0fd0964b87 |
children | cefad50507d8 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
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26 #include "classfile/classLoaderData.hpp" |
1972 | 27 #include "classfile/javaClasses.hpp" |
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28 #include "classfile/metadataOnStackMark.hpp" |
1972 | 29 #include "classfile/symbolTable.hpp" |
30 #include "classfile/systemDictionary.hpp" | |
31 #include "classfile/vmSymbols.hpp" | |
32 #include "interpreter/linkResolver.hpp" | |
7956 | 33 #include "memory/heapInspection.hpp" |
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34 #include "memory/metadataFactory.hpp" |
1972 | 35 #include "memory/oopFactory.hpp" |
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36 #include "oops/constantPool.hpp" |
1972 | 37 #include "oops/instanceKlass.hpp" |
38 #include "oops/objArrayKlass.hpp" | |
39 #include "runtime/fieldType.hpp" | |
40 #include "runtime/init.hpp" | |
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41 #include "runtime/javaCalls.hpp" |
1972 | 42 #include "runtime/signature.hpp" |
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43 #include "runtime/synchronizer.hpp" |
1972 | 44 #include "runtime/vframe.hpp" |
0 | 45 |
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46 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { |
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47 // Tags are RW but comment below applies to tags also. |
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48 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); |
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49 |
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50 int size = ConstantPool::size(length); |
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51 |
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52 // CDS considerations: |
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53 // Allocate read-write but may be able to move to read-only at dumping time |
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54 // if all the klasses are resolved. The only other field that is writable is |
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55 // the resolved_references array, which is recreated at startup time. |
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56 // But that could be moved to InstanceKlass (although a pain to access from |
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57 // assembly code). Maybe it could be moved to the cpCache which is RW. |
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58 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); |
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59 } |
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60 |
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61 ConstantPool::ConstantPool(Array<u1>* tags) { |
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62 set_length(tags->length()); |
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63 set_tags(NULL); |
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64 set_cache(NULL); |
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65 set_reference_map(NULL); |
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66 set_resolved_references(NULL); |
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67 set_operands(NULL); |
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68 set_pool_holder(NULL); |
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69 set_flags(0); |
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70 |
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71 // only set to non-zero if constant pool is merged by RedefineClasses |
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72 set_version(0); |
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73 |
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74 // initialize tag array |
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75 int length = tags->length(); |
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76 for (int index = 0; index < length; index++) { |
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77 tags->at_put(index, JVM_CONSTANT_Invalid); |
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78 } |
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79 set_tags(tags); |
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80 } |
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81 |
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82 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { |
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83 MetadataFactory::free_metadata(loader_data, cache()); |
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84 set_cache(NULL); |
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85 MetadataFactory::free_array<jushort>(loader_data, operands()); |
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86 set_operands(NULL); |
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87 |
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88 release_C_heap_structures(); |
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89 |
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90 // free tag array |
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91 MetadataFactory::free_array<u1>(loader_data, tags()); |
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92 set_tags(NULL); |
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93 } |
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94 |
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95 void ConstantPool::release_C_heap_structures() { |
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96 // walk constant pool and decrement symbol reference counts |
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97 unreference_symbols(); |
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98 } |
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99 |
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100 objArrayOop ConstantPool::resolved_references() const { |
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101 return (objArrayOop)JNIHandles::resolve(_resolved_references); |
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102 } |
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103 |
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104 // Create resolved_references array and mapping array for original cp indexes |
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105 // The ldc bytecode was rewritten to have the resolved reference array index so need a way |
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106 // to map it back for resolving and some unlikely miscellaneous uses. |
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107 // The objects created by invokedynamic are appended to this list. |
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108 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, |
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109 intStack reference_map, |
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110 int constant_pool_map_length, |
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111 TRAPS) { |
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112 // Initialized the resolved object cache. |
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113 int map_length = reference_map.length(); |
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114 if (map_length > 0) { |
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115 // Only need mapping back to constant pool entries. The map isn't used for |
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116 // invokedynamic resolved_reference entries. The constant pool cache index |
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117 // has the mapping back to both the constant pool and to the resolved |
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118 // reference index. |
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119 if (constant_pool_map_length > 0) { |
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120 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, map_length, CHECK); |
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121 |
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122 for (int i = 0; i < constant_pool_map_length; i++) { |
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123 int x = reference_map.at(i); |
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124 assert(x == (int)(jushort) x, "klass index is too big"); |
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125 om->at_put(i, (jushort)x); |
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126 } |
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127 set_reference_map(om); |
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128 } |
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129 |
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130 // Create Java array for holding resolved strings, methodHandles, |
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131 // methodTypes, invokedynamic and invokehandle appendix objects, etc. |
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132 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); |
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133 Handle refs_handle (THREAD, (oop)stom); // must handleize. |
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134 set_resolved_references(loader_data->add_handle(refs_handle)); |
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135 } |
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136 } |
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137 |
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138 // CDS support. Create a new resolved_references array. |
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139 void ConstantPool::restore_unshareable_info(TRAPS) { |
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140 |
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141 // restore the C++ vtable from the shared archive |
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142 restore_vtable(); |
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143 |
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144 if (SystemDictionary::Object_klass_loaded()) { |
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145 // Recreate the object array and add to ClassLoaderData. |
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146 int map_length = resolved_reference_length(); |
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147 if (map_length > 0) { |
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148 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); |
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149 Handle refs_handle (THREAD, (oop)stom); // must handleize. |
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150 |
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151 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
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152 set_resolved_references(loader_data->add_handle(refs_handle)); |
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153 } |
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154 } |
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155 } |
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156 |
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157 void ConstantPool::remove_unshareable_info() { |
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158 // Resolved references are not in the shared archive. |
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159 // Save the length for restoration. It is not necessarily the same length |
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160 // as reference_map.length() if invokedynamic is saved. |
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161 set_resolved_reference_length( |
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162 resolved_references() != NULL ? resolved_references()->length() : 0); |
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163 set_resolved_references(NULL); |
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164 } |
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165 |
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166 oop ConstantPool::lock() { |
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167 if (_pool_holder) { |
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168 // We re-use the _pool_holder's init_lock to reduce footprint. |
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169 // Notes on deadlocks: |
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170 // [1] This lock is a Java oop, so it can be recursively locked by |
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171 // the same thread without self-deadlocks. |
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172 // [2] Deadlock will happen if there is circular dependency between |
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173 // the <clinit> of two Java classes. However, in this case, |
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174 // the deadlock would have happened long before we reach |
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175 // ConstantPool::lock(), so reusing init_lock does not |
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176 // increase the possibility of deadlock. |
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177 return _pool_holder->init_lock(); |
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178 } else { |
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179 return NULL; |
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180 } |
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181 } |
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182 |
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183 int ConstantPool::cp_to_object_index(int cp_index) { |
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184 // this is harder don't do this so much. |
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185 for (int i = 0; i< reference_map()->length(); i++) { |
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186 if (reference_map()->at(i) == cp_index) return i; |
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187 // Zero entry is divider between constant pool indices for strings, |
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188 // method handles and method types. After that the index is a constant |
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189 // pool cache index for invokedynamic. Stop when zero (which can never |
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190 // be a constant pool index) |
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191 if (reference_map()->at(i) == 0) break; |
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192 } |
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193 // We might not find the index. |
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194 return _no_index_sentinel; |
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195 } |
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196 |
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197 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) { |
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198 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
0 | 199 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and |
200 // tag is not updated atomicly. | |
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201 |
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202 CPSlot entry = this_oop->slot_at(which); |
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203 if (entry.is_resolved()) { |
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204 assert(entry.get_klass()->is_klass(), "must be"); |
0 | 205 // Already resolved - return entry. |
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206 return entry.get_klass(); |
0 | 207 } |
208 | |
209 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object | |
210 // already has updated the object | |
211 assert(THREAD->is_Java_thread(), "must be a Java thread"); | |
212 bool do_resolve = false; | |
213 bool in_error = false; | |
214 | |
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215 // Create a handle for the mirror. This will preserve the resolved class |
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216 // until the loader_data is registered. |
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217 Handle mirror_handle; |
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218 |
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219 Symbol* name = NULL; |
0 | 220 Handle loader; |
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221 { |
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222 oop cplock = this_oop->lock(); |
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223 ObjectLocker ol(cplock , THREAD, cplock != NULL); |
0 | 224 |
225 if (this_oop->tag_at(which).is_unresolved_klass()) { | |
226 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
227 in_error = true; | |
228 } else { | |
229 do_resolve = true; | |
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230 name = this_oop->unresolved_klass_at(which); |
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231 loader = Handle(THREAD, this_oop->pool_holder()->class_loader()); |
0 | 232 } |
233 } | |
234 } // unlocking constantPool | |
235 | |
236 | |
237 // The original attempt to resolve this constant pool entry failed so find the | |
238 // original error and throw it again (JVMS 5.4.3). | |
239 if (in_error) { | |
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240 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which); |
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241 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); |
0 | 242 ResourceMark rm; |
243 // exception text will be the class name | |
244 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
245 THROW_MSG_0(error, className); | |
246 } | |
247 | |
248 if (do_resolve) { | |
249 // this_oop must be unlocked during resolve_or_fail | |
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250 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 251 Handle h_prot (THREAD, protection_domain); |
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252 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD); |
0 | 253 KlassHandle k; |
254 if (!HAS_PENDING_EXCEPTION) { | |
255 k = KlassHandle(THREAD, k_oop); | |
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256 // preserve the resolved klass. |
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257 mirror_handle = Handle(THREAD, k_oop->java_mirror()); |
0 | 258 // Do access check for klasses |
259 verify_constant_pool_resolve(this_oop, k, THREAD); | |
260 } | |
261 | |
262 // Failed to resolve class. We must record the errors so that subsequent attempts | |
263 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). | |
264 if (HAS_PENDING_EXCEPTION) { | |
265 ResourceMark rm; | |
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266 Symbol* error = PENDING_EXCEPTION->klass()->name(); |
0 | 267 |
268 bool throw_orig_error = false; | |
269 { | |
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270 oop cplock = this_oop->lock(); |
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271 ObjectLocker ol(cplock, THREAD, cplock != NULL); |
0 | 272 |
273 // some other thread has beaten us and has resolved the class. | |
274 if (this_oop->tag_at(which).is_klass()) { | |
275 CLEAR_PENDING_EXCEPTION; | |
276 entry = this_oop->resolved_klass_at(which); | |
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277 return entry.get_klass(); |
0 | 278 } |
279 | |
280 if (!PENDING_EXCEPTION-> | |
1142 | 281 is_a(SystemDictionary::LinkageError_klass())) { |
0 | 282 // Just throw the exception and don't prevent these classes from |
283 // being loaded due to virtual machine errors like StackOverflow | |
284 // and OutOfMemoryError, etc, or if the thread was hit by stop() | |
285 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) | |
286 } | |
287 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
288 SystemDictionary::add_resolution_error(this_oop, which, error); | |
289 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError); | |
290 } else { | |
291 // some other thread has put the class in error state. | |
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292 error = SystemDictionary::find_resolution_error(this_oop, which); |
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293 assert(error != NULL, "checking"); |
0 | 294 throw_orig_error = true; |
295 } | |
296 } // unlocked | |
297 | |
298 if (throw_orig_error) { | |
299 CLEAR_PENDING_EXCEPTION; | |
300 ResourceMark rm; | |
301 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
302 THROW_MSG_0(error, className); | |
303 } | |
304 | |
305 return 0; | |
306 } | |
307 | |
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308 if (TraceClassResolution && !k()->oop_is_array()) { |
0 | 309 // skip resolving the constant pool so that this code get's |
310 // called the next time some bytecodes refer to this class. | |
311 ResourceMark rm; | |
312 int line_number = -1; | |
313 const char * source_file = NULL; | |
314 if (JavaThread::current()->has_last_Java_frame()) { | |
315 // try to identify the method which called this function. | |
316 vframeStream vfst(JavaThread::current()); | |
317 if (!vfst.at_end()) { | |
318 line_number = vfst.method()->line_number_from_bci(vfst.bci()); | |
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319 Symbol* s = vfst.method()->method_holder()->source_file_name(); |
0 | 320 if (s != NULL) { |
321 source_file = s->as_C_string(); | |
322 } | |
323 } | |
324 } | |
325 if (k() != this_oop->pool_holder()) { | |
326 // only print something if the classes are different | |
327 if (source_file != NULL) { | |
328 tty->print("RESOLVE %s %s %s:%d\n", | |
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329 this_oop->pool_holder()->external_name(), |
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330 InstanceKlass::cast(k())->external_name(), source_file, line_number); |
0 | 331 } else { |
332 tty->print("RESOLVE %s %s\n", | |
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333 this_oop->pool_holder()->external_name(), |
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334 InstanceKlass::cast(k())->external_name()); |
0 | 335 } |
336 } | |
337 return k(); | |
338 } else { | |
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339 oop cplock = this_oop->lock(); |
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340 ObjectLocker ol(cplock, THREAD, cplock != NULL); |
0 | 341 // Only updated constant pool - if it is resolved. |
342 do_resolve = this_oop->tag_at(which).is_unresolved_klass(); | |
343 if (do_resolve) { | |
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344 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data(); |
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345 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM |
0 | 346 this_oop->klass_at_put(which, k()); |
347 } | |
348 } | |
349 } | |
350 | |
351 entry = this_oop->resolved_klass_at(which); | |
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352 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); |
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353 return entry.get_klass(); |
0 | 354 } |
355 | |
356 | |
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357 // Does not update ConstantPool* - to avoid any exception throwing. Used |
0 | 358 // by compiler and exception handling. Also used to avoid classloads for |
359 // instanceof operations. Returns NULL if the class has not been loaded or | |
360 // if the verification of constant pool failed | |
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361 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) { |
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362 CPSlot entry = this_oop->slot_at(which); |
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363 if (entry.is_resolved()) { |
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364 assert(entry.get_klass()->is_klass(), "must be"); |
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365 return entry.get_klass(); |
0 | 366 } else { |
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367 assert(entry.is_unresolved(), "must be either symbol or klass"); |
0 | 368 Thread *thread = Thread::current(); |
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369 Symbol* name = entry.get_symbol(); |
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370 oop loader = this_oop->pool_holder()->class_loader(); |
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371 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 372 Handle h_prot (thread, protection_domain); |
373 Handle h_loader (thread, loader); | |
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374 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); |
0 | 375 |
376 if (k != NULL) { | |
377 // Make sure that resolving is legal | |
378 EXCEPTION_MARK; | |
379 KlassHandle klass(THREAD, k); | |
380 // return NULL if verification fails | |
381 verify_constant_pool_resolve(this_oop, klass, THREAD); | |
382 if (HAS_PENDING_EXCEPTION) { | |
383 CLEAR_PENDING_EXCEPTION; | |
384 return NULL; | |
385 } | |
386 return klass(); | |
387 } else { | |
388 return k; | |
389 } | |
390 } | |
391 } | |
392 | |
393 | |
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394 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) { |
0 | 395 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which)); |
396 } | |
397 | |
398 | |
399 // This is an interface for the compiler that allows accessing non-resolved entries | |
400 // in the constant pool - but still performs the validations tests. Must be used | |
401 // in a pre-parse of the compiler - to determine what it can do and not do. | |
402 // Note: We cannot update the ConstantPool from the vm_thread. | |
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403 Klass* ConstantPool::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) { |
0 | 404 int which = this_oop->klass_ref_index_at(index); |
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405 CPSlot entry = this_oop->slot_at(which); |
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406 if (entry.is_resolved()) { |
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407 assert(entry.get_klass()->is_klass(), "must be"); |
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408 return entry.get_klass(); |
0 | 409 } else { |
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410 assert(entry.is_unresolved(), "must be either symbol or klass"); |
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411 Symbol* name = entry.get_symbol(); |
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412 oop loader = this_oop->pool_holder()->class_loader(); |
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413 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 414 Handle h_loader(THREAD, loader); |
415 Handle h_prot (THREAD, protection_domain); | |
416 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD)); | |
417 | |
418 // Do access check for klasses | |
419 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL); | |
420 return k(); | |
421 } | |
422 } | |
423 | |
424 | |
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425 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool, |
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426 int which) { |
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427 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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428 int cache_index = decode_cpcache_index(which, true); |
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429 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { |
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430 // FIXME: should be an assert |
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431 if (PrintMiscellaneous && (Verbose||WizardMode)) { |
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432 tty->print_cr("bad operand %d in:", which); cpool->print(); |
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433 } |
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434 return NULL; |
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435 } |
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436 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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437 return e->method_if_resolved(cpool); |
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438 } |
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439 |
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440 |
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441 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) { |
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442 if (cpool->cache() == NULL) return false; // nothing to load yet |
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443 int cache_index = decode_cpcache_index(which, true); |
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444 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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445 return e->has_appendix(); |
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446 } |
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447 |
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448 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) { |
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449 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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450 int cache_index = decode_cpcache_index(which, true); |
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451 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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452 return e->appendix_if_resolved(cpool); |
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453 } |
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454 |
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455 |
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456 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) { |
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457 if (cpool->cache() == NULL) return false; // nothing to load yet |
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458 int cache_index = decode_cpcache_index(which, true); |
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459 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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460 return e->has_method_type(); |
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461 } |
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462 |
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463 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) { |
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464 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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465 int cache_index = decode_cpcache_index(which, true); |
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466 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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467 return e->method_type_if_resolved(cpool); |
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468 } |
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469 |
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470 |
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471 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { |
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472 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
0 | 473 return symbol_at(name_index); |
474 } | |
475 | |
476 | |
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477 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { |
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478 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
0 | 479 return symbol_at(signature_index); |
480 } | |
481 | |
482 | |
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483 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { |
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484 int i = which; |
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485 if (!uncached && cache() != NULL) { |
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486 if (ConstantPool::is_invokedynamic_index(which)) { |
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487 // Invokedynamic index is index into resolved_references |
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488 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); |
2460 | 489 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); |
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490 assert(tag_at(pool_index).is_name_and_type(), ""); |
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491 return pool_index; |
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492 } |
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493 // change byte-ordering and go via cache |
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494 i = remap_instruction_operand_from_cache(which); |
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495 } else { |
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496 if (tag_at(which).is_invoke_dynamic()) { |
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497 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); |
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498 assert(tag_at(pool_index).is_name_and_type(), ""); |
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499 return pool_index; |
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500 } |
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501 } |
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502 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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503 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); |
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504 jint ref_index = *int_at_addr(i); |
0 | 505 return extract_high_short_from_int(ref_index); |
506 } | |
507 | |
508 | |
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509 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { |
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510 guarantee(!ConstantPool::is_invokedynamic_index(which), |
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511 "an invokedynamic instruction does not have a klass"); |
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512 int i = which; |
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513 if (!uncached && cache() != NULL) { |
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514 // change byte-ordering and go via cache |
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515 i = remap_instruction_operand_from_cache(which); |
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516 } |
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517 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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518 jint ref_index = *int_at_addr(i); |
0 | 519 return extract_low_short_from_int(ref_index); |
520 } | |
521 | |
522 | |
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523 |
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524 int ConstantPool::remap_instruction_operand_from_cache(int operand) { |
1565 | 525 int cpc_index = operand; |
526 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); | |
527 assert((int)(u2)cpc_index == cpc_index, "clean u2"); | |
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528 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); |
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529 return member_index; |
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530 } |
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531 |
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532 |
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533 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) { |
0 | 534 if (k->oop_is_instance() || k->oop_is_objArray()) { |
535 instanceKlassHandle holder (THREAD, this_oop->pool_holder()); | |
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536 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); |
0 | 537 KlassHandle element (THREAD, elem_oop); |
538 | |
539 // The element type could be a typeArray - we only need the access check if it is | |
540 // an reference to another class | |
541 if (element->oop_is_instance()) { | |
542 LinkResolver::check_klass_accessability(holder, element, CHECK); | |
543 } | |
544 } | |
545 } | |
546 | |
547 | |
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548 int ConstantPool::name_ref_index_at(int which_nt) { |
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549 jint ref_index = name_and_type_at(which_nt); |
0 | 550 return extract_low_short_from_int(ref_index); |
551 } | |
552 | |
553 | |
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554 int ConstantPool::signature_ref_index_at(int which_nt) { |
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555 jint ref_index = name_and_type_at(which_nt); |
0 | 556 return extract_high_short_from_int(ref_index); |
557 } | |
558 | |
559 | |
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560 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { |
0 | 561 return klass_at(klass_ref_index_at(which), CHECK_NULL); |
562 } | |
563 | |
564 | |
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565 Symbol* ConstantPool::klass_name_at(int which) { |
0 | 566 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), |
567 "Corrupted constant pool"); | |
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568 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
0 | 569 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and |
570 // tag is not updated atomicly. | |
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571 CPSlot entry = slot_at(which); |
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572 if (entry.is_resolved()) { |
0 | 573 // Already resolved - return entry's name. |
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574 assert(entry.get_klass()->is_klass(), "must be"); |
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575 return entry.get_klass()->name(); |
0 | 576 } else { |
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577 assert(entry.is_unresolved(), "must be either symbol or klass"); |
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578 return entry.get_symbol(); |
0 | 579 } |
580 } | |
581 | |
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582 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { |
0 | 583 jint ref_index = klass_ref_index_at(which); |
584 return klass_at_noresolve(ref_index); | |
585 } | |
586 | |
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587 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { |
1602 | 588 jint ref_index = uncached_klass_ref_index_at(which); |
589 return klass_at_noresolve(ref_index); | |
590 } | |
591 | |
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592 char* ConstantPool::string_at_noresolve(int which) { |
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593 Symbol* s = unresolved_string_at(which); |
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594 if (s == NULL) { |
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595 return (char*)"<pseudo-string>"; |
0 | 596 } else { |
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597 return unresolved_string_at(which)->as_C_string(); |
0 | 598 } |
599 } | |
600 | |
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601 BasicType ConstantPool::basic_type_for_signature_at(int which) { |
0 | 602 return FieldType::basic_type(symbol_at(which)); |
603 } | |
604 | |
605 | |
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606 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) { |
0 | 607 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused |
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608 if (this_oop->tag_at(index).is_string()) { |
0 | 609 this_oop->string_at(index, CHECK); |
610 } | |
611 } | |
612 } | |
613 | |
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614 // Resolve all the classes in the constant pool. If they are all resolved, |
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615 // the constant pool is read-only. Enhancement: allocate cp entries to |
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616 // another metaspace, and copy to read-only or read-write space if this |
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617 // bit is set. |
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618 bool ConstantPool::resolve_class_constants(TRAPS) { |
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619 constantPoolHandle cp(THREAD, this); |
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620 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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621 if (tag_at(index).is_unresolved_klass() && |
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622 klass_at_if_loaded(cp, index) == NULL) { |
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623 return false; |
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624 } |
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625 } |
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626 // set_preresolution(); or some bit for future use |
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627 return true; |
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628 } |
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629 |
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630 // If resolution for MethodHandle or MethodType fails, save the exception |
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631 // in the resolution error table, so that the same exception is thrown again. |
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632 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which, |
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633 int tag, TRAPS) { |
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634 ResourceMark rm; |
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635 Symbol* error = PENDING_EXCEPTION->klass()->name(); |
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636 oop cplock = this_oop->lock(); |
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637 ObjectLocker ol(cplock, THREAD, cplock != NULL); // lock cpool to change tag. |
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638 |
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639 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ? |
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640 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError; |
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641 |
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642 if (!PENDING_EXCEPTION-> |
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643 is_a(SystemDictionary::LinkageError_klass())) { |
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644 // Just throw the exception and don't prevent these classes from |
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645 // being loaded due to virtual machine errors like StackOverflow |
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646 // and OutOfMemoryError, etc, or if the thread was hit by stop() |
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647 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) |
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648 |
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649 } else if (this_oop->tag_at(which).value() != error_tag) { |
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650 SystemDictionary::add_resolution_error(this_oop, which, error); |
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651 this_oop->tag_at_put(which, error_tag); |
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652 } else { |
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653 // some other thread has put the class in error state. |
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654 error = SystemDictionary::find_resolution_error(this_oop, which); |
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655 assert(error != NULL, "checking"); |
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656 CLEAR_PENDING_EXCEPTION; |
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657 THROW_MSG(error, ""); |
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658 } |
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659 } |
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660 |
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661 |
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662 // Called to resolve constants in the constant pool and return an oop. |
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663 // Some constant pool entries cache their resolved oop. This is also |
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664 // called to create oops from constants to use in arguments for invokedynamic |
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665 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) { |
1602 | 666 oop result_oop = NULL; |
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667 Handle throw_exception; |
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668 |
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669 if (cache_index == _possible_index_sentinel) { |
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670 // It is possible that this constant is one which is cached in the objects. |
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671 // We'll do a linear search. This should be OK because this usage is rare. |
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672 assert(index > 0, "valid index"); |
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673 cache_index = this_oop->cp_to_object_index(index); |
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674 } |
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675 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); |
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676 assert(index == _no_index_sentinel || index >= 0, ""); |
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677 |
1602 | 678 if (cache_index >= 0) { |
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679 result_oop = this_oop->resolved_references()->obj_at(cache_index); |
1602 | 680 if (result_oop != NULL) { |
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681 return result_oop; |
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682 // That was easy... |
1602 | 683 } |
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684 index = this_oop->object_to_cp_index(cache_index); |
1602 | 685 } |
686 | |
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687 jvalue prim_value; // temp used only in a few cases below |
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688 |
1602 | 689 int tag_value = this_oop->tag_at(index).value(); |
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690 |
1602 | 691 switch (tag_value) { |
692 | |
693 case JVM_CONSTANT_UnresolvedClass: | |
694 case JVM_CONSTANT_UnresolvedClassInError: | |
695 case JVM_CONSTANT_Class: | |
696 { | |
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697 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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698 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL); |
1602 | 699 // ldc wants the java mirror. |
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700 result_oop = resolved->java_mirror(); |
1602 | 701 break; |
702 } | |
703 | |
704 case JVM_CONSTANT_String: | |
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705 assert(cache_index != _no_index_sentinel, "should have been set"); |
1602 | 706 if (this_oop->is_pseudo_string_at(index)) { |
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707 result_oop = this_oop->pseudo_string_at(index, cache_index); |
1602 | 708 break; |
709 } | |
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710 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL); |
1602 | 711 break; |
712 | |
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713 case JVM_CONSTANT_MethodHandleInError: |
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714 case JVM_CONSTANT_MethodTypeInError: |
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715 { |
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716 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index); |
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717 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); |
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718 ResourceMark rm; |
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719 THROW_MSG_0(error, ""); |
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720 break; |
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721 } |
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722 |
1602 | 723 case JVM_CONSTANT_MethodHandle: |
724 { | |
725 int ref_kind = this_oop->method_handle_ref_kind_at(index); | |
726 int callee_index = this_oop->method_handle_klass_index_at(index); | |
2177
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727 Symbol* name = this_oop->method_handle_name_ref_at(index); |
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728 Symbol* signature = this_oop->method_handle_signature_ref_at(index); |
1602 | 729 if (PrintMiscellaneous) |
730 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", | |
731 ref_kind, index, this_oop->method_handle_index_at(index), | |
732 callee_index, name->as_C_string(), signature->as_C_string()); | |
733 KlassHandle callee; | |
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734 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL); |
1602 | 735 callee = KlassHandle(THREAD, k); |
736 } | |
737 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
738 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, | |
739 callee, name, signature, | |
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740 THREAD); |
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741 result_oop = value(); |
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742 if (HAS_PENDING_EXCEPTION) { |
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743 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); |
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744 } |
1602 | 745 break; |
746 } | |
747 | |
748 case JVM_CONSTANT_MethodType: | |
749 { | |
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750 Symbol* signature = this_oop->method_type_signature_at(index); |
1602 | 751 if (PrintMiscellaneous) |
752 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", | |
753 index, this_oop->method_type_index_at(index), | |
754 signature->as_C_string()); | |
755 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
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756 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); |
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757 result_oop = value(); |
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758 if (HAS_PENDING_EXCEPTION) { |
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759 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); |
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760 } |
1602 | 761 break; |
762 } | |
763 | |
764 case JVM_CONSTANT_Integer: | |
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765 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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766 prim_value.i = this_oop->int_at(index); |
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767 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); |
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768 break; |
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769 |
1602 | 770 case JVM_CONSTANT_Float: |
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771 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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772 prim_value.f = this_oop->float_at(index); |
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773 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); |
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774 break; |
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775 |
1602 | 776 case JVM_CONSTANT_Long: |
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777 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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778 prim_value.j = this_oop->long_at(index); |
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779 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); |
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780 break; |
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781 |
1602 | 782 case JVM_CONSTANT_Double: |
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783 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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784 prim_value.d = this_oop->double_at(index); |
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785 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); |
1602 | 786 break; |
787 | |
788 default: | |
789 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", | |
790 this_oop(), index, cache_index, tag_value) ); | |
791 assert(false, "unexpected constant tag"); | |
792 break; | |
793 } | |
794 | |
795 if (cache_index >= 0) { | |
796 // Cache the oop here also. | |
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797 Handle result_handle(THREAD, result_oop); |
10152
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798 oop cplock = this_oop->lock(); |
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799 ObjectLocker ol(cplock, THREAD, cplock != NULL); // don't know if we really need this |
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800 oop result = this_oop->resolved_references()->obj_at(cache_index); |
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801 // Benign race condition: resolved_references may already be filled in while we were trying to lock. |
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802 // The important thing here is that all threads pick up the same result. |
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803 // It doesn't matter which racing thread wins, as long as only one |
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804 // result is used by all threads, and all future queries. |
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805 // That result may be either a resolved constant or a failure exception. |
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806 if (result == NULL) { |
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807 this_oop->resolved_references()->obj_at_put(cache_index, result_handle()); |
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808 return result_handle(); |
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809 } else { |
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810 // Return the winning thread's result. This can be different than |
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811 // result_handle() for MethodHandles. |
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812 return result; |
1602 | 813 } |
814 } else { | |
815 return result_oop; | |
816 } | |
817 } | |
818 | |
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819 oop ConstantPool::uncached_string_at(int which, TRAPS) { |
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820 Symbol* sym = unresolved_string_at(which); |
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821 oop str = StringTable::intern(sym, CHECK_(NULL)); |
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822 assert(java_lang_String::is_instance(str), "must be string"); |
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823 return str; |
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824 } |
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825 |
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826 |
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827 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) { |
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828 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); |
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829 |
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830 Handle bsm; |
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831 int argc; |
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832 { |
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833 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments |
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834 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. |
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835 // It is accompanied by the optional arguments. |
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836 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index); |
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837 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); |
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838 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { |
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839 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); |
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840 } |
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841 |
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842 // Extract the optional static arguments. |
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843 argc = this_oop->invoke_dynamic_argument_count_at(index); |
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844 if (argc == 0) return bsm_oop; |
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845 |
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846 bsm = Handle(THREAD, bsm_oop); |
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847 } |
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848 |
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849 objArrayHandle info; |
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850 { |
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851 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); |
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852 info = objArrayHandle(THREAD, info_oop); |
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853 } |
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854 |
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855 info->obj_at_put(0, bsm()); |
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856 for (int i = 0; i < argc; i++) { |
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857 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i); |
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858 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); |
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859 info->obj_at_put(1+i, arg_oop); |
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860 } |
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861 |
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862 return info(); |
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863 } |
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864 |
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865 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) { |
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866 // If the string has already been interned, this entry will be non-null |
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867 oop str = this_oop->resolved_references()->obj_at(obj_index); |
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868 if (str != NULL) return str; |
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869 |
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870 Symbol* sym = this_oop->unresolved_string_at(which); |
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871 str = StringTable::intern(sym, CHECK_(NULL)); |
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872 this_oop->string_at_put(which, obj_index, str); |
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873 assert(java_lang_String::is_instance(str), "must be string"); |
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874 return str; |
0 | 875 } |
876 | |
877 | |
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878 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, |
0 | 879 int which) { |
2177
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880 // Names are interned, so we can compare Symbol*s directly |
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881 Symbol* cp_name = klass_name_at(which); |
0 | 882 return (cp_name == k->name()); |
883 } | |
884 | |
885 | |
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886 // Iterate over symbols and decrement ones which are Symbol*s. |
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887 // This is done during GC so do not need to lock constantPool unless we |
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888 // have per-thread safepoints. |
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889 // Only decrement the UTF8 symbols. Unresolved classes and strings point to |
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890 // these symbols but didn't increment the reference count. |
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891 void ConstantPool::unreference_symbols() { |
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892 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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893 constantTag tag = tag_at(index); |
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894 if (tag.is_symbol()) { |
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895 symbol_at(index)->decrement_refcount(); |
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896 } |
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897 } |
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898 } |
0 | 899 |
900 | |
901 // Compare this constant pool's entry at index1 to the constant pool | |
902 // cp2's entry at index2. | |
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903 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2, |
0 | 904 int index2, TRAPS) { |
905 | |
906 jbyte t1 = tag_at(index1).value(); | |
907 jbyte t2 = cp2->tag_at(index2).value(); | |
908 | |
909 | |
910 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass | |
911 // when comparing | |
912 if (t1 == JVM_CONSTANT_UnresolvedClassInError) { | |
913 t1 = JVM_CONSTANT_UnresolvedClass; | |
914 } | |
915 if (t2 == JVM_CONSTANT_UnresolvedClassInError) { | |
916 t2 = JVM_CONSTANT_UnresolvedClass; | |
917 } | |
918 | |
919 if (t1 != t2) { | |
920 // Not the same entry type so there is nothing else to check. Note | |
921 // that this style of checking will consider resolved/unresolved | |
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922 // class pairs as different. |
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923 // From the ConstantPool* API point of view, this is correct |
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924 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this |
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925 // plays out in the context of ConstantPool* merging. |
0 | 926 return false; |
927 } | |
928 | |
929 switch (t1) { | |
930 case JVM_CONSTANT_Class: | |
931 { | |
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932 Klass* k1 = klass_at(index1, CHECK_false); |
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933 Klass* k2 = cp2->klass_at(index2, CHECK_false); |
0 | 934 if (k1 == k2) { |
935 return true; | |
936 } | |
937 } break; | |
938 | |
939 case JVM_CONSTANT_ClassIndex: | |
940 { | |
941 int recur1 = klass_index_at(index1); | |
942 int recur2 = cp2->klass_index_at(index2); | |
943 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
944 if (match) { | |
945 return true; | |
946 } | |
947 } break; | |
948 | |
949 case JVM_CONSTANT_Double: | |
950 { | |
951 jdouble d1 = double_at(index1); | |
952 jdouble d2 = cp2->double_at(index2); | |
953 if (d1 == d2) { | |
954 return true; | |
955 } | |
956 } break; | |
957 | |
958 case JVM_CONSTANT_Fieldref: | |
959 case JVM_CONSTANT_InterfaceMethodref: | |
960 case JVM_CONSTANT_Methodref: | |
961 { | |
962 int recur1 = uncached_klass_ref_index_at(index1); | |
963 int recur2 = cp2->uncached_klass_ref_index_at(index2); | |
964 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
965 if (match) { | |
966 recur1 = uncached_name_and_type_ref_index_at(index1); | |
967 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); | |
968 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
969 if (match) { | |
970 return true; | |
971 } | |
972 } | |
973 } break; | |
974 | |
975 case JVM_CONSTANT_Float: | |
976 { | |
977 jfloat f1 = float_at(index1); | |
978 jfloat f2 = cp2->float_at(index2); | |
979 if (f1 == f2) { | |
980 return true; | |
981 } | |
982 } break; | |
983 | |
984 case JVM_CONSTANT_Integer: | |
985 { | |
986 jint i1 = int_at(index1); | |
987 jint i2 = cp2->int_at(index2); | |
988 if (i1 == i2) { | |
989 return true; | |
990 } | |
991 } break; | |
992 | |
993 case JVM_CONSTANT_Long: | |
994 { | |
995 jlong l1 = long_at(index1); | |
996 jlong l2 = cp2->long_at(index2); | |
997 if (l1 == l2) { | |
998 return true; | |
999 } | |
1000 } break; | |
1001 | |
1002 case JVM_CONSTANT_NameAndType: | |
1003 { | |
1004 int recur1 = name_ref_index_at(index1); | |
1005 int recur2 = cp2->name_ref_index_at(index2); | |
1006 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
1007 if (match) { | |
1008 recur1 = signature_ref_index_at(index1); | |
1009 recur2 = cp2->signature_ref_index_at(index2); | |
1010 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
1011 if (match) { | |
1012 return true; | |
1013 } | |
1014 } | |
1015 } break; | |
1016 | |
1017 case JVM_CONSTANT_StringIndex: | |
1018 { | |
1019 int recur1 = string_index_at(index1); | |
1020 int recur2 = cp2->string_index_at(index2); | |
1021 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
1022 if (match) { | |
1023 return true; | |
1024 } | |
1025 } break; | |
1026 | |
1027 case JVM_CONSTANT_UnresolvedClass: | |
1028 { | |
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1029 Symbol* k1 = unresolved_klass_at(index1); |
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1030 Symbol* k2 = cp2->unresolved_klass_at(index2); |
0 | 1031 if (k1 == k2) { |
1032 return true; | |
1033 } | |
1034 } break; | |
1035 | |
1602 | 1036 case JVM_CONSTANT_MethodType: |
1037 { | |
1038 int k1 = method_type_index_at(index1); | |
1039 int k2 = cp2->method_type_index_at(index2); | |
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1040 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1041 if (match) { |
1602 | 1042 return true; |
1043 } | |
1044 } break; | |
1045 | |
1046 case JVM_CONSTANT_MethodHandle: | |
1047 { | |
1048 int k1 = method_handle_ref_kind_at(index1); | |
1049 int k2 = cp2->method_handle_ref_kind_at(index2); | |
1050 if (k1 == k2) { | |
1051 int i1 = method_handle_index_at(index1); | |
1052 int i2 = cp2->method_handle_index_at(index2); | |
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1053 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); |
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1054 if (match) { |
1602 | 1055 return true; |
1056 } | |
1057 } | |
1058 } break; | |
1059 | |
1660
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1060 case JVM_CONSTANT_InvokeDynamic: |
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1061 { |
10151
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1062 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); |
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1063 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); |
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1064 int i1 = invoke_dynamic_bootstrap_specifier_index(index1); |
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1065 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); |
10350 | 1066 // separate statements and variables because CHECK_false is used |
1067 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); | |
1068 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); | |
1069 return (match_entry && match_operand); | |
1660
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1070 } break; |
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1071 |
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1072 case JVM_CONSTANT_String: |
0 | 1073 { |
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1074 Symbol* s1 = unresolved_string_at(index1); |
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1075 Symbol* s2 = cp2->unresolved_string_at(index2); |
0 | 1076 if (s1 == s2) { |
1077 return true; | |
1078 } | |
1079 } break; | |
1080 | |
1081 case JVM_CONSTANT_Utf8: | |
1082 { | |
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1083 Symbol* s1 = symbol_at(index1); |
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1084 Symbol* s2 = cp2->symbol_at(index2); |
0 | 1085 if (s1 == s2) { |
1086 return true; | |
1087 } | |
1088 } break; | |
1089 | |
1090 // Invalid is used as the tag for the second constant pool entry | |
1091 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1092 // not be seen by itself. | |
1093 case JVM_CONSTANT_Invalid: // fall through | |
1094 | |
1095 default: | |
1096 ShouldNotReachHere(); | |
1097 break; | |
1098 } | |
1099 | |
1100 return false; | |
1101 } // end compare_entry_to() | |
1102 | |
1103 | |
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1104 // Resize the operands array with delta_len and delta_size. |
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1105 // Used in RedefineClasses for CP merge. |
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1106 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { |
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1107 int old_len = operand_array_length(operands()); |
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1108 int new_len = old_len + delta_len; |
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1109 int min_len = (delta_len > 0) ? old_len : new_len; |
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1110 |
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1111 int old_size = operands()->length(); |
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1112 int new_size = old_size + delta_size; |
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1113 int min_size = (delta_size > 0) ? old_size : new_size; |
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1114 |
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1115 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
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1116 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); |
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1117 |
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1118 // Set index in the resized array for existing elements only |
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1119 for (int idx = 0; idx < min_len; idx++) { |
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1120 int offset = operand_offset_at(idx); // offset in original array |
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1121 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array |
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1122 } |
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1123 // Copy the bootstrap specifiers only |
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1124 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), |
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1125 new_ops->adr_at(2*new_len), |
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1126 (min_size - 2*min_len) * sizeof(u2)); |
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1127 // Explicitly deallocate old operands array. |
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1128 // Note, it is not needed for 7u backport. |
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1129 if ( operands() != NULL) { // the safety check |
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1130 MetadataFactory::free_array<u2>(loader_data, operands()); |
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1131 } |
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1132 set_operands(new_ops); |
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1133 } // end resize_operands() |
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1134 |
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1135 |
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1136 // Extend the operands array with the length and size of the ext_cp operands. |
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1137 // Used in RedefineClasses for CP merge. |
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1138 void ConstantPool::extend_operands(constantPoolHandle ext_cp, TRAPS) { |
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1139 int delta_len = operand_array_length(ext_cp->operands()); |
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1140 if (delta_len == 0) { |
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1141 return; // nothing to do |
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1142 } |
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1143 int delta_size = ext_cp->operands()->length(); |
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1144 |
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1145 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); |
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1146 |
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1147 if (operand_array_length(operands()) == 0) { |
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1148 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
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1149 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); |
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1150 // The first element index defines the offset of second part |
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1151 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array |
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1152 set_operands(new_ops); |
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1153 } else { |
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1154 resize_operands(delta_len, delta_size, CHECK); |
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1155 } |
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1156 |
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1157 } // end extend_operands() |
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1158 |
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1159 |
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1160 // Shrink the operands array to a smaller array with new_len length. |
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1161 // Used in RedefineClasses for CP merge. |
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1162 void ConstantPool::shrink_operands(int new_len, TRAPS) { |
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1163 int old_len = operand_array_length(operands()); |
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1164 if (new_len == old_len) { |
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1165 return; // nothing to do |
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1166 } |
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1167 assert(new_len < old_len, "shrunken operands array must be smaller"); |
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1168 |
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1169 int free_base = operand_next_offset_at(new_len - 1); |
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1170 int delta_len = new_len - old_len; |
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1171 int delta_size = 2*delta_len + free_base - operands()->length(); |
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1172 |
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1173 resize_operands(delta_len, delta_size, CHECK); |
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1174 |
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1175 } // end shrink_operands() |
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1176 |
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1177 |
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1178 void ConstantPool::copy_operands(constantPoolHandle from_cp, |
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1179 constantPoolHandle to_cp, |
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1180 TRAPS) { |
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1181 |
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1182 int from_oplen = operand_array_length(from_cp->operands()); |
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1183 int old_oplen = operand_array_length(to_cp->operands()); |
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1184 if (from_oplen != 0) { |
6934 | 1185 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); |
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1186 // append my operands to the target's operands array |
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1187 if (old_oplen == 0) { |
6934 | 1188 // Can't just reuse from_cp's operand list because of deallocation issues |
1189 int len = from_cp->operands()->length(); | |
1190 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); | |
1191 Copy::conjoint_memory_atomic( | |
1192 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); | |
1193 to_cp->set_operands(new_ops); | |
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1194 } else { |
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1195 int old_len = to_cp->operands()->length(); |
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1196 int from_len = from_cp->operands()->length(); |
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1197 int old_off = old_oplen * sizeof(u2); |
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1198 int from_off = from_oplen * sizeof(u2); |
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1199 // Use the metaspace for the destination constant pool |
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1200 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); |
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1201 int fillp = 0, len = 0; |
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1202 // first part of dest |
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1203 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), |
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1204 new_operands->adr_at(fillp), |
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1205 (len = old_off) * sizeof(u2)); |
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1206 fillp += len; |
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1207 // first part of src |
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1208 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), |
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1209 new_operands->adr_at(fillp), |
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1210 (len = from_off) * sizeof(u2)); |
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1211 fillp += len; |
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1212 // second part of dest |
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1213 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), |
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1214 new_operands->adr_at(fillp), |
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1215 (len = old_len - old_off) * sizeof(u2)); |
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1216 fillp += len; |
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1217 // second part of src |
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1218 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), |
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1219 new_operands->adr_at(fillp), |
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1220 (len = from_len - from_off) * sizeof(u2)); |
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1221 fillp += len; |
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1222 assert(fillp == new_operands->length(), ""); |
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1223 |
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1224 // Adjust indexes in the first part of the copied operands array. |
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1225 for (int j = 0; j < from_oplen; j++) { |
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1226 int offset = operand_offset_at(new_operands, old_oplen + j); |
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1227 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); |
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1228 offset += old_len; // every new tuple is preceded by old_len extra u2's |
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1229 operand_offset_at_put(new_operands, old_oplen + j, offset); |
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1230 } |
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1231 |
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1232 // replace target operands array with combined array |
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1233 to_cp->set_operands(new_operands); |
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1234 } |
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1235 } |
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1236 } // end copy_operands() |
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1237 |
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1238 |
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1239 // Copy this constant pool's entries at start_i to end_i (inclusive) |
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1240 // to the constant pool to_cp's entries starting at to_i. A total of |
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1241 // (end_i - start_i) + 1 entries are copied. |
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1242 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, |
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1243 constantPoolHandle to_cp, int to_i, TRAPS) { |
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1244 |
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1245 |
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1246 int dest_i = to_i; // leave original alone for debug purposes |
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1247 |
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1248 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { |
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1249 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); |
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1250 |
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1251 switch (from_cp->tag_at(src_i).value()) { |
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1252 case JVM_CONSTANT_Double: |
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1253 case JVM_CONSTANT_Long: |
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1254 // double and long take two constant pool entries |
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1255 src_i += 2; |
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1256 dest_i += 2; |
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1257 break; |
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1258 |
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1259 default: |
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1260 // all others take one constant pool entry |
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1261 src_i++; |
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1262 dest_i++; |
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1263 break; |
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1264 } |
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1265 } |
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1266 copy_operands(from_cp, to_cp, CHECK); |
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1267 |
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1268 } // end copy_cp_to_impl() |
0 | 1269 |
1270 | |
1271 // Copy this constant pool's entry at from_i to the constant pool | |
1272 // to_cp's entry at to_i. | |
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1273 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i, |
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1274 constantPoolHandle to_cp, int to_i, |
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1275 TRAPS) { |
0 | 1276 |
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1277 int tag = from_cp->tag_at(from_i).value(); |
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1278 switch (tag) { |
0 | 1279 case JVM_CONSTANT_Class: |
1280 { | |
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1281 Klass* k = from_cp->klass_at(from_i, CHECK); |
0 | 1282 to_cp->klass_at_put(to_i, k); |
1283 } break; | |
1284 | |
1285 case JVM_CONSTANT_ClassIndex: | |
1286 { | |
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1287 jint ki = from_cp->klass_index_at(from_i); |
0 | 1288 to_cp->klass_index_at_put(to_i, ki); |
1289 } break; | |
1290 | |
1291 case JVM_CONSTANT_Double: | |
1292 { | |
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1293 jdouble d = from_cp->double_at(from_i); |
0 | 1294 to_cp->double_at_put(to_i, d); |
1295 // double takes two constant pool entries so init second entry's tag | |
1296 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1297 } break; | |
1298 | |
1299 case JVM_CONSTANT_Fieldref: | |
1300 { | |
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1301 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1302 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1303 to_cp->field_at_put(to_i, class_index, name_and_type_index); |
1304 } break; | |
1305 | |
1306 case JVM_CONSTANT_Float: | |
1307 { | |
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1308 jfloat f = from_cp->float_at(from_i); |
0 | 1309 to_cp->float_at_put(to_i, f); |
1310 } break; | |
1311 | |
1312 case JVM_CONSTANT_Integer: | |
1313 { | |
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1314 jint i = from_cp->int_at(from_i); |
0 | 1315 to_cp->int_at_put(to_i, i); |
1316 } break; | |
1317 | |
1318 case JVM_CONSTANT_InterfaceMethodref: | |
1319 { | |
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1320 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1321 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1322 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); |
1323 } break; | |
1324 | |
1325 case JVM_CONSTANT_Long: | |
1326 { | |
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1327 jlong l = from_cp->long_at(from_i); |
0 | 1328 to_cp->long_at_put(to_i, l); |
1329 // long takes two constant pool entries so init second entry's tag | |
1330 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1331 } break; | |
1332 | |
1333 case JVM_CONSTANT_Methodref: | |
1334 { | |
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1335 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1336 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1337 to_cp->method_at_put(to_i, class_index, name_and_type_index); |
1338 } break; | |
1339 | |
1340 case JVM_CONSTANT_NameAndType: | |
1341 { | |
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1342 int name_ref_index = from_cp->name_ref_index_at(from_i); |
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1343 int signature_ref_index = from_cp->signature_ref_index_at(from_i); |
0 | 1344 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); |
1345 } break; | |
1346 | |
1347 case JVM_CONSTANT_StringIndex: | |
1348 { | |
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1349 jint si = from_cp->string_index_at(from_i); |
0 | 1350 to_cp->string_index_at_put(to_i, si); |
1351 } break; | |
1352 | |
1353 case JVM_CONSTANT_UnresolvedClass: | |
1354 { | |
2332
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1355 // Can be resolved after checking tag, so check the slot first. |
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|
1356 CPSlot entry = from_cp->slot_at(from_i); |
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1357 if (entry.is_resolved()) { |
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1358 assert(entry.get_klass()->is_klass(), "must be"); |
2332
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|
1359 // Already resolved |
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1360 to_cp->klass_at_put(to_i, entry.get_klass()); |
2332
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1361 } else { |
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|
1362 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); |
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|
1363 } |
0 | 1364 } break; |
1365 | |
1366 case JVM_CONSTANT_UnresolvedClassInError: | |
1367 { | |
2177
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|
1368 Symbol* k = from_cp->unresolved_klass_at(from_i); |
0 | 1369 to_cp->unresolved_klass_at_put(to_i, k); |
1370 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError); | |
1371 } break; | |
1372 | |
1373 | |
6725
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1374 case JVM_CONSTANT_String: |
0 | 1375 { |
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1376 Symbol* s = from_cp->unresolved_string_at(from_i); |
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|
1377 to_cp->unresolved_string_at_put(to_i, s); |
0 | 1378 } break; |
1379 | |
1380 case JVM_CONSTANT_Utf8: | |
1381 { | |
2177
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1382 Symbol* s = from_cp->symbol_at(from_i); |
6725
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1383 // Need to increase refcount, the old one will be thrown away and deferenced |
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1384 s->increment_refcount(); |
0 | 1385 to_cp->symbol_at_put(to_i, s); |
1386 } break; | |
1387 | |
1602 | 1388 case JVM_CONSTANT_MethodType: |
1389 { | |
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|
1390 jint k = from_cp->method_type_index_at(from_i); |
1602 | 1391 to_cp->method_type_index_at_put(to_i, k); |
1392 } break; | |
1393 | |
1394 case JVM_CONSTANT_MethodHandle: | |
1395 { | |
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|
1396 int k1 = from_cp->method_handle_ref_kind_at(from_i); |
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|
1397 int k2 = from_cp->method_handle_index_at(from_i); |
1602 | 1398 to_cp->method_handle_index_at_put(to_i, k1, k2); |
1399 } break; | |
1400 | |
1660
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diff
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|
1401 case JVM_CONSTANT_InvokeDynamic: |
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|
1402 { |
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|
1403 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); |
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|
1404 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); |
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1405 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands |
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|
1406 to_cp->invoke_dynamic_at_put(to_i, k1, k2); |
1660
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1602
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|
1407 } break; |
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|
1408 |
0 | 1409 // Invalid is used as the tag for the second constant pool entry |
1410 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1411 // not be seen by itself. | |
1412 case JVM_CONSTANT_Invalid: // fall through | |
1413 | |
1414 default: | |
1415 { | |
1416 ShouldNotReachHere(); | |
1417 } break; | |
1418 } | |
1419 } // end copy_entry_to() | |
1420 | |
1421 | |
1422 // Search constant pool search_cp for an entry that matches this | |
1423 // constant pool's entry at pattern_i. Returns the index of a | |
1424 // matching entry or zero (0) if there is no matching entry. | |
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1425 int ConstantPool::find_matching_entry(int pattern_i, |
0 | 1426 constantPoolHandle search_cp, TRAPS) { |
1427 | |
1428 // index zero (0) is not used | |
1429 for (int i = 1; i < search_cp->length(); i++) { | |
1430 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); | |
1431 if (found) { | |
1432 return i; | |
1433 } | |
1434 } | |
1435 | |
1436 return 0; // entry not found; return unused index zero (0) | |
1437 } // end find_matching_entry() | |
1438 | |
1439 | |
10151
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1440 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool |
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1441 // cp2's bootstrap specifier at idx2. |
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1442 bool ConstantPool::compare_operand_to(int idx1, constantPoolHandle cp2, int idx2, TRAPS) { |
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1443 int k1 = operand_bootstrap_method_ref_index_at(idx1); |
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1444 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); |
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1445 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1446 |
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1447 if (!match) { |
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1448 return false; |
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1449 } |
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1450 int argc = operand_argument_count_at(idx1); |
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1451 if (argc == cp2->operand_argument_count_at(idx2)) { |
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1452 for (int j = 0; j < argc; j++) { |
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1453 k1 = operand_argument_index_at(idx1, j); |
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1454 k2 = cp2->operand_argument_index_at(idx2, j); |
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1455 match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1456 if (!match) { |
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1457 return false; |
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1458 } |
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1459 } |
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1460 return true; // got through loop; all elements equal |
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1461 } |
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1462 return false; |
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1463 } // end compare_operand_to() |
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1464 |
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1465 // Search constant pool search_cp for a bootstrap specifier that matches |
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1466 // this constant pool's bootstrap specifier at pattern_i index. |
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1467 // Return the index of a matching bootstrap specifier or (-1) if there is no match. |
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1468 int ConstantPool::find_matching_operand(int pattern_i, |
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1469 constantPoolHandle search_cp, int search_len, TRAPS) { |
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1470 for (int i = 0; i < search_len; i++) { |
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1471 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); |
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1472 if (found) { |
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1473 return i; |
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1474 } |
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1475 } |
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1476 return -1; // bootstrap specifier not found; return unused index (-1) |
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1477 } // end find_matching_operand() |
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1478 |
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1479 |
0 | 1480 #ifndef PRODUCT |
1481 | |
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1482 const char* ConstantPool::printable_name_at(int which) { |
0 | 1483 |
1484 constantTag tag = tag_at(which); | |
1485 | |
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1486 if (tag.is_string()) { |
0 | 1487 return string_at_noresolve(which); |
1488 } else if (tag.is_klass() || tag.is_unresolved_klass()) { | |
1489 return klass_name_at(which)->as_C_string(); | |
1490 } else if (tag.is_symbol()) { | |
1491 return symbol_at(which)->as_C_string(); | |
1492 } | |
1493 return ""; | |
1494 } | |
1495 | |
1496 #endif // PRODUCT | |
1497 | |
1498 | |
1499 // JVMTI GetConstantPool support | |
1500 | |
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1501 // For debugging of constant pool |
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1502 const bool debug_cpool = false; |
0 | 1503 |
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1504 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) |
0 | 1505 |
1506 static void print_cpool_bytes(jint cnt, u1 *bytes) { | |
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1507 const char* WARN_MSG = "Must not be such entry!"; |
0 | 1508 jint size = 0; |
1509 u2 idx1, idx2; | |
1510 | |
1511 for (jint idx = 1; idx < cnt; idx++) { | |
1512 jint ent_size = 0; | |
1513 u1 tag = *bytes++; | |
1514 size++; // count tag | |
1515 | |
1516 printf("const #%03d, tag: %02d ", idx, tag); | |
1517 switch(tag) { | |
1518 case JVM_CONSTANT_Invalid: { | |
1519 printf("Invalid"); | |
1520 break; | |
1521 } | |
1522 case JVM_CONSTANT_Unicode: { | |
1523 printf("Unicode %s", WARN_MSG); | |
1524 break; | |
1525 } | |
1526 case JVM_CONSTANT_Utf8: { | |
1527 u2 len = Bytes::get_Java_u2(bytes); | |
1528 char str[128]; | |
1529 if (len > 127) { | |
1530 len = 127; | |
1531 } | |
1532 strncpy(str, (char *) (bytes+2), len); | |
1533 str[len] = '\0'; | |
1534 printf("Utf8 \"%s\"", str); | |
1535 ent_size = 2 + len; | |
1536 break; | |
1537 } | |
1538 case JVM_CONSTANT_Integer: { | |
1539 u4 val = Bytes::get_Java_u4(bytes); | |
1540 printf("int %d", *(int *) &val); | |
1541 ent_size = 4; | |
1542 break; | |
1543 } | |
1544 case JVM_CONSTANT_Float: { | |
1545 u4 val = Bytes::get_Java_u4(bytes); | |
1546 printf("float %5.3ff", *(float *) &val); | |
1547 ent_size = 4; | |
1548 break; | |
1549 } | |
1550 case JVM_CONSTANT_Long: { | |
1551 u8 val = Bytes::get_Java_u8(bytes); | |
3960 | 1552 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val); |
0 | 1553 ent_size = 8; |
1554 idx++; // Long takes two cpool slots | |
1555 break; | |
1556 } | |
1557 case JVM_CONSTANT_Double: { | |
1558 u8 val = Bytes::get_Java_u8(bytes); | |
1559 printf("double %5.3fd", *(jdouble *)&val); | |
1560 ent_size = 8; | |
1561 idx++; // Double takes two cpool slots | |
1562 break; | |
1563 } | |
1564 case JVM_CONSTANT_Class: { | |
1565 idx1 = Bytes::get_Java_u2(bytes); | |
1566 printf("class #%03d", idx1); | |
1567 ent_size = 2; | |
1568 break; | |
1569 } | |
1570 case JVM_CONSTANT_String: { | |
1571 idx1 = Bytes::get_Java_u2(bytes); | |
1572 printf("String #%03d", idx1); | |
1573 ent_size = 2; | |
1574 break; | |
1575 } | |
1576 case JVM_CONSTANT_Fieldref: { | |
1577 idx1 = Bytes::get_Java_u2(bytes); | |
1578 idx2 = Bytes::get_Java_u2(bytes+2); | |
1579 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); | |
1580 ent_size = 4; | |
1581 break; | |
1582 } | |
1583 case JVM_CONSTANT_Methodref: { | |
1584 idx1 = Bytes::get_Java_u2(bytes); | |
1585 idx2 = Bytes::get_Java_u2(bytes+2); | |
1586 printf("Method #%03d, #%03d", idx1, idx2); | |
1587 ent_size = 4; | |
1588 break; | |
1589 } | |
1590 case JVM_CONSTANT_InterfaceMethodref: { | |
1591 idx1 = Bytes::get_Java_u2(bytes); | |
1592 idx2 = Bytes::get_Java_u2(bytes+2); | |
1593 printf("InterfMethod #%03d, #%03d", idx1, idx2); | |
1594 ent_size = 4; | |
1595 break; | |
1596 } | |
1597 case JVM_CONSTANT_NameAndType: { | |
1598 idx1 = Bytes::get_Java_u2(bytes); | |
1599 idx2 = Bytes::get_Java_u2(bytes+2); | |
1600 printf("NameAndType #%03d, #%03d", idx1, idx2); | |
1601 ent_size = 4; | |
1602 break; | |
1603 } | |
1604 case JVM_CONSTANT_ClassIndex: { | |
1605 printf("ClassIndex %s", WARN_MSG); | |
1606 break; | |
1607 } | |
1608 case JVM_CONSTANT_UnresolvedClass: { | |
1609 printf("UnresolvedClass: %s", WARN_MSG); | |
1610 break; | |
1611 } | |
1612 case JVM_CONSTANT_UnresolvedClassInError: { | |
1613 printf("UnresolvedClassInErr: %s", WARN_MSG); | |
1614 break; | |
1615 } | |
1616 case JVM_CONSTANT_StringIndex: { | |
1617 printf("StringIndex: %s", WARN_MSG); | |
1618 break; | |
1619 } | |
1620 } | |
1621 printf(";\n"); | |
1622 bytes += ent_size; | |
1623 size += ent_size; | |
1624 } | |
1625 printf("Cpool size: %d\n", size); | |
1626 fflush(0); | |
1627 return; | |
1628 } /* end print_cpool_bytes */ | |
1629 | |
1630 | |
1631 // Returns size of constant pool entry. | |
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1632 jint ConstantPool::cpool_entry_size(jint idx) { |
0 | 1633 switch(tag_at(idx).value()) { |
1634 case JVM_CONSTANT_Invalid: | |
1635 case JVM_CONSTANT_Unicode: | |
1636 return 1; | |
1637 | |
1638 case JVM_CONSTANT_Utf8: | |
1639 return 3 + symbol_at(idx)->utf8_length(); | |
1640 | |
1641 case JVM_CONSTANT_Class: | |
1642 case JVM_CONSTANT_String: | |
1643 case JVM_CONSTANT_ClassIndex: | |
1644 case JVM_CONSTANT_UnresolvedClass: | |
1645 case JVM_CONSTANT_UnresolvedClassInError: | |
1646 case JVM_CONSTANT_StringIndex: | |
1602 | 1647 case JVM_CONSTANT_MethodType: |
0 | 1648 return 3; |
1649 | |
1602 | 1650 case JVM_CONSTANT_MethodHandle: |
1651 return 4; //tag, ref_kind, ref_index | |
1652 | |
0 | 1653 case JVM_CONSTANT_Integer: |
1654 case JVM_CONSTANT_Float: | |
1655 case JVM_CONSTANT_Fieldref: | |
1656 case JVM_CONSTANT_Methodref: | |
1657 case JVM_CONSTANT_InterfaceMethodref: | |
1658 case JVM_CONSTANT_NameAndType: | |
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1659 return 5; |
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1660 |
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1661 case JVM_CONSTANT_InvokeDynamic: |
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1662 // u1 tag, u2 bsm, u2 nt |
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1663 return 5; |
0 | 1664 |
1665 case JVM_CONSTANT_Long: | |
1666 case JVM_CONSTANT_Double: | |
1667 return 9; | |
1668 } | |
1669 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); | |
1670 return 1; | |
1671 } /* end cpool_entry_size */ | |
1672 | |
1673 | |
1674 // SymbolHashMap is used to find a constant pool index from a string. | |
1675 // This function fills in SymbolHashMaps, one for utf8s and one for | |
1676 // class names, returns size of the cpool raw bytes. | |
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1677 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, |
0 | 1678 SymbolHashMap *classmap) { |
1679 jint size = 0; | |
1680 | |
1681 for (u2 idx = 1; idx < length(); idx++) { | |
1682 u2 tag = tag_at(idx).value(); | |
1683 size += cpool_entry_size(idx); | |
1684 | |
1685 switch(tag) { | |
1686 case JVM_CONSTANT_Utf8: { | |
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1687 Symbol* sym = symbol_at(idx); |
0 | 1688 symmap->add_entry(sym, idx); |
1689 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); | |
1690 break; | |
1691 } | |
1692 case JVM_CONSTANT_Class: | |
1693 case JVM_CONSTANT_UnresolvedClass: | |
1694 case JVM_CONSTANT_UnresolvedClassInError: { | |
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1695 Symbol* sym = klass_name_at(idx); |
0 | 1696 classmap->add_entry(sym, idx); |
1697 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); | |
1698 break; | |
1699 } | |
1700 case JVM_CONSTANT_Long: | |
1701 case JVM_CONSTANT_Double: { | |
1702 idx++; // Both Long and Double take two cpool slots | |
1703 break; | |
1704 } | |
1705 } | |
1706 } | |
1707 return size; | |
1708 } /* end hash_utf8_entries_to */ | |
1709 | |
1710 | |
1711 // Copy cpool bytes. | |
1712 // Returns: | |
1713 // 0, in case of OutOfMemoryError | |
1714 // -1, in case of internal error | |
1715 // > 0, count of the raw cpool bytes that have been copied | |
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1716 int ConstantPool::copy_cpool_bytes(int cpool_size, |
0 | 1717 SymbolHashMap* tbl, |
1718 unsigned char *bytes) { | |
1719 u2 idx1, idx2; | |
1720 jint size = 0; | |
1721 jint cnt = length(); | |
1722 unsigned char *start_bytes = bytes; | |
1723 | |
1724 for (jint idx = 1; idx < cnt; idx++) { | |
1725 u1 tag = tag_at(idx).value(); | |
1726 jint ent_size = cpool_entry_size(idx); | |
1727 | |
1728 assert(size + ent_size <= cpool_size, "Size mismatch"); | |
1729 | |
1730 *bytes = tag; | |
1731 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); | |
1732 switch(tag) { | |
1733 case JVM_CONSTANT_Invalid: { | |
1734 DBG(printf("JVM_CONSTANT_Invalid")); | |
1735 break; | |
1736 } | |
1737 case JVM_CONSTANT_Unicode: { | |
1738 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); | |
1739 DBG(printf("JVM_CONSTANT_Unicode")); | |
1740 break; | |
1741 } | |
1742 case JVM_CONSTANT_Utf8: { | |
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1743 Symbol* sym = symbol_at(idx); |
0 | 1744 char* str = sym->as_utf8(); |
1745 // Warning! It's crashing on x86 with len = sym->utf8_length() | |
1746 int len = (int) strlen(str); | |
1747 Bytes::put_Java_u2((address) (bytes+1), (u2) len); | |
1748 for (int i = 0; i < len; i++) { | |
1749 bytes[3+i] = (u1) str[i]; | |
1750 } | |
1751 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); | |
1752 break; | |
1753 } | |
1754 case JVM_CONSTANT_Integer: { | |
1755 jint val = int_at(idx); | |
1756 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1757 break; | |
1758 } | |
1759 case JVM_CONSTANT_Float: { | |
1760 jfloat val = float_at(idx); | |
1761 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1762 break; | |
1763 } | |
1764 case JVM_CONSTANT_Long: { | |
1765 jlong val = long_at(idx); | |
1766 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1767 idx++; // Long takes two cpool slots | |
1768 break; | |
1769 } | |
1770 case JVM_CONSTANT_Double: { | |
1771 jdouble val = double_at(idx); | |
1772 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1773 idx++; // Double takes two cpool slots | |
1774 break; | |
1775 } | |
1776 case JVM_CONSTANT_Class: | |
1777 case JVM_CONSTANT_UnresolvedClass: | |
1778 case JVM_CONSTANT_UnresolvedClassInError: { | |
1779 *bytes = JVM_CONSTANT_Class; | |
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1780 Symbol* sym = klass_name_at(idx); |
0 | 1781 idx1 = tbl->symbol_to_value(sym); |
1782 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1783 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1784 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); | |
1785 break; | |
1786 } | |
1787 case JVM_CONSTANT_String: { | |
1788 *bytes = JVM_CONSTANT_String; | |
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1789 Symbol* sym = unresolved_string_at(idx); |
0 | 1790 idx1 = tbl->symbol_to_value(sym); |
1791 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1792 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
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1793 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); |
0 | 1794 break; |
1795 } | |
1796 case JVM_CONSTANT_Fieldref: | |
1797 case JVM_CONSTANT_Methodref: | |
1798 case JVM_CONSTANT_InterfaceMethodref: { | |
1799 idx1 = uncached_klass_ref_index_at(idx); | |
1800 idx2 = uncached_name_and_type_ref_index_at(idx); | |
1801 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1802 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1803 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); | |
1804 break; | |
1805 } | |
1806 case JVM_CONSTANT_NameAndType: { | |
1807 idx1 = name_ref_index_at(idx); | |
1808 idx2 = signature_ref_index_at(idx); | |
1809 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1810 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1811 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); | |
1812 break; | |
1813 } | |
1814 case JVM_CONSTANT_ClassIndex: { | |
1815 *bytes = JVM_CONSTANT_Class; | |
1816 idx1 = klass_index_at(idx); | |
1817 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1818 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); | |
1819 break; | |
1820 } | |
1821 case JVM_CONSTANT_StringIndex: { | |
1822 *bytes = JVM_CONSTANT_String; | |
1823 idx1 = string_index_at(idx); | |
1824 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1825 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); | |
1826 break; | |
1827 } | |
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1828 case JVM_CONSTANT_MethodHandle: |
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1829 case JVM_CONSTANT_MethodHandleInError: { |
1602 | 1830 *bytes = JVM_CONSTANT_MethodHandle; |
1831 int kind = method_handle_ref_kind_at(idx); | |
1832 idx1 = method_handle_index_at(idx); | |
1833 *(bytes+1) = (unsigned char) kind; | |
1834 Bytes::put_Java_u2((address) (bytes+2), idx1); | |
1835 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); | |
1836 break; | |
1837 } | |
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1838 case JVM_CONSTANT_MethodType: |
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1839 case JVM_CONSTANT_MethodTypeInError: { |
1602 | 1840 *bytes = JVM_CONSTANT_MethodType; |
1841 idx1 = method_type_index_at(idx); | |
1842 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1843 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); | |
1844 break; | |
1845 } | |
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1846 case JVM_CONSTANT_InvokeDynamic: { |
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1847 *bytes = tag; |
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1848 idx1 = extract_low_short_from_int(*int_at_addr(idx)); |
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1849 idx2 = extract_high_short_from_int(*int_at_addr(idx)); |
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1850 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); |
1660
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1851 Bytes::put_Java_u2((address) (bytes+1), idx1); |
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1852 Bytes::put_Java_u2((address) (bytes+3), idx2); |
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1853 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); |
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1854 break; |
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|
1855 } |
0 | 1856 } |
1857 DBG(printf("\n")); | |
1858 bytes += ent_size; | |
1859 size += ent_size; | |
1860 } | |
1861 assert(size == cpool_size, "Size mismatch"); | |
1862 | |
1863 // Keep temorarily for debugging until it's stable. | |
1864 DBG(print_cpool_bytes(cnt, start_bytes)); | |
1865 return (int)(bytes - start_bytes); | |
1866 } /* end copy_cpool_bytes */ | |
1867 | |
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1868 #undef DBG |
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1869 |
0 | 1870 |
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1871 void ConstantPool::set_on_stack(const bool value) { |
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1872 if (value) { |
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1873 _flags |= _on_stack; |
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1874 } else { |
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1875 _flags &= ~_on_stack; |
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1876 } |
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1877 if (value) MetadataOnStackMark::record(this); |
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1878 } |
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1879 |
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1880 // JSR 292 support for patching constant pool oops after the class is linked and |
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1881 // the oop array for resolved references are created. |
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1882 // We can't do this during classfile parsing, which is how the other indexes are |
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1883 // patched. The other patches are applied early for some error checking |
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1884 // so only defer the pseudo_strings. |
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1885 void ConstantPool::patch_resolved_references( |
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1886 GrowableArray<Handle>* cp_patches) { |
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1887 assert(EnableInvokeDynamic, ""); |
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1888 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused |
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1889 Handle patch = cp_patches->at(index); |
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1890 if (patch.not_null()) { |
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1891 assert (tag_at(index).is_string(), "should only be string left"); |
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1892 // Patching a string means pre-resolving it. |
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1893 // The spelling in the constant pool is ignored. |
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1894 // The constant reference may be any object whatever. |
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1895 // If it is not a real interned string, the constant is referred |
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1896 // to as a "pseudo-string", and must be presented to the CP |
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1897 // explicitly, because it may require scavenging. |
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1898 int obj_index = cp_to_object_index(index); |
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1899 pseudo_string_at_put(index, obj_index, patch()); |
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1900 DEBUG_ONLY(cp_patches->at_put(index, Handle());) |
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1901 } |
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1902 } |
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1903 #ifdef ASSERT |
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1904 // Ensure that all the patches have been used. |
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1905 for (int index = 0; index < cp_patches->length(); index++) { |
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1906 assert(cp_patches->at(index).is_null(), |
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1907 err_msg("Unused constant pool patch at %d in class file %s", |
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1908 index, |
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1909 pool_holder()->external_name())); |
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1910 } |
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1911 #endif // ASSERT |
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1912 } |
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1913 |
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1914 #ifndef PRODUCT |
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1915 |
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1916 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool |
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1917 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { |
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1918 guarantee(obj->is_constantPool(), "object must be constant pool"); |
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1919 constantPoolHandle cp(THREAD, (ConstantPool*)obj); |
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1920 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); |
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1921 |
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1922 for (int i = 0; i< cp->length(); i++) { |
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1923 if (cp->tag_at(i).is_unresolved_klass()) { |
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1924 // This will force loading of the class |
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1925 Klass* klass = cp->klass_at(i, CHECK); |
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1926 if (klass->oop_is_instance()) { |
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1927 // Force initialization of class |
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1928 InstanceKlass::cast(klass)->initialize(CHECK); |
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1929 } |
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1930 } |
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1931 } |
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1932 } |
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1933 |
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1934 #endif |
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1935 |
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1936 |
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1937 // Printing |
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1938 |
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1939 void ConstantPool::print_on(outputStream* st) const { |
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1940 EXCEPTION_MARK; |
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1941 assert(is_constantPool(), "must be constantPool"); |
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1942 st->print_cr(internal_name()); |
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1943 if (flags() != 0) { |
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1944 st->print(" - flags: 0x%x", flags()); |
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1945 if (has_preresolution()) st->print(" has_preresolution"); |
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1946 if (on_stack()) st->print(" on_stack"); |
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1947 st->cr(); |
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1948 } |
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1949 if (pool_holder() != NULL) { |
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1950 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder()); |
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1951 } |
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1952 st->print_cr(" - cache: " INTPTR_FORMAT, cache()); |
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1953 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references()); |
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1954 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map()); |
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1955 |
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1956 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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1957 ((ConstantPool*)this)->print_entry_on(index, st); |
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1958 switch (tag_at(index).value()) { |
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1959 case JVM_CONSTANT_Long : |
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1960 case JVM_CONSTANT_Double : |
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1961 index++; // Skip entry following eigth-byte constant |
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1962 } |
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1963 |
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1964 } |
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1965 st->cr(); |
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1966 } |
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1967 |
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1968 // Print one constant pool entry |
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1969 void ConstantPool::print_entry_on(const int index, outputStream* st) { |
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1970 EXCEPTION_MARK; |
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1971 st->print(" - %3d : ", index); |
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1972 tag_at(index).print_on(st); |
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1973 st->print(" : "); |
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1974 switch (tag_at(index).value()) { |
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1975 case JVM_CONSTANT_Class : |
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1976 { Klass* k = klass_at(index, CATCH); |
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1977 guarantee(k != NULL, "need klass"); |
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1978 k->print_value_on(st); |
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1979 st->print(" {0x%lx}", (address)k); |
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1980 } |
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1981 break; |
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1982 case JVM_CONSTANT_Fieldref : |
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1983 case JVM_CONSTANT_Methodref : |
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1984 case JVM_CONSTANT_InterfaceMethodref : |
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1985 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); |
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1986 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); |
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1987 break; |
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1988 case JVM_CONSTANT_String : |
8104 | 1989 if (is_pseudo_string_at(index)) { |
1990 oop anObj = pseudo_string_at(index); | |
1991 anObj->print_value_on(st); | |
1992 st->print(" {0x%lx}", (address)anObj); | |
1993 } else { | |
1994 unresolved_string_at(index)->print_value_on(st); | |
1995 } | |
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1996 break; |
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1997 case JVM_CONSTANT_Integer : |
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1998 st->print("%d", int_at(index)); |
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1999 break; |
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2000 case JVM_CONSTANT_Float : |
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2001 st->print("%f", float_at(index)); |
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2002 break; |
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2003 case JVM_CONSTANT_Long : |
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2004 st->print_jlong(long_at(index)); |
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2005 break; |
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2006 case JVM_CONSTANT_Double : |
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2007 st->print("%lf", double_at(index)); |
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2008 break; |
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2009 case JVM_CONSTANT_NameAndType : |
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2010 st->print("name_index=%d", name_ref_index_at(index)); |
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2011 st->print(" signature_index=%d", signature_ref_index_at(index)); |
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2012 break; |
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2013 case JVM_CONSTANT_Utf8 : |
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2014 symbol_at(index)->print_value_on(st); |
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2015 break; |
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2016 case JVM_CONSTANT_UnresolvedClass : // fall-through |
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2017 case JVM_CONSTANT_UnresolvedClassInError: { |
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2018 // unresolved_klass_at requires lock or safe world. |
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2019 CPSlot entry = slot_at(index); |
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2020 if (entry.is_resolved()) { |
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2021 entry.get_klass()->print_value_on(st); |
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2022 } else { |
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2023 entry.get_symbol()->print_value_on(st); |
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2024 } |
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2025 } |
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2026 break; |
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2027 case JVM_CONSTANT_MethodHandle : |
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2028 case JVM_CONSTANT_MethodHandleInError : |
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2029 st->print("ref_kind=%d", method_handle_ref_kind_at(index)); |
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2030 st->print(" ref_index=%d", method_handle_index_at(index)); |
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2031 break; |
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2032 case JVM_CONSTANT_MethodType : |
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2033 case JVM_CONSTANT_MethodTypeInError : |
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2034 st->print("signature_index=%d", method_type_index_at(index)); |
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2035 break; |
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2036 case JVM_CONSTANT_InvokeDynamic : |
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2037 { |
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2038 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); |
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2039 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); |
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2040 int argc = invoke_dynamic_argument_count_at(index); |
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2041 if (argc > 0) { |
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2042 for (int arg_i = 0; arg_i < argc; arg_i++) { |
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2043 int arg = invoke_dynamic_argument_index_at(index, arg_i); |
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2044 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); |
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2045 } |
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2046 st->print("}"); |
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2047 } |
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2048 } |
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2049 break; |
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2050 default: |
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2051 ShouldNotReachHere(); |
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2052 break; |
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2053 } |
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2054 st->cr(); |
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2055 } |
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2056 |
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2057 void ConstantPool::print_value_on(outputStream* st) const { |
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2058 assert(is_constantPool(), "must be constantPool"); |
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2059 st->print("constant pool [%d]", length()); |
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2060 if (has_preresolution()) st->print("/preresolution"); |
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2061 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); |
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2062 print_address_on(st); |
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2063 st->print(" for "); |
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2064 pool_holder()->print_value_on(st); |
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2065 if (pool_holder() != NULL) { |
6940
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2066 bool extra = (pool_holder()->constants() != this); |
6725
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2067 if (extra) st->print(" (extra)"); |
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2068 } |
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2069 if (cache() != NULL) { |
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2070 st->print(" cache=" PTR_FORMAT, cache()); |
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2071 } |
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2072 } |
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2073 |
7956 | 2074 #if INCLUDE_SERVICES |
2075 // Size Statistics | |
2076 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { | |
2077 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); | |
2078 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); | |
2079 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); | |
2080 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); | |
2081 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); | |
2082 | |
2083 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + | |
2084 sz->_cp_refmap_bytes; | |
2085 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; | |
2086 } | |
2087 #endif // INCLUDE_SERVICES | |
6725
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2088 |
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2089 // Verification |
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2090 |
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2091 void ConstantPool::verify_on(outputStream* st) { |
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2092 guarantee(is_constantPool(), "object must be constant pool"); |
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2093 for (int i = 0; i< length(); i++) { |
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2094 constantTag tag = tag_at(i); |
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2095 CPSlot entry = slot_at(i); |
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2096 if (tag.is_klass()) { |
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2097 if (entry.is_resolved()) { |
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2098 guarantee(entry.get_klass()->is_klass(), "should be klass"); |
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2099 } |
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2100 } else if (tag.is_unresolved_klass()) { |
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2101 if (entry.is_resolved()) { |
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2102 guarantee(entry.get_klass()->is_klass(), "should be klass"); |
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2103 } |
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2104 } else if (tag.is_symbol()) { |
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2105 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
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2106 } else if (tag.is_string()) { |
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2107 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
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2108 } |
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2109 } |
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2110 if (cache() != NULL) { |
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2111 // Note: cache() can be NULL before a class is completely setup or |
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2112 // in temporary constant pools used during constant pool merging |
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2113 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); |
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2114 } |
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2115 if (pool_holder() != NULL) { |
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2116 // Note: pool_holder() can be NULL in temporary constant pools |
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2117 // used during constant pool merging |
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2118 guarantee(pool_holder()->is_klass(), "should be klass"); |
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2119 } |
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2120 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2121 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
2122 |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2011
diff
changeset
|
2123 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { |
0 | 2124 char *str = sym->as_utf8(); |
2125 unsigned int hash = compute_hash(str, sym->utf8_length()); | |
2126 unsigned int index = hash % table_size(); | |
2127 | |
2128 // check if already in map | |
2129 // we prefer the first entry since it is more likely to be what was used in | |
2130 // the class file | |
2131 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2132 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2133 if (en->hash() == hash && en->symbol() == sym) { | |
2134 return; // already there | |
2135 } | |
2136 } | |
2137 | |
2138 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); | |
2139 entry->set_next(bucket(index)); | |
2140 _buckets[index].set_entry(entry); | |
2141 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2142 } | |
2143 | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2011
diff
changeset
|
2144 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { |
0 | 2145 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); |
2146 char *str = sym->as_utf8(); | |
2147 int len = sym->utf8_length(); | |
2148 unsigned int hash = SymbolHashMap::compute_hash(str, len); | |
2149 unsigned int index = hash % table_size(); | |
2150 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2151 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2152 if (en->hash() == hash && en->symbol() == sym) { | |
2153 return en; | |
2154 } | |
2155 } | |
2156 return NULL; | |
2157 } |