Mercurial > hg > truffle
annotate src/share/vm/oops/constantPool.cpp @ 14247:2e96b2d61686
8031530: [TESTBUG] Enable test runtime/LoadClass/LoadClassNegative.java
Summary: Re-enabled the test. The issue that prevents this test from running was fixed by 8020675
Reviewed-by: sla, ccheung
author | zgu |
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date | Mon, 13 Jan 2014 10:05:37 -0500 |
parents | b8860472c377 |
children | 096c224171c4 febc6428bc79 10c9507f544a |
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" |
43 #include "runtime/vframe.hpp" | |
0 | 44 |
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45 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { |
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46 // Tags are RW but comment below applies to tags also. |
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47 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); |
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48 |
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49 int size = ConstantPool::size(length); |
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50 |
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51 // CDS considerations: |
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52 // Allocate read-write but may be able to move to read-only at dumping time |
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53 // if all the klasses are resolved. The only other field that is writable is |
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54 // the resolved_references array, which is recreated at startup time. |
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55 // But that could be moved to InstanceKlass (although a pain to access from |
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56 // assembly code). Maybe it could be moved to the cpCache which is RW. |
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57 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); |
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58 } |
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59 |
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60 ConstantPool::ConstantPool(Array<u1>* tags) { |
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61 set_length(tags->length()); |
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62 set_tags(NULL); |
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63 set_cache(NULL); |
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64 set_reference_map(NULL); |
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65 set_resolved_references(NULL); |
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66 set_operands(NULL); |
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67 set_pool_holder(NULL); |
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68 set_flags(0); |
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69 |
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70 // only set to non-zero if constant pool is merged by RedefineClasses |
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71 set_version(0); |
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72 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock")); |
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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 delete _lock; |
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100 set_lock(NULL); |
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101 } |
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102 |
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103 objArrayOop ConstantPool::resolved_references() const { |
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104 return (objArrayOop)JNIHandles::resolve(_resolved_references); |
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105 } |
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106 |
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107 // Create resolved_references array and mapping array for original cp indexes |
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108 // The ldc bytecode was rewritten to have the resolved reference array index so need a way |
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109 // to map it back for resolving and some unlikely miscellaneous uses. |
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110 // The objects created by invokedynamic are appended to this list. |
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111 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, |
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112 intStack reference_map, |
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113 int constant_pool_map_length, |
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114 TRAPS) { |
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115 // Initialized the resolved object cache. |
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116 int map_length = reference_map.length(); |
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117 if (map_length > 0) { |
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118 // Only need mapping back to constant pool entries. The map isn't used for |
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119 // invokedynamic resolved_reference entries. For invokedynamic entries, |
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120 // the constant pool cache index has the mapping back to both the constant |
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121 // pool and to the resolved reference index. |
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122 if (constant_pool_map_length > 0) { |
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123 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK); |
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124 |
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125 for (int i = 0; i < constant_pool_map_length; i++) { |
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126 int x = reference_map.at(i); |
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127 assert(x == (int)(jushort) x, "klass index is too big"); |
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128 om->at_put(i, (jushort)x); |
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129 } |
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130 set_reference_map(om); |
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131 } |
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132 |
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133 // Create Java array for holding resolved strings, methodHandles, |
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134 // methodTypes, invokedynamic and invokehandle appendix objects, etc. |
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135 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); |
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136 Handle refs_handle (THREAD, (oop)stom); // must handleize. |
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137 set_resolved_references(loader_data->add_handle(refs_handle)); |
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138 } |
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139 } |
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140 |
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141 // CDS support. Create a new resolved_references array. |
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142 void ConstantPool::restore_unshareable_info(TRAPS) { |
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143 |
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144 // restore the C++ vtable from the shared archive |
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145 restore_vtable(); |
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146 |
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147 if (SystemDictionary::Object_klass_loaded()) { |
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148 // Recreate the object array and add to ClassLoaderData. |
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149 int map_length = resolved_reference_length(); |
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150 if (map_length > 0) { |
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151 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); |
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152 Handle refs_handle (THREAD, (oop)stom); // must handleize. |
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153 |
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154 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
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155 set_resolved_references(loader_data->add_handle(refs_handle)); |
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156 } |
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157 |
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158 // Also need to recreate the mutex. Make sure this matches the constructor |
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159 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock")); |
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160 } |
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161 } |
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162 |
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163 void ConstantPool::remove_unshareable_info() { |
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164 // Resolved references are not in the shared archive. |
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165 // Save the length for restoration. It is not necessarily the same length |
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166 // as reference_map.length() if invokedynamic is saved. |
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167 set_resolved_reference_length( |
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168 resolved_references() != NULL ? resolved_references()->length() : 0); |
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169 set_resolved_references(NULL); |
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170 set_lock(NULL); |
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171 } |
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172 |
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173 int ConstantPool::cp_to_object_index(int cp_index) { |
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174 // this is harder don't do this so much. |
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175 int i = reference_map()->find(cp_index); |
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176 // We might not find the index for jsr292 call. |
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177 return (i < 0) ? _no_index_sentinel : i; |
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178 } |
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179 |
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180 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) { |
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181 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
0 | 182 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and |
183 // tag is not updated atomicly. | |
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184 |
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185 CPSlot entry = this_oop->slot_at(which); |
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186 if (entry.is_resolved()) { |
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187 assert(entry.get_klass()->is_klass(), "must be"); |
0 | 188 // Already resolved - return entry. |
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189 return entry.get_klass(); |
0 | 190 } |
191 | |
192 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object | |
193 // already has updated the object | |
194 assert(THREAD->is_Java_thread(), "must be a Java thread"); | |
195 bool do_resolve = false; | |
196 bool in_error = false; | |
197 | |
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198 // Create a handle for the mirror. This will preserve the resolved class |
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199 // until the loader_data is registered. |
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200 Handle mirror_handle; |
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201 |
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202 Symbol* name = NULL; |
0 | 203 Handle loader; |
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204 { MonitorLockerEx ml(this_oop->lock()); |
0 | 205 |
206 if (this_oop->tag_at(which).is_unresolved_klass()) { | |
207 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
208 in_error = true; | |
209 } else { | |
210 do_resolve = true; | |
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211 name = this_oop->unresolved_klass_at(which); |
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212 loader = Handle(THREAD, this_oop->pool_holder()->class_loader()); |
0 | 213 } |
214 } | |
215 } // unlocking constantPool | |
216 | |
217 | |
218 // The original attempt to resolve this constant pool entry failed so find the | |
219 // original error and throw it again (JVMS 5.4.3). | |
220 if (in_error) { | |
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221 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which); |
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222 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); |
0 | 223 ResourceMark rm; |
224 // exception text will be the class name | |
225 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
226 THROW_MSG_0(error, className); | |
227 } | |
228 | |
229 if (do_resolve) { | |
230 // this_oop must be unlocked during resolve_or_fail | |
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231 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 232 Handle h_prot (THREAD, protection_domain); |
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233 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD); |
0 | 234 KlassHandle k; |
235 if (!HAS_PENDING_EXCEPTION) { | |
236 k = KlassHandle(THREAD, k_oop); | |
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237 // preserve the resolved klass. |
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238 mirror_handle = Handle(THREAD, k_oop->java_mirror()); |
0 | 239 // Do access check for klasses |
240 verify_constant_pool_resolve(this_oop, k, THREAD); | |
241 } | |
242 | |
243 // Failed to resolve class. We must record the errors so that subsequent attempts | |
244 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). | |
245 if (HAS_PENDING_EXCEPTION) { | |
246 ResourceMark rm; | |
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247 Symbol* error = PENDING_EXCEPTION->klass()->name(); |
0 | 248 |
249 bool throw_orig_error = false; | |
250 { | |
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251 MonitorLockerEx ml(this_oop->lock()); |
0 | 252 |
253 // some other thread has beaten us and has resolved the class. | |
254 if (this_oop->tag_at(which).is_klass()) { | |
255 CLEAR_PENDING_EXCEPTION; | |
256 entry = this_oop->resolved_klass_at(which); | |
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257 return entry.get_klass(); |
0 | 258 } |
259 | |
260 if (!PENDING_EXCEPTION-> | |
1142 | 261 is_a(SystemDictionary::LinkageError_klass())) { |
0 | 262 // Just throw the exception and don't prevent these classes from |
263 // being loaded due to virtual machine errors like StackOverflow | |
264 // and OutOfMemoryError, etc, or if the thread was hit by stop() | |
265 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) | |
266 } | |
267 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
268 SystemDictionary::add_resolution_error(this_oop, which, error); | |
269 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError); | |
270 } else { | |
271 // some other thread has put the class in error state. | |
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272 error = SystemDictionary::find_resolution_error(this_oop, which); |
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273 assert(error != NULL, "checking"); |
0 | 274 throw_orig_error = true; |
275 } | |
276 } // unlocked | |
277 | |
278 if (throw_orig_error) { | |
279 CLEAR_PENDING_EXCEPTION; | |
280 ResourceMark rm; | |
281 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
282 THROW_MSG_0(error, className); | |
283 } | |
284 | |
285 return 0; | |
286 } | |
287 | |
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288 if (TraceClassResolution && !k()->oop_is_array()) { |
0 | 289 // skip resolving the constant pool so that this code get's |
290 // called the next time some bytecodes refer to this class. | |
291 ResourceMark rm; | |
292 int line_number = -1; | |
293 const char * source_file = NULL; | |
294 if (JavaThread::current()->has_last_Java_frame()) { | |
295 // try to identify the method which called this function. | |
296 vframeStream vfst(JavaThread::current()); | |
297 if (!vfst.at_end()) { | |
298 line_number = vfst.method()->line_number_from_bci(vfst.bci()); | |
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299 Symbol* s = vfst.method()->method_holder()->source_file_name(); |
0 | 300 if (s != NULL) { |
301 source_file = s->as_C_string(); | |
302 } | |
303 } | |
304 } | |
305 if (k() != this_oop->pool_holder()) { | |
306 // only print something if the classes are different | |
307 if (source_file != NULL) { | |
308 tty->print("RESOLVE %s %s %s:%d\n", | |
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309 this_oop->pool_holder()->external_name(), |
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310 InstanceKlass::cast(k())->external_name(), source_file, line_number); |
0 | 311 } else { |
312 tty->print("RESOLVE %s %s\n", | |
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313 this_oop->pool_holder()->external_name(), |
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314 InstanceKlass::cast(k())->external_name()); |
0 | 315 } |
316 } | |
317 return k(); | |
318 } else { | |
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319 MonitorLockerEx ml(this_oop->lock()); |
0 | 320 // Only updated constant pool - if it is resolved. |
321 do_resolve = this_oop->tag_at(which).is_unresolved_klass(); | |
322 if (do_resolve) { | |
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323 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data(); |
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324 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM |
0 | 325 this_oop->klass_at_put(which, k()); |
326 } | |
327 } | |
328 } | |
329 | |
330 entry = this_oop->resolved_klass_at(which); | |
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331 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); |
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332 return entry.get_klass(); |
0 | 333 } |
334 | |
335 | |
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336 // Does not update ConstantPool* - to avoid any exception throwing. Used |
0 | 337 // by compiler and exception handling. Also used to avoid classloads for |
338 // instanceof operations. Returns NULL if the class has not been loaded or | |
339 // if the verification of constant pool failed | |
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340 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) { |
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341 CPSlot entry = this_oop->slot_at(which); |
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342 if (entry.is_resolved()) { |
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343 assert(entry.get_klass()->is_klass(), "must be"); |
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344 return entry.get_klass(); |
0 | 345 } else { |
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346 assert(entry.is_unresolved(), "must be either symbol or klass"); |
0 | 347 Thread *thread = Thread::current(); |
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348 Symbol* name = entry.get_symbol(); |
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349 oop loader = this_oop->pool_holder()->class_loader(); |
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350 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 351 Handle h_prot (thread, protection_domain); |
352 Handle h_loader (thread, loader); | |
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353 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); |
0 | 354 |
355 if (k != NULL) { | |
356 // Make sure that resolving is legal | |
357 EXCEPTION_MARK; | |
358 KlassHandle klass(THREAD, k); | |
359 // return NULL if verification fails | |
360 verify_constant_pool_resolve(this_oop, klass, THREAD); | |
361 if (HAS_PENDING_EXCEPTION) { | |
362 CLEAR_PENDING_EXCEPTION; | |
363 return NULL; | |
364 } | |
365 return klass(); | |
366 } else { | |
367 return k; | |
368 } | |
369 } | |
370 } | |
371 | |
372 | |
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373 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) { |
0 | 374 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which)); |
375 } | |
376 | |
377 | |
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378 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool, |
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379 int which) { |
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380 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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381 int cache_index = decode_cpcache_index(which, true); |
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382 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { |
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383 // FIXME: should be an assert |
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384 if (PrintMiscellaneous && (Verbose||WizardMode)) { |
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385 tty->print_cr("bad operand %d in:", which); cpool->print(); |
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386 } |
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387 return NULL; |
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388 } |
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389 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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390 return e->method_if_resolved(cpool); |
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391 } |
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392 |
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393 |
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394 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) { |
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395 if (cpool->cache() == NULL) return false; // nothing to load yet |
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396 int cache_index = decode_cpcache_index(which, true); |
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397 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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398 return e->has_appendix(); |
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399 } |
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400 |
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401 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) { |
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402 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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403 int cache_index = decode_cpcache_index(which, true); |
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404 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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405 return e->appendix_if_resolved(cpool); |
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406 } |
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407 |
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408 |
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409 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) { |
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410 if (cpool->cache() == NULL) return false; // nothing to load yet |
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411 int cache_index = decode_cpcache_index(which, true); |
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412 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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413 return e->has_method_type(); |
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414 } |
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415 |
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416 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) { |
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417 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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418 int cache_index = decode_cpcache_index(which, true); |
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419 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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420 return e->method_type_if_resolved(cpool); |
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421 } |
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422 |
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423 |
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424 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { |
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425 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
0 | 426 return symbol_at(name_index); |
427 } | |
428 | |
429 | |
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430 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { |
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431 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
0 | 432 return symbol_at(signature_index); |
433 } | |
434 | |
435 | |
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436 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { |
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437 int i = which; |
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438 if (!uncached && cache() != NULL) { |
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439 if (ConstantPool::is_invokedynamic_index(which)) { |
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440 // Invokedynamic index is index into resolved_references |
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441 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); |
2460 | 442 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); |
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443 assert(tag_at(pool_index).is_name_and_type(), ""); |
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444 return pool_index; |
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445 } |
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446 // change byte-ordering and go via cache |
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447 i = remap_instruction_operand_from_cache(which); |
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448 } else { |
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449 if (tag_at(which).is_invoke_dynamic()) { |
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450 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); |
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451 assert(tag_at(pool_index).is_name_and_type(), ""); |
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452 return pool_index; |
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453 } |
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454 } |
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455 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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456 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); |
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457 jint ref_index = *int_at_addr(i); |
0 | 458 return extract_high_short_from_int(ref_index); |
459 } | |
460 | |
461 | |
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462 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { |
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463 guarantee(!ConstantPool::is_invokedynamic_index(which), |
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464 "an invokedynamic instruction does not have a klass"); |
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465 int i = which; |
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466 if (!uncached && cache() != NULL) { |
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467 // change byte-ordering and go via cache |
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468 i = remap_instruction_operand_from_cache(which); |
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469 } |
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470 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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471 jint ref_index = *int_at_addr(i); |
0 | 472 return extract_low_short_from_int(ref_index); |
473 } | |
474 | |
475 | |
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476 |
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477 int ConstantPool::remap_instruction_operand_from_cache(int operand) { |
1565 | 478 int cpc_index = operand; |
479 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); | |
480 assert((int)(u2)cpc_index == cpc_index, "clean u2"); | |
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481 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); |
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482 return member_index; |
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483 } |
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484 |
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485 |
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486 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) { |
0 | 487 if (k->oop_is_instance() || k->oop_is_objArray()) { |
488 instanceKlassHandle holder (THREAD, this_oop->pool_holder()); | |
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489 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); |
0 | 490 KlassHandle element (THREAD, elem_oop); |
491 | |
492 // The element type could be a typeArray - we only need the access check if it is | |
493 // an reference to another class | |
494 if (element->oop_is_instance()) { | |
495 LinkResolver::check_klass_accessability(holder, element, CHECK); | |
496 } | |
497 } | |
498 } | |
499 | |
500 | |
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501 int ConstantPool::name_ref_index_at(int which_nt) { |
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502 jint ref_index = name_and_type_at(which_nt); |
0 | 503 return extract_low_short_from_int(ref_index); |
504 } | |
505 | |
506 | |
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507 int ConstantPool::signature_ref_index_at(int which_nt) { |
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508 jint ref_index = name_and_type_at(which_nt); |
0 | 509 return extract_high_short_from_int(ref_index); |
510 } | |
511 | |
512 | |
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513 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { |
0 | 514 return klass_at(klass_ref_index_at(which), CHECK_NULL); |
515 } | |
516 | |
517 | |
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518 Symbol* ConstantPool::klass_name_at(int which) { |
0 | 519 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), |
520 "Corrupted constant pool"); | |
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521 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
0 | 522 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and |
523 // tag is not updated atomicly. | |
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524 CPSlot entry = slot_at(which); |
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525 if (entry.is_resolved()) { |
0 | 526 // Already resolved - return entry's name. |
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527 assert(entry.get_klass()->is_klass(), "must be"); |
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528 return entry.get_klass()->name(); |
0 | 529 } else { |
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530 assert(entry.is_unresolved(), "must be either symbol or klass"); |
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531 return entry.get_symbol(); |
0 | 532 } |
533 } | |
534 | |
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535 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { |
0 | 536 jint ref_index = klass_ref_index_at(which); |
537 return klass_at_noresolve(ref_index); | |
538 } | |
539 | |
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540 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { |
1602 | 541 jint ref_index = uncached_klass_ref_index_at(which); |
542 return klass_at_noresolve(ref_index); | |
543 } | |
544 | |
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545 char* ConstantPool::string_at_noresolve(int which) { |
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546 Symbol* s = unresolved_string_at(which); |
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547 if (s == NULL) { |
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548 return (char*)"<pseudo-string>"; |
0 | 549 } else { |
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550 return unresolved_string_at(which)->as_C_string(); |
0 | 551 } |
552 } | |
553 | |
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554 BasicType ConstantPool::basic_type_for_signature_at(int which) { |
0 | 555 return FieldType::basic_type(symbol_at(which)); |
556 } | |
557 | |
558 | |
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559 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) { |
0 | 560 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused |
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561 if (this_oop->tag_at(index).is_string()) { |
0 | 562 this_oop->string_at(index, CHECK); |
563 } | |
564 } | |
565 } | |
566 | |
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567 // Resolve all the classes in the constant pool. If they are all resolved, |
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568 // the constant pool is read-only. Enhancement: allocate cp entries to |
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569 // another metaspace, and copy to read-only or read-write space if this |
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570 // bit is set. |
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571 bool ConstantPool::resolve_class_constants(TRAPS) { |
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572 constantPoolHandle cp(THREAD, this); |
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573 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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574 if (tag_at(index).is_unresolved_klass() && |
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575 klass_at_if_loaded(cp, index) == NULL) { |
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576 return false; |
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577 } |
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578 } |
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579 // set_preresolution(); or some bit for future use |
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580 return true; |
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581 } |
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582 |
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583 // If resolution for MethodHandle or MethodType fails, save the exception |
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584 // in the resolution error table, so that the same exception is thrown again. |
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585 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which, |
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586 int tag, TRAPS) { |
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587 ResourceMark rm; |
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588 Symbol* error = PENDING_EXCEPTION->klass()->name(); |
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589 MonitorLockerEx ml(this_oop->lock()); // lock cpool to change tag. |
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590 |
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591 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ? |
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592 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError; |
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593 |
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594 if (!PENDING_EXCEPTION-> |
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595 is_a(SystemDictionary::LinkageError_klass())) { |
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596 // Just throw the exception and don't prevent these classes from |
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597 // being loaded due to virtual machine errors like StackOverflow |
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598 // and OutOfMemoryError, etc, or if the thread was hit by stop() |
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599 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) |
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600 |
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601 } else if (this_oop->tag_at(which).value() != error_tag) { |
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602 SystemDictionary::add_resolution_error(this_oop, which, error); |
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603 this_oop->tag_at_put(which, error_tag); |
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604 } else { |
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605 // some other thread has put the class in error state. |
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606 error = SystemDictionary::find_resolution_error(this_oop, which); |
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607 assert(error != NULL, "checking"); |
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608 CLEAR_PENDING_EXCEPTION; |
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609 THROW_MSG(error, ""); |
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610 } |
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611 } |
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612 |
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613 |
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614 // Called to resolve constants in the constant pool and return an oop. |
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615 // Some constant pool entries cache their resolved oop. This is also |
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616 // called to create oops from constants to use in arguments for invokedynamic |
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617 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) { |
1602 | 618 oop result_oop = NULL; |
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619 Handle throw_exception; |
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620 |
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621 if (cache_index == _possible_index_sentinel) { |
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622 // It is possible that this constant is one which is cached in the objects. |
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623 // We'll do a linear search. This should be OK because this usage is rare. |
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624 assert(index > 0, "valid index"); |
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625 cache_index = this_oop->cp_to_object_index(index); |
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626 } |
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627 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); |
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628 assert(index == _no_index_sentinel || index >= 0, ""); |
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629 |
1602 | 630 if (cache_index >= 0) { |
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631 result_oop = this_oop->resolved_references()->obj_at(cache_index); |
1602 | 632 if (result_oop != NULL) { |
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633 return result_oop; |
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634 // That was easy... |
1602 | 635 } |
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636 index = this_oop->object_to_cp_index(cache_index); |
1602 | 637 } |
638 | |
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639 jvalue prim_value; // temp used only in a few cases below |
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640 |
1602 | 641 int tag_value = this_oop->tag_at(index).value(); |
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642 |
1602 | 643 switch (tag_value) { |
644 | |
645 case JVM_CONSTANT_UnresolvedClass: | |
646 case JVM_CONSTANT_UnresolvedClassInError: | |
647 case JVM_CONSTANT_Class: | |
648 { | |
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649 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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650 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL); |
1602 | 651 // ldc wants the java mirror. |
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652 result_oop = resolved->java_mirror(); |
1602 | 653 break; |
654 } | |
655 | |
656 case JVM_CONSTANT_String: | |
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657 assert(cache_index != _no_index_sentinel, "should have been set"); |
1602 | 658 if (this_oop->is_pseudo_string_at(index)) { |
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659 result_oop = this_oop->pseudo_string_at(index, cache_index); |
1602 | 660 break; |
661 } | |
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662 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL); |
1602 | 663 break; |
664 | |
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665 case JVM_CONSTANT_MethodHandleInError: |
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666 case JVM_CONSTANT_MethodTypeInError: |
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667 { |
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668 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index); |
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669 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); |
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670 ResourceMark rm; |
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671 THROW_MSG_0(error, ""); |
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672 break; |
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673 } |
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674 |
1602 | 675 case JVM_CONSTANT_MethodHandle: |
676 { | |
677 int ref_kind = this_oop->method_handle_ref_kind_at(index); | |
678 int callee_index = this_oop->method_handle_klass_index_at(index); | |
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679 Symbol* name = this_oop->method_handle_name_ref_at(index); |
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680 Symbol* signature = this_oop->method_handle_signature_ref_at(index); |
1602 | 681 if (PrintMiscellaneous) |
682 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", | |
683 ref_kind, index, this_oop->method_handle_index_at(index), | |
684 callee_index, name->as_C_string(), signature->as_C_string()); | |
685 KlassHandle callee; | |
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686 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL); |
1602 | 687 callee = KlassHandle(THREAD, k); |
688 } | |
689 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
690 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, | |
691 callee, name, signature, | |
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692 THREAD); |
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693 result_oop = value(); |
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694 if (HAS_PENDING_EXCEPTION) { |
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695 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); |
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696 } |
1602 | 697 break; |
698 } | |
699 | |
700 case JVM_CONSTANT_MethodType: | |
701 { | |
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702 Symbol* signature = this_oop->method_type_signature_at(index); |
1602 | 703 if (PrintMiscellaneous) |
704 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", | |
705 index, this_oop->method_type_index_at(index), | |
706 signature->as_C_string()); | |
707 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
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708 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); |
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709 result_oop = value(); |
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710 if (HAS_PENDING_EXCEPTION) { |
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711 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); |
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712 } |
1602 | 713 break; |
714 } | |
715 | |
716 case JVM_CONSTANT_Integer: | |
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717 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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718 prim_value.i = this_oop->int_at(index); |
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719 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); |
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720 break; |
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721 |
1602 | 722 case JVM_CONSTANT_Float: |
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723 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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724 prim_value.f = this_oop->float_at(index); |
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725 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); |
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726 break; |
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|
727 |
1602 | 728 case JVM_CONSTANT_Long: |
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729 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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730 prim_value.j = this_oop->long_at(index); |
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731 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); |
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732 break; |
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733 |
1602 | 734 case JVM_CONSTANT_Double: |
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735 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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736 prim_value.d = this_oop->double_at(index); |
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737 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); |
1602 | 738 break; |
739 | |
740 default: | |
741 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", | |
742 this_oop(), index, cache_index, tag_value) ); | |
743 assert(false, "unexpected constant tag"); | |
744 break; | |
745 } | |
746 | |
747 if (cache_index >= 0) { | |
748 // Cache the oop here also. | |
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749 Handle result_handle(THREAD, result_oop); |
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750 MonitorLockerEx ml(this_oop->lock()); // don't know if we really need this |
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751 oop result = this_oop->resolved_references()->obj_at(cache_index); |
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752 // Benign race condition: resolved_references may already be filled in while we were trying to lock. |
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753 // The important thing here is that all threads pick up the same result. |
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754 // It doesn't matter which racing thread wins, as long as only one |
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755 // result is used by all threads, and all future queries. |
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756 // That result may be either a resolved constant or a failure exception. |
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757 if (result == NULL) { |
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758 this_oop->resolved_references()->obj_at_put(cache_index, result_handle()); |
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759 return result_handle(); |
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760 } else { |
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761 // Return the winning thread's result. This can be different than |
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762 // result_handle() for MethodHandles. |
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763 return result; |
1602 | 764 } |
765 } else { | |
766 return result_oop; | |
767 } | |
768 } | |
769 | |
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770 oop ConstantPool::uncached_string_at(int which, TRAPS) { |
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771 Symbol* sym = unresolved_string_at(which); |
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772 oop str = StringTable::intern(sym, CHECK_(NULL)); |
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773 assert(java_lang_String::is_instance(str), "must be string"); |
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774 return str; |
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775 } |
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776 |
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777 |
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778 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) { |
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779 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); |
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780 |
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781 Handle bsm; |
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782 int argc; |
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783 { |
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784 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments |
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785 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. |
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786 // It is accompanied by the optional arguments. |
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787 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index); |
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788 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); |
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789 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { |
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790 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); |
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791 } |
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792 |
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793 // Extract the optional static arguments. |
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794 argc = this_oop->invoke_dynamic_argument_count_at(index); |
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795 if (argc == 0) return bsm_oop; |
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796 |
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797 bsm = Handle(THREAD, bsm_oop); |
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798 } |
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799 |
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800 objArrayHandle info; |
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801 { |
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802 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); |
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803 info = objArrayHandle(THREAD, info_oop); |
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804 } |
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805 |
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806 info->obj_at_put(0, bsm()); |
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807 for (int i = 0; i < argc; i++) { |
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808 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i); |
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809 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); |
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810 info->obj_at_put(1+i, arg_oop); |
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811 } |
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812 |
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813 return info(); |
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814 } |
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815 |
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816 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) { |
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817 // If the string has already been interned, this entry will be non-null |
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818 oop str = this_oop->resolved_references()->obj_at(obj_index); |
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819 if (str != NULL) return str; |
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820 Symbol* sym = this_oop->unresolved_string_at(which); |
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821 str = StringTable::intern(sym, CHECK_(NULL)); |
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822 this_oop->string_at_put(which, obj_index, str); |
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823 assert(java_lang_String::is_instance(str), "must be string"); |
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824 return str; |
0 | 825 } |
826 | |
827 | |
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828 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, |
0 | 829 int which) { |
2177
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830 // Names are interned, so we can compare Symbol*s directly |
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831 Symbol* cp_name = klass_name_at(which); |
0 | 832 return (cp_name == k->name()); |
833 } | |
834 | |
835 | |
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836 // Iterate over symbols and decrement ones which are Symbol*s. |
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837 // This is done during GC so do not need to lock constantPool unless we |
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838 // have per-thread safepoints. |
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839 // Only decrement the UTF8 symbols. Unresolved classes and strings point to |
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840 // these symbols but didn't increment the reference count. |
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841 void ConstantPool::unreference_symbols() { |
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842 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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843 constantTag tag = tag_at(index); |
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844 if (tag.is_symbol()) { |
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845 symbol_at(index)->decrement_refcount(); |
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846 } |
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847 } |
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848 } |
0 | 849 |
850 | |
851 // Compare this constant pool's entry at index1 to the constant pool | |
852 // cp2's entry at index2. | |
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853 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2, |
0 | 854 int index2, TRAPS) { |
855 | |
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856 // The error tags are equivalent to non-error tags when comparing |
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857 jbyte t1 = tag_at(index1).non_error_value(); |
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858 jbyte t2 = cp2->tag_at(index2).non_error_value(); |
0 | 859 |
860 if (t1 != t2) { | |
861 // Not the same entry type so there is nothing else to check. Note | |
862 // that this style of checking will consider resolved/unresolved | |
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863 // class pairs as different. |
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864 // From the ConstantPool* API point of view, this is correct |
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865 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this |
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866 // plays out in the context of ConstantPool* merging. |
0 | 867 return false; |
868 } | |
869 | |
870 switch (t1) { | |
871 case JVM_CONSTANT_Class: | |
872 { | |
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873 Klass* k1 = klass_at(index1, CHECK_false); |
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874 Klass* k2 = cp2->klass_at(index2, CHECK_false); |
0 | 875 if (k1 == k2) { |
876 return true; | |
877 } | |
878 } break; | |
879 | |
880 case JVM_CONSTANT_ClassIndex: | |
881 { | |
882 int recur1 = klass_index_at(index1); | |
883 int recur2 = cp2->klass_index_at(index2); | |
884 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
885 if (match) { | |
886 return true; | |
887 } | |
888 } break; | |
889 | |
890 case JVM_CONSTANT_Double: | |
891 { | |
892 jdouble d1 = double_at(index1); | |
893 jdouble d2 = cp2->double_at(index2); | |
894 if (d1 == d2) { | |
895 return true; | |
896 } | |
897 } break; | |
898 | |
899 case JVM_CONSTANT_Fieldref: | |
900 case JVM_CONSTANT_InterfaceMethodref: | |
901 case JVM_CONSTANT_Methodref: | |
902 { | |
903 int recur1 = uncached_klass_ref_index_at(index1); | |
904 int recur2 = cp2->uncached_klass_ref_index_at(index2); | |
905 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
906 if (match) { | |
907 recur1 = uncached_name_and_type_ref_index_at(index1); | |
908 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); | |
909 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
910 if (match) { | |
911 return true; | |
912 } | |
913 } | |
914 } break; | |
915 | |
916 case JVM_CONSTANT_Float: | |
917 { | |
918 jfloat f1 = float_at(index1); | |
919 jfloat f2 = cp2->float_at(index2); | |
920 if (f1 == f2) { | |
921 return true; | |
922 } | |
923 } break; | |
924 | |
925 case JVM_CONSTANT_Integer: | |
926 { | |
927 jint i1 = int_at(index1); | |
928 jint i2 = cp2->int_at(index2); | |
929 if (i1 == i2) { | |
930 return true; | |
931 } | |
932 } break; | |
933 | |
934 case JVM_CONSTANT_Long: | |
935 { | |
936 jlong l1 = long_at(index1); | |
937 jlong l2 = cp2->long_at(index2); | |
938 if (l1 == l2) { | |
939 return true; | |
940 } | |
941 } break; | |
942 | |
943 case JVM_CONSTANT_NameAndType: | |
944 { | |
945 int recur1 = name_ref_index_at(index1); | |
946 int recur2 = cp2->name_ref_index_at(index2); | |
947 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
948 if (match) { | |
949 recur1 = signature_ref_index_at(index1); | |
950 recur2 = cp2->signature_ref_index_at(index2); | |
951 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
952 if (match) { | |
953 return true; | |
954 } | |
955 } | |
956 } break; | |
957 | |
958 case JVM_CONSTANT_StringIndex: | |
959 { | |
960 int recur1 = string_index_at(index1); | |
961 int recur2 = cp2->string_index_at(index2); | |
962 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
963 if (match) { | |
964 return true; | |
965 } | |
966 } break; | |
967 | |
968 case JVM_CONSTANT_UnresolvedClass: | |
969 { | |
2177
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970 Symbol* k1 = unresolved_klass_at(index1); |
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971 Symbol* k2 = cp2->unresolved_klass_at(index2); |
0 | 972 if (k1 == k2) { |
973 return true; | |
974 } | |
975 } break; | |
976 | |
1602 | 977 case JVM_CONSTANT_MethodType: |
978 { | |
12845
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979 int k1 = method_type_index_at_error_ok(index1); |
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980 int k2 = cp2->method_type_index_at_error_ok(index2); |
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981 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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982 if (match) { |
1602 | 983 return true; |
984 } | |
985 } break; | |
986 | |
987 case JVM_CONSTANT_MethodHandle: | |
988 { | |
12845
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989 int k1 = method_handle_ref_kind_at_error_ok(index1); |
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990 int k2 = cp2->method_handle_ref_kind_at_error_ok(index2); |
1602 | 991 if (k1 == k2) { |
12845
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992 int i1 = method_handle_index_at_error_ok(index1); |
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993 int i2 = cp2->method_handle_index_at_error_ok(index2); |
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994 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); |
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995 if (match) { |
1602 | 996 return true; |
997 } | |
998 } | |
999 } break; | |
1000 | |
1660
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1001 case JVM_CONSTANT_InvokeDynamic: |
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1002 { |
10151
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1003 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); |
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1004 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); |
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1005 int i1 = invoke_dynamic_bootstrap_specifier_index(index1); |
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1006 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); |
10350 | 1007 // separate statements and variables because CHECK_false is used |
1008 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); | |
1009 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); | |
1010 return (match_entry && match_operand); | |
1660
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1011 } break; |
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1012 |
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1013 case JVM_CONSTANT_String: |
0 | 1014 { |
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1015 Symbol* s1 = unresolved_string_at(index1); |
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1016 Symbol* s2 = cp2->unresolved_string_at(index2); |
0 | 1017 if (s1 == s2) { |
1018 return true; | |
1019 } | |
1020 } break; | |
1021 | |
1022 case JVM_CONSTANT_Utf8: | |
1023 { | |
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1024 Symbol* s1 = symbol_at(index1); |
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1025 Symbol* s2 = cp2->symbol_at(index2); |
0 | 1026 if (s1 == s2) { |
1027 return true; | |
1028 } | |
1029 } break; | |
1030 | |
1031 // Invalid is used as the tag for the second constant pool entry | |
1032 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1033 // not be seen by itself. | |
1034 case JVM_CONSTANT_Invalid: // fall through | |
1035 | |
1036 default: | |
1037 ShouldNotReachHere(); | |
1038 break; | |
1039 } | |
1040 | |
1041 return false; | |
1042 } // end compare_entry_to() | |
1043 | |
1044 | |
10151
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1045 // Resize the operands array with delta_len and delta_size. |
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1046 // Used in RedefineClasses for CP merge. |
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1047 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { |
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1048 int old_len = operand_array_length(operands()); |
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1049 int new_len = old_len + delta_len; |
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1050 int min_len = (delta_len > 0) ? old_len : new_len; |
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1051 |
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1052 int old_size = operands()->length(); |
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1053 int new_size = old_size + delta_size; |
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1054 int min_size = (delta_size > 0) ? old_size : new_size; |
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1055 |
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1056 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
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1057 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); |
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1058 |
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1059 // Set index in the resized array for existing elements only |
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1060 for (int idx = 0; idx < min_len; idx++) { |
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1061 int offset = operand_offset_at(idx); // offset in original array |
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1062 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array |
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1063 } |
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1064 // Copy the bootstrap specifiers only |
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1065 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), |
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1066 new_ops->adr_at(2*new_len), |
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1067 (min_size - 2*min_len) * sizeof(u2)); |
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1068 // Explicitly deallocate old operands array. |
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1069 // Note, it is not needed for 7u backport. |
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1070 if ( operands() != NULL) { // the safety check |
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1071 MetadataFactory::free_array<u2>(loader_data, operands()); |
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1072 } |
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1073 set_operands(new_ops); |
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1074 } // end resize_operands() |
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1075 |
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1076 |
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1077 // Extend the operands array with the length and size of the ext_cp operands. |
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1078 // Used in RedefineClasses for CP merge. |
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1079 void ConstantPool::extend_operands(constantPoolHandle ext_cp, TRAPS) { |
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1080 int delta_len = operand_array_length(ext_cp->operands()); |
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1081 if (delta_len == 0) { |
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1082 return; // nothing to do |
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1083 } |
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1084 int delta_size = ext_cp->operands()->length(); |
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1085 |
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1086 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); |
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1087 |
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1088 if (operand_array_length(operands()) == 0) { |
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1089 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
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1090 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); |
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1091 // The first element index defines the offset of second part |
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1092 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array |
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1093 set_operands(new_ops); |
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1094 } else { |
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1095 resize_operands(delta_len, delta_size, CHECK); |
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1096 } |
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1097 |
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1098 } // end extend_operands() |
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1099 |
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1100 |
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1101 // Shrink the operands array to a smaller array with new_len length. |
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1102 // Used in RedefineClasses for CP merge. |
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1103 void ConstantPool::shrink_operands(int new_len, TRAPS) { |
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1104 int old_len = operand_array_length(operands()); |
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1105 if (new_len == old_len) { |
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1106 return; // nothing to do |
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1107 } |
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1108 assert(new_len < old_len, "shrunken operands array must be smaller"); |
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1109 |
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1110 int free_base = operand_next_offset_at(new_len - 1); |
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1111 int delta_len = new_len - old_len; |
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1112 int delta_size = 2*delta_len + free_base - operands()->length(); |
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1113 |
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1114 resize_operands(delta_len, delta_size, CHECK); |
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1115 |
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1116 } // end shrink_operands() |
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1117 |
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1118 |
7952
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1119 void ConstantPool::copy_operands(constantPoolHandle from_cp, |
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1120 constantPoolHandle to_cp, |
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1121 TRAPS) { |
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1122 |
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1123 int from_oplen = operand_array_length(from_cp->operands()); |
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1124 int old_oplen = operand_array_length(to_cp->operands()); |
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1125 if (from_oplen != 0) { |
6934 | 1126 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); |
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1127 // append my operands to the target's operands array |
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1128 if (old_oplen == 0) { |
6934 | 1129 // Can't just reuse from_cp's operand list because of deallocation issues |
1130 int len = from_cp->operands()->length(); | |
1131 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); | |
1132 Copy::conjoint_memory_atomic( | |
1133 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); | |
1134 to_cp->set_operands(new_ops); | |
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1135 } else { |
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1136 int old_len = to_cp->operands()->length(); |
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1137 int from_len = from_cp->operands()->length(); |
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1138 int old_off = old_oplen * sizeof(u2); |
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1139 int from_off = from_oplen * sizeof(u2); |
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1140 // Use the metaspace for the destination constant pool |
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1141 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); |
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1142 int fillp = 0, len = 0; |
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1143 // first part of dest |
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1144 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), |
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1145 new_operands->adr_at(fillp), |
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1146 (len = old_off) * sizeof(u2)); |
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1147 fillp += len; |
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1148 // first part of src |
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1149 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), |
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1150 new_operands->adr_at(fillp), |
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1151 (len = from_off) * sizeof(u2)); |
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1152 fillp += len; |
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1153 // second part of dest |
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1154 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), |
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1155 new_operands->adr_at(fillp), |
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1156 (len = old_len - old_off) * sizeof(u2)); |
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1157 fillp += len; |
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1158 // second part of src |
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1159 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), |
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1160 new_operands->adr_at(fillp), |
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1161 (len = from_len - from_off) * sizeof(u2)); |
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1162 fillp += len; |
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1163 assert(fillp == new_operands->length(), ""); |
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1164 |
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1165 // Adjust indexes in the first part of the copied operands array. |
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1166 for (int j = 0; j < from_oplen; j++) { |
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1167 int offset = operand_offset_at(new_operands, old_oplen + j); |
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1168 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); |
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1169 offset += old_len; // every new tuple is preceded by old_len extra u2's |
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1170 operand_offset_at_put(new_operands, old_oplen + j, offset); |
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1171 } |
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1172 |
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1173 // replace target operands array with combined array |
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1174 to_cp->set_operands(new_operands); |
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1175 } |
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1176 } |
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1177 } // end copy_operands() |
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1178 |
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1179 |
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1180 // Copy this constant pool's entries at start_i to end_i (inclusive) |
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1181 // to the constant pool to_cp's entries starting at to_i. A total of |
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1182 // (end_i - start_i) + 1 entries are copied. |
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1183 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, |
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1184 constantPoolHandle to_cp, int to_i, TRAPS) { |
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1185 |
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1186 |
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1187 int dest_i = to_i; // leave original alone for debug purposes |
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1188 |
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1189 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { |
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1190 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); |
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1191 |
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1192 switch (from_cp->tag_at(src_i).value()) { |
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1193 case JVM_CONSTANT_Double: |
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1194 case JVM_CONSTANT_Long: |
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1195 // double and long take two constant pool entries |
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1196 src_i += 2; |
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1197 dest_i += 2; |
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1198 break; |
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1199 |
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1200 default: |
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1201 // all others take one constant pool entry |
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1202 src_i++; |
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1203 dest_i++; |
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1204 break; |
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1205 } |
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1206 } |
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1207 copy_operands(from_cp, to_cp, CHECK); |
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1208 |
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1209 } // end copy_cp_to_impl() |
0 | 1210 |
1211 | |
1212 // Copy this constant pool's entry at from_i to the constant pool | |
1213 // to_cp's entry at to_i. | |
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1214 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i, |
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1215 constantPoolHandle to_cp, int to_i, |
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1216 TRAPS) { |
0 | 1217 |
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1218 int tag = from_cp->tag_at(from_i).value(); |
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1219 switch (tag) { |
0 | 1220 case JVM_CONSTANT_Class: |
1221 { | |
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1222 Klass* k = from_cp->klass_at(from_i, CHECK); |
0 | 1223 to_cp->klass_at_put(to_i, k); |
1224 } break; | |
1225 | |
1226 case JVM_CONSTANT_ClassIndex: | |
1227 { | |
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1228 jint ki = from_cp->klass_index_at(from_i); |
0 | 1229 to_cp->klass_index_at_put(to_i, ki); |
1230 } break; | |
1231 | |
1232 case JVM_CONSTANT_Double: | |
1233 { | |
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changeset
|
1234 jdouble d = from_cp->double_at(from_i); |
0 | 1235 to_cp->double_at_put(to_i, d); |
1236 // double takes two constant pool entries so init second entry's tag | |
1237 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1238 } break; | |
1239 | |
1240 case JVM_CONSTANT_Fieldref: | |
1241 { | |
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|
1242 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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|
1243 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1244 to_cp->field_at_put(to_i, class_index, name_and_type_index); |
1245 } break; | |
1246 | |
1247 case JVM_CONSTANT_Float: | |
1248 { | |
2011
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changeset
|
1249 jfloat f = from_cp->float_at(from_i); |
0 | 1250 to_cp->float_at_put(to_i, f); |
1251 } break; | |
1252 | |
1253 case JVM_CONSTANT_Integer: | |
1254 { | |
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|
1255 jint i = from_cp->int_at(from_i); |
0 | 1256 to_cp->int_at_put(to_i, i); |
1257 } break; | |
1258 | |
1259 case JVM_CONSTANT_InterfaceMethodref: | |
1260 { | |
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1261 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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|
1262 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1263 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); |
1264 } break; | |
1265 | |
1266 case JVM_CONSTANT_Long: | |
1267 { | |
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|
1268 jlong l = from_cp->long_at(from_i); |
0 | 1269 to_cp->long_at_put(to_i, l); |
1270 // long takes two constant pool entries so init second entry's tag | |
1271 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1272 } break; | |
1273 | |
1274 case JVM_CONSTANT_Methodref: | |
1275 { | |
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1276 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1277 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1278 to_cp->method_at_put(to_i, class_index, name_and_type_index); |
1279 } break; | |
1280 | |
1281 case JVM_CONSTANT_NameAndType: | |
1282 { | |
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1283 int name_ref_index = from_cp->name_ref_index_at(from_i); |
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|
1284 int signature_ref_index = from_cp->signature_ref_index_at(from_i); |
0 | 1285 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); |
1286 } break; | |
1287 | |
1288 case JVM_CONSTANT_StringIndex: | |
1289 { | |
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|
1290 jint si = from_cp->string_index_at(from_i); |
0 | 1291 to_cp->string_index_at_put(to_i, si); |
1292 } break; | |
1293 | |
1294 case JVM_CONSTANT_UnresolvedClass: | |
1295 { | |
2332
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|
1296 // Can be resolved after checking tag, so check the slot first. |
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changeset
|
1297 CPSlot entry = from_cp->slot_at(from_i); |
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1298 if (entry.is_resolved()) { |
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1299 assert(entry.get_klass()->is_klass(), "must be"); |
2332
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coleenp
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|
1300 // Already resolved |
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1301 to_cp->klass_at_put(to_i, entry.get_klass()); |
2332
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|
1302 } else { |
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|
1303 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); |
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6512830: Error: assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool")
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|
1304 } |
0 | 1305 } break; |
1306 | |
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1307 case JVM_CONSTANT_String: |
0 | 1308 { |
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1309 Symbol* s = from_cp->unresolved_string_at(from_i); |
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1310 to_cp->unresolved_string_at_put(to_i, s); |
0 | 1311 } break; |
1312 | |
1313 case JVM_CONSTANT_Utf8: | |
1314 { | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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diff
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|
1315 Symbol* s = from_cp->symbol_at(from_i); |
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1316 // Need to increase refcount, the old one will be thrown away and deferenced |
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1317 s->increment_refcount(); |
0 | 1318 to_cp->symbol_at_put(to_i, s); |
1319 } break; | |
1320 | |
1602 | 1321 case JVM_CONSTANT_MethodType: |
12845
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diff
changeset
|
1322 case JVM_CONSTANT_MethodTypeInError: |
1602 | 1323 { |
12845
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coleenp
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12316
diff
changeset
|
1324 jint k = from_cp->method_type_index_at_error_ok(from_i); |
1602 | 1325 to_cp->method_type_index_at_put(to_i, k); |
1326 } break; | |
1327 | |
1328 case JVM_CONSTANT_MethodHandle: | |
12845
b4a4fdc1f464
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coleenp
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changeset
|
1329 case JVM_CONSTANT_MethodHandleInError: |
1602 | 1330 { |
12845
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8025185: MethodHandleInError and MethodTypeInError not handled in ConstantPool::compare_entry_to and copy_entry_to
coleenp
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12316
diff
changeset
|
1331 int k1 = from_cp->method_handle_ref_kind_at_error_ok(from_i); |
b4a4fdc1f464
8025185: MethodHandleInError and MethodTypeInError not handled in ConstantPool::compare_entry_to and copy_entry_to
coleenp
parents:
12316
diff
changeset
|
1332 int k2 = from_cp->method_handle_index_at_error_ok(from_i); |
1602 | 1333 to_cp->method_handle_index_at_put(to_i, k1, k2); |
1334 } break; | |
1335 | |
1660
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6964498: JSR 292 invokedynamic sites need local bootstrap methods
jrose
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1602
diff
changeset
|
1336 case JVM_CONSTANT_InvokeDynamic: |
083fde3b838e
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1602
diff
changeset
|
1337 { |
2011
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diff
changeset
|
1338 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); |
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diff
changeset
|
1339 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); |
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|
1340 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands |
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changeset
|
1341 to_cp->invoke_dynamic_at_put(to_i, k1, k2); |
1660
083fde3b838e
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jrose
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1602
diff
changeset
|
1342 } break; |
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1602
diff
changeset
|
1343 |
0 | 1344 // Invalid is used as the tag for the second constant pool entry |
1345 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1346 // not be seen by itself. | |
1347 case JVM_CONSTANT_Invalid: // fall through | |
1348 | |
1349 default: | |
1350 { | |
1351 ShouldNotReachHere(); | |
1352 } break; | |
1353 } | |
1354 } // end copy_entry_to() | |
1355 | |
1356 | |
1357 // Search constant pool search_cp for an entry that matches this | |
1358 // constant pool's entry at pattern_i. Returns the index of a | |
1359 // matching entry or zero (0) if there is no matching entry. | |
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1360 int ConstantPool::find_matching_entry(int pattern_i, |
0 | 1361 constantPoolHandle search_cp, TRAPS) { |
1362 | |
1363 // index zero (0) is not used | |
1364 for (int i = 1; i < search_cp->length(); i++) { | |
1365 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); | |
1366 if (found) { | |
1367 return i; | |
1368 } | |
1369 } | |
1370 | |
1371 return 0; // entry not found; return unused index zero (0) | |
1372 } // end find_matching_entry() | |
1373 | |
1374 | |
10151
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1375 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool |
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1376 // cp2's bootstrap specifier at idx2. |
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1377 bool ConstantPool::compare_operand_to(int idx1, constantPoolHandle cp2, int idx2, TRAPS) { |
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1378 int k1 = operand_bootstrap_method_ref_index_at(idx1); |
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1379 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); |
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1380 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1381 |
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1382 if (!match) { |
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1383 return false; |
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1384 } |
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1385 int argc = operand_argument_count_at(idx1); |
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1386 if (argc == cp2->operand_argument_count_at(idx2)) { |
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1387 for (int j = 0; j < argc; j++) { |
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1388 k1 = operand_argument_index_at(idx1, j); |
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1389 k2 = cp2->operand_argument_index_at(idx2, j); |
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1390 match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1391 if (!match) { |
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1392 return false; |
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1393 } |
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1394 } |
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1395 return true; // got through loop; all elements equal |
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1396 } |
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1397 return false; |
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1398 } // end compare_operand_to() |
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1399 |
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1400 // Search constant pool search_cp for a bootstrap specifier that matches |
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1401 // this constant pool's bootstrap specifier at pattern_i index. |
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1402 // Return the index of a matching bootstrap specifier or (-1) if there is no match. |
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1403 int ConstantPool::find_matching_operand(int pattern_i, |
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1404 constantPoolHandle search_cp, int search_len, TRAPS) { |
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1405 for (int i = 0; i < search_len; i++) { |
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1406 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); |
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1407 if (found) { |
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1408 return i; |
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1409 } |
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1410 } |
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1411 return -1; // bootstrap specifier not found; return unused index (-1) |
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1412 } // end find_matching_operand() |
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1413 |
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1414 |
0 | 1415 #ifndef PRODUCT |
1416 | |
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1417 const char* ConstantPool::printable_name_at(int which) { |
0 | 1418 |
1419 constantTag tag = tag_at(which); | |
1420 | |
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1421 if (tag.is_string()) { |
0 | 1422 return string_at_noresolve(which); |
1423 } else if (tag.is_klass() || tag.is_unresolved_klass()) { | |
1424 return klass_name_at(which)->as_C_string(); | |
1425 } else if (tag.is_symbol()) { | |
1426 return symbol_at(which)->as_C_string(); | |
1427 } | |
1428 return ""; | |
1429 } | |
1430 | |
1431 #endif // PRODUCT | |
1432 | |
1433 | |
1434 // JVMTI GetConstantPool support | |
1435 | |
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1436 // For debugging of constant pool |
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1437 const bool debug_cpool = false; |
0 | 1438 |
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1439 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) |
0 | 1440 |
1441 static void print_cpool_bytes(jint cnt, u1 *bytes) { | |
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1442 const char* WARN_MSG = "Must not be such entry!"; |
0 | 1443 jint size = 0; |
1444 u2 idx1, idx2; | |
1445 | |
1446 for (jint idx = 1; idx < cnt; idx++) { | |
1447 jint ent_size = 0; | |
1448 u1 tag = *bytes++; | |
1449 size++; // count tag | |
1450 | |
1451 printf("const #%03d, tag: %02d ", idx, tag); | |
1452 switch(tag) { | |
1453 case JVM_CONSTANT_Invalid: { | |
1454 printf("Invalid"); | |
1455 break; | |
1456 } | |
1457 case JVM_CONSTANT_Unicode: { | |
1458 printf("Unicode %s", WARN_MSG); | |
1459 break; | |
1460 } | |
1461 case JVM_CONSTANT_Utf8: { | |
1462 u2 len = Bytes::get_Java_u2(bytes); | |
1463 char str[128]; | |
1464 if (len > 127) { | |
1465 len = 127; | |
1466 } | |
1467 strncpy(str, (char *) (bytes+2), len); | |
1468 str[len] = '\0'; | |
1469 printf("Utf8 \"%s\"", str); | |
1470 ent_size = 2 + len; | |
1471 break; | |
1472 } | |
1473 case JVM_CONSTANT_Integer: { | |
1474 u4 val = Bytes::get_Java_u4(bytes); | |
1475 printf("int %d", *(int *) &val); | |
1476 ent_size = 4; | |
1477 break; | |
1478 } | |
1479 case JVM_CONSTANT_Float: { | |
1480 u4 val = Bytes::get_Java_u4(bytes); | |
1481 printf("float %5.3ff", *(float *) &val); | |
1482 ent_size = 4; | |
1483 break; | |
1484 } | |
1485 case JVM_CONSTANT_Long: { | |
1486 u8 val = Bytes::get_Java_u8(bytes); | |
3960 | 1487 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val); |
0 | 1488 ent_size = 8; |
1489 idx++; // Long takes two cpool slots | |
1490 break; | |
1491 } | |
1492 case JVM_CONSTANT_Double: { | |
1493 u8 val = Bytes::get_Java_u8(bytes); | |
1494 printf("double %5.3fd", *(jdouble *)&val); | |
1495 ent_size = 8; | |
1496 idx++; // Double takes two cpool slots | |
1497 break; | |
1498 } | |
1499 case JVM_CONSTANT_Class: { | |
1500 idx1 = Bytes::get_Java_u2(bytes); | |
1501 printf("class #%03d", idx1); | |
1502 ent_size = 2; | |
1503 break; | |
1504 } | |
1505 case JVM_CONSTANT_String: { | |
1506 idx1 = Bytes::get_Java_u2(bytes); | |
1507 printf("String #%03d", idx1); | |
1508 ent_size = 2; | |
1509 break; | |
1510 } | |
1511 case JVM_CONSTANT_Fieldref: { | |
1512 idx1 = Bytes::get_Java_u2(bytes); | |
1513 idx2 = Bytes::get_Java_u2(bytes+2); | |
1514 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); | |
1515 ent_size = 4; | |
1516 break; | |
1517 } | |
1518 case JVM_CONSTANT_Methodref: { | |
1519 idx1 = Bytes::get_Java_u2(bytes); | |
1520 idx2 = Bytes::get_Java_u2(bytes+2); | |
1521 printf("Method #%03d, #%03d", idx1, idx2); | |
1522 ent_size = 4; | |
1523 break; | |
1524 } | |
1525 case JVM_CONSTANT_InterfaceMethodref: { | |
1526 idx1 = Bytes::get_Java_u2(bytes); | |
1527 idx2 = Bytes::get_Java_u2(bytes+2); | |
1528 printf("InterfMethod #%03d, #%03d", idx1, idx2); | |
1529 ent_size = 4; | |
1530 break; | |
1531 } | |
1532 case JVM_CONSTANT_NameAndType: { | |
1533 idx1 = Bytes::get_Java_u2(bytes); | |
1534 idx2 = Bytes::get_Java_u2(bytes+2); | |
1535 printf("NameAndType #%03d, #%03d", idx1, idx2); | |
1536 ent_size = 4; | |
1537 break; | |
1538 } | |
1539 case JVM_CONSTANT_ClassIndex: { | |
1540 printf("ClassIndex %s", WARN_MSG); | |
1541 break; | |
1542 } | |
1543 case JVM_CONSTANT_UnresolvedClass: { | |
1544 printf("UnresolvedClass: %s", WARN_MSG); | |
1545 break; | |
1546 } | |
1547 case JVM_CONSTANT_UnresolvedClassInError: { | |
1548 printf("UnresolvedClassInErr: %s", WARN_MSG); | |
1549 break; | |
1550 } | |
1551 case JVM_CONSTANT_StringIndex: { | |
1552 printf("StringIndex: %s", WARN_MSG); | |
1553 break; | |
1554 } | |
1555 } | |
1556 printf(";\n"); | |
1557 bytes += ent_size; | |
1558 size += ent_size; | |
1559 } | |
1560 printf("Cpool size: %d\n", size); | |
1561 fflush(0); | |
1562 return; | |
1563 } /* end print_cpool_bytes */ | |
1564 | |
1565 | |
1566 // Returns size of constant pool entry. | |
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1567 jint ConstantPool::cpool_entry_size(jint idx) { |
0 | 1568 switch(tag_at(idx).value()) { |
1569 case JVM_CONSTANT_Invalid: | |
1570 case JVM_CONSTANT_Unicode: | |
1571 return 1; | |
1572 | |
1573 case JVM_CONSTANT_Utf8: | |
1574 return 3 + symbol_at(idx)->utf8_length(); | |
1575 | |
1576 case JVM_CONSTANT_Class: | |
1577 case JVM_CONSTANT_String: | |
1578 case JVM_CONSTANT_ClassIndex: | |
1579 case JVM_CONSTANT_UnresolvedClass: | |
1580 case JVM_CONSTANT_UnresolvedClassInError: | |
1581 case JVM_CONSTANT_StringIndex: | |
1602 | 1582 case JVM_CONSTANT_MethodType: |
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1583 case JVM_CONSTANT_MethodTypeInError: |
0 | 1584 return 3; |
1585 | |
1602 | 1586 case JVM_CONSTANT_MethodHandle: |
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1587 case JVM_CONSTANT_MethodHandleInError: |
1602 | 1588 return 4; //tag, ref_kind, ref_index |
1589 | |
0 | 1590 case JVM_CONSTANT_Integer: |
1591 case JVM_CONSTANT_Float: | |
1592 case JVM_CONSTANT_Fieldref: | |
1593 case JVM_CONSTANT_Methodref: | |
1594 case JVM_CONSTANT_InterfaceMethodref: | |
1595 case JVM_CONSTANT_NameAndType: | |
1913
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1596 return 5; |
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1597 |
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1598 case JVM_CONSTANT_InvokeDynamic: |
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1599 // u1 tag, u2 bsm, u2 nt |
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1600 return 5; |
0 | 1601 |
1602 case JVM_CONSTANT_Long: | |
1603 case JVM_CONSTANT_Double: | |
1604 return 9; | |
1605 } | |
1606 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); | |
1607 return 1; | |
1608 } /* end cpool_entry_size */ | |
1609 | |
1610 | |
1611 // SymbolHashMap is used to find a constant pool index from a string. | |
1612 // This function fills in SymbolHashMaps, one for utf8s and one for | |
1613 // class names, returns size of the cpool raw bytes. | |
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1614 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, |
0 | 1615 SymbolHashMap *classmap) { |
1616 jint size = 0; | |
1617 | |
1618 for (u2 idx = 1; idx < length(); idx++) { | |
1619 u2 tag = tag_at(idx).value(); | |
1620 size += cpool_entry_size(idx); | |
1621 | |
1622 switch(tag) { | |
1623 case JVM_CONSTANT_Utf8: { | |
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1624 Symbol* sym = symbol_at(idx); |
0 | 1625 symmap->add_entry(sym, idx); |
1626 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); | |
1627 break; | |
1628 } | |
1629 case JVM_CONSTANT_Class: | |
1630 case JVM_CONSTANT_UnresolvedClass: | |
1631 case JVM_CONSTANT_UnresolvedClassInError: { | |
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1632 Symbol* sym = klass_name_at(idx); |
0 | 1633 classmap->add_entry(sym, idx); |
1634 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); | |
1635 break; | |
1636 } | |
1637 case JVM_CONSTANT_Long: | |
1638 case JVM_CONSTANT_Double: { | |
1639 idx++; // Both Long and Double take two cpool slots | |
1640 break; | |
1641 } | |
1642 } | |
1643 } | |
1644 return size; | |
1645 } /* end hash_utf8_entries_to */ | |
1646 | |
1647 | |
1648 // Copy cpool bytes. | |
1649 // Returns: | |
1650 // 0, in case of OutOfMemoryError | |
1651 // -1, in case of internal error | |
1652 // > 0, count of the raw cpool bytes that have been copied | |
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1653 int ConstantPool::copy_cpool_bytes(int cpool_size, |
0 | 1654 SymbolHashMap* tbl, |
1655 unsigned char *bytes) { | |
1656 u2 idx1, idx2; | |
1657 jint size = 0; | |
1658 jint cnt = length(); | |
1659 unsigned char *start_bytes = bytes; | |
1660 | |
1661 for (jint idx = 1; idx < cnt; idx++) { | |
1662 u1 tag = tag_at(idx).value(); | |
1663 jint ent_size = cpool_entry_size(idx); | |
1664 | |
1665 assert(size + ent_size <= cpool_size, "Size mismatch"); | |
1666 | |
1667 *bytes = tag; | |
1668 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); | |
1669 switch(tag) { | |
1670 case JVM_CONSTANT_Invalid: { | |
1671 DBG(printf("JVM_CONSTANT_Invalid")); | |
1672 break; | |
1673 } | |
1674 case JVM_CONSTANT_Unicode: { | |
1675 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); | |
1676 DBG(printf("JVM_CONSTANT_Unicode")); | |
1677 break; | |
1678 } | |
1679 case JVM_CONSTANT_Utf8: { | |
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1680 Symbol* sym = symbol_at(idx); |
0 | 1681 char* str = sym->as_utf8(); |
1682 // Warning! It's crashing on x86 with len = sym->utf8_length() | |
1683 int len = (int) strlen(str); | |
1684 Bytes::put_Java_u2((address) (bytes+1), (u2) len); | |
1685 for (int i = 0; i < len; i++) { | |
1686 bytes[3+i] = (u1) str[i]; | |
1687 } | |
1688 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); | |
1689 break; | |
1690 } | |
1691 case JVM_CONSTANT_Integer: { | |
1692 jint val = int_at(idx); | |
1693 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1694 break; | |
1695 } | |
1696 case JVM_CONSTANT_Float: { | |
1697 jfloat val = float_at(idx); | |
1698 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1699 break; | |
1700 } | |
1701 case JVM_CONSTANT_Long: { | |
1702 jlong val = long_at(idx); | |
1703 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1704 idx++; // Long takes two cpool slots | |
1705 break; | |
1706 } | |
1707 case JVM_CONSTANT_Double: { | |
1708 jdouble val = double_at(idx); | |
1709 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1710 idx++; // Double takes two cpool slots | |
1711 break; | |
1712 } | |
1713 case JVM_CONSTANT_Class: | |
1714 case JVM_CONSTANT_UnresolvedClass: | |
1715 case JVM_CONSTANT_UnresolvedClassInError: { | |
1716 *bytes = JVM_CONSTANT_Class; | |
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1717 Symbol* sym = klass_name_at(idx); |
0 | 1718 idx1 = tbl->symbol_to_value(sym); |
1719 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1720 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1721 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); | |
1722 break; | |
1723 } | |
1724 case JVM_CONSTANT_String: { | |
1725 *bytes = JVM_CONSTANT_String; | |
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1726 Symbol* sym = unresolved_string_at(idx); |
0 | 1727 idx1 = tbl->symbol_to_value(sym); |
1728 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1729 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
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1730 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); |
0 | 1731 break; |
1732 } | |
1733 case JVM_CONSTANT_Fieldref: | |
1734 case JVM_CONSTANT_Methodref: | |
1735 case JVM_CONSTANT_InterfaceMethodref: { | |
1736 idx1 = uncached_klass_ref_index_at(idx); | |
1737 idx2 = uncached_name_and_type_ref_index_at(idx); | |
1738 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1739 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1740 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); | |
1741 break; | |
1742 } | |
1743 case JVM_CONSTANT_NameAndType: { | |
1744 idx1 = name_ref_index_at(idx); | |
1745 idx2 = signature_ref_index_at(idx); | |
1746 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1747 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1748 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); | |
1749 break; | |
1750 } | |
1751 case JVM_CONSTANT_ClassIndex: { | |
1752 *bytes = JVM_CONSTANT_Class; | |
1753 idx1 = klass_index_at(idx); | |
1754 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1755 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); | |
1756 break; | |
1757 } | |
1758 case JVM_CONSTANT_StringIndex: { | |
1759 *bytes = JVM_CONSTANT_String; | |
1760 idx1 = string_index_at(idx); | |
1761 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1762 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); | |
1763 break; | |
1764 } | |
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1765 case JVM_CONSTANT_MethodHandle: |
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1766 case JVM_CONSTANT_MethodHandleInError: { |
1602 | 1767 *bytes = JVM_CONSTANT_MethodHandle; |
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1768 int kind = method_handle_ref_kind_at_error_ok(idx); |
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1769 idx1 = method_handle_index_at_error_ok(idx); |
1602 | 1770 *(bytes+1) = (unsigned char) kind; |
1771 Bytes::put_Java_u2((address) (bytes+2), idx1); | |
1772 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); | |
1773 break; | |
1774 } | |
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1775 case JVM_CONSTANT_MethodType: |
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1776 case JVM_CONSTANT_MethodTypeInError: { |
1602 | 1777 *bytes = JVM_CONSTANT_MethodType; |
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1778 idx1 = method_type_index_at_error_ok(idx); |
1602 | 1779 Bytes::put_Java_u2((address) (bytes+1), idx1); |
1780 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); | |
1781 break; | |
1782 } | |
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1783 case JVM_CONSTANT_InvokeDynamic: { |
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1784 *bytes = tag; |
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1785 idx1 = extract_low_short_from_int(*int_at_addr(idx)); |
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1786 idx2 = extract_high_short_from_int(*int_at_addr(idx)); |
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1787 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); |
1660
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1788 Bytes::put_Java_u2((address) (bytes+1), idx1); |
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1789 Bytes::put_Java_u2((address) (bytes+3), idx2); |
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1790 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); |
1660
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1791 break; |
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|
1792 } |
0 | 1793 } |
1794 DBG(printf("\n")); | |
1795 bytes += ent_size; | |
1796 size += ent_size; | |
1797 } | |
1798 assert(size == cpool_size, "Size mismatch"); | |
1799 | |
1800 // Keep temorarily for debugging until it's stable. | |
1801 DBG(print_cpool_bytes(cnt, start_bytes)); | |
1802 return (int)(bytes - start_bytes); | |
1803 } /* end copy_cpool_bytes */ | |
1804 | |
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1805 #undef DBG |
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1806 |
0 | 1807 |
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1808 void ConstantPool::set_on_stack(const bool value) { |
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1809 if (value) { |
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1810 _flags |= _on_stack; |
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1811 } else { |
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1812 _flags &= ~_on_stack; |
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1813 } |
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1814 if (value) MetadataOnStackMark::record(this); |
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1815 } |
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1816 |
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1817 // JSR 292 support for patching constant pool oops after the class is linked and |
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1818 // the oop array for resolved references are created. |
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1819 // We can't do this during classfile parsing, which is how the other indexes are |
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1820 // patched. The other patches are applied early for some error checking |
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1821 // so only defer the pseudo_strings. |
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1822 void ConstantPool::patch_resolved_references( |
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1823 GrowableArray<Handle>* cp_patches) { |
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1824 assert(EnableInvokeDynamic, ""); |
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1825 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused |
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1826 Handle patch = cp_patches->at(index); |
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1827 if (patch.not_null()) { |
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1828 assert (tag_at(index).is_string(), "should only be string left"); |
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1829 // Patching a string means pre-resolving it. |
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1830 // The spelling in the constant pool is ignored. |
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1831 // The constant reference may be any object whatever. |
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1832 // If it is not a real interned string, the constant is referred |
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1833 // to as a "pseudo-string", and must be presented to the CP |
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1834 // explicitly, because it may require scavenging. |
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1835 int obj_index = cp_to_object_index(index); |
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1836 pseudo_string_at_put(index, obj_index, patch()); |
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1837 DEBUG_ONLY(cp_patches->at_put(index, Handle());) |
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1838 } |
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1839 } |
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1840 #ifdef ASSERT |
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1841 // Ensure that all the patches have been used. |
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1842 for (int index = 0; index < cp_patches->length(); index++) { |
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1843 assert(cp_patches->at(index).is_null(), |
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1844 err_msg("Unused constant pool patch at %d in class file %s", |
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1845 index, |
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8000725: NPG: method_holder() and pool_holder() and pool_holder field should be InstanceKlass
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1846 pool_holder()->external_name())); |
6725
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1847 } |
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1848 #endif // ASSERT |
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1849 } |
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1850 |
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1851 #ifndef PRODUCT |
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1852 |
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1853 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool |
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1854 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { |
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1855 guarantee(obj->is_constantPool(), "object must be constant pool"); |
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1856 constantPoolHandle cp(THREAD, (ConstantPool*)obj); |
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1857 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); |
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1858 |
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1859 for (int i = 0; i< cp->length(); i++) { |
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1860 if (cp->tag_at(i).is_unresolved_klass()) { |
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1861 // This will force loading of the class |
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1862 Klass* klass = cp->klass_at(i, CHECK); |
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1863 if (klass->oop_is_instance()) { |
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1864 // Force initialization of class |
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1865 InstanceKlass::cast(klass)->initialize(CHECK); |
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1866 } |
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1867 } |
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1868 } |
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1869 } |
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1870 |
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1871 #endif |
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1872 |
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1873 |
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1874 // Printing |
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1875 |
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1876 void ConstantPool::print_on(outputStream* st) const { |
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1877 EXCEPTION_MARK; |
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1878 assert(is_constantPool(), "must be constantPool"); |
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1879 st->print_cr(internal_name()); |
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1880 if (flags() != 0) { |
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1881 st->print(" - flags: 0x%x", flags()); |
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1882 if (has_preresolution()) st->print(" has_preresolution"); |
7949
5daaddd917a1
8006040: NPG: on_stack processing wastes space in ConstantPool
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1883 if (on_stack()) st->print(" on_stack"); |
6725
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1884 st->cr(); |
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1885 } |
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1886 if (pool_holder() != NULL) { |
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1887 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder()); |
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1888 } |
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1889 st->print_cr(" - cache: " INTPTR_FORMAT, cache()); |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
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1890 st->print_cr(" - resolved_references: " INTPTR_FORMAT, (void *)resolved_references()); |
6725
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1891 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map()); |
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1892 |
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1893 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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1894 ((ConstantPool*)this)->print_entry_on(index, st); |
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1895 switch (tag_at(index).value()) { |
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1896 case JVM_CONSTANT_Long : |
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1897 case JVM_CONSTANT_Double : |
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1898 index++; // Skip entry following eigth-byte constant |
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1899 } |
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1900 |
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1901 } |
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1902 st->cr(); |
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1903 } |
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1904 |
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1905 // Print one constant pool entry |
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1906 void ConstantPool::print_entry_on(const int index, outputStream* st) { |
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1907 EXCEPTION_MARK; |
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1908 st->print(" - %3d : ", index); |
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1909 tag_at(index).print_on(st); |
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1910 st->print(" : "); |
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1911 switch (tag_at(index).value()) { |
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1912 case JVM_CONSTANT_Class : |
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1913 { Klass* k = klass_at(index, CATCH); |
8782
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8009593: [parfait] Null pointer deference in hotspot/src/share/vm/oops/constantPool.cpp
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1914 guarantee(k != NULL, "need klass"); |
6725
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1915 k->print_value_on(st); |
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1916 st->print(" {0x%lx}", (address)k); |
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1917 } |
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1918 break; |
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1919 case JVM_CONSTANT_Fieldref : |
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1920 case JVM_CONSTANT_Methodref : |
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1921 case JVM_CONSTANT_InterfaceMethodref : |
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1922 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); |
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1923 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); |
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1924 break; |
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1925 case JVM_CONSTANT_String : |
8104 | 1926 if (is_pseudo_string_at(index)) { |
1927 oop anObj = pseudo_string_at(index); | |
1928 anObj->print_value_on(st); | |
1929 st->print(" {0x%lx}", (address)anObj); | |
1930 } else { | |
1931 unresolved_string_at(index)->print_value_on(st); | |
1932 } | |
6725
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1933 break; |
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1934 case JVM_CONSTANT_Integer : |
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1935 st->print("%d", int_at(index)); |
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1936 break; |
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1937 case JVM_CONSTANT_Float : |
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1938 st->print("%f", float_at(index)); |
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1939 break; |
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1940 case JVM_CONSTANT_Long : |
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1941 st->print_jlong(long_at(index)); |
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1942 break; |
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1943 case JVM_CONSTANT_Double : |
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1944 st->print("%lf", double_at(index)); |
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1945 break; |
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1946 case JVM_CONSTANT_NameAndType : |
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1947 st->print("name_index=%d", name_ref_index_at(index)); |
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1948 st->print(" signature_index=%d", signature_ref_index_at(index)); |
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1949 break; |
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1950 case JVM_CONSTANT_Utf8 : |
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1951 symbol_at(index)->print_value_on(st); |
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1952 break; |
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1953 case JVM_CONSTANT_UnresolvedClass : // fall-through |
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1954 case JVM_CONSTANT_UnresolvedClassInError: { |
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1955 // unresolved_klass_at requires lock or safe world. |
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1956 CPSlot entry = slot_at(index); |
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1957 if (entry.is_resolved()) { |
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1958 entry.get_klass()->print_value_on(st); |
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1959 } else { |
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1960 entry.get_symbol()->print_value_on(st); |
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1961 } |
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1962 } |
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1963 break; |
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1964 case JVM_CONSTANT_MethodHandle : |
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1965 case JVM_CONSTANT_MethodHandleInError : |
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1966 st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index)); |
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1967 st->print(" ref_index=%d", method_handle_index_at_error_ok(index)); |
6725
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1968 break; |
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1969 case JVM_CONSTANT_MethodType : |
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1970 case JVM_CONSTANT_MethodTypeInError : |
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1971 st->print("signature_index=%d", method_type_index_at_error_ok(index)); |
6725
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1972 break; |
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1973 case JVM_CONSTANT_InvokeDynamic : |
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1974 { |
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1975 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); |
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1976 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); |
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1977 int argc = invoke_dynamic_argument_count_at(index); |
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1978 if (argc > 0) { |
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1979 for (int arg_i = 0; arg_i < argc; arg_i++) { |
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1980 int arg = invoke_dynamic_argument_index_at(index, arg_i); |
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1981 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); |
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1982 } |
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1983 st->print("}"); |
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1984 } |
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1985 } |
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1986 break; |
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1987 default: |
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1988 ShouldNotReachHere(); |
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1989 break; |
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1990 } |
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1991 st->cr(); |
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1992 } |
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1993 |
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1994 void ConstantPool::print_value_on(outputStream* st) const { |
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1995 assert(is_constantPool(), "must be constantPool"); |
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1996 st->print("constant pool [%d]", length()); |
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1997 if (has_preresolution()) st->print("/preresolution"); |
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1998 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); |
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1999 print_address_on(st); |
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2000 st->print(" for "); |
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2001 pool_holder()->print_value_on(st); |
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2002 if (pool_holder() != NULL) { |
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2003 bool extra = (pool_holder()->constants() != this); |
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2004 if (extra) st->print(" (extra)"); |
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2005 } |
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2006 if (cache() != NULL) { |
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2007 st->print(" cache=" PTR_FORMAT, cache()); |
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2008 } |
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2009 } |
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2010 |
7956 | 2011 #if INCLUDE_SERVICES |
2012 // Size Statistics | |
2013 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { | |
2014 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); | |
2015 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); | |
2016 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); | |
2017 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); | |
2018 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); | |
2019 | |
2020 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + | |
2021 sz->_cp_refmap_bytes; | |
2022 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; | |
2023 } | |
2024 #endif // INCLUDE_SERVICES | |
6725
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2025 |
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2026 // Verification |
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2027 |
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2028 void ConstantPool::verify_on(outputStream* st) { |
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2029 guarantee(is_constantPool(), "object must be constant pool"); |
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2030 for (int i = 0; i< length(); i++) { |
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2031 constantTag tag = tag_at(i); |
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2032 CPSlot entry = slot_at(i); |
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2033 if (tag.is_klass()) { |
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2034 if (entry.is_resolved()) { |
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2035 guarantee(entry.get_klass()->is_klass(), "should be klass"); |
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2036 } |
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2037 } else if (tag.is_unresolved_klass()) { |
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2038 if (entry.is_resolved()) { |
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2039 guarantee(entry.get_klass()->is_klass(), "should be klass"); |
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2040 } |
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2041 } else if (tag.is_symbol()) { |
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2042 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
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2043 } else if (tag.is_string()) { |
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2044 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
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2045 } |
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2046 } |
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2047 if (cache() != NULL) { |
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2048 // Note: cache() can be NULL before a class is completely setup or |
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2049 // in temporary constant pools used during constant pool merging |
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2050 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); |
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2051 } |
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2052 if (pool_holder() != NULL) { |
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2053 // Note: pool_holder() can be NULL in temporary constant pools |
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2054 // used during constant pool merging |
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2055 guarantee(pool_holder()->is_klass(), "should be klass"); |
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2056 } |
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2057 } |
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2058 |
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2059 |
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2060 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { |
0 | 2061 char *str = sym->as_utf8(); |
2062 unsigned int hash = compute_hash(str, sym->utf8_length()); | |
2063 unsigned int index = hash % table_size(); | |
2064 | |
2065 // check if already in map | |
2066 // we prefer the first entry since it is more likely to be what was used in | |
2067 // the class file | |
2068 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2069 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2070 if (en->hash() == hash && en->symbol() == sym) { | |
2071 return; // already there | |
2072 } | |
2073 } | |
2074 | |
2075 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); | |
2076 entry->set_next(bucket(index)); | |
2077 _buckets[index].set_entry(entry); | |
2078 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2079 } | |
2080 | |
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2081 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { |
0 | 2082 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); |
2083 char *str = sym->as_utf8(); | |
2084 int len = sym->utf8_length(); | |
2085 unsigned int hash = SymbolHashMap::compute_hash(str, len); | |
2086 unsigned int index = hash % table_size(); | |
2087 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2088 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2089 if (en->hash() == hash && en->symbol() == sym) { | |
2090 return en; | |
2091 } | |
2092 } | |
2093 return NULL; | |
2094 } |