Mercurial > hg > truffle
annotate src/share/vm/oops/constantPool.cpp @ 8116:6931f425c517
8007294: ReduceFieldZeroing doesn't check for dependent load and can lead to incorrect execution
Summary: InitializeNode::can_capture_store() must check that the captured store doesn't overwrite a memory location that is loaded before the store.
Reviewed-by: kvn
author | roland |
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date | Mon, 25 Feb 2013 14:13:04 +0100 |
parents | dc31f560d6e7 |
children | f16e75e0cf11 |
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, 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. The constant pool cache index |
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120 // has the mapping back to both the constant pool and to the resolved |
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121 // 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, 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 for (int i = 0; i< reference_map()->length(); i++) { |
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176 if (reference_map()->at(i) == cp_index) return i; |
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177 // Zero entry is divider between constant pool indices for strings, |
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178 // method handles and method types. After that the index is a constant |
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179 // pool cache index for invokedynamic. Stop when zero (which can never |
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180 // be a constant pool index) |
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181 if (reference_map()->at(i) == 0) break; |
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182 } |
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183 // We might not find the index. |
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184 return _no_index_sentinel; |
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185 } |
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186 |
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187 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) { |
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188 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
0 | 189 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and |
190 // tag is not updated atomicly. | |
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191 |
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192 CPSlot entry = this_oop->slot_at(which); |
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193 if (entry.is_resolved()) { |
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194 assert(entry.get_klass()->is_klass(), "must be"); |
0 | 195 // Already resolved - return entry. |
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196 return entry.get_klass(); |
0 | 197 } |
198 | |
199 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object | |
200 // already has updated the object | |
201 assert(THREAD->is_Java_thread(), "must be a Java thread"); | |
202 bool do_resolve = false; | |
203 bool in_error = false; | |
204 | |
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205 // Create a handle for the mirror. This will preserve the resolved class |
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206 // until the loader_data is registered. |
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207 Handle mirror_handle; |
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208 |
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209 Symbol* name = NULL; |
0 | 210 Handle loader; |
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211 { MonitorLockerEx ml(this_oop->lock()); |
0 | 212 |
213 if (this_oop->tag_at(which).is_unresolved_klass()) { | |
214 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
215 in_error = true; | |
216 } else { | |
217 do_resolve = true; | |
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218 name = this_oop->unresolved_klass_at(which); |
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219 loader = Handle(THREAD, this_oop->pool_holder()->class_loader()); |
0 | 220 } |
221 } | |
222 } // unlocking constantPool | |
223 | |
224 | |
225 // The original attempt to resolve this constant pool entry failed so find the | |
226 // original error and throw it again (JVMS 5.4.3). | |
227 if (in_error) { | |
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228 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which); |
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229 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); |
0 | 230 ResourceMark rm; |
231 // exception text will be the class name | |
232 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
233 THROW_MSG_0(error, className); | |
234 } | |
235 | |
236 if (do_resolve) { | |
237 // this_oop must be unlocked during resolve_or_fail | |
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238 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 239 Handle h_prot (THREAD, protection_domain); |
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240 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD); |
0 | 241 KlassHandle k; |
242 if (!HAS_PENDING_EXCEPTION) { | |
243 k = KlassHandle(THREAD, k_oop); | |
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244 // preserve the resolved klass. |
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245 mirror_handle = Handle(THREAD, k_oop->java_mirror()); |
0 | 246 // Do access check for klasses |
247 verify_constant_pool_resolve(this_oop, k, THREAD); | |
248 } | |
249 | |
250 // Failed to resolve class. We must record the errors so that subsequent attempts | |
251 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). | |
252 if (HAS_PENDING_EXCEPTION) { | |
253 ResourceMark rm; | |
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254 Symbol* error = PENDING_EXCEPTION->klass()->name(); |
0 | 255 |
256 bool throw_orig_error = false; | |
257 { | |
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258 MonitorLockerEx ml(this_oop->lock()); |
0 | 259 |
260 // some other thread has beaten us and has resolved the class. | |
261 if (this_oop->tag_at(which).is_klass()) { | |
262 CLEAR_PENDING_EXCEPTION; | |
263 entry = this_oop->resolved_klass_at(which); | |
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264 return entry.get_klass(); |
0 | 265 } |
266 | |
267 if (!PENDING_EXCEPTION-> | |
1142 | 268 is_a(SystemDictionary::LinkageError_klass())) { |
0 | 269 // Just throw the exception and don't prevent these classes from |
270 // being loaded due to virtual machine errors like StackOverflow | |
271 // and OutOfMemoryError, etc, or if the thread was hit by stop() | |
272 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) | |
273 } | |
274 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
275 SystemDictionary::add_resolution_error(this_oop, which, error); | |
276 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError); | |
277 } else { | |
278 // some other thread has put the class in error state. | |
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279 error = SystemDictionary::find_resolution_error(this_oop, which); |
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280 assert(error != NULL, "checking"); |
0 | 281 throw_orig_error = true; |
282 } | |
283 } // unlocked | |
284 | |
285 if (throw_orig_error) { | |
286 CLEAR_PENDING_EXCEPTION; | |
287 ResourceMark rm; | |
288 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
289 THROW_MSG_0(error, className); | |
290 } | |
291 | |
292 return 0; | |
293 } | |
294 | |
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295 if (TraceClassResolution && !k()->oop_is_array()) { |
0 | 296 // skip resolving the constant pool so that this code get's |
297 // called the next time some bytecodes refer to this class. | |
298 ResourceMark rm; | |
299 int line_number = -1; | |
300 const char * source_file = NULL; | |
301 if (JavaThread::current()->has_last_Java_frame()) { | |
302 // try to identify the method which called this function. | |
303 vframeStream vfst(JavaThread::current()); | |
304 if (!vfst.at_end()) { | |
305 line_number = vfst.method()->line_number_from_bci(vfst.bci()); | |
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306 Symbol* s = vfst.method()->method_holder()->source_file_name(); |
0 | 307 if (s != NULL) { |
308 source_file = s->as_C_string(); | |
309 } | |
310 } | |
311 } | |
312 if (k() != this_oop->pool_holder()) { | |
313 // only print something if the classes are different | |
314 if (source_file != NULL) { | |
315 tty->print("RESOLVE %s %s %s:%d\n", | |
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316 this_oop->pool_holder()->external_name(), |
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317 InstanceKlass::cast(k())->external_name(), source_file, line_number); |
0 | 318 } else { |
319 tty->print("RESOLVE %s %s\n", | |
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320 this_oop->pool_holder()->external_name(), |
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321 InstanceKlass::cast(k())->external_name()); |
0 | 322 } |
323 } | |
324 return k(); | |
325 } else { | |
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326 MonitorLockerEx ml(this_oop->lock()); |
0 | 327 // Only updated constant pool - if it is resolved. |
328 do_resolve = this_oop->tag_at(which).is_unresolved_klass(); | |
329 if (do_resolve) { | |
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330 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data(); |
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331 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM |
0 | 332 this_oop->klass_at_put(which, k()); |
333 } | |
334 } | |
335 } | |
336 | |
337 entry = this_oop->resolved_klass_at(which); | |
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338 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); |
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339 return entry.get_klass(); |
0 | 340 } |
341 | |
342 | |
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343 // Does not update ConstantPool* - to avoid any exception throwing. Used |
0 | 344 // by compiler and exception handling. Also used to avoid classloads for |
345 // instanceof operations. Returns NULL if the class has not been loaded or | |
346 // if the verification of constant pool failed | |
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347 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) { |
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348 CPSlot entry = this_oop->slot_at(which); |
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349 if (entry.is_resolved()) { |
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350 assert(entry.get_klass()->is_klass(), "must be"); |
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351 return entry.get_klass(); |
0 | 352 } else { |
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353 assert(entry.is_unresolved(), "must be either symbol or klass"); |
0 | 354 Thread *thread = Thread::current(); |
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355 Symbol* name = entry.get_symbol(); |
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356 oop loader = this_oop->pool_holder()->class_loader(); |
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357 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 358 Handle h_prot (thread, protection_domain); |
359 Handle h_loader (thread, loader); | |
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360 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); |
0 | 361 |
362 if (k != NULL) { | |
363 // Make sure that resolving is legal | |
364 EXCEPTION_MARK; | |
365 KlassHandle klass(THREAD, k); | |
366 // return NULL if verification fails | |
367 verify_constant_pool_resolve(this_oop, klass, THREAD); | |
368 if (HAS_PENDING_EXCEPTION) { | |
369 CLEAR_PENDING_EXCEPTION; | |
370 return NULL; | |
371 } | |
372 return klass(); | |
373 } else { | |
374 return k; | |
375 } | |
376 } | |
377 } | |
378 | |
379 | |
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380 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) { |
0 | 381 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which)); |
382 } | |
383 | |
384 | |
385 // This is an interface for the compiler that allows accessing non-resolved entries | |
386 // in the constant pool - but still performs the validations tests. Must be used | |
387 // in a pre-parse of the compiler - to determine what it can do and not do. | |
388 // Note: We cannot update the ConstantPool from the vm_thread. | |
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389 Klass* ConstantPool::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) { |
0 | 390 int which = this_oop->klass_ref_index_at(index); |
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391 CPSlot entry = this_oop->slot_at(which); |
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392 if (entry.is_resolved()) { |
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393 assert(entry.get_klass()->is_klass(), "must be"); |
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394 return entry.get_klass(); |
0 | 395 } else { |
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396 assert(entry.is_unresolved(), "must be either symbol or klass"); |
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397 Symbol* name = entry.get_symbol(); |
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398 oop loader = this_oop->pool_holder()->class_loader(); |
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399 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 400 Handle h_loader(THREAD, loader); |
401 Handle h_prot (THREAD, protection_domain); | |
402 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD)); | |
403 | |
404 // Do access check for klasses | |
405 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL); | |
406 return k(); | |
407 } | |
408 } | |
409 | |
410 | |
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411 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool, |
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412 int which) { |
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413 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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414 int cache_index = decode_cpcache_index(which, true); |
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415 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { |
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416 // FIXME: should be an assert |
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417 if (PrintMiscellaneous && (Verbose||WizardMode)) { |
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418 tty->print_cr("bad operand %d in:", which); cpool->print(); |
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419 } |
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420 return NULL; |
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421 } |
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422 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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423 return e->method_if_resolved(cpool); |
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424 } |
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425 |
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426 |
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427 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) { |
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428 if (cpool->cache() == NULL) return false; // nothing to load yet |
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429 int cache_index = decode_cpcache_index(which, true); |
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430 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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431 return e->has_appendix(); |
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432 } |
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433 |
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434 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) { |
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435 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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436 int cache_index = decode_cpcache_index(which, true); |
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437 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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438 return e->appendix_if_resolved(cpool); |
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439 } |
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440 |
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441 |
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442 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) { |
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443 if (cpool->cache() == NULL) return false; // nothing to load yet |
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444 int cache_index = decode_cpcache_index(which, true); |
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445 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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446 return e->has_method_type(); |
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447 } |
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448 |
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449 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) { |
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450 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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451 int cache_index = decode_cpcache_index(which, true); |
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452 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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453 return e->method_type_if_resolved(cpool); |
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454 } |
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455 |
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456 |
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457 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { |
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458 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
0 | 459 return symbol_at(name_index); |
460 } | |
461 | |
462 | |
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463 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { |
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464 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
0 | 465 return symbol_at(signature_index); |
466 } | |
467 | |
468 | |
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469 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { |
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470 int i = which; |
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471 if (!uncached && cache() != NULL) { |
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472 if (ConstantPool::is_invokedynamic_index(which)) { |
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473 // Invokedynamic index is index into resolved_references |
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474 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); |
2460 | 475 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); |
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476 assert(tag_at(pool_index).is_name_and_type(), ""); |
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477 return pool_index; |
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478 } |
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479 // change byte-ordering and go via cache |
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480 i = remap_instruction_operand_from_cache(which); |
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481 } else { |
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482 if (tag_at(which).is_invoke_dynamic()) { |
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483 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); |
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484 assert(tag_at(pool_index).is_name_and_type(), ""); |
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485 return pool_index; |
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486 } |
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487 } |
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488 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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489 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); |
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490 jint ref_index = *int_at_addr(i); |
0 | 491 return extract_high_short_from_int(ref_index); |
492 } | |
493 | |
494 | |
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495 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { |
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496 guarantee(!ConstantPool::is_invokedynamic_index(which), |
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497 "an invokedynamic instruction does not have a klass"); |
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498 int i = which; |
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499 if (!uncached && cache() != NULL) { |
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500 // change byte-ordering and go via cache |
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501 i = remap_instruction_operand_from_cache(which); |
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502 } |
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503 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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504 jint ref_index = *int_at_addr(i); |
0 | 505 return extract_low_short_from_int(ref_index); |
506 } | |
507 | |
508 | |
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509 |
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510 int ConstantPool::remap_instruction_operand_from_cache(int operand) { |
1565 | 511 int cpc_index = operand; |
512 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); | |
513 assert((int)(u2)cpc_index == cpc_index, "clean u2"); | |
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514 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); |
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515 return member_index; |
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516 } |
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517 |
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518 |
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519 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) { |
0 | 520 if (k->oop_is_instance() || k->oop_is_objArray()) { |
521 instanceKlassHandle holder (THREAD, this_oop->pool_holder()); | |
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522 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); |
0 | 523 KlassHandle element (THREAD, elem_oop); |
524 | |
525 // The element type could be a typeArray - we only need the access check if it is | |
526 // an reference to another class | |
527 if (element->oop_is_instance()) { | |
528 LinkResolver::check_klass_accessability(holder, element, CHECK); | |
529 } | |
530 } | |
531 } | |
532 | |
533 | |
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534 int ConstantPool::name_ref_index_at(int which_nt) { |
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535 jint ref_index = name_and_type_at(which_nt); |
0 | 536 return extract_low_short_from_int(ref_index); |
537 } | |
538 | |
539 | |
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540 int ConstantPool::signature_ref_index_at(int which_nt) { |
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541 jint ref_index = name_and_type_at(which_nt); |
0 | 542 return extract_high_short_from_int(ref_index); |
543 } | |
544 | |
545 | |
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546 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { |
0 | 547 return klass_at(klass_ref_index_at(which), CHECK_NULL); |
548 } | |
549 | |
550 | |
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551 Symbol* ConstantPool::klass_name_at(int which) { |
0 | 552 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), |
553 "Corrupted constant pool"); | |
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554 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
0 | 555 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and |
556 // tag is not updated atomicly. | |
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557 CPSlot entry = slot_at(which); |
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558 if (entry.is_resolved()) { |
0 | 559 // Already resolved - return entry's name. |
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560 assert(entry.get_klass()->is_klass(), "must be"); |
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561 return entry.get_klass()->name(); |
0 | 562 } else { |
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563 assert(entry.is_unresolved(), "must be either symbol or klass"); |
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564 return entry.get_symbol(); |
0 | 565 } |
566 } | |
567 | |
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568 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { |
0 | 569 jint ref_index = klass_ref_index_at(which); |
570 return klass_at_noresolve(ref_index); | |
571 } | |
572 | |
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573 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { |
1602 | 574 jint ref_index = uncached_klass_ref_index_at(which); |
575 return klass_at_noresolve(ref_index); | |
576 } | |
577 | |
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578 char* ConstantPool::string_at_noresolve(int which) { |
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579 Symbol* s = unresolved_string_at(which); |
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580 if (s == NULL) { |
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581 return (char*)"<pseudo-string>"; |
0 | 582 } else { |
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583 return unresolved_string_at(which)->as_C_string(); |
0 | 584 } |
585 } | |
586 | |
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587 BasicType ConstantPool::basic_type_for_signature_at(int which) { |
0 | 588 return FieldType::basic_type(symbol_at(which)); |
589 } | |
590 | |
591 | |
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592 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) { |
0 | 593 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused |
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594 if (this_oop->tag_at(index).is_string()) { |
0 | 595 this_oop->string_at(index, CHECK); |
596 } | |
597 } | |
598 } | |
599 | |
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600 // Resolve all the classes in the constant pool. If they are all resolved, |
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601 // the constant pool is read-only. Enhancement: allocate cp entries to |
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602 // another metaspace, and copy to read-only or read-write space if this |
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603 // bit is set. |
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604 bool ConstantPool::resolve_class_constants(TRAPS) { |
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605 constantPoolHandle cp(THREAD, this); |
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606 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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607 if (tag_at(index).is_unresolved_klass() && |
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608 klass_at_if_loaded(cp, index) == NULL) { |
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609 return false; |
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610 } |
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611 } |
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612 // set_preresolution(); or some bit for future use |
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613 return true; |
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614 } |
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615 |
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616 // If resolution for MethodHandle or MethodType fails, save the exception |
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617 // in the resolution error table, so that the same exception is thrown again. |
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618 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which, |
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619 int tag, TRAPS) { |
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620 ResourceMark rm; |
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621 Symbol* error = PENDING_EXCEPTION->klass()->name(); |
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622 MonitorLockerEx ml(this_oop->lock()); // lock cpool to change tag. |
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623 |
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624 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ? |
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625 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError; |
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626 |
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627 if (!PENDING_EXCEPTION-> |
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628 is_a(SystemDictionary::LinkageError_klass())) { |
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629 // Just throw the exception and don't prevent these classes from |
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630 // being loaded due to virtual machine errors like StackOverflow |
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631 // and OutOfMemoryError, etc, or if the thread was hit by stop() |
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632 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) |
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633 |
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634 } else if (this_oop->tag_at(which).value() != error_tag) { |
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635 SystemDictionary::add_resolution_error(this_oop, which, error); |
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636 this_oop->tag_at_put(which, error_tag); |
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637 } else { |
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638 // some other thread has put the class in error state. |
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639 error = SystemDictionary::find_resolution_error(this_oop, which); |
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640 assert(error != NULL, "checking"); |
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641 CLEAR_PENDING_EXCEPTION; |
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642 THROW_MSG(error, ""); |
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643 } |
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644 } |
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645 |
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646 |
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647 // Called to resolve constants in the constant pool and return an oop. |
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648 // Some constant pool entries cache their resolved oop. This is also |
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649 // called to create oops from constants to use in arguments for invokedynamic |
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650 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) { |
1602 | 651 oop result_oop = NULL; |
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652 Handle throw_exception; |
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653 |
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654 if (cache_index == _possible_index_sentinel) { |
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655 // It is possible that this constant is one which is cached in the objects. |
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656 // We'll do a linear search. This should be OK because this usage is rare. |
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657 assert(index > 0, "valid index"); |
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658 cache_index = this_oop->cp_to_object_index(index); |
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659 } |
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660 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); |
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661 assert(index == _no_index_sentinel || index >= 0, ""); |
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662 |
1602 | 663 if (cache_index >= 0) { |
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664 result_oop = this_oop->resolved_references()->obj_at(cache_index); |
1602 | 665 if (result_oop != NULL) { |
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666 return result_oop; |
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667 // That was easy... |
1602 | 668 } |
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669 index = this_oop->object_to_cp_index(cache_index); |
1602 | 670 } |
671 | |
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672 jvalue prim_value; // temp used only in a few cases below |
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673 |
1602 | 674 int tag_value = this_oop->tag_at(index).value(); |
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675 |
1602 | 676 switch (tag_value) { |
677 | |
678 case JVM_CONSTANT_UnresolvedClass: | |
679 case JVM_CONSTANT_UnresolvedClassInError: | |
680 case JVM_CONSTANT_Class: | |
681 { | |
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682 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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683 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL); |
1602 | 684 // ldc wants the java mirror. |
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685 result_oop = resolved->java_mirror(); |
1602 | 686 break; |
687 } | |
688 | |
689 case JVM_CONSTANT_String: | |
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690 assert(cache_index != _no_index_sentinel, "should have been set"); |
1602 | 691 if (this_oop->is_pseudo_string_at(index)) { |
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692 result_oop = this_oop->pseudo_string_at(index, cache_index); |
1602 | 693 break; |
694 } | |
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695 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL); |
1602 | 696 break; |
697 | |
698 case JVM_CONSTANT_Object: | |
699 result_oop = this_oop->object_at(index); | |
700 break; | |
701 | |
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702 case JVM_CONSTANT_MethodHandleInError: |
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703 case JVM_CONSTANT_MethodTypeInError: |
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704 { |
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705 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index); |
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706 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); |
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707 ResourceMark rm; |
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708 THROW_MSG_0(error, ""); |
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709 break; |
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710 } |
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711 |
1602 | 712 case JVM_CONSTANT_MethodHandle: |
713 { | |
714 int ref_kind = this_oop->method_handle_ref_kind_at(index); | |
715 int callee_index = this_oop->method_handle_klass_index_at(index); | |
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716 Symbol* name = this_oop->method_handle_name_ref_at(index); |
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717 Symbol* signature = this_oop->method_handle_signature_ref_at(index); |
1602 | 718 if (PrintMiscellaneous) |
719 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", | |
720 ref_kind, index, this_oop->method_handle_index_at(index), | |
721 callee_index, name->as_C_string(), signature->as_C_string()); | |
722 KlassHandle callee; | |
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723 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL); |
1602 | 724 callee = KlassHandle(THREAD, k); |
725 } | |
726 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
727 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, | |
728 callee, name, signature, | |
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729 THREAD); |
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730 result_oop = value(); |
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731 if (HAS_PENDING_EXCEPTION) { |
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732 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); |
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733 } |
1602 | 734 break; |
735 } | |
736 | |
737 case JVM_CONSTANT_MethodType: | |
738 { | |
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739 Symbol* signature = this_oop->method_type_signature_at(index); |
1602 | 740 if (PrintMiscellaneous) |
741 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", | |
742 index, this_oop->method_type_index_at(index), | |
743 signature->as_C_string()); | |
744 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
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745 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); |
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746 result_oop = value(); |
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747 if (HAS_PENDING_EXCEPTION) { |
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748 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); |
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749 } |
1602 | 750 break; |
751 } | |
752 | |
753 case JVM_CONSTANT_Integer: | |
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754 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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755 prim_value.i = this_oop->int_at(index); |
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756 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); |
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757 break; |
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758 |
1602 | 759 case JVM_CONSTANT_Float: |
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760 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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761 prim_value.f = this_oop->float_at(index); |
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762 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); |
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763 break; |
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764 |
1602 | 765 case JVM_CONSTANT_Long: |
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766 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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767 prim_value.j = this_oop->long_at(index); |
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768 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); |
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769 break; |
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770 |
1602 | 771 case JVM_CONSTANT_Double: |
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772 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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773 prim_value.d = this_oop->double_at(index); |
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774 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); |
1602 | 775 break; |
776 | |
777 default: | |
778 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", | |
779 this_oop(), index, cache_index, tag_value) ); | |
780 assert(false, "unexpected constant tag"); | |
781 break; | |
782 } | |
783 | |
784 if (cache_index >= 0) { | |
785 // Cache the oop here also. | |
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786 Handle result_handle(THREAD, result_oop); |
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787 MonitorLockerEx ml(this_oop->lock()); // don't know if we really need this |
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788 oop result = this_oop->resolved_references()->obj_at(cache_index); |
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789 // Benign race condition: resolved_references may already be filled in while we were trying to lock. |
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790 // The important thing here is that all threads pick up the same result. |
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791 // It doesn't matter which racing thread wins, as long as only one |
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792 // result is used by all threads, and all future queries. |
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793 // That result may be either a resolved constant or a failure exception. |
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794 if (result == NULL) { |
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795 this_oop->resolved_references()->obj_at_put(cache_index, result_handle()); |
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796 return result_handle(); |
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797 } else { |
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798 // Return the winning thread's result. This can be different than |
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799 // result_handle() for MethodHandles. |
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800 return result; |
1602 | 801 } |
802 } else { | |
803 return result_oop; | |
804 } | |
805 } | |
806 | |
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807 oop ConstantPool::uncached_string_at(int which, TRAPS) { |
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808 Symbol* sym = unresolved_string_at(which); |
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809 oop str = StringTable::intern(sym, CHECK_(NULL)); |
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810 assert(java_lang_String::is_instance(str), "must be string"); |
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811 return str; |
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812 } |
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813 |
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814 |
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815 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) { |
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816 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); |
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817 |
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818 Handle bsm; |
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819 int argc; |
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820 { |
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821 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments |
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822 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. |
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823 // It is accompanied by the optional arguments. |
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824 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index); |
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825 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); |
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826 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { |
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827 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); |
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828 } |
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829 |
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830 // Extract the optional static arguments. |
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831 argc = this_oop->invoke_dynamic_argument_count_at(index); |
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832 if (argc == 0) return bsm_oop; |
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833 |
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834 bsm = Handle(THREAD, bsm_oop); |
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835 } |
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836 |
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837 objArrayHandle info; |
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838 { |
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839 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); |
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840 info = objArrayHandle(THREAD, info_oop); |
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841 } |
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842 |
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843 info->obj_at_put(0, bsm()); |
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844 for (int i = 0; i < argc; i++) { |
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845 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i); |
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846 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); |
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847 info->obj_at_put(1+i, arg_oop); |
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848 } |
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849 |
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850 return info(); |
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851 } |
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852 |
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853 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) { |
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854 // If the string has already been interned, this entry will be non-null |
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855 oop str = this_oop->resolved_references()->obj_at(obj_index); |
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856 if (str != NULL) return str; |
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857 |
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858 Symbol* sym = this_oop->unresolved_string_at(which); |
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859 str = StringTable::intern(sym, CHECK_(NULL)); |
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860 this_oop->string_at_put(which, obj_index, str); |
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861 assert(java_lang_String::is_instance(str), "must be string"); |
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862 return str; |
0 | 863 } |
864 | |
865 | |
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866 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, |
0 | 867 int which) { |
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868 // Names are interned, so we can compare Symbol*s directly |
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869 Symbol* cp_name = klass_name_at(which); |
0 | 870 return (cp_name == k->name()); |
871 } | |
872 | |
873 | |
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874 // Iterate over symbols and decrement ones which are Symbol*s. |
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875 // This is done during GC so do not need to lock constantPool unless we |
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876 // have per-thread safepoints. |
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877 // Only decrement the UTF8 symbols. Unresolved classes and strings point to |
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878 // these symbols but didn't increment the reference count. |
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879 void ConstantPool::unreference_symbols() { |
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880 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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881 constantTag tag = tag_at(index); |
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882 if (tag.is_symbol()) { |
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883 symbol_at(index)->decrement_refcount(); |
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884 } |
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885 } |
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886 } |
0 | 887 |
888 | |
889 // Compare this constant pool's entry at index1 to the constant pool | |
890 // cp2's entry at index2. | |
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891 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2, |
0 | 892 int index2, TRAPS) { |
893 | |
894 jbyte t1 = tag_at(index1).value(); | |
895 jbyte t2 = cp2->tag_at(index2).value(); | |
896 | |
897 | |
898 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass | |
899 // when comparing | |
900 if (t1 == JVM_CONSTANT_UnresolvedClassInError) { | |
901 t1 = JVM_CONSTANT_UnresolvedClass; | |
902 } | |
903 if (t2 == JVM_CONSTANT_UnresolvedClassInError) { | |
904 t2 = JVM_CONSTANT_UnresolvedClass; | |
905 } | |
906 | |
907 if (t1 != t2) { | |
908 // Not the same entry type so there is nothing else to check. Note | |
909 // that this style of checking will consider resolved/unresolved | |
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910 // class pairs as different. |
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911 // From the ConstantPool* API point of view, this is correct |
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912 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this |
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913 // plays out in the context of ConstantPool* merging. |
0 | 914 return false; |
915 } | |
916 | |
917 switch (t1) { | |
918 case JVM_CONSTANT_Class: | |
919 { | |
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920 Klass* k1 = klass_at(index1, CHECK_false); |
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921 Klass* k2 = cp2->klass_at(index2, CHECK_false); |
0 | 922 if (k1 == k2) { |
923 return true; | |
924 } | |
925 } break; | |
926 | |
927 case JVM_CONSTANT_ClassIndex: | |
928 { | |
929 int recur1 = klass_index_at(index1); | |
930 int recur2 = cp2->klass_index_at(index2); | |
931 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
932 if (match) { | |
933 return true; | |
934 } | |
935 } break; | |
936 | |
937 case JVM_CONSTANT_Double: | |
938 { | |
939 jdouble d1 = double_at(index1); | |
940 jdouble d2 = cp2->double_at(index2); | |
941 if (d1 == d2) { | |
942 return true; | |
943 } | |
944 } break; | |
945 | |
946 case JVM_CONSTANT_Fieldref: | |
947 case JVM_CONSTANT_InterfaceMethodref: | |
948 case JVM_CONSTANT_Methodref: | |
949 { | |
950 int recur1 = uncached_klass_ref_index_at(index1); | |
951 int recur2 = cp2->uncached_klass_ref_index_at(index2); | |
952 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
953 if (match) { | |
954 recur1 = uncached_name_and_type_ref_index_at(index1); | |
955 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); | |
956 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
957 if (match) { | |
958 return true; | |
959 } | |
960 } | |
961 } break; | |
962 | |
963 case JVM_CONSTANT_Float: | |
964 { | |
965 jfloat f1 = float_at(index1); | |
966 jfloat f2 = cp2->float_at(index2); | |
967 if (f1 == f2) { | |
968 return true; | |
969 } | |
970 } break; | |
971 | |
972 case JVM_CONSTANT_Integer: | |
973 { | |
974 jint i1 = int_at(index1); | |
975 jint i2 = cp2->int_at(index2); | |
976 if (i1 == i2) { | |
977 return true; | |
978 } | |
979 } break; | |
980 | |
981 case JVM_CONSTANT_Long: | |
982 { | |
983 jlong l1 = long_at(index1); | |
984 jlong l2 = cp2->long_at(index2); | |
985 if (l1 == l2) { | |
986 return true; | |
987 } | |
988 } break; | |
989 | |
990 case JVM_CONSTANT_NameAndType: | |
991 { | |
992 int recur1 = name_ref_index_at(index1); | |
993 int recur2 = cp2->name_ref_index_at(index2); | |
994 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
995 if (match) { | |
996 recur1 = signature_ref_index_at(index1); | |
997 recur2 = cp2->signature_ref_index_at(index2); | |
998 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
999 if (match) { | |
1000 return true; | |
1001 } | |
1002 } | |
1003 } break; | |
1004 | |
1005 case JVM_CONSTANT_StringIndex: | |
1006 { | |
1007 int recur1 = string_index_at(index1); | |
1008 int recur2 = cp2->string_index_at(index2); | |
1009 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
1010 if (match) { | |
1011 return true; | |
1012 } | |
1013 } break; | |
1014 | |
1015 case JVM_CONSTANT_UnresolvedClass: | |
1016 { | |
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1017 Symbol* k1 = unresolved_klass_at(index1); |
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1018 Symbol* k2 = cp2->unresolved_klass_at(index2); |
0 | 1019 if (k1 == k2) { |
1020 return true; | |
1021 } | |
1022 } break; | |
1023 | |
1602 | 1024 case JVM_CONSTANT_MethodType: |
1025 { | |
1026 int k1 = method_type_index_at(index1); | |
1027 int k2 = cp2->method_type_index_at(index2); | |
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1028 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1029 if (match) { |
1602 | 1030 return true; |
1031 } | |
1032 } break; | |
1033 | |
1034 case JVM_CONSTANT_MethodHandle: | |
1035 { | |
1036 int k1 = method_handle_ref_kind_at(index1); | |
1037 int k2 = cp2->method_handle_ref_kind_at(index2); | |
1038 if (k1 == k2) { | |
1039 int i1 = method_handle_index_at(index1); | |
1040 int i2 = cp2->method_handle_index_at(index2); | |
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1041 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); |
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1042 if (match) { |
1602 | 1043 return true; |
1044 } | |
1045 } | |
1046 } break; | |
1047 | |
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1048 case JVM_CONSTANT_InvokeDynamic: |
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1049 { |
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1050 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1); |
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1051 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2); |
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1052 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1053 if (!match) return false; |
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1054 k1 = invoke_dynamic_name_and_type_ref_index_at(index1); |
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1055 k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); |
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1056 match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1057 if (!match) return false; |
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1058 int argc = invoke_dynamic_argument_count_at(index1); |
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1059 if (argc == cp2->invoke_dynamic_argument_count_at(index2)) { |
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1060 for (int j = 0; j < argc; j++) { |
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1061 k1 = invoke_dynamic_argument_index_at(index1, j); |
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1062 k2 = cp2->invoke_dynamic_argument_index_at(index2, j); |
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1063 match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1064 if (!match) return false; |
1913
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1065 } |
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1066 return true; // got through loop; all elements equal |
1660
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1067 } |
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1068 } break; |
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1069 |
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1070 case JVM_CONSTANT_String: |
0 | 1071 { |
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1072 Symbol* s1 = unresolved_string_at(index1); |
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1073 Symbol* s2 = cp2->unresolved_string_at(index2); |
0 | 1074 if (s1 == s2) { |
1075 return true; | |
1076 } | |
1077 } break; | |
1078 | |
1079 case JVM_CONSTANT_Utf8: | |
1080 { | |
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1081 Symbol* s1 = symbol_at(index1); |
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1082 Symbol* s2 = cp2->symbol_at(index2); |
0 | 1083 if (s1 == s2) { |
1084 return true; | |
1085 } | |
1086 } break; | |
1087 | |
1088 // Invalid is used as the tag for the second constant pool entry | |
1089 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1090 // not be seen by itself. | |
1091 case JVM_CONSTANT_Invalid: // fall through | |
1092 | |
1093 default: | |
1094 ShouldNotReachHere(); | |
1095 break; | |
1096 } | |
1097 | |
1098 return false; | |
1099 } // end compare_entry_to() | |
1100 | |
1101 | |
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1102 void ConstantPool::copy_operands(constantPoolHandle from_cp, |
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1103 constantPoolHandle to_cp, |
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1104 TRAPS) { |
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1105 |
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1106 int from_oplen = operand_array_length(from_cp->operands()); |
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1107 int old_oplen = operand_array_length(to_cp->operands()); |
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1108 if (from_oplen != 0) { |
6934 | 1109 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); |
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1110 // append my operands to the target's operands array |
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1111 if (old_oplen == 0) { |
6934 | 1112 // Can't just reuse from_cp's operand list because of deallocation issues |
1113 int len = from_cp->operands()->length(); | |
1114 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); | |
1115 Copy::conjoint_memory_atomic( | |
1116 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); | |
1117 to_cp->set_operands(new_ops); | |
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1118 } else { |
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1119 int old_len = to_cp->operands()->length(); |
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1120 int from_len = from_cp->operands()->length(); |
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1121 int old_off = old_oplen * sizeof(u2); |
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1122 int from_off = from_oplen * sizeof(u2); |
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1123 // Use the metaspace for the destination constant pool |
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1124 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); |
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1125 int fillp = 0, len = 0; |
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1126 // first part of dest |
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1127 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), |
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1128 new_operands->adr_at(fillp), |
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1129 (len = old_off) * sizeof(u2)); |
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1130 fillp += len; |
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1131 // first part of src |
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1132 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), |
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1133 new_operands->adr_at(fillp), |
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1134 (len = from_off) * sizeof(u2)); |
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1135 fillp += len; |
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1136 // second part of dest |
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1137 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), |
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1138 new_operands->adr_at(fillp), |
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1139 (len = old_len - old_off) * sizeof(u2)); |
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1140 fillp += len; |
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1141 // second part of src |
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1142 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), |
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1143 new_operands->adr_at(fillp), |
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1144 (len = from_len - from_off) * sizeof(u2)); |
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1145 fillp += len; |
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1146 assert(fillp == new_operands->length(), ""); |
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1147 |
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1148 // Adjust indexes in the first part of the copied operands array. |
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1149 for (int j = 0; j < from_oplen; j++) { |
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1150 int offset = operand_offset_at(new_operands, old_oplen + j); |
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1151 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); |
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|
1152 offset += old_len; // every new tuple is preceded by old_len extra u2's |
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1153 operand_offset_at_put(new_operands, old_oplen + j, offset); |
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1154 } |
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1155 |
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1156 // replace target operands array with combined array |
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1157 to_cp->set_operands(new_operands); |
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1158 } |
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1159 } |
7952
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1160 } // end copy_operands() |
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1161 |
7952
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1162 |
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1163 // Copy this constant pool's entries at start_i to end_i (inclusive) |
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1164 // to the constant pool to_cp's entries starting at to_i. A total of |
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1165 // (end_i - start_i) + 1 entries are copied. |
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1166 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, |
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1167 constantPoolHandle to_cp, int to_i, TRAPS) { |
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1168 |
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1169 |
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1170 int dest_i = to_i; // leave original alone for debug purposes |
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1171 |
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1172 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { |
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1173 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); |
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1174 |
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1175 switch (from_cp->tag_at(src_i).value()) { |
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1176 case JVM_CONSTANT_Double: |
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1177 case JVM_CONSTANT_Long: |
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1178 // double and long take two constant pool entries |
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1179 src_i += 2; |
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1180 dest_i += 2; |
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1181 break; |
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1182 |
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1183 default: |
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1184 // all others take one constant pool entry |
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1185 src_i++; |
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1186 dest_i++; |
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1187 break; |
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1188 } |
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1189 } |
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1190 copy_operands(from_cp, to_cp, CHECK); |
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1191 |
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1192 } // end copy_cp_to_impl() |
0 | 1193 |
1194 | |
1195 // Copy this constant pool's entry at from_i to the constant pool | |
1196 // to_cp's entry at to_i. | |
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1197 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i, |
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1198 constantPoolHandle to_cp, int to_i, |
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1199 TRAPS) { |
0 | 1200 |
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1201 int tag = from_cp->tag_at(from_i).value(); |
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1202 switch (tag) { |
0 | 1203 case JVM_CONSTANT_Class: |
1204 { | |
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1205 Klass* k = from_cp->klass_at(from_i, CHECK); |
0 | 1206 to_cp->klass_at_put(to_i, k); |
1207 } break; | |
1208 | |
1209 case JVM_CONSTANT_ClassIndex: | |
1210 { | |
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1211 jint ki = from_cp->klass_index_at(from_i); |
0 | 1212 to_cp->klass_index_at_put(to_i, ki); |
1213 } break; | |
1214 | |
1215 case JVM_CONSTANT_Double: | |
1216 { | |
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1217 jdouble d = from_cp->double_at(from_i); |
0 | 1218 to_cp->double_at_put(to_i, d); |
1219 // double takes two constant pool entries so init second entry's tag | |
1220 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1221 } break; | |
1222 | |
1223 case JVM_CONSTANT_Fieldref: | |
1224 { | |
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1225 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1226 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1227 to_cp->field_at_put(to_i, class_index, name_and_type_index); |
1228 } break; | |
1229 | |
1230 case JVM_CONSTANT_Float: | |
1231 { | |
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1232 jfloat f = from_cp->float_at(from_i); |
0 | 1233 to_cp->float_at_put(to_i, f); |
1234 } break; | |
1235 | |
1236 case JVM_CONSTANT_Integer: | |
1237 { | |
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1238 jint i = from_cp->int_at(from_i); |
0 | 1239 to_cp->int_at_put(to_i, i); |
1240 } break; | |
1241 | |
1242 case JVM_CONSTANT_InterfaceMethodref: | |
1243 { | |
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1244 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1245 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1246 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); |
1247 } break; | |
1248 | |
1249 case JVM_CONSTANT_Long: | |
1250 { | |
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1251 jlong l = from_cp->long_at(from_i); |
0 | 1252 to_cp->long_at_put(to_i, l); |
1253 // long takes two constant pool entries so init second entry's tag | |
1254 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1255 } break; | |
1256 | |
1257 case JVM_CONSTANT_Methodref: | |
1258 { | |
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1259 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1260 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1261 to_cp->method_at_put(to_i, class_index, name_and_type_index); |
1262 } break; | |
1263 | |
1264 case JVM_CONSTANT_NameAndType: | |
1265 { | |
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1266 int name_ref_index = from_cp->name_ref_index_at(from_i); |
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1267 int signature_ref_index = from_cp->signature_ref_index_at(from_i); |
0 | 1268 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); |
1269 } break; | |
1270 | |
1271 case JVM_CONSTANT_StringIndex: | |
1272 { | |
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|
1273 jint si = from_cp->string_index_at(from_i); |
0 | 1274 to_cp->string_index_at_put(to_i, si); |
1275 } break; | |
1276 | |
1277 case JVM_CONSTANT_UnresolvedClass: | |
1278 { | |
2332
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1279 // Can be resolved after checking tag, so check the slot first. |
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1280 CPSlot entry = from_cp->slot_at(from_i); |
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1281 if (entry.is_resolved()) { |
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1282 assert(entry.get_klass()->is_klass(), "must be"); |
2332
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|
1283 // Already resolved |
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1284 to_cp->klass_at_put(to_i, entry.get_klass()); |
2332
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1285 } else { |
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1286 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); |
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1287 } |
0 | 1288 } break; |
1289 | |
1290 case JVM_CONSTANT_UnresolvedClassInError: | |
1291 { | |
2177
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1292 Symbol* k = from_cp->unresolved_klass_at(from_i); |
0 | 1293 to_cp->unresolved_klass_at_put(to_i, k); |
1294 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError); | |
1295 } break; | |
1296 | |
1297 | |
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1298 case JVM_CONSTANT_String: |
0 | 1299 { |
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1300 Symbol* s = from_cp->unresolved_string_at(from_i); |
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1301 to_cp->unresolved_string_at_put(to_i, s); |
0 | 1302 } break; |
1303 | |
1304 case JVM_CONSTANT_Utf8: | |
1305 { | |
2177
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1306 Symbol* s = from_cp->symbol_at(from_i); |
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1307 // Need to increase refcount, the old one will be thrown away and deferenced |
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1308 s->increment_refcount(); |
0 | 1309 to_cp->symbol_at_put(to_i, s); |
1310 } break; | |
1311 | |
1602 | 1312 case JVM_CONSTANT_MethodType: |
1313 { | |
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1314 jint k = from_cp->method_type_index_at(from_i); |
1602 | 1315 to_cp->method_type_index_at_put(to_i, k); |
1316 } break; | |
1317 | |
1318 case JVM_CONSTANT_MethodHandle: | |
1319 { | |
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1320 int k1 = from_cp->method_handle_ref_kind_at(from_i); |
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1321 int k2 = from_cp->method_handle_index_at(from_i); |
1602 | 1322 to_cp->method_handle_index_at_put(to_i, k1, k2); |
1323 } break; | |
1324 | |
1660
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1602
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|
1325 case JVM_CONSTANT_InvokeDynamic: |
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|
1326 { |
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|
1327 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); |
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|
1328 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); |
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1329 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands |
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|
1330 to_cp->invoke_dynamic_at_put(to_i, k1, k2); |
1660
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|
1331 } break; |
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|
1332 |
0 | 1333 // Invalid is used as the tag for the second constant pool entry |
1334 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1335 // not be seen by itself. | |
1336 case JVM_CONSTANT_Invalid: // fall through | |
1337 | |
1338 default: | |
1339 { | |
1340 ShouldNotReachHere(); | |
1341 } break; | |
1342 } | |
1343 } // end copy_entry_to() | |
1344 | |
1345 | |
1346 // Search constant pool search_cp for an entry that matches this | |
1347 // constant pool's entry at pattern_i. Returns the index of a | |
1348 // matching entry or zero (0) if there is no matching entry. | |
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1349 int ConstantPool::find_matching_entry(int pattern_i, |
0 | 1350 constantPoolHandle search_cp, TRAPS) { |
1351 | |
1352 // index zero (0) is not used | |
1353 for (int i = 1; i < search_cp->length(); i++) { | |
1354 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); | |
1355 if (found) { | |
1356 return i; | |
1357 } | |
1358 } | |
1359 | |
1360 return 0; // entry not found; return unused index zero (0) | |
1361 } // end find_matching_entry() | |
1362 | |
1363 | |
1364 #ifndef PRODUCT | |
1365 | |
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1366 const char* ConstantPool::printable_name_at(int which) { |
0 | 1367 |
1368 constantTag tag = tag_at(which); | |
1369 | |
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1370 if (tag.is_string()) { |
0 | 1371 return string_at_noresolve(which); |
1372 } else if (tag.is_klass() || tag.is_unresolved_klass()) { | |
1373 return klass_name_at(which)->as_C_string(); | |
1374 } else if (tag.is_symbol()) { | |
1375 return symbol_at(which)->as_C_string(); | |
1376 } | |
1377 return ""; | |
1378 } | |
1379 | |
1380 #endif // PRODUCT | |
1381 | |
1382 | |
1383 // JVMTI GetConstantPool support | |
1384 | |
1385 // For temporary use until code is stable. | |
1386 #define DBG(code) | |
1387 | |
1388 static const char* WARN_MSG = "Must not be such entry!"; | |
1389 | |
1390 static void print_cpool_bytes(jint cnt, u1 *bytes) { | |
1391 jint size = 0; | |
1392 u2 idx1, idx2; | |
1393 | |
1394 for (jint idx = 1; idx < cnt; idx++) { | |
1395 jint ent_size = 0; | |
1396 u1 tag = *bytes++; | |
1397 size++; // count tag | |
1398 | |
1399 printf("const #%03d, tag: %02d ", idx, tag); | |
1400 switch(tag) { | |
1401 case JVM_CONSTANT_Invalid: { | |
1402 printf("Invalid"); | |
1403 break; | |
1404 } | |
1405 case JVM_CONSTANT_Unicode: { | |
1406 printf("Unicode %s", WARN_MSG); | |
1407 break; | |
1408 } | |
1409 case JVM_CONSTANT_Utf8: { | |
1410 u2 len = Bytes::get_Java_u2(bytes); | |
1411 char str[128]; | |
1412 if (len > 127) { | |
1413 len = 127; | |
1414 } | |
1415 strncpy(str, (char *) (bytes+2), len); | |
1416 str[len] = '\0'; | |
1417 printf("Utf8 \"%s\"", str); | |
1418 ent_size = 2 + len; | |
1419 break; | |
1420 } | |
1421 case JVM_CONSTANT_Integer: { | |
1422 u4 val = Bytes::get_Java_u4(bytes); | |
1423 printf("int %d", *(int *) &val); | |
1424 ent_size = 4; | |
1425 break; | |
1426 } | |
1427 case JVM_CONSTANT_Float: { | |
1428 u4 val = Bytes::get_Java_u4(bytes); | |
1429 printf("float %5.3ff", *(float *) &val); | |
1430 ent_size = 4; | |
1431 break; | |
1432 } | |
1433 case JVM_CONSTANT_Long: { | |
1434 u8 val = Bytes::get_Java_u8(bytes); | |
3960 | 1435 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val); |
0 | 1436 ent_size = 8; |
1437 idx++; // Long takes two cpool slots | |
1438 break; | |
1439 } | |
1440 case JVM_CONSTANT_Double: { | |
1441 u8 val = Bytes::get_Java_u8(bytes); | |
1442 printf("double %5.3fd", *(jdouble *)&val); | |
1443 ent_size = 8; | |
1444 idx++; // Double takes two cpool slots | |
1445 break; | |
1446 } | |
1447 case JVM_CONSTANT_Class: { | |
1448 idx1 = Bytes::get_Java_u2(bytes); | |
1449 printf("class #%03d", idx1); | |
1450 ent_size = 2; | |
1451 break; | |
1452 } | |
1453 case JVM_CONSTANT_String: { | |
1454 idx1 = Bytes::get_Java_u2(bytes); | |
1455 printf("String #%03d", idx1); | |
1456 ent_size = 2; | |
1457 break; | |
1458 } | |
1459 case JVM_CONSTANT_Fieldref: { | |
1460 idx1 = Bytes::get_Java_u2(bytes); | |
1461 idx2 = Bytes::get_Java_u2(bytes+2); | |
1462 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); | |
1463 ent_size = 4; | |
1464 break; | |
1465 } | |
1466 case JVM_CONSTANT_Methodref: { | |
1467 idx1 = Bytes::get_Java_u2(bytes); | |
1468 idx2 = Bytes::get_Java_u2(bytes+2); | |
1469 printf("Method #%03d, #%03d", idx1, idx2); | |
1470 ent_size = 4; | |
1471 break; | |
1472 } | |
1473 case JVM_CONSTANT_InterfaceMethodref: { | |
1474 idx1 = Bytes::get_Java_u2(bytes); | |
1475 idx2 = Bytes::get_Java_u2(bytes+2); | |
1476 printf("InterfMethod #%03d, #%03d", idx1, idx2); | |
1477 ent_size = 4; | |
1478 break; | |
1479 } | |
1480 case JVM_CONSTANT_NameAndType: { | |
1481 idx1 = Bytes::get_Java_u2(bytes); | |
1482 idx2 = Bytes::get_Java_u2(bytes+2); | |
1483 printf("NameAndType #%03d, #%03d", idx1, idx2); | |
1484 ent_size = 4; | |
1485 break; | |
1486 } | |
1487 case JVM_CONSTANT_ClassIndex: { | |
1488 printf("ClassIndex %s", WARN_MSG); | |
1489 break; | |
1490 } | |
1491 case JVM_CONSTANT_UnresolvedClass: { | |
1492 printf("UnresolvedClass: %s", WARN_MSG); | |
1493 break; | |
1494 } | |
1495 case JVM_CONSTANT_UnresolvedClassInError: { | |
1496 printf("UnresolvedClassInErr: %s", WARN_MSG); | |
1497 break; | |
1498 } | |
1499 case JVM_CONSTANT_StringIndex: { | |
1500 printf("StringIndex: %s", WARN_MSG); | |
1501 break; | |
1502 } | |
1503 } | |
1504 printf(";\n"); | |
1505 bytes += ent_size; | |
1506 size += ent_size; | |
1507 } | |
1508 printf("Cpool size: %d\n", size); | |
1509 fflush(0); | |
1510 return; | |
1511 } /* end print_cpool_bytes */ | |
1512 | |
1513 | |
1514 // Returns size of constant pool entry. | |
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1515 jint ConstantPool::cpool_entry_size(jint idx) { |
0 | 1516 switch(tag_at(idx).value()) { |
1517 case JVM_CONSTANT_Invalid: | |
1518 case JVM_CONSTANT_Unicode: | |
1519 return 1; | |
1520 | |
1521 case JVM_CONSTANT_Utf8: | |
1522 return 3 + symbol_at(idx)->utf8_length(); | |
1523 | |
1524 case JVM_CONSTANT_Class: | |
1525 case JVM_CONSTANT_String: | |
1526 case JVM_CONSTANT_ClassIndex: | |
1527 case JVM_CONSTANT_UnresolvedClass: | |
1528 case JVM_CONSTANT_UnresolvedClassInError: | |
1529 case JVM_CONSTANT_StringIndex: | |
1602 | 1530 case JVM_CONSTANT_MethodType: |
0 | 1531 return 3; |
1532 | |
1602 | 1533 case JVM_CONSTANT_MethodHandle: |
1534 return 4; //tag, ref_kind, ref_index | |
1535 | |
0 | 1536 case JVM_CONSTANT_Integer: |
1537 case JVM_CONSTANT_Float: | |
1538 case JVM_CONSTANT_Fieldref: | |
1539 case JVM_CONSTANT_Methodref: | |
1540 case JVM_CONSTANT_InterfaceMethodref: | |
1541 case JVM_CONSTANT_NameAndType: | |
1913
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1542 return 5; |
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1543 |
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1544 case JVM_CONSTANT_InvokeDynamic: |
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1545 // u1 tag, u2 bsm, u2 nt |
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1546 return 5; |
0 | 1547 |
1548 case JVM_CONSTANT_Long: | |
1549 case JVM_CONSTANT_Double: | |
1550 return 9; | |
1551 } | |
1552 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); | |
1553 return 1; | |
1554 } /* end cpool_entry_size */ | |
1555 | |
1556 | |
1557 // SymbolHashMap is used to find a constant pool index from a string. | |
1558 // This function fills in SymbolHashMaps, one for utf8s and one for | |
1559 // class names, returns size of the cpool raw bytes. | |
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1560 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, |
0 | 1561 SymbolHashMap *classmap) { |
1562 jint size = 0; | |
1563 | |
1564 for (u2 idx = 1; idx < length(); idx++) { | |
1565 u2 tag = tag_at(idx).value(); | |
1566 size += cpool_entry_size(idx); | |
1567 | |
1568 switch(tag) { | |
1569 case JVM_CONSTANT_Utf8: { | |
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1570 Symbol* sym = symbol_at(idx); |
0 | 1571 symmap->add_entry(sym, idx); |
1572 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); | |
1573 break; | |
1574 } | |
1575 case JVM_CONSTANT_Class: | |
1576 case JVM_CONSTANT_UnresolvedClass: | |
1577 case JVM_CONSTANT_UnresolvedClassInError: { | |
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1578 Symbol* sym = klass_name_at(idx); |
0 | 1579 classmap->add_entry(sym, idx); |
1580 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); | |
1581 break; | |
1582 } | |
1583 case JVM_CONSTANT_Long: | |
1584 case JVM_CONSTANT_Double: { | |
1585 idx++; // Both Long and Double take two cpool slots | |
1586 break; | |
1587 } | |
1588 } | |
1589 } | |
1590 return size; | |
1591 } /* end hash_utf8_entries_to */ | |
1592 | |
1593 | |
1594 // Copy cpool bytes. | |
1595 // Returns: | |
1596 // 0, in case of OutOfMemoryError | |
1597 // -1, in case of internal error | |
1598 // > 0, count of the raw cpool bytes that have been copied | |
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1599 int ConstantPool::copy_cpool_bytes(int cpool_size, |
0 | 1600 SymbolHashMap* tbl, |
1601 unsigned char *bytes) { | |
1602 u2 idx1, idx2; | |
1603 jint size = 0; | |
1604 jint cnt = length(); | |
1605 unsigned char *start_bytes = bytes; | |
1606 | |
1607 for (jint idx = 1; idx < cnt; idx++) { | |
1608 u1 tag = tag_at(idx).value(); | |
1609 jint ent_size = cpool_entry_size(idx); | |
1610 | |
1611 assert(size + ent_size <= cpool_size, "Size mismatch"); | |
1612 | |
1613 *bytes = tag; | |
1614 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); | |
1615 switch(tag) { | |
1616 case JVM_CONSTANT_Invalid: { | |
1617 DBG(printf("JVM_CONSTANT_Invalid")); | |
1618 break; | |
1619 } | |
1620 case JVM_CONSTANT_Unicode: { | |
1621 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); | |
1622 DBG(printf("JVM_CONSTANT_Unicode")); | |
1623 break; | |
1624 } | |
1625 case JVM_CONSTANT_Utf8: { | |
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1626 Symbol* sym = symbol_at(idx); |
0 | 1627 char* str = sym->as_utf8(); |
1628 // Warning! It's crashing on x86 with len = sym->utf8_length() | |
1629 int len = (int) strlen(str); | |
1630 Bytes::put_Java_u2((address) (bytes+1), (u2) len); | |
1631 for (int i = 0; i < len; i++) { | |
1632 bytes[3+i] = (u1) str[i]; | |
1633 } | |
1634 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); | |
1635 break; | |
1636 } | |
1637 case JVM_CONSTANT_Integer: { | |
1638 jint val = int_at(idx); | |
1639 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1640 break; | |
1641 } | |
1642 case JVM_CONSTANT_Float: { | |
1643 jfloat val = float_at(idx); | |
1644 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1645 break; | |
1646 } | |
1647 case JVM_CONSTANT_Long: { | |
1648 jlong val = long_at(idx); | |
1649 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1650 idx++; // Long takes two cpool slots | |
1651 break; | |
1652 } | |
1653 case JVM_CONSTANT_Double: { | |
1654 jdouble val = double_at(idx); | |
1655 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1656 idx++; // Double takes two cpool slots | |
1657 break; | |
1658 } | |
1659 case JVM_CONSTANT_Class: | |
1660 case JVM_CONSTANT_UnresolvedClass: | |
1661 case JVM_CONSTANT_UnresolvedClassInError: { | |
1662 *bytes = JVM_CONSTANT_Class; | |
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1663 Symbol* sym = klass_name_at(idx); |
0 | 1664 idx1 = tbl->symbol_to_value(sym); |
1665 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1666 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1667 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); | |
1668 break; | |
1669 } | |
1670 case JVM_CONSTANT_String: { | |
1671 *bytes = JVM_CONSTANT_String; | |
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1672 Symbol* sym = unresolved_string_at(idx); |
0 | 1673 idx1 = tbl->symbol_to_value(sym); |
1674 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1675 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1676 DBG(char *str = sym->as_utf8()); | |
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1677 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str)); |
0 | 1678 break; |
1679 } | |
1680 case JVM_CONSTANT_Fieldref: | |
1681 case JVM_CONSTANT_Methodref: | |
1682 case JVM_CONSTANT_InterfaceMethodref: { | |
1683 idx1 = uncached_klass_ref_index_at(idx); | |
1684 idx2 = uncached_name_and_type_ref_index_at(idx); | |
1685 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1686 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1687 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); | |
1688 break; | |
1689 } | |
1690 case JVM_CONSTANT_NameAndType: { | |
1691 idx1 = name_ref_index_at(idx); | |
1692 idx2 = signature_ref_index_at(idx); | |
1693 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1694 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1695 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); | |
1696 break; | |
1697 } | |
1698 case JVM_CONSTANT_ClassIndex: { | |
1699 *bytes = JVM_CONSTANT_Class; | |
1700 idx1 = klass_index_at(idx); | |
1701 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1702 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); | |
1703 break; | |
1704 } | |
1705 case JVM_CONSTANT_StringIndex: { | |
1706 *bytes = JVM_CONSTANT_String; | |
1707 idx1 = string_index_at(idx); | |
1708 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1709 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); | |
1710 break; | |
1711 } | |
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1712 case JVM_CONSTANT_MethodHandle: |
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1713 case JVM_CONSTANT_MethodHandleInError: { |
1602 | 1714 *bytes = JVM_CONSTANT_MethodHandle; |
1715 int kind = method_handle_ref_kind_at(idx); | |
1716 idx1 = method_handle_index_at(idx); | |
1717 *(bytes+1) = (unsigned char) kind; | |
1718 Bytes::put_Java_u2((address) (bytes+2), idx1); | |
1719 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); | |
1720 break; | |
1721 } | |
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1722 case JVM_CONSTANT_MethodType: |
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1723 case JVM_CONSTANT_MethodTypeInError: { |
1602 | 1724 *bytes = JVM_CONSTANT_MethodType; |
1725 idx1 = method_type_index_at(idx); | |
1726 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1727 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); | |
1728 break; | |
1729 } | |
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1730 case JVM_CONSTANT_InvokeDynamic: { |
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1731 *bytes = tag; |
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1732 idx1 = extract_low_short_from_int(*int_at_addr(idx)); |
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1733 idx2 = extract_high_short_from_int(*int_at_addr(idx)); |
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1734 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); |
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1735 Bytes::put_Java_u2((address) (bytes+1), idx1); |
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1736 Bytes::put_Java_u2((address) (bytes+3), idx2); |
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1737 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); |
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1738 break; |
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1739 } |
0 | 1740 } |
1741 DBG(printf("\n")); | |
1742 bytes += ent_size; | |
1743 size += ent_size; | |
1744 } | |
1745 assert(size == cpool_size, "Size mismatch"); | |
1746 | |
1747 // Keep temorarily for debugging until it's stable. | |
1748 DBG(print_cpool_bytes(cnt, start_bytes)); | |
1749 return (int)(bytes - start_bytes); | |
1750 } /* end copy_cpool_bytes */ | |
1751 | |
1752 | |
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1753 void ConstantPool::set_on_stack(const bool value) { |
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1754 if (value) { |
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1755 _flags |= _on_stack; |
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1756 } else { |
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1757 _flags &= ~_on_stack; |
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1758 } |
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1759 if (value) MetadataOnStackMark::record(this); |
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1760 } |
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1761 |
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1762 // JSR 292 support for patching constant pool oops after the class is linked and |
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1763 // the oop array for resolved references are created. |
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1764 // We can't do this during classfile parsing, which is how the other indexes are |
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1765 // patched. The other patches are applied early for some error checking |
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1766 // so only defer the pseudo_strings. |
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1767 void ConstantPool::patch_resolved_references( |
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1768 GrowableArray<Handle>* cp_patches) { |
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1769 assert(EnableInvokeDynamic, ""); |
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1770 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused |
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1771 Handle patch = cp_patches->at(index); |
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1772 if (patch.not_null()) { |
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1773 assert (tag_at(index).is_string(), "should only be string left"); |
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1774 // Patching a string means pre-resolving it. |
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1775 // The spelling in the constant pool is ignored. |
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1776 // The constant reference may be any object whatever. |
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1777 // If it is not a real interned string, the constant is referred |
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1778 // to as a "pseudo-string", and must be presented to the CP |
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1779 // explicitly, because it may require scavenging. |
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1780 int obj_index = cp_to_object_index(index); |
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1781 pseudo_string_at_put(index, obj_index, patch()); |
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1782 DEBUG_ONLY(cp_patches->at_put(index, Handle());) |
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1783 } |
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1784 } |
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1785 #ifdef ASSERT |
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1786 // Ensure that all the patches have been used. |
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1787 for (int index = 0; index < cp_patches->length(); index++) { |
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1788 assert(cp_patches->at(index).is_null(), |
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1789 err_msg("Unused constant pool patch at %d in class file %s", |
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1790 index, |
6940
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8000725: NPG: method_holder() and pool_holder() and pool_holder field should be InstanceKlass
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1791 pool_holder()->external_name())); |
6725
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1792 } |
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1793 #endif // ASSERT |
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1794 } |
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1795 |
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1796 #ifndef PRODUCT |
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1797 |
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1798 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool |
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1799 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { |
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1800 guarantee(obj->is_constantPool(), "object must be constant pool"); |
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1801 constantPoolHandle cp(THREAD, (ConstantPool*)obj); |
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1802 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); |
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1803 |
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1804 for (int i = 0; i< cp->length(); i++) { |
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1805 if (cp->tag_at(i).is_unresolved_klass()) { |
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1806 // This will force loading of the class |
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1807 Klass* klass = cp->klass_at(i, CHECK); |
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1808 if (klass->oop_is_instance()) { |
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1809 // Force initialization of class |
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1810 InstanceKlass::cast(klass)->initialize(CHECK); |
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1811 } |
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1812 } |
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1813 } |
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1814 } |
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1815 |
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1816 #endif |
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1817 |
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1818 |
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1819 // Printing |
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1820 |
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1821 void ConstantPool::print_on(outputStream* st) const { |
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1822 EXCEPTION_MARK; |
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1823 assert(is_constantPool(), "must be constantPool"); |
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1824 st->print_cr(internal_name()); |
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1825 if (flags() != 0) { |
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1826 st->print(" - flags: 0x%x", flags()); |
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1827 if (has_pseudo_string()) st->print(" has_pseudo_string"); |
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1828 if (has_invokedynamic()) st->print(" has_invokedynamic"); |
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1829 if (has_preresolution()) st->print(" has_preresolution"); |
7949
5daaddd917a1
8006040: NPG: on_stack processing wastes space in ConstantPool
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1830 if (on_stack()) st->print(" on_stack"); |
6725
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1831 st->cr(); |
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1832 } |
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1833 if (pool_holder() != NULL) { |
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1834 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder()); |
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1835 } |
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1836 st->print_cr(" - cache: " INTPTR_FORMAT, cache()); |
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1837 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references()); |
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1838 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map()); |
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1839 |
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1840 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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1841 ((ConstantPool*)this)->print_entry_on(index, st); |
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1842 switch (tag_at(index).value()) { |
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1843 case JVM_CONSTANT_Long : |
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1844 case JVM_CONSTANT_Double : |
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1845 index++; // Skip entry following eigth-byte constant |
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1846 } |
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1847 |
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1848 } |
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1849 st->cr(); |
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|
1850 } |
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|
1851 |
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1852 // Print one constant pool entry |
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1853 void ConstantPool::print_entry_on(const int index, outputStream* st) { |
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1854 EXCEPTION_MARK; |
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1855 st->print(" - %3d : ", index); |
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1856 tag_at(index).print_on(st); |
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1857 st->print(" : "); |
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1858 switch (tag_at(index).value()) { |
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1859 case JVM_CONSTANT_Class : |
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1860 { Klass* k = klass_at(index, CATCH); |
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1861 k->print_value_on(st); |
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1862 st->print(" {0x%lx}", (address)k); |
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1863 } |
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1864 break; |
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1865 case JVM_CONSTANT_Fieldref : |
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1866 case JVM_CONSTANT_Methodref : |
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1867 case JVM_CONSTANT_InterfaceMethodref : |
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1868 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); |
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1869 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); |
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1870 break; |
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1871 case JVM_CONSTANT_String : |
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1872 unresolved_string_at(index)->print_value_on(st); |
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|
1873 break; |
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1874 case JVM_CONSTANT_Object : { |
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1875 oop anObj = object_at(index); |
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1876 anObj->print_value_on(st); |
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1877 st->print(" {0x%lx}", (address)anObj); |
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1878 } break; |
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1879 case JVM_CONSTANT_Integer : |
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1880 st->print("%d", int_at(index)); |
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1881 break; |
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1882 case JVM_CONSTANT_Float : |
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1883 st->print("%f", float_at(index)); |
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1884 break; |
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1885 case JVM_CONSTANT_Long : |
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1886 st->print_jlong(long_at(index)); |
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1887 break; |
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1888 case JVM_CONSTANT_Double : |
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1889 st->print("%lf", double_at(index)); |
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1890 break; |
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1891 case JVM_CONSTANT_NameAndType : |
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1892 st->print("name_index=%d", name_ref_index_at(index)); |
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1893 st->print(" signature_index=%d", signature_ref_index_at(index)); |
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1894 break; |
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1895 case JVM_CONSTANT_Utf8 : |
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1896 symbol_at(index)->print_value_on(st); |
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1897 break; |
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1898 case JVM_CONSTANT_UnresolvedClass : // fall-through |
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1899 case JVM_CONSTANT_UnresolvedClassInError: { |
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1900 // unresolved_klass_at requires lock or safe world. |
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1901 CPSlot entry = slot_at(index); |
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1902 if (entry.is_resolved()) { |
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1903 entry.get_klass()->print_value_on(st); |
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1904 } else { |
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1905 entry.get_symbol()->print_value_on(st); |
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1906 } |
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1907 } |
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1908 break; |
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1909 case JVM_CONSTANT_MethodHandle : |
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1910 case JVM_CONSTANT_MethodHandleInError : |
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1911 st->print("ref_kind=%d", method_handle_ref_kind_at(index)); |
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1912 st->print(" ref_index=%d", method_handle_index_at(index)); |
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1913 break; |
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1914 case JVM_CONSTANT_MethodType : |
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1915 case JVM_CONSTANT_MethodTypeInError : |
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1916 st->print("signature_index=%d", method_type_index_at(index)); |
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1917 break; |
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1918 case JVM_CONSTANT_InvokeDynamic : |
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1919 { |
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1920 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); |
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1921 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); |
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1922 int argc = invoke_dynamic_argument_count_at(index); |
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1923 if (argc > 0) { |
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1924 for (int arg_i = 0; arg_i < argc; arg_i++) { |
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1925 int arg = invoke_dynamic_argument_index_at(index, arg_i); |
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1926 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); |
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1927 } |
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1928 st->print("}"); |
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1929 } |
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1930 } |
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1931 break; |
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1932 default: |
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1933 ShouldNotReachHere(); |
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1934 break; |
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1935 } |
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1936 st->cr(); |
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1937 } |
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1938 |
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1939 void ConstantPool::print_value_on(outputStream* st) const { |
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1940 assert(is_constantPool(), "must be constantPool"); |
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1941 st->print("constant pool [%d]", length()); |
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1942 if (has_pseudo_string()) st->print("/pseudo_string"); |
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1943 if (has_invokedynamic()) st->print("/invokedynamic"); |
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1944 if (has_preresolution()) st->print("/preresolution"); |
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1945 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); |
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1946 print_address_on(st); |
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1947 st->print(" for "); |
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1948 pool_holder()->print_value_on(st); |
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1949 if (pool_holder() != NULL) { |
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1950 bool extra = (pool_holder()->constants() != this); |
6725
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1951 if (extra) st->print(" (extra)"); |
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1952 } |
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1953 if (cache() != NULL) { |
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1954 st->print(" cache=" PTR_FORMAT, cache()); |
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1955 } |
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1956 } |
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1957 |
7956 | 1958 #if INCLUDE_SERVICES |
1959 // Size Statistics | |
1960 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { | |
1961 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); | |
1962 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); | |
1963 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); | |
1964 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); | |
1965 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); | |
1966 | |
1967 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + | |
1968 sz->_cp_refmap_bytes; | |
1969 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; | |
1970 } | |
1971 #endif // INCLUDE_SERVICES | |
6725
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1972 |
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1973 // Verification |
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1974 |
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1975 void ConstantPool::verify_on(outputStream* st) { |
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1976 guarantee(is_constantPool(), "object must be constant pool"); |
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1977 for (int i = 0; i< length(); i++) { |
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1978 constantTag tag = tag_at(i); |
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1979 CPSlot entry = slot_at(i); |
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1980 if (tag.is_klass()) { |
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1981 if (entry.is_resolved()) { |
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1982 guarantee(entry.get_klass()->is_metadata(), "should be metadata"); |
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1983 guarantee(entry.get_klass()->is_klass(), "should be klass"); |
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1984 } |
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1985 } else if (tag.is_unresolved_klass()) { |
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1986 if (entry.is_resolved()) { |
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1987 guarantee(entry.get_klass()->is_metadata(), "should be metadata"); |
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1988 guarantee(entry.get_klass()->is_klass(), "should be klass"); |
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1989 } |
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1990 } else if (tag.is_symbol()) { |
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1991 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
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1992 } else if (tag.is_string()) { |
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1993 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
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1994 } |
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1995 } |
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1996 if (cache() != NULL) { |
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1997 // Note: cache() can be NULL before a class is completely setup or |
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1998 // in temporary constant pools used during constant pool merging |
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1999 guarantee(cache()->is_metadata(), "should be metadata"); |
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2000 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); |
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2001 } |
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2002 if (pool_holder() != NULL) { |
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2003 // Note: pool_holder() can be NULL in temporary constant pools |
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2004 // used during constant pool merging |
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2005 guarantee(pool_holder()->is_metadata(), "should be metadata"); |
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2006 guarantee(pool_holder()->is_klass(), "should be klass"); |
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2007 } |
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2008 } |
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2009 |
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2010 |
2177
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2011 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { |
0 | 2012 char *str = sym->as_utf8(); |
2013 unsigned int hash = compute_hash(str, sym->utf8_length()); | |
2014 unsigned int index = hash % table_size(); | |
2015 | |
2016 // check if already in map | |
2017 // we prefer the first entry since it is more likely to be what was used in | |
2018 // the class file | |
2019 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2020 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2021 if (en->hash() == hash && en->symbol() == sym) { | |
2022 return; // already there | |
2023 } | |
2024 } | |
2025 | |
2026 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); | |
2027 entry->set_next(bucket(index)); | |
2028 _buckets[index].set_entry(entry); | |
2029 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2030 } | |
2031 | |
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2032 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { |
0 | 2033 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); |
2034 char *str = sym->as_utf8(); | |
2035 int len = sym->utf8_length(); | |
2036 unsigned int hash = SymbolHashMap::compute_hash(str, len); | |
2037 unsigned int index = hash % table_size(); | |
2038 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2039 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2040 if (en->hash() == hash && en->symbol() == sym) { | |
2041 return en; | |
2042 } | |
2043 } | |
2044 return NULL; | |
2045 } |