Mercurial > hg > graal-compiler
annotate src/share/vm/oops/constantPool.cpp @ 12294:891687731b59
7009641: Don't fail VM when CodeCache is full
Summary: Allocation in the code cache returns NULL instead of failing the entire VM
Reviewed-by: kvn, iveresov
author | anoll |
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date | Tue, 24 Sep 2013 15:56:25 +0200 |
parents | b2e698d2276c |
children | a7609ec351d6 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
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26 #include "classfile/classLoaderData.hpp" |
1972 | 27 #include "classfile/javaClasses.hpp" |
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28 #include "classfile/metadataOnStackMark.hpp" |
1972 | 29 #include "classfile/symbolTable.hpp" |
30 #include "classfile/systemDictionary.hpp" | |
31 #include "classfile/vmSymbols.hpp" | |
32 #include "interpreter/linkResolver.hpp" | |
7956 | 33 #include "memory/heapInspection.hpp" |
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34 #include "memory/metadataFactory.hpp" |
1972 | 35 #include "memory/oopFactory.hpp" |
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36 #include "oops/constantPool.hpp" |
1972 | 37 #include "oops/instanceKlass.hpp" |
38 #include "oops/objArrayKlass.hpp" | |
39 #include "runtime/fieldType.hpp" | |
40 #include "runtime/init.hpp" | |
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41 #include "runtime/javaCalls.hpp" |
1972 | 42 #include "runtime/signature.hpp" |
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43 #include "runtime/synchronizer.hpp" |
1972 | 44 #include "runtime/vframe.hpp" |
0 | 45 |
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46 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { |
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47 // Tags are RW but comment below applies to tags also. |
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48 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); |
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49 |
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50 int size = ConstantPool::size(length); |
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51 |
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52 // CDS considerations: |
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53 // Allocate read-write but may be able to move to read-only at dumping time |
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54 // if all the klasses are resolved. The only other field that is writable is |
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55 // the resolved_references array, which is recreated at startup time. |
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56 // But that could be moved to InstanceKlass (although a pain to access from |
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57 // assembly code). Maybe it could be moved to the cpCache which is RW. |
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58 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); |
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59 } |
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60 |
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61 ConstantPool::ConstantPool(Array<u1>* tags) { |
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62 set_length(tags->length()); |
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63 set_tags(NULL); |
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64 set_cache(NULL); |
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65 set_reference_map(NULL); |
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66 set_resolved_references(NULL); |
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67 set_operands(NULL); |
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68 set_pool_holder(NULL); |
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69 set_flags(0); |
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70 |
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71 // only set to non-zero if constant pool is merged by RedefineClasses |
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72 set_version(0); |
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73 |
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74 // initialize tag array |
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75 int length = tags->length(); |
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76 for (int index = 0; index < length; index++) { |
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77 tags->at_put(index, JVM_CONSTANT_Invalid); |
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78 } |
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79 set_tags(tags); |
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80 } |
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81 |
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82 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { |
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83 MetadataFactory::free_metadata(loader_data, cache()); |
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84 set_cache(NULL); |
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85 MetadataFactory::free_array<jushort>(loader_data, operands()); |
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86 set_operands(NULL); |
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87 |
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88 release_C_heap_structures(); |
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89 |
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90 // free tag array |
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91 MetadataFactory::free_array<u1>(loader_data, tags()); |
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92 set_tags(NULL); |
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93 } |
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94 |
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95 void ConstantPool::release_C_heap_structures() { |
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96 // walk constant pool and decrement symbol reference counts |
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97 unreference_symbols(); |
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98 } |
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99 |
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100 objArrayOop ConstantPool::resolved_references() const { |
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101 return (objArrayOop)JNIHandles::resolve(_resolved_references); |
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102 } |
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103 |
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104 // Create resolved_references array and mapping array for original cp indexes |
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105 // The ldc bytecode was rewritten to have the resolved reference array index so need a way |
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106 // to map it back for resolving and some unlikely miscellaneous uses. |
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107 // The objects created by invokedynamic are appended to this list. |
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108 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, |
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109 intStack reference_map, |
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110 int constant_pool_map_length, |
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111 TRAPS) { |
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112 // Initialized the resolved object cache. |
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113 int map_length = reference_map.length(); |
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114 if (map_length > 0) { |
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115 // Only need mapping back to constant pool entries. The map isn't used for |
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116 // invokedynamic resolved_reference entries. The constant pool cache index |
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117 // has the mapping back to both the constant pool and to the resolved |
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118 // reference index. |
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119 if (constant_pool_map_length > 0) { |
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120 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, map_length, CHECK); |
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121 |
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122 for (int i = 0; i < constant_pool_map_length; i++) { |
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123 int x = reference_map.at(i); |
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124 assert(x == (int)(jushort) x, "klass index is too big"); |
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125 om->at_put(i, (jushort)x); |
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126 } |
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127 set_reference_map(om); |
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128 } |
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129 |
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130 // Create Java array for holding resolved strings, methodHandles, |
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131 // methodTypes, invokedynamic and invokehandle appendix objects, etc. |
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132 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); |
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133 Handle refs_handle (THREAD, (oop)stom); // must handleize. |
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134 set_resolved_references(loader_data->add_handle(refs_handle)); |
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135 } |
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136 } |
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137 |
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138 // CDS support. Create a new resolved_references array. |
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139 void ConstantPool::restore_unshareable_info(TRAPS) { |
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140 |
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141 // restore the C++ vtable from the shared archive |
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142 restore_vtable(); |
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143 |
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144 if (SystemDictionary::Object_klass_loaded()) { |
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145 // Recreate the object array and add to ClassLoaderData. |
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146 int map_length = resolved_reference_length(); |
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147 if (map_length > 0) { |
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148 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); |
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149 Handle refs_handle (THREAD, (oop)stom); // must handleize. |
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150 |
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151 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
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152 set_resolved_references(loader_data->add_handle(refs_handle)); |
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153 } |
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154 } |
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155 } |
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156 |
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157 void ConstantPool::remove_unshareable_info() { |
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158 // Resolved references are not in the shared archive. |
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159 // Save the length for restoration. It is not necessarily the same length |
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160 // as reference_map.length() if invokedynamic is saved. |
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161 set_resolved_reference_length( |
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162 resolved_references() != NULL ? resolved_references()->length() : 0); |
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163 set_resolved_references(NULL); |
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164 } |
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165 |
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166 oop ConstantPool::lock() { |
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167 if (_pool_holder) { |
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168 // We re-use the _pool_holder's init_lock to reduce footprint. |
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169 // Notes on deadlocks: |
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170 // [1] This lock is a Java oop, so it can be recursively locked by |
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171 // the same thread without self-deadlocks. |
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172 // [2] Deadlock will happen if there is circular dependency between |
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173 // the <clinit> of two Java classes. However, in this case, |
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174 // the deadlock would have happened long before we reach |
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175 // ConstantPool::lock(), so reusing init_lock does not |
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176 // increase the possibility of deadlock. |
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177 return _pool_holder->init_lock(); |
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178 } else { |
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179 return NULL; |
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180 } |
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181 } |
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182 |
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183 int ConstantPool::cp_to_object_index(int cp_index) { |
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184 // this is harder don't do this so much. |
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185 for (int i = 0; i< reference_map()->length(); i++) { |
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186 if (reference_map()->at(i) == cp_index) return i; |
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187 // Zero entry is divider between constant pool indices for strings, |
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188 // method handles and method types. After that the index is a constant |
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189 // pool cache index for invokedynamic. Stop when zero (which can never |
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190 // be a constant pool index) |
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191 if (reference_map()->at(i) == 0) break; |
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192 } |
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193 // We might not find the index. |
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194 return _no_index_sentinel; |
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195 } |
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196 |
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197 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) { |
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198 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
0 | 199 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and |
200 // tag is not updated atomicly. | |
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201 |
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202 CPSlot entry = this_oop->slot_at(which); |
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203 if (entry.is_resolved()) { |
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204 assert(entry.get_klass()->is_klass(), "must be"); |
0 | 205 // Already resolved - return entry. |
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206 return entry.get_klass(); |
0 | 207 } |
208 | |
209 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object | |
210 // already has updated the object | |
211 assert(THREAD->is_Java_thread(), "must be a Java thread"); | |
212 bool do_resolve = false; | |
213 bool in_error = false; | |
214 | |
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215 // Create a handle for the mirror. This will preserve the resolved class |
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216 // until the loader_data is registered. |
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217 Handle mirror_handle; |
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218 |
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219 Symbol* name = NULL; |
0 | 220 Handle loader; |
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221 { |
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222 oop cplock = this_oop->lock(); |
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223 ObjectLocker ol(cplock , THREAD, cplock != NULL); |
0 | 224 |
225 if (this_oop->tag_at(which).is_unresolved_klass()) { | |
226 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
227 in_error = true; | |
228 } else { | |
229 do_resolve = true; | |
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230 name = this_oop->unresolved_klass_at(which); |
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231 loader = Handle(THREAD, this_oop->pool_holder()->class_loader()); |
0 | 232 } |
233 } | |
234 } // unlocking constantPool | |
235 | |
236 | |
237 // The original attempt to resolve this constant pool entry failed so find the | |
238 // original error and throw it again (JVMS 5.4.3). | |
239 if (in_error) { | |
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240 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which); |
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241 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); |
0 | 242 ResourceMark rm; |
243 // exception text will be the class name | |
244 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
245 THROW_MSG_0(error, className); | |
246 } | |
247 | |
248 if (do_resolve) { | |
249 // this_oop must be unlocked during resolve_or_fail | |
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250 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 251 Handle h_prot (THREAD, protection_domain); |
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252 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD); |
0 | 253 KlassHandle k; |
254 if (!HAS_PENDING_EXCEPTION) { | |
255 k = KlassHandle(THREAD, k_oop); | |
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256 // preserve the resolved klass. |
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257 mirror_handle = Handle(THREAD, k_oop->java_mirror()); |
0 | 258 // Do access check for klasses |
259 verify_constant_pool_resolve(this_oop, k, THREAD); | |
260 } | |
261 | |
262 // Failed to resolve class. We must record the errors so that subsequent attempts | |
263 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). | |
264 if (HAS_PENDING_EXCEPTION) { | |
265 ResourceMark rm; | |
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266 Symbol* error = PENDING_EXCEPTION->klass()->name(); |
0 | 267 |
268 bool throw_orig_error = false; | |
269 { | |
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270 oop cplock = this_oop->lock(); |
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271 ObjectLocker ol(cplock, THREAD, cplock != NULL); |
0 | 272 |
273 // some other thread has beaten us and has resolved the class. | |
274 if (this_oop->tag_at(which).is_klass()) { | |
275 CLEAR_PENDING_EXCEPTION; | |
276 entry = this_oop->resolved_klass_at(which); | |
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277 return entry.get_klass(); |
0 | 278 } |
279 | |
280 if (!PENDING_EXCEPTION-> | |
1142 | 281 is_a(SystemDictionary::LinkageError_klass())) { |
0 | 282 // Just throw the exception and don't prevent these classes from |
283 // being loaded due to virtual machine errors like StackOverflow | |
284 // and OutOfMemoryError, etc, or if the thread was hit by stop() | |
285 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) | |
286 } | |
287 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
288 SystemDictionary::add_resolution_error(this_oop, which, error); | |
289 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError); | |
290 } else { | |
291 // some other thread has put the class in error state. | |
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292 error = SystemDictionary::find_resolution_error(this_oop, which); |
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293 assert(error != NULL, "checking"); |
0 | 294 throw_orig_error = true; |
295 } | |
296 } // unlocked | |
297 | |
298 if (throw_orig_error) { | |
299 CLEAR_PENDING_EXCEPTION; | |
300 ResourceMark rm; | |
301 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
302 THROW_MSG_0(error, className); | |
303 } | |
304 | |
305 return 0; | |
306 } | |
307 | |
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308 if (TraceClassResolution && !k()->oop_is_array()) { |
0 | 309 // skip resolving the constant pool so that this code get's |
310 // called the next time some bytecodes refer to this class. | |
311 ResourceMark rm; | |
312 int line_number = -1; | |
313 const char * source_file = NULL; | |
314 if (JavaThread::current()->has_last_Java_frame()) { | |
315 // try to identify the method which called this function. | |
316 vframeStream vfst(JavaThread::current()); | |
317 if (!vfst.at_end()) { | |
318 line_number = vfst.method()->line_number_from_bci(vfst.bci()); | |
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319 Symbol* s = vfst.method()->method_holder()->source_file_name(); |
0 | 320 if (s != NULL) { |
321 source_file = s->as_C_string(); | |
322 } | |
323 } | |
324 } | |
325 if (k() != this_oop->pool_holder()) { | |
326 // only print something if the classes are different | |
327 if (source_file != NULL) { | |
328 tty->print("RESOLVE %s %s %s:%d\n", | |
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329 this_oop->pool_holder()->external_name(), |
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330 InstanceKlass::cast(k())->external_name(), source_file, line_number); |
0 | 331 } else { |
332 tty->print("RESOLVE %s %s\n", | |
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333 this_oop->pool_holder()->external_name(), |
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334 InstanceKlass::cast(k())->external_name()); |
0 | 335 } |
336 } | |
337 return k(); | |
338 } else { | |
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339 oop cplock = this_oop->lock(); |
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340 ObjectLocker ol(cplock, THREAD, cplock != NULL); |
0 | 341 // Only updated constant pool - if it is resolved. |
342 do_resolve = this_oop->tag_at(which).is_unresolved_klass(); | |
343 if (do_resolve) { | |
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344 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data(); |
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345 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM |
0 | 346 this_oop->klass_at_put(which, k()); |
347 } | |
348 } | |
349 } | |
350 | |
351 entry = this_oop->resolved_klass_at(which); | |
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352 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); |
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353 return entry.get_klass(); |
0 | 354 } |
355 | |
356 | |
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357 // Does not update ConstantPool* - to avoid any exception throwing. Used |
0 | 358 // by compiler and exception handling. Also used to avoid classloads for |
359 // instanceof operations. Returns NULL if the class has not been loaded or | |
360 // if the verification of constant pool failed | |
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361 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) { |
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362 CPSlot entry = this_oop->slot_at(which); |
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363 if (entry.is_resolved()) { |
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364 assert(entry.get_klass()->is_klass(), "must be"); |
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365 return entry.get_klass(); |
0 | 366 } else { |
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367 assert(entry.is_unresolved(), "must be either symbol or klass"); |
0 | 368 Thread *thread = Thread::current(); |
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369 Symbol* name = entry.get_symbol(); |
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370 oop loader = this_oop->pool_holder()->class_loader(); |
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371 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 372 Handle h_prot (thread, protection_domain); |
373 Handle h_loader (thread, loader); | |
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374 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); |
0 | 375 |
376 if (k != NULL) { | |
377 // Make sure that resolving is legal | |
378 EXCEPTION_MARK; | |
379 KlassHandle klass(THREAD, k); | |
380 // return NULL if verification fails | |
381 verify_constant_pool_resolve(this_oop, klass, THREAD); | |
382 if (HAS_PENDING_EXCEPTION) { | |
383 CLEAR_PENDING_EXCEPTION; | |
384 return NULL; | |
385 } | |
386 return klass(); | |
387 } else { | |
388 return k; | |
389 } | |
390 } | |
391 } | |
392 | |
393 | |
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394 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) { |
0 | 395 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which)); |
396 } | |
397 | |
398 | |
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399 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool, |
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400 int which) { |
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401 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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402 int cache_index = decode_cpcache_index(which, true); |
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403 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { |
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404 // FIXME: should be an assert |
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405 if (PrintMiscellaneous && (Verbose||WizardMode)) { |
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406 tty->print_cr("bad operand %d in:", which); cpool->print(); |
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407 } |
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408 return NULL; |
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409 } |
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410 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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411 return e->method_if_resolved(cpool); |
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412 } |
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413 |
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414 |
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415 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) { |
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416 if (cpool->cache() == NULL) return false; // nothing to load yet |
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417 int cache_index = decode_cpcache_index(which, true); |
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418 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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419 return e->has_appendix(); |
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420 } |
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421 |
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422 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) { |
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423 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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424 int cache_index = decode_cpcache_index(which, true); |
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425 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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426 return e->appendix_if_resolved(cpool); |
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427 } |
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428 |
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429 |
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430 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) { |
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431 if (cpool->cache() == NULL) return false; // nothing to load yet |
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432 int cache_index = decode_cpcache_index(which, true); |
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433 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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434 return e->has_method_type(); |
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435 } |
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436 |
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437 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) { |
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438 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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439 int cache_index = decode_cpcache_index(which, true); |
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440 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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441 return e->method_type_if_resolved(cpool); |
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442 } |
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443 |
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444 |
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445 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { |
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446 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
0 | 447 return symbol_at(name_index); |
448 } | |
449 | |
450 | |
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451 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { |
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452 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
0 | 453 return symbol_at(signature_index); |
454 } | |
455 | |
456 | |
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457 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { |
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458 int i = which; |
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459 if (!uncached && cache() != NULL) { |
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460 if (ConstantPool::is_invokedynamic_index(which)) { |
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461 // Invokedynamic index is index into resolved_references |
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462 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); |
2460 | 463 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); |
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464 assert(tag_at(pool_index).is_name_and_type(), ""); |
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465 return pool_index; |
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466 } |
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467 // change byte-ordering and go via cache |
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468 i = remap_instruction_operand_from_cache(which); |
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469 } else { |
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470 if (tag_at(which).is_invoke_dynamic()) { |
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471 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); |
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472 assert(tag_at(pool_index).is_name_and_type(), ""); |
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473 return pool_index; |
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474 } |
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475 } |
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476 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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477 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); |
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478 jint ref_index = *int_at_addr(i); |
0 | 479 return extract_high_short_from_int(ref_index); |
480 } | |
481 | |
482 | |
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483 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { |
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484 guarantee(!ConstantPool::is_invokedynamic_index(which), |
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485 "an invokedynamic instruction does not have a klass"); |
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486 int i = which; |
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487 if (!uncached && cache() != NULL) { |
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488 // change byte-ordering and go via cache |
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489 i = remap_instruction_operand_from_cache(which); |
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490 } |
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491 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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492 jint ref_index = *int_at_addr(i); |
0 | 493 return extract_low_short_from_int(ref_index); |
494 } | |
495 | |
496 | |
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497 |
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498 int ConstantPool::remap_instruction_operand_from_cache(int operand) { |
1565 | 499 int cpc_index = operand; |
500 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); | |
501 assert((int)(u2)cpc_index == cpc_index, "clean u2"); | |
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502 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); |
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503 return member_index; |
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504 } |
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505 |
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506 |
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507 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) { |
0 | 508 if (k->oop_is_instance() || k->oop_is_objArray()) { |
509 instanceKlassHandle holder (THREAD, this_oop->pool_holder()); | |
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510 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); |
0 | 511 KlassHandle element (THREAD, elem_oop); |
512 | |
513 // The element type could be a typeArray - we only need the access check if it is | |
514 // an reference to another class | |
515 if (element->oop_is_instance()) { | |
516 LinkResolver::check_klass_accessability(holder, element, CHECK); | |
517 } | |
518 } | |
519 } | |
520 | |
521 | |
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522 int ConstantPool::name_ref_index_at(int which_nt) { |
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523 jint ref_index = name_and_type_at(which_nt); |
0 | 524 return extract_low_short_from_int(ref_index); |
525 } | |
526 | |
527 | |
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528 int ConstantPool::signature_ref_index_at(int which_nt) { |
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529 jint ref_index = name_and_type_at(which_nt); |
0 | 530 return extract_high_short_from_int(ref_index); |
531 } | |
532 | |
533 | |
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534 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { |
0 | 535 return klass_at(klass_ref_index_at(which), CHECK_NULL); |
536 } | |
537 | |
538 | |
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539 Symbol* ConstantPool::klass_name_at(int which) { |
0 | 540 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), |
541 "Corrupted constant pool"); | |
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542 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
0 | 543 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and |
544 // tag is not updated atomicly. | |
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545 CPSlot entry = slot_at(which); |
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546 if (entry.is_resolved()) { |
0 | 547 // Already resolved - return entry's name. |
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548 assert(entry.get_klass()->is_klass(), "must be"); |
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549 return entry.get_klass()->name(); |
0 | 550 } else { |
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551 assert(entry.is_unresolved(), "must be either symbol or klass"); |
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552 return entry.get_symbol(); |
0 | 553 } |
554 } | |
555 | |
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556 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { |
0 | 557 jint ref_index = klass_ref_index_at(which); |
558 return klass_at_noresolve(ref_index); | |
559 } | |
560 | |
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561 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { |
1602 | 562 jint ref_index = uncached_klass_ref_index_at(which); |
563 return klass_at_noresolve(ref_index); | |
564 } | |
565 | |
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566 char* ConstantPool::string_at_noresolve(int which) { |
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567 Symbol* s = unresolved_string_at(which); |
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568 if (s == NULL) { |
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569 return (char*)"<pseudo-string>"; |
0 | 570 } else { |
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571 return unresolved_string_at(which)->as_C_string(); |
0 | 572 } |
573 } | |
574 | |
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575 BasicType ConstantPool::basic_type_for_signature_at(int which) { |
0 | 576 return FieldType::basic_type(symbol_at(which)); |
577 } | |
578 | |
579 | |
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580 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) { |
0 | 581 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused |
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582 if (this_oop->tag_at(index).is_string()) { |
0 | 583 this_oop->string_at(index, CHECK); |
584 } | |
585 } | |
586 } | |
587 | |
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588 // Resolve all the classes in the constant pool. If they are all resolved, |
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589 // the constant pool is read-only. Enhancement: allocate cp entries to |
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590 // another metaspace, and copy to read-only or read-write space if this |
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591 // bit is set. |
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592 bool ConstantPool::resolve_class_constants(TRAPS) { |
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593 constantPoolHandle cp(THREAD, this); |
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594 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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595 if (tag_at(index).is_unresolved_klass() && |
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596 klass_at_if_loaded(cp, index) == NULL) { |
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597 return false; |
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598 } |
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599 } |
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600 // set_preresolution(); or some bit for future use |
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601 return true; |
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602 } |
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603 |
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604 // If resolution for MethodHandle or MethodType fails, save the exception |
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605 // in the resolution error table, so that the same exception is thrown again. |
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606 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which, |
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607 int tag, TRAPS) { |
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608 ResourceMark rm; |
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609 Symbol* error = PENDING_EXCEPTION->klass()->name(); |
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610 oop cplock = this_oop->lock(); |
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611 ObjectLocker ol(cplock, THREAD, cplock != NULL); // lock cpool to change tag. |
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612 |
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613 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ? |
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614 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError; |
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615 |
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616 if (!PENDING_EXCEPTION-> |
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617 is_a(SystemDictionary::LinkageError_klass())) { |
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618 // Just throw the exception and don't prevent these classes from |
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619 // being loaded due to virtual machine errors like StackOverflow |
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620 // and OutOfMemoryError, etc, or if the thread was hit by stop() |
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621 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) |
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622 |
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623 } else if (this_oop->tag_at(which).value() != error_tag) { |
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624 SystemDictionary::add_resolution_error(this_oop, which, error); |
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625 this_oop->tag_at_put(which, error_tag); |
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626 } else { |
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627 // some other thread has put the class in error state. |
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628 error = SystemDictionary::find_resolution_error(this_oop, which); |
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629 assert(error != NULL, "checking"); |
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630 CLEAR_PENDING_EXCEPTION; |
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631 THROW_MSG(error, ""); |
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632 } |
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633 } |
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634 |
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635 |
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636 // Called to resolve constants in the constant pool and return an oop. |
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637 // Some constant pool entries cache their resolved oop. This is also |
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638 // called to create oops from constants to use in arguments for invokedynamic |
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639 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) { |
1602 | 640 oop result_oop = NULL; |
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641 Handle throw_exception; |
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642 |
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643 if (cache_index == _possible_index_sentinel) { |
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644 // It is possible that this constant is one which is cached in the objects. |
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645 // We'll do a linear search. This should be OK because this usage is rare. |
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646 assert(index > 0, "valid index"); |
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647 cache_index = this_oop->cp_to_object_index(index); |
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648 } |
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649 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); |
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650 assert(index == _no_index_sentinel || index >= 0, ""); |
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651 |
1602 | 652 if (cache_index >= 0) { |
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653 result_oop = this_oop->resolved_references()->obj_at(cache_index); |
1602 | 654 if (result_oop != NULL) { |
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655 return result_oop; |
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656 // That was easy... |
1602 | 657 } |
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658 index = this_oop->object_to_cp_index(cache_index); |
1602 | 659 } |
660 | |
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661 jvalue prim_value; // temp used only in a few cases below |
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662 |
1602 | 663 int tag_value = this_oop->tag_at(index).value(); |
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664 |
1602 | 665 switch (tag_value) { |
666 | |
667 case JVM_CONSTANT_UnresolvedClass: | |
668 case JVM_CONSTANT_UnresolvedClassInError: | |
669 case JVM_CONSTANT_Class: | |
670 { | |
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671 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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672 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL); |
1602 | 673 // ldc wants the java mirror. |
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674 result_oop = resolved->java_mirror(); |
1602 | 675 break; |
676 } | |
677 | |
678 case JVM_CONSTANT_String: | |
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679 assert(cache_index != _no_index_sentinel, "should have been set"); |
1602 | 680 if (this_oop->is_pseudo_string_at(index)) { |
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681 result_oop = this_oop->pseudo_string_at(index, cache_index); |
1602 | 682 break; |
683 } | |
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684 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL); |
1602 | 685 break; |
686 | |
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687 case JVM_CONSTANT_MethodHandleInError: |
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688 case JVM_CONSTANT_MethodTypeInError: |
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689 { |
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690 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index); |
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691 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); |
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692 ResourceMark rm; |
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693 THROW_MSG_0(error, ""); |
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694 break; |
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695 } |
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696 |
1602 | 697 case JVM_CONSTANT_MethodHandle: |
698 { | |
699 int ref_kind = this_oop->method_handle_ref_kind_at(index); | |
700 int callee_index = this_oop->method_handle_klass_index_at(index); | |
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701 Symbol* name = this_oop->method_handle_name_ref_at(index); |
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702 Symbol* signature = this_oop->method_handle_signature_ref_at(index); |
1602 | 703 if (PrintMiscellaneous) |
704 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", | |
705 ref_kind, index, this_oop->method_handle_index_at(index), | |
706 callee_index, name->as_C_string(), signature->as_C_string()); | |
707 KlassHandle callee; | |
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708 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL); |
1602 | 709 callee = KlassHandle(THREAD, k); |
710 } | |
711 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
712 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, | |
713 callee, name, signature, | |
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714 THREAD); |
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715 result_oop = value(); |
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716 if (HAS_PENDING_EXCEPTION) { |
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717 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); |
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718 } |
1602 | 719 break; |
720 } | |
721 | |
722 case JVM_CONSTANT_MethodType: | |
723 { | |
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724 Symbol* signature = this_oop->method_type_signature_at(index); |
1602 | 725 if (PrintMiscellaneous) |
726 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", | |
727 index, this_oop->method_type_index_at(index), | |
728 signature->as_C_string()); | |
729 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
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730 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); |
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731 result_oop = value(); |
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732 if (HAS_PENDING_EXCEPTION) { |
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733 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); |
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734 } |
1602 | 735 break; |
736 } | |
737 | |
738 case JVM_CONSTANT_Integer: | |
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739 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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740 prim_value.i = this_oop->int_at(index); |
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741 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); |
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742 break; |
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743 |
1602 | 744 case JVM_CONSTANT_Float: |
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745 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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746 prim_value.f = this_oop->float_at(index); |
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747 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); |
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748 break; |
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749 |
1602 | 750 case JVM_CONSTANT_Long: |
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751 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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752 prim_value.j = this_oop->long_at(index); |
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753 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); |
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754 break; |
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755 |
1602 | 756 case JVM_CONSTANT_Double: |
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757 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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758 prim_value.d = this_oop->double_at(index); |
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759 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); |
1602 | 760 break; |
761 | |
762 default: | |
763 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", | |
764 this_oop(), index, cache_index, tag_value) ); | |
765 assert(false, "unexpected constant tag"); | |
766 break; | |
767 } | |
768 | |
769 if (cache_index >= 0) { | |
770 // Cache the oop here also. | |
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771 Handle result_handle(THREAD, result_oop); |
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772 oop cplock = this_oop->lock(); |
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773 ObjectLocker ol(cplock, THREAD, cplock != NULL); // don't know if we really need this |
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774 oop result = this_oop->resolved_references()->obj_at(cache_index); |
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775 // Benign race condition: resolved_references may already be filled in while we were trying to lock. |
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776 // The important thing here is that all threads pick up the same result. |
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777 // It doesn't matter which racing thread wins, as long as only one |
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778 // result is used by all threads, and all future queries. |
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779 // That result may be either a resolved constant or a failure exception. |
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780 if (result == NULL) { |
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781 this_oop->resolved_references()->obj_at_put(cache_index, result_handle()); |
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782 return result_handle(); |
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783 } else { |
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784 // Return the winning thread's result. This can be different than |
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785 // result_handle() for MethodHandles. |
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786 return result; |
1602 | 787 } |
788 } else { | |
789 return result_oop; | |
790 } | |
791 } | |
792 | |
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793 oop ConstantPool::uncached_string_at(int which, TRAPS) { |
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794 Symbol* sym = unresolved_string_at(which); |
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795 oop str = StringTable::intern(sym, CHECK_(NULL)); |
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796 assert(java_lang_String::is_instance(str), "must be string"); |
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797 return str; |
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798 } |
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799 |
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800 |
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801 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) { |
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802 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); |
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803 |
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804 Handle bsm; |
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805 int argc; |
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806 { |
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807 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments |
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808 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. |
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809 // It is accompanied by the optional arguments. |
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810 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index); |
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811 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); |
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812 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { |
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813 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); |
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814 } |
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815 |
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|
816 // Extract the optional static arguments. |
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817 argc = this_oop->invoke_dynamic_argument_count_at(index); |
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818 if (argc == 0) return bsm_oop; |
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819 |
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820 bsm = Handle(THREAD, bsm_oop); |
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821 } |
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822 |
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823 objArrayHandle info; |
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824 { |
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825 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); |
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826 info = objArrayHandle(THREAD, info_oop); |
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827 } |
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828 |
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829 info->obj_at_put(0, bsm()); |
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830 for (int i = 0; i < argc; i++) { |
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831 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i); |
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832 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); |
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833 info->obj_at_put(1+i, arg_oop); |
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834 } |
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835 |
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836 return info(); |
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837 } |
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838 |
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839 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) { |
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840 // If the string has already been interned, this entry will be non-null |
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841 oop str = this_oop->resolved_references()->obj_at(obj_index); |
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842 if (str != NULL) return str; |
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843 |
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844 Symbol* sym = this_oop->unresolved_string_at(which); |
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845 str = StringTable::intern(sym, CHECK_(NULL)); |
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846 this_oop->string_at_put(which, obj_index, str); |
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847 assert(java_lang_String::is_instance(str), "must be string"); |
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848 return str; |
0 | 849 } |
850 | |
851 | |
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852 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, |
0 | 853 int which) { |
2177
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854 // Names are interned, so we can compare Symbol*s directly |
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855 Symbol* cp_name = klass_name_at(which); |
0 | 856 return (cp_name == k->name()); |
857 } | |
858 | |
859 | |
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860 // Iterate over symbols and decrement ones which are Symbol*s. |
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861 // This is done during GC so do not need to lock constantPool unless we |
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862 // have per-thread safepoints. |
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863 // Only decrement the UTF8 symbols. Unresolved classes and strings point to |
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864 // these symbols but didn't increment the reference count. |
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865 void ConstantPool::unreference_symbols() { |
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866 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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867 constantTag tag = tag_at(index); |
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868 if (tag.is_symbol()) { |
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869 symbol_at(index)->decrement_refcount(); |
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870 } |
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871 } |
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872 } |
0 | 873 |
874 | |
875 // Compare this constant pool's entry at index1 to the constant pool | |
876 // cp2's entry at index2. | |
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877 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2, |
0 | 878 int index2, TRAPS) { |
879 | |
880 jbyte t1 = tag_at(index1).value(); | |
881 jbyte t2 = cp2->tag_at(index2).value(); | |
882 | |
883 | |
884 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass | |
885 // when comparing | |
886 if (t1 == JVM_CONSTANT_UnresolvedClassInError) { | |
887 t1 = JVM_CONSTANT_UnresolvedClass; | |
888 } | |
889 if (t2 == JVM_CONSTANT_UnresolvedClassInError) { | |
890 t2 = JVM_CONSTANT_UnresolvedClass; | |
891 } | |
892 | |
893 if (t1 != t2) { | |
894 // Not the same entry type so there is nothing else to check. Note | |
895 // that this style of checking will consider resolved/unresolved | |
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896 // class pairs as different. |
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897 // From the ConstantPool* API point of view, this is correct |
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898 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this |
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899 // plays out in the context of ConstantPool* merging. |
0 | 900 return false; |
901 } | |
902 | |
903 switch (t1) { | |
904 case JVM_CONSTANT_Class: | |
905 { | |
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906 Klass* k1 = klass_at(index1, CHECK_false); |
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907 Klass* k2 = cp2->klass_at(index2, CHECK_false); |
0 | 908 if (k1 == k2) { |
909 return true; | |
910 } | |
911 } break; | |
912 | |
913 case JVM_CONSTANT_ClassIndex: | |
914 { | |
915 int recur1 = klass_index_at(index1); | |
916 int recur2 = cp2->klass_index_at(index2); | |
917 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
918 if (match) { | |
919 return true; | |
920 } | |
921 } break; | |
922 | |
923 case JVM_CONSTANT_Double: | |
924 { | |
925 jdouble d1 = double_at(index1); | |
926 jdouble d2 = cp2->double_at(index2); | |
927 if (d1 == d2) { | |
928 return true; | |
929 } | |
930 } break; | |
931 | |
932 case JVM_CONSTANT_Fieldref: | |
933 case JVM_CONSTANT_InterfaceMethodref: | |
934 case JVM_CONSTANT_Methodref: | |
935 { | |
936 int recur1 = uncached_klass_ref_index_at(index1); | |
937 int recur2 = cp2->uncached_klass_ref_index_at(index2); | |
938 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
939 if (match) { | |
940 recur1 = uncached_name_and_type_ref_index_at(index1); | |
941 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); | |
942 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
943 if (match) { | |
944 return true; | |
945 } | |
946 } | |
947 } break; | |
948 | |
949 case JVM_CONSTANT_Float: | |
950 { | |
951 jfloat f1 = float_at(index1); | |
952 jfloat f2 = cp2->float_at(index2); | |
953 if (f1 == f2) { | |
954 return true; | |
955 } | |
956 } break; | |
957 | |
958 case JVM_CONSTANT_Integer: | |
959 { | |
960 jint i1 = int_at(index1); | |
961 jint i2 = cp2->int_at(index2); | |
962 if (i1 == i2) { | |
963 return true; | |
964 } | |
965 } break; | |
966 | |
967 case JVM_CONSTANT_Long: | |
968 { | |
969 jlong l1 = long_at(index1); | |
970 jlong l2 = cp2->long_at(index2); | |
971 if (l1 == l2) { | |
972 return true; | |
973 } | |
974 } break; | |
975 | |
976 case JVM_CONSTANT_NameAndType: | |
977 { | |
978 int recur1 = name_ref_index_at(index1); | |
979 int recur2 = cp2->name_ref_index_at(index2); | |
980 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
981 if (match) { | |
982 recur1 = signature_ref_index_at(index1); | |
983 recur2 = cp2->signature_ref_index_at(index2); | |
984 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
985 if (match) { | |
986 return true; | |
987 } | |
988 } | |
989 } break; | |
990 | |
991 case JVM_CONSTANT_StringIndex: | |
992 { | |
993 int recur1 = string_index_at(index1); | |
994 int recur2 = cp2->string_index_at(index2); | |
995 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
996 if (match) { | |
997 return true; | |
998 } | |
999 } break; | |
1000 | |
1001 case JVM_CONSTANT_UnresolvedClass: | |
1002 { | |
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1003 Symbol* k1 = unresolved_klass_at(index1); |
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1004 Symbol* k2 = cp2->unresolved_klass_at(index2); |
0 | 1005 if (k1 == k2) { |
1006 return true; | |
1007 } | |
1008 } break; | |
1009 | |
1602 | 1010 case JVM_CONSTANT_MethodType: |
1011 { | |
1012 int k1 = method_type_index_at(index1); | |
1013 int k2 = cp2->method_type_index_at(index2); | |
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1014 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1015 if (match) { |
1602 | 1016 return true; |
1017 } | |
1018 } break; | |
1019 | |
1020 case JVM_CONSTANT_MethodHandle: | |
1021 { | |
1022 int k1 = method_handle_ref_kind_at(index1); | |
1023 int k2 = cp2->method_handle_ref_kind_at(index2); | |
1024 if (k1 == k2) { | |
1025 int i1 = method_handle_index_at(index1); | |
1026 int i2 = cp2->method_handle_index_at(index2); | |
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1027 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); |
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1028 if (match) { |
1602 | 1029 return true; |
1030 } | |
1031 } | |
1032 } break; | |
1033 | |
1660
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1034 case JVM_CONSTANT_InvokeDynamic: |
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1035 { |
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1036 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); |
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1037 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); |
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1038 int i1 = invoke_dynamic_bootstrap_specifier_index(index1); |
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1039 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); |
10350 | 1040 // separate statements and variables because CHECK_false is used |
1041 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); | |
1042 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); | |
1043 return (match_entry && match_operand); | |
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1044 } break; |
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1045 |
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1046 case JVM_CONSTANT_String: |
0 | 1047 { |
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1048 Symbol* s1 = unresolved_string_at(index1); |
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1049 Symbol* s2 = cp2->unresolved_string_at(index2); |
0 | 1050 if (s1 == s2) { |
1051 return true; | |
1052 } | |
1053 } break; | |
1054 | |
1055 case JVM_CONSTANT_Utf8: | |
1056 { | |
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1057 Symbol* s1 = symbol_at(index1); |
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1058 Symbol* s2 = cp2->symbol_at(index2); |
0 | 1059 if (s1 == s2) { |
1060 return true; | |
1061 } | |
1062 } break; | |
1063 | |
1064 // Invalid is used as the tag for the second constant pool entry | |
1065 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1066 // not be seen by itself. | |
1067 case JVM_CONSTANT_Invalid: // fall through | |
1068 | |
1069 default: | |
1070 ShouldNotReachHere(); | |
1071 break; | |
1072 } | |
1073 | |
1074 return false; | |
1075 } // end compare_entry_to() | |
1076 | |
1077 | |
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1078 // Resize the operands array with delta_len and delta_size. |
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1079 // Used in RedefineClasses for CP merge. |
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1080 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { |
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1081 int old_len = operand_array_length(operands()); |
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1082 int new_len = old_len + delta_len; |
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1083 int min_len = (delta_len > 0) ? old_len : new_len; |
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1084 |
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1085 int old_size = operands()->length(); |
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1086 int new_size = old_size + delta_size; |
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1087 int min_size = (delta_size > 0) ? old_size : new_size; |
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1088 |
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1089 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
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1090 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); |
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1091 |
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1092 // Set index in the resized array for existing elements only |
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1093 for (int idx = 0; idx < min_len; idx++) { |
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1094 int offset = operand_offset_at(idx); // offset in original array |
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1095 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array |
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1096 } |
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1097 // Copy the bootstrap specifiers only |
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1098 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), |
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1099 new_ops->adr_at(2*new_len), |
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1100 (min_size - 2*min_len) * sizeof(u2)); |
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1101 // Explicitly deallocate old operands array. |
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1102 // Note, it is not needed for 7u backport. |
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1103 if ( operands() != NULL) { // the safety check |
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1104 MetadataFactory::free_array<u2>(loader_data, operands()); |
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1105 } |
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1106 set_operands(new_ops); |
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1107 } // end resize_operands() |
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1108 |
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1109 |
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1110 // Extend the operands array with the length and size of the ext_cp operands. |
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1111 // Used in RedefineClasses for CP merge. |
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1112 void ConstantPool::extend_operands(constantPoolHandle ext_cp, TRAPS) { |
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1113 int delta_len = operand_array_length(ext_cp->operands()); |
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1114 if (delta_len == 0) { |
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1115 return; // nothing to do |
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1116 } |
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1117 int delta_size = ext_cp->operands()->length(); |
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1118 |
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1119 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); |
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1120 |
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1121 if (operand_array_length(operands()) == 0) { |
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1122 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
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1123 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); |
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1124 // The first element index defines the offset of second part |
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1125 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array |
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1126 set_operands(new_ops); |
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1127 } else { |
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1128 resize_operands(delta_len, delta_size, CHECK); |
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1129 } |
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1130 |
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1131 } // end extend_operands() |
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1132 |
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1133 |
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1134 // Shrink the operands array to a smaller array with new_len length. |
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1135 // Used in RedefineClasses for CP merge. |
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1136 void ConstantPool::shrink_operands(int new_len, TRAPS) { |
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1137 int old_len = operand_array_length(operands()); |
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1138 if (new_len == old_len) { |
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1139 return; // nothing to do |
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1140 } |
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1141 assert(new_len < old_len, "shrunken operands array must be smaller"); |
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1142 |
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1143 int free_base = operand_next_offset_at(new_len - 1); |
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1144 int delta_len = new_len - old_len; |
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1145 int delta_size = 2*delta_len + free_base - operands()->length(); |
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1146 |
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1147 resize_operands(delta_len, delta_size, CHECK); |
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1148 |
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1149 } // end shrink_operands() |
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1150 |
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1151 |
7952
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1152 void ConstantPool::copy_operands(constantPoolHandle from_cp, |
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1153 constantPoolHandle to_cp, |
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1154 TRAPS) { |
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1155 |
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1156 int from_oplen = operand_array_length(from_cp->operands()); |
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1157 int old_oplen = operand_array_length(to_cp->operands()); |
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1158 if (from_oplen != 0) { |
6934 | 1159 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); |
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1160 // append my operands to the target's operands array |
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1161 if (old_oplen == 0) { |
6934 | 1162 // Can't just reuse from_cp's operand list because of deallocation issues |
1163 int len = from_cp->operands()->length(); | |
1164 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); | |
1165 Copy::conjoint_memory_atomic( | |
1166 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); | |
1167 to_cp->set_operands(new_ops); | |
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1168 } else { |
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1169 int old_len = to_cp->operands()->length(); |
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1170 int from_len = from_cp->operands()->length(); |
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1171 int old_off = old_oplen * sizeof(u2); |
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1172 int from_off = from_oplen * sizeof(u2); |
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1173 // Use the metaspace for the destination constant pool |
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1174 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); |
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1175 int fillp = 0, len = 0; |
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1176 // first part of dest |
6725
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1177 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), |
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1178 new_operands->adr_at(fillp), |
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1179 (len = old_off) * sizeof(u2)); |
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1180 fillp += len; |
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1181 // first part of src |
7964
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1182 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), |
6725
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1183 new_operands->adr_at(fillp), |
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1184 (len = from_off) * sizeof(u2)); |
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1185 fillp += len; |
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1186 // second part of dest |
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1187 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), |
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1188 new_operands->adr_at(fillp), |
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1189 (len = old_len - old_off) * sizeof(u2)); |
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1190 fillp += len; |
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1191 // second part of src |
7964
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1192 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), |
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1193 new_operands->adr_at(fillp), |
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1194 (len = from_len - from_off) * sizeof(u2)); |
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1195 fillp += len; |
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1196 assert(fillp == new_operands->length(), ""); |
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1197 |
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1198 // Adjust indexes in the first part of the copied operands array. |
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1199 for (int j = 0; j < from_oplen; j++) { |
6725
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1200 int offset = operand_offset_at(new_operands, old_oplen + j); |
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1201 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); |
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1202 offset += old_len; // every new tuple is preceded by old_len extra u2's |
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1203 operand_offset_at_put(new_operands, old_oplen + j, offset); |
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1204 } |
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1205 |
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1206 // replace target operands array with combined array |
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1207 to_cp->set_operands(new_operands); |
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1208 } |
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1209 } |
7952
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1210 } // end copy_operands() |
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1211 |
7952
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1212 |
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1213 // Copy this constant pool's entries at start_i to end_i (inclusive) |
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1214 // to the constant pool to_cp's entries starting at to_i. A total of |
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1215 // (end_i - start_i) + 1 entries are copied. |
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1216 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, |
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1217 constantPoolHandle to_cp, int to_i, TRAPS) { |
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1218 |
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1219 |
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1220 int dest_i = to_i; // leave original alone for debug purposes |
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1221 |
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1222 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { |
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1223 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); |
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1224 |
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1225 switch (from_cp->tag_at(src_i).value()) { |
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1226 case JVM_CONSTANT_Double: |
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1227 case JVM_CONSTANT_Long: |
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1228 // double and long take two constant pool entries |
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1229 src_i += 2; |
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1230 dest_i += 2; |
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1231 break; |
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1232 |
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1233 default: |
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1234 // all others take one constant pool entry |
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1235 src_i++; |
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1236 dest_i++; |
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1237 break; |
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1238 } |
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1239 } |
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1240 copy_operands(from_cp, to_cp, CHECK); |
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1241 |
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1242 } // end copy_cp_to_impl() |
0 | 1243 |
1244 | |
1245 // Copy this constant pool's entry at from_i to the constant pool | |
1246 // to_cp's entry at to_i. | |
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1247 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i, |
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1248 constantPoolHandle to_cp, int to_i, |
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1249 TRAPS) { |
0 | 1250 |
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1251 int tag = from_cp->tag_at(from_i).value(); |
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1252 switch (tag) { |
0 | 1253 case JVM_CONSTANT_Class: |
1254 { | |
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1255 Klass* k = from_cp->klass_at(from_i, CHECK); |
0 | 1256 to_cp->klass_at_put(to_i, k); |
1257 } break; | |
1258 | |
1259 case JVM_CONSTANT_ClassIndex: | |
1260 { | |
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1261 jint ki = from_cp->klass_index_at(from_i); |
0 | 1262 to_cp->klass_index_at_put(to_i, ki); |
1263 } break; | |
1264 | |
1265 case JVM_CONSTANT_Double: | |
1266 { | |
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1267 jdouble d = from_cp->double_at(from_i); |
0 | 1268 to_cp->double_at_put(to_i, d); |
1269 // double takes two constant pool entries so init second entry's tag | |
1270 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1271 } break; | |
1272 | |
1273 case JVM_CONSTANT_Fieldref: | |
1274 { | |
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1275 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1276 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1277 to_cp->field_at_put(to_i, class_index, name_and_type_index); |
1278 } break; | |
1279 | |
1280 case JVM_CONSTANT_Float: | |
1281 { | |
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1282 jfloat f = from_cp->float_at(from_i); |
0 | 1283 to_cp->float_at_put(to_i, f); |
1284 } break; | |
1285 | |
1286 case JVM_CONSTANT_Integer: | |
1287 { | |
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1288 jint i = from_cp->int_at(from_i); |
0 | 1289 to_cp->int_at_put(to_i, i); |
1290 } break; | |
1291 | |
1292 case JVM_CONSTANT_InterfaceMethodref: | |
1293 { | |
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1294 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1295 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1296 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); |
1297 } break; | |
1298 | |
1299 case JVM_CONSTANT_Long: | |
1300 { | |
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1301 jlong l = from_cp->long_at(from_i); |
0 | 1302 to_cp->long_at_put(to_i, l); |
1303 // long takes two constant pool entries so init second entry's tag | |
1304 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1305 } break; | |
1306 | |
1307 case JVM_CONSTANT_Methodref: | |
1308 { | |
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1309 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1310 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1311 to_cp->method_at_put(to_i, class_index, name_and_type_index); |
1312 } break; | |
1313 | |
1314 case JVM_CONSTANT_NameAndType: | |
1315 { | |
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1316 int name_ref_index = from_cp->name_ref_index_at(from_i); |
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1317 int signature_ref_index = from_cp->signature_ref_index_at(from_i); |
0 | 1318 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); |
1319 } break; | |
1320 | |
1321 case JVM_CONSTANT_StringIndex: | |
1322 { | |
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1323 jint si = from_cp->string_index_at(from_i); |
0 | 1324 to_cp->string_index_at_put(to_i, si); |
1325 } break; | |
1326 | |
1327 case JVM_CONSTANT_UnresolvedClass: | |
1328 { | |
2332
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1329 // Can be resolved after checking tag, so check the slot first. |
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1330 CPSlot entry = from_cp->slot_at(from_i); |
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1331 if (entry.is_resolved()) { |
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1332 assert(entry.get_klass()->is_klass(), "must be"); |
2332
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1333 // Already resolved |
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1334 to_cp->klass_at_put(to_i, entry.get_klass()); |
2332
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1335 } else { |
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1336 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); |
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1337 } |
0 | 1338 } break; |
1339 | |
1340 case JVM_CONSTANT_UnresolvedClassInError: | |
1341 { | |
2177
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1342 Symbol* k = from_cp->unresolved_klass_at(from_i); |
0 | 1343 to_cp->unresolved_klass_at_put(to_i, k); |
1344 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError); | |
1345 } break; | |
1346 | |
1347 | |
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1348 case JVM_CONSTANT_String: |
0 | 1349 { |
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1350 Symbol* s = from_cp->unresolved_string_at(from_i); |
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1351 to_cp->unresolved_string_at_put(to_i, s); |
0 | 1352 } break; |
1353 | |
1354 case JVM_CONSTANT_Utf8: | |
1355 { | |
2177
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1356 Symbol* s = from_cp->symbol_at(from_i); |
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1357 // Need to increase refcount, the old one will be thrown away and deferenced |
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1358 s->increment_refcount(); |
0 | 1359 to_cp->symbol_at_put(to_i, s); |
1360 } break; | |
1361 | |
1602 | 1362 case JVM_CONSTANT_MethodType: |
1363 { | |
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1364 jint k = from_cp->method_type_index_at(from_i); |
1602 | 1365 to_cp->method_type_index_at_put(to_i, k); |
1366 } break; | |
1367 | |
1368 case JVM_CONSTANT_MethodHandle: | |
1369 { | |
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1370 int k1 = from_cp->method_handle_ref_kind_at(from_i); |
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1371 int k2 = from_cp->method_handle_index_at(from_i); |
1602 | 1372 to_cp->method_handle_index_at_put(to_i, k1, k2); |
1373 } break; | |
1374 | |
1660
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|
1375 case JVM_CONSTANT_InvokeDynamic: |
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|
1376 { |
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|
1377 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); |
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|
1378 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); |
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1379 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands |
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|
1380 to_cp->invoke_dynamic_at_put(to_i, k1, k2); |
1660
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|
1381 } break; |
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|
1382 |
0 | 1383 // Invalid is used as the tag for the second constant pool entry |
1384 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1385 // not be seen by itself. | |
1386 case JVM_CONSTANT_Invalid: // fall through | |
1387 | |
1388 default: | |
1389 { | |
1390 ShouldNotReachHere(); | |
1391 } break; | |
1392 } | |
1393 } // end copy_entry_to() | |
1394 | |
1395 | |
1396 // Search constant pool search_cp for an entry that matches this | |
1397 // constant pool's entry at pattern_i. Returns the index of a | |
1398 // matching entry or zero (0) if there is no matching entry. | |
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1399 int ConstantPool::find_matching_entry(int pattern_i, |
0 | 1400 constantPoolHandle search_cp, TRAPS) { |
1401 | |
1402 // index zero (0) is not used | |
1403 for (int i = 1; i < search_cp->length(); i++) { | |
1404 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); | |
1405 if (found) { | |
1406 return i; | |
1407 } | |
1408 } | |
1409 | |
1410 return 0; // entry not found; return unused index zero (0) | |
1411 } // end find_matching_entry() | |
1412 | |
1413 | |
10151
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1414 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool |
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1415 // cp2's bootstrap specifier at idx2. |
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1416 bool ConstantPool::compare_operand_to(int idx1, constantPoolHandle cp2, int idx2, TRAPS) { |
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1417 int k1 = operand_bootstrap_method_ref_index_at(idx1); |
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1418 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); |
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1419 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1420 |
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1421 if (!match) { |
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1422 return false; |
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1423 } |
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1424 int argc = operand_argument_count_at(idx1); |
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1425 if (argc == cp2->operand_argument_count_at(idx2)) { |
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1426 for (int j = 0; j < argc; j++) { |
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1427 k1 = operand_argument_index_at(idx1, j); |
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1428 k2 = cp2->operand_argument_index_at(idx2, j); |
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1429 match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1430 if (!match) { |
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1431 return false; |
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1432 } |
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1433 } |
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1434 return true; // got through loop; all elements equal |
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1435 } |
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1436 return false; |
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1437 } // end compare_operand_to() |
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1438 |
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1439 // Search constant pool search_cp for a bootstrap specifier that matches |
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1440 // this constant pool's bootstrap specifier at pattern_i index. |
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1441 // Return the index of a matching bootstrap specifier or (-1) if there is no match. |
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1442 int ConstantPool::find_matching_operand(int pattern_i, |
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1443 constantPoolHandle search_cp, int search_len, TRAPS) { |
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1444 for (int i = 0; i < search_len; i++) { |
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1445 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); |
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1446 if (found) { |
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1447 return i; |
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1448 } |
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1449 } |
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1450 return -1; // bootstrap specifier not found; return unused index (-1) |
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1451 } // end find_matching_operand() |
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1452 |
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1453 |
0 | 1454 #ifndef PRODUCT |
1455 | |
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1456 const char* ConstantPool::printable_name_at(int which) { |
0 | 1457 |
1458 constantTag tag = tag_at(which); | |
1459 | |
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1460 if (tag.is_string()) { |
0 | 1461 return string_at_noresolve(which); |
1462 } else if (tag.is_klass() || tag.is_unresolved_klass()) { | |
1463 return klass_name_at(which)->as_C_string(); | |
1464 } else if (tag.is_symbol()) { | |
1465 return symbol_at(which)->as_C_string(); | |
1466 } | |
1467 return ""; | |
1468 } | |
1469 | |
1470 #endif // PRODUCT | |
1471 | |
1472 | |
1473 // JVMTI GetConstantPool support | |
1474 | |
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1475 // For debugging of constant pool |
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1476 const bool debug_cpool = false; |
0 | 1477 |
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1478 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) |
0 | 1479 |
1480 static void print_cpool_bytes(jint cnt, u1 *bytes) { | |
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1481 const char* WARN_MSG = "Must not be such entry!"; |
0 | 1482 jint size = 0; |
1483 u2 idx1, idx2; | |
1484 | |
1485 for (jint idx = 1; idx < cnt; idx++) { | |
1486 jint ent_size = 0; | |
1487 u1 tag = *bytes++; | |
1488 size++; // count tag | |
1489 | |
1490 printf("const #%03d, tag: %02d ", idx, tag); | |
1491 switch(tag) { | |
1492 case JVM_CONSTANT_Invalid: { | |
1493 printf("Invalid"); | |
1494 break; | |
1495 } | |
1496 case JVM_CONSTANT_Unicode: { | |
1497 printf("Unicode %s", WARN_MSG); | |
1498 break; | |
1499 } | |
1500 case JVM_CONSTANT_Utf8: { | |
1501 u2 len = Bytes::get_Java_u2(bytes); | |
1502 char str[128]; | |
1503 if (len > 127) { | |
1504 len = 127; | |
1505 } | |
1506 strncpy(str, (char *) (bytes+2), len); | |
1507 str[len] = '\0'; | |
1508 printf("Utf8 \"%s\"", str); | |
1509 ent_size = 2 + len; | |
1510 break; | |
1511 } | |
1512 case JVM_CONSTANT_Integer: { | |
1513 u4 val = Bytes::get_Java_u4(bytes); | |
1514 printf("int %d", *(int *) &val); | |
1515 ent_size = 4; | |
1516 break; | |
1517 } | |
1518 case JVM_CONSTANT_Float: { | |
1519 u4 val = Bytes::get_Java_u4(bytes); | |
1520 printf("float %5.3ff", *(float *) &val); | |
1521 ent_size = 4; | |
1522 break; | |
1523 } | |
1524 case JVM_CONSTANT_Long: { | |
1525 u8 val = Bytes::get_Java_u8(bytes); | |
3960 | 1526 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val); |
0 | 1527 ent_size = 8; |
1528 idx++; // Long takes two cpool slots | |
1529 break; | |
1530 } | |
1531 case JVM_CONSTANT_Double: { | |
1532 u8 val = Bytes::get_Java_u8(bytes); | |
1533 printf("double %5.3fd", *(jdouble *)&val); | |
1534 ent_size = 8; | |
1535 idx++; // Double takes two cpool slots | |
1536 break; | |
1537 } | |
1538 case JVM_CONSTANT_Class: { | |
1539 idx1 = Bytes::get_Java_u2(bytes); | |
1540 printf("class #%03d", idx1); | |
1541 ent_size = 2; | |
1542 break; | |
1543 } | |
1544 case JVM_CONSTANT_String: { | |
1545 idx1 = Bytes::get_Java_u2(bytes); | |
1546 printf("String #%03d", idx1); | |
1547 ent_size = 2; | |
1548 break; | |
1549 } | |
1550 case JVM_CONSTANT_Fieldref: { | |
1551 idx1 = Bytes::get_Java_u2(bytes); | |
1552 idx2 = Bytes::get_Java_u2(bytes+2); | |
1553 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); | |
1554 ent_size = 4; | |
1555 break; | |
1556 } | |
1557 case JVM_CONSTANT_Methodref: { | |
1558 idx1 = Bytes::get_Java_u2(bytes); | |
1559 idx2 = Bytes::get_Java_u2(bytes+2); | |
1560 printf("Method #%03d, #%03d", idx1, idx2); | |
1561 ent_size = 4; | |
1562 break; | |
1563 } | |
1564 case JVM_CONSTANT_InterfaceMethodref: { | |
1565 idx1 = Bytes::get_Java_u2(bytes); | |
1566 idx2 = Bytes::get_Java_u2(bytes+2); | |
1567 printf("InterfMethod #%03d, #%03d", idx1, idx2); | |
1568 ent_size = 4; | |
1569 break; | |
1570 } | |
1571 case JVM_CONSTANT_NameAndType: { | |
1572 idx1 = Bytes::get_Java_u2(bytes); | |
1573 idx2 = Bytes::get_Java_u2(bytes+2); | |
1574 printf("NameAndType #%03d, #%03d", idx1, idx2); | |
1575 ent_size = 4; | |
1576 break; | |
1577 } | |
1578 case JVM_CONSTANT_ClassIndex: { | |
1579 printf("ClassIndex %s", WARN_MSG); | |
1580 break; | |
1581 } | |
1582 case JVM_CONSTANT_UnresolvedClass: { | |
1583 printf("UnresolvedClass: %s", WARN_MSG); | |
1584 break; | |
1585 } | |
1586 case JVM_CONSTANT_UnresolvedClassInError: { | |
1587 printf("UnresolvedClassInErr: %s", WARN_MSG); | |
1588 break; | |
1589 } | |
1590 case JVM_CONSTANT_StringIndex: { | |
1591 printf("StringIndex: %s", WARN_MSG); | |
1592 break; | |
1593 } | |
1594 } | |
1595 printf(";\n"); | |
1596 bytes += ent_size; | |
1597 size += ent_size; | |
1598 } | |
1599 printf("Cpool size: %d\n", size); | |
1600 fflush(0); | |
1601 return; | |
1602 } /* end print_cpool_bytes */ | |
1603 | |
1604 | |
1605 // Returns size of constant pool entry. | |
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1606 jint ConstantPool::cpool_entry_size(jint idx) { |
0 | 1607 switch(tag_at(idx).value()) { |
1608 case JVM_CONSTANT_Invalid: | |
1609 case JVM_CONSTANT_Unicode: | |
1610 return 1; | |
1611 | |
1612 case JVM_CONSTANT_Utf8: | |
1613 return 3 + symbol_at(idx)->utf8_length(); | |
1614 | |
1615 case JVM_CONSTANT_Class: | |
1616 case JVM_CONSTANT_String: | |
1617 case JVM_CONSTANT_ClassIndex: | |
1618 case JVM_CONSTANT_UnresolvedClass: | |
1619 case JVM_CONSTANT_UnresolvedClassInError: | |
1620 case JVM_CONSTANT_StringIndex: | |
1602 | 1621 case JVM_CONSTANT_MethodType: |
0 | 1622 return 3; |
1623 | |
1602 | 1624 case JVM_CONSTANT_MethodHandle: |
1625 return 4; //tag, ref_kind, ref_index | |
1626 | |
0 | 1627 case JVM_CONSTANT_Integer: |
1628 case JVM_CONSTANT_Float: | |
1629 case JVM_CONSTANT_Fieldref: | |
1630 case JVM_CONSTANT_Methodref: | |
1631 case JVM_CONSTANT_InterfaceMethodref: | |
1632 case JVM_CONSTANT_NameAndType: | |
1913
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1633 return 5; |
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1634 |
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1635 case JVM_CONSTANT_InvokeDynamic: |
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1636 // u1 tag, u2 bsm, u2 nt |
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1637 return 5; |
0 | 1638 |
1639 case JVM_CONSTANT_Long: | |
1640 case JVM_CONSTANT_Double: | |
1641 return 9; | |
1642 } | |
1643 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); | |
1644 return 1; | |
1645 } /* end cpool_entry_size */ | |
1646 | |
1647 | |
1648 // SymbolHashMap is used to find a constant pool index from a string. | |
1649 // This function fills in SymbolHashMaps, one for utf8s and one for | |
1650 // class names, returns size of the cpool raw bytes. | |
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1651 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, |
0 | 1652 SymbolHashMap *classmap) { |
1653 jint size = 0; | |
1654 | |
1655 for (u2 idx = 1; idx < length(); idx++) { | |
1656 u2 tag = tag_at(idx).value(); | |
1657 size += cpool_entry_size(idx); | |
1658 | |
1659 switch(tag) { | |
1660 case JVM_CONSTANT_Utf8: { | |
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1661 Symbol* sym = symbol_at(idx); |
0 | 1662 symmap->add_entry(sym, idx); |
1663 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); | |
1664 break; | |
1665 } | |
1666 case JVM_CONSTANT_Class: | |
1667 case JVM_CONSTANT_UnresolvedClass: | |
1668 case JVM_CONSTANT_UnresolvedClassInError: { | |
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1669 Symbol* sym = klass_name_at(idx); |
0 | 1670 classmap->add_entry(sym, idx); |
1671 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); | |
1672 break; | |
1673 } | |
1674 case JVM_CONSTANT_Long: | |
1675 case JVM_CONSTANT_Double: { | |
1676 idx++; // Both Long and Double take two cpool slots | |
1677 break; | |
1678 } | |
1679 } | |
1680 } | |
1681 return size; | |
1682 } /* end hash_utf8_entries_to */ | |
1683 | |
1684 | |
1685 // Copy cpool bytes. | |
1686 // Returns: | |
1687 // 0, in case of OutOfMemoryError | |
1688 // -1, in case of internal error | |
1689 // > 0, count of the raw cpool bytes that have been copied | |
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1690 int ConstantPool::copy_cpool_bytes(int cpool_size, |
0 | 1691 SymbolHashMap* tbl, |
1692 unsigned char *bytes) { | |
1693 u2 idx1, idx2; | |
1694 jint size = 0; | |
1695 jint cnt = length(); | |
1696 unsigned char *start_bytes = bytes; | |
1697 | |
1698 for (jint idx = 1; idx < cnt; idx++) { | |
1699 u1 tag = tag_at(idx).value(); | |
1700 jint ent_size = cpool_entry_size(idx); | |
1701 | |
1702 assert(size + ent_size <= cpool_size, "Size mismatch"); | |
1703 | |
1704 *bytes = tag; | |
1705 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); | |
1706 switch(tag) { | |
1707 case JVM_CONSTANT_Invalid: { | |
1708 DBG(printf("JVM_CONSTANT_Invalid")); | |
1709 break; | |
1710 } | |
1711 case JVM_CONSTANT_Unicode: { | |
1712 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); | |
1713 DBG(printf("JVM_CONSTANT_Unicode")); | |
1714 break; | |
1715 } | |
1716 case JVM_CONSTANT_Utf8: { | |
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1717 Symbol* sym = symbol_at(idx); |
0 | 1718 char* str = sym->as_utf8(); |
1719 // Warning! It's crashing on x86 with len = sym->utf8_length() | |
1720 int len = (int) strlen(str); | |
1721 Bytes::put_Java_u2((address) (bytes+1), (u2) len); | |
1722 for (int i = 0; i < len; i++) { | |
1723 bytes[3+i] = (u1) str[i]; | |
1724 } | |
1725 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); | |
1726 break; | |
1727 } | |
1728 case JVM_CONSTANT_Integer: { | |
1729 jint val = int_at(idx); | |
1730 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1731 break; | |
1732 } | |
1733 case JVM_CONSTANT_Float: { | |
1734 jfloat val = float_at(idx); | |
1735 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1736 break; | |
1737 } | |
1738 case JVM_CONSTANT_Long: { | |
1739 jlong val = long_at(idx); | |
1740 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1741 idx++; // Long takes two cpool slots | |
1742 break; | |
1743 } | |
1744 case JVM_CONSTANT_Double: { | |
1745 jdouble val = double_at(idx); | |
1746 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1747 idx++; // Double takes two cpool slots | |
1748 break; | |
1749 } | |
1750 case JVM_CONSTANT_Class: | |
1751 case JVM_CONSTANT_UnresolvedClass: | |
1752 case JVM_CONSTANT_UnresolvedClassInError: { | |
1753 *bytes = JVM_CONSTANT_Class; | |
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1754 Symbol* sym = klass_name_at(idx); |
0 | 1755 idx1 = tbl->symbol_to_value(sym); |
1756 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1757 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1758 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); | |
1759 break; | |
1760 } | |
1761 case JVM_CONSTANT_String: { | |
1762 *bytes = JVM_CONSTANT_String; | |
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1763 Symbol* sym = unresolved_string_at(idx); |
0 | 1764 idx1 = tbl->symbol_to_value(sym); |
1765 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1766 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
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1767 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); |
0 | 1768 break; |
1769 } | |
1770 case JVM_CONSTANT_Fieldref: | |
1771 case JVM_CONSTANT_Methodref: | |
1772 case JVM_CONSTANT_InterfaceMethodref: { | |
1773 idx1 = uncached_klass_ref_index_at(idx); | |
1774 idx2 = uncached_name_and_type_ref_index_at(idx); | |
1775 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1776 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1777 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); | |
1778 break; | |
1779 } | |
1780 case JVM_CONSTANT_NameAndType: { | |
1781 idx1 = name_ref_index_at(idx); | |
1782 idx2 = signature_ref_index_at(idx); | |
1783 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1784 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1785 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); | |
1786 break; | |
1787 } | |
1788 case JVM_CONSTANT_ClassIndex: { | |
1789 *bytes = JVM_CONSTANT_Class; | |
1790 idx1 = klass_index_at(idx); | |
1791 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1792 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); | |
1793 break; | |
1794 } | |
1795 case JVM_CONSTANT_StringIndex: { | |
1796 *bytes = JVM_CONSTANT_String; | |
1797 idx1 = string_index_at(idx); | |
1798 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1799 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); | |
1800 break; | |
1801 } | |
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1802 case JVM_CONSTANT_MethodHandle: |
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1803 case JVM_CONSTANT_MethodHandleInError: { |
1602 | 1804 *bytes = JVM_CONSTANT_MethodHandle; |
1805 int kind = method_handle_ref_kind_at(idx); | |
1806 idx1 = method_handle_index_at(idx); | |
1807 *(bytes+1) = (unsigned char) kind; | |
1808 Bytes::put_Java_u2((address) (bytes+2), idx1); | |
1809 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); | |
1810 break; | |
1811 } | |
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1812 case JVM_CONSTANT_MethodType: |
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1813 case JVM_CONSTANT_MethodTypeInError: { |
1602 | 1814 *bytes = JVM_CONSTANT_MethodType; |
1815 idx1 = method_type_index_at(idx); | |
1816 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1817 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); | |
1818 break; | |
1819 } | |
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1820 case JVM_CONSTANT_InvokeDynamic: { |
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1821 *bytes = tag; |
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1822 idx1 = extract_low_short_from_int(*int_at_addr(idx)); |
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1823 idx2 = extract_high_short_from_int(*int_at_addr(idx)); |
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1824 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); |
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1825 Bytes::put_Java_u2((address) (bytes+1), idx1); |
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1826 Bytes::put_Java_u2((address) (bytes+3), idx2); |
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1827 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); |
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1828 break; |
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1829 } |
0 | 1830 } |
1831 DBG(printf("\n")); | |
1832 bytes += ent_size; | |
1833 size += ent_size; | |
1834 } | |
1835 assert(size == cpool_size, "Size mismatch"); | |
1836 | |
1837 // Keep temorarily for debugging until it's stable. | |
1838 DBG(print_cpool_bytes(cnt, start_bytes)); | |
1839 return (int)(bytes - start_bytes); | |
1840 } /* end copy_cpool_bytes */ | |
1841 | |
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1842 #undef DBG |
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1843 |
0 | 1844 |
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1845 void ConstantPool::set_on_stack(const bool value) { |
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1846 if (value) { |
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1847 _flags |= _on_stack; |
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1848 } else { |
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1849 _flags &= ~_on_stack; |
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1850 } |
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1851 if (value) MetadataOnStackMark::record(this); |
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1852 } |
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1853 |
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1854 // JSR 292 support for patching constant pool oops after the class is linked and |
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1855 // the oop array for resolved references are created. |
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1856 // We can't do this during classfile parsing, which is how the other indexes are |
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1857 // patched. The other patches are applied early for some error checking |
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1858 // so only defer the pseudo_strings. |
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1859 void ConstantPool::patch_resolved_references( |
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1860 GrowableArray<Handle>* cp_patches) { |
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1861 assert(EnableInvokeDynamic, ""); |
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1862 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused |
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1863 Handle patch = cp_patches->at(index); |
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1864 if (patch.not_null()) { |
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1865 assert (tag_at(index).is_string(), "should only be string left"); |
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1866 // Patching a string means pre-resolving it. |
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1867 // The spelling in the constant pool is ignored. |
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1868 // The constant reference may be any object whatever. |
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1869 // If it is not a real interned string, the constant is referred |
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1870 // to as a "pseudo-string", and must be presented to the CP |
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1871 // explicitly, because it may require scavenging. |
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1872 int obj_index = cp_to_object_index(index); |
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1873 pseudo_string_at_put(index, obj_index, patch()); |
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1874 DEBUG_ONLY(cp_patches->at_put(index, Handle());) |
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1875 } |
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1876 } |
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1877 #ifdef ASSERT |
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1878 // Ensure that all the patches have been used. |
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1879 for (int index = 0; index < cp_patches->length(); index++) { |
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1880 assert(cp_patches->at(index).is_null(), |
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1881 err_msg("Unused constant pool patch at %d in class file %s", |
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1882 index, |
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1883 pool_holder()->external_name())); |
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1884 } |
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1885 #endif // ASSERT |
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1886 } |
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1887 |
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1888 #ifndef PRODUCT |
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1889 |
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1890 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool |
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1891 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { |
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1892 guarantee(obj->is_constantPool(), "object must be constant pool"); |
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1893 constantPoolHandle cp(THREAD, (ConstantPool*)obj); |
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1894 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); |
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1895 |
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1896 for (int i = 0; i< cp->length(); i++) { |
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1897 if (cp->tag_at(i).is_unresolved_klass()) { |
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1898 // This will force loading of the class |
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1899 Klass* klass = cp->klass_at(i, CHECK); |
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1900 if (klass->oop_is_instance()) { |
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1901 // Force initialization of class |
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1902 InstanceKlass::cast(klass)->initialize(CHECK); |
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1903 } |
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1904 } |
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1905 } |
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1906 } |
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1907 |
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1908 #endif |
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1909 |
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1910 |
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1911 // Printing |
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1912 |
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1913 void ConstantPool::print_on(outputStream* st) const { |
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1914 EXCEPTION_MARK; |
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1915 assert(is_constantPool(), "must be constantPool"); |
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1916 st->print_cr(internal_name()); |
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1917 if (flags() != 0) { |
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1918 st->print(" - flags: 0x%x", flags()); |
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1919 if (has_preresolution()) st->print(" has_preresolution"); |
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1920 if (on_stack()) st->print(" on_stack"); |
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1921 st->cr(); |
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1922 } |
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1923 if (pool_holder() != NULL) { |
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1924 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder()); |
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1925 } |
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1926 st->print_cr(" - cache: " INTPTR_FORMAT, cache()); |
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1927 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references()); |
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1928 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map()); |
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1929 |
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1930 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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1931 ((ConstantPool*)this)->print_entry_on(index, st); |
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1932 switch (tag_at(index).value()) { |
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1933 case JVM_CONSTANT_Long : |
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1934 case JVM_CONSTANT_Double : |
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1935 index++; // Skip entry following eigth-byte constant |
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1936 } |
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1937 |
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1938 } |
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1939 st->cr(); |
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1940 } |
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1941 |
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1942 // Print one constant pool entry |
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1943 void ConstantPool::print_entry_on(const int index, outputStream* st) { |
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1944 EXCEPTION_MARK; |
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1945 st->print(" - %3d : ", index); |
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1946 tag_at(index).print_on(st); |
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1947 st->print(" : "); |
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1948 switch (tag_at(index).value()) { |
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1949 case JVM_CONSTANT_Class : |
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1950 { Klass* k = klass_at(index, CATCH); |
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1951 guarantee(k != NULL, "need klass"); |
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1952 k->print_value_on(st); |
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1953 st->print(" {0x%lx}", (address)k); |
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1954 } |
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1955 break; |
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1956 case JVM_CONSTANT_Fieldref : |
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1957 case JVM_CONSTANT_Methodref : |
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1958 case JVM_CONSTANT_InterfaceMethodref : |
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1959 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); |
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1960 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); |
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1961 break; |
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1962 case JVM_CONSTANT_String : |
8104 | 1963 if (is_pseudo_string_at(index)) { |
1964 oop anObj = pseudo_string_at(index); | |
1965 anObj->print_value_on(st); | |
1966 st->print(" {0x%lx}", (address)anObj); | |
1967 } else { | |
1968 unresolved_string_at(index)->print_value_on(st); | |
1969 } | |
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1970 break; |
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1971 case JVM_CONSTANT_Integer : |
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1972 st->print("%d", int_at(index)); |
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1973 break; |
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1974 case JVM_CONSTANT_Float : |
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1975 st->print("%f", float_at(index)); |
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1976 break; |
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1977 case JVM_CONSTANT_Long : |
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1978 st->print_jlong(long_at(index)); |
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1979 break; |
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1980 case JVM_CONSTANT_Double : |
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1981 st->print("%lf", double_at(index)); |
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1982 break; |
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1983 case JVM_CONSTANT_NameAndType : |
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1984 st->print("name_index=%d", name_ref_index_at(index)); |
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1985 st->print(" signature_index=%d", signature_ref_index_at(index)); |
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1986 break; |
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1987 case JVM_CONSTANT_Utf8 : |
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1988 symbol_at(index)->print_value_on(st); |
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1989 break; |
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1990 case JVM_CONSTANT_UnresolvedClass : // fall-through |
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1991 case JVM_CONSTANT_UnresolvedClassInError: { |
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1992 // unresolved_klass_at requires lock or safe world. |
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1993 CPSlot entry = slot_at(index); |
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1994 if (entry.is_resolved()) { |
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1995 entry.get_klass()->print_value_on(st); |
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1996 } else { |
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1997 entry.get_symbol()->print_value_on(st); |
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1998 } |
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1999 } |
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2000 break; |
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2001 case JVM_CONSTANT_MethodHandle : |
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2002 case JVM_CONSTANT_MethodHandleInError : |
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2003 st->print("ref_kind=%d", method_handle_ref_kind_at(index)); |
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2004 st->print(" ref_index=%d", method_handle_index_at(index)); |
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2005 break; |
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2006 case JVM_CONSTANT_MethodType : |
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2007 case JVM_CONSTANT_MethodTypeInError : |
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2008 st->print("signature_index=%d", method_type_index_at(index)); |
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2009 break; |
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2010 case JVM_CONSTANT_InvokeDynamic : |
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2011 { |
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2012 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); |
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2013 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); |
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2014 int argc = invoke_dynamic_argument_count_at(index); |
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2015 if (argc > 0) { |
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2016 for (int arg_i = 0; arg_i < argc; arg_i++) { |
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2017 int arg = invoke_dynamic_argument_index_at(index, arg_i); |
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2018 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); |
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2019 } |
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2020 st->print("}"); |
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2021 } |
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2022 } |
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2023 break; |
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2024 default: |
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2025 ShouldNotReachHere(); |
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2026 break; |
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2027 } |
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2028 st->cr(); |
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2029 } |
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2030 |
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2031 void ConstantPool::print_value_on(outputStream* st) const { |
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2032 assert(is_constantPool(), "must be constantPool"); |
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2033 st->print("constant pool [%d]", length()); |
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2034 if (has_preresolution()) st->print("/preresolution"); |
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2035 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); |
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2036 print_address_on(st); |
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2037 st->print(" for "); |
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2038 pool_holder()->print_value_on(st); |
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2039 if (pool_holder() != NULL) { |
6940
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2040 bool extra = (pool_holder()->constants() != this); |
6725
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2041 if (extra) st->print(" (extra)"); |
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2042 } |
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2043 if (cache() != NULL) { |
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2044 st->print(" cache=" PTR_FORMAT, cache()); |
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2045 } |
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2046 } |
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2047 |
7956 | 2048 #if INCLUDE_SERVICES |
2049 // Size Statistics | |
2050 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { | |
2051 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); | |
2052 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); | |
2053 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); | |
2054 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); | |
2055 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); | |
2056 | |
2057 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + | |
2058 sz->_cp_refmap_bytes; | |
2059 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; | |
2060 } | |
2061 #endif // INCLUDE_SERVICES | |
6725
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2062 |
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2063 // Verification |
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2064 |
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2065 void ConstantPool::verify_on(outputStream* st) { |
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2066 guarantee(is_constantPool(), "object must be constant pool"); |
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2067 for (int i = 0; i< length(); i++) { |
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2068 constantTag tag = tag_at(i); |
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2069 CPSlot entry = slot_at(i); |
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2070 if (tag.is_klass()) { |
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2071 if (entry.is_resolved()) { |
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2072 guarantee(entry.get_klass()->is_klass(), "should be klass"); |
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2073 } |
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2074 } else if (tag.is_unresolved_klass()) { |
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2075 if (entry.is_resolved()) { |
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2076 guarantee(entry.get_klass()->is_klass(), "should be klass"); |
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2077 } |
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2078 } else if (tag.is_symbol()) { |
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2079 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
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2080 } else if (tag.is_string()) { |
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2081 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
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2082 } |
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2083 } |
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2084 if (cache() != NULL) { |
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2085 // Note: cache() can be NULL before a class is completely setup or |
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2086 // in temporary constant pools used during constant pool merging |
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2087 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); |
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2088 } |
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2089 if (pool_holder() != NULL) { |
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2090 // Note: pool_holder() can be NULL in temporary constant pools |
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2091 // used during constant pool merging |
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2092 guarantee(pool_holder()->is_klass(), "should be klass"); |
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2093 } |
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2094 } |
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2095 |
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2096 |
2177
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2097 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { |
0 | 2098 char *str = sym->as_utf8(); |
2099 unsigned int hash = compute_hash(str, sym->utf8_length()); | |
2100 unsigned int index = hash % table_size(); | |
2101 | |
2102 // check if already in map | |
2103 // we prefer the first entry since it is more likely to be what was used in | |
2104 // the class file | |
2105 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2106 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2107 if (en->hash() == hash && en->symbol() == sym) { | |
2108 return; // already there | |
2109 } | |
2110 } | |
2111 | |
2112 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); | |
2113 entry->set_next(bucket(index)); | |
2114 _buckets[index].set_entry(entry); | |
2115 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2116 } | |
2117 | |
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2118 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { |
0 | 2119 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); |
2120 char *str = sym->as_utf8(); | |
2121 int len = sym->utf8_length(); | |
2122 unsigned int hash = SymbolHashMap::compute_hash(str, len); | |
2123 unsigned int index = hash % table_size(); | |
2124 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2125 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2126 if (en->hash() == hash && en->symbol() == sym) { | |
2127 return en; | |
2128 } | |
2129 } | |
2130 return NULL; | |
2131 } |