Mercurial > hg > graal-compiler
annotate src/share/vm/oops/constantPool.cpp @ 21814:5f07d936a14e
8058982: Better verification of an exceptional invokespecial
Summary: Throw VerifyError for illegal accesses
Reviewed-by: acorn, ahgross, coleenp
author | hseigel |
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date | Mon, 20 Oct 2014 15:14:56 -0400 |
parents | 78bbf4d43a14 |
children | 52b4284cb496 b12a2a9b05ca |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
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26 #include "classfile/classLoaderData.hpp" |
1972 | 27 #include "classfile/javaClasses.hpp" |
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28 #include "classfile/metadataOnStackMark.hpp" |
1972 | 29 #include "classfile/symbolTable.hpp" |
30 #include "classfile/systemDictionary.hpp" | |
31 #include "classfile/vmSymbols.hpp" | |
32 #include "interpreter/linkResolver.hpp" | |
7956 | 33 #include "memory/heapInspection.hpp" |
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34 #include "memory/metadataFactory.hpp" |
1972 | 35 #include "memory/oopFactory.hpp" |
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36 #include "oops/constantPool.hpp" |
1972 | 37 #include "oops/instanceKlass.hpp" |
38 #include "oops/objArrayKlass.hpp" | |
39 #include "runtime/fieldType.hpp" | |
40 #include "runtime/init.hpp" | |
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41 #include "runtime/javaCalls.hpp" |
1972 | 42 #include "runtime/signature.hpp" |
43 #include "runtime/vframe.hpp" | |
0 | 44 |
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45 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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46 |
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47 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { |
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48 // Tags are RW but comment below applies to tags also. |
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49 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); |
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50 |
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51 int size = ConstantPool::size(length); |
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52 |
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53 // CDS considerations: |
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54 // Allocate read-write but may be able to move to read-only at dumping time |
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55 // if all the klasses are resolved. The only other field that is writable is |
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56 // the resolved_references array, which is recreated at startup time. |
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57 // But that could be moved to InstanceKlass (although a pain to access from |
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58 // assembly code). Maybe it could be moved to the cpCache which is RW. |
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59 return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); |
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60 } |
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61 |
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62 ConstantPool::ConstantPool(Array<u1>* tags) { |
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63 set_length(tags->length()); |
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64 set_tags(NULL); |
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65 set_cache(NULL); |
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66 set_reference_map(NULL); |
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67 set_resolved_references(NULL); |
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68 set_operands(NULL); |
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69 set_pool_holder(NULL); |
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70 set_flags(0); |
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71 |
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72 // only set to non-zero if constant pool is merged by RedefineClasses |
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73 set_version(0); |
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74 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock")); |
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75 |
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76 // initialize tag array |
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77 int length = tags->length(); |
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78 for (int index = 0; index < length; index++) { |
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79 tags->at_put(index, JVM_CONSTANT_Invalid); |
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80 } |
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81 set_tags(tags); |
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82 } |
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83 |
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84 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { |
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85 MetadataFactory::free_metadata(loader_data, cache()); |
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86 set_cache(NULL); |
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87 MetadataFactory::free_array<u2>(loader_data, reference_map()); |
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88 set_reference_map(NULL); |
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89 |
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90 MetadataFactory::free_array<jushort>(loader_data, operands()); |
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91 set_operands(NULL); |
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92 |
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93 release_C_heap_structures(); |
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94 |
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95 // free tag array |
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96 MetadataFactory::free_array<u1>(loader_data, tags()); |
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97 set_tags(NULL); |
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98 } |
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99 |
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100 void ConstantPool::release_C_heap_structures() { |
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101 // walk constant pool and decrement symbol reference counts |
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102 unreference_symbols(); |
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103 |
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104 delete _lock; |
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105 set_lock(NULL); |
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106 } |
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107 |
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108 objArrayOop ConstantPool::resolved_references() const { |
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109 return (objArrayOop)JNIHandles::resolve(_resolved_references); |
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110 } |
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111 |
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112 // Create resolved_references array and mapping array for original cp indexes |
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113 // The ldc bytecode was rewritten to have the resolved reference array index so need a way |
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114 // to map it back for resolving and some unlikely miscellaneous uses. |
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115 // The objects created by invokedynamic are appended to this list. |
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116 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, |
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117 intStack reference_map, |
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118 int constant_pool_map_length, |
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119 TRAPS) { |
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120 // Initialized the resolved object cache. |
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121 int map_length = reference_map.length(); |
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122 if (map_length > 0) { |
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123 // Only need mapping back to constant pool entries. The map isn't used for |
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124 // invokedynamic resolved_reference entries. For invokedynamic entries, |
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125 // the constant pool cache index has the mapping back to both the constant |
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126 // pool and to the resolved reference index. |
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127 if (constant_pool_map_length > 0) { |
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128 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK); |
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129 |
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130 for (int i = 0; i < constant_pool_map_length; i++) { |
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131 int x = reference_map.at(i); |
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132 assert(x == (int)(jushort) x, "klass index is too big"); |
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133 om->at_put(i, (jushort)x); |
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134 } |
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135 set_reference_map(om); |
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136 } |
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137 |
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138 // Create Java array for holding resolved strings, methodHandles, |
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139 // methodTypes, invokedynamic and invokehandle appendix objects, etc. |
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140 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); |
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141 Handle refs_handle (THREAD, (oop)stom); // must handleize. |
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142 set_resolved_references(loader_data->add_handle(refs_handle)); |
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143 } |
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144 } |
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145 |
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146 // CDS support. Create a new resolved_references array. |
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147 void ConstantPool::restore_unshareable_info(TRAPS) { |
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148 |
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149 // Only create the new resolved references array and lock if it hasn't been |
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150 // attempted before |
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151 if (resolved_references() != NULL) return; |
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152 |
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153 // restore the C++ vtable from the shared archive |
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154 restore_vtable(); |
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155 |
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156 if (SystemDictionary::Object_klass_loaded()) { |
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157 // Recreate the object array and add to ClassLoaderData. |
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158 int map_length = resolved_reference_length(); |
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159 if (map_length > 0) { |
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160 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); |
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161 Handle refs_handle (THREAD, (oop)stom); // must handleize. |
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162 |
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163 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
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164 set_resolved_references(loader_data->add_handle(refs_handle)); |
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165 } |
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166 |
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167 // Also need to recreate the mutex. Make sure this matches the constructor |
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168 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock")); |
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169 } |
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170 } |
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171 |
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172 void ConstantPool::remove_unshareable_info() { |
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173 // Resolved references are not in the shared archive. |
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174 // Save the length for restoration. It is not necessarily the same length |
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175 // as reference_map.length() if invokedynamic is saved. |
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176 set_resolved_reference_length( |
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177 resolved_references() != NULL ? resolved_references()->length() : 0); |
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178 set_resolved_references(NULL); |
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179 set_lock(NULL); |
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180 } |
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181 |
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182 int ConstantPool::cp_to_object_index(int cp_index) { |
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183 // this is harder don't do this so much. |
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184 int i = reference_map()->find(cp_index); |
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185 // We might not find the index for jsr292 call. |
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186 return (i < 0) ? _no_index_sentinel : i; |
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187 } |
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188 |
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189 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) { |
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190 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
0 | 191 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and |
192 // tag is not updated atomicly. | |
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193 |
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194 CPSlot entry = this_oop->slot_at(which); |
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195 if (entry.is_resolved()) { |
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196 assert(entry.get_klass()->is_klass(), "must be"); |
0 | 197 // Already resolved - return entry. |
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198 return entry.get_klass(); |
0 | 199 } |
200 | |
201 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object | |
202 // already has updated the object | |
203 assert(THREAD->is_Java_thread(), "must be a Java thread"); | |
204 bool do_resolve = false; | |
205 bool in_error = false; | |
206 | |
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207 // Create a handle for the mirror. This will preserve the resolved class |
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208 // until the loader_data is registered. |
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209 Handle mirror_handle; |
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210 |
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211 Symbol* name = NULL; |
0 | 212 Handle loader; |
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213 { MonitorLockerEx ml(this_oop->lock()); |
0 | 214 |
215 if (this_oop->tag_at(which).is_unresolved_klass()) { | |
216 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
217 in_error = true; | |
218 } else { | |
219 do_resolve = true; | |
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220 name = this_oop->unresolved_klass_at(which); |
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221 loader = Handle(THREAD, this_oop->pool_holder()->class_loader()); |
0 | 222 } |
223 } | |
224 } // unlocking constantPool | |
225 | |
226 | |
227 // The original attempt to resolve this constant pool entry failed so find the | |
228 // original error and throw it again (JVMS 5.4.3). | |
229 if (in_error) { | |
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230 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which); |
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231 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); |
0 | 232 ResourceMark rm; |
233 // exception text will be the class name | |
234 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
235 THROW_MSG_0(error, className); | |
236 } | |
237 | |
238 if (do_resolve) { | |
239 // this_oop must be unlocked during resolve_or_fail | |
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240 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 241 Handle h_prot (THREAD, protection_domain); |
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242 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD); |
0 | 243 KlassHandle k; |
244 if (!HAS_PENDING_EXCEPTION) { | |
245 k = KlassHandle(THREAD, k_oop); | |
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246 // preserve the resolved klass. |
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247 mirror_handle = Handle(THREAD, k_oop->java_mirror()); |
0 | 248 // Do access check for klasses |
249 verify_constant_pool_resolve(this_oop, k, THREAD); | |
250 } | |
251 | |
252 // Failed to resolve class. We must record the errors so that subsequent attempts | |
253 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). | |
254 if (HAS_PENDING_EXCEPTION) { | |
255 ResourceMark rm; | |
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256 Symbol* error = PENDING_EXCEPTION->klass()->name(); |
0 | 257 |
258 bool throw_orig_error = false; | |
259 { | |
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260 MonitorLockerEx ml(this_oop->lock()); |
0 | 261 |
262 // some other thread has beaten us and has resolved the class. | |
263 if (this_oop->tag_at(which).is_klass()) { | |
264 CLEAR_PENDING_EXCEPTION; | |
265 entry = this_oop->resolved_klass_at(which); | |
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266 return entry.get_klass(); |
0 | 267 } |
268 | |
269 if (!PENDING_EXCEPTION-> | |
1142 | 270 is_a(SystemDictionary::LinkageError_klass())) { |
0 | 271 // Just throw the exception and don't prevent these classes from |
272 // being loaded due to virtual machine errors like StackOverflow | |
273 // and OutOfMemoryError, etc, or if the thread was hit by stop() | |
274 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) | |
275 } | |
276 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
277 SystemDictionary::add_resolution_error(this_oop, which, error); | |
278 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError); | |
279 } else { | |
280 // some other thread has put the class in error state. | |
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281 error = SystemDictionary::find_resolution_error(this_oop, which); |
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282 assert(error != NULL, "checking"); |
0 | 283 throw_orig_error = true; |
284 } | |
285 } // unlocked | |
286 | |
287 if (throw_orig_error) { | |
288 CLEAR_PENDING_EXCEPTION; | |
289 ResourceMark rm; | |
290 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
291 THROW_MSG_0(error, className); | |
292 } | |
293 | |
294 return 0; | |
295 } | |
296 | |
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297 if (TraceClassResolution && !k()->oop_is_array()) { |
0 | 298 // skip resolving the constant pool so that this code get's |
299 // called the next time some bytecodes refer to this class. | |
300 ResourceMark rm; | |
301 int line_number = -1; | |
302 const char * source_file = NULL; | |
303 if (JavaThread::current()->has_last_Java_frame()) { | |
304 // try to identify the method which called this function. | |
305 vframeStream vfst(JavaThread::current()); | |
306 if (!vfst.at_end()) { | |
307 line_number = vfst.method()->line_number_from_bci(vfst.bci()); | |
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308 Symbol* s = vfst.method()->method_holder()->source_file_name(); |
0 | 309 if (s != NULL) { |
310 source_file = s->as_C_string(); | |
311 } | |
312 } | |
313 } | |
314 if (k() != this_oop->pool_holder()) { | |
315 // only print something if the classes are different | |
316 if (source_file != NULL) { | |
317 tty->print("RESOLVE %s %s %s:%d\n", | |
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318 this_oop->pool_holder()->external_name(), |
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319 InstanceKlass::cast(k())->external_name(), source_file, line_number); |
0 | 320 } else { |
321 tty->print("RESOLVE %s %s\n", | |
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322 this_oop->pool_holder()->external_name(), |
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323 InstanceKlass::cast(k())->external_name()); |
0 | 324 } |
325 } | |
326 return k(); | |
327 } else { | |
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328 MonitorLockerEx ml(this_oop->lock()); |
0 | 329 // Only updated constant pool - if it is resolved. |
330 do_resolve = this_oop->tag_at(which).is_unresolved_klass(); | |
331 if (do_resolve) { | |
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332 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data(); |
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333 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM |
0 | 334 this_oop->klass_at_put(which, k()); |
335 } | |
336 } | |
337 } | |
338 | |
339 entry = this_oop->resolved_klass_at(which); | |
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340 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); |
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341 return entry.get_klass(); |
0 | 342 } |
343 | |
344 | |
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345 // Does not update ConstantPool* - to avoid any exception throwing. Used |
0 | 346 // by compiler and exception handling. Also used to avoid classloads for |
347 // instanceof operations. Returns NULL if the class has not been loaded or | |
348 // if the verification of constant pool failed | |
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349 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) { |
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350 CPSlot entry = this_oop->slot_at(which); |
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351 if (entry.is_resolved()) { |
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352 assert(entry.get_klass()->is_klass(), "must be"); |
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353 return entry.get_klass(); |
0 | 354 } else { |
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355 assert(entry.is_unresolved(), "must be either symbol or klass"); |
0 | 356 Thread *thread = Thread::current(); |
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357 Symbol* name = entry.get_symbol(); |
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358 oop loader = this_oop->pool_holder()->class_loader(); |
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359 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 360 Handle h_prot (thread, protection_domain); |
361 Handle h_loader (thread, loader); | |
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362 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); |
0 | 363 |
364 if (k != NULL) { | |
365 // Make sure that resolving is legal | |
366 EXCEPTION_MARK; | |
367 KlassHandle klass(THREAD, k); | |
368 // return NULL if verification fails | |
369 verify_constant_pool_resolve(this_oop, klass, THREAD); | |
370 if (HAS_PENDING_EXCEPTION) { | |
371 CLEAR_PENDING_EXCEPTION; | |
372 return NULL; | |
373 } | |
374 return klass(); | |
375 } else { | |
376 return k; | |
377 } | |
378 } | |
379 } | |
380 | |
381 | |
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382 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) { |
0 | 383 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which)); |
384 } | |
385 | |
386 | |
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387 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool, |
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388 int which) { |
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389 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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390 int cache_index = decode_cpcache_index(which, true); |
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391 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { |
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392 // FIXME: should be an assert |
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393 if (PrintMiscellaneous && (Verbose||WizardMode)) { |
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394 tty->print_cr("bad operand %d in:", which); cpool->print(); |
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395 } |
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396 return NULL; |
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397 } |
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398 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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399 return e->method_if_resolved(cpool); |
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400 } |
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401 |
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402 |
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403 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) { |
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404 if (cpool->cache() == NULL) return false; // nothing to load yet |
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405 int cache_index = decode_cpcache_index(which, true); |
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406 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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407 return e->has_appendix(); |
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408 } |
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409 |
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410 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) { |
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411 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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412 int cache_index = decode_cpcache_index(which, true); |
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413 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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414 return e->appendix_if_resolved(cpool); |
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415 } |
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416 |
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417 |
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418 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) { |
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419 if (cpool->cache() == NULL) return false; // nothing to load yet |
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420 int cache_index = decode_cpcache_index(which, true); |
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421 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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422 return e->has_method_type(); |
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423 } |
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424 |
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425 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) { |
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426 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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427 int cache_index = decode_cpcache_index(which, true); |
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428 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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429 return e->method_type_if_resolved(cpool); |
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430 } |
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431 |
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432 |
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433 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { |
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434 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
0 | 435 return symbol_at(name_index); |
436 } | |
437 | |
438 | |
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439 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { |
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440 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
0 | 441 return symbol_at(signature_index); |
442 } | |
443 | |
444 | |
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445 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { |
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446 int i = which; |
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447 if (!uncached && cache() != NULL) { |
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448 if (ConstantPool::is_invokedynamic_index(which)) { |
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449 // Invokedynamic index is index into resolved_references |
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450 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); |
2460 | 451 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); |
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452 assert(tag_at(pool_index).is_name_and_type(), ""); |
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453 return pool_index; |
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454 } |
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455 // change byte-ordering and go via cache |
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456 i = remap_instruction_operand_from_cache(which); |
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457 } else { |
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458 if (tag_at(which).is_invoke_dynamic()) { |
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459 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); |
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460 assert(tag_at(pool_index).is_name_and_type(), ""); |
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461 return pool_index; |
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462 } |
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463 } |
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464 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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465 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); |
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466 jint ref_index = *int_at_addr(i); |
0 | 467 return extract_high_short_from_int(ref_index); |
468 } | |
469 | |
470 | |
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471 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { |
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472 guarantee(!ConstantPool::is_invokedynamic_index(which), |
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473 "an invokedynamic instruction does not have a klass"); |
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474 int i = which; |
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475 if (!uncached && cache() != NULL) { |
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476 // change byte-ordering and go via cache |
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477 i = remap_instruction_operand_from_cache(which); |
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478 } |
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479 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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480 jint ref_index = *int_at_addr(i); |
0 | 481 return extract_low_short_from_int(ref_index); |
482 } | |
483 | |
484 | |
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485 |
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486 int ConstantPool::remap_instruction_operand_from_cache(int operand) { |
1565 | 487 int cpc_index = operand; |
488 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); | |
489 assert((int)(u2)cpc_index == cpc_index, "clean u2"); | |
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490 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); |
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491 return member_index; |
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492 } |
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493 |
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494 |
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495 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) { |
0 | 496 if (k->oop_is_instance() || k->oop_is_objArray()) { |
497 instanceKlassHandle holder (THREAD, this_oop->pool_holder()); | |
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498 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); |
0 | 499 KlassHandle element (THREAD, elem_oop); |
500 | |
501 // The element type could be a typeArray - we only need the access check if it is | |
502 // an reference to another class | |
503 if (element->oop_is_instance()) { | |
504 LinkResolver::check_klass_accessability(holder, element, CHECK); | |
505 } | |
506 } | |
507 } | |
508 | |
509 | |
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510 int ConstantPool::name_ref_index_at(int which_nt) { |
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511 jint ref_index = name_and_type_at(which_nt); |
0 | 512 return extract_low_short_from_int(ref_index); |
513 } | |
514 | |
515 | |
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516 int ConstantPool::signature_ref_index_at(int which_nt) { |
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517 jint ref_index = name_and_type_at(which_nt); |
0 | 518 return extract_high_short_from_int(ref_index); |
519 } | |
520 | |
521 | |
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522 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { |
0 | 523 return klass_at(klass_ref_index_at(which), CHECK_NULL); |
524 } | |
525 | |
526 | |
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527 Symbol* ConstantPool::klass_name_at(int which) { |
0 | 528 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), |
529 "Corrupted constant pool"); | |
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530 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
0 | 531 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and |
532 // tag is not updated atomicly. | |
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533 CPSlot entry = slot_at(which); |
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534 if (entry.is_resolved()) { |
0 | 535 // Already resolved - return entry's name. |
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536 assert(entry.get_klass()->is_klass(), "must be"); |
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537 return entry.get_klass()->name(); |
0 | 538 } else { |
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539 assert(entry.is_unresolved(), "must be either symbol or klass"); |
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540 return entry.get_symbol(); |
0 | 541 } |
542 } | |
543 | |
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544 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { |
0 | 545 jint ref_index = klass_ref_index_at(which); |
546 return klass_at_noresolve(ref_index); | |
547 } | |
548 | |
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549 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { |
1602 | 550 jint ref_index = uncached_klass_ref_index_at(which); |
551 return klass_at_noresolve(ref_index); | |
552 } | |
553 | |
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554 char* ConstantPool::string_at_noresolve(int which) { |
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555 Symbol* s = unresolved_string_at(which); |
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556 if (s == NULL) { |
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557 return (char*)"<pseudo-string>"; |
0 | 558 } else { |
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559 return unresolved_string_at(which)->as_C_string(); |
0 | 560 } |
561 } | |
562 | |
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563 BasicType ConstantPool::basic_type_for_signature_at(int which) { |
0 | 564 return FieldType::basic_type(symbol_at(which)); |
565 } | |
566 | |
567 | |
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568 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) { |
0 | 569 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused |
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570 if (this_oop->tag_at(index).is_string()) { |
0 | 571 this_oop->string_at(index, CHECK); |
572 } | |
573 } | |
574 } | |
575 | |
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576 // Resolve all the classes in the constant pool. If they are all resolved, |
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577 // the constant pool is read-only. Enhancement: allocate cp entries to |
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578 // another metaspace, and copy to read-only or read-write space if this |
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579 // bit is set. |
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580 bool ConstantPool::resolve_class_constants(TRAPS) { |
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581 constantPoolHandle cp(THREAD, this); |
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582 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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583 if (tag_at(index).is_unresolved_klass() && |
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584 klass_at_if_loaded(cp, index) == NULL) { |
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585 return false; |
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586 } |
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587 } |
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588 // set_preresolution(); or some bit for future use |
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589 return true; |
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590 } |
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591 |
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592 // If resolution for MethodHandle or MethodType fails, save the exception |
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593 // in the resolution error table, so that the same exception is thrown again. |
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594 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which, |
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595 int tag, TRAPS) { |
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596 ResourceMark rm; |
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597 Symbol* error = PENDING_EXCEPTION->klass()->name(); |
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598 MonitorLockerEx ml(this_oop->lock()); // lock cpool to change tag. |
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599 |
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600 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ? |
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601 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError; |
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602 |
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603 if (!PENDING_EXCEPTION-> |
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604 is_a(SystemDictionary::LinkageError_klass())) { |
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605 // Just throw the exception and don't prevent these classes from |
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606 // being loaded due to virtual machine errors like StackOverflow |
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607 // and OutOfMemoryError, etc, or if the thread was hit by stop() |
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608 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) |
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609 |
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610 } else if (this_oop->tag_at(which).value() != error_tag) { |
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611 SystemDictionary::add_resolution_error(this_oop, which, error); |
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612 this_oop->tag_at_put(which, error_tag); |
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613 } else { |
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614 // some other thread has put the class in error state. |
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615 error = SystemDictionary::find_resolution_error(this_oop, which); |
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616 assert(error != NULL, "checking"); |
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617 CLEAR_PENDING_EXCEPTION; |
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618 THROW_MSG(error, ""); |
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619 } |
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620 } |
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621 |
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622 |
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623 // Called to resolve constants in the constant pool and return an oop. |
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624 // Some constant pool entries cache their resolved oop. This is also |
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625 // called to create oops from constants to use in arguments for invokedynamic |
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626 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) { |
1602 | 627 oop result_oop = NULL; |
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628 Handle throw_exception; |
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629 |
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630 if (cache_index == _possible_index_sentinel) { |
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631 // It is possible that this constant is one which is cached in the objects. |
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632 // We'll do a linear search. This should be OK because this usage is rare. |
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633 assert(index > 0, "valid index"); |
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634 cache_index = this_oop->cp_to_object_index(index); |
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635 } |
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636 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); |
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637 assert(index == _no_index_sentinel || index >= 0, ""); |
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638 |
1602 | 639 if (cache_index >= 0) { |
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640 result_oop = this_oop->resolved_references()->obj_at(cache_index); |
1602 | 641 if (result_oop != NULL) { |
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642 return result_oop; |
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643 // That was easy... |
1602 | 644 } |
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645 index = this_oop->object_to_cp_index(cache_index); |
1602 | 646 } |
647 | |
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648 jvalue prim_value; // temp used only in a few cases below |
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649 |
1602 | 650 int tag_value = this_oop->tag_at(index).value(); |
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651 |
1602 | 652 switch (tag_value) { |
653 | |
654 case JVM_CONSTANT_UnresolvedClass: | |
655 case JVM_CONSTANT_UnresolvedClassInError: | |
656 case JVM_CONSTANT_Class: | |
657 { | |
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658 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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659 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL); |
1602 | 660 // ldc wants the java mirror. |
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661 result_oop = resolved->java_mirror(); |
1602 | 662 break; |
663 } | |
664 | |
665 case JVM_CONSTANT_String: | |
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666 assert(cache_index != _no_index_sentinel, "should have been set"); |
1602 | 667 if (this_oop->is_pseudo_string_at(index)) { |
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668 result_oop = this_oop->pseudo_string_at(index, cache_index); |
1602 | 669 break; |
670 } | |
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671 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL); |
1602 | 672 break; |
673 | |
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674 case JVM_CONSTANT_MethodHandleInError: |
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675 case JVM_CONSTANT_MethodTypeInError: |
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676 { |
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677 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index); |
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678 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); |
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679 ResourceMark rm; |
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680 THROW_MSG_0(error, ""); |
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681 break; |
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682 } |
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683 |
1602 | 684 case JVM_CONSTANT_MethodHandle: |
685 { | |
686 int ref_kind = this_oop->method_handle_ref_kind_at(index); | |
687 int callee_index = this_oop->method_handle_klass_index_at(index); | |
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688 Symbol* name = this_oop->method_handle_name_ref_at(index); |
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689 Symbol* signature = this_oop->method_handle_signature_ref_at(index); |
1602 | 690 if (PrintMiscellaneous) |
691 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", | |
692 ref_kind, index, this_oop->method_handle_index_at(index), | |
693 callee_index, name->as_C_string(), signature->as_C_string()); | |
694 KlassHandle callee; | |
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695 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL); |
1602 | 696 callee = KlassHandle(THREAD, k); |
697 } | |
698 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
699 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, | |
700 callee, name, signature, | |
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701 THREAD); |
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702 result_oop = value(); |
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703 if (HAS_PENDING_EXCEPTION) { |
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704 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); |
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705 } |
1602 | 706 break; |
707 } | |
708 | |
709 case JVM_CONSTANT_MethodType: | |
710 { | |
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711 Symbol* signature = this_oop->method_type_signature_at(index); |
1602 | 712 if (PrintMiscellaneous) |
713 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", | |
714 index, this_oop->method_type_index_at(index), | |
715 signature->as_C_string()); | |
716 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
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717 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); |
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718 result_oop = value(); |
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719 if (HAS_PENDING_EXCEPTION) { |
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720 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); |
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721 } |
1602 | 722 break; |
723 } | |
724 | |
725 case JVM_CONSTANT_Integer: | |
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726 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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727 prim_value.i = this_oop->int_at(index); |
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728 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); |
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729 break; |
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730 |
1602 | 731 case JVM_CONSTANT_Float: |
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732 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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733 prim_value.f = this_oop->float_at(index); |
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734 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); |
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735 break; |
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736 |
1602 | 737 case JVM_CONSTANT_Long: |
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738 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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739 prim_value.j = this_oop->long_at(index); |
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740 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); |
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741 break; |
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742 |
1602 | 743 case JVM_CONSTANT_Double: |
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744 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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745 prim_value.d = this_oop->double_at(index); |
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746 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); |
1602 | 747 break; |
748 | |
749 default: | |
750 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", | |
751 this_oop(), index, cache_index, tag_value) ); | |
752 assert(false, "unexpected constant tag"); | |
753 break; | |
754 } | |
755 | |
756 if (cache_index >= 0) { | |
757 // Cache the oop here also. | |
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758 Handle result_handle(THREAD, result_oop); |
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759 MonitorLockerEx ml(this_oop->lock()); // don't know if we really need this |
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760 oop result = this_oop->resolved_references()->obj_at(cache_index); |
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761 // Benign race condition: resolved_references may already be filled in while we were trying to lock. |
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762 // The important thing here is that all threads pick up the same result. |
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763 // It doesn't matter which racing thread wins, as long as only one |
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764 // result is used by all threads, and all future queries. |
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765 // That result may be either a resolved constant or a failure exception. |
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766 if (result == NULL) { |
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767 this_oop->resolved_references()->obj_at_put(cache_index, result_handle()); |
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768 return result_handle(); |
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769 } else { |
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770 // Return the winning thread's result. This can be different than |
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771 // result_handle() for MethodHandles. |
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772 return result; |
1602 | 773 } |
774 } else { | |
775 return result_oop; | |
776 } | |
777 } | |
778 | |
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779 oop ConstantPool::uncached_string_at(int which, TRAPS) { |
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780 Symbol* sym = unresolved_string_at(which); |
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781 oop str = StringTable::intern(sym, CHECK_(NULL)); |
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782 assert(java_lang_String::is_instance(str), "must be string"); |
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783 return str; |
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784 } |
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785 |
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786 |
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787 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) { |
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788 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); |
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789 |
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790 Handle bsm; |
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791 int argc; |
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792 { |
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793 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments |
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794 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. |
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795 // It is accompanied by the optional arguments. |
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796 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index); |
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797 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); |
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798 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { |
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799 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); |
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800 } |
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801 |
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802 // Extract the optional static arguments. |
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803 argc = this_oop->invoke_dynamic_argument_count_at(index); |
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804 if (argc == 0) return bsm_oop; |
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805 |
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806 bsm = Handle(THREAD, bsm_oop); |
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807 } |
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808 |
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809 objArrayHandle info; |
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810 { |
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811 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); |
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812 info = objArrayHandle(THREAD, info_oop); |
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813 } |
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814 |
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815 info->obj_at_put(0, bsm()); |
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816 for (int i = 0; i < argc; i++) { |
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817 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i); |
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818 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); |
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819 info->obj_at_put(1+i, arg_oop); |
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820 } |
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821 |
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822 return info(); |
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823 } |
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824 |
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825 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) { |
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826 // If the string has already been interned, this entry will be non-null |
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827 oop str = this_oop->resolved_references()->obj_at(obj_index); |
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828 if (str != NULL) return str; |
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829 Symbol* sym = this_oop->unresolved_string_at(which); |
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830 str = StringTable::intern(sym, CHECK_(NULL)); |
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831 this_oop->string_at_put(which, obj_index, str); |
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832 assert(java_lang_String::is_instance(str), "must be string"); |
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833 return str; |
0 | 834 } |
835 | |
836 | |
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837 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, |
0 | 838 int which) { |
2177
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839 // Names are interned, so we can compare Symbol*s directly |
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840 Symbol* cp_name = klass_name_at(which); |
0 | 841 return (cp_name == k->name()); |
842 } | |
843 | |
844 | |
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845 // Iterate over symbols and decrement ones which are Symbol*s. |
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846 // This is done during GC so do not need to lock constantPool unless we |
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847 // have per-thread safepoints. |
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848 // Only decrement the UTF8 symbols. Unresolved classes and strings point to |
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849 // these symbols but didn't increment the reference count. |
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850 void ConstantPool::unreference_symbols() { |
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851 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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852 constantTag tag = tag_at(index); |
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853 if (tag.is_symbol()) { |
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854 symbol_at(index)->decrement_refcount(); |
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855 } |
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856 } |
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857 } |
0 | 858 |
859 | |
860 // Compare this constant pool's entry at index1 to the constant pool | |
861 // cp2's entry at index2. | |
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862 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2, |
0 | 863 int index2, TRAPS) { |
864 | |
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865 // The error tags are equivalent to non-error tags when comparing |
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866 jbyte t1 = tag_at(index1).non_error_value(); |
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867 jbyte t2 = cp2->tag_at(index2).non_error_value(); |
0 | 868 |
869 if (t1 != t2) { | |
870 // Not the same entry type so there is nothing else to check. Note | |
871 // that this style of checking will consider resolved/unresolved | |
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872 // class pairs as different. |
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873 // From the ConstantPool* API point of view, this is correct |
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874 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this |
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875 // plays out in the context of ConstantPool* merging. |
0 | 876 return false; |
877 } | |
878 | |
879 switch (t1) { | |
880 case JVM_CONSTANT_Class: | |
881 { | |
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882 Klass* k1 = klass_at(index1, CHECK_false); |
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883 Klass* k2 = cp2->klass_at(index2, CHECK_false); |
0 | 884 if (k1 == k2) { |
885 return true; | |
886 } | |
887 } break; | |
888 | |
889 case JVM_CONSTANT_ClassIndex: | |
890 { | |
891 int recur1 = klass_index_at(index1); | |
892 int recur2 = cp2->klass_index_at(index2); | |
893 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
894 if (match) { | |
895 return true; | |
896 } | |
897 } break; | |
898 | |
899 case JVM_CONSTANT_Double: | |
900 { | |
901 jdouble d1 = double_at(index1); | |
902 jdouble d2 = cp2->double_at(index2); | |
903 if (d1 == d2) { | |
904 return true; | |
905 } | |
906 } break; | |
907 | |
908 case JVM_CONSTANT_Fieldref: | |
909 case JVM_CONSTANT_InterfaceMethodref: | |
910 case JVM_CONSTANT_Methodref: | |
911 { | |
912 int recur1 = uncached_klass_ref_index_at(index1); | |
913 int recur2 = cp2->uncached_klass_ref_index_at(index2); | |
914 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
915 if (match) { | |
916 recur1 = uncached_name_and_type_ref_index_at(index1); | |
917 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); | |
918 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
919 if (match) { | |
920 return true; | |
921 } | |
922 } | |
923 } break; | |
924 | |
925 case JVM_CONSTANT_Float: | |
926 { | |
927 jfloat f1 = float_at(index1); | |
928 jfloat f2 = cp2->float_at(index2); | |
929 if (f1 == f2) { | |
930 return true; | |
931 } | |
932 } break; | |
933 | |
934 case JVM_CONSTANT_Integer: | |
935 { | |
936 jint i1 = int_at(index1); | |
937 jint i2 = cp2->int_at(index2); | |
938 if (i1 == i2) { | |
939 return true; | |
940 } | |
941 } break; | |
942 | |
943 case JVM_CONSTANT_Long: | |
944 { | |
945 jlong l1 = long_at(index1); | |
946 jlong l2 = cp2->long_at(index2); | |
947 if (l1 == l2) { | |
948 return true; | |
949 } | |
950 } break; | |
951 | |
952 case JVM_CONSTANT_NameAndType: | |
953 { | |
954 int recur1 = name_ref_index_at(index1); | |
955 int recur2 = cp2->name_ref_index_at(index2); | |
956 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
957 if (match) { | |
958 recur1 = signature_ref_index_at(index1); | |
959 recur2 = cp2->signature_ref_index_at(index2); | |
960 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
961 if (match) { | |
962 return true; | |
963 } | |
964 } | |
965 } break; | |
966 | |
967 case JVM_CONSTANT_StringIndex: | |
968 { | |
969 int recur1 = string_index_at(index1); | |
970 int recur2 = cp2->string_index_at(index2); | |
971 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
972 if (match) { | |
973 return true; | |
974 } | |
975 } break; | |
976 | |
977 case JVM_CONSTANT_UnresolvedClass: | |
978 { | |
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979 Symbol* k1 = unresolved_klass_at(index1); |
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980 Symbol* k2 = cp2->unresolved_klass_at(index2); |
0 | 981 if (k1 == k2) { |
982 return true; | |
983 } | |
984 } break; | |
985 | |
1602 | 986 case JVM_CONSTANT_MethodType: |
987 { | |
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988 int k1 = method_type_index_at_error_ok(index1); |
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989 int k2 = cp2->method_type_index_at_error_ok(index2); |
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990 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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991 if (match) { |
1602 | 992 return true; |
993 } | |
994 } break; | |
995 | |
996 case JVM_CONSTANT_MethodHandle: | |
997 { | |
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998 int k1 = method_handle_ref_kind_at_error_ok(index1); |
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999 int k2 = cp2->method_handle_ref_kind_at_error_ok(index2); |
1602 | 1000 if (k1 == k2) { |
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1001 int i1 = method_handle_index_at_error_ok(index1); |
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1002 int i2 = cp2->method_handle_index_at_error_ok(index2); |
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1003 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); |
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1004 if (match) { |
1602 | 1005 return true; |
1006 } | |
1007 } | |
1008 } break; | |
1009 | |
1660
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1010 case JVM_CONSTANT_InvokeDynamic: |
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1011 { |
10151
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1012 int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); |
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1013 int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); |
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1014 int i1 = invoke_dynamic_bootstrap_specifier_index(index1); |
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1015 int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); |
10350 | 1016 // separate statements and variables because CHECK_false is used |
1017 bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); | |
1018 bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); | |
1019 return (match_entry && match_operand); | |
1660
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1020 } break; |
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1021 |
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1022 case JVM_CONSTANT_String: |
0 | 1023 { |
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1024 Symbol* s1 = unresolved_string_at(index1); |
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1025 Symbol* s2 = cp2->unresolved_string_at(index2); |
0 | 1026 if (s1 == s2) { |
1027 return true; | |
1028 } | |
1029 } break; | |
1030 | |
1031 case JVM_CONSTANT_Utf8: | |
1032 { | |
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1033 Symbol* s1 = symbol_at(index1); |
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1034 Symbol* s2 = cp2->symbol_at(index2); |
0 | 1035 if (s1 == s2) { |
1036 return true; | |
1037 } | |
1038 } break; | |
1039 | |
1040 // Invalid is used as the tag for the second constant pool entry | |
1041 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1042 // not be seen by itself. | |
1043 case JVM_CONSTANT_Invalid: // fall through | |
1044 | |
1045 default: | |
1046 ShouldNotReachHere(); | |
1047 break; | |
1048 } | |
1049 | |
1050 return false; | |
1051 } // end compare_entry_to() | |
1052 | |
1053 | |
10151
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1054 // Resize the operands array with delta_len and delta_size. |
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1055 // Used in RedefineClasses for CP merge. |
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1056 void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { |
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1057 int old_len = operand_array_length(operands()); |
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1058 int new_len = old_len + delta_len; |
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1059 int min_len = (delta_len > 0) ? old_len : new_len; |
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1060 |
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1061 int old_size = operands()->length(); |
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1062 int new_size = old_size + delta_size; |
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1063 int min_size = (delta_size > 0) ? old_size : new_size; |
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1064 |
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1065 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
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1066 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); |
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1067 |
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1068 // Set index in the resized array for existing elements only |
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1069 for (int idx = 0; idx < min_len; idx++) { |
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1070 int offset = operand_offset_at(idx); // offset in original array |
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1071 operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array |
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1072 } |
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1073 // Copy the bootstrap specifiers only |
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1074 Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), |
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1075 new_ops->adr_at(2*new_len), |
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1076 (min_size - 2*min_len) * sizeof(u2)); |
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1077 // Explicitly deallocate old operands array. |
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1078 // Note, it is not needed for 7u backport. |
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1079 if ( operands() != NULL) { // the safety check |
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1080 MetadataFactory::free_array<u2>(loader_data, operands()); |
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1081 } |
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1082 set_operands(new_ops); |
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1083 } // end resize_operands() |
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1084 |
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1085 |
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1086 // Extend the operands array with the length and size of the ext_cp operands. |
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1087 // Used in RedefineClasses for CP merge. |
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1088 void ConstantPool::extend_operands(constantPoolHandle ext_cp, TRAPS) { |
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1089 int delta_len = operand_array_length(ext_cp->operands()); |
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1090 if (delta_len == 0) { |
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1091 return; // nothing to do |
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1092 } |
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1093 int delta_size = ext_cp->operands()->length(); |
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1094 |
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1095 assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); |
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1096 |
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1097 if (operand_array_length(operands()) == 0) { |
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1098 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
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1099 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); |
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1100 // The first element index defines the offset of second part |
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1101 operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array |
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1102 set_operands(new_ops); |
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1103 } else { |
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1104 resize_operands(delta_len, delta_size, CHECK); |
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1105 } |
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1106 |
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1107 } // end extend_operands() |
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1108 |
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1109 |
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1110 // Shrink the operands array to a smaller array with new_len length. |
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1111 // Used in RedefineClasses for CP merge. |
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1112 void ConstantPool::shrink_operands(int new_len, TRAPS) { |
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1113 int old_len = operand_array_length(operands()); |
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1114 if (new_len == old_len) { |
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1115 return; // nothing to do |
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1116 } |
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1117 assert(new_len < old_len, "shrunken operands array must be smaller"); |
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1118 |
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1119 int free_base = operand_next_offset_at(new_len - 1); |
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1120 int delta_len = new_len - old_len; |
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1121 int delta_size = 2*delta_len + free_base - operands()->length(); |
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1122 |
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1123 resize_operands(delta_len, delta_size, CHECK); |
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1124 |
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1125 } // end shrink_operands() |
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1126 |
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1127 |
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1128 void ConstantPool::copy_operands(constantPoolHandle from_cp, |
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1129 constantPoolHandle to_cp, |
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1130 TRAPS) { |
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1131 |
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1132 int from_oplen = operand_array_length(from_cp->operands()); |
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1133 int old_oplen = operand_array_length(to_cp->operands()); |
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1134 if (from_oplen != 0) { |
6934 | 1135 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); |
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1136 // append my operands to the target's operands array |
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1137 if (old_oplen == 0) { |
6934 | 1138 // Can't just reuse from_cp's operand list because of deallocation issues |
1139 int len = from_cp->operands()->length(); | |
1140 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); | |
1141 Copy::conjoint_memory_atomic( | |
1142 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); | |
1143 to_cp->set_operands(new_ops); | |
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1144 } else { |
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1145 int old_len = to_cp->operands()->length(); |
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1146 int from_len = from_cp->operands()->length(); |
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1147 int old_off = old_oplen * sizeof(u2); |
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1148 int from_off = from_oplen * sizeof(u2); |
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1149 // Use the metaspace for the destination constant pool |
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1150 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); |
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1151 int fillp = 0, len = 0; |
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1152 // first part of dest |
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1153 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), |
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1154 new_operands->adr_at(fillp), |
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1155 (len = old_off) * sizeof(u2)); |
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1156 fillp += len; |
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1157 // first part of src |
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1158 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), |
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1159 new_operands->adr_at(fillp), |
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1160 (len = from_off) * sizeof(u2)); |
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1161 fillp += len; |
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1162 // second part of dest |
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1163 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), |
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1164 new_operands->adr_at(fillp), |
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1165 (len = old_len - old_off) * sizeof(u2)); |
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1166 fillp += len; |
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1167 // second part of src |
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1168 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), |
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1169 new_operands->adr_at(fillp), |
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1170 (len = from_len - from_off) * sizeof(u2)); |
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1171 fillp += len; |
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1172 assert(fillp == new_operands->length(), ""); |
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1173 |
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1174 // Adjust indexes in the first part of the copied operands array. |
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1175 for (int j = 0; j < from_oplen; j++) { |
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1176 int offset = operand_offset_at(new_operands, old_oplen + j); |
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1177 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); |
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1178 offset += old_len; // every new tuple is preceded by old_len extra u2's |
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1179 operand_offset_at_put(new_operands, old_oplen + j, offset); |
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1180 } |
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1181 |
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1182 // replace target operands array with combined array |
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1183 to_cp->set_operands(new_operands); |
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1184 } |
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1185 } |
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1186 } // end copy_operands() |
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1187 |
7952
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1188 |
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1189 // Copy this constant pool's entries at start_i to end_i (inclusive) |
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1190 // to the constant pool to_cp's entries starting at to_i. A total of |
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1191 // (end_i - start_i) + 1 entries are copied. |
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1192 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, |
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1193 constantPoolHandle to_cp, int to_i, TRAPS) { |
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1194 |
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1195 |
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1196 int dest_i = to_i; // leave original alone for debug purposes |
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1197 |
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1198 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { |
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1199 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); |
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1200 |
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1201 switch (from_cp->tag_at(src_i).value()) { |
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1202 case JVM_CONSTANT_Double: |
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1203 case JVM_CONSTANT_Long: |
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1204 // double and long take two constant pool entries |
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1205 src_i += 2; |
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1206 dest_i += 2; |
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1207 break; |
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1208 |
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1209 default: |
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1210 // all others take one constant pool entry |
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1211 src_i++; |
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1212 dest_i++; |
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1213 break; |
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1214 } |
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1215 } |
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1216 copy_operands(from_cp, to_cp, CHECK); |
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1217 |
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1218 } // end copy_cp_to_impl() |
0 | 1219 |
1220 | |
1221 // Copy this constant pool's entry at from_i to the constant pool | |
1222 // to_cp's entry at to_i. | |
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1223 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i, |
2011
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1224 constantPoolHandle to_cp, int to_i, |
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1225 TRAPS) { |
0 | 1226 |
2011
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1227 int tag = from_cp->tag_at(from_i).value(); |
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diff
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|
1228 switch (tag) { |
0 | 1229 case JVM_CONSTANT_Class: |
1230 { | |
6725
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1231 Klass* k = from_cp->klass_at(from_i, CHECK); |
0 | 1232 to_cp->klass_at_put(to_i, k); |
1233 } break; | |
1234 | |
1235 case JVM_CONSTANT_ClassIndex: | |
1236 { | |
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|
1237 jint ki = from_cp->klass_index_at(from_i); |
0 | 1238 to_cp->klass_index_at_put(to_i, ki); |
1239 } break; | |
1240 | |
1241 case JVM_CONSTANT_Double: | |
1242 { | |
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|
1243 jdouble d = from_cp->double_at(from_i); |
0 | 1244 to_cp->double_at_put(to_i, d); |
1245 // double takes two constant pool entries so init second entry's tag | |
1246 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1247 } break; | |
1248 | |
1249 case JVM_CONSTANT_Fieldref: | |
1250 { | |
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1251 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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changeset
|
1252 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1253 to_cp->field_at_put(to_i, class_index, name_and_type_index); |
1254 } break; | |
1255 | |
1256 case JVM_CONSTANT_Float: | |
1257 { | |
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changeset
|
1258 jfloat f = from_cp->float_at(from_i); |
0 | 1259 to_cp->float_at_put(to_i, f); |
1260 } break; | |
1261 | |
1262 case JVM_CONSTANT_Integer: | |
1263 { | |
2011
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|
1264 jint i = from_cp->int_at(from_i); |
0 | 1265 to_cp->int_at_put(to_i, i); |
1266 } break; | |
1267 | |
1268 case JVM_CONSTANT_InterfaceMethodref: | |
1269 { | |
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|
1270 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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|
1271 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1272 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); |
1273 } break; | |
1274 | |
1275 case JVM_CONSTANT_Long: | |
1276 { | |
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|
1277 jlong l = from_cp->long_at(from_i); |
0 | 1278 to_cp->long_at_put(to_i, l); |
1279 // long takes two constant pool entries so init second entry's tag | |
1280 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1281 } break; | |
1282 | |
1283 case JVM_CONSTANT_Methodref: | |
1284 { | |
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1285 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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|
1286 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1287 to_cp->method_at_put(to_i, class_index, name_and_type_index); |
1288 } break; | |
1289 | |
1290 case JVM_CONSTANT_NameAndType: | |
1291 { | |
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1292 int name_ref_index = from_cp->name_ref_index_at(from_i); |
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|
1293 int signature_ref_index = from_cp->signature_ref_index_at(from_i); |
0 | 1294 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); |
1295 } break; | |
1296 | |
1297 case JVM_CONSTANT_StringIndex: | |
1298 { | |
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|
1299 jint si = from_cp->string_index_at(from_i); |
0 | 1300 to_cp->string_index_at_put(to_i, si); |
1301 } break; | |
1302 | |
1303 case JVM_CONSTANT_UnresolvedClass: | |
17696
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|
1304 case JVM_CONSTANT_UnresolvedClassInError: |
0 | 1305 { |
2332
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|
1306 // Can be resolved after checking tag, so check the slot first. |
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coleenp
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2177
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changeset
|
1307 CPSlot entry = from_cp->slot_at(from_i); |
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1308 if (entry.is_resolved()) { |
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1309 assert(entry.get_klass()->is_klass(), "must be"); |
2332
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|
1310 // Already resolved |
6725
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1311 to_cp->klass_at_put(to_i, entry.get_klass()); |
2332
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|
1312 } else { |
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|
1313 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); |
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|
1314 } |
0 | 1315 } break; |
1316 | |
6725
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|
1317 case JVM_CONSTANT_String: |
0 | 1318 { |
6725
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1319 Symbol* s = from_cp->unresolved_string_at(from_i); |
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|
1320 to_cp->unresolved_string_at_put(to_i, s); |
0 | 1321 } break; |
1322 | |
1323 case JVM_CONSTANT_Utf8: | |
1324 { | |
2177
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6990754: Use native memory and reference counting to implement SymbolTable
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|
1325 Symbol* s = from_cp->symbol_at(from_i); |
6725
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1326 // Need to increase refcount, the old one will be thrown away and deferenced |
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|
1327 s->increment_refcount(); |
0 | 1328 to_cp->symbol_at_put(to_i, s); |
1329 } break; | |
1330 | |
1602 | 1331 case JVM_CONSTANT_MethodType: |
12845
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changeset
|
1332 case JVM_CONSTANT_MethodTypeInError: |
1602 | 1333 { |
12845
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coleenp
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12316
diff
changeset
|
1334 jint k = from_cp->method_type_index_at_error_ok(from_i); |
1602 | 1335 to_cp->method_type_index_at_put(to_i, k); |
1336 } break; | |
1337 | |
1338 case JVM_CONSTANT_MethodHandle: | |
12845
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8025185: MethodHandleInError and MethodTypeInError not handled in ConstantPool::compare_entry_to and copy_entry_to
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changeset
|
1339 case JVM_CONSTANT_MethodHandleInError: |
1602 | 1340 { |
12845
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12316
diff
changeset
|
1341 int k1 = from_cp->method_handle_ref_kind_at_error_ok(from_i); |
b4a4fdc1f464
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coleenp
parents:
12316
diff
changeset
|
1342 int k2 = from_cp->method_handle_index_at_error_ok(from_i); |
1602 | 1343 to_cp->method_handle_index_at_put(to_i, k1, k2); |
1344 } break; | |
1345 | |
1660
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1602
diff
changeset
|
1346 case JVM_CONSTANT_InvokeDynamic: |
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diff
changeset
|
1347 { |
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changeset
|
1348 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); |
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changeset
|
1349 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); |
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|
1350 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands |
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|
1351 to_cp->invoke_dynamic_at_put(to_i, k1, k2); |
1660
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1602
diff
changeset
|
1352 } break; |
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1602
diff
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|
1353 |
0 | 1354 // Invalid is used as the tag for the second constant pool entry |
1355 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1356 // not be seen by itself. | |
1357 case JVM_CONSTANT_Invalid: // fall through | |
1358 | |
1359 default: | |
1360 { | |
1361 ShouldNotReachHere(); | |
1362 } break; | |
1363 } | |
1364 } // end copy_entry_to() | |
1365 | |
1366 | |
1367 // Search constant pool search_cp for an entry that matches this | |
1368 // constant pool's entry at pattern_i. Returns the index of a | |
1369 // matching entry or zero (0) if there is no matching entry. | |
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1370 int ConstantPool::find_matching_entry(int pattern_i, |
0 | 1371 constantPoolHandle search_cp, TRAPS) { |
1372 | |
1373 // index zero (0) is not used | |
1374 for (int i = 1; i < search_cp->length(); i++) { | |
1375 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); | |
1376 if (found) { | |
1377 return i; | |
1378 } | |
1379 } | |
1380 | |
1381 return 0; // entry not found; return unused index zero (0) | |
1382 } // end find_matching_entry() | |
1383 | |
1384 | |
10151
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1385 // Compare this constant pool's bootstrap specifier at idx1 to the constant pool |
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1386 // cp2's bootstrap specifier at idx2. |
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1387 bool ConstantPool::compare_operand_to(int idx1, constantPoolHandle cp2, int idx2, TRAPS) { |
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1388 int k1 = operand_bootstrap_method_ref_index_at(idx1); |
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1389 int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); |
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1390 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1391 |
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1392 if (!match) { |
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1393 return false; |
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1394 } |
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1395 int argc = operand_argument_count_at(idx1); |
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1396 if (argc == cp2->operand_argument_count_at(idx2)) { |
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1397 for (int j = 0; j < argc; j++) { |
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1398 k1 = operand_argument_index_at(idx1, j); |
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1399 k2 = cp2->operand_argument_index_at(idx2, j); |
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1400 match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1401 if (!match) { |
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1402 return false; |
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1403 } |
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1404 } |
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1405 return true; // got through loop; all elements equal |
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1406 } |
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1407 return false; |
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1408 } // end compare_operand_to() |
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1409 |
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1410 // Search constant pool search_cp for a bootstrap specifier that matches |
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1411 // this constant pool's bootstrap specifier at pattern_i index. |
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1412 // Return the index of a matching bootstrap specifier or (-1) if there is no match. |
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1413 int ConstantPool::find_matching_operand(int pattern_i, |
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1414 constantPoolHandle search_cp, int search_len, TRAPS) { |
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1415 for (int i = 0; i < search_len; i++) { |
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1416 bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); |
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1417 if (found) { |
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1418 return i; |
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1419 } |
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1420 } |
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1421 return -1; // bootstrap specifier not found; return unused index (-1) |
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1422 } // end find_matching_operand() |
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1423 |
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1424 |
0 | 1425 #ifndef PRODUCT |
1426 | |
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1427 const char* ConstantPool::printable_name_at(int which) { |
0 | 1428 |
1429 constantTag tag = tag_at(which); | |
1430 | |
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1431 if (tag.is_string()) { |
0 | 1432 return string_at_noresolve(which); |
1433 } else if (tag.is_klass() || tag.is_unresolved_klass()) { | |
1434 return klass_name_at(which)->as_C_string(); | |
1435 } else if (tag.is_symbol()) { | |
1436 return symbol_at(which)->as_C_string(); | |
1437 } | |
1438 return ""; | |
1439 } | |
1440 | |
1441 #endif // PRODUCT | |
1442 | |
1443 | |
1444 // JVMTI GetConstantPool support | |
1445 | |
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1446 // For debugging of constant pool |
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1447 const bool debug_cpool = false; |
0 | 1448 |
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1449 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) |
0 | 1450 |
1451 static void print_cpool_bytes(jint cnt, u1 *bytes) { | |
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1452 const char* WARN_MSG = "Must not be such entry!"; |
0 | 1453 jint size = 0; |
1454 u2 idx1, idx2; | |
1455 | |
1456 for (jint idx = 1; idx < cnt; idx++) { | |
1457 jint ent_size = 0; | |
1458 u1 tag = *bytes++; | |
1459 size++; // count tag | |
1460 | |
1461 printf("const #%03d, tag: %02d ", idx, tag); | |
1462 switch(tag) { | |
1463 case JVM_CONSTANT_Invalid: { | |
1464 printf("Invalid"); | |
1465 break; | |
1466 } | |
1467 case JVM_CONSTANT_Unicode: { | |
1468 printf("Unicode %s", WARN_MSG); | |
1469 break; | |
1470 } | |
1471 case JVM_CONSTANT_Utf8: { | |
1472 u2 len = Bytes::get_Java_u2(bytes); | |
1473 char str[128]; | |
1474 if (len > 127) { | |
1475 len = 127; | |
1476 } | |
1477 strncpy(str, (char *) (bytes+2), len); | |
1478 str[len] = '\0'; | |
1479 printf("Utf8 \"%s\"", str); | |
1480 ent_size = 2 + len; | |
1481 break; | |
1482 } | |
1483 case JVM_CONSTANT_Integer: { | |
1484 u4 val = Bytes::get_Java_u4(bytes); | |
1485 printf("int %d", *(int *) &val); | |
1486 ent_size = 4; | |
1487 break; | |
1488 } | |
1489 case JVM_CONSTANT_Float: { | |
1490 u4 val = Bytes::get_Java_u4(bytes); | |
1491 printf("float %5.3ff", *(float *) &val); | |
1492 ent_size = 4; | |
1493 break; | |
1494 } | |
1495 case JVM_CONSTANT_Long: { | |
1496 u8 val = Bytes::get_Java_u8(bytes); | |
3960 | 1497 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val); |
0 | 1498 ent_size = 8; |
1499 idx++; // Long takes two cpool slots | |
1500 break; | |
1501 } | |
1502 case JVM_CONSTANT_Double: { | |
1503 u8 val = Bytes::get_Java_u8(bytes); | |
1504 printf("double %5.3fd", *(jdouble *)&val); | |
1505 ent_size = 8; | |
1506 idx++; // Double takes two cpool slots | |
1507 break; | |
1508 } | |
1509 case JVM_CONSTANT_Class: { | |
1510 idx1 = Bytes::get_Java_u2(bytes); | |
1511 printf("class #%03d", idx1); | |
1512 ent_size = 2; | |
1513 break; | |
1514 } | |
1515 case JVM_CONSTANT_String: { | |
1516 idx1 = Bytes::get_Java_u2(bytes); | |
1517 printf("String #%03d", idx1); | |
1518 ent_size = 2; | |
1519 break; | |
1520 } | |
1521 case JVM_CONSTANT_Fieldref: { | |
1522 idx1 = Bytes::get_Java_u2(bytes); | |
1523 idx2 = Bytes::get_Java_u2(bytes+2); | |
1524 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); | |
1525 ent_size = 4; | |
1526 break; | |
1527 } | |
1528 case JVM_CONSTANT_Methodref: { | |
1529 idx1 = Bytes::get_Java_u2(bytes); | |
1530 idx2 = Bytes::get_Java_u2(bytes+2); | |
1531 printf("Method #%03d, #%03d", idx1, idx2); | |
1532 ent_size = 4; | |
1533 break; | |
1534 } | |
1535 case JVM_CONSTANT_InterfaceMethodref: { | |
1536 idx1 = Bytes::get_Java_u2(bytes); | |
1537 idx2 = Bytes::get_Java_u2(bytes+2); | |
1538 printf("InterfMethod #%03d, #%03d", idx1, idx2); | |
1539 ent_size = 4; | |
1540 break; | |
1541 } | |
1542 case JVM_CONSTANT_NameAndType: { | |
1543 idx1 = Bytes::get_Java_u2(bytes); | |
1544 idx2 = Bytes::get_Java_u2(bytes+2); | |
1545 printf("NameAndType #%03d, #%03d", idx1, idx2); | |
1546 ent_size = 4; | |
1547 break; | |
1548 } | |
1549 case JVM_CONSTANT_ClassIndex: { | |
1550 printf("ClassIndex %s", WARN_MSG); | |
1551 break; | |
1552 } | |
1553 case JVM_CONSTANT_UnresolvedClass: { | |
1554 printf("UnresolvedClass: %s", WARN_MSG); | |
1555 break; | |
1556 } | |
1557 case JVM_CONSTANT_UnresolvedClassInError: { | |
1558 printf("UnresolvedClassInErr: %s", WARN_MSG); | |
1559 break; | |
1560 } | |
1561 case JVM_CONSTANT_StringIndex: { | |
1562 printf("StringIndex: %s", WARN_MSG); | |
1563 break; | |
1564 } | |
1565 } | |
1566 printf(";\n"); | |
1567 bytes += ent_size; | |
1568 size += ent_size; | |
1569 } | |
1570 printf("Cpool size: %d\n", size); | |
1571 fflush(0); | |
1572 return; | |
1573 } /* end print_cpool_bytes */ | |
1574 | |
1575 | |
1576 // Returns size of constant pool entry. | |
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1577 jint ConstantPool::cpool_entry_size(jint idx) { |
0 | 1578 switch(tag_at(idx).value()) { |
1579 case JVM_CONSTANT_Invalid: | |
1580 case JVM_CONSTANT_Unicode: | |
1581 return 1; | |
1582 | |
1583 case JVM_CONSTANT_Utf8: | |
1584 return 3 + symbol_at(idx)->utf8_length(); | |
1585 | |
1586 case JVM_CONSTANT_Class: | |
1587 case JVM_CONSTANT_String: | |
1588 case JVM_CONSTANT_ClassIndex: | |
1589 case JVM_CONSTANT_UnresolvedClass: | |
1590 case JVM_CONSTANT_UnresolvedClassInError: | |
1591 case JVM_CONSTANT_StringIndex: | |
1602 | 1592 case JVM_CONSTANT_MethodType: |
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1593 case JVM_CONSTANT_MethodTypeInError: |
0 | 1594 return 3; |
1595 | |
1602 | 1596 case JVM_CONSTANT_MethodHandle: |
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1597 case JVM_CONSTANT_MethodHandleInError: |
1602 | 1598 return 4; //tag, ref_kind, ref_index |
1599 | |
0 | 1600 case JVM_CONSTANT_Integer: |
1601 case JVM_CONSTANT_Float: | |
1602 case JVM_CONSTANT_Fieldref: | |
1603 case JVM_CONSTANT_Methodref: | |
1604 case JVM_CONSTANT_InterfaceMethodref: | |
1605 case JVM_CONSTANT_NameAndType: | |
1913
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1606 return 5; |
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1607 |
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1608 case JVM_CONSTANT_InvokeDynamic: |
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1609 // u1 tag, u2 bsm, u2 nt |
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1610 return 5; |
0 | 1611 |
1612 case JVM_CONSTANT_Long: | |
1613 case JVM_CONSTANT_Double: | |
1614 return 9; | |
1615 } | |
1616 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); | |
1617 return 1; | |
1618 } /* end cpool_entry_size */ | |
1619 | |
1620 | |
1621 // SymbolHashMap is used to find a constant pool index from a string. | |
1622 // This function fills in SymbolHashMaps, one for utf8s and one for | |
1623 // class names, returns size of the cpool raw bytes. | |
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1624 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, |
0 | 1625 SymbolHashMap *classmap) { |
1626 jint size = 0; | |
1627 | |
1628 for (u2 idx = 1; idx < length(); idx++) { | |
1629 u2 tag = tag_at(idx).value(); | |
1630 size += cpool_entry_size(idx); | |
1631 | |
1632 switch(tag) { | |
1633 case JVM_CONSTANT_Utf8: { | |
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1634 Symbol* sym = symbol_at(idx); |
0 | 1635 symmap->add_entry(sym, idx); |
1636 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); | |
1637 break; | |
1638 } | |
1639 case JVM_CONSTANT_Class: | |
1640 case JVM_CONSTANT_UnresolvedClass: | |
1641 case JVM_CONSTANT_UnresolvedClassInError: { | |
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1642 Symbol* sym = klass_name_at(idx); |
0 | 1643 classmap->add_entry(sym, idx); |
1644 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); | |
1645 break; | |
1646 } | |
1647 case JVM_CONSTANT_Long: | |
1648 case JVM_CONSTANT_Double: { | |
1649 idx++; // Both Long and Double take two cpool slots | |
1650 break; | |
1651 } | |
1652 } | |
1653 } | |
1654 return size; | |
1655 } /* end hash_utf8_entries_to */ | |
1656 | |
1657 | |
1658 // Copy cpool bytes. | |
1659 // Returns: | |
1660 // 0, in case of OutOfMemoryError | |
1661 // -1, in case of internal error | |
1662 // > 0, count of the raw cpool bytes that have been copied | |
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1663 int ConstantPool::copy_cpool_bytes(int cpool_size, |
0 | 1664 SymbolHashMap* tbl, |
1665 unsigned char *bytes) { | |
1666 u2 idx1, idx2; | |
1667 jint size = 0; | |
1668 jint cnt = length(); | |
1669 unsigned char *start_bytes = bytes; | |
1670 | |
1671 for (jint idx = 1; idx < cnt; idx++) { | |
1672 u1 tag = tag_at(idx).value(); | |
1673 jint ent_size = cpool_entry_size(idx); | |
1674 | |
1675 assert(size + ent_size <= cpool_size, "Size mismatch"); | |
1676 | |
1677 *bytes = tag; | |
1678 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); | |
1679 switch(tag) { | |
1680 case JVM_CONSTANT_Invalid: { | |
1681 DBG(printf("JVM_CONSTANT_Invalid")); | |
1682 break; | |
1683 } | |
1684 case JVM_CONSTANT_Unicode: { | |
1685 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); | |
1686 DBG(printf("JVM_CONSTANT_Unicode")); | |
1687 break; | |
1688 } | |
1689 case JVM_CONSTANT_Utf8: { | |
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1690 Symbol* sym = symbol_at(idx); |
0 | 1691 char* str = sym->as_utf8(); |
1692 // Warning! It's crashing on x86 with len = sym->utf8_length() | |
1693 int len = (int) strlen(str); | |
1694 Bytes::put_Java_u2((address) (bytes+1), (u2) len); | |
1695 for (int i = 0; i < len; i++) { | |
1696 bytes[3+i] = (u1) str[i]; | |
1697 } | |
1698 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); | |
1699 break; | |
1700 } | |
1701 case JVM_CONSTANT_Integer: { | |
1702 jint val = int_at(idx); | |
1703 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1704 break; | |
1705 } | |
1706 case JVM_CONSTANT_Float: { | |
1707 jfloat val = float_at(idx); | |
1708 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1709 break; | |
1710 } | |
1711 case JVM_CONSTANT_Long: { | |
1712 jlong val = long_at(idx); | |
1713 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1714 idx++; // Long takes two cpool slots | |
1715 break; | |
1716 } | |
1717 case JVM_CONSTANT_Double: { | |
1718 jdouble val = double_at(idx); | |
1719 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1720 idx++; // Double takes two cpool slots | |
1721 break; | |
1722 } | |
1723 case JVM_CONSTANT_Class: | |
1724 case JVM_CONSTANT_UnresolvedClass: | |
1725 case JVM_CONSTANT_UnresolvedClassInError: { | |
1726 *bytes = JVM_CONSTANT_Class; | |
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1727 Symbol* sym = klass_name_at(idx); |
0 | 1728 idx1 = tbl->symbol_to_value(sym); |
1729 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1730 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1731 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); | |
1732 break; | |
1733 } | |
1734 case JVM_CONSTANT_String: { | |
1735 *bytes = JVM_CONSTANT_String; | |
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1736 Symbol* sym = unresolved_string_at(idx); |
0 | 1737 idx1 = tbl->symbol_to_value(sym); |
1738 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1739 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
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1740 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); |
0 | 1741 break; |
1742 } | |
1743 case JVM_CONSTANT_Fieldref: | |
1744 case JVM_CONSTANT_Methodref: | |
1745 case JVM_CONSTANT_InterfaceMethodref: { | |
1746 idx1 = uncached_klass_ref_index_at(idx); | |
1747 idx2 = uncached_name_and_type_ref_index_at(idx); | |
1748 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1749 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1750 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); | |
1751 break; | |
1752 } | |
1753 case JVM_CONSTANT_NameAndType: { | |
1754 idx1 = name_ref_index_at(idx); | |
1755 idx2 = signature_ref_index_at(idx); | |
1756 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1757 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1758 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); | |
1759 break; | |
1760 } | |
1761 case JVM_CONSTANT_ClassIndex: { | |
1762 *bytes = JVM_CONSTANT_Class; | |
1763 idx1 = klass_index_at(idx); | |
1764 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1765 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); | |
1766 break; | |
1767 } | |
1768 case JVM_CONSTANT_StringIndex: { | |
1769 *bytes = JVM_CONSTANT_String; | |
1770 idx1 = string_index_at(idx); | |
1771 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1772 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); | |
1773 break; | |
1774 } | |
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1775 case JVM_CONSTANT_MethodHandle: |
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1776 case JVM_CONSTANT_MethodHandleInError: { |
1602 | 1777 *bytes = JVM_CONSTANT_MethodHandle; |
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1778 int kind = method_handle_ref_kind_at_error_ok(idx); |
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1779 idx1 = method_handle_index_at_error_ok(idx); |
1602 | 1780 *(bytes+1) = (unsigned char) kind; |
1781 Bytes::put_Java_u2((address) (bytes+2), idx1); | |
1782 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); | |
1783 break; | |
1784 } | |
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1785 case JVM_CONSTANT_MethodType: |
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1786 case JVM_CONSTANT_MethodTypeInError: { |
1602 | 1787 *bytes = JVM_CONSTANT_MethodType; |
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1788 idx1 = method_type_index_at_error_ok(idx); |
1602 | 1789 Bytes::put_Java_u2((address) (bytes+1), idx1); |
1790 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); | |
1791 break; | |
1792 } | |
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1793 case JVM_CONSTANT_InvokeDynamic: { |
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1794 *bytes = tag; |
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1795 idx1 = extract_low_short_from_int(*int_at_addr(idx)); |
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1796 idx2 = extract_high_short_from_int(*int_at_addr(idx)); |
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1797 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); |
1660
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1798 Bytes::put_Java_u2((address) (bytes+1), idx1); |
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1799 Bytes::put_Java_u2((address) (bytes+3), idx2); |
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1800 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); |
1660
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1801 break; |
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1802 } |
0 | 1803 } |
1804 DBG(printf("\n")); | |
1805 bytes += ent_size; | |
1806 size += ent_size; | |
1807 } | |
1808 assert(size == cpool_size, "Size mismatch"); | |
1809 | |
1810 // Keep temorarily for debugging until it's stable. | |
1811 DBG(print_cpool_bytes(cnt, start_bytes)); | |
1812 return (int)(bytes - start_bytes); | |
1813 } /* end copy_cpool_bytes */ | |
1814 | |
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1815 #undef DBG |
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1816 |
0 | 1817 |
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1818 void ConstantPool::set_on_stack(const bool value) { |
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1819 if (value) { |
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1820 _flags |= _on_stack; |
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1821 } else { |
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1822 _flags &= ~_on_stack; |
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1823 } |
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1824 if (value) MetadataOnStackMark::record(this); |
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1825 } |
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1826 |
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1827 // JSR 292 support for patching constant pool oops after the class is linked and |
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1828 // the oop array for resolved references are created. |
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1829 // We can't do this during classfile parsing, which is how the other indexes are |
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1830 // patched. The other patches are applied early for some error checking |
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1831 // so only defer the pseudo_strings. |
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1832 void ConstantPool::patch_resolved_references( |
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1833 GrowableArray<Handle>* cp_patches) { |
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1834 assert(EnableInvokeDynamic, ""); |
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1835 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused |
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1836 Handle patch = cp_patches->at(index); |
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1837 if (patch.not_null()) { |
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1838 assert (tag_at(index).is_string(), "should only be string left"); |
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1839 // Patching a string means pre-resolving it. |
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1840 // The spelling in the constant pool is ignored. |
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1841 // The constant reference may be any object whatever. |
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1842 // If it is not a real interned string, the constant is referred |
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1843 // to as a "pseudo-string", and must be presented to the CP |
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1844 // explicitly, because it may require scavenging. |
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1845 int obj_index = cp_to_object_index(index); |
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1846 pseudo_string_at_put(index, obj_index, patch()); |
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1847 DEBUG_ONLY(cp_patches->at_put(index, Handle());) |
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1848 } |
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1849 } |
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1850 #ifdef ASSERT |
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1851 // Ensure that all the patches have been used. |
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1852 for (int index = 0; index < cp_patches->length(); index++) { |
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1853 assert(cp_patches->at(index).is_null(), |
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1854 err_msg("Unused constant pool patch at %d in class file %s", |
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1855 index, |
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1856 pool_holder()->external_name())); |
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1857 } |
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1858 #endif // ASSERT |
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1859 } |
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1860 |
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1861 #ifndef PRODUCT |
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1862 |
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1863 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool |
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1864 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { |
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1865 guarantee(obj->is_constantPool(), "object must be constant pool"); |
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1866 constantPoolHandle cp(THREAD, (ConstantPool*)obj); |
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1867 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); |
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1868 |
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1869 for (int i = 0; i< cp->length(); i++) { |
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1870 if (cp->tag_at(i).is_unresolved_klass()) { |
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1871 // This will force loading of the class |
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1872 Klass* klass = cp->klass_at(i, CHECK); |
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1873 if (klass->oop_is_instance()) { |
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1874 // Force initialization of class |
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1875 InstanceKlass::cast(klass)->initialize(CHECK); |
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1876 } |
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1877 } |
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1878 } |
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1879 } |
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1880 |
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1881 #endif |
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1882 |
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1883 |
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1884 // Printing |
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1885 |
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1886 void ConstantPool::print_on(outputStream* st) const { |
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1887 EXCEPTION_MARK; |
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1888 assert(is_constantPool(), "must be constantPool"); |
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1889 st->print_cr("%s", internal_name()); |
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1890 if (flags() != 0) { |
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1891 st->print(" - flags: 0x%x", flags()); |
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1892 if (has_preresolution()) st->print(" has_preresolution"); |
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1893 if (on_stack()) st->print(" on_stack"); |
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1894 st->cr(); |
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1895 } |
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1896 if (pool_holder() != NULL) { |
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1897 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder()); |
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1898 } |
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1899 st->print_cr(" - cache: " INTPTR_FORMAT, cache()); |
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1900 st->print_cr(" - resolved_references: " INTPTR_FORMAT, (void *)resolved_references()); |
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1901 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map()); |
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1902 |
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1903 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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1904 ((ConstantPool*)this)->print_entry_on(index, st); |
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1905 switch (tag_at(index).value()) { |
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1906 case JVM_CONSTANT_Long : |
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1907 case JVM_CONSTANT_Double : |
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1908 index++; // Skip entry following eigth-byte constant |
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1909 } |
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1910 |
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1911 } |
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1912 st->cr(); |
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1913 } |
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1914 |
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1915 // Print one constant pool entry |
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1916 void ConstantPool::print_entry_on(const int index, outputStream* st) { |
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1917 EXCEPTION_MARK; |
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1918 st->print(" - %3d : ", index); |
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1919 tag_at(index).print_on(st); |
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1920 st->print(" : "); |
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1921 switch (tag_at(index).value()) { |
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1922 case JVM_CONSTANT_Class : |
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1923 { Klass* k = klass_at(index, CATCH); |
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1924 guarantee(k != NULL, "need klass"); |
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1925 k->print_value_on(st); |
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1926 st->print(" {0x%lx}", (address)k); |
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1927 } |
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1928 break; |
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1929 case JVM_CONSTANT_Fieldref : |
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1930 case JVM_CONSTANT_Methodref : |
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1931 case JVM_CONSTANT_InterfaceMethodref : |
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1932 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); |
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1933 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); |
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1934 break; |
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1935 case JVM_CONSTANT_String : |
8104 | 1936 if (is_pseudo_string_at(index)) { |
1937 oop anObj = pseudo_string_at(index); | |
1938 anObj->print_value_on(st); | |
1939 st->print(" {0x%lx}", (address)anObj); | |
1940 } else { | |
1941 unresolved_string_at(index)->print_value_on(st); | |
1942 } | |
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1943 break; |
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1944 case JVM_CONSTANT_Integer : |
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1945 st->print("%d", int_at(index)); |
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1946 break; |
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1947 case JVM_CONSTANT_Float : |
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1948 st->print("%f", float_at(index)); |
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1949 break; |
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1950 case JVM_CONSTANT_Long : |
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1951 st->print_jlong(long_at(index)); |
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1952 break; |
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1953 case JVM_CONSTANT_Double : |
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1954 st->print("%lf", double_at(index)); |
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1955 break; |
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1956 case JVM_CONSTANT_NameAndType : |
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1957 st->print("name_index=%d", name_ref_index_at(index)); |
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1958 st->print(" signature_index=%d", signature_ref_index_at(index)); |
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1959 break; |
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1960 case JVM_CONSTANT_Utf8 : |
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1961 symbol_at(index)->print_value_on(st); |
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1962 break; |
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1963 case JVM_CONSTANT_UnresolvedClass : // fall-through |
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1964 case JVM_CONSTANT_UnresolvedClassInError: { |
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1965 // unresolved_klass_at requires lock or safe world. |
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1966 CPSlot entry = slot_at(index); |
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1967 if (entry.is_resolved()) { |
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1968 entry.get_klass()->print_value_on(st); |
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1969 } else { |
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1970 entry.get_symbol()->print_value_on(st); |
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1971 } |
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1972 } |
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1973 break; |
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1974 case JVM_CONSTANT_MethodHandle : |
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1975 case JVM_CONSTANT_MethodHandleInError : |
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1976 st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index)); |
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1977 st->print(" ref_index=%d", method_handle_index_at_error_ok(index)); |
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1978 break; |
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1979 case JVM_CONSTANT_MethodType : |
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1980 case JVM_CONSTANT_MethodTypeInError : |
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1981 st->print("signature_index=%d", method_type_index_at_error_ok(index)); |
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1982 break; |
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1983 case JVM_CONSTANT_InvokeDynamic : |
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1984 { |
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1985 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); |
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1986 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); |
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1987 int argc = invoke_dynamic_argument_count_at(index); |
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1988 if (argc > 0) { |
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1989 for (int arg_i = 0; arg_i < argc; arg_i++) { |
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1990 int arg = invoke_dynamic_argument_index_at(index, arg_i); |
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1991 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); |
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1992 } |
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1993 st->print("}"); |
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1994 } |
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1995 } |
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1996 break; |
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1997 default: |
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1998 ShouldNotReachHere(); |
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1999 break; |
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2000 } |
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2001 st->cr(); |
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2002 } |
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2003 |
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2004 void ConstantPool::print_value_on(outputStream* st) const { |
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2005 assert(is_constantPool(), "must be constantPool"); |
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2006 st->print("constant pool [%d]", length()); |
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2007 if (has_preresolution()) st->print("/preresolution"); |
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2008 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); |
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2009 print_address_on(st); |
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2010 st->print(" for "); |
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2011 pool_holder()->print_value_on(st); |
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2012 if (pool_holder() != NULL) { |
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2013 bool extra = (pool_holder()->constants() != this); |
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2014 if (extra) st->print(" (extra)"); |
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2015 } |
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2016 if (cache() != NULL) { |
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2017 st->print(" cache=" PTR_FORMAT, cache()); |
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2018 } |
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2019 } |
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2020 |
7956 | 2021 #if INCLUDE_SERVICES |
2022 // Size Statistics | |
2023 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { | |
2024 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); | |
2025 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); | |
2026 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); | |
2027 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); | |
2028 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); | |
2029 | |
2030 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + | |
2031 sz->_cp_refmap_bytes; | |
2032 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; | |
2033 } | |
2034 #endif // INCLUDE_SERVICES | |
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2035 |
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2036 // Verification |
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2037 |
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2038 void ConstantPool::verify_on(outputStream* st) { |
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2039 guarantee(is_constantPool(), "object must be constant pool"); |
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2040 for (int i = 0; i< length(); i++) { |
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2041 constantTag tag = tag_at(i); |
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2042 CPSlot entry = slot_at(i); |
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2043 if (tag.is_klass()) { |
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2044 if (entry.is_resolved()) { |
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2045 guarantee(entry.get_klass()->is_klass(), "should be klass"); |
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2046 } |
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2047 } else if (tag.is_unresolved_klass()) { |
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2048 if (entry.is_resolved()) { |
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2049 guarantee(entry.get_klass()->is_klass(), "should be klass"); |
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2050 } |
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2051 } else if (tag.is_symbol()) { |
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2052 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
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2053 } else if (tag.is_string()) { |
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2054 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
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2055 } |
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2056 } |
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2057 if (cache() != NULL) { |
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2058 // Note: cache() can be NULL before a class is completely setup or |
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2059 // in temporary constant pools used during constant pool merging |
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2060 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); |
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2061 } |
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2062 if (pool_holder() != NULL) { |
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2063 // Note: pool_holder() can be NULL in temporary constant pools |
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2064 // used during constant pool merging |
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2065 guarantee(pool_holder()->is_klass(), "should be klass"); |
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2066 } |
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2067 } |
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2068 |
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2069 |
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2070 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { |
0 | 2071 char *str = sym->as_utf8(); |
2072 unsigned int hash = compute_hash(str, sym->utf8_length()); | |
2073 unsigned int index = hash % table_size(); | |
2074 | |
2075 // check if already in map | |
2076 // we prefer the first entry since it is more likely to be what was used in | |
2077 // the class file | |
2078 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2079 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2080 if (en->hash() == hash && en->symbol() == sym) { | |
2081 return; // already there | |
2082 } | |
2083 } | |
2084 | |
2085 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); | |
2086 entry->set_next(bucket(index)); | |
2087 _buckets[index].set_entry(entry); | |
2088 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2089 } | |
2090 | |
2177
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changeset
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2091 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { |
0 | 2092 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); |
2093 char *str = sym->as_utf8(); | |
2094 int len = sym->utf8_length(); | |
2095 unsigned int hash = SymbolHashMap::compute_hash(str, len); | |
2096 unsigned int index = hash % table_size(); | |
2097 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2098 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2099 if (en->hash() == hash && en->symbol() == sym) { | |
2100 return en; | |
2101 } | |
2102 } | |
2103 return NULL; | |
2104 } |