Mercurial > hg > truffle
annotate src/share/vm/oops/constantPool.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author | coleenp |
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date | Sat, 01 Sep 2012 13:25:18 -0400 |
parents | src/share/vm/oops/constantPoolOop.cpp@1d7922586cf6 |
children | fa6e618671d7 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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" |
28 #include "classfile/symbolTable.hpp" | |
29 #include "classfile/systemDictionary.hpp" | |
30 #include "classfile/vmSymbols.hpp" | |
31 #include "interpreter/linkResolver.hpp" | |
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32 #include "memory/metadataFactory.hpp" |
1972 | 33 #include "memory/oopFactory.hpp" |
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34 #include "oops/constantPool.hpp" |
1972 | 35 #include "oops/instanceKlass.hpp" |
36 #include "oops/objArrayKlass.hpp" | |
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37 #include "prims/jvmtiRedefineClasses.hpp" |
1972 | 38 #include "runtime/fieldType.hpp" |
39 #include "runtime/init.hpp" | |
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40 #include "runtime/javaCalls.hpp" |
1972 | 41 #include "runtime/signature.hpp" |
42 #include "runtime/vframe.hpp" | |
0 | 43 |
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44 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { |
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45 // Tags are RW but comment below applies to tags also. |
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46 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); |
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47 |
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48 int size = ConstantPool::size(length); |
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49 |
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50 // CDS considerations: |
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51 // Allocate read-write but may be able to move to read-only at dumping time |
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52 // if all the klasses are resolved. The only other field that is writable is |
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53 // the resolved_references array, which is recreated at startup time. |
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54 // But that could be moved to InstanceKlass (although a pain to access from |
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55 // assembly code). Maybe it could be moved to the cpCache which is RW. |
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56 return new (loader_data, size, false, THREAD) ConstantPool(tags); |
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57 } |
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58 |
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59 ConstantPool::ConstantPool(Array<u1>* tags) { |
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60 set_length(tags->length()); |
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61 set_tags(NULL); |
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62 set_cache(NULL); |
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63 set_reference_map(NULL); |
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64 set_resolved_references(NULL); |
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65 set_operands(NULL); |
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66 set_pool_holder(NULL); |
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67 set_flags(0); |
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68 // only set to non-zero if constant pool is merged by RedefineClasses |
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69 set_orig_length(0); |
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70 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock")); |
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71 // all fields are initialized; needed for GC |
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72 set_on_stack(false); |
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73 |
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74 // initialize tag array |
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75 int length = tags->length(); |
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76 for (int index = 0; index < length; index++) { |
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77 tags->at_put(index, JVM_CONSTANT_Invalid); |
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78 } |
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79 set_tags(tags); |
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80 } |
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81 |
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82 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { |
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83 MetadataFactory::free_metadata(loader_data, cache()); |
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84 set_cache(NULL); |
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85 MetadataFactory::free_array<jushort>(loader_data, operands()); |
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86 set_operands(NULL); |
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87 |
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88 release_C_heap_structures(); |
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89 |
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90 // free tag array |
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91 MetadataFactory::free_array<u1>(loader_data, tags()); |
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92 set_tags(NULL); |
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93 } |
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94 |
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95 void ConstantPool::release_C_heap_structures() { |
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96 // walk constant pool and decrement symbol reference counts |
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97 unreference_symbols(); |
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98 |
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99 delete _lock; |
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100 set_lock(NULL); |
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101 } |
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102 |
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103 void ConstantPool::set_flag_at(FlagBit fb) { |
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104 const int MAX_STATE_CHANGES = 2; |
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105 for (int i = MAX_STATE_CHANGES + 10; i > 0; i--) { |
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106 int oflags = _flags; |
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107 int nflags = oflags | (1 << (int)fb); |
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108 if (Atomic::cmpxchg(nflags, &_flags, oflags) == oflags) |
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109 return; |
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110 } |
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111 assert(false, "failed to cmpxchg flags"); |
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112 _flags |= (1 << (int)fb); // better than nothing |
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113 } |
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114 |
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115 objArrayOop ConstantPool::resolved_references() const { |
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116 return (objArrayOop)JNIHandles::resolve(_resolved_references); |
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117 } |
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118 |
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119 // Create resolved_references array and mapping array for original cp indexes |
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120 // The ldc bytecode was rewritten to have the resolved reference array index so need a way |
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121 // to map it back for resolving and some unlikely miscellaneous uses. |
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122 // The objects created by invokedynamic are appended to this list. |
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123 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, |
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124 intStack reference_map, |
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125 int constant_pool_map_length, |
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126 TRAPS) { |
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127 // Initialized the resolved object cache. |
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128 int map_length = reference_map.length(); |
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129 if (map_length > 0) { |
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130 // Only need mapping back to constant pool entries. The map isn't used for |
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131 // invokedynamic resolved_reference entries. The constant pool cache index |
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132 // has the mapping back to both the constant pool and to the resolved |
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133 // reference index. |
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134 if (constant_pool_map_length > 0) { |
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135 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, map_length, CHECK); |
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136 |
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137 for (int i = 0; i < constant_pool_map_length; i++) { |
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138 int x = reference_map.at(i); |
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139 assert(x == (int)(jushort) x, "klass index is too big"); |
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140 om->at_put(i, (jushort)x); |
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141 } |
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142 set_reference_map(om); |
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143 } |
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144 |
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145 // Create Java array for holding resolved strings, methodHandles, |
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146 // methodTypes, invokedynamic and invokehandle appendix objects, etc. |
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147 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); |
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148 Handle refs_handle (THREAD, (oop)stom); // must handleize. |
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149 set_resolved_references(loader_data->add_handle(refs_handle)); |
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150 } |
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151 } |
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152 |
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153 // CDS support. Create a new resolved_references array. |
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154 void ConstantPool::restore_unshareable_info(TRAPS) { |
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155 if (SystemDictionary::Object_klass_loaded()) { |
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156 // Recreate the object array and add to ClassLoaderData. |
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157 int map_length = resolved_reference_length(); |
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158 if (map_length > 0) { |
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159 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); |
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160 Handle refs_handle (THREAD, (oop)stom); // must handleize. |
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161 |
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162 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
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163 set_resolved_references(loader_data->add_handle(refs_handle)); |
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164 } |
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165 |
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166 // Also need to recreate the mutex. Make sure this matches the constructor |
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167 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock")); |
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168 } |
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169 } |
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170 |
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171 void ConstantPool::remove_unshareable_info() { |
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172 // Resolved references are not in the shared archive. |
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173 // Save the length for restoration. It is not necessarily the same length |
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174 // as reference_map.length() if invokedynamic is saved. |
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175 set_resolved_reference_length( |
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176 resolved_references() != NULL ? resolved_references()->length() : 0); |
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177 set_resolved_references(NULL); |
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178 set_lock(NULL); |
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179 } |
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180 |
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181 int ConstantPool::cp_to_object_index(int cp_index) { |
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182 // this is harder don't do this so much. |
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183 for (int i = 0; i< reference_map()->length(); i++) { |
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184 if (reference_map()->at(i) == cp_index) return i; |
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185 // Zero entry is divider between constant pool indices for strings, |
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186 // method handles and method types. After that the index is a constant |
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187 // pool cache index for invokedynamic. Stop when zero (which can never |
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188 // be a constant pool index) |
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189 if (reference_map()->at(i) == 0) break; |
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190 } |
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191 // We might not find the index. |
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192 return _no_index_sentinel; |
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193 } |
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194 |
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195 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) { |
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196 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
0 | 197 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and |
198 // tag is not updated atomicly. | |
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199 |
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200 CPSlot entry = this_oop->slot_at(which); |
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201 if (entry.is_resolved()) { |
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202 assert(entry.get_klass()->is_klass(), "must be"); |
0 | 203 // Already resolved - return entry. |
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204 return entry.get_klass(); |
0 | 205 } |
206 | |
207 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object | |
208 // already has updated the object | |
209 assert(THREAD->is_Java_thread(), "must be a Java thread"); | |
210 bool do_resolve = false; | |
211 bool in_error = false; | |
212 | |
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213 // Create a handle for the mirror. This will preserve the resolved class |
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214 // until the loader_data is registered. |
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215 Handle mirror_handle; |
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216 |
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217 Symbol* name = NULL; |
0 | 218 Handle loader; |
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219 { MonitorLockerEx ml(this_oop->lock()); |
0 | 220 |
221 if (this_oop->tag_at(which).is_unresolved_klass()) { | |
222 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
223 in_error = true; | |
224 } else { | |
225 do_resolve = true; | |
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226 name = this_oop->unresolved_klass_at(which); |
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227 loader = Handle(THREAD, InstanceKlass::cast(this_oop->pool_holder())->class_loader()); |
0 | 228 } |
229 } | |
230 } // unlocking constantPool | |
231 | |
232 | |
233 // The original attempt to resolve this constant pool entry failed so find the | |
234 // original error and throw it again (JVMS 5.4.3). | |
235 if (in_error) { | |
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236 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which); |
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237 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); |
0 | 238 ResourceMark rm; |
239 // exception text will be the class name | |
240 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
241 THROW_MSG_0(error, className); | |
242 } | |
243 | |
244 if (do_resolve) { | |
245 // this_oop must be unlocked during resolve_or_fail | |
246 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain(); | |
247 Handle h_prot (THREAD, protection_domain); | |
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248 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD); |
0 | 249 KlassHandle k; |
250 if (!HAS_PENDING_EXCEPTION) { | |
251 k = KlassHandle(THREAD, k_oop); | |
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252 // preserve the resolved klass. |
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253 mirror_handle = Handle(THREAD, k_oop->java_mirror()); |
0 | 254 // Do access check for klasses |
255 verify_constant_pool_resolve(this_oop, k, THREAD); | |
256 } | |
257 | |
258 // Failed to resolve class. We must record the errors so that subsequent attempts | |
259 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). | |
260 if (HAS_PENDING_EXCEPTION) { | |
261 ResourceMark rm; | |
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262 Symbol* error = PENDING_EXCEPTION->klass()->name(); |
0 | 263 |
264 bool throw_orig_error = false; | |
265 { | |
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266 MonitorLockerEx ml(this_oop->lock()); |
0 | 267 |
268 // some other thread has beaten us and has resolved the class. | |
269 if (this_oop->tag_at(which).is_klass()) { | |
270 CLEAR_PENDING_EXCEPTION; | |
271 entry = this_oop->resolved_klass_at(which); | |
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272 return entry.get_klass(); |
0 | 273 } |
274 | |
275 if (!PENDING_EXCEPTION-> | |
1142 | 276 is_a(SystemDictionary::LinkageError_klass())) { |
0 | 277 // Just throw the exception and don't prevent these classes from |
278 // being loaded due to virtual machine errors like StackOverflow | |
279 // and OutOfMemoryError, etc, or if the thread was hit by stop() | |
280 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) | |
281 } | |
282 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
283 SystemDictionary::add_resolution_error(this_oop, which, error); | |
284 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError); | |
285 } else { | |
286 // some other thread has put the class in error state. | |
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287 error = SystemDictionary::find_resolution_error(this_oop, which); |
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288 assert(error != NULL, "checking"); |
0 | 289 throw_orig_error = true; |
290 } | |
291 } // unlocked | |
292 | |
293 if (throw_orig_error) { | |
294 CLEAR_PENDING_EXCEPTION; | |
295 ResourceMark rm; | |
296 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
297 THROW_MSG_0(error, className); | |
298 } | |
299 | |
300 return 0; | |
301 } | |
302 | |
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303 if (TraceClassResolution && !k()->oop_is_array()) { |
0 | 304 // skip resolving the constant pool so that this code get's |
305 // called the next time some bytecodes refer to this class. | |
306 ResourceMark rm; | |
307 int line_number = -1; | |
308 const char * source_file = NULL; | |
309 if (JavaThread::current()->has_last_Java_frame()) { | |
310 // try to identify the method which called this function. | |
311 vframeStream vfst(JavaThread::current()); | |
312 if (!vfst.at_end()) { | |
313 line_number = vfst.method()->line_number_from_bci(vfst.bci()); | |
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314 Symbol* s = InstanceKlass::cast(vfst.method()->method_holder())->source_file_name(); |
0 | 315 if (s != NULL) { |
316 source_file = s->as_C_string(); | |
317 } | |
318 } | |
319 } | |
320 if (k() != this_oop->pool_holder()) { | |
321 // only print something if the classes are different | |
322 if (source_file != NULL) { | |
323 tty->print("RESOLVE %s %s %s:%d\n", | |
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324 InstanceKlass::cast(this_oop->pool_holder())->external_name(), |
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325 InstanceKlass::cast(k())->external_name(), source_file, line_number); |
0 | 326 } else { |
327 tty->print("RESOLVE %s %s\n", | |
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328 InstanceKlass::cast(this_oop->pool_holder())->external_name(), |
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329 InstanceKlass::cast(k())->external_name()); |
0 | 330 } |
331 } | |
332 return k(); | |
333 } else { | |
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334 MonitorLockerEx ml(this_oop->lock()); |
0 | 335 // Only updated constant pool - if it is resolved. |
336 do_resolve = this_oop->tag_at(which).is_unresolved_klass(); | |
337 if (do_resolve) { | |
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338 ClassLoaderData* this_key = InstanceKlass::cast(this_oop->pool_holder())->class_loader_data(); |
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339 if (!this_key->is_the_null_class_loader_data()) { |
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340 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM |
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341 } |
0 | 342 this_oop->klass_at_put(which, k()); |
343 } | |
344 } | |
345 } | |
346 | |
347 entry = this_oop->resolved_klass_at(which); | |
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348 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); |
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349 return entry.get_klass(); |
0 | 350 } |
351 | |
352 | |
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353 // Does not update ConstantPool* - to avoid any exception throwing. Used |
0 | 354 // by compiler and exception handling. Also used to avoid classloads for |
355 // instanceof operations. Returns NULL if the class has not been loaded or | |
356 // if the verification of constant pool failed | |
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357 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) { |
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358 CPSlot entry = this_oop->slot_at(which); |
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359 if (entry.is_resolved()) { |
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360 assert(entry.get_klass()->is_klass(), "must be"); |
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361 return entry.get_klass(); |
0 | 362 } else { |
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363 assert(entry.is_unresolved(), "must be either symbol or klass"); |
0 | 364 Thread *thread = Thread::current(); |
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365 Symbol* name = entry.get_symbol(); |
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366 oop loader = InstanceKlass::cast(this_oop->pool_holder())->class_loader(); |
0 | 367 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain(); |
368 Handle h_prot (thread, protection_domain); | |
369 Handle h_loader (thread, loader); | |
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370 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); |
0 | 371 |
372 if (k != NULL) { | |
373 // Make sure that resolving is legal | |
374 EXCEPTION_MARK; | |
375 KlassHandle klass(THREAD, k); | |
376 // return NULL if verification fails | |
377 verify_constant_pool_resolve(this_oop, klass, THREAD); | |
378 if (HAS_PENDING_EXCEPTION) { | |
379 CLEAR_PENDING_EXCEPTION; | |
380 return NULL; | |
381 } | |
382 return klass(); | |
383 } else { | |
384 return k; | |
385 } | |
386 } | |
387 } | |
388 | |
389 | |
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390 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) { |
0 | 391 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which)); |
392 } | |
393 | |
394 | |
395 // This is an interface for the compiler that allows accessing non-resolved entries | |
396 // in the constant pool - but still performs the validations tests. Must be used | |
397 // in a pre-parse of the compiler - to determine what it can do and not do. | |
398 // Note: We cannot update the ConstantPool from the vm_thread. | |
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399 Klass* ConstantPool::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) { |
0 | 400 int which = this_oop->klass_ref_index_at(index); |
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401 CPSlot entry = this_oop->slot_at(which); |
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402 if (entry.is_resolved()) { |
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403 assert(entry.get_klass()->is_klass(), "must be"); |
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404 return entry.get_klass(); |
0 | 405 } else { |
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406 assert(entry.is_unresolved(), "must be either symbol or klass"); |
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407 Symbol* name = entry.get_symbol(); |
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408 oop loader = InstanceKlass::cast(this_oop->pool_holder())->class_loader(); |
0 | 409 oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain(); |
410 Handle h_loader(THREAD, loader); | |
411 Handle h_prot (THREAD, protection_domain); | |
412 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD)); | |
413 | |
414 // Do access check for klasses | |
415 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL); | |
416 return k(); | |
417 } | |
418 } | |
419 | |
420 | |
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421 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool, |
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422 int which) { |
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423 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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424 int cache_index = decode_cpcache_index(which, true); |
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425 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { |
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426 // FIXME: should be an assert |
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427 if (PrintMiscellaneous && (Verbose||WizardMode)) { |
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428 tty->print_cr("bad operand %d in:", which); cpool->print(); |
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429 } |
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430 return NULL; |
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431 } |
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432 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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433 return e->method_if_resolved(cpool); |
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434 } |
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435 |
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436 |
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437 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) { |
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438 if (cpool->cache() == NULL) return false; // nothing to load yet |
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439 int cache_index = decode_cpcache_index(which, true); |
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440 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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441 return e->has_appendix(); |
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442 } |
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443 |
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444 |
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445 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) { |
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446 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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447 int cache_index = decode_cpcache_index(which, true); |
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448 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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449 return e->appendix_if_resolved(cpool); |
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450 } |
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451 |
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452 |
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453 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { |
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454 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
0 | 455 return symbol_at(name_index); |
456 } | |
457 | |
458 | |
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459 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { |
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460 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
0 | 461 return symbol_at(signature_index); |
462 } | |
463 | |
464 | |
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465 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { |
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466 int i = which; |
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467 if (!uncached && cache() != NULL) { |
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468 if (ConstantPool::is_invokedynamic_index(which)) { |
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469 // Invokedynamic index is index into resolved_references |
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470 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); |
2460 | 471 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); |
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472 assert(tag_at(pool_index).is_name_and_type(), ""); |
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473 return pool_index; |
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474 } |
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475 // change byte-ordering and go via cache |
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476 i = remap_instruction_operand_from_cache(which); |
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477 } else { |
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478 if (tag_at(which).is_invoke_dynamic()) { |
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479 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); |
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480 assert(tag_at(pool_index).is_name_and_type(), ""); |
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481 return pool_index; |
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482 } |
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483 } |
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484 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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485 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); |
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486 jint ref_index = *int_at_addr(i); |
0 | 487 return extract_high_short_from_int(ref_index); |
488 } | |
489 | |
490 | |
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491 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { |
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492 guarantee(!ConstantPool::is_invokedynamic_index(which), |
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493 "an invokedynamic instruction does not have a klass"); |
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494 int i = which; |
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495 if (!uncached && cache() != NULL) { |
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496 // change byte-ordering and go via cache |
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497 i = remap_instruction_operand_from_cache(which); |
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498 } |
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499 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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500 jint ref_index = *int_at_addr(i); |
0 | 501 return extract_low_short_from_int(ref_index); |
502 } | |
503 | |
504 | |
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505 |
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506 int ConstantPool::remap_instruction_operand_from_cache(int operand) { |
1565 | 507 int cpc_index = operand; |
508 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); | |
509 assert((int)(u2)cpc_index == cpc_index, "clean u2"); | |
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510 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); |
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511 return member_index; |
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512 } |
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513 |
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514 |
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515 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) { |
0 | 516 if (k->oop_is_instance() || k->oop_is_objArray()) { |
517 instanceKlassHandle holder (THREAD, this_oop->pool_holder()); | |
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518 Klass* elem_oop = k->oop_is_instance() ? k() : objArrayKlass::cast(k())->bottom_klass(); |
0 | 519 KlassHandle element (THREAD, elem_oop); |
520 | |
521 // The element type could be a typeArray - we only need the access check if it is | |
522 // an reference to another class | |
523 if (element->oop_is_instance()) { | |
524 LinkResolver::check_klass_accessability(holder, element, CHECK); | |
525 } | |
526 } | |
527 } | |
528 | |
529 | |
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530 int ConstantPool::name_ref_index_at(int which_nt) { |
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531 jint ref_index = name_and_type_at(which_nt); |
0 | 532 return extract_low_short_from_int(ref_index); |
533 } | |
534 | |
535 | |
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536 int ConstantPool::signature_ref_index_at(int which_nt) { |
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537 jint ref_index = name_and_type_at(which_nt); |
0 | 538 return extract_high_short_from_int(ref_index); |
539 } | |
540 | |
541 | |
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542 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { |
0 | 543 return klass_at(klass_ref_index_at(which), CHECK_NULL); |
544 } | |
545 | |
546 | |
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547 Symbol* ConstantPool::klass_name_at(int which) { |
0 | 548 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), |
549 "Corrupted constant pool"); | |
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550 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
0 | 551 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and |
552 // tag is not updated atomicly. | |
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553 CPSlot entry = slot_at(which); |
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554 if (entry.is_resolved()) { |
0 | 555 // Already resolved - return entry's name. |
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556 assert(entry.get_klass()->is_klass(), "must be"); |
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557 return entry.get_klass()->name(); |
0 | 558 } else { |
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559 assert(entry.is_unresolved(), "must be either symbol or klass"); |
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560 return entry.get_symbol(); |
0 | 561 } |
562 } | |
563 | |
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564 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { |
0 | 565 jint ref_index = klass_ref_index_at(which); |
566 return klass_at_noresolve(ref_index); | |
567 } | |
568 | |
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569 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { |
1602 | 570 jint ref_index = uncached_klass_ref_index_at(which); |
571 return klass_at_noresolve(ref_index); | |
572 } | |
573 | |
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574 char* ConstantPool::string_at_noresolve(int which) { |
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575 Symbol* s = unresolved_string_at(which); |
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576 if (s == NULL) { |
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577 return (char*)"<pseudo-string>"; |
0 | 578 } else { |
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579 return unresolved_string_at(which)->as_C_string(); |
0 | 580 } |
581 } | |
582 | |
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583 BasicType ConstantPool::basic_type_for_signature_at(int which) { |
0 | 584 return FieldType::basic_type(symbol_at(which)); |
585 } | |
586 | |
587 | |
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588 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) { |
0 | 589 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused |
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590 if (this_oop->tag_at(index).is_string()) { |
0 | 591 this_oop->string_at(index, CHECK); |
592 } | |
593 } | |
594 } | |
595 | |
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596 // Resolve all the classes in the constant pool. If they are all resolved, |
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597 // the constant pool is read-only. Enhancement: allocate cp entries to |
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598 // another metaspace, and copy to read-only or read-write space if this |
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599 // bit is set. |
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600 bool ConstantPool::resolve_class_constants(TRAPS) { |
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601 constantPoolHandle cp(THREAD, this); |
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602 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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603 if (tag_at(index).is_unresolved_klass() && |
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604 klass_at_if_loaded(cp, index) == NULL) { |
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605 return false; |
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606 } |
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607 } |
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608 // set_preresolution(); or some bit for future use |
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609 return true; |
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610 } |
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611 |
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612 // If resolution for MethodHandle or MethodType fails, save the exception |
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613 // in the resolution error table, so that the same exception is thrown again. |
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614 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which, |
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615 int tag, TRAPS) { |
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616 ResourceMark rm; |
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617 Symbol* error = PENDING_EXCEPTION->klass()->name(); |
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618 MonitorLockerEx ml(this_oop->lock()); // lock cpool to change tag. |
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619 |
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620 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ? |
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621 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError; |
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622 |
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623 if (!PENDING_EXCEPTION-> |
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624 is_a(SystemDictionary::LinkageError_klass())) { |
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625 // Just throw the exception and don't prevent these classes from |
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626 // being loaded due to virtual machine errors like StackOverflow |
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627 // and OutOfMemoryError, etc, or if the thread was hit by stop() |
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628 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) |
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629 |
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630 } else if (this_oop->tag_at(which).value() != error_tag) { |
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631 SystemDictionary::add_resolution_error(this_oop, which, error); |
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632 this_oop->tag_at_put(which, error_tag); |
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633 } else { |
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634 // some other thread has put the class in error state. |
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635 error = SystemDictionary::find_resolution_error(this_oop, which); |
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636 assert(error != NULL, "checking"); |
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637 CLEAR_PENDING_EXCEPTION; |
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638 THROW_MSG(error, ""); |
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639 } |
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640 } |
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641 |
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642 |
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643 // Called to resolve constants in the constant pool and return an oop. |
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644 // Some constant pool entries cache their resolved oop. This is also |
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645 // called to create oops from constants to use in arguments for invokedynamic |
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646 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) { |
1602 | 647 oop result_oop = NULL; |
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648 Handle throw_exception; |
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649 |
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650 if (cache_index == _possible_index_sentinel) { |
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651 // It is possible that this constant is one which is cached in the objects. |
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652 // We'll do a linear search. This should be OK because this usage is rare. |
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653 assert(index > 0, "valid index"); |
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654 cache_index = this_oop->cp_to_object_index(index); |
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655 } |
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656 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); |
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657 assert(index == _no_index_sentinel || index >= 0, ""); |
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658 |
1602 | 659 if (cache_index >= 0) { |
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660 result_oop = this_oop->resolved_references()->obj_at(cache_index); |
1602 | 661 if (result_oop != NULL) { |
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662 return result_oop; |
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663 // That was easy... |
1602 | 664 } |
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665 index = this_oop->object_to_cp_index(cache_index); |
1602 | 666 } |
667 | |
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668 jvalue prim_value; // temp used only in a few cases below |
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669 |
1602 | 670 int tag_value = this_oop->tag_at(index).value(); |
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671 |
1602 | 672 switch (tag_value) { |
673 | |
674 case JVM_CONSTANT_UnresolvedClass: | |
675 case JVM_CONSTANT_UnresolvedClassInError: | |
676 case JVM_CONSTANT_Class: | |
677 { | |
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678 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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679 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL); |
1602 | 680 // ldc wants the java mirror. |
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681 result_oop = resolved->java_mirror(); |
1602 | 682 break; |
683 } | |
684 | |
685 case JVM_CONSTANT_String: | |
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686 assert(cache_index != _no_index_sentinel, "should have been set"); |
1602 | 687 if (this_oop->is_pseudo_string_at(index)) { |
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688 result_oop = this_oop->pseudo_string_at(index, cache_index); |
1602 | 689 break; |
690 } | |
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691 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL); |
1602 | 692 break; |
693 | |
694 case JVM_CONSTANT_Object: | |
695 result_oop = this_oop->object_at(index); | |
696 break; | |
697 | |
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698 case JVM_CONSTANT_MethodHandleInError: |
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699 case JVM_CONSTANT_MethodTypeInError: |
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700 { |
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701 Symbol* error = SystemDictionary::find_resolution_error(this_oop, index); |
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702 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); |
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703 ResourceMark rm; |
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704 THROW_MSG_0(error, ""); |
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705 break; |
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706 } |
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707 |
1602 | 708 case JVM_CONSTANT_MethodHandle: |
709 { | |
710 int ref_kind = this_oop->method_handle_ref_kind_at(index); | |
711 int callee_index = this_oop->method_handle_klass_index_at(index); | |
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712 Symbol* name = this_oop->method_handle_name_ref_at(index); |
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713 Symbol* signature = this_oop->method_handle_signature_ref_at(index); |
1602 | 714 if (PrintMiscellaneous) |
715 tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", | |
716 ref_kind, index, this_oop->method_handle_index_at(index), | |
717 callee_index, name->as_C_string(), signature->as_C_string()); | |
718 KlassHandle callee; | |
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719 { Klass* k = klass_at_impl(this_oop, callee_index, CHECK_NULL); |
1602 | 720 callee = KlassHandle(THREAD, k); |
721 } | |
722 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
723 Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, | |
724 callee, name, signature, | |
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725 THREAD); |
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726 result_oop = value(); |
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727 if (HAS_PENDING_EXCEPTION) { |
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728 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); |
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729 } |
1602 | 730 break; |
731 } | |
732 | |
733 case JVM_CONSTANT_MethodType: | |
734 { | |
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735 Symbol* signature = this_oop->method_type_signature_at(index); |
1602 | 736 if (PrintMiscellaneous) |
737 tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", | |
738 index, this_oop->method_type_index_at(index), | |
739 signature->as_C_string()); | |
740 KlassHandle klass(THREAD, this_oop->pool_holder()); | |
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741 Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); |
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742 result_oop = value(); |
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743 if (HAS_PENDING_EXCEPTION) { |
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744 save_and_throw_exception(this_oop, index, tag_value, CHECK_NULL); |
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745 } |
1602 | 746 break; |
747 } | |
748 | |
749 case JVM_CONSTANT_Integer: | |
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750 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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751 prim_value.i = this_oop->int_at(index); |
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752 result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); |
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753 break; |
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754 |
1602 | 755 case JVM_CONSTANT_Float: |
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756 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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757 prim_value.f = this_oop->float_at(index); |
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758 result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); |
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759 break; |
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760 |
1602 | 761 case JVM_CONSTANT_Long: |
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762 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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763 prim_value.j = this_oop->long_at(index); |
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764 result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); |
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765 break; |
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766 |
1602 | 767 case JVM_CONSTANT_Double: |
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768 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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769 prim_value.d = this_oop->double_at(index); |
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770 result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); |
1602 | 771 break; |
772 | |
773 default: | |
774 DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", | |
775 this_oop(), index, cache_index, tag_value) ); | |
776 assert(false, "unexpected constant tag"); | |
777 break; | |
778 } | |
779 | |
780 if (cache_index >= 0) { | |
781 // Cache the oop here also. | |
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782 Handle result_handle(THREAD, result_oop); |
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783 MonitorLockerEx ml(this_oop->lock()); // don't know if we really need this |
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784 oop result = this_oop->resolved_references()->obj_at(cache_index); |
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785 // Benign race condition: resolved_references may already be filled in while we were trying to lock. |
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786 // The important thing here is that all threads pick up the same result. |
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787 // It doesn't matter which racing thread wins, as long as only one |
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788 // result is used by all threads, and all future queries. |
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789 // That result may be either a resolved constant or a failure exception. |
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790 if (result == NULL) { |
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791 this_oop->resolved_references()->obj_at_put(cache_index, result_handle()); |
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792 return result_handle(); |
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793 } else { |
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794 // Return the winning thread's result. This can be different than |
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795 // result_handle() for MethodHandles. |
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796 return result; |
1602 | 797 } |
798 } else { | |
799 return result_oop; | |
800 } | |
801 } | |
802 | |
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803 oop ConstantPool::uncached_string_at(int which, TRAPS) { |
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804 Symbol* sym = unresolved_string_at(which); |
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805 oop str = StringTable::intern(sym, CHECK_(NULL)); |
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806 assert(java_lang_String::is_instance(str), "must be string"); |
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807 return str; |
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808 } |
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809 |
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810 |
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811 oop ConstantPool::resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS) { |
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812 assert(this_oop->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); |
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813 |
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814 Handle bsm; |
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815 int argc; |
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816 { |
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817 // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments |
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818 // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. |
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819 // It is accompanied by the optional arguments. |
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820 int bsm_index = this_oop->invoke_dynamic_bootstrap_method_ref_index_at(index); |
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821 oop bsm_oop = this_oop->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); |
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822 if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { |
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823 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); |
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824 } |
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825 |
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826 // Extract the optional static arguments. |
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827 argc = this_oop->invoke_dynamic_argument_count_at(index); |
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828 if (argc == 0) return bsm_oop; |
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829 |
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830 bsm = Handle(THREAD, bsm_oop); |
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831 } |
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832 |
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833 objArrayHandle info; |
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834 { |
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835 objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); |
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836 info = objArrayHandle(THREAD, info_oop); |
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837 } |
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838 |
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839 info->obj_at_put(0, bsm()); |
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840 for (int i = 0; i < argc; i++) { |
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841 int arg_index = this_oop->invoke_dynamic_argument_index_at(index, i); |
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842 oop arg_oop = this_oop->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); |
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843 info->obj_at_put(1+i, arg_oop); |
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844 } |
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845 |
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846 return info(); |
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847 } |
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848 |
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849 oop ConstantPool::string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS) { |
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850 // If the string has already been interned, this entry will be non-null |
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851 oop str = this_oop->resolved_references()->obj_at(obj_index); |
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852 if (str != NULL) return str; |
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853 |
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854 Symbol* sym = this_oop->unresolved_string_at(which); |
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855 str = StringTable::intern(sym, CHECK_(NULL)); |
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856 this_oop->string_at_put(which, obj_index, str); |
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857 assert(java_lang_String::is_instance(str), "must be string"); |
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858 return str; |
0 | 859 } |
860 | |
861 | |
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862 bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, |
0 | 863 int which) { |
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864 // Names are interned, so we can compare Symbol*s directly |
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865 Symbol* cp_name = klass_name_at(which); |
0 | 866 return (cp_name == k->name()); |
867 } | |
868 | |
869 | |
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870 // Iterate over symbols and decrement ones which are Symbol*s. |
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871 // This is done during GC so do not need to lock constantPool unless we |
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872 // have per-thread safepoints. |
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873 // Only decrement the UTF8 symbols. Unresolved classes and strings point to |
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874 // these symbols but didn't increment the reference count. |
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875 void ConstantPool::unreference_symbols() { |
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876 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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877 constantTag tag = tag_at(index); |
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878 if (tag.is_symbol()) { |
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879 symbol_at(index)->decrement_refcount(); |
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880 } |
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881 } |
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882 } |
0 | 883 |
884 | |
885 // Compare this constant pool's entry at index1 to the constant pool | |
886 // cp2's entry at index2. | |
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887 bool ConstantPool::compare_entry_to(int index1, constantPoolHandle cp2, |
0 | 888 int index2, TRAPS) { |
889 | |
890 jbyte t1 = tag_at(index1).value(); | |
891 jbyte t2 = cp2->tag_at(index2).value(); | |
892 | |
893 | |
894 // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass | |
895 // when comparing | |
896 if (t1 == JVM_CONSTANT_UnresolvedClassInError) { | |
897 t1 = JVM_CONSTANT_UnresolvedClass; | |
898 } | |
899 if (t2 == JVM_CONSTANT_UnresolvedClassInError) { | |
900 t2 = JVM_CONSTANT_UnresolvedClass; | |
901 } | |
902 | |
903 if (t1 != t2) { | |
904 // Not the same entry type so there is nothing else to check. Note | |
905 // that this style of checking will consider resolved/unresolved | |
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906 // class pairs as different. |
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907 // From the ConstantPool* API point of view, this is correct |
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908 // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this |
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909 // plays out in the context of ConstantPool* merging. |
0 | 910 return false; |
911 } | |
912 | |
913 switch (t1) { | |
914 case JVM_CONSTANT_Class: | |
915 { | |
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916 Klass* k1 = klass_at(index1, CHECK_false); |
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917 Klass* k2 = cp2->klass_at(index2, CHECK_false); |
0 | 918 if (k1 == k2) { |
919 return true; | |
920 } | |
921 } break; | |
922 | |
923 case JVM_CONSTANT_ClassIndex: | |
924 { | |
925 int recur1 = klass_index_at(index1); | |
926 int recur2 = cp2->klass_index_at(index2); | |
927 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
928 if (match) { | |
929 return true; | |
930 } | |
931 } break; | |
932 | |
933 case JVM_CONSTANT_Double: | |
934 { | |
935 jdouble d1 = double_at(index1); | |
936 jdouble d2 = cp2->double_at(index2); | |
937 if (d1 == d2) { | |
938 return true; | |
939 } | |
940 } break; | |
941 | |
942 case JVM_CONSTANT_Fieldref: | |
943 case JVM_CONSTANT_InterfaceMethodref: | |
944 case JVM_CONSTANT_Methodref: | |
945 { | |
946 int recur1 = uncached_klass_ref_index_at(index1); | |
947 int recur2 = cp2->uncached_klass_ref_index_at(index2); | |
948 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
949 if (match) { | |
950 recur1 = uncached_name_and_type_ref_index_at(index1); | |
951 recur2 = cp2->uncached_name_and_type_ref_index_at(index2); | |
952 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
953 if (match) { | |
954 return true; | |
955 } | |
956 } | |
957 } break; | |
958 | |
959 case JVM_CONSTANT_Float: | |
960 { | |
961 jfloat f1 = float_at(index1); | |
962 jfloat f2 = cp2->float_at(index2); | |
963 if (f1 == f2) { | |
964 return true; | |
965 } | |
966 } break; | |
967 | |
968 case JVM_CONSTANT_Integer: | |
969 { | |
970 jint i1 = int_at(index1); | |
971 jint i2 = cp2->int_at(index2); | |
972 if (i1 == i2) { | |
973 return true; | |
974 } | |
975 } break; | |
976 | |
977 case JVM_CONSTANT_Long: | |
978 { | |
979 jlong l1 = long_at(index1); | |
980 jlong l2 = cp2->long_at(index2); | |
981 if (l1 == l2) { | |
982 return true; | |
983 } | |
984 } break; | |
985 | |
986 case JVM_CONSTANT_NameAndType: | |
987 { | |
988 int recur1 = name_ref_index_at(index1); | |
989 int recur2 = cp2->name_ref_index_at(index2); | |
990 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
991 if (match) { | |
992 recur1 = signature_ref_index_at(index1); | |
993 recur2 = cp2->signature_ref_index_at(index2); | |
994 match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
995 if (match) { | |
996 return true; | |
997 } | |
998 } | |
999 } break; | |
1000 | |
1001 case JVM_CONSTANT_StringIndex: | |
1002 { | |
1003 int recur1 = string_index_at(index1); | |
1004 int recur2 = cp2->string_index_at(index2); | |
1005 bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false); | |
1006 if (match) { | |
1007 return true; | |
1008 } | |
1009 } break; | |
1010 | |
1011 case JVM_CONSTANT_UnresolvedClass: | |
1012 { | |
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1013 Symbol* k1 = unresolved_klass_at(index1); |
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1014 Symbol* k2 = cp2->unresolved_klass_at(index2); |
0 | 1015 if (k1 == k2) { |
1016 return true; | |
1017 } | |
1018 } break; | |
1019 | |
1602 | 1020 case JVM_CONSTANT_MethodType: |
1021 { | |
1022 int k1 = method_type_index_at(index1); | |
1023 int k2 = cp2->method_type_index_at(index2); | |
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1024 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1025 if (match) { |
1602 | 1026 return true; |
1027 } | |
1028 } break; | |
1029 | |
1030 case JVM_CONSTANT_MethodHandle: | |
1031 { | |
1032 int k1 = method_handle_ref_kind_at(index1); | |
1033 int k2 = cp2->method_handle_ref_kind_at(index2); | |
1034 if (k1 == k2) { | |
1035 int i1 = method_handle_index_at(index1); | |
1036 int i2 = cp2->method_handle_index_at(index2); | |
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1037 bool match = compare_entry_to(i1, cp2, i2, CHECK_false); |
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1038 if (match) { |
1602 | 1039 return true; |
1040 } | |
1041 } | |
1042 } break; | |
1043 | |
1660
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1044 case JVM_CONSTANT_InvokeDynamic: |
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1045 { |
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1046 int k1 = invoke_dynamic_bootstrap_method_ref_index_at(index1); |
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1047 int k2 = cp2->invoke_dynamic_bootstrap_method_ref_index_at(index2); |
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1048 bool match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1049 if (!match) return false; |
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1050 k1 = invoke_dynamic_name_and_type_ref_index_at(index1); |
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1051 k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); |
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1052 match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1053 if (!match) return false; |
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1054 int argc = invoke_dynamic_argument_count_at(index1); |
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1055 if (argc == cp2->invoke_dynamic_argument_count_at(index2)) { |
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1056 for (int j = 0; j < argc; j++) { |
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1057 k1 = invoke_dynamic_argument_index_at(index1, j); |
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1058 k2 = cp2->invoke_dynamic_argument_index_at(index2, j); |
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1059 match = compare_entry_to(k1, cp2, k2, CHECK_false); |
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1060 if (!match) return false; |
1913
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1061 } |
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1062 return true; // got through loop; all elements equal |
1660
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1063 } |
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1064 } break; |
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1065 |
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1066 case JVM_CONSTANT_String: |
0 | 1067 { |
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1068 Symbol* s1 = unresolved_string_at(index1); |
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1069 Symbol* s2 = cp2->unresolved_string_at(index2); |
0 | 1070 if (s1 == s2) { |
1071 return true; | |
1072 } | |
1073 } break; | |
1074 | |
1075 case JVM_CONSTANT_Utf8: | |
1076 { | |
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1077 Symbol* s1 = symbol_at(index1); |
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1078 Symbol* s2 = cp2->symbol_at(index2); |
0 | 1079 if (s1 == s2) { |
1080 return true; | |
1081 } | |
1082 } break; | |
1083 | |
1084 // Invalid is used as the tag for the second constant pool entry | |
1085 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1086 // not be seen by itself. | |
1087 case JVM_CONSTANT_Invalid: // fall through | |
1088 | |
1089 default: | |
1090 ShouldNotReachHere(); | |
1091 break; | |
1092 } | |
1093 | |
1094 return false; | |
1095 } // end compare_entry_to() | |
1096 | |
1097 | |
1098 // Copy this constant pool's entries at start_i to end_i (inclusive) | |
1099 // to the constant pool to_cp's entries starting at to_i. A total of | |
1100 // (end_i - start_i) + 1 entries are copied. | |
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1101 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, |
0 | 1102 constantPoolHandle to_cp, int to_i, TRAPS) { |
1103 | |
1104 int dest_i = to_i; // leave original alone for debug purposes | |
1105 | |
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1106 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { |
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1107 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); |
1913
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1108 |
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1109 switch (from_cp->tag_at(src_i).value()) { |
0 | 1110 case JVM_CONSTANT_Double: |
1111 case JVM_CONSTANT_Long: | |
1112 // double and long take two constant pool entries | |
1113 src_i += 2; | |
1114 dest_i += 2; | |
1115 break; | |
1116 | |
1117 default: | |
1118 // all others take one constant pool entry | |
1119 src_i++; | |
1120 dest_i++; | |
1121 break; | |
1122 } | |
1123 } | |
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1124 |
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1125 int from_oplen = operand_array_length(from_cp->operands()); |
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1126 int old_oplen = operand_array_length(to_cp->operands()); |
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1127 if (from_oplen != 0) { |
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1128 // append my operands to the target's operands array |
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1129 if (old_oplen == 0) { |
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1130 to_cp->set_operands(from_cp->operands()); // reuse; do not merge |
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1131 } else { |
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1132 int old_len = to_cp->operands()->length(); |
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1133 int from_len = from_cp->operands()->length(); |
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1134 int old_off = old_oplen * sizeof(u2); |
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1135 int from_off = from_oplen * sizeof(u2); |
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1136 // Use the metaspace for the destination constant pool |
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1137 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); |
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1138 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); |
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1139 int fillp = 0, len = 0; |
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1140 // first part of dest |
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1141 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), |
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1142 new_operands->adr_at(fillp), |
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1143 (len = old_off) * sizeof(u2)); |
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1144 fillp += len; |
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1145 // first part of src |
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1146 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), |
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1147 new_operands->adr_at(fillp), |
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1148 (len = from_off) * sizeof(u2)); |
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1149 fillp += len; |
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1150 // second part of dest |
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1151 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), |
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1152 new_operands->adr_at(fillp), |
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1153 (len = old_len - old_off) * sizeof(u2)); |
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1154 fillp += len; |
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1155 // second part of src |
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1156 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(from_off), |
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1157 new_operands->adr_at(fillp), |
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1158 (len = from_len - from_off) * sizeof(u2)); |
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1159 fillp += len; |
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1160 assert(fillp == new_operands->length(), ""); |
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1161 |
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1162 // Adjust indexes in the first part of the copied operands array. |
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1163 for (int j = 0; j < from_oplen; j++) { |
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1164 int offset = operand_offset_at(new_operands, old_oplen + j); |
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1165 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); |
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1166 offset += old_len; // every new tuple is preceded by old_len extra u2's |
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1167 operand_offset_at_put(new_operands, old_oplen + j, offset); |
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1168 } |
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1169 |
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|
1170 // replace target operands array with combined array |
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1171 to_cp->set_operands(new_operands); |
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1172 } |
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1173 } |
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1174 |
0 | 1175 } // end copy_cp_to() |
1176 | |
1177 | |
1178 // Copy this constant pool's entry at from_i to the constant pool | |
1179 // to_cp's entry at to_i. | |
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1180 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i, |
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1181 constantPoolHandle to_cp, int to_i, |
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1182 TRAPS) { |
0 | 1183 |
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1184 int tag = from_cp->tag_at(from_i).value(); |
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1185 switch (tag) { |
0 | 1186 case JVM_CONSTANT_Class: |
1187 { | |
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1188 Klass* k = from_cp->klass_at(from_i, CHECK); |
0 | 1189 to_cp->klass_at_put(to_i, k); |
1190 } break; | |
1191 | |
1192 case JVM_CONSTANT_ClassIndex: | |
1193 { | |
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1194 jint ki = from_cp->klass_index_at(from_i); |
0 | 1195 to_cp->klass_index_at_put(to_i, ki); |
1196 } break; | |
1197 | |
1198 case JVM_CONSTANT_Double: | |
1199 { | |
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1200 jdouble d = from_cp->double_at(from_i); |
0 | 1201 to_cp->double_at_put(to_i, d); |
1202 // double takes two constant pool entries so init second entry's tag | |
1203 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1204 } break; | |
1205 | |
1206 case JVM_CONSTANT_Fieldref: | |
1207 { | |
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1208 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1209 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1210 to_cp->field_at_put(to_i, class_index, name_and_type_index); |
1211 } break; | |
1212 | |
1213 case JVM_CONSTANT_Float: | |
1214 { | |
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1215 jfloat f = from_cp->float_at(from_i); |
0 | 1216 to_cp->float_at_put(to_i, f); |
1217 } break; | |
1218 | |
1219 case JVM_CONSTANT_Integer: | |
1220 { | |
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1221 jint i = from_cp->int_at(from_i); |
0 | 1222 to_cp->int_at_put(to_i, i); |
1223 } break; | |
1224 | |
1225 case JVM_CONSTANT_InterfaceMethodref: | |
1226 { | |
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1227 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1228 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1229 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); |
1230 } break; | |
1231 | |
1232 case JVM_CONSTANT_Long: | |
1233 { | |
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1234 jlong l = from_cp->long_at(from_i); |
0 | 1235 to_cp->long_at_put(to_i, l); |
1236 // long takes two constant pool entries so init second entry's tag | |
1237 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1238 } break; | |
1239 | |
1240 case JVM_CONSTANT_Methodref: | |
1241 { | |
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1242 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1243 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1244 to_cp->method_at_put(to_i, class_index, name_and_type_index); |
1245 } break; | |
1246 | |
1247 case JVM_CONSTANT_NameAndType: | |
1248 { | |
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1249 int name_ref_index = from_cp->name_ref_index_at(from_i); |
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1250 int signature_ref_index = from_cp->signature_ref_index_at(from_i); |
0 | 1251 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); |
1252 } break; | |
1253 | |
1254 case JVM_CONSTANT_StringIndex: | |
1255 { | |
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1256 jint si = from_cp->string_index_at(from_i); |
0 | 1257 to_cp->string_index_at_put(to_i, si); |
1258 } break; | |
1259 | |
1260 case JVM_CONSTANT_UnresolvedClass: | |
1261 { | |
2332
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1262 // Can be resolved after checking tag, so check the slot first. |
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1263 CPSlot entry = from_cp->slot_at(from_i); |
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1264 if (entry.is_resolved()) { |
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1265 assert(entry.get_klass()->is_klass(), "must be"); |
2332
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1266 // Already resolved |
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1267 to_cp->klass_at_put(to_i, entry.get_klass()); |
2332
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1268 } else { |
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1269 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); |
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1270 } |
0 | 1271 } break; |
1272 | |
1273 case JVM_CONSTANT_UnresolvedClassInError: | |
1274 { | |
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1275 Symbol* k = from_cp->unresolved_klass_at(from_i); |
0 | 1276 to_cp->unresolved_klass_at_put(to_i, k); |
1277 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError); | |
1278 } break; | |
1279 | |
1280 | |
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1281 case JVM_CONSTANT_String: |
0 | 1282 { |
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1283 Symbol* s = from_cp->unresolved_string_at(from_i); |
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1284 to_cp->unresolved_string_at_put(to_i, s); |
0 | 1285 } break; |
1286 | |
1287 case JVM_CONSTANT_Utf8: | |
1288 { | |
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1289 Symbol* s = from_cp->symbol_at(from_i); |
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1290 // Need to increase refcount, the old one will be thrown away and deferenced |
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1291 s->increment_refcount(); |
0 | 1292 to_cp->symbol_at_put(to_i, s); |
1293 } break; | |
1294 | |
1602 | 1295 case JVM_CONSTANT_MethodType: |
1296 { | |
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1297 jint k = from_cp->method_type_index_at(from_i); |
1602 | 1298 to_cp->method_type_index_at_put(to_i, k); |
1299 } break; | |
1300 | |
1301 case JVM_CONSTANT_MethodHandle: | |
1302 { | |
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1303 int k1 = from_cp->method_handle_ref_kind_at(from_i); |
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1304 int k2 = from_cp->method_handle_index_at(from_i); |
1602 | 1305 to_cp->method_handle_index_at_put(to_i, k1, k2); |
1306 } break; | |
1307 | |
1660
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1308 case JVM_CONSTANT_InvokeDynamic: |
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1309 { |
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1310 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); |
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1311 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); |
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1312 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands |
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1313 to_cp->invoke_dynamic_at_put(to_i, k1, k2); |
1660
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1314 } break; |
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1315 |
0 | 1316 // Invalid is used as the tag for the second constant pool entry |
1317 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1318 // not be seen by itself. | |
1319 case JVM_CONSTANT_Invalid: // fall through | |
1320 | |
1321 default: | |
1322 { | |
1323 ShouldNotReachHere(); | |
1324 } break; | |
1325 } | |
1326 } // end copy_entry_to() | |
1327 | |
1328 | |
1329 // Search constant pool search_cp for an entry that matches this | |
1330 // constant pool's entry at pattern_i. Returns the index of a | |
1331 // matching entry or zero (0) if there is no matching entry. | |
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1332 int ConstantPool::find_matching_entry(int pattern_i, |
0 | 1333 constantPoolHandle search_cp, TRAPS) { |
1334 | |
1335 // index zero (0) is not used | |
1336 for (int i = 1; i < search_cp->length(); i++) { | |
1337 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); | |
1338 if (found) { | |
1339 return i; | |
1340 } | |
1341 } | |
1342 | |
1343 return 0; // entry not found; return unused index zero (0) | |
1344 } // end find_matching_entry() | |
1345 | |
1346 | |
1347 #ifndef PRODUCT | |
1348 | |
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1349 const char* ConstantPool::printable_name_at(int which) { |
0 | 1350 |
1351 constantTag tag = tag_at(which); | |
1352 | |
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1353 if (tag.is_string()) { |
0 | 1354 return string_at_noresolve(which); |
1355 } else if (tag.is_klass() || tag.is_unresolved_klass()) { | |
1356 return klass_name_at(which)->as_C_string(); | |
1357 } else if (tag.is_symbol()) { | |
1358 return symbol_at(which)->as_C_string(); | |
1359 } | |
1360 return ""; | |
1361 } | |
1362 | |
1363 #endif // PRODUCT | |
1364 | |
1365 | |
1366 // JVMTI GetConstantPool support | |
1367 | |
1368 // For temporary use until code is stable. | |
1369 #define DBG(code) | |
1370 | |
1371 static const char* WARN_MSG = "Must not be such entry!"; | |
1372 | |
1373 static void print_cpool_bytes(jint cnt, u1 *bytes) { | |
1374 jint size = 0; | |
1375 u2 idx1, idx2; | |
1376 | |
1377 for (jint idx = 1; idx < cnt; idx++) { | |
1378 jint ent_size = 0; | |
1379 u1 tag = *bytes++; | |
1380 size++; // count tag | |
1381 | |
1382 printf("const #%03d, tag: %02d ", idx, tag); | |
1383 switch(tag) { | |
1384 case JVM_CONSTANT_Invalid: { | |
1385 printf("Invalid"); | |
1386 break; | |
1387 } | |
1388 case JVM_CONSTANT_Unicode: { | |
1389 printf("Unicode %s", WARN_MSG); | |
1390 break; | |
1391 } | |
1392 case JVM_CONSTANT_Utf8: { | |
1393 u2 len = Bytes::get_Java_u2(bytes); | |
1394 char str[128]; | |
1395 if (len > 127) { | |
1396 len = 127; | |
1397 } | |
1398 strncpy(str, (char *) (bytes+2), len); | |
1399 str[len] = '\0'; | |
1400 printf("Utf8 \"%s\"", str); | |
1401 ent_size = 2 + len; | |
1402 break; | |
1403 } | |
1404 case JVM_CONSTANT_Integer: { | |
1405 u4 val = Bytes::get_Java_u4(bytes); | |
1406 printf("int %d", *(int *) &val); | |
1407 ent_size = 4; | |
1408 break; | |
1409 } | |
1410 case JVM_CONSTANT_Float: { | |
1411 u4 val = Bytes::get_Java_u4(bytes); | |
1412 printf("float %5.3ff", *(float *) &val); | |
1413 ent_size = 4; | |
1414 break; | |
1415 } | |
1416 case JVM_CONSTANT_Long: { | |
1417 u8 val = Bytes::get_Java_u8(bytes); | |
3960 | 1418 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val); |
0 | 1419 ent_size = 8; |
1420 idx++; // Long takes two cpool slots | |
1421 break; | |
1422 } | |
1423 case JVM_CONSTANT_Double: { | |
1424 u8 val = Bytes::get_Java_u8(bytes); | |
1425 printf("double %5.3fd", *(jdouble *)&val); | |
1426 ent_size = 8; | |
1427 idx++; // Double takes two cpool slots | |
1428 break; | |
1429 } | |
1430 case JVM_CONSTANT_Class: { | |
1431 idx1 = Bytes::get_Java_u2(bytes); | |
1432 printf("class #%03d", idx1); | |
1433 ent_size = 2; | |
1434 break; | |
1435 } | |
1436 case JVM_CONSTANT_String: { | |
1437 idx1 = Bytes::get_Java_u2(bytes); | |
1438 printf("String #%03d", idx1); | |
1439 ent_size = 2; | |
1440 break; | |
1441 } | |
1442 case JVM_CONSTANT_Fieldref: { | |
1443 idx1 = Bytes::get_Java_u2(bytes); | |
1444 idx2 = Bytes::get_Java_u2(bytes+2); | |
1445 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); | |
1446 ent_size = 4; | |
1447 break; | |
1448 } | |
1449 case JVM_CONSTANT_Methodref: { | |
1450 idx1 = Bytes::get_Java_u2(bytes); | |
1451 idx2 = Bytes::get_Java_u2(bytes+2); | |
1452 printf("Method #%03d, #%03d", idx1, idx2); | |
1453 ent_size = 4; | |
1454 break; | |
1455 } | |
1456 case JVM_CONSTANT_InterfaceMethodref: { | |
1457 idx1 = Bytes::get_Java_u2(bytes); | |
1458 idx2 = Bytes::get_Java_u2(bytes+2); | |
1459 printf("InterfMethod #%03d, #%03d", idx1, idx2); | |
1460 ent_size = 4; | |
1461 break; | |
1462 } | |
1463 case JVM_CONSTANT_NameAndType: { | |
1464 idx1 = Bytes::get_Java_u2(bytes); | |
1465 idx2 = Bytes::get_Java_u2(bytes+2); | |
1466 printf("NameAndType #%03d, #%03d", idx1, idx2); | |
1467 ent_size = 4; | |
1468 break; | |
1469 } | |
1470 case JVM_CONSTANT_ClassIndex: { | |
1471 printf("ClassIndex %s", WARN_MSG); | |
1472 break; | |
1473 } | |
1474 case JVM_CONSTANT_UnresolvedClass: { | |
1475 printf("UnresolvedClass: %s", WARN_MSG); | |
1476 break; | |
1477 } | |
1478 case JVM_CONSTANT_UnresolvedClassInError: { | |
1479 printf("UnresolvedClassInErr: %s", WARN_MSG); | |
1480 break; | |
1481 } | |
1482 case JVM_CONSTANT_StringIndex: { | |
1483 printf("StringIndex: %s", WARN_MSG); | |
1484 break; | |
1485 } | |
1486 } | |
1487 printf(";\n"); | |
1488 bytes += ent_size; | |
1489 size += ent_size; | |
1490 } | |
1491 printf("Cpool size: %d\n", size); | |
1492 fflush(0); | |
1493 return; | |
1494 } /* end print_cpool_bytes */ | |
1495 | |
1496 | |
1497 // Returns size of constant pool entry. | |
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1498 jint ConstantPool::cpool_entry_size(jint idx) { |
0 | 1499 switch(tag_at(idx).value()) { |
1500 case JVM_CONSTANT_Invalid: | |
1501 case JVM_CONSTANT_Unicode: | |
1502 return 1; | |
1503 | |
1504 case JVM_CONSTANT_Utf8: | |
1505 return 3 + symbol_at(idx)->utf8_length(); | |
1506 | |
1507 case JVM_CONSTANT_Class: | |
1508 case JVM_CONSTANT_String: | |
1509 case JVM_CONSTANT_ClassIndex: | |
1510 case JVM_CONSTANT_UnresolvedClass: | |
1511 case JVM_CONSTANT_UnresolvedClassInError: | |
1512 case JVM_CONSTANT_StringIndex: | |
1602 | 1513 case JVM_CONSTANT_MethodType: |
0 | 1514 return 3; |
1515 | |
1602 | 1516 case JVM_CONSTANT_MethodHandle: |
1517 return 4; //tag, ref_kind, ref_index | |
1518 | |
0 | 1519 case JVM_CONSTANT_Integer: |
1520 case JVM_CONSTANT_Float: | |
1521 case JVM_CONSTANT_Fieldref: | |
1522 case JVM_CONSTANT_Methodref: | |
1523 case JVM_CONSTANT_InterfaceMethodref: | |
1524 case JVM_CONSTANT_NameAndType: | |
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1525 return 5; |
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1526 |
1660
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1527 case JVM_CONSTANT_InvokeDynamic: |
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1528 // u1 tag, u2 bsm, u2 nt |
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1529 return 5; |
0 | 1530 |
1531 case JVM_CONSTANT_Long: | |
1532 case JVM_CONSTANT_Double: | |
1533 return 9; | |
1534 } | |
1535 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); | |
1536 return 1; | |
1537 } /* end cpool_entry_size */ | |
1538 | |
1539 | |
1540 // SymbolHashMap is used to find a constant pool index from a string. | |
1541 // This function fills in SymbolHashMaps, one for utf8s and one for | |
1542 // class names, returns size of the cpool raw bytes. | |
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1543 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, |
0 | 1544 SymbolHashMap *classmap) { |
1545 jint size = 0; | |
1546 | |
1547 for (u2 idx = 1; idx < length(); idx++) { | |
1548 u2 tag = tag_at(idx).value(); | |
1549 size += cpool_entry_size(idx); | |
1550 | |
1551 switch(tag) { | |
1552 case JVM_CONSTANT_Utf8: { | |
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1553 Symbol* sym = symbol_at(idx); |
0 | 1554 symmap->add_entry(sym, idx); |
1555 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); | |
1556 break; | |
1557 } | |
1558 case JVM_CONSTANT_Class: | |
1559 case JVM_CONSTANT_UnresolvedClass: | |
1560 case JVM_CONSTANT_UnresolvedClassInError: { | |
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1561 Symbol* sym = klass_name_at(idx); |
0 | 1562 classmap->add_entry(sym, idx); |
1563 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); | |
1564 break; | |
1565 } | |
1566 case JVM_CONSTANT_Long: | |
1567 case JVM_CONSTANT_Double: { | |
1568 idx++; // Both Long and Double take two cpool slots | |
1569 break; | |
1570 } | |
1571 } | |
1572 } | |
1573 return size; | |
1574 } /* end hash_utf8_entries_to */ | |
1575 | |
1576 | |
1577 // Copy cpool bytes. | |
1578 // Returns: | |
1579 // 0, in case of OutOfMemoryError | |
1580 // -1, in case of internal error | |
1581 // > 0, count of the raw cpool bytes that have been copied | |
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1582 int ConstantPool::copy_cpool_bytes(int cpool_size, |
0 | 1583 SymbolHashMap* tbl, |
1584 unsigned char *bytes) { | |
1585 u2 idx1, idx2; | |
1586 jint size = 0; | |
1587 jint cnt = length(); | |
1588 unsigned char *start_bytes = bytes; | |
1589 | |
1590 for (jint idx = 1; idx < cnt; idx++) { | |
1591 u1 tag = tag_at(idx).value(); | |
1592 jint ent_size = cpool_entry_size(idx); | |
1593 | |
1594 assert(size + ent_size <= cpool_size, "Size mismatch"); | |
1595 | |
1596 *bytes = tag; | |
1597 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); | |
1598 switch(tag) { | |
1599 case JVM_CONSTANT_Invalid: { | |
1600 DBG(printf("JVM_CONSTANT_Invalid")); | |
1601 break; | |
1602 } | |
1603 case JVM_CONSTANT_Unicode: { | |
1604 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); | |
1605 DBG(printf("JVM_CONSTANT_Unicode")); | |
1606 break; | |
1607 } | |
1608 case JVM_CONSTANT_Utf8: { | |
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1609 Symbol* sym = symbol_at(idx); |
0 | 1610 char* str = sym->as_utf8(); |
1611 // Warning! It's crashing on x86 with len = sym->utf8_length() | |
1612 int len = (int) strlen(str); | |
1613 Bytes::put_Java_u2((address) (bytes+1), (u2) len); | |
1614 for (int i = 0; i < len; i++) { | |
1615 bytes[3+i] = (u1) str[i]; | |
1616 } | |
1617 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); | |
1618 break; | |
1619 } | |
1620 case JVM_CONSTANT_Integer: { | |
1621 jint val = int_at(idx); | |
1622 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1623 break; | |
1624 } | |
1625 case JVM_CONSTANT_Float: { | |
1626 jfloat val = float_at(idx); | |
1627 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1628 break; | |
1629 } | |
1630 case JVM_CONSTANT_Long: { | |
1631 jlong val = long_at(idx); | |
1632 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1633 idx++; // Long takes two cpool slots | |
1634 break; | |
1635 } | |
1636 case JVM_CONSTANT_Double: { | |
1637 jdouble val = double_at(idx); | |
1638 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1639 idx++; // Double takes two cpool slots | |
1640 break; | |
1641 } | |
1642 case JVM_CONSTANT_Class: | |
1643 case JVM_CONSTANT_UnresolvedClass: | |
1644 case JVM_CONSTANT_UnresolvedClassInError: { | |
1645 *bytes = JVM_CONSTANT_Class; | |
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1646 Symbol* sym = klass_name_at(idx); |
0 | 1647 idx1 = tbl->symbol_to_value(sym); |
1648 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1649 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1650 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); | |
1651 break; | |
1652 } | |
1653 case JVM_CONSTANT_String: { | |
1654 *bytes = JVM_CONSTANT_String; | |
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1655 Symbol* sym = unresolved_string_at(idx); |
0 | 1656 idx1 = tbl->symbol_to_value(sym); |
1657 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1658 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1659 DBG(char *str = sym->as_utf8()); | |
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1660 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str)); |
0 | 1661 break; |
1662 } | |
1663 case JVM_CONSTANT_Fieldref: | |
1664 case JVM_CONSTANT_Methodref: | |
1665 case JVM_CONSTANT_InterfaceMethodref: { | |
1666 idx1 = uncached_klass_ref_index_at(idx); | |
1667 idx2 = uncached_name_and_type_ref_index_at(idx); | |
1668 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1669 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1670 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); | |
1671 break; | |
1672 } | |
1673 case JVM_CONSTANT_NameAndType: { | |
1674 idx1 = name_ref_index_at(idx); | |
1675 idx2 = signature_ref_index_at(idx); | |
1676 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1677 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1678 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); | |
1679 break; | |
1680 } | |
1681 case JVM_CONSTANT_ClassIndex: { | |
1682 *bytes = JVM_CONSTANT_Class; | |
1683 idx1 = klass_index_at(idx); | |
1684 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1685 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); | |
1686 break; | |
1687 } | |
1688 case JVM_CONSTANT_StringIndex: { | |
1689 *bytes = JVM_CONSTANT_String; | |
1690 idx1 = string_index_at(idx); | |
1691 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1692 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); | |
1693 break; | |
1694 } | |
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1695 case JVM_CONSTANT_MethodHandle: |
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1696 case JVM_CONSTANT_MethodHandleInError: { |
1602 | 1697 *bytes = JVM_CONSTANT_MethodHandle; |
1698 int kind = method_handle_ref_kind_at(idx); | |
1699 idx1 = method_handle_index_at(idx); | |
1700 *(bytes+1) = (unsigned char) kind; | |
1701 Bytes::put_Java_u2((address) (bytes+2), idx1); | |
1702 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); | |
1703 break; | |
1704 } | |
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1705 case JVM_CONSTANT_MethodType: |
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1706 case JVM_CONSTANT_MethodTypeInError: { |
1602 | 1707 *bytes = JVM_CONSTANT_MethodType; |
1708 idx1 = method_type_index_at(idx); | |
1709 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1710 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); | |
1711 break; | |
1712 } | |
1660
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1713 case JVM_CONSTANT_InvokeDynamic: { |
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1714 *bytes = tag; |
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1715 idx1 = extract_low_short_from_int(*int_at_addr(idx)); |
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1716 idx2 = extract_high_short_from_int(*int_at_addr(idx)); |
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1717 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); |
1660
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1718 Bytes::put_Java_u2((address) (bytes+1), idx1); |
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1719 Bytes::put_Java_u2((address) (bytes+3), idx2); |
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1720 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); |
1660
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1721 break; |
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1722 } |
0 | 1723 } |
1724 DBG(printf("\n")); | |
1725 bytes += ent_size; | |
1726 size += ent_size; | |
1727 } | |
1728 assert(size == cpool_size, "Size mismatch"); | |
1729 | |
1730 // Keep temorarily for debugging until it's stable. | |
1731 DBG(print_cpool_bytes(cnt, start_bytes)); | |
1732 return (int)(bytes - start_bytes); | |
1733 } /* end copy_cpool_bytes */ | |
1734 | |
1735 | |
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1736 void ConstantPool::set_on_stack(const bool value) { |
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1737 _on_stack = value; |
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1738 if (value) MetadataOnStackMark::record(this); |
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1739 } |
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1740 |
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1741 // JSR 292 support for patching constant pool oops after the class is linked and |
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1742 // the oop array for resolved references are created. |
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1743 // We can't do this during classfile parsing, which is how the other indexes are |
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1744 // patched. The other patches are applied early for some error checking |
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1745 // so only defer the pseudo_strings. |
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1746 void ConstantPool::patch_resolved_references( |
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1747 GrowableArray<Handle>* cp_patches) { |
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1748 assert(EnableInvokeDynamic, ""); |
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1749 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused |
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1750 Handle patch = cp_patches->at(index); |
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1751 if (patch.not_null()) { |
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1752 assert (tag_at(index).is_string(), "should only be string left"); |
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1753 // Patching a string means pre-resolving it. |
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1754 // The spelling in the constant pool is ignored. |
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1755 // The constant reference may be any object whatever. |
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1756 // If it is not a real interned string, the constant is referred |
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1757 // to as a "pseudo-string", and must be presented to the CP |
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1758 // explicitly, because it may require scavenging. |
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1759 int obj_index = cp_to_object_index(index); |
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1760 pseudo_string_at_put(index, obj_index, patch()); |
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1761 DEBUG_ONLY(cp_patches->at_put(index, Handle());) |
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1762 } |
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1763 } |
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1764 #ifdef ASSERT |
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1765 // Ensure that all the patches have been used. |
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1766 for (int index = 0; index < cp_patches->length(); index++) { |
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1767 assert(cp_patches->at(index).is_null(), |
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1768 err_msg("Unused constant pool patch at %d in class file %s", |
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1769 index, |
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1770 InstanceKlass::cast(pool_holder())->external_name())); |
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1771 } |
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1772 #endif // ASSERT |
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1773 } |
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1774 |
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1775 #ifndef PRODUCT |
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1776 |
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1777 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool |
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1778 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { |
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1779 guarantee(obj->is_constantPool(), "object must be constant pool"); |
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1780 constantPoolHandle cp(THREAD, (ConstantPool*)obj); |
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1781 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); |
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1782 |
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1783 for (int i = 0; i< cp->length(); i++) { |
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1784 if (cp->tag_at(i).is_unresolved_klass()) { |
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1785 // This will force loading of the class |
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1786 Klass* klass = cp->klass_at(i, CHECK); |
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1787 if (klass->oop_is_instance()) { |
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1788 // Force initialization of class |
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1789 InstanceKlass::cast(klass)->initialize(CHECK); |
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1790 } |
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1791 } |
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1792 } |
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1793 } |
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1794 |
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1795 #endif |
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1796 |
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1797 |
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1798 // Printing |
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1799 |
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1800 void ConstantPool::print_on(outputStream* st) const { |
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1801 EXCEPTION_MARK; |
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1802 assert(is_constantPool(), "must be constantPool"); |
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1803 st->print_cr(internal_name()); |
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1804 if (flags() != 0) { |
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1805 st->print(" - flags: 0x%x", flags()); |
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1806 if (has_pseudo_string()) st->print(" has_pseudo_string"); |
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1807 if (has_invokedynamic()) st->print(" has_invokedynamic"); |
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1808 if (has_preresolution()) st->print(" has_preresolution"); |
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1809 st->cr(); |
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1810 } |
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1811 if (pool_holder() != NULL) { |
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1812 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder()); |
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1813 } |
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1814 st->print_cr(" - cache: " INTPTR_FORMAT, cache()); |
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1815 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references()); |
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1816 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map()); |
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1817 |
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1818 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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1819 ((ConstantPool*)this)->print_entry_on(index, st); |
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1820 switch (tag_at(index).value()) { |
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1821 case JVM_CONSTANT_Long : |
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1822 case JVM_CONSTANT_Double : |
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1823 index++; // Skip entry following eigth-byte constant |
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1824 } |
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1825 |
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1826 } |
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1827 st->cr(); |
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1828 } |
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1829 |
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1830 // Print one constant pool entry |
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1831 void ConstantPool::print_entry_on(const int index, outputStream* st) { |
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1832 EXCEPTION_MARK; |
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1833 st->print(" - %3d : ", index); |
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1834 tag_at(index).print_on(st); |
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1835 st->print(" : "); |
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1836 switch (tag_at(index).value()) { |
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1837 case JVM_CONSTANT_Class : |
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1838 { Klass* k = klass_at(index, CATCH); |
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1839 k->print_value_on(st); |
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1840 st->print(" {0x%lx}", (address)k); |
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1841 } |
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|
1842 break; |
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1843 case JVM_CONSTANT_Fieldref : |
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1844 case JVM_CONSTANT_Methodref : |
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1845 case JVM_CONSTANT_InterfaceMethodref : |
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1846 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); |
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1847 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); |
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1848 break; |
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|
1849 case JVM_CONSTANT_String : |
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1850 unresolved_string_at(index)->print_value_on(st); |
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1851 break; |
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1852 case JVM_CONSTANT_Object : { |
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1853 oop anObj = object_at(index); |
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1854 anObj->print_value_on(st); |
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1855 st->print(" {0x%lx}", (address)anObj); |
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1856 } break; |
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|
1857 case JVM_CONSTANT_Integer : |
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1858 st->print("%d", int_at(index)); |
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|
1859 break; |
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1860 case JVM_CONSTANT_Float : |
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1861 st->print("%f", float_at(index)); |
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|
1862 break; |
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1863 case JVM_CONSTANT_Long : |
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1864 st->print_jlong(long_at(index)); |
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|
1865 break; |
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|
1866 case JVM_CONSTANT_Double : |
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1867 st->print("%lf", double_at(index)); |
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|
1868 break; |
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|
1869 case JVM_CONSTANT_NameAndType : |
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1870 st->print("name_index=%d", name_ref_index_at(index)); |
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1871 st->print(" signature_index=%d", signature_ref_index_at(index)); |
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|
1872 break; |
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|
1873 case JVM_CONSTANT_Utf8 : |
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|
1874 symbol_at(index)->print_value_on(st); |
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|
1875 break; |
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|
1876 case JVM_CONSTANT_UnresolvedClass : // fall-through |
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1877 case JVM_CONSTANT_UnresolvedClassInError: { |
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1878 // unresolved_klass_at requires lock or safe world. |
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1879 CPSlot entry = slot_at(index); |
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1880 if (entry.is_resolved()) { |
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1881 entry.get_klass()->print_value_on(st); |
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1882 } else { |
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|
1883 entry.get_symbol()->print_value_on(st); |
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|
1884 } |
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|
1885 } |
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|
1886 break; |
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|
1887 case JVM_CONSTANT_MethodHandle : |
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1888 case JVM_CONSTANT_MethodHandleInError : |
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1889 st->print("ref_kind=%d", method_handle_ref_kind_at(index)); |
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1890 st->print(" ref_index=%d", method_handle_index_at(index)); |
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|
1891 break; |
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|
1892 case JVM_CONSTANT_MethodType : |
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1893 case JVM_CONSTANT_MethodTypeInError : |
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1894 st->print("signature_index=%d", method_type_index_at(index)); |
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|
1895 break; |
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|
1896 case JVM_CONSTANT_InvokeDynamic : |
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1897 { |
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1898 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); |
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1899 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); |
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1900 int argc = invoke_dynamic_argument_count_at(index); |
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1901 if (argc > 0) { |
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1902 for (int arg_i = 0; arg_i < argc; arg_i++) { |
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1903 int arg = invoke_dynamic_argument_index_at(index, arg_i); |
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1904 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); |
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|
1905 } |
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|
1906 st->print("}"); |
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|
1907 } |
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|
1908 } |
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|
1909 break; |
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|
1910 default: |
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|
1911 ShouldNotReachHere(); |
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1912 break; |
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1913 } |
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1914 st->cr(); |
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1915 } |
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1916 |
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1917 void ConstantPool::print_value_on(outputStream* st) const { |
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1918 assert(is_constantPool(), "must be constantPool"); |
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1919 st->print("constant pool [%d]", length()); |
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1920 if (has_pseudo_string()) st->print("/pseudo_string"); |
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1921 if (has_invokedynamic()) st->print("/invokedynamic"); |
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1922 if (has_preresolution()) st->print("/preresolution"); |
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1923 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); |
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1924 print_address_on(st); |
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1925 st->print(" for "); |
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1926 pool_holder()->print_value_on(st); |
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1927 if (pool_holder() != NULL) { |
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1928 bool extra = (InstanceKlass::cast(pool_holder())->constants() != this); |
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1929 if (extra) st->print(" (extra)"); |
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1930 } |
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1931 if (cache() != NULL) { |
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1932 st->print(" cache=" PTR_FORMAT, cache()); |
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1933 } |
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1934 } |
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1935 |
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1936 |
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1937 // Verification |
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1938 |
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1939 void ConstantPool::verify_on(outputStream* st) { |
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1940 guarantee(is_constantPool(), "object must be constant pool"); |
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1941 for (int i = 0; i< length(); i++) { |
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1942 constantTag tag = tag_at(i); |
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1943 CPSlot entry = slot_at(i); |
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1944 if (tag.is_klass()) { |
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1945 if (entry.is_resolved()) { |
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1946 guarantee(entry.get_klass()->is_metadata(), "should be metadata"); |
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1947 guarantee(entry.get_klass()->is_klass(), "should be klass"); |
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1948 } |
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1949 } else if (tag.is_unresolved_klass()) { |
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1950 if (entry.is_resolved()) { |
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1951 guarantee(entry.get_klass()->is_metadata(), "should be metadata"); |
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1952 guarantee(entry.get_klass()->is_klass(), "should be klass"); |
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1953 } |
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1954 } else if (tag.is_symbol()) { |
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1955 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
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1956 } else if (tag.is_string()) { |
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1957 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
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1958 } |
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1959 } |
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1960 if (cache() != NULL) { |
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1961 // Note: cache() can be NULL before a class is completely setup or |
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1962 // in temporary constant pools used during constant pool merging |
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1963 guarantee(cache()->is_metadata(), "should be metadata"); |
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1964 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); |
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1965 } |
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1966 if (pool_holder() != NULL) { |
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1967 // Note: pool_holder() can be NULL in temporary constant pools |
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1968 // used during constant pool merging |
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1969 guarantee(pool_holder()->is_metadata(), "should be metadata"); |
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1970 guarantee(pool_holder()->is_klass(), "should be klass"); |
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1971 } |
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1972 } |
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1973 |
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1974 |
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1975 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { |
0 | 1976 char *str = sym->as_utf8(); |
1977 unsigned int hash = compute_hash(str, sym->utf8_length()); | |
1978 unsigned int index = hash % table_size(); | |
1979 | |
1980 // check if already in map | |
1981 // we prefer the first entry since it is more likely to be what was used in | |
1982 // the class file | |
1983 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
1984 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
1985 if (en->hash() == hash && en->symbol() == sym) { | |
1986 return; // already there | |
1987 } | |
1988 } | |
1989 | |
1990 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); | |
1991 entry->set_next(bucket(index)); | |
1992 _buckets[index].set_entry(entry); | |
1993 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
1994 } | |
1995 | |
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1996 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { |
0 | 1997 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); |
1998 char *str = sym->as_utf8(); | |
1999 int len = sym->utf8_length(); | |
2000 unsigned int hash = SymbolHashMap::compute_hash(str, len); | |
2001 unsigned int index = hash % table_size(); | |
2002 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2003 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2004 if (en->hash() == hash && en->symbol() == sym) { | |
2005 return en; | |
2006 } | |
2007 } | |
2008 return NULL; | |
2009 } |