Mercurial > hg > truffle
annotate src/share/vm/oops/constantPool.cpp @ 9126:bc26f978b0ce
HotSpotResolvedObjectType: implement hasFinalizeSubclass() correctly
don't use the (wrong) cached value, but ask the runtime on each request.
Fixes regression on xml.* benchmarks @ specjvm2008. The problem was:
After the constructor of Object was deoptimized due to an assumption violation,
it was recompiled again after some time. However, on recompilation, the value
of hasFinalizeSubclass for the class was not updated and it was compiled again
with a, now wrong, assumption, which then triggers deoptimization again.
This was repeated until it hit the recompilation limit (defined by
PerMethodRecompilationCutoff), and therefore only executed by the interpreter
from now on, causing the performance regression.
author | Bernhard Urban <bernhard.urban@jku.at> |
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date | Mon, 15 Apr 2013 19:54:58 +0200 |
parents | 89e4d67fdd2a |
children | 836a62f43af9 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
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26 #include "classfile/classLoaderData.hpp" |
1972 | 27 #include "classfile/javaClasses.hpp" |
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28 #include "classfile/metadataOnStackMark.hpp" |
1972 | 29 #include "classfile/symbolTable.hpp" |
30 #include "classfile/systemDictionary.hpp" | |
31 #include "classfile/vmSymbols.hpp" | |
32 #include "interpreter/linkResolver.hpp" | |
7956 | 33 #include "memory/heapInspection.hpp" |
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34 #include "memory/metadataFactory.hpp" |
1972 | 35 #include "memory/oopFactory.hpp" |
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36 #include "oops/constantPool.hpp" |
1972 | 37 #include "oops/instanceKlass.hpp" |
38 #include "oops/objArrayKlass.hpp" | |
39 #include "runtime/fieldType.hpp" | |
40 #include "runtime/init.hpp" | |
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41 #include "runtime/javaCalls.hpp" |
1972 | 42 #include "runtime/signature.hpp" |
43 #include "runtime/vframe.hpp" | |
0 | 44 |
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45 ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { |
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46 // Tags are RW but comment below applies to tags also. |
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47 Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); |
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48 |
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49 int size = ConstantPool::size(length); |
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50 |
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51 // CDS considerations: |
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52 // Allocate read-write but may be able to move to read-only at dumping time |
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53 // if all the klasses are resolved. The only other field that is writable is |
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54 // the resolved_references array, which is recreated at startup time. |
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55 // But that could be moved to InstanceKlass (although a pain to access from |
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56 // assembly code). Maybe it could be moved to the cpCache which is RW. |
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57 return new (loader_data, size, false, THREAD) ConstantPool(tags); |
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58 } |
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59 |
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60 ConstantPool::ConstantPool(Array<u1>* tags) { |
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61 set_length(tags->length()); |
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62 set_tags(NULL); |
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63 set_cache(NULL); |
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64 set_reference_map(NULL); |
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65 set_resolved_references(NULL); |
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66 set_operands(NULL); |
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67 set_pool_holder(NULL); |
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68 set_flags(0); |
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69 |
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70 // only set to non-zero if constant pool is merged by RedefineClasses |
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71 set_version(0); |
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72 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock")); |
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73 |
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74 // initialize tag array |
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75 int length = tags->length(); |
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76 for (int index = 0; index < length; index++) { |
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77 tags->at_put(index, JVM_CONSTANT_Invalid); |
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78 } |
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79 set_tags(tags); |
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80 } |
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81 |
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82 void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { |
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83 MetadataFactory::free_metadata(loader_data, cache()); |
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84 set_cache(NULL); |
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85 MetadataFactory::free_array<jushort>(loader_data, operands()); |
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86 set_operands(NULL); |
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87 |
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88 release_C_heap_structures(); |
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89 |
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90 // free tag array |
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91 MetadataFactory::free_array<u1>(loader_data, tags()); |
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92 set_tags(NULL); |
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93 } |
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94 |
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95 void ConstantPool::release_C_heap_structures() { |
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96 // walk constant pool and decrement symbol reference counts |
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97 unreference_symbols(); |
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98 |
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99 delete _lock; |
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100 set_lock(NULL); |
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101 } |
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102 |
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103 objArrayOop ConstantPool::resolved_references() const { |
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104 return (objArrayOop)JNIHandles::resolve(_resolved_references); |
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105 } |
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106 |
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107 // Create resolved_references array and mapping array for original cp indexes |
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108 // The ldc bytecode was rewritten to have the resolved reference array index so need a way |
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109 // to map it back for resolving and some unlikely miscellaneous uses. |
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110 // The objects created by invokedynamic are appended to this list. |
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111 void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, |
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112 intStack reference_map, |
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113 int constant_pool_map_length, |
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114 TRAPS) { |
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115 // Initialized the resolved object cache. |
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116 int map_length = reference_map.length(); |
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117 if (map_length > 0) { |
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118 // Only need mapping back to constant pool entries. The map isn't used for |
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119 // invokedynamic resolved_reference entries. The constant pool cache index |
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120 // has the mapping back to both the constant pool and to the resolved |
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121 // reference index. |
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122 if (constant_pool_map_length > 0) { |
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123 Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, map_length, CHECK); |
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124 |
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125 for (int i = 0; i < constant_pool_map_length; i++) { |
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126 int x = reference_map.at(i); |
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127 assert(x == (int)(jushort) x, "klass index is too big"); |
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128 om->at_put(i, (jushort)x); |
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129 } |
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130 set_reference_map(om); |
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131 } |
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132 |
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133 // Create Java array for holding resolved strings, methodHandles, |
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134 // methodTypes, invokedynamic and invokehandle appendix objects, etc. |
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135 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); |
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136 Handle refs_handle (THREAD, (oop)stom); // must handleize. |
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137 set_resolved_references(loader_data->add_handle(refs_handle)); |
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138 } |
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139 } |
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140 |
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141 // CDS support. Create a new resolved_references array. |
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142 void ConstantPool::restore_unshareable_info(TRAPS) { |
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143 |
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144 // restore the C++ vtable from the shared archive |
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145 restore_vtable(); |
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146 |
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147 if (SystemDictionary::Object_klass_loaded()) { |
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148 // Recreate the object array and add to ClassLoaderData. |
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149 int map_length = resolved_reference_length(); |
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150 if (map_length > 0) { |
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151 objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); |
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152 Handle refs_handle (THREAD, (oop)stom); // must handleize. |
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153 |
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154 ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
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155 set_resolved_references(loader_data->add_handle(refs_handle)); |
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156 } |
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157 |
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158 // Also need to recreate the mutex. Make sure this matches the constructor |
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159 set_lock(new Monitor(Monitor::nonleaf + 2, "A constant pool lock")); |
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160 } |
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161 } |
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162 |
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163 void ConstantPool::remove_unshareable_info() { |
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164 // Resolved references are not in the shared archive. |
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165 // Save the length for restoration. It is not necessarily the same length |
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166 // as reference_map.length() if invokedynamic is saved. |
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167 set_resolved_reference_length( |
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168 resolved_references() != NULL ? resolved_references()->length() : 0); |
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169 set_resolved_references(NULL); |
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170 set_lock(NULL); |
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171 } |
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172 |
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173 int ConstantPool::cp_to_object_index(int cp_index) { |
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174 // this is harder don't do this so much. |
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175 for (int i = 0; i< reference_map()->length(); i++) { |
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176 if (reference_map()->at(i) == cp_index) return i; |
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177 // Zero entry is divider between constant pool indices for strings, |
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178 // method handles and method types. After that the index is a constant |
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179 // pool cache index for invokedynamic. Stop when zero (which can never |
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180 // be a constant pool index) |
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181 if (reference_map()->at(i) == 0) break; |
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182 } |
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183 // We might not find the index. |
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184 return _no_index_sentinel; |
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185 } |
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186 |
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187 Klass* ConstantPool::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) { |
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188 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
0 | 189 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and |
190 // tag is not updated atomicly. | |
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191 |
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192 CPSlot entry = this_oop->slot_at(which); |
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193 if (entry.is_resolved()) { |
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194 assert(entry.get_klass()->is_klass(), "must be"); |
0 | 195 // Already resolved - return entry. |
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196 return entry.get_klass(); |
0 | 197 } |
198 | |
199 // Acquire lock on constant oop while doing update. After we get the lock, we check if another object | |
200 // already has updated the object | |
201 assert(THREAD->is_Java_thread(), "must be a Java thread"); | |
202 bool do_resolve = false; | |
203 bool in_error = false; | |
204 | |
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205 // Create a handle for the mirror. This will preserve the resolved class |
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206 // until the loader_data is registered. |
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207 Handle mirror_handle; |
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208 |
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209 Symbol* name = NULL; |
0 | 210 Handle loader; |
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211 { MonitorLockerEx ml(this_oop->lock()); |
0 | 212 |
213 if (this_oop->tag_at(which).is_unresolved_klass()) { | |
214 if (this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
215 in_error = true; | |
216 } else { | |
217 do_resolve = true; | |
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218 name = this_oop->unresolved_klass_at(which); |
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219 loader = Handle(THREAD, this_oop->pool_holder()->class_loader()); |
0 | 220 } |
221 } | |
222 } // unlocking constantPool | |
223 | |
224 | |
225 // The original attempt to resolve this constant pool entry failed so find the | |
226 // original error and throw it again (JVMS 5.4.3). | |
227 if (in_error) { | |
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228 Symbol* error = SystemDictionary::find_resolution_error(this_oop, which); |
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229 guarantee(error != (Symbol*)NULL, "tag mismatch with resolution error table"); |
0 | 230 ResourceMark rm; |
231 // exception text will be the class name | |
232 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
233 THROW_MSG_0(error, className); | |
234 } | |
235 | |
236 if (do_resolve) { | |
237 // this_oop must be unlocked during resolve_or_fail | |
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238 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 239 Handle h_prot (THREAD, protection_domain); |
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240 Klass* k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD); |
0 | 241 KlassHandle k; |
242 if (!HAS_PENDING_EXCEPTION) { | |
243 k = KlassHandle(THREAD, k_oop); | |
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244 // preserve the resolved klass. |
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245 mirror_handle = Handle(THREAD, k_oop->java_mirror()); |
0 | 246 // Do access check for klasses |
247 verify_constant_pool_resolve(this_oop, k, THREAD); | |
248 } | |
249 | |
250 // Failed to resolve class. We must record the errors so that subsequent attempts | |
251 // to resolve this constant pool entry fail with the same error (JVMS 5.4.3). | |
252 if (HAS_PENDING_EXCEPTION) { | |
253 ResourceMark rm; | |
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254 Symbol* error = PENDING_EXCEPTION->klass()->name(); |
0 | 255 |
256 bool throw_orig_error = false; | |
257 { | |
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258 MonitorLockerEx ml(this_oop->lock()); |
0 | 259 |
260 // some other thread has beaten us and has resolved the class. | |
261 if (this_oop->tag_at(which).is_klass()) { | |
262 CLEAR_PENDING_EXCEPTION; | |
263 entry = this_oop->resolved_klass_at(which); | |
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264 return entry.get_klass(); |
0 | 265 } |
266 | |
267 if (!PENDING_EXCEPTION-> | |
1142 | 268 is_a(SystemDictionary::LinkageError_klass())) { |
0 | 269 // Just throw the exception and don't prevent these classes from |
270 // being loaded due to virtual machine errors like StackOverflow | |
271 // and OutOfMemoryError, etc, or if the thread was hit by stop() | |
272 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) | |
273 } | |
274 else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) { | |
275 SystemDictionary::add_resolution_error(this_oop, which, error); | |
276 this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError); | |
277 } else { | |
278 // some other thread has put the class in error state. | |
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279 error = SystemDictionary::find_resolution_error(this_oop, which); |
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280 assert(error != NULL, "checking"); |
0 | 281 throw_orig_error = true; |
282 } | |
283 } // unlocked | |
284 | |
285 if (throw_orig_error) { | |
286 CLEAR_PENDING_EXCEPTION; | |
287 ResourceMark rm; | |
288 const char* className = this_oop->unresolved_klass_at(which)->as_C_string(); | |
289 THROW_MSG_0(error, className); | |
290 } | |
291 | |
292 return 0; | |
293 } | |
294 | |
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295 if (TraceClassResolution && !k()->oop_is_array()) { |
0 | 296 // skip resolving the constant pool so that this code get's |
297 // called the next time some bytecodes refer to this class. | |
298 ResourceMark rm; | |
299 int line_number = -1; | |
300 const char * source_file = NULL; | |
301 if (JavaThread::current()->has_last_Java_frame()) { | |
302 // try to identify the method which called this function. | |
303 vframeStream vfst(JavaThread::current()); | |
304 if (!vfst.at_end()) { | |
305 line_number = vfst.method()->line_number_from_bci(vfst.bci()); | |
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306 Symbol* s = vfst.method()->method_holder()->source_file_name(); |
0 | 307 if (s != NULL) { |
308 source_file = s->as_C_string(); | |
309 } | |
310 } | |
311 } | |
312 if (k() != this_oop->pool_holder()) { | |
313 // only print something if the classes are different | |
314 if (source_file != NULL) { | |
315 tty->print("RESOLVE %s %s %s:%d\n", | |
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316 this_oop->pool_holder()->external_name(), |
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317 InstanceKlass::cast(k())->external_name(), source_file, line_number); |
0 | 318 } else { |
319 tty->print("RESOLVE %s %s\n", | |
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320 this_oop->pool_holder()->external_name(), |
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321 InstanceKlass::cast(k())->external_name()); |
0 | 322 } |
323 } | |
324 return k(); | |
325 } else { | |
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326 MonitorLockerEx ml(this_oop->lock()); |
0 | 327 // Only updated constant pool - if it is resolved. |
328 do_resolve = this_oop->tag_at(which).is_unresolved_klass(); | |
329 if (do_resolve) { | |
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330 ClassLoaderData* this_key = this_oop->pool_holder()->class_loader_data(); |
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331 this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM |
0 | 332 this_oop->klass_at_put(which, k()); |
333 } | |
334 } | |
335 } | |
336 | |
337 entry = this_oop->resolved_klass_at(which); | |
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338 assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); |
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339 return entry.get_klass(); |
0 | 340 } |
341 | |
342 | |
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343 // Does not update ConstantPool* - to avoid any exception throwing. Used |
0 | 344 // by compiler and exception handling. Also used to avoid classloads for |
345 // instanceof operations. Returns NULL if the class has not been loaded or | |
346 // if the verification of constant pool failed | |
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347 Klass* ConstantPool::klass_at_if_loaded(constantPoolHandle this_oop, int which) { |
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348 CPSlot entry = this_oop->slot_at(which); |
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349 if (entry.is_resolved()) { |
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350 assert(entry.get_klass()->is_klass(), "must be"); |
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351 return entry.get_klass(); |
0 | 352 } else { |
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353 assert(entry.is_unresolved(), "must be either symbol or klass"); |
0 | 354 Thread *thread = Thread::current(); |
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355 Symbol* name = entry.get_symbol(); |
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356 oop loader = this_oop->pool_holder()->class_loader(); |
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357 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 358 Handle h_prot (thread, protection_domain); |
359 Handle h_loader (thread, loader); | |
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360 Klass* k = SystemDictionary::find(name, h_loader, h_prot, thread); |
0 | 361 |
362 if (k != NULL) { | |
363 // Make sure that resolving is legal | |
364 EXCEPTION_MARK; | |
365 KlassHandle klass(THREAD, k); | |
366 // return NULL if verification fails | |
367 verify_constant_pool_resolve(this_oop, klass, THREAD); | |
368 if (HAS_PENDING_EXCEPTION) { | |
369 CLEAR_PENDING_EXCEPTION; | |
370 return NULL; | |
371 } | |
372 return klass(); | |
373 } else { | |
374 return k; | |
375 } | |
376 } | |
377 } | |
378 | |
379 | |
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380 Klass* ConstantPool::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) { |
0 | 381 return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which)); |
382 } | |
383 | |
384 | |
385 // This is an interface for the compiler that allows accessing non-resolved entries | |
386 // in the constant pool - but still performs the validations tests. Must be used | |
387 // in a pre-parse of the compiler - to determine what it can do and not do. | |
388 // Note: We cannot update the ConstantPool from the vm_thread. | |
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389 Klass* ConstantPool::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) { |
0 | 390 int which = this_oop->klass_ref_index_at(index); |
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391 CPSlot entry = this_oop->slot_at(which); |
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392 if (entry.is_resolved()) { |
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393 assert(entry.get_klass()->is_klass(), "must be"); |
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394 return entry.get_klass(); |
0 | 395 } else { |
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396 assert(entry.is_unresolved(), "must be either symbol or klass"); |
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397 Symbol* name = entry.get_symbol(); |
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398 oop loader = this_oop->pool_holder()->class_loader(); |
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399 oop protection_domain = this_oop->pool_holder()->protection_domain(); |
0 | 400 Handle h_loader(THREAD, loader); |
401 Handle h_prot (THREAD, protection_domain); | |
402 KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD)); | |
403 | |
404 // Do access check for klasses | |
405 if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL); | |
406 return k(); | |
407 } | |
408 } | |
409 | |
410 | |
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411 Method* ConstantPool::method_at_if_loaded(constantPoolHandle cpool, |
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412 int which) { |
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413 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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414 int cache_index = decode_cpcache_index(which, true); |
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415 if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { |
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416 // FIXME: should be an assert |
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417 if (PrintMiscellaneous && (Verbose||WizardMode)) { |
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418 tty->print_cr("bad operand %d in:", which); cpool->print(); |
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419 } |
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420 return NULL; |
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421 } |
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422 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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423 return e->method_if_resolved(cpool); |
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424 } |
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425 |
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426 |
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427 bool ConstantPool::has_appendix_at_if_loaded(constantPoolHandle cpool, int which) { |
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428 if (cpool->cache() == NULL) return false; // nothing to load yet |
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429 int cache_index = decode_cpcache_index(which, true); |
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430 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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431 return e->has_appendix(); |
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432 } |
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433 |
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434 oop ConstantPool::appendix_at_if_loaded(constantPoolHandle cpool, int which) { |
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435 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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436 int cache_index = decode_cpcache_index(which, true); |
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437 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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438 return e->appendix_if_resolved(cpool); |
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439 } |
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440 |
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441 |
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442 bool ConstantPool::has_method_type_at_if_loaded(constantPoolHandle cpool, int which) { |
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443 if (cpool->cache() == NULL) return false; // nothing to load yet |
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444 int cache_index = decode_cpcache_index(which, true); |
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445 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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446 return e->has_method_type(); |
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447 } |
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448 |
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449 oop ConstantPool::method_type_at_if_loaded(constantPoolHandle cpool, int which) { |
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450 if (cpool->cache() == NULL) return NULL; // nothing to load yet |
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451 int cache_index = decode_cpcache_index(which, true); |
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452 ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
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453 return e->method_type_if_resolved(cpool); |
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454 } |
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455 |
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456 |
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457 Symbol* ConstantPool::impl_name_ref_at(int which, bool uncached) { |
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458 int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
0 | 459 return symbol_at(name_index); |
460 } | |
461 | |
462 | |
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463 Symbol* ConstantPool::impl_signature_ref_at(int which, bool uncached) { |
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464 int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
0 | 465 return symbol_at(signature_index); |
466 } | |
467 | |
468 | |
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469 int ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { |
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470 int i = which; |
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471 if (!uncached && cache() != NULL) { |
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472 if (ConstantPool::is_invokedynamic_index(which)) { |
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473 // Invokedynamic index is index into resolved_references |
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474 int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); |
2460 | 475 pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); |
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476 assert(tag_at(pool_index).is_name_and_type(), ""); |
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477 return pool_index; |
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478 } |
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479 // change byte-ordering and go via cache |
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480 i = remap_instruction_operand_from_cache(which); |
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481 } else { |
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482 if (tag_at(which).is_invoke_dynamic()) { |
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483 int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); |
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484 assert(tag_at(pool_index).is_name_and_type(), ""); |
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485 return pool_index; |
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486 } |
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487 } |
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488 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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489 assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); |
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490 jint ref_index = *int_at_addr(i); |
0 | 491 return extract_high_short_from_int(ref_index); |
492 } | |
493 | |
494 | |
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495 int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { |
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496 guarantee(!ConstantPool::is_invokedynamic_index(which), |
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497 "an invokedynamic instruction does not have a klass"); |
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498 int i = which; |
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499 if (!uncached && cache() != NULL) { |
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500 // change byte-ordering and go via cache |
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501 i = remap_instruction_operand_from_cache(which); |
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502 } |
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503 assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
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504 jint ref_index = *int_at_addr(i); |
0 | 505 return extract_low_short_from_int(ref_index); |
506 } | |
507 | |
508 | |
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509 |
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510 int ConstantPool::remap_instruction_operand_from_cache(int operand) { |
1565 | 511 int cpc_index = operand; |
512 DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); | |
513 assert((int)(u2)cpc_index == cpc_index, "clean u2"); | |
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514 int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); |
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515 return member_index; |
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516 } |
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517 |
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518 |
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519 void ConstantPool::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) { |
0 | 520 if (k->oop_is_instance() || k->oop_is_objArray()) { |
521 instanceKlassHandle holder (THREAD, this_oop->pool_holder()); | |
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522 Klass* elem_oop = k->oop_is_instance() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); |
0 | 523 KlassHandle element (THREAD, elem_oop); |
524 | |
525 // The element type could be a typeArray - we only need the access check if it is | |
526 // an reference to another class | |
527 if (element->oop_is_instance()) { | |
528 LinkResolver::check_klass_accessability(holder, element, CHECK); | |
529 } | |
530 } | |
531 } | |
532 | |
533 | |
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534 int ConstantPool::name_ref_index_at(int which_nt) { |
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535 jint ref_index = name_and_type_at(which_nt); |
0 | 536 return extract_low_short_from_int(ref_index); |
537 } | |
538 | |
539 | |
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540 int ConstantPool::signature_ref_index_at(int which_nt) { |
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541 jint ref_index = name_and_type_at(which_nt); |
0 | 542 return extract_high_short_from_int(ref_index); |
543 } | |
544 | |
545 | |
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546 Klass* ConstantPool::klass_ref_at(int which, TRAPS) { |
0 | 547 return klass_at(klass_ref_index_at(which), CHECK_NULL); |
548 } | |
549 | |
550 | |
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551 Symbol* ConstantPool::klass_name_at(int which) { |
0 | 552 assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), |
553 "Corrupted constant pool"); | |
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554 // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
0 | 555 // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and |
556 // tag is not updated atomicly. | |
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557 CPSlot entry = slot_at(which); |
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558 if (entry.is_resolved()) { |
0 | 559 // Already resolved - return entry's name. |
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560 assert(entry.get_klass()->is_klass(), "must be"); |
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561 return entry.get_klass()->name(); |
0 | 562 } else { |
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563 assert(entry.is_unresolved(), "must be either symbol or klass"); |
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564 return entry.get_symbol(); |
0 | 565 } |
566 } | |
567 | |
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568 Symbol* ConstantPool::klass_ref_at_noresolve(int which) { |
0 | 569 jint ref_index = klass_ref_index_at(which); |
570 return klass_at_noresolve(ref_index); | |
571 } | |
572 | |
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573 Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { |
1602 | 574 jint ref_index = uncached_klass_ref_index_at(which); |
575 return klass_at_noresolve(ref_index); | |
576 } | |
577 | |
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578 char* ConstantPool::string_at_noresolve(int which) { |
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579 Symbol* s = unresolved_string_at(which); |
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580 if (s == NULL) { |
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581 return (char*)"<pseudo-string>"; |
0 | 582 } else { |
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583 return unresolved_string_at(which)->as_C_string(); |
0 | 584 } |
585 } | |
586 | |
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587 BasicType ConstantPool::basic_type_for_signature_at(int which) { |
0 | 588 return FieldType::basic_type(symbol_at(which)); |
589 } | |
590 | |
591 | |
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592 void ConstantPool::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) { |
0 | 593 for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused |
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594 if (this_oop->tag_at(index).is_string()) { |
0 | 595 this_oop->string_at(index, CHECK); |
596 } | |
597 } | |
598 } | |
599 | |
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600 // Resolve all the classes in the constant pool. If they are all resolved, |
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601 // the constant pool is read-only. Enhancement: allocate cp entries to |
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602 // another metaspace, and copy to read-only or read-write space if this |
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603 // bit is set. |
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604 bool ConstantPool::resolve_class_constants(TRAPS) { |
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605 constantPoolHandle cp(THREAD, this); |
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606 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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607 if (tag_at(index).is_unresolved_klass() && |
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608 klass_at_if_loaded(cp, index) == NULL) { |
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609 return false; |
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610 } |
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611 } |
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612 // set_preresolution(); or some bit for future use |
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613 return true; |
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614 } |
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615 |
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616 // If resolution for MethodHandle or MethodType fails, save the exception |
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617 // in the resolution error table, so that the same exception is thrown again. |
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618 void ConstantPool::save_and_throw_exception(constantPoolHandle this_oop, int which, |
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619 int tag, TRAPS) { |
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620 ResourceMark rm; |
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621 Symbol* error = PENDING_EXCEPTION->klass()->name(); |
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622 MonitorLockerEx ml(this_oop->lock()); // lock cpool to change tag. |
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623 |
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624 int error_tag = (tag == JVM_CONSTANT_MethodHandle) ? |
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625 JVM_CONSTANT_MethodHandleInError : JVM_CONSTANT_MethodTypeInError; |
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626 |
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627 if (!PENDING_EXCEPTION-> |
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628 is_a(SystemDictionary::LinkageError_klass())) { |
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629 // Just throw the exception and don't prevent these classes from |
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630 // being loaded due to virtual machine errors like StackOverflow |
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631 // and OutOfMemoryError, etc, or if the thread was hit by stop() |
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632 // Needs clarification to section 5.4.3 of the VM spec (see 6308271) |
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633 |
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634 } else if (this_oop->tag_at(which).value() != error_tag) { |
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635 SystemDictionary::add_resolution_error(this_oop, which, error); |
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636 this_oop->tag_at_put(which, error_tag); |
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637 } else { |
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638 // some other thread has put the class in error state. |
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639 error = SystemDictionary::find_resolution_error(this_oop, which); |
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640 assert(error != NULL, "checking"); |
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641 CLEAR_PENDING_EXCEPTION; |
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642 THROW_MSG(error, ""); |
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643 } |
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644 } |
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645 |
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646 |
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647 // Called to resolve constants in the constant pool and return an oop. |
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648 // Some constant pool entries cache their resolved oop. This is also |
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649 // called to create oops from constants to use in arguments for invokedynamic |
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650 oop ConstantPool::resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS) { |
1602 | 651 oop result_oop = NULL; |
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652 Handle throw_exception; |
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653 |
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654 if (cache_index == _possible_index_sentinel) { |
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655 // It is possible that this constant is one which is cached in the objects. |
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656 // We'll do a linear search. This should be OK because this usage is rare. |
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657 assert(index > 0, "valid index"); |
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658 cache_index = this_oop->cp_to_object_index(index); |
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659 } |
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660 assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); |
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661 assert(index == _no_index_sentinel || index >= 0, ""); |
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662 |
1602 | 663 if (cache_index >= 0) { |
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664 result_oop = this_oop->resolved_references()->obj_at(cache_index); |
1602 | 665 if (result_oop != NULL) { |
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666 return result_oop; |
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667 // That was easy... |
1602 | 668 } |
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669 index = this_oop->object_to_cp_index(cache_index); |
1602 | 670 } |
671 | |
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672 jvalue prim_value; // temp used only in a few cases below |
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673 |
1602 | 674 int tag_value = this_oop->tag_at(index).value(); |
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675 |
1602 | 676 switch (tag_value) { |
677 | |
678 case JVM_CONSTANT_UnresolvedClass: | |
679 case JVM_CONSTANT_UnresolvedClassInError: | |
680 case JVM_CONSTANT_Class: | |
681 { | |
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682 assert(cache_index == _no_index_sentinel, "should not have been set"); |
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683 Klass* resolved = klass_at_impl(this_oop, index, CHECK_NULL); |
1602 | 684 // ldc wants the java mirror. |
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685 result_oop = resolved->java_mirror(); |
1602 | 686 break; |
687 } | |
688 | |
689 case JVM_CONSTANT_String: | |
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690 assert(cache_index != _no_index_sentinel, "should have been set"); |
1602 | 691 if (this_oop->is_pseudo_string_at(index)) { |
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692 result_oop = this_oop->pseudo_string_at(index, cache_index); |
1602 | 693 break; |
694 } | |
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695 result_oop = string_at_impl(this_oop, index, cache_index, CHECK_NULL); |
1602 | 696 break; |
697 | |
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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 | |
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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 | |
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1098 void ConstantPool::copy_operands(constantPoolHandle from_cp, |
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1099 constantPoolHandle to_cp, |
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1100 TRAPS) { |
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1101 |
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1102 int from_oplen = operand_array_length(from_cp->operands()); |
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1103 int old_oplen = operand_array_length(to_cp->operands()); |
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1104 if (from_oplen != 0) { |
6934 | 1105 ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); |
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1106 // append my operands to the target's operands array |
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1107 if (old_oplen == 0) { |
6934 | 1108 // Can't just reuse from_cp's operand list because of deallocation issues |
1109 int len = from_cp->operands()->length(); | |
1110 Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); | |
1111 Copy::conjoint_memory_atomic( | |
1112 from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); | |
1113 to_cp->set_operands(new_ops); | |
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1114 } else { |
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1115 int old_len = to_cp->operands()->length(); |
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1116 int from_len = from_cp->operands()->length(); |
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1117 int old_off = old_oplen * sizeof(u2); |
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1118 int from_off = from_oplen * sizeof(u2); |
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1119 // Use the metaspace for the destination constant pool |
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1120 Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); |
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1121 int fillp = 0, len = 0; |
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1122 // first part of dest |
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1123 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), |
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1124 new_operands->adr_at(fillp), |
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1125 (len = old_off) * sizeof(u2)); |
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1126 fillp += len; |
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1127 // first part of src |
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1128 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), |
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1129 new_operands->adr_at(fillp), |
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1130 (len = from_off) * sizeof(u2)); |
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1131 fillp += len; |
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1132 // second part of dest |
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1133 Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), |
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1134 new_operands->adr_at(fillp), |
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1135 (len = old_len - old_off) * sizeof(u2)); |
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1136 fillp += len; |
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1137 // second part of src |
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1138 Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), |
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1139 new_operands->adr_at(fillp), |
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1140 (len = from_len - from_off) * sizeof(u2)); |
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1141 fillp += len; |
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1142 assert(fillp == new_operands->length(), ""); |
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1143 |
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1144 // Adjust indexes in the first part of the copied operands array. |
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1145 for (int j = 0; j < from_oplen; j++) { |
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1146 int offset = operand_offset_at(new_operands, old_oplen + j); |
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1147 assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); |
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1148 offset += old_len; // every new tuple is preceded by old_len extra u2's |
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1149 operand_offset_at_put(new_operands, old_oplen + j, offset); |
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1150 } |
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1151 |
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1152 // replace target operands array with combined array |
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1153 to_cp->set_operands(new_operands); |
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1154 } |
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1155 } |
7952
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1156 } // end copy_operands() |
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1157 |
7952
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1158 |
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1159 // Copy this constant pool's entries at start_i to end_i (inclusive) |
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1160 // to the constant pool to_cp's entries starting at to_i. A total of |
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1161 // (end_i - start_i) + 1 entries are copied. |
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1162 void ConstantPool::copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, |
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1163 constantPoolHandle to_cp, int to_i, TRAPS) { |
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1164 |
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1165 |
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1166 int dest_i = to_i; // leave original alone for debug purposes |
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1167 |
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1168 for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) { |
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1169 copy_entry_to(from_cp, src_i, to_cp, dest_i, CHECK); |
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1170 |
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1171 switch (from_cp->tag_at(src_i).value()) { |
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1172 case JVM_CONSTANT_Double: |
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1173 case JVM_CONSTANT_Long: |
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1174 // double and long take two constant pool entries |
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1175 src_i += 2; |
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1176 dest_i += 2; |
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1177 break; |
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1178 |
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1179 default: |
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1180 // all others take one constant pool entry |
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1181 src_i++; |
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1182 dest_i++; |
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1183 break; |
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1184 } |
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1185 } |
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1186 copy_operands(from_cp, to_cp, CHECK); |
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1187 |
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1188 } // end copy_cp_to_impl() |
0 | 1189 |
1190 | |
1191 // Copy this constant pool's entry at from_i to the constant pool | |
1192 // to_cp's entry at to_i. | |
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1193 void ConstantPool::copy_entry_to(constantPoolHandle from_cp, int from_i, |
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1194 constantPoolHandle to_cp, int to_i, |
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1195 TRAPS) { |
0 | 1196 |
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1197 int tag = from_cp->tag_at(from_i).value(); |
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1198 switch (tag) { |
0 | 1199 case JVM_CONSTANT_Class: |
1200 { | |
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1201 Klass* k = from_cp->klass_at(from_i, CHECK); |
0 | 1202 to_cp->klass_at_put(to_i, k); |
1203 } break; | |
1204 | |
1205 case JVM_CONSTANT_ClassIndex: | |
1206 { | |
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1207 jint ki = from_cp->klass_index_at(from_i); |
0 | 1208 to_cp->klass_index_at_put(to_i, ki); |
1209 } break; | |
1210 | |
1211 case JVM_CONSTANT_Double: | |
1212 { | |
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1213 jdouble d = from_cp->double_at(from_i); |
0 | 1214 to_cp->double_at_put(to_i, d); |
1215 // double takes two constant pool entries so init second entry's tag | |
1216 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1217 } break; | |
1218 | |
1219 case JVM_CONSTANT_Fieldref: | |
1220 { | |
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1221 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1222 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1223 to_cp->field_at_put(to_i, class_index, name_and_type_index); |
1224 } break; | |
1225 | |
1226 case JVM_CONSTANT_Float: | |
1227 { | |
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1228 jfloat f = from_cp->float_at(from_i); |
0 | 1229 to_cp->float_at_put(to_i, f); |
1230 } break; | |
1231 | |
1232 case JVM_CONSTANT_Integer: | |
1233 { | |
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1234 jint i = from_cp->int_at(from_i); |
0 | 1235 to_cp->int_at_put(to_i, i); |
1236 } break; | |
1237 | |
1238 case JVM_CONSTANT_InterfaceMethodref: | |
1239 { | |
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1240 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1241 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1242 to_cp->interface_method_at_put(to_i, class_index, name_and_type_index); |
1243 } break; | |
1244 | |
1245 case JVM_CONSTANT_Long: | |
1246 { | |
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1247 jlong l = from_cp->long_at(from_i); |
0 | 1248 to_cp->long_at_put(to_i, l); |
1249 // long takes two constant pool entries so init second entry's tag | |
1250 to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid); | |
1251 } break; | |
1252 | |
1253 case JVM_CONSTANT_Methodref: | |
1254 { | |
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1255 int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
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1256 int name_and_type_index = from_cp->uncached_name_and_type_ref_index_at(from_i); |
0 | 1257 to_cp->method_at_put(to_i, class_index, name_and_type_index); |
1258 } break; | |
1259 | |
1260 case JVM_CONSTANT_NameAndType: | |
1261 { | |
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1262 int name_ref_index = from_cp->name_ref_index_at(from_i); |
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1263 int signature_ref_index = from_cp->signature_ref_index_at(from_i); |
0 | 1264 to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index); |
1265 } break; | |
1266 | |
1267 case JVM_CONSTANT_StringIndex: | |
1268 { | |
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|
1269 jint si = from_cp->string_index_at(from_i); |
0 | 1270 to_cp->string_index_at_put(to_i, si); |
1271 } break; | |
1272 | |
1273 case JVM_CONSTANT_UnresolvedClass: | |
1274 { | |
2332
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|
1275 // Can be resolved after checking tag, so check the slot first. |
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|
1276 CPSlot entry = from_cp->slot_at(from_i); |
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1277 if (entry.is_resolved()) { |
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1278 assert(entry.get_klass()->is_klass(), "must be"); |
2332
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|
1279 // Already resolved |
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1280 to_cp->klass_at_put(to_i, entry.get_klass()); |
2332
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1281 } else { |
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1282 to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); |
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1283 } |
0 | 1284 } break; |
1285 | |
1286 case JVM_CONSTANT_UnresolvedClassInError: | |
1287 { | |
2177
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1288 Symbol* k = from_cp->unresolved_klass_at(from_i); |
0 | 1289 to_cp->unresolved_klass_at_put(to_i, k); |
1290 to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError); | |
1291 } break; | |
1292 | |
1293 | |
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1294 case JVM_CONSTANT_String: |
0 | 1295 { |
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1296 Symbol* s = from_cp->unresolved_string_at(from_i); |
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1297 to_cp->unresolved_string_at_put(to_i, s); |
0 | 1298 } break; |
1299 | |
1300 case JVM_CONSTANT_Utf8: | |
1301 { | |
2177
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1302 Symbol* s = from_cp->symbol_at(from_i); |
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1303 // Need to increase refcount, the old one will be thrown away and deferenced |
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1304 s->increment_refcount(); |
0 | 1305 to_cp->symbol_at_put(to_i, s); |
1306 } break; | |
1307 | |
1602 | 1308 case JVM_CONSTANT_MethodType: |
1309 { | |
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1310 jint k = from_cp->method_type_index_at(from_i); |
1602 | 1311 to_cp->method_type_index_at_put(to_i, k); |
1312 } break; | |
1313 | |
1314 case JVM_CONSTANT_MethodHandle: | |
1315 { | |
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1316 int k1 = from_cp->method_handle_ref_kind_at(from_i); |
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1317 int k2 = from_cp->method_handle_index_at(from_i); |
1602 | 1318 to_cp->method_handle_index_at_put(to_i, k1, k2); |
1319 } break; | |
1320 | |
1660
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|
1321 case JVM_CONSTANT_InvokeDynamic: |
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|
1322 { |
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|
1323 int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); |
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|
1324 int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); |
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1325 k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands |
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|
1326 to_cp->invoke_dynamic_at_put(to_i, k1, k2); |
1660
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|
1327 } break; |
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|
1328 |
0 | 1329 // Invalid is used as the tag for the second constant pool entry |
1330 // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should | |
1331 // not be seen by itself. | |
1332 case JVM_CONSTANT_Invalid: // fall through | |
1333 | |
1334 default: | |
1335 { | |
1336 ShouldNotReachHere(); | |
1337 } break; | |
1338 } | |
1339 } // end copy_entry_to() | |
1340 | |
1341 | |
1342 // Search constant pool search_cp for an entry that matches this | |
1343 // constant pool's entry at pattern_i. Returns the index of a | |
1344 // matching entry or zero (0) if there is no matching entry. | |
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1345 int ConstantPool::find_matching_entry(int pattern_i, |
0 | 1346 constantPoolHandle search_cp, TRAPS) { |
1347 | |
1348 // index zero (0) is not used | |
1349 for (int i = 1; i < search_cp->length(); i++) { | |
1350 bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0); | |
1351 if (found) { | |
1352 return i; | |
1353 } | |
1354 } | |
1355 | |
1356 return 0; // entry not found; return unused index zero (0) | |
1357 } // end find_matching_entry() | |
1358 | |
1359 | |
1360 #ifndef PRODUCT | |
1361 | |
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1362 const char* ConstantPool::printable_name_at(int which) { |
0 | 1363 |
1364 constantTag tag = tag_at(which); | |
1365 | |
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1366 if (tag.is_string()) { |
0 | 1367 return string_at_noresolve(which); |
1368 } else if (tag.is_klass() || tag.is_unresolved_klass()) { | |
1369 return klass_name_at(which)->as_C_string(); | |
1370 } else if (tag.is_symbol()) { | |
1371 return symbol_at(which)->as_C_string(); | |
1372 } | |
1373 return ""; | |
1374 } | |
1375 | |
1376 #endif // PRODUCT | |
1377 | |
1378 | |
1379 // JVMTI GetConstantPool support | |
1380 | |
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1381 // For debugging of constant pool |
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1382 const bool debug_cpool = false; |
0 | 1383 |
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1384 #define DBG(code) do { if (debug_cpool) { (code); } } while(0) |
0 | 1385 |
1386 static void print_cpool_bytes(jint cnt, u1 *bytes) { | |
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1387 const char* WARN_MSG = "Must not be such entry!"; |
0 | 1388 jint size = 0; |
1389 u2 idx1, idx2; | |
1390 | |
1391 for (jint idx = 1; idx < cnt; idx++) { | |
1392 jint ent_size = 0; | |
1393 u1 tag = *bytes++; | |
1394 size++; // count tag | |
1395 | |
1396 printf("const #%03d, tag: %02d ", idx, tag); | |
1397 switch(tag) { | |
1398 case JVM_CONSTANT_Invalid: { | |
1399 printf("Invalid"); | |
1400 break; | |
1401 } | |
1402 case JVM_CONSTANT_Unicode: { | |
1403 printf("Unicode %s", WARN_MSG); | |
1404 break; | |
1405 } | |
1406 case JVM_CONSTANT_Utf8: { | |
1407 u2 len = Bytes::get_Java_u2(bytes); | |
1408 char str[128]; | |
1409 if (len > 127) { | |
1410 len = 127; | |
1411 } | |
1412 strncpy(str, (char *) (bytes+2), len); | |
1413 str[len] = '\0'; | |
1414 printf("Utf8 \"%s\"", str); | |
1415 ent_size = 2 + len; | |
1416 break; | |
1417 } | |
1418 case JVM_CONSTANT_Integer: { | |
1419 u4 val = Bytes::get_Java_u4(bytes); | |
1420 printf("int %d", *(int *) &val); | |
1421 ent_size = 4; | |
1422 break; | |
1423 } | |
1424 case JVM_CONSTANT_Float: { | |
1425 u4 val = Bytes::get_Java_u4(bytes); | |
1426 printf("float %5.3ff", *(float *) &val); | |
1427 ent_size = 4; | |
1428 break; | |
1429 } | |
1430 case JVM_CONSTANT_Long: { | |
1431 u8 val = Bytes::get_Java_u8(bytes); | |
3960 | 1432 printf("long "INT64_FORMAT, (int64_t) *(jlong *) &val); |
0 | 1433 ent_size = 8; |
1434 idx++; // Long takes two cpool slots | |
1435 break; | |
1436 } | |
1437 case JVM_CONSTANT_Double: { | |
1438 u8 val = Bytes::get_Java_u8(bytes); | |
1439 printf("double %5.3fd", *(jdouble *)&val); | |
1440 ent_size = 8; | |
1441 idx++; // Double takes two cpool slots | |
1442 break; | |
1443 } | |
1444 case JVM_CONSTANT_Class: { | |
1445 idx1 = Bytes::get_Java_u2(bytes); | |
1446 printf("class #%03d", idx1); | |
1447 ent_size = 2; | |
1448 break; | |
1449 } | |
1450 case JVM_CONSTANT_String: { | |
1451 idx1 = Bytes::get_Java_u2(bytes); | |
1452 printf("String #%03d", idx1); | |
1453 ent_size = 2; | |
1454 break; | |
1455 } | |
1456 case JVM_CONSTANT_Fieldref: { | |
1457 idx1 = Bytes::get_Java_u2(bytes); | |
1458 idx2 = Bytes::get_Java_u2(bytes+2); | |
1459 printf("Field #%03d, #%03d", (int) idx1, (int) idx2); | |
1460 ent_size = 4; | |
1461 break; | |
1462 } | |
1463 case JVM_CONSTANT_Methodref: { | |
1464 idx1 = Bytes::get_Java_u2(bytes); | |
1465 idx2 = Bytes::get_Java_u2(bytes+2); | |
1466 printf("Method #%03d, #%03d", idx1, idx2); | |
1467 ent_size = 4; | |
1468 break; | |
1469 } | |
1470 case JVM_CONSTANT_InterfaceMethodref: { | |
1471 idx1 = Bytes::get_Java_u2(bytes); | |
1472 idx2 = Bytes::get_Java_u2(bytes+2); | |
1473 printf("InterfMethod #%03d, #%03d", idx1, idx2); | |
1474 ent_size = 4; | |
1475 break; | |
1476 } | |
1477 case JVM_CONSTANT_NameAndType: { | |
1478 idx1 = Bytes::get_Java_u2(bytes); | |
1479 idx2 = Bytes::get_Java_u2(bytes+2); | |
1480 printf("NameAndType #%03d, #%03d", idx1, idx2); | |
1481 ent_size = 4; | |
1482 break; | |
1483 } | |
1484 case JVM_CONSTANT_ClassIndex: { | |
1485 printf("ClassIndex %s", WARN_MSG); | |
1486 break; | |
1487 } | |
1488 case JVM_CONSTANT_UnresolvedClass: { | |
1489 printf("UnresolvedClass: %s", WARN_MSG); | |
1490 break; | |
1491 } | |
1492 case JVM_CONSTANT_UnresolvedClassInError: { | |
1493 printf("UnresolvedClassInErr: %s", WARN_MSG); | |
1494 break; | |
1495 } | |
1496 case JVM_CONSTANT_StringIndex: { | |
1497 printf("StringIndex: %s", WARN_MSG); | |
1498 break; | |
1499 } | |
1500 } | |
1501 printf(";\n"); | |
1502 bytes += ent_size; | |
1503 size += ent_size; | |
1504 } | |
1505 printf("Cpool size: %d\n", size); | |
1506 fflush(0); | |
1507 return; | |
1508 } /* end print_cpool_bytes */ | |
1509 | |
1510 | |
1511 // Returns size of constant pool entry. | |
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1512 jint ConstantPool::cpool_entry_size(jint idx) { |
0 | 1513 switch(tag_at(idx).value()) { |
1514 case JVM_CONSTANT_Invalid: | |
1515 case JVM_CONSTANT_Unicode: | |
1516 return 1; | |
1517 | |
1518 case JVM_CONSTANT_Utf8: | |
1519 return 3 + symbol_at(idx)->utf8_length(); | |
1520 | |
1521 case JVM_CONSTANT_Class: | |
1522 case JVM_CONSTANT_String: | |
1523 case JVM_CONSTANT_ClassIndex: | |
1524 case JVM_CONSTANT_UnresolvedClass: | |
1525 case JVM_CONSTANT_UnresolvedClassInError: | |
1526 case JVM_CONSTANT_StringIndex: | |
1602 | 1527 case JVM_CONSTANT_MethodType: |
0 | 1528 return 3; |
1529 | |
1602 | 1530 case JVM_CONSTANT_MethodHandle: |
1531 return 4; //tag, ref_kind, ref_index | |
1532 | |
0 | 1533 case JVM_CONSTANT_Integer: |
1534 case JVM_CONSTANT_Float: | |
1535 case JVM_CONSTANT_Fieldref: | |
1536 case JVM_CONSTANT_Methodref: | |
1537 case JVM_CONSTANT_InterfaceMethodref: | |
1538 case JVM_CONSTANT_NameAndType: | |
1913
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1539 return 5; |
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1540 |
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1541 case JVM_CONSTANT_InvokeDynamic: |
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1542 // u1 tag, u2 bsm, u2 nt |
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1543 return 5; |
0 | 1544 |
1545 case JVM_CONSTANT_Long: | |
1546 case JVM_CONSTANT_Double: | |
1547 return 9; | |
1548 } | |
1549 assert(false, "cpool_entry_size: Invalid constant pool entry tag"); | |
1550 return 1; | |
1551 } /* end cpool_entry_size */ | |
1552 | |
1553 | |
1554 // SymbolHashMap is used to find a constant pool index from a string. | |
1555 // This function fills in SymbolHashMaps, one for utf8s and one for | |
1556 // class names, returns size of the cpool raw bytes. | |
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1557 jint ConstantPool::hash_entries_to(SymbolHashMap *symmap, |
0 | 1558 SymbolHashMap *classmap) { |
1559 jint size = 0; | |
1560 | |
1561 for (u2 idx = 1; idx < length(); idx++) { | |
1562 u2 tag = tag_at(idx).value(); | |
1563 size += cpool_entry_size(idx); | |
1564 | |
1565 switch(tag) { | |
1566 case JVM_CONSTANT_Utf8: { | |
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1567 Symbol* sym = symbol_at(idx); |
0 | 1568 symmap->add_entry(sym, idx); |
1569 DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx)); | |
1570 break; | |
1571 } | |
1572 case JVM_CONSTANT_Class: | |
1573 case JVM_CONSTANT_UnresolvedClass: | |
1574 case JVM_CONSTANT_UnresolvedClassInError: { | |
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1575 Symbol* sym = klass_name_at(idx); |
0 | 1576 classmap->add_entry(sym, idx); |
1577 DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx)); | |
1578 break; | |
1579 } | |
1580 case JVM_CONSTANT_Long: | |
1581 case JVM_CONSTANT_Double: { | |
1582 idx++; // Both Long and Double take two cpool slots | |
1583 break; | |
1584 } | |
1585 } | |
1586 } | |
1587 return size; | |
1588 } /* end hash_utf8_entries_to */ | |
1589 | |
1590 | |
1591 // Copy cpool bytes. | |
1592 // Returns: | |
1593 // 0, in case of OutOfMemoryError | |
1594 // -1, in case of internal error | |
1595 // > 0, count of the raw cpool bytes that have been copied | |
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1596 int ConstantPool::copy_cpool_bytes(int cpool_size, |
0 | 1597 SymbolHashMap* tbl, |
1598 unsigned char *bytes) { | |
1599 u2 idx1, idx2; | |
1600 jint size = 0; | |
1601 jint cnt = length(); | |
1602 unsigned char *start_bytes = bytes; | |
1603 | |
1604 for (jint idx = 1; idx < cnt; idx++) { | |
1605 u1 tag = tag_at(idx).value(); | |
1606 jint ent_size = cpool_entry_size(idx); | |
1607 | |
1608 assert(size + ent_size <= cpool_size, "Size mismatch"); | |
1609 | |
1610 *bytes = tag; | |
1611 DBG(printf("#%03hd tag=%03hd, ", idx, tag)); | |
1612 switch(tag) { | |
1613 case JVM_CONSTANT_Invalid: { | |
1614 DBG(printf("JVM_CONSTANT_Invalid")); | |
1615 break; | |
1616 } | |
1617 case JVM_CONSTANT_Unicode: { | |
1618 assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode"); | |
1619 DBG(printf("JVM_CONSTANT_Unicode")); | |
1620 break; | |
1621 } | |
1622 case JVM_CONSTANT_Utf8: { | |
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1623 Symbol* sym = symbol_at(idx); |
0 | 1624 char* str = sym->as_utf8(); |
1625 // Warning! It's crashing on x86 with len = sym->utf8_length() | |
1626 int len = (int) strlen(str); | |
1627 Bytes::put_Java_u2((address) (bytes+1), (u2) len); | |
1628 for (int i = 0; i < len; i++) { | |
1629 bytes[3+i] = (u1) str[i]; | |
1630 } | |
1631 DBG(printf("JVM_CONSTANT_Utf8: %s ", str)); | |
1632 break; | |
1633 } | |
1634 case JVM_CONSTANT_Integer: { | |
1635 jint val = int_at(idx); | |
1636 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1637 break; | |
1638 } | |
1639 case JVM_CONSTANT_Float: { | |
1640 jfloat val = float_at(idx); | |
1641 Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val); | |
1642 break; | |
1643 } | |
1644 case JVM_CONSTANT_Long: { | |
1645 jlong val = long_at(idx); | |
1646 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1647 idx++; // Long takes two cpool slots | |
1648 break; | |
1649 } | |
1650 case JVM_CONSTANT_Double: { | |
1651 jdouble val = double_at(idx); | |
1652 Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val); | |
1653 idx++; // Double takes two cpool slots | |
1654 break; | |
1655 } | |
1656 case JVM_CONSTANT_Class: | |
1657 case JVM_CONSTANT_UnresolvedClass: | |
1658 case JVM_CONSTANT_UnresolvedClassInError: { | |
1659 *bytes = JVM_CONSTANT_Class; | |
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1660 Symbol* sym = klass_name_at(idx); |
0 | 1661 idx1 = tbl->symbol_to_value(sym); |
1662 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1663 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1664 DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8())); | |
1665 break; | |
1666 } | |
1667 case JVM_CONSTANT_String: { | |
1668 *bytes = JVM_CONSTANT_String; | |
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1669 Symbol* sym = unresolved_string_at(idx); |
0 | 1670 idx1 = tbl->symbol_to_value(sym); |
1671 assert(idx1 != 0, "Have not found a hashtable entry"); | |
1672 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
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1673 DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); |
0 | 1674 break; |
1675 } | |
1676 case JVM_CONSTANT_Fieldref: | |
1677 case JVM_CONSTANT_Methodref: | |
1678 case JVM_CONSTANT_InterfaceMethodref: { | |
1679 idx1 = uncached_klass_ref_index_at(idx); | |
1680 idx2 = uncached_name_and_type_ref_index_at(idx); | |
1681 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1682 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1683 DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2)); | |
1684 break; | |
1685 } | |
1686 case JVM_CONSTANT_NameAndType: { | |
1687 idx1 = name_ref_index_at(idx); | |
1688 idx2 = signature_ref_index_at(idx); | |
1689 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1690 Bytes::put_Java_u2((address) (bytes+3), idx2); | |
1691 DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2)); | |
1692 break; | |
1693 } | |
1694 case JVM_CONSTANT_ClassIndex: { | |
1695 *bytes = JVM_CONSTANT_Class; | |
1696 idx1 = klass_index_at(idx); | |
1697 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1698 DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1)); | |
1699 break; | |
1700 } | |
1701 case JVM_CONSTANT_StringIndex: { | |
1702 *bytes = JVM_CONSTANT_String; | |
1703 idx1 = string_index_at(idx); | |
1704 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1705 DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1)); | |
1706 break; | |
1707 } | |
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1708 case JVM_CONSTANT_MethodHandle: |
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1709 case JVM_CONSTANT_MethodHandleInError: { |
1602 | 1710 *bytes = JVM_CONSTANT_MethodHandle; |
1711 int kind = method_handle_ref_kind_at(idx); | |
1712 idx1 = method_handle_index_at(idx); | |
1713 *(bytes+1) = (unsigned char) kind; | |
1714 Bytes::put_Java_u2((address) (bytes+2), idx1); | |
1715 DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); | |
1716 break; | |
1717 } | |
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1718 case JVM_CONSTANT_MethodType: |
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1719 case JVM_CONSTANT_MethodTypeInError: { |
1602 | 1720 *bytes = JVM_CONSTANT_MethodType; |
1721 idx1 = method_type_index_at(idx); | |
1722 Bytes::put_Java_u2((address) (bytes+1), idx1); | |
1723 DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); | |
1724 break; | |
1725 } | |
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1726 case JVM_CONSTANT_InvokeDynamic: { |
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1727 *bytes = tag; |
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1728 idx1 = extract_low_short_from_int(*int_at_addr(idx)); |
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1729 idx2 = extract_high_short_from_int(*int_at_addr(idx)); |
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1730 assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); |
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1731 Bytes::put_Java_u2((address) (bytes+1), idx1); |
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1732 Bytes::put_Java_u2((address) (bytes+3), idx2); |
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1733 DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); |
1660
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1734 break; |
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1735 } |
0 | 1736 } |
1737 DBG(printf("\n")); | |
1738 bytes += ent_size; | |
1739 size += ent_size; | |
1740 } | |
1741 assert(size == cpool_size, "Size mismatch"); | |
1742 | |
1743 // Keep temorarily for debugging until it's stable. | |
1744 DBG(print_cpool_bytes(cnt, start_bytes)); | |
1745 return (int)(bytes - start_bytes); | |
1746 } /* end copy_cpool_bytes */ | |
1747 | |
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1748 #undef DBG |
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1749 |
0 | 1750 |
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1751 void ConstantPool::set_on_stack(const bool value) { |
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1752 if (value) { |
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1753 _flags |= _on_stack; |
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1754 } else { |
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1755 _flags &= ~_on_stack; |
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1756 } |
6725
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1757 if (value) MetadataOnStackMark::record(this); |
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1758 } |
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1759 |
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1760 // JSR 292 support for patching constant pool oops after the class is linked and |
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1761 // the oop array for resolved references are created. |
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1762 // We can't do this during classfile parsing, which is how the other indexes are |
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1763 // patched. The other patches are applied early for some error checking |
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1764 // so only defer the pseudo_strings. |
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1765 void ConstantPool::patch_resolved_references( |
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1766 GrowableArray<Handle>* cp_patches) { |
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1767 assert(EnableInvokeDynamic, ""); |
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1768 for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused |
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1769 Handle patch = cp_patches->at(index); |
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1770 if (patch.not_null()) { |
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1771 assert (tag_at(index).is_string(), "should only be string left"); |
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1772 // Patching a string means pre-resolving it. |
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1773 // The spelling in the constant pool is ignored. |
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1774 // The constant reference may be any object whatever. |
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1775 // If it is not a real interned string, the constant is referred |
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1776 // to as a "pseudo-string", and must be presented to the CP |
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1777 // explicitly, because it may require scavenging. |
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1778 int obj_index = cp_to_object_index(index); |
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1779 pseudo_string_at_put(index, obj_index, patch()); |
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1780 DEBUG_ONLY(cp_patches->at_put(index, Handle());) |
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1781 } |
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1782 } |
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1783 #ifdef ASSERT |
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1784 // Ensure that all the patches have been used. |
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1785 for (int index = 0; index < cp_patches->length(); index++) { |
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1786 assert(cp_patches->at(index).is_null(), |
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1787 err_msg("Unused constant pool patch at %d in class file %s", |
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1788 index, |
6940
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8000725: NPG: method_holder() and pool_holder() and pool_holder field should be InstanceKlass
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1789 pool_holder()->external_name())); |
6725
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1790 } |
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1791 #endif // ASSERT |
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1792 } |
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1793 |
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1794 #ifndef PRODUCT |
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1795 |
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1796 // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool |
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1797 void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { |
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1798 guarantee(obj->is_constantPool(), "object must be constant pool"); |
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1799 constantPoolHandle cp(THREAD, (ConstantPool*)obj); |
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1800 guarantee(cp->pool_holder() != NULL, "must be fully loaded"); |
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1801 |
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1802 for (int i = 0; i< cp->length(); i++) { |
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1803 if (cp->tag_at(i).is_unresolved_klass()) { |
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1804 // This will force loading of the class |
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1805 Klass* klass = cp->klass_at(i, CHECK); |
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1806 if (klass->oop_is_instance()) { |
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1807 // Force initialization of class |
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1808 InstanceKlass::cast(klass)->initialize(CHECK); |
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1809 } |
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1810 } |
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1811 } |
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1812 } |
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1813 |
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1814 #endif |
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1815 |
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1816 |
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1817 // Printing |
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1818 |
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1819 void ConstantPool::print_on(outputStream* st) const { |
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1820 EXCEPTION_MARK; |
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1821 assert(is_constantPool(), "must be constantPool"); |
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1822 st->print_cr(internal_name()); |
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1823 if (flags() != 0) { |
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1824 st->print(" - flags: 0x%x", flags()); |
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1825 if (has_preresolution()) st->print(" has_preresolution"); |
7949
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1826 if (on_stack()) st->print(" on_stack"); |
6725
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1827 st->cr(); |
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1828 } |
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1829 if (pool_holder() != NULL) { |
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1830 st->print_cr(" - holder: " INTPTR_FORMAT, pool_holder()); |
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1831 } |
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1832 st->print_cr(" - cache: " INTPTR_FORMAT, cache()); |
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1833 st->print_cr(" - resolved_references: " INTPTR_FORMAT, resolved_references()); |
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1834 st->print_cr(" - reference_map: " INTPTR_FORMAT, reference_map()); |
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1835 |
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1836 for (int index = 1; index < length(); index++) { // Index 0 is unused |
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1837 ((ConstantPool*)this)->print_entry_on(index, st); |
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1838 switch (tag_at(index).value()) { |
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1839 case JVM_CONSTANT_Long : |
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1840 case JVM_CONSTANT_Double : |
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1841 index++; // Skip entry following eigth-byte constant |
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1842 } |
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1843 |
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1844 } |
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1845 st->cr(); |
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1846 } |
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1847 |
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1848 // Print one constant pool entry |
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1849 void ConstantPool::print_entry_on(const int index, outputStream* st) { |
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1850 EXCEPTION_MARK; |
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1851 st->print(" - %3d : ", index); |
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1852 tag_at(index).print_on(st); |
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1853 st->print(" : "); |
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1854 switch (tag_at(index).value()) { |
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1855 case JVM_CONSTANT_Class : |
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1856 { Klass* k = klass_at(index, CATCH); |
8782
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8009593: [parfait] Null pointer deference in hotspot/src/share/vm/oops/constantPool.cpp
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|
1857 guarantee(k != NULL, "need klass"); |
6725
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1858 k->print_value_on(st); |
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1859 st->print(" {0x%lx}", (address)k); |
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1860 } |
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1861 break; |
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1862 case JVM_CONSTANT_Fieldref : |
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1863 case JVM_CONSTANT_Methodref : |
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1864 case JVM_CONSTANT_InterfaceMethodref : |
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1865 st->print("klass_index=%d", uncached_klass_ref_index_at(index)); |
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1866 st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); |
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1867 break; |
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1868 case JVM_CONSTANT_String : |
8104 | 1869 if (is_pseudo_string_at(index)) { |
1870 oop anObj = pseudo_string_at(index); | |
1871 anObj->print_value_on(st); | |
1872 st->print(" {0x%lx}", (address)anObj); | |
1873 } else { | |
1874 unresolved_string_at(index)->print_value_on(st); | |
1875 } | |
6725
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1876 break; |
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1877 case JVM_CONSTANT_Integer : |
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1878 st->print("%d", int_at(index)); |
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|
1879 break; |
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1880 case JVM_CONSTANT_Float : |
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1881 st->print("%f", float_at(index)); |
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1882 break; |
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1883 case JVM_CONSTANT_Long : |
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1884 st->print_jlong(long_at(index)); |
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1885 break; |
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1886 case JVM_CONSTANT_Double : |
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1887 st->print("%lf", double_at(index)); |
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1888 break; |
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1889 case JVM_CONSTANT_NameAndType : |
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1890 st->print("name_index=%d", name_ref_index_at(index)); |
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1891 st->print(" signature_index=%d", signature_ref_index_at(index)); |
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1892 break; |
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1893 case JVM_CONSTANT_Utf8 : |
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1894 symbol_at(index)->print_value_on(st); |
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1895 break; |
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1896 case JVM_CONSTANT_UnresolvedClass : // fall-through |
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1897 case JVM_CONSTANT_UnresolvedClassInError: { |
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1898 // unresolved_klass_at requires lock or safe world. |
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1899 CPSlot entry = slot_at(index); |
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1900 if (entry.is_resolved()) { |
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1901 entry.get_klass()->print_value_on(st); |
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1902 } else { |
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1903 entry.get_symbol()->print_value_on(st); |
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1904 } |
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1905 } |
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1906 break; |
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1907 case JVM_CONSTANT_MethodHandle : |
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1908 case JVM_CONSTANT_MethodHandleInError : |
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1909 st->print("ref_kind=%d", method_handle_ref_kind_at(index)); |
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1910 st->print(" ref_index=%d", method_handle_index_at(index)); |
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1911 break; |
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1912 case JVM_CONSTANT_MethodType : |
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1913 case JVM_CONSTANT_MethodTypeInError : |
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1914 st->print("signature_index=%d", method_type_index_at(index)); |
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1915 break; |
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1916 case JVM_CONSTANT_InvokeDynamic : |
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1917 { |
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1918 st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); |
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1919 st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); |
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1920 int argc = invoke_dynamic_argument_count_at(index); |
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1921 if (argc > 0) { |
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1922 for (int arg_i = 0; arg_i < argc; arg_i++) { |
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1923 int arg = invoke_dynamic_argument_index_at(index, arg_i); |
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1924 st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); |
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1925 } |
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1926 st->print("}"); |
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1927 } |
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1928 } |
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1929 break; |
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1930 default: |
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1931 ShouldNotReachHere(); |
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1932 break; |
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1933 } |
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1934 st->cr(); |
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1935 } |
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1936 |
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1937 void ConstantPool::print_value_on(outputStream* st) const { |
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1938 assert(is_constantPool(), "must be constantPool"); |
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1939 st->print("constant pool [%d]", length()); |
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1940 if (has_preresolution()) st->print("/preresolution"); |
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1941 if (operands() != NULL) st->print("/operands[%d]", operands()->length()); |
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1942 print_address_on(st); |
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1943 st->print(" for "); |
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1944 pool_holder()->print_value_on(st); |
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1945 if (pool_holder() != NULL) { |
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1946 bool extra = (pool_holder()->constants() != this); |
6725
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1947 if (extra) st->print(" (extra)"); |
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1948 } |
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1949 if (cache() != NULL) { |
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1950 st->print(" cache=" PTR_FORMAT, cache()); |
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1951 } |
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1952 } |
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1953 |
7956 | 1954 #if INCLUDE_SERVICES |
1955 // Size Statistics | |
1956 void ConstantPool::collect_statistics(KlassSizeStats *sz) const { | |
1957 sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); | |
1958 sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); | |
1959 sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); | |
1960 sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); | |
1961 sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); | |
1962 | |
1963 sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + | |
1964 sz->_cp_refmap_bytes; | |
1965 sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; | |
1966 } | |
1967 #endif // INCLUDE_SERVICES | |
6725
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1968 |
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1969 // Verification |
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1970 |
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1971 void ConstantPool::verify_on(outputStream* st) { |
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1972 guarantee(is_constantPool(), "object must be constant pool"); |
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1973 for (int i = 0; i< length(); i++) { |
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1974 constantTag tag = tag_at(i); |
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1975 CPSlot entry = slot_at(i); |
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1976 if (tag.is_klass()) { |
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1977 if (entry.is_resolved()) { |
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1978 guarantee(entry.get_klass()->is_metadata(), "should be metadata"); |
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1979 guarantee(entry.get_klass()->is_klass(), "should be klass"); |
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1980 } |
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1981 } else if (tag.is_unresolved_klass()) { |
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1982 if (entry.is_resolved()) { |
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1983 guarantee(entry.get_klass()->is_metadata(), "should be metadata"); |
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1984 guarantee(entry.get_klass()->is_klass(), "should be klass"); |
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1985 } |
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1986 } else if (tag.is_symbol()) { |
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1987 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
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1988 } else if (tag.is_string()) { |
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1989 guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
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1990 } |
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1991 } |
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1992 if (cache() != NULL) { |
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1993 // Note: cache() can be NULL before a class is completely setup or |
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1994 // in temporary constant pools used during constant pool merging |
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1995 guarantee(cache()->is_metadata(), "should be metadata"); |
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1996 guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); |
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1997 } |
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1998 if (pool_holder() != NULL) { |
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1999 // Note: pool_holder() can be NULL in temporary constant pools |
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2000 // used during constant pool merging |
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2001 guarantee(pool_holder()->is_metadata(), "should be metadata"); |
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2002 guarantee(pool_holder()->is_klass(), "should be klass"); |
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2003 } |
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2004 } |
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2005 |
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2006 |
2177
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2007 void SymbolHashMap::add_entry(Symbol* sym, u2 value) { |
0 | 2008 char *str = sym->as_utf8(); |
2009 unsigned int hash = compute_hash(str, sym->utf8_length()); | |
2010 unsigned int index = hash % table_size(); | |
2011 | |
2012 // check if already in map | |
2013 // we prefer the first entry since it is more likely to be what was used in | |
2014 // the class file | |
2015 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2016 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2017 if (en->hash() == hash && en->symbol() == sym) { | |
2018 return; // already there | |
2019 } | |
2020 } | |
2021 | |
2022 SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value); | |
2023 entry->set_next(bucket(index)); | |
2024 _buckets[index].set_entry(entry); | |
2025 assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2026 } | |
2027 | |
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2028 SymbolHashMapEntry* SymbolHashMap::find_entry(Symbol* sym) { |
0 | 2029 assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL"); |
2030 char *str = sym->as_utf8(); | |
2031 int len = sym->utf8_length(); | |
2032 unsigned int hash = SymbolHashMap::compute_hash(str, len); | |
2033 unsigned int index = hash % table_size(); | |
2034 for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) { | |
2035 assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL"); | |
2036 if (en->hash() == hash && en->symbol() == sym) { | |
2037 return en; | |
2038 } | |
2039 } | |
2040 return NULL; | |
2041 } |