Mercurial > hg > graal-compiler
annotate src/share/vm/oops/cpCache.cpp @ 7199:cd3d6a6b95d9
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Reviewed-by: kvn
author | twisti |
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date | Fri, 30 Nov 2012 15:23:16 -0800 |
parents | 80e866b1d053 |
children | db9981fd3124 8d9fc28831cc |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/shared/markSweep.inline.hpp" | |
27 #include "interpreter/interpreter.hpp" | |
28 #include "interpreter/rewriter.hpp" | |
29 #include "memory/universe.inline.hpp" | |
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30 #include "oops/cpCache.hpp" |
1972 | 31 #include "oops/objArrayOop.hpp" |
32 #include "oops/oop.inline.hpp" | |
33 #include "prims/jvmtiRedefineClassesTrace.hpp" | |
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34 #include "prims/methodHandles.hpp" |
1972 | 35 #include "runtime/handles.inline.hpp" |
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36 #ifndef SERIALGC |
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37 # include "gc_implementation/parallelScavenge/psPromotionManager.hpp" |
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38 #endif |
0 | 39 |
40 | |
41 // Implememtation of ConstantPoolCacheEntry | |
42 | |
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43 void ConstantPoolCacheEntry::initialize_entry(int index) { |
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44 assert(0 < index && index < 0x10000, "sanity check"); |
0 | 45 _indices = index; |
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46 assert(constant_pool_index() == index, ""); |
0 | 47 } |
48 | |
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49 int ConstantPoolCacheEntry::make_flags(TosState state, |
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50 int option_bits, |
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51 int field_index_or_method_params) { |
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52 assert(state < number_of_states, "Invalid state in make_flags"); |
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53 int f = ((int)state << tos_state_shift) | option_bits | field_index_or_method_params; |
0 | 54 // Preserve existing flag bit values |
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55 // The low bits are a field offset, or else the method parameter size. |
0 | 56 #ifdef ASSERT |
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57 TosState old_state = flag_state(); |
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58 assert(old_state == (TosState)0 || old_state == state, |
0 | 59 "inconsistent cpCache flags state"); |
60 #endif | |
61 return (_flags | f) ; | |
62 } | |
63 | |
64 void ConstantPoolCacheEntry::set_bytecode_1(Bytecodes::Code code) { | |
65 #ifdef ASSERT | |
66 // Read once. | |
67 volatile Bytecodes::Code c = bytecode_1(); | |
68 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
69 #endif | |
70 // Need to flush pending stores here before bytecode is written. | |
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71 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_1_shift)); |
0 | 72 } |
73 | |
74 void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) { | |
75 #ifdef ASSERT | |
76 // Read once. | |
77 volatile Bytecodes::Code c = bytecode_2(); | |
78 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
79 #endif | |
80 // Need to flush pending stores here before bytecode is written. | |
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81 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_2_shift)); |
0 | 82 } |
83 | |
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84 // Sets f1, ordering with previous writes. |
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85 void ConstantPoolCacheEntry::release_set_f1(Metadata* f1) { |
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86 assert(f1 != NULL, ""); |
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87 OrderAccess::release_store_ptr((HeapWord*) &_f1, f1); |
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88 } |
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89 |
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90 // Sets flags, but only if the value was previously zero. |
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91 bool ConstantPoolCacheEntry::init_flags_atomic(intptr_t flags) { |
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92 intptr_t result = Atomic::cmpxchg_ptr(flags, &_flags, 0); |
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93 return (result == 0); |
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94 } |
1903 | 95 |
0 | 96 // Note that concurrent update of both bytecodes can leave one of them |
97 // reset to zero. This is harmless; the interpreter will simply re-resolve | |
98 // the damaged entry. More seriously, the memory synchronization is needed | |
99 // to flush other fields (f1, f2) completely to memory before the bytecodes | |
100 // are updated, lest other processors see a non-zero bytecode but zero f1/f2. | |
101 void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code, | |
102 Bytecodes::Code put_code, | |
103 KlassHandle field_holder, | |
3938 | 104 int field_index, |
0 | 105 int field_offset, |
106 TosState field_type, | |
107 bool is_final, | |
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108 bool is_volatile, |
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109 Klass* root_klass) { |
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110 set_f1(field_holder()); |
0 | 111 set_f2(field_offset); |
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112 assert((field_index & field_index_mask) == field_index, |
0 | 113 "field index does not fit in low flag bits"); |
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114 set_field_flags(field_type, |
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115 ((is_volatile ? 1 : 0) << is_volatile_shift) | |
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116 ((is_final ? 1 : 0) << is_final_shift), |
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117 field_index); |
0 | 118 set_bytecode_1(get_code); |
119 set_bytecode_2(put_code); | |
120 NOT_PRODUCT(verify(tty)); | |
121 } | |
122 | |
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123 void ConstantPoolCacheEntry::set_parameter_size(int value) { |
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124 // This routine is called only in corner cases where the CPCE is not yet initialized. |
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125 // See AbstractInterpreter::deopt_continue_after_entry. |
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126 assert(_flags == 0 || parameter_size() == 0 || parameter_size() == value, |
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127 err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value)); |
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128 // Setting the parameter size by itself is only safe if the |
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129 // current value of _flags is 0, otherwise another thread may have |
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130 // updated it and we don't want to overwrite that value. Don't |
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131 // bother trying to update it once it's nonzero but always make |
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132 // sure that the final parameter size agrees with what was passed. |
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133 if (_flags == 0) { |
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134 Atomic::cmpxchg_ptr((value & parameter_size_mask), &_flags, 0); |
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135 } |
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136 guarantee(parameter_size() == value, |
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137 err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value)); |
0 | 138 } |
139 | |
140 void ConstantPoolCacheEntry::set_method(Bytecodes::Code invoke_code, | |
141 methodHandle method, | |
142 int vtable_index) { | |
143 assert(method->interpreter_entry() != NULL, "should have been set at this point"); | |
144 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache"); | |
145 | |
146 int byte_no = -1; | |
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147 bool change_to_virtual = false; |
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148 |
0 | 149 switch (invoke_code) { |
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150 case Bytecodes::_invokeinterface: |
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151 // We get here from InterpreterRuntime::resolve_invoke when an invokeinterface |
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152 // instruction somehow links to a non-interface method (in Object). |
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153 // In that case, the method has no itable index and must be invoked as a virtual. |
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154 // Set a flag to keep track of this corner case. |
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155 change_to_virtual = true; |
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156 |
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157 // ...and fall through as if we were handling invokevirtual: |
0 | 158 case Bytecodes::_invokevirtual: |
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159 { |
0 | 160 if (method->can_be_statically_bound()) { |
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161 // set_f2_as_vfinal_method checks if is_vfinal flag is true. |
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162 set_method_flags(as_TosState(method->result_type()), |
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163 ( 1 << is_vfinal_shift) | |
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164 ((method->is_final_method() ? 1 : 0) << is_final_shift) | |
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165 ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift), |
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166 method()->size_of_parameters()); |
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167 set_f2_as_vfinal_method(method()); |
0 | 168 } else { |
169 assert(vtable_index >= 0, "valid index"); | |
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170 assert(!method->is_final_method(), "sanity"); |
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171 set_method_flags(as_TosState(method->result_type()), |
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172 ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift), |
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173 method()->size_of_parameters()); |
0 | 174 set_f2(vtable_index); |
175 } | |
176 byte_no = 2; | |
177 break; | |
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178 } |
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179 |
0 | 180 case Bytecodes::_invokespecial: |
181 case Bytecodes::_invokestatic: | |
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182 // Note: Read and preserve the value of the is_vfinal flag on any |
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183 // invokevirtual bytecode shared with this constant pool cache entry. |
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184 // It is cheap and safe to consult is_vfinal() at all times. |
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185 // Once is_vfinal is set, it must stay that way, lest we get a dangling oop. |
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186 set_method_flags(as_TosState(method->result_type()), |
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187 ((is_vfinal() ? 1 : 0) << is_vfinal_shift) | |
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188 ((method->is_final_method() ? 1 : 0) << is_final_shift), |
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189 method()->size_of_parameters()); |
0 | 190 set_f1(method()); |
191 byte_no = 1; | |
192 break; | |
193 default: | |
194 ShouldNotReachHere(); | |
195 break; | |
196 } | |
197 | |
198 // Note: byte_no also appears in TemplateTable::resolve. | |
199 if (byte_no == 1) { | |
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200 assert(invoke_code != Bytecodes::_invokevirtual && |
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201 invoke_code != Bytecodes::_invokeinterface, ""); |
0 | 202 set_bytecode_1(invoke_code); |
203 } else if (byte_no == 2) { | |
204 if (change_to_virtual) { | |
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205 assert(invoke_code == Bytecodes::_invokeinterface, ""); |
0 | 206 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!! |
207 // | |
208 // Workaround for the case where we encounter an invokeinterface, but we | |
209 // should really have an _invokevirtual since the resolved method is a | |
210 // virtual method in java.lang.Object. This is a corner case in the spec | |
211 // but is presumably legal. javac does not generate this code. | |
212 // | |
213 // We set bytecode_1() to _invokeinterface, because that is the | |
214 // bytecode # used by the interpreter to see if it is resolved. | |
215 // We set bytecode_2() to _invokevirtual. | |
216 // See also interpreterRuntime.cpp. (8/25/2000) | |
217 // Only set resolved for the invokeinterface case if method is public. | |
218 // Otherwise, the method needs to be reresolved with caller for each | |
219 // interface call. | |
220 if (method->is_public()) set_bytecode_1(invoke_code); | |
221 } else { | |
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222 assert(invoke_code == Bytecodes::_invokevirtual, ""); |
0 | 223 } |
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224 // set up for invokevirtual, even if linking for invokeinterface also: |
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225 set_bytecode_2(Bytecodes::_invokevirtual); |
0 | 226 } else { |
227 ShouldNotReachHere(); | |
228 } | |
229 NOT_PRODUCT(verify(tty)); | |
230 } | |
231 | |
232 | |
233 void ConstantPoolCacheEntry::set_interface_call(methodHandle method, int index) { | |
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234 InstanceKlass* interf = method->method_holder(); |
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235 assert(interf->is_interface(), "must be an interface"); |
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236 assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here"); |
0 | 237 set_f1(interf); |
238 set_f2(index); | |
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239 set_method_flags(as_TosState(method->result_type()), |
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240 0, // no option bits |
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241 method()->size_of_parameters()); |
0 | 242 set_bytecode_1(Bytecodes::_invokeinterface); |
243 } | |
244 | |
245 | |
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246 void ConstantPoolCacheEntry::set_method_handle(constantPoolHandle cpool, const CallInfo &call_info) { |
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247 set_method_handle_common(cpool, Bytecodes::_invokehandle, call_info); |
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248 } |
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249 |
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250 void ConstantPoolCacheEntry::set_dynamic_call(constantPoolHandle cpool, const CallInfo &call_info) { |
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251 set_method_handle_common(cpool, Bytecodes::_invokedynamic, call_info); |
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252 } |
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253 |
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254 void ConstantPoolCacheEntry::set_method_handle_common(constantPoolHandle cpool, |
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255 Bytecodes::Code invoke_code, |
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256 const CallInfo &call_info) { |
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257 // NOTE: This CPCE can be the subject of data races. |
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258 // There are three words to update: flags, refs[f2], f1 (in that order). |
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259 // Writers must store all other values before f1. |
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260 // Readers must test f1 first for non-null before reading other fields. |
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261 // Competing writers must acquire exclusive access via a lock. |
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262 // A losing writer waits on the lock until the winner writes f1 and leaves |
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263 // the lock, so that when the losing writer returns, he can use the linked |
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264 // cache entry. |
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265 |
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266 MonitorLockerEx ml(cpool->lock()); |
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267 if (!is_f1_null()) { |
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268 return; |
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269 } |
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270 |
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271 const methodHandle adapter = call_info.resolved_method(); |
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272 const Handle appendix = call_info.resolved_appendix(); |
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273 const Handle method_type = call_info.resolved_method_type(); |
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274 const bool has_appendix = appendix.not_null(); |
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275 const bool has_method_type = method_type.not_null(); |
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276 |
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277 // Write the flags. |
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278 set_method_flags(as_TosState(adapter->result_type()), |
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279 ((has_appendix ? 1 : 0) << has_appendix_shift ) | |
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280 ((has_method_type ? 1 : 0) << has_method_type_shift) | |
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281 ( 1 << is_final_shift ), |
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282 adapter->size_of_parameters()); |
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283 |
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284 if (TraceInvokeDynamic) { |
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285 tty->print_cr("set_method_handle bc=%d appendix="PTR_FORMAT"%s method_type="PTR_FORMAT"%s method="PTR_FORMAT" ", |
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286 invoke_code, |
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287 (intptr_t)appendix(), (has_appendix ? "" : " (unused)"), |
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288 (intptr_t)method_type(), (has_method_type ? "" : " (unused)"), |
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289 (intptr_t)adapter()); |
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290 adapter->print(); |
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291 if (has_appendix) appendix()->print(); |
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292 } |
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293 |
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294 // Method handle invokes and invokedynamic sites use both cp cache words. |
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295 // refs[f2], if not null, contains a value passed as a trailing argument to the adapter. |
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296 // In the general case, this could be the call site's MethodType, |
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297 // for use with java.lang.Invokers.checkExactType, or else a CallSite object. |
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298 // f1 contains the adapter method which manages the actual call. |
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299 // In the general case, this is a compiled LambdaForm. |
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300 // (The Java code is free to optimize these calls by binding other |
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301 // sorts of methods and appendices to call sites.) |
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302 // JVM-level linking is via f1, as if for invokespecial, and signatures are erased. |
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303 // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits. |
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304 // Even with the appendix, the method will never take more than 255 parameter slots. |
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305 // |
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306 // This means that given a call site like (List)mh.invoke("foo"), |
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307 // the f1 method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;', |
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308 // not '(Ljava/lang/String;)Ljava/util/List;'. |
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309 // The fact that String and List are involved is encoded in the MethodType in refs[f2]. |
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310 // This allows us to create fewer method oops, while keeping type safety. |
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311 // |
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312 |
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313 objArrayHandle resolved_references = cpool->resolved_references(); |
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314 // Store appendix, if any. |
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315 if (has_appendix) { |
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316 const int appendix_index = f2_as_index() + _indy_resolved_references_appendix_offset; |
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317 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob"); |
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318 assert(resolved_references->obj_at(appendix_index) == NULL, "init just once"); |
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319 resolved_references->obj_at_put(appendix_index, appendix()); |
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320 } |
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321 |
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322 // Store MethodType, if any. |
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323 if (has_method_type) { |
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324 const int method_type_index = f2_as_index() + _indy_resolved_references_method_type_offset; |
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325 assert(method_type_index >= 0 && method_type_index < resolved_references->length(), "oob"); |
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326 assert(resolved_references->obj_at(method_type_index) == NULL, "init just once"); |
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327 resolved_references->obj_at_put(method_type_index, method_type()); |
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328 } |
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329 |
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330 release_set_f1(adapter()); // This must be the last one to set (see NOTE above)! |
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331 |
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332 // The interpreter assembly code does not check byte_2, |
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333 // but it is used by is_resolved, method_if_resolved, etc. |
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334 set_bytecode_1(invoke_code); |
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335 NOT_PRODUCT(verify(tty)); |
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336 if (TraceInvokeDynamic) { |
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337 this->print(tty, 0); |
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338 } |
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339 } |
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340 |
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341 Method* ConstantPoolCacheEntry::method_if_resolved(constantPoolHandle cpool) { |
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342 // Decode the action of set_method and set_interface_call |
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343 Bytecodes::Code invoke_code = bytecode_1(); |
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344 if (invoke_code != (Bytecodes::Code)0) { |
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345 Metadata* f1 = (Metadata*)_f1; |
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346 if (f1 != NULL) { |
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347 switch (invoke_code) { |
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348 case Bytecodes::_invokeinterface: |
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349 assert(f1->is_klass(), ""); |
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350 return klassItable::method_for_itable_index((Klass*)f1, f2_as_index()); |
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351 case Bytecodes::_invokestatic: |
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352 case Bytecodes::_invokespecial: |
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353 assert(!has_appendix(), ""); |
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354 case Bytecodes::_invokehandle: |
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355 case Bytecodes::_invokedynamic: |
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356 assert(f1->is_method(), ""); |
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357 return (Method*)f1; |
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358 } |
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359 } |
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360 } |
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361 invoke_code = bytecode_2(); |
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362 if (invoke_code != (Bytecodes::Code)0) { |
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363 switch (invoke_code) { |
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364 case Bytecodes::_invokevirtual: |
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365 if (is_vfinal()) { |
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366 // invokevirtual |
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367 Method* m = f2_as_vfinal_method(); |
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368 assert(m->is_method(), ""); |
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369 return m; |
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370 } else { |
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371 int holder_index = cpool->uncached_klass_ref_index_at(constant_pool_index()); |
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372 if (cpool->tag_at(holder_index).is_klass()) { |
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373 Klass* klass = cpool->resolved_klass_at(holder_index); |
6983 | 374 if (!klass->oop_is_instance()) |
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375 klass = SystemDictionary::Object_klass(); |
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376 return InstanceKlass::cast(klass)->method_at_vtable(f2_as_index()); |
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377 } |
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378 } |
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379 break; |
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380 } |
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381 } |
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382 return NULL; |
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383 } |
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384 |
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385 |
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386 oop ConstantPoolCacheEntry::appendix_if_resolved(constantPoolHandle cpool) { |
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387 if (is_f1_null() || !has_appendix()) |
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388 return NULL; |
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389 const int ref_index = f2_as_index() + _indy_resolved_references_appendix_offset; |
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390 objArrayOop resolved_references = cpool->resolved_references(); |
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391 return resolved_references->obj_at(ref_index); |
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392 } |
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393 |
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394 |
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395 oop ConstantPoolCacheEntry::method_type_if_resolved(constantPoolHandle cpool) { |
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396 if (is_f1_null() || !has_method_type()) |
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397 return NULL; |
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398 const int ref_index = f2_as_index() + _indy_resolved_references_method_type_offset; |
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399 objArrayOop resolved_references = cpool->resolved_references(); |
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400 return resolved_references->obj_at(ref_index); |
0 | 401 } |
402 | |
403 | |
404 // RedefineClasses() API support: | |
405 // If this constantPoolCacheEntry refers to old_method then update it | |
406 // to refer to new_method. | |
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407 bool ConstantPoolCacheEntry::adjust_method_entry(Method* old_method, |
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408 Method* new_method, bool * trace_name_printed) { |
0 | 409 |
410 if (is_vfinal()) { | |
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411 // virtual and final so _f2 contains method ptr instead of vtable index |
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412 if (f2_as_vfinal_method() == old_method) { |
0 | 413 // match old_method so need an update |
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414 // NOTE: can't use set_f2_as_vfinal_method as it asserts on different values |
0 | 415 _f2 = (intptr_t)new_method; |
416 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
417 if (!(*trace_name_printed)) { | |
418 // RC_TRACE_MESG macro has an embedded ResourceMark | |
419 RC_TRACE_MESG(("adjust: name=%s", | |
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420 old_method->method_holder()->external_name())); |
0 | 421 *trace_name_printed = true; |
422 } | |
423 // RC_TRACE macro has an embedded ResourceMark | |
424 RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)", | |
425 new_method->name()->as_C_string(), | |
426 new_method->signature()->as_C_string())); | |
427 } | |
428 | |
429 return true; | |
430 } | |
431 | |
432 // f1() is not used with virtual entries so bail out | |
433 return false; | |
434 } | |
435 | |
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436 if (_f1 == NULL) { |
0 | 437 // NULL f1() means this is a virtual entry so bail out |
438 // We are assuming that the vtable index does not need change. | |
439 return false; | |
440 } | |
441 | |
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442 if (_f1 == old_method) { |
0 | 443 _f1 = new_method; |
444 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
445 if (!(*trace_name_printed)) { | |
446 // RC_TRACE_MESG macro has an embedded ResourceMark | |
447 RC_TRACE_MESG(("adjust: name=%s", | |
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448 old_method->method_holder()->external_name())); |
0 | 449 *trace_name_printed = true; |
450 } | |
451 // RC_TRACE macro has an embedded ResourceMark | |
452 RC_TRACE(0x00400000, ("cpc entry update: %s(%s)", | |
453 new_method->name()->as_C_string(), | |
454 new_method->signature()->as_C_string())); | |
455 } | |
456 | |
457 return true; | |
458 } | |
459 | |
460 return false; | |
461 } | |
462 | |
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463 #ifndef PRODUCT |
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464 bool ConstantPoolCacheEntry::check_no_old_entries() { |
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465 if (is_vfinal()) { |
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466 Metadata* f2 = (Metadata*)_f2; |
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467 return (f2->is_valid() && f2->is_method() && !((Method*)f2)->is_old()); |
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468 } else { |
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469 return (_f1 == NULL || (_f1->is_valid() && _f1->is_method() && !((Method*)_f1)->is_old())); |
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470 } |
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471 } |
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472 #endif |
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473 |
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474 bool ConstantPoolCacheEntry::is_interesting_method_entry(Klass* k) { |
0 | 475 if (!is_method_entry()) { |
476 // not a method entry so not interesting by default | |
477 return false; | |
478 } | |
479 | |
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480 Method* m = NULL; |
0 | 481 if (is_vfinal()) { |
482 // virtual and final so _f2 contains method ptr instead of vtable index | |
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483 m = f2_as_vfinal_method(); |
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484 } else if (is_f1_null()) { |
0 | 485 // NULL _f1 means this is a virtual entry so also not interesting |
486 return false; | |
487 } else { | |
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488 if (!(_f1->is_method())) { |
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489 // _f1 can also contain a Klass* for an interface |
0 | 490 return false; |
491 } | |
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492 m = f1_as_method(); |
0 | 493 } |
494 | |
495 assert(m != NULL && m->is_method(), "sanity check"); | |
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496 if (m == NULL || !m->is_method() || (k != NULL && m->method_holder() != k)) { |
0 | 497 // robustness for above sanity checks or method is not in |
498 // the interesting class | |
499 return false; | |
500 } | |
501 | |
502 // the method is in the interesting class so the entry is interesting | |
503 return true; | |
504 } | |
505 | |
506 void ConstantPoolCacheEntry::print(outputStream* st, int index) const { | |
507 // print separator | |
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508 if (index == 0) st->print_cr(" -------------"); |
0 | 509 // print entry |
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510 st->print("%3d ("PTR_FORMAT") ", index, (intptr_t)this); |
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511 st->print_cr("[%02x|%02x|%5d]", bytecode_2(), bytecode_1(), constant_pool_index()); |
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512 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f1); |
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513 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f2); |
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514 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_flags); |
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515 st->print_cr(" -------------"); |
0 | 516 } |
517 | |
518 void ConstantPoolCacheEntry::verify(outputStream* st) const { | |
519 // not implemented yet | |
520 } | |
521 | |
522 // Implementation of ConstantPoolCache | |
523 | |
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524 ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data, int length, TRAPS) { |
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525 int size = ConstantPoolCache::size(length); |
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526 |
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527 return new (loader_data, size, false, THREAD) ConstantPoolCache(length); |
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528 } |
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529 |
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530 void ConstantPoolCache::initialize(intArray& inverse_index_map, intArray& invokedynamic_references_map) { |
0 | 531 assert(inverse_index_map.length() == length(), "inverse index map must have same length as cache"); |
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532 for (int i = 0; i < length(); i++) { |
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533 ConstantPoolCacheEntry* e = entry_at(i); |
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534 int original_index = inverse_index_map[i]; |
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535 e->initialize_entry(original_index); |
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536 assert(entry_at(i) == e, "sanity"); |
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537 } |
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538 for (int ref = 0; ref < invokedynamic_references_map.length(); ref++) { |
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539 const int cpci = invokedynamic_references_map[ref]; |
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540 if (cpci >= 0) { |
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541 #ifdef ASSERT |
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542 // invokedynamic and invokehandle have more entries; check if they |
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543 // all point to the same constant pool cache entry. |
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544 for (int entry = 1; entry < ConstantPoolCacheEntry::_indy_resolved_references_entries; entry++) { |
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545 const int cpci_next = invokedynamic_references_map[ref + entry]; |
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546 assert(cpci == cpci_next, err_msg_res("%d == %d", cpci, cpci_next)); |
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547 } |
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548 #endif |
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549 entry_at(cpci)->initialize_resolved_reference_index(ref); |
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550 ref += ConstantPoolCacheEntry::_indy_resolved_references_entries - 1; // skip extra entries |
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551 } |
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552 } |
0 | 553 } |
554 | |
555 // RedefineClasses() API support: | |
556 // If any entry of this constantPoolCache points to any of | |
557 // old_methods, replace it with the corresponding new_method. | |
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558 void ConstantPoolCache::adjust_method_entries(Method** old_methods, Method** new_methods, |
0 | 559 int methods_length, bool * trace_name_printed) { |
560 | |
561 if (methods_length == 0) { | |
562 // nothing to do if there are no methods | |
563 return; | |
564 } | |
565 | |
566 // get shorthand for the interesting class | |
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567 Klass* old_holder = old_methods[0]->method_holder(); |
0 | 568 |
569 for (int i = 0; i < length(); i++) { | |
570 if (!entry_at(i)->is_interesting_method_entry(old_holder)) { | |
571 // skip uninteresting methods | |
572 continue; | |
573 } | |
574 | |
575 // The constantPoolCache contains entries for several different | |
576 // things, but we only care about methods. In fact, we only care | |
577 // about methods in the same class as the one that contains the | |
578 // old_methods. At this point, we have an interesting entry. | |
579 | |
580 for (int j = 0; j < methods_length; j++) { | |
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581 Method* old_method = old_methods[j]; |
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582 Method* new_method = new_methods[j]; |
0 | 583 |
584 if (entry_at(i)->adjust_method_entry(old_method, new_method, | |
585 trace_name_printed)) { | |
586 // current old_method matched this entry and we updated it so | |
587 // break out and get to the next interesting entry if there one | |
588 break; | |
589 } | |
590 } | |
591 } | |
592 } | |
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593 |
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594 #ifndef PRODUCT |
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595 bool ConstantPoolCache::check_no_old_entries() { |
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596 for (int i = 1; i < length(); i++) { |
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597 if (entry_at(i)->is_interesting_method_entry(NULL) && |
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598 !entry_at(i)->check_no_old_entries()) { |
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599 return false; |
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600 } |
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601 } |
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602 return true; |
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603 } |
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604 #endif // PRODUCT |
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605 |
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606 |
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607 // Printing |
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608 |
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609 void ConstantPoolCache::print_on(outputStream* st) const { |
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610 assert(is_constantPoolCache(), "obj must be constant pool cache"); |
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611 st->print_cr(internal_name()); |
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612 // print constant pool cache entries |
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613 for (int i = 0; i < length(); i++) entry_at(i)->print(st, i); |
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614 } |
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615 |
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616 void ConstantPoolCache::print_value_on(outputStream* st) const { |
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617 assert(is_constantPoolCache(), "obj must be constant pool cache"); |
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618 st->print("cache [%d]", length()); |
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619 print_address_on(st); |
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620 st->print(" for "); |
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621 constant_pool()->print_value_on(st); |
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622 } |
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623 |
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624 |
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625 // Verification |
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626 |
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627 void ConstantPoolCache::verify_on(outputStream* st) { |
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628 guarantee(is_constantPoolCache(), "obj must be constant pool cache"); |
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629 // print constant pool cache entries |
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630 for (int i = 0; i < length(); i++) entry_at(i)->verify(st); |
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631 } |