Mercurial > hg > truffle
annotate src/share/vm/oops/cpCache.cpp @ 20527:8cb56c8cb30d
Merge
author | jiangli |
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date | Mon, 15 Sep 2014 16:39:00 -0400 |
parents | ce8f6bb717c9 |
children | 7848fc12602b |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
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 #include "runtime/orderAccess.inline.hpp" |
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37 #include "utilities/macros.hpp" |
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38 #if INCLUDE_ALL_GCS |
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39 # include "gc_implementation/parallelScavenge/psPromotionManager.hpp" |
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40 #endif // INCLUDE_ALL_GCS |
0 | 41 |
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42 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
0 | 43 |
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44 // Implementation of ConstantPoolCacheEntry |
0 | 45 |
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46 void ConstantPoolCacheEntry::initialize_entry(int index) { |
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47 assert(0 < index && index < 0x10000, "sanity check"); |
0 | 48 _indices = index; |
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49 _f1 = NULL; |
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50 _f2 = _flags = 0; |
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51 assert(constant_pool_index() == index, ""); |
0 | 52 } |
53 | |
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54 int ConstantPoolCacheEntry::make_flags(TosState state, |
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55 int option_bits, |
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56 int field_index_or_method_params) { |
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57 assert(state < number_of_states, "Invalid state in make_flags"); |
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58 int f = ((int)state << tos_state_shift) | option_bits | field_index_or_method_params; |
0 | 59 // Preserve existing flag bit values |
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60 // The low bits are a field offset, or else the method parameter size. |
0 | 61 #ifdef ASSERT |
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62 TosState old_state = flag_state(); |
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63 assert(old_state == (TosState)0 || old_state == state, |
0 | 64 "inconsistent cpCache flags state"); |
65 #endif | |
66 return (_flags | f) ; | |
67 } | |
68 | |
69 void ConstantPoolCacheEntry::set_bytecode_1(Bytecodes::Code code) { | |
70 #ifdef ASSERT | |
71 // Read once. | |
72 volatile Bytecodes::Code c = bytecode_1(); | |
73 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
74 #endif | |
75 // Need to flush pending stores here before bytecode is written. | |
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76 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_1_shift)); |
0 | 77 } |
78 | |
79 void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) { | |
80 #ifdef ASSERT | |
81 // Read once. | |
82 volatile Bytecodes::Code c = bytecode_2(); | |
83 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
84 #endif | |
85 // Need to flush pending stores here before bytecode is written. | |
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86 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_2_shift)); |
0 | 87 } |
88 | |
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89 // Sets f1, ordering with previous writes. |
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90 void ConstantPoolCacheEntry::release_set_f1(Metadata* f1) { |
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91 assert(f1 != NULL, ""); |
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92 OrderAccess::release_store_ptr((HeapWord*) &_f1, f1); |
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93 } |
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94 |
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95 // Sets flags, but only if the value was previously zero. |
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96 bool ConstantPoolCacheEntry::init_flags_atomic(intptr_t flags) { |
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97 intptr_t result = Atomic::cmpxchg_ptr(flags, &_flags, 0); |
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98 return (result == 0); |
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99 } |
1903 | 100 |
0 | 101 // Note that concurrent update of both bytecodes can leave one of them |
102 // reset to zero. This is harmless; the interpreter will simply re-resolve | |
103 // the damaged entry. More seriously, the memory synchronization is needed | |
104 // to flush other fields (f1, f2) completely to memory before the bytecodes | |
105 // are updated, lest other processors see a non-zero bytecode but zero f1/f2. | |
106 void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code, | |
107 Bytecodes::Code put_code, | |
108 KlassHandle field_holder, | |
3938 | 109 int field_index, |
0 | 110 int field_offset, |
111 TosState field_type, | |
112 bool is_final, | |
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113 bool is_volatile, |
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114 Klass* root_klass) { |
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115 set_f1(field_holder()); |
0 | 116 set_f2(field_offset); |
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117 assert((field_index & field_index_mask) == field_index, |
0 | 118 "field index does not fit in low flag bits"); |
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119 set_field_flags(field_type, |
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120 ((is_volatile ? 1 : 0) << is_volatile_shift) | |
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121 ((is_final ? 1 : 0) << is_final_shift), |
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122 field_index); |
0 | 123 set_bytecode_1(get_code); |
124 set_bytecode_2(put_code); | |
125 NOT_PRODUCT(verify(tty)); | |
126 } | |
127 | |
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128 void ConstantPoolCacheEntry::set_parameter_size(int value) { |
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129 // This routine is called only in corner cases where the CPCE is not yet initialized. |
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130 // See AbstractInterpreter::deopt_continue_after_entry. |
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131 assert(_flags == 0 || parameter_size() == 0 || parameter_size() == value, |
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132 err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value)); |
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133 // Setting the parameter size by itself is only safe if the |
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134 // current value of _flags is 0, otherwise another thread may have |
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135 // updated it and we don't want to overwrite that value. Don't |
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136 // bother trying to update it once it's nonzero but always make |
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137 // sure that the final parameter size agrees with what was passed. |
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138 if (_flags == 0) { |
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139 Atomic::cmpxchg_ptr((value & parameter_size_mask), &_flags, 0); |
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140 } |
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141 guarantee(parameter_size() == value, |
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142 err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value)); |
0 | 143 } |
144 | |
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145 void ConstantPoolCacheEntry::set_direct_or_vtable_call(Bytecodes::Code invoke_code, |
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146 methodHandle method, |
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147 int vtable_index) { |
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148 bool is_vtable_call = (vtable_index >= 0); // FIXME: split this method on this boolean |
0 | 149 assert(method->interpreter_entry() != NULL, "should have been set at this point"); |
150 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache"); | |
151 | |
152 int byte_no = -1; | |
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153 bool change_to_virtual = false; |
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154 |
0 | 155 switch (invoke_code) { |
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156 case Bytecodes::_invokeinterface: |
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157 // We get here from InterpreterRuntime::resolve_invoke when an invokeinterface |
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158 // instruction somehow links to a non-interface method (in Object). |
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159 // In that case, the method has no itable index and must be invoked as a virtual. |
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160 // Set a flag to keep track of this corner case. |
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161 change_to_virtual = true; |
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162 |
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163 // ...and fall through as if we were handling invokevirtual: |
0 | 164 case Bytecodes::_invokevirtual: |
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165 { |
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166 if (!is_vtable_call) { |
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167 assert(method->can_be_statically_bound(), ""); |
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168 // set_f2_as_vfinal_method checks if is_vfinal flag is true. |
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169 set_method_flags(as_TosState(method->result_type()), |
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170 ( 1 << is_vfinal_shift) | |
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171 ((method->is_final_method() ? 1 : 0) << is_final_shift) | |
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172 ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift), |
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173 method()->size_of_parameters()); |
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174 set_f2_as_vfinal_method(method()); |
0 | 175 } else { |
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176 assert(!method->can_be_statically_bound(), ""); |
0 | 177 assert(vtable_index >= 0, "valid index"); |
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178 assert(!method->is_final_method(), "sanity"); |
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179 set_method_flags(as_TosState(method->result_type()), |
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180 ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift), |
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181 method()->size_of_parameters()); |
0 | 182 set_f2(vtable_index); |
183 } | |
184 byte_no = 2; | |
185 break; | |
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186 } |
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187 |
0 | 188 case Bytecodes::_invokespecial: |
189 case Bytecodes::_invokestatic: | |
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190 assert(!is_vtable_call, ""); |
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191 // Note: Read and preserve the value of the is_vfinal flag on any |
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192 // invokevirtual bytecode shared with this constant pool cache entry. |
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193 // It is cheap and safe to consult is_vfinal() at all times. |
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194 // Once is_vfinal is set, it must stay that way, lest we get a dangling oop. |
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195 set_method_flags(as_TosState(method->result_type()), |
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196 ((is_vfinal() ? 1 : 0) << is_vfinal_shift) | |
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197 ((method->is_final_method() ? 1 : 0) << is_final_shift), |
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198 method()->size_of_parameters()); |
0 | 199 set_f1(method()); |
200 byte_no = 1; | |
201 break; | |
202 default: | |
203 ShouldNotReachHere(); | |
204 break; | |
205 } | |
206 | |
207 // Note: byte_no also appears in TemplateTable::resolve. | |
208 if (byte_no == 1) { | |
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209 assert(invoke_code != Bytecodes::_invokevirtual && |
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210 invoke_code != Bytecodes::_invokeinterface, ""); |
0 | 211 set_bytecode_1(invoke_code); |
212 } else if (byte_no == 2) { | |
213 if (change_to_virtual) { | |
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214 assert(invoke_code == Bytecodes::_invokeinterface, ""); |
0 | 215 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!! |
216 // | |
217 // Workaround for the case where we encounter an invokeinterface, but we | |
218 // should really have an _invokevirtual since the resolved method is a | |
219 // virtual method in java.lang.Object. This is a corner case in the spec | |
220 // but is presumably legal. javac does not generate this code. | |
221 // | |
222 // We set bytecode_1() to _invokeinterface, because that is the | |
223 // bytecode # used by the interpreter to see if it is resolved. | |
224 // We set bytecode_2() to _invokevirtual. | |
225 // See also interpreterRuntime.cpp. (8/25/2000) | |
226 // Only set resolved for the invokeinterface case if method is public. | |
227 // Otherwise, the method needs to be reresolved with caller for each | |
228 // interface call. | |
229 if (method->is_public()) set_bytecode_1(invoke_code); | |
230 } else { | |
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231 assert(invoke_code == Bytecodes::_invokevirtual, ""); |
0 | 232 } |
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233 // set up for invokevirtual, even if linking for invokeinterface also: |
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234 set_bytecode_2(Bytecodes::_invokevirtual); |
0 | 235 } else { |
236 ShouldNotReachHere(); | |
237 } | |
238 NOT_PRODUCT(verify(tty)); | |
239 } | |
240 | |
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241 void ConstantPoolCacheEntry::set_direct_call(Bytecodes::Code invoke_code, methodHandle method) { |
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242 int index = Method::nonvirtual_vtable_index; |
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243 // index < 0; FIXME: inline and customize set_direct_or_vtable_call |
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244 set_direct_or_vtable_call(invoke_code, method, index); |
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245 } |
0 | 246 |
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247 void ConstantPoolCacheEntry::set_vtable_call(Bytecodes::Code invoke_code, methodHandle method, int index) { |
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248 // either the method is a miranda or its holder should accept the given index |
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249 assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), ""); |
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250 // index >= 0; FIXME: inline and customize set_direct_or_vtable_call |
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251 set_direct_or_vtable_call(invoke_code, method, index); |
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252 } |
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253 |
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254 void ConstantPoolCacheEntry::set_itable_call(Bytecodes::Code invoke_code, methodHandle method, int index) { |
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255 assert(method->method_holder()->verify_itable_index(index), ""); |
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256 assert(invoke_code == Bytecodes::_invokeinterface, ""); |
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257 InstanceKlass* interf = method->method_holder(); |
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258 assert(interf->is_interface(), "must be an interface"); |
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259 assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here"); |
0 | 260 set_f1(interf); |
261 set_f2(index); | |
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262 set_method_flags(as_TosState(method->result_type()), |
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263 0, // no option bits |
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264 method()->size_of_parameters()); |
0 | 265 set_bytecode_1(Bytecodes::_invokeinterface); |
266 } | |
267 | |
268 | |
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269 void ConstantPoolCacheEntry::set_method_handle(constantPoolHandle cpool, const CallInfo &call_info) { |
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270 set_method_handle_common(cpool, Bytecodes::_invokehandle, call_info); |
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271 } |
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272 |
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273 void ConstantPoolCacheEntry::set_dynamic_call(constantPoolHandle cpool, const CallInfo &call_info) { |
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274 set_method_handle_common(cpool, Bytecodes::_invokedynamic, call_info); |
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275 } |
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276 |
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277 void ConstantPoolCacheEntry::set_method_handle_common(constantPoolHandle cpool, |
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278 Bytecodes::Code invoke_code, |
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279 const CallInfo &call_info) { |
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280 // NOTE: This CPCE can be the subject of data races. |
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281 // There are three words to update: flags, refs[f2], f1 (in that order). |
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282 // Writers must store all other values before f1. |
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283 // Readers must test f1 first for non-null before reading other fields. |
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284 // Competing writers must acquire exclusive access via a lock. |
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285 // A losing writer waits on the lock until the winner writes f1 and leaves |
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286 // the lock, so that when the losing writer returns, he can use the linked |
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287 // cache entry. |
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288 |
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289 MonitorLockerEx ml(cpool->lock()); |
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290 if (!is_f1_null()) { |
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291 return; |
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292 } |
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293 |
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294 const methodHandle adapter = call_info.resolved_method(); |
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295 const Handle appendix = call_info.resolved_appendix(); |
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296 const Handle method_type = call_info.resolved_method_type(); |
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297 const bool has_appendix = appendix.not_null(); |
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298 const bool has_method_type = method_type.not_null(); |
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299 |
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300 // Write the flags. |
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301 set_method_flags(as_TosState(adapter->result_type()), |
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302 ((has_appendix ? 1 : 0) << has_appendix_shift ) | |
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303 ((has_method_type ? 1 : 0) << has_method_type_shift) | |
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304 ( 1 << is_final_shift ), |
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305 adapter->size_of_parameters()); |
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306 |
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307 if (TraceInvokeDynamic) { |
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308 tty->print_cr("set_method_handle bc=%d appendix="PTR_FORMAT"%s method_type="PTR_FORMAT"%s method="PTR_FORMAT" ", |
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309 invoke_code, |
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310 (void *)appendix(), (has_appendix ? "" : " (unused)"), |
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311 (void *)method_type(), (has_method_type ? "" : " (unused)"), |
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312 (intptr_t)adapter()); |
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313 adapter->print(); |
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314 if (has_appendix) appendix()->print(); |
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315 } |
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316 |
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317 // Method handle invokes and invokedynamic sites use both cp cache words. |
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318 // refs[f2], if not null, contains a value passed as a trailing argument to the adapter. |
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319 // In the general case, this could be the call site's MethodType, |
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320 // for use with java.lang.Invokers.checkExactType, or else a CallSite object. |
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321 // f1 contains the adapter method which manages the actual call. |
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322 // In the general case, this is a compiled LambdaForm. |
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323 // (The Java code is free to optimize these calls by binding other |
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324 // sorts of methods and appendices to call sites.) |
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325 // JVM-level linking is via f1, as if for invokespecial, and signatures are erased. |
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326 // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits. |
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327 // Even with the appendix, the method will never take more than 255 parameter slots. |
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328 // |
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329 // This means that given a call site like (List)mh.invoke("foo"), |
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330 // the f1 method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;', |
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331 // not '(Ljava/lang/String;)Ljava/util/List;'. |
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332 // The fact that String and List are involved is encoded in the MethodType in refs[f2]. |
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333 // This allows us to create fewer method oops, while keeping type safety. |
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334 // |
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335 |
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336 objArrayHandle resolved_references = cpool->resolved_references(); |
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337 // Store appendix, if any. |
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338 if (has_appendix) { |
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339 const int appendix_index = f2_as_index() + _indy_resolved_references_appendix_offset; |
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340 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob"); |
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341 assert(resolved_references->obj_at(appendix_index) == NULL, "init just once"); |
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342 resolved_references->obj_at_put(appendix_index, appendix()); |
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343 } |
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344 |
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345 // Store MethodType, if any. |
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346 if (has_method_type) { |
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347 const int method_type_index = f2_as_index() + _indy_resolved_references_method_type_offset; |
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348 assert(method_type_index >= 0 && method_type_index < resolved_references->length(), "oob"); |
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349 assert(resolved_references->obj_at(method_type_index) == NULL, "init just once"); |
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350 resolved_references->obj_at_put(method_type_index, method_type()); |
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351 } |
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352 |
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353 release_set_f1(adapter()); // This must be the last one to set (see NOTE above)! |
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354 |
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355 // The interpreter assembly code does not check byte_2, |
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356 // but it is used by is_resolved, method_if_resolved, etc. |
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357 set_bytecode_1(invoke_code); |
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358 NOT_PRODUCT(verify(tty)); |
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359 if (TraceInvokeDynamic) { |
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360 this->print(tty, 0); |
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361 } |
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362 } |
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363 |
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364 Method* ConstantPoolCacheEntry::method_if_resolved(constantPoolHandle cpool) { |
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365 // Decode the action of set_method and set_interface_call |
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366 Bytecodes::Code invoke_code = bytecode_1(); |
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367 if (invoke_code != (Bytecodes::Code)0) { |
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368 Metadata* f1 = f1_ord(); |
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369 if (f1 != NULL) { |
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370 switch (invoke_code) { |
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371 case Bytecodes::_invokeinterface: |
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372 assert(f1->is_klass(), ""); |
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373 return klassItable::method_for_itable_index((Klass*)f1, f2_as_index()); |
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374 case Bytecodes::_invokestatic: |
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375 case Bytecodes::_invokespecial: |
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376 assert(!has_appendix(), ""); |
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377 case Bytecodes::_invokehandle: |
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378 case Bytecodes::_invokedynamic: |
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379 assert(f1->is_method(), ""); |
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380 return (Method*)f1; |
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381 } |
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382 } |
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383 } |
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384 invoke_code = bytecode_2(); |
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385 if (invoke_code != (Bytecodes::Code)0) { |
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386 switch (invoke_code) { |
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387 case Bytecodes::_invokevirtual: |
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388 if (is_vfinal()) { |
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389 // invokevirtual |
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390 Method* m = f2_as_vfinal_method(); |
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391 assert(m->is_method(), ""); |
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392 return m; |
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393 } else { |
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394 int holder_index = cpool->uncached_klass_ref_index_at(constant_pool_index()); |
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395 if (cpool->tag_at(holder_index).is_klass()) { |
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396 Klass* klass = cpool->resolved_klass_at(holder_index); |
6983 | 397 if (!klass->oop_is_instance()) |
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398 klass = SystemDictionary::Object_klass(); |
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399 return InstanceKlass::cast(klass)->method_at_vtable(f2_as_index()); |
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400 } |
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401 } |
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402 break; |
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403 } |
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404 } |
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405 return NULL; |
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406 } |
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407 |
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408 |
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409 oop ConstantPoolCacheEntry::appendix_if_resolved(constantPoolHandle cpool) { |
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410 if (!has_appendix()) |
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411 return NULL; |
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412 const int ref_index = f2_as_index() + _indy_resolved_references_appendix_offset; |
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413 objArrayOop resolved_references = cpool->resolved_references(); |
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414 return resolved_references->obj_at(ref_index); |
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415 } |
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416 |
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417 |
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418 oop ConstantPoolCacheEntry::method_type_if_resolved(constantPoolHandle cpool) { |
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419 if (!has_method_type()) |
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420 return NULL; |
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421 const int ref_index = f2_as_index() + _indy_resolved_references_method_type_offset; |
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422 objArrayOop resolved_references = cpool->resolved_references(); |
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423 return resolved_references->obj_at(ref_index); |
0 | 424 } |
425 | |
426 | |
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427 #if INCLUDE_JVMTI |
0 | 428 // RedefineClasses() API support: |
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429 // If this ConstantPoolCacheEntry refers to old_method then update it |
0 | 430 // to refer to new_method. |
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431 bool ConstantPoolCacheEntry::adjust_method_entry(Method* old_method, |
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432 Method* new_method, bool * trace_name_printed) { |
0 | 433 |
434 if (is_vfinal()) { | |
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435 // virtual and final so _f2 contains method ptr instead of vtable index |
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436 if (f2_as_vfinal_method() == old_method) { |
0 | 437 // match old_method so need an update |
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438 // NOTE: can't use set_f2_as_vfinal_method as it asserts on different values |
0 | 439 _f2 = (intptr_t)new_method; |
440 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
441 if (!(*trace_name_printed)) { | |
442 // RC_TRACE_MESG macro has an embedded ResourceMark | |
443 RC_TRACE_MESG(("adjust: name=%s", | |
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444 old_method->method_holder()->external_name())); |
0 | 445 *trace_name_printed = true; |
446 } | |
447 // RC_TRACE macro has an embedded ResourceMark | |
448 RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)", | |
449 new_method->name()->as_C_string(), | |
450 new_method->signature()->as_C_string())); | |
451 } | |
452 | |
453 return true; | |
454 } | |
455 | |
456 // f1() is not used with virtual entries so bail out | |
457 return false; | |
458 } | |
459 | |
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460 if (_f1 == NULL) { |
0 | 461 // NULL f1() means this is a virtual entry so bail out |
462 // We are assuming that the vtable index does not need change. | |
463 return false; | |
464 } | |
465 | |
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466 if (_f1 == old_method) { |
0 | 467 _f1 = new_method; |
468 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
469 if (!(*trace_name_printed)) { | |
470 // RC_TRACE_MESG macro has an embedded ResourceMark | |
471 RC_TRACE_MESG(("adjust: name=%s", | |
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472 old_method->method_holder()->external_name())); |
0 | 473 *trace_name_printed = true; |
474 } | |
475 // RC_TRACE macro has an embedded ResourceMark | |
476 RC_TRACE(0x00400000, ("cpc entry update: %s(%s)", | |
477 new_method->name()->as_C_string(), | |
478 new_method->signature()->as_C_string())); | |
479 } | |
480 | |
481 return true; | |
482 } | |
483 | |
484 return false; | |
485 } | |
486 | |
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487 // a constant pool cache entry should never contain old or obsolete methods |
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488 bool ConstantPoolCacheEntry::check_no_old_or_obsolete_entries() { |
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489 if (is_vfinal()) { |
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490 // virtual and final so _f2 contains method ptr instead of vtable index |
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491 Metadata* f2 = (Metadata*)_f2; |
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492 // Return false if _f2 refers to an old or an obsolete method. |
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493 // _f2 == NULL || !_f2->is_method() are just as unexpected here. |
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494 return (f2 != NULL NOT_PRODUCT(&& f2->is_valid()) && f2->is_method() && |
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495 !((Method*)f2)->is_old() && !((Method*)f2)->is_obsolete()); |
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496 } else if (_f1 == NULL || |
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497 (NOT_PRODUCT(_f1->is_valid() &&) !_f1->is_method())) { |
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498 // _f1 == NULL || !_f1->is_method() are OK here |
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499 return true; |
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500 } |
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501 // return false if _f1 refers to an old or an obsolete method |
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502 return (NOT_PRODUCT(_f1->is_valid() &&) _f1->is_method() && |
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503 !((Method*)_f1)->is_old() && !((Method*)_f1)->is_obsolete()); |
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504 } |
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505 |
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506 bool ConstantPoolCacheEntry::is_interesting_method_entry(Klass* k) { |
0 | 507 if (!is_method_entry()) { |
508 // not a method entry so not interesting by default | |
509 return false; | |
510 } | |
511 | |
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512 Method* m = NULL; |
0 | 513 if (is_vfinal()) { |
514 // virtual and final so _f2 contains method ptr instead of vtable index | |
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515 m = f2_as_vfinal_method(); |
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516 } else if (is_f1_null()) { |
0 | 517 // NULL _f1 means this is a virtual entry so also not interesting |
518 return false; | |
519 } else { | |
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520 if (!(_f1->is_method())) { |
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521 // _f1 can also contain a Klass* for an interface |
0 | 522 return false; |
523 } | |
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524 m = f1_as_method(); |
0 | 525 } |
526 | |
527 assert(m != NULL && m->is_method(), "sanity check"); | |
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528 if (m == NULL || !m->is_method() || (k != NULL && m->method_holder() != k)) { |
0 | 529 // robustness for above sanity checks or method is not in |
530 // the interesting class | |
531 return false; | |
532 } | |
533 | |
534 // the method is in the interesting class so the entry is interesting | |
535 return true; | |
536 } | |
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537 #endif // INCLUDE_JVMTI |
0 | 538 |
539 void ConstantPoolCacheEntry::print(outputStream* st, int index) const { | |
540 // print separator | |
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541 if (index == 0) st->print_cr(" -------------"); |
0 | 542 // print entry |
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543 st->print("%3d ("PTR_FORMAT") ", index, (intptr_t)this); |
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544 st->print_cr("[%02x|%02x|%5d]", bytecode_2(), bytecode_1(), |
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545 constant_pool_index()); |
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546 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f1); |
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547 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f2); |
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548 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_flags); |
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549 st->print_cr(" -------------"); |
0 | 550 } |
551 | |
552 void ConstantPoolCacheEntry::verify(outputStream* st) const { | |
553 // not implemented yet | |
554 } | |
555 | |
556 // Implementation of ConstantPoolCache | |
557 | |
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558 ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data, |
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559 const intStack& index_map, |
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560 const intStack& invokedynamic_index_map, |
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561 const intStack& invokedynamic_map, TRAPS) { |
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562 |
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563 const int length = index_map.length() + invokedynamic_index_map.length(); |
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564 int size = ConstantPoolCache::size(length); |
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565 |
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566 return new (loader_data, size, false, MetaspaceObj::ConstantPoolCacheType, THREAD) |
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567 ConstantPoolCache(length, index_map, invokedynamic_index_map, invokedynamic_map); |
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568 } |
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569 |
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570 void ConstantPoolCache::initialize(const intArray& inverse_index_map, |
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571 const intArray& invokedynamic_inverse_index_map, |
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572 const intArray& invokedynamic_references_map) { |
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573 for (int i = 0; i < inverse_index_map.length(); i++) { |
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574 ConstantPoolCacheEntry* e = entry_at(i); |
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575 int original_index = inverse_index_map[i]; |
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576 e->initialize_entry(original_index); |
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577 assert(entry_at(i) == e, "sanity"); |
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578 } |
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579 |
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580 // Append invokedynamic entries at the end |
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581 int invokedynamic_offset = inverse_index_map.length(); |
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582 for (int i = 0; i < invokedynamic_inverse_index_map.length(); i++) { |
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583 int offset = i + invokedynamic_offset; |
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584 ConstantPoolCacheEntry* e = entry_at(offset); |
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585 int original_index = invokedynamic_inverse_index_map[i]; |
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586 e->initialize_entry(original_index); |
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587 assert(entry_at(offset) == e, "sanity"); |
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588 } |
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589 |
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590 for (int ref = 0; ref < invokedynamic_references_map.length(); ref++) { |
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591 const int cpci = invokedynamic_references_map[ref]; |
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592 if (cpci >= 0) { |
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593 #ifdef ASSERT |
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594 // invokedynamic and invokehandle have more entries; check if they |
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595 // all point to the same constant pool cache entry. |
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596 for (int entry = 1; entry < ConstantPoolCacheEntry::_indy_resolved_references_entries; entry++) { |
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597 const int cpci_next = invokedynamic_references_map[ref + entry]; |
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598 assert(cpci == cpci_next, err_msg_res("%d == %d", cpci, cpci_next)); |
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599 } |
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600 #endif |
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601 entry_at(cpci)->initialize_resolved_reference_index(ref); |
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602 ref += ConstantPoolCacheEntry::_indy_resolved_references_entries - 1; // skip extra entries |
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603 } |
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604 } |
0 | 605 } |
606 | |
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607 #if INCLUDE_JVMTI |
0 | 608 // RedefineClasses() API support: |
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609 // If any entry of this ConstantPoolCache points to any of |
0 | 610 // old_methods, replace it with the corresponding new_method. |
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611 void ConstantPoolCache::adjust_method_entries(Method** old_methods, Method** new_methods, |
0 | 612 int methods_length, bool * trace_name_printed) { |
613 | |
614 if (methods_length == 0) { | |
615 // nothing to do if there are no methods | |
616 return; | |
617 } | |
618 | |
619 // get shorthand for the interesting class | |
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620 Klass* old_holder = old_methods[0]->method_holder(); |
0 | 621 |
622 for (int i = 0; i < length(); i++) { | |
623 if (!entry_at(i)->is_interesting_method_entry(old_holder)) { | |
624 // skip uninteresting methods | |
625 continue; | |
626 } | |
627 | |
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628 // The ConstantPoolCache contains entries for several different |
0 | 629 // things, but we only care about methods. In fact, we only care |
630 // about methods in the same class as the one that contains the | |
631 // old_methods. At this point, we have an interesting entry. | |
632 | |
633 for (int j = 0; j < methods_length; j++) { | |
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634 Method* old_method = old_methods[j]; |
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635 Method* new_method = new_methods[j]; |
0 | 636 |
637 if (entry_at(i)->adjust_method_entry(old_method, new_method, | |
638 trace_name_printed)) { | |
639 // current old_method matched this entry and we updated it so | |
640 // break out and get to the next interesting entry if there one | |
641 break; | |
642 } | |
643 } | |
644 } | |
645 } | |
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646 |
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647 // the constant pool cache should never contain old or obsolete methods |
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648 bool ConstantPoolCache::check_no_old_or_obsolete_entries() { |
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649 for (int i = 1; i < length(); i++) { |
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650 if (entry_at(i)->is_interesting_method_entry(NULL) && |
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651 !entry_at(i)->check_no_old_or_obsolete_entries()) { |
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652 return false; |
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653 } |
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654 } |
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655 return true; |
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656 } |
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657 |
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658 void ConstantPoolCache::dump_cache() { |
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659 for (int i = 1; i < length(); i++) { |
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660 if (entry_at(i)->is_interesting_method_entry(NULL)) { |
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661 entry_at(i)->print(tty, i); |
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662 } |
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663 } |
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664 } |
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665 #endif // INCLUDE_JVMTI |
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666 |
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667 |
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668 // Printing |
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669 |
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670 void ConstantPoolCache::print_on(outputStream* st) const { |
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671 assert(is_constantPoolCache(), "obj must be constant pool cache"); |
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672 st->print_cr("%s", internal_name()); |
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673 // print constant pool cache entries |
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674 for (int i = 0; i < length(); i++) entry_at(i)->print(st, i); |
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675 } |
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676 |
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677 void ConstantPoolCache::print_value_on(outputStream* st) const { |
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678 assert(is_constantPoolCache(), "obj must be constant pool cache"); |
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679 st->print("cache [%d]", length()); |
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680 print_address_on(st); |
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681 st->print(" for "); |
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682 constant_pool()->print_value_on(st); |
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683 } |
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684 |
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685 |
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686 // Verification |
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687 |
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688 void ConstantPoolCache::verify_on(outputStream* st) { |
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689 guarantee(is_constantPoolCache(), "obj must be constant pool cache"); |
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690 // print constant pool cache entries |
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691 for (int i = 0; i < length(); i++) entry_at(i)->verify(st); |
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692 } |