Mercurial > hg > truffle
annotate src/share/vm/oops/cpCache.cpp @ 15814:066ed90d15a7
[inlining] another renaming to avoid misleading type suggestion (1 of 2)
author | Miguel Garcia <miguel.m.garcia@oracle.com> |
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date | Tue, 20 May 2014 15:45:07 +0200 |
parents | 4ca6dc0799b6 |
children | 52b4284cb496 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
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 "utilities/macros.hpp" |
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37 #if INCLUDE_ALL_GCS |
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38 # include "gc_implementation/parallelScavenge/psPromotionManager.hpp" |
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39 #endif // INCLUDE_ALL_GCS |
0 | 40 |
41 | |
42 // Implememtation of ConstantPoolCacheEntry | |
43 | |
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44 void ConstantPoolCacheEntry::initialize_entry(int index) { |
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45 assert(0 < index && index < 0x10000, "sanity check"); |
0 | 46 _indices = index; |
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47 _f1 = NULL; |
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48 _f2 = _flags = 0; |
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49 assert(constant_pool_index() == index, ""); |
0 | 50 } |
51 | |
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52 int ConstantPoolCacheEntry::make_flags(TosState state, |
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53 int option_bits, |
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54 int field_index_or_method_params) { |
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55 assert(state < number_of_states, "Invalid state in make_flags"); |
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56 int f = ((int)state << tos_state_shift) | option_bits | field_index_or_method_params; |
0 | 57 // Preserve existing flag bit values |
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58 // The low bits are a field offset, or else the method parameter size. |
0 | 59 #ifdef ASSERT |
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60 TosState old_state = flag_state(); |
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61 assert(old_state == (TosState)0 || old_state == state, |
0 | 62 "inconsistent cpCache flags state"); |
63 #endif | |
64 return (_flags | f) ; | |
65 } | |
66 | |
67 void ConstantPoolCacheEntry::set_bytecode_1(Bytecodes::Code code) { | |
68 #ifdef ASSERT | |
69 // Read once. | |
70 volatile Bytecodes::Code c = bytecode_1(); | |
71 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
72 #endif | |
73 // Need to flush pending stores here before bytecode is written. | |
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74 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_1_shift)); |
0 | 75 } |
76 | |
77 void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) { | |
78 #ifdef ASSERT | |
79 // Read once. | |
80 volatile Bytecodes::Code c = bytecode_2(); | |
81 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
82 #endif | |
83 // Need to flush pending stores here before bytecode is written. | |
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84 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_2_shift)); |
0 | 85 } |
86 | |
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87 // Sets f1, ordering with previous writes. |
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88 void ConstantPoolCacheEntry::release_set_f1(Metadata* f1) { |
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89 assert(f1 != NULL, ""); |
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90 OrderAccess::release_store_ptr((HeapWord*) &_f1, f1); |
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91 } |
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92 |
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93 // Sets flags, but only if the value was previously zero. |
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94 bool ConstantPoolCacheEntry::init_flags_atomic(intptr_t flags) { |
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95 intptr_t result = Atomic::cmpxchg_ptr(flags, &_flags, 0); |
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96 return (result == 0); |
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97 } |
1903 | 98 |
0 | 99 // Note that concurrent update of both bytecodes can leave one of them |
100 // reset to zero. This is harmless; the interpreter will simply re-resolve | |
101 // the damaged entry. More seriously, the memory synchronization is needed | |
102 // to flush other fields (f1, f2) completely to memory before the bytecodes | |
103 // are updated, lest other processors see a non-zero bytecode but zero f1/f2. | |
104 void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code, | |
105 Bytecodes::Code put_code, | |
106 KlassHandle field_holder, | |
3938 | 107 int field_index, |
0 | 108 int field_offset, |
109 TosState field_type, | |
110 bool is_final, | |
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111 bool is_volatile, |
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112 Klass* root_klass) { |
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113 set_f1(field_holder()); |
0 | 114 set_f2(field_offset); |
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115 assert((field_index & field_index_mask) == field_index, |
0 | 116 "field index does not fit in low flag bits"); |
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117 set_field_flags(field_type, |
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118 ((is_volatile ? 1 : 0) << is_volatile_shift) | |
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119 ((is_final ? 1 : 0) << is_final_shift), |
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120 field_index); |
0 | 121 set_bytecode_1(get_code); |
122 set_bytecode_2(put_code); | |
123 NOT_PRODUCT(verify(tty)); | |
124 } | |
125 | |
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126 void ConstantPoolCacheEntry::set_parameter_size(int value) { |
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127 // This routine is called only in corner cases where the CPCE is not yet initialized. |
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128 // See AbstractInterpreter::deopt_continue_after_entry. |
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129 assert(_flags == 0 || parameter_size() == 0 || parameter_size() == value, |
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130 err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value)); |
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131 // Setting the parameter size by itself is only safe if the |
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132 // current value of _flags is 0, otherwise another thread may have |
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133 // updated it and we don't want to overwrite that value. Don't |
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134 // bother trying to update it once it's nonzero but always make |
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135 // sure that the final parameter size agrees with what was passed. |
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136 if (_flags == 0) { |
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137 Atomic::cmpxchg_ptr((value & parameter_size_mask), &_flags, 0); |
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138 } |
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139 guarantee(parameter_size() == value, |
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140 err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value)); |
0 | 141 } |
142 | |
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143 void ConstantPoolCacheEntry::set_direct_or_vtable_call(Bytecodes::Code invoke_code, |
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144 methodHandle method, |
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145 int vtable_index) { |
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146 bool is_vtable_call = (vtable_index >= 0); // FIXME: split this method on this boolean |
0 | 147 assert(method->interpreter_entry() != NULL, "should have been set at this point"); |
148 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache"); | |
149 | |
150 int byte_no = -1; | |
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151 bool change_to_virtual = false; |
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152 |
0 | 153 switch (invoke_code) { |
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154 case Bytecodes::_invokeinterface: |
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155 // We get here from InterpreterRuntime::resolve_invoke when an invokeinterface |
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156 // instruction somehow links to a non-interface method (in Object). |
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157 // In that case, the method has no itable index and must be invoked as a virtual. |
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158 // Set a flag to keep track of this corner case. |
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159 change_to_virtual = true; |
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160 |
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161 // ...and fall through as if we were handling invokevirtual: |
0 | 162 case Bytecodes::_invokevirtual: |
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163 { |
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164 if (!is_vtable_call) { |
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165 assert(method->can_be_statically_bound(), ""); |
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166 // set_f2_as_vfinal_method checks if is_vfinal flag is true. |
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167 set_method_flags(as_TosState(method->result_type()), |
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168 ( 1 << is_vfinal_shift) | |
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169 ((method->is_final_method() ? 1 : 0) << is_final_shift) | |
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170 ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift), |
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171 method()->size_of_parameters()); |
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172 set_f2_as_vfinal_method(method()); |
0 | 173 } else { |
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174 assert(!method->can_be_statically_bound(), ""); |
0 | 175 assert(vtable_index >= 0, "valid index"); |
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176 assert(!method->is_final_method(), "sanity"); |
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177 set_method_flags(as_TosState(method->result_type()), |
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178 ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift), |
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179 method()->size_of_parameters()); |
0 | 180 set_f2(vtable_index); |
181 } | |
182 byte_no = 2; | |
183 break; | |
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184 } |
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185 |
0 | 186 case Bytecodes::_invokespecial: |
187 case Bytecodes::_invokestatic: | |
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188 assert(!is_vtable_call, ""); |
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189 // Note: Read and preserve the value of the is_vfinal flag on any |
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190 // invokevirtual bytecode shared with this constant pool cache entry. |
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191 // It is cheap and safe to consult is_vfinal() at all times. |
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192 // Once is_vfinal is set, it must stay that way, lest we get a dangling oop. |
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193 set_method_flags(as_TosState(method->result_type()), |
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194 ((is_vfinal() ? 1 : 0) << is_vfinal_shift) | |
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195 ((method->is_final_method() ? 1 : 0) << is_final_shift), |
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196 method()->size_of_parameters()); |
0 | 197 set_f1(method()); |
198 byte_no = 1; | |
199 break; | |
200 default: | |
201 ShouldNotReachHere(); | |
202 break; | |
203 } | |
204 | |
205 // Note: byte_no also appears in TemplateTable::resolve. | |
206 if (byte_no == 1) { | |
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207 assert(invoke_code != Bytecodes::_invokevirtual && |
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208 invoke_code != Bytecodes::_invokeinterface, ""); |
0 | 209 set_bytecode_1(invoke_code); |
210 } else if (byte_no == 2) { | |
211 if (change_to_virtual) { | |
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212 assert(invoke_code == Bytecodes::_invokeinterface, ""); |
0 | 213 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!! |
214 // | |
215 // Workaround for the case where we encounter an invokeinterface, but we | |
216 // should really have an _invokevirtual since the resolved method is a | |
217 // virtual method in java.lang.Object. This is a corner case in the spec | |
218 // but is presumably legal. javac does not generate this code. | |
219 // | |
220 // We set bytecode_1() to _invokeinterface, because that is the | |
221 // bytecode # used by the interpreter to see if it is resolved. | |
222 // We set bytecode_2() to _invokevirtual. | |
223 // See also interpreterRuntime.cpp. (8/25/2000) | |
224 // Only set resolved for the invokeinterface case if method is public. | |
225 // Otherwise, the method needs to be reresolved with caller for each | |
226 // interface call. | |
227 if (method->is_public()) set_bytecode_1(invoke_code); | |
228 } else { | |
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229 assert(invoke_code == Bytecodes::_invokevirtual, ""); |
0 | 230 } |
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231 // set up for invokevirtual, even if linking for invokeinterface also: |
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232 set_bytecode_2(Bytecodes::_invokevirtual); |
0 | 233 } else { |
234 ShouldNotReachHere(); | |
235 } | |
236 NOT_PRODUCT(verify(tty)); | |
237 } | |
238 | |
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239 void ConstantPoolCacheEntry::set_direct_call(Bytecodes::Code invoke_code, methodHandle method) { |
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240 int index = Method::nonvirtual_vtable_index; |
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241 // index < 0; FIXME: inline and customize set_direct_or_vtable_call |
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242 set_direct_or_vtable_call(invoke_code, method, index); |
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243 } |
0 | 244 |
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245 void ConstantPoolCacheEntry::set_vtable_call(Bytecodes::Code invoke_code, methodHandle method, int index) { |
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246 // either the method is a miranda or its holder should accept the given index |
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247 assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), ""); |
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248 // index >= 0; FIXME: inline and customize set_direct_or_vtable_call |
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249 set_direct_or_vtable_call(invoke_code, method, index); |
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250 } |
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251 |
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252 void ConstantPoolCacheEntry::set_itable_call(Bytecodes::Code invoke_code, methodHandle method, int index) { |
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253 assert(method->method_holder()->verify_itable_index(index), ""); |
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254 assert(invoke_code == Bytecodes::_invokeinterface, ""); |
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255 InstanceKlass* interf = method->method_holder(); |
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256 assert(interf->is_interface(), "must be an interface"); |
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257 assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here"); |
0 | 258 set_f1(interf); |
259 set_f2(index); | |
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260 set_method_flags(as_TosState(method->result_type()), |
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261 0, // no option bits |
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262 method()->size_of_parameters()); |
0 | 263 set_bytecode_1(Bytecodes::_invokeinterface); |
264 } | |
265 | |
266 | |
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267 void ConstantPoolCacheEntry::set_method_handle(constantPoolHandle cpool, const CallInfo &call_info) { |
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268 set_method_handle_common(cpool, Bytecodes::_invokehandle, call_info); |
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269 } |
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270 |
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271 void ConstantPoolCacheEntry::set_dynamic_call(constantPoolHandle cpool, const CallInfo &call_info) { |
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272 set_method_handle_common(cpool, Bytecodes::_invokedynamic, call_info); |
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273 } |
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274 |
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275 void ConstantPoolCacheEntry::set_method_handle_common(constantPoolHandle cpool, |
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276 Bytecodes::Code invoke_code, |
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277 const CallInfo &call_info) { |
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278 // NOTE: This CPCE can be the subject of data races. |
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279 // There are three words to update: flags, refs[f2], f1 (in that order). |
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280 // Writers must store all other values before f1. |
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281 // Readers must test f1 first for non-null before reading other fields. |
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282 // Competing writers must acquire exclusive access via a lock. |
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283 // A losing writer waits on the lock until the winner writes f1 and leaves |
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284 // the lock, so that when the losing writer returns, he can use the linked |
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285 // cache entry. |
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286 |
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287 MonitorLockerEx ml(cpool->lock()); |
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288 if (!is_f1_null()) { |
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289 return; |
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290 } |
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291 |
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292 const methodHandle adapter = call_info.resolved_method(); |
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293 const Handle appendix = call_info.resolved_appendix(); |
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294 const Handle method_type = call_info.resolved_method_type(); |
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295 const bool has_appendix = appendix.not_null(); |
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296 const bool has_method_type = method_type.not_null(); |
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297 |
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298 // Write the flags. |
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299 set_method_flags(as_TosState(adapter->result_type()), |
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300 ((has_appendix ? 1 : 0) << has_appendix_shift ) | |
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301 ((has_method_type ? 1 : 0) << has_method_type_shift) | |
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302 ( 1 << is_final_shift ), |
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303 adapter->size_of_parameters()); |
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304 |
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305 if (TraceInvokeDynamic) { |
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306 tty->print_cr("set_method_handle bc=%d appendix="PTR_FORMAT"%s method_type="PTR_FORMAT"%s method="PTR_FORMAT" ", |
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307 invoke_code, |
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308 (void *)appendix(), (has_appendix ? "" : " (unused)"), |
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309 (void *)method_type(), (has_method_type ? "" : " (unused)"), |
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310 (intptr_t)adapter()); |
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311 adapter->print(); |
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312 if (has_appendix) appendix()->print(); |
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313 } |
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314 |
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315 // Method handle invokes and invokedynamic sites use both cp cache words. |
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316 // refs[f2], if not null, contains a value passed as a trailing argument to the adapter. |
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317 // In the general case, this could be the call site's MethodType, |
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318 // for use with java.lang.Invokers.checkExactType, or else a CallSite object. |
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319 // f1 contains the adapter method which manages the actual call. |
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320 // In the general case, this is a compiled LambdaForm. |
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321 // (The Java code is free to optimize these calls by binding other |
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322 // sorts of methods and appendices to call sites.) |
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323 // JVM-level linking is via f1, as if for invokespecial, and signatures are erased. |
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324 // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits. |
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325 // Even with the appendix, the method will never take more than 255 parameter slots. |
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326 // |
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327 // This means that given a call site like (List)mh.invoke("foo"), |
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328 // the f1 method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;', |
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329 // not '(Ljava/lang/String;)Ljava/util/List;'. |
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330 // The fact that String and List are involved is encoded in the MethodType in refs[f2]. |
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331 // This allows us to create fewer method oops, while keeping type safety. |
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332 // |
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333 |
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334 objArrayHandle resolved_references = cpool->resolved_references(); |
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335 // Store appendix, if any. |
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336 if (has_appendix) { |
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337 const int appendix_index = f2_as_index() + _indy_resolved_references_appendix_offset; |
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338 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob"); |
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339 assert(resolved_references->obj_at(appendix_index) == NULL, "init just once"); |
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340 resolved_references->obj_at_put(appendix_index, appendix()); |
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341 } |
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342 |
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343 // Store MethodType, if any. |
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344 if (has_method_type) { |
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345 const int method_type_index = f2_as_index() + _indy_resolved_references_method_type_offset; |
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346 assert(method_type_index >= 0 && method_type_index < resolved_references->length(), "oob"); |
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347 assert(resolved_references->obj_at(method_type_index) == NULL, "init just once"); |
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348 resolved_references->obj_at_put(method_type_index, method_type()); |
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349 } |
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350 |
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351 release_set_f1(adapter()); // This must be the last one to set (see NOTE above)! |
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352 |
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353 // The interpreter assembly code does not check byte_2, |
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354 // but it is used by is_resolved, method_if_resolved, etc. |
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355 set_bytecode_1(invoke_code); |
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356 NOT_PRODUCT(verify(tty)); |
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357 if (TraceInvokeDynamic) { |
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358 this->print(tty, 0); |
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359 } |
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360 } |
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361 |
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362 Method* ConstantPoolCacheEntry::method_if_resolved(constantPoolHandle cpool) { |
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363 // Decode the action of set_method and set_interface_call |
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364 Bytecodes::Code invoke_code = bytecode_1(); |
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365 if (invoke_code != (Bytecodes::Code)0) { |
14909 | 366 Metadata* f1 = (Metadata*)_f1; |
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367 if (f1 != NULL) { |
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368 switch (invoke_code) { |
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369 case Bytecodes::_invokeinterface: |
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370 assert(f1->is_klass(), ""); |
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371 return klassItable::method_for_itable_index((Klass*)f1, f2_as_index()); |
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372 case Bytecodes::_invokestatic: |
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373 case Bytecodes::_invokespecial: |
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374 assert(!has_appendix(), ""); |
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375 case Bytecodes::_invokehandle: |
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376 case Bytecodes::_invokedynamic: |
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377 assert(f1->is_method(), ""); |
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378 return (Method*)f1; |
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379 } |
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380 } |
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381 } |
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382 invoke_code = bytecode_2(); |
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383 if (invoke_code != (Bytecodes::Code)0) { |
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384 switch (invoke_code) { |
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385 case Bytecodes::_invokevirtual: |
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386 if (is_vfinal()) { |
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387 // invokevirtual |
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388 Method* m = f2_as_vfinal_method(); |
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389 assert(m->is_method(), ""); |
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390 return m; |
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391 } else { |
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392 int holder_index = cpool->uncached_klass_ref_index_at(constant_pool_index()); |
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393 if (cpool->tag_at(holder_index).is_klass()) { |
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394 Klass* klass = cpool->resolved_klass_at(holder_index); |
6983 | 395 if (!klass->oop_is_instance()) |
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396 klass = SystemDictionary::Object_klass(); |
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397 return InstanceKlass::cast(klass)->method_at_vtable(f2_as_index()); |
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398 } |
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399 } |
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400 break; |
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401 } |
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402 } |
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403 return NULL; |
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404 } |
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405 |
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406 |
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407 oop ConstantPoolCacheEntry::appendix_if_resolved(constantPoolHandle cpool) { |
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408 if (is_f1_null() || !has_appendix()) |
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409 return NULL; |
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410 const int ref_index = f2_as_index() + _indy_resolved_references_appendix_offset; |
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411 objArrayOop resolved_references = cpool->resolved_references(); |
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412 return resolved_references->obj_at(ref_index); |
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413 } |
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414 |
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415 |
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416 oop ConstantPoolCacheEntry::method_type_if_resolved(constantPoolHandle cpool) { |
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417 if (is_f1_null() || !has_method_type()) |
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418 return NULL; |
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419 const int ref_index = f2_as_index() + _indy_resolved_references_method_type_offset; |
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420 objArrayOop resolved_references = cpool->resolved_references(); |
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421 return resolved_references->obj_at(ref_index); |
0 | 422 } |
423 | |
424 | |
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425 #if INCLUDE_JVMTI |
0 | 426 // RedefineClasses() API support: |
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427 // If this ConstantPoolCacheEntry refers to old_method then update it |
0 | 428 // to refer to new_method. |
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429 bool ConstantPoolCacheEntry::adjust_method_entry(Method* old_method, |
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430 Method* new_method, bool * trace_name_printed) { |
0 | 431 |
432 if (is_vfinal()) { | |
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433 // virtual and final so _f2 contains method ptr instead of vtable index |
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434 if (f2_as_vfinal_method() == old_method) { |
0 | 435 // match old_method so need an update |
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436 // NOTE: can't use set_f2_as_vfinal_method as it asserts on different values |
0 | 437 _f2 = (intptr_t)new_method; |
438 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
439 if (!(*trace_name_printed)) { | |
440 // RC_TRACE_MESG macro has an embedded ResourceMark | |
441 RC_TRACE_MESG(("adjust: name=%s", | |
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442 old_method->method_holder()->external_name())); |
0 | 443 *trace_name_printed = true; |
444 } | |
445 // RC_TRACE macro has an embedded ResourceMark | |
446 RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)", | |
447 new_method->name()->as_C_string(), | |
448 new_method->signature()->as_C_string())); | |
449 } | |
450 | |
451 return true; | |
452 } | |
453 | |
454 // f1() is not used with virtual entries so bail out | |
455 return false; | |
456 } | |
457 | |
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458 if (_f1 == NULL) { |
0 | 459 // NULL f1() means this is a virtual entry so bail out |
460 // We are assuming that the vtable index does not need change. | |
461 return false; | |
462 } | |
463 | |
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464 if (_f1 == old_method) { |
0 | 465 _f1 = new_method; |
466 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
467 if (!(*trace_name_printed)) { | |
468 // RC_TRACE_MESG macro has an embedded ResourceMark | |
469 RC_TRACE_MESG(("adjust: name=%s", | |
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470 old_method->method_holder()->external_name())); |
0 | 471 *trace_name_printed = true; |
472 } | |
473 // RC_TRACE macro has an embedded ResourceMark | |
474 RC_TRACE(0x00400000, ("cpc entry update: %s(%s)", | |
475 new_method->name()->as_C_string(), | |
476 new_method->signature()->as_C_string())); | |
477 } | |
478 | |
479 return true; | |
480 } | |
481 | |
482 return false; | |
483 } | |
484 | |
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485 // a constant pool cache entry should never contain old or obsolete methods |
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486 bool ConstantPoolCacheEntry::check_no_old_or_obsolete_entries() { |
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487 if (is_vfinal()) { |
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488 // virtual and final so _f2 contains method ptr instead of vtable index |
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489 Metadata* f2 = (Metadata*)_f2; |
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490 // Return false if _f2 refers to an old or an obsolete method. |
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491 // _f2 == NULL || !_f2->is_method() are just as unexpected here. |
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492 return (f2 != NULL NOT_PRODUCT(&& f2->is_valid()) && f2->is_method() && |
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493 !((Method*)f2)->is_old() && !((Method*)f2)->is_obsolete()); |
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494 } else if (_f1 == NULL || |
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495 (NOT_PRODUCT(_f1->is_valid() &&) !_f1->is_method())) { |
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496 // _f1 == NULL || !_f1->is_method() are OK here |
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497 return true; |
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498 } |
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499 // return false if _f1 refers to an old or an obsolete method |
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500 return (NOT_PRODUCT(_f1->is_valid() &&) _f1->is_method() && |
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501 !((Method*)_f1)->is_old() && !((Method*)_f1)->is_obsolete()); |
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502 } |
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503 |
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504 bool ConstantPoolCacheEntry::is_interesting_method_entry(Klass* k) { |
0 | 505 if (!is_method_entry()) { |
506 // not a method entry so not interesting by default | |
507 return false; | |
508 } | |
509 | |
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510 Method* m = NULL; |
0 | 511 if (is_vfinal()) { |
512 // virtual and final so _f2 contains method ptr instead of vtable index | |
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513 m = f2_as_vfinal_method(); |
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514 } else if (is_f1_null()) { |
0 | 515 // NULL _f1 means this is a virtual entry so also not interesting |
516 return false; | |
517 } else { | |
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518 if (!(_f1->is_method())) { |
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519 // _f1 can also contain a Klass* for an interface |
0 | 520 return false; |
521 } | |
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522 m = f1_as_method(); |
0 | 523 } |
524 | |
525 assert(m != NULL && m->is_method(), "sanity check"); | |
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526 if (m == NULL || !m->is_method() || (k != NULL && m->method_holder() != k)) { |
0 | 527 // robustness for above sanity checks or method is not in |
528 // the interesting class | |
529 return false; | |
530 } | |
531 | |
532 // the method is in the interesting class so the entry is interesting | |
533 return true; | |
534 } | |
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535 #endif // INCLUDE_JVMTI |
0 | 536 |
537 void ConstantPoolCacheEntry::print(outputStream* st, int index) const { | |
538 // print separator | |
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539 if (index == 0) st->print_cr(" -------------"); |
0 | 540 // print entry |
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541 st->print("%3d ("PTR_FORMAT") ", index, (intptr_t)this); |
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542 st->print_cr("[%02x|%02x|%5d]", bytecode_2(), bytecode_1(), |
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543 constant_pool_index()); |
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544 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f1); |
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545 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f2); |
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546 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_flags); |
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547 st->print_cr(" -------------"); |
0 | 548 } |
549 | |
550 void ConstantPoolCacheEntry::verify(outputStream* st) const { | |
551 // not implemented yet | |
552 } | |
553 | |
554 // Implementation of ConstantPoolCache | |
555 | |
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556 ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data, |
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557 const intStack& index_map, |
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558 const intStack& invokedynamic_index_map, |
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559 const intStack& invokedynamic_map, TRAPS) { |
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560 |
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561 const int length = index_map.length() + invokedynamic_index_map.length(); |
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562 int size = ConstantPoolCache::size(length); |
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563 |
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564 return new (loader_data, size, false, MetaspaceObj::ConstantPoolCacheType, THREAD) |
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565 ConstantPoolCache(length, index_map, invokedynamic_index_map, invokedynamic_map); |
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566 } |
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567 |
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568 void ConstantPoolCache::initialize(const intArray& inverse_index_map, |
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569 const intArray& invokedynamic_inverse_index_map, |
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570 const intArray& invokedynamic_references_map) { |
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571 for (int i = 0; i < inverse_index_map.length(); i++) { |
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572 ConstantPoolCacheEntry* e = entry_at(i); |
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573 int original_index = inverse_index_map[i]; |
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574 e->initialize_entry(original_index); |
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575 assert(entry_at(i) == e, "sanity"); |
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576 } |
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577 |
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578 // Append invokedynamic entries at the end |
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579 int invokedynamic_offset = inverse_index_map.length(); |
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580 for (int i = 0; i < invokedynamic_inverse_index_map.length(); i++) { |
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581 int offset = i + invokedynamic_offset; |
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582 ConstantPoolCacheEntry* e = entry_at(offset); |
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583 int original_index = invokedynamic_inverse_index_map[i]; |
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584 e->initialize_entry(original_index); |
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585 assert(entry_at(offset) == e, "sanity"); |
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586 } |
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587 |
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588 for (int ref = 0; ref < invokedynamic_references_map.length(); ref++) { |
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589 const int cpci = invokedynamic_references_map[ref]; |
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590 if (cpci >= 0) { |
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591 #ifdef ASSERT |
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592 // invokedynamic and invokehandle have more entries; check if they |
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593 // all point to the same constant pool cache entry. |
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594 for (int entry = 1; entry < ConstantPoolCacheEntry::_indy_resolved_references_entries; entry++) { |
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595 const int cpci_next = invokedynamic_references_map[ref + entry]; |
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596 assert(cpci == cpci_next, err_msg_res("%d == %d", cpci, cpci_next)); |
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597 } |
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598 #endif |
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599 entry_at(cpci)->initialize_resolved_reference_index(ref); |
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600 ref += ConstantPoolCacheEntry::_indy_resolved_references_entries - 1; // skip extra entries |
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601 } |
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602 } |
0 | 603 } |
604 | |
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605 #if INCLUDE_JVMTI |
0 | 606 // RedefineClasses() API support: |
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607 // If any entry of this ConstantPoolCache points to any of |
0 | 608 // old_methods, replace it with the corresponding new_method. |
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609 void ConstantPoolCache::adjust_method_entries(Method** old_methods, Method** new_methods, |
0 | 610 int methods_length, bool * trace_name_printed) { |
611 | |
612 if (methods_length == 0) { | |
613 // nothing to do if there are no methods | |
614 return; | |
615 } | |
616 | |
617 // get shorthand for the interesting class | |
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618 Klass* old_holder = old_methods[0]->method_holder(); |
0 | 619 |
620 for (int i = 0; i < length(); i++) { | |
621 if (!entry_at(i)->is_interesting_method_entry(old_holder)) { | |
622 // skip uninteresting methods | |
623 continue; | |
624 } | |
625 | |
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626 // The ConstantPoolCache contains entries for several different |
0 | 627 // things, but we only care about methods. In fact, we only care |
628 // about methods in the same class as the one that contains the | |
629 // old_methods. At this point, we have an interesting entry. | |
630 | |
631 for (int j = 0; j < methods_length; j++) { | |
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632 Method* old_method = old_methods[j]; |
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633 Method* new_method = new_methods[j]; |
0 | 634 |
635 if (entry_at(i)->adjust_method_entry(old_method, new_method, | |
636 trace_name_printed)) { | |
637 // current old_method matched this entry and we updated it so | |
638 // break out and get to the next interesting entry if there one | |
639 break; | |
640 } | |
641 } | |
642 } | |
643 } | |
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644 |
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645 // the constant pool cache should never contain old or obsolete methods |
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646 bool ConstantPoolCache::check_no_old_or_obsolete_entries() { |
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647 for (int i = 1; i < length(); i++) { |
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648 if (entry_at(i)->is_interesting_method_entry(NULL) && |
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649 !entry_at(i)->check_no_old_or_obsolete_entries()) { |
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650 return false; |
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651 } |
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652 } |
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653 return true; |
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654 } |
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655 |
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656 void ConstantPoolCache::dump_cache() { |
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657 for (int i = 1; i < length(); i++) { |
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658 if (entry_at(i)->is_interesting_method_entry(NULL)) { |
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659 entry_at(i)->print(tty, i); |
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660 } |
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661 } |
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662 } |
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663 #endif // INCLUDE_JVMTI |
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664 |
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665 |
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666 // Printing |
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667 |
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668 void ConstantPoolCache::print_on(outputStream* st) const { |
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669 assert(is_constantPoolCache(), "obj must be constant pool cache"); |
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670 st->print_cr(internal_name()); |
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671 // print constant pool cache entries |
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672 for (int i = 0; i < length(); i++) entry_at(i)->print(st, i); |
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673 } |
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674 |
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675 void ConstantPoolCache::print_value_on(outputStream* st) const { |
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676 assert(is_constantPoolCache(), "obj must be constant pool cache"); |
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677 st->print("cache [%d]", length()); |
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678 print_address_on(st); |
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679 st->print(" for "); |
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680 constant_pool()->print_value_on(st); |
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681 } |
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682 |
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683 |
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684 // Verification |
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685 |
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686 void ConstantPoolCache::verify_on(outputStream* st) { |
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687 guarantee(is_constantPoolCache(), "obj must be constant pool cache"); |
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688 // print constant pool cache entries |
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689 for (int i = 0; i < length(); i++) entry_at(i)->verify(st); |
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690 } |