Mercurial > hg > truffle
annotate src/share/vm/oops/cpCacheOop.cpp @ 6521:2a0c9f20baa1
consolidated framework for runtime and stub calls and moved declaration of descriptors for such calls to the source file in which they are used
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 05 Oct 2012 17:55:12 +0200 |
parents | 1d7922586cf6 |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/shared/markSweep.inline.hpp" | |
27 #include "interpreter/interpreter.hpp" | |
28 #include "interpreter/rewriter.hpp" | |
29 #include "memory/universe.inline.hpp" | |
30 #include "oops/cpCacheOop.hpp" | |
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" |
0 | 36 |
37 | |
38 // Implememtation of ConstantPoolCacheEntry | |
39 | |
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40 void ConstantPoolCacheEntry::initialize_entry(int index) { |
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41 assert(0 < index && index < 0x10000, "sanity check"); |
0 | 42 _indices = index; |
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43 assert(constant_pool_index() == index, ""); |
0 | 44 } |
45 | |
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46 void ConstantPoolCacheEntry::initialize_secondary_entry(int main_index) { |
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47 assert(0 <= main_index && main_index < 0x10000, "sanity check"); |
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48 _indices = (main_index << main_cp_index_bits); |
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49 assert(main_entry_index() == main_index, ""); |
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50 } |
0 | 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) { | |
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68 assert(!is_secondary_entry(), "must not overwrite main_entry_index"); |
0 | 69 #ifdef ASSERT |
70 // Read once. | |
71 volatile Bytecodes::Code c = bytecode_1(); | |
72 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
73 #endif | |
74 // Need to flush pending stores here before bytecode is written. | |
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75 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_1_shift)); |
0 | 76 } |
77 | |
78 void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) { | |
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79 assert(!is_secondary_entry(), "must not overwrite main_entry_index"); |
0 | 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(oop f1) { |
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91 // Use barriers as in oop_store |
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92 assert(f1 != NULL, ""); |
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93 oop* f1_addr = (oop*) &_f1; |
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94 update_barrier_set_pre(f1_addr, f1); |
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95 OrderAccess::release_store_ptr((intptr_t*)f1_addr, f1); |
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96 update_barrier_set((void*) f1_addr, f1); |
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97 } |
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98 |
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99 // Sets flags, but only if the value was previously zero. |
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100 bool ConstantPoolCacheEntry::init_flags_atomic(intptr_t flags) { |
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101 intptr_t result = Atomic::cmpxchg_ptr(flags, &_flags, 0); |
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102 return (result == 0); |
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103 } |
1903 | 104 |
0 | 105 #ifdef ASSERT |
106 // It is possible to have two different dummy methodOops created | |
107 // when the resolve code for invoke interface executes concurrently | |
108 // Hence the assertion below is weakened a bit for the invokeinterface | |
109 // case. | |
110 bool ConstantPoolCacheEntry::same_methodOop(oop cur_f1, oop f1) { | |
111 return (cur_f1 == f1 || ((methodOop)cur_f1)->name() == | |
112 ((methodOop)f1)->name() || ((methodOop)cur_f1)->signature() == | |
113 ((methodOop)f1)->signature()); | |
114 } | |
115 #endif | |
116 | |
117 // Note that concurrent update of both bytecodes can leave one of them | |
118 // reset to zero. This is harmless; the interpreter will simply re-resolve | |
119 // the damaged entry. More seriously, the memory synchronization is needed | |
120 // to flush other fields (f1, f2) completely to memory before the bytecodes | |
121 // are updated, lest other processors see a non-zero bytecode but zero f1/f2. | |
122 void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code, | |
123 Bytecodes::Code put_code, | |
124 KlassHandle field_holder, | |
3938 | 125 int field_index, |
0 | 126 int field_offset, |
127 TosState field_type, | |
128 bool is_final, | |
129 bool is_volatile) { | |
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130 set_f1(field_holder()->java_mirror()); |
0 | 131 set_f2(field_offset); |
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132 assert((field_index & field_index_mask) == field_index, |
0 | 133 "field index does not fit in low flag bits"); |
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134 set_field_flags(field_type, |
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135 ((is_volatile ? 1 : 0) << is_volatile_shift) | |
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136 ((is_final ? 1 : 0) << is_final_shift), |
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137 field_index); |
0 | 138 set_bytecode_1(get_code); |
139 set_bytecode_2(put_code); | |
140 NOT_PRODUCT(verify(tty)); | |
141 } | |
142 | |
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143 void ConstantPoolCacheEntry::set_parameter_size(int value) { |
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144 // This routine is called only in corner cases where the CPCE is not yet initialized. |
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145 // See AbstractInterpreter::deopt_continue_after_entry. |
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146 assert(_flags == 0 || parameter_size() == 0 || parameter_size() == value, |
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147 err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value)); |
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148 // Setting the parameter size by itself is only safe if the |
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149 // current value of _flags is 0, otherwise another thread may have |
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150 // updated it and we don't want to overwrite that value. Don't |
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151 // bother trying to update it once it's nonzero but always make |
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152 // sure that the final parameter size agrees with what was passed. |
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153 if (_flags == 0) { |
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154 Atomic::cmpxchg_ptr((value & parameter_size_mask), &_flags, 0); |
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155 } |
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156 guarantee(parameter_size() == value, |
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157 err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value)); |
0 | 158 } |
159 | |
160 void ConstantPoolCacheEntry::set_method(Bytecodes::Code invoke_code, | |
161 methodHandle method, | |
162 int vtable_index) { | |
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163 assert(!is_secondary_entry(), ""); |
0 | 164 assert(method->interpreter_entry() != NULL, "should have been set at this point"); |
165 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache"); | |
166 | |
167 int byte_no = -1; | |
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168 bool change_to_virtual = false; |
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169 |
0 | 170 switch (invoke_code) { |
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171 case Bytecodes::_invokeinterface: |
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172 // We get here from InterpreterRuntime::resolve_invoke when an invokeinterface |
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173 // instruction somehow links to a non-interface method (in Object). |
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174 // In that case, the method has no itable index and must be invoked as a virtual. |
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175 // Set a flag to keep track of this corner case. |
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176 change_to_virtual = true; |
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177 |
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178 // ...and fall through as if we were handling invokevirtual: |
0 | 179 case Bytecodes::_invokevirtual: |
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180 { |
0 | 181 if (method->can_be_statically_bound()) { |
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182 // set_f2_as_vfinal_method checks if is_vfinal flag is true. |
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183 set_method_flags(as_TosState(method->result_type()), |
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184 ( 1 << is_vfinal_shift) | |
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185 ((method->is_final_method() ? 1 : 0) << is_final_shift) | |
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186 ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift), |
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187 method()->size_of_parameters()); |
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188 set_f2_as_vfinal_method(method()); |
0 | 189 } else { |
190 assert(vtable_index >= 0, "valid index"); | |
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191 assert(!method->is_final_method(), "sanity"); |
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192 set_method_flags(as_TosState(method->result_type()), |
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193 ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift), |
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194 method()->size_of_parameters()); |
0 | 195 set_f2(vtable_index); |
196 } | |
197 byte_no = 2; | |
198 break; | |
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199 } |
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200 |
0 | 201 case Bytecodes::_invokespecial: |
202 case Bytecodes::_invokestatic: | |
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203 // Note: Read and preserve the value of the is_vfinal flag on any |
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204 // invokevirtual bytecode shared with this constant pool cache entry. |
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205 // It is cheap and safe to consult is_vfinal() at all times. |
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206 // Once is_vfinal is set, it must stay that way, lest we get a dangling oop. |
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207 set_method_flags(as_TosState(method->result_type()), |
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208 ((is_vfinal() ? 1 : 0) << is_vfinal_shift) | |
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209 ((method->is_final_method() ? 1 : 0) << is_final_shift), |
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210 method()->size_of_parameters()); |
0 | 211 set_f1(method()); |
212 byte_no = 1; | |
213 break; | |
214 default: | |
215 ShouldNotReachHere(); | |
216 break; | |
217 } | |
218 | |
219 // Note: byte_no also appears in TemplateTable::resolve. | |
220 if (byte_no == 1) { | |
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221 assert(invoke_code != Bytecodes::_invokevirtual && |
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222 invoke_code != Bytecodes::_invokeinterface, ""); |
0 | 223 set_bytecode_1(invoke_code); |
224 } else if (byte_no == 2) { | |
225 if (change_to_virtual) { | |
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226 assert(invoke_code == Bytecodes::_invokeinterface, ""); |
0 | 227 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!! |
228 // | |
229 // Workaround for the case where we encounter an invokeinterface, but we | |
230 // should really have an _invokevirtual since the resolved method is a | |
231 // virtual method in java.lang.Object. This is a corner case in the spec | |
232 // but is presumably legal. javac does not generate this code. | |
233 // | |
234 // We set bytecode_1() to _invokeinterface, because that is the | |
235 // bytecode # used by the interpreter to see if it is resolved. | |
236 // We set bytecode_2() to _invokevirtual. | |
237 // See also interpreterRuntime.cpp. (8/25/2000) | |
238 // Only set resolved for the invokeinterface case if method is public. | |
239 // Otherwise, the method needs to be reresolved with caller for each | |
240 // interface call. | |
241 if (method->is_public()) set_bytecode_1(invoke_code); | |
242 } else { | |
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243 assert(invoke_code == Bytecodes::_invokevirtual, ""); |
0 | 244 } |
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245 // set up for invokevirtual, even if linking for invokeinterface also: |
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246 set_bytecode_2(Bytecodes::_invokevirtual); |
0 | 247 } else { |
248 ShouldNotReachHere(); | |
249 } | |
250 NOT_PRODUCT(verify(tty)); | |
251 } | |
252 | |
253 | |
254 void ConstantPoolCacheEntry::set_interface_call(methodHandle method, int index) { | |
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255 assert(!is_secondary_entry(), ""); |
0 | 256 klassOop interf = method->method_holder(); |
257 assert(instanceKlass::cast(interf)->is_interface(), "must be an interface"); | |
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258 assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here"); |
0 | 259 set_f1(interf); |
260 set_f2(index); | |
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261 set_method_flags(as_TosState(method->result_type()), |
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262 0, // no option bits |
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263 method()->size_of_parameters()); |
0 | 264 set_bytecode_1(Bytecodes::_invokeinterface); |
265 } | |
266 | |
267 | |
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268 void ConstantPoolCacheEntry::set_method_handle(methodHandle adapter, Handle appendix) { |
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269 assert(!is_secondary_entry(), ""); |
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270 set_method_handle_common(Bytecodes::_invokehandle, adapter, appendix); |
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271 } |
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272 |
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273 void ConstantPoolCacheEntry::set_dynamic_call(methodHandle adapter, Handle appendix) { |
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274 assert(is_secondary_entry(), ""); |
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275 set_method_handle_common(Bytecodes::_invokedynamic, adapter, appendix); |
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276 } |
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277 |
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278 void ConstantPoolCacheEntry::set_method_handle_common(Bytecodes::Code invoke_code, methodHandle adapter, Handle appendix) { |
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279 // NOTE: This CPCE can be the subject of data races. |
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280 // There are three words to update: flags, f2, f1 (in that order). |
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281 // Writers must store all other values before f1. |
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282 // Readers must test f1 first for non-null before reading other fields. |
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283 // Competing writers must acquire exclusive access on the first |
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284 // write, to flags, using a compare/exchange. |
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285 // A losing writer must spin until the winner writes f1, |
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286 // so that when he returns, he can use the linked cache entry. |
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287 |
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288 bool has_appendix = appendix.not_null(); |
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289 if (!has_appendix) { |
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290 // The extra argument is not used, but we need a non-null value to signify linkage state. |
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291 // Set it to something benign that will never leak memory. |
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292 appendix = Universe::void_mirror(); |
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293 } |
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294 |
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295 bool owner = |
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296 init_method_flags_atomic(as_TosState(adapter->result_type()), |
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297 ((has_appendix ? 1 : 0) << has_appendix_shift) | |
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298 ( 1 << is_vfinal_shift) | |
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299 ( 1 << is_final_shift), |
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300 adapter->size_of_parameters()); |
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301 if (!owner) { |
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302 while (is_f1_null()) { |
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303 // Pause momentarily on a low-level lock, to allow racing thread to win. |
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304 MutexLockerEx mu(Patching_lock, Mutex::_no_safepoint_check_flag); |
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305 os::yield(); |
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306 } |
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307 return; |
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308 } |
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309 |
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310 if (TraceInvokeDynamic) { |
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311 tty->print_cr("set_method_handle bc=%d appendix="PTR_FORMAT"%s method="PTR_FORMAT" ", |
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312 invoke_code, |
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313 (intptr_t)appendix(), (has_appendix ? "" : " (unused)"), |
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314 (intptr_t)adapter()); |
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315 adapter->print(); |
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316 if (has_appendix) appendix()->print(); |
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317 } |
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318 |
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319 // Method handle invokes and invokedynamic sites use both cp cache words. |
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320 // f1, if not null, contains a value passed as a trailing argument to the adapter. |
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321 // In the general case, this could be the call site's MethodType, |
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322 // for use with java.lang.Invokers.checkExactType, or else a CallSite object. |
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323 // f2 contains the adapter method which manages the actual call. |
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324 // In the general case, this is a compiled LambdaForm. |
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325 // (The Java code is free to optimize these calls by binding other |
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326 // sorts of methods and appendices to call sites.) |
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327 // JVM-level linking is via f2, as if for invokevfinal, and signatures are erased. |
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328 // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits. |
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329 // In principle this means that the method (with appendix) could take up to 256 parameter slots. |
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330 // |
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331 // This means that given a call site like (List)mh.invoke("foo"), |
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332 // the f2 method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;', |
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333 // not '(Ljava/lang/String;)Ljava/util/List;'. |
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334 // The fact that String and List are involved is encoded in the MethodType in f1. |
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335 // This allows us to create fewer method oops, while keeping type safety. |
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336 // |
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337 set_f2_as_vfinal_method(adapter()); |
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338 assert(appendix.not_null(), "needed for linkage state"); |
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339 release_set_f1(appendix()); // This must be the last one to set (see NOTE above)! |
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340 if (!is_secondary_entry()) { |
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341 // The interpreter assembly code does not check byte_2, |
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342 // but it is used by is_resolved, method_if_resolved, etc. |
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343 set_bytecode_2(invoke_code); |
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344 } |
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345 NOT_PRODUCT(verify(tty)); |
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346 if (TraceInvokeDynamic) { |
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347 this->print(tty, 0); |
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348 } |
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349 } |
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350 |
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351 methodOop ConstantPoolCacheEntry::method_if_resolved(constantPoolHandle cpool) { |
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352 if (is_secondary_entry()) { |
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353 if (!is_f1_null()) |
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354 return f2_as_vfinal_method(); |
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355 return NULL; |
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356 } |
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357 // Decode the action of set_method and set_interface_call |
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358 Bytecodes::Code invoke_code = bytecode_1(); |
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359 if (invoke_code != (Bytecodes::Code)0) { |
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360 oop f1 = _f1; |
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361 if (f1 != NULL) { |
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362 switch (invoke_code) { |
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363 case Bytecodes::_invokeinterface: |
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364 assert(f1->is_klass(), ""); |
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365 return klassItable::method_for_itable_index(klassOop(f1), f2_as_index()); |
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366 case Bytecodes::_invokestatic: |
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367 case Bytecodes::_invokespecial: |
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368 assert(!has_appendix(), ""); |
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369 assert(f1->is_method(), ""); |
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370 return methodOop(f1); |
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371 } |
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372 } |
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373 } |
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374 invoke_code = bytecode_2(); |
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375 if (invoke_code != (Bytecodes::Code)0) { |
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376 switch (invoke_code) { |
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377 case Bytecodes::_invokevirtual: |
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378 if (is_vfinal()) { |
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379 // invokevirtual |
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380 methodOop m = f2_as_vfinal_method(); |
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381 assert(m->is_method(), ""); |
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382 return m; |
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383 } else { |
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384 int holder_index = cpool->uncached_klass_ref_index_at(constant_pool_index()); |
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385 if (cpool->tag_at(holder_index).is_klass()) { |
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386 klassOop klass = cpool->resolved_klass_at(holder_index); |
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387 if (!Klass::cast(klass)->oop_is_instance()) |
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388 klass = SystemDictionary::Object_klass(); |
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389 return instanceKlass::cast(klass)->method_at_vtable(f2_as_index()); |
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390 } |
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391 } |
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392 break; |
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393 case Bytecodes::_invokehandle: |
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394 case Bytecodes::_invokedynamic: |
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395 return f2_as_vfinal_method(); |
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396 } |
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397 } |
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398 return NULL; |
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399 } |
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400 |
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401 |
0 | 402 class LocalOopClosure: public OopClosure { |
403 private: | |
404 void (*_f)(oop*); | |
405 | |
406 public: | |
407 LocalOopClosure(void f(oop*)) { _f = f; } | |
408 virtual void do_oop(oop* o) { _f(o); } | |
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409 virtual void do_oop(narrowOop *o) { ShouldNotReachHere(); } |
0 | 410 }; |
411 | |
412 | |
413 void ConstantPoolCacheEntry::oops_do(void f(oop*)) { | |
414 LocalOopClosure blk(f); | |
415 oop_iterate(&blk); | |
416 } | |
417 | |
418 | |
419 void ConstantPoolCacheEntry::oop_iterate(OopClosure* blk) { | |
420 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
421 // field[1] is always oop or NULL | |
422 blk->do_oop((oop*)&_f1); | |
423 if (is_vfinal()) { | |
424 blk->do_oop((oop*)&_f2); | |
425 } | |
426 } | |
427 | |
428 | |
429 void ConstantPoolCacheEntry::oop_iterate_m(OopClosure* blk, MemRegion mr) { | |
430 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
431 // field[1] is always oop or NULL | |
432 if (mr.contains((oop *)&_f1)) blk->do_oop((oop*)&_f1); | |
433 if (is_vfinal()) { | |
434 if (mr.contains((oop *)&_f2)) blk->do_oop((oop*)&_f2); | |
435 } | |
436 } | |
437 | |
438 | |
439 void ConstantPoolCacheEntry::follow_contents() { | |
440 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
441 // field[1] is always oop or NULL | |
442 MarkSweep::mark_and_push((oop*)&_f1); | |
443 if (is_vfinal()) { | |
444 MarkSweep::mark_and_push((oop*)&_f2); | |
445 } | |
446 } | |
447 | |
448 #ifndef SERIALGC | |
449 void ConstantPoolCacheEntry::follow_contents(ParCompactionManager* cm) { | |
450 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
451 // field[1] is always oop or NULL | |
452 PSParallelCompact::mark_and_push(cm, (oop*)&_f1); | |
453 if (is_vfinal()) { | |
454 PSParallelCompact::mark_and_push(cm, (oop*)&_f2); | |
455 } | |
456 } | |
457 #endif // SERIALGC | |
458 | |
459 void ConstantPoolCacheEntry::adjust_pointers() { | |
460 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
461 // field[1] is always oop or NULL | |
462 MarkSweep::adjust_pointer((oop*)&_f1); | |
463 if (is_vfinal()) { | |
464 MarkSweep::adjust_pointer((oop*)&_f2); | |
465 } | |
466 } | |
467 | |
468 #ifndef SERIALGC | |
469 void ConstantPoolCacheEntry::update_pointers() { | |
470 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
471 // field[1] is always oop or NULL | |
472 PSParallelCompact::adjust_pointer((oop*)&_f1); | |
473 if (is_vfinal()) { | |
474 PSParallelCompact::adjust_pointer((oop*)&_f2); | |
475 } | |
476 } | |
477 #endif // SERIALGC | |
478 | |
479 // RedefineClasses() API support: | |
480 // If this constantPoolCacheEntry refers to old_method then update it | |
481 // to refer to new_method. | |
482 bool ConstantPoolCacheEntry::adjust_method_entry(methodOop old_method, | |
483 methodOop new_method, bool * trace_name_printed) { | |
484 | |
485 if (is_vfinal()) { | |
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486 // virtual and final so _f2 contains method ptr instead of vtable index |
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487 if (f2_as_vfinal_method() == old_method) { |
0 | 488 // match old_method so need an update |
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489 // NOTE: can't use set_f2_as_vfinal_method as it asserts on different values |
0 | 490 _f2 = (intptr_t)new_method; |
491 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
492 if (!(*trace_name_printed)) { | |
493 // RC_TRACE_MESG macro has an embedded ResourceMark | |
494 RC_TRACE_MESG(("adjust: name=%s", | |
495 Klass::cast(old_method->method_holder())->external_name())); | |
496 *trace_name_printed = true; | |
497 } | |
498 // RC_TRACE macro has an embedded ResourceMark | |
499 RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)", | |
500 new_method->name()->as_C_string(), | |
501 new_method->signature()->as_C_string())); | |
502 } | |
503 | |
504 return true; | |
505 } | |
506 | |
507 // f1() is not used with virtual entries so bail out | |
508 return false; | |
509 } | |
510 | |
511 if ((oop)_f1 == NULL) { | |
512 // NULL f1() means this is a virtual entry so bail out | |
513 // We are assuming that the vtable index does not need change. | |
514 return false; | |
515 } | |
516 | |
517 if ((oop)_f1 == old_method) { | |
518 _f1 = new_method; | |
519 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
520 if (!(*trace_name_printed)) { | |
521 // RC_TRACE_MESG macro has an embedded ResourceMark | |
522 RC_TRACE_MESG(("adjust: name=%s", | |
523 Klass::cast(old_method->method_holder())->external_name())); | |
524 *trace_name_printed = true; | |
525 } | |
526 // RC_TRACE macro has an embedded ResourceMark | |
527 RC_TRACE(0x00400000, ("cpc entry update: %s(%s)", | |
528 new_method->name()->as_C_string(), | |
529 new_method->signature()->as_C_string())); | |
530 } | |
531 | |
532 return true; | |
533 } | |
534 | |
535 return false; | |
536 } | |
537 | |
538 bool ConstantPoolCacheEntry::is_interesting_method_entry(klassOop k) { | |
539 if (!is_method_entry()) { | |
540 // not a method entry so not interesting by default | |
541 return false; | |
542 } | |
543 | |
544 methodOop m = NULL; | |
545 if (is_vfinal()) { | |
546 // virtual and final so _f2 contains method ptr instead of vtable index | |
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547 m = f2_as_vfinal_method(); |
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548 } else if (is_f1_null()) { |
0 | 549 // NULL _f1 means this is a virtual entry so also not interesting |
550 return false; | |
551 } else { | |
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552 oop f1 = _f1; // _f1 is volatile |
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553 if (!f1->is_method()) { |
0 | 554 // _f1 can also contain a klassOop for an interface |
555 return false; | |
556 } | |
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557 m = f1_as_method(); |
0 | 558 } |
559 | |
560 assert(m != NULL && m->is_method(), "sanity check"); | |
561 if (m == NULL || !m->is_method() || m->method_holder() != k) { | |
562 // robustness for above sanity checks or method is not in | |
563 // the interesting class | |
564 return false; | |
565 } | |
566 | |
567 // the method is in the interesting class so the entry is interesting | |
568 return true; | |
569 } | |
570 | |
571 void ConstantPoolCacheEntry::print(outputStream* st, int index) const { | |
572 // print separator | |
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573 if (index == 0) st->print_cr(" -------------"); |
0 | 574 // print entry |
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575 st->print("%3d ("PTR_FORMAT") ", index, (intptr_t)this); |
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576 if (is_secondary_entry()) |
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577 st->print_cr("[%5d|secondary]", main_entry_index()); |
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578 else |
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579 st->print_cr("[%02x|%02x|%5d]", bytecode_2(), bytecode_1(), constant_pool_index()); |
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580 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)(oop)_f1); |
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581 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f2); |
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582 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_flags); |
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583 st->print_cr(" -------------"); |
0 | 584 } |
585 | |
586 void ConstantPoolCacheEntry::verify(outputStream* st) const { | |
587 // not implemented yet | |
588 } | |
589 | |
590 // Implementation of ConstantPoolCache | |
591 | |
592 void constantPoolCacheOopDesc::initialize(intArray& inverse_index_map) { | |
593 assert(inverse_index_map.length() == length(), "inverse index map must have same length as cache"); | |
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594 for (int i = 0; i < length(); i++) { |
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595 ConstantPoolCacheEntry* e = entry_at(i); |
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596 int original_index = inverse_index_map[i]; |
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597 if ((original_index & Rewriter::_secondary_entry_tag) != 0) { |
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598 int main_index = (original_index - Rewriter::_secondary_entry_tag); |
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599 assert(!entry_at(main_index)->is_secondary_entry(), "valid main index"); |
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600 e->initialize_secondary_entry(main_index); |
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601 } else { |
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602 e->initialize_entry(original_index); |
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603 } |
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604 assert(entry_at(i) == e, "sanity"); |
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605 } |
0 | 606 } |
607 | |
608 // RedefineClasses() API support: | |
609 // If any entry of this constantPoolCache points to any of | |
610 // old_methods, replace it with the corresponding new_method. | |
611 void constantPoolCacheOopDesc::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
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 | |
620 klassOop old_holder = old_methods[0]->method_holder(); | |
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 | |
628 // The constantPoolCache contains entries for several different | |
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++) { | |
634 methodOop old_method = old_methods[j]; | |
635 methodOop new_method = new_methods[j]; | |
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 } |