Mercurial > hg > graal-compiler
annotate src/share/vm/oops/cpCacheOop.cpp @ 1711:a6bff45449bc
6973570: OrderAccess::storestore() scales poorly on multi-socket x64 and sparc: cache-line ping-ponging
Summary: volatile store to static variable removed in favour of a volatile store to stack to avoid excessive cache coherency traffic; verified that the volatile store is not elided by any of our current compilers.
Reviewed-by: dholmes, dice, jcoomes, kvn
author | ysr |
---|---|
date | Tue, 10 Aug 2010 14:53:35 -0700 |
parents | e0ba4e04c839 |
children | 87d6a4d1ecbc |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2009, 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 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_cpCacheOop.cpp.incl" | |
27 | |
28 | |
29 // Implememtation of ConstantPoolCacheEntry | |
30 | |
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31 void ConstantPoolCacheEntry::initialize_entry(int index) { |
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32 assert(0 < index && index < 0x10000, "sanity check"); |
0 | 33 _indices = index; |
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34 assert(constant_pool_index() == index, ""); |
0 | 35 } |
36 | |
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37 void ConstantPoolCacheEntry::initialize_secondary_entry(int main_index) { |
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38 assert(0 <= main_index && main_index < 0x10000, "sanity check"); |
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39 _indices = (main_index << 16); |
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40 assert(main_entry_index() == main_index, ""); |
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41 } |
0 | 42 |
43 int ConstantPoolCacheEntry::as_flags(TosState state, bool is_final, | |
44 bool is_vfinal, bool is_volatile, | |
45 bool is_method_interface, bool is_method) { | |
46 int f = state; | |
47 | |
48 assert( state < number_of_states, "Invalid state in as_flags"); | |
49 | |
50 f <<= 1; | |
51 if (is_final) f |= 1; | |
52 f <<= 1; | |
53 if (is_vfinal) f |= 1; | |
54 f <<= 1; | |
55 if (is_volatile) f |= 1; | |
56 f <<= 1; | |
57 if (is_method_interface) f |= 1; | |
58 f <<= 1; | |
59 if (is_method) f |= 1; | |
60 f <<= ConstantPoolCacheEntry::hotSwapBit; | |
61 // Preserve existing flag bit values | |
62 #ifdef ASSERT | |
63 int old_state = ((_flags >> tosBits) & 0x0F); | |
64 assert(old_state == 0 || old_state == state, | |
65 "inconsistent cpCache flags state"); | |
66 #endif | |
67 return (_flags | f) ; | |
68 } | |
69 | |
70 void ConstantPoolCacheEntry::set_bytecode_1(Bytecodes::Code code) { | |
71 #ifdef ASSERT | |
72 // Read once. | |
73 volatile Bytecodes::Code c = bytecode_1(); | |
74 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
75 #endif | |
76 // Need to flush pending stores here before bytecode is written. | |
77 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << 16)); | |
78 } | |
79 | |
80 void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) { | |
81 #ifdef ASSERT | |
82 // Read once. | |
83 volatile Bytecodes::Code c = bytecode_2(); | |
84 assert(c == 0 || c == code || code == 0, "update must be consistent"); | |
85 #endif | |
86 // Need to flush pending stores here before bytecode is written. | |
87 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << 24)); | |
88 } | |
89 | |
90 #ifdef ASSERT | |
91 // It is possible to have two different dummy methodOops created | |
92 // when the resolve code for invoke interface executes concurrently | |
93 // Hence the assertion below is weakened a bit for the invokeinterface | |
94 // case. | |
95 bool ConstantPoolCacheEntry::same_methodOop(oop cur_f1, oop f1) { | |
96 return (cur_f1 == f1 || ((methodOop)cur_f1)->name() == | |
97 ((methodOop)f1)->name() || ((methodOop)cur_f1)->signature() == | |
98 ((methodOop)f1)->signature()); | |
99 } | |
100 #endif | |
101 | |
102 // Note that concurrent update of both bytecodes can leave one of them | |
103 // reset to zero. This is harmless; the interpreter will simply re-resolve | |
104 // the damaged entry. More seriously, the memory synchronization is needed | |
105 // to flush other fields (f1, f2) completely to memory before the bytecodes | |
106 // are updated, lest other processors see a non-zero bytecode but zero f1/f2. | |
107 void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code, | |
108 Bytecodes::Code put_code, | |
109 KlassHandle field_holder, | |
110 int orig_field_index, | |
111 int field_offset, | |
112 TosState field_type, | |
113 bool is_final, | |
114 bool is_volatile) { | |
115 set_f1(field_holder()); | |
116 set_f2(field_offset); | |
117 // The field index is used by jvm/ti and is the index into fields() array | |
118 // in holder instanceKlass. This is scaled by instanceKlass::next_offset. | |
119 assert((orig_field_index % instanceKlass::next_offset) == 0, "wierd index"); | |
120 const int field_index = orig_field_index / instanceKlass::next_offset; | |
121 assert(field_index <= field_index_mask, | |
122 "field index does not fit in low flag bits"); | |
123 set_flags(as_flags(field_type, is_final, false, is_volatile, false, false) | | |
124 (field_index & field_index_mask)); | |
125 set_bytecode_1(get_code); | |
126 set_bytecode_2(put_code); | |
127 NOT_PRODUCT(verify(tty)); | |
128 } | |
129 | |
130 int ConstantPoolCacheEntry::field_index() const { | |
131 return (_flags & field_index_mask) * instanceKlass::next_offset; | |
132 } | |
133 | |
134 void ConstantPoolCacheEntry::set_method(Bytecodes::Code invoke_code, | |
135 methodHandle method, | |
136 int vtable_index) { | |
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137 assert(!is_secondary_entry(), ""); |
0 | 138 assert(method->interpreter_entry() != NULL, "should have been set at this point"); |
139 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache"); | |
140 bool change_to_virtual = (invoke_code == Bytecodes::_invokeinterface); | |
141 | |
142 int byte_no = -1; | |
143 bool needs_vfinal_flag = false; | |
144 switch (invoke_code) { | |
145 case Bytecodes::_invokevirtual: | |
146 case Bytecodes::_invokeinterface: { | |
147 if (method->can_be_statically_bound()) { | |
148 set_f2((intptr_t)method()); | |
149 needs_vfinal_flag = true; | |
150 } else { | |
151 assert(vtable_index >= 0, "valid index"); | |
152 set_f2(vtable_index); | |
153 } | |
154 byte_no = 2; | |
155 break; | |
156 } | |
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157 |
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158 case Bytecodes::_invokedynamic: // similar to _invokevirtual |
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159 if (TraceInvokeDynamic) { |
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160 tty->print_cr("InvokeDynamic set_method%s method="PTR_FORMAT" index=%d", |
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161 (is_secondary_entry() ? " secondary" : ""), |
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162 (intptr_t)method(), vtable_index); |
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163 method->print(); |
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164 this->print(tty, 0); |
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165 } |
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166 assert(method->can_be_statically_bound(), "must be a MH invoker method"); |
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167 assert(AllowTransitionalJSR292 || _f2 >= constantPoolOopDesc::CPCACHE_INDEX_TAG, "BSM index initialized"); |
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168 set_f1(method()); |
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169 needs_vfinal_flag = false; // _f2 is not an oop |
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170 assert(!is_vfinal(), "f2 not an oop"); |
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171 byte_no = 1; // coordinate this with bytecode_number & is_resolved |
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172 break; |
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173 |
0 | 174 case Bytecodes::_invokespecial: |
175 // Preserve the value of the vfinal flag on invokevirtual bytecode | |
176 // which may be shared with this constant pool cache entry. | |
177 needs_vfinal_flag = is_resolved(Bytecodes::_invokevirtual) && is_vfinal(); | |
178 // fall through | |
179 case Bytecodes::_invokestatic: | |
180 set_f1(method()); | |
181 byte_no = 1; | |
182 break; | |
183 default: | |
184 ShouldNotReachHere(); | |
185 break; | |
186 } | |
187 | |
188 set_flags(as_flags(as_TosState(method->result_type()), | |
189 method->is_final_method(), | |
190 needs_vfinal_flag, | |
191 false, | |
192 change_to_virtual, | |
193 true)| | |
194 method()->size_of_parameters()); | |
195 | |
196 // Note: byte_no also appears in TemplateTable::resolve. | |
197 if (byte_no == 1) { | |
198 set_bytecode_1(invoke_code); | |
199 } else if (byte_no == 2) { | |
200 if (change_to_virtual) { | |
201 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!! | |
202 // | |
203 // Workaround for the case where we encounter an invokeinterface, but we | |
204 // should really have an _invokevirtual since the resolved method is a | |
205 // virtual method in java.lang.Object. This is a corner case in the spec | |
206 // but is presumably legal. javac does not generate this code. | |
207 // | |
208 // We set bytecode_1() to _invokeinterface, because that is the | |
209 // bytecode # used by the interpreter to see if it is resolved. | |
210 // We set bytecode_2() to _invokevirtual. | |
211 // See also interpreterRuntime.cpp. (8/25/2000) | |
212 // Only set resolved for the invokeinterface case if method is public. | |
213 // Otherwise, the method needs to be reresolved with caller for each | |
214 // interface call. | |
215 if (method->is_public()) set_bytecode_1(invoke_code); | |
216 set_bytecode_2(Bytecodes::_invokevirtual); | |
217 } else { | |
218 set_bytecode_2(invoke_code); | |
219 } | |
220 } else { | |
221 ShouldNotReachHere(); | |
222 } | |
223 NOT_PRODUCT(verify(tty)); | |
224 } | |
225 | |
226 | |
227 void ConstantPoolCacheEntry::set_interface_call(methodHandle method, int index) { | |
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228 assert(!is_secondary_entry(), ""); |
0 | 229 klassOop interf = method->method_holder(); |
230 assert(instanceKlass::cast(interf)->is_interface(), "must be an interface"); | |
231 set_f1(interf); | |
232 set_f2(index); | |
233 set_flags(as_flags(as_TosState(method->result_type()), method->is_final_method(), false, false, false, true) | method()->size_of_parameters()); | |
234 set_bytecode_1(Bytecodes::_invokeinterface); | |
235 } | |
236 | |
237 | |
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238 void ConstantPoolCacheEntry::initialize_bootstrap_method_index_in_cache(int bsm_cache_index) { |
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239 assert(!is_secondary_entry(), "only for JVM_CONSTANT_InvokeDynamic main entry"); |
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240 assert(_f2 == 0, "initialize once"); |
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241 assert(bsm_cache_index == (int)(u2)bsm_cache_index, "oob"); |
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242 set_f2(bsm_cache_index + constantPoolOopDesc::CPCACHE_INDEX_TAG); |
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243 } |
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244 |
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245 int ConstantPoolCacheEntry::bootstrap_method_index_in_cache() { |
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246 assert(!is_secondary_entry(), "only for JVM_CONSTANT_InvokeDynamic main entry"); |
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247 intptr_t bsm_cache_index = (intptr_t) _f2 - constantPoolOopDesc::CPCACHE_INDEX_TAG; |
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248 assert(bsm_cache_index == (intptr_t)(u2)bsm_cache_index, "oob"); |
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249 return (int) bsm_cache_index; |
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250 } |
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251 |
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252 void ConstantPoolCacheEntry::set_dynamic_call(Handle call_site, |
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253 methodHandle signature_invoker) { |
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254 assert(is_secondary_entry(), ""); |
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255 int param_size = signature_invoker->size_of_parameters(); |
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256 assert(param_size >= 1, "method argument size must include MH.this"); |
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257 param_size -= 1; // do not count MH.this; it is not stacked for invokedynamic |
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258 if (Atomic::cmpxchg_ptr(call_site(), &_f1, NULL) == NULL) { |
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259 // racing threads might be trying to install their own favorites |
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260 set_f1(call_site()); |
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261 } |
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262 bool is_final = true; |
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263 assert(signature_invoker->is_final_method(), "is_final"); |
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264 set_flags(as_flags(as_TosState(signature_invoker->result_type()), is_final, false, false, false, true) | param_size); |
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265 // do not do set_bytecode on a secondary CP cache entry |
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266 //set_bytecode_1(Bytecodes::_invokedynamic); |
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267 } |
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268 |
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269 |
0 | 270 class LocalOopClosure: public OopClosure { |
271 private: | |
272 void (*_f)(oop*); | |
273 | |
274 public: | |
275 LocalOopClosure(void f(oop*)) { _f = f; } | |
276 virtual void do_oop(oop* o) { _f(o); } | |
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277 virtual void do_oop(narrowOop *o) { ShouldNotReachHere(); } |
0 | 278 }; |
279 | |
280 | |
281 void ConstantPoolCacheEntry::oops_do(void f(oop*)) { | |
282 LocalOopClosure blk(f); | |
283 oop_iterate(&blk); | |
284 } | |
285 | |
286 | |
287 void ConstantPoolCacheEntry::oop_iterate(OopClosure* blk) { | |
288 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
289 // field[1] is always oop or NULL | |
290 blk->do_oop((oop*)&_f1); | |
291 if (is_vfinal()) { | |
292 blk->do_oop((oop*)&_f2); | |
293 } | |
294 } | |
295 | |
296 | |
297 void ConstantPoolCacheEntry::oop_iterate_m(OopClosure* blk, MemRegion mr) { | |
298 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
299 // field[1] is always oop or NULL | |
300 if (mr.contains((oop *)&_f1)) blk->do_oop((oop*)&_f1); | |
301 if (is_vfinal()) { | |
302 if (mr.contains((oop *)&_f2)) blk->do_oop((oop*)&_f2); | |
303 } | |
304 } | |
305 | |
306 | |
307 void ConstantPoolCacheEntry::follow_contents() { | |
308 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
309 // field[1] is always oop or NULL | |
310 MarkSweep::mark_and_push((oop*)&_f1); | |
311 if (is_vfinal()) { | |
312 MarkSweep::mark_and_push((oop*)&_f2); | |
313 } | |
314 } | |
315 | |
316 #ifndef SERIALGC | |
317 void ConstantPoolCacheEntry::follow_contents(ParCompactionManager* cm) { | |
318 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
319 // field[1] is always oop or NULL | |
320 PSParallelCompact::mark_and_push(cm, (oop*)&_f1); | |
321 if (is_vfinal()) { | |
322 PSParallelCompact::mark_and_push(cm, (oop*)&_f2); | |
323 } | |
324 } | |
325 #endif // SERIALGC | |
326 | |
327 void ConstantPoolCacheEntry::adjust_pointers() { | |
328 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
329 // field[1] is always oop or NULL | |
330 MarkSweep::adjust_pointer((oop*)&_f1); | |
331 if (is_vfinal()) { | |
332 MarkSweep::adjust_pointer((oop*)&_f2); | |
333 } | |
334 } | |
335 | |
336 #ifndef SERIALGC | |
337 void ConstantPoolCacheEntry::update_pointers() { | |
338 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
339 // field[1] is always oop or NULL | |
340 PSParallelCompact::adjust_pointer((oop*)&_f1); | |
341 if (is_vfinal()) { | |
342 PSParallelCompact::adjust_pointer((oop*)&_f2); | |
343 } | |
344 } | |
345 | |
346 void ConstantPoolCacheEntry::update_pointers(HeapWord* beg_addr, | |
347 HeapWord* end_addr) { | |
348 assert(in_words(size()) == 4, "check code below - may need adjustment"); | |
349 // field[1] is always oop or NULL | |
350 PSParallelCompact::adjust_pointer((oop*)&_f1, beg_addr, end_addr); | |
351 if (is_vfinal()) { | |
352 PSParallelCompact::adjust_pointer((oop*)&_f2, beg_addr, end_addr); | |
353 } | |
354 } | |
355 #endif // SERIALGC | |
356 | |
357 // RedefineClasses() API support: | |
358 // If this constantPoolCacheEntry refers to old_method then update it | |
359 // to refer to new_method. | |
360 bool ConstantPoolCacheEntry::adjust_method_entry(methodOop old_method, | |
361 methodOop new_method, bool * trace_name_printed) { | |
362 | |
363 if (is_vfinal()) { | |
364 // virtual and final so f2() contains method ptr instead of vtable index | |
365 if (f2() == (intptr_t)old_method) { | |
366 // match old_method so need an update | |
367 _f2 = (intptr_t)new_method; | |
368 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
369 if (!(*trace_name_printed)) { | |
370 // RC_TRACE_MESG macro has an embedded ResourceMark | |
371 RC_TRACE_MESG(("adjust: name=%s", | |
372 Klass::cast(old_method->method_holder())->external_name())); | |
373 *trace_name_printed = true; | |
374 } | |
375 // RC_TRACE macro has an embedded ResourceMark | |
376 RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)", | |
377 new_method->name()->as_C_string(), | |
378 new_method->signature()->as_C_string())); | |
379 } | |
380 | |
381 return true; | |
382 } | |
383 | |
384 // f1() is not used with virtual entries so bail out | |
385 return false; | |
386 } | |
387 | |
388 if ((oop)_f1 == NULL) { | |
389 // NULL f1() means this is a virtual entry so bail out | |
390 // We are assuming that the vtable index does not need change. | |
391 return false; | |
392 } | |
393 | |
394 if ((oop)_f1 == old_method) { | |
395 _f1 = new_method; | |
396 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
397 if (!(*trace_name_printed)) { | |
398 // RC_TRACE_MESG macro has an embedded ResourceMark | |
399 RC_TRACE_MESG(("adjust: name=%s", | |
400 Klass::cast(old_method->method_holder())->external_name())); | |
401 *trace_name_printed = true; | |
402 } | |
403 // RC_TRACE macro has an embedded ResourceMark | |
404 RC_TRACE(0x00400000, ("cpc entry update: %s(%s)", | |
405 new_method->name()->as_C_string(), | |
406 new_method->signature()->as_C_string())); | |
407 } | |
408 | |
409 return true; | |
410 } | |
411 | |
412 return false; | |
413 } | |
414 | |
415 bool ConstantPoolCacheEntry::is_interesting_method_entry(klassOop k) { | |
416 if (!is_method_entry()) { | |
417 // not a method entry so not interesting by default | |
418 return false; | |
419 } | |
420 | |
421 methodOop m = NULL; | |
422 if (is_vfinal()) { | |
423 // virtual and final so _f2 contains method ptr instead of vtable index | |
424 m = (methodOop)_f2; | |
425 } else if ((oop)_f1 == NULL) { | |
426 // NULL _f1 means this is a virtual entry so also not interesting | |
427 return false; | |
428 } else { | |
429 if (!((oop)_f1)->is_method()) { | |
430 // _f1 can also contain a klassOop for an interface | |
431 return false; | |
432 } | |
433 m = (methodOop)_f1; | |
434 } | |
435 | |
436 assert(m != NULL && m->is_method(), "sanity check"); | |
437 if (m == NULL || !m->is_method() || m->method_holder() != k) { | |
438 // robustness for above sanity checks or method is not in | |
439 // the interesting class | |
440 return false; | |
441 } | |
442 | |
443 // the method is in the interesting class so the entry is interesting | |
444 return true; | |
445 } | |
446 | |
447 void ConstantPoolCacheEntry::print(outputStream* st, int index) const { | |
448 // print separator | |
449 if (index == 0) tty->print_cr(" -------------"); | |
450 // print entry | |
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451 tty->print("%3d ("PTR_FORMAT") ", index, (intptr_t)this); |
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452 if (is_secondary_entry()) |
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453 tty->print_cr("[%5d|secondary]", main_entry_index()); |
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454 else |
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455 tty->print_cr("[%02x|%02x|%5d]", bytecode_2(), bytecode_1(), constant_pool_index()); |
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456 tty->print_cr(" [ "PTR_FORMAT"]", (intptr_t)(oop)_f1); |
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457 tty->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f2); |
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458 tty->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_flags); |
0 | 459 tty->print_cr(" -------------"); |
460 } | |
461 | |
462 void ConstantPoolCacheEntry::verify(outputStream* st) const { | |
463 // not implemented yet | |
464 } | |
465 | |
466 // Implementation of ConstantPoolCache | |
467 | |
468 void constantPoolCacheOopDesc::initialize(intArray& inverse_index_map) { | |
469 assert(inverse_index_map.length() == length(), "inverse index map must have same length as cache"); | |
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470 for (int i = 0; i < length(); i++) { |
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471 ConstantPoolCacheEntry* e = entry_at(i); |
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472 int original_index = inverse_index_map[i]; |
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473 if ((original_index & Rewriter::_secondary_entry_tag) != 0) { |
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474 int main_index = (original_index - Rewriter::_secondary_entry_tag); |
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475 assert(!entry_at(main_index)->is_secondary_entry(), "valid main index"); |
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476 e->initialize_secondary_entry(main_index); |
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477 } else { |
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478 e->initialize_entry(original_index); |
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479 } |
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480 assert(entry_at(i) == e, "sanity"); |
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481 } |
0 | 482 } |
483 | |
484 // RedefineClasses() API support: | |
485 // If any entry of this constantPoolCache points to any of | |
486 // old_methods, replace it with the corresponding new_method. | |
487 void constantPoolCacheOopDesc::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
488 int methods_length, bool * trace_name_printed) { | |
489 | |
490 if (methods_length == 0) { | |
491 // nothing to do if there are no methods | |
492 return; | |
493 } | |
494 | |
495 // get shorthand for the interesting class | |
496 klassOop old_holder = old_methods[0]->method_holder(); | |
497 | |
498 for (int i = 0; i < length(); i++) { | |
499 if (!entry_at(i)->is_interesting_method_entry(old_holder)) { | |
500 // skip uninteresting methods | |
501 continue; | |
502 } | |
503 | |
504 // The constantPoolCache contains entries for several different | |
505 // things, but we only care about methods. In fact, we only care | |
506 // about methods in the same class as the one that contains the | |
507 // old_methods. At this point, we have an interesting entry. | |
508 | |
509 for (int j = 0; j < methods_length; j++) { | |
510 methodOop old_method = old_methods[j]; | |
511 methodOop new_method = new_methods[j]; | |
512 | |
513 if (entry_at(i)->adjust_method_entry(old_method, new_method, | |
514 trace_name_printed)) { | |
515 // current old_method matched this entry and we updated it so | |
516 // break out and get to the next interesting entry if there one | |
517 break; | |
518 } | |
519 } | |
520 } | |
521 } |