Mercurial > hg > truffle
annotate src/share/vm/opto/graphKit.cpp @ 909:b32a809aab08
6866585: debug code in ciObjectFactory too slow for large objects
Reviewed-by: ysr, never, kvn
author | jcoomes |
---|---|
date | Tue, 11 Aug 2009 23:24:41 -0700 |
parents | 9987d9d5eb0e |
children | 8fe1963e3964 |
rev | line source |
---|---|
0 | 1 /* |
579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_graphKit.cpp.incl" | |
27 | |
28 //----------------------------GraphKit----------------------------------------- | |
29 // Main utility constructor. | |
30 GraphKit::GraphKit(JVMState* jvms) | |
31 : Phase(Phase::Parser), | |
32 _env(C->env()), | |
33 _gvn(*C->initial_gvn()) | |
34 { | |
35 _exceptions = jvms->map()->next_exception(); | |
36 if (_exceptions != NULL) jvms->map()->set_next_exception(NULL); | |
37 set_jvms(jvms); | |
38 } | |
39 | |
40 // Private constructor for parser. | |
41 GraphKit::GraphKit() | |
42 : Phase(Phase::Parser), | |
43 _env(C->env()), | |
44 _gvn(*C->initial_gvn()) | |
45 { | |
46 _exceptions = NULL; | |
47 set_map(NULL); | |
48 debug_only(_sp = -99); | |
49 debug_only(set_bci(-99)); | |
50 } | |
51 | |
52 | |
53 | |
54 //---------------------------clean_stack--------------------------------------- | |
55 // Clear away rubbish from the stack area of the JVM state. | |
56 // This destroys any arguments that may be waiting on the stack. | |
57 void GraphKit::clean_stack(int from_sp) { | |
58 SafePointNode* map = this->map(); | |
59 JVMState* jvms = this->jvms(); | |
60 int stk_size = jvms->stk_size(); | |
61 int stkoff = jvms->stkoff(); | |
62 Node* top = this->top(); | |
63 for (int i = from_sp; i < stk_size; i++) { | |
64 if (map->in(stkoff + i) != top) { | |
65 map->set_req(stkoff + i, top); | |
66 } | |
67 } | |
68 } | |
69 | |
70 | |
71 //--------------------------------sync_jvms----------------------------------- | |
72 // Make sure our current jvms agrees with our parse state. | |
73 JVMState* GraphKit::sync_jvms() const { | |
74 JVMState* jvms = this->jvms(); | |
75 jvms->set_bci(bci()); // Record the new bci in the JVMState | |
76 jvms->set_sp(sp()); // Record the new sp in the JVMState | |
77 assert(jvms_in_sync(), "jvms is now in sync"); | |
78 return jvms; | |
79 } | |
80 | |
81 #ifdef ASSERT | |
82 bool GraphKit::jvms_in_sync() const { | |
83 Parse* parse = is_Parse(); | |
84 if (parse == NULL) { | |
85 if (bci() != jvms()->bci()) return false; | |
86 if (sp() != (int)jvms()->sp()) return false; | |
87 return true; | |
88 } | |
89 if (jvms()->method() != parse->method()) return false; | |
90 if (jvms()->bci() != parse->bci()) return false; | |
91 int jvms_sp = jvms()->sp(); | |
92 if (jvms_sp != parse->sp()) return false; | |
93 int jvms_depth = jvms()->depth(); | |
94 if (jvms_depth != parse->depth()) return false; | |
95 return true; | |
96 } | |
97 | |
98 // Local helper checks for special internal merge points | |
99 // used to accumulate and merge exception states. | |
100 // They are marked by the region's in(0) edge being the map itself. | |
101 // Such merge points must never "escape" into the parser at large, | |
102 // until they have been handed to gvn.transform. | |
103 static bool is_hidden_merge(Node* reg) { | |
104 if (reg == NULL) return false; | |
105 if (reg->is_Phi()) { | |
106 reg = reg->in(0); | |
107 if (reg == NULL) return false; | |
108 } | |
109 return reg->is_Region() && reg->in(0) != NULL && reg->in(0)->is_Root(); | |
110 } | |
111 | |
112 void GraphKit::verify_map() const { | |
113 if (map() == NULL) return; // null map is OK | |
114 assert(map()->req() <= jvms()->endoff(), "no extra garbage on map"); | |
115 assert(!map()->has_exceptions(), "call add_exception_states_from 1st"); | |
116 assert(!is_hidden_merge(control()), "call use_exception_state, not set_map"); | |
117 } | |
118 | |
119 void GraphKit::verify_exception_state(SafePointNode* ex_map) { | |
120 assert(ex_map->next_exception() == NULL, "not already part of a chain"); | |
121 assert(has_saved_ex_oop(ex_map), "every exception state has an ex_oop"); | |
122 } | |
123 #endif | |
124 | |
125 //---------------------------stop_and_kill_map--------------------------------- | |
126 // Set _map to NULL, signalling a stop to further bytecode execution. | |
127 // First smash the current map's control to a constant, to mark it dead. | |
128 void GraphKit::stop_and_kill_map() { | |
129 SafePointNode* dead_map = stop(); | |
130 if (dead_map != NULL) { | |
131 dead_map->disconnect_inputs(NULL); // Mark the map as killed. | |
132 assert(dead_map->is_killed(), "must be so marked"); | |
133 } | |
134 } | |
135 | |
136 | |
137 //--------------------------------stopped-------------------------------------- | |
138 // Tell if _map is NULL, or control is top. | |
139 bool GraphKit::stopped() { | |
140 if (map() == NULL) return true; | |
141 else if (control() == top()) return true; | |
142 else return false; | |
143 } | |
144 | |
145 | |
146 //-----------------------------has_ex_handler---------------------------------- | |
147 // Tell if this method or any caller method has exception handlers. | |
148 bool GraphKit::has_ex_handler() { | |
149 for (JVMState* jvmsp = jvms(); jvmsp != NULL; jvmsp = jvmsp->caller()) { | |
150 if (jvmsp->has_method() && jvmsp->method()->has_exception_handlers()) { | |
151 return true; | |
152 } | |
153 } | |
154 return false; | |
155 } | |
156 | |
157 //------------------------------save_ex_oop------------------------------------ | |
158 // Save an exception without blowing stack contents or other JVM state. | |
159 void GraphKit::set_saved_ex_oop(SafePointNode* ex_map, Node* ex_oop) { | |
160 assert(!has_saved_ex_oop(ex_map), "clear ex-oop before setting again"); | |
161 ex_map->add_req(ex_oop); | |
162 debug_only(verify_exception_state(ex_map)); | |
163 } | |
164 | |
165 inline static Node* common_saved_ex_oop(SafePointNode* ex_map, bool clear_it) { | |
166 assert(GraphKit::has_saved_ex_oop(ex_map), "ex_oop must be there"); | |
167 Node* ex_oop = ex_map->in(ex_map->req()-1); | |
168 if (clear_it) ex_map->del_req(ex_map->req()-1); | |
169 return ex_oop; | |
170 } | |
171 | |
172 //-----------------------------saved_ex_oop------------------------------------ | |
173 // Recover a saved exception from its map. | |
174 Node* GraphKit::saved_ex_oop(SafePointNode* ex_map) { | |
175 return common_saved_ex_oop(ex_map, false); | |
176 } | |
177 | |
178 //--------------------------clear_saved_ex_oop--------------------------------- | |
179 // Erase a previously saved exception from its map. | |
180 Node* GraphKit::clear_saved_ex_oop(SafePointNode* ex_map) { | |
181 return common_saved_ex_oop(ex_map, true); | |
182 } | |
183 | |
184 #ifdef ASSERT | |
185 //---------------------------has_saved_ex_oop---------------------------------- | |
186 // Erase a previously saved exception from its map. | |
187 bool GraphKit::has_saved_ex_oop(SafePointNode* ex_map) { | |
188 return ex_map->req() == ex_map->jvms()->endoff()+1; | |
189 } | |
190 #endif | |
191 | |
192 //-------------------------make_exception_state-------------------------------- | |
193 // Turn the current JVM state into an exception state, appending the ex_oop. | |
194 SafePointNode* GraphKit::make_exception_state(Node* ex_oop) { | |
195 sync_jvms(); | |
196 SafePointNode* ex_map = stop(); // do not manipulate this map any more | |
197 set_saved_ex_oop(ex_map, ex_oop); | |
198 return ex_map; | |
199 } | |
200 | |
201 | |
202 //--------------------------add_exception_state-------------------------------- | |
203 // Add an exception to my list of exceptions. | |
204 void GraphKit::add_exception_state(SafePointNode* ex_map) { | |
205 if (ex_map == NULL || ex_map->control() == top()) { | |
206 return; | |
207 } | |
208 #ifdef ASSERT | |
209 verify_exception_state(ex_map); | |
210 if (has_exceptions()) { | |
211 assert(ex_map->jvms()->same_calls_as(_exceptions->jvms()), "all collected exceptions must come from the same place"); | |
212 } | |
213 #endif | |
214 | |
215 // If there is already an exception of exactly this type, merge with it. | |
216 // In particular, null-checks and other low-level exceptions common up here. | |
217 Node* ex_oop = saved_ex_oop(ex_map); | |
218 const Type* ex_type = _gvn.type(ex_oop); | |
219 if (ex_oop == top()) { | |
220 // No action needed. | |
221 return; | |
222 } | |
223 assert(ex_type->isa_instptr(), "exception must be an instance"); | |
224 for (SafePointNode* e2 = _exceptions; e2 != NULL; e2 = e2->next_exception()) { | |
225 const Type* ex_type2 = _gvn.type(saved_ex_oop(e2)); | |
226 // We check sp also because call bytecodes can generate exceptions | |
227 // both before and after arguments are popped! | |
228 if (ex_type2 == ex_type | |
229 && e2->_jvms->sp() == ex_map->_jvms->sp()) { | |
230 combine_exception_states(ex_map, e2); | |
231 return; | |
232 } | |
233 } | |
234 | |
235 // No pre-existing exception of the same type. Chain it on the list. | |
236 push_exception_state(ex_map); | |
237 } | |
238 | |
239 //-----------------------add_exception_states_from----------------------------- | |
240 void GraphKit::add_exception_states_from(JVMState* jvms) { | |
241 SafePointNode* ex_map = jvms->map()->next_exception(); | |
242 if (ex_map != NULL) { | |
243 jvms->map()->set_next_exception(NULL); | |
244 for (SafePointNode* next_map; ex_map != NULL; ex_map = next_map) { | |
245 next_map = ex_map->next_exception(); | |
246 ex_map->set_next_exception(NULL); | |
247 add_exception_state(ex_map); | |
248 } | |
249 } | |
250 } | |
251 | |
252 //-----------------------transfer_exceptions_into_jvms------------------------- | |
253 JVMState* GraphKit::transfer_exceptions_into_jvms() { | |
254 if (map() == NULL) { | |
255 // We need a JVMS to carry the exceptions, but the map has gone away. | |
256 // Create a scratch JVMS, cloned from any of the exception states... | |
257 if (has_exceptions()) { | |
258 _map = _exceptions; | |
259 _map = clone_map(); | |
260 _map->set_next_exception(NULL); | |
261 clear_saved_ex_oop(_map); | |
262 debug_only(verify_map()); | |
263 } else { | |
264 // ...or created from scratch | |
265 JVMState* jvms = new (C) JVMState(_method, NULL); | |
266 jvms->set_bci(_bci); | |
267 jvms->set_sp(_sp); | |
268 jvms->set_map(new (C, TypeFunc::Parms) SafePointNode(TypeFunc::Parms, jvms)); | |
269 set_jvms(jvms); | |
270 for (uint i = 0; i < map()->req(); i++) map()->init_req(i, top()); | |
271 set_all_memory(top()); | |
272 while (map()->req() < jvms->endoff()) map()->add_req(top()); | |
273 } | |
274 // (This is a kludge, in case you didn't notice.) | |
275 set_control(top()); | |
276 } | |
277 JVMState* jvms = sync_jvms(); | |
278 assert(!jvms->map()->has_exceptions(), "no exceptions on this map yet"); | |
279 jvms->map()->set_next_exception(_exceptions); | |
280 _exceptions = NULL; // done with this set of exceptions | |
281 return jvms; | |
282 } | |
283 | |
284 static inline void add_n_reqs(Node* dstphi, Node* srcphi) { | |
285 assert(is_hidden_merge(dstphi), "must be a special merge node"); | |
286 assert(is_hidden_merge(srcphi), "must be a special merge node"); | |
287 uint limit = srcphi->req(); | |
288 for (uint i = PhiNode::Input; i < limit; i++) { | |
289 dstphi->add_req(srcphi->in(i)); | |
290 } | |
291 } | |
292 static inline void add_one_req(Node* dstphi, Node* src) { | |
293 assert(is_hidden_merge(dstphi), "must be a special merge node"); | |
294 assert(!is_hidden_merge(src), "must not be a special merge node"); | |
295 dstphi->add_req(src); | |
296 } | |
297 | |
298 //-----------------------combine_exception_states------------------------------ | |
299 // This helper function combines exception states by building phis on a | |
300 // specially marked state-merging region. These regions and phis are | |
301 // untransformed, and can build up gradually. The region is marked by | |
302 // having a control input of its exception map, rather than NULL. Such | |
303 // regions do not appear except in this function, and in use_exception_state. | |
304 void GraphKit::combine_exception_states(SafePointNode* ex_map, SafePointNode* phi_map) { | |
305 if (failing()) return; // dying anyway... | |
306 JVMState* ex_jvms = ex_map->_jvms; | |
307 assert(ex_jvms->same_calls_as(phi_map->_jvms), "consistent call chains"); | |
308 assert(ex_jvms->stkoff() == phi_map->_jvms->stkoff(), "matching locals"); | |
309 assert(ex_jvms->sp() == phi_map->_jvms->sp(), "matching stack sizes"); | |
310 assert(ex_jvms->monoff() == phi_map->_jvms->monoff(), "matching JVMS"); | |
311 assert(ex_map->req() == phi_map->req(), "matching maps"); | |
312 uint tos = ex_jvms->stkoff() + ex_jvms->sp(); | |
313 Node* hidden_merge_mark = root(); | |
314 Node* region = phi_map->control(); | |
315 MergeMemNode* phi_mem = phi_map->merged_memory(); | |
316 MergeMemNode* ex_mem = ex_map->merged_memory(); | |
317 if (region->in(0) != hidden_merge_mark) { | |
318 // The control input is not (yet) a specially-marked region in phi_map. | |
319 // Make it so, and build some phis. | |
320 region = new (C, 2) RegionNode(2); | |
321 _gvn.set_type(region, Type::CONTROL); | |
322 region->set_req(0, hidden_merge_mark); // marks an internal ex-state | |
323 region->init_req(1, phi_map->control()); | |
324 phi_map->set_control(region); | |
325 Node* io_phi = PhiNode::make(region, phi_map->i_o(), Type::ABIO); | |
326 record_for_igvn(io_phi); | |
327 _gvn.set_type(io_phi, Type::ABIO); | |
328 phi_map->set_i_o(io_phi); | |
329 for (MergeMemStream mms(phi_mem); mms.next_non_empty(); ) { | |
330 Node* m = mms.memory(); | |
331 Node* m_phi = PhiNode::make(region, m, Type::MEMORY, mms.adr_type(C)); | |
332 record_for_igvn(m_phi); | |
333 _gvn.set_type(m_phi, Type::MEMORY); | |
334 mms.set_memory(m_phi); | |
335 } | |
336 } | |
337 | |
338 // Either or both of phi_map and ex_map might already be converted into phis. | |
339 Node* ex_control = ex_map->control(); | |
340 // if there is special marking on ex_map also, we add multiple edges from src | |
341 bool add_multiple = (ex_control->in(0) == hidden_merge_mark); | |
342 // how wide was the destination phi_map, originally? | |
343 uint orig_width = region->req(); | |
344 | |
345 if (add_multiple) { | |
346 add_n_reqs(region, ex_control); | |
347 add_n_reqs(phi_map->i_o(), ex_map->i_o()); | |
348 } else { | |
349 // ex_map has no merges, so we just add single edges everywhere | |
350 add_one_req(region, ex_control); | |
351 add_one_req(phi_map->i_o(), ex_map->i_o()); | |
352 } | |
353 for (MergeMemStream mms(phi_mem, ex_mem); mms.next_non_empty2(); ) { | |
354 if (mms.is_empty()) { | |
355 // get a copy of the base memory, and patch some inputs into it | |
356 const TypePtr* adr_type = mms.adr_type(C); | |
357 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type); | |
358 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), ""); | |
359 mms.set_memory(phi); | |
360 // Prepare to append interesting stuff onto the newly sliced phi: | |
361 while (phi->req() > orig_width) phi->del_req(phi->req()-1); | |
362 } | |
363 // Append stuff from ex_map: | |
364 if (add_multiple) { | |
365 add_n_reqs(mms.memory(), mms.memory2()); | |
366 } else { | |
367 add_one_req(mms.memory(), mms.memory2()); | |
368 } | |
369 } | |
370 uint limit = ex_map->req(); | |
371 for (uint i = TypeFunc::Parms; i < limit; i++) { | |
372 // Skip everything in the JVMS after tos. (The ex_oop follows.) | |
373 if (i == tos) i = ex_jvms->monoff(); | |
374 Node* src = ex_map->in(i); | |
375 Node* dst = phi_map->in(i); | |
376 if (src != dst) { | |
377 PhiNode* phi; | |
378 if (dst->in(0) != region) { | |
379 dst = phi = PhiNode::make(region, dst, _gvn.type(dst)); | |
380 record_for_igvn(phi); | |
381 _gvn.set_type(phi, phi->type()); | |
382 phi_map->set_req(i, dst); | |
383 // Prepare to append interesting stuff onto the new phi: | |
384 while (dst->req() > orig_width) dst->del_req(dst->req()-1); | |
385 } else { | |
386 assert(dst->is_Phi(), "nobody else uses a hidden region"); | |
387 phi = (PhiNode*)dst; | |
388 } | |
389 if (add_multiple && src->in(0) == ex_control) { | |
390 // Both are phis. | |
391 add_n_reqs(dst, src); | |
392 } else { | |
393 while (dst->req() < region->req()) add_one_req(dst, src); | |
394 } | |
395 const Type* srctype = _gvn.type(src); | |
396 if (phi->type() != srctype) { | |
397 const Type* dsttype = phi->type()->meet(srctype); | |
398 if (phi->type() != dsttype) { | |
399 phi->set_type(dsttype); | |
400 _gvn.set_type(phi, dsttype); | |
401 } | |
402 } | |
403 } | |
404 } | |
405 } | |
406 | |
407 //--------------------------use_exception_state-------------------------------- | |
408 Node* GraphKit::use_exception_state(SafePointNode* phi_map) { | |
409 if (failing()) { stop(); return top(); } | |
410 Node* region = phi_map->control(); | |
411 Node* hidden_merge_mark = root(); | |
412 assert(phi_map->jvms()->map() == phi_map, "sanity: 1-1 relation"); | |
413 Node* ex_oop = clear_saved_ex_oop(phi_map); | |
414 if (region->in(0) == hidden_merge_mark) { | |
415 // Special marking for internal ex-states. Process the phis now. | |
416 region->set_req(0, region); // now it's an ordinary region | |
417 set_jvms(phi_map->jvms()); // ...so now we can use it as a map | |
418 // Note: Setting the jvms also sets the bci and sp. | |
419 set_control(_gvn.transform(region)); | |
420 uint tos = jvms()->stkoff() + sp(); | |
421 for (uint i = 1; i < tos; i++) { | |
422 Node* x = phi_map->in(i); | |
423 if (x->in(0) == region) { | |
424 assert(x->is_Phi(), "expected a special phi"); | |
425 phi_map->set_req(i, _gvn.transform(x)); | |
426 } | |
427 } | |
428 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) { | |
429 Node* x = mms.memory(); | |
430 if (x->in(0) == region) { | |
431 assert(x->is_Phi(), "nobody else uses a hidden region"); | |
432 mms.set_memory(_gvn.transform(x)); | |
433 } | |
434 } | |
435 if (ex_oop->in(0) == region) { | |
436 assert(ex_oop->is_Phi(), "expected a special phi"); | |
437 ex_oop = _gvn.transform(ex_oop); | |
438 } | |
439 } else { | |
440 set_jvms(phi_map->jvms()); | |
441 } | |
442 | |
443 assert(!is_hidden_merge(phi_map->control()), "hidden ex. states cleared"); | |
444 assert(!is_hidden_merge(phi_map->i_o()), "hidden ex. states cleared"); | |
445 return ex_oop; | |
446 } | |
447 | |
448 //---------------------------------java_bc------------------------------------- | |
449 Bytecodes::Code GraphKit::java_bc() const { | |
450 ciMethod* method = this->method(); | |
451 int bci = this->bci(); | |
452 if (method != NULL && bci != InvocationEntryBci) | |
453 return method->java_code_at_bci(bci); | |
454 else | |
455 return Bytecodes::_illegal; | |
456 } | |
457 | |
458 //------------------------------builtin_throw---------------------------------- | |
459 void GraphKit::builtin_throw(Deoptimization::DeoptReason reason, Node* arg) { | |
460 bool must_throw = true; | |
461 | |
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462 if (env()->jvmti_can_post_exceptions()) { |
0 | 463 // Do not try anything fancy if we're notifying the VM on every throw. |
464 // Cf. case Bytecodes::_athrow in parse2.cpp. | |
465 uncommon_trap(reason, Deoptimization::Action_none, | |
466 (ciKlass*)NULL, (char*)NULL, must_throw); | |
467 return; | |
468 } | |
469 | |
470 // If this particular condition has not yet happened at this | |
471 // bytecode, then use the uncommon trap mechanism, and allow for | |
472 // a future recompilation if several traps occur here. | |
473 // If the throw is hot, try to use a more complicated inline mechanism | |
474 // which keeps execution inside the compiled code. | |
475 bool treat_throw_as_hot = false; | |
476 ciMethodData* md = method()->method_data(); | |
477 | |
478 if (ProfileTraps) { | |
479 if (too_many_traps(reason)) { | |
480 treat_throw_as_hot = true; | |
481 } | |
482 // (If there is no MDO at all, assume it is early in | |
483 // execution, and that any deopts are part of the | |
484 // startup transient, and don't need to be remembered.) | |
485 | |
486 // Also, if there is a local exception handler, treat all throws | |
487 // as hot if there has been at least one in this method. | |
488 if (C->trap_count(reason) != 0 | |
489 && method()->method_data()->trap_count(reason) != 0 | |
490 && has_ex_handler()) { | |
491 treat_throw_as_hot = true; | |
492 } | |
493 } | |
494 | |
495 // If this throw happens frequently, an uncommon trap might cause | |
496 // a performance pothole. If there is a local exception handler, | |
497 // and if this particular bytecode appears to be deoptimizing often, | |
498 // let us handle the throw inline, with a preconstructed instance. | |
499 // Note: If the deopt count has blown up, the uncommon trap | |
500 // runtime is going to flush this nmethod, not matter what. | |
501 if (treat_throw_as_hot | |
502 && (!StackTraceInThrowable || OmitStackTraceInFastThrow)) { | |
503 // If the throw is local, we use a pre-existing instance and | |
504 // punt on the backtrace. This would lead to a missing backtrace | |
505 // (a repeat of 4292742) if the backtrace object is ever asked | |
506 // for its backtrace. | |
507 // Fixing this remaining case of 4292742 requires some flavor of | |
508 // escape analysis. Leave that for the future. | |
509 ciInstance* ex_obj = NULL; | |
510 switch (reason) { | |
511 case Deoptimization::Reason_null_check: | |
512 ex_obj = env()->NullPointerException_instance(); | |
513 break; | |
514 case Deoptimization::Reason_div0_check: | |
515 ex_obj = env()->ArithmeticException_instance(); | |
516 break; | |
517 case Deoptimization::Reason_range_check: | |
518 ex_obj = env()->ArrayIndexOutOfBoundsException_instance(); | |
519 break; | |
520 case Deoptimization::Reason_class_check: | |
521 if (java_bc() == Bytecodes::_aastore) { | |
522 ex_obj = env()->ArrayStoreException_instance(); | |
523 } else { | |
524 ex_obj = env()->ClassCastException_instance(); | |
525 } | |
526 break; | |
527 } | |
528 if (failing()) { stop(); return; } // exception allocation might fail | |
529 if (ex_obj != NULL) { | |
530 // Cheat with a preallocated exception object. | |
531 if (C->log() != NULL) | |
532 C->log()->elem("hot_throw preallocated='1' reason='%s'", | |
533 Deoptimization::trap_reason_name(reason)); | |
534 const TypeInstPtr* ex_con = TypeInstPtr::make(ex_obj); | |
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535 Node* ex_node = _gvn.transform( ConNode::make(C, ex_con) ); |
0 | 536 |
537 // Clear the detail message of the preallocated exception object. | |
538 // Weblogic sometimes mutates the detail message of exceptions | |
539 // using reflection. | |
540 int offset = java_lang_Throwable::get_detailMessage_offset(); | |
541 const TypePtr* adr_typ = ex_con->add_offset(offset); | |
542 | |
543 Node *adr = basic_plus_adr(ex_node, ex_node, offset); | |
544 Node *store = store_oop_to_object(control(), ex_node, adr, adr_typ, null(), ex_con, T_OBJECT); | |
545 | |
546 add_exception_state(make_exception_state(ex_node)); | |
547 return; | |
548 } | |
549 } | |
550 | |
551 // %%% Maybe add entry to OptoRuntime which directly throws the exc.? | |
552 // It won't be much cheaper than bailing to the interp., since we'll | |
553 // have to pass up all the debug-info, and the runtime will have to | |
554 // create the stack trace. | |
555 | |
556 // Usual case: Bail to interpreter. | |
557 // Reserve the right to recompile if we haven't seen anything yet. | |
558 | |
559 Deoptimization::DeoptAction action = Deoptimization::Action_maybe_recompile; | |
560 if (treat_throw_as_hot | |
561 && (method()->method_data()->trap_recompiled_at(bci()) | |
562 || C->too_many_traps(reason))) { | |
563 // We cannot afford to take more traps here. Suffer in the interpreter. | |
564 if (C->log() != NULL) | |
565 C->log()->elem("hot_throw preallocated='0' reason='%s' mcount='%d'", | |
566 Deoptimization::trap_reason_name(reason), | |
567 C->trap_count(reason)); | |
568 action = Deoptimization::Action_none; | |
569 } | |
570 | |
571 // "must_throw" prunes the JVM state to include only the stack, if there | |
572 // are no local exception handlers. This should cut down on register | |
573 // allocation time and code size, by drastically reducing the number | |
574 // of in-edges on the call to the uncommon trap. | |
575 | |
576 uncommon_trap(reason, action, (ciKlass*)NULL, (char*)NULL, must_throw); | |
577 } | |
578 | |
579 | |
580 //----------------------------PreserveJVMState--------------------------------- | |
581 PreserveJVMState::PreserveJVMState(GraphKit* kit, bool clone_map) { | |
582 debug_only(kit->verify_map()); | |
583 _kit = kit; | |
584 _map = kit->map(); // preserve the map | |
585 _sp = kit->sp(); | |
586 kit->set_map(clone_map ? kit->clone_map() : NULL); | |
587 #ifdef ASSERT | |
588 _bci = kit->bci(); | |
589 Parse* parser = kit->is_Parse(); | |
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590 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); |
0 | 591 _block = block; |
592 #endif | |
593 } | |
594 PreserveJVMState::~PreserveJVMState() { | |
595 GraphKit* kit = _kit; | |
596 #ifdef ASSERT | |
597 assert(kit->bci() == _bci, "bci must not shift"); | |
598 Parse* parser = kit->is_Parse(); | |
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599 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); |
0 | 600 assert(block == _block, "block must not shift"); |
601 #endif | |
602 kit->set_map(_map); | |
603 kit->set_sp(_sp); | |
604 } | |
605 | |
606 | |
607 //-----------------------------BuildCutout------------------------------------- | |
608 BuildCutout::BuildCutout(GraphKit* kit, Node* p, float prob, float cnt) | |
609 : PreserveJVMState(kit) | |
610 { | |
611 assert(p->is_Con() || p->is_Bool(), "test must be a bool"); | |
612 SafePointNode* outer_map = _map; // preserved map is caller's | |
613 SafePointNode* inner_map = kit->map(); | |
614 IfNode* iff = kit->create_and_map_if(outer_map->control(), p, prob, cnt); | |
615 outer_map->set_control(kit->gvn().transform( new (kit->C, 1) IfTrueNode(iff) )); | |
616 inner_map->set_control(kit->gvn().transform( new (kit->C, 1) IfFalseNode(iff) )); | |
617 } | |
618 BuildCutout::~BuildCutout() { | |
619 GraphKit* kit = _kit; | |
620 assert(kit->stopped(), "cutout code must stop, throw, return, etc."); | |
621 } | |
622 | |
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623 //---------------------------PreserveReexecuteState---------------------------- |
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624 PreserveReexecuteState::PreserveReexecuteState(GraphKit* kit) { |
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625 _kit = kit; |
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626 _sp = kit->sp(); |
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627 _reexecute = kit->jvms()->_reexecute; |
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628 } |
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629 PreserveReexecuteState::~PreserveReexecuteState() { |
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630 _kit->jvms()->_reexecute = _reexecute; |
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631 _kit->set_sp(_sp); |
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632 } |
0 | 633 |
634 //------------------------------clone_map-------------------------------------- | |
635 // Implementation of PreserveJVMState | |
636 // | |
637 // Only clone_map(...) here. If this function is only used in the | |
638 // PreserveJVMState class we may want to get rid of this extra | |
639 // function eventually and do it all there. | |
640 | |
641 SafePointNode* GraphKit::clone_map() { | |
642 if (map() == NULL) return NULL; | |
643 | |
644 // Clone the memory edge first | |
645 Node* mem = MergeMemNode::make(C, map()->memory()); | |
646 gvn().set_type_bottom(mem); | |
647 | |
648 SafePointNode *clonemap = (SafePointNode*)map()->clone(); | |
649 JVMState* jvms = this->jvms(); | |
650 JVMState* clonejvms = jvms->clone_shallow(C); | |
651 clonemap->set_memory(mem); | |
652 clonemap->set_jvms(clonejvms); | |
653 clonejvms->set_map(clonemap); | |
654 record_for_igvn(clonemap); | |
655 gvn().set_type_bottom(clonemap); | |
656 return clonemap; | |
657 } | |
658 | |
659 | |
660 //-----------------------------set_map_clone----------------------------------- | |
661 void GraphKit::set_map_clone(SafePointNode* m) { | |
662 _map = m; | |
663 _map = clone_map(); | |
664 _map->set_next_exception(NULL); | |
665 debug_only(verify_map()); | |
666 } | |
667 | |
668 | |
669 //----------------------------kill_dead_locals--------------------------------- | |
670 // Detect any locals which are known to be dead, and force them to top. | |
671 void GraphKit::kill_dead_locals() { | |
672 // Consult the liveness information for the locals. If any | |
673 // of them are unused, then they can be replaced by top(). This | |
674 // should help register allocation time and cut down on the size | |
675 // of the deoptimization information. | |
676 | |
677 // This call is made from many of the bytecode handling | |
678 // subroutines called from the Big Switch in do_one_bytecode. | |
679 // Every bytecode which might include a slow path is responsible | |
680 // for killing its dead locals. The more consistent we | |
681 // are about killing deads, the fewer useless phis will be | |
682 // constructed for them at various merge points. | |
683 | |
684 // bci can be -1 (InvocationEntryBci). We return the entry | |
685 // liveness for the method. | |
686 | |
687 if (method() == NULL || method()->code_size() == 0) { | |
688 // We are building a graph for a call to a native method. | |
689 // All locals are live. | |
690 return; | |
691 } | |
692 | |
693 ResourceMark rm; | |
694 | |
695 // Consult the liveness information for the locals. If any | |
696 // of them are unused, then they can be replaced by top(). This | |
697 // should help register allocation time and cut down on the size | |
698 // of the deoptimization information. | |
699 MethodLivenessResult live_locals = method()->liveness_at_bci(bci()); | |
700 | |
701 int len = (int)live_locals.size(); | |
702 assert(len <= jvms()->loc_size(), "too many live locals"); | |
703 for (int local = 0; local < len; local++) { | |
704 if (!live_locals.at(local)) { | |
705 set_local(local, top()); | |
706 } | |
707 } | |
708 } | |
709 | |
710 #ifdef ASSERT | |
711 //-------------------------dead_locals_are_killed------------------------------ | |
712 // Return true if all dead locals are set to top in the map. | |
713 // Used to assert "clean" debug info at various points. | |
714 bool GraphKit::dead_locals_are_killed() { | |
715 if (method() == NULL || method()->code_size() == 0) { | |
716 // No locals need to be dead, so all is as it should be. | |
717 return true; | |
718 } | |
719 | |
720 // Make sure somebody called kill_dead_locals upstream. | |
721 ResourceMark rm; | |
722 for (JVMState* jvms = this->jvms(); jvms != NULL; jvms = jvms->caller()) { | |
723 if (jvms->loc_size() == 0) continue; // no locals to consult | |
724 SafePointNode* map = jvms->map(); | |
725 ciMethod* method = jvms->method(); | |
726 int bci = jvms->bci(); | |
727 if (jvms == this->jvms()) { | |
728 bci = this->bci(); // it might not yet be synched | |
729 } | |
730 MethodLivenessResult live_locals = method->liveness_at_bci(bci); | |
731 int len = (int)live_locals.size(); | |
732 if (!live_locals.is_valid() || len == 0) | |
733 // This method is trivial, or is poisoned by a breakpoint. | |
734 return true; | |
735 assert(len == jvms->loc_size(), "live map consistent with locals map"); | |
736 for (int local = 0; local < len; local++) { | |
737 if (!live_locals.at(local) && map->local(jvms, local) != top()) { | |
738 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
739 tty->print_cr("Zombie local %d: ", local); | |
740 jvms->dump(); | |
741 } | |
742 return false; | |
743 } | |
744 } | |
745 } | |
746 return true; | |
747 } | |
748 | |
749 #endif //ASSERT | |
750 | |
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751 // Helper function for enforcing certain bytecodes to reexecute if |
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752 // deoptimization happens |
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753 static bool should_reexecute_implied_by_bytecode(JVMState *jvms) { |
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754 ciMethod* cur_method = jvms->method(); |
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755 int cur_bci = jvms->bci(); |
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756 if (cur_method != NULL && cur_bci != InvocationEntryBci) { |
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757 Bytecodes::Code code = cur_method->java_code_at_bci(cur_bci); |
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758 return Interpreter::bytecode_should_reexecute(code); |
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759 } else |
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760 return false; |
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761 } |
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762 |
0 | 763 // Helper function for adding JVMState and debug information to node |
764 void GraphKit::add_safepoint_edges(SafePointNode* call, bool must_throw) { | |
765 // Add the safepoint edges to the call (or other safepoint). | |
766 | |
767 // Make sure dead locals are set to top. This | |
768 // should help register allocation time and cut down on the size | |
769 // of the deoptimization information. | |
770 assert(dead_locals_are_killed(), "garbage in debug info before safepoint"); | |
771 | |
772 // Walk the inline list to fill in the correct set of JVMState's | |
773 // Also fill in the associated edges for each JVMState. | |
774 | |
775 JVMState* youngest_jvms = sync_jvms(); | |
776 | |
777 // Do we need debug info here? If it is a SafePoint and this method | |
778 // cannot de-opt, then we do NOT need any debug info. | |
779 bool full_info = (C->deopt_happens() || call->Opcode() != Op_SafePoint); | |
780 | |
781 // If we are guaranteed to throw, we can prune everything but the | |
782 // input to the current bytecode. | |
783 bool can_prune_locals = false; | |
784 uint stack_slots_not_pruned = 0; | |
785 int inputs = 0, depth = 0; | |
786 if (must_throw) { | |
787 assert(method() == youngest_jvms->method(), "sanity"); | |
788 if (compute_stack_effects(inputs, depth)) { | |
789 can_prune_locals = true; | |
790 stack_slots_not_pruned = inputs; | |
791 } | |
792 } | |
793 | |
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794 if (env()->jvmti_can_examine_or_deopt_anywhere()) { |
0 | 795 // At any safepoint, this method can get breakpointed, which would |
796 // then require an immediate deoptimization. | |
797 full_info = true; | |
798 can_prune_locals = false; // do not prune locals | |
799 stack_slots_not_pruned = 0; | |
800 } | |
801 | |
802 // do not scribble on the input jvms | |
803 JVMState* out_jvms = youngest_jvms->clone_deep(C); | |
804 call->set_jvms(out_jvms); // Start jvms list for call node | |
805 | |
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806 // For a known set of bytecodes, the interpreter should reexecute them if |
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807 // deoptimization happens. We set the reexecute state for them here |
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808 if (out_jvms->is_reexecute_undefined() && //don't change if already specified |
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809 should_reexecute_implied_by_bytecode(out_jvms)) { |
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810 out_jvms->set_should_reexecute(true); //NOTE: youngest_jvms not changed |
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811 } |
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812 |
0 | 813 // Presize the call: |
814 debug_only(uint non_debug_edges = call->req()); | |
815 call->add_req_batch(top(), youngest_jvms->debug_depth()); | |
816 assert(call->req() == non_debug_edges + youngest_jvms->debug_depth(), ""); | |
817 | |
818 // Set up edges so that the call looks like this: | |
819 // Call [state:] ctl io mem fptr retadr | |
820 // [parms:] parm0 ... parmN | |
821 // [root:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN | |
822 // [...mid:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN [...] | |
823 // [young:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN | |
824 // Note that caller debug info precedes callee debug info. | |
825 | |
826 // Fill pointer walks backwards from "young:" to "root:" in the diagram above: | |
827 uint debug_ptr = call->req(); | |
828 | |
829 // Loop over the map input edges associated with jvms, add them | |
830 // to the call node, & reset all offsets to match call node array. | |
831 for (JVMState* in_jvms = youngest_jvms; in_jvms != NULL; ) { | |
832 uint debug_end = debug_ptr; | |
833 uint debug_start = debug_ptr - in_jvms->debug_size(); | |
834 debug_ptr = debug_start; // back up the ptr | |
835 | |
836 uint p = debug_start; // walks forward in [debug_start, debug_end) | |
837 uint j, k, l; | |
838 SafePointNode* in_map = in_jvms->map(); | |
839 out_jvms->set_map(call); | |
840 | |
841 if (can_prune_locals) { | |
842 assert(in_jvms->method() == out_jvms->method(), "sanity"); | |
843 // If the current throw can reach an exception handler in this JVMS, | |
844 // then we must keep everything live that can reach that handler. | |
845 // As a quick and dirty approximation, we look for any handlers at all. | |
846 if (in_jvms->method()->has_exception_handlers()) { | |
847 can_prune_locals = false; | |
848 } | |
849 } | |
850 | |
851 // Add the Locals | |
852 k = in_jvms->locoff(); | |
853 l = in_jvms->loc_size(); | |
854 out_jvms->set_locoff(p); | |
855 if (full_info && !can_prune_locals) { | |
856 for (j = 0; j < l; j++) | |
857 call->set_req(p++, in_map->in(k+j)); | |
858 } else { | |
859 p += l; // already set to top above by add_req_batch | |
860 } | |
861 | |
862 // Add the Expression Stack | |
863 k = in_jvms->stkoff(); | |
864 l = in_jvms->sp(); | |
865 out_jvms->set_stkoff(p); | |
866 if (full_info && !can_prune_locals) { | |
867 for (j = 0; j < l; j++) | |
868 call->set_req(p++, in_map->in(k+j)); | |
869 } else if (can_prune_locals && stack_slots_not_pruned != 0) { | |
870 // Divide stack into {S0,...,S1}, where S0 is set to top. | |
871 uint s1 = stack_slots_not_pruned; | |
872 stack_slots_not_pruned = 0; // for next iteration | |
873 if (s1 > l) s1 = l; | |
874 uint s0 = l - s1; | |
875 p += s0; // skip the tops preinstalled by add_req_batch | |
876 for (j = s0; j < l; j++) | |
877 call->set_req(p++, in_map->in(k+j)); | |
878 } else { | |
879 p += l; // already set to top above by add_req_batch | |
880 } | |
881 | |
882 // Add the Monitors | |
883 k = in_jvms->monoff(); | |
884 l = in_jvms->mon_size(); | |
885 out_jvms->set_monoff(p); | |
886 for (j = 0; j < l; j++) | |
887 call->set_req(p++, in_map->in(k+j)); | |
888 | |
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889 // Copy any scalar object fields. |
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890 k = in_jvms->scloff(); |
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891 l = in_jvms->scl_size(); |
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892 out_jvms->set_scloff(p); |
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893 for (j = 0; j < l; j++) |
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894 call->set_req(p++, in_map->in(k+j)); |
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895 |
0 | 896 // Finish the new jvms. |
897 out_jvms->set_endoff(p); | |
898 | |
899 assert(out_jvms->endoff() == debug_end, "fill ptr must match"); | |
900 assert(out_jvms->depth() == in_jvms->depth(), "depth must match"); | |
901 assert(out_jvms->loc_size() == in_jvms->loc_size(), "size must match"); | |
902 assert(out_jvms->mon_size() == in_jvms->mon_size(), "size must match"); | |
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903 assert(out_jvms->scl_size() == in_jvms->scl_size(), "size must match"); |
0 | 904 assert(out_jvms->debug_size() == in_jvms->debug_size(), "size must match"); |
905 | |
906 // Update the two tail pointers in parallel. | |
907 out_jvms = out_jvms->caller(); | |
908 in_jvms = in_jvms->caller(); | |
909 } | |
910 | |
911 assert(debug_ptr == non_debug_edges, "debug info must fit exactly"); | |
912 | |
913 // Test the correctness of JVMState::debug_xxx accessors: | |
914 assert(call->jvms()->debug_start() == non_debug_edges, ""); | |
915 assert(call->jvms()->debug_end() == call->req(), ""); | |
916 assert(call->jvms()->debug_depth() == call->req() - non_debug_edges, ""); | |
917 } | |
918 | |
919 bool GraphKit::compute_stack_effects(int& inputs, int& depth) { | |
920 Bytecodes::Code code = java_bc(); | |
921 if (code == Bytecodes::_wide) { | |
922 code = method()->java_code_at_bci(bci() + 1); | |
923 } | |
924 | |
925 BasicType rtype = T_ILLEGAL; | |
926 int rsize = 0; | |
927 | |
928 if (code != Bytecodes::_illegal) { | |
929 depth = Bytecodes::depth(code); // checkcast=0, athrow=-1 | |
930 rtype = Bytecodes::result_type(code); // checkcast=P, athrow=V | |
931 if (rtype < T_CONFLICT) | |
932 rsize = type2size[rtype]; | |
933 } | |
934 | |
935 switch (code) { | |
936 case Bytecodes::_illegal: | |
937 return false; | |
938 | |
939 case Bytecodes::_ldc: | |
940 case Bytecodes::_ldc_w: | |
941 case Bytecodes::_ldc2_w: | |
942 inputs = 0; | |
943 break; | |
944 | |
945 case Bytecodes::_dup: inputs = 1; break; | |
946 case Bytecodes::_dup_x1: inputs = 2; break; | |
947 case Bytecodes::_dup_x2: inputs = 3; break; | |
948 case Bytecodes::_dup2: inputs = 2; break; | |
949 case Bytecodes::_dup2_x1: inputs = 3; break; | |
950 case Bytecodes::_dup2_x2: inputs = 4; break; | |
951 case Bytecodes::_swap: inputs = 2; break; | |
952 case Bytecodes::_arraylength: inputs = 1; break; | |
953 | |
954 case Bytecodes::_getstatic: | |
955 case Bytecodes::_putstatic: | |
956 case Bytecodes::_getfield: | |
957 case Bytecodes::_putfield: | |
958 { | |
959 bool is_get = (depth >= 0), is_static = (depth & 1); | |
960 bool ignore; | |
961 ciBytecodeStream iter(method()); | |
962 iter.reset_to_bci(bci()); | |
963 iter.next(); | |
964 ciField* field = iter.get_field(ignore); | |
965 int size = field->type()->size(); | |
966 inputs = (is_static ? 0 : 1); | |
967 if (is_get) { | |
968 depth = size - inputs; | |
969 } else { | |
970 inputs += size; // putxxx pops the value from the stack | |
971 depth = - inputs; | |
972 } | |
973 } | |
974 break; | |
975 | |
976 case Bytecodes::_invokevirtual: | |
977 case Bytecodes::_invokespecial: | |
978 case Bytecodes::_invokestatic: | |
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979 case Bytecodes::_invokedynamic: |
0 | 980 case Bytecodes::_invokeinterface: |
981 { | |
982 bool is_static = (depth == 0); | |
983 bool ignore; | |
984 ciBytecodeStream iter(method()); | |
985 iter.reset_to_bci(bci()); | |
986 iter.next(); | |
987 ciMethod* method = iter.get_method(ignore); | |
988 inputs = method->arg_size_no_receiver(); | |
989 if (!is_static) inputs += 1; | |
990 int size = method->return_type()->size(); | |
991 depth = size - inputs; | |
992 } | |
993 break; | |
994 | |
995 case Bytecodes::_multianewarray: | |
996 { | |
997 ciBytecodeStream iter(method()); | |
998 iter.reset_to_bci(bci()); | |
999 iter.next(); | |
1000 inputs = iter.get_dimensions(); | |
1001 assert(rsize == 1, ""); | |
1002 depth = rsize - inputs; | |
1003 } | |
1004 break; | |
1005 | |
1006 case Bytecodes::_ireturn: | |
1007 case Bytecodes::_lreturn: | |
1008 case Bytecodes::_freturn: | |
1009 case Bytecodes::_dreturn: | |
1010 case Bytecodes::_areturn: | |
1011 assert(rsize = -depth, ""); | |
1012 inputs = rsize; | |
1013 break; | |
1014 | |
1015 case Bytecodes::_jsr: | |
1016 case Bytecodes::_jsr_w: | |
1017 inputs = 0; | |
1018 depth = 1; // S.B. depth=1, not zero | |
1019 break; | |
1020 | |
1021 default: | |
1022 // bytecode produces a typed result | |
1023 inputs = rsize - depth; | |
1024 assert(inputs >= 0, ""); | |
1025 break; | |
1026 } | |
1027 | |
1028 #ifdef ASSERT | |
1029 // spot check | |
1030 int outputs = depth + inputs; | |
1031 assert(outputs >= 0, "sanity"); | |
1032 switch (code) { | |
1033 case Bytecodes::_checkcast: assert(inputs == 1 && outputs == 1, ""); break; | |
1034 case Bytecodes::_athrow: assert(inputs == 1 && outputs == 0, ""); break; | |
1035 case Bytecodes::_aload_0: assert(inputs == 0 && outputs == 1, ""); break; | |
1036 case Bytecodes::_return: assert(inputs == 0 && outputs == 0, ""); break; | |
1037 case Bytecodes::_drem: assert(inputs == 4 && outputs == 2, ""); break; | |
1038 } | |
1039 #endif //ASSERT | |
1040 | |
1041 return true; | |
1042 } | |
1043 | |
1044 | |
1045 | |
1046 //------------------------------basic_plus_adr--------------------------------- | |
1047 Node* GraphKit::basic_plus_adr(Node* base, Node* ptr, Node* offset) { | |
1048 // short-circuit a common case | |
1049 if (offset == intcon(0)) return ptr; | |
1050 return _gvn.transform( new (C, 4) AddPNode(base, ptr, offset) ); | |
1051 } | |
1052 | |
1053 Node* GraphKit::ConvI2L(Node* offset) { | |
1054 // short-circuit a common case | |
1055 jint offset_con = find_int_con(offset, Type::OffsetBot); | |
1056 if (offset_con != Type::OffsetBot) { | |
1057 return longcon((long) offset_con); | |
1058 } | |
1059 return _gvn.transform( new (C, 2) ConvI2LNode(offset)); | |
1060 } | |
1061 Node* GraphKit::ConvL2I(Node* offset) { | |
1062 // short-circuit a common case | |
1063 jlong offset_con = find_long_con(offset, (jlong)Type::OffsetBot); | |
1064 if (offset_con != (jlong)Type::OffsetBot) { | |
1065 return intcon((int) offset_con); | |
1066 } | |
1067 return _gvn.transform( new (C, 2) ConvL2INode(offset)); | |
1068 } | |
1069 | |
1070 //-------------------------load_object_klass----------------------------------- | |
1071 Node* GraphKit::load_object_klass(Node* obj) { | |
1072 // Special-case a fresh allocation to avoid building nodes: | |
1073 Node* akls = AllocateNode::Ideal_klass(obj, &_gvn); | |
1074 if (akls != NULL) return akls; | |
1075 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes()); | |
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1076 return _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), k_adr, TypeInstPtr::KLASS) ); |
0 | 1077 } |
1078 | |
1079 //-------------------------load_array_length----------------------------------- | |
1080 Node* GraphKit::load_array_length(Node* array) { | |
1081 // Special-case a fresh allocation to avoid building nodes: | |
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1082 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(array, &_gvn); |
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1083 Node *alen; |
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1084 if (alloc == NULL) { |
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1085 Node *r_adr = basic_plus_adr(array, arrayOopDesc::length_offset_in_bytes()); |
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1086 alen = _gvn.transform( new (C, 3) LoadRangeNode(0, immutable_memory(), r_adr, TypeInt::POS)); |
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1087 } else { |
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1088 alen = alloc->Ideal_length(); |
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1089 Node* ccast = alloc->make_ideal_length(_gvn.type(array)->is_aryptr(), &_gvn); |
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1090 if (ccast != alen) { |
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1091 alen = _gvn.transform(ccast); |
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1092 } |
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1093 } |
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1094 return alen; |
0 | 1095 } |
1096 | |
1097 //------------------------------do_null_check---------------------------------- | |
1098 // Helper function to do a NULL pointer check. Returned value is | |
1099 // the incoming address with NULL casted away. You are allowed to use the | |
1100 // not-null value only if you are control dependent on the test. | |
1101 extern int explicit_null_checks_inserted, | |
1102 explicit_null_checks_elided; | |
1103 Node* GraphKit::null_check_common(Node* value, BasicType type, | |
1104 // optional arguments for variations: | |
1105 bool assert_null, | |
1106 Node* *null_control) { | |
1107 assert(!assert_null || null_control == NULL, "not both at once"); | |
1108 if (stopped()) return top(); | |
1109 if (!GenerateCompilerNullChecks && !assert_null && null_control == NULL) { | |
1110 // For some performance testing, we may wish to suppress null checking. | |
1111 value = cast_not_null(value); // Make it appear to be non-null (4962416). | |
1112 return value; | |
1113 } | |
1114 explicit_null_checks_inserted++; | |
1115 | |
1116 // Construct NULL check | |
1117 Node *chk = NULL; | |
1118 switch(type) { | |
1119 case T_LONG : chk = new (C, 3) CmpLNode(value, _gvn.zerocon(T_LONG)); break; | |
1120 case T_INT : chk = new (C, 3) CmpINode( value, _gvn.intcon(0)); break; | |
1121 case T_ARRAY : // fall through | |
1122 type = T_OBJECT; // simplify further tests | |
1123 case T_OBJECT : { | |
1124 const Type *t = _gvn.type( value ); | |
1125 | |
1126 const TypeInstPtr* tp = t->isa_instptr(); | |
1127 if (tp != NULL && !tp->klass()->is_loaded() | |
1128 // Only for do_null_check, not any of its siblings: | |
1129 && !assert_null && null_control == NULL) { | |
1130 // Usually, any field access or invocation on an unloaded oop type | |
1131 // will simply fail to link, since the statically linked class is | |
1132 // likely also to be unloaded. However, in -Xcomp mode, sometimes | |
1133 // the static class is loaded but the sharper oop type is not. | |
1134 // Rather than checking for this obscure case in lots of places, | |
1135 // we simply observe that a null check on an unloaded class | |
1136 // will always be followed by a nonsense operation, so we | |
1137 // can just issue the uncommon trap here. | |
1138 // Our access to the unloaded class will only be correct | |
1139 // after it has been loaded and initialized, which requires | |
1140 // a trip through the interpreter. | |
1141 #ifndef PRODUCT | |
1142 if (WizardMode) { tty->print("Null check of unloaded "); tp->klass()->print(); tty->cr(); } | |
1143 #endif | |
1144 uncommon_trap(Deoptimization::Reason_unloaded, | |
1145 Deoptimization::Action_reinterpret, | |
1146 tp->klass(), "!loaded"); | |
1147 return top(); | |
1148 } | |
1149 | |
1150 if (assert_null) { | |
1151 // See if the type is contained in NULL_PTR. | |
1152 // If so, then the value is already null. | |
1153 if (t->higher_equal(TypePtr::NULL_PTR)) { | |
1154 explicit_null_checks_elided++; | |
1155 return value; // Elided null assert quickly! | |
1156 } | |
1157 } else { | |
1158 // See if mixing in the NULL pointer changes type. | |
1159 // If so, then the NULL pointer was not allowed in the original | |
1160 // type. In other words, "value" was not-null. | |
1161 if (t->meet(TypePtr::NULL_PTR) != t) { | |
1162 // same as: if (!TypePtr::NULL_PTR->higher_equal(t)) ... | |
1163 explicit_null_checks_elided++; | |
1164 return value; // Elided null check quickly! | |
1165 } | |
1166 } | |
1167 chk = new (C, 3) CmpPNode( value, null() ); | |
1168 break; | |
1169 } | |
1170 | |
1171 default : ShouldNotReachHere(); | |
1172 } | |
1173 assert(chk != NULL, "sanity check"); | |
1174 chk = _gvn.transform(chk); | |
1175 | |
1176 BoolTest::mask btest = assert_null ? BoolTest::eq : BoolTest::ne; | |
1177 BoolNode *btst = new (C, 2) BoolNode( chk, btest); | |
1178 Node *tst = _gvn.transform( btst ); | |
1179 | |
1180 //----------- | |
605 | 1181 // if peephole optimizations occurred, a prior test existed. |
0 | 1182 // If a prior test existed, maybe it dominates as we can avoid this test. |
1183 if (tst != btst && type == T_OBJECT) { | |
1184 // At this point we want to scan up the CFG to see if we can | |
1185 // find an identical test (and so avoid this test altogether). | |
1186 Node *cfg = control(); | |
1187 int depth = 0; | |
1188 while( depth < 16 ) { // Limit search depth for speed | |
1189 if( cfg->Opcode() == Op_IfTrue && | |
1190 cfg->in(0)->in(1) == tst ) { | |
1191 // Found prior test. Use "cast_not_null" to construct an identical | |
1192 // CastPP (and hence hash to) as already exists for the prior test. | |
1193 // Return that casted value. | |
1194 if (assert_null) { | |
1195 replace_in_map(value, null()); | |
1196 return null(); // do not issue the redundant test | |
1197 } | |
1198 Node *oldcontrol = control(); | |
1199 set_control(cfg); | |
1200 Node *res = cast_not_null(value); | |
1201 set_control(oldcontrol); | |
1202 explicit_null_checks_elided++; | |
1203 return res; | |
1204 } | |
1205 cfg = IfNode::up_one_dom(cfg, /*linear_only=*/ true); | |
1206 if (cfg == NULL) break; // Quit at region nodes | |
1207 depth++; | |
1208 } | |
1209 } | |
1210 | |
1211 //----------- | |
1212 // Branch to failure if null | |
1213 float ok_prob = PROB_MAX; // a priori estimate: nulls never happen | |
1214 Deoptimization::DeoptReason reason; | |
1215 if (assert_null) | |
1216 reason = Deoptimization::Reason_null_assert; | |
1217 else if (type == T_OBJECT) | |
1218 reason = Deoptimization::Reason_null_check; | |
1219 else | |
1220 reason = Deoptimization::Reason_div0_check; | |
1221 | |
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1222 // %%% Since Reason_unhandled is not recorded on a per-bytecode basis, |
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1223 // ciMethodData::has_trap_at will return a conservative -1 if any |
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1224 // must-be-null assertion has failed. This could cause performance |
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1225 // problems for a method after its first do_null_assert failure. |
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1226 // Consider using 'Reason_class_check' instead? |
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1227 |
0 | 1228 // To cause an implicit null check, we set the not-null probability |
605 | 1229 // to the maximum (PROB_MAX). For an explicit check the probability |
0 | 1230 // is set to a smaller value. |
1231 if (null_control != NULL || too_many_traps(reason)) { | |
1232 // probability is less likely | |
1233 ok_prob = PROB_LIKELY_MAG(3); | |
1234 } else if (!assert_null && | |
1235 (ImplicitNullCheckThreshold > 0) && | |
1236 method() != NULL && | |
1237 (method()->method_data()->trap_count(reason) | |
1238 >= (uint)ImplicitNullCheckThreshold)) { | |
1239 ok_prob = PROB_LIKELY_MAG(3); | |
1240 } | |
1241 | |
1242 if (null_control != NULL) { | |
1243 IfNode* iff = create_and_map_if(control(), tst, ok_prob, COUNT_UNKNOWN); | |
1244 Node* null_true = _gvn.transform( new (C, 1) IfFalseNode(iff)); | |
1245 set_control( _gvn.transform( new (C, 1) IfTrueNode(iff))); | |
1246 if (null_true == top()) | |
1247 explicit_null_checks_elided++; | |
1248 (*null_control) = null_true; | |
1249 } else { | |
1250 BuildCutout unless(this, tst, ok_prob); | |
1251 // Check for optimizer eliding test at parse time | |
1252 if (stopped()) { | |
1253 // Failure not possible; do not bother making uncommon trap. | |
1254 explicit_null_checks_elided++; | |
1255 } else if (assert_null) { | |
1256 uncommon_trap(reason, | |
1257 Deoptimization::Action_make_not_entrant, | |
1258 NULL, "assert_null"); | |
1259 } else { | |
332 | 1260 replace_in_map(value, zerocon(type)); |
0 | 1261 builtin_throw(reason); |
1262 } | |
1263 } | |
1264 | |
1265 // Must throw exception, fall-thru not possible? | |
1266 if (stopped()) { | |
1267 return top(); // No result | |
1268 } | |
1269 | |
1270 if (assert_null) { | |
1271 // Cast obj to null on this path. | |
1272 replace_in_map(value, zerocon(type)); | |
1273 return zerocon(type); | |
1274 } | |
1275 | |
1276 // Cast obj to not-null on this path, if there is no null_control. | |
1277 // (If there is a null_control, a non-null value may come back to haunt us.) | |
1278 if (type == T_OBJECT) { | |
1279 Node* cast = cast_not_null(value, false); | |
1280 if (null_control == NULL || (*null_control) == top()) | |
1281 replace_in_map(value, cast); | |
1282 value = cast; | |
1283 } | |
1284 | |
1285 return value; | |
1286 } | |
1287 | |
1288 | |
1289 //------------------------------cast_not_null---------------------------------- | |
1290 // Cast obj to not-null on this path | |
1291 Node* GraphKit::cast_not_null(Node* obj, bool do_replace_in_map) { | |
1292 const Type *t = _gvn.type(obj); | |
1293 const Type *t_not_null = t->join(TypePtr::NOTNULL); | |
1294 // Object is already not-null? | |
1295 if( t == t_not_null ) return obj; | |
1296 | |
1297 Node *cast = new (C, 2) CastPPNode(obj,t_not_null); | |
1298 cast->init_req(0, control()); | |
1299 cast = _gvn.transform( cast ); | |
1300 | |
1301 // Scan for instances of 'obj' in the current JVM mapping. | |
1302 // These instances are known to be not-null after the test. | |
1303 if (do_replace_in_map) | |
1304 replace_in_map(obj, cast); | |
1305 | |
1306 return cast; // Return casted value | |
1307 } | |
1308 | |
1309 | |
1310 //--------------------------replace_in_map------------------------------------- | |
1311 void GraphKit::replace_in_map(Node* old, Node* neww) { | |
1312 this->map()->replace_edge(old, neww); | |
1313 | |
1314 // Note: This operation potentially replaces any edge | |
1315 // on the map. This includes locals, stack, and monitors | |
1316 // of the current (innermost) JVM state. | |
1317 | |
1318 // We can consider replacing in caller maps. | |
1319 // The idea would be that an inlined function's null checks | |
1320 // can be shared with the entire inlining tree. | |
1321 // The expense of doing this is that the PreserveJVMState class | |
1322 // would have to preserve caller states too, with a deep copy. | |
1323 } | |
1324 | |
1325 | |
1326 | |
1327 //============================================================================= | |
1328 //--------------------------------memory--------------------------------------- | |
1329 Node* GraphKit::memory(uint alias_idx) { | |
1330 MergeMemNode* mem = merged_memory(); | |
1331 Node* p = mem->memory_at(alias_idx); | |
1332 _gvn.set_type(p, Type::MEMORY); // must be mapped | |
1333 return p; | |
1334 } | |
1335 | |
1336 //-----------------------------reset_memory------------------------------------ | |
1337 Node* GraphKit::reset_memory() { | |
1338 Node* mem = map()->memory(); | |
1339 // do not use this node for any more parsing! | |
1340 debug_only( map()->set_memory((Node*)NULL) ); | |
1341 return _gvn.transform( mem ); | |
1342 } | |
1343 | |
1344 //------------------------------set_all_memory--------------------------------- | |
1345 void GraphKit::set_all_memory(Node* newmem) { | |
1346 Node* mergemem = MergeMemNode::make(C, newmem); | |
1347 gvn().set_type_bottom(mergemem); | |
1348 map()->set_memory(mergemem); | |
1349 } | |
1350 | |
1351 //------------------------------set_all_memory_call---------------------------- | |
1352 void GraphKit::set_all_memory_call(Node* call) { | |
1353 Node* newmem = _gvn.transform( new (C, 1) ProjNode(call, TypeFunc::Memory) ); | |
1354 set_all_memory(newmem); | |
1355 } | |
1356 | |
1357 //============================================================================= | |
1358 // | |
1359 // parser factory methods for MemNodes | |
1360 // | |
1361 // These are layered on top of the factory methods in LoadNode and StoreNode, | |
1362 // and integrate with the parser's memory state and _gvn engine. | |
1363 // | |
1364 | |
1365 // factory methods in "int adr_idx" | |
1366 Node* GraphKit::make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, | |
1367 int adr_idx, | |
1368 bool require_atomic_access) { | |
1369 assert(adr_idx != Compile::AliasIdxTop, "use other make_load factory" ); | |
1370 const TypePtr* adr_type = NULL; // debug-mode-only argument | |
1371 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
1372 Node* mem = memory(adr_idx); | |
1373 Node* ld; | |
1374 if (require_atomic_access && bt == T_LONG) { | |
1375 ld = LoadLNode::make_atomic(C, ctl, mem, adr, adr_type, t); | |
1376 } else { | |
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1377 ld = LoadNode::make(_gvn, ctl, mem, adr, adr_type, t, bt); |
0 | 1378 } |
1379 return _gvn.transform(ld); | |
1380 } | |
1381 | |
1382 Node* GraphKit::store_to_memory(Node* ctl, Node* adr, Node *val, BasicType bt, | |
1383 int adr_idx, | |
1384 bool require_atomic_access) { | |
1385 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); | |
1386 const TypePtr* adr_type = NULL; | |
1387 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
1388 Node *mem = memory(adr_idx); | |
1389 Node* st; | |
1390 if (require_atomic_access && bt == T_LONG) { | |
1391 st = StoreLNode::make_atomic(C, ctl, mem, adr, adr_type, val); | |
1392 } else { | |
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1393 st = StoreNode::make(_gvn, ctl, mem, adr, adr_type, val, bt); |
0 | 1394 } |
1395 st = _gvn.transform(st); | |
1396 set_memory(st, adr_idx); | |
1397 // Back-to-back stores can only remove intermediate store with DU info | |
1398 // so push on worklist for optimizer. | |
1399 if (mem->req() > MemNode::Address && adr == mem->in(MemNode::Address)) | |
1400 record_for_igvn(st); | |
1401 | |
1402 return st; | |
1403 } | |
1404 | |
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1405 |
0 | 1406 void GraphKit::pre_barrier(Node* ctl, |
1407 Node* obj, | |
1408 Node* adr, | |
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1409 uint adr_idx, |
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1410 Node* val, |
825 | 1411 const TypeOopPtr* val_type, |
0 | 1412 BasicType bt) { |
1413 BarrierSet* bs = Universe::heap()->barrier_set(); | |
1414 set_control(ctl); | |
1415 switch (bs->kind()) { | |
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1416 case BarrierSet::G1SATBCT: |
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1417 case BarrierSet::G1SATBCTLogging: |
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1418 g1_write_barrier_pre(obj, adr, adr_idx, val, val_type, bt); |
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1419 break; |
0 | 1420 |
1421 case BarrierSet::CardTableModRef: | |
1422 case BarrierSet::CardTableExtension: | |
1423 case BarrierSet::ModRef: | |
1424 break; | |
1425 | |
1426 case BarrierSet::Other: | |
1427 default : | |
1428 ShouldNotReachHere(); | |
1429 | |
1430 } | |
1431 } | |
1432 | |
1433 void GraphKit::post_barrier(Node* ctl, | |
1434 Node* store, | |
1435 Node* obj, | |
1436 Node* adr, | |
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1437 uint adr_idx, |
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1438 Node* val, |
0 | 1439 BasicType bt, |
1440 bool use_precise) { | |
1441 BarrierSet* bs = Universe::heap()->barrier_set(); | |
1442 set_control(ctl); | |
1443 switch (bs->kind()) { | |
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1444 case BarrierSet::G1SATBCT: |
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1445 case BarrierSet::G1SATBCTLogging: |
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1446 g1_write_barrier_post(store, obj, adr, adr_idx, val, bt, use_precise); |
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1447 break; |
0 | 1448 |
1449 case BarrierSet::CardTableModRef: | |
1450 case BarrierSet::CardTableExtension: | |
1451 write_barrier_post(store, obj, adr, val, use_precise); | |
1452 break; | |
1453 | |
1454 case BarrierSet::ModRef: | |
1455 break; | |
1456 | |
1457 case BarrierSet::Other: | |
1458 default : | |
1459 ShouldNotReachHere(); | |
1460 | |
1461 } | |
1462 } | |
1463 | |
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1464 Node* GraphKit::store_oop(Node* ctl, |
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1465 Node* obj, |
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1466 Node* adr, |
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1467 const TypePtr* adr_type, |
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1468 Node* val, |
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1469 const TypeOopPtr* val_type, |
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1470 BasicType bt, |
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1471 bool use_precise) { |
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1472 |
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1473 set_control(ctl); |
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1474 if (stopped()) return top(); // Dead path ? |
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1475 |
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1476 assert(bt == T_OBJECT, "sanity"); |
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1477 assert(val != NULL, "not dead path"); |
0 | 1478 uint adr_idx = C->get_alias_index(adr_type); |
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1479 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); |
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1480 |
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1481 pre_barrier(control(), obj, adr, adr_idx, val, val_type, bt); |
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1482 Node* store = store_to_memory(control(), adr, val, bt, adr_idx); |
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1483 post_barrier(control(), store, obj, adr, adr_idx, val, bt, use_precise); |
0 | 1484 return store; |
1485 } | |
1486 | |
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1487 // Could be an array or object we don't know at compile time (unsafe ref.) |
0 | 1488 Node* GraphKit::store_oop_to_unknown(Node* ctl, |
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1489 Node* obj, // containing obj |
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1490 Node* adr, // actual adress to store val at |
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1491 const TypePtr* adr_type, |
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1492 Node* val, |
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1493 BasicType bt) { |
825 | 1494 Compile::AliasType* at = C->alias_type(adr_type); |
1495 const TypeOopPtr* val_type = NULL; | |
1496 if (adr_type->isa_instptr()) { | |
1497 if (at->field() != NULL) { | |
1498 // known field. This code is a copy of the do_put_xxx logic. | |
1499 ciField* field = at->field(); | |
1500 if (!field->type()->is_loaded()) { | |
1501 val_type = TypeInstPtr::BOTTOM; | |
1502 } else { | |
1503 val_type = TypeOopPtr::make_from_klass(field->type()->as_klass()); | |
1504 } | |
1505 } | |
1506 } else if (adr_type->isa_aryptr()) { | |
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1507 val_type = adr_type->is_aryptr()->elem()->make_oopptr(); |
825 | 1508 } |
1509 if (val_type == NULL) { | |
1510 val_type = TypeInstPtr::BOTTOM; | |
1511 } | |
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1512 return store_oop(ctl, obj, adr, adr_type, val, val_type, bt, true); |
0 | 1513 } |
1514 | |
1515 | |
1516 //-------------------------array_element_address------------------------- | |
1517 Node* GraphKit::array_element_address(Node* ary, Node* idx, BasicType elembt, | |
1518 const TypeInt* sizetype) { | |
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1519 uint shift = exact_log2(type2aelembytes(elembt)); |
0 | 1520 uint header = arrayOopDesc::base_offset_in_bytes(elembt); |
1521 | |
1522 // short-circuit a common case (saves lots of confusing waste motion) | |
1523 jint idx_con = find_int_con(idx, -1); | |
1524 if (idx_con >= 0) { | |
1525 intptr_t offset = header + ((intptr_t)idx_con << shift); | |
1526 return basic_plus_adr(ary, offset); | |
1527 } | |
1528 | |
1529 // must be correct type for alignment purposes | |
1530 Node* base = basic_plus_adr(ary, header); | |
1531 #ifdef _LP64 | |
1532 // The scaled index operand to AddP must be a clean 64-bit value. | |
1533 // Java allows a 32-bit int to be incremented to a negative | |
1534 // value, which appears in a 64-bit register as a large | |
1535 // positive number. Using that large positive number as an | |
1536 // operand in pointer arithmetic has bad consequences. | |
1537 // On the other hand, 32-bit overflow is rare, and the possibility | |
1538 // can often be excluded, if we annotate the ConvI2L node with | |
1539 // a type assertion that its value is known to be a small positive | |
1540 // number. (The prior range check has ensured this.) | |
1541 // This assertion is used by ConvI2LNode::Ideal. | |
1542 int index_max = max_jint - 1; // array size is max_jint, index is one less | |
1543 if (sizetype != NULL) index_max = sizetype->_hi - 1; | |
1544 const TypeLong* lidxtype = TypeLong::make(CONST64(0), index_max, Type::WidenMax); | |
1545 idx = _gvn.transform( new (C, 2) ConvI2LNode(idx, lidxtype) ); | |
1546 #endif | |
1547 Node* scale = _gvn.transform( new (C, 3) LShiftXNode(idx, intcon(shift)) ); | |
1548 return basic_plus_adr(ary, base, scale); | |
1549 } | |
1550 | |
1551 //-------------------------load_array_element------------------------- | |
1552 Node* GraphKit::load_array_element(Node* ctl, Node* ary, Node* idx, const TypeAryPtr* arytype) { | |
1553 const Type* elemtype = arytype->elem(); | |
1554 BasicType elembt = elemtype->array_element_basic_type(); | |
1555 Node* adr = array_element_address(ary, idx, elembt, arytype->size()); | |
1556 Node* ld = make_load(ctl, adr, elemtype, elembt, arytype); | |
1557 return ld; | |
1558 } | |
1559 | |
1560 //-------------------------set_arguments_for_java_call------------------------- | |
1561 // Arguments (pre-popped from the stack) are taken from the JVMS. | |
1562 void GraphKit::set_arguments_for_java_call(CallJavaNode* call) { | |
1563 // Add the call arguments: | |
1564 uint nargs = call->method()->arg_size(); | |
1565 for (uint i = 0; i < nargs; i++) { | |
1566 Node* arg = argument(i); | |
1567 call->init_req(i + TypeFunc::Parms, arg); | |
1568 } | |
1569 } | |
1570 | |
1571 //---------------------------set_edges_for_java_call--------------------------- | |
1572 // Connect a newly created call into the current JVMS. | |
1573 // A return value node (if any) is returned from set_edges_for_java_call. | |
1574 void GraphKit::set_edges_for_java_call(CallJavaNode* call, bool must_throw) { | |
1575 | |
1576 // Add the predefined inputs: | |
1577 call->init_req( TypeFunc::Control, control() ); | |
1578 call->init_req( TypeFunc::I_O , i_o() ); | |
1579 call->init_req( TypeFunc::Memory , reset_memory() ); | |
1580 call->init_req( TypeFunc::FramePtr, frameptr() ); | |
1581 call->init_req( TypeFunc::ReturnAdr, top() ); | |
1582 | |
1583 add_safepoint_edges(call, must_throw); | |
1584 | |
1585 Node* xcall = _gvn.transform(call); | |
1586 | |
1587 if (xcall == top()) { | |
1588 set_control(top()); | |
1589 return; | |
1590 } | |
1591 assert(xcall == call, "call identity is stable"); | |
1592 | |
1593 // Re-use the current map to produce the result. | |
1594 | |
1595 set_control(_gvn.transform(new (C, 1) ProjNode(call, TypeFunc::Control))); | |
1596 set_i_o( _gvn.transform(new (C, 1) ProjNode(call, TypeFunc::I_O ))); | |
1597 set_all_memory_call(xcall); | |
1598 | |
1599 //return xcall; // no need, caller already has it | |
1600 } | |
1601 | |
1602 Node* GraphKit::set_results_for_java_call(CallJavaNode* call) { | |
1603 if (stopped()) return top(); // maybe the call folded up? | |
1604 | |
1605 // Capture the return value, if any. | |
1606 Node* ret; | |
1607 if (call->method() == NULL || | |
1608 call->method()->return_type()->basic_type() == T_VOID) | |
1609 ret = top(); | |
1610 else ret = _gvn.transform(new (C, 1) ProjNode(call, TypeFunc::Parms)); | |
1611 | |
1612 // Note: Since any out-of-line call can produce an exception, | |
1613 // we always insert an I_O projection from the call into the result. | |
1614 | |
1615 make_slow_call_ex(call, env()->Throwable_klass(), false); | |
1616 | |
1617 return ret; | |
1618 } | |
1619 | |
1620 //--------------------set_predefined_input_for_runtime_call-------------------- | |
1621 // Reading and setting the memory state is way conservative here. | |
1622 // The real problem is that I am not doing real Type analysis on memory, | |
1623 // so I cannot distinguish card mark stores from other stores. Across a GC | |
1624 // point the Store Barrier and the card mark memory has to agree. I cannot | |
1625 // have a card mark store and its barrier split across the GC point from | |
1626 // either above or below. Here I get that to happen by reading ALL of memory. | |
1627 // A better answer would be to separate out card marks from other memory. | |
1628 // For now, return the input memory state, so that it can be reused | |
1629 // after the call, if this call has restricted memory effects. | |
1630 Node* GraphKit::set_predefined_input_for_runtime_call(SafePointNode* call) { | |
1631 // Set fixed predefined input arguments | |
1632 Node* memory = reset_memory(); | |
1633 call->init_req( TypeFunc::Control, control() ); | |
1634 call->init_req( TypeFunc::I_O, top() ); // does no i/o | |
1635 call->init_req( TypeFunc::Memory, memory ); // may gc ptrs | |
1636 call->init_req( TypeFunc::FramePtr, frameptr() ); | |
1637 call->init_req( TypeFunc::ReturnAdr, top() ); | |
1638 return memory; | |
1639 } | |
1640 | |
1641 //-------------------set_predefined_output_for_runtime_call-------------------- | |
1642 // Set control and memory (not i_o) from the call. | |
1643 // If keep_mem is not NULL, use it for the output state, | |
1644 // except for the RawPtr output of the call, if hook_mem is TypeRawPtr::BOTTOM. | |
1645 // If hook_mem is NULL, this call produces no memory effects at all. | |
1646 // If hook_mem is a Java-visible memory slice (such as arraycopy operands), | |
1647 // then only that memory slice is taken from the call. | |
1648 // In the last case, we must put an appropriate memory barrier before | |
1649 // the call, so as to create the correct anti-dependencies on loads | |
1650 // preceding the call. | |
1651 void GraphKit::set_predefined_output_for_runtime_call(Node* call, | |
1652 Node* keep_mem, | |
1653 const TypePtr* hook_mem) { | |
1654 // no i/o | |
1655 set_control(_gvn.transform( new (C, 1) ProjNode(call,TypeFunc::Control) )); | |
1656 if (keep_mem) { | |
1657 // First clone the existing memory state | |
1658 set_all_memory(keep_mem); | |
1659 if (hook_mem != NULL) { | |
1660 // Make memory for the call | |
1661 Node* mem = _gvn.transform( new (C, 1) ProjNode(call, TypeFunc::Memory) ); | |
1662 // Set the RawPtr memory state only. This covers all the heap top/GC stuff | |
1663 // We also use hook_mem to extract specific effects from arraycopy stubs. | |
1664 set_memory(mem, hook_mem); | |
1665 } | |
1666 // ...else the call has NO memory effects. | |
1667 | |
1668 // Make sure the call advertises its memory effects precisely. | |
1669 // This lets us build accurate anti-dependences in gcm.cpp. | |
1670 assert(C->alias_type(call->adr_type()) == C->alias_type(hook_mem), | |
1671 "call node must be constructed correctly"); | |
1672 } else { | |
1673 assert(hook_mem == NULL, ""); | |
1674 // This is not a "slow path" call; all memory comes from the call. | |
1675 set_all_memory_call(call); | |
1676 } | |
1677 } | |
1678 | |
1679 //------------------------------increment_counter------------------------------ | |
1680 // for statistics: increment a VM counter by 1 | |
1681 | |
1682 void GraphKit::increment_counter(address counter_addr) { | |
1683 Node* adr1 = makecon(TypeRawPtr::make(counter_addr)); | |
1684 increment_counter(adr1); | |
1685 } | |
1686 | |
1687 void GraphKit::increment_counter(Node* counter_addr) { | |
1688 int adr_type = Compile::AliasIdxRaw; | |
1689 Node* cnt = make_load(NULL, counter_addr, TypeInt::INT, T_INT, adr_type); | |
1690 Node* incr = _gvn.transform(new (C, 3) AddINode(cnt, _gvn.intcon(1))); | |
1691 store_to_memory( NULL, counter_addr, incr, T_INT, adr_type ); | |
1692 } | |
1693 | |
1694 | |
1695 //------------------------------uncommon_trap---------------------------------- | |
1696 // Bail out to the interpreter in mid-method. Implemented by calling the | |
1697 // uncommon_trap blob. This helper function inserts a runtime call with the | |
1698 // right debug info. | |
1699 void GraphKit::uncommon_trap(int trap_request, | |
1700 ciKlass* klass, const char* comment, | |
1701 bool must_throw, | |
1702 bool keep_exact_action) { | |
1703 if (failing()) stop(); | |
1704 if (stopped()) return; // trap reachable? | |
1705 | |
1706 // Note: If ProfileTraps is true, and if a deopt. actually | |
1707 // occurs here, the runtime will make sure an MDO exists. There is | |
1708 // no need to call method()->build_method_data() at this point. | |
1709 | |
1710 #ifdef ASSERT | |
1711 if (!must_throw) { | |
1712 // Make sure the stack has at least enough depth to execute | |
1713 // the current bytecode. | |
1714 int inputs, ignore; | |
1715 if (compute_stack_effects(inputs, ignore)) { | |
1716 assert(sp() >= inputs, "must have enough JVMS stack to execute"); | |
1717 // It is a frequent error in library_call.cpp to issue an | |
1718 // uncommon trap with the _sp value already popped. | |
1719 } | |
1720 } | |
1721 #endif | |
1722 | |
1723 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request); | |
1724 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request); | |
1725 | |
1726 switch (action) { | |
1727 case Deoptimization::Action_maybe_recompile: | |
1728 case Deoptimization::Action_reinterpret: | |
1729 // Temporary fix for 6529811 to allow virtual calls to be sure they | |
1730 // get the chance to go from mono->bi->mega | |
1731 if (!keep_exact_action && | |
1732 Deoptimization::trap_request_index(trap_request) < 0 && | |
1733 too_many_recompiles(reason)) { | |
1734 // This BCI is causing too many recompilations. | |
1735 action = Deoptimization::Action_none; | |
1736 trap_request = Deoptimization::make_trap_request(reason, action); | |
1737 } else { | |
1738 C->set_trap_can_recompile(true); | |
1739 } | |
1740 break; | |
1741 case Deoptimization::Action_make_not_entrant: | |
1742 C->set_trap_can_recompile(true); | |
1743 break; | |
1744 #ifdef ASSERT | |
1745 case Deoptimization::Action_none: | |
1746 case Deoptimization::Action_make_not_compilable: | |
1747 break; | |
1748 default: | |
1749 assert(false, "bad action"); | |
1750 #endif | |
1751 } | |
1752 | |
1753 if (TraceOptoParse) { | |
1754 char buf[100]; | |
1755 tty->print_cr("Uncommon trap %s at bci:%d", | |
1756 Deoptimization::format_trap_request(buf, sizeof(buf), | |
1757 trap_request), bci()); | |
1758 } | |
1759 | |
1760 CompileLog* log = C->log(); | |
1761 if (log != NULL) { | |
1762 int kid = (klass == NULL)? -1: log->identify(klass); | |
1763 log->begin_elem("uncommon_trap bci='%d'", bci()); | |
1764 char buf[100]; | |
1765 log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf), | |
1766 trap_request)); | |
1767 if (kid >= 0) log->print(" klass='%d'", kid); | |
1768 if (comment != NULL) log->print(" comment='%s'", comment); | |
1769 log->end_elem(); | |
1770 } | |
1771 | |
1772 // Make sure any guarding test views this path as very unlikely | |
1773 Node *i0 = control()->in(0); | |
1774 if (i0 != NULL && i0->is_If()) { // Found a guarding if test? | |
1775 IfNode *iff = i0->as_If(); | |
1776 float f = iff->_prob; // Get prob | |
1777 if (control()->Opcode() == Op_IfTrue) { | |
1778 if (f > PROB_UNLIKELY_MAG(4)) | |
1779 iff->_prob = PROB_MIN; | |
1780 } else { | |
1781 if (f < PROB_LIKELY_MAG(4)) | |
1782 iff->_prob = PROB_MAX; | |
1783 } | |
1784 } | |
1785 | |
1786 // Clear out dead values from the debug info. | |
1787 kill_dead_locals(); | |
1788 | |
1789 // Now insert the uncommon trap subroutine call | |
1790 address call_addr = SharedRuntime::uncommon_trap_blob()->instructions_begin(); | |
1791 const TypePtr* no_memory_effects = NULL; | |
1792 // Pass the index of the class to be loaded | |
1793 Node* call = make_runtime_call(RC_NO_LEAF | RC_UNCOMMON | | |
1794 (must_throw ? RC_MUST_THROW : 0), | |
1795 OptoRuntime::uncommon_trap_Type(), | |
1796 call_addr, "uncommon_trap", no_memory_effects, | |
1797 intcon(trap_request)); | |
1798 assert(call->as_CallStaticJava()->uncommon_trap_request() == trap_request, | |
1799 "must extract request correctly from the graph"); | |
1800 assert(trap_request != 0, "zero value reserved by uncommon_trap_request"); | |
1801 | |
1802 call->set_req(TypeFunc::ReturnAdr, returnadr()); | |
1803 // The debug info is the only real input to this call. | |
1804 | |
1805 // Halt-and-catch fire here. The above call should never return! | |
1806 HaltNode* halt = new(C, TypeFunc::Parms) HaltNode(control(), frameptr()); | |
1807 _gvn.set_type_bottom(halt); | |
1808 root()->add_req(halt); | |
1809 | |
1810 stop_and_kill_map(); | |
1811 } | |
1812 | |
1813 | |
1814 //--------------------------just_allocated_object------------------------------ | |
1815 // Report the object that was just allocated. | |
1816 // It must be the case that there are no intervening safepoints. | |
1817 // We use this to determine if an object is so "fresh" that | |
1818 // it does not require card marks. | |
1819 Node* GraphKit::just_allocated_object(Node* current_control) { | |
1820 if (C->recent_alloc_ctl() == current_control) | |
1821 return C->recent_alloc_obj(); | |
1822 return NULL; | |
1823 } | |
1824 | |
1825 | |
1826 void GraphKit::round_double_arguments(ciMethod* dest_method) { | |
1827 // (Note: TypeFunc::make has a cache that makes this fast.) | |
1828 const TypeFunc* tf = TypeFunc::make(dest_method); | |
1829 int nargs = tf->_domain->_cnt - TypeFunc::Parms; | |
1830 for (int j = 0; j < nargs; j++) { | |
1831 const Type *targ = tf->_domain->field_at(j + TypeFunc::Parms); | |
1832 if( targ->basic_type() == T_DOUBLE ) { | |
1833 // If any parameters are doubles, they must be rounded before | |
1834 // the call, dstore_rounding does gvn.transform | |
1835 Node *arg = argument(j); | |
1836 arg = dstore_rounding(arg); | |
1837 set_argument(j, arg); | |
1838 } | |
1839 } | |
1840 } | |
1841 | |
1842 void GraphKit::round_double_result(ciMethod* dest_method) { | |
1843 // A non-strict method may return a double value which has an extended | |
1844 // exponent, but this must not be visible in a caller which is 'strict' | |
1845 // If a strict caller invokes a non-strict callee, round a double result | |
1846 | |
1847 BasicType result_type = dest_method->return_type()->basic_type(); | |
1848 assert( method() != NULL, "must have caller context"); | |
1849 if( result_type == T_DOUBLE && method()->is_strict() && !dest_method->is_strict() ) { | |
1850 // Destination method's return value is on top of stack | |
1851 // dstore_rounding() does gvn.transform | |
1852 Node *result = pop_pair(); | |
1853 result = dstore_rounding(result); | |
1854 push_pair(result); | |
1855 } | |
1856 } | |
1857 | |
1858 // rounding for strict float precision conformance | |
1859 Node* GraphKit::precision_rounding(Node* n) { | |
1860 return UseStrictFP && _method->flags().is_strict() | |
1861 && UseSSE == 0 && Matcher::strict_fp_requires_explicit_rounding | |
1862 ? _gvn.transform( new (C, 2) RoundFloatNode(0, n) ) | |
1863 : n; | |
1864 } | |
1865 | |
1866 // rounding for strict double precision conformance | |
1867 Node* GraphKit::dprecision_rounding(Node *n) { | |
1868 return UseStrictFP && _method->flags().is_strict() | |
1869 && UseSSE <= 1 && Matcher::strict_fp_requires_explicit_rounding | |
1870 ? _gvn.transform( new (C, 2) RoundDoubleNode(0, n) ) | |
1871 : n; | |
1872 } | |
1873 | |
1874 // rounding for non-strict double stores | |
1875 Node* GraphKit::dstore_rounding(Node* n) { | |
1876 return Matcher::strict_fp_requires_explicit_rounding | |
1877 && UseSSE <= 1 | |
1878 ? _gvn.transform( new (C, 2) RoundDoubleNode(0, n) ) | |
1879 : n; | |
1880 } | |
1881 | |
1882 //============================================================================= | |
1883 // Generate a fast path/slow path idiom. Graph looks like: | |
1884 // [foo] indicates that 'foo' is a parameter | |
1885 // | |
1886 // [in] NULL | |
1887 // \ / | |
1888 // CmpP | |
1889 // Bool ne | |
1890 // If | |
1891 // / \ | |
1892 // True False-<2> | |
1893 // / | | |
1894 // / cast_not_null | |
1895 // Load | | ^ | |
1896 // [fast_test] | | | |
1897 // gvn to opt_test | | | |
1898 // / \ | <1> | |
1899 // True False | | |
1900 // | \\ | | |
1901 // [slow_call] \[fast_result] | |
1902 // Ctl Val \ \ | |
1903 // | \ \ | |
1904 // Catch <1> \ \ | |
1905 // / \ ^ \ \ | |
1906 // Ex No_Ex | \ \ | |
1907 // | \ \ | \ <2> \ | |
1908 // ... \ [slow_res] | | \ [null_result] | |
1909 // \ \--+--+--- | | | |
1910 // \ | / \ | / | |
1911 // --------Region Phi | |
1912 // | |
1913 //============================================================================= | |
1914 // Code is structured as a series of driver functions all called 'do_XXX' that | |
1915 // call a set of helper functions. Helper functions first, then drivers. | |
1916 | |
1917 //------------------------------null_check_oop--------------------------------- | |
1918 // Null check oop. Set null-path control into Region in slot 3. | |
1919 // Make a cast-not-nullness use the other not-null control. Return cast. | |
1920 Node* GraphKit::null_check_oop(Node* value, Node* *null_control, | |
1921 bool never_see_null) { | |
1922 // Initial NULL check taken path | |
1923 (*null_control) = top(); | |
1924 Node* cast = null_check_common(value, T_OBJECT, false, null_control); | |
1925 | |
1926 // Generate uncommon_trap: | |
1927 if (never_see_null && (*null_control) != top()) { | |
1928 // If we see an unexpected null at a check-cast we record it and force a | |
1929 // recompile; the offending check-cast will be compiled to handle NULLs. | |
1930 // If we see more than one offending BCI, then all checkcasts in the | |
1931 // method will be compiled to handle NULLs. | |
1932 PreserveJVMState pjvms(this); | |
1933 set_control(*null_control); | |
332 | 1934 replace_in_map(value, null()); |
0 | 1935 uncommon_trap(Deoptimization::Reason_null_check, |
1936 Deoptimization::Action_make_not_entrant); | |
1937 (*null_control) = top(); // NULL path is dead | |
1938 } | |
1939 | |
1940 // Cast away null-ness on the result | |
1941 return cast; | |
1942 } | |
1943 | |
1944 //------------------------------opt_iff---------------------------------------- | |
1945 // Optimize the fast-check IfNode. Set the fast-path region slot 2. | |
1946 // Return slow-path control. | |
1947 Node* GraphKit::opt_iff(Node* region, Node* iff) { | |
1948 IfNode *opt_iff = _gvn.transform(iff)->as_If(); | |
1949 | |
1950 // Fast path taken; set region slot 2 | |
1951 Node *fast_taken = _gvn.transform( new (C, 1) IfFalseNode(opt_iff) ); | |
1952 region->init_req(2,fast_taken); // Capture fast-control | |
1953 | |
1954 // Fast path not-taken, i.e. slow path | |
1955 Node *slow_taken = _gvn.transform( new (C, 1) IfTrueNode(opt_iff) ); | |
1956 return slow_taken; | |
1957 } | |
1958 | |
1959 //-----------------------------make_runtime_call------------------------------- | |
1960 Node* GraphKit::make_runtime_call(int flags, | |
1961 const TypeFunc* call_type, address call_addr, | |
1962 const char* call_name, | |
1963 const TypePtr* adr_type, | |
1964 // The following parms are all optional. | |
1965 // The first NULL ends the list. | |
1966 Node* parm0, Node* parm1, | |
1967 Node* parm2, Node* parm3, | |
1968 Node* parm4, Node* parm5, | |
1969 Node* parm6, Node* parm7) { | |
1970 // Slow-path call | |
1971 int size = call_type->domain()->cnt(); | |
1972 bool is_leaf = !(flags & RC_NO_LEAF); | |
1973 bool has_io = (!is_leaf && !(flags & RC_NO_IO)); | |
1974 if (call_name == NULL) { | |
1975 assert(!is_leaf, "must supply name for leaf"); | |
1976 call_name = OptoRuntime::stub_name(call_addr); | |
1977 } | |
1978 CallNode* call; | |
1979 if (!is_leaf) { | |
1980 call = new(C, size) CallStaticJavaNode(call_type, call_addr, call_name, | |
1981 bci(), adr_type); | |
1982 } else if (flags & RC_NO_FP) { | |
1983 call = new(C, size) CallLeafNoFPNode(call_type, call_addr, call_name, adr_type); | |
1984 } else { | |
1985 call = new(C, size) CallLeafNode(call_type, call_addr, call_name, adr_type); | |
1986 } | |
1987 | |
1988 // The following is similar to set_edges_for_java_call, | |
1989 // except that the memory effects of the call are restricted to AliasIdxRaw. | |
1990 | |
1991 // Slow path call has no side-effects, uses few values | |
1992 bool wide_in = !(flags & RC_NARROW_MEM); | |
1993 bool wide_out = (C->get_alias_index(adr_type) == Compile::AliasIdxBot); | |
1994 | |
1995 Node* prev_mem = NULL; | |
1996 if (wide_in) { | |
1997 prev_mem = set_predefined_input_for_runtime_call(call); | |
1998 } else { | |
1999 assert(!wide_out, "narrow in => narrow out"); | |
2000 Node* narrow_mem = memory(adr_type); | |
2001 prev_mem = reset_memory(); | |
2002 map()->set_memory(narrow_mem); | |
2003 set_predefined_input_for_runtime_call(call); | |
2004 } | |
2005 | |
2006 // Hook each parm in order. Stop looking at the first NULL. | |
2007 if (parm0 != NULL) { call->init_req(TypeFunc::Parms+0, parm0); | |
2008 if (parm1 != NULL) { call->init_req(TypeFunc::Parms+1, parm1); | |
2009 if (parm2 != NULL) { call->init_req(TypeFunc::Parms+2, parm2); | |
2010 if (parm3 != NULL) { call->init_req(TypeFunc::Parms+3, parm3); | |
2011 if (parm4 != NULL) { call->init_req(TypeFunc::Parms+4, parm4); | |
2012 if (parm5 != NULL) { call->init_req(TypeFunc::Parms+5, parm5); | |
2013 if (parm6 != NULL) { call->init_req(TypeFunc::Parms+6, parm6); | |
2014 if (parm7 != NULL) { call->init_req(TypeFunc::Parms+7, parm7); | |
2015 /* close each nested if ===> */ } } } } } } } } | |
2016 assert(call->in(call->req()-1) != NULL, "must initialize all parms"); | |
2017 | |
2018 if (!is_leaf) { | |
2019 // Non-leaves can block and take safepoints: | |
2020 add_safepoint_edges(call, ((flags & RC_MUST_THROW) != 0)); | |
2021 } | |
2022 // Non-leaves can throw exceptions: | |
2023 if (has_io) { | |
2024 call->set_req(TypeFunc::I_O, i_o()); | |
2025 } | |
2026 | |
2027 if (flags & RC_UNCOMMON) { | |
2028 // Set the count to a tiny probability. Cf. Estimate_Block_Frequency. | |
2029 // (An "if" probability corresponds roughly to an unconditional count. | |
2030 // Sort of.) | |
2031 call->set_cnt(PROB_UNLIKELY_MAG(4)); | |
2032 } | |
2033 | |
2034 Node* c = _gvn.transform(call); | |
2035 assert(c == call, "cannot disappear"); | |
2036 | |
2037 if (wide_out) { | |
2038 // Slow path call has full side-effects. | |
2039 set_predefined_output_for_runtime_call(call); | |
2040 } else { | |
2041 // Slow path call has few side-effects, and/or sets few values. | |
2042 set_predefined_output_for_runtime_call(call, prev_mem, adr_type); | |
2043 } | |
2044 | |
2045 if (has_io) { | |
2046 set_i_o(_gvn.transform(new (C, 1) ProjNode(call, TypeFunc::I_O))); | |
2047 } | |
2048 return call; | |
2049 | |
2050 } | |
2051 | |
2052 //------------------------------merge_memory----------------------------------- | |
2053 // Merge memory from one path into the current memory state. | |
2054 void GraphKit::merge_memory(Node* new_mem, Node* region, int new_path) { | |
2055 for (MergeMemStream mms(merged_memory(), new_mem->as_MergeMem()); mms.next_non_empty2(); ) { | |
2056 Node* old_slice = mms.force_memory(); | |
2057 Node* new_slice = mms.memory2(); | |
2058 if (old_slice != new_slice) { | |
2059 PhiNode* phi; | |
2060 if (new_slice->is_Phi() && new_slice->as_Phi()->region() == region) { | |
2061 phi = new_slice->as_Phi(); | |
2062 #ifdef ASSERT | |
2063 if (old_slice->is_Phi() && old_slice->as_Phi()->region() == region) | |
2064 old_slice = old_slice->in(new_path); | |
2065 // Caller is responsible for ensuring that any pre-existing | |
2066 // phis are already aware of old memory. | |
2067 int old_path = (new_path > 1) ? 1 : 2; // choose old_path != new_path | |
2068 assert(phi->in(old_path) == old_slice, "pre-existing phis OK"); | |
2069 #endif | |
2070 mms.set_memory(phi); | |
2071 } else { | |
2072 phi = PhiNode::make(region, old_slice, Type::MEMORY, mms.adr_type(C)); | |
2073 _gvn.set_type(phi, Type::MEMORY); | |
2074 phi->set_req(new_path, new_slice); | |
2075 mms.set_memory(_gvn.transform(phi)); // assume it is complete | |
2076 } | |
2077 } | |
2078 } | |
2079 } | |
2080 | |
2081 //------------------------------make_slow_call_ex------------------------------ | |
2082 // Make the exception handler hookups for the slow call | |
2083 void GraphKit::make_slow_call_ex(Node* call, ciInstanceKlass* ex_klass, bool separate_io_proj) { | |
2084 if (stopped()) return; | |
2085 | |
2086 // Make a catch node with just two handlers: fall-through and catch-all | |
2087 Node* i_o = _gvn.transform( new (C, 1) ProjNode(call, TypeFunc::I_O, separate_io_proj) ); | |
2088 Node* catc = _gvn.transform( new (C, 2) CatchNode(control(), i_o, 2) ); | |
2089 Node* norm = _gvn.transform( new (C, 1) CatchProjNode(catc, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci) ); | |
2090 Node* excp = _gvn.transform( new (C, 1) CatchProjNode(catc, CatchProjNode::catch_all_index, CatchProjNode::no_handler_bci) ); | |
2091 | |
2092 { PreserveJVMState pjvms(this); | |
2093 set_control(excp); | |
2094 set_i_o(i_o); | |
2095 | |
2096 if (excp != top()) { | |
2097 // Create an exception state also. | |
2098 // Use an exact type if the caller has specified a specific exception. | |
2099 const Type* ex_type = TypeOopPtr::make_from_klass_unique(ex_klass)->cast_to_ptr_type(TypePtr::NotNull); | |
2100 Node* ex_oop = new (C, 2) CreateExNode(ex_type, control(), i_o); | |
2101 add_exception_state(make_exception_state(_gvn.transform(ex_oop))); | |
2102 } | |
2103 } | |
2104 | |
2105 // Get the no-exception control from the CatchNode. | |
2106 set_control(norm); | |
2107 } | |
2108 | |
2109 | |
2110 //-------------------------------gen_subtype_check----------------------------- | |
2111 // Generate a subtyping check. Takes as input the subtype and supertype. | |
2112 // Returns 2 values: sets the default control() to the true path and returns | |
2113 // the false path. Only reads invariant memory; sets no (visible) memory. | |
2114 // The PartialSubtypeCheckNode sets the hidden 1-word cache in the encoding | |
2115 // but that's not exposed to the optimizer. This call also doesn't take in an | |
2116 // Object; if you wish to check an Object you need to load the Object's class | |
2117 // prior to coming here. | |
2118 Node* GraphKit::gen_subtype_check(Node* subklass, Node* superklass) { | |
2119 // Fast check for identical types, perhaps identical constants. | |
2120 // The types can even be identical non-constants, in cases | |
2121 // involving Array.newInstance, Object.clone, etc. | |
2122 if (subklass == superklass) | |
2123 return top(); // false path is dead; no test needed. | |
2124 | |
2125 if (_gvn.type(superklass)->singleton()) { | |
2126 ciKlass* superk = _gvn.type(superklass)->is_klassptr()->klass(); | |
2127 ciKlass* subk = _gvn.type(subklass)->is_klassptr()->klass(); | |
2128 | |
2129 // In the common case of an exact superklass, try to fold up the | |
2130 // test before generating code. You may ask, why not just generate | |
2131 // the code and then let it fold up? The answer is that the generated | |
2132 // code will necessarily include null checks, which do not always | |
2133 // completely fold away. If they are also needless, then they turn | |
2134 // into a performance loss. Example: | |
2135 // Foo[] fa = blah(); Foo x = fa[0]; fa[1] = x; | |
2136 // Here, the type of 'fa' is often exact, so the store check | |
2137 // of fa[1]=x will fold up, without testing the nullness of x. | |
2138 switch (static_subtype_check(superk, subk)) { | |
2139 case SSC_always_false: | |
2140 { | |
2141 Node* always_fail = control(); | |
2142 set_control(top()); | |
2143 return always_fail; | |
2144 } | |
2145 case SSC_always_true: | |
2146 return top(); | |
2147 case SSC_easy_test: | |
2148 { | |
2149 // Just do a direct pointer compare and be done. | |
2150 Node* cmp = _gvn.transform( new(C, 3) CmpPNode(subklass, superklass) ); | |
2151 Node* bol = _gvn.transform( new(C, 2) BoolNode(cmp, BoolTest::eq) ); | |
2152 IfNode* iff = create_and_xform_if(control(), bol, PROB_STATIC_FREQUENT, COUNT_UNKNOWN); | |
2153 set_control( _gvn.transform( new(C, 1) IfTrueNode (iff) ) ); | |
2154 return _gvn.transform( new(C, 1) IfFalseNode(iff) ); | |
2155 } | |
2156 case SSC_full_test: | |
2157 break; | |
2158 default: | |
2159 ShouldNotReachHere(); | |
2160 } | |
2161 } | |
2162 | |
2163 // %%% Possible further optimization: Even if the superklass is not exact, | |
2164 // if the subklass is the unique subtype of the superklass, the check | |
2165 // will always succeed. We could leave a dependency behind to ensure this. | |
2166 | |
2167 // First load the super-klass's check-offset | |
2168 Node *p1 = basic_plus_adr( superklass, superklass, sizeof(oopDesc) + Klass::super_check_offset_offset_in_bytes() ); | |
2169 Node *chk_off = _gvn.transform( new (C, 3) LoadINode( NULL, memory(p1), p1, _gvn.type(p1)->is_ptr() ) ); | |
2170 int cacheoff_con = sizeof(oopDesc) + Klass::secondary_super_cache_offset_in_bytes(); | |
2171 bool might_be_cache = (find_int_con(chk_off, cacheoff_con) == cacheoff_con); | |
2172 | |
2173 // Load from the sub-klass's super-class display list, or a 1-word cache of | |
2174 // the secondary superclass list, or a failing value with a sentinel offset | |
2175 // if the super-klass is an interface or exceptionally deep in the Java | |
2176 // hierarchy and we have to scan the secondary superclass list the hard way. | |
2177 // Worst-case type is a little odd: NULL is allowed as a result (usually | |
2178 // klass loads can never produce a NULL). | |
2179 Node *chk_off_X = ConvI2X(chk_off); | |
2180 Node *p2 = _gvn.transform( new (C, 4) AddPNode(subklass,subklass,chk_off_X) ); | |
2181 // For some types like interfaces the following loadKlass is from a 1-word | |
2182 // cache which is mutable so can't use immutable memory. Other | |
2183 // types load from the super-class display table which is immutable. | |
2184 Node *kmem = might_be_cache ? memory(p2) : immutable_memory(); | |
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2185 Node *nkls = _gvn.transform( LoadKlassNode::make( _gvn, kmem, p2, _gvn.type(p2)->is_ptr(), TypeKlassPtr::OBJECT_OR_NULL ) ); |
0 | 2186 |
2187 // Compile speed common case: ARE a subtype and we canNOT fail | |
2188 if( superklass == nkls ) | |
2189 return top(); // false path is dead; no test needed. | |
2190 | |
2191 // See if we get an immediate positive hit. Happens roughly 83% of the | |
2192 // time. Test to see if the value loaded just previously from the subklass | |
2193 // is exactly the superklass. | |
2194 Node *cmp1 = _gvn.transform( new (C, 3) CmpPNode( superklass, nkls ) ); | |
2195 Node *bol1 = _gvn.transform( new (C, 2) BoolNode( cmp1, BoolTest::eq ) ); | |
2196 IfNode *iff1 = create_and_xform_if( control(), bol1, PROB_LIKELY(0.83f), COUNT_UNKNOWN ); | |
2197 Node *iftrue1 = _gvn.transform( new (C, 1) IfTrueNode ( iff1 ) ); | |
2198 set_control( _gvn.transform( new (C, 1) IfFalseNode( iff1 ) ) ); | |
2199 | |
2200 // Compile speed common case: Check for being deterministic right now. If | |
2201 // chk_off is a constant and not equal to cacheoff then we are NOT a | |
2202 // subklass. In this case we need exactly the 1 test above and we can | |
2203 // return those results immediately. | |
2204 if (!might_be_cache) { | |
2205 Node* not_subtype_ctrl = control(); | |
2206 set_control(iftrue1); // We need exactly the 1 test above | |
2207 return not_subtype_ctrl; | |
2208 } | |
2209 | |
2210 // Gather the various success & failures here | |
2211 RegionNode *r_ok_subtype = new (C, 4) RegionNode(4); | |
2212 record_for_igvn(r_ok_subtype); | |
2213 RegionNode *r_not_subtype = new (C, 3) RegionNode(3); | |
2214 record_for_igvn(r_not_subtype); | |
2215 | |
2216 r_ok_subtype->init_req(1, iftrue1); | |
2217 | |
2218 // Check for immediate negative hit. Happens roughly 11% of the time (which | |
2219 // is roughly 63% of the remaining cases). Test to see if the loaded | |
2220 // check-offset points into the subklass display list or the 1-element | |
2221 // cache. If it points to the display (and NOT the cache) and the display | |
2222 // missed then it's not a subtype. | |
2223 Node *cacheoff = _gvn.intcon(cacheoff_con); | |
2224 Node *cmp2 = _gvn.transform( new (C, 3) CmpINode( chk_off, cacheoff ) ); | |
2225 Node *bol2 = _gvn.transform( new (C, 2) BoolNode( cmp2, BoolTest::ne ) ); | |
2226 IfNode *iff2 = create_and_xform_if( control(), bol2, PROB_LIKELY(0.63f), COUNT_UNKNOWN ); | |
2227 r_not_subtype->init_req(1, _gvn.transform( new (C, 1) IfTrueNode (iff2) ) ); | |
2228 set_control( _gvn.transform( new (C, 1) IfFalseNode(iff2) ) ); | |
2229 | |
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2230 // Check for self. Very rare to get here, but it is taken 1/3 the time. |
0 | 2231 // No performance impact (too rare) but allows sharing of secondary arrays |
2232 // which has some footprint reduction. | |
2233 Node *cmp3 = _gvn.transform( new (C, 3) CmpPNode( subklass, superklass ) ); | |
2234 Node *bol3 = _gvn.transform( new (C, 2) BoolNode( cmp3, BoolTest::eq ) ); | |
2235 IfNode *iff3 = create_and_xform_if( control(), bol3, PROB_LIKELY(0.36f), COUNT_UNKNOWN ); | |
2236 r_ok_subtype->init_req(2, _gvn.transform( new (C, 1) IfTrueNode ( iff3 ) ) ); | |
2237 set_control( _gvn.transform( new (C, 1) IfFalseNode( iff3 ) ) ); | |
2238 | |
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2239 // -- Roads not taken here: -- |
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2240 // We could also have chosen to perform the self-check at the beginning |
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2241 // of this code sequence, as the assembler does. This would not pay off |
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2242 // the same way, since the optimizer, unlike the assembler, can perform |
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2243 // static type analysis to fold away many successful self-checks. |
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2244 // Non-foldable self checks work better here in second position, because |
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2245 // the initial primary superclass check subsumes a self-check for most |
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2246 // types. An exception would be a secondary type like array-of-interface, |
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2247 // which does not appear in its own primary supertype display. |
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2248 // Finally, we could have chosen to move the self-check into the |
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2249 // PartialSubtypeCheckNode, and from there out-of-line in a platform |
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2250 // dependent manner. But it is worthwhile to have the check here, |
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2251 // where it can be perhaps be optimized. The cost in code space is |
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2252 // small (register compare, branch). |
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2253 |
0 | 2254 // Now do a linear scan of the secondary super-klass array. Again, no real |
2255 // performance impact (too rare) but it's gotta be done. | |
2256 // Since the code is rarely used, there is no penalty for moving it | |
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2257 // out of line, and it can only improve I-cache density. |
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2258 // The decision to inline or out-of-line this final check is platform |
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2259 // dependent, and is found in the AD file definition of PartialSubtypeCheck. |
0 | 2260 Node* psc = _gvn.transform( |
2261 new (C, 3) PartialSubtypeCheckNode(control(), subklass, superklass) ); | |
2262 | |
2263 Node *cmp4 = _gvn.transform( new (C, 3) CmpPNode( psc, null() ) ); | |
2264 Node *bol4 = _gvn.transform( new (C, 2) BoolNode( cmp4, BoolTest::ne ) ); | |
2265 IfNode *iff4 = create_and_xform_if( control(), bol4, PROB_FAIR, COUNT_UNKNOWN ); | |
2266 r_not_subtype->init_req(2, _gvn.transform( new (C, 1) IfTrueNode (iff4) ) ); | |
2267 r_ok_subtype ->init_req(3, _gvn.transform( new (C, 1) IfFalseNode(iff4) ) ); | |
2268 | |
2269 // Return false path; set default control to true path. | |
2270 set_control( _gvn.transform(r_ok_subtype) ); | |
2271 return _gvn.transform(r_not_subtype); | |
2272 } | |
2273 | |
2274 //----------------------------static_subtype_check----------------------------- | |
2275 // Shortcut important common cases when superklass is exact: | |
2276 // (0) superklass is java.lang.Object (can occur in reflective code) | |
2277 // (1) subklass is already limited to a subtype of superklass => always ok | |
2278 // (2) subklass does not overlap with superklass => always fail | |
2279 // (3) superklass has NO subtypes and we can check with a simple compare. | |
2280 int GraphKit::static_subtype_check(ciKlass* superk, ciKlass* subk) { | |
2281 if (StressReflectiveCode) { | |
2282 return SSC_full_test; // Let caller generate the general case. | |
2283 } | |
2284 | |
2285 if (superk == env()->Object_klass()) { | |
2286 return SSC_always_true; // (0) this test cannot fail | |
2287 } | |
2288 | |
2289 ciType* superelem = superk; | |
2290 if (superelem->is_array_klass()) | |
2291 superelem = superelem->as_array_klass()->base_element_type(); | |
2292 | |
2293 if (!subk->is_interface()) { // cannot trust static interface types yet | |
2294 if (subk->is_subtype_of(superk)) { | |
2295 return SSC_always_true; // (1) false path dead; no dynamic test needed | |
2296 } | |
2297 if (!(superelem->is_klass() && superelem->as_klass()->is_interface()) && | |
2298 !superk->is_subtype_of(subk)) { | |
2299 return SSC_always_false; | |
2300 } | |
2301 } | |
2302 | |
2303 // If casting to an instance klass, it must have no subtypes | |
2304 if (superk->is_interface()) { | |
2305 // Cannot trust interfaces yet. | |
2306 // %%% S.B. superk->nof_implementors() == 1 | |
2307 } else if (superelem->is_instance_klass()) { | |
2308 ciInstanceKlass* ik = superelem->as_instance_klass(); | |
2309 if (!ik->has_subklass() && !ik->is_interface()) { | |
2310 if (!ik->is_final()) { | |
2311 // Add a dependency if there is a chance of a later subclass. | |
2312 C->dependencies()->assert_leaf_type(ik); | |
2313 } | |
2314 return SSC_easy_test; // (3) caller can do a simple ptr comparison | |
2315 } | |
2316 } else { | |
2317 // A primitive array type has no subtypes. | |
2318 return SSC_easy_test; // (3) caller can do a simple ptr comparison | |
2319 } | |
2320 | |
2321 return SSC_full_test; | |
2322 } | |
2323 | |
2324 // Profile-driven exact type check: | |
2325 Node* GraphKit::type_check_receiver(Node* receiver, ciKlass* klass, | |
2326 float prob, | |
2327 Node* *casted_receiver) { | |
2328 const TypeKlassPtr* tklass = TypeKlassPtr::make(klass); | |
2329 Node* recv_klass = load_object_klass(receiver); | |
2330 Node* want_klass = makecon(tklass); | |
2331 Node* cmp = _gvn.transform( new(C, 3) CmpPNode(recv_klass, want_klass) ); | |
2332 Node* bol = _gvn.transform( new(C, 2) BoolNode(cmp, BoolTest::eq) ); | |
2333 IfNode* iff = create_and_xform_if(control(), bol, prob, COUNT_UNKNOWN); | |
2334 set_control( _gvn.transform( new(C, 1) IfTrueNode (iff) )); | |
2335 Node* fail = _gvn.transform( new(C, 1) IfFalseNode(iff) ); | |
2336 | |
2337 const TypeOopPtr* recv_xtype = tklass->as_instance_type(); | |
2338 assert(recv_xtype->klass_is_exact(), ""); | |
2339 | |
2340 // Subsume downstream occurrences of receiver with a cast to | |
2341 // recv_xtype, since now we know what the type will be. | |
2342 Node* cast = new(C, 2) CheckCastPPNode(control(), receiver, recv_xtype); | |
2343 (*casted_receiver) = _gvn.transform(cast); | |
2344 // (User must make the replace_in_map call.) | |
2345 | |
2346 return fail; | |
2347 } | |
2348 | |
2349 | |
2350 //-------------------------------gen_instanceof-------------------------------- | |
2351 // Generate an instance-of idiom. Used by both the instance-of bytecode | |
2352 // and the reflective instance-of call. | |
2353 Node* GraphKit::gen_instanceof( Node *subobj, Node* superklass ) { | |
2354 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
2355 assert( !stopped(), "dead parse path should be checked in callers" ); | |
2356 assert(!TypePtr::NULL_PTR->higher_equal(_gvn.type(superklass)->is_klassptr()), | |
2357 "must check for not-null not-dead klass in callers"); | |
2358 | |
2359 // Make the merge point | |
2360 enum { _obj_path = 1, _fail_path, _null_path, PATH_LIMIT }; | |
2361 RegionNode* region = new(C, PATH_LIMIT) RegionNode(PATH_LIMIT); | |
2362 Node* phi = new(C, PATH_LIMIT) PhiNode(region, TypeInt::BOOL); | |
2363 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
2364 | |
2365 // Null check; get casted pointer; set region slot 3 | |
2366 Node* null_ctl = top(); | |
2367 Node* not_null_obj = null_check_oop(subobj, &null_ctl); | |
2368 | |
2369 // If not_null_obj is dead, only null-path is taken | |
2370 if (stopped()) { // Doing instance-of on a NULL? | |
2371 set_control(null_ctl); | |
2372 return intcon(0); | |
2373 } | |
2374 region->init_req(_null_path, null_ctl); | |
2375 phi ->init_req(_null_path, intcon(0)); // Set null path value | |
2376 | |
2377 // Load the object's klass | |
2378 Node* obj_klass = load_object_klass(not_null_obj); | |
2379 | |
2380 // Generate the subtype check | |
2381 Node* not_subtype_ctrl = gen_subtype_check(obj_klass, superklass); | |
2382 | |
2383 // Plug in the success path to the general merge in slot 1. | |
2384 region->init_req(_obj_path, control()); | |
2385 phi ->init_req(_obj_path, intcon(1)); | |
2386 | |
2387 // Plug in the failing path to the general merge in slot 2. | |
2388 region->init_req(_fail_path, not_subtype_ctrl); | |
2389 phi ->init_req(_fail_path, intcon(0)); | |
2390 | |
2391 // Return final merged results | |
2392 set_control( _gvn.transform(region) ); | |
2393 record_for_igvn(region); | |
2394 return _gvn.transform(phi); | |
2395 } | |
2396 | |
2397 //-------------------------------gen_checkcast--------------------------------- | |
2398 // Generate a checkcast idiom. Used by both the checkcast bytecode and the | |
2399 // array store bytecode. Stack must be as-if BEFORE doing the bytecode so the | |
2400 // uncommon-trap paths work. Adjust stack after this call. | |
2401 // If failure_control is supplied and not null, it is filled in with | |
2402 // the control edge for the cast failure. Otherwise, an appropriate | |
2403 // uncommon trap or exception is thrown. | |
2404 Node* GraphKit::gen_checkcast(Node *obj, Node* superklass, | |
2405 Node* *failure_control) { | |
2406 kill_dead_locals(); // Benefit all the uncommon traps | |
2407 const TypeKlassPtr *tk = _gvn.type(superklass)->is_klassptr(); | |
2408 const Type *toop = TypeOopPtr::make_from_klass(tk->klass()); | |
2409 | |
2410 // Fast cutout: Check the case that the cast is vacuously true. | |
2411 // This detects the common cases where the test will short-circuit | |
2412 // away completely. We do this before we perform the null check, | |
2413 // because if the test is going to turn into zero code, we don't | |
2414 // want a residual null check left around. (Causes a slowdown, | |
2415 // for example, in some objArray manipulations, such as a[i]=a[j].) | |
2416 if (tk->singleton()) { | |
2417 const TypeOopPtr* objtp = _gvn.type(obj)->isa_oopptr(); | |
2418 if (objtp != NULL && objtp->klass() != NULL) { | |
2419 switch (static_subtype_check(tk->klass(), objtp->klass())) { | |
2420 case SSC_always_true: | |
2421 return obj; | |
2422 case SSC_always_false: | |
2423 // It needs a null check because a null will *pass* the cast check. | |
2424 // A non-null value will always produce an exception. | |
2425 return do_null_assert(obj, T_OBJECT); | |
2426 } | |
2427 } | |
2428 } | |
2429 | |
2430 ciProfileData* data = NULL; | |
2431 if (failure_control == NULL) { // use MDO in regular case only | |
2432 assert(java_bc() == Bytecodes::_aastore || | |
2433 java_bc() == Bytecodes::_checkcast, | |
2434 "interpreter profiles type checks only for these BCs"); | |
2435 data = method()->method_data()->bci_to_data(bci()); | |
2436 } | |
2437 | |
2438 // Make the merge point | |
2439 enum { _obj_path = 1, _null_path, PATH_LIMIT }; | |
2440 RegionNode* region = new (C, PATH_LIMIT) RegionNode(PATH_LIMIT); | |
2441 Node* phi = new (C, PATH_LIMIT) PhiNode(region, toop); | |
2442 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
2443 | |
2444 // Use null-cast information if it is available | |
2445 bool never_see_null = false; | |
2446 // If we see an unexpected null at a check-cast we record it and force a | |
2447 // recompile; the offending check-cast will be compiled to handle NULLs. | |
2448 // If we see several offending BCIs, then all checkcasts in the | |
2449 // method will be compiled to handle NULLs. | |
2450 if (UncommonNullCast // Cutout for this technique | |
2451 && failure_control == NULL // regular case | |
2452 && obj != null() // And not the -Xcomp stupid case? | |
2453 && !too_many_traps(Deoptimization::Reason_null_check)) { | |
2454 // Finally, check the "null_seen" bit from the interpreter. | |
2455 if (data == NULL || !data->as_BitData()->null_seen()) { | |
2456 never_see_null = true; | |
2457 } | |
2458 } | |
2459 | |
2460 // Null check; get casted pointer; set region slot 3 | |
2461 Node* null_ctl = top(); | |
2462 Node* not_null_obj = null_check_oop(obj, &null_ctl, never_see_null); | |
2463 | |
2464 // If not_null_obj is dead, only null-path is taken | |
2465 if (stopped()) { // Doing instance-of on a NULL? | |
2466 set_control(null_ctl); | |
2467 return null(); | |
2468 } | |
2469 region->init_req(_null_path, null_ctl); | |
2470 phi ->init_req(_null_path, null()); // Set null path value | |
2471 | |
2472 Node* cast_obj = NULL; // the casted version of the object | |
2473 | |
2474 // If the profile has seen exactly one type, narrow to that type. | |
2475 // (The subsequent subtype check will always fold up.) | |
2476 if (UseTypeProfile && TypeProfileCasts && data != NULL && | |
2477 // Counter has never been decremented (due to cast failure). | |
2478 // ...This is a reasonable thing to expect. It is true of | |
2479 // all casts inserted by javac to implement generic types. | |
2480 data->as_CounterData()->count() >= 0 && | |
2481 !too_many_traps(Deoptimization::Reason_class_check)) { | |
2482 // (No, this isn't a call, but it's enough like a virtual call | |
2483 // to use the same ciMethod accessor to get the profile info...) | |
2484 ciCallProfile profile = method()->call_profile_at_bci(bci()); | |
2485 if (profile.count() >= 0 && // no cast failures here | |
2486 profile.has_receiver(0) && | |
2487 profile.morphism() == 1) { | |
2488 ciKlass* exact_kls = profile.receiver(0); | |
2489 int ssc = static_subtype_check(tk->klass(), exact_kls); | |
2490 if (ssc == SSC_always_true) { | |
2491 // If we narrow the type to match what the type profile sees, | |
2492 // we can then remove the rest of the cast. | |
2493 // This is a win, even if the exact_kls is very specific, | |
2494 // because downstream operations, such as method calls, | |
2495 // will often benefit from the sharper type. | |
2496 Node* exact_obj = not_null_obj; // will get updated in place... | |
2497 Node* slow_ctl = type_check_receiver(exact_obj, exact_kls, 1.0, | |
2498 &exact_obj); | |
2499 { PreserveJVMState pjvms(this); | |
2500 set_control(slow_ctl); | |
2501 uncommon_trap(Deoptimization::Reason_class_check, | |
2502 Deoptimization::Action_maybe_recompile); | |
2503 } | |
2504 if (failure_control != NULL) // failure is now impossible | |
2505 (*failure_control) = top(); | |
2506 replace_in_map(not_null_obj, exact_obj); | |
2507 // adjust the type of the phi to the exact klass: | |
2508 phi->raise_bottom_type(_gvn.type(exact_obj)->meet(TypePtr::NULL_PTR)); | |
2509 cast_obj = exact_obj; | |
2510 } | |
2511 // assert(cast_obj != NULL)... except maybe the profile lied to us. | |
2512 } | |
2513 } | |
2514 | |
2515 if (cast_obj == NULL) { | |
2516 // Load the object's klass | |
2517 Node* obj_klass = load_object_klass(not_null_obj); | |
2518 | |
2519 // Generate the subtype check | |
2520 Node* not_subtype_ctrl = gen_subtype_check( obj_klass, superklass ); | |
2521 | |
2522 // Plug in success path into the merge | |
2523 cast_obj = _gvn.transform(new (C, 2) CheckCastPPNode(control(), | |
2524 not_null_obj, toop)); | |
2525 // Failure path ends in uncommon trap (or may be dead - failure impossible) | |
2526 if (failure_control == NULL) { | |
2527 if (not_subtype_ctrl != top()) { // If failure is possible | |
2528 PreserveJVMState pjvms(this); | |
2529 set_control(not_subtype_ctrl); | |
2530 builtin_throw(Deoptimization::Reason_class_check, obj_klass); | |
2531 } | |
2532 } else { | |
2533 (*failure_control) = not_subtype_ctrl; | |
2534 } | |
2535 } | |
2536 | |
2537 region->init_req(_obj_path, control()); | |
2538 phi ->init_req(_obj_path, cast_obj); | |
2539 | |
2540 // A merge of NULL or Casted-NotNull obj | |
2541 Node* res = _gvn.transform(phi); | |
2542 | |
2543 // Note I do NOT always 'replace_in_map(obj,result)' here. | |
2544 // if( tk->klass()->can_be_primary_super() ) | |
2545 // This means that if I successfully store an Object into an array-of-String | |
2546 // I 'forget' that the Object is really now known to be a String. I have to | |
2547 // do this because we don't have true union types for interfaces - if I store | |
2548 // a Baz into an array-of-Interface and then tell the optimizer it's an | |
2549 // Interface, I forget that it's also a Baz and cannot do Baz-like field | |
2550 // references to it. FIX THIS WHEN UNION TYPES APPEAR! | |
2551 // replace_in_map( obj, res ); | |
2552 | |
2553 // Return final merged results | |
2554 set_control( _gvn.transform(region) ); | |
2555 record_for_igvn(region); | |
2556 return res; | |
2557 } | |
2558 | |
2559 //------------------------------next_monitor----------------------------------- | |
2560 // What number should be given to the next monitor? | |
2561 int GraphKit::next_monitor() { | |
2562 int current = jvms()->monitor_depth()* C->sync_stack_slots(); | |
2563 int next = current + C->sync_stack_slots(); | |
2564 // Keep the toplevel high water mark current: | |
2565 if (C->fixed_slots() < next) C->set_fixed_slots(next); | |
2566 return current; | |
2567 } | |
2568 | |
2569 //------------------------------insert_mem_bar--------------------------------- | |
2570 // Memory barrier to avoid floating things around | |
2571 // The membar serves as a pinch point between both control and all memory slices. | |
2572 Node* GraphKit::insert_mem_bar(int opcode, Node* precedent) { | |
2573 MemBarNode* mb = MemBarNode::make(C, opcode, Compile::AliasIdxBot, precedent); | |
2574 mb->init_req(TypeFunc::Control, control()); | |
2575 mb->init_req(TypeFunc::Memory, reset_memory()); | |
2576 Node* membar = _gvn.transform(mb); | |
2577 set_control(_gvn.transform(new (C, 1) ProjNode(membar,TypeFunc::Control) )); | |
2578 set_all_memory_call(membar); | |
2579 return membar; | |
2580 } | |
2581 | |
2582 //-------------------------insert_mem_bar_volatile---------------------------- | |
2583 // Memory barrier to avoid floating things around | |
2584 // The membar serves as a pinch point between both control and memory(alias_idx). | |
2585 // If you want to make a pinch point on all memory slices, do not use this | |
2586 // function (even with AliasIdxBot); use insert_mem_bar() instead. | |
2587 Node* GraphKit::insert_mem_bar_volatile(int opcode, int alias_idx, Node* precedent) { | |
2588 // When Parse::do_put_xxx updates a volatile field, it appends a series | |
2589 // of MemBarVolatile nodes, one for *each* volatile field alias category. | |
2590 // The first membar is on the same memory slice as the field store opcode. | |
2591 // This forces the membar to follow the store. (Bug 6500685 broke this.) | |
2592 // All the other membars (for other volatile slices, including AliasIdxBot, | |
2593 // which stands for all unknown volatile slices) are control-dependent | |
2594 // on the first membar. This prevents later volatile loads or stores | |
2595 // from sliding up past the just-emitted store. | |
2596 | |
2597 MemBarNode* mb = MemBarNode::make(C, opcode, alias_idx, precedent); | |
2598 mb->set_req(TypeFunc::Control,control()); | |
2599 if (alias_idx == Compile::AliasIdxBot) { | |
2600 mb->set_req(TypeFunc::Memory, merged_memory()->base_memory()); | |
2601 } else { | |
2602 assert(!(opcode == Op_Initialize && alias_idx != Compile::AliasIdxRaw), "fix caller"); | |
2603 mb->set_req(TypeFunc::Memory, memory(alias_idx)); | |
2604 } | |
2605 Node* membar = _gvn.transform(mb); | |
2606 set_control(_gvn.transform(new (C, 1) ProjNode(membar, TypeFunc::Control))); | |
2607 if (alias_idx == Compile::AliasIdxBot) { | |
2608 merged_memory()->set_base_memory(_gvn.transform(new (C, 1) ProjNode(membar, TypeFunc::Memory))); | |
2609 } else { | |
2610 set_memory(_gvn.transform(new (C, 1) ProjNode(membar, TypeFunc::Memory)),alias_idx); | |
2611 } | |
2612 return membar; | |
2613 } | |
2614 | |
2615 //------------------------------shared_lock------------------------------------ | |
2616 // Emit locking code. | |
2617 FastLockNode* GraphKit::shared_lock(Node* obj) { | |
2618 // bci is either a monitorenter bc or InvocationEntryBci | |
2619 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces | |
2620 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); | |
2621 | |
2622 if( !GenerateSynchronizationCode ) | |
2623 return NULL; // Not locking things? | |
2624 if (stopped()) // Dead monitor? | |
2625 return NULL; | |
2626 | |
2627 assert(dead_locals_are_killed(), "should kill locals before sync. point"); | |
2628 | |
2629 // Box the stack location | |
2630 Node* box = _gvn.transform(new (C, 1) BoxLockNode(next_monitor())); | |
2631 Node* mem = reset_memory(); | |
2632 | |
2633 FastLockNode * flock = _gvn.transform(new (C, 3) FastLockNode(0, obj, box) )->as_FastLock(); | |
2634 if (PrintPreciseBiasedLockingStatistics) { | |
2635 // Create the counters for this fast lock. | |
2636 flock->create_lock_counter(sync_jvms()); // sync_jvms used to get current bci | |
2637 } | |
2638 // Add monitor to debug info for the slow path. If we block inside the | |
2639 // slow path and de-opt, we need the monitor hanging around | |
2640 map()->push_monitor( flock ); | |
2641 | |
2642 const TypeFunc *tf = LockNode::lock_type(); | |
2643 LockNode *lock = new (C, tf->domain()->cnt()) LockNode(C, tf); | |
2644 | |
2645 lock->init_req( TypeFunc::Control, control() ); | |
2646 lock->init_req( TypeFunc::Memory , mem ); | |
2647 lock->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
2648 lock->init_req( TypeFunc::FramePtr, frameptr() ); | |
2649 lock->init_req( TypeFunc::ReturnAdr, top() ); | |
2650 | |
2651 lock->init_req(TypeFunc::Parms + 0, obj); | |
2652 lock->init_req(TypeFunc::Parms + 1, box); | |
2653 lock->init_req(TypeFunc::Parms + 2, flock); | |
2654 add_safepoint_edges(lock); | |
2655 | |
2656 lock = _gvn.transform( lock )->as_Lock(); | |
2657 | |
2658 // lock has no side-effects, sets few values | |
2659 set_predefined_output_for_runtime_call(lock, mem, TypeRawPtr::BOTTOM); | |
2660 | |
2661 insert_mem_bar(Op_MemBarAcquire); | |
2662 | |
2663 // Add this to the worklist so that the lock can be eliminated | |
2664 record_for_igvn(lock); | |
2665 | |
2666 #ifndef PRODUCT | |
2667 if (PrintLockStatistics) { | |
2668 // Update the counter for this lock. Don't bother using an atomic | |
2669 // operation since we don't require absolute accuracy. | |
2670 lock->create_lock_counter(map()->jvms()); | |
2671 int adr_type = Compile::AliasIdxRaw; | |
2672 Node* counter_addr = makecon(TypeRawPtr::make(lock->counter()->addr())); | |
2673 Node* cnt = make_load(NULL, counter_addr, TypeInt::INT, T_INT, adr_type); | |
2674 Node* incr = _gvn.transform(new (C, 3) AddINode(cnt, _gvn.intcon(1))); | |
2675 store_to_memory(control(), counter_addr, incr, T_INT, adr_type); | |
2676 } | |
2677 #endif | |
2678 | |
2679 return flock; | |
2680 } | |
2681 | |
2682 | |
2683 //------------------------------shared_unlock---------------------------------- | |
2684 // Emit unlocking code. | |
2685 void GraphKit::shared_unlock(Node* box, Node* obj) { | |
2686 // bci is either a monitorenter bc or InvocationEntryBci | |
2687 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces | |
2688 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); | |
2689 | |
2690 if( !GenerateSynchronizationCode ) | |
2691 return; | |
2692 if (stopped()) { // Dead monitor? | |
2693 map()->pop_monitor(); // Kill monitor from debug info | |
2694 return; | |
2695 } | |
2696 | |
2697 // Memory barrier to avoid floating things down past the locked region | |
2698 insert_mem_bar(Op_MemBarRelease); | |
2699 | |
2700 const TypeFunc *tf = OptoRuntime::complete_monitor_exit_Type(); | |
2701 UnlockNode *unlock = new (C, tf->domain()->cnt()) UnlockNode(C, tf); | |
2702 uint raw_idx = Compile::AliasIdxRaw; | |
2703 unlock->init_req( TypeFunc::Control, control() ); | |
2704 unlock->init_req( TypeFunc::Memory , memory(raw_idx) ); | |
2705 unlock->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
2706 unlock->init_req( TypeFunc::FramePtr, frameptr() ); | |
2707 unlock->init_req( TypeFunc::ReturnAdr, top() ); | |
2708 | |
2709 unlock->init_req(TypeFunc::Parms + 0, obj); | |
2710 unlock->init_req(TypeFunc::Parms + 1, box); | |
2711 unlock = _gvn.transform(unlock)->as_Unlock(); | |
2712 | |
2713 Node* mem = reset_memory(); | |
2714 | |
2715 // unlock has no side-effects, sets few values | |
2716 set_predefined_output_for_runtime_call(unlock, mem, TypeRawPtr::BOTTOM); | |
2717 | |
2718 // Kill monitor from debug info | |
2719 map()->pop_monitor( ); | |
2720 } | |
2721 | |
2722 //-------------------------------get_layout_helper----------------------------- | |
2723 // If the given klass is a constant or known to be an array, | |
2724 // fetch the constant layout helper value into constant_value | |
2725 // and return (Node*)NULL. Otherwise, load the non-constant | |
2726 // layout helper value, and return the node which represents it. | |
2727 // This two-faced routine is useful because allocation sites | |
2728 // almost always feature constant types. | |
2729 Node* GraphKit::get_layout_helper(Node* klass_node, jint& constant_value) { | |
2730 const TypeKlassPtr* inst_klass = _gvn.type(klass_node)->isa_klassptr(); | |
2731 if (!StressReflectiveCode && inst_klass != NULL) { | |
2732 ciKlass* klass = inst_klass->klass(); | |
2733 bool xklass = inst_klass->klass_is_exact(); | |
2734 if (xklass || klass->is_array_klass()) { | |
2735 jint lhelper = klass->layout_helper(); | |
2736 if (lhelper != Klass::_lh_neutral_value) { | |
2737 constant_value = lhelper; | |
2738 return (Node*) NULL; | |
2739 } | |
2740 } | |
2741 } | |
2742 constant_value = Klass::_lh_neutral_value; // put in a known value | |
2743 Node* lhp = basic_plus_adr(klass_node, klass_node, Klass::layout_helper_offset_in_bytes() + sizeof(oopDesc)); | |
2744 return make_load(NULL, lhp, TypeInt::INT, T_INT); | |
2745 } | |
2746 | |
2747 // We just put in an allocate/initialize with a big raw-memory effect. | |
2748 // Hook selected additional alias categories on the initialization. | |
2749 static void hook_memory_on_init(GraphKit& kit, int alias_idx, | |
2750 MergeMemNode* init_in_merge, | |
2751 Node* init_out_raw) { | |
2752 DEBUG_ONLY(Node* init_in_raw = init_in_merge->base_memory()); | |
2753 assert(init_in_merge->memory_at(alias_idx) == init_in_raw, ""); | |
2754 | |
2755 Node* prevmem = kit.memory(alias_idx); | |
2756 init_in_merge->set_memory_at(alias_idx, prevmem); | |
2757 kit.set_memory(init_out_raw, alias_idx); | |
2758 } | |
2759 | |
2760 //---------------------------set_output_for_allocation------------------------- | |
2761 Node* GraphKit::set_output_for_allocation(AllocateNode* alloc, | |
2762 const TypeOopPtr* oop_type, | |
2763 bool raw_mem_only) { | |
2764 int rawidx = Compile::AliasIdxRaw; | |
2765 alloc->set_req( TypeFunc::FramePtr, frameptr() ); | |
2766 add_safepoint_edges(alloc); | |
2767 Node* allocx = _gvn.transform(alloc); | |
2768 set_control( _gvn.transform(new (C, 1) ProjNode(allocx, TypeFunc::Control) ) ); | |
2769 // create memory projection for i_o | |
2770 set_memory ( _gvn.transform( new (C, 1) ProjNode(allocx, TypeFunc::Memory, true) ), rawidx ); | |
2771 make_slow_call_ex(allocx, env()->OutOfMemoryError_klass(), true); | |
2772 | |
2773 // create a memory projection as for the normal control path | |
2774 Node* malloc = _gvn.transform(new (C, 1) ProjNode(allocx, TypeFunc::Memory)); | |
2775 set_memory(malloc, rawidx); | |
2776 | |
2777 // a normal slow-call doesn't change i_o, but an allocation does | |
2778 // we create a separate i_o projection for the normal control path | |
2779 set_i_o(_gvn.transform( new (C, 1) ProjNode(allocx, TypeFunc::I_O, false) ) ); | |
2780 Node* rawoop = _gvn.transform( new (C, 1) ProjNode(allocx, TypeFunc::Parms) ); | |
2781 | |
2782 // put in an initialization barrier | |
2783 InitializeNode* init = insert_mem_bar_volatile(Op_Initialize, rawidx, | |
2784 rawoop)->as_Initialize(); | |
2785 assert(alloc->initialization() == init, "2-way macro link must work"); | |
2786 assert(init ->allocation() == alloc, "2-way macro link must work"); | |
2787 if (ReduceFieldZeroing && !raw_mem_only) { | |
2788 // Extract memory strands which may participate in the new object's | |
2789 // initialization, and source them from the new InitializeNode. | |
2790 // This will allow us to observe initializations when they occur, | |
2791 // and link them properly (as a group) to the InitializeNode. | |
2792 assert(init->in(InitializeNode::Memory) == malloc, ""); | |
2793 MergeMemNode* minit_in = MergeMemNode::make(C, malloc); | |
2794 init->set_req(InitializeNode::Memory, minit_in); | |
2795 record_for_igvn(minit_in); // fold it up later, if possible | |
2796 Node* minit_out = memory(rawidx); | |
2797 assert(minit_out->is_Proj() && minit_out->in(0) == init, ""); | |
2798 if (oop_type->isa_aryptr()) { | |
2799 const TypePtr* telemref = oop_type->add_offset(Type::OffsetBot); | |
2800 int elemidx = C->get_alias_index(telemref); | |
2801 hook_memory_on_init(*this, elemidx, minit_in, minit_out); | |
2802 } else if (oop_type->isa_instptr()) { | |
2803 ciInstanceKlass* ik = oop_type->klass()->as_instance_klass(); | |
2804 for (int i = 0, len = ik->nof_nonstatic_fields(); i < len; i++) { | |
2805 ciField* field = ik->nonstatic_field_at(i); | |
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2806 if (field->offset() >= TrackedInitializationLimit * HeapWordSize) |
0 | 2807 continue; // do not bother to track really large numbers of fields |
2808 // Find (or create) the alias category for this field: | |
2809 int fieldidx = C->alias_type(field)->index(); | |
2810 hook_memory_on_init(*this, fieldidx, minit_in, minit_out); | |
2811 } | |
2812 } | |
2813 } | |
2814 | |
2815 // Cast raw oop to the real thing... | |
2816 Node* javaoop = new (C, 2) CheckCastPPNode(control(), rawoop, oop_type); | |
2817 javaoop = _gvn.transform(javaoop); | |
2818 C->set_recent_alloc(control(), javaoop); | |
2819 assert(just_allocated_object(control()) == javaoop, "just allocated"); | |
2820 | |
2821 #ifdef ASSERT | |
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2822 { // Verify that the AllocateNode::Ideal_allocation recognizers work: |
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2823 assert(AllocateNode::Ideal_allocation(rawoop, &_gvn) == alloc, |
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2824 "Ideal_allocation works"); |
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2825 assert(AllocateNode::Ideal_allocation(javaoop, &_gvn) == alloc, |
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2826 "Ideal_allocation works"); |
0 | 2827 if (alloc->is_AllocateArray()) { |
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2828 assert(AllocateArrayNode::Ideal_array_allocation(rawoop, &_gvn) == alloc->as_AllocateArray(), |
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2829 "Ideal_allocation works"); |
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2830 assert(AllocateArrayNode::Ideal_array_allocation(javaoop, &_gvn) == alloc->as_AllocateArray(), |
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2831 "Ideal_allocation works"); |
0 | 2832 } else { |
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2833 assert(alloc->in(AllocateNode::ALength)->is_top(), "no length, please"); |
0 | 2834 } |
2835 } | |
2836 #endif //ASSERT | |
2837 | |
2838 return javaoop; | |
2839 } | |
2840 | |
2841 //---------------------------new_instance-------------------------------------- | |
2842 // This routine takes a klass_node which may be constant (for a static type) | |
2843 // or may be non-constant (for reflective code). It will work equally well | |
2844 // for either, and the graph will fold nicely if the optimizer later reduces | |
2845 // the type to a constant. | |
2846 // The optional arguments are for specialized use by intrinsics: | |
2847 // - If 'extra_slow_test' if not null is an extra condition for the slow-path. | |
2848 // - If 'raw_mem_only', do not cast the result to an oop. | |
2849 // - If 'return_size_val', report the the total object size to the caller. | |
2850 Node* GraphKit::new_instance(Node* klass_node, | |
2851 Node* extra_slow_test, | |
2852 bool raw_mem_only, // affect only raw memory | |
2853 Node* *return_size_val) { | |
2854 // Compute size in doublewords | |
2855 // The size is always an integral number of doublewords, represented | |
2856 // as a positive bytewise size stored in the klass's layout_helper. | |
2857 // The layout_helper also encodes (in a low bit) the need for a slow path. | |
2858 jint layout_con = Klass::_lh_neutral_value; | |
2859 Node* layout_val = get_layout_helper(klass_node, layout_con); | |
2860 int layout_is_con = (layout_val == NULL); | |
2861 | |
2862 if (extra_slow_test == NULL) extra_slow_test = intcon(0); | |
2863 // Generate the initial go-slow test. It's either ALWAYS (return a | |
2864 // Node for 1) or NEVER (return a NULL) or perhaps (in the reflective | |
2865 // case) a computed value derived from the layout_helper. | |
2866 Node* initial_slow_test = NULL; | |
2867 if (layout_is_con) { | |
2868 assert(!StressReflectiveCode, "stress mode does not use these paths"); | |
2869 bool must_go_slow = Klass::layout_helper_needs_slow_path(layout_con); | |
2870 initial_slow_test = must_go_slow? intcon(1): extra_slow_test; | |
2871 | |
2872 } else { // reflective case | |
2873 // This reflective path is used by Unsafe.allocateInstance. | |
2874 // (It may be stress-tested by specifying StressReflectiveCode.) | |
2875 // Basically, we want to get into the VM is there's an illegal argument. | |
2876 Node* bit = intcon(Klass::_lh_instance_slow_path_bit); | |
2877 initial_slow_test = _gvn.transform( new (C, 3) AndINode(layout_val, bit) ); | |
2878 if (extra_slow_test != intcon(0)) { | |
2879 initial_slow_test = _gvn.transform( new (C, 3) OrINode(initial_slow_test, extra_slow_test) ); | |
2880 } | |
2881 // (Macro-expander will further convert this to a Bool, if necessary.) | |
2882 } | |
2883 | |
2884 // Find the size in bytes. This is easy; it's the layout_helper. | |
2885 // The size value must be valid even if the slow path is taken. | |
2886 Node* size = NULL; | |
2887 if (layout_is_con) { | |
2888 size = MakeConX(Klass::layout_helper_size_in_bytes(layout_con)); | |
2889 } else { // reflective case | |
2890 // This reflective path is used by clone and Unsafe.allocateInstance. | |
2891 size = ConvI2X(layout_val); | |
2892 | |
2893 // Clear the low bits to extract layout_helper_size_in_bytes: | |
2894 assert((int)Klass::_lh_instance_slow_path_bit < BytesPerLong, "clear bit"); | |
2895 Node* mask = MakeConX(~ (intptr_t)right_n_bits(LogBytesPerLong)); | |
2896 size = _gvn.transform( new (C, 3) AndXNode(size, mask) ); | |
2897 } | |
2898 if (return_size_val != NULL) { | |
2899 (*return_size_val) = size; | |
2900 } | |
2901 | |
2902 // This is a precise notnull oop of the klass. | |
2903 // (Actually, it need not be precise if this is a reflective allocation.) | |
2904 // It's what we cast the result to. | |
2905 const TypeKlassPtr* tklass = _gvn.type(klass_node)->isa_klassptr(); | |
2906 if (!tklass) tklass = TypeKlassPtr::OBJECT; | |
2907 const TypeOopPtr* oop_type = tklass->as_instance_type(); | |
2908 | |
2909 // Now generate allocation code | |
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2910 |
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2911 // The entire memory state is needed for slow path of the allocation |
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2912 // since GC and deoptimization can happened. |
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2913 Node *mem = reset_memory(); |
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2914 set_all_memory(mem); // Create new memory state |
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2915 |
0 | 2916 AllocateNode* alloc |
2917 = new (C, AllocateNode::ParmLimit) | |
2918 AllocateNode(C, AllocateNode::alloc_type(), | |
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2919 control(), mem, i_o(), |
0 | 2920 size, klass_node, |
2921 initial_slow_test); | |
2922 | |
2923 return set_output_for_allocation(alloc, oop_type, raw_mem_only); | |
2924 } | |
2925 | |
2926 //-------------------------------new_array------------------------------------- | |
2927 // helper for both newarray and anewarray | |
2928 // The 'length' parameter is (obviously) the length of the array. | |
2929 // See comments on new_instance for the meaning of the other arguments. | |
2930 Node* GraphKit::new_array(Node* klass_node, // array klass (maybe variable) | |
2931 Node* length, // number of array elements | |
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2932 int nargs, // number of arguments to push back for uncommon trap |
0 | 2933 bool raw_mem_only, // affect only raw memory |
2934 Node* *return_size_val) { | |
2935 jint layout_con = Klass::_lh_neutral_value; | |
2936 Node* layout_val = get_layout_helper(klass_node, layout_con); | |
2937 int layout_is_con = (layout_val == NULL); | |
2938 | |
2939 if (!layout_is_con && !StressReflectiveCode && | |
2940 !too_many_traps(Deoptimization::Reason_class_check)) { | |
2941 // This is a reflective array creation site. | |
2942 // Optimistically assume that it is a subtype of Object[], | |
2943 // so that we can fold up all the address arithmetic. | |
2944 layout_con = Klass::array_layout_helper(T_OBJECT); | |
2945 Node* cmp_lh = _gvn.transform( new(C, 3) CmpINode(layout_val, intcon(layout_con)) ); | |
2946 Node* bol_lh = _gvn.transform( new(C, 2) BoolNode(cmp_lh, BoolTest::eq) ); | |
2947 { BuildCutout unless(this, bol_lh, PROB_MAX); | |
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2948 _sp += nargs; |
0 | 2949 uncommon_trap(Deoptimization::Reason_class_check, |
2950 Deoptimization::Action_maybe_recompile); | |
2951 } | |
2952 layout_val = NULL; | |
2953 layout_is_con = true; | |
2954 } | |
2955 | |
2956 // Generate the initial go-slow test. Make sure we do not overflow | |
2957 // if length is huge (near 2Gig) or negative! We do not need | |
2958 // exact double-words here, just a close approximation of needed | |
2959 // double-words. We can't add any offset or rounding bits, lest we | |
2960 // take a size -1 of bytes and make it positive. Use an unsigned | |
2961 // compare, so negative sizes look hugely positive. | |
2962 int fast_size_limit = FastAllocateSizeLimit; | |
2963 if (layout_is_con) { | |
2964 assert(!StressReflectiveCode, "stress mode does not use these paths"); | |
2965 // Increase the size limit if we have exact knowledge of array type. | |
2966 int log2_esize = Klass::layout_helper_log2_element_size(layout_con); | |
2967 fast_size_limit <<= (LogBytesPerLong - log2_esize); | |
2968 } | |
2969 | |
2970 Node* initial_slow_cmp = _gvn.transform( new (C, 3) CmpUNode( length, intcon( fast_size_limit ) ) ); | |
2971 Node* initial_slow_test = _gvn.transform( new (C, 2) BoolNode( initial_slow_cmp, BoolTest::gt ) ); | |
2972 if (initial_slow_test->is_Bool()) { | |
2973 // Hide it behind a CMoveI, or else PhaseIdealLoop::split_up will get sick. | |
2974 initial_slow_test = initial_slow_test->as_Bool()->as_int_value(&_gvn); | |
2975 } | |
2976 | |
2977 // --- Size Computation --- | |
2978 // array_size = round_to_heap(array_header + (length << elem_shift)); | |
2979 // where round_to_heap(x) == round_to(x, MinObjAlignmentInBytes) | |
2980 // and round_to(x, y) == ((x + y-1) & ~(y-1)) | |
2981 // The rounding mask is strength-reduced, if possible. | |
2982 int round_mask = MinObjAlignmentInBytes - 1; | |
2983 Node* header_size = NULL; | |
2984 int header_size_min = arrayOopDesc::base_offset_in_bytes(T_BYTE); | |
2985 // (T_BYTE has the weakest alignment and size restrictions...) | |
2986 if (layout_is_con) { | |
2987 int hsize = Klass::layout_helper_header_size(layout_con); | |
2988 int eshift = Klass::layout_helper_log2_element_size(layout_con); | |
2989 BasicType etype = Klass::layout_helper_element_type(layout_con); | |
2990 if ((round_mask & ~right_n_bits(eshift)) == 0) | |
2991 round_mask = 0; // strength-reduce it if it goes away completely | |
2992 assert((hsize & right_n_bits(eshift)) == 0, "hsize is pre-rounded"); | |
2993 assert(header_size_min <= hsize, "generic minimum is smallest"); | |
2994 header_size_min = hsize; | |
2995 header_size = intcon(hsize + round_mask); | |
2996 } else { | |
2997 Node* hss = intcon(Klass::_lh_header_size_shift); | |
2998 Node* hsm = intcon(Klass::_lh_header_size_mask); | |
2999 Node* hsize = _gvn.transform( new(C, 3) URShiftINode(layout_val, hss) ); | |
3000 hsize = _gvn.transform( new(C, 3) AndINode(hsize, hsm) ); | |
3001 Node* mask = intcon(round_mask); | |
3002 header_size = _gvn.transform( new(C, 3) AddINode(hsize, mask) ); | |
3003 } | |
3004 | |
3005 Node* elem_shift = NULL; | |
3006 if (layout_is_con) { | |
3007 int eshift = Klass::layout_helper_log2_element_size(layout_con); | |
3008 if (eshift != 0) | |
3009 elem_shift = intcon(eshift); | |
3010 } else { | |
3011 // There is no need to mask or shift this value. | |
3012 // The semantics of LShiftINode include an implicit mask to 0x1F. | |
3013 assert(Klass::_lh_log2_element_size_shift == 0, "use shift in place"); | |
3014 elem_shift = layout_val; | |
3015 } | |
3016 | |
3017 // Transition to native address size for all offset calculations: | |
3018 Node* lengthx = ConvI2X(length); | |
3019 Node* headerx = ConvI2X(header_size); | |
3020 #ifdef _LP64 | |
3021 { const TypeLong* tllen = _gvn.find_long_type(lengthx); | |
3022 if (tllen != NULL && tllen->_lo < 0) { | |
3023 // Add a manual constraint to a positive range. Cf. array_element_address. | |
3024 jlong size_max = arrayOopDesc::max_array_length(T_BYTE); | |
3025 if (size_max > tllen->_hi) size_max = tllen->_hi; | |
3026 const TypeLong* tlcon = TypeLong::make(CONST64(0), size_max, Type::WidenMin); | |
3027 lengthx = _gvn.transform( new (C, 2) ConvI2LNode(length, tlcon)); | |
3028 } | |
3029 } | |
3030 #endif | |
3031 | |
3032 // Combine header size (plus rounding) and body size. Then round down. | |
3033 // This computation cannot overflow, because it is used only in two | |
3034 // places, one where the length is sharply limited, and the other | |
3035 // after a successful allocation. | |
3036 Node* abody = lengthx; | |
3037 if (elem_shift != NULL) | |
3038 abody = _gvn.transform( new(C, 3) LShiftXNode(lengthx, elem_shift) ); | |
3039 Node* size = _gvn.transform( new(C, 3) AddXNode(headerx, abody) ); | |
3040 if (round_mask != 0) { | |
3041 Node* mask = MakeConX(~round_mask); | |
3042 size = _gvn.transform( new(C, 3) AndXNode(size, mask) ); | |
3043 } | |
3044 // else if round_mask == 0, the size computation is self-rounding | |
3045 | |
3046 if (return_size_val != NULL) { | |
3047 // This is the size | |
3048 (*return_size_val) = size; | |
3049 } | |
3050 | |
3051 // Now generate allocation code | |
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3052 |
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3053 // The entire memory state is needed for slow path of the allocation |
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3054 // since GC and deoptimization can happened. |
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3055 Node *mem = reset_memory(); |
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3056 set_all_memory(mem); // Create new memory state |
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3057 |
0 | 3058 // Create the AllocateArrayNode and its result projections |
3059 AllocateArrayNode* alloc | |
3060 = new (C, AllocateArrayNode::ParmLimit) | |
3061 AllocateArrayNode(C, AllocateArrayNode::alloc_type(), | |
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3062 control(), mem, i_o(), |
0 | 3063 size, klass_node, |
3064 initial_slow_test, | |
3065 length); | |
3066 | |
3067 // Cast to correct type. Note that the klass_node may be constant or not, | |
3068 // and in the latter case the actual array type will be inexact also. | |
3069 // (This happens via a non-constant argument to inline_native_newArray.) | |
3070 // In any case, the value of klass_node provides the desired array type. | |
3071 const TypeInt* length_type = _gvn.find_int_type(length); | |
3072 const TypeOopPtr* ary_type = _gvn.type(klass_node)->is_klassptr()->as_instance_type(); | |
3073 if (ary_type->isa_aryptr() && length_type != NULL) { | |
3074 // Try to get a better type than POS for the size | |
3075 ary_type = ary_type->is_aryptr()->cast_to_size(length_type); | |
3076 } | |
3077 | |
3078 Node* javaoop = set_output_for_allocation(alloc, ary_type, raw_mem_only); | |
3079 | |
366
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3080 // Cast length on remaining path to be as narrow as possible |
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3081 if (map()->find_edge(length) >= 0) { |
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3082 Node* ccast = alloc->make_ideal_length(ary_type, &_gvn); |
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3083 if (ccast != length) { |
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3084 _gvn.set_type_bottom(ccast); |
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3085 record_for_igvn(ccast); |
0 | 3086 replace_in_map(length, ccast); |
3087 } | |
3088 } | |
3089 | |
3090 return javaoop; | |
3091 } | |
3092 | |
3093 // The following "Ideal_foo" functions are placed here because they recognize | |
3094 // the graph shapes created by the functions immediately above. | |
3095 | |
3096 //---------------------------Ideal_allocation---------------------------------- | |
3097 // Given an oop pointer or raw pointer, see if it feeds from an AllocateNode. | |
3098 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase) { | |
3099 if (ptr == NULL) { // reduce dumb test in callers | |
3100 return NULL; | |
3101 } | |
3102 if (ptr->is_CheckCastPP()) { // strip a raw-to-oop cast | |
3103 ptr = ptr->in(1); | |
3104 if (ptr == NULL) return NULL; | |
3105 } | |
3106 if (ptr->is_Proj()) { | |
3107 Node* allo = ptr->in(0); | |
3108 if (allo != NULL && allo->is_Allocate()) { | |
3109 return allo->as_Allocate(); | |
3110 } | |
3111 } | |
3112 // Report failure to match. | |
3113 return NULL; | |
3114 } | |
3115 | |
3116 // Fancy version which also strips off an offset (and reports it to caller). | |
3117 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase, | |
3118 intptr_t& offset) { | |
3119 Node* base = AddPNode::Ideal_base_and_offset(ptr, phase, offset); | |
3120 if (base == NULL) return NULL; | |
3121 return Ideal_allocation(base, phase); | |
3122 } | |
3123 | |
3124 // Trace Initialize <- Proj[Parm] <- Allocate | |
3125 AllocateNode* InitializeNode::allocation() { | |
3126 Node* rawoop = in(InitializeNode::RawAddress); | |
3127 if (rawoop->is_Proj()) { | |
3128 Node* alloc = rawoop->in(0); | |
3129 if (alloc->is_Allocate()) { | |
3130 return alloc->as_Allocate(); | |
3131 } | |
3132 } | |
3133 return NULL; | |
3134 } | |
3135 | |
3136 // Trace Allocate -> Proj[Parm] -> Initialize | |
3137 InitializeNode* AllocateNode::initialization() { | |
3138 ProjNode* rawoop = proj_out(AllocateNode::RawAddress); | |
3139 if (rawoop == NULL) return NULL; | |
3140 for (DUIterator_Fast imax, i = rawoop->fast_outs(imax); i < imax; i++) { | |
3141 Node* init = rawoop->fast_out(i); | |
3142 if (init->is_Initialize()) { | |
3143 assert(init->as_Initialize()->allocation() == this, "2-way link"); | |
3144 return init->as_Initialize(); | |
3145 } | |
3146 } | |
3147 return NULL; | |
3148 } | |
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3149 |
851
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3150 //----------------------------- store barriers ---------------------------- |
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3151 #define __ ideal. |
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3152 |
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3153 void GraphKit::sync_kit(IdealKit& ideal) { |
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3154 // Final sync IdealKit and graphKit. |
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3155 __ drain_delay_transform(); |
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3156 set_all_memory(__ merged_memory()); |
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3157 set_control(__ ctrl()); |
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3158 } |
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3159 |
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3160 // vanilla/CMS post barrier |
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3161 // Insert a write-barrier store. This is to let generational GC work; we have |
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3162 // to flag all oop-stores before the next GC point. |
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3163 void GraphKit::write_barrier_post(Node* oop_store, |
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3164 Node* obj, |
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3165 Node* adr, |
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3166 Node* val, |
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3167 bool use_precise) { |
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3168 // No store check needed if we're storing a NULL or an old object |
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3169 // (latter case is probably a string constant). The concurrent |
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3170 // mark sweep garbage collector, however, needs to have all nonNull |
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3171 // oop updates flagged via card-marks. |
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3172 if (val != NULL && val->is_Con()) { |
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3173 // must be either an oop or NULL |
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3174 const Type* t = val->bottom_type(); |
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3175 if (t == TypePtr::NULL_PTR || t == Type::TOP) |
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3176 // stores of null never (?) need barriers |
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3177 return; |
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3178 ciObject* con = t->is_oopptr()->const_oop(); |
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3179 if (con != NULL |
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3180 && con->is_perm() |
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3181 && Universe::heap()->can_elide_permanent_oop_store_barriers()) |
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3182 // no store barrier needed, because no old-to-new ref created |
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3183 return; |
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3184 } |
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3185 |
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3186 if (!use_precise) { |
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3187 // All card marks for a (non-array) instance are in one place: |
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3188 adr = obj; |
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3189 } |
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3190 // (Else it's an array (or unknown), and we want more precise card marks.) |
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3191 assert(adr != NULL, ""); |
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3192 |
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3193 IdealKit ideal(gvn(), control(), merged_memory(), true); |
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3194 |
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3195 // Convert the pointer to an int prior to doing math on it |
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3196 Node* cast = __ CastPX(__ ctrl(), adr); |
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3197 |
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3198 // Divide by card size |
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3199 assert(Universe::heap()->barrier_set()->kind() == BarrierSet::CardTableModRef, |
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3200 "Only one we handle so far."); |
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3201 Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) ); |
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3202 |
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3203 // Combine card table base and card offset |
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3204 Node* card_adr = __ AddP(__ top(), byte_map_base_node(), card_offset ); |
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3205 |
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3206 // Get the alias_index for raw card-mark memory |
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3207 int adr_type = Compile::AliasIdxRaw; |
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3208 // Smash zero into card |
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3209 Node* zero = __ ConI(0); |
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3210 BasicType bt = T_BYTE; |
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3211 if( !UseConcMarkSweepGC ) { |
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3212 __ store(__ ctrl(), card_adr, zero, bt, adr_type); |
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3213 } else { |
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3214 // Specialized path for CM store barrier |
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3215 __ storeCM(__ ctrl(), card_adr, zero, oop_store, bt, adr_type); |
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3216 } |
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3217 |
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3218 // Final sync IdealKit and GraphKit. |
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3219 sync_kit(ideal); |
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3220 } |
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3221 |
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3222 // G1 pre/post barriers |
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3223 void GraphKit::g1_write_barrier_pre(Node* obj, |
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3224 Node* adr, |
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3225 uint alias_idx, |
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3226 Node* val, |
825 | 3227 const TypeOopPtr* val_type, |
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3228 BasicType bt) { |
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3229 IdealKit ideal(gvn(), control(), merged_memory(), true); |
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3230 |
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3231 Node* tls = __ thread(); // ThreadLocalStorage |
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3232 |
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3233 Node* no_ctrl = NULL; |
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3234 Node* no_base = __ top(); |
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3235 Node* zero = __ ConI(0); |
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3236 |
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3237 float likely = PROB_LIKELY(0.999); |
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3238 float unlikely = PROB_UNLIKELY(0.999); |
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3239 |
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3240 BasicType active_type = in_bytes(PtrQueue::byte_width_of_active()) == 4 ? T_INT : T_BYTE; |
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3241 assert(in_bytes(PtrQueue::byte_width_of_active()) == 4 || in_bytes(PtrQueue::byte_width_of_active()) == 1, "flag width"); |
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3242 |
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3243 // Offsets into the thread |
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3244 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 648 |
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3245 PtrQueue::byte_offset_of_active()); |
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3246 const int index_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 656 |
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3247 PtrQueue::byte_offset_of_index()); |
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3248 const int buffer_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 652 |
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3249 PtrQueue::byte_offset_of_buf()); |
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3250 // Now the actual pointers into the thread |
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3251 |
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3252 // set_control( ctl); |
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3253 |
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3254 Node* marking_adr = __ AddP(no_base, tls, __ ConX(marking_offset)); |
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3255 Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset)); |
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3256 Node* index_adr = __ AddP(no_base, tls, __ ConX(index_offset)); |
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3257 |
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3258 // Now some of the values |
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3259 |
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3260 Node* marking = __ load(__ ctrl(), marking_adr, TypeInt::INT, active_type, Compile::AliasIdxRaw); |
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3261 |
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3262 // if (!marking) |
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3263 __ if_then(marking, BoolTest::ne, zero); { |
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3264 Node* index = __ load(__ ctrl(), index_adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw); |
342
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3265 |
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3266 const Type* t1 = adr->bottom_type(); |
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3267 const Type* t2 = val->bottom_type(); |
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3268 |
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3269 Node* orig = __ load(no_ctrl, adr, val_type, bt, alias_idx); |
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3270 // if (orig != NULL) |
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3271 __ if_then(orig, BoolTest::ne, null()); { |
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3272 Node* buffer = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw); |
342
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3273 |
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3274 // load original value |
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3275 // alias_idx correct?? |
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3276 |
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3277 // is the queue for this thread full? |
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3278 __ if_then(index, BoolTest::ne, zero, likely); { |
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3279 |
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3280 // decrement the index |
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3281 Node* next_index = __ SubI(index, __ ConI(sizeof(intptr_t))); |
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3282 Node* next_indexX = next_index; |
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3283 #ifdef _LP64 |
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3284 // We could refine the type for what it's worth |
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3285 // const TypeLong* lidxtype = TypeLong::make(CONST64(0), get_size_from_queue); |
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3286 next_indexX = _gvn.transform( new (C, 2) ConvI2LNode(next_index, TypeLong::make(0, max_jlong, Type::WidenMax)) ); |
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3287 #endif |
342
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3288 |
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3289 // Now get the buffer location we will log the original value into and store it |
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3290 Node *log_addr = __ AddP(no_base, buffer, next_indexX); |
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3291 __ store(__ ctrl(), log_addr, orig, T_OBJECT, Compile::AliasIdxRaw); |
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3292 |
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3293 // update the index |
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3294 __ store(__ ctrl(), index_adr, next_index, T_INT, Compile::AliasIdxRaw); |
342
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3295 |
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3296 } __ else_(); { |
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|
3297 |
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3298 // logging buffer is full, call the runtime |
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3299 const TypeFunc *tf = OptoRuntime::g1_wb_pre_Type(); |
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3300 __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), "g1_wb_pre", orig, tls); |
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3301 } __ end_if(); // (!index) |
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3302 } __ end_if(); // (orig != NULL) |
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3303 } __ end_if(); // (!marking) |
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3304 |
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3305 // Final sync IdealKit and GraphKit. |
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3306 sync_kit(ideal); |
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3307 } |
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3308 |
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3309 // |
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3310 // Update the card table and add card address to the queue |
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3311 // |
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3312 void GraphKit::g1_mark_card(IdealKit& ideal, |
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3313 Node* card_adr, |
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3314 Node* oop_store, |
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3315 Node* index, |
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3316 Node* index_adr, |
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3317 Node* buffer, |
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3318 const TypeFunc* tf) { |
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3319 |
342
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3320 Node* zero = __ ConI(0); |
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3321 Node* no_base = __ top(); |
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3322 BasicType card_bt = T_BYTE; |
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3323 // Smash zero into card. MUST BE ORDERED WRT TO STORE |
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3324 __ storeCM(__ ctrl(), card_adr, zero, oop_store, card_bt, Compile::AliasIdxRaw); |
342
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3325 |
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3326 // Now do the queue work |
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3327 __ if_then(index, BoolTest::ne, zero); { |
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3328 |
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3329 Node* next_index = __ SubI(index, __ ConI(sizeof(intptr_t))); |
342
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3330 Node* next_indexX = next_index; |
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3331 #ifdef _LP64 |
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3332 // We could refine the type for what it's worth |
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3333 // const TypeLong* lidxtype = TypeLong::make(CONST64(0), get_size_from_queue); |
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3334 next_indexX = _gvn.transform( new (C, 2) ConvI2LNode(next_index, TypeLong::make(0, max_jlong, Type::WidenMax)) ); |
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3335 #endif // _LP64 |
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3336 Node* log_addr = __ AddP(no_base, buffer, next_indexX); |
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3337 |
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3338 __ store(__ ctrl(), log_addr, card_adr, T_ADDRESS, Compile::AliasIdxRaw); |
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3339 __ store(__ ctrl(), index_adr, next_index, T_INT, Compile::AliasIdxRaw); |
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3340 |
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3341 } __ else_(); { |
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3342 __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), "g1_wb_post", card_adr, __ thread()); |
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3343 } __ end_if(); |
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3344 |
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3345 } |
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3346 |
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3347 void GraphKit::g1_write_barrier_post(Node* oop_store, |
342
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3348 Node* obj, |
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3349 Node* adr, |
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3350 uint alias_idx, |
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3351 Node* val, |
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3352 BasicType bt, |
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3353 bool use_precise) { |
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3354 // If we are writing a NULL then we need no post barrier |
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3355 |
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3356 if (val != NULL && val->is_Con() && val->bottom_type() == TypePtr::NULL_PTR) { |
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3357 // Must be NULL |
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3358 const Type* t = val->bottom_type(); |
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3359 assert(t == Type::TOP || t == TypePtr::NULL_PTR, "must be NULL"); |
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3360 // No post barrier if writing NULLx |
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3361 return; |
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3362 } |
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3363 |
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3364 if (!use_precise) { |
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3365 // All card marks for a (non-array) instance are in one place: |
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3366 adr = obj; |
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3367 } |
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3368 // (Else it's an array (or unknown), and we want more precise card marks.) |
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3369 assert(adr != NULL, ""); |
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3370 |
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3371 IdealKit ideal(gvn(), control(), merged_memory(), true); |
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3372 |
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3373 Node* tls = __ thread(); // ThreadLocalStorage |
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3374 |
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3375 Node* no_ctrl = NULL; |
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3376 Node* no_base = __ top(); |
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3377 float likely = PROB_LIKELY(0.999); |
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3378 float unlikely = PROB_UNLIKELY(0.999); |
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3379 Node* zero = __ ConI(0); |
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3380 Node* zeroX = __ ConX(0); |
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3381 |
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3382 // Get the alias_index for raw card-mark memory |
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3383 const TypePtr* card_type = TypeRawPtr::BOTTOM; |
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3384 |
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3385 const TypeFunc *tf = OptoRuntime::g1_wb_post_Type(); |
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3386 |
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3387 // Offsets into the thread |
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3388 const int index_offset = in_bytes(JavaThread::dirty_card_queue_offset() + |
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3389 PtrQueue::byte_offset_of_index()); |
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3390 const int buffer_offset = in_bytes(JavaThread::dirty_card_queue_offset() + |
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3391 PtrQueue::byte_offset_of_buf()); |
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3392 |
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3393 // Pointers into the thread |
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3394 |
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3395 Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset)); |
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3396 Node* index_adr = __ AddP(no_base, tls, __ ConX(index_offset)); |
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3397 |
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3398 // Now some values |
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3399 |
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3400 Node* index = __ load(no_ctrl, index_adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw); |
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3401 Node* buffer = __ load(no_ctrl, buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw); |
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3402 |
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3403 |
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3404 // Convert the store obj pointer to an int prior to doing math on it |
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3405 // Must use ctrl to prevent "integerized oop" existing across safepoint |
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3406 Node* cast = __ CastPX(__ ctrl(), adr); |
342
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3407 |
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3408 // Divide pointer by card size |
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3409 Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) ); |
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3410 |
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3411 // Combine card table base and card offset |
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3412 Node* card_adr = __ AddP(no_base, byte_map_base_node(), card_offset ); |
342
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3413 |
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3414 // If we know the value being stored does it cross regions? |
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3415 |
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3416 if (val != NULL) { |
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3417 // Does the store cause us to cross regions? |
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3418 |
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3419 // Should be able to do an unsigned compare of region_size instead of |
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3420 // and extra shift. Do we have an unsigned compare?? |
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3421 // Node* region_size = __ ConI(1 << HeapRegion::LogOfHRGrainBytes); |
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3422 Node* xor_res = __ URShiftX ( __ XorX( cast, __ CastPX(__ ctrl(), val)), __ ConI(HeapRegion::LogOfHRGrainBytes)); |
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3423 |
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3424 // if (xor_res == 0) same region so skip |
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3425 __ if_then(xor_res, BoolTest::ne, zeroX); { |
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3426 |
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3427 // No barrier if we are storing a NULL |
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3428 __ if_then(val, BoolTest::ne, null(), unlikely); { |
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3429 |
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3430 // Ok must mark the card if not already dirty |
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3431 |
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3432 // load the original value of the card |
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3433 Node* card_val = __ load(__ ctrl(), card_adr, TypeInt::INT, T_BYTE, Compile::AliasIdxRaw); |
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3434 |
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3435 __ if_then(card_val, BoolTest::ne, zero); { |
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3436 g1_mark_card(ideal, card_adr, oop_store, index, index_adr, buffer, tf); |
342
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3437 } __ end_if(); |
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3438 } __ end_if(); |
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3439 } __ end_if(); |
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3440 } else { |
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3441 // Object.clone() instrinsic uses this path. |
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3442 g1_mark_card(ideal, card_adr, oop_store, index, index_adr, buffer, tf); |
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3443 } |
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3444 |
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3445 // Final sync IdealKit and GraphKit. |
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3446 sync_kit(ideal); |
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3447 } |
342
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3448 #undef __ |
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3449 |