Mercurial > hg > truffle
annotate src/share/vm/opto/graphKit.cpp @ 7287:76c9023ed438
Remove now useless prefix arguments for jtt unittests
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 20 Dec 2012 17:06:59 +0100 |
parents | 2aff40cb4703 |
children | ad5dd04754ee |
rev | line source |
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0 | 1 /* |
6057 | 2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "compiler/compileLog.hpp" | |
27 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" | |
28 #include "gc_implementation/g1/heapRegion.hpp" | |
29 #include "gc_interface/collectedHeap.hpp" | |
30 #include "memory/barrierSet.hpp" | |
31 #include "memory/cardTableModRefBS.hpp" | |
32 #include "opto/addnode.hpp" | |
33 #include "opto/graphKit.hpp" | |
34 #include "opto/idealKit.hpp" | |
35 #include "opto/locknode.hpp" | |
36 #include "opto/machnode.hpp" | |
37 #include "opto/parse.hpp" | |
38 #include "opto/rootnode.hpp" | |
39 #include "opto/runtime.hpp" | |
40 #include "runtime/deoptimization.hpp" | |
41 #include "runtime/sharedRuntime.hpp" | |
0 | 42 |
43 //----------------------------GraphKit----------------------------------------- | |
44 // Main utility constructor. | |
45 GraphKit::GraphKit(JVMState* jvms) | |
46 : Phase(Phase::Parser), | |
47 _env(C->env()), | |
48 _gvn(*C->initial_gvn()) | |
49 { | |
50 _exceptions = jvms->map()->next_exception(); | |
51 if (_exceptions != NULL) jvms->map()->set_next_exception(NULL); | |
52 set_jvms(jvms); | |
53 } | |
54 | |
55 // Private constructor for parser. | |
56 GraphKit::GraphKit() | |
57 : Phase(Phase::Parser), | |
58 _env(C->env()), | |
59 _gvn(*C->initial_gvn()) | |
60 { | |
61 _exceptions = NULL; | |
62 set_map(NULL); | |
63 debug_only(_sp = -99); | |
64 debug_only(set_bci(-99)); | |
65 } | |
66 | |
67 | |
68 | |
69 //---------------------------clean_stack--------------------------------------- | |
70 // Clear away rubbish from the stack area of the JVM state. | |
71 // This destroys any arguments that may be waiting on the stack. | |
72 void GraphKit::clean_stack(int from_sp) { | |
73 SafePointNode* map = this->map(); | |
74 JVMState* jvms = this->jvms(); | |
75 int stk_size = jvms->stk_size(); | |
76 int stkoff = jvms->stkoff(); | |
77 Node* top = this->top(); | |
78 for (int i = from_sp; i < stk_size; i++) { | |
79 if (map->in(stkoff + i) != top) { | |
80 map->set_req(stkoff + i, top); | |
81 } | |
82 } | |
83 } | |
84 | |
85 | |
86 //--------------------------------sync_jvms----------------------------------- | |
87 // Make sure our current jvms agrees with our parse state. | |
88 JVMState* GraphKit::sync_jvms() const { | |
89 JVMState* jvms = this->jvms(); | |
90 jvms->set_bci(bci()); // Record the new bci in the JVMState | |
91 jvms->set_sp(sp()); // Record the new sp in the JVMState | |
92 assert(jvms_in_sync(), "jvms is now in sync"); | |
93 return jvms; | |
94 } | |
95 | |
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96 //--------------------------------sync_jvms_for_reexecute--------------------- |
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97 // Make sure our current jvms agrees with our parse state. This version |
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98 // uses the reexecute_sp for reexecuting bytecodes. |
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99 JVMState* GraphKit::sync_jvms_for_reexecute() { |
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100 JVMState* jvms = this->jvms(); |
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101 jvms->set_bci(bci()); // Record the new bci in the JVMState |
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102 jvms->set_sp(reexecute_sp()); // Record the new sp in the JVMState |
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103 return jvms; |
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104 } |
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105 |
0 | 106 #ifdef ASSERT |
107 bool GraphKit::jvms_in_sync() const { | |
108 Parse* parse = is_Parse(); | |
109 if (parse == NULL) { | |
110 if (bci() != jvms()->bci()) return false; | |
111 if (sp() != (int)jvms()->sp()) return false; | |
112 return true; | |
113 } | |
114 if (jvms()->method() != parse->method()) return false; | |
115 if (jvms()->bci() != parse->bci()) return false; | |
116 int jvms_sp = jvms()->sp(); | |
117 if (jvms_sp != parse->sp()) return false; | |
118 int jvms_depth = jvms()->depth(); | |
119 if (jvms_depth != parse->depth()) return false; | |
120 return true; | |
121 } | |
122 | |
123 // Local helper checks for special internal merge points | |
124 // used to accumulate and merge exception states. | |
125 // They are marked by the region's in(0) edge being the map itself. | |
126 // Such merge points must never "escape" into the parser at large, | |
127 // until they have been handed to gvn.transform. | |
128 static bool is_hidden_merge(Node* reg) { | |
129 if (reg == NULL) return false; | |
130 if (reg->is_Phi()) { | |
131 reg = reg->in(0); | |
132 if (reg == NULL) return false; | |
133 } | |
134 return reg->is_Region() && reg->in(0) != NULL && reg->in(0)->is_Root(); | |
135 } | |
136 | |
137 void GraphKit::verify_map() const { | |
138 if (map() == NULL) return; // null map is OK | |
139 assert(map()->req() <= jvms()->endoff(), "no extra garbage on map"); | |
140 assert(!map()->has_exceptions(), "call add_exception_states_from 1st"); | |
141 assert(!is_hidden_merge(control()), "call use_exception_state, not set_map"); | |
142 } | |
143 | |
144 void GraphKit::verify_exception_state(SafePointNode* ex_map) { | |
145 assert(ex_map->next_exception() == NULL, "not already part of a chain"); | |
146 assert(has_saved_ex_oop(ex_map), "every exception state has an ex_oop"); | |
147 } | |
148 #endif | |
149 | |
150 //---------------------------stop_and_kill_map--------------------------------- | |
151 // Set _map to NULL, signalling a stop to further bytecode execution. | |
152 // First smash the current map's control to a constant, to mark it dead. | |
153 void GraphKit::stop_and_kill_map() { | |
154 SafePointNode* dead_map = stop(); | |
155 if (dead_map != NULL) { | |
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156 dead_map->disconnect_inputs(NULL, C); // Mark the map as killed. |
0 | 157 assert(dead_map->is_killed(), "must be so marked"); |
158 } | |
159 } | |
160 | |
161 | |
162 //--------------------------------stopped-------------------------------------- | |
163 // Tell if _map is NULL, or control is top. | |
164 bool GraphKit::stopped() { | |
165 if (map() == NULL) return true; | |
166 else if (control() == top()) return true; | |
167 else return false; | |
168 } | |
169 | |
170 | |
171 //-----------------------------has_ex_handler---------------------------------- | |
172 // Tell if this method or any caller method has exception handlers. | |
173 bool GraphKit::has_ex_handler() { | |
174 for (JVMState* jvmsp = jvms(); jvmsp != NULL; jvmsp = jvmsp->caller()) { | |
175 if (jvmsp->has_method() && jvmsp->method()->has_exception_handlers()) { | |
176 return true; | |
177 } | |
178 } | |
179 return false; | |
180 } | |
181 | |
182 //------------------------------save_ex_oop------------------------------------ | |
183 // Save an exception without blowing stack contents or other JVM state. | |
184 void GraphKit::set_saved_ex_oop(SafePointNode* ex_map, Node* ex_oop) { | |
185 assert(!has_saved_ex_oop(ex_map), "clear ex-oop before setting again"); | |
186 ex_map->add_req(ex_oop); | |
187 debug_only(verify_exception_state(ex_map)); | |
188 } | |
189 | |
190 inline static Node* common_saved_ex_oop(SafePointNode* ex_map, bool clear_it) { | |
191 assert(GraphKit::has_saved_ex_oop(ex_map), "ex_oop must be there"); | |
192 Node* ex_oop = ex_map->in(ex_map->req()-1); | |
193 if (clear_it) ex_map->del_req(ex_map->req()-1); | |
194 return ex_oop; | |
195 } | |
196 | |
197 //-----------------------------saved_ex_oop------------------------------------ | |
198 // Recover a saved exception from its map. | |
199 Node* GraphKit::saved_ex_oop(SafePointNode* ex_map) { | |
200 return common_saved_ex_oop(ex_map, false); | |
201 } | |
202 | |
203 //--------------------------clear_saved_ex_oop--------------------------------- | |
204 // Erase a previously saved exception from its map. | |
205 Node* GraphKit::clear_saved_ex_oop(SafePointNode* ex_map) { | |
206 return common_saved_ex_oop(ex_map, true); | |
207 } | |
208 | |
209 #ifdef ASSERT | |
210 //---------------------------has_saved_ex_oop---------------------------------- | |
211 // Erase a previously saved exception from its map. | |
212 bool GraphKit::has_saved_ex_oop(SafePointNode* ex_map) { | |
213 return ex_map->req() == ex_map->jvms()->endoff()+1; | |
214 } | |
215 #endif | |
216 | |
217 //-------------------------make_exception_state-------------------------------- | |
218 // Turn the current JVM state into an exception state, appending the ex_oop. | |
219 SafePointNode* GraphKit::make_exception_state(Node* ex_oop) { | |
220 sync_jvms(); | |
221 SafePointNode* ex_map = stop(); // do not manipulate this map any more | |
222 set_saved_ex_oop(ex_map, ex_oop); | |
223 return ex_map; | |
224 } | |
225 | |
226 | |
227 //--------------------------add_exception_state-------------------------------- | |
228 // Add an exception to my list of exceptions. | |
229 void GraphKit::add_exception_state(SafePointNode* ex_map) { | |
230 if (ex_map == NULL || ex_map->control() == top()) { | |
231 return; | |
232 } | |
233 #ifdef ASSERT | |
234 verify_exception_state(ex_map); | |
235 if (has_exceptions()) { | |
236 assert(ex_map->jvms()->same_calls_as(_exceptions->jvms()), "all collected exceptions must come from the same place"); | |
237 } | |
238 #endif | |
239 | |
240 // If there is already an exception of exactly this type, merge with it. | |
241 // In particular, null-checks and other low-level exceptions common up here. | |
242 Node* ex_oop = saved_ex_oop(ex_map); | |
243 const Type* ex_type = _gvn.type(ex_oop); | |
244 if (ex_oop == top()) { | |
245 // No action needed. | |
246 return; | |
247 } | |
248 assert(ex_type->isa_instptr(), "exception must be an instance"); | |
249 for (SafePointNode* e2 = _exceptions; e2 != NULL; e2 = e2->next_exception()) { | |
250 const Type* ex_type2 = _gvn.type(saved_ex_oop(e2)); | |
251 // We check sp also because call bytecodes can generate exceptions | |
252 // both before and after arguments are popped! | |
253 if (ex_type2 == ex_type | |
254 && e2->_jvms->sp() == ex_map->_jvms->sp()) { | |
255 combine_exception_states(ex_map, e2); | |
256 return; | |
257 } | |
258 } | |
259 | |
260 // No pre-existing exception of the same type. Chain it on the list. | |
261 push_exception_state(ex_map); | |
262 } | |
263 | |
264 //-----------------------add_exception_states_from----------------------------- | |
265 void GraphKit::add_exception_states_from(JVMState* jvms) { | |
266 SafePointNode* ex_map = jvms->map()->next_exception(); | |
267 if (ex_map != NULL) { | |
268 jvms->map()->set_next_exception(NULL); | |
269 for (SafePointNode* next_map; ex_map != NULL; ex_map = next_map) { | |
270 next_map = ex_map->next_exception(); | |
271 ex_map->set_next_exception(NULL); | |
272 add_exception_state(ex_map); | |
273 } | |
274 } | |
275 } | |
276 | |
277 //-----------------------transfer_exceptions_into_jvms------------------------- | |
278 JVMState* GraphKit::transfer_exceptions_into_jvms() { | |
279 if (map() == NULL) { | |
280 // We need a JVMS to carry the exceptions, but the map has gone away. | |
281 // Create a scratch JVMS, cloned from any of the exception states... | |
282 if (has_exceptions()) { | |
283 _map = _exceptions; | |
284 _map = clone_map(); | |
285 _map->set_next_exception(NULL); | |
286 clear_saved_ex_oop(_map); | |
287 debug_only(verify_map()); | |
288 } else { | |
289 // ...or created from scratch | |
290 JVMState* jvms = new (C) JVMState(_method, NULL); | |
291 jvms->set_bci(_bci); | |
292 jvms->set_sp(_sp); | |
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293 jvms->set_map(new (C) SafePointNode(TypeFunc::Parms, jvms)); |
0 | 294 set_jvms(jvms); |
295 for (uint i = 0; i < map()->req(); i++) map()->init_req(i, top()); | |
296 set_all_memory(top()); | |
297 while (map()->req() < jvms->endoff()) map()->add_req(top()); | |
298 } | |
299 // (This is a kludge, in case you didn't notice.) | |
300 set_control(top()); | |
301 } | |
302 JVMState* jvms = sync_jvms(); | |
303 assert(!jvms->map()->has_exceptions(), "no exceptions on this map yet"); | |
304 jvms->map()->set_next_exception(_exceptions); | |
305 _exceptions = NULL; // done with this set of exceptions | |
306 return jvms; | |
307 } | |
308 | |
309 static inline void add_n_reqs(Node* dstphi, Node* srcphi) { | |
310 assert(is_hidden_merge(dstphi), "must be a special merge node"); | |
311 assert(is_hidden_merge(srcphi), "must be a special merge node"); | |
312 uint limit = srcphi->req(); | |
313 for (uint i = PhiNode::Input; i < limit; i++) { | |
314 dstphi->add_req(srcphi->in(i)); | |
315 } | |
316 } | |
317 static inline void add_one_req(Node* dstphi, Node* src) { | |
318 assert(is_hidden_merge(dstphi), "must be a special merge node"); | |
319 assert(!is_hidden_merge(src), "must not be a special merge node"); | |
320 dstphi->add_req(src); | |
321 } | |
322 | |
323 //-----------------------combine_exception_states------------------------------ | |
324 // This helper function combines exception states by building phis on a | |
325 // specially marked state-merging region. These regions and phis are | |
326 // untransformed, and can build up gradually. The region is marked by | |
327 // having a control input of its exception map, rather than NULL. Such | |
328 // regions do not appear except in this function, and in use_exception_state. | |
329 void GraphKit::combine_exception_states(SafePointNode* ex_map, SafePointNode* phi_map) { | |
330 if (failing()) return; // dying anyway... | |
331 JVMState* ex_jvms = ex_map->_jvms; | |
332 assert(ex_jvms->same_calls_as(phi_map->_jvms), "consistent call chains"); | |
333 assert(ex_jvms->stkoff() == phi_map->_jvms->stkoff(), "matching locals"); | |
334 assert(ex_jvms->sp() == phi_map->_jvms->sp(), "matching stack sizes"); | |
335 assert(ex_jvms->monoff() == phi_map->_jvms->monoff(), "matching JVMS"); | |
336 assert(ex_map->req() == phi_map->req(), "matching maps"); | |
337 uint tos = ex_jvms->stkoff() + ex_jvms->sp(); | |
338 Node* hidden_merge_mark = root(); | |
339 Node* region = phi_map->control(); | |
340 MergeMemNode* phi_mem = phi_map->merged_memory(); | |
341 MergeMemNode* ex_mem = ex_map->merged_memory(); | |
342 if (region->in(0) != hidden_merge_mark) { | |
343 // The control input is not (yet) a specially-marked region in phi_map. | |
344 // Make it so, and build some phis. | |
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345 region = new (C) RegionNode(2); |
0 | 346 _gvn.set_type(region, Type::CONTROL); |
347 region->set_req(0, hidden_merge_mark); // marks an internal ex-state | |
348 region->init_req(1, phi_map->control()); | |
349 phi_map->set_control(region); | |
350 Node* io_phi = PhiNode::make(region, phi_map->i_o(), Type::ABIO); | |
351 record_for_igvn(io_phi); | |
352 _gvn.set_type(io_phi, Type::ABIO); | |
353 phi_map->set_i_o(io_phi); | |
354 for (MergeMemStream mms(phi_mem); mms.next_non_empty(); ) { | |
355 Node* m = mms.memory(); | |
356 Node* m_phi = PhiNode::make(region, m, Type::MEMORY, mms.adr_type(C)); | |
357 record_for_igvn(m_phi); | |
358 _gvn.set_type(m_phi, Type::MEMORY); | |
359 mms.set_memory(m_phi); | |
360 } | |
361 } | |
362 | |
363 // Either or both of phi_map and ex_map might already be converted into phis. | |
364 Node* ex_control = ex_map->control(); | |
365 // if there is special marking on ex_map also, we add multiple edges from src | |
366 bool add_multiple = (ex_control->in(0) == hidden_merge_mark); | |
367 // how wide was the destination phi_map, originally? | |
368 uint orig_width = region->req(); | |
369 | |
370 if (add_multiple) { | |
371 add_n_reqs(region, ex_control); | |
372 add_n_reqs(phi_map->i_o(), ex_map->i_o()); | |
373 } else { | |
374 // ex_map has no merges, so we just add single edges everywhere | |
375 add_one_req(region, ex_control); | |
376 add_one_req(phi_map->i_o(), ex_map->i_o()); | |
377 } | |
378 for (MergeMemStream mms(phi_mem, ex_mem); mms.next_non_empty2(); ) { | |
379 if (mms.is_empty()) { | |
380 // get a copy of the base memory, and patch some inputs into it | |
381 const TypePtr* adr_type = mms.adr_type(C); | |
382 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type); | |
383 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), ""); | |
384 mms.set_memory(phi); | |
385 // Prepare to append interesting stuff onto the newly sliced phi: | |
386 while (phi->req() > orig_width) phi->del_req(phi->req()-1); | |
387 } | |
388 // Append stuff from ex_map: | |
389 if (add_multiple) { | |
390 add_n_reqs(mms.memory(), mms.memory2()); | |
391 } else { | |
392 add_one_req(mms.memory(), mms.memory2()); | |
393 } | |
394 } | |
395 uint limit = ex_map->req(); | |
396 for (uint i = TypeFunc::Parms; i < limit; i++) { | |
397 // Skip everything in the JVMS after tos. (The ex_oop follows.) | |
398 if (i == tos) i = ex_jvms->monoff(); | |
399 Node* src = ex_map->in(i); | |
400 Node* dst = phi_map->in(i); | |
401 if (src != dst) { | |
402 PhiNode* phi; | |
403 if (dst->in(0) != region) { | |
404 dst = phi = PhiNode::make(region, dst, _gvn.type(dst)); | |
405 record_for_igvn(phi); | |
406 _gvn.set_type(phi, phi->type()); | |
407 phi_map->set_req(i, dst); | |
408 // Prepare to append interesting stuff onto the new phi: | |
409 while (dst->req() > orig_width) dst->del_req(dst->req()-1); | |
410 } else { | |
411 assert(dst->is_Phi(), "nobody else uses a hidden region"); | |
412 phi = (PhiNode*)dst; | |
413 } | |
414 if (add_multiple && src->in(0) == ex_control) { | |
415 // Both are phis. | |
416 add_n_reqs(dst, src); | |
417 } else { | |
418 while (dst->req() < region->req()) add_one_req(dst, src); | |
419 } | |
420 const Type* srctype = _gvn.type(src); | |
421 if (phi->type() != srctype) { | |
422 const Type* dsttype = phi->type()->meet(srctype); | |
423 if (phi->type() != dsttype) { | |
424 phi->set_type(dsttype); | |
425 _gvn.set_type(phi, dsttype); | |
426 } | |
427 } | |
428 } | |
429 } | |
430 } | |
431 | |
432 //--------------------------use_exception_state-------------------------------- | |
433 Node* GraphKit::use_exception_state(SafePointNode* phi_map) { | |
434 if (failing()) { stop(); return top(); } | |
435 Node* region = phi_map->control(); | |
436 Node* hidden_merge_mark = root(); | |
437 assert(phi_map->jvms()->map() == phi_map, "sanity: 1-1 relation"); | |
438 Node* ex_oop = clear_saved_ex_oop(phi_map); | |
439 if (region->in(0) == hidden_merge_mark) { | |
440 // Special marking for internal ex-states. Process the phis now. | |
441 region->set_req(0, region); // now it's an ordinary region | |
442 set_jvms(phi_map->jvms()); // ...so now we can use it as a map | |
443 // Note: Setting the jvms also sets the bci and sp. | |
444 set_control(_gvn.transform(region)); | |
445 uint tos = jvms()->stkoff() + sp(); | |
446 for (uint i = 1; i < tos; i++) { | |
447 Node* x = phi_map->in(i); | |
448 if (x->in(0) == region) { | |
449 assert(x->is_Phi(), "expected a special phi"); | |
450 phi_map->set_req(i, _gvn.transform(x)); | |
451 } | |
452 } | |
453 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) { | |
454 Node* x = mms.memory(); | |
455 if (x->in(0) == region) { | |
456 assert(x->is_Phi(), "nobody else uses a hidden region"); | |
457 mms.set_memory(_gvn.transform(x)); | |
458 } | |
459 } | |
460 if (ex_oop->in(0) == region) { | |
461 assert(ex_oop->is_Phi(), "expected a special phi"); | |
462 ex_oop = _gvn.transform(ex_oop); | |
463 } | |
464 } else { | |
465 set_jvms(phi_map->jvms()); | |
466 } | |
467 | |
468 assert(!is_hidden_merge(phi_map->control()), "hidden ex. states cleared"); | |
469 assert(!is_hidden_merge(phi_map->i_o()), "hidden ex. states cleared"); | |
470 return ex_oop; | |
471 } | |
472 | |
473 //---------------------------------java_bc------------------------------------- | |
474 Bytecodes::Code GraphKit::java_bc() const { | |
475 ciMethod* method = this->method(); | |
476 int bci = this->bci(); | |
477 if (method != NULL && bci != InvocationEntryBci) | |
478 return method->java_code_at_bci(bci); | |
479 else | |
480 return Bytecodes::_illegal; | |
481 } | |
482 | |
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483 void GraphKit::uncommon_trap_if_should_post_on_exceptions(Deoptimization::DeoptReason reason, |
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484 bool must_throw) { |
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485 // if the exception capability is set, then we will generate code |
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486 // to check the JavaThread.should_post_on_exceptions flag to see |
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487 // if we actually need to report exception events (for this |
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488 // thread). If we don't need to report exception events, we will |
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489 // take the normal fast path provided by add_exception_events. If |
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490 // exception event reporting is enabled for this thread, we will |
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491 // take the uncommon_trap in the BuildCutout below. |
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492 |
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493 // first must access the should_post_on_exceptions_flag in this thread's JavaThread |
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494 Node* jthread = _gvn.transform(new (C) ThreadLocalNode()); |
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495 Node* adr = basic_plus_adr(top(), jthread, in_bytes(JavaThread::should_post_on_exceptions_flag_offset())); |
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496 Node* should_post_flag = make_load(control(), adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw, false); |
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497 |
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498 // Test the should_post_on_exceptions_flag vs. 0 |
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499 Node* chk = _gvn.transform( new (C) CmpINode(should_post_flag, intcon(0)) ); |
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500 Node* tst = _gvn.transform( new (C) BoolNode(chk, BoolTest::eq) ); |
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501 |
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502 // Branch to slow_path if should_post_on_exceptions_flag was true |
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503 { BuildCutout unless(this, tst, PROB_MAX); |
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504 // Do not try anything fancy if we're notifying the VM on every throw. |
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505 // Cf. case Bytecodes::_athrow in parse2.cpp. |
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506 uncommon_trap(reason, Deoptimization::Action_none, |
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507 (ciKlass*)NULL, (char*)NULL, must_throw); |
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508 } |
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509 |
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510 } |
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511 |
0 | 512 //------------------------------builtin_throw---------------------------------- |
513 void GraphKit::builtin_throw(Deoptimization::DeoptReason reason, Node* arg) { | |
514 bool must_throw = true; | |
515 | |
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516 if (env()->jvmti_can_post_on_exceptions()) { |
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517 // check if we must post exception events, take uncommon trap if so |
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518 uncommon_trap_if_should_post_on_exceptions(reason, must_throw); |
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519 // here if should_post_on_exceptions is false |
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520 // continue on with the normal codegen |
0 | 521 } |
522 | |
523 // If this particular condition has not yet happened at this | |
524 // bytecode, then use the uncommon trap mechanism, and allow for | |
525 // a future recompilation if several traps occur here. | |
526 // If the throw is hot, try to use a more complicated inline mechanism | |
527 // which keeps execution inside the compiled code. | |
528 bool treat_throw_as_hot = false; | |
529 ciMethodData* md = method()->method_data(); | |
530 | |
531 if (ProfileTraps) { | |
532 if (too_many_traps(reason)) { | |
533 treat_throw_as_hot = true; | |
534 } | |
535 // (If there is no MDO at all, assume it is early in | |
536 // execution, and that any deopts are part of the | |
537 // startup transient, and don't need to be remembered.) | |
538 | |
539 // Also, if there is a local exception handler, treat all throws | |
540 // as hot if there has been at least one in this method. | |
541 if (C->trap_count(reason) != 0 | |
542 && method()->method_data()->trap_count(reason) != 0 | |
543 && has_ex_handler()) { | |
544 treat_throw_as_hot = true; | |
545 } | |
546 } | |
547 | |
548 // If this throw happens frequently, an uncommon trap might cause | |
549 // a performance pothole. If there is a local exception handler, | |
550 // and if this particular bytecode appears to be deoptimizing often, | |
551 // let us handle the throw inline, with a preconstructed instance. | |
552 // Note: If the deopt count has blown up, the uncommon trap | |
553 // runtime is going to flush this nmethod, not matter what. | |
554 if (treat_throw_as_hot | |
555 && (!StackTraceInThrowable || OmitStackTraceInFastThrow)) { | |
556 // If the throw is local, we use a pre-existing instance and | |
557 // punt on the backtrace. This would lead to a missing backtrace | |
558 // (a repeat of 4292742) if the backtrace object is ever asked | |
559 // for its backtrace. | |
560 // Fixing this remaining case of 4292742 requires some flavor of | |
561 // escape analysis. Leave that for the future. | |
562 ciInstance* ex_obj = NULL; | |
563 switch (reason) { | |
564 case Deoptimization::Reason_null_check: | |
565 ex_obj = env()->NullPointerException_instance(); | |
566 break; | |
567 case Deoptimization::Reason_div0_check: | |
568 ex_obj = env()->ArithmeticException_instance(); | |
569 break; | |
570 case Deoptimization::Reason_range_check: | |
571 ex_obj = env()->ArrayIndexOutOfBoundsException_instance(); | |
572 break; | |
573 case Deoptimization::Reason_class_check: | |
574 if (java_bc() == Bytecodes::_aastore) { | |
575 ex_obj = env()->ArrayStoreException_instance(); | |
576 } else { | |
577 ex_obj = env()->ClassCastException_instance(); | |
578 } | |
579 break; | |
580 } | |
581 if (failing()) { stop(); return; } // exception allocation might fail | |
582 if (ex_obj != NULL) { | |
583 // Cheat with a preallocated exception object. | |
584 if (C->log() != NULL) | |
585 C->log()->elem("hot_throw preallocated='1' reason='%s'", | |
586 Deoptimization::trap_reason_name(reason)); | |
587 const TypeInstPtr* ex_con = TypeInstPtr::make(ex_obj); | |
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588 Node* ex_node = _gvn.transform( ConNode::make(C, ex_con) ); |
0 | 589 |
590 // Clear the detail message of the preallocated exception object. | |
591 // Weblogic sometimes mutates the detail message of exceptions | |
592 // using reflection. | |
593 int offset = java_lang_Throwable::get_detailMessage_offset(); | |
594 const TypePtr* adr_typ = ex_con->add_offset(offset); | |
595 | |
596 Node *adr = basic_plus_adr(ex_node, ex_node, offset); | |
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597 const TypeOopPtr* val_type = TypeOopPtr::make_from_klass(env()->String_klass()); |
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598 Node *store = store_oop_to_object(control(), ex_node, adr, adr_typ, null(), val_type, T_OBJECT); |
0 | 599 |
600 add_exception_state(make_exception_state(ex_node)); | |
601 return; | |
602 } | |
603 } | |
604 | |
605 // %%% Maybe add entry to OptoRuntime which directly throws the exc.? | |
606 // It won't be much cheaper than bailing to the interp., since we'll | |
607 // have to pass up all the debug-info, and the runtime will have to | |
608 // create the stack trace. | |
609 | |
610 // Usual case: Bail to interpreter. | |
611 // Reserve the right to recompile if we haven't seen anything yet. | |
612 | |
613 Deoptimization::DeoptAction action = Deoptimization::Action_maybe_recompile; | |
614 if (treat_throw_as_hot | |
615 && (method()->method_data()->trap_recompiled_at(bci()) | |
616 || C->too_many_traps(reason))) { | |
617 // We cannot afford to take more traps here. Suffer in the interpreter. | |
618 if (C->log() != NULL) | |
619 C->log()->elem("hot_throw preallocated='0' reason='%s' mcount='%d'", | |
620 Deoptimization::trap_reason_name(reason), | |
621 C->trap_count(reason)); | |
622 action = Deoptimization::Action_none; | |
623 } | |
624 | |
625 // "must_throw" prunes the JVM state to include only the stack, if there | |
626 // are no local exception handlers. This should cut down on register | |
627 // allocation time and code size, by drastically reducing the number | |
628 // of in-edges on the call to the uncommon trap. | |
629 | |
630 uncommon_trap(reason, action, (ciKlass*)NULL, (char*)NULL, must_throw); | |
631 } | |
632 | |
633 | |
634 //----------------------------PreserveJVMState--------------------------------- | |
635 PreserveJVMState::PreserveJVMState(GraphKit* kit, bool clone_map) { | |
636 debug_only(kit->verify_map()); | |
637 _kit = kit; | |
638 _map = kit->map(); // preserve the map | |
639 _sp = kit->sp(); | |
640 kit->set_map(clone_map ? kit->clone_map() : NULL); | |
641 #ifdef ASSERT | |
642 _bci = kit->bci(); | |
643 Parse* parser = kit->is_Parse(); | |
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644 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); |
0 | 645 _block = block; |
646 #endif | |
647 } | |
648 PreserveJVMState::~PreserveJVMState() { | |
649 GraphKit* kit = _kit; | |
650 #ifdef ASSERT | |
651 assert(kit->bci() == _bci, "bci must not shift"); | |
652 Parse* parser = kit->is_Parse(); | |
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653 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); |
0 | 654 assert(block == _block, "block must not shift"); |
655 #endif | |
656 kit->set_map(_map); | |
657 kit->set_sp(_sp); | |
658 } | |
659 | |
660 | |
661 //-----------------------------BuildCutout------------------------------------- | |
662 BuildCutout::BuildCutout(GraphKit* kit, Node* p, float prob, float cnt) | |
663 : PreserveJVMState(kit) | |
664 { | |
665 assert(p->is_Con() || p->is_Bool(), "test must be a bool"); | |
666 SafePointNode* outer_map = _map; // preserved map is caller's | |
667 SafePointNode* inner_map = kit->map(); | |
668 IfNode* iff = kit->create_and_map_if(outer_map->control(), p, prob, cnt); | |
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669 outer_map->set_control(kit->gvn().transform( new (kit->C) IfTrueNode(iff) )); |
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670 inner_map->set_control(kit->gvn().transform( new (kit->C) IfFalseNode(iff) )); |
0 | 671 } |
672 BuildCutout::~BuildCutout() { | |
673 GraphKit* kit = _kit; | |
674 assert(kit->stopped(), "cutout code must stop, throw, return, etc."); | |
675 } | |
676 | |
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677 //---------------------------PreserveReexecuteState---------------------------- |
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678 PreserveReexecuteState::PreserveReexecuteState(GraphKit* kit) { |
950
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679 assert(!kit->stopped(), "must call stopped() before"); |
900
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680 _kit = kit; |
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681 _sp = kit->sp(); |
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682 _reexecute = kit->jvms()->_reexecute; |
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683 } |
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684 PreserveReexecuteState::~PreserveReexecuteState() { |
950
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685 if (_kit->stopped()) return; |
900
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686 _kit->jvms()->_reexecute = _reexecute; |
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687 _kit->set_sp(_sp); |
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688 } |
0 | 689 |
690 //------------------------------clone_map-------------------------------------- | |
691 // Implementation of PreserveJVMState | |
692 // | |
693 // Only clone_map(...) here. If this function is only used in the | |
694 // PreserveJVMState class we may want to get rid of this extra | |
695 // function eventually and do it all there. | |
696 | |
697 SafePointNode* GraphKit::clone_map() { | |
698 if (map() == NULL) return NULL; | |
699 | |
700 // Clone the memory edge first | |
701 Node* mem = MergeMemNode::make(C, map()->memory()); | |
702 gvn().set_type_bottom(mem); | |
703 | |
704 SafePointNode *clonemap = (SafePointNode*)map()->clone(); | |
705 JVMState* jvms = this->jvms(); | |
706 JVMState* clonejvms = jvms->clone_shallow(C); | |
707 clonemap->set_memory(mem); | |
708 clonemap->set_jvms(clonejvms); | |
709 clonejvms->set_map(clonemap); | |
710 record_for_igvn(clonemap); | |
711 gvn().set_type_bottom(clonemap); | |
712 return clonemap; | |
713 } | |
714 | |
715 | |
716 //-----------------------------set_map_clone----------------------------------- | |
717 void GraphKit::set_map_clone(SafePointNode* m) { | |
718 _map = m; | |
719 _map = clone_map(); | |
720 _map->set_next_exception(NULL); | |
721 debug_only(verify_map()); | |
722 } | |
723 | |
724 | |
725 //----------------------------kill_dead_locals--------------------------------- | |
726 // Detect any locals which are known to be dead, and force them to top. | |
727 void GraphKit::kill_dead_locals() { | |
728 // Consult the liveness information for the locals. If any | |
729 // of them are unused, then they can be replaced by top(). This | |
730 // should help register allocation time and cut down on the size | |
731 // of the deoptimization information. | |
732 | |
733 // This call is made from many of the bytecode handling | |
734 // subroutines called from the Big Switch in do_one_bytecode. | |
735 // Every bytecode which might include a slow path is responsible | |
736 // for killing its dead locals. The more consistent we | |
737 // are about killing deads, the fewer useless phis will be | |
738 // constructed for them at various merge points. | |
739 | |
740 // bci can be -1 (InvocationEntryBci). We return the entry | |
741 // liveness for the method. | |
742 | |
743 if (method() == NULL || method()->code_size() == 0) { | |
744 // We are building a graph for a call to a native method. | |
745 // All locals are live. | |
746 return; | |
747 } | |
748 | |
749 ResourceMark rm; | |
750 | |
751 // Consult the liveness information for the locals. If any | |
752 // of them are unused, then they can be replaced by top(). This | |
753 // should help register allocation time and cut down on the size | |
754 // of the deoptimization information. | |
755 MethodLivenessResult live_locals = method()->liveness_at_bci(bci()); | |
756 | |
757 int len = (int)live_locals.size(); | |
758 assert(len <= jvms()->loc_size(), "too many live locals"); | |
759 for (int local = 0; local < len; local++) { | |
760 if (!live_locals.at(local)) { | |
761 set_local(local, top()); | |
762 } | |
763 } | |
764 } | |
765 | |
766 #ifdef ASSERT | |
767 //-------------------------dead_locals_are_killed------------------------------ | |
768 // Return true if all dead locals are set to top in the map. | |
769 // Used to assert "clean" debug info at various points. | |
770 bool GraphKit::dead_locals_are_killed() { | |
771 if (method() == NULL || method()->code_size() == 0) { | |
772 // No locals need to be dead, so all is as it should be. | |
773 return true; | |
774 } | |
775 | |
776 // Make sure somebody called kill_dead_locals upstream. | |
777 ResourceMark rm; | |
778 for (JVMState* jvms = this->jvms(); jvms != NULL; jvms = jvms->caller()) { | |
779 if (jvms->loc_size() == 0) continue; // no locals to consult | |
780 SafePointNode* map = jvms->map(); | |
781 ciMethod* method = jvms->method(); | |
782 int bci = jvms->bci(); | |
783 if (jvms == this->jvms()) { | |
784 bci = this->bci(); // it might not yet be synched | |
785 } | |
786 MethodLivenessResult live_locals = method->liveness_at_bci(bci); | |
787 int len = (int)live_locals.size(); | |
788 if (!live_locals.is_valid() || len == 0) | |
789 // This method is trivial, or is poisoned by a breakpoint. | |
790 return true; | |
791 assert(len == jvms->loc_size(), "live map consistent with locals map"); | |
792 for (int local = 0; local < len; local++) { | |
793 if (!live_locals.at(local) && map->local(jvms, local) != top()) { | |
794 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
795 tty->print_cr("Zombie local %d: ", local); | |
796 jvms->dump(); | |
797 } | |
798 return false; | |
799 } | |
800 } | |
801 } | |
802 return true; | |
803 } | |
804 | |
805 #endif //ASSERT | |
806 | |
900
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807 // Helper function for enforcing certain bytecodes to reexecute if |
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808 // deoptimization happens |
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809 static bool should_reexecute_implied_by_bytecode(JVMState *jvms, bool is_anewarray) { |
900
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810 ciMethod* cur_method = jvms->method(); |
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811 int cur_bci = jvms->bci(); |
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812 if (cur_method != NULL && cur_bci != InvocationEntryBci) { |
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813 Bytecodes::Code code = cur_method->java_code_at_bci(cur_bci); |
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814 return Interpreter::bytecode_should_reexecute(code) || |
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815 is_anewarray && code == Bytecodes::_multianewarray; |
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816 // Reexecute _multianewarray bytecode which was replaced with |
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817 // sequence of [a]newarray. See Parse::do_multianewarray(). |
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818 // |
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819 // Note: interpreter should not have it set since this optimization |
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820 // is limited by dimensions and guarded by flag so in some cases |
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821 // multianewarray() runtime calls will be generated and |
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822 // the bytecode should not be reexecutes (stack will not be reset). |
900
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823 } else |
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824 return false; |
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825 } |
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826 |
0 | 827 // Helper function for adding JVMState and debug information to node |
828 void GraphKit::add_safepoint_edges(SafePointNode* call, bool must_throw) { | |
829 // Add the safepoint edges to the call (or other safepoint). | |
830 | |
831 // Make sure dead locals are set to top. This | |
832 // should help register allocation time and cut down on the size | |
833 // of the deoptimization information. | |
834 assert(dead_locals_are_killed(), "garbage in debug info before safepoint"); | |
835 | |
836 // Walk the inline list to fill in the correct set of JVMState's | |
837 // Also fill in the associated edges for each JVMState. | |
838 | |
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839 // If the bytecode needs to be reexecuted we need to put |
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840 // the arguments back on the stack. |
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841 const bool should_reexecute = jvms()->should_reexecute(); |
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842 JVMState* youngest_jvms = should_reexecute ? sync_jvms_for_reexecute() : sync_jvms(); |
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843 |
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844 // NOTE: set_bci (called from sync_jvms) might reset the reexecute bit to |
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845 // undefined if the bci is different. This is normal for Parse but it |
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846 // should not happen for LibraryCallKit because only one bci is processed. |
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847 assert(!is_LibraryCallKit() || (jvms()->should_reexecute() == should_reexecute), |
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848 "in LibraryCallKit the reexecute bit should not change"); |
0 | 849 |
850 // If we are guaranteed to throw, we can prune everything but the | |
851 // input to the current bytecode. | |
852 bool can_prune_locals = false; | |
853 uint stack_slots_not_pruned = 0; | |
854 int inputs = 0, depth = 0; | |
855 if (must_throw) { | |
856 assert(method() == youngest_jvms->method(), "sanity"); | |
857 if (compute_stack_effects(inputs, depth)) { | |
858 can_prune_locals = true; | |
859 stack_slots_not_pruned = inputs; | |
860 } | |
861 } | |
862 | |
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863 if (env()->jvmti_can_access_local_variables()) { |
0 | 864 // At any safepoint, this method can get breakpointed, which would |
865 // then require an immediate deoptimization. | |
866 can_prune_locals = false; // do not prune locals | |
867 stack_slots_not_pruned = 0; | |
868 } | |
869 | |
870 // do not scribble on the input jvms | |
871 JVMState* out_jvms = youngest_jvms->clone_deep(C); | |
872 call->set_jvms(out_jvms); // Start jvms list for call node | |
873 | |
900
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874 // For a known set of bytecodes, the interpreter should reexecute them if |
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875 // deoptimization happens. We set the reexecute state for them here |
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876 if (out_jvms->is_reexecute_undefined() && //don't change if already specified |
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877 should_reexecute_implied_by_bytecode(out_jvms, call->is_AllocateArray())) { |
900
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878 out_jvms->set_should_reexecute(true); //NOTE: youngest_jvms not changed |
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879 } |
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880 |
0 | 881 // Presize the call: |
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882 DEBUG_ONLY(uint non_debug_edges = call->req()); |
0 | 883 call->add_req_batch(top(), youngest_jvms->debug_depth()); |
884 assert(call->req() == non_debug_edges + youngest_jvms->debug_depth(), ""); | |
885 | |
886 // Set up edges so that the call looks like this: | |
887 // Call [state:] ctl io mem fptr retadr | |
888 // [parms:] parm0 ... parmN | |
889 // [root:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN | |
890 // [...mid:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN [...] | |
891 // [young:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN | |
892 // Note that caller debug info precedes callee debug info. | |
893 | |
894 // Fill pointer walks backwards from "young:" to "root:" in the diagram above: | |
895 uint debug_ptr = call->req(); | |
896 | |
897 // Loop over the map input edges associated with jvms, add them | |
898 // to the call node, & reset all offsets to match call node array. | |
899 for (JVMState* in_jvms = youngest_jvms; in_jvms != NULL; ) { | |
900 uint debug_end = debug_ptr; | |
901 uint debug_start = debug_ptr - in_jvms->debug_size(); | |
902 debug_ptr = debug_start; // back up the ptr | |
903 | |
904 uint p = debug_start; // walks forward in [debug_start, debug_end) | |
905 uint j, k, l; | |
906 SafePointNode* in_map = in_jvms->map(); | |
907 out_jvms->set_map(call); | |
908 | |
909 if (can_prune_locals) { | |
910 assert(in_jvms->method() == out_jvms->method(), "sanity"); | |
911 // If the current throw can reach an exception handler in this JVMS, | |
912 // then we must keep everything live that can reach that handler. | |
913 // As a quick and dirty approximation, we look for any handlers at all. | |
914 if (in_jvms->method()->has_exception_handlers()) { | |
915 can_prune_locals = false; | |
916 } | |
917 } | |
918 | |
919 // Add the Locals | |
920 k = in_jvms->locoff(); | |
921 l = in_jvms->loc_size(); | |
922 out_jvms->set_locoff(p); | |
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923 if (!can_prune_locals) { |
0 | 924 for (j = 0; j < l; j++) |
925 call->set_req(p++, in_map->in(k+j)); | |
926 } else { | |
927 p += l; // already set to top above by add_req_batch | |
928 } | |
929 | |
930 // Add the Expression Stack | |
931 k = in_jvms->stkoff(); | |
932 l = in_jvms->sp(); | |
933 out_jvms->set_stkoff(p); | |
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934 if (!can_prune_locals) { |
0 | 935 for (j = 0; j < l; j++) |
936 call->set_req(p++, in_map->in(k+j)); | |
937 } else if (can_prune_locals && stack_slots_not_pruned != 0) { | |
938 // Divide stack into {S0,...,S1}, where S0 is set to top. | |
939 uint s1 = stack_slots_not_pruned; | |
940 stack_slots_not_pruned = 0; // for next iteration | |
941 if (s1 > l) s1 = l; | |
942 uint s0 = l - s1; | |
943 p += s0; // skip the tops preinstalled by add_req_batch | |
944 for (j = s0; j < l; j++) | |
945 call->set_req(p++, in_map->in(k+j)); | |
946 } else { | |
947 p += l; // already set to top above by add_req_batch | |
948 } | |
949 | |
950 // Add the Monitors | |
951 k = in_jvms->monoff(); | |
952 l = in_jvms->mon_size(); | |
953 out_jvms->set_monoff(p); | |
954 for (j = 0; j < l; j++) | |
955 call->set_req(p++, in_map->in(k+j)); | |
956 | |
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957 // Copy any scalar object fields. |
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958 k = in_jvms->scloff(); |
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959 l = in_jvms->scl_size(); |
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960 out_jvms->set_scloff(p); |
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961 for (j = 0; j < l; j++) |
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962 call->set_req(p++, in_map->in(k+j)); |
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963 |
0 | 964 // Finish the new jvms. |
965 out_jvms->set_endoff(p); | |
966 | |
967 assert(out_jvms->endoff() == debug_end, "fill ptr must match"); | |
968 assert(out_jvms->depth() == in_jvms->depth(), "depth must match"); | |
969 assert(out_jvms->loc_size() == in_jvms->loc_size(), "size must match"); | |
970 assert(out_jvms->mon_size() == in_jvms->mon_size(), "size must match"); | |
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971 assert(out_jvms->scl_size() == in_jvms->scl_size(), "size must match"); |
0 | 972 assert(out_jvms->debug_size() == in_jvms->debug_size(), "size must match"); |
973 | |
974 // Update the two tail pointers in parallel. | |
975 out_jvms = out_jvms->caller(); | |
976 in_jvms = in_jvms->caller(); | |
977 } | |
978 | |
979 assert(debug_ptr == non_debug_edges, "debug info must fit exactly"); | |
980 | |
981 // Test the correctness of JVMState::debug_xxx accessors: | |
982 assert(call->jvms()->debug_start() == non_debug_edges, ""); | |
983 assert(call->jvms()->debug_end() == call->req(), ""); | |
984 assert(call->jvms()->debug_depth() == call->req() - non_debug_edges, ""); | |
985 } | |
986 | |
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987 bool GraphKit::compute_stack_effects(int& inputs, int& depth) { |
0 | 988 Bytecodes::Code code = java_bc(); |
989 if (code == Bytecodes::_wide) { | |
990 code = method()->java_code_at_bci(bci() + 1); | |
991 } | |
992 | |
993 BasicType rtype = T_ILLEGAL; | |
994 int rsize = 0; | |
995 | |
996 if (code != Bytecodes::_illegal) { | |
997 depth = Bytecodes::depth(code); // checkcast=0, athrow=-1 | |
998 rtype = Bytecodes::result_type(code); // checkcast=P, athrow=V | |
999 if (rtype < T_CONFLICT) | |
1000 rsize = type2size[rtype]; | |
1001 } | |
1002 | |
1003 switch (code) { | |
1004 case Bytecodes::_illegal: | |
1005 return false; | |
1006 | |
1007 case Bytecodes::_ldc: | |
1008 case Bytecodes::_ldc_w: | |
1009 case Bytecodes::_ldc2_w: | |
1010 inputs = 0; | |
1011 break; | |
1012 | |
1013 case Bytecodes::_dup: inputs = 1; break; | |
1014 case Bytecodes::_dup_x1: inputs = 2; break; | |
1015 case Bytecodes::_dup_x2: inputs = 3; break; | |
1016 case Bytecodes::_dup2: inputs = 2; break; | |
1017 case Bytecodes::_dup2_x1: inputs = 3; break; | |
1018 case Bytecodes::_dup2_x2: inputs = 4; break; | |
1019 case Bytecodes::_swap: inputs = 2; break; | |
1020 case Bytecodes::_arraylength: inputs = 1; break; | |
1021 | |
1022 case Bytecodes::_getstatic: | |
1023 case Bytecodes::_putstatic: | |
1024 case Bytecodes::_getfield: | |
1025 case Bytecodes::_putfield: | |
1026 { | |
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1027 bool ignored_will_link; |
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1028 ciField* field = method()->get_field_at_bci(bci(), ignored_will_link); |
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1029 int size = field->type()->size(); |
0 | 1030 bool is_get = (depth >= 0), is_static = (depth & 1); |
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1031 inputs = (is_static ? 0 : 1); |
0 | 1032 if (is_get) { |
1033 depth = size - inputs; | |
1034 } else { | |
1035 inputs += size; // putxxx pops the value from the stack | |
1036 depth = - inputs; | |
1037 } | |
1038 } | |
1039 break; | |
1040 | |
1041 case Bytecodes::_invokevirtual: | |
1042 case Bytecodes::_invokespecial: | |
1043 case Bytecodes::_invokestatic: | |
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1044 case Bytecodes::_invokedynamic: |
0 | 1045 case Bytecodes::_invokeinterface: |
1046 { | |
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1047 bool ignored_will_link; |
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1048 ciSignature* declared_signature = NULL; |
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1049 ciMethod* ignored_callee = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature); |
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1050 assert(declared_signature != NULL, "cannot be null"); |
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1051 inputs = declared_signature->arg_size_for_bc(code); |
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1052 int size = declared_signature->return_type()->size(); |
0 | 1053 depth = size - inputs; |
1054 } | |
1055 break; | |
1056 | |
1057 case Bytecodes::_multianewarray: | |
1058 { | |
1059 ciBytecodeStream iter(method()); | |
1060 iter.reset_to_bci(bci()); | |
1061 iter.next(); | |
1062 inputs = iter.get_dimensions(); | |
1063 assert(rsize == 1, ""); | |
1064 depth = rsize - inputs; | |
1065 } | |
1066 break; | |
1067 | |
1068 case Bytecodes::_ireturn: | |
1069 case Bytecodes::_lreturn: | |
1070 case Bytecodes::_freturn: | |
1071 case Bytecodes::_dreturn: | |
1072 case Bytecodes::_areturn: | |
1073 assert(rsize = -depth, ""); | |
1074 inputs = rsize; | |
1075 break; | |
1076 | |
1077 case Bytecodes::_jsr: | |
1078 case Bytecodes::_jsr_w: | |
1079 inputs = 0; | |
1080 depth = 1; // S.B. depth=1, not zero | |
1081 break; | |
1082 | |
1083 default: | |
1084 // bytecode produces a typed result | |
1085 inputs = rsize - depth; | |
1086 assert(inputs >= 0, ""); | |
1087 break; | |
1088 } | |
1089 | |
1090 #ifdef ASSERT | |
1091 // spot check | |
1092 int outputs = depth + inputs; | |
1093 assert(outputs >= 0, "sanity"); | |
1094 switch (code) { | |
1095 case Bytecodes::_checkcast: assert(inputs == 1 && outputs == 1, ""); break; | |
1096 case Bytecodes::_athrow: assert(inputs == 1 && outputs == 0, ""); break; | |
1097 case Bytecodes::_aload_0: assert(inputs == 0 && outputs == 1, ""); break; | |
1098 case Bytecodes::_return: assert(inputs == 0 && outputs == 0, ""); break; | |
1099 case Bytecodes::_drem: assert(inputs == 4 && outputs == 2, ""); break; | |
1100 } | |
1101 #endif //ASSERT | |
1102 | |
1103 return true; | |
1104 } | |
1105 | |
1106 | |
1107 | |
1108 //------------------------------basic_plus_adr--------------------------------- | |
1109 Node* GraphKit::basic_plus_adr(Node* base, Node* ptr, Node* offset) { | |
1110 // short-circuit a common case | |
1111 if (offset == intcon(0)) return ptr; | |
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1112 return _gvn.transform( new (C) AddPNode(base, ptr, offset) ); |
0 | 1113 } |
1114 | |
1115 Node* GraphKit::ConvI2L(Node* offset) { | |
1116 // short-circuit a common case | |
1117 jint offset_con = find_int_con(offset, Type::OffsetBot); | |
1118 if (offset_con != Type::OffsetBot) { | |
6846 | 1119 return longcon((jlong) offset_con); |
0 | 1120 } |
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1121 return _gvn.transform( new (C) ConvI2LNode(offset)); |
0 | 1122 } |
1123 Node* GraphKit::ConvL2I(Node* offset) { | |
1124 // short-circuit a common case | |
1125 jlong offset_con = find_long_con(offset, (jlong)Type::OffsetBot); | |
1126 if (offset_con != (jlong)Type::OffsetBot) { | |
1127 return intcon((int) offset_con); | |
1128 } | |
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1129 return _gvn.transform( new (C) ConvL2INode(offset)); |
0 | 1130 } |
1131 | |
1132 //-------------------------load_object_klass----------------------------------- | |
1133 Node* GraphKit::load_object_klass(Node* obj) { | |
1134 // Special-case a fresh allocation to avoid building nodes: | |
1135 Node* akls = AllocateNode::Ideal_klass(obj, &_gvn); | |
1136 if (akls != NULL) return akls; | |
1137 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes()); | |
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1138 return _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), k_adr, TypeInstPtr::KLASS) ); |
0 | 1139 } |
1140 | |
1141 //-------------------------load_array_length----------------------------------- | |
1142 Node* GraphKit::load_array_length(Node* array) { | |
1143 // Special-case a fresh allocation to avoid building nodes: | |
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1144 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(array, &_gvn); |
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1145 Node *alen; |
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1146 if (alloc == NULL) { |
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1147 Node *r_adr = basic_plus_adr(array, arrayOopDesc::length_offset_in_bytes()); |
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1148 alen = _gvn.transform( new (C) LoadRangeNode(0, immutable_memory(), r_adr, TypeInt::POS)); |
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1149 } else { |
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1150 alen = alloc->Ideal_length(); |
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1151 Node* ccast = alloc->make_ideal_length(_gvn.type(array)->is_oopptr(), &_gvn); |
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1152 if (ccast != alen) { |
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1153 alen = _gvn.transform(ccast); |
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1154 } |
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1155 } |
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1156 return alen; |
0 | 1157 } |
1158 | |
1159 //------------------------------do_null_check---------------------------------- | |
1160 // Helper function to do a NULL pointer check. Returned value is | |
1161 // the incoming address with NULL casted away. You are allowed to use the | |
1162 // not-null value only if you are control dependent on the test. | |
1163 extern int explicit_null_checks_inserted, | |
1164 explicit_null_checks_elided; | |
1165 Node* GraphKit::null_check_common(Node* value, BasicType type, | |
1166 // optional arguments for variations: | |
1167 bool assert_null, | |
1168 Node* *null_control) { | |
1169 assert(!assert_null || null_control == NULL, "not both at once"); | |
1170 if (stopped()) return top(); | |
1171 if (!GenerateCompilerNullChecks && !assert_null && null_control == NULL) { | |
1172 // For some performance testing, we may wish to suppress null checking. | |
1173 value = cast_not_null(value); // Make it appear to be non-null (4962416). | |
1174 return value; | |
1175 } | |
1176 explicit_null_checks_inserted++; | |
1177 | |
1178 // Construct NULL check | |
1179 Node *chk = NULL; | |
1180 switch(type) { | |
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1181 case T_LONG : chk = new (C) CmpLNode(value, _gvn.zerocon(T_LONG)); break; |
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1182 case T_INT : chk = new (C) CmpINode(value, _gvn.intcon(0)); break; |
0 | 1183 case T_ARRAY : // fall through |
1184 type = T_OBJECT; // simplify further tests | |
1185 case T_OBJECT : { | |
1186 const Type *t = _gvn.type( value ); | |
1187 | |
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1188 const TypeOopPtr* tp = t->isa_oopptr(); |
955 | 1189 if (tp != NULL && tp->klass() != NULL && !tp->klass()->is_loaded() |
0 | 1190 // Only for do_null_check, not any of its siblings: |
1191 && !assert_null && null_control == NULL) { | |
1192 // Usually, any field access or invocation on an unloaded oop type | |
1193 // will simply fail to link, since the statically linked class is | |
1194 // likely also to be unloaded. However, in -Xcomp mode, sometimes | |
1195 // the static class is loaded but the sharper oop type is not. | |
1196 // Rather than checking for this obscure case in lots of places, | |
1197 // we simply observe that a null check on an unloaded class | |
1198 // will always be followed by a nonsense operation, so we | |
1199 // can just issue the uncommon trap here. | |
1200 // Our access to the unloaded class will only be correct | |
1201 // after it has been loaded and initialized, which requires | |
1202 // a trip through the interpreter. | |
1203 #ifndef PRODUCT | |
1204 if (WizardMode) { tty->print("Null check of unloaded "); tp->klass()->print(); tty->cr(); } | |
1205 #endif | |
1206 uncommon_trap(Deoptimization::Reason_unloaded, | |
1207 Deoptimization::Action_reinterpret, | |
1208 tp->klass(), "!loaded"); | |
1209 return top(); | |
1210 } | |
1211 | |
1212 if (assert_null) { | |
1213 // See if the type is contained in NULL_PTR. | |
1214 // If so, then the value is already null. | |
1215 if (t->higher_equal(TypePtr::NULL_PTR)) { | |
1216 explicit_null_checks_elided++; | |
1217 return value; // Elided null assert quickly! | |
1218 } | |
1219 } else { | |
1220 // See if mixing in the NULL pointer changes type. | |
1221 // If so, then the NULL pointer was not allowed in the original | |
1222 // type. In other words, "value" was not-null. | |
1223 if (t->meet(TypePtr::NULL_PTR) != t) { | |
1224 // same as: if (!TypePtr::NULL_PTR->higher_equal(t)) ... | |
1225 explicit_null_checks_elided++; | |
1226 return value; // Elided null check quickly! | |
1227 } | |
1228 } | |
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1229 chk = new (C) CmpPNode( value, null() ); |
0 | 1230 break; |
1231 } | |
1232 | |
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1233 default: |
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1234 fatal(err_msg_res("unexpected type: %s", type2name(type))); |
0 | 1235 } |
1236 assert(chk != NULL, "sanity check"); | |
1237 chk = _gvn.transform(chk); | |
1238 | |
1239 BoolTest::mask btest = assert_null ? BoolTest::eq : BoolTest::ne; | |
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1240 BoolNode *btst = new (C) BoolNode( chk, btest); |
0 | 1241 Node *tst = _gvn.transform( btst ); |
1242 | |
1243 //----------- | |
605 | 1244 // if peephole optimizations occurred, a prior test existed. |
0 | 1245 // If a prior test existed, maybe it dominates as we can avoid this test. |
1246 if (tst != btst && type == T_OBJECT) { | |
1247 // At this point we want to scan up the CFG to see if we can | |
1248 // find an identical test (and so avoid this test altogether). | |
1249 Node *cfg = control(); | |
1250 int depth = 0; | |
1251 while( depth < 16 ) { // Limit search depth for speed | |
1252 if( cfg->Opcode() == Op_IfTrue && | |
1253 cfg->in(0)->in(1) == tst ) { | |
1254 // Found prior test. Use "cast_not_null" to construct an identical | |
1255 // CastPP (and hence hash to) as already exists for the prior test. | |
1256 // Return that casted value. | |
1257 if (assert_null) { | |
1258 replace_in_map(value, null()); | |
1259 return null(); // do not issue the redundant test | |
1260 } | |
1261 Node *oldcontrol = control(); | |
1262 set_control(cfg); | |
1263 Node *res = cast_not_null(value); | |
1264 set_control(oldcontrol); | |
1265 explicit_null_checks_elided++; | |
1266 return res; | |
1267 } | |
1268 cfg = IfNode::up_one_dom(cfg, /*linear_only=*/ true); | |
1269 if (cfg == NULL) break; // Quit at region nodes | |
1270 depth++; | |
1271 } | |
1272 } | |
1273 | |
1274 //----------- | |
1275 // Branch to failure if null | |
1276 float ok_prob = PROB_MAX; // a priori estimate: nulls never happen | |
1277 Deoptimization::DeoptReason reason; | |
1278 if (assert_null) | |
1279 reason = Deoptimization::Reason_null_assert; | |
1280 else if (type == T_OBJECT) | |
1281 reason = Deoptimization::Reason_null_check; | |
1282 else | |
1283 reason = Deoptimization::Reason_div0_check; | |
1284 | |
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1285 // %%% Since Reason_unhandled is not recorded on a per-bytecode basis, |
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1286 // ciMethodData::has_trap_at will return a conservative -1 if any |
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1287 // must-be-null assertion has failed. This could cause performance |
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1288 // problems for a method after its first do_null_assert failure. |
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1289 // Consider using 'Reason_class_check' instead? |
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1290 |
0 | 1291 // To cause an implicit null check, we set the not-null probability |
605 | 1292 // to the maximum (PROB_MAX). For an explicit check the probability |
0 | 1293 // is set to a smaller value. |
1294 if (null_control != NULL || too_many_traps(reason)) { | |
1295 // probability is less likely | |
1296 ok_prob = PROB_LIKELY_MAG(3); | |
1297 } else if (!assert_null && | |
1298 (ImplicitNullCheckThreshold > 0) && | |
1299 method() != NULL && | |
1300 (method()->method_data()->trap_count(reason) | |
1301 >= (uint)ImplicitNullCheckThreshold)) { | |
1302 ok_prob = PROB_LIKELY_MAG(3); | |
1303 } | |
1304 | |
1305 if (null_control != NULL) { | |
1306 IfNode* iff = create_and_map_if(control(), tst, ok_prob, COUNT_UNKNOWN); | |
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1307 Node* null_true = _gvn.transform( new (C) IfFalseNode(iff)); |
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1308 set_control( _gvn.transform( new (C) IfTrueNode(iff))); |
0 | 1309 if (null_true == top()) |
1310 explicit_null_checks_elided++; | |
1311 (*null_control) = null_true; | |
1312 } else { | |
1313 BuildCutout unless(this, tst, ok_prob); | |
1314 // Check for optimizer eliding test at parse time | |
1315 if (stopped()) { | |
1316 // Failure not possible; do not bother making uncommon trap. | |
1317 explicit_null_checks_elided++; | |
1318 } else if (assert_null) { | |
1319 uncommon_trap(reason, | |
1320 Deoptimization::Action_make_not_entrant, | |
1321 NULL, "assert_null"); | |
1322 } else { | |
332 | 1323 replace_in_map(value, zerocon(type)); |
0 | 1324 builtin_throw(reason); |
1325 } | |
1326 } | |
1327 | |
1328 // Must throw exception, fall-thru not possible? | |
1329 if (stopped()) { | |
1330 return top(); // No result | |
1331 } | |
1332 | |
1333 if (assert_null) { | |
1334 // Cast obj to null on this path. | |
1335 replace_in_map(value, zerocon(type)); | |
1336 return zerocon(type); | |
1337 } | |
1338 | |
1339 // Cast obj to not-null on this path, if there is no null_control. | |
1340 // (If there is a null_control, a non-null value may come back to haunt us.) | |
1341 if (type == T_OBJECT) { | |
1342 Node* cast = cast_not_null(value, false); | |
1343 if (null_control == NULL || (*null_control) == top()) | |
1344 replace_in_map(value, cast); | |
1345 value = cast; | |
1346 } | |
1347 | |
1348 return value; | |
1349 } | |
1350 | |
1351 | |
1352 //------------------------------cast_not_null---------------------------------- | |
1353 // Cast obj to not-null on this path | |
1354 Node* GraphKit::cast_not_null(Node* obj, bool do_replace_in_map) { | |
1355 const Type *t = _gvn.type(obj); | |
1356 const Type *t_not_null = t->join(TypePtr::NOTNULL); | |
1357 // Object is already not-null? | |
1358 if( t == t_not_null ) return obj; | |
1359 | |
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1360 Node *cast = new (C) CastPPNode(obj,t_not_null); |
0 | 1361 cast->init_req(0, control()); |
1362 cast = _gvn.transform( cast ); | |
1363 | |
1364 // Scan for instances of 'obj' in the current JVM mapping. | |
1365 // These instances are known to be not-null after the test. | |
1366 if (do_replace_in_map) | |
1367 replace_in_map(obj, cast); | |
1368 | |
1369 return cast; // Return casted value | |
1370 } | |
1371 | |
1372 | |
1373 //--------------------------replace_in_map------------------------------------- | |
1374 void GraphKit::replace_in_map(Node* old, Node* neww) { | |
1375 this->map()->replace_edge(old, neww); | |
1376 | |
1377 // Note: This operation potentially replaces any edge | |
1378 // on the map. This includes locals, stack, and monitors | |
1379 // of the current (innermost) JVM state. | |
1380 | |
1381 // We can consider replacing in caller maps. | |
1382 // The idea would be that an inlined function's null checks | |
1383 // can be shared with the entire inlining tree. | |
1384 // The expense of doing this is that the PreserveJVMState class | |
1385 // would have to preserve caller states too, with a deep copy. | |
1386 } | |
1387 | |
1388 | |
1389 //============================================================================= | |
1390 //--------------------------------memory--------------------------------------- | |
1391 Node* GraphKit::memory(uint alias_idx) { | |
1392 MergeMemNode* mem = merged_memory(); | |
1393 Node* p = mem->memory_at(alias_idx); | |
1394 _gvn.set_type(p, Type::MEMORY); // must be mapped | |
1395 return p; | |
1396 } | |
1397 | |
1398 //-----------------------------reset_memory------------------------------------ | |
1399 Node* GraphKit::reset_memory() { | |
1400 Node* mem = map()->memory(); | |
1401 // do not use this node for any more parsing! | |
1402 debug_only( map()->set_memory((Node*)NULL) ); | |
1403 return _gvn.transform( mem ); | |
1404 } | |
1405 | |
1406 //------------------------------set_all_memory--------------------------------- | |
1407 void GraphKit::set_all_memory(Node* newmem) { | |
1408 Node* mergemem = MergeMemNode::make(C, newmem); | |
1409 gvn().set_type_bottom(mergemem); | |
1410 map()->set_memory(mergemem); | |
1411 } | |
1412 | |
1413 //------------------------------set_all_memory_call---------------------------- | |
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1414 void GraphKit::set_all_memory_call(Node* call, bool separate_io_proj) { |
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1415 Node* newmem = _gvn.transform( new (C) ProjNode(call, TypeFunc::Memory, separate_io_proj) ); |
0 | 1416 set_all_memory(newmem); |
1417 } | |
1418 | |
1419 //============================================================================= | |
1420 // | |
1421 // parser factory methods for MemNodes | |
1422 // | |
1423 // These are layered on top of the factory methods in LoadNode and StoreNode, | |
1424 // and integrate with the parser's memory state and _gvn engine. | |
1425 // | |
1426 | |
1427 // factory methods in "int adr_idx" | |
1428 Node* GraphKit::make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, | |
1429 int adr_idx, | |
1430 bool require_atomic_access) { | |
1431 assert(adr_idx != Compile::AliasIdxTop, "use other make_load factory" ); | |
1432 const TypePtr* adr_type = NULL; // debug-mode-only argument | |
1433 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
1434 Node* mem = memory(adr_idx); | |
1435 Node* ld; | |
1436 if (require_atomic_access && bt == T_LONG) { | |
1437 ld = LoadLNode::make_atomic(C, ctl, mem, adr, adr_type, t); | |
1438 } else { | |
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1439 ld = LoadNode::make(_gvn, ctl, mem, adr, adr_type, t, bt); |
0 | 1440 } |
1441 return _gvn.transform(ld); | |
1442 } | |
1443 | |
1444 Node* GraphKit::store_to_memory(Node* ctl, Node* adr, Node *val, BasicType bt, | |
1445 int adr_idx, | |
1446 bool require_atomic_access) { | |
1447 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); | |
1448 const TypePtr* adr_type = NULL; | |
1449 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
1450 Node *mem = memory(adr_idx); | |
1451 Node* st; | |
1452 if (require_atomic_access && bt == T_LONG) { | |
1453 st = StoreLNode::make_atomic(C, ctl, mem, adr, adr_type, val); | |
1454 } else { | |
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1455 st = StoreNode::make(_gvn, ctl, mem, adr, adr_type, val, bt); |
0 | 1456 } |
1457 st = _gvn.transform(st); | |
1458 set_memory(st, adr_idx); | |
1459 // Back-to-back stores can only remove intermediate store with DU info | |
1460 // so push on worklist for optimizer. | |
1461 if (mem->req() > MemNode::Address && adr == mem->in(MemNode::Address)) | |
1462 record_for_igvn(st); | |
1463 | |
1464 return st; | |
1465 } | |
1466 | |
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1467 |
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1468 void GraphKit::pre_barrier(bool do_load, |
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1469 Node* ctl, |
0 | 1470 Node* obj, |
1471 Node* adr, | |
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1472 uint adr_idx, |
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1473 Node* val, |
825 | 1474 const TypeOopPtr* val_type, |
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1475 Node* pre_val, |
0 | 1476 BasicType bt) { |
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1477 |
0 | 1478 BarrierSet* bs = Universe::heap()->barrier_set(); |
1479 set_control(ctl); | |
1480 switch (bs->kind()) { | |
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1481 case BarrierSet::G1SATBCT: |
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1482 case BarrierSet::G1SATBCTLogging: |
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1483 g1_write_barrier_pre(do_load, obj, adr, adr_idx, val, val_type, pre_val, bt); |
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1484 break; |
0 | 1485 |
1486 case BarrierSet::CardTableModRef: | |
1487 case BarrierSet::CardTableExtension: | |
1488 case BarrierSet::ModRef: | |
1489 break; | |
1490 | |
1491 case BarrierSet::Other: | |
1492 default : | |
1493 ShouldNotReachHere(); | |
1494 | |
1495 } | |
1496 } | |
1497 | |
1498 void GraphKit::post_barrier(Node* ctl, | |
1499 Node* store, | |
1500 Node* obj, | |
1501 Node* adr, | |
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1502 uint adr_idx, |
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1503 Node* val, |
0 | 1504 BasicType bt, |
1505 bool use_precise) { | |
1506 BarrierSet* bs = Universe::heap()->barrier_set(); | |
1507 set_control(ctl); | |
1508 switch (bs->kind()) { | |
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1509 case BarrierSet::G1SATBCT: |
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1510 case BarrierSet::G1SATBCTLogging: |
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1511 g1_write_barrier_post(store, obj, adr, adr_idx, val, bt, use_precise); |
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1512 break; |
0 | 1513 |
1514 case BarrierSet::CardTableModRef: | |
1515 case BarrierSet::CardTableExtension: | |
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1516 write_barrier_post(store, obj, adr, adr_idx, val, use_precise); |
0 | 1517 break; |
1518 | |
1519 case BarrierSet::ModRef: | |
1520 break; | |
1521 | |
1522 case BarrierSet::Other: | |
1523 default : | |
1524 ShouldNotReachHere(); | |
1525 | |
1526 } | |
1527 } | |
1528 | |
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1529 Node* GraphKit::store_oop(Node* ctl, |
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1530 Node* obj, |
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1531 Node* adr, |
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1532 const TypePtr* adr_type, |
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1533 Node* val, |
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1534 const TypeOopPtr* val_type, |
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1535 BasicType bt, |
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1536 bool use_precise) { |
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1537 // Transformation of a value which could be NULL pointer (CastPP #NULL) |
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1538 // could be delayed during Parse (for example, in adjust_map_after_if()). |
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1539 // Execute transformation here to avoid barrier generation in such case. |
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1540 if (_gvn.type(val) == TypePtr::NULL_PTR) |
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1541 val = _gvn.makecon(TypePtr::NULL_PTR); |
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1542 |
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1543 set_control(ctl); |
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1544 if (stopped()) return top(); // Dead path ? |
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1545 |
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1546 assert(bt == T_OBJECT, "sanity"); |
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1547 assert(val != NULL, "not dead path"); |
0 | 1548 uint adr_idx = C->get_alias_index(adr_type); |
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1549 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); |
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1550 |
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1551 pre_barrier(true /* do_load */, |
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1552 control(), obj, adr, adr_idx, val, val_type, |
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1553 NULL /* pre_val */, |
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1554 bt); |
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1555 |
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1556 Node* store = store_to_memory(control(), adr, val, bt, adr_idx); |
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1557 post_barrier(control(), store, obj, adr, adr_idx, val, bt, use_precise); |
0 | 1558 return store; |
1559 } | |
1560 | |
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1561 // Could be an array or object we don't know at compile time (unsafe ref.) |
0 | 1562 Node* GraphKit::store_oop_to_unknown(Node* ctl, |
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1563 Node* obj, // containing obj |
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1564 Node* adr, // actual adress to store val at |
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1565 const TypePtr* adr_type, |
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1566 Node* val, |
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1567 BasicType bt) { |
825 | 1568 Compile::AliasType* at = C->alias_type(adr_type); |
1569 const TypeOopPtr* val_type = NULL; | |
1570 if (adr_type->isa_instptr()) { | |
1571 if (at->field() != NULL) { | |
1572 // known field. This code is a copy of the do_put_xxx logic. | |
1573 ciField* field = at->field(); | |
1574 if (!field->type()->is_loaded()) { | |
1575 val_type = TypeInstPtr::BOTTOM; | |
1576 } else { | |
1577 val_type = TypeOopPtr::make_from_klass(field->type()->as_klass()); | |
1578 } | |
1579 } | |
1580 } else if (adr_type->isa_aryptr()) { | |
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1581 val_type = adr_type->is_aryptr()->elem()->make_oopptr(); |
825 | 1582 } |
1583 if (val_type == NULL) { | |
1584 val_type = TypeInstPtr::BOTTOM; | |
1585 } | |
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1586 return store_oop(ctl, obj, adr, adr_type, val, val_type, bt, true); |
0 | 1587 } |
1588 | |
1589 | |
1590 //-------------------------array_element_address------------------------- | |
1591 Node* GraphKit::array_element_address(Node* ary, Node* idx, BasicType elembt, | |
1592 const TypeInt* sizetype) { | |
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1593 uint shift = exact_log2(type2aelembytes(elembt)); |
0 | 1594 uint header = arrayOopDesc::base_offset_in_bytes(elembt); |
1595 | |
1596 // short-circuit a common case (saves lots of confusing waste motion) | |
1597 jint idx_con = find_int_con(idx, -1); | |
1598 if (idx_con >= 0) { | |
1599 intptr_t offset = header + ((intptr_t)idx_con << shift); | |
1600 return basic_plus_adr(ary, offset); | |
1601 } | |
1602 | |
1603 // must be correct type for alignment purposes | |
1604 Node* base = basic_plus_adr(ary, header); | |
1605 #ifdef _LP64 | |
1606 // The scaled index operand to AddP must be a clean 64-bit value. | |
1607 // Java allows a 32-bit int to be incremented to a negative | |
1608 // value, which appears in a 64-bit register as a large | |
1609 // positive number. Using that large positive number as an | |
1610 // operand in pointer arithmetic has bad consequences. | |
1611 // On the other hand, 32-bit overflow is rare, and the possibility | |
1612 // can often be excluded, if we annotate the ConvI2L node with | |
1613 // a type assertion that its value is known to be a small positive | |
1614 // number. (The prior range check has ensured this.) | |
1615 // This assertion is used by ConvI2LNode::Ideal. | |
1616 int index_max = max_jint - 1; // array size is max_jint, index is one less | |
1617 if (sizetype != NULL) index_max = sizetype->_hi - 1; | |
1618 const TypeLong* lidxtype = TypeLong::make(CONST64(0), index_max, Type::WidenMax); | |
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1619 idx = _gvn.transform( new (C) ConvI2LNode(idx, lidxtype) ); |
0 | 1620 #endif |
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1621 Node* scale = _gvn.transform( new (C) LShiftXNode(idx, intcon(shift)) ); |
0 | 1622 return basic_plus_adr(ary, base, scale); |
1623 } | |
1624 | |
1625 //-------------------------load_array_element------------------------- | |
1626 Node* GraphKit::load_array_element(Node* ctl, Node* ary, Node* idx, const TypeAryPtr* arytype) { | |
1627 const Type* elemtype = arytype->elem(); | |
1628 BasicType elembt = elemtype->array_element_basic_type(); | |
1629 Node* adr = array_element_address(ary, idx, elembt, arytype->size()); | |
1630 Node* ld = make_load(ctl, adr, elemtype, elembt, arytype); | |
1631 return ld; | |
1632 } | |
1633 | |
1634 //-------------------------set_arguments_for_java_call------------------------- | |
1635 // Arguments (pre-popped from the stack) are taken from the JVMS. | |
1636 void GraphKit::set_arguments_for_java_call(CallJavaNode* call) { | |
1637 // Add the call arguments: | |
1638 uint nargs = call->method()->arg_size(); | |
1639 for (uint i = 0; i < nargs; i++) { | |
1640 Node* arg = argument(i); | |
1641 call->init_req(i + TypeFunc::Parms, arg); | |
1642 } | |
1643 } | |
1644 | |
1645 //---------------------------set_edges_for_java_call--------------------------- | |
1646 // Connect a newly created call into the current JVMS. | |
1647 // A return value node (if any) is returned from set_edges_for_java_call. | |
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1648 void GraphKit::set_edges_for_java_call(CallJavaNode* call, bool must_throw, bool separate_io_proj) { |
0 | 1649 |
1650 // Add the predefined inputs: | |
1651 call->init_req( TypeFunc::Control, control() ); | |
1652 call->init_req( TypeFunc::I_O , i_o() ); | |
1653 call->init_req( TypeFunc::Memory , reset_memory() ); | |
1654 call->init_req( TypeFunc::FramePtr, frameptr() ); | |
1655 call->init_req( TypeFunc::ReturnAdr, top() ); | |
1656 | |
1657 add_safepoint_edges(call, must_throw); | |
1658 | |
1659 Node* xcall = _gvn.transform(call); | |
1660 | |
1661 if (xcall == top()) { | |
1662 set_control(top()); | |
1663 return; | |
1664 } | |
1665 assert(xcall == call, "call identity is stable"); | |
1666 | |
1667 // Re-use the current map to produce the result. | |
1668 | |
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1669 set_control(_gvn.transform(new (C) ProjNode(call, TypeFunc::Control))); |
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1670 set_i_o( _gvn.transform(new (C) ProjNode(call, TypeFunc::I_O , separate_io_proj))); |
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1671 set_all_memory_call(xcall, separate_io_proj); |
0 | 1672 |
1673 //return xcall; // no need, caller already has it | |
1674 } | |
1675 | |
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1676 Node* GraphKit::set_results_for_java_call(CallJavaNode* call, bool separate_io_proj) { |
0 | 1677 if (stopped()) return top(); // maybe the call folded up? |
1678 | |
1679 // Capture the return value, if any. | |
1680 Node* ret; | |
1681 if (call->method() == NULL || | |
1682 call->method()->return_type()->basic_type() == T_VOID) | |
1683 ret = top(); | |
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1684 else ret = _gvn.transform(new (C) ProjNode(call, TypeFunc::Parms)); |
0 | 1685 |
1686 // Note: Since any out-of-line call can produce an exception, | |
1687 // we always insert an I_O projection from the call into the result. | |
1688 | |
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1689 make_slow_call_ex(call, env()->Throwable_klass(), separate_io_proj); |
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1690 |
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1691 if (separate_io_proj) { |
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1692 // The caller requested separate projections be used by the fall |
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1693 // through and exceptional paths, so replace the projections for |
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1694 // the fall through path. |
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1695 set_i_o(_gvn.transform( new (C) ProjNode(call, TypeFunc::I_O) )); |
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1696 set_all_memory(_gvn.transform( new (C) ProjNode(call, TypeFunc::Memory) )); |
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1697 } |
0 | 1698 return ret; |
1699 } | |
1700 | |
1701 //--------------------set_predefined_input_for_runtime_call-------------------- | |
1702 // Reading and setting the memory state is way conservative here. | |
1703 // The real problem is that I am not doing real Type analysis on memory, | |
1704 // so I cannot distinguish card mark stores from other stores. Across a GC | |
1705 // point the Store Barrier and the card mark memory has to agree. I cannot | |
1706 // have a card mark store and its barrier split across the GC point from | |
1707 // either above or below. Here I get that to happen by reading ALL of memory. | |
1708 // A better answer would be to separate out card marks from other memory. | |
1709 // For now, return the input memory state, so that it can be reused | |
1710 // after the call, if this call has restricted memory effects. | |
1711 Node* GraphKit::set_predefined_input_for_runtime_call(SafePointNode* call) { | |
1712 // Set fixed predefined input arguments | |
1713 Node* memory = reset_memory(); | |
1714 call->init_req( TypeFunc::Control, control() ); | |
1715 call->init_req( TypeFunc::I_O, top() ); // does no i/o | |
1716 call->init_req( TypeFunc::Memory, memory ); // may gc ptrs | |
1717 call->init_req( TypeFunc::FramePtr, frameptr() ); | |
1718 call->init_req( TypeFunc::ReturnAdr, top() ); | |
1719 return memory; | |
1720 } | |
1721 | |
1722 //-------------------set_predefined_output_for_runtime_call-------------------- | |
1723 // Set control and memory (not i_o) from the call. | |
1724 // If keep_mem is not NULL, use it for the output state, | |
1725 // except for the RawPtr output of the call, if hook_mem is TypeRawPtr::BOTTOM. | |
1726 // If hook_mem is NULL, this call produces no memory effects at all. | |
1727 // If hook_mem is a Java-visible memory slice (such as arraycopy operands), | |
1728 // then only that memory slice is taken from the call. | |
1729 // In the last case, we must put an appropriate memory barrier before | |
1730 // the call, so as to create the correct anti-dependencies on loads | |
1731 // preceding the call. | |
1732 void GraphKit::set_predefined_output_for_runtime_call(Node* call, | |
1733 Node* keep_mem, | |
1734 const TypePtr* hook_mem) { | |
1735 // no i/o | |
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1736 set_control(_gvn.transform( new (C) ProjNode(call,TypeFunc::Control) )); |
0 | 1737 if (keep_mem) { |
1738 // First clone the existing memory state | |
1739 set_all_memory(keep_mem); | |
1740 if (hook_mem != NULL) { | |
1741 // Make memory for the call | |
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1742 Node* mem = _gvn.transform( new (C) ProjNode(call, TypeFunc::Memory) ); |
0 | 1743 // Set the RawPtr memory state only. This covers all the heap top/GC stuff |
1744 // We also use hook_mem to extract specific effects from arraycopy stubs. | |
1745 set_memory(mem, hook_mem); | |
1746 } | |
1747 // ...else the call has NO memory effects. | |
1748 | |
1749 // Make sure the call advertises its memory effects precisely. | |
1750 // This lets us build accurate anti-dependences in gcm.cpp. | |
1751 assert(C->alias_type(call->adr_type()) == C->alias_type(hook_mem), | |
1752 "call node must be constructed correctly"); | |
1753 } else { | |
1754 assert(hook_mem == NULL, ""); | |
1755 // This is not a "slow path" call; all memory comes from the call. | |
1756 set_all_memory_call(call); | |
1757 } | |
1758 } | |
1759 | |
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1760 |
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1761 // Replace the call with the current state of the kit. |
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1762 void GraphKit::replace_call(CallNode* call, Node* result) { |
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1763 JVMState* ejvms = NULL; |
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1764 if (has_exceptions()) { |
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1765 ejvms = transfer_exceptions_into_jvms(); |
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1766 } |
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1767 |
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1768 SafePointNode* final_state = stop(); |
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1769 |
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1770 // Find all the needed outputs of this call |
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1771 CallProjections callprojs; |
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1772 call->extract_projections(&callprojs, true); |
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1773 |
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1774 // Replace all the old call edges with the edges from the inlining result |
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1775 C->gvn_replace_by(callprojs.fallthrough_catchproj, final_state->in(TypeFunc::Control)); |
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1776 C->gvn_replace_by(callprojs.fallthrough_memproj, final_state->in(TypeFunc::Memory)); |
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1777 C->gvn_replace_by(callprojs.fallthrough_ioproj, final_state->in(TypeFunc::I_O)); |
1786
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1778 Node* final_mem = final_state->in(TypeFunc::Memory); |
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1779 |
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1780 // Replace the result with the new result if it exists and is used |
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1781 if (callprojs.resproj != NULL && result != NULL) { |
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1782 C->gvn_replace_by(callprojs.resproj, result); |
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1783 } |
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1784 |
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1785 if (ejvms == NULL) { |
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1786 // No exception edges to simply kill off those paths |
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1787 C->gvn_replace_by(callprojs.catchall_catchproj, C->top()); |
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1788 C->gvn_replace_by(callprojs.catchall_memproj, C->top()); |
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1789 C->gvn_replace_by(callprojs.catchall_ioproj, C->top()); |
1099
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1790 |
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1791 // Replace the old exception object with top |
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1792 if (callprojs.exobj != NULL) { |
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1793 C->gvn_replace_by(callprojs.exobj, C->top()); |
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1794 } |
1080
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1795 } else { |
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1796 GraphKit ekit(ejvms); |
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1797 |
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1798 // Load my combined exception state into the kit, with all phis transformed: |
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1799 SafePointNode* ex_map = ekit.combine_and_pop_all_exception_states(); |
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1800 |
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1801 Node* ex_oop = ekit.use_exception_state(ex_map); |
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1802 |
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1803 C->gvn_replace_by(callprojs.catchall_catchproj, ekit.control()); |
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1804 C->gvn_replace_by(callprojs.catchall_memproj, ekit.reset_memory()); |
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1805 C->gvn_replace_by(callprojs.catchall_ioproj, ekit.i_o()); |
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1806 |
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1807 // Replace the old exception object with the newly created one |
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1808 if (callprojs.exobj != NULL) { |
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1809 C->gvn_replace_by(callprojs.exobj, ex_oop); |
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1810 } |
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1811 } |
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1812 |
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1813 // Disconnect the call from the graph |
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1814 call->disconnect_inputs(NULL, C); |
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1815 C->gvn_replace_by(call, C->top()); |
1786
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1816 |
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1817 // Clean up any MergeMems that feed other MergeMems since the |
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1818 // optimizer doesn't like that. |
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1819 if (final_mem->is_MergeMem()) { |
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1820 Node_List wl; |
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1821 for (SimpleDUIterator i(final_mem); i.has_next(); i.next()) { |
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1822 Node* m = i.get(); |
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1823 if (m->is_MergeMem() && !wl.contains(m)) { |
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1824 wl.push(m); |
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1825 } |
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1826 } |
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1827 while (wl.size() > 0) { |
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1828 _gvn.transform(wl.pop()); |
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1829 } |
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1830 } |
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1831 } |
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1832 |
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1833 |
0 | 1834 //------------------------------increment_counter------------------------------ |
1835 // for statistics: increment a VM counter by 1 | |
1836 | |
1837 void GraphKit::increment_counter(address counter_addr) { | |
1838 Node* adr1 = makecon(TypeRawPtr::make(counter_addr)); | |
1839 increment_counter(adr1); | |
1840 } | |
1841 | |
1842 void GraphKit::increment_counter(Node* counter_addr) { | |
1843 int adr_type = Compile::AliasIdxRaw; | |
1609 | 1844 Node* ctrl = control(); |
1845 Node* cnt = make_load(ctrl, counter_addr, TypeInt::INT, T_INT, adr_type); | |
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1846 Node* incr = _gvn.transform(new (C) AddINode(cnt, _gvn.intcon(1))); |
1609 | 1847 store_to_memory( ctrl, counter_addr, incr, T_INT, adr_type ); |
0 | 1848 } |
1849 | |
1850 | |
1851 //------------------------------uncommon_trap---------------------------------- | |
1852 // Bail out to the interpreter in mid-method. Implemented by calling the | |
1853 // uncommon_trap blob. This helper function inserts a runtime call with the | |
1854 // right debug info. | |
1855 void GraphKit::uncommon_trap(int trap_request, | |
1856 ciKlass* klass, const char* comment, | |
1857 bool must_throw, | |
1858 bool keep_exact_action) { | |
1859 if (failing()) stop(); | |
1860 if (stopped()) return; // trap reachable? | |
1861 | |
1862 // Note: If ProfileTraps is true, and if a deopt. actually | |
1863 // occurs here, the runtime will make sure an MDO exists. There is | |
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1864 // no need to call method()->ensure_method_data() at this point. |
0 | 1865 |
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1866 // Set the stack pointer to the right value for reexecution: |
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1867 set_sp(reexecute_sp()); |
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1868 |
0 | 1869 #ifdef ASSERT |
1870 if (!must_throw) { | |
1871 // Make sure the stack has at least enough depth to execute | |
1872 // the current bytecode. | |
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1873 int inputs, ignored_depth; |
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1874 if (compute_stack_effects(inputs, ignored_depth)) { |
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1875 assert(sp() >= inputs, err_msg_res("must have enough JVMS stack to execute %s: sp=%d, inputs=%d", |
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1876 Bytecodes::name(java_bc()), sp(), inputs)); |
0 | 1877 } |
1878 } | |
1879 #endif | |
1880 | |
1881 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request); | |
1882 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request); | |
1883 | |
1884 switch (action) { | |
1885 case Deoptimization::Action_maybe_recompile: | |
1886 case Deoptimization::Action_reinterpret: | |
1887 // Temporary fix for 6529811 to allow virtual calls to be sure they | |
1888 // get the chance to go from mono->bi->mega | |
1889 if (!keep_exact_action && | |
1890 Deoptimization::trap_request_index(trap_request) < 0 && | |
1891 too_many_recompiles(reason)) { | |
1892 // This BCI is causing too many recompilations. | |
1893 action = Deoptimization::Action_none; | |
1894 trap_request = Deoptimization::make_trap_request(reason, action); | |
1895 } else { | |
1896 C->set_trap_can_recompile(true); | |
1897 } | |
1898 break; | |
1899 case Deoptimization::Action_make_not_entrant: | |
1900 C->set_trap_can_recompile(true); | |
1901 break; | |
1902 #ifdef ASSERT | |
1903 case Deoptimization::Action_none: | |
1904 case Deoptimization::Action_make_not_compilable: | |
1905 break; | |
1906 default: | |
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1907 fatal(err_msg_res("unknown action %d: %s", action, Deoptimization::trap_action_name(action))); |
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1908 break; |
0 | 1909 #endif |
1910 } | |
1911 | |
1912 if (TraceOptoParse) { | |
1913 char buf[100]; | |
1914 tty->print_cr("Uncommon trap %s at bci:%d", | |
1915 Deoptimization::format_trap_request(buf, sizeof(buf), | |
1916 trap_request), bci()); | |
1917 } | |
1918 | |
1919 CompileLog* log = C->log(); | |
1920 if (log != NULL) { | |
1921 int kid = (klass == NULL)? -1: log->identify(klass); | |
1922 log->begin_elem("uncommon_trap bci='%d'", bci()); | |
1923 char buf[100]; | |
1924 log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf), | |
1925 trap_request)); | |
1926 if (kid >= 0) log->print(" klass='%d'", kid); | |
1927 if (comment != NULL) log->print(" comment='%s'", comment); | |
1928 log->end_elem(); | |
1929 } | |
1930 | |
1931 // Make sure any guarding test views this path as very unlikely | |
1932 Node *i0 = control()->in(0); | |
1933 if (i0 != NULL && i0->is_If()) { // Found a guarding if test? | |
1934 IfNode *iff = i0->as_If(); | |
1935 float f = iff->_prob; // Get prob | |
1936 if (control()->Opcode() == Op_IfTrue) { | |
1937 if (f > PROB_UNLIKELY_MAG(4)) | |
1938 iff->_prob = PROB_MIN; | |
1939 } else { | |
1940 if (f < PROB_LIKELY_MAG(4)) | |
1941 iff->_prob = PROB_MAX; | |
1942 } | |
1943 } | |
1944 | |
1945 // Clear out dead values from the debug info. | |
1946 kill_dead_locals(); | |
1947 | |
1948 // Now insert the uncommon trap subroutine call | |
1748 | 1949 address call_addr = SharedRuntime::uncommon_trap_blob()->entry_point(); |
0 | 1950 const TypePtr* no_memory_effects = NULL; |
1951 // Pass the index of the class to be loaded | |
1952 Node* call = make_runtime_call(RC_NO_LEAF | RC_UNCOMMON | | |
1953 (must_throw ? RC_MUST_THROW : 0), | |
1954 OptoRuntime::uncommon_trap_Type(), | |
1955 call_addr, "uncommon_trap", no_memory_effects, | |
1956 intcon(trap_request)); | |
1957 assert(call->as_CallStaticJava()->uncommon_trap_request() == trap_request, | |
1958 "must extract request correctly from the graph"); | |
1959 assert(trap_request != 0, "zero value reserved by uncommon_trap_request"); | |
1960 | |
1961 call->set_req(TypeFunc::ReturnAdr, returnadr()); | |
1962 // The debug info is the only real input to this call. | |
1963 | |
1964 // Halt-and-catch fire here. The above call should never return! | |
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1965 HaltNode* halt = new(C) HaltNode(control(), frameptr()); |
0 | 1966 _gvn.set_type_bottom(halt); |
1967 root()->add_req(halt); | |
1968 | |
1969 stop_and_kill_map(); | |
1970 } | |
1971 | |
1972 | |
1973 //--------------------------just_allocated_object------------------------------ | |
1974 // Report the object that was just allocated. | |
1975 // It must be the case that there are no intervening safepoints. | |
1976 // We use this to determine if an object is so "fresh" that | |
1977 // it does not require card marks. | |
1978 Node* GraphKit::just_allocated_object(Node* current_control) { | |
1979 if (C->recent_alloc_ctl() == current_control) | |
1980 return C->recent_alloc_obj(); | |
1981 return NULL; | |
1982 } | |
1983 | |
1984 | |
1985 void GraphKit::round_double_arguments(ciMethod* dest_method) { | |
1986 // (Note: TypeFunc::make has a cache that makes this fast.) | |
1987 const TypeFunc* tf = TypeFunc::make(dest_method); | |
1988 int nargs = tf->_domain->_cnt - TypeFunc::Parms; | |
1989 for (int j = 0; j < nargs; j++) { | |
1990 const Type *targ = tf->_domain->field_at(j + TypeFunc::Parms); | |
1991 if( targ->basic_type() == T_DOUBLE ) { | |
1992 // If any parameters are doubles, they must be rounded before | |
1993 // the call, dstore_rounding does gvn.transform | |
1994 Node *arg = argument(j); | |
1995 arg = dstore_rounding(arg); | |
1996 set_argument(j, arg); | |
1997 } | |
1998 } | |
1999 } | |
2000 | |
2001 void GraphKit::round_double_result(ciMethod* dest_method) { | |
2002 // A non-strict method may return a double value which has an extended | |
2003 // exponent, but this must not be visible in a caller which is 'strict' | |
2004 // If a strict caller invokes a non-strict callee, round a double result | |
2005 | |
2006 BasicType result_type = dest_method->return_type()->basic_type(); | |
2007 assert( method() != NULL, "must have caller context"); | |
2008 if( result_type == T_DOUBLE && method()->is_strict() && !dest_method->is_strict() ) { | |
2009 // Destination method's return value is on top of stack | |
2010 // dstore_rounding() does gvn.transform | |
2011 Node *result = pop_pair(); | |
2012 result = dstore_rounding(result); | |
2013 push_pair(result); | |
2014 } | |
2015 } | |
2016 | |
2017 // rounding for strict float precision conformance | |
2018 Node* GraphKit::precision_rounding(Node* n) { | |
2019 return UseStrictFP && _method->flags().is_strict() | |
2020 && UseSSE == 0 && Matcher::strict_fp_requires_explicit_rounding | |
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2021 ? _gvn.transform( new (C) RoundFloatNode(0, n) ) |
0 | 2022 : n; |
2023 } | |
2024 | |
2025 // rounding for strict double precision conformance | |
2026 Node* GraphKit::dprecision_rounding(Node *n) { | |
2027 return UseStrictFP && _method->flags().is_strict() | |
2028 && UseSSE <= 1 && Matcher::strict_fp_requires_explicit_rounding | |
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2029 ? _gvn.transform( new (C) RoundDoubleNode(0, n) ) |
0 | 2030 : n; |
2031 } | |
2032 | |
2033 // rounding for non-strict double stores | |
2034 Node* GraphKit::dstore_rounding(Node* n) { | |
2035 return Matcher::strict_fp_requires_explicit_rounding | |
2036 && UseSSE <= 1 | |
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2037 ? _gvn.transform( new (C) RoundDoubleNode(0, n) ) |
0 | 2038 : n; |
2039 } | |
2040 | |
2041 //============================================================================= | |
2042 // Generate a fast path/slow path idiom. Graph looks like: | |
2043 // [foo] indicates that 'foo' is a parameter | |
2044 // | |
2045 // [in] NULL | |
2046 // \ / | |
2047 // CmpP | |
2048 // Bool ne | |
2049 // If | |
2050 // / \ | |
2051 // True False-<2> | |
2052 // / | | |
2053 // / cast_not_null | |
2054 // Load | | ^ | |
2055 // [fast_test] | | | |
2056 // gvn to opt_test | | | |
2057 // / \ | <1> | |
2058 // True False | | |
2059 // | \\ | | |
2060 // [slow_call] \[fast_result] | |
2061 // Ctl Val \ \ | |
2062 // | \ \ | |
2063 // Catch <1> \ \ | |
2064 // / \ ^ \ \ | |
2065 // Ex No_Ex | \ \ | |
2066 // | \ \ | \ <2> \ | |
2067 // ... \ [slow_res] | | \ [null_result] | |
2068 // \ \--+--+--- | | | |
2069 // \ | / \ | / | |
2070 // --------Region Phi | |
2071 // | |
2072 //============================================================================= | |
2073 // Code is structured as a series of driver functions all called 'do_XXX' that | |
2074 // call a set of helper functions. Helper functions first, then drivers. | |
2075 | |
2076 //------------------------------null_check_oop--------------------------------- | |
2077 // Null check oop. Set null-path control into Region in slot 3. | |
2078 // Make a cast-not-nullness use the other not-null control. Return cast. | |
2079 Node* GraphKit::null_check_oop(Node* value, Node* *null_control, | |
2080 bool never_see_null) { | |
2081 // Initial NULL check taken path | |
2082 (*null_control) = top(); | |
2083 Node* cast = null_check_common(value, T_OBJECT, false, null_control); | |
2084 | |
2085 // Generate uncommon_trap: | |
2086 if (never_see_null && (*null_control) != top()) { | |
2087 // If we see an unexpected null at a check-cast we record it and force a | |
2088 // recompile; the offending check-cast will be compiled to handle NULLs. | |
2089 // If we see more than one offending BCI, then all checkcasts in the | |
2090 // method will be compiled to handle NULLs. | |
2091 PreserveJVMState pjvms(this); | |
2092 set_control(*null_control); | |
332 | 2093 replace_in_map(value, null()); |
0 | 2094 uncommon_trap(Deoptimization::Reason_null_check, |
2095 Deoptimization::Action_make_not_entrant); | |
2096 (*null_control) = top(); // NULL path is dead | |
2097 } | |
2098 | |
2099 // Cast away null-ness on the result | |
2100 return cast; | |
2101 } | |
2102 | |
2103 //------------------------------opt_iff---------------------------------------- | |
2104 // Optimize the fast-check IfNode. Set the fast-path region slot 2. | |
2105 // Return slow-path control. | |
2106 Node* GraphKit::opt_iff(Node* region, Node* iff) { | |
2107 IfNode *opt_iff = _gvn.transform(iff)->as_If(); | |
2108 | |
2109 // Fast path taken; set region slot 2 | |
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2110 Node *fast_taken = _gvn.transform( new (C) IfFalseNode(opt_iff) ); |
0 | 2111 region->init_req(2,fast_taken); // Capture fast-control |
2112 | |
2113 // Fast path not-taken, i.e. slow path | |
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2114 Node *slow_taken = _gvn.transform( new (C) IfTrueNode(opt_iff) ); |
0 | 2115 return slow_taken; |
2116 } | |
2117 | |
2118 //-----------------------------make_runtime_call------------------------------- | |
2119 Node* GraphKit::make_runtime_call(int flags, | |
2120 const TypeFunc* call_type, address call_addr, | |
2121 const char* call_name, | |
2122 const TypePtr* adr_type, | |
2123 // The following parms are all optional. | |
2124 // The first NULL ends the list. | |
2125 Node* parm0, Node* parm1, | |
2126 Node* parm2, Node* parm3, | |
2127 Node* parm4, Node* parm5, | |
2128 Node* parm6, Node* parm7) { | |
2129 // Slow-path call | |
2130 bool is_leaf = !(flags & RC_NO_LEAF); | |
2131 bool has_io = (!is_leaf && !(flags & RC_NO_IO)); | |
2132 if (call_name == NULL) { | |
2133 assert(!is_leaf, "must supply name for leaf"); | |
2134 call_name = OptoRuntime::stub_name(call_addr); | |
2135 } | |
2136 CallNode* call; | |
2137 if (!is_leaf) { | |
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2138 call = new(C) CallStaticJavaNode(call_type, call_addr, call_name, |
0 | 2139 bci(), adr_type); |
2140 } else if (flags & RC_NO_FP) { | |
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2141 call = new(C) CallLeafNoFPNode(call_type, call_addr, call_name, adr_type); |
0 | 2142 } else { |
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2143 call = new(C) CallLeafNode(call_type, call_addr, call_name, adr_type); |
0 | 2144 } |
2145 | |
2146 // The following is similar to set_edges_for_java_call, | |
2147 // except that the memory effects of the call are restricted to AliasIdxRaw. | |
2148 | |
2149 // Slow path call has no side-effects, uses few values | |
2150 bool wide_in = !(flags & RC_NARROW_MEM); | |
2151 bool wide_out = (C->get_alias_index(adr_type) == Compile::AliasIdxBot); | |
2152 | |
2153 Node* prev_mem = NULL; | |
2154 if (wide_in) { | |
2155 prev_mem = set_predefined_input_for_runtime_call(call); | |
2156 } else { | |
2157 assert(!wide_out, "narrow in => narrow out"); | |
2158 Node* narrow_mem = memory(adr_type); | |
2159 prev_mem = reset_memory(); | |
2160 map()->set_memory(narrow_mem); | |
2161 set_predefined_input_for_runtime_call(call); | |
2162 } | |
2163 | |
2164 // Hook each parm in order. Stop looking at the first NULL. | |
2165 if (parm0 != NULL) { call->init_req(TypeFunc::Parms+0, parm0); | |
2166 if (parm1 != NULL) { call->init_req(TypeFunc::Parms+1, parm1); | |
2167 if (parm2 != NULL) { call->init_req(TypeFunc::Parms+2, parm2); | |
2168 if (parm3 != NULL) { call->init_req(TypeFunc::Parms+3, parm3); | |
2169 if (parm4 != NULL) { call->init_req(TypeFunc::Parms+4, parm4); | |
2170 if (parm5 != NULL) { call->init_req(TypeFunc::Parms+5, parm5); | |
2171 if (parm6 != NULL) { call->init_req(TypeFunc::Parms+6, parm6); | |
2172 if (parm7 != NULL) { call->init_req(TypeFunc::Parms+7, parm7); | |
2173 /* close each nested if ===> */ } } } } } } } } | |
2174 assert(call->in(call->req()-1) != NULL, "must initialize all parms"); | |
2175 | |
2176 if (!is_leaf) { | |
2177 // Non-leaves can block and take safepoints: | |
2178 add_safepoint_edges(call, ((flags & RC_MUST_THROW) != 0)); | |
2179 } | |
2180 // Non-leaves can throw exceptions: | |
2181 if (has_io) { | |
2182 call->set_req(TypeFunc::I_O, i_o()); | |
2183 } | |
2184 | |
2185 if (flags & RC_UNCOMMON) { | |
2186 // Set the count to a tiny probability. Cf. Estimate_Block_Frequency. | |
2187 // (An "if" probability corresponds roughly to an unconditional count. | |
2188 // Sort of.) | |
2189 call->set_cnt(PROB_UNLIKELY_MAG(4)); | |
2190 } | |
2191 | |
2192 Node* c = _gvn.transform(call); | |
2193 assert(c == call, "cannot disappear"); | |
2194 | |
2195 if (wide_out) { | |
2196 // Slow path call has full side-effects. | |
2197 set_predefined_output_for_runtime_call(call); | |
2198 } else { | |
2199 // Slow path call has few side-effects, and/or sets few values. | |
2200 set_predefined_output_for_runtime_call(call, prev_mem, adr_type); | |
2201 } | |
2202 | |
2203 if (has_io) { | |
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2204 set_i_o(_gvn.transform(new (C) ProjNode(call, TypeFunc::I_O))); |
0 | 2205 } |
2206 return call; | |
2207 | |
2208 } | |
2209 | |
2210 //------------------------------merge_memory----------------------------------- | |
2211 // Merge memory from one path into the current memory state. | |
2212 void GraphKit::merge_memory(Node* new_mem, Node* region, int new_path) { | |
2213 for (MergeMemStream mms(merged_memory(), new_mem->as_MergeMem()); mms.next_non_empty2(); ) { | |
2214 Node* old_slice = mms.force_memory(); | |
2215 Node* new_slice = mms.memory2(); | |
2216 if (old_slice != new_slice) { | |
2217 PhiNode* phi; | |
2218 if (new_slice->is_Phi() && new_slice->as_Phi()->region() == region) { | |
2219 phi = new_slice->as_Phi(); | |
2220 #ifdef ASSERT | |
2221 if (old_slice->is_Phi() && old_slice->as_Phi()->region() == region) | |
2222 old_slice = old_slice->in(new_path); | |
2223 // Caller is responsible for ensuring that any pre-existing | |
2224 // phis are already aware of old memory. | |
2225 int old_path = (new_path > 1) ? 1 : 2; // choose old_path != new_path | |
2226 assert(phi->in(old_path) == old_slice, "pre-existing phis OK"); | |
2227 #endif | |
2228 mms.set_memory(phi); | |
2229 } else { | |
2230 phi = PhiNode::make(region, old_slice, Type::MEMORY, mms.adr_type(C)); | |
2231 _gvn.set_type(phi, Type::MEMORY); | |
2232 phi->set_req(new_path, new_slice); | |
2233 mms.set_memory(_gvn.transform(phi)); // assume it is complete | |
2234 } | |
2235 } | |
2236 } | |
2237 } | |
2238 | |
2239 //------------------------------make_slow_call_ex------------------------------ | |
2240 // Make the exception handler hookups for the slow call | |
2241 void GraphKit::make_slow_call_ex(Node* call, ciInstanceKlass* ex_klass, bool separate_io_proj) { | |
2242 if (stopped()) return; | |
2243 | |
2244 // Make a catch node with just two handlers: fall-through and catch-all | |
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2245 Node* i_o = _gvn.transform( new (C) ProjNode(call, TypeFunc::I_O, separate_io_proj) ); |
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2246 Node* catc = _gvn.transform( new (C) CatchNode(control(), i_o, 2) ); |
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2247 Node* norm = _gvn.transform( new (C) CatchProjNode(catc, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci) ); |
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2248 Node* excp = _gvn.transform( new (C) CatchProjNode(catc, CatchProjNode::catch_all_index, CatchProjNode::no_handler_bci) ); |
0 | 2249 |
2250 { PreserveJVMState pjvms(this); | |
2251 set_control(excp); | |
2252 set_i_o(i_o); | |
2253 | |
2254 if (excp != top()) { | |
2255 // Create an exception state also. | |
2256 // Use an exact type if the caller has specified a specific exception. | |
2257 const Type* ex_type = TypeOopPtr::make_from_klass_unique(ex_klass)->cast_to_ptr_type(TypePtr::NotNull); | |
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2258 Node* ex_oop = new (C) CreateExNode(ex_type, control(), i_o); |
0 | 2259 add_exception_state(make_exception_state(_gvn.transform(ex_oop))); |
2260 } | |
2261 } | |
2262 | |
2263 // Get the no-exception control from the CatchNode. | |
2264 set_control(norm); | |
2265 } | |
2266 | |
2267 | |
2268 //-------------------------------gen_subtype_check----------------------------- | |
2269 // Generate a subtyping check. Takes as input the subtype and supertype. | |
2270 // Returns 2 values: sets the default control() to the true path and returns | |
2271 // the false path. Only reads invariant memory; sets no (visible) memory. | |
2272 // The PartialSubtypeCheckNode sets the hidden 1-word cache in the encoding | |
2273 // but that's not exposed to the optimizer. This call also doesn't take in an | |
2274 // Object; if you wish to check an Object you need to load the Object's class | |
2275 // prior to coming here. | |
2276 Node* GraphKit::gen_subtype_check(Node* subklass, Node* superklass) { | |
2277 // Fast check for identical types, perhaps identical constants. | |
2278 // The types can even be identical non-constants, in cases | |
2279 // involving Array.newInstance, Object.clone, etc. | |
2280 if (subklass == superklass) | |
2281 return top(); // false path is dead; no test needed. | |
2282 | |
2283 if (_gvn.type(superklass)->singleton()) { | |
2284 ciKlass* superk = _gvn.type(superklass)->is_klassptr()->klass(); | |
2285 ciKlass* subk = _gvn.type(subklass)->is_klassptr()->klass(); | |
2286 | |
2287 // In the common case of an exact superklass, try to fold up the | |
2288 // test before generating code. You may ask, why not just generate | |
2289 // the code and then let it fold up? The answer is that the generated | |
2290 // code will necessarily include null checks, which do not always | |
2291 // completely fold away. If they are also needless, then they turn | |
2292 // into a performance loss. Example: | |
2293 // Foo[] fa = blah(); Foo x = fa[0]; fa[1] = x; | |
2294 // Here, the type of 'fa' is often exact, so the store check | |
2295 // of fa[1]=x will fold up, without testing the nullness of x. | |
2296 switch (static_subtype_check(superk, subk)) { | |
2297 case SSC_always_false: | |
2298 { | |
2299 Node* always_fail = control(); | |
2300 set_control(top()); | |
2301 return always_fail; | |
2302 } | |
2303 case SSC_always_true: | |
2304 return top(); | |
2305 case SSC_easy_test: | |
2306 { | |
2307 // Just do a direct pointer compare and be done. | |
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2308 Node* cmp = _gvn.transform( new(C) CmpPNode(subklass, superklass) ); |
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2309 Node* bol = _gvn.transform( new(C) BoolNode(cmp, BoolTest::eq) ); |
0 | 2310 IfNode* iff = create_and_xform_if(control(), bol, PROB_STATIC_FREQUENT, COUNT_UNKNOWN); |
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2311 set_control( _gvn.transform( new(C) IfTrueNode (iff) ) ); |
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2312 return _gvn.transform( new(C) IfFalseNode(iff) ); |
0 | 2313 } |
2314 case SSC_full_test: | |
2315 break; | |
2316 default: | |
2317 ShouldNotReachHere(); | |
2318 } | |
2319 } | |
2320 | |
2321 // %%% Possible further optimization: Even if the superklass is not exact, | |
2322 // if the subklass is the unique subtype of the superklass, the check | |
2323 // will always succeed. We could leave a dependency behind to ensure this. | |
2324 | |
2325 // First load the super-klass's check-offset | |
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2326 Node *p1 = basic_plus_adr( superklass, superklass, in_bytes(Klass::super_check_offset_offset()) ); |
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2327 Node *chk_off = _gvn.transform( new (C) LoadINode( NULL, memory(p1), p1, _gvn.type(p1)->is_ptr() ) ); |
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2328 int cacheoff_con = in_bytes(Klass::secondary_super_cache_offset()); |
0 | 2329 bool might_be_cache = (find_int_con(chk_off, cacheoff_con) == cacheoff_con); |
2330 | |
2331 // Load from the sub-klass's super-class display list, or a 1-word cache of | |
2332 // the secondary superclass list, or a failing value with a sentinel offset | |
2333 // if the super-klass is an interface or exceptionally deep in the Java | |
2334 // hierarchy and we have to scan the secondary superclass list the hard way. | |
2335 // Worst-case type is a little odd: NULL is allowed as a result (usually | |
2336 // klass loads can never produce a NULL). | |
2337 Node *chk_off_X = ConvI2X(chk_off); | |
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2338 Node *p2 = _gvn.transform( new (C) AddPNode(subklass,subklass,chk_off_X) ); |
0 | 2339 // For some types like interfaces the following loadKlass is from a 1-word |
2340 // cache which is mutable so can't use immutable memory. Other | |
2341 // types load from the super-class display table which is immutable. | |
2342 Node *kmem = might_be_cache ? memory(p2) : immutable_memory(); | |
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2343 Node *nkls = _gvn.transform( LoadKlassNode::make( _gvn, kmem, p2, _gvn.type(p2)->is_ptr(), TypeKlassPtr::OBJECT_OR_NULL ) ); |
0 | 2344 |
2345 // Compile speed common case: ARE a subtype and we canNOT fail | |
2346 if( superklass == nkls ) | |
2347 return top(); // false path is dead; no test needed. | |
2348 | |
2349 // See if we get an immediate positive hit. Happens roughly 83% of the | |
2350 // time. Test to see if the value loaded just previously from the subklass | |
2351 // is exactly the superklass. | |
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2352 Node *cmp1 = _gvn.transform( new (C) CmpPNode( superklass, nkls ) ); |
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2353 Node *bol1 = _gvn.transform( new (C) BoolNode( cmp1, BoolTest::eq ) ); |
0 | 2354 IfNode *iff1 = create_and_xform_if( control(), bol1, PROB_LIKELY(0.83f), COUNT_UNKNOWN ); |
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2355 Node *iftrue1 = _gvn.transform( new (C) IfTrueNode ( iff1 ) ); |
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2356 set_control( _gvn.transform( new (C) IfFalseNode( iff1 ) ) ); |
0 | 2357 |
2358 // Compile speed common case: Check for being deterministic right now. If | |
2359 // chk_off is a constant and not equal to cacheoff then we are NOT a | |
2360 // subklass. In this case we need exactly the 1 test above and we can | |
2361 // return those results immediately. | |
2362 if (!might_be_cache) { | |
2363 Node* not_subtype_ctrl = control(); | |
2364 set_control(iftrue1); // We need exactly the 1 test above | |
2365 return not_subtype_ctrl; | |
2366 } | |
2367 | |
2368 // Gather the various success & failures here | |
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2369 RegionNode *r_ok_subtype = new (C) RegionNode(4); |
0 | 2370 record_for_igvn(r_ok_subtype); |
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2371 RegionNode *r_not_subtype = new (C) RegionNode(3); |
0 | 2372 record_for_igvn(r_not_subtype); |
2373 | |
2374 r_ok_subtype->init_req(1, iftrue1); | |
2375 | |
2376 // Check for immediate negative hit. Happens roughly 11% of the time (which | |
2377 // is roughly 63% of the remaining cases). Test to see if the loaded | |
2378 // check-offset points into the subklass display list or the 1-element | |
2379 // cache. If it points to the display (and NOT the cache) and the display | |
2380 // missed then it's not a subtype. | |
2381 Node *cacheoff = _gvn.intcon(cacheoff_con); | |
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2382 Node *cmp2 = _gvn.transform( new (C) CmpINode( chk_off, cacheoff ) ); |
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2383 Node *bol2 = _gvn.transform( new (C) BoolNode( cmp2, BoolTest::ne ) ); |
0 | 2384 IfNode *iff2 = create_and_xform_if( control(), bol2, PROB_LIKELY(0.63f), COUNT_UNKNOWN ); |
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2385 r_not_subtype->init_req(1, _gvn.transform( new (C) IfTrueNode (iff2) ) ); |
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2386 set_control( _gvn.transform( new (C) IfFalseNode(iff2) ) ); |
0 | 2387 |
644
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2388 // Check for self. Very rare to get here, but it is taken 1/3 the time. |
0 | 2389 // No performance impact (too rare) but allows sharing of secondary arrays |
2390 // which has some footprint reduction. | |
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2391 Node *cmp3 = _gvn.transform( new (C) CmpPNode( subklass, superklass ) ); |
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2392 Node *bol3 = _gvn.transform( new (C) BoolNode( cmp3, BoolTest::eq ) ); |
0 | 2393 IfNode *iff3 = create_and_xform_if( control(), bol3, PROB_LIKELY(0.36f), COUNT_UNKNOWN ); |
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2394 r_ok_subtype->init_req(2, _gvn.transform( new (C) IfTrueNode ( iff3 ) ) ); |
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2395 set_control( _gvn.transform( new (C) IfFalseNode( iff3 ) ) ); |
0 | 2396 |
644
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2397 // -- Roads not taken here: -- |
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2398 // We could also have chosen to perform the self-check at the beginning |
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2399 // of this code sequence, as the assembler does. This would not pay off |
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2400 // the same way, since the optimizer, unlike the assembler, can perform |
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2401 // static type analysis to fold away many successful self-checks. |
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2402 // Non-foldable self checks work better here in second position, because |
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2403 // the initial primary superclass check subsumes a self-check for most |
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2404 // types. An exception would be a secondary type like array-of-interface, |
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2405 // which does not appear in its own primary supertype display. |
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2406 // Finally, we could have chosen to move the self-check into the |
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2407 // PartialSubtypeCheckNode, and from there out-of-line in a platform |
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2408 // dependent manner. But it is worthwhile to have the check here, |
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2409 // where it can be perhaps be optimized. The cost in code space is |
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2410 // small (register compare, branch). |
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2411 |
0 | 2412 // Now do a linear scan of the secondary super-klass array. Again, no real |
2413 // performance impact (too rare) but it's gotta be done. | |
2414 // Since the code is rarely used, there is no penalty for moving it | |
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2415 // out of line, and it can only improve I-cache density. |
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2416 // The decision to inline or out-of-line this final check is platform |
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2417 // dependent, and is found in the AD file definition of PartialSubtypeCheck. |
0 | 2418 Node* psc = _gvn.transform( |
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2419 new (C) PartialSubtypeCheckNode(control(), subklass, superklass) ); |
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2420 |
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2421 Node *cmp4 = _gvn.transform( new (C) CmpPNode( psc, null() ) ); |
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2422 Node *bol4 = _gvn.transform( new (C) BoolNode( cmp4, BoolTest::ne ) ); |
0 | 2423 IfNode *iff4 = create_and_xform_if( control(), bol4, PROB_FAIR, COUNT_UNKNOWN ); |
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2424 r_not_subtype->init_req(2, _gvn.transform( new (C) IfTrueNode (iff4) ) ); |
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2425 r_ok_subtype ->init_req(3, _gvn.transform( new (C) IfFalseNode(iff4) ) ); |
0 | 2426 |
2427 // Return false path; set default control to true path. | |
2428 set_control( _gvn.transform(r_ok_subtype) ); | |
2429 return _gvn.transform(r_not_subtype); | |
2430 } | |
2431 | |
2432 //----------------------------static_subtype_check----------------------------- | |
2433 // Shortcut important common cases when superklass is exact: | |
2434 // (0) superklass is java.lang.Object (can occur in reflective code) | |
2435 // (1) subklass is already limited to a subtype of superklass => always ok | |
2436 // (2) subklass does not overlap with superklass => always fail | |
2437 // (3) superklass has NO subtypes and we can check with a simple compare. | |
2438 int GraphKit::static_subtype_check(ciKlass* superk, ciKlass* subk) { | |
2439 if (StressReflectiveCode) { | |
2440 return SSC_full_test; // Let caller generate the general case. | |
2441 } | |
2442 | |
2443 if (superk == env()->Object_klass()) { | |
2444 return SSC_always_true; // (0) this test cannot fail | |
2445 } | |
2446 | |
2447 ciType* superelem = superk; | |
2448 if (superelem->is_array_klass()) | |
2449 superelem = superelem->as_array_klass()->base_element_type(); | |
2450 | |
2451 if (!subk->is_interface()) { // cannot trust static interface types yet | |
2452 if (subk->is_subtype_of(superk)) { | |
2453 return SSC_always_true; // (1) false path dead; no dynamic test needed | |
2454 } | |
2455 if (!(superelem->is_klass() && superelem->as_klass()->is_interface()) && | |
2456 !superk->is_subtype_of(subk)) { | |
2457 return SSC_always_false; | |
2458 } | |
2459 } | |
2460 | |
2461 // If casting to an instance klass, it must have no subtypes | |
2462 if (superk->is_interface()) { | |
2463 // Cannot trust interfaces yet. | |
2464 // %%% S.B. superk->nof_implementors() == 1 | |
2465 } else if (superelem->is_instance_klass()) { | |
2466 ciInstanceKlass* ik = superelem->as_instance_klass(); | |
2467 if (!ik->has_subklass() && !ik->is_interface()) { | |
2468 if (!ik->is_final()) { | |
2469 // Add a dependency if there is a chance of a later subclass. | |
2470 C->dependencies()->assert_leaf_type(ik); | |
2471 } | |
2472 return SSC_easy_test; // (3) caller can do a simple ptr comparison | |
2473 } | |
2474 } else { | |
2475 // A primitive array type has no subtypes. | |
2476 return SSC_easy_test; // (3) caller can do a simple ptr comparison | |
2477 } | |
2478 | |
2479 return SSC_full_test; | |
2480 } | |
2481 | |
2482 // Profile-driven exact type check: | |
2483 Node* GraphKit::type_check_receiver(Node* receiver, ciKlass* klass, | |
2484 float prob, | |
2485 Node* *casted_receiver) { | |
2486 const TypeKlassPtr* tklass = TypeKlassPtr::make(klass); | |
2487 Node* recv_klass = load_object_klass(receiver); | |
2488 Node* want_klass = makecon(tklass); | |
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2489 Node* cmp = _gvn.transform( new(C) CmpPNode(recv_klass, want_klass) ); |
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2490 Node* bol = _gvn.transform( new(C) BoolNode(cmp, BoolTest::eq) ); |
0 | 2491 IfNode* iff = create_and_xform_if(control(), bol, prob, COUNT_UNKNOWN); |
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2492 set_control( _gvn.transform( new(C) IfTrueNode (iff) )); |
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2493 Node* fail = _gvn.transform( new(C) IfFalseNode(iff) ); |
0 | 2494 |
2495 const TypeOopPtr* recv_xtype = tklass->as_instance_type(); | |
2496 assert(recv_xtype->klass_is_exact(), ""); | |
2497 | |
2498 // Subsume downstream occurrences of receiver with a cast to | |
2499 // recv_xtype, since now we know what the type will be. | |
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2500 Node* cast = new(C) CheckCastPPNode(control(), receiver, recv_xtype); |
0 | 2501 (*casted_receiver) = _gvn.transform(cast); |
2502 // (User must make the replace_in_map call.) | |
2503 | |
2504 return fail; | |
2505 } | |
2506 | |
2507 | |
1746
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2508 //------------------------------seems_never_null------------------------------- |
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2509 // Use null_seen information if it is available from the profile. |
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2510 // If we see an unexpected null at a type check we record it and force a |
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2511 // recompile; the offending check will be recompiled to handle NULLs. |
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2512 // If we see several offending BCIs, then all checks in the |
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2513 // method will be recompiled. |
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2514 bool GraphKit::seems_never_null(Node* obj, ciProfileData* data) { |
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2515 if (UncommonNullCast // Cutout for this technique |
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2516 && obj != null() // And not the -Xcomp stupid case? |
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2517 && !too_many_traps(Deoptimization::Reason_null_check) |
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2518 ) { |
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2519 if (data == NULL) |
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2520 // Edge case: no mature data. Be optimistic here. |
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2521 return true; |
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2522 // If the profile has not seen a null, assume it won't happen. |
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2523 assert(java_bc() == Bytecodes::_checkcast || |
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2524 java_bc() == Bytecodes::_instanceof || |
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2525 java_bc() == Bytecodes::_aastore, "MDO must collect null_seen bit here"); |
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2526 return !data->as_BitData()->null_seen(); |
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2527 } |
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2528 return false; |
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2529 } |
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2530 |
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2531 //------------------------maybe_cast_profiled_receiver------------------------- |
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2532 // If the profile has seen exactly one type, narrow to exactly that type. |
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2533 // Subsequent type checks will always fold up. |
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2534 Node* GraphKit::maybe_cast_profiled_receiver(Node* not_null_obj, |
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2535 ciProfileData* data, |
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2536 ciKlass* require_klass) { |
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2537 if (!UseTypeProfile || !TypeProfileCasts) return NULL; |
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2538 if (data == NULL) return NULL; |
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2539 |
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2540 // Make sure we haven't already deoptimized from this tactic. |
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2541 if (too_many_traps(Deoptimization::Reason_class_check)) |
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2542 return NULL; |
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2543 |
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2544 // (No, this isn't a call, but it's enough like a virtual call |
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2545 // to use the same ciMethod accessor to get the profile info...) |
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2546 ciCallProfile profile = method()->call_profile_at_bci(bci()); |
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2547 if (profile.count() >= 0 && // no cast failures here |
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2548 profile.has_receiver(0) && |
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2549 profile.morphism() == 1) { |
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2550 ciKlass* exact_kls = profile.receiver(0); |
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2551 if (require_klass == NULL || |
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2552 static_subtype_check(require_klass, exact_kls) == SSC_always_true) { |
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2553 // If we narrow the type to match what the type profile sees, |
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2554 // we can then remove the rest of the cast. |
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2555 // This is a win, even if the exact_kls is very specific, |
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2556 // because downstream operations, such as method calls, |
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2557 // will often benefit from the sharper type. |
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2558 Node* exact_obj = not_null_obj; // will get updated in place... |
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2559 Node* slow_ctl = type_check_receiver(exact_obj, exact_kls, 1.0, |
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2560 &exact_obj); |
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2561 { PreserveJVMState pjvms(this); |
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2562 set_control(slow_ctl); |
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2563 uncommon_trap(Deoptimization::Reason_class_check, |
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2564 Deoptimization::Action_maybe_recompile); |
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2565 } |
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2566 replace_in_map(not_null_obj, exact_obj); |
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2567 return exact_obj; |
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2568 } |
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2569 // assert(ssc == SSC_always_true)... except maybe the profile lied to us. |
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2570 } |
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2571 |
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2572 return NULL; |
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2573 } |
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2574 |
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2575 |
0 | 2576 //-------------------------------gen_instanceof-------------------------------- |
2577 // Generate an instance-of idiom. Used by both the instance-of bytecode | |
2578 // and the reflective instance-of call. | |
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2579 Node* GraphKit::gen_instanceof(Node* obj, Node* superklass) { |
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2580 kill_dead_locals(); // Benefit all the uncommon traps |
0 | 2581 assert( !stopped(), "dead parse path should be checked in callers" ); |
2582 assert(!TypePtr::NULL_PTR->higher_equal(_gvn.type(superklass)->is_klassptr()), | |
2583 "must check for not-null not-dead klass in callers"); | |
2584 | |
2585 // Make the merge point | |
2586 enum { _obj_path = 1, _fail_path, _null_path, PATH_LIMIT }; | |
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2587 RegionNode* region = new(C) RegionNode(PATH_LIMIT); |
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2588 Node* phi = new(C) PhiNode(region, TypeInt::BOOL); |
0 | 2589 C->set_has_split_ifs(true); // Has chance for split-if optimization |
2590 | |
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2591 ciProfileData* data = NULL; |
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2592 if (java_bc() == Bytecodes::_instanceof) { // Only for the bytecode |
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2593 data = method()->method_data()->bci_to_data(bci()); |
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2594 } |
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2595 bool never_see_null = (ProfileDynamicTypes // aggressive use of profile |
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2596 && seems_never_null(obj, data)); |
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2597 |
0 | 2598 // Null check; get casted pointer; set region slot 3 |
2599 Node* null_ctl = top(); | |
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2600 Node* not_null_obj = null_check_oop(obj, &null_ctl, never_see_null); |
0 | 2601 |
2602 // If not_null_obj is dead, only null-path is taken | |
2603 if (stopped()) { // Doing instance-of on a NULL? | |
2604 set_control(null_ctl); | |
2605 return intcon(0); | |
2606 } | |
2607 region->init_req(_null_path, null_ctl); | |
2608 phi ->init_req(_null_path, intcon(0)); // Set null path value | |
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2609 if (null_ctl == top()) { |
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2610 // Do this eagerly, so that pattern matches like is_diamond_phi |
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2611 // will work even during parsing. |
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2612 assert(_null_path == PATH_LIMIT-1, "delete last"); |
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2613 region->del_req(_null_path); |
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2614 phi ->del_req(_null_path); |
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2615 } |
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2616 |
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2617 if (ProfileDynamicTypes && data != NULL) { |
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2618 Node* cast_obj = maybe_cast_profiled_receiver(not_null_obj, data, NULL); |
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2619 if (stopped()) { // Profile disagrees with this path. |
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2620 set_control(null_ctl); // Null is the only remaining possibility. |
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2621 return intcon(0); |
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2622 } |
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2623 if (cast_obj != NULL) |
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2624 not_null_obj = cast_obj; |
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2625 } |
0 | 2626 |
2627 // Load the object's klass | |
2628 Node* obj_klass = load_object_klass(not_null_obj); | |
2629 | |
2630 // Generate the subtype check | |
2631 Node* not_subtype_ctrl = gen_subtype_check(obj_klass, superklass); | |
2632 | |
2633 // Plug in the success path to the general merge in slot 1. | |
2634 region->init_req(_obj_path, control()); | |
2635 phi ->init_req(_obj_path, intcon(1)); | |
2636 | |
2637 // Plug in the failing path to the general merge in slot 2. | |
2638 region->init_req(_fail_path, not_subtype_ctrl); | |
2639 phi ->init_req(_fail_path, intcon(0)); | |
2640 | |
2641 // Return final merged results | |
2642 set_control( _gvn.transform(region) ); | |
2643 record_for_igvn(region); | |
2644 return _gvn.transform(phi); | |
2645 } | |
2646 | |
2647 //-------------------------------gen_checkcast--------------------------------- | |
2648 // Generate a checkcast idiom. Used by both the checkcast bytecode and the | |
2649 // array store bytecode. Stack must be as-if BEFORE doing the bytecode so the | |
2650 // uncommon-trap paths work. Adjust stack after this call. | |
2651 // If failure_control is supplied and not null, it is filled in with | |
2652 // the control edge for the cast failure. Otherwise, an appropriate | |
2653 // uncommon trap or exception is thrown. | |
2654 Node* GraphKit::gen_checkcast(Node *obj, Node* superklass, | |
2655 Node* *failure_control) { | |
2656 kill_dead_locals(); // Benefit all the uncommon traps | |
2657 const TypeKlassPtr *tk = _gvn.type(superklass)->is_klassptr(); | |
2658 const Type *toop = TypeOopPtr::make_from_klass(tk->klass()); | |
2659 | |
2660 // Fast cutout: Check the case that the cast is vacuously true. | |
2661 // This detects the common cases where the test will short-circuit | |
2662 // away completely. We do this before we perform the null check, | |
2663 // because if the test is going to turn into zero code, we don't | |
2664 // want a residual null check left around. (Causes a slowdown, | |
2665 // for example, in some objArray manipulations, such as a[i]=a[j].) | |
2666 if (tk->singleton()) { | |
2667 const TypeOopPtr* objtp = _gvn.type(obj)->isa_oopptr(); | |
2668 if (objtp != NULL && objtp->klass() != NULL) { | |
2669 switch (static_subtype_check(tk->klass(), objtp->klass())) { | |
2670 case SSC_always_true: | |
2671 return obj; | |
2672 case SSC_always_false: | |
2673 // It needs a null check because a null will *pass* the cast check. | |
2674 // A non-null value will always produce an exception. | |
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2675 return null_assert(obj); |
0 | 2676 } |
2677 } | |
2678 } | |
2679 | |
2680 ciProfileData* data = NULL; | |
2681 if (failure_control == NULL) { // use MDO in regular case only | |
2682 assert(java_bc() == Bytecodes::_aastore || | |
2683 java_bc() == Bytecodes::_checkcast, | |
2684 "interpreter profiles type checks only for these BCs"); | |
2685 data = method()->method_data()->bci_to_data(bci()); | |
2686 } | |
2687 | |
2688 // Make the merge point | |
2689 enum { _obj_path = 1, _null_path, PATH_LIMIT }; | |
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2690 RegionNode* region = new (C) RegionNode(PATH_LIMIT); |
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2691 Node* phi = new (C) PhiNode(region, toop); |
0 | 2692 C->set_has_split_ifs(true); // Has chance for split-if optimization |
2693 | |
2694 // Use null-cast information if it is available | |
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2695 bool never_see_null = ((failure_control == NULL) // regular case only |
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2696 && seems_never_null(obj, data)); |
0 | 2697 |
2698 // Null check; get casted pointer; set region slot 3 | |
2699 Node* null_ctl = top(); | |
2700 Node* not_null_obj = null_check_oop(obj, &null_ctl, never_see_null); | |
2701 | |
2702 // If not_null_obj is dead, only null-path is taken | |
2703 if (stopped()) { // Doing instance-of on a NULL? | |
2704 set_control(null_ctl); | |
2705 return null(); | |
2706 } | |
2707 region->init_req(_null_path, null_ctl); | |
2708 phi ->init_req(_null_path, null()); // Set null path value | |
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2709 if (null_ctl == top()) { |
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2710 // Do this eagerly, so that pattern matches like is_diamond_phi |
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2711 // will work even during parsing. |
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2712 assert(_null_path == PATH_LIMIT-1, "delete last"); |
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2713 region->del_req(_null_path); |
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2714 phi ->del_req(_null_path); |
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2715 } |
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2716 |
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2717 Node* cast_obj = NULL; |
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2718 if (data != NULL && |
0 | 2719 // Counter has never been decremented (due to cast failure). |
2720 // ...This is a reasonable thing to expect. It is true of | |
2721 // all casts inserted by javac to implement generic types. | |
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2722 data->as_CounterData()->count() >= 0) { |
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2723 cast_obj = maybe_cast_profiled_receiver(not_null_obj, data, tk->klass()); |
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2724 if (cast_obj != NULL) { |
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2725 if (failure_control != NULL) // failure is now impossible |
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2726 (*failure_control) = top(); |
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2727 // adjust the type of the phi to the exact klass: |
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2728 phi->raise_bottom_type(_gvn.type(cast_obj)->meet(TypePtr::NULL_PTR)); |
0 | 2729 } |
2730 } | |
2731 | |
2732 if (cast_obj == NULL) { | |
2733 // Load the object's klass | |
2734 Node* obj_klass = load_object_klass(not_null_obj); | |
2735 | |
2736 // Generate the subtype check | |
2737 Node* not_subtype_ctrl = gen_subtype_check( obj_klass, superklass ); | |
2738 | |
2739 // Plug in success path into the merge | |
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2740 cast_obj = _gvn.transform(new (C) CheckCastPPNode(control(), |
0 | 2741 not_null_obj, toop)); |
2742 // Failure path ends in uncommon trap (or may be dead - failure impossible) | |
2743 if (failure_control == NULL) { | |
2744 if (not_subtype_ctrl != top()) { // If failure is possible | |
2745 PreserveJVMState pjvms(this); | |
2746 set_control(not_subtype_ctrl); | |
2747 builtin_throw(Deoptimization::Reason_class_check, obj_klass); | |
2748 } | |
2749 } else { | |
2750 (*failure_control) = not_subtype_ctrl; | |
2751 } | |
2752 } | |
2753 | |
2754 region->init_req(_obj_path, control()); | |
2755 phi ->init_req(_obj_path, cast_obj); | |
2756 | |
2757 // A merge of NULL or Casted-NotNull obj | |
2758 Node* res = _gvn.transform(phi); | |
2759 | |
2760 // Note I do NOT always 'replace_in_map(obj,result)' here. | |
2761 // if( tk->klass()->can_be_primary_super() ) | |
2762 // This means that if I successfully store an Object into an array-of-String | |
2763 // I 'forget' that the Object is really now known to be a String. I have to | |
2764 // do this because we don't have true union types for interfaces - if I store | |
2765 // a Baz into an array-of-Interface and then tell the optimizer it's an | |
2766 // Interface, I forget that it's also a Baz and cannot do Baz-like field | |
2767 // references to it. FIX THIS WHEN UNION TYPES APPEAR! | |
2768 // replace_in_map( obj, res ); | |
2769 | |
2770 // Return final merged results | |
2771 set_control( _gvn.transform(region) ); | |
2772 record_for_igvn(region); | |
2773 return res; | |
2774 } | |
2775 | |
2776 //------------------------------next_monitor----------------------------------- | |
2777 // What number should be given to the next monitor? | |
2778 int GraphKit::next_monitor() { | |
2779 int current = jvms()->monitor_depth()* C->sync_stack_slots(); | |
2780 int next = current + C->sync_stack_slots(); | |
2781 // Keep the toplevel high water mark current: | |
2782 if (C->fixed_slots() < next) C->set_fixed_slots(next); | |
2783 return current; | |
2784 } | |
2785 | |
2786 //------------------------------insert_mem_bar--------------------------------- | |
2787 // Memory barrier to avoid floating things around | |
2788 // The membar serves as a pinch point between both control and all memory slices. | |
2789 Node* GraphKit::insert_mem_bar(int opcode, Node* precedent) { | |
2790 MemBarNode* mb = MemBarNode::make(C, opcode, Compile::AliasIdxBot, precedent); | |
2791 mb->init_req(TypeFunc::Control, control()); | |
2792 mb->init_req(TypeFunc::Memory, reset_memory()); | |
2793 Node* membar = _gvn.transform(mb); | |
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2794 set_control(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Control))); |
0 | 2795 set_all_memory_call(membar); |
2796 return membar; | |
2797 } | |
2798 | |
2799 //-------------------------insert_mem_bar_volatile---------------------------- | |
2800 // Memory barrier to avoid floating things around | |
2801 // The membar serves as a pinch point between both control and memory(alias_idx). | |
2802 // If you want to make a pinch point on all memory slices, do not use this | |
2803 // function (even with AliasIdxBot); use insert_mem_bar() instead. | |
2804 Node* GraphKit::insert_mem_bar_volatile(int opcode, int alias_idx, Node* precedent) { | |
2805 // When Parse::do_put_xxx updates a volatile field, it appends a series | |
2806 // of MemBarVolatile nodes, one for *each* volatile field alias category. | |
2807 // The first membar is on the same memory slice as the field store opcode. | |
2808 // This forces the membar to follow the store. (Bug 6500685 broke this.) | |
2809 // All the other membars (for other volatile slices, including AliasIdxBot, | |
2810 // which stands for all unknown volatile slices) are control-dependent | |
2811 // on the first membar. This prevents later volatile loads or stores | |
2812 // from sliding up past the just-emitted store. | |
2813 | |
2814 MemBarNode* mb = MemBarNode::make(C, opcode, alias_idx, precedent); | |
2815 mb->set_req(TypeFunc::Control,control()); | |
2816 if (alias_idx == Compile::AliasIdxBot) { | |
2817 mb->set_req(TypeFunc::Memory, merged_memory()->base_memory()); | |
2818 } else { | |
2819 assert(!(opcode == Op_Initialize && alias_idx != Compile::AliasIdxRaw), "fix caller"); | |
2820 mb->set_req(TypeFunc::Memory, memory(alias_idx)); | |
2821 } | |
2822 Node* membar = _gvn.transform(mb); | |
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2823 set_control(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Control))); |
0 | 2824 if (alias_idx == Compile::AliasIdxBot) { |
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2825 merged_memory()->set_base_memory(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Memory))); |
0 | 2826 } else { |
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2827 set_memory(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Memory)),alias_idx); |
0 | 2828 } |
2829 return membar; | |
2830 } | |
2831 | |
2832 //------------------------------shared_lock------------------------------------ | |
2833 // Emit locking code. | |
2834 FastLockNode* GraphKit::shared_lock(Node* obj) { | |
2835 // bci is either a monitorenter bc or InvocationEntryBci | |
2836 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces | |
2837 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); | |
2838 | |
2839 if( !GenerateSynchronizationCode ) | |
2840 return NULL; // Not locking things? | |
2841 if (stopped()) // Dead monitor? | |
2842 return NULL; | |
2843 | |
2844 assert(dead_locals_are_killed(), "should kill locals before sync. point"); | |
2845 | |
2846 // Box the stack location | |
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2847 Node* box = _gvn.transform(new (C) BoxLockNode(next_monitor())); |
0 | 2848 Node* mem = reset_memory(); |
2849 | |
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2850 FastLockNode * flock = _gvn.transform(new (C) FastLockNode(0, obj, box) )->as_FastLock(); |
0 | 2851 if (PrintPreciseBiasedLockingStatistics) { |
2852 // Create the counters for this fast lock. | |
2853 flock->create_lock_counter(sync_jvms()); // sync_jvms used to get current bci | |
2854 } | |
2855 // Add monitor to debug info for the slow path. If we block inside the | |
2856 // slow path and de-opt, we need the monitor hanging around | |
2857 map()->push_monitor( flock ); | |
2858 | |
2859 const TypeFunc *tf = LockNode::lock_type(); | |
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2860 LockNode *lock = new (C) LockNode(C, tf); |
0 | 2861 |
2862 lock->init_req( TypeFunc::Control, control() ); | |
2863 lock->init_req( TypeFunc::Memory , mem ); | |
2864 lock->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
2865 lock->init_req( TypeFunc::FramePtr, frameptr() ); | |
2866 lock->init_req( TypeFunc::ReturnAdr, top() ); | |
2867 | |
2868 lock->init_req(TypeFunc::Parms + 0, obj); | |
2869 lock->init_req(TypeFunc::Parms + 1, box); | |
2870 lock->init_req(TypeFunc::Parms + 2, flock); | |
2871 add_safepoint_edges(lock); | |
2872 | |
2873 lock = _gvn.transform( lock )->as_Lock(); | |
2874 | |
2875 // lock has no side-effects, sets few values | |
2876 set_predefined_output_for_runtime_call(lock, mem, TypeRawPtr::BOTTOM); | |
2877 | |
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2878 insert_mem_bar(Op_MemBarAcquireLock); |
0 | 2879 |
2880 // Add this to the worklist so that the lock can be eliminated | |
2881 record_for_igvn(lock); | |
2882 | |
2883 #ifndef PRODUCT | |
2884 if (PrintLockStatistics) { | |
2885 // Update the counter for this lock. Don't bother using an atomic | |
2886 // operation since we don't require absolute accuracy. | |
2887 lock->create_lock_counter(map()->jvms()); | |
1609 | 2888 increment_counter(lock->counter()->addr()); |
0 | 2889 } |
2890 #endif | |
2891 | |
2892 return flock; | |
2893 } | |
2894 | |
2895 | |
2896 //------------------------------shared_unlock---------------------------------- | |
2897 // Emit unlocking code. | |
2898 void GraphKit::shared_unlock(Node* box, Node* obj) { | |
2899 // bci is either a monitorenter bc or InvocationEntryBci | |
2900 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces | |
2901 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); | |
2902 | |
2903 if( !GenerateSynchronizationCode ) | |
2904 return; | |
2905 if (stopped()) { // Dead monitor? | |
2906 map()->pop_monitor(); // Kill monitor from debug info | |
2907 return; | |
2908 } | |
2909 | |
2910 // Memory barrier to avoid floating things down past the locked region | |
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2911 insert_mem_bar(Op_MemBarReleaseLock); |
0 | 2912 |
2913 const TypeFunc *tf = OptoRuntime::complete_monitor_exit_Type(); | |
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2914 UnlockNode *unlock = new (C) UnlockNode(C, tf); |
0 | 2915 uint raw_idx = Compile::AliasIdxRaw; |
2916 unlock->init_req( TypeFunc::Control, control() ); | |
2917 unlock->init_req( TypeFunc::Memory , memory(raw_idx) ); | |
2918 unlock->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
2919 unlock->init_req( TypeFunc::FramePtr, frameptr() ); | |
2920 unlock->init_req( TypeFunc::ReturnAdr, top() ); | |
2921 | |
2922 unlock->init_req(TypeFunc::Parms + 0, obj); | |
2923 unlock->init_req(TypeFunc::Parms + 1, box); | |
2924 unlock = _gvn.transform(unlock)->as_Unlock(); | |
2925 | |
2926 Node* mem = reset_memory(); | |
2927 | |
2928 // unlock has no side-effects, sets few values | |
2929 set_predefined_output_for_runtime_call(unlock, mem, TypeRawPtr::BOTTOM); | |
2930 | |
2931 // Kill monitor from debug info | |
2932 map()->pop_monitor( ); | |
2933 } | |
2934 | |
2935 //-------------------------------get_layout_helper----------------------------- | |
2936 // If the given klass is a constant or known to be an array, | |
2937 // fetch the constant layout helper value into constant_value | |
2938 // and return (Node*)NULL. Otherwise, load the non-constant | |
2939 // layout helper value, and return the node which represents it. | |
2940 // This two-faced routine is useful because allocation sites | |
2941 // almost always feature constant types. | |
2942 Node* GraphKit::get_layout_helper(Node* klass_node, jint& constant_value) { | |
2943 const TypeKlassPtr* inst_klass = _gvn.type(klass_node)->isa_klassptr(); | |
2944 if (!StressReflectiveCode && inst_klass != NULL) { | |
2945 ciKlass* klass = inst_klass->klass(); | |
2946 bool xklass = inst_klass->klass_is_exact(); | |
2947 if (xklass || klass->is_array_klass()) { | |
2948 jint lhelper = klass->layout_helper(); | |
2949 if (lhelper != Klass::_lh_neutral_value) { | |
2950 constant_value = lhelper; | |
2951 return (Node*) NULL; | |
2952 } | |
2953 } | |
2954 } | |
2955 constant_value = Klass::_lh_neutral_value; // put in a known value | |
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2956 Node* lhp = basic_plus_adr(klass_node, klass_node, in_bytes(Klass::layout_helper_offset())); |
0 | 2957 return make_load(NULL, lhp, TypeInt::INT, T_INT); |
2958 } | |
2959 | |
2960 // We just put in an allocate/initialize with a big raw-memory effect. | |
2961 // Hook selected additional alias categories on the initialization. | |
2962 static void hook_memory_on_init(GraphKit& kit, int alias_idx, | |
2963 MergeMemNode* init_in_merge, | |
2964 Node* init_out_raw) { | |
2965 DEBUG_ONLY(Node* init_in_raw = init_in_merge->base_memory()); | |
2966 assert(init_in_merge->memory_at(alias_idx) == init_in_raw, ""); | |
2967 | |
2968 Node* prevmem = kit.memory(alias_idx); | |
2969 init_in_merge->set_memory_at(alias_idx, prevmem); | |
2970 kit.set_memory(init_out_raw, alias_idx); | |
2971 } | |
2972 | |
2973 //---------------------------set_output_for_allocation------------------------- | |
2974 Node* GraphKit::set_output_for_allocation(AllocateNode* alloc, | |
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2975 const TypeOopPtr* oop_type) { |
0 | 2976 int rawidx = Compile::AliasIdxRaw; |
2977 alloc->set_req( TypeFunc::FramePtr, frameptr() ); | |
2978 add_safepoint_edges(alloc); | |
2979 Node* allocx = _gvn.transform(alloc); | |
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2980 set_control( _gvn.transform(new (C) ProjNode(allocx, TypeFunc::Control) ) ); |
0 | 2981 // create memory projection for i_o |
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2982 set_memory ( _gvn.transform( new (C) ProjNode(allocx, TypeFunc::Memory, true) ), rawidx ); |
0 | 2983 make_slow_call_ex(allocx, env()->OutOfMemoryError_klass(), true); |
2984 | |
2985 // create a memory projection as for the normal control path | |
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2986 Node* malloc = _gvn.transform(new (C) ProjNode(allocx, TypeFunc::Memory)); |
0 | 2987 set_memory(malloc, rawidx); |
2988 | |
2989 // a normal slow-call doesn't change i_o, but an allocation does | |
2990 // we create a separate i_o projection for the normal control path | |
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2991 set_i_o(_gvn.transform( new (C) ProjNode(allocx, TypeFunc::I_O, false) ) ); |
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2992 Node* rawoop = _gvn.transform( new (C) ProjNode(allocx, TypeFunc::Parms) ); |
0 | 2993 |
2994 // put in an initialization barrier | |
2995 InitializeNode* init = insert_mem_bar_volatile(Op_Initialize, rawidx, | |
2996 rawoop)->as_Initialize(); | |
2997 assert(alloc->initialization() == init, "2-way macro link must work"); | |
2998 assert(init ->allocation() == alloc, "2-way macro link must work"); | |
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2999 { |
0 | 3000 // Extract memory strands which may participate in the new object's |
3001 // initialization, and source them from the new InitializeNode. | |
3002 // This will allow us to observe initializations when they occur, | |
3003 // and link them properly (as a group) to the InitializeNode. | |
3004 assert(init->in(InitializeNode::Memory) == malloc, ""); | |
3005 MergeMemNode* minit_in = MergeMemNode::make(C, malloc); | |
3006 init->set_req(InitializeNode::Memory, minit_in); | |
3007 record_for_igvn(minit_in); // fold it up later, if possible | |
3008 Node* minit_out = memory(rawidx); | |
3009 assert(minit_out->is_Proj() && minit_out->in(0) == init, ""); | |
3010 if (oop_type->isa_aryptr()) { | |
3011 const TypePtr* telemref = oop_type->add_offset(Type::OffsetBot); | |
3012 int elemidx = C->get_alias_index(telemref); | |
3013 hook_memory_on_init(*this, elemidx, minit_in, minit_out); | |
3014 } else if (oop_type->isa_instptr()) { | |
3015 ciInstanceKlass* ik = oop_type->klass()->as_instance_klass(); | |
3016 for (int i = 0, len = ik->nof_nonstatic_fields(); i < len; i++) { | |
3017 ciField* field = ik->nonstatic_field_at(i); | |
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3018 if (field->offset() >= TrackedInitializationLimit * HeapWordSize) |
0 | 3019 continue; // do not bother to track really large numbers of fields |
3020 // Find (or create) the alias category for this field: | |
3021 int fieldidx = C->alias_type(field)->index(); | |
3022 hook_memory_on_init(*this, fieldidx, minit_in, minit_out); | |
3023 } | |
3024 } | |
3025 } | |
3026 | |
3027 // Cast raw oop to the real thing... | |
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3028 Node* javaoop = new (C) CheckCastPPNode(control(), rawoop, oop_type); |
0 | 3029 javaoop = _gvn.transform(javaoop); |
3030 C->set_recent_alloc(control(), javaoop); | |
3031 assert(just_allocated_object(control()) == javaoop, "just allocated"); | |
3032 | |
3033 #ifdef ASSERT | |
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3034 { // Verify that the AllocateNode::Ideal_allocation recognizers work: |
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3035 assert(AllocateNode::Ideal_allocation(rawoop, &_gvn) == alloc, |
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3036 "Ideal_allocation works"); |
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3037 assert(AllocateNode::Ideal_allocation(javaoop, &_gvn) == alloc, |
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3038 "Ideal_allocation works"); |
0 | 3039 if (alloc->is_AllocateArray()) { |
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3040 assert(AllocateArrayNode::Ideal_array_allocation(rawoop, &_gvn) == alloc->as_AllocateArray(), |
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3041 "Ideal_allocation works"); |
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3042 assert(AllocateArrayNode::Ideal_array_allocation(javaoop, &_gvn) == alloc->as_AllocateArray(), |
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3043 "Ideal_allocation works"); |
0 | 3044 } else { |
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3045 assert(alloc->in(AllocateNode::ALength)->is_top(), "no length, please"); |
0 | 3046 } |
3047 } | |
3048 #endif //ASSERT | |
3049 | |
3050 return javaoop; | |
3051 } | |
3052 | |
3053 //---------------------------new_instance-------------------------------------- | |
3054 // This routine takes a klass_node which may be constant (for a static type) | |
3055 // or may be non-constant (for reflective code). It will work equally well | |
3056 // for either, and the graph will fold nicely if the optimizer later reduces | |
3057 // the type to a constant. | |
3058 // The optional arguments are for specialized use by intrinsics: | |
3059 // - If 'extra_slow_test' if not null is an extra condition for the slow-path. | |
3060 // - If 'return_size_val', report the the total object size to the caller. | |
3061 Node* GraphKit::new_instance(Node* klass_node, | |
3062 Node* extra_slow_test, | |
3063 Node* *return_size_val) { | |
3064 // Compute size in doublewords | |
3065 // The size is always an integral number of doublewords, represented | |
3066 // as a positive bytewise size stored in the klass's layout_helper. | |
3067 // The layout_helper also encodes (in a low bit) the need for a slow path. | |
3068 jint layout_con = Klass::_lh_neutral_value; | |
3069 Node* layout_val = get_layout_helper(klass_node, layout_con); | |
3070 int layout_is_con = (layout_val == NULL); | |
3071 | |
3072 if (extra_slow_test == NULL) extra_slow_test = intcon(0); | |
3073 // Generate the initial go-slow test. It's either ALWAYS (return a | |
3074 // Node for 1) or NEVER (return a NULL) or perhaps (in the reflective | |
3075 // case) a computed value derived from the layout_helper. | |
3076 Node* initial_slow_test = NULL; | |
3077 if (layout_is_con) { | |
3078 assert(!StressReflectiveCode, "stress mode does not use these paths"); | |
3079 bool must_go_slow = Klass::layout_helper_needs_slow_path(layout_con); | |
3080 initial_slow_test = must_go_slow? intcon(1): extra_slow_test; | |
3081 | |
3082 } else { // reflective case | |
3083 // This reflective path is used by Unsafe.allocateInstance. | |
3084 // (It may be stress-tested by specifying StressReflectiveCode.) | |
3085 // Basically, we want to get into the VM is there's an illegal argument. | |
3086 Node* bit = intcon(Klass::_lh_instance_slow_path_bit); | |
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3087 initial_slow_test = _gvn.transform( new (C) AndINode(layout_val, bit) ); |
0 | 3088 if (extra_slow_test != intcon(0)) { |
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3089 initial_slow_test = _gvn.transform( new (C) OrINode(initial_slow_test, extra_slow_test) ); |
0 | 3090 } |
3091 // (Macro-expander will further convert this to a Bool, if necessary.) | |
3092 } | |
3093 | |
3094 // Find the size in bytes. This is easy; it's the layout_helper. | |
3095 // The size value must be valid even if the slow path is taken. | |
3096 Node* size = NULL; | |
3097 if (layout_is_con) { | |
3098 size = MakeConX(Klass::layout_helper_size_in_bytes(layout_con)); | |
3099 } else { // reflective case | |
3100 // This reflective path is used by clone and Unsafe.allocateInstance. | |
3101 size = ConvI2X(layout_val); | |
3102 | |
3103 // Clear the low bits to extract layout_helper_size_in_bytes: | |
3104 assert((int)Klass::_lh_instance_slow_path_bit < BytesPerLong, "clear bit"); | |
3105 Node* mask = MakeConX(~ (intptr_t)right_n_bits(LogBytesPerLong)); | |
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3106 size = _gvn.transform( new (C) AndXNode(size, mask) ); |
0 | 3107 } |
3108 if (return_size_val != NULL) { | |
3109 (*return_size_val) = size; | |
3110 } | |
3111 | |
3112 // This is a precise notnull oop of the klass. | |
3113 // (Actually, it need not be precise if this is a reflective allocation.) | |
3114 // It's what we cast the result to. | |
3115 const TypeKlassPtr* tklass = _gvn.type(klass_node)->isa_klassptr(); | |
3116 if (!tklass) tklass = TypeKlassPtr::OBJECT; | |
3117 const TypeOopPtr* oop_type = tklass->as_instance_type(); | |
3118 | |
3119 // Now generate allocation code | |
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3120 |
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3121 // The entire memory state is needed for slow path of the allocation |
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3122 // since GC and deoptimization can happened. |
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3123 Node *mem = reset_memory(); |
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3124 set_all_memory(mem); // Create new memory state |
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3125 |
0 | 3126 AllocateNode* alloc |
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3127 = new (C) AllocateNode(C, AllocateNode::alloc_type(), |
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3128 control(), mem, i_o(), |
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3129 size, klass_node, |
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3130 initial_slow_test); |
0 | 3131 |
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changeset
|
3132 return set_output_for_allocation(alloc, oop_type); |
0 | 3133 } |
3134 | |
3135 //-------------------------------new_array------------------------------------- | |
3136 // helper for both newarray and anewarray | |
3137 // The 'length' parameter is (obviously) the length of the array. | |
3138 // See comments on new_instance for the meaning of the other arguments. | |
3139 Node* GraphKit::new_array(Node* klass_node, // array klass (maybe variable) | |
3140 Node* length, // number of array elements | |
730
9c6be3edf0dc
6589834: deoptimization problem with -XX:+DeoptimizeALot
cfang
parents:
726
diff
changeset
|
3141 int nargs, // number of arguments to push back for uncommon trap |
0 | 3142 Node* *return_size_val) { |
3143 jint layout_con = Klass::_lh_neutral_value; | |
3144 Node* layout_val = get_layout_helper(klass_node, layout_con); | |
3145 int layout_is_con = (layout_val == NULL); | |
3146 | |
3147 if (!layout_is_con && !StressReflectiveCode && | |
3148 !too_many_traps(Deoptimization::Reason_class_check)) { | |
3149 // This is a reflective array creation site. | |
3150 // Optimistically assume that it is a subtype of Object[], | |
3151 // so that we can fold up all the address arithmetic. | |
3152 layout_con = Klass::array_layout_helper(T_OBJECT); | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
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6725
diff
changeset
|
3153 Node* cmp_lh = _gvn.transform( new(C) CmpINode(layout_val, intcon(layout_con)) ); |
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
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6725
diff
changeset
|
3154 Node* bol_lh = _gvn.transform( new(C) BoolNode(cmp_lh, BoolTest::eq) ); |
0 | 3155 { BuildCutout unless(this, bol_lh, PROB_MAX); |
7194
beebba0acc11
7172640: C2: instrinsic implementations in LibraryCallKit should use argument() instead of pop()
twisti
parents:
6846
diff
changeset
|
3156 inc_sp(nargs); |
0 | 3157 uncommon_trap(Deoptimization::Reason_class_check, |
3158 Deoptimization::Action_maybe_recompile); | |
3159 } | |
3160 layout_val = NULL; | |
3161 layout_is_con = true; | |
3162 } | |
3163 | |
3164 // Generate the initial go-slow test. Make sure we do not overflow | |
3165 // if length is huge (near 2Gig) or negative! We do not need | |
3166 // exact double-words here, just a close approximation of needed | |
3167 // double-words. We can't add any offset or rounding bits, lest we | |
3168 // take a size -1 of bytes and make it positive. Use an unsigned | |
3169 // compare, so negative sizes look hugely positive. | |
3170 int fast_size_limit = FastAllocateSizeLimit; | |
3171 if (layout_is_con) { | |
3172 assert(!StressReflectiveCode, "stress mode does not use these paths"); | |
3173 // Increase the size limit if we have exact knowledge of array type. | |
3174 int log2_esize = Klass::layout_helper_log2_element_size(layout_con); | |
3175 fast_size_limit <<= (LogBytesPerLong - log2_esize); | |
3176 } | |
3177 | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
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6725
diff
changeset
|
3178 Node* initial_slow_cmp = _gvn.transform( new (C) CmpUNode( length, intcon( fast_size_limit ) ) ); |
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
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6725
diff
changeset
|
3179 Node* initial_slow_test = _gvn.transform( new (C) BoolNode( initial_slow_cmp, BoolTest::gt ) ); |
0 | 3180 if (initial_slow_test->is_Bool()) { |
3181 // Hide it behind a CMoveI, or else PhaseIdealLoop::split_up will get sick. | |
3182 initial_slow_test = initial_slow_test->as_Bool()->as_int_value(&_gvn); | |
3183 } | |
3184 | |
3185 // --- Size Computation --- | |
3186 // array_size = round_to_heap(array_header + (length << elem_shift)); | |
3187 // where round_to_heap(x) == round_to(x, MinObjAlignmentInBytes) | |
3188 // and round_to(x, y) == ((x + y-1) & ~(y-1)) | |
3189 // The rounding mask is strength-reduced, if possible. | |
3190 int round_mask = MinObjAlignmentInBytes - 1; | |
3191 Node* header_size = NULL; | |
3192 int header_size_min = arrayOopDesc::base_offset_in_bytes(T_BYTE); | |
3193 // (T_BYTE has the weakest alignment and size restrictions...) | |
3194 if (layout_is_con) { | |
3195 int hsize = Klass::layout_helper_header_size(layout_con); | |
3196 int eshift = Klass::layout_helper_log2_element_size(layout_con); | |
3197 BasicType etype = Klass::layout_helper_element_type(layout_con); | |
3198 if ((round_mask & ~right_n_bits(eshift)) == 0) | |
3199 round_mask = 0; // strength-reduce it if it goes away completely | |
3200 assert((hsize & right_n_bits(eshift)) == 0, "hsize is pre-rounded"); | |
3201 assert(header_size_min <= hsize, "generic minimum is smallest"); | |
3202 header_size_min = hsize; | |
3203 header_size = intcon(hsize + round_mask); | |
3204 } else { | |
3205 Node* hss = intcon(Klass::_lh_header_size_shift); | |
3206 Node* hsm = intcon(Klass::_lh_header_size_mask); | |
6804
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7193318: C2: remove number of inputs requirement from Node's new operator
kvn
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6725
diff
changeset
|
3207 Node* hsize = _gvn.transform( new(C) URShiftINode(layout_val, hss) ); |
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
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6725
diff
changeset
|
3208 hsize = _gvn.transform( new(C) AndINode(hsize, hsm) ); |
0 | 3209 Node* mask = intcon(round_mask); |
6804
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7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3210 header_size = _gvn.transform( new(C) AddINode(hsize, mask) ); |
0 | 3211 } |
3212 | |
3213 Node* elem_shift = NULL; | |
3214 if (layout_is_con) { | |
3215 int eshift = Klass::layout_helper_log2_element_size(layout_con); | |
3216 if (eshift != 0) | |
3217 elem_shift = intcon(eshift); | |
3218 } else { | |
3219 // There is no need to mask or shift this value. | |
3220 // The semantics of LShiftINode include an implicit mask to 0x1F. | |
3221 assert(Klass::_lh_log2_element_size_shift == 0, "use shift in place"); | |
3222 elem_shift = layout_val; | |
3223 } | |
3224 | |
3225 // Transition to native address size for all offset calculations: | |
3226 Node* lengthx = ConvI2X(length); | |
3227 Node* headerx = ConvI2X(header_size); | |
3228 #ifdef _LP64 | |
3229 { const TypeLong* tllen = _gvn.find_long_type(lengthx); | |
3230 if (tllen != NULL && tllen->_lo < 0) { | |
3231 // Add a manual constraint to a positive range. Cf. array_element_address. | |
3232 jlong size_max = arrayOopDesc::max_array_length(T_BYTE); | |
3233 if (size_max > tllen->_hi) size_max = tllen->_hi; | |
3234 const TypeLong* tlcon = TypeLong::make(CONST64(0), size_max, Type::WidenMin); | |
6804
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7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3235 lengthx = _gvn.transform( new (C) ConvI2LNode(length, tlcon)); |
0 | 3236 } |
3237 } | |
3238 #endif | |
3239 | |
3240 // Combine header size (plus rounding) and body size. Then round down. | |
3241 // This computation cannot overflow, because it is used only in two | |
3242 // places, one where the length is sharply limited, and the other | |
3243 // after a successful allocation. | |
3244 Node* abody = lengthx; | |
3245 if (elem_shift != NULL) | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3246 abody = _gvn.transform( new(C) LShiftXNode(lengthx, elem_shift) ); |
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3247 Node* size = _gvn.transform( new(C) AddXNode(headerx, abody) ); |
0 | 3248 if (round_mask != 0) { |
3249 Node* mask = MakeConX(~round_mask); | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3250 size = _gvn.transform( new(C) AndXNode(size, mask) ); |
0 | 3251 } |
3252 // else if round_mask == 0, the size computation is self-rounding | |
3253 | |
3254 if (return_size_val != NULL) { | |
3255 // This is the size | |
3256 (*return_size_val) = size; | |
3257 } | |
3258 | |
3259 // Now generate allocation code | |
74
2a9af0b9cb1c
6674600: (Escape Analysis) Optimize memory graph for instance's fields
kvn
parents:
63
diff
changeset
|
3260 |
565
7fe62bb75bf4
6799693: Server compiler leads to data corruption when expression throws an Exception
kvn
parents:
563
diff
changeset
|
3261 // The entire memory state is needed for slow path of the allocation |
7fe62bb75bf4
6799693: Server compiler leads to data corruption when expression throws an Exception
kvn
parents:
563
diff
changeset
|
3262 // since GC and deoptimization can happened. |
7fe62bb75bf4
6799693: Server compiler leads to data corruption when expression throws an Exception
kvn
parents:
563
diff
changeset
|
3263 Node *mem = reset_memory(); |
7fe62bb75bf4
6799693: Server compiler leads to data corruption when expression throws an Exception
kvn
parents:
563
diff
changeset
|
3264 set_all_memory(mem); // Create new memory state |
74
2a9af0b9cb1c
6674600: (Escape Analysis) Optimize memory graph for instance's fields
kvn
parents:
63
diff
changeset
|
3265 |
0 | 3266 // Create the AllocateArrayNode and its result projections |
3267 AllocateArrayNode* alloc | |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3268 = new (C) AllocateArrayNode(C, AllocateArrayNode::alloc_type(), |
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3269 control(), mem, i_o(), |
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3270 size, klass_node, |
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3271 initial_slow_test, |
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3272 length); |
0 | 3273 |
3274 // Cast to correct type. Note that the klass_node may be constant or not, | |
3275 // and in the latter case the actual array type will be inexact also. | |
3276 // (This happens via a non-constant argument to inline_native_newArray.) | |
3277 // In any case, the value of klass_node provides the desired array type. | |
3278 const TypeInt* length_type = _gvn.find_int_type(length); | |
3279 const TypeOopPtr* ary_type = _gvn.type(klass_node)->is_klassptr()->as_instance_type(); | |
3280 if (ary_type->isa_aryptr() && length_type != NULL) { | |
3281 // Try to get a better type than POS for the size | |
3282 ary_type = ary_type->is_aryptr()->cast_to_size(length_type); | |
3283 } | |
3284 | |
3278
66b0e2371912
7026700: regression in 6u24-rev-b23: Crash in C2 compiler in PhaseIdealLoop::build_loop_late_post
kvn
parents:
2468
diff
changeset
|
3285 Node* javaoop = set_output_for_allocation(alloc, ary_type); |
0 | 3286 |
366
8261ee795323
6711100: 64bit fastdebug server vm crashes with assert(_base == Int,"Not an Int")
rasbold
parents:
332
diff
changeset
|
3287 // Cast length on remaining path to be as narrow as possible |
8261ee795323
6711100: 64bit fastdebug server vm crashes with assert(_base == Int,"Not an Int")
rasbold
parents:
332
diff
changeset
|
3288 if (map()->find_edge(length) >= 0) { |
8261ee795323
6711100: 64bit fastdebug server vm crashes with assert(_base == Int,"Not an Int")
rasbold
parents:
332
diff
changeset
|
3289 Node* ccast = alloc->make_ideal_length(ary_type, &_gvn); |
8261ee795323
6711100: 64bit fastdebug server vm crashes with assert(_base == Int,"Not an Int")
rasbold
parents:
332
diff
changeset
|
3290 if (ccast != length) { |
8261ee795323
6711100: 64bit fastdebug server vm crashes with assert(_base == Int,"Not an Int")
rasbold
parents:
332
diff
changeset
|
3291 _gvn.set_type_bottom(ccast); |
8261ee795323
6711100: 64bit fastdebug server vm crashes with assert(_base == Int,"Not an Int")
rasbold
parents:
332
diff
changeset
|
3292 record_for_igvn(ccast); |
0 | 3293 replace_in_map(length, ccast); |
3294 } | |
3295 } | |
3296 | |
3297 return javaoop; | |
3298 } | |
3299 | |
3300 // The following "Ideal_foo" functions are placed here because they recognize | |
3301 // the graph shapes created by the functions immediately above. | |
3302 | |
3303 //---------------------------Ideal_allocation---------------------------------- | |
3304 // Given an oop pointer or raw pointer, see if it feeds from an AllocateNode. | |
3305 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase) { | |
3306 if (ptr == NULL) { // reduce dumb test in callers | |
3307 return NULL; | |
3308 } | |
3309 if (ptr->is_CheckCastPP()) { // strip a raw-to-oop cast | |
3310 ptr = ptr->in(1); | |
3311 if (ptr == NULL) return NULL; | |
3312 } | |
3313 if (ptr->is_Proj()) { | |
3314 Node* allo = ptr->in(0); | |
3315 if (allo != NULL && allo->is_Allocate()) { | |
3316 return allo->as_Allocate(); | |
3317 } | |
3318 } | |
3319 // Report failure to match. | |
3320 return NULL; | |
3321 } | |
3322 | |
3323 // Fancy version which also strips off an offset (and reports it to caller). | |
3324 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase, | |
3325 intptr_t& offset) { | |
3326 Node* base = AddPNode::Ideal_base_and_offset(ptr, phase, offset); | |
3327 if (base == NULL) return NULL; | |
3328 return Ideal_allocation(base, phase); | |
3329 } | |
3330 | |
3331 // Trace Initialize <- Proj[Parm] <- Allocate | |
3332 AllocateNode* InitializeNode::allocation() { | |
3333 Node* rawoop = in(InitializeNode::RawAddress); | |
3334 if (rawoop->is_Proj()) { | |
3335 Node* alloc = rawoop->in(0); | |
3336 if (alloc->is_Allocate()) { | |
3337 return alloc->as_Allocate(); | |
3338 } | |
3339 } | |
3340 return NULL; | |
3341 } | |
3342 | |
3343 // Trace Allocate -> Proj[Parm] -> Initialize | |
3344 InitializeNode* AllocateNode::initialization() { | |
3345 ProjNode* rawoop = proj_out(AllocateNode::RawAddress); | |
3346 if (rawoop == NULL) return NULL; | |
3347 for (DUIterator_Fast imax, i = rawoop->fast_outs(imax); i < imax; i++) { | |
3348 Node* init = rawoop->fast_out(i); | |
3349 if (init->is_Initialize()) { | |
3350 assert(init->as_Initialize()->allocation() == this, "2-way link"); | |
3351 return init->as_Initialize(); | |
3352 } | |
3353 } | |
3354 return NULL; | |
3355 } | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3356 |
4763
1dc233a8c7fe
7121140: Allocation paths require explicit memory synchronization operations for RMO systems
roland
parents:
4762
diff
changeset
|
3357 // Trace Allocate -> Proj[Parm] -> MemBarStoreStore |
1dc233a8c7fe
7121140: Allocation paths require explicit memory synchronization operations for RMO systems
roland
parents:
4762
diff
changeset
|
3358 MemBarStoreStoreNode* AllocateNode::storestore() { |
1dc233a8c7fe
7121140: Allocation paths require explicit memory synchronization operations for RMO systems
roland
parents:
4762
diff
changeset
|
3359 ProjNode* rawoop = proj_out(AllocateNode::RawAddress); |
1dc233a8c7fe
7121140: Allocation paths require explicit memory synchronization operations for RMO systems
roland
parents:
4762
diff
changeset
|
3360 if (rawoop == NULL) return NULL; |
1dc233a8c7fe
7121140: Allocation paths require explicit memory synchronization operations for RMO systems
roland
parents:
4762
diff
changeset
|
3361 for (DUIterator_Fast imax, i = rawoop->fast_outs(imax); i < imax; i++) { |
1dc233a8c7fe
7121140: Allocation paths require explicit memory synchronization operations for RMO systems
roland
parents:
4762
diff
changeset
|
3362 Node* storestore = rawoop->fast_out(i); |
1dc233a8c7fe
7121140: Allocation paths require explicit memory synchronization operations for RMO systems
roland
parents:
4762
diff
changeset
|
3363 if (storestore->is_MemBarStoreStore()) { |
1dc233a8c7fe
7121140: Allocation paths require explicit memory synchronization operations for RMO systems
roland
parents:
4762
diff
changeset
|
3364 return storestore->as_MemBarStoreStore(); |
1dc233a8c7fe
7121140: Allocation paths require explicit memory synchronization operations for RMO systems
roland
parents:
4762
diff
changeset
|
3365 } |
1dc233a8c7fe
7121140: Allocation paths require explicit memory synchronization operations for RMO systems
roland
parents:
4762
diff
changeset
|
3366 } |
1dc233a8c7fe
7121140: Allocation paths require explicit memory synchronization operations for RMO systems
roland
parents:
4762
diff
changeset
|
3367 return NULL; |
1dc233a8c7fe
7121140: Allocation paths require explicit memory synchronization operations for RMO systems
roland
parents:
4762
diff
changeset
|
3368 } |
1dc233a8c7fe
7121140: Allocation paths require explicit memory synchronization operations for RMO systems
roland
parents:
4762
diff
changeset
|
3369 |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3370 //----------------------------- loop predicates --------------------------- |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3371 |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3372 //------------------------------add_predicate_impl---------------------------- |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3373 void GraphKit::add_predicate_impl(Deoptimization::DeoptReason reason, int nargs) { |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3374 // Too many traps seen? |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3375 if (too_many_traps(reason)) { |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3376 #ifdef ASSERT |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3377 if (TraceLoopPredicate) { |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3378 int tc = C->trap_count(reason); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3379 tty->print("too many traps=%s tcount=%d in ", |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3380 Deoptimization::trap_reason_name(reason), tc); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3381 method()->print(); // which method has too many predicate traps |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3382 tty->cr(); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3383 } |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3384 #endif |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3385 // We cannot afford to take more traps here, |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3386 // do not generate predicate. |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3387 return; |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3388 } |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3389 |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3390 Node *cont = _gvn.intcon(1); |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3391 Node* opq = _gvn.transform(new (C) Opaque1Node(C, cont)); |
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3392 Node *bol = _gvn.transform(new (C) Conv2BNode(opq)); |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3393 IfNode* iff = create_and_map_if(control(), bol, PROB_MAX, COUNT_UNKNOWN); |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3394 Node* iffalse = _gvn.transform(new (C) IfFalseNode(iff)); |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3395 C->add_predicate_opaq(opq); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3396 { |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3397 PreserveJVMState pjvms(this); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3398 set_control(iffalse); |
7194
beebba0acc11
7172640: C2: instrinsic implementations in LibraryCallKit should use argument() instead of pop()
twisti
parents:
6846
diff
changeset
|
3399 inc_sp(nargs); |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3400 uncommon_trap(reason, Deoptimization::Action_maybe_recompile); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3401 } |
6804
e626685e9f6c
7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents:
6725
diff
changeset
|
3402 Node* iftrue = _gvn.transform(new (C) IfTrueNode(iff)); |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3403 set_control(iftrue); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3404 } |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3405 |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3406 //------------------------------add_predicate--------------------------------- |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3407 void GraphKit::add_predicate(int nargs) { |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3408 if (UseLoopPredicate) { |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3409 add_predicate_impl(Deoptimization::Reason_predicate, nargs); |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3410 } |
3345 | 3411 // loop's limit check predicate should be near the loop. |
3412 if (LoopLimitCheck) { | |
3413 add_predicate_impl(Deoptimization::Reason_loop_limit_check, nargs); | |
3414 } | |
2383
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3415 } |
9dc311b8473e
7008866: Missing loop predicate for loop with multiple entries
kvn
parents:
2007
diff
changeset
|
3416 |
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3417 //----------------------------- store barriers ---------------------------- |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3418 #define __ ideal. |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3419 |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3420 void GraphKit::sync_kit(IdealKit& ideal) { |
2444
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3421 set_all_memory(__ merged_memory()); |
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3422 set_i_o(__ i_o()); |
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3423 set_control(__ ctrl()); |
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3424 } |
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3425 |
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3426 void GraphKit::final_sync(IdealKit& ideal) { |
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3427 // Final sync IdealKit and graphKit. |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3428 __ drain_delay_transform(); |
2444
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3429 sync_kit(ideal); |
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3430 } |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3431 |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3432 // vanilla/CMS post barrier |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3433 // Insert a write-barrier store. This is to let generational GC work; we have |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3434 // to flag all oop-stores before the next GC point. |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3435 void GraphKit::write_barrier_post(Node* oop_store, |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3436 Node* obj, |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3437 Node* adr, |
985
685e959d09ea
6877254: Server vm crashes with no branches off of store slice" when run with CMS and UseSuperWord(default)
cfang
parents:
955
diff
changeset
|
3438 uint adr_idx, |
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3439 Node* val, |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3440 bool use_precise) { |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3441 // No store check needed if we're storing a NULL or an old object |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3442 // (latter case is probably a string constant). The concurrent |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3443 // mark sweep garbage collector, however, needs to have all nonNull |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3444 // oop updates flagged via card-marks. |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3445 if (val != NULL && val->is_Con()) { |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3446 // must be either an oop or NULL |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3447 const Type* t = val->bottom_type(); |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3448 if (t == TypePtr::NULL_PTR || t == Type::TOP) |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3449 // stores of null never (?) need barriers |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3450 return; |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3451 } |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3452 |
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3453 if (use_ReduceInitialCardMarks() |
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3454 && obj == just_allocated_object(control())) { |
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3455 // We can skip marks on a freshly-allocated object in Eden. |
1166 | 3456 // Keep this code in sync with new_store_pre_barrier() in runtime.cpp. |
3457 // That routine informs GC to take appropriate compensating steps, | |
3458 // upon a slow-path allocation, so as to make this card-mark | |
3459 // elision safe. | |
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3460 return; |
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3461 } |
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
985
diff
changeset
|
3462 |
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3463 if (!use_precise) { |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3464 // All card marks for a (non-array) instance are in one place: |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3465 adr = obj; |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3466 } |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3467 // (Else it's an array (or unknown), and we want more precise card marks.) |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3468 assert(adr != NULL, ""); |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3469 |
2444
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3470 IdealKit ideal(this, true); |
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3471 |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3472 // Convert the pointer to an int prior to doing math on it |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3473 Node* cast = __ CastPX(__ ctrl(), adr); |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3474 |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3475 // Divide by card size |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3476 assert(Universe::heap()->barrier_set()->kind() == BarrierSet::CardTableModRef, |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3477 "Only one we handle so far."); |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3478 Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) ); |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3479 |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3480 // Combine card table base and card offset |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3481 Node* card_adr = __ AddP(__ top(), byte_map_base_node(), card_offset ); |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3482 |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3483 // Get the alias_index for raw card-mark memory |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3484 int adr_type = Compile::AliasIdxRaw; |
3282 | 3485 Node* zero = __ ConI(0); // Dirty card value |
3486 BasicType bt = T_BYTE; | |
3487 | |
3488 if (UseCondCardMark) { | |
3489 // The classic GC reference write barrier is typically implemented | |
3490 // as a store into the global card mark table. Unfortunately | |
3491 // unconditional stores can result in false sharing and excessive | |
3492 // coherence traffic as well as false transactional aborts. | |
3493 // UseCondCardMark enables MP "polite" conditional card mark | |
3494 // stores. In theory we could relax the load from ctrl() to | |
3495 // no_ctrl, but that doesn't buy much latitude. | |
3496 Node* card_val = __ load( __ ctrl(), card_adr, TypeInt::BYTE, bt, adr_type); | |
3497 __ if_then(card_val, BoolTest::ne, zero); | |
3498 } | |
3499 | |
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3500 // Smash zero into card |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3501 if( !UseConcMarkSweepGC ) { |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3502 __ store(__ ctrl(), card_adr, zero, bt, adr_type); |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3503 } else { |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3504 // Specialized path for CM store barrier |
985
685e959d09ea
6877254: Server vm crashes with no branches off of store slice" when run with CMS and UseSuperWord(default)
cfang
parents:
955
diff
changeset
|
3505 __ storeCM(__ ctrl(), card_adr, zero, oop_store, adr_idx, bt, adr_type); |
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3506 } |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3507 |
3282 | 3508 if (UseCondCardMark) { |
3509 __ end_if(); | |
3510 } | |
3511 | |
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3512 // Final sync IdealKit and GraphKit. |
2444
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3513 final_sync(ideal); |
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3514 } |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3515 |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
kvn
parents:
827
diff
changeset
|
3516 // G1 pre/post barriers |
3249
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3517 void GraphKit::g1_write_barrier_pre(bool do_load, |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3518 Node* obj, |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3519 Node* adr, |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3520 uint alias_idx, |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3521 Node* val, |
825 | 3522 const TypeOopPtr* val_type, |
3249
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3523 Node* pre_val, |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
113
diff
changeset
|
3524 BasicType bt) { |
3249
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3525 |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3526 // Some sanity checks |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3527 // Note: val is unused in this routine. |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3528 |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3529 if (do_load) { |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3530 // We need to generate the load of the previous value |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3531 assert(obj != NULL, "must have a base"); |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3532 assert(adr != NULL, "where are loading from?"); |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3533 assert(pre_val == NULL, "loaded already?"); |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3534 assert(val_type != NULL, "need a type"); |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3535 } else { |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3536 // In this case both val_type and alias_idx are unused. |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3537 assert(pre_val != NULL, "must be loaded already"); |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3538 assert(pre_val->bottom_type()->basic_type() == T_OBJECT, "or we shouldn't be here"); |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3539 } |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3540 assert(bt == T_OBJECT, "or we shouldn't be here"); |
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2383
diff
changeset
|
3541 |
2444
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
kvn
parents:
2383
diff
changeset
|
3542 IdealKit ideal(this, true); |
851
fc4be448891f
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3543 |
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3544 Node* tls = __ thread(); // ThreadLocalStorage |
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3545 |
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3546 Node* no_ctrl = NULL; |
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3547 Node* no_base = __ top(); |
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3548 Node* zero = __ ConI(0); |
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3549 |
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3550 float likely = PROB_LIKELY(0.999); |
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3551 float unlikely = PROB_UNLIKELY(0.999); |
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3552 |
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3553 BasicType active_type = in_bytes(PtrQueue::byte_width_of_active()) == 4 ? T_INT : T_BYTE; |
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3554 assert(in_bytes(PtrQueue::byte_width_of_active()) == 4 || in_bytes(PtrQueue::byte_width_of_active()) == 1, "flag width"); |
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3555 |
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3556 // Offsets into the thread |
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3557 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 648 |
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3558 PtrQueue::byte_offset_of_active()); |
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3559 const int index_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 656 |
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3560 PtrQueue::byte_offset_of_index()); |
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3561 const int buffer_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 652 |
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3562 PtrQueue::byte_offset_of_buf()); |
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3563 |
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3564 // Now the actual pointers into the thread |
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3565 Node* marking_adr = __ AddP(no_base, tls, __ ConX(marking_offset)); |
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3566 Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset)); |
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3567 Node* index_adr = __ AddP(no_base, tls, __ ConX(index_offset)); |
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3568 |
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3569 // Now some of the values |
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3570 Node* marking = __ load(__ ctrl(), marking_adr, TypeInt::INT, active_type, Compile::AliasIdxRaw); |
342
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3571 |
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3572 // if (!marking) |
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3573 __ if_then(marking, BoolTest::ne, zero); { |
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3574 Node* index = __ load(__ ctrl(), index_adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw); |
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3575 |
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3576 if (do_load) { |
342
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3577 // load original value |
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3578 // alias_idx correct?? |
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|
3579 pre_val = __ load(no_ctrl, adr, val_type, bt, alias_idx); |
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|
3580 } |
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|
3581 |
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|
3582 // if (pre_val != NULL) |
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3583 __ if_then(pre_val, BoolTest::ne, null()); { |
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3584 Node* buffer = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw); |
342
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3585 |
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3586 // is the queue for this thread full? |
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3587 __ if_then(index, BoolTest::ne, zero, likely); { |
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3588 |
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3589 // decrement the index |
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3590 Node* next_index = __ SubI(index, __ ConI(sizeof(intptr_t))); |
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3591 Node* next_indexX = next_index; |
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3592 #ifdef _LP64 |
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3593 // We could refine the type for what it's worth |
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3594 // const TypeLong* lidxtype = TypeLong::make(CONST64(0), get_size_from_queue); |
6804
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|
3595 next_indexX = _gvn.transform( new (C) ConvI2LNode(next_index, TypeLong::make(0, max_jlong, Type::WidenMax)) ); |
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3596 #endif |
342
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3597 |
3249
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3598 // Now get the buffer location we will log the previous value into and store it |
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3599 Node *log_addr = __ AddP(no_base, buffer, next_indexX); |
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3600 __ store(__ ctrl(), log_addr, pre_val, T_OBJECT, Compile::AliasIdxRaw); |
342
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3601 // update the index |
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3602 __ store(__ ctrl(), index_adr, next_index, T_INT, Compile::AliasIdxRaw); |
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3603 |
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3604 } __ else_(); { |
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|
3605 |
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3606 // logging buffer is full, call the runtime |
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3607 const TypeFunc *tf = OptoRuntime::g1_wb_pre_Type(); |
3249
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|
3608 __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), "g1_wb_pre", pre_val, tls); |
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3609 } __ end_if(); // (!index) |
3249
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|
3610 } __ end_if(); // (pre_val != NULL) |
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3611 } __ end_if(); // (!marking) |
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3612 |
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|
3613 // Final sync IdealKit and GraphKit. |
2444
07acc51c1d2a
7032314: Allow to generate CallLeafNoFPNode in IdealKit
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|
3614 final_sync(ideal); |
342
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3615 } |
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3616 |
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3617 // |
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3618 // Update the card table and add card address to the queue |
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3619 // |
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3620 void GraphKit::g1_mark_card(IdealKit& ideal, |
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3621 Node* card_adr, |
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3622 Node* oop_store, |
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|
3623 uint oop_alias_idx, |
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|
3624 Node* index, |
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|
3625 Node* index_adr, |
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|
3626 Node* buffer, |
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|
3627 const TypeFunc* tf) { |
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3628 |
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3629 Node* zero = __ ConI(0); |
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|
3630 Node* no_base = __ top(); |
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3631 BasicType card_bt = T_BYTE; |
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3632 // Smash zero into card. MUST BE ORDERED WRT TO STORE |
985
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|
3633 __ storeCM(__ ctrl(), card_adr, zero, oop_store, oop_alias_idx, card_bt, Compile::AliasIdxRaw); |
342
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3634 |
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3635 // Now do the queue work |
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3636 __ if_then(index, BoolTest::ne, zero); { |
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3637 |
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3638 Node* next_index = __ SubI(index, __ ConI(sizeof(intptr_t))); |
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3639 Node* next_indexX = next_index; |
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3640 #ifdef _LP64 |
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3641 // We could refine the type for what it's worth |
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3642 // const TypeLong* lidxtype = TypeLong::make(CONST64(0), get_size_from_queue); |
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3643 next_indexX = _gvn.transform( new (C) ConvI2LNode(next_index, TypeLong::make(0, max_jlong, Type::WidenMax)) ); |
342
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3644 #endif // _LP64 |
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3645 Node* log_addr = __ AddP(no_base, buffer, next_indexX); |
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3646 |
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3647 __ store(__ ctrl(), log_addr, card_adr, T_ADDRESS, Compile::AliasIdxRaw); |
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3648 __ store(__ ctrl(), index_adr, next_index, T_INT, Compile::AliasIdxRaw); |
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3649 |
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3650 } __ else_(); { |
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3651 __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), "g1_wb_post", card_adr, __ thread()); |
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3652 } __ end_if(); |
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3653 |
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3654 } |
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3655 |
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3656 void GraphKit::g1_write_barrier_post(Node* oop_store, |
342
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3657 Node* obj, |
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3658 Node* adr, |
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3659 uint alias_idx, |
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3660 Node* val, |
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3661 BasicType bt, |
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3662 bool use_precise) { |
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3663 // If we are writing a NULL then we need no post barrier |
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3664 |
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3665 if (val != NULL && val->is_Con() && val->bottom_type() == TypePtr::NULL_PTR) { |
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3666 // Must be NULL |
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3667 const Type* t = val->bottom_type(); |
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3668 assert(t == Type::TOP || t == TypePtr::NULL_PTR, "must be NULL"); |
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3669 // No post barrier if writing NULLx |
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3670 return; |
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3671 } |
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3672 |
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3673 if (!use_precise) { |
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3674 // All card marks for a (non-array) instance are in one place: |
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3675 adr = obj; |
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3676 } |
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3677 // (Else it's an array (or unknown), and we want more precise card marks.) |
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3678 assert(adr != NULL, ""); |
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3679 |
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3680 IdealKit ideal(this, true); |
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3681 |
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3682 Node* tls = __ thread(); // ThreadLocalStorage |
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3683 |
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3684 Node* no_base = __ top(); |
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3685 float likely = PROB_LIKELY(0.999); |
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3686 float unlikely = PROB_UNLIKELY(0.999); |
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3687 Node* zero = __ ConI(0); |
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3688 Node* zeroX = __ ConX(0); |
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3689 |
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3690 // Get the alias_index for raw card-mark memory |
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3691 const TypePtr* card_type = TypeRawPtr::BOTTOM; |
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3692 |
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3693 const TypeFunc *tf = OptoRuntime::g1_wb_post_Type(); |
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3694 |
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3695 // Offsets into the thread |
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3696 const int index_offset = in_bytes(JavaThread::dirty_card_queue_offset() + |
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3697 PtrQueue::byte_offset_of_index()); |
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3698 const int buffer_offset = in_bytes(JavaThread::dirty_card_queue_offset() + |
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3699 PtrQueue::byte_offset_of_buf()); |
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3700 |
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3701 // Pointers into the thread |
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3702 |
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3703 Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset)); |
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3704 Node* index_adr = __ AddP(no_base, tls, __ ConX(index_offset)); |
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3705 |
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3706 // Now some values |
1593
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3707 // Use ctrl to avoid hoisting these values past a safepoint, which could |
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3708 // potentially reset these fields in the JavaThread. |
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3709 Node* index = __ load(__ ctrl(), index_adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw); |
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3710 Node* buffer = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw); |
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3711 |
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3712 // Convert the store obj pointer to an int prior to doing math on it |
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3713 // Must use ctrl to prevent "integerized oop" existing across safepoint |
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3714 Node* cast = __ CastPX(__ ctrl(), adr); |
342
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3715 |
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3716 // Divide pointer by card size |
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3717 Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) ); |
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3718 |
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3719 // Combine card table base and card offset |
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3720 Node* card_adr = __ AddP(no_base, byte_map_base_node(), card_offset ); |
342
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3721 |
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3722 // If we know the value being stored does it cross regions? |
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3723 |
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3724 if (val != NULL) { |
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3725 // Does the store cause us to cross regions? |
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3726 |
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3727 // Should be able to do an unsigned compare of region_size instead of |
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3728 // and extra shift. Do we have an unsigned compare?? |
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3729 // Node* region_size = __ ConI(1 << HeapRegion::LogOfHRGrainBytes); |
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3730 Node* xor_res = __ URShiftX ( __ XorX( cast, __ CastPX(__ ctrl(), val)), __ ConI(HeapRegion::LogOfHRGrainBytes)); |
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3731 |
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3732 // if (xor_res == 0) same region so skip |
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3733 __ if_then(xor_res, BoolTest::ne, zeroX); { |
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3734 |
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3735 // No barrier if we are storing a NULL |
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3736 __ if_then(val, BoolTest::ne, null(), unlikely); { |
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3737 |
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3738 // Ok must mark the card if not already dirty |
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|
3739 |
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3740 // load the original value of the card |
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3741 Node* card_val = __ load(__ ctrl(), card_adr, TypeInt::INT, T_BYTE, Compile::AliasIdxRaw); |
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3742 |
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3743 __ if_then(card_val, BoolTest::ne, zero); { |
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3744 g1_mark_card(ideal, card_adr, oop_store, alias_idx, index, index_adr, buffer, tf); |
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3745 } __ end_if(); |
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3746 } __ end_if(); |
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3747 } __ end_if(); |
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3748 } else { |
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|
3749 // Object.clone() instrinsic uses this path. |
985
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3750 g1_mark_card(ideal, card_adr, oop_store, alias_idx, index, index_adr, buffer, tf); |
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3751 } |
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3752 |
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|
3753 // Final sync IdealKit and GraphKit. |
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|
3754 final_sync(ideal); |
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3755 } |
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3756 #undef __ |
6057 | 3757 |
3758 | |
3759 | |
3760 Node* GraphKit::load_String_offset(Node* ctrl, Node* str) { | |
3761 if (java_lang_String::has_offset_field()) { | |
3762 int offset_offset = java_lang_String::offset_offset_in_bytes(); | |
3763 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), | |
3764 false, NULL, 0); | |
3765 const TypePtr* offset_field_type = string_type->add_offset(offset_offset); | |
3766 int offset_field_idx = C->get_alias_index(offset_field_type); | |
3767 return make_load(ctrl, | |
3768 basic_plus_adr(str, str, offset_offset), | |
3769 TypeInt::INT, T_INT, offset_field_idx); | |
3770 } else { | |
3771 return intcon(0); | |
3772 } | |
3773 } | |
3774 | |
3775 Node* GraphKit::load_String_length(Node* ctrl, Node* str) { | |
3776 if (java_lang_String::has_count_field()) { | |
3777 int count_offset = java_lang_String::count_offset_in_bytes(); | |
3778 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), | |
3779 false, NULL, 0); | |
3780 const TypePtr* count_field_type = string_type->add_offset(count_offset); | |
3781 int count_field_idx = C->get_alias_index(count_field_type); | |
3782 return make_load(ctrl, | |
3783 basic_plus_adr(str, str, count_offset), | |
3784 TypeInt::INT, T_INT, count_field_idx); | |
3785 } else { | |
3786 return load_array_length(load_String_value(ctrl, str)); | |
3787 } | |
3788 } | |
3789 | |
3790 Node* GraphKit::load_String_value(Node* ctrl, Node* str) { | |
3791 int value_offset = java_lang_String::value_offset_in_bytes(); | |
3792 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), | |
3793 false, NULL, 0); | |
3794 const TypePtr* value_field_type = string_type->add_offset(value_offset); | |
3795 const TypeAryPtr* value_type = TypeAryPtr::make(TypePtr::NotNull, | |
3796 TypeAry::make(TypeInt::CHAR,TypeInt::POS), | |
3797 ciTypeArrayKlass::make(T_CHAR), true, 0); | |
3798 int value_field_idx = C->get_alias_index(value_field_type); | |
3799 return make_load(ctrl, basic_plus_adr(str, str, value_offset), | |
3800 value_type, T_OBJECT, value_field_idx); | |
3801 } | |
3802 | |
3803 void GraphKit::store_String_offset(Node* ctrl, Node* str, Node* value) { | |
3804 int offset_offset = java_lang_String::offset_offset_in_bytes(); | |
3805 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), | |
3806 false, NULL, 0); | |
3807 const TypePtr* offset_field_type = string_type->add_offset(offset_offset); | |
3808 int offset_field_idx = C->get_alias_index(offset_field_type); | |
3809 store_to_memory(ctrl, basic_plus_adr(str, offset_offset), | |
3810 value, T_INT, offset_field_idx); | |
3811 } | |
3812 | |
3813 void GraphKit::store_String_value(Node* ctrl, Node* str, Node* value) { | |
3814 int value_offset = java_lang_String::value_offset_in_bytes(); | |
3815 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), | |
3816 false, NULL, 0); | |
3817 const TypePtr* value_field_type = string_type->add_offset(value_offset); | |
3818 const TypeAryPtr* value_type = TypeAryPtr::make(TypePtr::NotNull, | |
3819 TypeAry::make(TypeInt::CHAR,TypeInt::POS), | |
3820 ciTypeArrayKlass::make(T_CHAR), true, 0); | |
3821 int value_field_idx = C->get_alias_index(value_field_type); | |
3822 store_to_memory(ctrl, basic_plus_adr(str, value_offset), | |
3823 value, T_OBJECT, value_field_idx); | |
3824 } | |
3825 | |
3826 void GraphKit::store_String_length(Node* ctrl, Node* str, Node* value) { | |
3827 int count_offset = java_lang_String::count_offset_in_bytes(); | |
3828 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), | |
3829 false, NULL, 0); | |
3830 const TypePtr* count_field_type = string_type->add_offset(count_offset); | |
3831 int count_field_idx = C->get_alias_index(count_field_type); | |
3832 store_to_memory(ctrl, basic_plus_adr(str, count_offset), | |
3833 value, T_INT, count_field_idx); | |
3834 } |