Mercurial > hg > graal-compiler
annotate src/share/vm/opto/graphKit.cpp @ 2302:da091bb67459
7022037: Pause when exiting if debugger is attached on windows
Reviewed-by: dsamersoff, kamg, hosterda
author | sla |
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date | Mon, 28 Feb 2011 14:19:52 +0100 |
parents | 5ddfcf4b079e |
children | 9dc311b8473e |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2010, 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 | |
96 #ifdef ASSERT | |
97 bool GraphKit::jvms_in_sync() const { | |
98 Parse* parse = is_Parse(); | |
99 if (parse == NULL) { | |
100 if (bci() != jvms()->bci()) return false; | |
101 if (sp() != (int)jvms()->sp()) return false; | |
102 return true; | |
103 } | |
104 if (jvms()->method() != parse->method()) return false; | |
105 if (jvms()->bci() != parse->bci()) return false; | |
106 int jvms_sp = jvms()->sp(); | |
107 if (jvms_sp != parse->sp()) return false; | |
108 int jvms_depth = jvms()->depth(); | |
109 if (jvms_depth != parse->depth()) return false; | |
110 return true; | |
111 } | |
112 | |
113 // Local helper checks for special internal merge points | |
114 // used to accumulate and merge exception states. | |
115 // They are marked by the region's in(0) edge being the map itself. | |
116 // Such merge points must never "escape" into the parser at large, | |
117 // until they have been handed to gvn.transform. | |
118 static bool is_hidden_merge(Node* reg) { | |
119 if (reg == NULL) return false; | |
120 if (reg->is_Phi()) { | |
121 reg = reg->in(0); | |
122 if (reg == NULL) return false; | |
123 } | |
124 return reg->is_Region() && reg->in(0) != NULL && reg->in(0)->is_Root(); | |
125 } | |
126 | |
127 void GraphKit::verify_map() const { | |
128 if (map() == NULL) return; // null map is OK | |
129 assert(map()->req() <= jvms()->endoff(), "no extra garbage on map"); | |
130 assert(!map()->has_exceptions(), "call add_exception_states_from 1st"); | |
131 assert(!is_hidden_merge(control()), "call use_exception_state, not set_map"); | |
132 } | |
133 | |
134 void GraphKit::verify_exception_state(SafePointNode* ex_map) { | |
135 assert(ex_map->next_exception() == NULL, "not already part of a chain"); | |
136 assert(has_saved_ex_oop(ex_map), "every exception state has an ex_oop"); | |
137 } | |
138 #endif | |
139 | |
140 //---------------------------stop_and_kill_map--------------------------------- | |
141 // Set _map to NULL, signalling a stop to further bytecode execution. | |
142 // First smash the current map's control to a constant, to mark it dead. | |
143 void GraphKit::stop_and_kill_map() { | |
144 SafePointNode* dead_map = stop(); | |
145 if (dead_map != NULL) { | |
146 dead_map->disconnect_inputs(NULL); // Mark the map as killed. | |
147 assert(dead_map->is_killed(), "must be so marked"); | |
148 } | |
149 } | |
150 | |
151 | |
152 //--------------------------------stopped-------------------------------------- | |
153 // Tell if _map is NULL, or control is top. | |
154 bool GraphKit::stopped() { | |
155 if (map() == NULL) return true; | |
156 else if (control() == top()) return true; | |
157 else return false; | |
158 } | |
159 | |
160 | |
161 //-----------------------------has_ex_handler---------------------------------- | |
162 // Tell if this method or any caller method has exception handlers. | |
163 bool GraphKit::has_ex_handler() { | |
164 for (JVMState* jvmsp = jvms(); jvmsp != NULL; jvmsp = jvmsp->caller()) { | |
165 if (jvmsp->has_method() && jvmsp->method()->has_exception_handlers()) { | |
166 return true; | |
167 } | |
168 } | |
169 return false; | |
170 } | |
171 | |
172 //------------------------------save_ex_oop------------------------------------ | |
173 // Save an exception without blowing stack contents or other JVM state. | |
174 void GraphKit::set_saved_ex_oop(SafePointNode* ex_map, Node* ex_oop) { | |
175 assert(!has_saved_ex_oop(ex_map), "clear ex-oop before setting again"); | |
176 ex_map->add_req(ex_oop); | |
177 debug_only(verify_exception_state(ex_map)); | |
178 } | |
179 | |
180 inline static Node* common_saved_ex_oop(SafePointNode* ex_map, bool clear_it) { | |
181 assert(GraphKit::has_saved_ex_oop(ex_map), "ex_oop must be there"); | |
182 Node* ex_oop = ex_map->in(ex_map->req()-1); | |
183 if (clear_it) ex_map->del_req(ex_map->req()-1); | |
184 return ex_oop; | |
185 } | |
186 | |
187 //-----------------------------saved_ex_oop------------------------------------ | |
188 // Recover a saved exception from its map. | |
189 Node* GraphKit::saved_ex_oop(SafePointNode* ex_map) { | |
190 return common_saved_ex_oop(ex_map, false); | |
191 } | |
192 | |
193 //--------------------------clear_saved_ex_oop--------------------------------- | |
194 // Erase a previously saved exception from its map. | |
195 Node* GraphKit::clear_saved_ex_oop(SafePointNode* ex_map) { | |
196 return common_saved_ex_oop(ex_map, true); | |
197 } | |
198 | |
199 #ifdef ASSERT | |
200 //---------------------------has_saved_ex_oop---------------------------------- | |
201 // Erase a previously saved exception from its map. | |
202 bool GraphKit::has_saved_ex_oop(SafePointNode* ex_map) { | |
203 return ex_map->req() == ex_map->jvms()->endoff()+1; | |
204 } | |
205 #endif | |
206 | |
207 //-------------------------make_exception_state-------------------------------- | |
208 // Turn the current JVM state into an exception state, appending the ex_oop. | |
209 SafePointNode* GraphKit::make_exception_state(Node* ex_oop) { | |
210 sync_jvms(); | |
211 SafePointNode* ex_map = stop(); // do not manipulate this map any more | |
212 set_saved_ex_oop(ex_map, ex_oop); | |
213 return ex_map; | |
214 } | |
215 | |
216 | |
217 //--------------------------add_exception_state-------------------------------- | |
218 // Add an exception to my list of exceptions. | |
219 void GraphKit::add_exception_state(SafePointNode* ex_map) { | |
220 if (ex_map == NULL || ex_map->control() == top()) { | |
221 return; | |
222 } | |
223 #ifdef ASSERT | |
224 verify_exception_state(ex_map); | |
225 if (has_exceptions()) { | |
226 assert(ex_map->jvms()->same_calls_as(_exceptions->jvms()), "all collected exceptions must come from the same place"); | |
227 } | |
228 #endif | |
229 | |
230 // If there is already an exception of exactly this type, merge with it. | |
231 // In particular, null-checks and other low-level exceptions common up here. | |
232 Node* ex_oop = saved_ex_oop(ex_map); | |
233 const Type* ex_type = _gvn.type(ex_oop); | |
234 if (ex_oop == top()) { | |
235 // No action needed. | |
236 return; | |
237 } | |
238 assert(ex_type->isa_instptr(), "exception must be an instance"); | |
239 for (SafePointNode* e2 = _exceptions; e2 != NULL; e2 = e2->next_exception()) { | |
240 const Type* ex_type2 = _gvn.type(saved_ex_oop(e2)); | |
241 // We check sp also because call bytecodes can generate exceptions | |
242 // both before and after arguments are popped! | |
243 if (ex_type2 == ex_type | |
244 && e2->_jvms->sp() == ex_map->_jvms->sp()) { | |
245 combine_exception_states(ex_map, e2); | |
246 return; | |
247 } | |
248 } | |
249 | |
250 // No pre-existing exception of the same type. Chain it on the list. | |
251 push_exception_state(ex_map); | |
252 } | |
253 | |
254 //-----------------------add_exception_states_from----------------------------- | |
255 void GraphKit::add_exception_states_from(JVMState* jvms) { | |
256 SafePointNode* ex_map = jvms->map()->next_exception(); | |
257 if (ex_map != NULL) { | |
258 jvms->map()->set_next_exception(NULL); | |
259 for (SafePointNode* next_map; ex_map != NULL; ex_map = next_map) { | |
260 next_map = ex_map->next_exception(); | |
261 ex_map->set_next_exception(NULL); | |
262 add_exception_state(ex_map); | |
263 } | |
264 } | |
265 } | |
266 | |
267 //-----------------------transfer_exceptions_into_jvms------------------------- | |
268 JVMState* GraphKit::transfer_exceptions_into_jvms() { | |
269 if (map() == NULL) { | |
270 // We need a JVMS to carry the exceptions, but the map has gone away. | |
271 // Create a scratch JVMS, cloned from any of the exception states... | |
272 if (has_exceptions()) { | |
273 _map = _exceptions; | |
274 _map = clone_map(); | |
275 _map->set_next_exception(NULL); | |
276 clear_saved_ex_oop(_map); | |
277 debug_only(verify_map()); | |
278 } else { | |
279 // ...or created from scratch | |
280 JVMState* jvms = new (C) JVMState(_method, NULL); | |
281 jvms->set_bci(_bci); | |
282 jvms->set_sp(_sp); | |
283 jvms->set_map(new (C, TypeFunc::Parms) SafePointNode(TypeFunc::Parms, jvms)); | |
284 set_jvms(jvms); | |
285 for (uint i = 0; i < map()->req(); i++) map()->init_req(i, top()); | |
286 set_all_memory(top()); | |
287 while (map()->req() < jvms->endoff()) map()->add_req(top()); | |
288 } | |
289 // (This is a kludge, in case you didn't notice.) | |
290 set_control(top()); | |
291 } | |
292 JVMState* jvms = sync_jvms(); | |
293 assert(!jvms->map()->has_exceptions(), "no exceptions on this map yet"); | |
294 jvms->map()->set_next_exception(_exceptions); | |
295 _exceptions = NULL; // done with this set of exceptions | |
296 return jvms; | |
297 } | |
298 | |
299 static inline void add_n_reqs(Node* dstphi, Node* srcphi) { | |
300 assert(is_hidden_merge(dstphi), "must be a special merge node"); | |
301 assert(is_hidden_merge(srcphi), "must be a special merge node"); | |
302 uint limit = srcphi->req(); | |
303 for (uint i = PhiNode::Input; i < limit; i++) { | |
304 dstphi->add_req(srcphi->in(i)); | |
305 } | |
306 } | |
307 static inline void add_one_req(Node* dstphi, Node* src) { | |
308 assert(is_hidden_merge(dstphi), "must be a special merge node"); | |
309 assert(!is_hidden_merge(src), "must not be a special merge node"); | |
310 dstphi->add_req(src); | |
311 } | |
312 | |
313 //-----------------------combine_exception_states------------------------------ | |
314 // This helper function combines exception states by building phis on a | |
315 // specially marked state-merging region. These regions and phis are | |
316 // untransformed, and can build up gradually. The region is marked by | |
317 // having a control input of its exception map, rather than NULL. Such | |
318 // regions do not appear except in this function, and in use_exception_state. | |
319 void GraphKit::combine_exception_states(SafePointNode* ex_map, SafePointNode* phi_map) { | |
320 if (failing()) return; // dying anyway... | |
321 JVMState* ex_jvms = ex_map->_jvms; | |
322 assert(ex_jvms->same_calls_as(phi_map->_jvms), "consistent call chains"); | |
323 assert(ex_jvms->stkoff() == phi_map->_jvms->stkoff(), "matching locals"); | |
324 assert(ex_jvms->sp() == phi_map->_jvms->sp(), "matching stack sizes"); | |
325 assert(ex_jvms->monoff() == phi_map->_jvms->monoff(), "matching JVMS"); | |
326 assert(ex_map->req() == phi_map->req(), "matching maps"); | |
327 uint tos = ex_jvms->stkoff() + ex_jvms->sp(); | |
328 Node* hidden_merge_mark = root(); | |
329 Node* region = phi_map->control(); | |
330 MergeMemNode* phi_mem = phi_map->merged_memory(); | |
331 MergeMemNode* ex_mem = ex_map->merged_memory(); | |
332 if (region->in(0) != hidden_merge_mark) { | |
333 // The control input is not (yet) a specially-marked region in phi_map. | |
334 // Make it so, and build some phis. | |
335 region = new (C, 2) RegionNode(2); | |
336 _gvn.set_type(region, Type::CONTROL); | |
337 region->set_req(0, hidden_merge_mark); // marks an internal ex-state | |
338 region->init_req(1, phi_map->control()); | |
339 phi_map->set_control(region); | |
340 Node* io_phi = PhiNode::make(region, phi_map->i_o(), Type::ABIO); | |
341 record_for_igvn(io_phi); | |
342 _gvn.set_type(io_phi, Type::ABIO); | |
343 phi_map->set_i_o(io_phi); | |
344 for (MergeMemStream mms(phi_mem); mms.next_non_empty(); ) { | |
345 Node* m = mms.memory(); | |
346 Node* m_phi = PhiNode::make(region, m, Type::MEMORY, mms.adr_type(C)); | |
347 record_for_igvn(m_phi); | |
348 _gvn.set_type(m_phi, Type::MEMORY); | |
349 mms.set_memory(m_phi); | |
350 } | |
351 } | |
352 | |
353 // Either or both of phi_map and ex_map might already be converted into phis. | |
354 Node* ex_control = ex_map->control(); | |
355 // if there is special marking on ex_map also, we add multiple edges from src | |
356 bool add_multiple = (ex_control->in(0) == hidden_merge_mark); | |
357 // how wide was the destination phi_map, originally? | |
358 uint orig_width = region->req(); | |
359 | |
360 if (add_multiple) { | |
361 add_n_reqs(region, ex_control); | |
362 add_n_reqs(phi_map->i_o(), ex_map->i_o()); | |
363 } else { | |
364 // ex_map has no merges, so we just add single edges everywhere | |
365 add_one_req(region, ex_control); | |
366 add_one_req(phi_map->i_o(), ex_map->i_o()); | |
367 } | |
368 for (MergeMemStream mms(phi_mem, ex_mem); mms.next_non_empty2(); ) { | |
369 if (mms.is_empty()) { | |
370 // get a copy of the base memory, and patch some inputs into it | |
371 const TypePtr* adr_type = mms.adr_type(C); | |
372 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type); | |
373 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), ""); | |
374 mms.set_memory(phi); | |
375 // Prepare to append interesting stuff onto the newly sliced phi: | |
376 while (phi->req() > orig_width) phi->del_req(phi->req()-1); | |
377 } | |
378 // Append stuff from ex_map: | |
379 if (add_multiple) { | |
380 add_n_reqs(mms.memory(), mms.memory2()); | |
381 } else { | |
382 add_one_req(mms.memory(), mms.memory2()); | |
383 } | |
384 } | |
385 uint limit = ex_map->req(); | |
386 for (uint i = TypeFunc::Parms; i < limit; i++) { | |
387 // Skip everything in the JVMS after tos. (The ex_oop follows.) | |
388 if (i == tos) i = ex_jvms->monoff(); | |
389 Node* src = ex_map->in(i); | |
390 Node* dst = phi_map->in(i); | |
391 if (src != dst) { | |
392 PhiNode* phi; | |
393 if (dst->in(0) != region) { | |
394 dst = phi = PhiNode::make(region, dst, _gvn.type(dst)); | |
395 record_for_igvn(phi); | |
396 _gvn.set_type(phi, phi->type()); | |
397 phi_map->set_req(i, dst); | |
398 // Prepare to append interesting stuff onto the new phi: | |
399 while (dst->req() > orig_width) dst->del_req(dst->req()-1); | |
400 } else { | |
401 assert(dst->is_Phi(), "nobody else uses a hidden region"); | |
402 phi = (PhiNode*)dst; | |
403 } | |
404 if (add_multiple && src->in(0) == ex_control) { | |
405 // Both are phis. | |
406 add_n_reqs(dst, src); | |
407 } else { | |
408 while (dst->req() < region->req()) add_one_req(dst, src); | |
409 } | |
410 const Type* srctype = _gvn.type(src); | |
411 if (phi->type() != srctype) { | |
412 const Type* dsttype = phi->type()->meet(srctype); | |
413 if (phi->type() != dsttype) { | |
414 phi->set_type(dsttype); | |
415 _gvn.set_type(phi, dsttype); | |
416 } | |
417 } | |
418 } | |
419 } | |
420 } | |
421 | |
422 //--------------------------use_exception_state-------------------------------- | |
423 Node* GraphKit::use_exception_state(SafePointNode* phi_map) { | |
424 if (failing()) { stop(); return top(); } | |
425 Node* region = phi_map->control(); | |
426 Node* hidden_merge_mark = root(); | |
427 assert(phi_map->jvms()->map() == phi_map, "sanity: 1-1 relation"); | |
428 Node* ex_oop = clear_saved_ex_oop(phi_map); | |
429 if (region->in(0) == hidden_merge_mark) { | |
430 // Special marking for internal ex-states. Process the phis now. | |
431 region->set_req(0, region); // now it's an ordinary region | |
432 set_jvms(phi_map->jvms()); // ...so now we can use it as a map | |
433 // Note: Setting the jvms also sets the bci and sp. | |
434 set_control(_gvn.transform(region)); | |
435 uint tos = jvms()->stkoff() + sp(); | |
436 for (uint i = 1; i < tos; i++) { | |
437 Node* x = phi_map->in(i); | |
438 if (x->in(0) == region) { | |
439 assert(x->is_Phi(), "expected a special phi"); | |
440 phi_map->set_req(i, _gvn.transform(x)); | |
441 } | |
442 } | |
443 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) { | |
444 Node* x = mms.memory(); | |
445 if (x->in(0) == region) { | |
446 assert(x->is_Phi(), "nobody else uses a hidden region"); | |
447 mms.set_memory(_gvn.transform(x)); | |
448 } | |
449 } | |
450 if (ex_oop->in(0) == region) { | |
451 assert(ex_oop->is_Phi(), "expected a special phi"); | |
452 ex_oop = _gvn.transform(ex_oop); | |
453 } | |
454 } else { | |
455 set_jvms(phi_map->jvms()); | |
456 } | |
457 | |
458 assert(!is_hidden_merge(phi_map->control()), "hidden ex. states cleared"); | |
459 assert(!is_hidden_merge(phi_map->i_o()), "hidden ex. states cleared"); | |
460 return ex_oop; | |
461 } | |
462 | |
463 //---------------------------------java_bc------------------------------------- | |
464 Bytecodes::Code GraphKit::java_bc() const { | |
465 ciMethod* method = this->method(); | |
466 int bci = this->bci(); | |
467 if (method != NULL && bci != InvocationEntryBci) | |
468 return method->java_code_at_bci(bci); | |
469 else | |
470 return Bytecodes::_illegal; | |
471 } | |
472 | |
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473 void GraphKit::uncommon_trap_if_should_post_on_exceptions(Deoptimization::DeoptReason reason, |
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474 bool must_throw) { |
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475 // if the exception capability is set, then we will generate code |
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476 // to check the JavaThread.should_post_on_exceptions flag to see |
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477 // if we actually need to report exception events (for this |
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478 // thread). If we don't need to report exception events, we will |
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479 // take the normal fast path provided by add_exception_events. If |
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480 // exception event reporting is enabled for this thread, we will |
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481 // take the uncommon_trap in the BuildCutout below. |
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482 |
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483 // first must access the should_post_on_exceptions_flag in this thread's JavaThread |
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484 Node* jthread = _gvn.transform(new (C, 1) ThreadLocalNode()); |
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485 Node* adr = basic_plus_adr(top(), jthread, in_bytes(JavaThread::should_post_on_exceptions_flag_offset())); |
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486 Node* should_post_flag = make_load(control(), adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw, false); |
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487 |
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488 // Test the should_post_on_exceptions_flag vs. 0 |
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489 Node* chk = _gvn.transform( new (C, 3) CmpINode(should_post_flag, intcon(0)) ); |
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490 Node* tst = _gvn.transform( new (C, 2) BoolNode(chk, BoolTest::eq) ); |
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491 |
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492 // Branch to slow_path if should_post_on_exceptions_flag was true |
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493 { BuildCutout unless(this, tst, PROB_MAX); |
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494 // Do not try anything fancy if we're notifying the VM on every throw. |
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495 // Cf. case Bytecodes::_athrow in parse2.cpp. |
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496 uncommon_trap(reason, Deoptimization::Action_none, |
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497 (ciKlass*)NULL, (char*)NULL, must_throw); |
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498 } |
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499 |
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500 } |
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501 |
0 | 502 //------------------------------builtin_throw---------------------------------- |
503 void GraphKit::builtin_throw(Deoptimization::DeoptReason reason, Node* arg) { | |
504 bool must_throw = true; | |
505 | |
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506 if (env()->jvmti_can_post_on_exceptions()) { |
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507 // check if we must post exception events, take uncommon trap if so |
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508 uncommon_trap_if_should_post_on_exceptions(reason, must_throw); |
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509 // here if should_post_on_exceptions is false |
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510 // continue on with the normal codegen |
0 | 511 } |
512 | |
513 // If this particular condition has not yet happened at this | |
514 // bytecode, then use the uncommon trap mechanism, and allow for | |
515 // a future recompilation if several traps occur here. | |
516 // If the throw is hot, try to use a more complicated inline mechanism | |
517 // which keeps execution inside the compiled code. | |
518 bool treat_throw_as_hot = false; | |
519 ciMethodData* md = method()->method_data(); | |
520 | |
521 if (ProfileTraps) { | |
522 if (too_many_traps(reason)) { | |
523 treat_throw_as_hot = true; | |
524 } | |
525 // (If there is no MDO at all, assume it is early in | |
526 // execution, and that any deopts are part of the | |
527 // startup transient, and don't need to be remembered.) | |
528 | |
529 // Also, if there is a local exception handler, treat all throws | |
530 // as hot if there has been at least one in this method. | |
531 if (C->trap_count(reason) != 0 | |
532 && method()->method_data()->trap_count(reason) != 0 | |
533 && has_ex_handler()) { | |
534 treat_throw_as_hot = true; | |
535 } | |
536 } | |
537 | |
538 // If this throw happens frequently, an uncommon trap might cause | |
539 // a performance pothole. If there is a local exception handler, | |
540 // and if this particular bytecode appears to be deoptimizing often, | |
541 // let us handle the throw inline, with a preconstructed instance. | |
542 // Note: If the deopt count has blown up, the uncommon trap | |
543 // runtime is going to flush this nmethod, not matter what. | |
544 if (treat_throw_as_hot | |
545 && (!StackTraceInThrowable || OmitStackTraceInFastThrow)) { | |
546 // If the throw is local, we use a pre-existing instance and | |
547 // punt on the backtrace. This would lead to a missing backtrace | |
548 // (a repeat of 4292742) if the backtrace object is ever asked | |
549 // for its backtrace. | |
550 // Fixing this remaining case of 4292742 requires some flavor of | |
551 // escape analysis. Leave that for the future. | |
552 ciInstance* ex_obj = NULL; | |
553 switch (reason) { | |
554 case Deoptimization::Reason_null_check: | |
555 ex_obj = env()->NullPointerException_instance(); | |
556 break; | |
557 case Deoptimization::Reason_div0_check: | |
558 ex_obj = env()->ArithmeticException_instance(); | |
559 break; | |
560 case Deoptimization::Reason_range_check: | |
561 ex_obj = env()->ArrayIndexOutOfBoundsException_instance(); | |
562 break; | |
563 case Deoptimization::Reason_class_check: | |
564 if (java_bc() == Bytecodes::_aastore) { | |
565 ex_obj = env()->ArrayStoreException_instance(); | |
566 } else { | |
567 ex_obj = env()->ClassCastException_instance(); | |
568 } | |
569 break; | |
570 } | |
571 if (failing()) { stop(); return; } // exception allocation might fail | |
572 if (ex_obj != NULL) { | |
573 // Cheat with a preallocated exception object. | |
574 if (C->log() != NULL) | |
575 C->log()->elem("hot_throw preallocated='1' reason='%s'", | |
576 Deoptimization::trap_reason_name(reason)); | |
577 const TypeInstPtr* ex_con = TypeInstPtr::make(ex_obj); | |
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578 Node* ex_node = _gvn.transform( ConNode::make(C, ex_con) ); |
0 | 579 |
580 // Clear the detail message of the preallocated exception object. | |
581 // Weblogic sometimes mutates the detail message of exceptions | |
582 // using reflection. | |
583 int offset = java_lang_Throwable::get_detailMessage_offset(); | |
584 const TypePtr* adr_typ = ex_con->add_offset(offset); | |
585 | |
586 Node *adr = basic_plus_adr(ex_node, ex_node, offset); | |
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587 const TypeOopPtr* val_type = TypeOopPtr::make_from_klass(env()->String_klass()); |
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588 Node *store = store_oop_to_object(control(), ex_node, adr, adr_typ, null(), val_type, T_OBJECT); |
0 | 589 |
590 add_exception_state(make_exception_state(ex_node)); | |
591 return; | |
592 } | |
593 } | |
594 | |
595 // %%% Maybe add entry to OptoRuntime which directly throws the exc.? | |
596 // It won't be much cheaper than bailing to the interp., since we'll | |
597 // have to pass up all the debug-info, and the runtime will have to | |
598 // create the stack trace. | |
599 | |
600 // Usual case: Bail to interpreter. | |
601 // Reserve the right to recompile if we haven't seen anything yet. | |
602 | |
603 Deoptimization::DeoptAction action = Deoptimization::Action_maybe_recompile; | |
604 if (treat_throw_as_hot | |
605 && (method()->method_data()->trap_recompiled_at(bci()) | |
606 || C->too_many_traps(reason))) { | |
607 // We cannot afford to take more traps here. Suffer in the interpreter. | |
608 if (C->log() != NULL) | |
609 C->log()->elem("hot_throw preallocated='0' reason='%s' mcount='%d'", | |
610 Deoptimization::trap_reason_name(reason), | |
611 C->trap_count(reason)); | |
612 action = Deoptimization::Action_none; | |
613 } | |
614 | |
615 // "must_throw" prunes the JVM state to include only the stack, if there | |
616 // are no local exception handlers. This should cut down on register | |
617 // allocation time and code size, by drastically reducing the number | |
618 // of in-edges on the call to the uncommon trap. | |
619 | |
620 uncommon_trap(reason, action, (ciKlass*)NULL, (char*)NULL, must_throw); | |
621 } | |
622 | |
623 | |
624 //----------------------------PreserveJVMState--------------------------------- | |
625 PreserveJVMState::PreserveJVMState(GraphKit* kit, bool clone_map) { | |
626 debug_only(kit->verify_map()); | |
627 _kit = kit; | |
628 _map = kit->map(); // preserve the map | |
629 _sp = kit->sp(); | |
630 kit->set_map(clone_map ? kit->clone_map() : NULL); | |
631 #ifdef ASSERT | |
632 _bci = kit->bci(); | |
633 Parse* parser = kit->is_Parse(); | |
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634 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); |
0 | 635 _block = block; |
636 #endif | |
637 } | |
638 PreserveJVMState::~PreserveJVMState() { | |
639 GraphKit* kit = _kit; | |
640 #ifdef ASSERT | |
641 assert(kit->bci() == _bci, "bci must not shift"); | |
642 Parse* parser = kit->is_Parse(); | |
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643 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); |
0 | 644 assert(block == _block, "block must not shift"); |
645 #endif | |
646 kit->set_map(_map); | |
647 kit->set_sp(_sp); | |
648 } | |
649 | |
650 | |
651 //-----------------------------BuildCutout------------------------------------- | |
652 BuildCutout::BuildCutout(GraphKit* kit, Node* p, float prob, float cnt) | |
653 : PreserveJVMState(kit) | |
654 { | |
655 assert(p->is_Con() || p->is_Bool(), "test must be a bool"); | |
656 SafePointNode* outer_map = _map; // preserved map is caller's | |
657 SafePointNode* inner_map = kit->map(); | |
658 IfNode* iff = kit->create_and_map_if(outer_map->control(), p, prob, cnt); | |
659 outer_map->set_control(kit->gvn().transform( new (kit->C, 1) IfTrueNode(iff) )); | |
660 inner_map->set_control(kit->gvn().transform( new (kit->C, 1) IfFalseNode(iff) )); | |
661 } | |
662 BuildCutout::~BuildCutout() { | |
663 GraphKit* kit = _kit; | |
664 assert(kit->stopped(), "cutout code must stop, throw, return, etc."); | |
665 } | |
666 | |
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667 //---------------------------PreserveReexecuteState---------------------------- |
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668 PreserveReexecuteState::PreserveReexecuteState(GraphKit* kit) { |
950
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669 assert(!kit->stopped(), "must call stopped() before"); |
900
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670 _kit = kit; |
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671 _sp = kit->sp(); |
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672 _reexecute = kit->jvms()->_reexecute; |
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673 } |
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674 PreserveReexecuteState::~PreserveReexecuteState() { |
950
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675 if (_kit->stopped()) return; |
900
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676 _kit->jvms()->_reexecute = _reexecute; |
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677 _kit->set_sp(_sp); |
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678 } |
0 | 679 |
680 //------------------------------clone_map-------------------------------------- | |
681 // Implementation of PreserveJVMState | |
682 // | |
683 // Only clone_map(...) here. If this function is only used in the | |
684 // PreserveJVMState class we may want to get rid of this extra | |
685 // function eventually and do it all there. | |
686 | |
687 SafePointNode* GraphKit::clone_map() { | |
688 if (map() == NULL) return NULL; | |
689 | |
690 // Clone the memory edge first | |
691 Node* mem = MergeMemNode::make(C, map()->memory()); | |
692 gvn().set_type_bottom(mem); | |
693 | |
694 SafePointNode *clonemap = (SafePointNode*)map()->clone(); | |
695 JVMState* jvms = this->jvms(); | |
696 JVMState* clonejvms = jvms->clone_shallow(C); | |
697 clonemap->set_memory(mem); | |
698 clonemap->set_jvms(clonejvms); | |
699 clonejvms->set_map(clonemap); | |
700 record_for_igvn(clonemap); | |
701 gvn().set_type_bottom(clonemap); | |
702 return clonemap; | |
703 } | |
704 | |
705 | |
706 //-----------------------------set_map_clone----------------------------------- | |
707 void GraphKit::set_map_clone(SafePointNode* m) { | |
708 _map = m; | |
709 _map = clone_map(); | |
710 _map->set_next_exception(NULL); | |
711 debug_only(verify_map()); | |
712 } | |
713 | |
714 | |
715 //----------------------------kill_dead_locals--------------------------------- | |
716 // Detect any locals which are known to be dead, and force them to top. | |
717 void GraphKit::kill_dead_locals() { | |
718 // Consult the liveness information for the locals. If any | |
719 // of them are unused, then they can be replaced by top(). This | |
720 // should help register allocation time and cut down on the size | |
721 // of the deoptimization information. | |
722 | |
723 // This call is made from many of the bytecode handling | |
724 // subroutines called from the Big Switch in do_one_bytecode. | |
725 // Every bytecode which might include a slow path is responsible | |
726 // for killing its dead locals. The more consistent we | |
727 // are about killing deads, the fewer useless phis will be | |
728 // constructed for them at various merge points. | |
729 | |
730 // bci can be -1 (InvocationEntryBci). We return the entry | |
731 // liveness for the method. | |
732 | |
733 if (method() == NULL || method()->code_size() == 0) { | |
734 // We are building a graph for a call to a native method. | |
735 // All locals are live. | |
736 return; | |
737 } | |
738 | |
739 ResourceMark rm; | |
740 | |
741 // Consult the liveness information for the locals. If any | |
742 // of them are unused, then they can be replaced by top(). This | |
743 // should help register allocation time and cut down on the size | |
744 // of the deoptimization information. | |
745 MethodLivenessResult live_locals = method()->liveness_at_bci(bci()); | |
746 | |
747 int len = (int)live_locals.size(); | |
748 assert(len <= jvms()->loc_size(), "too many live locals"); | |
749 for (int local = 0; local < len; local++) { | |
750 if (!live_locals.at(local)) { | |
751 set_local(local, top()); | |
752 } | |
753 } | |
754 } | |
755 | |
756 #ifdef ASSERT | |
757 //-------------------------dead_locals_are_killed------------------------------ | |
758 // Return true if all dead locals are set to top in the map. | |
759 // Used to assert "clean" debug info at various points. | |
760 bool GraphKit::dead_locals_are_killed() { | |
761 if (method() == NULL || method()->code_size() == 0) { | |
762 // No locals need to be dead, so all is as it should be. | |
763 return true; | |
764 } | |
765 | |
766 // Make sure somebody called kill_dead_locals upstream. | |
767 ResourceMark rm; | |
768 for (JVMState* jvms = this->jvms(); jvms != NULL; jvms = jvms->caller()) { | |
769 if (jvms->loc_size() == 0) continue; // no locals to consult | |
770 SafePointNode* map = jvms->map(); | |
771 ciMethod* method = jvms->method(); | |
772 int bci = jvms->bci(); | |
773 if (jvms == this->jvms()) { | |
774 bci = this->bci(); // it might not yet be synched | |
775 } | |
776 MethodLivenessResult live_locals = method->liveness_at_bci(bci); | |
777 int len = (int)live_locals.size(); | |
778 if (!live_locals.is_valid() || len == 0) | |
779 // This method is trivial, or is poisoned by a breakpoint. | |
780 return true; | |
781 assert(len == jvms->loc_size(), "live map consistent with locals map"); | |
782 for (int local = 0; local < len; local++) { | |
783 if (!live_locals.at(local) && map->local(jvms, local) != top()) { | |
784 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
785 tty->print_cr("Zombie local %d: ", local); | |
786 jvms->dump(); | |
787 } | |
788 return false; | |
789 } | |
790 } | |
791 } | |
792 return true; | |
793 } | |
794 | |
795 #endif //ASSERT | |
796 | |
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797 // Helper function for enforcing certain bytecodes to reexecute if |
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798 // deoptimization happens |
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799 static bool should_reexecute_implied_by_bytecode(JVMState *jvms, bool is_anewarray) { |
900
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800 ciMethod* cur_method = jvms->method(); |
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801 int cur_bci = jvms->bci(); |
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802 if (cur_method != NULL && cur_bci != InvocationEntryBci) { |
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803 Bytecodes::Code code = cur_method->java_code_at_bci(cur_bci); |
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804 return Interpreter::bytecode_should_reexecute(code) || |
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805 is_anewarray && code == Bytecodes::_multianewarray; |
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806 // Reexecute _multianewarray bytecode which was replaced with |
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807 // sequence of [a]newarray. See Parse::do_multianewarray(). |
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808 // |
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809 // Note: interpreter should not have it set since this optimization |
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810 // is limited by dimensions and guarded by flag so in some cases |
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811 // multianewarray() runtime calls will be generated and |
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812 // the bytecode should not be reexecutes (stack will not be reset). |
900
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813 } else |
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814 return false; |
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815 } |
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816 |
0 | 817 // Helper function for adding JVMState and debug information to node |
818 void GraphKit::add_safepoint_edges(SafePointNode* call, bool must_throw) { | |
819 // Add the safepoint edges to the call (or other safepoint). | |
820 | |
821 // Make sure dead locals are set to top. This | |
822 // should help register allocation time and cut down on the size | |
823 // of the deoptimization information. | |
824 assert(dead_locals_are_killed(), "garbage in debug info before safepoint"); | |
825 | |
826 // Walk the inline list to fill in the correct set of JVMState's | |
827 // Also fill in the associated edges for each JVMState. | |
828 | |
829 JVMState* youngest_jvms = sync_jvms(); | |
830 | |
831 // If we are guaranteed to throw, we can prune everything but the | |
832 // input to the current bytecode. | |
833 bool can_prune_locals = false; | |
834 uint stack_slots_not_pruned = 0; | |
835 int inputs = 0, depth = 0; | |
836 if (must_throw) { | |
837 assert(method() == youngest_jvms->method(), "sanity"); | |
838 if (compute_stack_effects(inputs, depth)) { | |
839 can_prune_locals = true; | |
840 stack_slots_not_pruned = inputs; | |
841 } | |
842 } | |
843 | |
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844 if (env()->jvmti_can_access_local_variables()) { |
0 | 845 // At any safepoint, this method can get breakpointed, which would |
846 // then require an immediate deoptimization. | |
847 can_prune_locals = false; // do not prune locals | |
848 stack_slots_not_pruned = 0; | |
849 } | |
850 | |
851 // do not scribble on the input jvms | |
852 JVMState* out_jvms = youngest_jvms->clone_deep(C); | |
853 call->set_jvms(out_jvms); // Start jvms list for call node | |
854 | |
900
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855 // For a known set of bytecodes, the interpreter should reexecute them if |
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856 // deoptimization happens. We set the reexecute state for them here |
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857 if (out_jvms->is_reexecute_undefined() && //don't change if already specified |
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858 should_reexecute_implied_by_bytecode(out_jvms, call->is_AllocateArray())) { |
900
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859 out_jvms->set_should_reexecute(true); //NOTE: youngest_jvms not changed |
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860 } |
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861 |
0 | 862 // Presize the call: |
863 debug_only(uint non_debug_edges = call->req()); | |
864 call->add_req_batch(top(), youngest_jvms->debug_depth()); | |
865 assert(call->req() == non_debug_edges + youngest_jvms->debug_depth(), ""); | |
866 | |
867 // Set up edges so that the call looks like this: | |
868 // Call [state:] ctl io mem fptr retadr | |
869 // [parms:] parm0 ... parmN | |
870 // [root:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN | |
871 // [...mid:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN [...] | |
872 // [young:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN | |
873 // Note that caller debug info precedes callee debug info. | |
874 | |
875 // Fill pointer walks backwards from "young:" to "root:" in the diagram above: | |
876 uint debug_ptr = call->req(); | |
877 | |
878 // Loop over the map input edges associated with jvms, add them | |
879 // to the call node, & reset all offsets to match call node array. | |
880 for (JVMState* in_jvms = youngest_jvms; in_jvms != NULL; ) { | |
881 uint debug_end = debug_ptr; | |
882 uint debug_start = debug_ptr - in_jvms->debug_size(); | |
883 debug_ptr = debug_start; // back up the ptr | |
884 | |
885 uint p = debug_start; // walks forward in [debug_start, debug_end) | |
886 uint j, k, l; | |
887 SafePointNode* in_map = in_jvms->map(); | |
888 out_jvms->set_map(call); | |
889 | |
890 if (can_prune_locals) { | |
891 assert(in_jvms->method() == out_jvms->method(), "sanity"); | |
892 // If the current throw can reach an exception handler in this JVMS, | |
893 // then we must keep everything live that can reach that handler. | |
894 // As a quick and dirty approximation, we look for any handlers at all. | |
895 if (in_jvms->method()->has_exception_handlers()) { | |
896 can_prune_locals = false; | |
897 } | |
898 } | |
899 | |
900 // Add the Locals | |
901 k = in_jvms->locoff(); | |
902 l = in_jvms->loc_size(); | |
903 out_jvms->set_locoff(p); | |
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904 if (!can_prune_locals) { |
0 | 905 for (j = 0; j < l; j++) |
906 call->set_req(p++, in_map->in(k+j)); | |
907 } else { | |
908 p += l; // already set to top above by add_req_batch | |
909 } | |
910 | |
911 // Add the Expression Stack | |
912 k = in_jvms->stkoff(); | |
913 l = in_jvms->sp(); | |
914 out_jvms->set_stkoff(p); | |
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915 if (!can_prune_locals) { |
0 | 916 for (j = 0; j < l; j++) |
917 call->set_req(p++, in_map->in(k+j)); | |
918 } else if (can_prune_locals && stack_slots_not_pruned != 0) { | |
919 // Divide stack into {S0,...,S1}, where S0 is set to top. | |
920 uint s1 = stack_slots_not_pruned; | |
921 stack_slots_not_pruned = 0; // for next iteration | |
922 if (s1 > l) s1 = l; | |
923 uint s0 = l - s1; | |
924 p += s0; // skip the tops preinstalled by add_req_batch | |
925 for (j = s0; j < l; j++) | |
926 call->set_req(p++, in_map->in(k+j)); | |
927 } else { | |
928 p += l; // already set to top above by add_req_batch | |
929 } | |
930 | |
931 // Add the Monitors | |
932 k = in_jvms->monoff(); | |
933 l = in_jvms->mon_size(); | |
934 out_jvms->set_monoff(p); | |
935 for (j = 0; j < l; j++) | |
936 call->set_req(p++, in_map->in(k+j)); | |
937 | |
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938 // Copy any scalar object fields. |
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939 k = in_jvms->scloff(); |
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940 l = in_jvms->scl_size(); |
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941 out_jvms->set_scloff(p); |
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942 for (j = 0; j < l; j++) |
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943 call->set_req(p++, in_map->in(k+j)); |
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944 |
0 | 945 // Finish the new jvms. |
946 out_jvms->set_endoff(p); | |
947 | |
948 assert(out_jvms->endoff() == debug_end, "fill ptr must match"); | |
949 assert(out_jvms->depth() == in_jvms->depth(), "depth must match"); | |
950 assert(out_jvms->loc_size() == in_jvms->loc_size(), "size must match"); | |
951 assert(out_jvms->mon_size() == in_jvms->mon_size(), "size must match"); | |
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952 assert(out_jvms->scl_size() == in_jvms->scl_size(), "size must match"); |
0 | 953 assert(out_jvms->debug_size() == in_jvms->debug_size(), "size must match"); |
954 | |
955 // Update the two tail pointers in parallel. | |
956 out_jvms = out_jvms->caller(); | |
957 in_jvms = in_jvms->caller(); | |
958 } | |
959 | |
960 assert(debug_ptr == non_debug_edges, "debug info must fit exactly"); | |
961 | |
962 // Test the correctness of JVMState::debug_xxx accessors: | |
963 assert(call->jvms()->debug_start() == non_debug_edges, ""); | |
964 assert(call->jvms()->debug_end() == call->req(), ""); | |
965 assert(call->jvms()->debug_depth() == call->req() - non_debug_edges, ""); | |
966 } | |
967 | |
968 bool GraphKit::compute_stack_effects(int& inputs, int& depth) { | |
969 Bytecodes::Code code = java_bc(); | |
970 if (code == Bytecodes::_wide) { | |
971 code = method()->java_code_at_bci(bci() + 1); | |
972 } | |
973 | |
974 BasicType rtype = T_ILLEGAL; | |
975 int rsize = 0; | |
976 | |
977 if (code != Bytecodes::_illegal) { | |
978 depth = Bytecodes::depth(code); // checkcast=0, athrow=-1 | |
979 rtype = Bytecodes::result_type(code); // checkcast=P, athrow=V | |
980 if (rtype < T_CONFLICT) | |
981 rsize = type2size[rtype]; | |
982 } | |
983 | |
984 switch (code) { | |
985 case Bytecodes::_illegal: | |
986 return false; | |
987 | |
988 case Bytecodes::_ldc: | |
989 case Bytecodes::_ldc_w: | |
990 case Bytecodes::_ldc2_w: | |
991 inputs = 0; | |
992 break; | |
993 | |
994 case Bytecodes::_dup: inputs = 1; break; | |
995 case Bytecodes::_dup_x1: inputs = 2; break; | |
996 case Bytecodes::_dup_x2: inputs = 3; break; | |
997 case Bytecodes::_dup2: inputs = 2; break; | |
998 case Bytecodes::_dup2_x1: inputs = 3; break; | |
999 case Bytecodes::_dup2_x2: inputs = 4; break; | |
1000 case Bytecodes::_swap: inputs = 2; break; | |
1001 case Bytecodes::_arraylength: inputs = 1; break; | |
1002 | |
1003 case Bytecodes::_getstatic: | |
1004 case Bytecodes::_putstatic: | |
1005 case Bytecodes::_getfield: | |
1006 case Bytecodes::_putfield: | |
1007 { | |
1008 bool is_get = (depth >= 0), is_static = (depth & 1); | |
1009 bool ignore; | |
1010 ciBytecodeStream iter(method()); | |
1011 iter.reset_to_bci(bci()); | |
1012 iter.next(); | |
1013 ciField* field = iter.get_field(ignore); | |
1014 int size = field->type()->size(); | |
1015 inputs = (is_static ? 0 : 1); | |
1016 if (is_get) { | |
1017 depth = size - inputs; | |
1018 } else { | |
1019 inputs += size; // putxxx pops the value from the stack | |
1020 depth = - inputs; | |
1021 } | |
1022 } | |
1023 break; | |
1024 | |
1025 case Bytecodes::_invokevirtual: | |
1026 case Bytecodes::_invokespecial: | |
1027 case Bytecodes::_invokestatic: | |
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1028 case Bytecodes::_invokedynamic: |
0 | 1029 case Bytecodes::_invokeinterface: |
1030 { | |
1031 bool ignore; | |
1032 ciBytecodeStream iter(method()); | |
1033 iter.reset_to_bci(bci()); | |
1034 iter.next(); | |
1035 ciMethod* method = iter.get_method(ignore); | |
1036 inputs = method->arg_size_no_receiver(); | |
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1037 // Add a receiver argument, maybe: |
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1038 if (code != Bytecodes::_invokestatic && |
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1039 code != Bytecodes::_invokedynamic) |
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1040 inputs += 1; |
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1041 // (Do not use ciMethod::arg_size(), because |
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1042 // it might be an unloaded method, which doesn't |
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1043 // know whether it is static or not.) |
0 | 1044 int size = method->return_type()->size(); |
1045 depth = size - inputs; | |
1046 } | |
1047 break; | |
1048 | |
1049 case Bytecodes::_multianewarray: | |
1050 { | |
1051 ciBytecodeStream iter(method()); | |
1052 iter.reset_to_bci(bci()); | |
1053 iter.next(); | |
1054 inputs = iter.get_dimensions(); | |
1055 assert(rsize == 1, ""); | |
1056 depth = rsize - inputs; | |
1057 } | |
1058 break; | |
1059 | |
1060 case Bytecodes::_ireturn: | |
1061 case Bytecodes::_lreturn: | |
1062 case Bytecodes::_freturn: | |
1063 case Bytecodes::_dreturn: | |
1064 case Bytecodes::_areturn: | |
1065 assert(rsize = -depth, ""); | |
1066 inputs = rsize; | |
1067 break; | |
1068 | |
1069 case Bytecodes::_jsr: | |
1070 case Bytecodes::_jsr_w: | |
1071 inputs = 0; | |
1072 depth = 1; // S.B. depth=1, not zero | |
1073 break; | |
1074 | |
1075 default: | |
1076 // bytecode produces a typed result | |
1077 inputs = rsize - depth; | |
1078 assert(inputs >= 0, ""); | |
1079 break; | |
1080 } | |
1081 | |
1082 #ifdef ASSERT | |
1083 // spot check | |
1084 int outputs = depth + inputs; | |
1085 assert(outputs >= 0, "sanity"); | |
1086 switch (code) { | |
1087 case Bytecodes::_checkcast: assert(inputs == 1 && outputs == 1, ""); break; | |
1088 case Bytecodes::_athrow: assert(inputs == 1 && outputs == 0, ""); break; | |
1089 case Bytecodes::_aload_0: assert(inputs == 0 && outputs == 1, ""); break; | |
1090 case Bytecodes::_return: assert(inputs == 0 && outputs == 0, ""); break; | |
1091 case Bytecodes::_drem: assert(inputs == 4 && outputs == 2, ""); break; | |
1092 } | |
1093 #endif //ASSERT | |
1094 | |
1095 return true; | |
1096 } | |
1097 | |
1098 | |
1099 | |
1100 //------------------------------basic_plus_adr--------------------------------- | |
1101 Node* GraphKit::basic_plus_adr(Node* base, Node* ptr, Node* offset) { | |
1102 // short-circuit a common case | |
1103 if (offset == intcon(0)) return ptr; | |
1104 return _gvn.transform( new (C, 4) AddPNode(base, ptr, offset) ); | |
1105 } | |
1106 | |
1107 Node* GraphKit::ConvI2L(Node* offset) { | |
1108 // short-circuit a common case | |
1109 jint offset_con = find_int_con(offset, Type::OffsetBot); | |
1110 if (offset_con != Type::OffsetBot) { | |
1111 return longcon((long) offset_con); | |
1112 } | |
1113 return _gvn.transform( new (C, 2) ConvI2LNode(offset)); | |
1114 } | |
1115 Node* GraphKit::ConvL2I(Node* offset) { | |
1116 // short-circuit a common case | |
1117 jlong offset_con = find_long_con(offset, (jlong)Type::OffsetBot); | |
1118 if (offset_con != (jlong)Type::OffsetBot) { | |
1119 return intcon((int) offset_con); | |
1120 } | |
1121 return _gvn.transform( new (C, 2) ConvL2INode(offset)); | |
1122 } | |
1123 | |
1124 //-------------------------load_object_klass----------------------------------- | |
1125 Node* GraphKit::load_object_klass(Node* obj) { | |
1126 // Special-case a fresh allocation to avoid building nodes: | |
1127 Node* akls = AllocateNode::Ideal_klass(obj, &_gvn); | |
1128 if (akls != NULL) return akls; | |
1129 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes()); | |
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1130 return _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), k_adr, TypeInstPtr::KLASS) ); |
0 | 1131 } |
1132 | |
1133 //-------------------------load_array_length----------------------------------- | |
1134 Node* GraphKit::load_array_length(Node* array) { | |
1135 // Special-case a fresh allocation to avoid building nodes: | |
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1136 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(array, &_gvn); |
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1137 Node *alen; |
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1138 if (alloc == NULL) { |
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1139 Node *r_adr = basic_plus_adr(array, arrayOopDesc::length_offset_in_bytes()); |
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1140 alen = _gvn.transform( new (C, 3) LoadRangeNode(0, immutable_memory(), r_adr, TypeInt::POS)); |
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1141 } else { |
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1142 alen = alloc->Ideal_length(); |
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1143 Node* ccast = alloc->make_ideal_length(_gvn.type(array)->is_oopptr(), &_gvn); |
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1144 if (ccast != alen) { |
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1145 alen = _gvn.transform(ccast); |
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1146 } |
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1147 } |
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1148 return alen; |
0 | 1149 } |
1150 | |
1151 //------------------------------do_null_check---------------------------------- | |
1152 // Helper function to do a NULL pointer check. Returned value is | |
1153 // the incoming address with NULL casted away. You are allowed to use the | |
1154 // not-null value only if you are control dependent on the test. | |
1155 extern int explicit_null_checks_inserted, | |
1156 explicit_null_checks_elided; | |
1157 Node* GraphKit::null_check_common(Node* value, BasicType type, | |
1158 // optional arguments for variations: | |
1159 bool assert_null, | |
1160 Node* *null_control) { | |
1161 assert(!assert_null || null_control == NULL, "not both at once"); | |
1162 if (stopped()) return top(); | |
1163 if (!GenerateCompilerNullChecks && !assert_null && null_control == NULL) { | |
1164 // For some performance testing, we may wish to suppress null checking. | |
1165 value = cast_not_null(value); // Make it appear to be non-null (4962416). | |
1166 return value; | |
1167 } | |
1168 explicit_null_checks_inserted++; | |
1169 | |
1170 // Construct NULL check | |
1171 Node *chk = NULL; | |
1172 switch(type) { | |
1173 case T_LONG : chk = new (C, 3) CmpLNode(value, _gvn.zerocon(T_LONG)); break; | |
1174 case T_INT : chk = new (C, 3) CmpINode( value, _gvn.intcon(0)); break; | |
1175 case T_ARRAY : // fall through | |
1176 type = T_OBJECT; // simplify further tests | |
1177 case T_OBJECT : { | |
1178 const Type *t = _gvn.type( value ); | |
1179 | |
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1180 const TypeOopPtr* tp = t->isa_oopptr(); |
955 | 1181 if (tp != NULL && tp->klass() != NULL && !tp->klass()->is_loaded() |
0 | 1182 // Only for do_null_check, not any of its siblings: |
1183 && !assert_null && null_control == NULL) { | |
1184 // Usually, any field access or invocation on an unloaded oop type | |
1185 // will simply fail to link, since the statically linked class is | |
1186 // likely also to be unloaded. However, in -Xcomp mode, sometimes | |
1187 // the static class is loaded but the sharper oop type is not. | |
1188 // Rather than checking for this obscure case in lots of places, | |
1189 // we simply observe that a null check on an unloaded class | |
1190 // will always be followed by a nonsense operation, so we | |
1191 // can just issue the uncommon trap here. | |
1192 // Our access to the unloaded class will only be correct | |
1193 // after it has been loaded and initialized, which requires | |
1194 // a trip through the interpreter. | |
1195 #ifndef PRODUCT | |
1196 if (WizardMode) { tty->print("Null check of unloaded "); tp->klass()->print(); tty->cr(); } | |
1197 #endif | |
1198 uncommon_trap(Deoptimization::Reason_unloaded, | |
1199 Deoptimization::Action_reinterpret, | |
1200 tp->klass(), "!loaded"); | |
1201 return top(); | |
1202 } | |
1203 | |
1204 if (assert_null) { | |
1205 // See if the type is contained in NULL_PTR. | |
1206 // If so, then the value is already null. | |
1207 if (t->higher_equal(TypePtr::NULL_PTR)) { | |
1208 explicit_null_checks_elided++; | |
1209 return value; // Elided null assert quickly! | |
1210 } | |
1211 } else { | |
1212 // See if mixing in the NULL pointer changes type. | |
1213 // If so, then the NULL pointer was not allowed in the original | |
1214 // type. In other words, "value" was not-null. | |
1215 if (t->meet(TypePtr::NULL_PTR) != t) { | |
1216 // same as: if (!TypePtr::NULL_PTR->higher_equal(t)) ... | |
1217 explicit_null_checks_elided++; | |
1218 return value; // Elided null check quickly! | |
1219 } | |
1220 } | |
1221 chk = new (C, 3) CmpPNode( value, null() ); | |
1222 break; | |
1223 } | |
1224 | |
1225 default : ShouldNotReachHere(); | |
1226 } | |
1227 assert(chk != NULL, "sanity check"); | |
1228 chk = _gvn.transform(chk); | |
1229 | |
1230 BoolTest::mask btest = assert_null ? BoolTest::eq : BoolTest::ne; | |
1231 BoolNode *btst = new (C, 2) BoolNode( chk, btest); | |
1232 Node *tst = _gvn.transform( btst ); | |
1233 | |
1234 //----------- | |
605 | 1235 // if peephole optimizations occurred, a prior test existed. |
0 | 1236 // If a prior test existed, maybe it dominates as we can avoid this test. |
1237 if (tst != btst && type == T_OBJECT) { | |
1238 // At this point we want to scan up the CFG to see if we can | |
1239 // find an identical test (and so avoid this test altogether). | |
1240 Node *cfg = control(); | |
1241 int depth = 0; | |
1242 while( depth < 16 ) { // Limit search depth for speed | |
1243 if( cfg->Opcode() == Op_IfTrue && | |
1244 cfg->in(0)->in(1) == tst ) { | |
1245 // Found prior test. Use "cast_not_null" to construct an identical | |
1246 // CastPP (and hence hash to) as already exists for the prior test. | |
1247 // Return that casted value. | |
1248 if (assert_null) { | |
1249 replace_in_map(value, null()); | |
1250 return null(); // do not issue the redundant test | |
1251 } | |
1252 Node *oldcontrol = control(); | |
1253 set_control(cfg); | |
1254 Node *res = cast_not_null(value); | |
1255 set_control(oldcontrol); | |
1256 explicit_null_checks_elided++; | |
1257 return res; | |
1258 } | |
1259 cfg = IfNode::up_one_dom(cfg, /*linear_only=*/ true); | |
1260 if (cfg == NULL) break; // Quit at region nodes | |
1261 depth++; | |
1262 } | |
1263 } | |
1264 | |
1265 //----------- | |
1266 // Branch to failure if null | |
1267 float ok_prob = PROB_MAX; // a priori estimate: nulls never happen | |
1268 Deoptimization::DeoptReason reason; | |
1269 if (assert_null) | |
1270 reason = Deoptimization::Reason_null_assert; | |
1271 else if (type == T_OBJECT) | |
1272 reason = Deoptimization::Reason_null_check; | |
1273 else | |
1274 reason = Deoptimization::Reason_div0_check; | |
1275 | |
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1276 // %%% Since Reason_unhandled is not recorded on a per-bytecode basis, |
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1277 // ciMethodData::has_trap_at will return a conservative -1 if any |
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1278 // must-be-null assertion has failed. This could cause performance |
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1279 // problems for a method after its first do_null_assert failure. |
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1280 // Consider using 'Reason_class_check' instead? |
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1281 |
0 | 1282 // To cause an implicit null check, we set the not-null probability |
605 | 1283 // to the maximum (PROB_MAX). For an explicit check the probability |
0 | 1284 // is set to a smaller value. |
1285 if (null_control != NULL || too_many_traps(reason)) { | |
1286 // probability is less likely | |
1287 ok_prob = PROB_LIKELY_MAG(3); | |
1288 } else if (!assert_null && | |
1289 (ImplicitNullCheckThreshold > 0) && | |
1290 method() != NULL && | |
1291 (method()->method_data()->trap_count(reason) | |
1292 >= (uint)ImplicitNullCheckThreshold)) { | |
1293 ok_prob = PROB_LIKELY_MAG(3); | |
1294 } | |
1295 | |
1296 if (null_control != NULL) { | |
1297 IfNode* iff = create_and_map_if(control(), tst, ok_prob, COUNT_UNKNOWN); | |
1298 Node* null_true = _gvn.transform( new (C, 1) IfFalseNode(iff)); | |
1299 set_control( _gvn.transform( new (C, 1) IfTrueNode(iff))); | |
1300 if (null_true == top()) | |
1301 explicit_null_checks_elided++; | |
1302 (*null_control) = null_true; | |
1303 } else { | |
1304 BuildCutout unless(this, tst, ok_prob); | |
1305 // Check for optimizer eliding test at parse time | |
1306 if (stopped()) { | |
1307 // Failure not possible; do not bother making uncommon trap. | |
1308 explicit_null_checks_elided++; | |
1309 } else if (assert_null) { | |
1310 uncommon_trap(reason, | |
1311 Deoptimization::Action_make_not_entrant, | |
1312 NULL, "assert_null"); | |
1313 } else { | |
332 | 1314 replace_in_map(value, zerocon(type)); |
0 | 1315 builtin_throw(reason); |
1316 } | |
1317 } | |
1318 | |
1319 // Must throw exception, fall-thru not possible? | |
1320 if (stopped()) { | |
1321 return top(); // No result | |
1322 } | |
1323 | |
1324 if (assert_null) { | |
1325 // Cast obj to null on this path. | |
1326 replace_in_map(value, zerocon(type)); | |
1327 return zerocon(type); | |
1328 } | |
1329 | |
1330 // Cast obj to not-null on this path, if there is no null_control. | |
1331 // (If there is a null_control, a non-null value may come back to haunt us.) | |
1332 if (type == T_OBJECT) { | |
1333 Node* cast = cast_not_null(value, false); | |
1334 if (null_control == NULL || (*null_control) == top()) | |
1335 replace_in_map(value, cast); | |
1336 value = cast; | |
1337 } | |
1338 | |
1339 return value; | |
1340 } | |
1341 | |
1342 | |
1343 //------------------------------cast_not_null---------------------------------- | |
1344 // Cast obj to not-null on this path | |
1345 Node* GraphKit::cast_not_null(Node* obj, bool do_replace_in_map) { | |
1346 const Type *t = _gvn.type(obj); | |
1347 const Type *t_not_null = t->join(TypePtr::NOTNULL); | |
1348 // Object is already not-null? | |
1349 if( t == t_not_null ) return obj; | |
1350 | |
1351 Node *cast = new (C, 2) CastPPNode(obj,t_not_null); | |
1352 cast->init_req(0, control()); | |
1353 cast = _gvn.transform( cast ); | |
1354 | |
1355 // Scan for instances of 'obj' in the current JVM mapping. | |
1356 // These instances are known to be not-null after the test. | |
1357 if (do_replace_in_map) | |
1358 replace_in_map(obj, cast); | |
1359 | |
1360 return cast; // Return casted value | |
1361 } | |
1362 | |
1363 | |
1364 //--------------------------replace_in_map------------------------------------- | |
1365 void GraphKit::replace_in_map(Node* old, Node* neww) { | |
1366 this->map()->replace_edge(old, neww); | |
1367 | |
1368 // Note: This operation potentially replaces any edge | |
1369 // on the map. This includes locals, stack, and monitors | |
1370 // of the current (innermost) JVM state. | |
1371 | |
1372 // We can consider replacing in caller maps. | |
1373 // The idea would be that an inlined function's null checks | |
1374 // can be shared with the entire inlining tree. | |
1375 // The expense of doing this is that the PreserveJVMState class | |
1376 // would have to preserve caller states too, with a deep copy. | |
1377 } | |
1378 | |
1379 | |
1380 | |
1381 //============================================================================= | |
1382 //--------------------------------memory--------------------------------------- | |
1383 Node* GraphKit::memory(uint alias_idx) { | |
1384 MergeMemNode* mem = merged_memory(); | |
1385 Node* p = mem->memory_at(alias_idx); | |
1386 _gvn.set_type(p, Type::MEMORY); // must be mapped | |
1387 return p; | |
1388 } | |
1389 | |
1390 //-----------------------------reset_memory------------------------------------ | |
1391 Node* GraphKit::reset_memory() { | |
1392 Node* mem = map()->memory(); | |
1393 // do not use this node for any more parsing! | |
1394 debug_only( map()->set_memory((Node*)NULL) ); | |
1395 return _gvn.transform( mem ); | |
1396 } | |
1397 | |
1398 //------------------------------set_all_memory--------------------------------- | |
1399 void GraphKit::set_all_memory(Node* newmem) { | |
1400 Node* mergemem = MergeMemNode::make(C, newmem); | |
1401 gvn().set_type_bottom(mergemem); | |
1402 map()->set_memory(mergemem); | |
1403 } | |
1404 | |
1405 //------------------------------set_all_memory_call---------------------------- | |
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1406 void GraphKit::set_all_memory_call(Node* call, bool separate_io_proj) { |
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1407 Node* newmem = _gvn.transform( new (C, 1) ProjNode(call, TypeFunc::Memory, separate_io_proj) ); |
0 | 1408 set_all_memory(newmem); |
1409 } | |
1410 | |
1411 //============================================================================= | |
1412 // | |
1413 // parser factory methods for MemNodes | |
1414 // | |
1415 // These are layered on top of the factory methods in LoadNode and StoreNode, | |
1416 // and integrate with the parser's memory state and _gvn engine. | |
1417 // | |
1418 | |
1419 // factory methods in "int adr_idx" | |
1420 Node* GraphKit::make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, | |
1421 int adr_idx, | |
1422 bool require_atomic_access) { | |
1423 assert(adr_idx != Compile::AliasIdxTop, "use other make_load factory" ); | |
1424 const TypePtr* adr_type = NULL; // debug-mode-only argument | |
1425 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
1426 Node* mem = memory(adr_idx); | |
1427 Node* ld; | |
1428 if (require_atomic_access && bt == T_LONG) { | |
1429 ld = LoadLNode::make_atomic(C, ctl, mem, adr, adr_type, t); | |
1430 } else { | |
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1431 ld = LoadNode::make(_gvn, ctl, mem, adr, adr_type, t, bt); |
0 | 1432 } |
1433 return _gvn.transform(ld); | |
1434 } | |
1435 | |
1436 Node* GraphKit::store_to_memory(Node* ctl, Node* adr, Node *val, BasicType bt, | |
1437 int adr_idx, | |
1438 bool require_atomic_access) { | |
1439 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); | |
1440 const TypePtr* adr_type = NULL; | |
1441 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
1442 Node *mem = memory(adr_idx); | |
1443 Node* st; | |
1444 if (require_atomic_access && bt == T_LONG) { | |
1445 st = StoreLNode::make_atomic(C, ctl, mem, adr, adr_type, val); | |
1446 } else { | |
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1447 st = StoreNode::make(_gvn, ctl, mem, adr, adr_type, val, bt); |
0 | 1448 } |
1449 st = _gvn.transform(st); | |
1450 set_memory(st, adr_idx); | |
1451 // Back-to-back stores can only remove intermediate store with DU info | |
1452 // so push on worklist for optimizer. | |
1453 if (mem->req() > MemNode::Address && adr == mem->in(MemNode::Address)) | |
1454 record_for_igvn(st); | |
1455 | |
1456 return st; | |
1457 } | |
1458 | |
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1459 |
0 | 1460 void GraphKit::pre_barrier(Node* ctl, |
1461 Node* obj, | |
1462 Node* adr, | |
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1463 uint adr_idx, |
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1464 Node* val, |
825 | 1465 const TypeOopPtr* val_type, |
0 | 1466 BasicType bt) { |
1467 BarrierSet* bs = Universe::heap()->barrier_set(); | |
1468 set_control(ctl); | |
1469 switch (bs->kind()) { | |
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1470 case BarrierSet::G1SATBCT: |
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1471 case BarrierSet::G1SATBCTLogging: |
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1472 g1_write_barrier_pre(obj, adr, adr_idx, val, val_type, bt); |
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1473 break; |
0 | 1474 |
1475 case BarrierSet::CardTableModRef: | |
1476 case BarrierSet::CardTableExtension: | |
1477 case BarrierSet::ModRef: | |
1478 break; | |
1479 | |
1480 case BarrierSet::Other: | |
1481 default : | |
1482 ShouldNotReachHere(); | |
1483 | |
1484 } | |
1485 } | |
1486 | |
1487 void GraphKit::post_barrier(Node* ctl, | |
1488 Node* store, | |
1489 Node* obj, | |
1490 Node* adr, | |
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1491 uint adr_idx, |
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1492 Node* val, |
0 | 1493 BasicType bt, |
1494 bool use_precise) { | |
1495 BarrierSet* bs = Universe::heap()->barrier_set(); | |
1496 set_control(ctl); | |
1497 switch (bs->kind()) { | |
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1498 case BarrierSet::G1SATBCT: |
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1499 case BarrierSet::G1SATBCTLogging: |
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1500 g1_write_barrier_post(store, obj, adr, adr_idx, val, bt, use_precise); |
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1501 break; |
0 | 1502 |
1503 case BarrierSet::CardTableModRef: | |
1504 case BarrierSet::CardTableExtension: | |
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1505 write_barrier_post(store, obj, adr, adr_idx, val, use_precise); |
0 | 1506 break; |
1507 | |
1508 case BarrierSet::ModRef: | |
1509 break; | |
1510 | |
1511 case BarrierSet::Other: | |
1512 default : | |
1513 ShouldNotReachHere(); | |
1514 | |
1515 } | |
1516 } | |
1517 | |
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1518 Node* GraphKit::store_oop(Node* ctl, |
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1519 Node* obj, |
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1520 Node* adr, |
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1521 const TypePtr* adr_type, |
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1522 Node* val, |
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1523 const TypeOopPtr* val_type, |
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1524 BasicType bt, |
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1525 bool use_precise) { |
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1526 |
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1527 set_control(ctl); |
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1528 if (stopped()) return top(); // Dead path ? |
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1529 |
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1530 assert(bt == T_OBJECT, "sanity"); |
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1531 assert(val != NULL, "not dead path"); |
0 | 1532 uint adr_idx = C->get_alias_index(adr_type); |
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1533 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); |
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1534 |
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1535 pre_barrier(control(), obj, adr, adr_idx, val, val_type, bt); |
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1536 Node* store = store_to_memory(control(), adr, val, bt, adr_idx); |
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1537 post_barrier(control(), store, obj, adr, adr_idx, val, bt, use_precise); |
0 | 1538 return store; |
1539 } | |
1540 | |
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1541 // Could be an array or object we don't know at compile time (unsafe ref.) |
0 | 1542 Node* GraphKit::store_oop_to_unknown(Node* ctl, |
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1543 Node* obj, // containing obj |
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1544 Node* adr, // actual adress to store val at |
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1545 const TypePtr* adr_type, |
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1546 Node* val, |
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1547 BasicType bt) { |
825 | 1548 Compile::AliasType* at = C->alias_type(adr_type); |
1549 const TypeOopPtr* val_type = NULL; | |
1550 if (adr_type->isa_instptr()) { | |
1551 if (at->field() != NULL) { | |
1552 // known field. This code is a copy of the do_put_xxx logic. | |
1553 ciField* field = at->field(); | |
1554 if (!field->type()->is_loaded()) { | |
1555 val_type = TypeInstPtr::BOTTOM; | |
1556 } else { | |
1557 val_type = TypeOopPtr::make_from_klass(field->type()->as_klass()); | |
1558 } | |
1559 } | |
1560 } else if (adr_type->isa_aryptr()) { | |
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1561 val_type = adr_type->is_aryptr()->elem()->make_oopptr(); |
825 | 1562 } |
1563 if (val_type == NULL) { | |
1564 val_type = TypeInstPtr::BOTTOM; | |
1565 } | |
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1566 return store_oop(ctl, obj, adr, adr_type, val, val_type, bt, true); |
0 | 1567 } |
1568 | |
1569 | |
1570 //-------------------------array_element_address------------------------- | |
1571 Node* GraphKit::array_element_address(Node* ary, Node* idx, BasicType elembt, | |
1572 const TypeInt* sizetype) { | |
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1573 uint shift = exact_log2(type2aelembytes(elembt)); |
0 | 1574 uint header = arrayOopDesc::base_offset_in_bytes(elembt); |
1575 | |
1576 // short-circuit a common case (saves lots of confusing waste motion) | |
1577 jint idx_con = find_int_con(idx, -1); | |
1578 if (idx_con >= 0) { | |
1579 intptr_t offset = header + ((intptr_t)idx_con << shift); | |
1580 return basic_plus_adr(ary, offset); | |
1581 } | |
1582 | |
1583 // must be correct type for alignment purposes | |
1584 Node* base = basic_plus_adr(ary, header); | |
1585 #ifdef _LP64 | |
1586 // The scaled index operand to AddP must be a clean 64-bit value. | |
1587 // Java allows a 32-bit int to be incremented to a negative | |
1588 // value, which appears in a 64-bit register as a large | |
1589 // positive number. Using that large positive number as an | |
1590 // operand in pointer arithmetic has bad consequences. | |
1591 // On the other hand, 32-bit overflow is rare, and the possibility | |
1592 // can often be excluded, if we annotate the ConvI2L node with | |
1593 // a type assertion that its value is known to be a small positive | |
1594 // number. (The prior range check has ensured this.) | |
1595 // This assertion is used by ConvI2LNode::Ideal. | |
1596 int index_max = max_jint - 1; // array size is max_jint, index is one less | |
1597 if (sizetype != NULL) index_max = sizetype->_hi - 1; | |
1598 const TypeLong* lidxtype = TypeLong::make(CONST64(0), index_max, Type::WidenMax); | |
1599 idx = _gvn.transform( new (C, 2) ConvI2LNode(idx, lidxtype) ); | |
1600 #endif | |
1601 Node* scale = _gvn.transform( new (C, 3) LShiftXNode(idx, intcon(shift)) ); | |
1602 return basic_plus_adr(ary, base, scale); | |
1603 } | |
1604 | |
1605 //-------------------------load_array_element------------------------- | |
1606 Node* GraphKit::load_array_element(Node* ctl, Node* ary, Node* idx, const TypeAryPtr* arytype) { | |
1607 const Type* elemtype = arytype->elem(); | |
1608 BasicType elembt = elemtype->array_element_basic_type(); | |
1609 Node* adr = array_element_address(ary, idx, elembt, arytype->size()); | |
1610 Node* ld = make_load(ctl, adr, elemtype, elembt, arytype); | |
1611 return ld; | |
1612 } | |
1613 | |
1614 //-------------------------set_arguments_for_java_call------------------------- | |
1615 // Arguments (pre-popped from the stack) are taken from the JVMS. | |
1616 void GraphKit::set_arguments_for_java_call(CallJavaNode* call) { | |
1617 // Add the call arguments: | |
1618 uint nargs = call->method()->arg_size(); | |
1619 for (uint i = 0; i < nargs; i++) { | |
1620 Node* arg = argument(i); | |
1621 call->init_req(i + TypeFunc::Parms, arg); | |
1622 } | |
1623 } | |
1624 | |
1625 //---------------------------set_edges_for_java_call--------------------------- | |
1626 // Connect a newly created call into the current JVMS. | |
1627 // A return value node (if any) is returned from set_edges_for_java_call. | |
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1628 void GraphKit::set_edges_for_java_call(CallJavaNode* call, bool must_throw, bool separate_io_proj) { |
0 | 1629 |
1630 // Add the predefined inputs: | |
1631 call->init_req( TypeFunc::Control, control() ); | |
1632 call->init_req( TypeFunc::I_O , i_o() ); | |
1633 call->init_req( TypeFunc::Memory , reset_memory() ); | |
1634 call->init_req( TypeFunc::FramePtr, frameptr() ); | |
1635 call->init_req( TypeFunc::ReturnAdr, top() ); | |
1636 | |
1637 add_safepoint_edges(call, must_throw); | |
1638 | |
1639 Node* xcall = _gvn.transform(call); | |
1640 | |
1641 if (xcall == top()) { | |
1642 set_control(top()); | |
1643 return; | |
1644 } | |
1645 assert(xcall == call, "call identity is stable"); | |
1646 | |
1647 // Re-use the current map to produce the result. | |
1648 | |
1649 set_control(_gvn.transform(new (C, 1) ProjNode(call, TypeFunc::Control))); | |
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1650 set_i_o( _gvn.transform(new (C, 1) ProjNode(call, TypeFunc::I_O , separate_io_proj))); |
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1651 set_all_memory_call(xcall, separate_io_proj); |
0 | 1652 |
1653 //return xcall; // no need, caller already has it | |
1654 } | |
1655 | |
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1656 Node* GraphKit::set_results_for_java_call(CallJavaNode* call, bool separate_io_proj) { |
0 | 1657 if (stopped()) return top(); // maybe the call folded up? |
1658 | |
1659 // Capture the return value, if any. | |
1660 Node* ret; | |
1661 if (call->method() == NULL || | |
1662 call->method()->return_type()->basic_type() == T_VOID) | |
1663 ret = top(); | |
1664 else ret = _gvn.transform(new (C, 1) ProjNode(call, TypeFunc::Parms)); | |
1665 | |
1666 // Note: Since any out-of-line call can produce an exception, | |
1667 // we always insert an I_O projection from the call into the result. | |
1668 | |
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1669 make_slow_call_ex(call, env()->Throwable_klass(), separate_io_proj); |
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1670 |
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1671 if (separate_io_proj) { |
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1672 // The caller requested separate projections be used by the fall |
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1673 // through and exceptional paths, so replace the projections for |
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1674 // the fall through path. |
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1675 set_i_o(_gvn.transform( new (C, 1) ProjNode(call, TypeFunc::I_O) )); |
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1676 set_all_memory(_gvn.transform( new (C, 1) ProjNode(call, TypeFunc::Memory) )); |
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1677 } |
0 | 1678 return ret; |
1679 } | |
1680 | |
1681 //--------------------set_predefined_input_for_runtime_call-------------------- | |
1682 // Reading and setting the memory state is way conservative here. | |
1683 // The real problem is that I am not doing real Type analysis on memory, | |
1684 // so I cannot distinguish card mark stores from other stores. Across a GC | |
1685 // point the Store Barrier and the card mark memory has to agree. I cannot | |
1686 // have a card mark store and its barrier split across the GC point from | |
1687 // either above or below. Here I get that to happen by reading ALL of memory. | |
1688 // A better answer would be to separate out card marks from other memory. | |
1689 // For now, return the input memory state, so that it can be reused | |
1690 // after the call, if this call has restricted memory effects. | |
1691 Node* GraphKit::set_predefined_input_for_runtime_call(SafePointNode* call) { | |
1692 // Set fixed predefined input arguments | |
1693 Node* memory = reset_memory(); | |
1694 call->init_req( TypeFunc::Control, control() ); | |
1695 call->init_req( TypeFunc::I_O, top() ); // does no i/o | |
1696 call->init_req( TypeFunc::Memory, memory ); // may gc ptrs | |
1697 call->init_req( TypeFunc::FramePtr, frameptr() ); | |
1698 call->init_req( TypeFunc::ReturnAdr, top() ); | |
1699 return memory; | |
1700 } | |
1701 | |
1702 //-------------------set_predefined_output_for_runtime_call-------------------- | |
1703 // Set control and memory (not i_o) from the call. | |
1704 // If keep_mem is not NULL, use it for the output state, | |
1705 // except for the RawPtr output of the call, if hook_mem is TypeRawPtr::BOTTOM. | |
1706 // If hook_mem is NULL, this call produces no memory effects at all. | |
1707 // If hook_mem is a Java-visible memory slice (such as arraycopy operands), | |
1708 // then only that memory slice is taken from the call. | |
1709 // In the last case, we must put an appropriate memory barrier before | |
1710 // the call, so as to create the correct anti-dependencies on loads | |
1711 // preceding the call. | |
1712 void GraphKit::set_predefined_output_for_runtime_call(Node* call, | |
1713 Node* keep_mem, | |
1714 const TypePtr* hook_mem) { | |
1715 // no i/o | |
1716 set_control(_gvn.transform( new (C, 1) ProjNode(call,TypeFunc::Control) )); | |
1717 if (keep_mem) { | |
1718 // First clone the existing memory state | |
1719 set_all_memory(keep_mem); | |
1720 if (hook_mem != NULL) { | |
1721 // Make memory for the call | |
1722 Node* mem = _gvn.transform( new (C, 1) ProjNode(call, TypeFunc::Memory) ); | |
1723 // Set the RawPtr memory state only. This covers all the heap top/GC stuff | |
1724 // We also use hook_mem to extract specific effects from arraycopy stubs. | |
1725 set_memory(mem, hook_mem); | |
1726 } | |
1727 // ...else the call has NO memory effects. | |
1728 | |
1729 // Make sure the call advertises its memory effects precisely. | |
1730 // This lets us build accurate anti-dependences in gcm.cpp. | |
1731 assert(C->alias_type(call->adr_type()) == C->alias_type(hook_mem), | |
1732 "call node must be constructed correctly"); | |
1733 } else { | |
1734 assert(hook_mem == NULL, ""); | |
1735 // This is not a "slow path" call; all memory comes from the call. | |
1736 set_all_memory_call(call); | |
1737 } | |
1738 } | |
1739 | |
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1740 |
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1741 // Replace the call with the current state of the kit. |
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1742 void GraphKit::replace_call(CallNode* call, Node* result) { |
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1743 JVMState* ejvms = NULL; |
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1744 if (has_exceptions()) { |
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1745 ejvms = transfer_exceptions_into_jvms(); |
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1746 } |
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1747 |
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1748 SafePointNode* final_state = stop(); |
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1749 |
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1750 // Find all the needed outputs of this call |
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1751 CallProjections callprojs; |
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1752 call->extract_projections(&callprojs, true); |
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1753 |
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1754 // Replace all the old call edges with the edges from the inlining result |
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1755 C->gvn_replace_by(callprojs.fallthrough_catchproj, final_state->in(TypeFunc::Control)); |
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1756 C->gvn_replace_by(callprojs.fallthrough_memproj, final_state->in(TypeFunc::Memory)); |
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1757 C->gvn_replace_by(callprojs.fallthrough_ioproj, final_state->in(TypeFunc::I_O)); |
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1758 Node* final_mem = final_state->in(TypeFunc::Memory); |
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1759 |
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1760 // Replace the result with the new result if it exists and is used |
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1761 if (callprojs.resproj != NULL && result != NULL) { |
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1762 C->gvn_replace_by(callprojs.resproj, result); |
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1763 } |
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1764 |
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1765 if (ejvms == NULL) { |
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1766 // No exception edges to simply kill off those paths |
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1767 C->gvn_replace_by(callprojs.catchall_catchproj, C->top()); |
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1768 C->gvn_replace_by(callprojs.catchall_memproj, C->top()); |
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1769 C->gvn_replace_by(callprojs.catchall_ioproj, C->top()); |
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1770 |
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1771 // Replace the old exception object with top |
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1772 if (callprojs.exobj != NULL) { |
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1773 C->gvn_replace_by(callprojs.exobj, C->top()); |
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1774 } |
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1775 } else { |
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1776 GraphKit ekit(ejvms); |
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1777 |
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1778 // Load my combined exception state into the kit, with all phis transformed: |
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1779 SafePointNode* ex_map = ekit.combine_and_pop_all_exception_states(); |
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1780 |
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1781 Node* ex_oop = ekit.use_exception_state(ex_map); |
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1782 |
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1783 C->gvn_replace_by(callprojs.catchall_catchproj, ekit.control()); |
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1784 C->gvn_replace_by(callprojs.catchall_memproj, ekit.reset_memory()); |
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1785 C->gvn_replace_by(callprojs.catchall_ioproj, ekit.i_o()); |
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1786 |
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1787 // Replace the old exception object with the newly created one |
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1788 if (callprojs.exobj != NULL) { |
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1789 C->gvn_replace_by(callprojs.exobj, ex_oop); |
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1790 } |
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1791 } |
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1792 |
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1793 // Disconnect the call from the graph |
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1794 call->disconnect_inputs(NULL); |
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1795 C->gvn_replace_by(call, C->top()); |
1786
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1796 |
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1797 // Clean up any MergeMems that feed other MergeMems since the |
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1798 // optimizer doesn't like that. |
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1799 if (final_mem->is_MergeMem()) { |
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1800 Node_List wl; |
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1801 for (SimpleDUIterator i(final_mem); i.has_next(); i.next()) { |
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1802 Node* m = i.get(); |
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1803 if (m->is_MergeMem() && !wl.contains(m)) { |
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1804 wl.push(m); |
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1805 } |
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1806 } |
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1807 while (wl.size() > 0) { |
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1808 _gvn.transform(wl.pop()); |
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1809 } |
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1810 } |
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1811 } |
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1812 |
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1813 |
0 | 1814 //------------------------------increment_counter------------------------------ |
1815 // for statistics: increment a VM counter by 1 | |
1816 | |
1817 void GraphKit::increment_counter(address counter_addr) { | |
1818 Node* adr1 = makecon(TypeRawPtr::make(counter_addr)); | |
1819 increment_counter(adr1); | |
1820 } | |
1821 | |
1822 void GraphKit::increment_counter(Node* counter_addr) { | |
1823 int adr_type = Compile::AliasIdxRaw; | |
1609 | 1824 Node* ctrl = control(); |
1825 Node* cnt = make_load(ctrl, counter_addr, TypeInt::INT, T_INT, adr_type); | |
0 | 1826 Node* incr = _gvn.transform(new (C, 3) AddINode(cnt, _gvn.intcon(1))); |
1609 | 1827 store_to_memory( ctrl, counter_addr, incr, T_INT, adr_type ); |
0 | 1828 } |
1829 | |
1830 | |
1831 //------------------------------uncommon_trap---------------------------------- | |
1832 // Bail out to the interpreter in mid-method. Implemented by calling the | |
1833 // uncommon_trap blob. This helper function inserts a runtime call with the | |
1834 // right debug info. | |
1835 void GraphKit::uncommon_trap(int trap_request, | |
1836 ciKlass* klass, const char* comment, | |
1837 bool must_throw, | |
1838 bool keep_exact_action) { | |
1839 if (failing()) stop(); | |
1840 if (stopped()) return; // trap reachable? | |
1841 | |
1842 // Note: If ProfileTraps is true, and if a deopt. actually | |
1843 // occurs here, the runtime will make sure an MDO exists. There is | |
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1844 // no need to call method()->ensure_method_data() at this point. |
0 | 1845 |
1846 #ifdef ASSERT | |
1847 if (!must_throw) { | |
1848 // Make sure the stack has at least enough depth to execute | |
1849 // the current bytecode. | |
1850 int inputs, ignore; | |
1851 if (compute_stack_effects(inputs, ignore)) { | |
1852 assert(sp() >= inputs, "must have enough JVMS stack to execute"); | |
1853 // It is a frequent error in library_call.cpp to issue an | |
1854 // uncommon trap with the _sp value already popped. | |
1855 } | |
1856 } | |
1857 #endif | |
1858 | |
1859 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request); | |
1860 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request); | |
1861 | |
1862 switch (action) { | |
1863 case Deoptimization::Action_maybe_recompile: | |
1864 case Deoptimization::Action_reinterpret: | |
1865 // Temporary fix for 6529811 to allow virtual calls to be sure they | |
1866 // get the chance to go from mono->bi->mega | |
1867 if (!keep_exact_action && | |
1868 Deoptimization::trap_request_index(trap_request) < 0 && | |
1869 too_many_recompiles(reason)) { | |
1870 // This BCI is causing too many recompilations. | |
1871 action = Deoptimization::Action_none; | |
1872 trap_request = Deoptimization::make_trap_request(reason, action); | |
1873 } else { | |
1874 C->set_trap_can_recompile(true); | |
1875 } | |
1876 break; | |
1877 case Deoptimization::Action_make_not_entrant: | |
1878 C->set_trap_can_recompile(true); | |
1879 break; | |
1880 #ifdef ASSERT | |
1881 case Deoptimization::Action_none: | |
1882 case Deoptimization::Action_make_not_compilable: | |
1883 break; | |
1884 default: | |
1885 assert(false, "bad action"); | |
1886 #endif | |
1887 } | |
1888 | |
1889 if (TraceOptoParse) { | |
1890 char buf[100]; | |
1891 tty->print_cr("Uncommon trap %s at bci:%d", | |
1892 Deoptimization::format_trap_request(buf, sizeof(buf), | |
1893 trap_request), bci()); | |
1894 } | |
1895 | |
1896 CompileLog* log = C->log(); | |
1897 if (log != NULL) { | |
1898 int kid = (klass == NULL)? -1: log->identify(klass); | |
1899 log->begin_elem("uncommon_trap bci='%d'", bci()); | |
1900 char buf[100]; | |
1901 log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf), | |
1902 trap_request)); | |
1903 if (kid >= 0) log->print(" klass='%d'", kid); | |
1904 if (comment != NULL) log->print(" comment='%s'", comment); | |
1905 log->end_elem(); | |
1906 } | |
1907 | |
1908 // Make sure any guarding test views this path as very unlikely | |
1909 Node *i0 = control()->in(0); | |
1910 if (i0 != NULL && i0->is_If()) { // Found a guarding if test? | |
1911 IfNode *iff = i0->as_If(); | |
1912 float f = iff->_prob; // Get prob | |
1913 if (control()->Opcode() == Op_IfTrue) { | |
1914 if (f > PROB_UNLIKELY_MAG(4)) | |
1915 iff->_prob = PROB_MIN; | |
1916 } else { | |
1917 if (f < PROB_LIKELY_MAG(4)) | |
1918 iff->_prob = PROB_MAX; | |
1919 } | |
1920 } | |
1921 | |
1922 // Clear out dead values from the debug info. | |
1923 kill_dead_locals(); | |
1924 | |
1925 // Now insert the uncommon trap subroutine call | |
1748 | 1926 address call_addr = SharedRuntime::uncommon_trap_blob()->entry_point(); |
0 | 1927 const TypePtr* no_memory_effects = NULL; |
1928 // Pass the index of the class to be loaded | |
1929 Node* call = make_runtime_call(RC_NO_LEAF | RC_UNCOMMON | | |
1930 (must_throw ? RC_MUST_THROW : 0), | |
1931 OptoRuntime::uncommon_trap_Type(), | |
1932 call_addr, "uncommon_trap", no_memory_effects, | |
1933 intcon(trap_request)); | |
1934 assert(call->as_CallStaticJava()->uncommon_trap_request() == trap_request, | |
1935 "must extract request correctly from the graph"); | |
1936 assert(trap_request != 0, "zero value reserved by uncommon_trap_request"); | |
1937 | |
1938 call->set_req(TypeFunc::ReturnAdr, returnadr()); | |
1939 // The debug info is the only real input to this call. | |
1940 | |
1941 // Halt-and-catch fire here. The above call should never return! | |
1942 HaltNode* halt = new(C, TypeFunc::Parms) HaltNode(control(), frameptr()); | |
1943 _gvn.set_type_bottom(halt); | |
1944 root()->add_req(halt); | |
1945 | |
1946 stop_and_kill_map(); | |
1947 } | |
1948 | |
1949 | |
1950 //--------------------------just_allocated_object------------------------------ | |
1951 // Report the object that was just allocated. | |
1952 // It must be the case that there are no intervening safepoints. | |
1953 // We use this to determine if an object is so "fresh" that | |
1954 // it does not require card marks. | |
1955 Node* GraphKit::just_allocated_object(Node* current_control) { | |
1956 if (C->recent_alloc_ctl() == current_control) | |
1957 return C->recent_alloc_obj(); | |
1958 return NULL; | |
1959 } | |
1960 | |
1961 | |
1962 void GraphKit::round_double_arguments(ciMethod* dest_method) { | |
1963 // (Note: TypeFunc::make has a cache that makes this fast.) | |
1964 const TypeFunc* tf = TypeFunc::make(dest_method); | |
1965 int nargs = tf->_domain->_cnt - TypeFunc::Parms; | |
1966 for (int j = 0; j < nargs; j++) { | |
1967 const Type *targ = tf->_domain->field_at(j + TypeFunc::Parms); | |
1968 if( targ->basic_type() == T_DOUBLE ) { | |
1969 // If any parameters are doubles, they must be rounded before | |
1970 // the call, dstore_rounding does gvn.transform | |
1971 Node *arg = argument(j); | |
1972 arg = dstore_rounding(arg); | |
1973 set_argument(j, arg); | |
1974 } | |
1975 } | |
1976 } | |
1977 | |
1978 void GraphKit::round_double_result(ciMethod* dest_method) { | |
1979 // A non-strict method may return a double value which has an extended | |
1980 // exponent, but this must not be visible in a caller which is 'strict' | |
1981 // If a strict caller invokes a non-strict callee, round a double result | |
1982 | |
1983 BasicType result_type = dest_method->return_type()->basic_type(); | |
1984 assert( method() != NULL, "must have caller context"); | |
1985 if( result_type == T_DOUBLE && method()->is_strict() && !dest_method->is_strict() ) { | |
1986 // Destination method's return value is on top of stack | |
1987 // dstore_rounding() does gvn.transform | |
1988 Node *result = pop_pair(); | |
1989 result = dstore_rounding(result); | |
1990 push_pair(result); | |
1991 } | |
1992 } | |
1993 | |
1994 // rounding for strict float precision conformance | |
1995 Node* GraphKit::precision_rounding(Node* n) { | |
1996 return UseStrictFP && _method->flags().is_strict() | |
1997 && UseSSE == 0 && Matcher::strict_fp_requires_explicit_rounding | |
1998 ? _gvn.transform( new (C, 2) RoundFloatNode(0, n) ) | |
1999 : n; | |
2000 } | |
2001 | |
2002 // rounding for strict double precision conformance | |
2003 Node* GraphKit::dprecision_rounding(Node *n) { | |
2004 return UseStrictFP && _method->flags().is_strict() | |
2005 && UseSSE <= 1 && Matcher::strict_fp_requires_explicit_rounding | |
2006 ? _gvn.transform( new (C, 2) RoundDoubleNode(0, n) ) | |
2007 : n; | |
2008 } | |
2009 | |
2010 // rounding for non-strict double stores | |
2011 Node* GraphKit::dstore_rounding(Node* n) { | |
2012 return Matcher::strict_fp_requires_explicit_rounding | |
2013 && UseSSE <= 1 | |
2014 ? _gvn.transform( new (C, 2) RoundDoubleNode(0, n) ) | |
2015 : n; | |
2016 } | |
2017 | |
2018 //============================================================================= | |
2019 // Generate a fast path/slow path idiom. Graph looks like: | |
2020 // [foo] indicates that 'foo' is a parameter | |
2021 // | |
2022 // [in] NULL | |
2023 // \ / | |
2024 // CmpP | |
2025 // Bool ne | |
2026 // If | |
2027 // / \ | |
2028 // True False-<2> | |
2029 // / | | |
2030 // / cast_not_null | |
2031 // Load | | ^ | |
2032 // [fast_test] | | | |
2033 // gvn to opt_test | | | |
2034 // / \ | <1> | |
2035 // True False | | |
2036 // | \\ | | |
2037 // [slow_call] \[fast_result] | |
2038 // Ctl Val \ \ | |
2039 // | \ \ | |
2040 // Catch <1> \ \ | |
2041 // / \ ^ \ \ | |
2042 // Ex No_Ex | \ \ | |
2043 // | \ \ | \ <2> \ | |
2044 // ... \ [slow_res] | | \ [null_result] | |
2045 // \ \--+--+--- | | | |
2046 // \ | / \ | / | |
2047 // --------Region Phi | |
2048 // | |
2049 //============================================================================= | |
2050 // Code is structured as a series of driver functions all called 'do_XXX' that | |
2051 // call a set of helper functions. Helper functions first, then drivers. | |
2052 | |
2053 //------------------------------null_check_oop--------------------------------- | |
2054 // Null check oop. Set null-path control into Region in slot 3. | |
2055 // Make a cast-not-nullness use the other not-null control. Return cast. | |
2056 Node* GraphKit::null_check_oop(Node* value, Node* *null_control, | |
2057 bool never_see_null) { | |
2058 // Initial NULL check taken path | |
2059 (*null_control) = top(); | |
2060 Node* cast = null_check_common(value, T_OBJECT, false, null_control); | |
2061 | |
2062 // Generate uncommon_trap: | |
2063 if (never_see_null && (*null_control) != top()) { | |
2064 // If we see an unexpected null at a check-cast we record it and force a | |
2065 // recompile; the offending check-cast will be compiled to handle NULLs. | |
2066 // If we see more than one offending BCI, then all checkcasts in the | |
2067 // method will be compiled to handle NULLs. | |
2068 PreserveJVMState pjvms(this); | |
2069 set_control(*null_control); | |
332 | 2070 replace_in_map(value, null()); |
0 | 2071 uncommon_trap(Deoptimization::Reason_null_check, |
2072 Deoptimization::Action_make_not_entrant); | |
2073 (*null_control) = top(); // NULL path is dead | |
2074 } | |
2075 | |
2076 // Cast away null-ness on the result | |
2077 return cast; | |
2078 } | |
2079 | |
2080 //------------------------------opt_iff---------------------------------------- | |
2081 // Optimize the fast-check IfNode. Set the fast-path region slot 2. | |
2082 // Return slow-path control. | |
2083 Node* GraphKit::opt_iff(Node* region, Node* iff) { | |
2084 IfNode *opt_iff = _gvn.transform(iff)->as_If(); | |
2085 | |
2086 // Fast path taken; set region slot 2 | |
2087 Node *fast_taken = _gvn.transform( new (C, 1) IfFalseNode(opt_iff) ); | |
2088 region->init_req(2,fast_taken); // Capture fast-control | |
2089 | |
2090 // Fast path not-taken, i.e. slow path | |
2091 Node *slow_taken = _gvn.transform( new (C, 1) IfTrueNode(opt_iff) ); | |
2092 return slow_taken; | |
2093 } | |
2094 | |
2095 //-----------------------------make_runtime_call------------------------------- | |
2096 Node* GraphKit::make_runtime_call(int flags, | |
2097 const TypeFunc* call_type, address call_addr, | |
2098 const char* call_name, | |
2099 const TypePtr* adr_type, | |
2100 // The following parms are all optional. | |
2101 // The first NULL ends the list. | |
2102 Node* parm0, Node* parm1, | |
2103 Node* parm2, Node* parm3, | |
2104 Node* parm4, Node* parm5, | |
2105 Node* parm6, Node* parm7) { | |
2106 // Slow-path call | |
2107 int size = call_type->domain()->cnt(); | |
2108 bool is_leaf = !(flags & RC_NO_LEAF); | |
2109 bool has_io = (!is_leaf && !(flags & RC_NO_IO)); | |
2110 if (call_name == NULL) { | |
2111 assert(!is_leaf, "must supply name for leaf"); | |
2112 call_name = OptoRuntime::stub_name(call_addr); | |
2113 } | |
2114 CallNode* call; | |
2115 if (!is_leaf) { | |
2116 call = new(C, size) CallStaticJavaNode(call_type, call_addr, call_name, | |
2117 bci(), adr_type); | |
2118 } else if (flags & RC_NO_FP) { | |
2119 call = new(C, size) CallLeafNoFPNode(call_type, call_addr, call_name, adr_type); | |
2120 } else { | |
2121 call = new(C, size) CallLeafNode(call_type, call_addr, call_name, adr_type); | |
2122 } | |
2123 | |
2124 // The following is similar to set_edges_for_java_call, | |
2125 // except that the memory effects of the call are restricted to AliasIdxRaw. | |
2126 | |
2127 // Slow path call has no side-effects, uses few values | |
2128 bool wide_in = !(flags & RC_NARROW_MEM); | |
2129 bool wide_out = (C->get_alias_index(adr_type) == Compile::AliasIdxBot); | |
2130 | |
2131 Node* prev_mem = NULL; | |
2132 if (wide_in) { | |
2133 prev_mem = set_predefined_input_for_runtime_call(call); | |
2134 } else { | |
2135 assert(!wide_out, "narrow in => narrow out"); | |
2136 Node* narrow_mem = memory(adr_type); | |
2137 prev_mem = reset_memory(); | |
2138 map()->set_memory(narrow_mem); | |
2139 set_predefined_input_for_runtime_call(call); | |
2140 } | |
2141 | |
2142 // Hook each parm in order. Stop looking at the first NULL. | |
2143 if (parm0 != NULL) { call->init_req(TypeFunc::Parms+0, parm0); | |
2144 if (parm1 != NULL) { call->init_req(TypeFunc::Parms+1, parm1); | |
2145 if (parm2 != NULL) { call->init_req(TypeFunc::Parms+2, parm2); | |
2146 if (parm3 != NULL) { call->init_req(TypeFunc::Parms+3, parm3); | |
2147 if (parm4 != NULL) { call->init_req(TypeFunc::Parms+4, parm4); | |
2148 if (parm5 != NULL) { call->init_req(TypeFunc::Parms+5, parm5); | |
2149 if (parm6 != NULL) { call->init_req(TypeFunc::Parms+6, parm6); | |
2150 if (parm7 != NULL) { call->init_req(TypeFunc::Parms+7, parm7); | |
2151 /* close each nested if ===> */ } } } } } } } } | |
2152 assert(call->in(call->req()-1) != NULL, "must initialize all parms"); | |
2153 | |
2154 if (!is_leaf) { | |
2155 // Non-leaves can block and take safepoints: | |
2156 add_safepoint_edges(call, ((flags & RC_MUST_THROW) != 0)); | |
2157 } | |
2158 // Non-leaves can throw exceptions: | |
2159 if (has_io) { | |
2160 call->set_req(TypeFunc::I_O, i_o()); | |
2161 } | |
2162 | |
2163 if (flags & RC_UNCOMMON) { | |
2164 // Set the count to a tiny probability. Cf. Estimate_Block_Frequency. | |
2165 // (An "if" probability corresponds roughly to an unconditional count. | |
2166 // Sort of.) | |
2167 call->set_cnt(PROB_UNLIKELY_MAG(4)); | |
2168 } | |
2169 | |
2170 Node* c = _gvn.transform(call); | |
2171 assert(c == call, "cannot disappear"); | |
2172 | |
2173 if (wide_out) { | |
2174 // Slow path call has full side-effects. | |
2175 set_predefined_output_for_runtime_call(call); | |
2176 } else { | |
2177 // Slow path call has few side-effects, and/or sets few values. | |
2178 set_predefined_output_for_runtime_call(call, prev_mem, adr_type); | |
2179 } | |
2180 | |
2181 if (has_io) { | |
2182 set_i_o(_gvn.transform(new (C, 1) ProjNode(call, TypeFunc::I_O))); | |
2183 } | |
2184 return call; | |
2185 | |
2186 } | |
2187 | |
2188 //------------------------------merge_memory----------------------------------- | |
2189 // Merge memory from one path into the current memory state. | |
2190 void GraphKit::merge_memory(Node* new_mem, Node* region, int new_path) { | |
2191 for (MergeMemStream mms(merged_memory(), new_mem->as_MergeMem()); mms.next_non_empty2(); ) { | |
2192 Node* old_slice = mms.force_memory(); | |
2193 Node* new_slice = mms.memory2(); | |
2194 if (old_slice != new_slice) { | |
2195 PhiNode* phi; | |
2196 if (new_slice->is_Phi() && new_slice->as_Phi()->region() == region) { | |
2197 phi = new_slice->as_Phi(); | |
2198 #ifdef ASSERT | |
2199 if (old_slice->is_Phi() && old_slice->as_Phi()->region() == region) | |
2200 old_slice = old_slice->in(new_path); | |
2201 // Caller is responsible for ensuring that any pre-existing | |
2202 // phis are already aware of old memory. | |
2203 int old_path = (new_path > 1) ? 1 : 2; // choose old_path != new_path | |
2204 assert(phi->in(old_path) == old_slice, "pre-existing phis OK"); | |
2205 #endif | |
2206 mms.set_memory(phi); | |
2207 } else { | |
2208 phi = PhiNode::make(region, old_slice, Type::MEMORY, mms.adr_type(C)); | |
2209 _gvn.set_type(phi, Type::MEMORY); | |
2210 phi->set_req(new_path, new_slice); | |
2211 mms.set_memory(_gvn.transform(phi)); // assume it is complete | |
2212 } | |
2213 } | |
2214 } | |
2215 } | |
2216 | |
2217 //------------------------------make_slow_call_ex------------------------------ | |
2218 // Make the exception handler hookups for the slow call | |
2219 void GraphKit::make_slow_call_ex(Node* call, ciInstanceKlass* ex_klass, bool separate_io_proj) { | |
2220 if (stopped()) return; | |
2221 | |
2222 // Make a catch node with just two handlers: fall-through and catch-all | |
2223 Node* i_o = _gvn.transform( new (C, 1) ProjNode(call, TypeFunc::I_O, separate_io_proj) ); | |
2224 Node* catc = _gvn.transform( new (C, 2) CatchNode(control(), i_o, 2) ); | |
2225 Node* norm = _gvn.transform( new (C, 1) CatchProjNode(catc, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci) ); | |
2226 Node* excp = _gvn.transform( new (C, 1) CatchProjNode(catc, CatchProjNode::catch_all_index, CatchProjNode::no_handler_bci) ); | |
2227 | |
2228 { PreserveJVMState pjvms(this); | |
2229 set_control(excp); | |
2230 set_i_o(i_o); | |
2231 | |
2232 if (excp != top()) { | |
2233 // Create an exception state also. | |
2234 // Use an exact type if the caller has specified a specific exception. | |
2235 const Type* ex_type = TypeOopPtr::make_from_klass_unique(ex_klass)->cast_to_ptr_type(TypePtr::NotNull); | |
2236 Node* ex_oop = new (C, 2) CreateExNode(ex_type, control(), i_o); | |
2237 add_exception_state(make_exception_state(_gvn.transform(ex_oop))); | |
2238 } | |
2239 } | |
2240 | |
2241 // Get the no-exception control from the CatchNode. | |
2242 set_control(norm); | |
2243 } | |
2244 | |
2245 | |
2246 //-------------------------------gen_subtype_check----------------------------- | |
2247 // Generate a subtyping check. Takes as input the subtype and supertype. | |
2248 // Returns 2 values: sets the default control() to the true path and returns | |
2249 // the false path. Only reads invariant memory; sets no (visible) memory. | |
2250 // The PartialSubtypeCheckNode sets the hidden 1-word cache in the encoding | |
2251 // but that's not exposed to the optimizer. This call also doesn't take in an | |
2252 // Object; if you wish to check an Object you need to load the Object's class | |
2253 // prior to coming here. | |
2254 Node* GraphKit::gen_subtype_check(Node* subklass, Node* superklass) { | |
2255 // Fast check for identical types, perhaps identical constants. | |
2256 // The types can even be identical non-constants, in cases | |
2257 // involving Array.newInstance, Object.clone, etc. | |
2258 if (subklass == superklass) | |
2259 return top(); // false path is dead; no test needed. | |
2260 | |
2261 if (_gvn.type(superklass)->singleton()) { | |
2262 ciKlass* superk = _gvn.type(superklass)->is_klassptr()->klass(); | |
2263 ciKlass* subk = _gvn.type(subklass)->is_klassptr()->klass(); | |
2264 | |
2265 // In the common case of an exact superklass, try to fold up the | |
2266 // test before generating code. You may ask, why not just generate | |
2267 // the code and then let it fold up? The answer is that the generated | |
2268 // code will necessarily include null checks, which do not always | |
2269 // completely fold away. If they are also needless, then they turn | |
2270 // into a performance loss. Example: | |
2271 // Foo[] fa = blah(); Foo x = fa[0]; fa[1] = x; | |
2272 // Here, the type of 'fa' is often exact, so the store check | |
2273 // of fa[1]=x will fold up, without testing the nullness of x. | |
2274 switch (static_subtype_check(superk, subk)) { | |
2275 case SSC_always_false: | |
2276 { | |
2277 Node* always_fail = control(); | |
2278 set_control(top()); | |
2279 return always_fail; | |
2280 } | |
2281 case SSC_always_true: | |
2282 return top(); | |
2283 case SSC_easy_test: | |
2284 { | |
2285 // Just do a direct pointer compare and be done. | |
2286 Node* cmp = _gvn.transform( new(C, 3) CmpPNode(subklass, superklass) ); | |
2287 Node* bol = _gvn.transform( new(C, 2) BoolNode(cmp, BoolTest::eq) ); | |
2288 IfNode* iff = create_and_xform_if(control(), bol, PROB_STATIC_FREQUENT, COUNT_UNKNOWN); | |
2289 set_control( _gvn.transform( new(C, 1) IfTrueNode (iff) ) ); | |
2290 return _gvn.transform( new(C, 1) IfFalseNode(iff) ); | |
2291 } | |
2292 case SSC_full_test: | |
2293 break; | |
2294 default: | |
2295 ShouldNotReachHere(); | |
2296 } | |
2297 } | |
2298 | |
2299 // %%% Possible further optimization: Even if the superklass is not exact, | |
2300 // if the subklass is the unique subtype of the superklass, the check | |
2301 // will always succeed. We could leave a dependency behind to ensure this. | |
2302 | |
2303 // First load the super-klass's check-offset | |
2304 Node *p1 = basic_plus_adr( superklass, superklass, sizeof(oopDesc) + Klass::super_check_offset_offset_in_bytes() ); | |
2305 Node *chk_off = _gvn.transform( new (C, 3) LoadINode( NULL, memory(p1), p1, _gvn.type(p1)->is_ptr() ) ); | |
2306 int cacheoff_con = sizeof(oopDesc) + Klass::secondary_super_cache_offset_in_bytes(); | |
2307 bool might_be_cache = (find_int_con(chk_off, cacheoff_con) == cacheoff_con); | |
2308 | |
2309 // Load from the sub-klass's super-class display list, or a 1-word cache of | |
2310 // the secondary superclass list, or a failing value with a sentinel offset | |
2311 // if the super-klass is an interface or exceptionally deep in the Java | |
2312 // hierarchy and we have to scan the secondary superclass list the hard way. | |
2313 // Worst-case type is a little odd: NULL is allowed as a result (usually | |
2314 // klass loads can never produce a NULL). | |
2315 Node *chk_off_X = ConvI2X(chk_off); | |
2316 Node *p2 = _gvn.transform( new (C, 4) AddPNode(subklass,subklass,chk_off_X) ); | |
2317 // For some types like interfaces the following loadKlass is from a 1-word | |
2318 // cache which is mutable so can't use immutable memory. Other | |
2319 // types load from the super-class display table which is immutable. | |
2320 Node *kmem = might_be_cache ? memory(p2) : immutable_memory(); | |
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2321 Node *nkls = _gvn.transform( LoadKlassNode::make( _gvn, kmem, p2, _gvn.type(p2)->is_ptr(), TypeKlassPtr::OBJECT_OR_NULL ) ); |
0 | 2322 |
2323 // Compile speed common case: ARE a subtype and we canNOT fail | |
2324 if( superklass == nkls ) | |
2325 return top(); // false path is dead; no test needed. | |
2326 | |
2327 // See if we get an immediate positive hit. Happens roughly 83% of the | |
2328 // time. Test to see if the value loaded just previously from the subklass | |
2329 // is exactly the superklass. | |
2330 Node *cmp1 = _gvn.transform( new (C, 3) CmpPNode( superklass, nkls ) ); | |
2331 Node *bol1 = _gvn.transform( new (C, 2) BoolNode( cmp1, BoolTest::eq ) ); | |
2332 IfNode *iff1 = create_and_xform_if( control(), bol1, PROB_LIKELY(0.83f), COUNT_UNKNOWN ); | |
2333 Node *iftrue1 = _gvn.transform( new (C, 1) IfTrueNode ( iff1 ) ); | |
2334 set_control( _gvn.transform( new (C, 1) IfFalseNode( iff1 ) ) ); | |
2335 | |
2336 // Compile speed common case: Check for being deterministic right now. If | |
2337 // chk_off is a constant and not equal to cacheoff then we are NOT a | |
2338 // subklass. In this case we need exactly the 1 test above and we can | |
2339 // return those results immediately. | |
2340 if (!might_be_cache) { | |
2341 Node* not_subtype_ctrl = control(); | |
2342 set_control(iftrue1); // We need exactly the 1 test above | |
2343 return not_subtype_ctrl; | |
2344 } | |
2345 | |
2346 // Gather the various success & failures here | |
2347 RegionNode *r_ok_subtype = new (C, 4) RegionNode(4); | |
2348 record_for_igvn(r_ok_subtype); | |
2349 RegionNode *r_not_subtype = new (C, 3) RegionNode(3); | |
2350 record_for_igvn(r_not_subtype); | |
2351 | |
2352 r_ok_subtype->init_req(1, iftrue1); | |
2353 | |
2354 // Check for immediate negative hit. Happens roughly 11% of the time (which | |
2355 // is roughly 63% of the remaining cases). Test to see if the loaded | |
2356 // check-offset points into the subklass display list or the 1-element | |
2357 // cache. If it points to the display (and NOT the cache) and the display | |
2358 // missed then it's not a subtype. | |
2359 Node *cacheoff = _gvn.intcon(cacheoff_con); | |
2360 Node *cmp2 = _gvn.transform( new (C, 3) CmpINode( chk_off, cacheoff ) ); | |
2361 Node *bol2 = _gvn.transform( new (C, 2) BoolNode( cmp2, BoolTest::ne ) ); | |
2362 IfNode *iff2 = create_and_xform_if( control(), bol2, PROB_LIKELY(0.63f), COUNT_UNKNOWN ); | |
2363 r_not_subtype->init_req(1, _gvn.transform( new (C, 1) IfTrueNode (iff2) ) ); | |
2364 set_control( _gvn.transform( new (C, 1) IfFalseNode(iff2) ) ); | |
2365 | |
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2366 // Check for self. Very rare to get here, but it is taken 1/3 the time. |
0 | 2367 // No performance impact (too rare) but allows sharing of secondary arrays |
2368 // which has some footprint reduction. | |
2369 Node *cmp3 = _gvn.transform( new (C, 3) CmpPNode( subklass, superklass ) ); | |
2370 Node *bol3 = _gvn.transform( new (C, 2) BoolNode( cmp3, BoolTest::eq ) ); | |
2371 IfNode *iff3 = create_and_xform_if( control(), bol3, PROB_LIKELY(0.36f), COUNT_UNKNOWN ); | |
2372 r_ok_subtype->init_req(2, _gvn.transform( new (C, 1) IfTrueNode ( iff3 ) ) ); | |
2373 set_control( _gvn.transform( new (C, 1) IfFalseNode( iff3 ) ) ); | |
2374 | |
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2375 // -- Roads not taken here: -- |
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2376 // We could also have chosen to perform the self-check at the beginning |
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2377 // of this code sequence, as the assembler does. This would not pay off |
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2378 // the same way, since the optimizer, unlike the assembler, can perform |
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2379 // static type analysis to fold away many successful self-checks. |
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2380 // Non-foldable self checks work better here in second position, because |
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2381 // the initial primary superclass check subsumes a self-check for most |
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2382 // types. An exception would be a secondary type like array-of-interface, |
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2383 // which does not appear in its own primary supertype display. |
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2384 // Finally, we could have chosen to move the self-check into the |
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2385 // PartialSubtypeCheckNode, and from there out-of-line in a platform |
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2386 // dependent manner. But it is worthwhile to have the check here, |
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2387 // where it can be perhaps be optimized. The cost in code space is |
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2388 // small (register compare, branch). |
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2389 |
0 | 2390 // Now do a linear scan of the secondary super-klass array. Again, no real |
2391 // performance impact (too rare) but it's gotta be done. | |
2392 // Since the code is rarely used, there is no penalty for moving it | |
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2393 // out of line, and it can only improve I-cache density. |
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2394 // The decision to inline or out-of-line this final check is platform |
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2395 // dependent, and is found in the AD file definition of PartialSubtypeCheck. |
0 | 2396 Node* psc = _gvn.transform( |
2397 new (C, 3) PartialSubtypeCheckNode(control(), subklass, superklass) ); | |
2398 | |
2399 Node *cmp4 = _gvn.transform( new (C, 3) CmpPNode( psc, null() ) ); | |
2400 Node *bol4 = _gvn.transform( new (C, 2) BoolNode( cmp4, BoolTest::ne ) ); | |
2401 IfNode *iff4 = create_and_xform_if( control(), bol4, PROB_FAIR, COUNT_UNKNOWN ); | |
2402 r_not_subtype->init_req(2, _gvn.transform( new (C, 1) IfTrueNode (iff4) ) ); | |
2403 r_ok_subtype ->init_req(3, _gvn.transform( new (C, 1) IfFalseNode(iff4) ) ); | |
2404 | |
2405 // Return false path; set default control to true path. | |
2406 set_control( _gvn.transform(r_ok_subtype) ); | |
2407 return _gvn.transform(r_not_subtype); | |
2408 } | |
2409 | |
2410 //----------------------------static_subtype_check----------------------------- | |
2411 // Shortcut important common cases when superklass is exact: | |
2412 // (0) superklass is java.lang.Object (can occur in reflective code) | |
2413 // (1) subklass is already limited to a subtype of superklass => always ok | |
2414 // (2) subklass does not overlap with superklass => always fail | |
2415 // (3) superklass has NO subtypes and we can check with a simple compare. | |
2416 int GraphKit::static_subtype_check(ciKlass* superk, ciKlass* subk) { | |
2417 if (StressReflectiveCode) { | |
2418 return SSC_full_test; // Let caller generate the general case. | |
2419 } | |
2420 | |
2421 if (superk == env()->Object_klass()) { | |
2422 return SSC_always_true; // (0) this test cannot fail | |
2423 } | |
2424 | |
2425 ciType* superelem = superk; | |
2426 if (superelem->is_array_klass()) | |
2427 superelem = superelem->as_array_klass()->base_element_type(); | |
2428 | |
2429 if (!subk->is_interface()) { // cannot trust static interface types yet | |
2430 if (subk->is_subtype_of(superk)) { | |
2431 return SSC_always_true; // (1) false path dead; no dynamic test needed | |
2432 } | |
2433 if (!(superelem->is_klass() && superelem->as_klass()->is_interface()) && | |
2434 !superk->is_subtype_of(subk)) { | |
2435 return SSC_always_false; | |
2436 } | |
2437 } | |
2438 | |
2439 // If casting to an instance klass, it must have no subtypes | |
2440 if (superk->is_interface()) { | |
2441 // Cannot trust interfaces yet. | |
2442 // %%% S.B. superk->nof_implementors() == 1 | |
2443 } else if (superelem->is_instance_klass()) { | |
2444 ciInstanceKlass* ik = superelem->as_instance_klass(); | |
2445 if (!ik->has_subklass() && !ik->is_interface()) { | |
2446 if (!ik->is_final()) { | |
2447 // Add a dependency if there is a chance of a later subclass. | |
2448 C->dependencies()->assert_leaf_type(ik); | |
2449 } | |
2450 return SSC_easy_test; // (3) caller can do a simple ptr comparison | |
2451 } | |
2452 } else { | |
2453 // A primitive array type has no subtypes. | |
2454 return SSC_easy_test; // (3) caller can do a simple ptr comparison | |
2455 } | |
2456 | |
2457 return SSC_full_test; | |
2458 } | |
2459 | |
2460 // Profile-driven exact type check: | |
2461 Node* GraphKit::type_check_receiver(Node* receiver, ciKlass* klass, | |
2462 float prob, | |
2463 Node* *casted_receiver) { | |
2464 const TypeKlassPtr* tklass = TypeKlassPtr::make(klass); | |
2465 Node* recv_klass = load_object_klass(receiver); | |
2466 Node* want_klass = makecon(tklass); | |
2467 Node* cmp = _gvn.transform( new(C, 3) CmpPNode(recv_klass, want_klass) ); | |
2468 Node* bol = _gvn.transform( new(C, 2) BoolNode(cmp, BoolTest::eq) ); | |
2469 IfNode* iff = create_and_xform_if(control(), bol, prob, COUNT_UNKNOWN); | |
2470 set_control( _gvn.transform( new(C, 1) IfTrueNode (iff) )); | |
2471 Node* fail = _gvn.transform( new(C, 1) IfFalseNode(iff) ); | |
2472 | |
2473 const TypeOopPtr* recv_xtype = tklass->as_instance_type(); | |
2474 assert(recv_xtype->klass_is_exact(), ""); | |
2475 | |
2476 // Subsume downstream occurrences of receiver with a cast to | |
2477 // recv_xtype, since now we know what the type will be. | |
2478 Node* cast = new(C, 2) CheckCastPPNode(control(), receiver, recv_xtype); | |
2479 (*casted_receiver) = _gvn.transform(cast); | |
2480 // (User must make the replace_in_map call.) | |
2481 | |
2482 return fail; | |
2483 } | |
2484 | |
2485 | |
1746
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2486 //------------------------------seems_never_null------------------------------- |
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2487 // Use null_seen information if it is available from the profile. |
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2488 // If we see an unexpected null at a type check we record it and force a |
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2489 // recompile; the offending check will be recompiled to handle NULLs. |
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2490 // If we see several offending BCIs, then all checks in the |
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2491 // method will be recompiled. |
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2492 bool GraphKit::seems_never_null(Node* obj, ciProfileData* data) { |
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2493 if (UncommonNullCast // Cutout for this technique |
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2494 && obj != null() // And not the -Xcomp stupid case? |
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2495 && !too_many_traps(Deoptimization::Reason_null_check) |
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2496 ) { |
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2497 if (data == NULL) |
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2498 // Edge case: no mature data. Be optimistic here. |
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2499 return true; |
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2500 // If the profile has not seen a null, assume it won't happen. |
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2501 assert(java_bc() == Bytecodes::_checkcast || |
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2502 java_bc() == Bytecodes::_instanceof || |
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2503 java_bc() == Bytecodes::_aastore, "MDO must collect null_seen bit here"); |
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2504 return !data->as_BitData()->null_seen(); |
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2505 } |
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2506 return false; |
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2507 } |
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2508 |
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2509 //------------------------maybe_cast_profiled_receiver------------------------- |
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2510 // If the profile has seen exactly one type, narrow to exactly that type. |
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2511 // Subsequent type checks will always fold up. |
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2512 Node* GraphKit::maybe_cast_profiled_receiver(Node* not_null_obj, |
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2513 ciProfileData* data, |
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2514 ciKlass* require_klass) { |
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2515 if (!UseTypeProfile || !TypeProfileCasts) return NULL; |
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2516 if (data == NULL) return NULL; |
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2517 |
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2518 // Make sure we haven't already deoptimized from this tactic. |
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2519 if (too_many_traps(Deoptimization::Reason_class_check)) |
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2520 return NULL; |
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2521 |
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2522 // (No, this isn't a call, but it's enough like a virtual call |
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2523 // to use the same ciMethod accessor to get the profile info...) |
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2524 ciCallProfile profile = method()->call_profile_at_bci(bci()); |
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2525 if (profile.count() >= 0 && // no cast failures here |
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2526 profile.has_receiver(0) && |
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2527 profile.morphism() == 1) { |
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2528 ciKlass* exact_kls = profile.receiver(0); |
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2529 if (require_klass == NULL || |
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2530 static_subtype_check(require_klass, exact_kls) == SSC_always_true) { |
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2531 // If we narrow the type to match what the type profile sees, |
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2532 // we can then remove the rest of the cast. |
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2533 // This is a win, even if the exact_kls is very specific, |
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2534 // because downstream operations, such as method calls, |
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2535 // will often benefit from the sharper type. |
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2536 Node* exact_obj = not_null_obj; // will get updated in place... |
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2537 Node* slow_ctl = type_check_receiver(exact_obj, exact_kls, 1.0, |
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2538 &exact_obj); |
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2539 { PreserveJVMState pjvms(this); |
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2540 set_control(slow_ctl); |
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2541 uncommon_trap(Deoptimization::Reason_class_check, |
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2542 Deoptimization::Action_maybe_recompile); |
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2543 } |
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2544 replace_in_map(not_null_obj, exact_obj); |
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2545 return exact_obj; |
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2546 } |
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2547 // assert(ssc == SSC_always_true)... except maybe the profile lied to us. |
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2548 } |
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2549 |
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2550 return NULL; |
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2551 } |
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2552 |
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2553 |
0 | 2554 //-------------------------------gen_instanceof-------------------------------- |
2555 // Generate an instance-of idiom. Used by both the instance-of bytecode | |
2556 // and the reflective instance-of call. | |
1746
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2557 Node* GraphKit::gen_instanceof(Node* obj, Node* superklass) { |
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2558 kill_dead_locals(); // Benefit all the uncommon traps |
0 | 2559 assert( !stopped(), "dead parse path should be checked in callers" ); |
2560 assert(!TypePtr::NULL_PTR->higher_equal(_gvn.type(superklass)->is_klassptr()), | |
2561 "must check for not-null not-dead klass in callers"); | |
2562 | |
2563 // Make the merge point | |
2564 enum { _obj_path = 1, _fail_path, _null_path, PATH_LIMIT }; | |
2565 RegionNode* region = new(C, PATH_LIMIT) RegionNode(PATH_LIMIT); | |
2566 Node* phi = new(C, PATH_LIMIT) PhiNode(region, TypeInt::BOOL); | |
2567 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
2568 | |
1746
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2569 ciProfileData* data = NULL; |
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2570 if (java_bc() == Bytecodes::_instanceof) { // Only for the bytecode |
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2571 data = method()->method_data()->bci_to_data(bci()); |
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2572 } |
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2573 bool never_see_null = (ProfileDynamicTypes // aggressive use of profile |
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2574 && seems_never_null(obj, data)); |
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2575 |
0 | 2576 // Null check; get casted pointer; set region slot 3 |
2577 Node* null_ctl = top(); | |
1746
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2578 Node* not_null_obj = null_check_oop(obj, &null_ctl, never_see_null); |
0 | 2579 |
2580 // If not_null_obj is dead, only null-path is taken | |
2581 if (stopped()) { // Doing instance-of on a NULL? | |
2582 set_control(null_ctl); | |
2583 return intcon(0); | |
2584 } | |
2585 region->init_req(_null_path, null_ctl); | |
2586 phi ->init_req(_null_path, intcon(0)); // Set null path value | |
1746
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2587 if (null_ctl == top()) { |
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2588 // Do this eagerly, so that pattern matches like is_diamond_phi |
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2589 // will work even during parsing. |
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2590 assert(_null_path == PATH_LIMIT-1, "delete last"); |
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2591 region->del_req(_null_path); |
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2592 phi ->del_req(_null_path); |
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2593 } |
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2594 |
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2595 if (ProfileDynamicTypes && data != NULL) { |
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2596 Node* cast_obj = maybe_cast_profiled_receiver(not_null_obj, data, NULL); |
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2597 if (stopped()) { // Profile disagrees with this path. |
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2598 set_control(null_ctl); // Null is the only remaining possibility. |
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2599 return intcon(0); |
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2600 } |
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2601 if (cast_obj != NULL) |
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2602 not_null_obj = cast_obj; |
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2603 } |
0 | 2604 |
2605 // Load the object's klass | |
2606 Node* obj_klass = load_object_klass(not_null_obj); | |
2607 | |
2608 // Generate the subtype check | |
2609 Node* not_subtype_ctrl = gen_subtype_check(obj_klass, superklass); | |
2610 | |
2611 // Plug in the success path to the general merge in slot 1. | |
2612 region->init_req(_obj_path, control()); | |
2613 phi ->init_req(_obj_path, intcon(1)); | |
2614 | |
2615 // Plug in the failing path to the general merge in slot 2. | |
2616 region->init_req(_fail_path, not_subtype_ctrl); | |
2617 phi ->init_req(_fail_path, intcon(0)); | |
2618 | |
2619 // Return final merged results | |
2620 set_control( _gvn.transform(region) ); | |
2621 record_for_igvn(region); | |
2622 return _gvn.transform(phi); | |
2623 } | |
2624 | |
2625 //-------------------------------gen_checkcast--------------------------------- | |
2626 // Generate a checkcast idiom. Used by both the checkcast bytecode and the | |
2627 // array store bytecode. Stack must be as-if BEFORE doing the bytecode so the | |
2628 // uncommon-trap paths work. Adjust stack after this call. | |
2629 // If failure_control is supplied and not null, it is filled in with | |
2630 // the control edge for the cast failure. Otherwise, an appropriate | |
2631 // uncommon trap or exception is thrown. | |
2632 Node* GraphKit::gen_checkcast(Node *obj, Node* superklass, | |
2633 Node* *failure_control) { | |
2634 kill_dead_locals(); // Benefit all the uncommon traps | |
2635 const TypeKlassPtr *tk = _gvn.type(superklass)->is_klassptr(); | |
2636 const Type *toop = TypeOopPtr::make_from_klass(tk->klass()); | |
2637 | |
2638 // Fast cutout: Check the case that the cast is vacuously true. | |
2639 // This detects the common cases where the test will short-circuit | |
2640 // away completely. We do this before we perform the null check, | |
2641 // because if the test is going to turn into zero code, we don't | |
2642 // want a residual null check left around. (Causes a slowdown, | |
2643 // for example, in some objArray manipulations, such as a[i]=a[j].) | |
2644 if (tk->singleton()) { | |
2645 const TypeOopPtr* objtp = _gvn.type(obj)->isa_oopptr(); | |
2646 if (objtp != NULL && objtp->klass() != NULL) { | |
2647 switch (static_subtype_check(tk->klass(), objtp->klass())) { | |
2648 case SSC_always_true: | |
2649 return obj; | |
2650 case SSC_always_false: | |
2651 // It needs a null check because a null will *pass* the cast check. | |
2652 // A non-null value will always produce an exception. | |
2653 return do_null_assert(obj, T_OBJECT); | |
2654 } | |
2655 } | |
2656 } | |
2657 | |
2658 ciProfileData* data = NULL; | |
2659 if (failure_control == NULL) { // use MDO in regular case only | |
2660 assert(java_bc() == Bytecodes::_aastore || | |
2661 java_bc() == Bytecodes::_checkcast, | |
2662 "interpreter profiles type checks only for these BCs"); | |
2663 data = method()->method_data()->bci_to_data(bci()); | |
2664 } | |
2665 | |
2666 // Make the merge point | |
2667 enum { _obj_path = 1, _null_path, PATH_LIMIT }; | |
2668 RegionNode* region = new (C, PATH_LIMIT) RegionNode(PATH_LIMIT); | |
2669 Node* phi = new (C, PATH_LIMIT) PhiNode(region, toop); | |
2670 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
2671 | |
2672 // Use null-cast information if it is available | |
1746
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2673 bool never_see_null = ((failure_control == NULL) // regular case only |
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2674 && seems_never_null(obj, data)); |
0 | 2675 |
2676 // Null check; get casted pointer; set region slot 3 | |
2677 Node* null_ctl = top(); | |
2678 Node* not_null_obj = null_check_oop(obj, &null_ctl, never_see_null); | |
2679 | |
2680 // If not_null_obj is dead, only null-path is taken | |
2681 if (stopped()) { // Doing instance-of on a NULL? | |
2682 set_control(null_ctl); | |
2683 return null(); | |
2684 } | |
2685 region->init_req(_null_path, null_ctl); | |
2686 phi ->init_req(_null_path, null()); // Set null path value | |
1746
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2687 if (null_ctl == top()) { |
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2688 // Do this eagerly, so that pattern matches like is_diamond_phi |
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2689 // will work even during parsing. |
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2690 assert(_null_path == PATH_LIMIT-1, "delete last"); |
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2691 region->del_req(_null_path); |
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2692 phi ->del_req(_null_path); |
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2693 } |
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2694 |
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2695 Node* cast_obj = NULL; |
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2696 if (data != NULL && |
0 | 2697 // Counter has never been decremented (due to cast failure). |
2698 // ...This is a reasonable thing to expect. It is true of | |
2699 // all casts inserted by javac to implement generic types. | |
1746
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2700 data->as_CounterData()->count() >= 0) { |
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2701 cast_obj = maybe_cast_profiled_receiver(not_null_obj, data, tk->klass()); |
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2702 if (cast_obj != NULL) { |
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2703 if (failure_control != NULL) // failure is now impossible |
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2704 (*failure_control) = top(); |
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2705 // adjust the type of the phi to the exact klass: |
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2706 phi->raise_bottom_type(_gvn.type(cast_obj)->meet(TypePtr::NULL_PTR)); |
0 | 2707 } |
2708 } | |
2709 | |
2710 if (cast_obj == NULL) { | |
2711 // Load the object's klass | |
2712 Node* obj_klass = load_object_klass(not_null_obj); | |
2713 | |
2714 // Generate the subtype check | |
2715 Node* not_subtype_ctrl = gen_subtype_check( obj_klass, superklass ); | |
2716 | |
2717 // Plug in success path into the merge | |
2718 cast_obj = _gvn.transform(new (C, 2) CheckCastPPNode(control(), | |
2719 not_null_obj, toop)); | |
2720 // Failure path ends in uncommon trap (or may be dead - failure impossible) | |
2721 if (failure_control == NULL) { | |
2722 if (not_subtype_ctrl != top()) { // If failure is possible | |
2723 PreserveJVMState pjvms(this); | |
2724 set_control(not_subtype_ctrl); | |
2725 builtin_throw(Deoptimization::Reason_class_check, obj_klass); | |
2726 } | |
2727 } else { | |
2728 (*failure_control) = not_subtype_ctrl; | |
2729 } | |
2730 } | |
2731 | |
2732 region->init_req(_obj_path, control()); | |
2733 phi ->init_req(_obj_path, cast_obj); | |
2734 | |
2735 // A merge of NULL or Casted-NotNull obj | |
2736 Node* res = _gvn.transform(phi); | |
2737 | |
2738 // Note I do NOT always 'replace_in_map(obj,result)' here. | |
2739 // if( tk->klass()->can_be_primary_super() ) | |
2740 // This means that if I successfully store an Object into an array-of-String | |
2741 // I 'forget' that the Object is really now known to be a String. I have to | |
2742 // do this because we don't have true union types for interfaces - if I store | |
2743 // a Baz into an array-of-Interface and then tell the optimizer it's an | |
2744 // Interface, I forget that it's also a Baz and cannot do Baz-like field | |
2745 // references to it. FIX THIS WHEN UNION TYPES APPEAR! | |
2746 // replace_in_map( obj, res ); | |
2747 | |
2748 // Return final merged results | |
2749 set_control( _gvn.transform(region) ); | |
2750 record_for_igvn(region); | |
2751 return res; | |
2752 } | |
2753 | |
2754 //------------------------------next_monitor----------------------------------- | |
2755 // What number should be given to the next monitor? | |
2756 int GraphKit::next_monitor() { | |
2757 int current = jvms()->monitor_depth()* C->sync_stack_slots(); | |
2758 int next = current + C->sync_stack_slots(); | |
2759 // Keep the toplevel high water mark current: | |
2760 if (C->fixed_slots() < next) C->set_fixed_slots(next); | |
2761 return current; | |
2762 } | |
2763 | |
2764 //------------------------------insert_mem_bar--------------------------------- | |
2765 // Memory barrier to avoid floating things around | |
2766 // The membar serves as a pinch point between both control and all memory slices. | |
2767 Node* GraphKit::insert_mem_bar(int opcode, Node* precedent) { | |
2768 MemBarNode* mb = MemBarNode::make(C, opcode, Compile::AliasIdxBot, precedent); | |
2769 mb->init_req(TypeFunc::Control, control()); | |
2770 mb->init_req(TypeFunc::Memory, reset_memory()); | |
2771 Node* membar = _gvn.transform(mb); | |
2772 set_control(_gvn.transform(new (C, 1) ProjNode(membar,TypeFunc::Control) )); | |
2773 set_all_memory_call(membar); | |
2774 return membar; | |
2775 } | |
2776 | |
2777 //-------------------------insert_mem_bar_volatile---------------------------- | |
2778 // Memory barrier to avoid floating things around | |
2779 // The membar serves as a pinch point between both control and memory(alias_idx). | |
2780 // If you want to make a pinch point on all memory slices, do not use this | |
2781 // function (even with AliasIdxBot); use insert_mem_bar() instead. | |
2782 Node* GraphKit::insert_mem_bar_volatile(int opcode, int alias_idx, Node* precedent) { | |
2783 // When Parse::do_put_xxx updates a volatile field, it appends a series | |
2784 // of MemBarVolatile nodes, one for *each* volatile field alias category. | |
2785 // The first membar is on the same memory slice as the field store opcode. | |
2786 // This forces the membar to follow the store. (Bug 6500685 broke this.) | |
2787 // All the other membars (for other volatile slices, including AliasIdxBot, | |
2788 // which stands for all unknown volatile slices) are control-dependent | |
2789 // on the first membar. This prevents later volatile loads or stores | |
2790 // from sliding up past the just-emitted store. | |
2791 | |
2792 MemBarNode* mb = MemBarNode::make(C, opcode, alias_idx, precedent); | |
2793 mb->set_req(TypeFunc::Control,control()); | |
2794 if (alias_idx == Compile::AliasIdxBot) { | |
2795 mb->set_req(TypeFunc::Memory, merged_memory()->base_memory()); | |
2796 } else { | |
2797 assert(!(opcode == Op_Initialize && alias_idx != Compile::AliasIdxRaw), "fix caller"); | |
2798 mb->set_req(TypeFunc::Memory, memory(alias_idx)); | |
2799 } | |
2800 Node* membar = _gvn.transform(mb); | |
2801 set_control(_gvn.transform(new (C, 1) ProjNode(membar, TypeFunc::Control))); | |
2802 if (alias_idx == Compile::AliasIdxBot) { | |
2803 merged_memory()->set_base_memory(_gvn.transform(new (C, 1) ProjNode(membar, TypeFunc::Memory))); | |
2804 } else { | |
2805 set_memory(_gvn.transform(new (C, 1) ProjNode(membar, TypeFunc::Memory)),alias_idx); | |
2806 } | |
2807 return membar; | |
2808 } | |
2809 | |
2810 //------------------------------shared_lock------------------------------------ | |
2811 // Emit locking code. | |
2812 FastLockNode* GraphKit::shared_lock(Node* obj) { | |
2813 // bci is either a monitorenter bc or InvocationEntryBci | |
2814 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces | |
2815 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); | |
2816 | |
2817 if( !GenerateSynchronizationCode ) | |
2818 return NULL; // Not locking things? | |
2819 if (stopped()) // Dead monitor? | |
2820 return NULL; | |
2821 | |
2822 assert(dead_locals_are_killed(), "should kill locals before sync. point"); | |
2823 | |
2824 // Box the stack location | |
2825 Node* box = _gvn.transform(new (C, 1) BoxLockNode(next_monitor())); | |
2826 Node* mem = reset_memory(); | |
2827 | |
2828 FastLockNode * flock = _gvn.transform(new (C, 3) FastLockNode(0, obj, box) )->as_FastLock(); | |
2829 if (PrintPreciseBiasedLockingStatistics) { | |
2830 // Create the counters for this fast lock. | |
2831 flock->create_lock_counter(sync_jvms()); // sync_jvms used to get current bci | |
2832 } | |
2833 // Add monitor to debug info for the slow path. If we block inside the | |
2834 // slow path and de-opt, we need the monitor hanging around | |
2835 map()->push_monitor( flock ); | |
2836 | |
2837 const TypeFunc *tf = LockNode::lock_type(); | |
2838 LockNode *lock = new (C, tf->domain()->cnt()) LockNode(C, tf); | |
2839 | |
2840 lock->init_req( TypeFunc::Control, control() ); | |
2841 lock->init_req( TypeFunc::Memory , mem ); | |
2842 lock->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
2843 lock->init_req( TypeFunc::FramePtr, frameptr() ); | |
2844 lock->init_req( TypeFunc::ReturnAdr, top() ); | |
2845 | |
2846 lock->init_req(TypeFunc::Parms + 0, obj); | |
2847 lock->init_req(TypeFunc::Parms + 1, box); | |
2848 lock->init_req(TypeFunc::Parms + 2, flock); | |
2849 add_safepoint_edges(lock); | |
2850 | |
2851 lock = _gvn.transform( lock )->as_Lock(); | |
2852 | |
2853 // lock has no side-effects, sets few values | |
2854 set_predefined_output_for_runtime_call(lock, mem, TypeRawPtr::BOTTOM); | |
2855 | |
2856 insert_mem_bar(Op_MemBarAcquire); | |
2857 | |
2858 // Add this to the worklist so that the lock can be eliminated | |
2859 record_for_igvn(lock); | |
2860 | |
2861 #ifndef PRODUCT | |
2862 if (PrintLockStatistics) { | |
2863 // Update the counter for this lock. Don't bother using an atomic | |
2864 // operation since we don't require absolute accuracy. | |
2865 lock->create_lock_counter(map()->jvms()); | |
1609 | 2866 increment_counter(lock->counter()->addr()); |
0 | 2867 } |
2868 #endif | |
2869 | |
2870 return flock; | |
2871 } | |
2872 | |
2873 | |
2874 //------------------------------shared_unlock---------------------------------- | |
2875 // Emit unlocking code. | |
2876 void GraphKit::shared_unlock(Node* box, Node* obj) { | |
2877 // bci is either a monitorenter bc or InvocationEntryBci | |
2878 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces | |
2879 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); | |
2880 | |
2881 if( !GenerateSynchronizationCode ) | |
2882 return; | |
2883 if (stopped()) { // Dead monitor? | |
2884 map()->pop_monitor(); // Kill monitor from debug info | |
2885 return; | |
2886 } | |
2887 | |
2888 // Memory barrier to avoid floating things down past the locked region | |
2889 insert_mem_bar(Op_MemBarRelease); | |
2890 | |
2891 const TypeFunc *tf = OptoRuntime::complete_monitor_exit_Type(); | |
2892 UnlockNode *unlock = new (C, tf->domain()->cnt()) UnlockNode(C, tf); | |
2893 uint raw_idx = Compile::AliasIdxRaw; | |
2894 unlock->init_req( TypeFunc::Control, control() ); | |
2895 unlock->init_req( TypeFunc::Memory , memory(raw_idx) ); | |
2896 unlock->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
2897 unlock->init_req( TypeFunc::FramePtr, frameptr() ); | |
2898 unlock->init_req( TypeFunc::ReturnAdr, top() ); | |
2899 | |
2900 unlock->init_req(TypeFunc::Parms + 0, obj); | |
2901 unlock->init_req(TypeFunc::Parms + 1, box); | |
2902 unlock = _gvn.transform(unlock)->as_Unlock(); | |
2903 | |
2904 Node* mem = reset_memory(); | |
2905 | |
2906 // unlock has no side-effects, sets few values | |
2907 set_predefined_output_for_runtime_call(unlock, mem, TypeRawPtr::BOTTOM); | |
2908 | |
2909 // Kill monitor from debug info | |
2910 map()->pop_monitor( ); | |
2911 } | |
2912 | |
2913 //-------------------------------get_layout_helper----------------------------- | |
2914 // If the given klass is a constant or known to be an array, | |
2915 // fetch the constant layout helper value into constant_value | |
2916 // and return (Node*)NULL. Otherwise, load the non-constant | |
2917 // layout helper value, and return the node which represents it. | |
2918 // This two-faced routine is useful because allocation sites | |
2919 // almost always feature constant types. | |
2920 Node* GraphKit::get_layout_helper(Node* klass_node, jint& constant_value) { | |
2921 const TypeKlassPtr* inst_klass = _gvn.type(klass_node)->isa_klassptr(); | |
2922 if (!StressReflectiveCode && inst_klass != NULL) { | |
2923 ciKlass* klass = inst_klass->klass(); | |
2924 bool xklass = inst_klass->klass_is_exact(); | |
2925 if (xklass || klass->is_array_klass()) { | |
2926 jint lhelper = klass->layout_helper(); | |
2927 if (lhelper != Klass::_lh_neutral_value) { | |
2928 constant_value = lhelper; | |
2929 return (Node*) NULL; | |
2930 } | |
2931 } | |
2932 } | |
2933 constant_value = Klass::_lh_neutral_value; // put in a known value | |
2934 Node* lhp = basic_plus_adr(klass_node, klass_node, Klass::layout_helper_offset_in_bytes() + sizeof(oopDesc)); | |
2935 return make_load(NULL, lhp, TypeInt::INT, T_INT); | |
2936 } | |
2937 | |
2938 // We just put in an allocate/initialize with a big raw-memory effect. | |
2939 // Hook selected additional alias categories on the initialization. | |
2940 static void hook_memory_on_init(GraphKit& kit, int alias_idx, | |
2941 MergeMemNode* init_in_merge, | |
2942 Node* init_out_raw) { | |
2943 DEBUG_ONLY(Node* init_in_raw = init_in_merge->base_memory()); | |
2944 assert(init_in_merge->memory_at(alias_idx) == init_in_raw, ""); | |
2945 | |
2946 Node* prevmem = kit.memory(alias_idx); | |
2947 init_in_merge->set_memory_at(alias_idx, prevmem); | |
2948 kit.set_memory(init_out_raw, alias_idx); | |
2949 } | |
2950 | |
2951 //---------------------------set_output_for_allocation------------------------- | |
2952 Node* GraphKit::set_output_for_allocation(AllocateNode* alloc, | |
2953 const TypeOopPtr* oop_type, | |
2954 bool raw_mem_only) { | |
2955 int rawidx = Compile::AliasIdxRaw; | |
2956 alloc->set_req( TypeFunc::FramePtr, frameptr() ); | |
2957 add_safepoint_edges(alloc); | |
2958 Node* allocx = _gvn.transform(alloc); | |
2959 set_control( _gvn.transform(new (C, 1) ProjNode(allocx, TypeFunc::Control) ) ); | |
2960 // create memory projection for i_o | |
2961 set_memory ( _gvn.transform( new (C, 1) ProjNode(allocx, TypeFunc::Memory, true) ), rawidx ); | |
2962 make_slow_call_ex(allocx, env()->OutOfMemoryError_klass(), true); | |
2963 | |
2964 // create a memory projection as for the normal control path | |
2965 Node* malloc = _gvn.transform(new (C, 1) ProjNode(allocx, TypeFunc::Memory)); | |
2966 set_memory(malloc, rawidx); | |
2967 | |
2968 // a normal slow-call doesn't change i_o, but an allocation does | |
2969 // we create a separate i_o projection for the normal control path | |
2970 set_i_o(_gvn.transform( new (C, 1) ProjNode(allocx, TypeFunc::I_O, false) ) ); | |
2971 Node* rawoop = _gvn.transform( new (C, 1) ProjNode(allocx, TypeFunc::Parms) ); | |
2972 | |
2973 // put in an initialization barrier | |
2974 InitializeNode* init = insert_mem_bar_volatile(Op_Initialize, rawidx, | |
2975 rawoop)->as_Initialize(); | |
2976 assert(alloc->initialization() == init, "2-way macro link must work"); | |
2977 assert(init ->allocation() == alloc, "2-way macro link must work"); | |
2978 if (ReduceFieldZeroing && !raw_mem_only) { | |
2979 // Extract memory strands which may participate in the new object's | |
2980 // initialization, and source them from the new InitializeNode. | |
2981 // This will allow us to observe initializations when they occur, | |
2982 // and link them properly (as a group) to the InitializeNode. | |
2983 assert(init->in(InitializeNode::Memory) == malloc, ""); | |
2984 MergeMemNode* minit_in = MergeMemNode::make(C, malloc); | |
2985 init->set_req(InitializeNode::Memory, minit_in); | |
2986 record_for_igvn(minit_in); // fold it up later, if possible | |
2987 Node* minit_out = memory(rawidx); | |
2988 assert(minit_out->is_Proj() && minit_out->in(0) == init, ""); | |
2989 if (oop_type->isa_aryptr()) { | |
2990 const TypePtr* telemref = oop_type->add_offset(Type::OffsetBot); | |
2991 int elemidx = C->get_alias_index(telemref); | |
2992 hook_memory_on_init(*this, elemidx, minit_in, minit_out); | |
2993 } else if (oop_type->isa_instptr()) { | |
2994 ciInstanceKlass* ik = oop_type->klass()->as_instance_klass(); | |
2995 for (int i = 0, len = ik->nof_nonstatic_fields(); i < len; i++) { | |
2996 ciField* field = ik->nonstatic_field_at(i); | |
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2997 if (field->offset() >= TrackedInitializationLimit * HeapWordSize) |
0 | 2998 continue; // do not bother to track really large numbers of fields |
2999 // Find (or create) the alias category for this field: | |
3000 int fieldidx = C->alias_type(field)->index(); | |
3001 hook_memory_on_init(*this, fieldidx, minit_in, minit_out); | |
3002 } | |
3003 } | |
3004 } | |
3005 | |
3006 // Cast raw oop to the real thing... | |
3007 Node* javaoop = new (C, 2) CheckCastPPNode(control(), rawoop, oop_type); | |
3008 javaoop = _gvn.transform(javaoop); | |
3009 C->set_recent_alloc(control(), javaoop); | |
3010 assert(just_allocated_object(control()) == javaoop, "just allocated"); | |
3011 | |
3012 #ifdef ASSERT | |
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3013 { // Verify that the AllocateNode::Ideal_allocation recognizers work: |
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3014 assert(AllocateNode::Ideal_allocation(rawoop, &_gvn) == alloc, |
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3015 "Ideal_allocation works"); |
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3016 assert(AllocateNode::Ideal_allocation(javaoop, &_gvn) == alloc, |
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3017 "Ideal_allocation works"); |
0 | 3018 if (alloc->is_AllocateArray()) { |
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3019 assert(AllocateArrayNode::Ideal_array_allocation(rawoop, &_gvn) == alloc->as_AllocateArray(), |
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3020 "Ideal_allocation works"); |
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3021 assert(AllocateArrayNode::Ideal_array_allocation(javaoop, &_gvn) == alloc->as_AllocateArray(), |
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3022 "Ideal_allocation works"); |
0 | 3023 } else { |
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3024 assert(alloc->in(AllocateNode::ALength)->is_top(), "no length, please"); |
0 | 3025 } |
3026 } | |
3027 #endif //ASSERT | |
3028 | |
3029 return javaoop; | |
3030 } | |
3031 | |
3032 //---------------------------new_instance-------------------------------------- | |
3033 // This routine takes a klass_node which may be constant (for a static type) | |
3034 // or may be non-constant (for reflective code). It will work equally well | |
3035 // for either, and the graph will fold nicely if the optimizer later reduces | |
3036 // the type to a constant. | |
3037 // The optional arguments are for specialized use by intrinsics: | |
3038 // - If 'extra_slow_test' if not null is an extra condition for the slow-path. | |
3039 // - If 'raw_mem_only', do not cast the result to an oop. | |
3040 // - If 'return_size_val', report the the total object size to the caller. | |
3041 Node* GraphKit::new_instance(Node* klass_node, | |
3042 Node* extra_slow_test, | |
3043 bool raw_mem_only, // affect only raw memory | |
3044 Node* *return_size_val) { | |
3045 // Compute size in doublewords | |
3046 // The size is always an integral number of doublewords, represented | |
3047 // as a positive bytewise size stored in the klass's layout_helper. | |
3048 // The layout_helper also encodes (in a low bit) the need for a slow path. | |
3049 jint layout_con = Klass::_lh_neutral_value; | |
3050 Node* layout_val = get_layout_helper(klass_node, layout_con); | |
3051 int layout_is_con = (layout_val == NULL); | |
3052 | |
3053 if (extra_slow_test == NULL) extra_slow_test = intcon(0); | |
3054 // Generate the initial go-slow test. It's either ALWAYS (return a | |
3055 // Node for 1) or NEVER (return a NULL) or perhaps (in the reflective | |
3056 // case) a computed value derived from the layout_helper. | |
3057 Node* initial_slow_test = NULL; | |
3058 if (layout_is_con) { | |
3059 assert(!StressReflectiveCode, "stress mode does not use these paths"); | |
3060 bool must_go_slow = Klass::layout_helper_needs_slow_path(layout_con); | |
3061 initial_slow_test = must_go_slow? intcon(1): extra_slow_test; | |
3062 | |
3063 } else { // reflective case | |
3064 // This reflective path is used by Unsafe.allocateInstance. | |
3065 // (It may be stress-tested by specifying StressReflectiveCode.) | |
3066 // Basically, we want to get into the VM is there's an illegal argument. | |
3067 Node* bit = intcon(Klass::_lh_instance_slow_path_bit); | |
3068 initial_slow_test = _gvn.transform( new (C, 3) AndINode(layout_val, bit) ); | |
3069 if (extra_slow_test != intcon(0)) { | |
3070 initial_slow_test = _gvn.transform( new (C, 3) OrINode(initial_slow_test, extra_slow_test) ); | |
3071 } | |
3072 // (Macro-expander will further convert this to a Bool, if necessary.) | |
3073 } | |
3074 | |
3075 // Find the size in bytes. This is easy; it's the layout_helper. | |
3076 // The size value must be valid even if the slow path is taken. | |
3077 Node* size = NULL; | |
3078 if (layout_is_con) { | |
3079 size = MakeConX(Klass::layout_helper_size_in_bytes(layout_con)); | |
3080 } else { // reflective case | |
3081 // This reflective path is used by clone and Unsafe.allocateInstance. | |
3082 size = ConvI2X(layout_val); | |
3083 | |
3084 // Clear the low bits to extract layout_helper_size_in_bytes: | |
3085 assert((int)Klass::_lh_instance_slow_path_bit < BytesPerLong, "clear bit"); | |
3086 Node* mask = MakeConX(~ (intptr_t)right_n_bits(LogBytesPerLong)); | |
3087 size = _gvn.transform( new (C, 3) AndXNode(size, mask) ); | |
3088 } | |
3089 if (return_size_val != NULL) { | |
3090 (*return_size_val) = size; | |
3091 } | |
3092 | |
3093 // This is a precise notnull oop of the klass. | |
3094 // (Actually, it need not be precise if this is a reflective allocation.) | |
3095 // It's what we cast the result to. | |
3096 const TypeKlassPtr* tklass = _gvn.type(klass_node)->isa_klassptr(); | |
3097 if (!tklass) tklass = TypeKlassPtr::OBJECT; | |
3098 const TypeOopPtr* oop_type = tklass->as_instance_type(); | |
3099 | |
3100 // Now generate allocation code | |
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3101 |
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3102 // The entire memory state is needed for slow path of the allocation |
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3103 // since GC and deoptimization can happened. |
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3104 Node *mem = reset_memory(); |
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3105 set_all_memory(mem); // Create new memory state |
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3106 |
0 | 3107 AllocateNode* alloc |
3108 = new (C, AllocateNode::ParmLimit) | |
3109 AllocateNode(C, AllocateNode::alloc_type(), | |
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3110 control(), mem, i_o(), |
0 | 3111 size, klass_node, |
3112 initial_slow_test); | |
3113 | |
3114 return set_output_for_allocation(alloc, oop_type, raw_mem_only); | |
3115 } | |
3116 | |
3117 //-------------------------------new_array------------------------------------- | |
3118 // helper for both newarray and anewarray | |
3119 // The 'length' parameter is (obviously) the length of the array. | |
3120 // See comments on new_instance for the meaning of the other arguments. | |
3121 Node* GraphKit::new_array(Node* klass_node, // array klass (maybe variable) | |
3122 Node* length, // number of array elements | |
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3123 int nargs, // number of arguments to push back for uncommon trap |
0 | 3124 bool raw_mem_only, // affect only raw memory |
3125 Node* *return_size_val) { | |
3126 jint layout_con = Klass::_lh_neutral_value; | |
3127 Node* layout_val = get_layout_helper(klass_node, layout_con); | |
3128 int layout_is_con = (layout_val == NULL); | |
3129 | |
3130 if (!layout_is_con && !StressReflectiveCode && | |
3131 !too_many_traps(Deoptimization::Reason_class_check)) { | |
3132 // This is a reflective array creation site. | |
3133 // Optimistically assume that it is a subtype of Object[], | |
3134 // so that we can fold up all the address arithmetic. | |
3135 layout_con = Klass::array_layout_helper(T_OBJECT); | |
3136 Node* cmp_lh = _gvn.transform( new(C, 3) CmpINode(layout_val, intcon(layout_con)) ); | |
3137 Node* bol_lh = _gvn.transform( new(C, 2) BoolNode(cmp_lh, BoolTest::eq) ); | |
3138 { BuildCutout unless(this, bol_lh, PROB_MAX); | |
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3139 _sp += nargs; |
0 | 3140 uncommon_trap(Deoptimization::Reason_class_check, |
3141 Deoptimization::Action_maybe_recompile); | |
3142 } | |
3143 layout_val = NULL; | |
3144 layout_is_con = true; | |
3145 } | |
3146 | |
3147 // Generate the initial go-slow test. Make sure we do not overflow | |
3148 // if length is huge (near 2Gig) or negative! We do not need | |
3149 // exact double-words here, just a close approximation of needed | |
3150 // double-words. We can't add any offset or rounding bits, lest we | |
3151 // take a size -1 of bytes and make it positive. Use an unsigned | |
3152 // compare, so negative sizes look hugely positive. | |
3153 int fast_size_limit = FastAllocateSizeLimit; | |
3154 if (layout_is_con) { | |
3155 assert(!StressReflectiveCode, "stress mode does not use these paths"); | |
3156 // Increase the size limit if we have exact knowledge of array type. | |
3157 int log2_esize = Klass::layout_helper_log2_element_size(layout_con); | |
3158 fast_size_limit <<= (LogBytesPerLong - log2_esize); | |
3159 } | |
3160 | |
3161 Node* initial_slow_cmp = _gvn.transform( new (C, 3) CmpUNode( length, intcon( fast_size_limit ) ) ); | |
3162 Node* initial_slow_test = _gvn.transform( new (C, 2) BoolNode( initial_slow_cmp, BoolTest::gt ) ); | |
3163 if (initial_slow_test->is_Bool()) { | |
3164 // Hide it behind a CMoveI, or else PhaseIdealLoop::split_up will get sick. | |
3165 initial_slow_test = initial_slow_test->as_Bool()->as_int_value(&_gvn); | |
3166 } | |
3167 | |
3168 // --- Size Computation --- | |
3169 // array_size = round_to_heap(array_header + (length << elem_shift)); | |
3170 // where round_to_heap(x) == round_to(x, MinObjAlignmentInBytes) | |
3171 // and round_to(x, y) == ((x + y-1) & ~(y-1)) | |
3172 // The rounding mask is strength-reduced, if possible. | |
3173 int round_mask = MinObjAlignmentInBytes - 1; | |
3174 Node* header_size = NULL; | |
3175 int header_size_min = arrayOopDesc::base_offset_in_bytes(T_BYTE); | |
3176 // (T_BYTE has the weakest alignment and size restrictions...) | |
3177 if (layout_is_con) { | |
3178 int hsize = Klass::layout_helper_header_size(layout_con); | |
3179 int eshift = Klass::layout_helper_log2_element_size(layout_con); | |
3180 BasicType etype = Klass::layout_helper_element_type(layout_con); | |
3181 if ((round_mask & ~right_n_bits(eshift)) == 0) | |
3182 round_mask = 0; // strength-reduce it if it goes away completely | |
3183 assert((hsize & right_n_bits(eshift)) == 0, "hsize is pre-rounded"); | |
3184 assert(header_size_min <= hsize, "generic minimum is smallest"); | |
3185 header_size_min = hsize; | |
3186 header_size = intcon(hsize + round_mask); | |
3187 } else { | |
3188 Node* hss = intcon(Klass::_lh_header_size_shift); | |
3189 Node* hsm = intcon(Klass::_lh_header_size_mask); | |
3190 Node* hsize = _gvn.transform( new(C, 3) URShiftINode(layout_val, hss) ); | |
3191 hsize = _gvn.transform( new(C, 3) AndINode(hsize, hsm) ); | |
3192 Node* mask = intcon(round_mask); | |
3193 header_size = _gvn.transform( new(C, 3) AddINode(hsize, mask) ); | |
3194 } | |
3195 | |
3196 Node* elem_shift = NULL; | |
3197 if (layout_is_con) { | |
3198 int eshift = Klass::layout_helper_log2_element_size(layout_con); | |
3199 if (eshift != 0) | |
3200 elem_shift = intcon(eshift); | |
3201 } else { | |
3202 // There is no need to mask or shift this value. | |
3203 // The semantics of LShiftINode include an implicit mask to 0x1F. | |
3204 assert(Klass::_lh_log2_element_size_shift == 0, "use shift in place"); | |
3205 elem_shift = layout_val; | |
3206 } | |
3207 | |
3208 // Transition to native address size for all offset calculations: | |
3209 Node* lengthx = ConvI2X(length); | |
3210 Node* headerx = ConvI2X(header_size); | |
3211 #ifdef _LP64 | |
3212 { const TypeLong* tllen = _gvn.find_long_type(lengthx); | |
3213 if (tllen != NULL && tllen->_lo < 0) { | |
3214 // Add a manual constraint to a positive range. Cf. array_element_address. | |
3215 jlong size_max = arrayOopDesc::max_array_length(T_BYTE); | |
3216 if (size_max > tllen->_hi) size_max = tllen->_hi; | |
3217 const TypeLong* tlcon = TypeLong::make(CONST64(0), size_max, Type::WidenMin); | |
3218 lengthx = _gvn.transform( new (C, 2) ConvI2LNode(length, tlcon)); | |
3219 } | |
3220 } | |
3221 #endif | |
3222 | |
3223 // Combine header size (plus rounding) and body size. Then round down. | |
3224 // This computation cannot overflow, because it is used only in two | |
3225 // places, one where the length is sharply limited, and the other | |
3226 // after a successful allocation. | |
3227 Node* abody = lengthx; | |
3228 if (elem_shift != NULL) | |
3229 abody = _gvn.transform( new(C, 3) LShiftXNode(lengthx, elem_shift) ); | |
3230 Node* size = _gvn.transform( new(C, 3) AddXNode(headerx, abody) ); | |
3231 if (round_mask != 0) { | |
3232 Node* mask = MakeConX(~round_mask); | |
3233 size = _gvn.transform( new(C, 3) AndXNode(size, mask) ); | |
3234 } | |
3235 // else if round_mask == 0, the size computation is self-rounding | |
3236 | |
3237 if (return_size_val != NULL) { | |
3238 // This is the size | |
3239 (*return_size_val) = size; | |
3240 } | |
3241 | |
3242 // Now generate allocation code | |
74
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3243 |
565
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3244 // The entire memory state is needed for slow path of the allocation |
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3245 // since GC and deoptimization can happened. |
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3246 Node *mem = reset_memory(); |
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|
3247 set_all_memory(mem); // Create new memory state |
74
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3248 |
0 | 3249 // Create the AllocateArrayNode and its result projections |
3250 AllocateArrayNode* alloc | |
3251 = new (C, AllocateArrayNode::ParmLimit) | |
3252 AllocateArrayNode(C, AllocateArrayNode::alloc_type(), | |
74
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3253 control(), mem, i_o(), |
0 | 3254 size, klass_node, |
3255 initial_slow_test, | |
3256 length); | |
3257 | |
3258 // Cast to correct type. Note that the klass_node may be constant or not, | |
3259 // and in the latter case the actual array type will be inexact also. | |
3260 // (This happens via a non-constant argument to inline_native_newArray.) | |
3261 // In any case, the value of klass_node provides the desired array type. | |
3262 const TypeInt* length_type = _gvn.find_int_type(length); | |
3263 const TypeOopPtr* ary_type = _gvn.type(klass_node)->is_klassptr()->as_instance_type(); | |
3264 if (ary_type->isa_aryptr() && length_type != NULL) { | |
3265 // Try to get a better type than POS for the size | |
3266 ary_type = ary_type->is_aryptr()->cast_to_size(length_type); | |
3267 } | |
3268 | |
3269 Node* javaoop = set_output_for_allocation(alloc, ary_type, raw_mem_only); | |
3270 | |
366
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3271 // Cast length on remaining path to be as narrow as possible |
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3272 if (map()->find_edge(length) >= 0) { |
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3273 Node* ccast = alloc->make_ideal_length(ary_type, &_gvn); |
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3274 if (ccast != length) { |
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3275 _gvn.set_type_bottom(ccast); |
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3276 record_for_igvn(ccast); |
0 | 3277 replace_in_map(length, ccast); |
3278 } | |
3279 } | |
3280 | |
3281 return javaoop; | |
3282 } | |
3283 | |
3284 // The following "Ideal_foo" functions are placed here because they recognize | |
3285 // the graph shapes created by the functions immediately above. | |
3286 | |
3287 //---------------------------Ideal_allocation---------------------------------- | |
3288 // Given an oop pointer or raw pointer, see if it feeds from an AllocateNode. | |
3289 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase) { | |
3290 if (ptr == NULL) { // reduce dumb test in callers | |
3291 return NULL; | |
3292 } | |
3293 if (ptr->is_CheckCastPP()) { // strip a raw-to-oop cast | |
3294 ptr = ptr->in(1); | |
3295 if (ptr == NULL) return NULL; | |
3296 } | |
3297 if (ptr->is_Proj()) { | |
3298 Node* allo = ptr->in(0); | |
3299 if (allo != NULL && allo->is_Allocate()) { | |
3300 return allo->as_Allocate(); | |
3301 } | |
3302 } | |
3303 // Report failure to match. | |
3304 return NULL; | |
3305 } | |
3306 | |
3307 // Fancy version which also strips off an offset (and reports it to caller). | |
3308 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase, | |
3309 intptr_t& offset) { | |
3310 Node* base = AddPNode::Ideal_base_and_offset(ptr, phase, offset); | |
3311 if (base == NULL) return NULL; | |
3312 return Ideal_allocation(base, phase); | |
3313 } | |
3314 | |
3315 // Trace Initialize <- Proj[Parm] <- Allocate | |
3316 AllocateNode* InitializeNode::allocation() { | |
3317 Node* rawoop = in(InitializeNode::RawAddress); | |
3318 if (rawoop->is_Proj()) { | |
3319 Node* alloc = rawoop->in(0); | |
3320 if (alloc->is_Allocate()) { | |
3321 return alloc->as_Allocate(); | |
3322 } | |
3323 } | |
3324 return NULL; | |
3325 } | |
3326 | |
3327 // Trace Allocate -> Proj[Parm] -> Initialize | |
3328 InitializeNode* AllocateNode::initialization() { | |
3329 ProjNode* rawoop = proj_out(AllocateNode::RawAddress); | |
3330 if (rawoop == NULL) return NULL; | |
3331 for (DUIterator_Fast imax, i = rawoop->fast_outs(imax); i < imax; i++) { | |
3332 Node* init = rawoop->fast_out(i); | |
3333 if (init->is_Initialize()) { | |
3334 assert(init->as_Initialize()->allocation() == this, "2-way link"); | |
3335 return init->as_Initialize(); | |
3336 } | |
3337 } | |
3338 return NULL; | |
3339 } | |
342
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3340 |
851
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3341 //----------------------------- store barriers ---------------------------- |
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3342 #define __ ideal. |
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3343 |
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3344 void GraphKit::sync_kit(IdealKit& ideal) { |
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3345 // Final sync IdealKit and graphKit. |
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3346 __ drain_delay_transform(); |
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3347 set_all_memory(__ merged_memory()); |
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|
3348 set_control(__ ctrl()); |
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|
3349 } |
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|
3350 |
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3351 // vanilla/CMS post barrier |
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|
3352 // Insert a write-barrier store. This is to let generational GC work; we have |
fc4be448891f
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3353 // to flag all oop-stores before the next GC point. |
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3354 void GraphKit::write_barrier_post(Node* oop_store, |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3355 Node* obj, |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3356 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
|
3357 uint adr_idx, |
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3358 Node* val, |
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|
3359 bool use_precise) { |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3360 // No store check needed if we're storing a NULL or an old object |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3361 // (latter case is probably a string constant). The concurrent |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3362 // mark sweep garbage collector, however, needs to have all nonNull |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3363 // oop updates flagged via card-marks. |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3364 if (val != NULL && val->is_Con()) { |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3365 // must be either an oop or NULL |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3366 const Type* t = val->bottom_type(); |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3367 if (t == TypePtr::NULL_PTR || t == Type::TOP) |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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diff
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|
3368 // stores of null never (?) need barriers |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3369 return; |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3370 ciObject* con = t->is_oopptr()->const_oop(); |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3371 if (con != NULL |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3372 && con->is_perm() |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3373 && Universe::heap()->can_elide_permanent_oop_store_barriers()) |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3374 // no store barrier needed, because no old-to-new ref created |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3375 return; |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3376 } |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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diff
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|
3377 |
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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985
diff
changeset
|
3378 if (use_ReduceInitialCardMarks() |
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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985
diff
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|
3379 && obj == just_allocated_object(control())) { |
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
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985
diff
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|
3380 // We can skip marks on a freshly-allocated object in Eden. |
1166 | 3381 // Keep this code in sync with new_store_pre_barrier() in runtime.cpp. |
3382 // That routine informs GC to take appropriate compensating steps, | |
3383 // upon a slow-path allocation, so as to make this card-mark | |
3384 // elision safe. | |
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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diff
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|
3385 return; |
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6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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985
diff
changeset
|
3386 } |
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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985
diff
changeset
|
3387 |
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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diff
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|
3388 if (!use_precise) { |
fc4be448891f
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|
3389 // All card marks for a (non-array) instance are in one place: |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3390 adr = obj; |
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|
3391 } |
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|
3392 // (Else it's an array (or unknown), and we want more precise card marks.) |
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|
3393 assert(adr != NULL, ""); |
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|
3394 |
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|
3395 IdealKit ideal(gvn(), control(), merged_memory(), true); |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3396 |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3397 // Convert the pointer to an int prior to doing math on it |
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|
3398 Node* cast = __ CastPX(__ ctrl(), adr); |
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|
3399 |
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|
3400 // Divide by card size |
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|
3401 assert(Universe::heap()->barrier_set()->kind() == BarrierSet::CardTableModRef, |
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|
3402 "Only one we handle so far."); |
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|
3403 Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) ); |
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|
3404 |
fc4be448891f
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|
3405 // Combine card table base and card offset |
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|
3406 Node* card_adr = __ AddP(__ top(), byte_map_base_node(), card_offset ); |
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3407 |
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3408 // Get the alias_index for raw card-mark memory |
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3409 int adr_type = Compile::AliasIdxRaw; |
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3410 // Smash zero into card |
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3411 Node* zero = __ ConI(0); |
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3412 BasicType bt = T_BYTE; |
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3413 if( !UseConcMarkSweepGC ) { |
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3414 __ store(__ ctrl(), card_adr, zero, bt, adr_type); |
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3415 } else { |
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3416 // Specialized path for CM store barrier |
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3417 __ storeCM(__ ctrl(), card_adr, zero, oop_store, adr_idx, bt, adr_type); |
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3418 } |
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3419 |
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3420 // Final sync IdealKit and GraphKit. |
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3421 sync_kit(ideal); |
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3422 } |
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3423 |
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3424 // G1 pre/post barriers |
342
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3425 void GraphKit::g1_write_barrier_pre(Node* obj, |
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3426 Node* adr, |
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3427 uint alias_idx, |
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3428 Node* val, |
825 | 3429 const TypeOopPtr* val_type, |
342
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3430 BasicType bt) { |
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3431 IdealKit ideal(gvn(), control(), merged_memory(), true); |
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3432 |
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3433 Node* tls = __ thread(); // ThreadLocalStorage |
342
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3434 |
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3435 Node* no_ctrl = NULL; |
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3436 Node* no_base = __ top(); |
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3437 Node* zero = __ ConI(0); |
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3438 |
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3439 float likely = PROB_LIKELY(0.999); |
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3440 float unlikely = PROB_UNLIKELY(0.999); |
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3441 |
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3442 BasicType active_type = in_bytes(PtrQueue::byte_width_of_active()) == 4 ? T_INT : T_BYTE; |
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3443 assert(in_bytes(PtrQueue::byte_width_of_active()) == 4 || in_bytes(PtrQueue::byte_width_of_active()) == 1, "flag width"); |
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3444 |
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3445 // Offsets into the thread |
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3446 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 648 |
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3447 PtrQueue::byte_offset_of_active()); |
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3448 const int index_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 656 |
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3449 PtrQueue::byte_offset_of_index()); |
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3450 const int buffer_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 652 |
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3451 PtrQueue::byte_offset_of_buf()); |
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3452 // Now the actual pointers into the thread |
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3453 |
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3454 // set_control( ctl); |
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3455 |
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3456 Node* marking_adr = __ AddP(no_base, tls, __ ConX(marking_offset)); |
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3457 Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset)); |
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3458 Node* index_adr = __ AddP(no_base, tls, __ ConX(index_offset)); |
342
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3459 |
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3460 // Now some of the values |
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3461 |
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3462 Node* marking = __ load(__ ctrl(), marking_adr, TypeInt::INT, active_type, Compile::AliasIdxRaw); |
342
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3463 |
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3464 // if (!marking) |
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3465 __ if_then(marking, BoolTest::ne, zero); { |
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3466 Node* index = __ load(__ ctrl(), index_adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw); |
342
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3467 |
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3468 const Type* t1 = adr->bottom_type(); |
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|
3469 const Type* t2 = val->bottom_type(); |
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|
3470 |
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3471 Node* orig = __ load(no_ctrl, adr, val_type, bt, alias_idx); |
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3472 // if (orig != NULL) |
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3473 __ if_then(orig, BoolTest::ne, null()); { |
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3474 Node* buffer = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw); |
342
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3475 |
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|
3476 // load original value |
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|
3477 // alias_idx correct?? |
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|
3478 |
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|
3479 // is the queue for this thread full? |
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3480 __ if_then(index, BoolTest::ne, zero, likely); { |
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|
3481 |
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|
3482 // decrement the index |
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3483 Node* next_index = __ SubI(index, __ ConI(sizeof(intptr_t))); |
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3484 Node* next_indexX = next_index; |
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|
3485 #ifdef _LP64 |
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3486 // We could refine the type for what it's worth |
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3487 // const TypeLong* lidxtype = TypeLong::make(CONST64(0), get_size_from_queue); |
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3488 next_indexX = _gvn.transform( new (C, 2) ConvI2LNode(next_index, TypeLong::make(0, max_jlong, Type::WidenMax)) ); |
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3489 #endif |
342
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3490 |
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3491 // Now get the buffer location we will log the original value into and store it |
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3492 Node *log_addr = __ AddP(no_base, buffer, next_indexX); |
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3493 __ store(__ ctrl(), log_addr, orig, T_OBJECT, Compile::AliasIdxRaw); |
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3494 |
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|
3495 // update the index |
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3496 __ store(__ ctrl(), index_adr, next_index, T_INT, Compile::AliasIdxRaw); |
342
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3497 |
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|
3498 } __ else_(); { |
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|
3499 |
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3500 // logging buffer is full, call the runtime |
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|
3501 const TypeFunc *tf = OptoRuntime::g1_wb_pre_Type(); |
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3502 __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), "g1_wb_pre", orig, tls); |
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3503 } __ end_if(); // (!index) |
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3504 } __ end_if(); // (orig != NULL) |
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3505 } __ end_if(); // (!marking) |
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3506 |
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3507 // Final sync IdealKit and GraphKit. |
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3508 sync_kit(ideal); |
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3509 } |
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|
3510 |
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3511 // |
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|
3512 // Update the card table and add card address to the queue |
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3513 // |
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3514 void GraphKit::g1_mark_card(IdealKit& ideal, |
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3515 Node* card_adr, |
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3516 Node* oop_store, |
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3517 uint oop_alias_idx, |
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3518 Node* index, |
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3519 Node* index_adr, |
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|
3520 Node* buffer, |
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3521 const TypeFunc* tf) { |
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3522 |
342
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3523 Node* zero = __ ConI(0); |
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3524 Node* no_base = __ top(); |
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3525 BasicType card_bt = T_BYTE; |
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3526 // Smash zero into card. MUST BE ORDERED WRT TO STORE |
985
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3527 __ storeCM(__ ctrl(), card_adr, zero, oop_store, oop_alias_idx, card_bt, Compile::AliasIdxRaw); |
342
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3528 |
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3529 // Now do the queue work |
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3530 __ if_then(index, BoolTest::ne, zero); { |
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3531 |
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3532 Node* next_index = __ SubI(index, __ ConI(sizeof(intptr_t))); |
342
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3533 Node* next_indexX = next_index; |
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3534 #ifdef _LP64 |
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3535 // We could refine the type for what it's worth |
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3536 // const TypeLong* lidxtype = TypeLong::make(CONST64(0), get_size_from_queue); |
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3537 next_indexX = _gvn.transform( new (C, 2) ConvI2LNode(next_index, TypeLong::make(0, max_jlong, Type::WidenMax)) ); |
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3538 #endif // _LP64 |
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3539 Node* log_addr = __ AddP(no_base, buffer, next_indexX); |
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3540 |
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3541 __ store(__ ctrl(), log_addr, card_adr, T_ADDRESS, Compile::AliasIdxRaw); |
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3542 __ store(__ ctrl(), index_adr, next_index, T_INT, Compile::AliasIdxRaw); |
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3543 |
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3544 } __ else_(); { |
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3545 __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), "g1_wb_post", card_adr, __ thread()); |
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3546 } __ end_if(); |
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3547 |
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3548 } |
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3549 |
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3550 void GraphKit::g1_write_barrier_post(Node* oop_store, |
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3551 Node* obj, |
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3552 Node* adr, |
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3553 uint alias_idx, |
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3554 Node* val, |
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3555 BasicType bt, |
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3556 bool use_precise) { |
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3557 // If we are writing a NULL then we need no post barrier |
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3558 |
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3559 if (val != NULL && val->is_Con() && val->bottom_type() == TypePtr::NULL_PTR) { |
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3560 // Must be NULL |
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3561 const Type* t = val->bottom_type(); |
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3562 assert(t == Type::TOP || t == TypePtr::NULL_PTR, "must be NULL"); |
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3563 // No post barrier if writing NULLx |
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3564 return; |
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3565 } |
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3566 |
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3567 if (!use_precise) { |
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3568 // All card marks for a (non-array) instance are in one place: |
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3569 adr = obj; |
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3570 } |
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3571 // (Else it's an array (or unknown), and we want more precise card marks.) |
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3572 assert(adr != NULL, ""); |
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3573 |
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3574 IdealKit ideal(gvn(), control(), merged_memory(), true); |
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3575 |
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3576 Node* tls = __ thread(); // ThreadLocalStorage |
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3577 |
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3578 Node* no_base = __ top(); |
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3579 float likely = PROB_LIKELY(0.999); |
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3580 float unlikely = PROB_UNLIKELY(0.999); |
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3581 Node* zero = __ ConI(0); |
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3582 Node* zeroX = __ ConX(0); |
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3583 |
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3584 // Get the alias_index for raw card-mark memory |
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3585 const TypePtr* card_type = TypeRawPtr::BOTTOM; |
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3586 |
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3587 const TypeFunc *tf = OptoRuntime::g1_wb_post_Type(); |
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3588 |
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3589 // Offsets into the thread |
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3590 const int index_offset = in_bytes(JavaThread::dirty_card_queue_offset() + |
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3591 PtrQueue::byte_offset_of_index()); |
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3592 const int buffer_offset = in_bytes(JavaThread::dirty_card_queue_offset() + |
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3593 PtrQueue::byte_offset_of_buf()); |
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3594 |
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3595 // Pointers into the thread |
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3596 |
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3597 Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset)); |
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3598 Node* index_adr = __ AddP(no_base, tls, __ ConX(index_offset)); |
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3599 |
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3600 // Now some values |
1593
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|
3601 // Use ctrl to avoid hoisting these values past a safepoint, which could |
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3602 // potentially reset these fields in the JavaThread. |
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3603 Node* index = __ load(__ ctrl(), index_adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw); |
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3604 Node* buffer = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw); |
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3605 |
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3606 // Convert the store obj pointer to an int prior to doing math on it |
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3607 // Must use ctrl to prevent "integerized oop" existing across safepoint |
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3608 Node* cast = __ CastPX(__ ctrl(), adr); |
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3609 |
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3610 // Divide pointer by card size |
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3611 Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) ); |
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3612 |
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3613 // Combine card table base and card offset |
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3614 Node* card_adr = __ AddP(no_base, byte_map_base_node(), card_offset ); |
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3615 |
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3616 // If we know the value being stored does it cross regions? |
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3617 |
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3618 if (val != NULL) { |
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3619 // Does the store cause us to cross regions? |
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3620 |
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3621 // Should be able to do an unsigned compare of region_size instead of |
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3622 // and extra shift. Do we have an unsigned compare?? |
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3623 // Node* region_size = __ ConI(1 << HeapRegion::LogOfHRGrainBytes); |
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3624 Node* xor_res = __ URShiftX ( __ XorX( cast, __ CastPX(__ ctrl(), val)), __ ConI(HeapRegion::LogOfHRGrainBytes)); |
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3625 |
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3626 // if (xor_res == 0) same region so skip |
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3627 __ if_then(xor_res, BoolTest::ne, zeroX); { |
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3628 |
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3629 // No barrier if we are storing a NULL |
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3630 __ if_then(val, BoolTest::ne, null(), unlikely); { |
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3631 |
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3632 // Ok must mark the card if not already dirty |
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|
3633 |
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3634 // load the original value of the card |
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3635 Node* card_val = __ load(__ ctrl(), card_adr, TypeInt::INT, T_BYTE, Compile::AliasIdxRaw); |
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3636 |
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3637 __ if_then(card_val, BoolTest::ne, zero); { |
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3638 g1_mark_card(ideal, card_adr, oop_store, alias_idx, index, index_adr, buffer, tf); |
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3639 } __ end_if(); |
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3640 } __ end_if(); |
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3641 } __ end_if(); |
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3642 } else { |
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3643 // Object.clone() instrinsic uses this path. |
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3644 g1_mark_card(ideal, card_adr, oop_store, alias_idx, index, index_adr, buffer, tf); |
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3645 } |
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3646 |
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3647 // Final sync IdealKit and GraphKit. |
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3648 sync_kit(ideal); |
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3649 } |
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3650 #undef __ |