Mercurial > hg > graal-compiler
annotate src/share/vm/opto/graphKit.cpp @ 1751:2528b5bd749c
6980262: Memory leak when exception is thrown in static initializer
Summary: Use resource memory instead of c-heap for the exception message
Reviewed-by: phh, jmasa
author | kamg |
---|---|
date | Fri, 27 Aug 2010 15:05:28 -0400 |
parents | 4311f23817fd |
children | 4b29a725c43c |
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 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_graphKit.cpp.incl" | |
27 | |
28 //----------------------------GraphKit----------------------------------------- | |
29 // Main utility constructor. | |
30 GraphKit::GraphKit(JVMState* jvms) | |
31 : Phase(Phase::Parser), | |
32 _env(C->env()), | |
33 _gvn(*C->initial_gvn()) | |
34 { | |
35 _exceptions = jvms->map()->next_exception(); | |
36 if (_exceptions != NULL) jvms->map()->set_next_exception(NULL); | |
37 set_jvms(jvms); | |
38 } | |
39 | |
40 // Private constructor for parser. | |
41 GraphKit::GraphKit() | |
42 : Phase(Phase::Parser), | |
43 _env(C->env()), | |
44 _gvn(*C->initial_gvn()) | |
45 { | |
46 _exceptions = NULL; | |
47 set_map(NULL); | |
48 debug_only(_sp = -99); | |
49 debug_only(set_bci(-99)); | |
50 } | |
51 | |
52 | |
53 | |
54 //---------------------------clean_stack--------------------------------------- | |
55 // Clear away rubbish from the stack area of the JVM state. | |
56 // This destroys any arguments that may be waiting on the stack. | |
57 void GraphKit::clean_stack(int from_sp) { | |
58 SafePointNode* map = this->map(); | |
59 JVMState* jvms = this->jvms(); | |
60 int stk_size = jvms->stk_size(); | |
61 int stkoff = jvms->stkoff(); | |
62 Node* top = this->top(); | |
63 for (int i = from_sp; i < stk_size; i++) { | |
64 if (map->in(stkoff + i) != top) { | |
65 map->set_req(stkoff + i, top); | |
66 } | |
67 } | |
68 } | |
69 | |
70 | |
71 //--------------------------------sync_jvms----------------------------------- | |
72 // Make sure our current jvms agrees with our parse state. | |
73 JVMState* GraphKit::sync_jvms() const { | |
74 JVMState* jvms = this->jvms(); | |
75 jvms->set_bci(bci()); // Record the new bci in the JVMState | |
76 jvms->set_sp(sp()); // Record the new sp in the JVMState | |
77 assert(jvms_in_sync(), "jvms is now in sync"); | |
78 return jvms; | |
79 } | |
80 | |
81 #ifdef ASSERT | |
82 bool GraphKit::jvms_in_sync() const { | |
83 Parse* parse = is_Parse(); | |
84 if (parse == NULL) { | |
85 if (bci() != jvms()->bci()) return false; | |
86 if (sp() != (int)jvms()->sp()) return false; | |
87 return true; | |
88 } | |
89 if (jvms()->method() != parse->method()) return false; | |
90 if (jvms()->bci() != parse->bci()) return false; | |
91 int jvms_sp = jvms()->sp(); | |
92 if (jvms_sp != parse->sp()) return false; | |
93 int jvms_depth = jvms()->depth(); | |
94 if (jvms_depth != parse->depth()) return false; | |
95 return true; | |
96 } | |
97 | |
98 // Local helper checks for special internal merge points | |
99 // used to accumulate and merge exception states. | |
100 // They are marked by the region's in(0) edge being the map itself. | |
101 // Such merge points must never "escape" into the parser at large, | |
102 // until they have been handed to gvn.transform. | |
103 static bool is_hidden_merge(Node* reg) { | |
104 if (reg == NULL) return false; | |
105 if (reg->is_Phi()) { | |
106 reg = reg->in(0); | |
107 if (reg == NULL) return false; | |
108 } | |
109 return reg->is_Region() && reg->in(0) != NULL && reg->in(0)->is_Root(); | |
110 } | |
111 | |
112 void GraphKit::verify_map() const { | |
113 if (map() == NULL) return; // null map is OK | |
114 assert(map()->req() <= jvms()->endoff(), "no extra garbage on map"); | |
115 assert(!map()->has_exceptions(), "call add_exception_states_from 1st"); | |
116 assert(!is_hidden_merge(control()), "call use_exception_state, not set_map"); | |
117 } | |
118 | |
119 void GraphKit::verify_exception_state(SafePointNode* ex_map) { | |
120 assert(ex_map->next_exception() == NULL, "not already part of a chain"); | |
121 assert(has_saved_ex_oop(ex_map), "every exception state has an ex_oop"); | |
122 } | |
123 #endif | |
124 | |
125 //---------------------------stop_and_kill_map--------------------------------- | |
126 // Set _map to NULL, signalling a stop to further bytecode execution. | |
127 // First smash the current map's control to a constant, to mark it dead. | |
128 void GraphKit::stop_and_kill_map() { | |
129 SafePointNode* dead_map = stop(); | |
130 if (dead_map != NULL) { | |
131 dead_map->disconnect_inputs(NULL); // Mark the map as killed. | |
132 assert(dead_map->is_killed(), "must be so marked"); | |
133 } | |
134 } | |
135 | |
136 | |
137 //--------------------------------stopped-------------------------------------- | |
138 // Tell if _map is NULL, or control is top. | |
139 bool GraphKit::stopped() { | |
140 if (map() == NULL) return true; | |
141 else if (control() == top()) return true; | |
142 else return false; | |
143 } | |
144 | |
145 | |
146 //-----------------------------has_ex_handler---------------------------------- | |
147 // Tell if this method or any caller method has exception handlers. | |
148 bool GraphKit::has_ex_handler() { | |
149 for (JVMState* jvmsp = jvms(); jvmsp != NULL; jvmsp = jvmsp->caller()) { | |
150 if (jvmsp->has_method() && jvmsp->method()->has_exception_handlers()) { | |
151 return true; | |
152 } | |
153 } | |
154 return false; | |
155 } | |
156 | |
157 //------------------------------save_ex_oop------------------------------------ | |
158 // Save an exception without blowing stack contents or other JVM state. | |
159 void GraphKit::set_saved_ex_oop(SafePointNode* ex_map, Node* ex_oop) { | |
160 assert(!has_saved_ex_oop(ex_map), "clear ex-oop before setting again"); | |
161 ex_map->add_req(ex_oop); | |
162 debug_only(verify_exception_state(ex_map)); | |
163 } | |
164 | |
165 inline static Node* common_saved_ex_oop(SafePointNode* ex_map, bool clear_it) { | |
166 assert(GraphKit::has_saved_ex_oop(ex_map), "ex_oop must be there"); | |
167 Node* ex_oop = ex_map->in(ex_map->req()-1); | |
168 if (clear_it) ex_map->del_req(ex_map->req()-1); | |
169 return ex_oop; | |
170 } | |
171 | |
172 //-----------------------------saved_ex_oop------------------------------------ | |
173 // Recover a saved exception from its map. | |
174 Node* GraphKit::saved_ex_oop(SafePointNode* ex_map) { | |
175 return common_saved_ex_oop(ex_map, false); | |
176 } | |
177 | |
178 //--------------------------clear_saved_ex_oop--------------------------------- | |
179 // Erase a previously saved exception from its map. | |
180 Node* GraphKit::clear_saved_ex_oop(SafePointNode* ex_map) { | |
181 return common_saved_ex_oop(ex_map, true); | |
182 } | |
183 | |
184 #ifdef ASSERT | |
185 //---------------------------has_saved_ex_oop---------------------------------- | |
186 // Erase a previously saved exception from its map. | |
187 bool GraphKit::has_saved_ex_oop(SafePointNode* ex_map) { | |
188 return ex_map->req() == ex_map->jvms()->endoff()+1; | |
189 } | |
190 #endif | |
191 | |
192 //-------------------------make_exception_state-------------------------------- | |
193 // Turn the current JVM state into an exception state, appending the ex_oop. | |
194 SafePointNode* GraphKit::make_exception_state(Node* ex_oop) { | |
195 sync_jvms(); | |
196 SafePointNode* ex_map = stop(); // do not manipulate this map any more | |
197 set_saved_ex_oop(ex_map, ex_oop); | |
198 return ex_map; | |
199 } | |
200 | |
201 | |
202 //--------------------------add_exception_state-------------------------------- | |
203 // Add an exception to my list of exceptions. | |
204 void GraphKit::add_exception_state(SafePointNode* ex_map) { | |
205 if (ex_map == NULL || ex_map->control() == top()) { | |
206 return; | |
207 } | |
208 #ifdef ASSERT | |
209 verify_exception_state(ex_map); | |
210 if (has_exceptions()) { | |
211 assert(ex_map->jvms()->same_calls_as(_exceptions->jvms()), "all collected exceptions must come from the same place"); | |
212 } | |
213 #endif | |
214 | |
215 // If there is already an exception of exactly this type, merge with it. | |
216 // In particular, null-checks and other low-level exceptions common up here. | |
217 Node* ex_oop = saved_ex_oop(ex_map); | |
218 const Type* ex_type = _gvn.type(ex_oop); | |
219 if (ex_oop == top()) { | |
220 // No action needed. | |
221 return; | |
222 } | |
223 assert(ex_type->isa_instptr(), "exception must be an instance"); | |
224 for (SafePointNode* e2 = _exceptions; e2 != NULL; e2 = e2->next_exception()) { | |
225 const Type* ex_type2 = _gvn.type(saved_ex_oop(e2)); | |
226 // We check sp also because call bytecodes can generate exceptions | |
227 // both before and after arguments are popped! | |
228 if (ex_type2 == ex_type | |
229 && e2->_jvms->sp() == ex_map->_jvms->sp()) { | |
230 combine_exception_states(ex_map, e2); | |
231 return; | |
232 } | |
233 } | |
234 | |
235 // No pre-existing exception of the same type. Chain it on the list. | |
236 push_exception_state(ex_map); | |
237 } | |
238 | |
239 //-----------------------add_exception_states_from----------------------------- | |
240 void GraphKit::add_exception_states_from(JVMState* jvms) { | |
241 SafePointNode* ex_map = jvms->map()->next_exception(); | |
242 if (ex_map != NULL) { | |
243 jvms->map()->set_next_exception(NULL); | |
244 for (SafePointNode* next_map; ex_map != NULL; ex_map = next_map) { | |
245 next_map = ex_map->next_exception(); | |
246 ex_map->set_next_exception(NULL); | |
247 add_exception_state(ex_map); | |
248 } | |
249 } | |
250 } | |
251 | |
252 //-----------------------transfer_exceptions_into_jvms------------------------- | |
253 JVMState* GraphKit::transfer_exceptions_into_jvms() { | |
254 if (map() == NULL) { | |
255 // We need a JVMS to carry the exceptions, but the map has gone away. | |
256 // Create a scratch JVMS, cloned from any of the exception states... | |
257 if (has_exceptions()) { | |
258 _map = _exceptions; | |
259 _map = clone_map(); | |
260 _map->set_next_exception(NULL); | |
261 clear_saved_ex_oop(_map); | |
262 debug_only(verify_map()); | |
263 } else { | |
264 // ...or created from scratch | |
265 JVMState* jvms = new (C) JVMState(_method, NULL); | |
266 jvms->set_bci(_bci); | |
267 jvms->set_sp(_sp); | |
268 jvms->set_map(new (C, TypeFunc::Parms) SafePointNode(TypeFunc::Parms, jvms)); | |
269 set_jvms(jvms); | |
270 for (uint i = 0; i < map()->req(); i++) map()->init_req(i, top()); | |
271 set_all_memory(top()); | |
272 while (map()->req() < jvms->endoff()) map()->add_req(top()); | |
273 } | |
274 // (This is a kludge, in case you didn't notice.) | |
275 set_control(top()); | |
276 } | |
277 JVMState* jvms = sync_jvms(); | |
278 assert(!jvms->map()->has_exceptions(), "no exceptions on this map yet"); | |
279 jvms->map()->set_next_exception(_exceptions); | |
280 _exceptions = NULL; // done with this set of exceptions | |
281 return jvms; | |
282 } | |
283 | |
284 static inline void add_n_reqs(Node* dstphi, Node* srcphi) { | |
285 assert(is_hidden_merge(dstphi), "must be a special merge node"); | |
286 assert(is_hidden_merge(srcphi), "must be a special merge node"); | |
287 uint limit = srcphi->req(); | |
288 for (uint i = PhiNode::Input; i < limit; i++) { | |
289 dstphi->add_req(srcphi->in(i)); | |
290 } | |
291 } | |
292 static inline void add_one_req(Node* dstphi, Node* src) { | |
293 assert(is_hidden_merge(dstphi), "must be a special merge node"); | |
294 assert(!is_hidden_merge(src), "must not be a special merge node"); | |
295 dstphi->add_req(src); | |
296 } | |
297 | |
298 //-----------------------combine_exception_states------------------------------ | |
299 // This helper function combines exception states by building phis on a | |
300 // specially marked state-merging region. These regions and phis are | |
301 // untransformed, and can build up gradually. The region is marked by | |
302 // having a control input of its exception map, rather than NULL. Such | |
303 // regions do not appear except in this function, and in use_exception_state. | |
304 void GraphKit::combine_exception_states(SafePointNode* ex_map, SafePointNode* phi_map) { | |
305 if (failing()) return; // dying anyway... | |
306 JVMState* ex_jvms = ex_map->_jvms; | |
307 assert(ex_jvms->same_calls_as(phi_map->_jvms), "consistent call chains"); | |
308 assert(ex_jvms->stkoff() == phi_map->_jvms->stkoff(), "matching locals"); | |
309 assert(ex_jvms->sp() == phi_map->_jvms->sp(), "matching stack sizes"); | |
310 assert(ex_jvms->monoff() == phi_map->_jvms->monoff(), "matching JVMS"); | |
311 assert(ex_map->req() == phi_map->req(), "matching maps"); | |
312 uint tos = ex_jvms->stkoff() + ex_jvms->sp(); | |
313 Node* hidden_merge_mark = root(); | |
314 Node* region = phi_map->control(); | |
315 MergeMemNode* phi_mem = phi_map->merged_memory(); | |
316 MergeMemNode* ex_mem = ex_map->merged_memory(); | |
317 if (region->in(0) != hidden_merge_mark) { | |
318 // The control input is not (yet) a specially-marked region in phi_map. | |
319 // Make it so, and build some phis. | |
320 region = new (C, 2) RegionNode(2); | |
321 _gvn.set_type(region, Type::CONTROL); | |
322 region->set_req(0, hidden_merge_mark); // marks an internal ex-state | |
323 region->init_req(1, phi_map->control()); | |
324 phi_map->set_control(region); | |
325 Node* io_phi = PhiNode::make(region, phi_map->i_o(), Type::ABIO); | |
326 record_for_igvn(io_phi); | |
327 _gvn.set_type(io_phi, Type::ABIO); | |
328 phi_map->set_i_o(io_phi); | |
329 for (MergeMemStream mms(phi_mem); mms.next_non_empty(); ) { | |
330 Node* m = mms.memory(); | |
331 Node* m_phi = PhiNode::make(region, m, Type::MEMORY, mms.adr_type(C)); | |
332 record_for_igvn(m_phi); | |
333 _gvn.set_type(m_phi, Type::MEMORY); | |
334 mms.set_memory(m_phi); | |
335 } | |
336 } | |
337 | |
338 // Either or both of phi_map and ex_map might already be converted into phis. | |
339 Node* ex_control = ex_map->control(); | |
340 // if there is special marking on ex_map also, we add multiple edges from src | |
341 bool add_multiple = (ex_control->in(0) == hidden_merge_mark); | |
342 // how wide was the destination phi_map, originally? | |
343 uint orig_width = region->req(); | |
344 | |
345 if (add_multiple) { | |
346 add_n_reqs(region, ex_control); | |
347 add_n_reqs(phi_map->i_o(), ex_map->i_o()); | |
348 } else { | |
349 // ex_map has no merges, so we just add single edges everywhere | |
350 add_one_req(region, ex_control); | |
351 add_one_req(phi_map->i_o(), ex_map->i_o()); | |
352 } | |
353 for (MergeMemStream mms(phi_mem, ex_mem); mms.next_non_empty2(); ) { | |
354 if (mms.is_empty()) { | |
355 // get a copy of the base memory, and patch some inputs into it | |
356 const TypePtr* adr_type = mms.adr_type(C); | |
357 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type); | |
358 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), ""); | |
359 mms.set_memory(phi); | |
360 // Prepare to append interesting stuff onto the newly sliced phi: | |
361 while (phi->req() > orig_width) phi->del_req(phi->req()-1); | |
362 } | |
363 // Append stuff from ex_map: | |
364 if (add_multiple) { | |
365 add_n_reqs(mms.memory(), mms.memory2()); | |
366 } else { | |
367 add_one_req(mms.memory(), mms.memory2()); | |
368 } | |
369 } | |
370 uint limit = ex_map->req(); | |
371 for (uint i = TypeFunc::Parms; i < limit; i++) { | |
372 // Skip everything in the JVMS after tos. (The ex_oop follows.) | |
373 if (i == tos) i = ex_jvms->monoff(); | |
374 Node* src = ex_map->in(i); | |
375 Node* dst = phi_map->in(i); | |
376 if (src != dst) { | |
377 PhiNode* phi; | |
378 if (dst->in(0) != region) { | |
379 dst = phi = PhiNode::make(region, dst, _gvn.type(dst)); | |
380 record_for_igvn(phi); | |
381 _gvn.set_type(phi, phi->type()); | |
382 phi_map->set_req(i, dst); | |
383 // Prepare to append interesting stuff onto the new phi: | |
384 while (dst->req() > orig_width) dst->del_req(dst->req()-1); | |
385 } else { | |
386 assert(dst->is_Phi(), "nobody else uses a hidden region"); | |
387 phi = (PhiNode*)dst; | |
388 } | |
389 if (add_multiple && src->in(0) == ex_control) { | |
390 // Both are phis. | |
391 add_n_reqs(dst, src); | |
392 } else { | |
393 while (dst->req() < region->req()) add_one_req(dst, src); | |
394 } | |
395 const Type* srctype = _gvn.type(src); | |
396 if (phi->type() != srctype) { | |
397 const Type* dsttype = phi->type()->meet(srctype); | |
398 if (phi->type() != dsttype) { | |
399 phi->set_type(dsttype); | |
400 _gvn.set_type(phi, dsttype); | |
401 } | |
402 } | |
403 } | |
404 } | |
405 } | |
406 | |
407 //--------------------------use_exception_state-------------------------------- | |
408 Node* GraphKit::use_exception_state(SafePointNode* phi_map) { | |
409 if (failing()) { stop(); return top(); } | |
410 Node* region = phi_map->control(); | |
411 Node* hidden_merge_mark = root(); | |
412 assert(phi_map->jvms()->map() == phi_map, "sanity: 1-1 relation"); | |
413 Node* ex_oop = clear_saved_ex_oop(phi_map); | |
414 if (region->in(0) == hidden_merge_mark) { | |
415 // Special marking for internal ex-states. Process the phis now. | |
416 region->set_req(0, region); // now it's an ordinary region | |
417 set_jvms(phi_map->jvms()); // ...so now we can use it as a map | |
418 // Note: Setting the jvms also sets the bci and sp. | |
419 set_control(_gvn.transform(region)); | |
420 uint tos = jvms()->stkoff() + sp(); | |
421 for (uint i = 1; i < tos; i++) { | |
422 Node* x = phi_map->in(i); | |
423 if (x->in(0) == region) { | |
424 assert(x->is_Phi(), "expected a special phi"); | |
425 phi_map->set_req(i, _gvn.transform(x)); | |
426 } | |
427 } | |
428 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) { | |
429 Node* x = mms.memory(); | |
430 if (x->in(0) == region) { | |
431 assert(x->is_Phi(), "nobody else uses a hidden region"); | |
432 mms.set_memory(_gvn.transform(x)); | |
433 } | |
434 } | |
435 if (ex_oop->in(0) == region) { | |
436 assert(ex_oop->is_Phi(), "expected a special phi"); | |
437 ex_oop = _gvn.transform(ex_oop); | |
438 } | |
439 } else { | |
440 set_jvms(phi_map->jvms()); | |
441 } | |
442 | |
443 assert(!is_hidden_merge(phi_map->control()), "hidden ex. states cleared"); | |
444 assert(!is_hidden_merge(phi_map->i_o()), "hidden ex. states cleared"); | |
445 return ex_oop; | |
446 } | |
447 | |
448 //---------------------------------java_bc------------------------------------- | |
449 Bytecodes::Code GraphKit::java_bc() const { | |
450 ciMethod* method = this->method(); | |
451 int bci = this->bci(); | |
452 if (method != NULL && bci != InvocationEntryBci) | |
453 return method->java_code_at_bci(bci); | |
454 else | |
455 return Bytecodes::_illegal; | |
456 } | |
457 | |
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458 void GraphKit::uncommon_trap_if_should_post_on_exceptions(Deoptimization::DeoptReason reason, |
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459 bool must_throw) { |
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460 // if the exception capability is set, then we will generate code |
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461 // to check the JavaThread.should_post_on_exceptions flag to see |
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462 // if we actually need to report exception events (for this |
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463 // thread). If we don't need to report exception events, we will |
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464 // take the normal fast path provided by add_exception_events. If |
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465 // exception event reporting is enabled for this thread, we will |
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466 // take the uncommon_trap in the BuildCutout below. |
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467 |
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468 // first must access the should_post_on_exceptions_flag in this thread's JavaThread |
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469 Node* jthread = _gvn.transform(new (C, 1) ThreadLocalNode()); |
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470 Node* adr = basic_plus_adr(top(), jthread, in_bytes(JavaThread::should_post_on_exceptions_flag_offset())); |
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471 Node* should_post_flag = make_load(control(), adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw, false); |
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472 |
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473 // Test the should_post_on_exceptions_flag vs. 0 |
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474 Node* chk = _gvn.transform( new (C, 3) CmpINode(should_post_flag, intcon(0)) ); |
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475 Node* tst = _gvn.transform( new (C, 2) BoolNode(chk, BoolTest::eq) ); |
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476 |
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477 // Branch to slow_path if should_post_on_exceptions_flag was true |
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478 { BuildCutout unless(this, tst, PROB_MAX); |
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479 // Do not try anything fancy if we're notifying the VM on every throw. |
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480 // Cf. case Bytecodes::_athrow in parse2.cpp. |
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481 uncommon_trap(reason, Deoptimization::Action_none, |
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482 (ciKlass*)NULL, (char*)NULL, must_throw); |
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483 } |
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484 |
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485 } |
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486 |
0 | 487 //------------------------------builtin_throw---------------------------------- |
488 void GraphKit::builtin_throw(Deoptimization::DeoptReason reason, Node* arg) { | |
489 bool must_throw = true; | |
490 | |
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491 if (env()->jvmti_can_post_on_exceptions()) { |
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492 // check if we must post exception events, take uncommon trap if so |
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493 uncommon_trap_if_should_post_on_exceptions(reason, must_throw); |
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494 // here if should_post_on_exceptions is false |
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495 // continue on with the normal codegen |
0 | 496 } |
497 | |
498 // If this particular condition has not yet happened at this | |
499 // bytecode, then use the uncommon trap mechanism, and allow for | |
500 // a future recompilation if several traps occur here. | |
501 // If the throw is hot, try to use a more complicated inline mechanism | |
502 // which keeps execution inside the compiled code. | |
503 bool treat_throw_as_hot = false; | |
504 ciMethodData* md = method()->method_data(); | |
505 | |
506 if (ProfileTraps) { | |
507 if (too_many_traps(reason)) { | |
508 treat_throw_as_hot = true; | |
509 } | |
510 // (If there is no MDO at all, assume it is early in | |
511 // execution, and that any deopts are part of the | |
512 // startup transient, and don't need to be remembered.) | |
513 | |
514 // Also, if there is a local exception handler, treat all throws | |
515 // as hot if there has been at least one in this method. | |
516 if (C->trap_count(reason) != 0 | |
517 && method()->method_data()->trap_count(reason) != 0 | |
518 && has_ex_handler()) { | |
519 treat_throw_as_hot = true; | |
520 } | |
521 } | |
522 | |
523 // If this throw happens frequently, an uncommon trap might cause | |
524 // a performance pothole. If there is a local exception handler, | |
525 // and if this particular bytecode appears to be deoptimizing often, | |
526 // let us handle the throw inline, with a preconstructed instance. | |
527 // Note: If the deopt count has blown up, the uncommon trap | |
528 // runtime is going to flush this nmethod, not matter what. | |
529 if (treat_throw_as_hot | |
530 && (!StackTraceInThrowable || OmitStackTraceInFastThrow)) { | |
531 // If the throw is local, we use a pre-existing instance and | |
532 // punt on the backtrace. This would lead to a missing backtrace | |
533 // (a repeat of 4292742) if the backtrace object is ever asked | |
534 // for its backtrace. | |
535 // Fixing this remaining case of 4292742 requires some flavor of | |
536 // escape analysis. Leave that for the future. | |
537 ciInstance* ex_obj = NULL; | |
538 switch (reason) { | |
539 case Deoptimization::Reason_null_check: | |
540 ex_obj = env()->NullPointerException_instance(); | |
541 break; | |
542 case Deoptimization::Reason_div0_check: | |
543 ex_obj = env()->ArithmeticException_instance(); | |
544 break; | |
545 case Deoptimization::Reason_range_check: | |
546 ex_obj = env()->ArrayIndexOutOfBoundsException_instance(); | |
547 break; | |
548 case Deoptimization::Reason_class_check: | |
549 if (java_bc() == Bytecodes::_aastore) { | |
550 ex_obj = env()->ArrayStoreException_instance(); | |
551 } else { | |
552 ex_obj = env()->ClassCastException_instance(); | |
553 } | |
554 break; | |
555 } | |
556 if (failing()) { stop(); return; } // exception allocation might fail | |
557 if (ex_obj != NULL) { | |
558 // Cheat with a preallocated exception object. | |
559 if (C->log() != NULL) | |
560 C->log()->elem("hot_throw preallocated='1' reason='%s'", | |
561 Deoptimization::trap_reason_name(reason)); | |
562 const TypeInstPtr* ex_con = TypeInstPtr::make(ex_obj); | |
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563 Node* ex_node = _gvn.transform( ConNode::make(C, ex_con) ); |
0 | 564 |
565 // Clear the detail message of the preallocated exception object. | |
566 // Weblogic sometimes mutates the detail message of exceptions | |
567 // using reflection. | |
568 int offset = java_lang_Throwable::get_detailMessage_offset(); | |
569 const TypePtr* adr_typ = ex_con->add_offset(offset); | |
570 | |
571 Node *adr = basic_plus_adr(ex_node, ex_node, offset); | |
572 Node *store = store_oop_to_object(control(), ex_node, adr, adr_typ, null(), ex_con, T_OBJECT); | |
573 | |
574 add_exception_state(make_exception_state(ex_node)); | |
575 return; | |
576 } | |
577 } | |
578 | |
579 // %%% Maybe add entry to OptoRuntime which directly throws the exc.? | |
580 // It won't be much cheaper than bailing to the interp., since we'll | |
581 // have to pass up all the debug-info, and the runtime will have to | |
582 // create the stack trace. | |
583 | |
584 // Usual case: Bail to interpreter. | |
585 // Reserve the right to recompile if we haven't seen anything yet. | |
586 | |
587 Deoptimization::DeoptAction action = Deoptimization::Action_maybe_recompile; | |
588 if (treat_throw_as_hot | |
589 && (method()->method_data()->trap_recompiled_at(bci()) | |
590 || C->too_many_traps(reason))) { | |
591 // We cannot afford to take more traps here. Suffer in the interpreter. | |
592 if (C->log() != NULL) | |
593 C->log()->elem("hot_throw preallocated='0' reason='%s' mcount='%d'", | |
594 Deoptimization::trap_reason_name(reason), | |
595 C->trap_count(reason)); | |
596 action = Deoptimization::Action_none; | |
597 } | |
598 | |
599 // "must_throw" prunes the JVM state to include only the stack, if there | |
600 // are no local exception handlers. This should cut down on register | |
601 // allocation time and code size, by drastically reducing the number | |
602 // of in-edges on the call to the uncommon trap. | |
603 | |
604 uncommon_trap(reason, action, (ciKlass*)NULL, (char*)NULL, must_throw); | |
605 } | |
606 | |
607 | |
608 //----------------------------PreserveJVMState--------------------------------- | |
609 PreserveJVMState::PreserveJVMState(GraphKit* kit, bool clone_map) { | |
610 debug_only(kit->verify_map()); | |
611 _kit = kit; | |
612 _map = kit->map(); // preserve the map | |
613 _sp = kit->sp(); | |
614 kit->set_map(clone_map ? kit->clone_map() : NULL); | |
615 #ifdef ASSERT | |
616 _bci = kit->bci(); | |
617 Parse* parser = kit->is_Parse(); | |
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618 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); |
0 | 619 _block = block; |
620 #endif | |
621 } | |
622 PreserveJVMState::~PreserveJVMState() { | |
623 GraphKit* kit = _kit; | |
624 #ifdef ASSERT | |
625 assert(kit->bci() == _bci, "bci must not shift"); | |
626 Parse* parser = kit->is_Parse(); | |
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627 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); |
0 | 628 assert(block == _block, "block must not shift"); |
629 #endif | |
630 kit->set_map(_map); | |
631 kit->set_sp(_sp); | |
632 } | |
633 | |
634 | |
635 //-----------------------------BuildCutout------------------------------------- | |
636 BuildCutout::BuildCutout(GraphKit* kit, Node* p, float prob, float cnt) | |
637 : PreserveJVMState(kit) | |
638 { | |
639 assert(p->is_Con() || p->is_Bool(), "test must be a bool"); | |
640 SafePointNode* outer_map = _map; // preserved map is caller's | |
641 SafePointNode* inner_map = kit->map(); | |
642 IfNode* iff = kit->create_and_map_if(outer_map->control(), p, prob, cnt); | |
643 outer_map->set_control(kit->gvn().transform( new (kit->C, 1) IfTrueNode(iff) )); | |
644 inner_map->set_control(kit->gvn().transform( new (kit->C, 1) IfFalseNode(iff) )); | |
645 } | |
646 BuildCutout::~BuildCutout() { | |
647 GraphKit* kit = _kit; | |
648 assert(kit->stopped(), "cutout code must stop, throw, return, etc."); | |
649 } | |
650 | |
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651 //---------------------------PreserveReexecuteState---------------------------- |
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652 PreserveReexecuteState::PreserveReexecuteState(GraphKit* kit) { |
950
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653 assert(!kit->stopped(), "must call stopped() before"); |
900
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654 _kit = kit; |
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655 _sp = kit->sp(); |
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656 _reexecute = kit->jvms()->_reexecute; |
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657 } |
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658 PreserveReexecuteState::~PreserveReexecuteState() { |
950
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659 if (_kit->stopped()) return; |
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660 _kit->jvms()->_reexecute = _reexecute; |
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661 _kit->set_sp(_sp); |
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662 } |
0 | 663 |
664 //------------------------------clone_map-------------------------------------- | |
665 // Implementation of PreserveJVMState | |
666 // | |
667 // Only clone_map(...) here. If this function is only used in the | |
668 // PreserveJVMState class we may want to get rid of this extra | |
669 // function eventually and do it all there. | |
670 | |
671 SafePointNode* GraphKit::clone_map() { | |
672 if (map() == NULL) return NULL; | |
673 | |
674 // Clone the memory edge first | |
675 Node* mem = MergeMemNode::make(C, map()->memory()); | |
676 gvn().set_type_bottom(mem); | |
677 | |
678 SafePointNode *clonemap = (SafePointNode*)map()->clone(); | |
679 JVMState* jvms = this->jvms(); | |
680 JVMState* clonejvms = jvms->clone_shallow(C); | |
681 clonemap->set_memory(mem); | |
682 clonemap->set_jvms(clonejvms); | |
683 clonejvms->set_map(clonemap); | |
684 record_for_igvn(clonemap); | |
685 gvn().set_type_bottom(clonemap); | |
686 return clonemap; | |
687 } | |
688 | |
689 | |
690 //-----------------------------set_map_clone----------------------------------- | |
691 void GraphKit::set_map_clone(SafePointNode* m) { | |
692 _map = m; | |
693 _map = clone_map(); | |
694 _map->set_next_exception(NULL); | |
695 debug_only(verify_map()); | |
696 } | |
697 | |
698 | |
699 //----------------------------kill_dead_locals--------------------------------- | |
700 // Detect any locals which are known to be dead, and force them to top. | |
701 void GraphKit::kill_dead_locals() { | |
702 // Consult the liveness information for the locals. If any | |
703 // of them are unused, then they can be replaced by top(). This | |
704 // should help register allocation time and cut down on the size | |
705 // of the deoptimization information. | |
706 | |
707 // This call is made from many of the bytecode handling | |
708 // subroutines called from the Big Switch in do_one_bytecode. | |
709 // Every bytecode which might include a slow path is responsible | |
710 // for killing its dead locals. The more consistent we | |
711 // are about killing deads, the fewer useless phis will be | |
712 // constructed for them at various merge points. | |
713 | |
714 // bci can be -1 (InvocationEntryBci). We return the entry | |
715 // liveness for the method. | |
716 | |
717 if (method() == NULL || method()->code_size() == 0) { | |
718 // We are building a graph for a call to a native method. | |
719 // All locals are live. | |
720 return; | |
721 } | |
722 | |
723 ResourceMark rm; | |
724 | |
725 // Consult the liveness information for the locals. If any | |
726 // of them are unused, then they can be replaced by top(). This | |
727 // should help register allocation time and cut down on the size | |
728 // of the deoptimization information. | |
729 MethodLivenessResult live_locals = method()->liveness_at_bci(bci()); | |
730 | |
731 int len = (int)live_locals.size(); | |
732 assert(len <= jvms()->loc_size(), "too many live locals"); | |
733 for (int local = 0; local < len; local++) { | |
734 if (!live_locals.at(local)) { | |
735 set_local(local, top()); | |
736 } | |
737 } | |
738 } | |
739 | |
740 #ifdef ASSERT | |
741 //-------------------------dead_locals_are_killed------------------------------ | |
742 // Return true if all dead locals are set to top in the map. | |
743 // Used to assert "clean" debug info at various points. | |
744 bool GraphKit::dead_locals_are_killed() { | |
745 if (method() == NULL || method()->code_size() == 0) { | |
746 // No locals need to be dead, so all is as it should be. | |
747 return true; | |
748 } | |
749 | |
750 // Make sure somebody called kill_dead_locals upstream. | |
751 ResourceMark rm; | |
752 for (JVMState* jvms = this->jvms(); jvms != NULL; jvms = jvms->caller()) { | |
753 if (jvms->loc_size() == 0) continue; // no locals to consult | |
754 SafePointNode* map = jvms->map(); | |
755 ciMethod* method = jvms->method(); | |
756 int bci = jvms->bci(); | |
757 if (jvms == this->jvms()) { | |
758 bci = this->bci(); // it might not yet be synched | |
759 } | |
760 MethodLivenessResult live_locals = method->liveness_at_bci(bci); | |
761 int len = (int)live_locals.size(); | |
762 if (!live_locals.is_valid() || len == 0) | |
763 // This method is trivial, or is poisoned by a breakpoint. | |
764 return true; | |
765 assert(len == jvms->loc_size(), "live map consistent with locals map"); | |
766 for (int local = 0; local < len; local++) { | |
767 if (!live_locals.at(local) && map->local(jvms, local) != top()) { | |
768 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
769 tty->print_cr("Zombie local %d: ", local); | |
770 jvms->dump(); | |
771 } | |
772 return false; | |
773 } | |
774 } | |
775 } | |
776 return true; | |
777 } | |
778 | |
779 #endif //ASSERT | |
780 | |
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781 // Helper function for enforcing certain bytecodes to reexecute if |
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782 // deoptimization happens |
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783 static bool should_reexecute_implied_by_bytecode(JVMState *jvms, bool is_anewarray) { |
900
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784 ciMethod* cur_method = jvms->method(); |
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785 int cur_bci = jvms->bci(); |
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786 if (cur_method != NULL && cur_bci != InvocationEntryBci) { |
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787 Bytecodes::Code code = cur_method->java_code_at_bci(cur_bci); |
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788 return Interpreter::bytecode_should_reexecute(code) || |
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789 is_anewarray && code == Bytecodes::_multianewarray; |
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790 // Reexecute _multianewarray bytecode which was replaced with |
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791 // sequence of [a]newarray. See Parse::do_multianewarray(). |
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792 // |
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793 // Note: interpreter should not have it set since this optimization |
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794 // is limited by dimensions and guarded by flag so in some cases |
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795 // multianewarray() runtime calls will be generated and |
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796 // the bytecode should not be reexecutes (stack will not be reset). |
900
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797 } else |
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798 return false; |
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799 } |
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800 |
0 | 801 // Helper function for adding JVMState and debug information to node |
802 void GraphKit::add_safepoint_edges(SafePointNode* call, bool must_throw) { | |
803 // Add the safepoint edges to the call (or other safepoint). | |
804 | |
805 // Make sure dead locals are set to top. This | |
806 // should help register allocation time and cut down on the size | |
807 // of the deoptimization information. | |
808 assert(dead_locals_are_killed(), "garbage in debug info before safepoint"); | |
809 | |
810 // Walk the inline list to fill in the correct set of JVMState's | |
811 // Also fill in the associated edges for each JVMState. | |
812 | |
813 JVMState* youngest_jvms = sync_jvms(); | |
814 | |
815 // If we are guaranteed to throw, we can prune everything but the | |
816 // input to the current bytecode. | |
817 bool can_prune_locals = false; | |
818 uint stack_slots_not_pruned = 0; | |
819 int inputs = 0, depth = 0; | |
820 if (must_throw) { | |
821 assert(method() == youngest_jvms->method(), "sanity"); | |
822 if (compute_stack_effects(inputs, depth)) { | |
823 can_prune_locals = true; | |
824 stack_slots_not_pruned = inputs; | |
825 } | |
826 } | |
827 | |
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828 if (env()->jvmti_can_access_local_variables()) { |
0 | 829 // At any safepoint, this method can get breakpointed, which would |
830 // then require an immediate deoptimization. | |
831 can_prune_locals = false; // do not prune locals | |
832 stack_slots_not_pruned = 0; | |
833 } | |
834 | |
835 // do not scribble on the input jvms | |
836 JVMState* out_jvms = youngest_jvms->clone_deep(C); | |
837 call->set_jvms(out_jvms); // Start jvms list for call node | |
838 | |
900
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839 // For a known set of bytecodes, the interpreter should reexecute them if |
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840 // deoptimization happens. We set the reexecute state for them here |
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841 if (out_jvms->is_reexecute_undefined() && //don't change if already specified |
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842 should_reexecute_implied_by_bytecode(out_jvms, call->is_AllocateArray())) { |
900
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843 out_jvms->set_should_reexecute(true); //NOTE: youngest_jvms not changed |
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844 } |
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845 |
0 | 846 // Presize the call: |
847 debug_only(uint non_debug_edges = call->req()); | |
848 call->add_req_batch(top(), youngest_jvms->debug_depth()); | |
849 assert(call->req() == non_debug_edges + youngest_jvms->debug_depth(), ""); | |
850 | |
851 // Set up edges so that the call looks like this: | |
852 // Call [state:] ctl io mem fptr retadr | |
853 // [parms:] parm0 ... parmN | |
854 // [root:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN | |
855 // [...mid:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN [...] | |
856 // [young:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN | |
857 // Note that caller debug info precedes callee debug info. | |
858 | |
859 // Fill pointer walks backwards from "young:" to "root:" in the diagram above: | |
860 uint debug_ptr = call->req(); | |
861 | |
862 // Loop over the map input edges associated with jvms, add them | |
863 // to the call node, & reset all offsets to match call node array. | |
864 for (JVMState* in_jvms = youngest_jvms; in_jvms != NULL; ) { | |
865 uint debug_end = debug_ptr; | |
866 uint debug_start = debug_ptr - in_jvms->debug_size(); | |
867 debug_ptr = debug_start; // back up the ptr | |
868 | |
869 uint p = debug_start; // walks forward in [debug_start, debug_end) | |
870 uint j, k, l; | |
871 SafePointNode* in_map = in_jvms->map(); | |
872 out_jvms->set_map(call); | |
873 | |
874 if (can_prune_locals) { | |
875 assert(in_jvms->method() == out_jvms->method(), "sanity"); | |
876 // If the current throw can reach an exception handler in this JVMS, | |
877 // then we must keep everything live that can reach that handler. | |
878 // As a quick and dirty approximation, we look for any handlers at all. | |
879 if (in_jvms->method()->has_exception_handlers()) { | |
880 can_prune_locals = false; | |
881 } | |
882 } | |
883 | |
884 // Add the Locals | |
885 k = in_jvms->locoff(); | |
886 l = in_jvms->loc_size(); | |
887 out_jvms->set_locoff(p); | |
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888 if (!can_prune_locals) { |
0 | 889 for (j = 0; j < l; j++) |
890 call->set_req(p++, in_map->in(k+j)); | |
891 } else { | |
892 p += l; // already set to top above by add_req_batch | |
893 } | |
894 | |
895 // Add the Expression Stack | |
896 k = in_jvms->stkoff(); | |
897 l = in_jvms->sp(); | |
898 out_jvms->set_stkoff(p); | |
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899 if (!can_prune_locals) { |
0 | 900 for (j = 0; j < l; j++) |
901 call->set_req(p++, in_map->in(k+j)); | |
902 } else if (can_prune_locals && stack_slots_not_pruned != 0) { | |
903 // Divide stack into {S0,...,S1}, where S0 is set to top. | |
904 uint s1 = stack_slots_not_pruned; | |
905 stack_slots_not_pruned = 0; // for next iteration | |
906 if (s1 > l) s1 = l; | |
907 uint s0 = l - s1; | |
908 p += s0; // skip the tops preinstalled by add_req_batch | |
909 for (j = s0; j < l; j++) | |
910 call->set_req(p++, in_map->in(k+j)); | |
911 } else { | |
912 p += l; // already set to top above by add_req_batch | |
913 } | |
914 | |
915 // Add the Monitors | |
916 k = in_jvms->monoff(); | |
917 l = in_jvms->mon_size(); | |
918 out_jvms->set_monoff(p); | |
919 for (j = 0; j < l; j++) | |
920 call->set_req(p++, in_map->in(k+j)); | |
921 | |
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922 // Copy any scalar object fields. |
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923 k = in_jvms->scloff(); |
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924 l = in_jvms->scl_size(); |
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925 out_jvms->set_scloff(p); |
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926 for (j = 0; j < l; j++) |
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927 call->set_req(p++, in_map->in(k+j)); |
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928 |
0 | 929 // Finish the new jvms. |
930 out_jvms->set_endoff(p); | |
931 | |
932 assert(out_jvms->endoff() == debug_end, "fill ptr must match"); | |
933 assert(out_jvms->depth() == in_jvms->depth(), "depth must match"); | |
934 assert(out_jvms->loc_size() == in_jvms->loc_size(), "size must match"); | |
935 assert(out_jvms->mon_size() == in_jvms->mon_size(), "size must match"); | |
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936 assert(out_jvms->scl_size() == in_jvms->scl_size(), "size must match"); |
0 | 937 assert(out_jvms->debug_size() == in_jvms->debug_size(), "size must match"); |
938 | |
939 // Update the two tail pointers in parallel. | |
940 out_jvms = out_jvms->caller(); | |
941 in_jvms = in_jvms->caller(); | |
942 } | |
943 | |
944 assert(debug_ptr == non_debug_edges, "debug info must fit exactly"); | |
945 | |
946 // Test the correctness of JVMState::debug_xxx accessors: | |
947 assert(call->jvms()->debug_start() == non_debug_edges, ""); | |
948 assert(call->jvms()->debug_end() == call->req(), ""); | |
949 assert(call->jvms()->debug_depth() == call->req() - non_debug_edges, ""); | |
950 } | |
951 | |
952 bool GraphKit::compute_stack_effects(int& inputs, int& depth) { | |
953 Bytecodes::Code code = java_bc(); | |
954 if (code == Bytecodes::_wide) { | |
955 code = method()->java_code_at_bci(bci() + 1); | |
956 } | |
957 | |
958 BasicType rtype = T_ILLEGAL; | |
959 int rsize = 0; | |
960 | |
961 if (code != Bytecodes::_illegal) { | |
962 depth = Bytecodes::depth(code); // checkcast=0, athrow=-1 | |
963 rtype = Bytecodes::result_type(code); // checkcast=P, athrow=V | |
964 if (rtype < T_CONFLICT) | |
965 rsize = type2size[rtype]; | |
966 } | |
967 | |
968 switch (code) { | |
969 case Bytecodes::_illegal: | |
970 return false; | |
971 | |
972 case Bytecodes::_ldc: | |
973 case Bytecodes::_ldc_w: | |
974 case Bytecodes::_ldc2_w: | |
975 inputs = 0; | |
976 break; | |
977 | |
978 case Bytecodes::_dup: inputs = 1; break; | |
979 case Bytecodes::_dup_x1: inputs = 2; break; | |
980 case Bytecodes::_dup_x2: inputs = 3; break; | |
981 case Bytecodes::_dup2: inputs = 2; break; | |
982 case Bytecodes::_dup2_x1: inputs = 3; break; | |
983 case Bytecodes::_dup2_x2: inputs = 4; break; | |
984 case Bytecodes::_swap: inputs = 2; break; | |
985 case Bytecodes::_arraylength: inputs = 1; break; | |
986 | |
987 case Bytecodes::_getstatic: | |
988 case Bytecodes::_putstatic: | |
989 case Bytecodes::_getfield: | |
990 case Bytecodes::_putfield: | |
991 { | |
992 bool is_get = (depth >= 0), is_static = (depth & 1); | |
993 bool ignore; | |
994 ciBytecodeStream iter(method()); | |
995 iter.reset_to_bci(bci()); | |
996 iter.next(); | |
997 ciField* field = iter.get_field(ignore); | |
998 int size = field->type()->size(); | |
999 inputs = (is_static ? 0 : 1); | |
1000 if (is_get) { | |
1001 depth = size - inputs; | |
1002 } else { | |
1003 inputs += size; // putxxx pops the value from the stack | |
1004 depth = - inputs; | |
1005 } | |
1006 } | |
1007 break; | |
1008 | |
1009 case Bytecodes::_invokevirtual: | |
1010 case Bytecodes::_invokespecial: | |
1011 case Bytecodes::_invokestatic: | |
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1012 case Bytecodes::_invokedynamic: |
0 | 1013 case Bytecodes::_invokeinterface: |
1014 { | |
1015 bool ignore; | |
1016 ciBytecodeStream iter(method()); | |
1017 iter.reset_to_bci(bci()); | |
1018 iter.next(); | |
1019 ciMethod* method = iter.get_method(ignore); | |
1020 inputs = method->arg_size_no_receiver(); | |
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1021 // Add a receiver argument, maybe: |
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1022 if (code != Bytecodes::_invokestatic && |
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1023 code != Bytecodes::_invokedynamic) |
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1024 inputs += 1; |
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1025 // (Do not use ciMethod::arg_size(), because |
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1026 // it might be an unloaded method, which doesn't |
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1027 // know whether it is static or not.) |
0 | 1028 int size = method->return_type()->size(); |
1029 depth = size - inputs; | |
1030 } | |
1031 break; | |
1032 | |
1033 case Bytecodes::_multianewarray: | |
1034 { | |
1035 ciBytecodeStream iter(method()); | |
1036 iter.reset_to_bci(bci()); | |
1037 iter.next(); | |
1038 inputs = iter.get_dimensions(); | |
1039 assert(rsize == 1, ""); | |
1040 depth = rsize - inputs; | |
1041 } | |
1042 break; | |
1043 | |
1044 case Bytecodes::_ireturn: | |
1045 case Bytecodes::_lreturn: | |
1046 case Bytecodes::_freturn: | |
1047 case Bytecodes::_dreturn: | |
1048 case Bytecodes::_areturn: | |
1049 assert(rsize = -depth, ""); | |
1050 inputs = rsize; | |
1051 break; | |
1052 | |
1053 case Bytecodes::_jsr: | |
1054 case Bytecodes::_jsr_w: | |
1055 inputs = 0; | |
1056 depth = 1; // S.B. depth=1, not zero | |
1057 break; | |
1058 | |
1059 default: | |
1060 // bytecode produces a typed result | |
1061 inputs = rsize - depth; | |
1062 assert(inputs >= 0, ""); | |
1063 break; | |
1064 } | |
1065 | |
1066 #ifdef ASSERT | |
1067 // spot check | |
1068 int outputs = depth + inputs; | |
1069 assert(outputs >= 0, "sanity"); | |
1070 switch (code) { | |
1071 case Bytecodes::_checkcast: assert(inputs == 1 && outputs == 1, ""); break; | |
1072 case Bytecodes::_athrow: assert(inputs == 1 && outputs == 0, ""); break; | |
1073 case Bytecodes::_aload_0: assert(inputs == 0 && outputs == 1, ""); break; | |
1074 case Bytecodes::_return: assert(inputs == 0 && outputs == 0, ""); break; | |
1075 case Bytecodes::_drem: assert(inputs == 4 && outputs == 2, ""); break; | |
1076 } | |
1077 #endif //ASSERT | |
1078 | |
1079 return true; | |
1080 } | |
1081 | |
1082 | |
1083 | |
1084 //------------------------------basic_plus_adr--------------------------------- | |
1085 Node* GraphKit::basic_plus_adr(Node* base, Node* ptr, Node* offset) { | |
1086 // short-circuit a common case | |
1087 if (offset == intcon(0)) return ptr; | |
1088 return _gvn.transform( new (C, 4) AddPNode(base, ptr, offset) ); | |
1089 } | |
1090 | |
1091 Node* GraphKit::ConvI2L(Node* offset) { | |
1092 // short-circuit a common case | |
1093 jint offset_con = find_int_con(offset, Type::OffsetBot); | |
1094 if (offset_con != Type::OffsetBot) { | |
1095 return longcon((long) offset_con); | |
1096 } | |
1097 return _gvn.transform( new (C, 2) ConvI2LNode(offset)); | |
1098 } | |
1099 Node* GraphKit::ConvL2I(Node* offset) { | |
1100 // short-circuit a common case | |
1101 jlong offset_con = find_long_con(offset, (jlong)Type::OffsetBot); | |
1102 if (offset_con != (jlong)Type::OffsetBot) { | |
1103 return intcon((int) offset_con); | |
1104 } | |
1105 return _gvn.transform( new (C, 2) ConvL2INode(offset)); | |
1106 } | |
1107 | |
1108 //-------------------------load_object_klass----------------------------------- | |
1109 Node* GraphKit::load_object_klass(Node* obj) { | |
1110 // Special-case a fresh allocation to avoid building nodes: | |
1111 Node* akls = AllocateNode::Ideal_klass(obj, &_gvn); | |
1112 if (akls != NULL) return akls; | |
1113 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes()); | |
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1114 return _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), k_adr, TypeInstPtr::KLASS) ); |
0 | 1115 } |
1116 | |
1117 //-------------------------load_array_length----------------------------------- | |
1118 Node* GraphKit::load_array_length(Node* array) { | |
1119 // Special-case a fresh allocation to avoid building nodes: | |
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1120 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(array, &_gvn); |
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1121 Node *alen; |
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1122 if (alloc == NULL) { |
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1123 Node *r_adr = basic_plus_adr(array, arrayOopDesc::length_offset_in_bytes()); |
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1124 alen = _gvn.transform( new (C, 3) LoadRangeNode(0, immutable_memory(), r_adr, TypeInt::POS)); |
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1125 } else { |
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1126 alen = alloc->Ideal_length(); |
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1127 Node* ccast = alloc->make_ideal_length(_gvn.type(array)->is_oopptr(), &_gvn); |
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1128 if (ccast != alen) { |
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1129 alen = _gvn.transform(ccast); |
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1130 } |
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1131 } |
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1132 return alen; |
0 | 1133 } |
1134 | |
1135 //------------------------------do_null_check---------------------------------- | |
1136 // Helper function to do a NULL pointer check. Returned value is | |
1137 // the incoming address with NULL casted away. You are allowed to use the | |
1138 // not-null value only if you are control dependent on the test. | |
1139 extern int explicit_null_checks_inserted, | |
1140 explicit_null_checks_elided; | |
1141 Node* GraphKit::null_check_common(Node* value, BasicType type, | |
1142 // optional arguments for variations: | |
1143 bool assert_null, | |
1144 Node* *null_control) { | |
1145 assert(!assert_null || null_control == NULL, "not both at once"); | |
1146 if (stopped()) return top(); | |
1147 if (!GenerateCompilerNullChecks && !assert_null && null_control == NULL) { | |
1148 // For some performance testing, we may wish to suppress null checking. | |
1149 value = cast_not_null(value); // Make it appear to be non-null (4962416). | |
1150 return value; | |
1151 } | |
1152 explicit_null_checks_inserted++; | |
1153 | |
1154 // Construct NULL check | |
1155 Node *chk = NULL; | |
1156 switch(type) { | |
1157 case T_LONG : chk = new (C, 3) CmpLNode(value, _gvn.zerocon(T_LONG)); break; | |
1158 case T_INT : chk = new (C, 3) CmpINode( value, _gvn.intcon(0)); break; | |
1159 case T_ARRAY : // fall through | |
1160 type = T_OBJECT; // simplify further tests | |
1161 case T_OBJECT : { | |
1162 const Type *t = _gvn.type( value ); | |
1163 | |
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1164 const TypeOopPtr* tp = t->isa_oopptr(); |
955 | 1165 if (tp != NULL && tp->klass() != NULL && !tp->klass()->is_loaded() |
0 | 1166 // Only for do_null_check, not any of its siblings: |
1167 && !assert_null && null_control == NULL) { | |
1168 // Usually, any field access or invocation on an unloaded oop type | |
1169 // will simply fail to link, since the statically linked class is | |
1170 // likely also to be unloaded. However, in -Xcomp mode, sometimes | |
1171 // the static class is loaded but the sharper oop type is not. | |
1172 // Rather than checking for this obscure case in lots of places, | |
1173 // we simply observe that a null check on an unloaded class | |
1174 // will always be followed by a nonsense operation, so we | |
1175 // can just issue the uncommon trap here. | |
1176 // Our access to the unloaded class will only be correct | |
1177 // after it has been loaded and initialized, which requires | |
1178 // a trip through the interpreter. | |
1179 #ifndef PRODUCT | |
1180 if (WizardMode) { tty->print("Null check of unloaded "); tp->klass()->print(); tty->cr(); } | |
1181 #endif | |
1182 uncommon_trap(Deoptimization::Reason_unloaded, | |
1183 Deoptimization::Action_reinterpret, | |
1184 tp->klass(), "!loaded"); | |
1185 return top(); | |
1186 } | |
1187 | |
1188 if (assert_null) { | |
1189 // See if the type is contained in NULL_PTR. | |
1190 // If so, then the value is already null. | |
1191 if (t->higher_equal(TypePtr::NULL_PTR)) { | |
1192 explicit_null_checks_elided++; | |
1193 return value; // Elided null assert quickly! | |
1194 } | |
1195 } else { | |
1196 // See if mixing in the NULL pointer changes type. | |
1197 // If so, then the NULL pointer was not allowed in the original | |
1198 // type. In other words, "value" was not-null. | |
1199 if (t->meet(TypePtr::NULL_PTR) != t) { | |
1200 // same as: if (!TypePtr::NULL_PTR->higher_equal(t)) ... | |
1201 explicit_null_checks_elided++; | |
1202 return value; // Elided null check quickly! | |
1203 } | |
1204 } | |
1205 chk = new (C, 3) CmpPNode( value, null() ); | |
1206 break; | |
1207 } | |
1208 | |
1209 default : ShouldNotReachHere(); | |
1210 } | |
1211 assert(chk != NULL, "sanity check"); | |
1212 chk = _gvn.transform(chk); | |
1213 | |
1214 BoolTest::mask btest = assert_null ? BoolTest::eq : BoolTest::ne; | |
1215 BoolNode *btst = new (C, 2) BoolNode( chk, btest); | |
1216 Node *tst = _gvn.transform( btst ); | |
1217 | |
1218 //----------- | |
605 | 1219 // if peephole optimizations occurred, a prior test existed. |
0 | 1220 // If a prior test existed, maybe it dominates as we can avoid this test. |
1221 if (tst != btst && type == T_OBJECT) { | |
1222 // At this point we want to scan up the CFG to see if we can | |
1223 // find an identical test (and so avoid this test altogether). | |
1224 Node *cfg = control(); | |
1225 int depth = 0; | |
1226 while( depth < 16 ) { // Limit search depth for speed | |
1227 if( cfg->Opcode() == Op_IfTrue && | |
1228 cfg->in(0)->in(1) == tst ) { | |
1229 // Found prior test. Use "cast_not_null" to construct an identical | |
1230 // CastPP (and hence hash to) as already exists for the prior test. | |
1231 // Return that casted value. | |
1232 if (assert_null) { | |
1233 replace_in_map(value, null()); | |
1234 return null(); // do not issue the redundant test | |
1235 } | |
1236 Node *oldcontrol = control(); | |
1237 set_control(cfg); | |
1238 Node *res = cast_not_null(value); | |
1239 set_control(oldcontrol); | |
1240 explicit_null_checks_elided++; | |
1241 return res; | |
1242 } | |
1243 cfg = IfNode::up_one_dom(cfg, /*linear_only=*/ true); | |
1244 if (cfg == NULL) break; // Quit at region nodes | |
1245 depth++; | |
1246 } | |
1247 } | |
1248 | |
1249 //----------- | |
1250 // Branch to failure if null | |
1251 float ok_prob = PROB_MAX; // a priori estimate: nulls never happen | |
1252 Deoptimization::DeoptReason reason; | |
1253 if (assert_null) | |
1254 reason = Deoptimization::Reason_null_assert; | |
1255 else if (type == T_OBJECT) | |
1256 reason = Deoptimization::Reason_null_check; | |
1257 else | |
1258 reason = Deoptimization::Reason_div0_check; | |
1259 | |
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1260 // %%% Since Reason_unhandled is not recorded on a per-bytecode basis, |
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1261 // ciMethodData::has_trap_at will return a conservative -1 if any |
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1262 // must-be-null assertion has failed. This could cause performance |
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1263 // problems for a method after its first do_null_assert failure. |
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1264 // Consider using 'Reason_class_check' instead? |
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1265 |
0 | 1266 // To cause an implicit null check, we set the not-null probability |
605 | 1267 // to the maximum (PROB_MAX). For an explicit check the probability |
0 | 1268 // is set to a smaller value. |
1269 if (null_control != NULL || too_many_traps(reason)) { | |
1270 // probability is less likely | |
1271 ok_prob = PROB_LIKELY_MAG(3); | |
1272 } else if (!assert_null && | |
1273 (ImplicitNullCheckThreshold > 0) && | |
1274 method() != NULL && | |
1275 (method()->method_data()->trap_count(reason) | |
1276 >= (uint)ImplicitNullCheckThreshold)) { | |
1277 ok_prob = PROB_LIKELY_MAG(3); | |
1278 } | |
1279 | |
1280 if (null_control != NULL) { | |
1281 IfNode* iff = create_and_map_if(control(), tst, ok_prob, COUNT_UNKNOWN); | |
1282 Node* null_true = _gvn.transform( new (C, 1) IfFalseNode(iff)); | |
1283 set_control( _gvn.transform( new (C, 1) IfTrueNode(iff))); | |
1284 if (null_true == top()) | |
1285 explicit_null_checks_elided++; | |
1286 (*null_control) = null_true; | |
1287 } else { | |
1288 BuildCutout unless(this, tst, ok_prob); | |
1289 // Check for optimizer eliding test at parse time | |
1290 if (stopped()) { | |
1291 // Failure not possible; do not bother making uncommon trap. | |
1292 explicit_null_checks_elided++; | |
1293 } else if (assert_null) { | |
1294 uncommon_trap(reason, | |
1295 Deoptimization::Action_make_not_entrant, | |
1296 NULL, "assert_null"); | |
1297 } else { | |
332 | 1298 replace_in_map(value, zerocon(type)); |
0 | 1299 builtin_throw(reason); |
1300 } | |
1301 } | |
1302 | |
1303 // Must throw exception, fall-thru not possible? | |
1304 if (stopped()) { | |
1305 return top(); // No result | |
1306 } | |
1307 | |
1308 if (assert_null) { | |
1309 // Cast obj to null on this path. | |
1310 replace_in_map(value, zerocon(type)); | |
1311 return zerocon(type); | |
1312 } | |
1313 | |
1314 // Cast obj to not-null on this path, if there is no null_control. | |
1315 // (If there is a null_control, a non-null value may come back to haunt us.) | |
1316 if (type == T_OBJECT) { | |
1317 Node* cast = cast_not_null(value, false); | |
1318 if (null_control == NULL || (*null_control) == top()) | |
1319 replace_in_map(value, cast); | |
1320 value = cast; | |
1321 } | |
1322 | |
1323 return value; | |
1324 } | |
1325 | |
1326 | |
1327 //------------------------------cast_not_null---------------------------------- | |
1328 // Cast obj to not-null on this path | |
1329 Node* GraphKit::cast_not_null(Node* obj, bool do_replace_in_map) { | |
1330 const Type *t = _gvn.type(obj); | |
1331 const Type *t_not_null = t->join(TypePtr::NOTNULL); | |
1332 // Object is already not-null? | |
1333 if( t == t_not_null ) return obj; | |
1334 | |
1335 Node *cast = new (C, 2) CastPPNode(obj,t_not_null); | |
1336 cast->init_req(0, control()); | |
1337 cast = _gvn.transform( cast ); | |
1338 | |
1339 // Scan for instances of 'obj' in the current JVM mapping. | |
1340 // These instances are known to be not-null after the test. | |
1341 if (do_replace_in_map) | |
1342 replace_in_map(obj, cast); | |
1343 | |
1344 return cast; // Return casted value | |
1345 } | |
1346 | |
1347 | |
1348 //--------------------------replace_in_map------------------------------------- | |
1349 void GraphKit::replace_in_map(Node* old, Node* neww) { | |
1350 this->map()->replace_edge(old, neww); | |
1351 | |
1352 // Note: This operation potentially replaces any edge | |
1353 // on the map. This includes locals, stack, and monitors | |
1354 // of the current (innermost) JVM state. | |
1355 | |
1356 // We can consider replacing in caller maps. | |
1357 // The idea would be that an inlined function's null checks | |
1358 // can be shared with the entire inlining tree. | |
1359 // The expense of doing this is that the PreserveJVMState class | |
1360 // would have to preserve caller states too, with a deep copy. | |
1361 } | |
1362 | |
1363 | |
1364 | |
1365 //============================================================================= | |
1366 //--------------------------------memory--------------------------------------- | |
1367 Node* GraphKit::memory(uint alias_idx) { | |
1368 MergeMemNode* mem = merged_memory(); | |
1369 Node* p = mem->memory_at(alias_idx); | |
1370 _gvn.set_type(p, Type::MEMORY); // must be mapped | |
1371 return p; | |
1372 } | |
1373 | |
1374 //-----------------------------reset_memory------------------------------------ | |
1375 Node* GraphKit::reset_memory() { | |
1376 Node* mem = map()->memory(); | |
1377 // do not use this node for any more parsing! | |
1378 debug_only( map()->set_memory((Node*)NULL) ); | |
1379 return _gvn.transform( mem ); | |
1380 } | |
1381 | |
1382 //------------------------------set_all_memory--------------------------------- | |
1383 void GraphKit::set_all_memory(Node* newmem) { | |
1384 Node* mergemem = MergeMemNode::make(C, newmem); | |
1385 gvn().set_type_bottom(mergemem); | |
1386 map()->set_memory(mergemem); | |
1387 } | |
1388 | |
1389 //------------------------------set_all_memory_call---------------------------- | |
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1390 void GraphKit::set_all_memory_call(Node* call, bool separate_io_proj) { |
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1391 Node* newmem = _gvn.transform( new (C, 1) ProjNode(call, TypeFunc::Memory, separate_io_proj) ); |
0 | 1392 set_all_memory(newmem); |
1393 } | |
1394 | |
1395 //============================================================================= | |
1396 // | |
1397 // parser factory methods for MemNodes | |
1398 // | |
1399 // These are layered on top of the factory methods in LoadNode and StoreNode, | |
1400 // and integrate with the parser's memory state and _gvn engine. | |
1401 // | |
1402 | |
1403 // factory methods in "int adr_idx" | |
1404 Node* GraphKit::make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, | |
1405 int adr_idx, | |
1406 bool require_atomic_access) { | |
1407 assert(adr_idx != Compile::AliasIdxTop, "use other make_load factory" ); | |
1408 const TypePtr* adr_type = NULL; // debug-mode-only argument | |
1409 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
1410 Node* mem = memory(adr_idx); | |
1411 Node* ld; | |
1412 if (require_atomic_access && bt == T_LONG) { | |
1413 ld = LoadLNode::make_atomic(C, ctl, mem, adr, adr_type, t); | |
1414 } else { | |
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1415 ld = LoadNode::make(_gvn, ctl, mem, adr, adr_type, t, bt); |
0 | 1416 } |
1417 return _gvn.transform(ld); | |
1418 } | |
1419 | |
1420 Node* GraphKit::store_to_memory(Node* ctl, Node* adr, Node *val, BasicType bt, | |
1421 int adr_idx, | |
1422 bool require_atomic_access) { | |
1423 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); | |
1424 const TypePtr* adr_type = NULL; | |
1425 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
1426 Node *mem = memory(adr_idx); | |
1427 Node* st; | |
1428 if (require_atomic_access && bt == T_LONG) { | |
1429 st = StoreLNode::make_atomic(C, ctl, mem, adr, adr_type, val); | |
1430 } else { | |
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1431 st = StoreNode::make(_gvn, ctl, mem, adr, adr_type, val, bt); |
0 | 1432 } |
1433 st = _gvn.transform(st); | |
1434 set_memory(st, adr_idx); | |
1435 // Back-to-back stores can only remove intermediate store with DU info | |
1436 // so push on worklist for optimizer. | |
1437 if (mem->req() > MemNode::Address && adr == mem->in(MemNode::Address)) | |
1438 record_for_igvn(st); | |
1439 | |
1440 return st; | |
1441 } | |
1442 | |
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1443 |
0 | 1444 void GraphKit::pre_barrier(Node* ctl, |
1445 Node* obj, | |
1446 Node* adr, | |
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1447 uint adr_idx, |
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1448 Node* val, |
825 | 1449 const TypeOopPtr* val_type, |
0 | 1450 BasicType bt) { |
1451 BarrierSet* bs = Universe::heap()->barrier_set(); | |
1452 set_control(ctl); | |
1453 switch (bs->kind()) { | |
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1454 case BarrierSet::G1SATBCT: |
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1455 case BarrierSet::G1SATBCTLogging: |
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1456 g1_write_barrier_pre(obj, adr, adr_idx, val, val_type, bt); |
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1457 break; |
0 | 1458 |
1459 case BarrierSet::CardTableModRef: | |
1460 case BarrierSet::CardTableExtension: | |
1461 case BarrierSet::ModRef: | |
1462 break; | |
1463 | |
1464 case BarrierSet::Other: | |
1465 default : | |
1466 ShouldNotReachHere(); | |
1467 | |
1468 } | |
1469 } | |
1470 | |
1471 void GraphKit::post_barrier(Node* ctl, | |
1472 Node* store, | |
1473 Node* obj, | |
1474 Node* adr, | |
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1475 uint adr_idx, |
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1476 Node* val, |
0 | 1477 BasicType bt, |
1478 bool use_precise) { | |
1479 BarrierSet* bs = Universe::heap()->barrier_set(); | |
1480 set_control(ctl); | |
1481 switch (bs->kind()) { | |
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1482 case BarrierSet::G1SATBCT: |
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1483 case BarrierSet::G1SATBCTLogging: |
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1484 g1_write_barrier_post(store, obj, adr, adr_idx, val, bt, use_precise); |
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1485 break; |
0 | 1486 |
1487 case BarrierSet::CardTableModRef: | |
1488 case BarrierSet::CardTableExtension: | |
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1489 write_barrier_post(store, obj, adr, adr_idx, val, use_precise); |
0 | 1490 break; |
1491 | |
1492 case BarrierSet::ModRef: | |
1493 break; | |
1494 | |
1495 case BarrierSet::Other: | |
1496 default : | |
1497 ShouldNotReachHere(); | |
1498 | |
1499 } | |
1500 } | |
1501 | |
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1502 Node* GraphKit::store_oop(Node* ctl, |
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1503 Node* obj, |
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1504 Node* adr, |
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1505 const TypePtr* adr_type, |
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1506 Node* val, |
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1507 const TypeOopPtr* val_type, |
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1508 BasicType bt, |
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1509 bool use_precise) { |
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1510 |
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1511 set_control(ctl); |
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1512 if (stopped()) return top(); // Dead path ? |
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1513 |
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1514 assert(bt == T_OBJECT, "sanity"); |
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1515 assert(val != NULL, "not dead path"); |
0 | 1516 uint adr_idx = C->get_alias_index(adr_type); |
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1517 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); |
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1518 |
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1519 pre_barrier(control(), obj, adr, adr_idx, val, val_type, bt); |
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1520 Node* store = store_to_memory(control(), adr, val, bt, adr_idx); |
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1521 post_barrier(control(), store, obj, adr, adr_idx, val, bt, use_precise); |
0 | 1522 return store; |
1523 } | |
1524 | |
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1525 // Could be an array or object we don't know at compile time (unsafe ref.) |
0 | 1526 Node* GraphKit::store_oop_to_unknown(Node* ctl, |
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1527 Node* obj, // containing obj |
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1528 Node* adr, // actual adress to store val at |
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1529 const TypePtr* adr_type, |
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1530 Node* val, |
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1531 BasicType bt) { |
825 | 1532 Compile::AliasType* at = C->alias_type(adr_type); |
1533 const TypeOopPtr* val_type = NULL; | |
1534 if (adr_type->isa_instptr()) { | |
1535 if (at->field() != NULL) { | |
1536 // known field. This code is a copy of the do_put_xxx logic. | |
1537 ciField* field = at->field(); | |
1538 if (!field->type()->is_loaded()) { | |
1539 val_type = TypeInstPtr::BOTTOM; | |
1540 } else { | |
1541 val_type = TypeOopPtr::make_from_klass(field->type()->as_klass()); | |
1542 } | |
1543 } | |
1544 } else if (adr_type->isa_aryptr()) { | |
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1545 val_type = adr_type->is_aryptr()->elem()->make_oopptr(); |
825 | 1546 } |
1547 if (val_type == NULL) { | |
1548 val_type = TypeInstPtr::BOTTOM; | |
1549 } | |
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1550 return store_oop(ctl, obj, adr, adr_type, val, val_type, bt, true); |
0 | 1551 } |
1552 | |
1553 | |
1554 //-------------------------array_element_address------------------------- | |
1555 Node* GraphKit::array_element_address(Node* ary, Node* idx, BasicType elembt, | |
1556 const TypeInt* sizetype) { | |
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1557 uint shift = exact_log2(type2aelembytes(elembt)); |
0 | 1558 uint header = arrayOopDesc::base_offset_in_bytes(elembt); |
1559 | |
1560 // short-circuit a common case (saves lots of confusing waste motion) | |
1561 jint idx_con = find_int_con(idx, -1); | |
1562 if (idx_con >= 0) { | |
1563 intptr_t offset = header + ((intptr_t)idx_con << shift); | |
1564 return basic_plus_adr(ary, offset); | |
1565 } | |
1566 | |
1567 // must be correct type for alignment purposes | |
1568 Node* base = basic_plus_adr(ary, header); | |
1569 #ifdef _LP64 | |
1570 // The scaled index operand to AddP must be a clean 64-bit value. | |
1571 // Java allows a 32-bit int to be incremented to a negative | |
1572 // value, which appears in a 64-bit register as a large | |
1573 // positive number. Using that large positive number as an | |
1574 // operand in pointer arithmetic has bad consequences. | |
1575 // On the other hand, 32-bit overflow is rare, and the possibility | |
1576 // can often be excluded, if we annotate the ConvI2L node with | |
1577 // a type assertion that its value is known to be a small positive | |
1578 // number. (The prior range check has ensured this.) | |
1579 // This assertion is used by ConvI2LNode::Ideal. | |
1580 int index_max = max_jint - 1; // array size is max_jint, index is one less | |
1581 if (sizetype != NULL) index_max = sizetype->_hi - 1; | |
1582 const TypeLong* lidxtype = TypeLong::make(CONST64(0), index_max, Type::WidenMax); | |
1583 idx = _gvn.transform( new (C, 2) ConvI2LNode(idx, lidxtype) ); | |
1584 #endif | |
1585 Node* scale = _gvn.transform( new (C, 3) LShiftXNode(idx, intcon(shift)) ); | |
1586 return basic_plus_adr(ary, base, scale); | |
1587 } | |
1588 | |
1589 //-------------------------load_array_element------------------------- | |
1590 Node* GraphKit::load_array_element(Node* ctl, Node* ary, Node* idx, const TypeAryPtr* arytype) { | |
1591 const Type* elemtype = arytype->elem(); | |
1592 BasicType elembt = elemtype->array_element_basic_type(); | |
1593 Node* adr = array_element_address(ary, idx, elembt, arytype->size()); | |
1594 Node* ld = make_load(ctl, adr, elemtype, elembt, arytype); | |
1595 return ld; | |
1596 } | |
1597 | |
1598 //-------------------------set_arguments_for_java_call------------------------- | |
1599 // Arguments (pre-popped from the stack) are taken from the JVMS. | |
1600 void GraphKit::set_arguments_for_java_call(CallJavaNode* call) { | |
1601 // Add the call arguments: | |
1602 uint nargs = call->method()->arg_size(); | |
1603 for (uint i = 0; i < nargs; i++) { | |
1604 Node* arg = argument(i); | |
1605 call->init_req(i + TypeFunc::Parms, arg); | |
1606 } | |
1607 } | |
1608 | |
1609 //---------------------------set_edges_for_java_call--------------------------- | |
1610 // Connect a newly created call into the current JVMS. | |
1611 // A return value node (if any) is returned from set_edges_for_java_call. | |
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1612 void GraphKit::set_edges_for_java_call(CallJavaNode* call, bool must_throw, bool separate_io_proj) { |
0 | 1613 |
1614 // Add the predefined inputs: | |
1615 call->init_req( TypeFunc::Control, control() ); | |
1616 call->init_req( TypeFunc::I_O , i_o() ); | |
1617 call->init_req( TypeFunc::Memory , reset_memory() ); | |
1618 call->init_req( TypeFunc::FramePtr, frameptr() ); | |
1619 call->init_req( TypeFunc::ReturnAdr, top() ); | |
1620 | |
1621 add_safepoint_edges(call, must_throw); | |
1622 | |
1623 Node* xcall = _gvn.transform(call); | |
1624 | |
1625 if (xcall == top()) { | |
1626 set_control(top()); | |
1627 return; | |
1628 } | |
1629 assert(xcall == call, "call identity is stable"); | |
1630 | |
1631 // Re-use the current map to produce the result. | |
1632 | |
1633 set_control(_gvn.transform(new (C, 1) ProjNode(call, TypeFunc::Control))); | |
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1634 set_i_o( _gvn.transform(new (C, 1) ProjNode(call, TypeFunc::I_O , separate_io_proj))); |
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1635 set_all_memory_call(xcall, separate_io_proj); |
0 | 1636 |
1637 //return xcall; // no need, caller already has it | |
1638 } | |
1639 | |
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1640 Node* GraphKit::set_results_for_java_call(CallJavaNode* call, bool separate_io_proj) { |
0 | 1641 if (stopped()) return top(); // maybe the call folded up? |
1642 | |
1643 // Capture the return value, if any. | |
1644 Node* ret; | |
1645 if (call->method() == NULL || | |
1646 call->method()->return_type()->basic_type() == T_VOID) | |
1647 ret = top(); | |
1648 else ret = _gvn.transform(new (C, 1) ProjNode(call, TypeFunc::Parms)); | |
1649 | |
1650 // Note: Since any out-of-line call can produce an exception, | |
1651 // we always insert an I_O projection from the call into the result. | |
1652 | |
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1653 make_slow_call_ex(call, env()->Throwable_klass(), separate_io_proj); |
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1654 |
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1655 if (separate_io_proj) { |
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1656 // The caller requested separate projections be used by the fall |
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1657 // through and exceptional paths, so replace the projections for |
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1658 // the fall through path. |
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1659 set_i_o(_gvn.transform( new (C, 1) ProjNode(call, TypeFunc::I_O) )); |
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1660 set_all_memory(_gvn.transform( new (C, 1) ProjNode(call, TypeFunc::Memory) )); |
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1661 } |
0 | 1662 return ret; |
1663 } | |
1664 | |
1665 //--------------------set_predefined_input_for_runtime_call-------------------- | |
1666 // Reading and setting the memory state is way conservative here. | |
1667 // The real problem is that I am not doing real Type analysis on memory, | |
1668 // so I cannot distinguish card mark stores from other stores. Across a GC | |
1669 // point the Store Barrier and the card mark memory has to agree. I cannot | |
1670 // have a card mark store and its barrier split across the GC point from | |
1671 // either above or below. Here I get that to happen by reading ALL of memory. | |
1672 // A better answer would be to separate out card marks from other memory. | |
1673 // For now, return the input memory state, so that it can be reused | |
1674 // after the call, if this call has restricted memory effects. | |
1675 Node* GraphKit::set_predefined_input_for_runtime_call(SafePointNode* call) { | |
1676 // Set fixed predefined input arguments | |
1677 Node* memory = reset_memory(); | |
1678 call->init_req( TypeFunc::Control, control() ); | |
1679 call->init_req( TypeFunc::I_O, top() ); // does no i/o | |
1680 call->init_req( TypeFunc::Memory, memory ); // may gc ptrs | |
1681 call->init_req( TypeFunc::FramePtr, frameptr() ); | |
1682 call->init_req( TypeFunc::ReturnAdr, top() ); | |
1683 return memory; | |
1684 } | |
1685 | |
1686 //-------------------set_predefined_output_for_runtime_call-------------------- | |
1687 // Set control and memory (not i_o) from the call. | |
1688 // If keep_mem is not NULL, use it for the output state, | |
1689 // except for the RawPtr output of the call, if hook_mem is TypeRawPtr::BOTTOM. | |
1690 // If hook_mem is NULL, this call produces no memory effects at all. | |
1691 // If hook_mem is a Java-visible memory slice (such as arraycopy operands), | |
1692 // then only that memory slice is taken from the call. | |
1693 // In the last case, we must put an appropriate memory barrier before | |
1694 // the call, so as to create the correct anti-dependencies on loads | |
1695 // preceding the call. | |
1696 void GraphKit::set_predefined_output_for_runtime_call(Node* call, | |
1697 Node* keep_mem, | |
1698 const TypePtr* hook_mem) { | |
1699 // no i/o | |
1700 set_control(_gvn.transform( new (C, 1) ProjNode(call,TypeFunc::Control) )); | |
1701 if (keep_mem) { | |
1702 // First clone the existing memory state | |
1703 set_all_memory(keep_mem); | |
1704 if (hook_mem != NULL) { | |
1705 // Make memory for the call | |
1706 Node* mem = _gvn.transform( new (C, 1) ProjNode(call, TypeFunc::Memory) ); | |
1707 // Set the RawPtr memory state only. This covers all the heap top/GC stuff | |
1708 // We also use hook_mem to extract specific effects from arraycopy stubs. | |
1709 set_memory(mem, hook_mem); | |
1710 } | |
1711 // ...else the call has NO memory effects. | |
1712 | |
1713 // Make sure the call advertises its memory effects precisely. | |
1714 // This lets us build accurate anti-dependences in gcm.cpp. | |
1715 assert(C->alias_type(call->adr_type()) == C->alias_type(hook_mem), | |
1716 "call node must be constructed correctly"); | |
1717 } else { | |
1718 assert(hook_mem == NULL, ""); | |
1719 // This is not a "slow path" call; all memory comes from the call. | |
1720 set_all_memory_call(call); | |
1721 } | |
1722 } | |
1723 | |
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1724 |
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1725 // Replace the call with the current state of the kit. |
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1726 void GraphKit::replace_call(CallNode* call, Node* result) { |
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1727 JVMState* ejvms = NULL; |
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1728 if (has_exceptions()) { |
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1729 ejvms = transfer_exceptions_into_jvms(); |
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1730 } |
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1731 |
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1732 SafePointNode* final_state = stop(); |
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1733 |
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1734 // Find all the needed outputs of this call |
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1735 CallProjections callprojs; |
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1736 call->extract_projections(&callprojs, true); |
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1737 |
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1738 // Replace all the old call edges with the edges from the inlining result |
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1739 C->gvn_replace_by(callprojs.fallthrough_catchproj, final_state->in(TypeFunc::Control)); |
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1740 C->gvn_replace_by(callprojs.fallthrough_memproj, final_state->in(TypeFunc::Memory)); |
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1741 C->gvn_replace_by(callprojs.fallthrough_ioproj, final_state->in(TypeFunc::I_O)); |
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1742 |
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1743 // Replace the result with the new result if it exists and is used |
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1744 if (callprojs.resproj != NULL && result != NULL) { |
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1745 C->gvn_replace_by(callprojs.resproj, result); |
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1746 } |
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1747 |
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1748 if (ejvms == NULL) { |
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1749 // No exception edges to simply kill off those paths |
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1750 C->gvn_replace_by(callprojs.catchall_catchproj, C->top()); |
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1751 C->gvn_replace_by(callprojs.catchall_memproj, C->top()); |
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1752 C->gvn_replace_by(callprojs.catchall_ioproj, C->top()); |
1099
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1753 |
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1754 // Replace the old exception object with top |
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1755 if (callprojs.exobj != NULL) { |
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1756 C->gvn_replace_by(callprojs.exobj, C->top()); |
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1757 } |
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1758 } else { |
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1759 GraphKit ekit(ejvms); |
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1760 |
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1761 // Load my combined exception state into the kit, with all phis transformed: |
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1762 SafePointNode* ex_map = ekit.combine_and_pop_all_exception_states(); |
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1763 |
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1764 Node* ex_oop = ekit.use_exception_state(ex_map); |
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1765 |
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1766 C->gvn_replace_by(callprojs.catchall_catchproj, ekit.control()); |
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1767 C->gvn_replace_by(callprojs.catchall_memproj, ekit.reset_memory()); |
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1768 C->gvn_replace_by(callprojs.catchall_ioproj, ekit.i_o()); |
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1769 |
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1770 // Replace the old exception object with the newly created one |
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1771 if (callprojs.exobj != NULL) { |
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1772 C->gvn_replace_by(callprojs.exobj, ex_oop); |
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1773 } |
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1774 } |
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1775 |
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1776 // Disconnect the call from the graph |
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1777 call->disconnect_inputs(NULL); |
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1778 C->gvn_replace_by(call, C->top()); |
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1779 } |
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1780 |
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1781 |
0 | 1782 //------------------------------increment_counter------------------------------ |
1783 // for statistics: increment a VM counter by 1 | |
1784 | |
1785 void GraphKit::increment_counter(address counter_addr) { | |
1786 Node* adr1 = makecon(TypeRawPtr::make(counter_addr)); | |
1787 increment_counter(adr1); | |
1788 } | |
1789 | |
1790 void GraphKit::increment_counter(Node* counter_addr) { | |
1791 int adr_type = Compile::AliasIdxRaw; | |
1609 | 1792 Node* ctrl = control(); |
1793 Node* cnt = make_load(ctrl, counter_addr, TypeInt::INT, T_INT, adr_type); | |
0 | 1794 Node* incr = _gvn.transform(new (C, 3) AddINode(cnt, _gvn.intcon(1))); |
1609 | 1795 store_to_memory( ctrl, counter_addr, incr, T_INT, adr_type ); |
0 | 1796 } |
1797 | |
1798 | |
1799 //------------------------------uncommon_trap---------------------------------- | |
1800 // Bail out to the interpreter in mid-method. Implemented by calling the | |
1801 // uncommon_trap blob. This helper function inserts a runtime call with the | |
1802 // right debug info. | |
1803 void GraphKit::uncommon_trap(int trap_request, | |
1804 ciKlass* klass, const char* comment, | |
1805 bool must_throw, | |
1806 bool keep_exact_action) { | |
1807 if (failing()) stop(); | |
1808 if (stopped()) return; // trap reachable? | |
1809 | |
1810 // Note: If ProfileTraps is true, and if a deopt. actually | |
1811 // occurs here, the runtime will make sure an MDO exists. There is | |
1812 // no need to call method()->build_method_data() at this point. | |
1813 | |
1814 #ifdef ASSERT | |
1815 if (!must_throw) { | |
1816 // Make sure the stack has at least enough depth to execute | |
1817 // the current bytecode. | |
1818 int inputs, ignore; | |
1819 if (compute_stack_effects(inputs, ignore)) { | |
1820 assert(sp() >= inputs, "must have enough JVMS stack to execute"); | |
1821 // It is a frequent error in library_call.cpp to issue an | |
1822 // uncommon trap with the _sp value already popped. | |
1823 } | |
1824 } | |
1825 #endif | |
1826 | |
1827 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request); | |
1828 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request); | |
1829 | |
1830 switch (action) { | |
1831 case Deoptimization::Action_maybe_recompile: | |
1832 case Deoptimization::Action_reinterpret: | |
1833 // Temporary fix for 6529811 to allow virtual calls to be sure they | |
1834 // get the chance to go from mono->bi->mega | |
1835 if (!keep_exact_action && | |
1836 Deoptimization::trap_request_index(trap_request) < 0 && | |
1837 too_many_recompiles(reason)) { | |
1838 // This BCI is causing too many recompilations. | |
1839 action = Deoptimization::Action_none; | |
1840 trap_request = Deoptimization::make_trap_request(reason, action); | |
1841 } else { | |
1842 C->set_trap_can_recompile(true); | |
1843 } | |
1844 break; | |
1845 case Deoptimization::Action_make_not_entrant: | |
1846 C->set_trap_can_recompile(true); | |
1847 break; | |
1848 #ifdef ASSERT | |
1849 case Deoptimization::Action_none: | |
1850 case Deoptimization::Action_make_not_compilable: | |
1851 break; | |
1852 default: | |
1853 assert(false, "bad action"); | |
1854 #endif | |
1855 } | |
1856 | |
1857 if (TraceOptoParse) { | |
1858 char buf[100]; | |
1859 tty->print_cr("Uncommon trap %s at bci:%d", | |
1860 Deoptimization::format_trap_request(buf, sizeof(buf), | |
1861 trap_request), bci()); | |
1862 } | |
1863 | |
1864 CompileLog* log = C->log(); | |
1865 if (log != NULL) { | |
1866 int kid = (klass == NULL)? -1: log->identify(klass); | |
1867 log->begin_elem("uncommon_trap bci='%d'", bci()); | |
1868 char buf[100]; | |
1869 log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf), | |
1870 trap_request)); | |
1871 if (kid >= 0) log->print(" klass='%d'", kid); | |
1872 if (comment != NULL) log->print(" comment='%s'", comment); | |
1873 log->end_elem(); | |
1874 } | |
1875 | |
1876 // Make sure any guarding test views this path as very unlikely | |
1877 Node *i0 = control()->in(0); | |
1878 if (i0 != NULL && i0->is_If()) { // Found a guarding if test? | |
1879 IfNode *iff = i0->as_If(); | |
1880 float f = iff->_prob; // Get prob | |
1881 if (control()->Opcode() == Op_IfTrue) { | |
1882 if (f > PROB_UNLIKELY_MAG(4)) | |
1883 iff->_prob = PROB_MIN; | |
1884 } else { | |
1885 if (f < PROB_LIKELY_MAG(4)) | |
1886 iff->_prob = PROB_MAX; | |
1887 } | |
1888 } | |
1889 | |
1890 // Clear out dead values from the debug info. | |
1891 kill_dead_locals(); | |
1892 | |
1893 // Now insert the uncommon trap subroutine call | |
1894 address call_addr = SharedRuntime::uncommon_trap_blob()->instructions_begin(); | |
1895 const TypePtr* no_memory_effects = NULL; | |
1896 // Pass the index of the class to be loaded | |
1897 Node* call = make_runtime_call(RC_NO_LEAF | RC_UNCOMMON | | |
1898 (must_throw ? RC_MUST_THROW : 0), | |
1899 OptoRuntime::uncommon_trap_Type(), | |
1900 call_addr, "uncommon_trap", no_memory_effects, | |
1901 intcon(trap_request)); | |
1902 assert(call->as_CallStaticJava()->uncommon_trap_request() == trap_request, | |
1903 "must extract request correctly from the graph"); | |
1904 assert(trap_request != 0, "zero value reserved by uncommon_trap_request"); | |
1905 | |
1906 call->set_req(TypeFunc::ReturnAdr, returnadr()); | |
1907 // The debug info is the only real input to this call. | |
1908 | |
1909 // Halt-and-catch fire here. The above call should never return! | |
1910 HaltNode* halt = new(C, TypeFunc::Parms) HaltNode(control(), frameptr()); | |
1911 _gvn.set_type_bottom(halt); | |
1912 root()->add_req(halt); | |
1913 | |
1914 stop_and_kill_map(); | |
1915 } | |
1916 | |
1917 | |
1918 //--------------------------just_allocated_object------------------------------ | |
1919 // Report the object that was just allocated. | |
1920 // It must be the case that there are no intervening safepoints. | |
1921 // We use this to determine if an object is so "fresh" that | |
1922 // it does not require card marks. | |
1923 Node* GraphKit::just_allocated_object(Node* current_control) { | |
1924 if (C->recent_alloc_ctl() == current_control) | |
1925 return C->recent_alloc_obj(); | |
1926 return NULL; | |
1927 } | |
1928 | |
1929 | |
1930 void GraphKit::round_double_arguments(ciMethod* dest_method) { | |
1931 // (Note: TypeFunc::make has a cache that makes this fast.) | |
1932 const TypeFunc* tf = TypeFunc::make(dest_method); | |
1933 int nargs = tf->_domain->_cnt - TypeFunc::Parms; | |
1934 for (int j = 0; j < nargs; j++) { | |
1935 const Type *targ = tf->_domain->field_at(j + TypeFunc::Parms); | |
1936 if( targ->basic_type() == T_DOUBLE ) { | |
1937 // If any parameters are doubles, they must be rounded before | |
1938 // the call, dstore_rounding does gvn.transform | |
1939 Node *arg = argument(j); | |
1940 arg = dstore_rounding(arg); | |
1941 set_argument(j, arg); | |
1942 } | |
1943 } | |
1944 } | |
1945 | |
1946 void GraphKit::round_double_result(ciMethod* dest_method) { | |
1947 // A non-strict method may return a double value which has an extended | |
1948 // exponent, but this must not be visible in a caller which is 'strict' | |
1949 // If a strict caller invokes a non-strict callee, round a double result | |
1950 | |
1951 BasicType result_type = dest_method->return_type()->basic_type(); | |
1952 assert( method() != NULL, "must have caller context"); | |
1953 if( result_type == T_DOUBLE && method()->is_strict() && !dest_method->is_strict() ) { | |
1954 // Destination method's return value is on top of stack | |
1955 // dstore_rounding() does gvn.transform | |
1956 Node *result = pop_pair(); | |
1957 result = dstore_rounding(result); | |
1958 push_pair(result); | |
1959 } | |
1960 } | |
1961 | |
1962 // rounding for strict float precision conformance | |
1963 Node* GraphKit::precision_rounding(Node* n) { | |
1964 return UseStrictFP && _method->flags().is_strict() | |
1965 && UseSSE == 0 && Matcher::strict_fp_requires_explicit_rounding | |
1966 ? _gvn.transform( new (C, 2) RoundFloatNode(0, n) ) | |
1967 : n; | |
1968 } | |
1969 | |
1970 // rounding for strict double precision conformance | |
1971 Node* GraphKit::dprecision_rounding(Node *n) { | |
1972 return UseStrictFP && _method->flags().is_strict() | |
1973 && UseSSE <= 1 && Matcher::strict_fp_requires_explicit_rounding | |
1974 ? _gvn.transform( new (C, 2) RoundDoubleNode(0, n) ) | |
1975 : n; | |
1976 } | |
1977 | |
1978 // rounding for non-strict double stores | |
1979 Node* GraphKit::dstore_rounding(Node* n) { | |
1980 return Matcher::strict_fp_requires_explicit_rounding | |
1981 && UseSSE <= 1 | |
1982 ? _gvn.transform( new (C, 2) RoundDoubleNode(0, n) ) | |
1983 : n; | |
1984 } | |
1985 | |
1986 //============================================================================= | |
1987 // Generate a fast path/slow path idiom. Graph looks like: | |
1988 // [foo] indicates that 'foo' is a parameter | |
1989 // | |
1990 // [in] NULL | |
1991 // \ / | |
1992 // CmpP | |
1993 // Bool ne | |
1994 // If | |
1995 // / \ | |
1996 // True False-<2> | |
1997 // / | | |
1998 // / cast_not_null | |
1999 // Load | | ^ | |
2000 // [fast_test] | | | |
2001 // gvn to opt_test | | | |
2002 // / \ | <1> | |
2003 // True False | | |
2004 // | \\ | | |
2005 // [slow_call] \[fast_result] | |
2006 // Ctl Val \ \ | |
2007 // | \ \ | |
2008 // Catch <1> \ \ | |
2009 // / \ ^ \ \ | |
2010 // Ex No_Ex | \ \ | |
2011 // | \ \ | \ <2> \ | |
2012 // ... \ [slow_res] | | \ [null_result] | |
2013 // \ \--+--+--- | | | |
2014 // \ | / \ | / | |
2015 // --------Region Phi | |
2016 // | |
2017 //============================================================================= | |
2018 // Code is structured as a series of driver functions all called 'do_XXX' that | |
2019 // call a set of helper functions. Helper functions first, then drivers. | |
2020 | |
2021 //------------------------------null_check_oop--------------------------------- | |
2022 // Null check oop. Set null-path control into Region in slot 3. | |
2023 // Make a cast-not-nullness use the other not-null control. Return cast. | |
2024 Node* GraphKit::null_check_oop(Node* value, Node* *null_control, | |
2025 bool never_see_null) { | |
2026 // Initial NULL check taken path | |
2027 (*null_control) = top(); | |
2028 Node* cast = null_check_common(value, T_OBJECT, false, null_control); | |
2029 | |
2030 // Generate uncommon_trap: | |
2031 if (never_see_null && (*null_control) != top()) { | |
2032 // If we see an unexpected null at a check-cast we record it and force a | |
2033 // recompile; the offending check-cast will be compiled to handle NULLs. | |
2034 // If we see more than one offending BCI, then all checkcasts in the | |
2035 // method will be compiled to handle NULLs. | |
2036 PreserveJVMState pjvms(this); | |
2037 set_control(*null_control); | |
332 | 2038 replace_in_map(value, null()); |
0 | 2039 uncommon_trap(Deoptimization::Reason_null_check, |
2040 Deoptimization::Action_make_not_entrant); | |
2041 (*null_control) = top(); // NULL path is dead | |
2042 } | |
2043 | |
2044 // Cast away null-ness on the result | |
2045 return cast; | |
2046 } | |
2047 | |
2048 //------------------------------opt_iff---------------------------------------- | |
2049 // Optimize the fast-check IfNode. Set the fast-path region slot 2. | |
2050 // Return slow-path control. | |
2051 Node* GraphKit::opt_iff(Node* region, Node* iff) { | |
2052 IfNode *opt_iff = _gvn.transform(iff)->as_If(); | |
2053 | |
2054 // Fast path taken; set region slot 2 | |
2055 Node *fast_taken = _gvn.transform( new (C, 1) IfFalseNode(opt_iff) ); | |
2056 region->init_req(2,fast_taken); // Capture fast-control | |
2057 | |
2058 // Fast path not-taken, i.e. slow path | |
2059 Node *slow_taken = _gvn.transform( new (C, 1) IfTrueNode(opt_iff) ); | |
2060 return slow_taken; | |
2061 } | |
2062 | |
2063 //-----------------------------make_runtime_call------------------------------- | |
2064 Node* GraphKit::make_runtime_call(int flags, | |
2065 const TypeFunc* call_type, address call_addr, | |
2066 const char* call_name, | |
2067 const TypePtr* adr_type, | |
2068 // The following parms are all optional. | |
2069 // The first NULL ends the list. | |
2070 Node* parm0, Node* parm1, | |
2071 Node* parm2, Node* parm3, | |
2072 Node* parm4, Node* parm5, | |
2073 Node* parm6, Node* parm7) { | |
2074 // Slow-path call | |
2075 int size = call_type->domain()->cnt(); | |
2076 bool is_leaf = !(flags & RC_NO_LEAF); | |
2077 bool has_io = (!is_leaf && !(flags & RC_NO_IO)); | |
2078 if (call_name == NULL) { | |
2079 assert(!is_leaf, "must supply name for leaf"); | |
2080 call_name = OptoRuntime::stub_name(call_addr); | |
2081 } | |
2082 CallNode* call; | |
2083 if (!is_leaf) { | |
2084 call = new(C, size) CallStaticJavaNode(call_type, call_addr, call_name, | |
2085 bci(), adr_type); | |
2086 } else if (flags & RC_NO_FP) { | |
2087 call = new(C, size) CallLeafNoFPNode(call_type, call_addr, call_name, adr_type); | |
2088 } else { | |
2089 call = new(C, size) CallLeafNode(call_type, call_addr, call_name, adr_type); | |
2090 } | |
2091 | |
2092 // The following is similar to set_edges_for_java_call, | |
2093 // except that the memory effects of the call are restricted to AliasIdxRaw. | |
2094 | |
2095 // Slow path call has no side-effects, uses few values | |
2096 bool wide_in = !(flags & RC_NARROW_MEM); | |
2097 bool wide_out = (C->get_alias_index(adr_type) == Compile::AliasIdxBot); | |
2098 | |
2099 Node* prev_mem = NULL; | |
2100 if (wide_in) { | |
2101 prev_mem = set_predefined_input_for_runtime_call(call); | |
2102 } else { | |
2103 assert(!wide_out, "narrow in => narrow out"); | |
2104 Node* narrow_mem = memory(adr_type); | |
2105 prev_mem = reset_memory(); | |
2106 map()->set_memory(narrow_mem); | |
2107 set_predefined_input_for_runtime_call(call); | |
2108 } | |
2109 | |
2110 // Hook each parm in order. Stop looking at the first NULL. | |
2111 if (parm0 != NULL) { call->init_req(TypeFunc::Parms+0, parm0); | |
2112 if (parm1 != NULL) { call->init_req(TypeFunc::Parms+1, parm1); | |
2113 if (parm2 != NULL) { call->init_req(TypeFunc::Parms+2, parm2); | |
2114 if (parm3 != NULL) { call->init_req(TypeFunc::Parms+3, parm3); | |
2115 if (parm4 != NULL) { call->init_req(TypeFunc::Parms+4, parm4); | |
2116 if (parm5 != NULL) { call->init_req(TypeFunc::Parms+5, parm5); | |
2117 if (parm6 != NULL) { call->init_req(TypeFunc::Parms+6, parm6); | |
2118 if (parm7 != NULL) { call->init_req(TypeFunc::Parms+7, parm7); | |
2119 /* close each nested if ===> */ } } } } } } } } | |
2120 assert(call->in(call->req()-1) != NULL, "must initialize all parms"); | |
2121 | |
2122 if (!is_leaf) { | |
2123 // Non-leaves can block and take safepoints: | |
2124 add_safepoint_edges(call, ((flags & RC_MUST_THROW) != 0)); | |
2125 } | |
2126 // Non-leaves can throw exceptions: | |
2127 if (has_io) { | |
2128 call->set_req(TypeFunc::I_O, i_o()); | |
2129 } | |
2130 | |
2131 if (flags & RC_UNCOMMON) { | |
2132 // Set the count to a tiny probability. Cf. Estimate_Block_Frequency. | |
2133 // (An "if" probability corresponds roughly to an unconditional count. | |
2134 // Sort of.) | |
2135 call->set_cnt(PROB_UNLIKELY_MAG(4)); | |
2136 } | |
2137 | |
2138 Node* c = _gvn.transform(call); | |
2139 assert(c == call, "cannot disappear"); | |
2140 | |
2141 if (wide_out) { | |
2142 // Slow path call has full side-effects. | |
2143 set_predefined_output_for_runtime_call(call); | |
2144 } else { | |
2145 // Slow path call has few side-effects, and/or sets few values. | |
2146 set_predefined_output_for_runtime_call(call, prev_mem, adr_type); | |
2147 } | |
2148 | |
2149 if (has_io) { | |
2150 set_i_o(_gvn.transform(new (C, 1) ProjNode(call, TypeFunc::I_O))); | |
2151 } | |
2152 return call; | |
2153 | |
2154 } | |
2155 | |
2156 //------------------------------merge_memory----------------------------------- | |
2157 // Merge memory from one path into the current memory state. | |
2158 void GraphKit::merge_memory(Node* new_mem, Node* region, int new_path) { | |
2159 for (MergeMemStream mms(merged_memory(), new_mem->as_MergeMem()); mms.next_non_empty2(); ) { | |
2160 Node* old_slice = mms.force_memory(); | |
2161 Node* new_slice = mms.memory2(); | |
2162 if (old_slice != new_slice) { | |
2163 PhiNode* phi; | |
2164 if (new_slice->is_Phi() && new_slice->as_Phi()->region() == region) { | |
2165 phi = new_slice->as_Phi(); | |
2166 #ifdef ASSERT | |
2167 if (old_slice->is_Phi() && old_slice->as_Phi()->region() == region) | |
2168 old_slice = old_slice->in(new_path); | |
2169 // Caller is responsible for ensuring that any pre-existing | |
2170 // phis are already aware of old memory. | |
2171 int old_path = (new_path > 1) ? 1 : 2; // choose old_path != new_path | |
2172 assert(phi->in(old_path) == old_slice, "pre-existing phis OK"); | |
2173 #endif | |
2174 mms.set_memory(phi); | |
2175 } else { | |
2176 phi = PhiNode::make(region, old_slice, Type::MEMORY, mms.adr_type(C)); | |
2177 _gvn.set_type(phi, Type::MEMORY); | |
2178 phi->set_req(new_path, new_slice); | |
2179 mms.set_memory(_gvn.transform(phi)); // assume it is complete | |
2180 } | |
2181 } | |
2182 } | |
2183 } | |
2184 | |
2185 //------------------------------make_slow_call_ex------------------------------ | |
2186 // Make the exception handler hookups for the slow call | |
2187 void GraphKit::make_slow_call_ex(Node* call, ciInstanceKlass* ex_klass, bool separate_io_proj) { | |
2188 if (stopped()) return; | |
2189 | |
2190 // Make a catch node with just two handlers: fall-through and catch-all | |
2191 Node* i_o = _gvn.transform( new (C, 1) ProjNode(call, TypeFunc::I_O, separate_io_proj) ); | |
2192 Node* catc = _gvn.transform( new (C, 2) CatchNode(control(), i_o, 2) ); | |
2193 Node* norm = _gvn.transform( new (C, 1) CatchProjNode(catc, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci) ); | |
2194 Node* excp = _gvn.transform( new (C, 1) CatchProjNode(catc, CatchProjNode::catch_all_index, CatchProjNode::no_handler_bci) ); | |
2195 | |
2196 { PreserveJVMState pjvms(this); | |
2197 set_control(excp); | |
2198 set_i_o(i_o); | |
2199 | |
2200 if (excp != top()) { | |
2201 // Create an exception state also. | |
2202 // Use an exact type if the caller has specified a specific exception. | |
2203 const Type* ex_type = TypeOopPtr::make_from_klass_unique(ex_klass)->cast_to_ptr_type(TypePtr::NotNull); | |
2204 Node* ex_oop = new (C, 2) CreateExNode(ex_type, control(), i_o); | |
2205 add_exception_state(make_exception_state(_gvn.transform(ex_oop))); | |
2206 } | |
2207 } | |
2208 | |
2209 // Get the no-exception control from the CatchNode. | |
2210 set_control(norm); | |
2211 } | |
2212 | |
2213 | |
2214 //-------------------------------gen_subtype_check----------------------------- | |
2215 // Generate a subtyping check. Takes as input the subtype and supertype. | |
2216 // Returns 2 values: sets the default control() to the true path and returns | |
2217 // the false path. Only reads invariant memory; sets no (visible) memory. | |
2218 // The PartialSubtypeCheckNode sets the hidden 1-word cache in the encoding | |
2219 // but that's not exposed to the optimizer. This call also doesn't take in an | |
2220 // Object; if you wish to check an Object you need to load the Object's class | |
2221 // prior to coming here. | |
2222 Node* GraphKit::gen_subtype_check(Node* subklass, Node* superklass) { | |
2223 // Fast check for identical types, perhaps identical constants. | |
2224 // The types can even be identical non-constants, in cases | |
2225 // involving Array.newInstance, Object.clone, etc. | |
2226 if (subklass == superklass) | |
2227 return top(); // false path is dead; no test needed. | |
2228 | |
2229 if (_gvn.type(superklass)->singleton()) { | |
2230 ciKlass* superk = _gvn.type(superklass)->is_klassptr()->klass(); | |
2231 ciKlass* subk = _gvn.type(subklass)->is_klassptr()->klass(); | |
2232 | |
2233 // In the common case of an exact superklass, try to fold up the | |
2234 // test before generating code. You may ask, why not just generate | |
2235 // the code and then let it fold up? The answer is that the generated | |
2236 // code will necessarily include null checks, which do not always | |
2237 // completely fold away. If they are also needless, then they turn | |
2238 // into a performance loss. Example: | |
2239 // Foo[] fa = blah(); Foo x = fa[0]; fa[1] = x; | |
2240 // Here, the type of 'fa' is often exact, so the store check | |
2241 // of fa[1]=x will fold up, without testing the nullness of x. | |
2242 switch (static_subtype_check(superk, subk)) { | |
2243 case SSC_always_false: | |
2244 { | |
2245 Node* always_fail = control(); | |
2246 set_control(top()); | |
2247 return always_fail; | |
2248 } | |
2249 case SSC_always_true: | |
2250 return top(); | |
2251 case SSC_easy_test: | |
2252 { | |
2253 // Just do a direct pointer compare and be done. | |
2254 Node* cmp = _gvn.transform( new(C, 3) CmpPNode(subklass, superklass) ); | |
2255 Node* bol = _gvn.transform( new(C, 2) BoolNode(cmp, BoolTest::eq) ); | |
2256 IfNode* iff = create_and_xform_if(control(), bol, PROB_STATIC_FREQUENT, COUNT_UNKNOWN); | |
2257 set_control( _gvn.transform( new(C, 1) IfTrueNode (iff) ) ); | |
2258 return _gvn.transform( new(C, 1) IfFalseNode(iff) ); | |
2259 } | |
2260 case SSC_full_test: | |
2261 break; | |
2262 default: | |
2263 ShouldNotReachHere(); | |
2264 } | |
2265 } | |
2266 | |
2267 // %%% Possible further optimization: Even if the superklass is not exact, | |
2268 // if the subklass is the unique subtype of the superklass, the check | |
2269 // will always succeed. We could leave a dependency behind to ensure this. | |
2270 | |
2271 // First load the super-klass's check-offset | |
2272 Node *p1 = basic_plus_adr( superklass, superklass, sizeof(oopDesc) + Klass::super_check_offset_offset_in_bytes() ); | |
2273 Node *chk_off = _gvn.transform( new (C, 3) LoadINode( NULL, memory(p1), p1, _gvn.type(p1)->is_ptr() ) ); | |
2274 int cacheoff_con = sizeof(oopDesc) + Klass::secondary_super_cache_offset_in_bytes(); | |
2275 bool might_be_cache = (find_int_con(chk_off, cacheoff_con) == cacheoff_con); | |
2276 | |
2277 // Load from the sub-klass's super-class display list, or a 1-word cache of | |
2278 // the secondary superclass list, or a failing value with a sentinel offset | |
2279 // if the super-klass is an interface or exceptionally deep in the Java | |
2280 // hierarchy and we have to scan the secondary superclass list the hard way. | |
2281 // Worst-case type is a little odd: NULL is allowed as a result (usually | |
2282 // klass loads can never produce a NULL). | |
2283 Node *chk_off_X = ConvI2X(chk_off); | |
2284 Node *p2 = _gvn.transform( new (C, 4) AddPNode(subklass,subklass,chk_off_X) ); | |
2285 // For some types like interfaces the following loadKlass is from a 1-word | |
2286 // cache which is mutable so can't use immutable memory. Other | |
2287 // types load from the super-class display table which is immutable. | |
2288 Node *kmem = might_be_cache ? memory(p2) : immutable_memory(); | |
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2289 Node *nkls = _gvn.transform( LoadKlassNode::make( _gvn, kmem, p2, _gvn.type(p2)->is_ptr(), TypeKlassPtr::OBJECT_OR_NULL ) ); |
0 | 2290 |
2291 // Compile speed common case: ARE a subtype and we canNOT fail | |
2292 if( superklass == nkls ) | |
2293 return top(); // false path is dead; no test needed. | |
2294 | |
2295 // See if we get an immediate positive hit. Happens roughly 83% of the | |
2296 // time. Test to see if the value loaded just previously from the subklass | |
2297 // is exactly the superklass. | |
2298 Node *cmp1 = _gvn.transform( new (C, 3) CmpPNode( superklass, nkls ) ); | |
2299 Node *bol1 = _gvn.transform( new (C, 2) BoolNode( cmp1, BoolTest::eq ) ); | |
2300 IfNode *iff1 = create_and_xform_if( control(), bol1, PROB_LIKELY(0.83f), COUNT_UNKNOWN ); | |
2301 Node *iftrue1 = _gvn.transform( new (C, 1) IfTrueNode ( iff1 ) ); | |
2302 set_control( _gvn.transform( new (C, 1) IfFalseNode( iff1 ) ) ); | |
2303 | |
2304 // Compile speed common case: Check for being deterministic right now. If | |
2305 // chk_off is a constant and not equal to cacheoff then we are NOT a | |
2306 // subklass. In this case we need exactly the 1 test above and we can | |
2307 // return those results immediately. | |
2308 if (!might_be_cache) { | |
2309 Node* not_subtype_ctrl = control(); | |
2310 set_control(iftrue1); // We need exactly the 1 test above | |
2311 return not_subtype_ctrl; | |
2312 } | |
2313 | |
2314 // Gather the various success & failures here | |
2315 RegionNode *r_ok_subtype = new (C, 4) RegionNode(4); | |
2316 record_for_igvn(r_ok_subtype); | |
2317 RegionNode *r_not_subtype = new (C, 3) RegionNode(3); | |
2318 record_for_igvn(r_not_subtype); | |
2319 | |
2320 r_ok_subtype->init_req(1, iftrue1); | |
2321 | |
2322 // Check for immediate negative hit. Happens roughly 11% of the time (which | |
2323 // is roughly 63% of the remaining cases). Test to see if the loaded | |
2324 // check-offset points into the subklass display list or the 1-element | |
2325 // cache. If it points to the display (and NOT the cache) and the display | |
2326 // missed then it's not a subtype. | |
2327 Node *cacheoff = _gvn.intcon(cacheoff_con); | |
2328 Node *cmp2 = _gvn.transform( new (C, 3) CmpINode( chk_off, cacheoff ) ); | |
2329 Node *bol2 = _gvn.transform( new (C, 2) BoolNode( cmp2, BoolTest::ne ) ); | |
2330 IfNode *iff2 = create_and_xform_if( control(), bol2, PROB_LIKELY(0.63f), COUNT_UNKNOWN ); | |
2331 r_not_subtype->init_req(1, _gvn.transform( new (C, 1) IfTrueNode (iff2) ) ); | |
2332 set_control( _gvn.transform( new (C, 1) IfFalseNode(iff2) ) ); | |
2333 | |
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2334 // Check for self. Very rare to get here, but it is taken 1/3 the time. |
0 | 2335 // No performance impact (too rare) but allows sharing of secondary arrays |
2336 // which has some footprint reduction. | |
2337 Node *cmp3 = _gvn.transform( new (C, 3) CmpPNode( subklass, superklass ) ); | |
2338 Node *bol3 = _gvn.transform( new (C, 2) BoolNode( cmp3, BoolTest::eq ) ); | |
2339 IfNode *iff3 = create_and_xform_if( control(), bol3, PROB_LIKELY(0.36f), COUNT_UNKNOWN ); | |
2340 r_ok_subtype->init_req(2, _gvn.transform( new (C, 1) IfTrueNode ( iff3 ) ) ); | |
2341 set_control( _gvn.transform( new (C, 1) IfFalseNode( iff3 ) ) ); | |
2342 | |
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2343 // -- Roads not taken here: -- |
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2344 // We could also have chosen to perform the self-check at the beginning |
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2345 // of this code sequence, as the assembler does. This would not pay off |
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2346 // the same way, since the optimizer, unlike the assembler, can perform |
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2347 // static type analysis to fold away many successful self-checks. |
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2348 // Non-foldable self checks work better here in second position, because |
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2349 // the initial primary superclass check subsumes a self-check for most |
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2350 // types. An exception would be a secondary type like array-of-interface, |
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2351 // which does not appear in its own primary supertype display. |
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2352 // Finally, we could have chosen to move the self-check into the |
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2353 // PartialSubtypeCheckNode, and from there out-of-line in a platform |
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2354 // dependent manner. But it is worthwhile to have the check here, |
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2355 // where it can be perhaps be optimized. The cost in code space is |
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2356 // small (register compare, branch). |
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2357 |
0 | 2358 // Now do a linear scan of the secondary super-klass array. Again, no real |
2359 // performance impact (too rare) but it's gotta be done. | |
2360 // Since the code is rarely used, there is no penalty for moving it | |
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2361 // out of line, and it can only improve I-cache density. |
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2362 // The decision to inline or out-of-line this final check is platform |
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2363 // dependent, and is found in the AD file definition of PartialSubtypeCheck. |
0 | 2364 Node* psc = _gvn.transform( |
2365 new (C, 3) PartialSubtypeCheckNode(control(), subklass, superklass) ); | |
2366 | |
2367 Node *cmp4 = _gvn.transform( new (C, 3) CmpPNode( psc, null() ) ); | |
2368 Node *bol4 = _gvn.transform( new (C, 2) BoolNode( cmp4, BoolTest::ne ) ); | |
2369 IfNode *iff4 = create_and_xform_if( control(), bol4, PROB_FAIR, COUNT_UNKNOWN ); | |
2370 r_not_subtype->init_req(2, _gvn.transform( new (C, 1) IfTrueNode (iff4) ) ); | |
2371 r_ok_subtype ->init_req(3, _gvn.transform( new (C, 1) IfFalseNode(iff4) ) ); | |
2372 | |
2373 // Return false path; set default control to true path. | |
2374 set_control( _gvn.transform(r_ok_subtype) ); | |
2375 return _gvn.transform(r_not_subtype); | |
2376 } | |
2377 | |
2378 //----------------------------static_subtype_check----------------------------- | |
2379 // Shortcut important common cases when superklass is exact: | |
2380 // (0) superklass is java.lang.Object (can occur in reflective code) | |
2381 // (1) subklass is already limited to a subtype of superklass => always ok | |
2382 // (2) subklass does not overlap with superklass => always fail | |
2383 // (3) superklass has NO subtypes and we can check with a simple compare. | |
2384 int GraphKit::static_subtype_check(ciKlass* superk, ciKlass* subk) { | |
2385 if (StressReflectiveCode) { | |
2386 return SSC_full_test; // Let caller generate the general case. | |
2387 } | |
2388 | |
2389 if (superk == env()->Object_klass()) { | |
2390 return SSC_always_true; // (0) this test cannot fail | |
2391 } | |
2392 | |
2393 ciType* superelem = superk; | |
2394 if (superelem->is_array_klass()) | |
2395 superelem = superelem->as_array_klass()->base_element_type(); | |
2396 | |
2397 if (!subk->is_interface()) { // cannot trust static interface types yet | |
2398 if (subk->is_subtype_of(superk)) { | |
2399 return SSC_always_true; // (1) false path dead; no dynamic test needed | |
2400 } | |
2401 if (!(superelem->is_klass() && superelem->as_klass()->is_interface()) && | |
2402 !superk->is_subtype_of(subk)) { | |
2403 return SSC_always_false; | |
2404 } | |
2405 } | |
2406 | |
2407 // If casting to an instance klass, it must have no subtypes | |
2408 if (superk->is_interface()) { | |
2409 // Cannot trust interfaces yet. | |
2410 // %%% S.B. superk->nof_implementors() == 1 | |
2411 } else if (superelem->is_instance_klass()) { | |
2412 ciInstanceKlass* ik = superelem->as_instance_klass(); | |
2413 if (!ik->has_subklass() && !ik->is_interface()) { | |
2414 if (!ik->is_final()) { | |
2415 // Add a dependency if there is a chance of a later subclass. | |
2416 C->dependencies()->assert_leaf_type(ik); | |
2417 } | |
2418 return SSC_easy_test; // (3) caller can do a simple ptr comparison | |
2419 } | |
2420 } else { | |
2421 // A primitive array type has no subtypes. | |
2422 return SSC_easy_test; // (3) caller can do a simple ptr comparison | |
2423 } | |
2424 | |
2425 return SSC_full_test; | |
2426 } | |
2427 | |
2428 // Profile-driven exact type check: | |
2429 Node* GraphKit::type_check_receiver(Node* receiver, ciKlass* klass, | |
2430 float prob, | |
2431 Node* *casted_receiver) { | |
2432 const TypeKlassPtr* tklass = TypeKlassPtr::make(klass); | |
2433 Node* recv_klass = load_object_klass(receiver); | |
2434 Node* want_klass = makecon(tklass); | |
2435 Node* cmp = _gvn.transform( new(C, 3) CmpPNode(recv_klass, want_klass) ); | |
2436 Node* bol = _gvn.transform( new(C, 2) BoolNode(cmp, BoolTest::eq) ); | |
2437 IfNode* iff = create_and_xform_if(control(), bol, prob, COUNT_UNKNOWN); | |
2438 set_control( _gvn.transform( new(C, 1) IfTrueNode (iff) )); | |
2439 Node* fail = _gvn.transform( new(C, 1) IfFalseNode(iff) ); | |
2440 | |
2441 const TypeOopPtr* recv_xtype = tklass->as_instance_type(); | |
2442 assert(recv_xtype->klass_is_exact(), ""); | |
2443 | |
2444 // Subsume downstream occurrences of receiver with a cast to | |
2445 // recv_xtype, since now we know what the type will be. | |
2446 Node* cast = new(C, 2) CheckCastPPNode(control(), receiver, recv_xtype); | |
2447 (*casted_receiver) = _gvn.transform(cast); | |
2448 // (User must make the replace_in_map call.) | |
2449 | |
2450 return fail; | |
2451 } | |
2452 | |
2453 | |
2454 //-------------------------------gen_instanceof-------------------------------- | |
2455 // Generate an instance-of idiom. Used by both the instance-of bytecode | |
2456 // and the reflective instance-of call. | |
2457 Node* GraphKit::gen_instanceof( Node *subobj, Node* superklass ) { | |
2458 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
2459 assert( !stopped(), "dead parse path should be checked in callers" ); | |
2460 assert(!TypePtr::NULL_PTR->higher_equal(_gvn.type(superklass)->is_klassptr()), | |
2461 "must check for not-null not-dead klass in callers"); | |
2462 | |
2463 // Make the merge point | |
2464 enum { _obj_path = 1, _fail_path, _null_path, PATH_LIMIT }; | |
2465 RegionNode* region = new(C, PATH_LIMIT) RegionNode(PATH_LIMIT); | |
2466 Node* phi = new(C, PATH_LIMIT) PhiNode(region, TypeInt::BOOL); | |
2467 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
2468 | |
2469 // Null check; get casted pointer; set region slot 3 | |
2470 Node* null_ctl = top(); | |
2471 Node* not_null_obj = null_check_oop(subobj, &null_ctl); | |
2472 | |
2473 // If not_null_obj is dead, only null-path is taken | |
2474 if (stopped()) { // Doing instance-of on a NULL? | |
2475 set_control(null_ctl); | |
2476 return intcon(0); | |
2477 } | |
2478 region->init_req(_null_path, null_ctl); | |
2479 phi ->init_req(_null_path, intcon(0)); // Set null path value | |
2480 | |
2481 // Load the object's klass | |
2482 Node* obj_klass = load_object_klass(not_null_obj); | |
2483 | |
2484 // Generate the subtype check | |
2485 Node* not_subtype_ctrl = gen_subtype_check(obj_klass, superklass); | |
2486 | |
2487 // Plug in the success path to the general merge in slot 1. | |
2488 region->init_req(_obj_path, control()); | |
2489 phi ->init_req(_obj_path, intcon(1)); | |
2490 | |
2491 // Plug in the failing path to the general merge in slot 2. | |
2492 region->init_req(_fail_path, not_subtype_ctrl); | |
2493 phi ->init_req(_fail_path, intcon(0)); | |
2494 | |
2495 // Return final merged results | |
2496 set_control( _gvn.transform(region) ); | |
2497 record_for_igvn(region); | |
2498 return _gvn.transform(phi); | |
2499 } | |
2500 | |
2501 //-------------------------------gen_checkcast--------------------------------- | |
2502 // Generate a checkcast idiom. Used by both the checkcast bytecode and the | |
2503 // array store bytecode. Stack must be as-if BEFORE doing the bytecode so the | |
2504 // uncommon-trap paths work. Adjust stack after this call. | |
2505 // If failure_control is supplied and not null, it is filled in with | |
2506 // the control edge for the cast failure. Otherwise, an appropriate | |
2507 // uncommon trap or exception is thrown. | |
2508 Node* GraphKit::gen_checkcast(Node *obj, Node* superklass, | |
2509 Node* *failure_control) { | |
2510 kill_dead_locals(); // Benefit all the uncommon traps | |
2511 const TypeKlassPtr *tk = _gvn.type(superklass)->is_klassptr(); | |
2512 const Type *toop = TypeOopPtr::make_from_klass(tk->klass()); | |
2513 | |
2514 // Fast cutout: Check the case that the cast is vacuously true. | |
2515 // This detects the common cases where the test will short-circuit | |
2516 // away completely. We do this before we perform the null check, | |
2517 // because if the test is going to turn into zero code, we don't | |
2518 // want a residual null check left around. (Causes a slowdown, | |
2519 // for example, in some objArray manipulations, such as a[i]=a[j].) | |
2520 if (tk->singleton()) { | |
2521 const TypeOopPtr* objtp = _gvn.type(obj)->isa_oopptr(); | |
2522 if (objtp != NULL && objtp->klass() != NULL) { | |
2523 switch (static_subtype_check(tk->klass(), objtp->klass())) { | |
2524 case SSC_always_true: | |
2525 return obj; | |
2526 case SSC_always_false: | |
2527 // It needs a null check because a null will *pass* the cast check. | |
2528 // A non-null value will always produce an exception. | |
2529 return do_null_assert(obj, T_OBJECT); | |
2530 } | |
2531 } | |
2532 } | |
2533 | |
2534 ciProfileData* data = NULL; | |
2535 if (failure_control == NULL) { // use MDO in regular case only | |
2536 assert(java_bc() == Bytecodes::_aastore || | |
2537 java_bc() == Bytecodes::_checkcast, | |
2538 "interpreter profiles type checks only for these BCs"); | |
2539 data = method()->method_data()->bci_to_data(bci()); | |
2540 } | |
2541 | |
2542 // Make the merge point | |
2543 enum { _obj_path = 1, _null_path, PATH_LIMIT }; | |
2544 RegionNode* region = new (C, PATH_LIMIT) RegionNode(PATH_LIMIT); | |
2545 Node* phi = new (C, PATH_LIMIT) PhiNode(region, toop); | |
2546 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
2547 | |
2548 // Use null-cast information if it is available | |
2549 bool never_see_null = false; | |
2550 // If we see an unexpected null at a check-cast we record it and force a | |
2551 // recompile; the offending check-cast will be compiled to handle NULLs. | |
2552 // If we see several offending BCIs, then all checkcasts in the | |
2553 // method will be compiled to handle NULLs. | |
2554 if (UncommonNullCast // Cutout for this technique | |
2555 && failure_control == NULL // regular case | |
2556 && obj != null() // And not the -Xcomp stupid case? | |
2557 && !too_many_traps(Deoptimization::Reason_null_check)) { | |
2558 // Finally, check the "null_seen" bit from the interpreter. | |
2559 if (data == NULL || !data->as_BitData()->null_seen()) { | |
2560 never_see_null = true; | |
2561 } | |
2562 } | |
2563 | |
2564 // Null check; get casted pointer; set region slot 3 | |
2565 Node* null_ctl = top(); | |
2566 Node* not_null_obj = null_check_oop(obj, &null_ctl, never_see_null); | |
2567 | |
2568 // If not_null_obj is dead, only null-path is taken | |
2569 if (stopped()) { // Doing instance-of on a NULL? | |
2570 set_control(null_ctl); | |
2571 return null(); | |
2572 } | |
2573 region->init_req(_null_path, null_ctl); | |
2574 phi ->init_req(_null_path, null()); // Set null path value | |
2575 | |
2576 Node* cast_obj = NULL; // the casted version of the object | |
2577 | |
2578 // If the profile has seen exactly one type, narrow to that type. | |
2579 // (The subsequent subtype check will always fold up.) | |
2580 if (UseTypeProfile && TypeProfileCasts && data != NULL && | |
2581 // Counter has never been decremented (due to cast failure). | |
2582 // ...This is a reasonable thing to expect. It is true of | |
2583 // all casts inserted by javac to implement generic types. | |
2584 data->as_CounterData()->count() >= 0 && | |
2585 !too_many_traps(Deoptimization::Reason_class_check)) { | |
2586 // (No, this isn't a call, but it's enough like a virtual call | |
2587 // to use the same ciMethod accessor to get the profile info...) | |
2588 ciCallProfile profile = method()->call_profile_at_bci(bci()); | |
2589 if (profile.count() >= 0 && // no cast failures here | |
2590 profile.has_receiver(0) && | |
2591 profile.morphism() == 1) { | |
2592 ciKlass* exact_kls = profile.receiver(0); | |
2593 int ssc = static_subtype_check(tk->klass(), exact_kls); | |
2594 if (ssc == SSC_always_true) { | |
2595 // If we narrow the type to match what the type profile sees, | |
2596 // we can then remove the rest of the cast. | |
2597 // This is a win, even if the exact_kls is very specific, | |
2598 // because downstream operations, such as method calls, | |
2599 // will often benefit from the sharper type. | |
2600 Node* exact_obj = not_null_obj; // will get updated in place... | |
2601 Node* slow_ctl = type_check_receiver(exact_obj, exact_kls, 1.0, | |
2602 &exact_obj); | |
2603 { PreserveJVMState pjvms(this); | |
2604 set_control(slow_ctl); | |
2605 uncommon_trap(Deoptimization::Reason_class_check, | |
2606 Deoptimization::Action_maybe_recompile); | |
2607 } | |
2608 if (failure_control != NULL) // failure is now impossible | |
2609 (*failure_control) = top(); | |
2610 replace_in_map(not_null_obj, exact_obj); | |
2611 // adjust the type of the phi to the exact klass: | |
2612 phi->raise_bottom_type(_gvn.type(exact_obj)->meet(TypePtr::NULL_PTR)); | |
2613 cast_obj = exact_obj; | |
2614 } | |
2615 // assert(cast_obj != NULL)... except maybe the profile lied to us. | |
2616 } | |
2617 } | |
2618 | |
2619 if (cast_obj == NULL) { | |
2620 // Load the object's klass | |
2621 Node* obj_klass = load_object_klass(not_null_obj); | |
2622 | |
2623 // Generate the subtype check | |
2624 Node* not_subtype_ctrl = gen_subtype_check( obj_klass, superklass ); | |
2625 | |
2626 // Plug in success path into the merge | |
2627 cast_obj = _gvn.transform(new (C, 2) CheckCastPPNode(control(), | |
2628 not_null_obj, toop)); | |
2629 // Failure path ends in uncommon trap (or may be dead - failure impossible) | |
2630 if (failure_control == NULL) { | |
2631 if (not_subtype_ctrl != top()) { // If failure is possible | |
2632 PreserveJVMState pjvms(this); | |
2633 set_control(not_subtype_ctrl); | |
2634 builtin_throw(Deoptimization::Reason_class_check, obj_klass); | |
2635 } | |
2636 } else { | |
2637 (*failure_control) = not_subtype_ctrl; | |
2638 } | |
2639 } | |
2640 | |
2641 region->init_req(_obj_path, control()); | |
2642 phi ->init_req(_obj_path, cast_obj); | |
2643 | |
2644 // A merge of NULL or Casted-NotNull obj | |
2645 Node* res = _gvn.transform(phi); | |
2646 | |
2647 // Note I do NOT always 'replace_in_map(obj,result)' here. | |
2648 // if( tk->klass()->can_be_primary_super() ) | |
2649 // This means that if I successfully store an Object into an array-of-String | |
2650 // I 'forget' that the Object is really now known to be a String. I have to | |
2651 // do this because we don't have true union types for interfaces - if I store | |
2652 // a Baz into an array-of-Interface and then tell the optimizer it's an | |
2653 // Interface, I forget that it's also a Baz and cannot do Baz-like field | |
2654 // references to it. FIX THIS WHEN UNION TYPES APPEAR! | |
2655 // replace_in_map( obj, res ); | |
2656 | |
2657 // Return final merged results | |
2658 set_control( _gvn.transform(region) ); | |
2659 record_for_igvn(region); | |
2660 return res; | |
2661 } | |
2662 | |
2663 //------------------------------next_monitor----------------------------------- | |
2664 // What number should be given to the next monitor? | |
2665 int GraphKit::next_monitor() { | |
2666 int current = jvms()->monitor_depth()* C->sync_stack_slots(); | |
2667 int next = current + C->sync_stack_slots(); | |
2668 // Keep the toplevel high water mark current: | |
2669 if (C->fixed_slots() < next) C->set_fixed_slots(next); | |
2670 return current; | |
2671 } | |
2672 | |
2673 //------------------------------insert_mem_bar--------------------------------- | |
2674 // Memory barrier to avoid floating things around | |
2675 // The membar serves as a pinch point between both control and all memory slices. | |
2676 Node* GraphKit::insert_mem_bar(int opcode, Node* precedent) { | |
2677 MemBarNode* mb = MemBarNode::make(C, opcode, Compile::AliasIdxBot, precedent); | |
2678 mb->init_req(TypeFunc::Control, control()); | |
2679 mb->init_req(TypeFunc::Memory, reset_memory()); | |
2680 Node* membar = _gvn.transform(mb); | |
2681 set_control(_gvn.transform(new (C, 1) ProjNode(membar,TypeFunc::Control) )); | |
2682 set_all_memory_call(membar); | |
2683 return membar; | |
2684 } | |
2685 | |
2686 //-------------------------insert_mem_bar_volatile---------------------------- | |
2687 // Memory barrier to avoid floating things around | |
2688 // The membar serves as a pinch point between both control and memory(alias_idx). | |
2689 // If you want to make a pinch point on all memory slices, do not use this | |
2690 // function (even with AliasIdxBot); use insert_mem_bar() instead. | |
2691 Node* GraphKit::insert_mem_bar_volatile(int opcode, int alias_idx, Node* precedent) { | |
2692 // When Parse::do_put_xxx updates a volatile field, it appends a series | |
2693 // of MemBarVolatile nodes, one for *each* volatile field alias category. | |
2694 // The first membar is on the same memory slice as the field store opcode. | |
2695 // This forces the membar to follow the store. (Bug 6500685 broke this.) | |
2696 // All the other membars (for other volatile slices, including AliasIdxBot, | |
2697 // which stands for all unknown volatile slices) are control-dependent | |
2698 // on the first membar. This prevents later volatile loads or stores | |
2699 // from sliding up past the just-emitted store. | |
2700 | |
2701 MemBarNode* mb = MemBarNode::make(C, opcode, alias_idx, precedent); | |
2702 mb->set_req(TypeFunc::Control,control()); | |
2703 if (alias_idx == Compile::AliasIdxBot) { | |
2704 mb->set_req(TypeFunc::Memory, merged_memory()->base_memory()); | |
2705 } else { | |
2706 assert(!(opcode == Op_Initialize && alias_idx != Compile::AliasIdxRaw), "fix caller"); | |
2707 mb->set_req(TypeFunc::Memory, memory(alias_idx)); | |
2708 } | |
2709 Node* membar = _gvn.transform(mb); | |
2710 set_control(_gvn.transform(new (C, 1) ProjNode(membar, TypeFunc::Control))); | |
2711 if (alias_idx == Compile::AliasIdxBot) { | |
2712 merged_memory()->set_base_memory(_gvn.transform(new (C, 1) ProjNode(membar, TypeFunc::Memory))); | |
2713 } else { | |
2714 set_memory(_gvn.transform(new (C, 1) ProjNode(membar, TypeFunc::Memory)),alias_idx); | |
2715 } | |
2716 return membar; | |
2717 } | |
2718 | |
2719 //------------------------------shared_lock------------------------------------ | |
2720 // Emit locking code. | |
2721 FastLockNode* GraphKit::shared_lock(Node* obj) { | |
2722 // bci is either a monitorenter bc or InvocationEntryBci | |
2723 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces | |
2724 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); | |
2725 | |
2726 if( !GenerateSynchronizationCode ) | |
2727 return NULL; // Not locking things? | |
2728 if (stopped()) // Dead monitor? | |
2729 return NULL; | |
2730 | |
2731 assert(dead_locals_are_killed(), "should kill locals before sync. point"); | |
2732 | |
2733 // Box the stack location | |
2734 Node* box = _gvn.transform(new (C, 1) BoxLockNode(next_monitor())); | |
2735 Node* mem = reset_memory(); | |
2736 | |
2737 FastLockNode * flock = _gvn.transform(new (C, 3) FastLockNode(0, obj, box) )->as_FastLock(); | |
2738 if (PrintPreciseBiasedLockingStatistics) { | |
2739 // Create the counters for this fast lock. | |
2740 flock->create_lock_counter(sync_jvms()); // sync_jvms used to get current bci | |
2741 } | |
2742 // Add monitor to debug info for the slow path. If we block inside the | |
2743 // slow path and de-opt, we need the monitor hanging around | |
2744 map()->push_monitor( flock ); | |
2745 | |
2746 const TypeFunc *tf = LockNode::lock_type(); | |
2747 LockNode *lock = new (C, tf->domain()->cnt()) LockNode(C, tf); | |
2748 | |
2749 lock->init_req( TypeFunc::Control, control() ); | |
2750 lock->init_req( TypeFunc::Memory , mem ); | |
2751 lock->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
2752 lock->init_req( TypeFunc::FramePtr, frameptr() ); | |
2753 lock->init_req( TypeFunc::ReturnAdr, top() ); | |
2754 | |
2755 lock->init_req(TypeFunc::Parms + 0, obj); | |
2756 lock->init_req(TypeFunc::Parms + 1, box); | |
2757 lock->init_req(TypeFunc::Parms + 2, flock); | |
2758 add_safepoint_edges(lock); | |
2759 | |
2760 lock = _gvn.transform( lock )->as_Lock(); | |
2761 | |
2762 // lock has no side-effects, sets few values | |
2763 set_predefined_output_for_runtime_call(lock, mem, TypeRawPtr::BOTTOM); | |
2764 | |
2765 insert_mem_bar(Op_MemBarAcquire); | |
2766 | |
2767 // Add this to the worklist so that the lock can be eliminated | |
2768 record_for_igvn(lock); | |
2769 | |
2770 #ifndef PRODUCT | |
2771 if (PrintLockStatistics) { | |
2772 // Update the counter for this lock. Don't bother using an atomic | |
2773 // operation since we don't require absolute accuracy. | |
2774 lock->create_lock_counter(map()->jvms()); | |
1609 | 2775 increment_counter(lock->counter()->addr()); |
0 | 2776 } |
2777 #endif | |
2778 | |
2779 return flock; | |
2780 } | |
2781 | |
2782 | |
2783 //------------------------------shared_unlock---------------------------------- | |
2784 // Emit unlocking code. | |
2785 void GraphKit::shared_unlock(Node* box, Node* obj) { | |
2786 // bci is either a monitorenter bc or InvocationEntryBci | |
2787 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces | |
2788 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); | |
2789 | |
2790 if( !GenerateSynchronizationCode ) | |
2791 return; | |
2792 if (stopped()) { // Dead monitor? | |
2793 map()->pop_monitor(); // Kill monitor from debug info | |
2794 return; | |
2795 } | |
2796 | |
2797 // Memory barrier to avoid floating things down past the locked region | |
2798 insert_mem_bar(Op_MemBarRelease); | |
2799 | |
2800 const TypeFunc *tf = OptoRuntime::complete_monitor_exit_Type(); | |
2801 UnlockNode *unlock = new (C, tf->domain()->cnt()) UnlockNode(C, tf); | |
2802 uint raw_idx = Compile::AliasIdxRaw; | |
2803 unlock->init_req( TypeFunc::Control, control() ); | |
2804 unlock->init_req( TypeFunc::Memory , memory(raw_idx) ); | |
2805 unlock->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
2806 unlock->init_req( TypeFunc::FramePtr, frameptr() ); | |
2807 unlock->init_req( TypeFunc::ReturnAdr, top() ); | |
2808 | |
2809 unlock->init_req(TypeFunc::Parms + 0, obj); | |
2810 unlock->init_req(TypeFunc::Parms + 1, box); | |
2811 unlock = _gvn.transform(unlock)->as_Unlock(); | |
2812 | |
2813 Node* mem = reset_memory(); | |
2814 | |
2815 // unlock has no side-effects, sets few values | |
2816 set_predefined_output_for_runtime_call(unlock, mem, TypeRawPtr::BOTTOM); | |
2817 | |
2818 // Kill monitor from debug info | |
2819 map()->pop_monitor( ); | |
2820 } | |
2821 | |
2822 //-------------------------------get_layout_helper----------------------------- | |
2823 // If the given klass is a constant or known to be an array, | |
2824 // fetch the constant layout helper value into constant_value | |
2825 // and return (Node*)NULL. Otherwise, load the non-constant | |
2826 // layout helper value, and return the node which represents it. | |
2827 // This two-faced routine is useful because allocation sites | |
2828 // almost always feature constant types. | |
2829 Node* GraphKit::get_layout_helper(Node* klass_node, jint& constant_value) { | |
2830 const TypeKlassPtr* inst_klass = _gvn.type(klass_node)->isa_klassptr(); | |
2831 if (!StressReflectiveCode && inst_klass != NULL) { | |
2832 ciKlass* klass = inst_klass->klass(); | |
2833 bool xklass = inst_klass->klass_is_exact(); | |
2834 if (xklass || klass->is_array_klass()) { | |
2835 jint lhelper = klass->layout_helper(); | |
2836 if (lhelper != Klass::_lh_neutral_value) { | |
2837 constant_value = lhelper; | |
2838 return (Node*) NULL; | |
2839 } | |
2840 } | |
2841 } | |
2842 constant_value = Klass::_lh_neutral_value; // put in a known value | |
2843 Node* lhp = basic_plus_adr(klass_node, klass_node, Klass::layout_helper_offset_in_bytes() + sizeof(oopDesc)); | |
2844 return make_load(NULL, lhp, TypeInt::INT, T_INT); | |
2845 } | |
2846 | |
2847 // We just put in an allocate/initialize with a big raw-memory effect. | |
2848 // Hook selected additional alias categories on the initialization. | |
2849 static void hook_memory_on_init(GraphKit& kit, int alias_idx, | |
2850 MergeMemNode* init_in_merge, | |
2851 Node* init_out_raw) { | |
2852 DEBUG_ONLY(Node* init_in_raw = init_in_merge->base_memory()); | |
2853 assert(init_in_merge->memory_at(alias_idx) == init_in_raw, ""); | |
2854 | |
2855 Node* prevmem = kit.memory(alias_idx); | |
2856 init_in_merge->set_memory_at(alias_idx, prevmem); | |
2857 kit.set_memory(init_out_raw, alias_idx); | |
2858 } | |
2859 | |
2860 //---------------------------set_output_for_allocation------------------------- | |
2861 Node* GraphKit::set_output_for_allocation(AllocateNode* alloc, | |
2862 const TypeOopPtr* oop_type, | |
2863 bool raw_mem_only) { | |
2864 int rawidx = Compile::AliasIdxRaw; | |
2865 alloc->set_req( TypeFunc::FramePtr, frameptr() ); | |
2866 add_safepoint_edges(alloc); | |
2867 Node* allocx = _gvn.transform(alloc); | |
2868 set_control( _gvn.transform(new (C, 1) ProjNode(allocx, TypeFunc::Control) ) ); | |
2869 // create memory projection for i_o | |
2870 set_memory ( _gvn.transform( new (C, 1) ProjNode(allocx, TypeFunc::Memory, true) ), rawidx ); | |
2871 make_slow_call_ex(allocx, env()->OutOfMemoryError_klass(), true); | |
2872 | |
2873 // create a memory projection as for the normal control path | |
2874 Node* malloc = _gvn.transform(new (C, 1) ProjNode(allocx, TypeFunc::Memory)); | |
2875 set_memory(malloc, rawidx); | |
2876 | |
2877 // a normal slow-call doesn't change i_o, but an allocation does | |
2878 // we create a separate i_o projection for the normal control path | |
2879 set_i_o(_gvn.transform( new (C, 1) ProjNode(allocx, TypeFunc::I_O, false) ) ); | |
2880 Node* rawoop = _gvn.transform( new (C, 1) ProjNode(allocx, TypeFunc::Parms) ); | |
2881 | |
2882 // put in an initialization barrier | |
2883 InitializeNode* init = insert_mem_bar_volatile(Op_Initialize, rawidx, | |
2884 rawoop)->as_Initialize(); | |
2885 assert(alloc->initialization() == init, "2-way macro link must work"); | |
2886 assert(init ->allocation() == alloc, "2-way macro link must work"); | |
2887 if (ReduceFieldZeroing && !raw_mem_only) { | |
2888 // Extract memory strands which may participate in the new object's | |
2889 // initialization, and source them from the new InitializeNode. | |
2890 // This will allow us to observe initializations when they occur, | |
2891 // and link them properly (as a group) to the InitializeNode. | |
2892 assert(init->in(InitializeNode::Memory) == malloc, ""); | |
2893 MergeMemNode* minit_in = MergeMemNode::make(C, malloc); | |
2894 init->set_req(InitializeNode::Memory, minit_in); | |
2895 record_for_igvn(minit_in); // fold it up later, if possible | |
2896 Node* minit_out = memory(rawidx); | |
2897 assert(minit_out->is_Proj() && minit_out->in(0) == init, ""); | |
2898 if (oop_type->isa_aryptr()) { | |
2899 const TypePtr* telemref = oop_type->add_offset(Type::OffsetBot); | |
2900 int elemidx = C->get_alias_index(telemref); | |
2901 hook_memory_on_init(*this, elemidx, minit_in, minit_out); | |
2902 } else if (oop_type->isa_instptr()) { | |
2903 ciInstanceKlass* ik = oop_type->klass()->as_instance_klass(); | |
2904 for (int i = 0, len = ik->nof_nonstatic_fields(); i < len; i++) { | |
2905 ciField* field = ik->nonstatic_field_at(i); | |
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2906 if (field->offset() >= TrackedInitializationLimit * HeapWordSize) |
0 | 2907 continue; // do not bother to track really large numbers of fields |
2908 // Find (or create) the alias category for this field: | |
2909 int fieldidx = C->alias_type(field)->index(); | |
2910 hook_memory_on_init(*this, fieldidx, minit_in, minit_out); | |
2911 } | |
2912 } | |
2913 } | |
2914 | |
2915 // Cast raw oop to the real thing... | |
2916 Node* javaoop = new (C, 2) CheckCastPPNode(control(), rawoop, oop_type); | |
2917 javaoop = _gvn.transform(javaoop); | |
2918 C->set_recent_alloc(control(), javaoop); | |
2919 assert(just_allocated_object(control()) == javaoop, "just allocated"); | |
2920 | |
2921 #ifdef ASSERT | |
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2922 { // Verify that the AllocateNode::Ideal_allocation recognizers work: |
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2923 assert(AllocateNode::Ideal_allocation(rawoop, &_gvn) == alloc, |
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2924 "Ideal_allocation works"); |
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2925 assert(AllocateNode::Ideal_allocation(javaoop, &_gvn) == alloc, |
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2926 "Ideal_allocation works"); |
0 | 2927 if (alloc->is_AllocateArray()) { |
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2928 assert(AllocateArrayNode::Ideal_array_allocation(rawoop, &_gvn) == alloc->as_AllocateArray(), |
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2929 "Ideal_allocation works"); |
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2930 assert(AllocateArrayNode::Ideal_array_allocation(javaoop, &_gvn) == alloc->as_AllocateArray(), |
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2931 "Ideal_allocation works"); |
0 | 2932 } else { |
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2933 assert(alloc->in(AllocateNode::ALength)->is_top(), "no length, please"); |
0 | 2934 } |
2935 } | |
2936 #endif //ASSERT | |
2937 | |
2938 return javaoop; | |
2939 } | |
2940 | |
2941 //---------------------------new_instance-------------------------------------- | |
2942 // This routine takes a klass_node which may be constant (for a static type) | |
2943 // or may be non-constant (for reflective code). It will work equally well | |
2944 // for either, and the graph will fold nicely if the optimizer later reduces | |
2945 // the type to a constant. | |
2946 // The optional arguments are for specialized use by intrinsics: | |
2947 // - If 'extra_slow_test' if not null is an extra condition for the slow-path. | |
2948 // - If 'raw_mem_only', do not cast the result to an oop. | |
2949 // - If 'return_size_val', report the the total object size to the caller. | |
2950 Node* GraphKit::new_instance(Node* klass_node, | |
2951 Node* extra_slow_test, | |
2952 bool raw_mem_only, // affect only raw memory | |
2953 Node* *return_size_val) { | |
2954 // Compute size in doublewords | |
2955 // The size is always an integral number of doublewords, represented | |
2956 // as a positive bytewise size stored in the klass's layout_helper. | |
2957 // The layout_helper also encodes (in a low bit) the need for a slow path. | |
2958 jint layout_con = Klass::_lh_neutral_value; | |
2959 Node* layout_val = get_layout_helper(klass_node, layout_con); | |
2960 int layout_is_con = (layout_val == NULL); | |
2961 | |
2962 if (extra_slow_test == NULL) extra_slow_test = intcon(0); | |
2963 // Generate the initial go-slow test. It's either ALWAYS (return a | |
2964 // Node for 1) or NEVER (return a NULL) or perhaps (in the reflective | |
2965 // case) a computed value derived from the layout_helper. | |
2966 Node* initial_slow_test = NULL; | |
2967 if (layout_is_con) { | |
2968 assert(!StressReflectiveCode, "stress mode does not use these paths"); | |
2969 bool must_go_slow = Klass::layout_helper_needs_slow_path(layout_con); | |
2970 initial_slow_test = must_go_slow? intcon(1): extra_slow_test; | |
2971 | |
2972 } else { // reflective case | |
2973 // This reflective path is used by Unsafe.allocateInstance. | |
2974 // (It may be stress-tested by specifying StressReflectiveCode.) | |
2975 // Basically, we want to get into the VM is there's an illegal argument. | |
2976 Node* bit = intcon(Klass::_lh_instance_slow_path_bit); | |
2977 initial_slow_test = _gvn.transform( new (C, 3) AndINode(layout_val, bit) ); | |
2978 if (extra_slow_test != intcon(0)) { | |
2979 initial_slow_test = _gvn.transform( new (C, 3) OrINode(initial_slow_test, extra_slow_test) ); | |
2980 } | |
2981 // (Macro-expander will further convert this to a Bool, if necessary.) | |
2982 } | |
2983 | |
2984 // Find the size in bytes. This is easy; it's the layout_helper. | |
2985 // The size value must be valid even if the slow path is taken. | |
2986 Node* size = NULL; | |
2987 if (layout_is_con) { | |
2988 size = MakeConX(Klass::layout_helper_size_in_bytes(layout_con)); | |
2989 } else { // reflective case | |
2990 // This reflective path is used by clone and Unsafe.allocateInstance. | |
2991 size = ConvI2X(layout_val); | |
2992 | |
2993 // Clear the low bits to extract layout_helper_size_in_bytes: | |
2994 assert((int)Klass::_lh_instance_slow_path_bit < BytesPerLong, "clear bit"); | |
2995 Node* mask = MakeConX(~ (intptr_t)right_n_bits(LogBytesPerLong)); | |
2996 size = _gvn.transform( new (C, 3) AndXNode(size, mask) ); | |
2997 } | |
2998 if (return_size_val != NULL) { | |
2999 (*return_size_val) = size; | |
3000 } | |
3001 | |
3002 // This is a precise notnull oop of the klass. | |
3003 // (Actually, it need not be precise if this is a reflective allocation.) | |
3004 // It's what we cast the result to. | |
3005 const TypeKlassPtr* tklass = _gvn.type(klass_node)->isa_klassptr(); | |
3006 if (!tklass) tklass = TypeKlassPtr::OBJECT; | |
3007 const TypeOopPtr* oop_type = tklass->as_instance_type(); | |
3008 | |
3009 // Now generate allocation code | |
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3010 |
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3011 // The entire memory state is needed for slow path of the allocation |
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3012 // since GC and deoptimization can happened. |
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3013 Node *mem = reset_memory(); |
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3014 set_all_memory(mem); // Create new memory state |
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3015 |
0 | 3016 AllocateNode* alloc |
3017 = new (C, AllocateNode::ParmLimit) | |
3018 AllocateNode(C, AllocateNode::alloc_type(), | |
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3019 control(), mem, i_o(), |
0 | 3020 size, klass_node, |
3021 initial_slow_test); | |
3022 | |
3023 return set_output_for_allocation(alloc, oop_type, raw_mem_only); | |
3024 } | |
3025 | |
3026 //-------------------------------new_array------------------------------------- | |
3027 // helper for both newarray and anewarray | |
3028 // The 'length' parameter is (obviously) the length of the array. | |
3029 // See comments on new_instance for the meaning of the other arguments. | |
3030 Node* GraphKit::new_array(Node* klass_node, // array klass (maybe variable) | |
3031 Node* length, // number of array elements | |
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3032 int nargs, // number of arguments to push back for uncommon trap |
0 | 3033 bool raw_mem_only, // affect only raw memory |
3034 Node* *return_size_val) { | |
3035 jint layout_con = Klass::_lh_neutral_value; | |
3036 Node* layout_val = get_layout_helper(klass_node, layout_con); | |
3037 int layout_is_con = (layout_val == NULL); | |
3038 | |
3039 if (!layout_is_con && !StressReflectiveCode && | |
3040 !too_many_traps(Deoptimization::Reason_class_check)) { | |
3041 // This is a reflective array creation site. | |
3042 // Optimistically assume that it is a subtype of Object[], | |
3043 // so that we can fold up all the address arithmetic. | |
3044 layout_con = Klass::array_layout_helper(T_OBJECT); | |
3045 Node* cmp_lh = _gvn.transform( new(C, 3) CmpINode(layout_val, intcon(layout_con)) ); | |
3046 Node* bol_lh = _gvn.transform( new(C, 2) BoolNode(cmp_lh, BoolTest::eq) ); | |
3047 { BuildCutout unless(this, bol_lh, PROB_MAX); | |
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3048 _sp += nargs; |
0 | 3049 uncommon_trap(Deoptimization::Reason_class_check, |
3050 Deoptimization::Action_maybe_recompile); | |
3051 } | |
3052 layout_val = NULL; | |
3053 layout_is_con = true; | |
3054 } | |
3055 | |
3056 // Generate the initial go-slow test. Make sure we do not overflow | |
3057 // if length is huge (near 2Gig) or negative! We do not need | |
3058 // exact double-words here, just a close approximation of needed | |
3059 // double-words. We can't add any offset or rounding bits, lest we | |
3060 // take a size -1 of bytes and make it positive. Use an unsigned | |
3061 // compare, so negative sizes look hugely positive. | |
3062 int fast_size_limit = FastAllocateSizeLimit; | |
3063 if (layout_is_con) { | |
3064 assert(!StressReflectiveCode, "stress mode does not use these paths"); | |
3065 // Increase the size limit if we have exact knowledge of array type. | |
3066 int log2_esize = Klass::layout_helper_log2_element_size(layout_con); | |
3067 fast_size_limit <<= (LogBytesPerLong - log2_esize); | |
3068 } | |
3069 | |
3070 Node* initial_slow_cmp = _gvn.transform( new (C, 3) CmpUNode( length, intcon( fast_size_limit ) ) ); | |
3071 Node* initial_slow_test = _gvn.transform( new (C, 2) BoolNode( initial_slow_cmp, BoolTest::gt ) ); | |
3072 if (initial_slow_test->is_Bool()) { | |
3073 // Hide it behind a CMoveI, or else PhaseIdealLoop::split_up will get sick. | |
3074 initial_slow_test = initial_slow_test->as_Bool()->as_int_value(&_gvn); | |
3075 } | |
3076 | |
3077 // --- Size Computation --- | |
3078 // array_size = round_to_heap(array_header + (length << elem_shift)); | |
3079 // where round_to_heap(x) == round_to(x, MinObjAlignmentInBytes) | |
3080 // and round_to(x, y) == ((x + y-1) & ~(y-1)) | |
3081 // The rounding mask is strength-reduced, if possible. | |
3082 int round_mask = MinObjAlignmentInBytes - 1; | |
3083 Node* header_size = NULL; | |
3084 int header_size_min = arrayOopDesc::base_offset_in_bytes(T_BYTE); | |
3085 // (T_BYTE has the weakest alignment and size restrictions...) | |
3086 if (layout_is_con) { | |
3087 int hsize = Klass::layout_helper_header_size(layout_con); | |
3088 int eshift = Klass::layout_helper_log2_element_size(layout_con); | |
3089 BasicType etype = Klass::layout_helper_element_type(layout_con); | |
3090 if ((round_mask & ~right_n_bits(eshift)) == 0) | |
3091 round_mask = 0; // strength-reduce it if it goes away completely | |
3092 assert((hsize & right_n_bits(eshift)) == 0, "hsize is pre-rounded"); | |
3093 assert(header_size_min <= hsize, "generic minimum is smallest"); | |
3094 header_size_min = hsize; | |
3095 header_size = intcon(hsize + round_mask); | |
3096 } else { | |
3097 Node* hss = intcon(Klass::_lh_header_size_shift); | |
3098 Node* hsm = intcon(Klass::_lh_header_size_mask); | |
3099 Node* hsize = _gvn.transform( new(C, 3) URShiftINode(layout_val, hss) ); | |
3100 hsize = _gvn.transform( new(C, 3) AndINode(hsize, hsm) ); | |
3101 Node* mask = intcon(round_mask); | |
3102 header_size = _gvn.transform( new(C, 3) AddINode(hsize, mask) ); | |
3103 } | |
3104 | |
3105 Node* elem_shift = NULL; | |
3106 if (layout_is_con) { | |
3107 int eshift = Klass::layout_helper_log2_element_size(layout_con); | |
3108 if (eshift != 0) | |
3109 elem_shift = intcon(eshift); | |
3110 } else { | |
3111 // There is no need to mask or shift this value. | |
3112 // The semantics of LShiftINode include an implicit mask to 0x1F. | |
3113 assert(Klass::_lh_log2_element_size_shift == 0, "use shift in place"); | |
3114 elem_shift = layout_val; | |
3115 } | |
3116 | |
3117 // Transition to native address size for all offset calculations: | |
3118 Node* lengthx = ConvI2X(length); | |
3119 Node* headerx = ConvI2X(header_size); | |
3120 #ifdef _LP64 | |
3121 { const TypeLong* tllen = _gvn.find_long_type(lengthx); | |
3122 if (tllen != NULL && tllen->_lo < 0) { | |
3123 // Add a manual constraint to a positive range. Cf. array_element_address. | |
3124 jlong size_max = arrayOopDesc::max_array_length(T_BYTE); | |
3125 if (size_max > tllen->_hi) size_max = tllen->_hi; | |
3126 const TypeLong* tlcon = TypeLong::make(CONST64(0), size_max, Type::WidenMin); | |
3127 lengthx = _gvn.transform( new (C, 2) ConvI2LNode(length, tlcon)); | |
3128 } | |
3129 } | |
3130 #endif | |
3131 | |
3132 // Combine header size (plus rounding) and body size. Then round down. | |
3133 // This computation cannot overflow, because it is used only in two | |
3134 // places, one where the length is sharply limited, and the other | |
3135 // after a successful allocation. | |
3136 Node* abody = lengthx; | |
3137 if (elem_shift != NULL) | |
3138 abody = _gvn.transform( new(C, 3) LShiftXNode(lengthx, elem_shift) ); | |
3139 Node* size = _gvn.transform( new(C, 3) AddXNode(headerx, abody) ); | |
3140 if (round_mask != 0) { | |
3141 Node* mask = MakeConX(~round_mask); | |
3142 size = _gvn.transform( new(C, 3) AndXNode(size, mask) ); | |
3143 } | |
3144 // else if round_mask == 0, the size computation is self-rounding | |
3145 | |
3146 if (return_size_val != NULL) { | |
3147 // This is the size | |
3148 (*return_size_val) = size; | |
3149 } | |
3150 | |
3151 // Now generate allocation code | |
74
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3152 |
565
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|
3153 // The entire memory state is needed for slow path of the allocation |
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|
3154 // since GC and deoptimization can happened. |
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|
3155 Node *mem = reset_memory(); |
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|
3156 set_all_memory(mem); // Create new memory state |
74
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3157 |
0 | 3158 // Create the AllocateArrayNode and its result projections |
3159 AllocateArrayNode* alloc | |
3160 = new (C, AllocateArrayNode::ParmLimit) | |
3161 AllocateArrayNode(C, AllocateArrayNode::alloc_type(), | |
74
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3162 control(), mem, i_o(), |
0 | 3163 size, klass_node, |
3164 initial_slow_test, | |
3165 length); | |
3166 | |
3167 // Cast to correct type. Note that the klass_node may be constant or not, | |
3168 // and in the latter case the actual array type will be inexact also. | |
3169 // (This happens via a non-constant argument to inline_native_newArray.) | |
3170 // In any case, the value of klass_node provides the desired array type. | |
3171 const TypeInt* length_type = _gvn.find_int_type(length); | |
3172 const TypeOopPtr* ary_type = _gvn.type(klass_node)->is_klassptr()->as_instance_type(); | |
3173 if (ary_type->isa_aryptr() && length_type != NULL) { | |
3174 // Try to get a better type than POS for the size | |
3175 ary_type = ary_type->is_aryptr()->cast_to_size(length_type); | |
3176 } | |
3177 | |
3178 Node* javaoop = set_output_for_allocation(alloc, ary_type, raw_mem_only); | |
3179 | |
366
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3180 // Cast length on remaining path to be as narrow as possible |
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3181 if (map()->find_edge(length) >= 0) { |
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3182 Node* ccast = alloc->make_ideal_length(ary_type, &_gvn); |
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3183 if (ccast != length) { |
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3184 _gvn.set_type_bottom(ccast); |
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3185 record_for_igvn(ccast); |
0 | 3186 replace_in_map(length, ccast); |
3187 } | |
3188 } | |
3189 | |
3190 return javaoop; | |
3191 } | |
3192 | |
3193 // The following "Ideal_foo" functions are placed here because they recognize | |
3194 // the graph shapes created by the functions immediately above. | |
3195 | |
3196 //---------------------------Ideal_allocation---------------------------------- | |
3197 // Given an oop pointer or raw pointer, see if it feeds from an AllocateNode. | |
3198 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase) { | |
3199 if (ptr == NULL) { // reduce dumb test in callers | |
3200 return NULL; | |
3201 } | |
3202 if (ptr->is_CheckCastPP()) { // strip a raw-to-oop cast | |
3203 ptr = ptr->in(1); | |
3204 if (ptr == NULL) return NULL; | |
3205 } | |
3206 if (ptr->is_Proj()) { | |
3207 Node* allo = ptr->in(0); | |
3208 if (allo != NULL && allo->is_Allocate()) { | |
3209 return allo->as_Allocate(); | |
3210 } | |
3211 } | |
3212 // Report failure to match. | |
3213 return NULL; | |
3214 } | |
3215 | |
3216 // Fancy version which also strips off an offset (and reports it to caller). | |
3217 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase, | |
3218 intptr_t& offset) { | |
3219 Node* base = AddPNode::Ideal_base_and_offset(ptr, phase, offset); | |
3220 if (base == NULL) return NULL; | |
3221 return Ideal_allocation(base, phase); | |
3222 } | |
3223 | |
3224 // Trace Initialize <- Proj[Parm] <- Allocate | |
3225 AllocateNode* InitializeNode::allocation() { | |
3226 Node* rawoop = in(InitializeNode::RawAddress); | |
3227 if (rawoop->is_Proj()) { | |
3228 Node* alloc = rawoop->in(0); | |
3229 if (alloc->is_Allocate()) { | |
3230 return alloc->as_Allocate(); | |
3231 } | |
3232 } | |
3233 return NULL; | |
3234 } | |
3235 | |
3236 // Trace Allocate -> Proj[Parm] -> Initialize | |
3237 InitializeNode* AllocateNode::initialization() { | |
3238 ProjNode* rawoop = proj_out(AllocateNode::RawAddress); | |
3239 if (rawoop == NULL) return NULL; | |
3240 for (DUIterator_Fast imax, i = rawoop->fast_outs(imax); i < imax; i++) { | |
3241 Node* init = rawoop->fast_out(i); | |
3242 if (init->is_Initialize()) { | |
3243 assert(init->as_Initialize()->allocation() == this, "2-way link"); | |
3244 return init->as_Initialize(); | |
3245 } | |
3246 } | |
3247 return NULL; | |
3248 } | |
342
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3249 |
851
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3250 //----------------------------- store barriers ---------------------------- |
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3251 #define __ ideal. |
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3252 |
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3253 void GraphKit::sync_kit(IdealKit& ideal) { |
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3254 // Final sync IdealKit and graphKit. |
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3255 __ drain_delay_transform(); |
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3256 set_all_memory(__ merged_memory()); |
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3257 set_control(__ ctrl()); |
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|
3258 } |
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|
3259 |
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3260 // vanilla/CMS post barrier |
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3261 // Insert a write-barrier store. This is to let generational GC work; we have |
fc4be448891f
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3262 // to flag all oop-stores before the next GC point. |
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3263 void GraphKit::write_barrier_post(Node* oop_store, |
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|
3264 Node* obj, |
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|
3265 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
|
3266 uint adr_idx, |
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3267 Node* val, |
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|
3268 bool use_precise) { |
fc4be448891f
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|
3269 // No store check needed if we're storing a NULL or an old object |
fc4be448891f
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|
3270 // (latter case is probably a string constant). The concurrent |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3271 // mark sweep garbage collector, however, needs to have all nonNull |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3272 // oop updates flagged via card-marks. |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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3273 if (val != NULL && val->is_Con()) { |
fc4be448891f
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|
3274 // must be either an oop or NULL |
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|
3275 const Type* t = val->bottom_type(); |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3276 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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|
3277 // stores of null never (?) need barriers |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3278 return; |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3279 ciObject* con = t->is_oopptr()->const_oop(); |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3280 if (con != NULL |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3281 && con->is_perm() |
fc4be448891f
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|
3282 && Universe::heap()->can_elide_permanent_oop_store_barriers()) |
fc4be448891f
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|
3283 // no store barrier needed, because no old-to-new ref created |
fc4be448891f
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|
3284 return; |
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|
3285 } |
fc4be448891f
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diff
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|
3286 |
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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985
diff
changeset
|
3287 if (use_ReduceInitialCardMarks() |
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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985
diff
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|
3288 && obj == just_allocated_object(control())) { |
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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985
diff
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|
3289 // We can skip marks on a freshly-allocated object in Eden. |
1166 | 3290 // Keep this code in sync with new_store_pre_barrier() in runtime.cpp. |
3291 // That routine informs GC to take appropriate compensating steps, | |
3292 // upon a slow-path allocation, so as to make this card-mark | |
3293 // elision safe. | |
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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985
diff
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|
3294 return; |
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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parents:
985
diff
changeset
|
3295 } |
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
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985
diff
changeset
|
3296 |
851
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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diff
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|
3297 if (!use_precise) { |
fc4be448891f
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|
3298 // All card marks for a (non-array) instance are in one place: |
fc4be448891f
6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3299 adr = obj; |
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|
3300 } |
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|
3301 // (Else it's an array (or unknown), and we want more precise card marks.) |
fc4be448891f
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|
3302 assert(adr != NULL, ""); |
fc4be448891f
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|
3303 |
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|
3304 IdealKit ideal(gvn(), control(), merged_memory(), true); |
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|
3305 |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3306 // Convert the pointer to an int prior to doing math on it |
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|
3307 Node* cast = __ CastPX(__ ctrl(), adr); |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3308 |
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6851742: (EA) allocation elimination doesn't work with UseG1GC
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|
3309 // Divide by card size |
fc4be448891f
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|
3310 assert(Universe::heap()->barrier_set()->kind() == BarrierSet::CardTableModRef, |
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|
3311 "Only one we handle so far."); |
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|
3312 Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) ); |
fc4be448891f
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3313 |
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3314 // Combine card table base and card offset |
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3315 Node* card_adr = __ AddP(__ top(), byte_map_base_node(), card_offset ); |
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3316 |
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3317 // Get the alias_index for raw card-mark memory |
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3318 int adr_type = Compile::AliasIdxRaw; |
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3319 // Smash zero into card |
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3320 Node* zero = __ ConI(0); |
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3321 BasicType bt = T_BYTE; |
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3322 if( !UseConcMarkSweepGC ) { |
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3323 __ store(__ ctrl(), card_adr, zero, bt, adr_type); |
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3324 } else { |
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3325 // Specialized path for CM store barrier |
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3326 __ storeCM(__ ctrl(), card_adr, zero, oop_store, adr_idx, bt, adr_type); |
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3327 } |
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3328 |
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3329 // Final sync IdealKit and GraphKit. |
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3330 sync_kit(ideal); |
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3331 } |
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3332 |
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3333 // G1 pre/post barriers |
342
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3334 void GraphKit::g1_write_barrier_pre(Node* obj, |
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3335 Node* adr, |
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3336 uint alias_idx, |
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3337 Node* val, |
825 | 3338 const TypeOopPtr* val_type, |
342
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3339 BasicType bt) { |
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3340 IdealKit ideal(gvn(), control(), merged_memory(), true); |
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3341 |
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3342 Node* tls = __ thread(); // ThreadLocalStorage |
342
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3343 |
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3344 Node* no_ctrl = NULL; |
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3345 Node* no_base = __ top(); |
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3346 Node* zero = __ ConI(0); |
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3347 |
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3348 float likely = PROB_LIKELY(0.999); |
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3349 float unlikely = PROB_UNLIKELY(0.999); |
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3350 |
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3351 BasicType active_type = in_bytes(PtrQueue::byte_width_of_active()) == 4 ? T_INT : T_BYTE; |
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3352 assert(in_bytes(PtrQueue::byte_width_of_active()) == 4 || in_bytes(PtrQueue::byte_width_of_active()) == 1, "flag width"); |
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3353 |
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3354 // Offsets into the thread |
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3355 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 648 |
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3356 PtrQueue::byte_offset_of_active()); |
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3357 const int index_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 656 |
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3358 PtrQueue::byte_offset_of_index()); |
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3359 const int buffer_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 652 |
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3360 PtrQueue::byte_offset_of_buf()); |
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3361 // Now the actual pointers into the thread |
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3362 |
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3363 // set_control( ctl); |
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3364 |
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3365 Node* marking_adr = __ AddP(no_base, tls, __ ConX(marking_offset)); |
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3366 Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset)); |
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3367 Node* index_adr = __ AddP(no_base, tls, __ ConX(index_offset)); |
342
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3368 |
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3369 // Now some of the values |
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3370 |
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3371 Node* marking = __ load(__ ctrl(), marking_adr, TypeInt::INT, active_type, Compile::AliasIdxRaw); |
342
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3372 |
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3373 // if (!marking) |
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3374 __ if_then(marking, BoolTest::ne, zero); { |
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3375 Node* index = __ load(__ ctrl(), index_adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw); |
342
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3376 |
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3377 const Type* t1 = adr->bottom_type(); |
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3378 const Type* t2 = val->bottom_type(); |
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3379 |
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3380 Node* orig = __ load(no_ctrl, adr, val_type, bt, alias_idx); |
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3381 // if (orig != NULL) |
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3382 __ if_then(orig, BoolTest::ne, null()); { |
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3383 Node* buffer = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw); |
342
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3384 |
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|
3385 // load original value |
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|
3386 // alias_idx correct?? |
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|
3387 |
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3388 // is the queue for this thread full? |
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3389 __ if_then(index, BoolTest::ne, zero, likely); { |
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3390 |
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3391 // decrement the index |
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3392 Node* next_index = __ SubI(index, __ ConI(sizeof(intptr_t))); |
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3393 Node* next_indexX = next_index; |
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|
3394 #ifdef _LP64 |
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3395 // We could refine the type for what it's worth |
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3396 // const TypeLong* lidxtype = TypeLong::make(CONST64(0), get_size_from_queue); |
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3397 next_indexX = _gvn.transform( new (C, 2) ConvI2LNode(next_index, TypeLong::make(0, max_jlong, Type::WidenMax)) ); |
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3398 #endif |
342
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3399 |
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3400 // Now get the buffer location we will log the original value into and store it |
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3401 Node *log_addr = __ AddP(no_base, buffer, next_indexX); |
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3402 __ store(__ ctrl(), log_addr, orig, T_OBJECT, Compile::AliasIdxRaw); |
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3403 |
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3404 // update the index |
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3405 __ store(__ ctrl(), index_adr, next_index, T_INT, Compile::AliasIdxRaw); |
342
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3406 |
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3407 } __ else_(); { |
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3408 |
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3409 // logging buffer is full, call the runtime |
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3410 const TypeFunc *tf = OptoRuntime::g1_wb_pre_Type(); |
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3411 __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), "g1_wb_pre", orig, tls); |
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3412 } __ end_if(); // (!index) |
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3413 } __ end_if(); // (orig != NULL) |
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3414 } __ end_if(); // (!marking) |
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3415 |
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3416 // Final sync IdealKit and GraphKit. |
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3417 sync_kit(ideal); |
342
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3418 } |
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3419 |
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3420 // |
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3421 // Update the card table and add card address to the queue |
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3422 // |
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3423 void GraphKit::g1_mark_card(IdealKit& ideal, |
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3424 Node* card_adr, |
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3425 Node* oop_store, |
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3426 uint oop_alias_idx, |
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3427 Node* index, |
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3428 Node* index_adr, |
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3429 Node* buffer, |
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3430 const TypeFunc* tf) { |
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3431 |
342
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3432 Node* zero = __ ConI(0); |
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3433 Node* no_base = __ top(); |
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3434 BasicType card_bt = T_BYTE; |
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3435 // Smash zero into card. MUST BE ORDERED WRT TO STORE |
985
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3436 __ storeCM(__ ctrl(), card_adr, zero, oop_store, oop_alias_idx, card_bt, Compile::AliasIdxRaw); |
342
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3437 |
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3438 // Now do the queue work |
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3439 __ if_then(index, BoolTest::ne, zero); { |
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3440 |
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3441 Node* next_index = __ SubI(index, __ ConI(sizeof(intptr_t))); |
342
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3442 Node* next_indexX = next_index; |
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3443 #ifdef _LP64 |
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3444 // We could refine the type for what it's worth |
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3445 // const TypeLong* lidxtype = TypeLong::make(CONST64(0), get_size_from_queue); |
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3446 next_indexX = _gvn.transform( new (C, 2) ConvI2LNode(next_index, TypeLong::make(0, max_jlong, Type::WidenMax)) ); |
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3447 #endif // _LP64 |
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3448 Node* log_addr = __ AddP(no_base, buffer, next_indexX); |
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3449 |
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3450 __ store(__ ctrl(), log_addr, card_adr, T_ADDRESS, Compile::AliasIdxRaw); |
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3451 __ store(__ ctrl(), index_adr, next_index, T_INT, Compile::AliasIdxRaw); |
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3452 |
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3453 } __ else_(); { |
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3454 __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), "g1_wb_post", card_adr, __ thread()); |
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3455 } __ end_if(); |
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3456 |
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3457 } |
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3458 |
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3459 void GraphKit::g1_write_barrier_post(Node* oop_store, |
342
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3460 Node* obj, |
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3461 Node* adr, |
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3462 uint alias_idx, |
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3463 Node* val, |
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3464 BasicType bt, |
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3465 bool use_precise) { |
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3466 // If we are writing a NULL then we need no post barrier |
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3467 |
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3468 if (val != NULL && val->is_Con() && val->bottom_type() == TypePtr::NULL_PTR) { |
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3469 // Must be NULL |
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3470 const Type* t = val->bottom_type(); |
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3471 assert(t == Type::TOP || t == TypePtr::NULL_PTR, "must be NULL"); |
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3472 // No post barrier if writing NULLx |
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3473 return; |
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3474 } |
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3475 |
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3476 if (!use_precise) { |
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3477 // All card marks for a (non-array) instance are in one place: |
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3478 adr = obj; |
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3479 } |
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3480 // (Else it's an array (or unknown), and we want more precise card marks.) |
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3481 assert(adr != NULL, ""); |
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3482 |
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3483 IdealKit ideal(gvn(), control(), merged_memory(), true); |
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3484 |
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3485 Node* tls = __ thread(); // ThreadLocalStorage |
342
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3486 |
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3487 Node* no_base = __ top(); |
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3488 float likely = PROB_LIKELY(0.999); |
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3489 float unlikely = PROB_UNLIKELY(0.999); |
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3490 Node* zero = __ ConI(0); |
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3491 Node* zeroX = __ ConX(0); |
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3492 |
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3493 // Get the alias_index for raw card-mark memory |
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3494 const TypePtr* card_type = TypeRawPtr::BOTTOM; |
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3495 |
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3496 const TypeFunc *tf = OptoRuntime::g1_wb_post_Type(); |
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3497 |
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3498 // Offsets into the thread |
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3499 const int index_offset = in_bytes(JavaThread::dirty_card_queue_offset() + |
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3500 PtrQueue::byte_offset_of_index()); |
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3501 const int buffer_offset = in_bytes(JavaThread::dirty_card_queue_offset() + |
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3502 PtrQueue::byte_offset_of_buf()); |
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3503 |
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3504 // Pointers into the thread |
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3505 |
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3506 Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset)); |
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3507 Node* index_adr = __ AddP(no_base, tls, __ ConX(index_offset)); |
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3508 |
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3509 // Now some values |
1593
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|
3510 // Use ctrl to avoid hoisting these values past a safepoint, which could |
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|
3511 // potentially reset these fields in the JavaThread. |
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|
3512 Node* index = __ load(__ ctrl(), index_adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw); |
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3513 Node* buffer = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw); |
342
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3514 |
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3515 // Convert the store obj pointer to an int prior to doing math on it |
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3516 // Must use ctrl to prevent "integerized oop" existing across safepoint |
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3517 Node* cast = __ CastPX(__ ctrl(), adr); |
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3518 |
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3519 // Divide pointer by card size |
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3520 Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) ); |
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3521 |
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3522 // Combine card table base and card offset |
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3523 Node* card_adr = __ AddP(no_base, byte_map_base_node(), card_offset ); |
342
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3524 |
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3525 // If we know the value being stored does it cross regions? |
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3526 |
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3527 if (val != NULL) { |
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3528 // Does the store cause us to cross regions? |
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|
3529 |
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3530 // Should be able to do an unsigned compare of region_size instead of |
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3531 // and extra shift. Do we have an unsigned compare?? |
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3532 // Node* region_size = __ ConI(1 << HeapRegion::LogOfHRGrainBytes); |
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3533 Node* xor_res = __ URShiftX ( __ XorX( cast, __ CastPX(__ ctrl(), val)), __ ConI(HeapRegion::LogOfHRGrainBytes)); |
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3534 |
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3535 // if (xor_res == 0) same region so skip |
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3536 __ if_then(xor_res, BoolTest::ne, zeroX); { |
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3537 |
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3538 // No barrier if we are storing a NULL |
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3539 __ if_then(val, BoolTest::ne, null(), unlikely); { |
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3540 |
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3541 // Ok must mark the card if not already dirty |
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|
3542 |
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3543 // load the original value of the card |
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3544 Node* card_val = __ load(__ ctrl(), card_adr, TypeInt::INT, T_BYTE, Compile::AliasIdxRaw); |
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3545 |
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3546 __ if_then(card_val, BoolTest::ne, zero); { |
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3547 g1_mark_card(ideal, card_adr, oop_store, alias_idx, index, index_adr, buffer, tf); |
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3548 } __ end_if(); |
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3549 } __ end_if(); |
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3550 } __ end_if(); |
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3551 } else { |
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3552 // Object.clone() instrinsic uses this path. |
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3553 g1_mark_card(ideal, card_adr, oop_store, alias_idx, index, index_adr, buffer, tf); |
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3554 } |
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3555 |
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3556 // Final sync IdealKit and GraphKit. |
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3557 sync_kit(ideal); |
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3558 } |
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3559 #undef __ |