1 /*
2 * Copyright (c) 2001, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/ciUtilities.hpp"
27 #include "compiler/compileLog.hpp"
28 #include "ci/ciValueKlass.hpp"
29 #include "gc/shared/barrierSet.hpp"
30 #include "gc/shared/c2/barrierSetC2.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "opto/addnode.hpp"
34 #include "opto/castnode.hpp"
35 #include "opto/convertnode.hpp"
36 #include "opto/graphKit.hpp"
37 #include "opto/idealKit.hpp"
38 #include "opto/intrinsicnode.hpp"
39 #include "opto/locknode.hpp"
40 #include "opto/machnode.hpp"
41 #include "opto/narrowptrnode.hpp"
42 #include "opto/opaquenode.hpp"
43 #include "opto/parse.hpp"
44 #include "opto/rootnode.hpp"
45 #include "opto/runtime.hpp"
46 #include "opto/valuetypenode.hpp"
47 #include "runtime/deoptimization.hpp"
48 #include "runtime/sharedRuntime.hpp"
49
50 //----------------------------GraphKit-----------------------------------------
51 // Main utility constructor.
52 GraphKit::GraphKit(JVMState* jvms, PhaseGVN* gvn)
53 : Phase(Phase::Parser),
54 _env(C->env()),
55 _gvn((gvn != NULL) ? *gvn : *C->initial_gvn()),
56 _barrier_set(BarrierSet::barrier_set()->barrier_set_c2())
57 {
58 assert(gvn == NULL || !gvn->is_IterGVN() || gvn->is_IterGVN()->delay_transform(), "delay transform should be enabled");
59 _exceptions = jvms->map()->next_exception();
60 if (_exceptions != NULL) jvms->map()->set_next_exception(NULL);
61 set_jvms(jvms);
62 #ifdef ASSERT
63 if (_gvn.is_IterGVN() != NULL) {
64 assert(_gvn.is_IterGVN()->delay_transform(), "Transformation must be delayed if IterGVN is used");
65 // Save the initial size of _for_igvn worklist for verification (see ~GraphKit)
66 _worklist_size = _gvn.C->for_igvn()->size();
67 }
68 #endif
69 }
70
71 // Private constructor for parser.
72 GraphKit::GraphKit()
73 : Phase(Phase::Parser),
74 _env(C->env()),
75 _gvn(*C->initial_gvn()),
76 _barrier_set(BarrierSet::barrier_set()->barrier_set_c2())
77 {
78 _exceptions = NULL;
79 set_map(NULL);
80 debug_only(_sp = -99);
81 debug_only(set_bci(-99));
82 }
83
84
85
86 //---------------------------clean_stack---------------------------------------
87 // Clear away rubbish from the stack area of the JVM state.
88 // This destroys any arguments that may be waiting on the stack.
89 void GraphKit::clean_stack(int from_sp) {
90 SafePointNode* map = this->map();
91 JVMState* jvms = this->jvms();
92 int stk_size = jvms->stk_size();
93 int stkoff = jvms->stkoff();
94 Node* top = this->top();
95 for (int i = from_sp; i < stk_size; i++) {
96 if (map->in(stkoff + i) != top) {
97 map->set_req(stkoff + i, top);
98 }
99 }
100 }
101
102
103 //--------------------------------sync_jvms-----------------------------------
104 // Make sure our current jvms agrees with our parse state.
105 JVMState* GraphKit::sync_jvms() const {
106 JVMState* jvms = this->jvms();
107 jvms->set_bci(bci()); // Record the new bci in the JVMState
108 jvms->set_sp(sp()); // Record the new sp in the JVMState
109 assert(jvms_in_sync(), "jvms is now in sync");
110 return jvms;
111 }
112
113 //--------------------------------sync_jvms_for_reexecute---------------------
114 // Make sure our current jvms agrees with our parse state. This version
115 // uses the reexecute_sp for reexecuting bytecodes.
116 JVMState* GraphKit::sync_jvms_for_reexecute() {
117 JVMState* jvms = this->jvms();
118 jvms->set_bci(bci()); // Record the new bci in the JVMState
119 jvms->set_sp(reexecute_sp()); // Record the new sp in the JVMState
120 return jvms;
121 }
122
123 #ifdef ASSERT
124 bool GraphKit::jvms_in_sync() const {
125 Parse* parse = is_Parse();
126 if (parse == NULL) {
127 if (bci() != jvms()->bci()) return false;
128 if (sp() != (int)jvms()->sp()) return false;
129 return true;
130 }
131 if (jvms()->method() != parse->method()) return false;
132 if (jvms()->bci() != parse->bci()) return false;
133 int jvms_sp = jvms()->sp();
134 if (jvms_sp != parse->sp()) return false;
135 int jvms_depth = jvms()->depth();
136 if (jvms_depth != parse->depth()) return false;
137 return true;
138 }
139
140 // Local helper checks for special internal merge points
141 // used to accumulate and merge exception states.
142 // They are marked by the region's in(0) edge being the map itself.
143 // Such merge points must never "escape" into the parser at large,
144 // until they have been handed to gvn.transform.
145 static bool is_hidden_merge(Node* reg) {
146 if (reg == NULL) return false;
147 if (reg->is_Phi()) {
148 reg = reg->in(0);
149 if (reg == NULL) return false;
150 }
151 return reg->is_Region() && reg->in(0) != NULL && reg->in(0)->is_Root();
152 }
153
154 void GraphKit::verify_map() const {
155 if (map() == NULL) return; // null map is OK
156 assert(map()->req() <= jvms()->endoff(), "no extra garbage on map");
157 assert(!map()->has_exceptions(), "call add_exception_states_from 1st");
158 assert(!is_hidden_merge(control()), "call use_exception_state, not set_map");
159 }
160
161 void GraphKit::verify_exception_state(SafePointNode* ex_map) {
162 assert(ex_map->next_exception() == NULL, "not already part of a chain");
163 assert(has_saved_ex_oop(ex_map), "every exception state has an ex_oop");
164 }
165 #endif
166
167 //---------------------------stop_and_kill_map---------------------------------
168 // Set _map to NULL, signalling a stop to further bytecode execution.
169 // First smash the current map's control to a constant, to mark it dead.
170 void GraphKit::stop_and_kill_map() {
171 SafePointNode* dead_map = stop();
172 if (dead_map != NULL) {
173 dead_map->disconnect_inputs(NULL, C); // Mark the map as killed.
174 assert(dead_map->is_killed(), "must be so marked");
175 }
176 }
177
178
179 //--------------------------------stopped--------------------------------------
180 // Tell if _map is NULL, or control is top.
181 bool GraphKit::stopped() {
182 if (map() == NULL) return true;
183 else if (control() == top()) return true;
184 else return false;
185 }
186
187
188 //-----------------------------has_ex_handler----------------------------------
189 // Tell if this method or any caller method has exception handlers.
190 bool GraphKit::has_ex_handler() {
191 for (JVMState* jvmsp = jvms(); jvmsp != NULL; jvmsp = jvmsp->caller()) {
192 if (jvmsp->has_method() && jvmsp->method()->has_exception_handlers()) {
193 return true;
194 }
195 }
196 return false;
197 }
198
199 //------------------------------save_ex_oop------------------------------------
200 // Save an exception without blowing stack contents or other JVM state.
201 void GraphKit::set_saved_ex_oop(SafePointNode* ex_map, Node* ex_oop) {
202 assert(!has_saved_ex_oop(ex_map), "clear ex-oop before setting again");
203 ex_map->add_req(ex_oop);
204 debug_only(verify_exception_state(ex_map));
205 }
206
207 inline static Node* common_saved_ex_oop(SafePointNode* ex_map, bool clear_it) {
208 assert(GraphKit::has_saved_ex_oop(ex_map), "ex_oop must be there");
209 Node* ex_oop = ex_map->in(ex_map->req()-1);
210 if (clear_it) ex_map->del_req(ex_map->req()-1);
211 return ex_oop;
212 }
213
214 //-----------------------------saved_ex_oop------------------------------------
215 // Recover a saved exception from its map.
216 Node* GraphKit::saved_ex_oop(SafePointNode* ex_map) {
217 return common_saved_ex_oop(ex_map, false);
218 }
219
220 //--------------------------clear_saved_ex_oop---------------------------------
221 // Erase a previously saved exception from its map.
222 Node* GraphKit::clear_saved_ex_oop(SafePointNode* ex_map) {
223 return common_saved_ex_oop(ex_map, true);
224 }
225
226 #ifdef ASSERT
227 //---------------------------has_saved_ex_oop----------------------------------
228 // Erase a previously saved exception from its map.
229 bool GraphKit::has_saved_ex_oop(SafePointNode* ex_map) {
230 return ex_map->req() == ex_map->jvms()->endoff()+1;
231 }
232 #endif
233
234 //-------------------------make_exception_state--------------------------------
235 // Turn the current JVM state into an exception state, appending the ex_oop.
236 SafePointNode* GraphKit::make_exception_state(Node* ex_oop) {
237 sync_jvms();
238 SafePointNode* ex_map = stop(); // do not manipulate this map any more
239 set_saved_ex_oop(ex_map, ex_oop);
240 return ex_map;
241 }
242
243
244 //--------------------------add_exception_state--------------------------------
245 // Add an exception to my list of exceptions.
246 void GraphKit::add_exception_state(SafePointNode* ex_map) {
247 if (ex_map == NULL || ex_map->control() == top()) {
248 return;
249 }
250 #ifdef ASSERT
251 verify_exception_state(ex_map);
252 if (has_exceptions()) {
253 assert(ex_map->jvms()->same_calls_as(_exceptions->jvms()), "all collected exceptions must come from the same place");
254 }
255 #endif
256
257 // If there is already an exception of exactly this type, merge with it.
258 // In particular, null-checks and other low-level exceptions common up here.
259 Node* ex_oop = saved_ex_oop(ex_map);
260 const Type* ex_type = _gvn.type(ex_oop);
261 if (ex_oop == top()) {
262 // No action needed.
263 return;
264 }
265 assert(ex_type->isa_instptr(), "exception must be an instance");
266 for (SafePointNode* e2 = _exceptions; e2 != NULL; e2 = e2->next_exception()) {
267 const Type* ex_type2 = _gvn.type(saved_ex_oop(e2));
268 // We check sp also because call bytecodes can generate exceptions
269 // both before and after arguments are popped!
270 if (ex_type2 == ex_type
271 && e2->_jvms->sp() == ex_map->_jvms->sp()) {
272 combine_exception_states(ex_map, e2);
273 return;
274 }
275 }
276
277 // No pre-existing exception of the same type. Chain it on the list.
278 push_exception_state(ex_map);
279 }
280
281 //-----------------------add_exception_states_from-----------------------------
282 void GraphKit::add_exception_states_from(JVMState* jvms) {
283 SafePointNode* ex_map = jvms->map()->next_exception();
284 if (ex_map != NULL) {
285 jvms->map()->set_next_exception(NULL);
286 for (SafePointNode* next_map; ex_map != NULL; ex_map = next_map) {
287 next_map = ex_map->next_exception();
288 ex_map->set_next_exception(NULL);
289 add_exception_state(ex_map);
290 }
291 }
292 }
293
294 //-----------------------transfer_exceptions_into_jvms-------------------------
295 JVMState* GraphKit::transfer_exceptions_into_jvms() {
296 if (map() == NULL) {
297 // We need a JVMS to carry the exceptions, but the map has gone away.
298 // Create a scratch JVMS, cloned from any of the exception states...
299 if (has_exceptions()) {
300 _map = _exceptions;
301 _map = clone_map();
302 _map->set_next_exception(NULL);
303 clear_saved_ex_oop(_map);
304 debug_only(verify_map());
305 } else {
306 // ...or created from scratch
307 JVMState* jvms = new (C) JVMState(_method, NULL);
308 jvms->set_bci(_bci);
309 jvms->set_sp(_sp);
310 jvms->set_map(new SafePointNode(TypeFunc::Parms, jvms));
311 set_jvms(jvms);
312 for (uint i = 0; i < map()->req(); i++) map()->init_req(i, top());
313 set_all_memory(top());
314 while (map()->req() < jvms->endoff()) map()->add_req(top());
315 }
316 // (This is a kludge, in case you didn't notice.)
317 set_control(top());
318 }
319 JVMState* jvms = sync_jvms();
320 assert(!jvms->map()->has_exceptions(), "no exceptions on this map yet");
321 jvms->map()->set_next_exception(_exceptions);
322 _exceptions = NULL; // done with this set of exceptions
323 return jvms;
324 }
325
326 static inline void add_n_reqs(Node* dstphi, Node* srcphi) {
327 assert(is_hidden_merge(dstphi), "must be a special merge node");
328 assert(is_hidden_merge(srcphi), "must be a special merge node");
329 uint limit = srcphi->req();
330 for (uint i = PhiNode::Input; i < limit; i++) {
331 dstphi->add_req(srcphi->in(i));
332 }
333 }
334 static inline void add_one_req(Node* dstphi, Node* src) {
335 assert(is_hidden_merge(dstphi), "must be a special merge node");
336 assert(!is_hidden_merge(src), "must not be a special merge node");
337 dstphi->add_req(src);
338 }
339
340 //-----------------------combine_exception_states------------------------------
341 // This helper function combines exception states by building phis on a
342 // specially marked state-merging region. These regions and phis are
343 // untransformed, and can build up gradually. The region is marked by
344 // having a control input of its exception map, rather than NULL. Such
345 // regions do not appear except in this function, and in use_exception_state.
346 void GraphKit::combine_exception_states(SafePointNode* ex_map, SafePointNode* phi_map) {
347 if (failing()) return; // dying anyway...
348 JVMState* ex_jvms = ex_map->_jvms;
349 assert(ex_jvms->same_calls_as(phi_map->_jvms), "consistent call chains");
350 assert(ex_jvms->stkoff() == phi_map->_jvms->stkoff(), "matching locals");
351 assert(ex_jvms->sp() == phi_map->_jvms->sp(), "matching stack sizes");
352 assert(ex_jvms->monoff() == phi_map->_jvms->monoff(), "matching JVMS");
353 assert(ex_jvms->scloff() == phi_map->_jvms->scloff(), "matching scalar replaced objects");
354 assert(ex_map->req() == phi_map->req(), "matching maps");
355 uint tos = ex_jvms->stkoff() + ex_jvms->sp();
356 Node* hidden_merge_mark = root();
357 Node* region = phi_map->control();
358 MergeMemNode* phi_mem = phi_map->merged_memory();
359 MergeMemNode* ex_mem = ex_map->merged_memory();
360 if (region->in(0) != hidden_merge_mark) {
361 // The control input is not (yet) a specially-marked region in phi_map.
362 // Make it so, and build some phis.
363 region = new RegionNode(2);
364 _gvn.set_type(region, Type::CONTROL);
365 region->set_req(0, hidden_merge_mark); // marks an internal ex-state
366 region->init_req(1, phi_map->control());
367 phi_map->set_control(region);
368 Node* io_phi = PhiNode::make(region, phi_map->i_o(), Type::ABIO);
369 record_for_igvn(io_phi);
370 _gvn.set_type(io_phi, Type::ABIO);
371 phi_map->set_i_o(io_phi);
372 for (MergeMemStream mms(phi_mem); mms.next_non_empty(); ) {
373 Node* m = mms.memory();
374 Node* m_phi = PhiNode::make(region, m, Type::MEMORY, mms.adr_type(C));
375 record_for_igvn(m_phi);
376 _gvn.set_type(m_phi, Type::MEMORY);
377 mms.set_memory(m_phi);
378 }
379 }
380
381 // Either or both of phi_map and ex_map might already be converted into phis.
382 Node* ex_control = ex_map->control();
383 // if there is special marking on ex_map also, we add multiple edges from src
384 bool add_multiple = (ex_control->in(0) == hidden_merge_mark);
385 // how wide was the destination phi_map, originally?
386 uint orig_width = region->req();
387
388 if (add_multiple) {
389 add_n_reqs(region, ex_control);
390 add_n_reqs(phi_map->i_o(), ex_map->i_o());
391 } else {
392 // ex_map has no merges, so we just add single edges everywhere
393 add_one_req(region, ex_control);
394 add_one_req(phi_map->i_o(), ex_map->i_o());
395 }
396 for (MergeMemStream mms(phi_mem, ex_mem); mms.next_non_empty2(); ) {
397 if (mms.is_empty()) {
398 // get a copy of the base memory, and patch some inputs into it
399 const TypePtr* adr_type = mms.adr_type(C);
400 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type);
401 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), "");
402 mms.set_memory(phi);
403 // Prepare to append interesting stuff onto the newly sliced phi:
404 while (phi->req() > orig_width) phi->del_req(phi->req()-1);
405 }
406 // Append stuff from ex_map:
407 if (add_multiple) {
408 add_n_reqs(mms.memory(), mms.memory2());
409 } else {
410 add_one_req(mms.memory(), mms.memory2());
411 }
412 }
413 uint limit = ex_map->req();
414 for (uint i = TypeFunc::Parms; i < limit; i++) {
415 // Skip everything in the JVMS after tos. (The ex_oop follows.)
416 if (i == tos) i = ex_jvms->monoff();
417 Node* src = ex_map->in(i);
418 Node* dst = phi_map->in(i);
419 if (src != dst) {
420 PhiNode* phi;
421 if (dst->in(0) != region) {
422 dst = phi = PhiNode::make(region, dst, _gvn.type(dst));
423 record_for_igvn(phi);
424 _gvn.set_type(phi, phi->type());
425 phi_map->set_req(i, dst);
426 // Prepare to append interesting stuff onto the new phi:
427 while (dst->req() > orig_width) dst->del_req(dst->req()-1);
428 } else {
429 assert(dst->is_Phi(), "nobody else uses a hidden region");
430 phi = dst->as_Phi();
431 }
432 if (add_multiple && src->in(0) == ex_control) {
433 // Both are phis.
434 add_n_reqs(dst, src);
435 } else {
436 while (dst->req() < region->req()) add_one_req(dst, src);
437 }
438 const Type* srctype = _gvn.type(src);
439 if (phi->type() != srctype) {
440 const Type* dsttype = phi->type()->meet_speculative(srctype);
441 if (phi->type() != dsttype) {
442 phi->set_type(dsttype);
443 _gvn.set_type(phi, dsttype);
444 }
445 }
446 }
447 }
448 phi_map->merge_replaced_nodes_with(ex_map);
449 }
450
451 //--------------------------use_exception_state--------------------------------
452 Node* GraphKit::use_exception_state(SafePointNode* phi_map) {
453 if (failing()) { stop(); return top(); }
454 Node* region = phi_map->control();
455 Node* hidden_merge_mark = root();
456 assert(phi_map->jvms()->map() == phi_map, "sanity: 1-1 relation");
457 Node* ex_oop = clear_saved_ex_oop(phi_map);
458 if (region->in(0) == hidden_merge_mark) {
459 // Special marking for internal ex-states. Process the phis now.
460 region->set_req(0, region); // now it's an ordinary region
461 set_jvms(phi_map->jvms()); // ...so now we can use it as a map
462 // Note: Setting the jvms also sets the bci and sp.
463 set_control(_gvn.transform(region));
464 uint tos = jvms()->stkoff() + sp();
465 for (uint i = 1; i < tos; i++) {
466 Node* x = phi_map->in(i);
467 if (x->in(0) == region) {
468 assert(x->is_Phi(), "expected a special phi");
469 phi_map->set_req(i, _gvn.transform(x));
470 }
471 }
472 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) {
473 Node* x = mms.memory();
474 if (x->in(0) == region) {
475 assert(x->is_Phi(), "nobody else uses a hidden region");
476 mms.set_memory(_gvn.transform(x));
477 }
478 }
479 if (ex_oop->in(0) == region) {
480 assert(ex_oop->is_Phi(), "expected a special phi");
481 ex_oop = _gvn.transform(ex_oop);
482 }
483 } else {
484 set_jvms(phi_map->jvms());
485 }
486
487 assert(!is_hidden_merge(phi_map->control()), "hidden ex. states cleared");
488 assert(!is_hidden_merge(phi_map->i_o()), "hidden ex. states cleared");
489 return ex_oop;
490 }
491
492 //---------------------------------java_bc-------------------------------------
493 Bytecodes::Code GraphKit::java_bc() const {
494 ciMethod* method = this->method();
495 int bci = this->bci();
496 if (method != NULL && bci != InvocationEntryBci)
497 return method->java_code_at_bci(bci);
498 else
499 return Bytecodes::_illegal;
500 }
501
502 void GraphKit::uncommon_trap_if_should_post_on_exceptions(Deoptimization::DeoptReason reason,
503 bool must_throw) {
504 // if the exception capability is set, then we will generate code
505 // to check the JavaThread.should_post_on_exceptions flag to see
506 // if we actually need to report exception events (for this
507 // thread). If we don't need to report exception events, we will
508 // take the normal fast path provided by add_exception_events. If
509 // exception event reporting is enabled for this thread, we will
510 // take the uncommon_trap in the BuildCutout below.
511
512 // first must access the should_post_on_exceptions_flag in this thread's JavaThread
513 Node* jthread = _gvn.transform(new ThreadLocalNode());
514 Node* adr = basic_plus_adr(top(), jthread, in_bytes(JavaThread::should_post_on_exceptions_flag_offset()));
515 Node* should_post_flag = make_load(control(), adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw, MemNode::unordered);
516
517 // Test the should_post_on_exceptions_flag vs. 0
518 Node* chk = _gvn.transform( new CmpINode(should_post_flag, intcon(0)) );
519 Node* tst = _gvn.transform( new BoolNode(chk, BoolTest::eq) );
520
521 // Branch to slow_path if should_post_on_exceptions_flag was true
522 { BuildCutout unless(this, tst, PROB_MAX);
523 // Do not try anything fancy if we're notifying the VM on every throw.
524 // Cf. case Bytecodes::_athrow in parse2.cpp.
525 uncommon_trap(reason, Deoptimization::Action_none,
526 (ciKlass*)NULL, (char*)NULL, must_throw);
527 }
528
529 }
530
531 //------------------------------builtin_throw----------------------------------
532 void GraphKit::builtin_throw(Deoptimization::DeoptReason reason, Node* arg) {
533 bool must_throw = true;
534
535 if (env()->jvmti_can_post_on_exceptions()) {
536 // check if we must post exception events, take uncommon trap if so
537 uncommon_trap_if_should_post_on_exceptions(reason, must_throw);
538 // here if should_post_on_exceptions is false
539 // continue on with the normal codegen
540 }
541
542 // If this particular condition has not yet happened at this
543 // bytecode, then use the uncommon trap mechanism, and allow for
544 // a future recompilation if several traps occur here.
545 // If the throw is hot, try to use a more complicated inline mechanism
546 // which keeps execution inside the compiled code.
547 bool treat_throw_as_hot = false;
548 ciMethodData* md = method()->method_data();
549
550 if (ProfileTraps) {
551 if (too_many_traps(reason)) {
552 treat_throw_as_hot = true;
553 }
554 // (If there is no MDO at all, assume it is early in
555 // execution, and that any deopts are part of the
556 // startup transient, and don't need to be remembered.)
557
558 // Also, if there is a local exception handler, treat all throws
559 // as hot if there has been at least one in this method.
560 if (C->trap_count(reason) != 0
561 && method()->method_data()->trap_count(reason) != 0
562 && has_ex_handler()) {
563 treat_throw_as_hot = true;
564 }
565 }
566
567 // If this throw happens frequently, an uncommon trap might cause
568 // a performance pothole. If there is a local exception handler,
569 // and if this particular bytecode appears to be deoptimizing often,
570 // let us handle the throw inline, with a preconstructed instance.
571 // Note: If the deopt count has blown up, the uncommon trap
572 // runtime is going to flush this nmethod, not matter what.
573 if (treat_throw_as_hot
574 && (!StackTraceInThrowable || OmitStackTraceInFastThrow)) {
575 // If the throw is local, we use a pre-existing instance and
576 // punt on the backtrace. This would lead to a missing backtrace
577 // (a repeat of 4292742) if the backtrace object is ever asked
578 // for its backtrace.
579 // Fixing this remaining case of 4292742 requires some flavor of
580 // escape analysis. Leave that for the future.
581 ciInstance* ex_obj = NULL;
582 switch (reason) {
583 case Deoptimization::Reason_null_check:
584 ex_obj = env()->NullPointerException_instance();
585 break;
586 case Deoptimization::Reason_div0_check:
587 ex_obj = env()->ArithmeticException_instance();
588 break;
589 case Deoptimization::Reason_range_check:
590 ex_obj = env()->ArrayIndexOutOfBoundsException_instance();
591 break;
592 case Deoptimization::Reason_class_check:
593 if (java_bc() == Bytecodes::_aastore) {
594 ex_obj = env()->ArrayStoreException_instance();
595 } else {
596 ex_obj = env()->ClassCastException_instance();
597 }
598 break;
599 default:
600 break;
601 }
602 if (failing()) { stop(); return; } // exception allocation might fail
603 if (ex_obj != NULL) {
604 // Cheat with a preallocated exception object.
605 if (C->log() != NULL)
606 C->log()->elem("hot_throw preallocated='1' reason='%s'",
607 Deoptimization::trap_reason_name(reason));
608 const TypeInstPtr* ex_con = TypeInstPtr::make(ex_obj);
609 Node* ex_node = _gvn.transform(ConNode::make(ex_con));
610
611 // Clear the detail message of the preallocated exception object.
612 // Weblogic sometimes mutates the detail message of exceptions
613 // using reflection.
614 int offset = java_lang_Throwable::get_detailMessage_offset();
615 const TypePtr* adr_typ = ex_con->add_offset(offset);
616
617 Node *adr = basic_plus_adr(ex_node, ex_node, offset);
618 const TypeOopPtr* val_type = TypeOopPtr::make_from_klass(env()->String_klass());
619 Node *store = access_store_at(ex_node, adr, adr_typ, null(), val_type, T_OBJECT, IN_HEAP);
620
621 add_exception_state(make_exception_state(ex_node));
622 return;
623 }
624 }
625
626 // %%% Maybe add entry to OptoRuntime which directly throws the exc.?
627 // It won't be much cheaper than bailing to the interp., since we'll
628 // have to pass up all the debug-info, and the runtime will have to
629 // create the stack trace.
630
631 // Usual case: Bail to interpreter.
632 // Reserve the right to recompile if we haven't seen anything yet.
633
634 ciMethod* m = Deoptimization::reason_is_speculate(reason) ? C->method() : NULL;
635 Deoptimization::DeoptAction action = Deoptimization::Action_maybe_recompile;
636 if (treat_throw_as_hot
637 && (method()->method_data()->trap_recompiled_at(bci(), m)
638 || C->too_many_traps(reason))) {
639 // We cannot afford to take more traps here. Suffer in the interpreter.
640 if (C->log() != NULL)
641 C->log()->elem("hot_throw preallocated='0' reason='%s' mcount='%d'",
642 Deoptimization::trap_reason_name(reason),
643 C->trap_count(reason));
644 action = Deoptimization::Action_none;
645 }
646
647 // "must_throw" prunes the JVM state to include only the stack, if there
648 // are no local exception handlers. This should cut down on register
649 // allocation time and code size, by drastically reducing the number
650 // of in-edges on the call to the uncommon trap.
651
652 uncommon_trap(reason, action, (ciKlass*)NULL, (char*)NULL, must_throw);
653 }
654
655
656 //----------------------------PreserveJVMState---------------------------------
657 PreserveJVMState::PreserveJVMState(GraphKit* kit, bool clone_map) {
658 debug_only(kit->verify_map());
659 _kit = kit;
660 _map = kit->map(); // preserve the map
661 _sp = kit->sp();
662 kit->set_map(clone_map ? kit->clone_map() : NULL);
663 #ifdef ASSERT
664 _bci = kit->bci();
665 Parse* parser = kit->is_Parse();
666 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo();
667 _block = block;
668 #endif
669 }
670 PreserveJVMState::~PreserveJVMState() {
671 GraphKit* kit = _kit;
672 #ifdef ASSERT
673 assert(kit->bci() == _bci, "bci must not shift");
674 Parse* parser = kit->is_Parse();
675 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo();
676 assert(block == _block, "block must not shift");
677 #endif
678 kit->set_map(_map);
679 kit->set_sp(_sp);
680 }
681
682
683 //-----------------------------BuildCutout-------------------------------------
684 BuildCutout::BuildCutout(GraphKit* kit, Node* p, float prob, float cnt)
685 : PreserveJVMState(kit)
686 {
687 assert(p->is_Con() || p->is_Bool(), "test must be a bool");
688 SafePointNode* outer_map = _map; // preserved map is caller's
689 SafePointNode* inner_map = kit->map();
690 IfNode* iff = kit->create_and_map_if(outer_map->control(), p, prob, cnt);
691 outer_map->set_control(kit->gvn().transform( new IfTrueNode(iff) ));
692 inner_map->set_control(kit->gvn().transform( new IfFalseNode(iff) ));
693 }
694 BuildCutout::~BuildCutout() {
695 GraphKit* kit = _kit;
696 assert(kit->stopped(), "cutout code must stop, throw, return, etc.");
697 }
698
699 //---------------------------PreserveReexecuteState----------------------------
700 PreserveReexecuteState::PreserveReexecuteState(GraphKit* kit) {
701 assert(!kit->stopped(), "must call stopped() before");
702 _kit = kit;
703 _sp = kit->sp();
704 _reexecute = kit->jvms()->_reexecute;
705 }
706 PreserveReexecuteState::~PreserveReexecuteState() {
707 if (_kit->stopped()) return;
708 _kit->jvms()->_reexecute = _reexecute;
709 _kit->set_sp(_sp);
710 }
711
712 //------------------------------clone_map--------------------------------------
713 // Implementation of PreserveJVMState
714 //
715 // Only clone_map(...) here. If this function is only used in the
716 // PreserveJVMState class we may want to get rid of this extra
717 // function eventually and do it all there.
718
719 SafePointNode* GraphKit::clone_map() {
720 if (map() == NULL) return NULL;
721
722 // Clone the memory edge first
723 Node* mem = MergeMemNode::make(map()->memory());
724 gvn().set_type_bottom(mem);
725
726 SafePointNode *clonemap = (SafePointNode*)map()->clone();
727 JVMState* jvms = this->jvms();
728 JVMState* clonejvms = jvms->clone_shallow(C);
729 clonemap->set_memory(mem);
730 clonemap->set_jvms(clonejvms);
731 clonejvms->set_map(clonemap);
732 record_for_igvn(clonemap);
733 gvn().set_type_bottom(clonemap);
734 return clonemap;
735 }
736
737
738 //-----------------------------set_map_clone-----------------------------------
739 void GraphKit::set_map_clone(SafePointNode* m) {
740 _map = m;
741 _map = clone_map();
742 _map->set_next_exception(NULL);
743 debug_only(verify_map());
744 }
745
746
747 //----------------------------kill_dead_locals---------------------------------
748 // Detect any locals which are known to be dead, and force them to top.
749 void GraphKit::kill_dead_locals() {
750 // Consult the liveness information for the locals. If any
751 // of them are unused, then they can be replaced by top(). This
752 // should help register allocation time and cut down on the size
753 // of the deoptimization information.
754
755 // This call is made from many of the bytecode handling
756 // subroutines called from the Big Switch in do_one_bytecode.
757 // Every bytecode which might include a slow path is responsible
758 // for killing its dead locals. The more consistent we
759 // are about killing deads, the fewer useless phis will be
760 // constructed for them at various merge points.
761
762 // bci can be -1 (InvocationEntryBci). We return the entry
763 // liveness for the method.
764
765 if (method() == NULL || method()->code_size() == 0) {
766 // We are building a graph for a call to a native method.
767 // All locals are live.
768 return;
769 }
770
771 ResourceMark rm;
772
773 // Consult the liveness information for the locals. If any
774 // of them are unused, then they can be replaced by top(). This
775 // should help register allocation time and cut down on the size
776 // of the deoptimization information.
777 MethodLivenessResult live_locals = method()->liveness_at_bci(bci());
778
779 int len = (int)live_locals.size();
780 assert(len <= jvms()->loc_size(), "too many live locals");
781 for (int local = 0; local < len; local++) {
782 if (!live_locals.at(local)) {
783 set_local(local, top());
784 }
785 }
786 }
787
788 #ifdef ASSERT
789 //-------------------------dead_locals_are_killed------------------------------
790 // Return true if all dead locals are set to top in the map.
791 // Used to assert "clean" debug info at various points.
792 bool GraphKit::dead_locals_are_killed() {
793 if (method() == NULL || method()->code_size() == 0) {
794 // No locals need to be dead, so all is as it should be.
795 return true;
796 }
797
798 // Make sure somebody called kill_dead_locals upstream.
799 ResourceMark rm;
800 for (JVMState* jvms = this->jvms(); jvms != NULL; jvms = jvms->caller()) {
801 if (jvms->loc_size() == 0) continue; // no locals to consult
802 SafePointNode* map = jvms->map();
803 ciMethod* method = jvms->method();
804 int bci = jvms->bci();
805 if (jvms == this->jvms()) {
806 bci = this->bci(); // it might not yet be synched
807 }
808 MethodLivenessResult live_locals = method->liveness_at_bci(bci);
809 int len = (int)live_locals.size();
810 if (!live_locals.is_valid() || len == 0)
811 // This method is trivial, or is poisoned by a breakpoint.
812 return true;
813 assert(len == jvms->loc_size(), "live map consistent with locals map");
814 for (int local = 0; local < len; local++) {
815 if (!live_locals.at(local) && map->local(jvms, local) != top()) {
816 if (PrintMiscellaneous && (Verbose || WizardMode)) {
817 tty->print_cr("Zombie local %d: ", local);
818 jvms->dump();
819 }
820 return false;
821 }
822 }
823 }
824 return true;
825 }
826
827 #endif //ASSERT
828
829 // Helper function for enforcing certain bytecodes to reexecute if
830 // deoptimization happens
831 static bool should_reexecute_implied_by_bytecode(JVMState *jvms, bool is_anewarray) {
832 ciMethod* cur_method = jvms->method();
833 int cur_bci = jvms->bci();
834 if (cur_method != NULL && cur_bci != InvocationEntryBci) {
835 Bytecodes::Code code = cur_method->java_code_at_bci(cur_bci);
836 return Interpreter::bytecode_should_reexecute(code) ||
837 (is_anewarray && (code == Bytecodes::_multianewarray));
838 // Reexecute _multianewarray bytecode which was replaced with
839 // sequence of [a]newarray. See Parse::do_multianewarray().
840 //
841 // Note: interpreter should not have it set since this optimization
842 // is limited by dimensions and guarded by flag so in some cases
843 // multianewarray() runtime calls will be generated and
844 // the bytecode should not be reexecutes (stack will not be reset).
845 } else {
846 return false;
847 }
848 }
849
850 // Helper function for adding JVMState and debug information to node
851 void GraphKit::add_safepoint_edges(SafePointNode* call, bool must_throw) {
852 // Add the safepoint edges to the call (or other safepoint).
853
854 // Make sure dead locals are set to top. This
855 // should help register allocation time and cut down on the size
856 // of the deoptimization information.
857 assert(dead_locals_are_killed(), "garbage in debug info before safepoint");
858
859 // Walk the inline list to fill in the correct set of JVMState's
860 // Also fill in the associated edges for each JVMState.
861
862 // If the bytecode needs to be reexecuted we need to put
863 // the arguments back on the stack.
864 const bool should_reexecute = jvms()->should_reexecute();
865 JVMState* youngest_jvms = should_reexecute ? sync_jvms_for_reexecute() : sync_jvms();
866
867 // NOTE: set_bci (called from sync_jvms) might reset the reexecute bit to
868 // undefined if the bci is different. This is normal for Parse but it
869 // should not happen for LibraryCallKit because only one bci is processed.
870 assert(!is_LibraryCallKit() || (jvms()->should_reexecute() == should_reexecute),
871 "in LibraryCallKit the reexecute bit should not change");
872
873 // If we are guaranteed to throw, we can prune everything but the
874 // input to the current bytecode.
875 bool can_prune_locals = false;
876 uint stack_slots_not_pruned = 0;
877 int inputs = 0, depth = 0;
878 if (must_throw) {
879 assert(method() == youngest_jvms->method(), "sanity");
880 if (compute_stack_effects(inputs, depth)) {
881 can_prune_locals = true;
882 stack_slots_not_pruned = inputs;
883 }
884 }
885
886 if (env()->should_retain_local_variables()) {
887 // At any safepoint, this method can get breakpointed, which would
888 // then require an immediate deoptimization.
889 can_prune_locals = false; // do not prune locals
890 stack_slots_not_pruned = 0;
891 }
892
893 // do not scribble on the input jvms
894 JVMState* out_jvms = youngest_jvms->clone_deep(C);
895 call->set_jvms(out_jvms); // Start jvms list for call node
896
897 // For a known set of bytecodes, the interpreter should reexecute them if
898 // deoptimization happens. We set the reexecute state for them here
899 if (out_jvms->is_reexecute_undefined() && //don't change if already specified
900 should_reexecute_implied_by_bytecode(out_jvms, call->is_AllocateArray())) {
901 out_jvms->set_should_reexecute(true); //NOTE: youngest_jvms not changed
902 }
903
904 // Presize the call:
905 DEBUG_ONLY(uint non_debug_edges = call->req());
906 call->add_req_batch(top(), youngest_jvms->debug_depth());
907 assert(call->req() == non_debug_edges + youngest_jvms->debug_depth(), "");
908
909 // Set up edges so that the call looks like this:
910 // Call [state:] ctl io mem fptr retadr
911 // [parms:] parm0 ... parmN
912 // [root:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN
913 // [...mid:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN [...]
914 // [young:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN
915 // Note that caller debug info precedes callee debug info.
916
917 // Fill pointer walks backwards from "young:" to "root:" in the diagram above:
918 uint debug_ptr = call->req();
919
920 // Loop over the map input edges associated with jvms, add them
921 // to the call node, & reset all offsets to match call node array.
922 for (JVMState* in_jvms = youngest_jvms; in_jvms != NULL; ) {
923 uint debug_end = debug_ptr;
924 uint debug_start = debug_ptr - in_jvms->debug_size();
925 debug_ptr = debug_start; // back up the ptr
926
927 uint p = debug_start; // walks forward in [debug_start, debug_end)
928 uint j, k, l;
929 SafePointNode* in_map = in_jvms->map();
930 out_jvms->set_map(call);
931
932 if (can_prune_locals) {
933 assert(in_jvms->method() == out_jvms->method(), "sanity");
934 // If the current throw can reach an exception handler in this JVMS,
935 // then we must keep everything live that can reach that handler.
936 // As a quick and dirty approximation, we look for any handlers at all.
937 if (in_jvms->method()->has_exception_handlers()) {
938 can_prune_locals = false;
939 }
940 }
941
942 // Add the Locals
943 k = in_jvms->locoff();
944 l = in_jvms->loc_size();
945 out_jvms->set_locoff(p);
946 if (!can_prune_locals) {
947 for (j = 0; j < l; j++)
948 call->set_req(p++, in_map->in(k+j));
949 } else {
950 p += l; // already set to top above by add_req_batch
951 }
952
953 // Add the Expression Stack
954 k = in_jvms->stkoff();
955 l = in_jvms->sp();
956 out_jvms->set_stkoff(p);
957 if (!can_prune_locals) {
958 for (j = 0; j < l; j++)
959 call->set_req(p++, in_map->in(k+j));
960 } else if (can_prune_locals && stack_slots_not_pruned != 0) {
961 // Divide stack into {S0,...,S1}, where S0 is set to top.
962 uint s1 = stack_slots_not_pruned;
963 stack_slots_not_pruned = 0; // for next iteration
964 if (s1 > l) s1 = l;
965 uint s0 = l - s1;
966 p += s0; // skip the tops preinstalled by add_req_batch
967 for (j = s0; j < l; j++)
968 call->set_req(p++, in_map->in(k+j));
969 } else {
970 p += l; // already set to top above by add_req_batch
971 }
972
973 // Add the Monitors
974 k = in_jvms->monoff();
975 l = in_jvms->mon_size();
976 out_jvms->set_monoff(p);
977 for (j = 0; j < l; j++)
978 call->set_req(p++, in_map->in(k+j));
979
980 // Copy any scalar object fields.
981 k = in_jvms->scloff();
982 l = in_jvms->scl_size();
983 out_jvms->set_scloff(p);
984 for (j = 0; j < l; j++)
985 call->set_req(p++, in_map->in(k+j));
986
987 // Finish the new jvms.
988 out_jvms->set_endoff(p);
989
990 assert(out_jvms->endoff() == debug_end, "fill ptr must match");
991 assert(out_jvms->depth() == in_jvms->depth(), "depth must match");
992 assert(out_jvms->loc_size() == in_jvms->loc_size(), "size must match");
993 assert(out_jvms->mon_size() == in_jvms->mon_size(), "size must match");
994 assert(out_jvms->scl_size() == in_jvms->scl_size(), "size must match");
995 assert(out_jvms->debug_size() == in_jvms->debug_size(), "size must match");
996
997 // Update the two tail pointers in parallel.
998 out_jvms = out_jvms->caller();
999 in_jvms = in_jvms->caller();
1000 }
1001
1002 assert(debug_ptr == non_debug_edges, "debug info must fit exactly");
1003
1004 // Test the correctness of JVMState::debug_xxx accessors:
1005 assert(call->jvms()->debug_start() == non_debug_edges, "");
1006 assert(call->jvms()->debug_end() == call->req(), "");
1007 assert(call->jvms()->debug_depth() == call->req() - non_debug_edges, "");
1008 }
1009
1010 bool GraphKit::compute_stack_effects(int& inputs, int& depth) {
1011 Bytecodes::Code code = java_bc();
1012 if (code == Bytecodes::_wide) {
1013 code = method()->java_code_at_bci(bci() + 1);
1014 }
1015
1016 BasicType rtype = T_ILLEGAL;
1017 int rsize = 0;
1018
1019 if (code != Bytecodes::_illegal) {
1020 depth = Bytecodes::depth(code); // checkcast=0, athrow=-1
1021 rtype = Bytecodes::result_type(code); // checkcast=P, athrow=V
1022 if (rtype < T_CONFLICT)
1023 rsize = type2size[rtype];
1024 }
1025
1026 switch (code) {
1027 case Bytecodes::_illegal:
1028 return false;
1029
1030 case Bytecodes::_ldc:
1031 case Bytecodes::_ldc_w:
1032 case Bytecodes::_ldc2_w:
1033 inputs = 0;
1034 break;
1035
1036 case Bytecodes::_dup: inputs = 1; break;
1037 case Bytecodes::_dup_x1: inputs = 2; break;
1038 case Bytecodes::_dup_x2: inputs = 3; break;
1039 case Bytecodes::_dup2: inputs = 2; break;
1040 case Bytecodes::_dup2_x1: inputs = 3; break;
1041 case Bytecodes::_dup2_x2: inputs = 4; break;
1042 case Bytecodes::_swap: inputs = 2; break;
1043 case Bytecodes::_arraylength: inputs = 1; break;
1044
1045 case Bytecodes::_getstatic:
1046 case Bytecodes::_putstatic:
1047 case Bytecodes::_getfield:
1048 case Bytecodes::_putfield:
1049 {
1050 bool ignored_will_link;
1051 ciField* field = method()->get_field_at_bci(bci(), ignored_will_link);
1052 int size = field->type()->size();
1053 bool is_get = (depth >= 0), is_static = (depth & 1);
1054 inputs = (is_static ? 0 : 1);
1055 if (is_get) {
1056 depth = size - inputs;
1057 } else {
1058 inputs += size; // putxxx pops the value from the stack
1059 depth = - inputs;
1060 }
1061 }
1062 break;
1063
1064 case Bytecodes::_invokevirtual:
1065 case Bytecodes::_invokespecial:
1066 case Bytecodes::_invokestatic:
1067 case Bytecodes::_invokedynamic:
1068 case Bytecodes::_invokeinterface:
1069 {
1070 bool ignored_will_link;
1071 ciSignature* declared_signature = NULL;
1072 ciMethod* ignored_callee = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature);
1073 assert(declared_signature != NULL, "cannot be null");
1074 inputs = declared_signature->arg_size_for_bc(code);
1075 int size = declared_signature->return_type()->size();
1076 depth = size - inputs;
1077 }
1078 break;
1079
1080 case Bytecodes::_multianewarray:
1081 {
1082 ciBytecodeStream iter(method());
1083 iter.reset_to_bci(bci());
1084 iter.next();
1085 inputs = iter.get_dimensions();
1086 assert(rsize == 1, "");
1087 depth = rsize - inputs;
1088 }
1089 break;
1090
1091 case Bytecodes::_withfield: {
1092 bool ignored_will_link;
1093 ciField* field = method()->get_field_at_bci(bci(), ignored_will_link);
1094 int size = field->type()->size();
1095 inputs = size+1;
1096 depth = rsize - inputs;
1097 break;
1098 }
1099
1100 case Bytecodes::_ireturn:
1101 case Bytecodes::_lreturn:
1102 case Bytecodes::_freturn:
1103 case Bytecodes::_dreturn:
1104 case Bytecodes::_areturn:
1105 assert(rsize == -depth, "");
1106 inputs = rsize;
1107 break;
1108
1109 case Bytecodes::_jsr:
1110 case Bytecodes::_jsr_w:
1111 inputs = 0;
1112 depth = 1; // S.B. depth=1, not zero
1113 break;
1114
1115 default:
1116 // bytecode produces a typed result
1117 inputs = rsize - depth;
1118 assert(inputs >= 0, "");
1119 break;
1120 }
1121
1122 #ifdef ASSERT
1123 // spot check
1124 int outputs = depth + inputs;
1125 assert(outputs >= 0, "sanity");
1126 switch (code) {
1127 case Bytecodes::_checkcast: assert(inputs == 1 && outputs == 1, ""); break;
1128 case Bytecodes::_athrow: assert(inputs == 1 && outputs == 0, ""); break;
1129 case Bytecodes::_aload_0: assert(inputs == 0 && outputs == 1, ""); break;
1130 case Bytecodes::_return: assert(inputs == 0 && outputs == 0, ""); break;
1131 case Bytecodes::_drem: assert(inputs == 4 && outputs == 2, ""); break;
1132 default: break;
1133 }
1134 #endif //ASSERT
1135
1136 return true;
1137 }
1138
1139
1140
1141 //------------------------------basic_plus_adr---------------------------------
1142 Node* GraphKit::basic_plus_adr(Node* base, Node* ptr, Node* offset) {
1143 // short-circuit a common case
1144 if (offset == intcon(0)) return ptr;
1145 return _gvn.transform( new AddPNode(base, ptr, offset) );
1146 }
1147
1148 Node* GraphKit::ConvI2L(Node* offset) {
1149 // short-circuit a common case
1150 jint offset_con = find_int_con(offset, Type::OffsetBot);
1151 if (offset_con != Type::OffsetBot) {
1152 return longcon((jlong) offset_con);
1153 }
1154 return _gvn.transform( new ConvI2LNode(offset));
1155 }
1156
1157 Node* GraphKit::ConvI2UL(Node* offset) {
1158 juint offset_con = (juint) find_int_con(offset, Type::OffsetBot);
1159 if (offset_con != (juint) Type::OffsetBot) {
1160 return longcon((julong) offset_con);
1161 }
1162 Node* conv = _gvn.transform( new ConvI2LNode(offset));
1163 Node* mask = _gvn.transform(ConLNode::make((julong) max_juint));
1164 return _gvn.transform( new AndLNode(conv, mask) );
1165 }
1166
1167 Node* GraphKit::ConvL2I(Node* offset) {
1168 // short-circuit a common case
1169 jlong offset_con = find_long_con(offset, (jlong)Type::OffsetBot);
1170 if (offset_con != (jlong)Type::OffsetBot) {
1171 return intcon((int) offset_con);
1172 }
1173 return _gvn.transform( new ConvL2INode(offset));
1174 }
1175
1176 //-------------------------load_object_klass-----------------------------------
1177 Node* GraphKit::load_object_klass(Node* obj) {
1178 // Special-case a fresh allocation to avoid building nodes:
1179 Node* akls = AllocateNode::Ideal_klass(obj, &_gvn);
1180 if (akls != NULL) return akls;
1181 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes());
1182 return _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), k_adr, TypeInstPtr::KLASS));
1183 }
1184
1185 //-------------------------load_array_length-----------------------------------
1186 Node* GraphKit::load_array_length(Node* array) {
1187 // Special-case a fresh allocation to avoid building nodes:
1188 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(array, &_gvn);
1189 Node *alen;
1190 if (alloc == NULL) {
1191 Node *r_adr = basic_plus_adr(array, arrayOopDesc::length_offset_in_bytes());
1192 alen = _gvn.transform( new LoadRangeNode(0, immutable_memory(), r_adr, TypeInt::POS));
1193 } else {
1194 alen = alloc->Ideal_length();
1195 Node* ccast = alloc->make_ideal_length(_gvn.type(array)->is_oopptr(), &_gvn);
1196 if (ccast != alen) {
1197 alen = _gvn.transform(ccast);
1198 }
1199 }
1200 return alen;
1201 }
1202
1203 //------------------------------do_null_check----------------------------------
1204 // Helper function to do a NULL pointer check. Returned value is
1205 // the incoming address with NULL casted away. You are allowed to use the
1206 // not-null value only if you are control dependent on the test.
1207 #ifndef PRODUCT
1208 extern int explicit_null_checks_inserted,
1209 explicit_null_checks_elided;
1210 #endif
1211 Node* GraphKit::null_check_common(Node* value, BasicType type,
1212 // optional arguments for variations:
1213 bool assert_null,
1214 Node* *null_control,
1215 bool speculative) {
1216 assert(!assert_null || null_control == NULL, "not both at once");
1217 if (stopped()) return top();
1218 NOT_PRODUCT(explicit_null_checks_inserted++);
1219
1220 // Construct NULL check
1221 Node *chk = NULL;
1222 switch(type) {
1223 case T_LONG : chk = new CmpLNode(value, _gvn.zerocon(T_LONG)); break;
1224 case T_INT : chk = new CmpINode(value, _gvn.intcon(0)); break;
1225 case T_VALUETYPE : // fall through
1226 case T_ARRAY : // fall through
1227 type = T_OBJECT; // simplify further tests
1228 case T_OBJECT : {
1229 const Type *t = _gvn.type( value );
1230
1231 const TypeOopPtr* tp = t->isa_oopptr();
1232 if (tp != NULL && tp->klass() != NULL && !tp->klass()->is_loaded()
1233 // Only for do_null_check, not any of its siblings:
1234 && !assert_null && null_control == NULL) {
1235 // Usually, any field access or invocation on an unloaded oop type
1236 // will simply fail to link, since the statically linked class is
1237 // likely also to be unloaded. However, in -Xcomp mode, sometimes
1238 // the static class is loaded but the sharper oop type is not.
1239 // Rather than checking for this obscure case in lots of places,
1240 // we simply observe that a null check on an unloaded class
1241 // will always be followed by a nonsense operation, so we
1242 // can just issue the uncommon trap here.
1243 // Our access to the unloaded class will only be correct
1244 // after it has been loaded and initialized, which requires
1245 // a trip through the interpreter.
1246 #ifndef PRODUCT
1247 if (WizardMode) { tty->print("Null check of unloaded "); tp->klass()->print(); tty->cr(); }
1248 #endif
1249 uncommon_trap(Deoptimization::Reason_unloaded,
1250 Deoptimization::Action_reinterpret,
1251 tp->klass(), "!loaded");
1252 return top();
1253 }
1254
1255 if (assert_null) {
1256 // See if the type is contained in NULL_PTR.
1257 // If so, then the value is already null.
1258 if (t->higher_equal(TypePtr::NULL_PTR)) {
1259 NOT_PRODUCT(explicit_null_checks_elided++);
1260 return value; // Elided null assert quickly!
1261 }
1262 } else {
1263 // See if mixing in the NULL pointer changes type.
1264 // If so, then the NULL pointer was not allowed in the original
1265 // type. In other words, "value" was not-null.
1266 if (t->meet(TypePtr::NULL_PTR) != t->remove_speculative()) {
1267 // same as: if (!TypePtr::NULL_PTR->higher_equal(t)) ...
1268 NOT_PRODUCT(explicit_null_checks_elided++);
1269 return value; // Elided null check quickly!
1270 }
1271 }
1272 chk = new CmpPNode( value, null() );
1273 break;
1274 }
1275
1276 default:
1277 fatal("unexpected type: %s", type2name(type));
1278 }
1279 assert(chk != NULL, "sanity check");
1280 chk = _gvn.transform(chk);
1281
1282 BoolTest::mask btest = assert_null ? BoolTest::eq : BoolTest::ne;
1283 BoolNode *btst = new BoolNode( chk, btest);
1284 Node *tst = _gvn.transform( btst );
1285
1286 //-----------
1287 // if peephole optimizations occurred, a prior test existed.
1288 // If a prior test existed, maybe it dominates as we can avoid this test.
1289 if (tst != btst && type == T_OBJECT) {
1290 // At this point we want to scan up the CFG to see if we can
1291 // find an identical test (and so avoid this test altogether).
1292 Node *cfg = control();
1293 int depth = 0;
1294 while( depth < 16 ) { // Limit search depth for speed
1295 if( cfg->Opcode() == Op_IfTrue &&
1296 cfg->in(0)->in(1) == tst ) {
1297 // Found prior test. Use "cast_not_null" to construct an identical
1298 // CastPP (and hence hash to) as already exists for the prior test.
1299 // Return that casted value.
1300 if (assert_null) {
1301 replace_in_map(value, null());
1302 return null(); // do not issue the redundant test
1303 }
1304 Node *oldcontrol = control();
1305 set_control(cfg);
1306 Node *res = cast_not_null(value);
1307 set_control(oldcontrol);
1308 NOT_PRODUCT(explicit_null_checks_elided++);
1309 return res;
1310 }
1311 cfg = IfNode::up_one_dom(cfg, /*linear_only=*/ true);
1312 if (cfg == NULL) break; // Quit at region nodes
1313 depth++;
1314 }
1315 }
1316
1317 //-----------
1318 // Branch to failure if null
1319 float ok_prob = PROB_MAX; // a priori estimate: nulls never happen
1320 Deoptimization::DeoptReason reason;
1321 if (assert_null) {
1322 reason = Deoptimization::reason_null_assert(speculative);
1323 } else if (type == T_OBJECT) {
1324 reason = Deoptimization::reason_null_check(speculative);
1325 } else {
1326 reason = Deoptimization::Reason_div0_check;
1327 }
1328 // %%% Since Reason_unhandled is not recorded on a per-bytecode basis,
1329 // ciMethodData::has_trap_at will return a conservative -1 if any
1330 // must-be-null assertion has failed. This could cause performance
1331 // problems for a method after its first do_null_assert failure.
1332 // Consider using 'Reason_class_check' instead?
1333
1334 // To cause an implicit null check, we set the not-null probability
1335 // to the maximum (PROB_MAX). For an explicit check the probability
1336 // is set to a smaller value.
1337 if (null_control != NULL || too_many_traps(reason)) {
1338 // probability is less likely
1339 ok_prob = PROB_LIKELY_MAG(3);
1340 } else if (!assert_null &&
1341 (ImplicitNullCheckThreshold > 0) &&
1342 method() != NULL &&
1343 (method()->method_data()->trap_count(reason)
1344 >= (uint)ImplicitNullCheckThreshold)) {
1345 ok_prob = PROB_LIKELY_MAG(3);
1346 }
1347
1348 if (null_control != NULL) {
1349 IfNode* iff = create_and_map_if(control(), tst, ok_prob, COUNT_UNKNOWN);
1350 Node* null_true = _gvn.transform( new IfFalseNode(iff));
1351 set_control( _gvn.transform( new IfTrueNode(iff)));
1352 #ifndef PRODUCT
1353 if (null_true == top()) {
1354 explicit_null_checks_elided++;
1355 }
1356 #endif
1357 (*null_control) = null_true;
1358 } else {
1359 BuildCutout unless(this, tst, ok_prob);
1360 // Check for optimizer eliding test at parse time
1361 if (stopped()) {
1362 // Failure not possible; do not bother making uncommon trap.
1363 NOT_PRODUCT(explicit_null_checks_elided++);
1364 } else if (assert_null) {
1365 uncommon_trap(reason,
1366 Deoptimization::Action_make_not_entrant,
1367 NULL, "assert_null");
1368 } else {
1369 replace_in_map(value, zerocon(type));
1370 builtin_throw(reason);
1371 }
1372 }
1373
1374 // Must throw exception, fall-thru not possible?
1375 if (stopped()) {
1376 return top(); // No result
1377 }
1378
1379 if (assert_null) {
1380 // Cast obj to null on this path.
1381 replace_in_map(value, zerocon(type));
1382 return zerocon(type);
1383 }
1384
1385 // Cast obj to not-null on this path, if there is no null_control.
1386 // (If there is a null_control, a non-null value may come back to haunt us.)
1387 if (type == T_OBJECT) {
1388 Node* cast = cast_not_null(value, false);
1389 if (null_control == NULL || (*null_control) == top())
1390 replace_in_map(value, cast);
1391 value = cast;
1392 }
1393
1394 return value;
1395 }
1396
1397 Node* GraphKit::null2default(Node* value, ciValueKlass* vk) {
1398 Node* null_ctl = top();
1399 value = null_check_oop(value, &null_ctl);
1400 if (!null_ctl->is_top()) {
1401 // Return default value if oop is null
1402 Node* region = new RegionNode(3);
1403 region->init_req(1, control());
1404 region->init_req(2, null_ctl);
1405 value = PhiNode::make(region, value, TypeInstPtr::make(TypePtr::BotPTR, vk));
1406 value->set_req(2, ValueTypeNode::default_oop(gvn(), vk));
1407 set_control(gvn().transform(region));
1408 value = gvn().transform(value);
1409 }
1410 return value;
1411 }
1412
1413 //------------------------------cast_not_null----------------------------------
1414 // Cast obj to not-null on this path
1415 Node* GraphKit::cast_not_null(Node* obj, bool do_replace_in_map) {
1416 if (obj->is_ValueType()) {
1417 return obj;
1418 }
1419 const Type *t = _gvn.type(obj);
1420 const Type *t_not_null = t->join_speculative(TypePtr::NOTNULL);
1421 // Object is already not-null?
1422 if( t == t_not_null ) return obj;
1423
1424 Node *cast = new CastPPNode(obj,t_not_null);
1425 cast->init_req(0, control());
1426 cast = _gvn.transform( cast );
1427
1428 // Scan for instances of 'obj' in the current JVM mapping.
1429 // These instances are known to be not-null after the test.
1430 if (do_replace_in_map)
1431 replace_in_map(obj, cast);
1432
1433 return cast; // Return casted value
1434 }
1435
1436 // Sometimes in intrinsics, we implicitly know an object is not null
1437 // (there's no actual null check) so we can cast it to not null. In
1438 // the course of optimizations, the input to the cast can become null.
1439 // In that case that data path will die and we need the control path
1440 // to become dead as well to keep the graph consistent. So we have to
1441 // add a check for null for which one branch can't be taken. It uses
1442 // an Opaque4 node that will cause the check to be removed after loop
1443 // opts so the test goes away and the compiled code doesn't execute a
1444 // useless check.
1445 Node* GraphKit::must_be_not_null(Node* value, bool do_replace_in_map) {
1446 Node* chk = _gvn.transform(new CmpPNode(value, null()));
1447 Node *tst = _gvn.transform(new BoolNode(chk, BoolTest::ne));
1448 Node* opaq = _gvn.transform(new Opaque4Node(C, tst, intcon(1)));
1449 IfNode *iff = new IfNode(control(), opaq, PROB_MAX, COUNT_UNKNOWN);
1450 _gvn.set_type(iff, iff->Value(&_gvn));
1451 Node *if_f = _gvn.transform(new IfFalseNode(iff));
1452 Node *frame = _gvn.transform(new ParmNode(C->start(), TypeFunc::FramePtr));
1453 Node *halt = _gvn.transform(new HaltNode(if_f, frame));
1454 C->root()->add_req(halt);
1455 Node *if_t = _gvn.transform(new IfTrueNode(iff));
1456 set_control(if_t);
1457 return cast_not_null(value, do_replace_in_map);
1458 }
1459
1460
1461 //--------------------------replace_in_map-------------------------------------
1462 void GraphKit::replace_in_map(Node* old, Node* neww) {
1463 if (old == neww) {
1464 return;
1465 }
1466
1467 map()->replace_edge(old, neww);
1468
1469 // Note: This operation potentially replaces any edge
1470 // on the map. This includes locals, stack, and monitors
1471 // of the current (innermost) JVM state.
1472
1473 // don't let inconsistent types from profiling escape this
1474 // method
1475
1476 const Type* told = _gvn.type(old);
1477 const Type* tnew = _gvn.type(neww);
1478
1479 if (!tnew->higher_equal(told)) {
1480 return;
1481 }
1482
1483 map()->record_replaced_node(old, neww);
1484 }
1485
1486
1487 //=============================================================================
1488 //--------------------------------memory---------------------------------------
1489 Node* GraphKit::memory(uint alias_idx) {
1490 MergeMemNode* mem = merged_memory();
1491 Node* p = mem->memory_at(alias_idx);
1492 _gvn.set_type(p, Type::MEMORY); // must be mapped
1493 return p;
1494 }
1495
1496 //-----------------------------reset_memory------------------------------------
1497 Node* GraphKit::reset_memory() {
1498 Node* mem = map()->memory();
1499 // do not use this node for any more parsing!
1500 debug_only( map()->set_memory((Node*)NULL) );
1501 return _gvn.transform( mem );
1502 }
1503
1504 //------------------------------set_all_memory---------------------------------
1505 void GraphKit::set_all_memory(Node* newmem) {
1506 Node* mergemem = MergeMemNode::make(newmem);
1507 gvn().set_type_bottom(mergemem);
1508 map()->set_memory(mergemem);
1509 }
1510
1511 //------------------------------set_all_memory_call----------------------------
1512 void GraphKit::set_all_memory_call(Node* call, bool separate_io_proj) {
1513 Node* newmem = _gvn.transform( new ProjNode(call, TypeFunc::Memory, separate_io_proj) );
1514 set_all_memory(newmem);
1515 }
1516
1517 //=============================================================================
1518 //
1519 // parser factory methods for MemNodes
1520 //
1521 // These are layered on top of the factory methods in LoadNode and StoreNode,
1522 // and integrate with the parser's memory state and _gvn engine.
1523 //
1524
1525 // factory methods in "int adr_idx"
1526 Node* GraphKit::make_load(Node* ctl, Node* adr, const Type* t, BasicType bt,
1527 int adr_idx,
1528 MemNode::MemOrd mo,
1529 LoadNode::ControlDependency control_dependency,
1530 bool require_atomic_access,
1531 bool unaligned,
1532 bool mismatched,
1533 bool unsafe) {
1534 assert(adr_idx != Compile::AliasIdxTop, "use other make_load factory" );
1535 const TypePtr* adr_type = NULL; // debug-mode-only argument
1536 debug_only(adr_type = C->get_adr_type(adr_idx));
1537 Node* mem = memory(adr_idx);
1538 Node* ld;
1539 if (require_atomic_access && bt == T_LONG) {
1540 ld = LoadLNode::make_atomic(ctl, mem, adr, adr_type, t, mo, control_dependency, unaligned, mismatched, unsafe);
1541 } else if (require_atomic_access && bt == T_DOUBLE) {
1542 ld = LoadDNode::make_atomic(ctl, mem, adr, adr_type, t, mo, control_dependency, unaligned, mismatched, unsafe);
1543 } else {
1544 ld = LoadNode::make(_gvn, ctl, mem, adr, adr_type, t, bt, mo, control_dependency, unaligned, mismatched, unsafe);
1545 }
1546 ld = _gvn.transform(ld);
1547
1548 if (((bt == T_OBJECT || bt == T_VALUETYPE) && C->do_escape_analysis()) || C->eliminate_boxing()) {
1549 // Improve graph before escape analysis and boxing elimination.
1550 record_for_igvn(ld);
1551 }
1552 return ld;
1553 }
1554
1555 Node* GraphKit::store_to_memory(Node* ctl, Node* adr, Node *val, BasicType bt,
1556 int adr_idx,
1557 MemNode::MemOrd mo,
1558 bool require_atomic_access,
1559 bool unaligned,
1560 bool mismatched,
1561 bool unsafe) {
1562 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" );
1563 const TypePtr* adr_type = NULL;
1564 debug_only(adr_type = C->get_adr_type(adr_idx));
1565 Node *mem = memory(adr_idx);
1566 Node* st;
1567 if (require_atomic_access && bt == T_LONG) {
1568 st = StoreLNode::make_atomic(ctl, mem, adr, adr_type, val, mo);
1569 } else if (require_atomic_access && bt == T_DOUBLE) {
1570 st = StoreDNode::make_atomic(ctl, mem, adr, adr_type, val, mo);
1571 } else {
1572 st = StoreNode::make(_gvn, ctl, mem, adr, adr_type, val, bt, mo);
1573 }
1574 if (unaligned) {
1575 st->as_Store()->set_unaligned_access();
1576 }
1577 if (mismatched) {
1578 st->as_Store()->set_mismatched_access();
1579 }
1580 if (unsafe) {
1581 st->as_Store()->set_unsafe_access();
1582 }
1583 st = _gvn.transform(st);
1584 set_memory(st, adr_idx);
1585 // Back-to-back stores can only remove intermediate store with DU info
1586 // so push on worklist for optimizer.
1587 if (mem->req() > MemNode::Address && adr == mem->in(MemNode::Address))
1588 record_for_igvn(st);
1589
1590 return st;
1591 }
1592
1593 Node* GraphKit::access_store_at(Node* obj,
1594 Node* adr,
1595 const TypePtr* adr_type,
1596 Node* val,
1597 const Type* val_type,
1598 BasicType bt,
1599 DecoratorSet decorators,
1600 bool deoptimize_on_exception) {
1601 // Transformation of a value which could be NULL pointer (CastPP #NULL)
1602 // could be delayed during Parse (for example, in adjust_map_after_if()).
1603 // Execute transformation here to avoid barrier generation in such case.
1604 if (_gvn.type(val) == TypePtr::NULL_PTR) {
1605 val = _gvn.makecon(TypePtr::NULL_PTR);
1606 }
1607
1608 if (stopped()) {
1609 return top(); // Dead path ?
1610 }
1611
1612 assert(val != NULL, "not dead path");
1613 if (val->is_ValueType()) {
1614 // Allocate value type and get oop
1615 val = val->as_ValueType()->allocate(this, deoptimize_on_exception)->get_oop();
1616 }
1617
1618 C2AccessValuePtr addr(adr, adr_type);
1619 C2AccessValue value(val, val_type);
1620 C2ParseAccess access(this, decorators | C2_WRITE_ACCESS, bt, obj, addr);
1621 if (access.is_raw()) {
1622 return _barrier_set->BarrierSetC2::store_at(access, value);
1623 } else {
1624 return _barrier_set->store_at(access, value);
1625 }
1626 }
1627
1628 Node* GraphKit::access_load_at(Node* obj, // containing obj
1629 Node* adr, // actual adress to store val at
1630 const TypePtr* adr_type,
1631 const Type* val_type,
1632 BasicType bt,
1633 DecoratorSet decorators) {
1634 if (stopped()) {
1635 return top(); // Dead path ?
1636 }
1637
1638 C2AccessValuePtr addr(adr, adr_type);
1639 C2ParseAccess access(this, decorators | C2_READ_ACCESS, bt, obj, addr);
1640 if (access.is_raw()) {
1641 return _barrier_set->BarrierSetC2::load_at(access, val_type);
1642 } else {
1643 return _barrier_set->load_at(access, val_type);
1644 }
1645 }
1646
1647 Node* GraphKit::access_load(Node* adr, // actual adress to load val at
1648 const Type* val_type,
1649 BasicType bt,
1650 DecoratorSet decorators) {
1651 if (stopped()) {
1652 return top(); // Dead path ?
1653 }
1654
1655 C2AccessValuePtr addr(adr, NULL);
1656 C2ParseAccess access(this, decorators | C2_READ_ACCESS, bt, NULL, addr);
1657 if (access.is_raw()) {
1658 return _barrier_set->BarrierSetC2::load_at(access, val_type);
1659 } else {
1660 return _barrier_set->load_at(access, val_type);
1661 }
1662 }
1663
1664 Node* GraphKit::access_atomic_cmpxchg_val_at(Node* obj,
1665 Node* adr,
1666 const TypePtr* adr_type,
1667 int alias_idx,
1668 Node* expected_val,
1669 Node* new_val,
1670 const Type* value_type,
1671 BasicType bt,
1672 DecoratorSet decorators) {
1673 C2AccessValuePtr addr(adr, adr_type);
1674 C2AtomicParseAccess access(this, decorators | C2_READ_ACCESS | C2_WRITE_ACCESS,
1675 bt, obj, addr, alias_idx);
1676 if (access.is_raw()) {
1677 return _barrier_set->BarrierSetC2::atomic_cmpxchg_val_at(access, expected_val, new_val, value_type);
1678 } else {
1679 return _barrier_set->atomic_cmpxchg_val_at(access, expected_val, new_val, value_type);
1680 }
1681 }
1682
1683 Node* GraphKit::access_atomic_cmpxchg_bool_at(Node* obj,
1684 Node* adr,
1685 const TypePtr* adr_type,
1686 int alias_idx,
1687 Node* expected_val,
1688 Node* new_val,
1689 const Type* value_type,
1690 BasicType bt,
1691 DecoratorSet decorators) {
1692 C2AccessValuePtr addr(adr, adr_type);
1693 C2AtomicParseAccess access(this, decorators | C2_READ_ACCESS | C2_WRITE_ACCESS,
1694 bt, obj, addr, alias_idx);
1695 if (access.is_raw()) {
1696 return _barrier_set->BarrierSetC2::atomic_cmpxchg_bool_at(access, expected_val, new_val, value_type);
1697 } else {
1698 return _barrier_set->atomic_cmpxchg_bool_at(access, expected_val, new_val, value_type);
1699 }
1700 }
1701
1702 Node* GraphKit::access_atomic_xchg_at(Node* obj,
1703 Node* adr,
1704 const TypePtr* adr_type,
1705 int alias_idx,
1706 Node* new_val,
1707 const Type* value_type,
1708 BasicType bt,
1709 DecoratorSet decorators) {
1710 C2AccessValuePtr addr(adr, adr_type);
1711 C2AtomicParseAccess access(this, decorators | C2_READ_ACCESS | C2_WRITE_ACCESS,
1712 bt, obj, addr, alias_idx);
1713 if (access.is_raw()) {
1714 return _barrier_set->BarrierSetC2::atomic_xchg_at(access, new_val, value_type);
1715 } else {
1716 return _barrier_set->atomic_xchg_at(access, new_val, value_type);
1717 }
1718 }
1719
1720 Node* GraphKit::access_atomic_add_at(Node* obj,
1721 Node* adr,
1722 const TypePtr* adr_type,
1723 int alias_idx,
1724 Node* new_val,
1725 const Type* value_type,
1726 BasicType bt,
1727 DecoratorSet decorators) {
1728 C2AccessValuePtr addr(adr, adr_type);
1729 C2AtomicParseAccess access(this, decorators | C2_READ_ACCESS | C2_WRITE_ACCESS, bt, obj, addr, alias_idx);
1730 if (access.is_raw()) {
1731 return _barrier_set->BarrierSetC2::atomic_add_at(access, new_val, value_type);
1732 } else {
1733 return _barrier_set->atomic_add_at(access, new_val, value_type);
1734 }
1735 }
1736
1737 void GraphKit::access_clone(Node* src_base, Node* dst_base, Node* countx, bool is_array) {
1738 return _barrier_set->clone(this, src_base, dst_base, countx, is_array);
1739 }
1740
1741 Node* GraphKit::access_resolve(Node* n, DecoratorSet decorators) {
1742 // Use stronger ACCESS_WRITE|ACCESS_READ by default.
1743 if ((decorators & (ACCESS_READ | ACCESS_WRITE)) == 0) {
1744 decorators |= ACCESS_READ | ACCESS_WRITE;
1745 }
1746 return _barrier_set->resolve(this, n, decorators);
1747 }
1748
1749 //-------------------------array_element_address-------------------------
1750 Node* GraphKit::array_element_address(Node* ary, Node* idx, BasicType elembt,
1751 const TypeInt* sizetype, Node* ctrl) {
1752 uint shift = exact_log2(type2aelembytes(elembt));
1753 ciKlass* arytype_klass = _gvn.type(ary)->is_aryptr()->klass();
1754 if (arytype_klass->is_value_array_klass()) {
1755 ciValueArrayKlass* vak = arytype_klass->as_value_array_klass();
1756 shift = vak->log2_element_size();
1757 }
1758 uint header = arrayOopDesc::base_offset_in_bytes(elembt);
1759
1760 // short-circuit a common case (saves lots of confusing waste motion)
1761 jint idx_con = find_int_con(idx, -1);
1762 if (idx_con >= 0) {
1763 intptr_t offset = header + ((intptr_t)idx_con << shift);
1764 return basic_plus_adr(ary, offset);
1765 }
1766
1767 // must be correct type for alignment purposes
1768 Node* base = basic_plus_adr(ary, header);
1769 idx = Compile::conv_I2X_index(&_gvn, idx, sizetype, ctrl);
1770 Node* scale = _gvn.transform( new LShiftXNode(idx, intcon(shift)) );
1771 return basic_plus_adr(ary, base, scale);
1772 }
1773
1774 //-------------------------load_array_element-------------------------
1775 Node* GraphKit::load_array_element(Node* ctl, Node* ary, Node* idx, const TypeAryPtr* arytype) {
1776 const Type* elemtype = arytype->elem();
1777 BasicType elembt = elemtype->array_element_basic_type();
1778 assert(elembt != T_VALUETYPE, "value types are not supported by this method");
1779 Node* adr = array_element_address(ary, idx, elembt, arytype->size());
1780 if (elembt == T_NARROWOOP) {
1781 elembt = T_OBJECT; // To satisfy switch in LoadNode::make()
1782 }
1783 Node* ld = make_load(ctl, adr, elemtype, elembt, arytype, MemNode::unordered);
1784 return ld;
1785 }
1786
1787 //-------------------------set_arguments_for_java_call-------------------------
1788 // Arguments (pre-popped from the stack) are taken from the JVMS.
1789 void GraphKit::set_arguments_for_java_call(CallJavaNode* call, bool incremental_inlining) {
1790 // Add the call arguments:
1791 const TypeTuple* domain = call->tf()->domain_sig();
1792 ExtendedSignature sig_cc = ExtendedSignature(call->method()->get_sig_cc(), SigEntryFilter());
1793 uint nargs = domain->cnt();
1794 for (uint i = TypeFunc::Parms, idx = TypeFunc::Parms; i < nargs; i++) {
1795 Node* arg = argument(i-TypeFunc::Parms);
1796 const Type* t = domain->field_at(i);
1797 if (call->method()->has_scalarized_args() && t->is_valuetypeptr() && !t->maybe_null()) {
1798 // We don't pass value type arguments by reference but instead
1799 // pass each field of the value type
1800 ValueTypeNode* vt = arg->isa_ValueType();
1801 if (vt == NULL) {
1802 // TODO why is that?? Shouldn't we always see a valuetype node here?
1803 vt = ValueTypeNode::make_from_oop(this, arg, t->value_klass());
1804 }
1805 vt->pass_fields(this, call, sig_cc, idx);
1806 // If a value type argument is passed as fields, attach the Method* to the call site
1807 // to be able to access the extended signature later via attached_method_before_pc().
1808 // For example, see CompiledMethod::preserve_callee_argument_oops().
1809 call->set_override_symbolic_info(true);
1810 continue;
1811 } else if (arg->is_ValueType()) {
1812 // Pass value type argument via oop to callee
1813 if (!incremental_inlining) {
1814 arg = arg->as_ValueType()->allocate(this)->get_oop();
1815 } else {
1816 arg = ValueTypePtrNode::make_from_value_type(this, arg->as_ValueType(), false);
1817 }
1818 }
1819 call->init_req(idx++, arg);
1820 // Skip reserved arguments
1821 BasicType bt = t->basic_type();
1822 while (SigEntry::next_is_reserved(sig_cc, bt, true)) {
1823 call->init_req(idx++, top());
1824 if (type2size[bt] == 2) {
1825 call->init_req(idx++, top());
1826 }
1827 }
1828 }
1829 }
1830
1831 //---------------------------set_edges_for_java_call---------------------------
1832 // Connect a newly created call into the current JVMS.
1833 // A return value node (if any) is returned from set_edges_for_java_call.
1834 void GraphKit::set_edges_for_java_call(CallJavaNode* call, bool must_throw, bool separate_io_proj) {
1835
1836 // Add the predefined inputs:
1837 call->init_req( TypeFunc::Control, control() );
1838 call->init_req( TypeFunc::I_O , i_o() );
1839 call->init_req( TypeFunc::Memory , reset_memory() );
1840 call->init_req( TypeFunc::FramePtr, frameptr() );
1841 call->init_req( TypeFunc::ReturnAdr, top() );
1842
1843 add_safepoint_edges(call, must_throw);
1844
1845 Node* xcall = _gvn.transform(call);
1846
1847 if (xcall == top()) {
1848 set_control(top());
1849 return;
1850 }
1851 assert(xcall == call, "call identity is stable");
1852
1853 // Re-use the current map to produce the result.
1854
1855 set_control(_gvn.transform(new ProjNode(call, TypeFunc::Control)));
1856 set_i_o( _gvn.transform(new ProjNode(call, TypeFunc::I_O , separate_io_proj)));
1857 set_all_memory_call(xcall, separate_io_proj);
1858
1859 //return xcall; // no need, caller already has it
1860 }
1861
1862 Node* GraphKit::set_results_for_java_call(CallJavaNode* call, bool separate_io_proj, bool deoptimize) {
1863 if (stopped()) return top(); // maybe the call folded up?
1864
1865 // Note: Since any out-of-line call can produce an exception,
1866 // we always insert an I_O projection from the call into the result.
1867
1868 make_slow_call_ex(call, env()->Throwable_klass(), separate_io_proj, deoptimize);
1869
1870 if (separate_io_proj) {
1871 // The caller requested separate projections be used by the fall
1872 // through and exceptional paths, so replace the projections for
1873 // the fall through path.
1874 set_i_o(_gvn.transform( new ProjNode(call, TypeFunc::I_O) ));
1875 set_all_memory(_gvn.transform( new ProjNode(call, TypeFunc::Memory) ));
1876 }
1877
1878 // Capture the return value, if any.
1879 Node* ret;
1880 if (call->method() == NULL || call->method()->return_type()->basic_type() == T_VOID) {
1881 ret = top();
1882 } else if (call->tf()->returns_value_type_as_fields()) {
1883 // Return of multiple values (value type fields): we create a
1884 // ValueType node, each field is a projection from the call.
1885 ciValueKlass* vk = call->method()->return_type()->as_value_klass();
1886 const Array<SigEntry>* sig_array = vk->extended_sig();
1887 GrowableArray<SigEntry> sig = GrowableArray<SigEntry>(sig_array->length());
1888 sig.appendAll(sig_array);
1889 ExtendedSignature sig_cc = ExtendedSignature(&sig, SigEntryFilter());
1890 uint base_input = TypeFunc::Parms + 1;
1891 ret = ValueTypeNode::make_from_multi(this, call, sig_cc, vk, base_input, false);
1892 } else {
1893 ret = _gvn.transform(new ProjNode(call, TypeFunc::Parms));
1894 }
1895
1896 return ret;
1897 }
1898
1899 //--------------------set_predefined_input_for_runtime_call--------------------
1900 // Reading and setting the memory state is way conservative here.
1901 // The real problem is that I am not doing real Type analysis on memory,
1902 // so I cannot distinguish card mark stores from other stores. Across a GC
1903 // point the Store Barrier and the card mark memory has to agree. I cannot
1904 // have a card mark store and its barrier split across the GC point from
1905 // either above or below. Here I get that to happen by reading ALL of memory.
1906 // A better answer would be to separate out card marks from other memory.
1907 // For now, return the input memory state, so that it can be reused
1908 // after the call, if this call has restricted memory effects.
1909 Node* GraphKit::set_predefined_input_for_runtime_call(SafePointNode* call, Node* narrow_mem) {
1910 // Set fixed predefined input arguments
1911 Node* memory = reset_memory();
1912 Node* m = narrow_mem == NULL ? memory : narrow_mem;
1913 call->init_req( TypeFunc::Control, control() );
1914 call->init_req( TypeFunc::I_O, top() ); // does no i/o
1915 call->init_req( TypeFunc::Memory, m ); // may gc ptrs
1916 call->init_req( TypeFunc::FramePtr, frameptr() );
1917 call->init_req( TypeFunc::ReturnAdr, top() );
1918 return memory;
1919 }
1920
1921 //-------------------set_predefined_output_for_runtime_call--------------------
1922 // Set control and memory (not i_o) from the call.
1923 // If keep_mem is not NULL, use it for the output state,
1924 // except for the RawPtr output of the call, if hook_mem is TypeRawPtr::BOTTOM.
1925 // If hook_mem is NULL, this call produces no memory effects at all.
1926 // If hook_mem is a Java-visible memory slice (such as arraycopy operands),
1927 // then only that memory slice is taken from the call.
1928 // In the last case, we must put an appropriate memory barrier before
1929 // the call, so as to create the correct anti-dependencies on loads
1930 // preceding the call.
1931 void GraphKit::set_predefined_output_for_runtime_call(Node* call,
1932 Node* keep_mem,
1933 const TypePtr* hook_mem) {
1934 // no i/o
1935 set_control(_gvn.transform( new ProjNode(call,TypeFunc::Control) ));
1936 if (keep_mem) {
1937 // First clone the existing memory state
1938 set_all_memory(keep_mem);
1939 if (hook_mem != NULL) {
1940 // Make memory for the call
1941 Node* mem = _gvn.transform( new ProjNode(call, TypeFunc::Memory) );
1942 // Set the RawPtr memory state only. This covers all the heap top/GC stuff
1943 // We also use hook_mem to extract specific effects from arraycopy stubs.
1944 set_memory(mem, hook_mem);
1945 }
1946 // ...else the call has NO memory effects.
1947
1948 // Make sure the call advertises its memory effects precisely.
1949 // This lets us build accurate anti-dependences in gcm.cpp.
1950 assert(C->alias_type(call->adr_type()) == C->alias_type(hook_mem),
1951 "call node must be constructed correctly");
1952 } else {
1953 assert(hook_mem == NULL, "");
1954 // This is not a "slow path" call; all memory comes from the call.
1955 set_all_memory_call(call);
1956 }
1957 }
1958
1959
1960 // Replace the call with the current state of the kit.
1961 void GraphKit::replace_call(CallNode* call, Node* result, bool do_replaced_nodes) {
1962 JVMState* ejvms = NULL;
1963 if (has_exceptions()) {
1964 ejvms = transfer_exceptions_into_jvms();
1965 }
1966
1967 ReplacedNodes replaced_nodes = map()->replaced_nodes();
1968 ReplacedNodes replaced_nodes_exception;
1969 Node* ex_ctl = top();
1970
1971 SafePointNode* final_state = stop();
1972
1973 // Find all the needed outputs of this call
1974 CallProjections* callprojs = call->extract_projections(true);
1975
1976 Node* init_mem = call->in(TypeFunc::Memory);
1977 Node* final_mem = final_state->in(TypeFunc::Memory);
1978 Node* final_ctl = final_state->in(TypeFunc::Control);
1979 Node* final_io = final_state->in(TypeFunc::I_O);
1980
1981 // Replace all the old call edges with the edges from the inlining result
1982 if (callprojs->fallthrough_catchproj != NULL) {
1983 C->gvn_replace_by(callprojs->fallthrough_catchproj, final_ctl);
1984 }
1985 if (callprojs->fallthrough_memproj != NULL) {
1986 if (final_mem->is_MergeMem()) {
1987 // Parser's exits MergeMem was not transformed but may be optimized
1988 final_mem = _gvn.transform(final_mem);
1989 }
1990 C->gvn_replace_by(callprojs->fallthrough_memproj, final_mem);
1991 }
1992 if (callprojs->fallthrough_ioproj != NULL) {
1993 C->gvn_replace_by(callprojs->fallthrough_ioproj, final_io);
1994 }
1995
1996 // Replace the result with the new result if it exists and is used
1997 if (callprojs->resproj[0] != NULL && result != NULL) {
1998 assert(callprojs->nb_resproj == 1, "unexpected number of results");
1999 C->gvn_replace_by(callprojs->resproj[0], result);
2000 }
2001
2002 if (ejvms == NULL) {
2003 // No exception edges to simply kill off those paths
2004 if (callprojs->catchall_catchproj != NULL) {
2005 C->gvn_replace_by(callprojs->catchall_catchproj, C->top());
2006 }
2007 if (callprojs->catchall_memproj != NULL) {
2008 C->gvn_replace_by(callprojs->catchall_memproj, C->top());
2009 }
2010 if (callprojs->catchall_ioproj != NULL) {
2011 C->gvn_replace_by(callprojs->catchall_ioproj, C->top());
2012 }
2013 // Replace the old exception object with top
2014 if (callprojs->exobj != NULL) {
2015 C->gvn_replace_by(callprojs->exobj, C->top());
2016 }
2017 } else {
2018 GraphKit ekit(ejvms);
2019
2020 // Load my combined exception state into the kit, with all phis transformed:
2021 SafePointNode* ex_map = ekit.combine_and_pop_all_exception_states();
2022 replaced_nodes_exception = ex_map->replaced_nodes();
2023
2024 Node* ex_oop = ekit.use_exception_state(ex_map);
2025
2026 if (callprojs->catchall_catchproj != NULL) {
2027 C->gvn_replace_by(callprojs->catchall_catchproj, ekit.control());
2028 ex_ctl = ekit.control();
2029 }
2030 if (callprojs->catchall_memproj != NULL) {
2031 C->gvn_replace_by(callprojs->catchall_memproj, ekit.reset_memory());
2032 }
2033 if (callprojs->catchall_ioproj != NULL) {
2034 C->gvn_replace_by(callprojs->catchall_ioproj, ekit.i_o());
2035 }
2036
2037 // Replace the old exception object with the newly created one
2038 if (callprojs->exobj != NULL) {
2039 C->gvn_replace_by(callprojs->exobj, ex_oop);
2040 }
2041 }
2042
2043 // Disconnect the call from the graph
2044 call->disconnect_inputs(NULL, C);
2045 C->gvn_replace_by(call, C->top());
2046
2047 // Clean up any MergeMems that feed other MergeMems since the
2048 // optimizer doesn't like that.
2049 if (final_mem->is_MergeMem()) {
2050 Node_List wl;
2051 for (SimpleDUIterator i(final_mem); i.has_next(); i.next()) {
2052 Node* m = i.get();
2053 if (m->is_MergeMem() && !wl.contains(m)) {
2054 wl.push(m);
2055 }
2056 }
2057 while (wl.size() > 0) {
2058 _gvn.transform(wl.pop());
2059 }
2060 }
2061
2062 if (callprojs->fallthrough_catchproj != NULL && !final_ctl->is_top() && do_replaced_nodes) {
2063 replaced_nodes.apply(C, final_ctl);
2064 }
2065 if (!ex_ctl->is_top() && do_replaced_nodes) {
2066 replaced_nodes_exception.apply(C, ex_ctl);
2067 }
2068 }
2069
2070
2071 //------------------------------increment_counter------------------------------
2072 // for statistics: increment a VM counter by 1
2073
2074 void GraphKit::increment_counter(address counter_addr) {
2075 Node* adr1 = makecon(TypeRawPtr::make(counter_addr));
2076 increment_counter(adr1);
2077 }
2078
2079 void GraphKit::increment_counter(Node* counter_addr) {
2080 int adr_type = Compile::AliasIdxRaw;
2081 Node* ctrl = control();
2082 Node* cnt = make_load(ctrl, counter_addr, TypeInt::INT, T_INT, adr_type, MemNode::unordered);
2083 Node* incr = _gvn.transform(new AddINode(cnt, _gvn.intcon(1)));
2084 store_to_memory(ctrl, counter_addr, incr, T_INT, adr_type, MemNode::unordered);
2085 }
2086
2087
2088 //------------------------------uncommon_trap----------------------------------
2089 // Bail out to the interpreter in mid-method. Implemented by calling the
2090 // uncommon_trap blob. This helper function inserts a runtime call with the
2091 // right debug info.
2092 void GraphKit::uncommon_trap(int trap_request,
2093 ciKlass* klass, const char* comment,
2094 bool must_throw,
2095 bool keep_exact_action) {
2096 if (failing()) stop();
2097 if (stopped()) return; // trap reachable?
2098
2099 // Note: If ProfileTraps is true, and if a deopt. actually
2100 // occurs here, the runtime will make sure an MDO exists. There is
2101 // no need to call method()->ensure_method_data() at this point.
2102
2103 // Set the stack pointer to the right value for reexecution:
2104 set_sp(reexecute_sp());
2105
2106 #ifdef ASSERT
2107 if (!must_throw) {
2108 // Make sure the stack has at least enough depth to execute
2109 // the current bytecode.
2110 int inputs, ignored_depth;
2111 if (compute_stack_effects(inputs, ignored_depth)) {
2112 assert(sp() >= inputs, "must have enough JVMS stack to execute %s: sp=%d, inputs=%d",
2113 Bytecodes::name(java_bc()), sp(), inputs);
2114 }
2115 }
2116 #endif
2117
2118 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request);
2119 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request);
2120
2121 switch (action) {
2122 case Deoptimization::Action_maybe_recompile:
2123 case Deoptimization::Action_reinterpret:
2124 // Temporary fix for 6529811 to allow virtual calls to be sure they
2125 // get the chance to go from mono->bi->mega
2126 if (!keep_exact_action &&
2127 Deoptimization::trap_request_index(trap_request) < 0 &&
2128 too_many_recompiles(reason)) {
2129 // This BCI is causing too many recompilations.
2130 if (C->log() != NULL) {
2131 C->log()->elem("observe that='trap_action_change' reason='%s' from='%s' to='none'",
2132 Deoptimization::trap_reason_name(reason),
2133 Deoptimization::trap_action_name(action));
2134 }
2135 action = Deoptimization::Action_none;
2136 trap_request = Deoptimization::make_trap_request(reason, action);
2137 } else {
2138 C->set_trap_can_recompile(true);
2139 }
2140 break;
2141 case Deoptimization::Action_make_not_entrant:
2142 C->set_trap_can_recompile(true);
2143 break;
2144 case Deoptimization::Action_none:
2145 case Deoptimization::Action_make_not_compilable:
2146 break;
2147 default:
2148 #ifdef ASSERT
2149 fatal("unknown action %d: %s", action, Deoptimization::trap_action_name(action));
2150 #endif
2151 break;
2152 }
2153
2154 if (TraceOptoParse) {
2155 char buf[100];
2156 tty->print_cr("Uncommon trap %s at bci:%d",
2157 Deoptimization::format_trap_request(buf, sizeof(buf),
2158 trap_request), bci());
2159 }
2160
2161 CompileLog* log = C->log();
2162 if (log != NULL) {
2163 int kid = (klass == NULL)? -1: log->identify(klass);
2164 log->begin_elem("uncommon_trap bci='%d'", bci());
2165 char buf[100];
2166 log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf),
2167 trap_request));
2168 if (kid >= 0) log->print(" klass='%d'", kid);
2169 if (comment != NULL) log->print(" comment='%s'", comment);
2170 log->end_elem();
2171 }
2172
2173 // Make sure any guarding test views this path as very unlikely
2174 Node *i0 = control()->in(0);
2175 if (i0 != NULL && i0->is_If()) { // Found a guarding if test?
2176 IfNode *iff = i0->as_If();
2177 float f = iff->_prob; // Get prob
2178 if (control()->Opcode() == Op_IfTrue) {
2179 if (f > PROB_UNLIKELY_MAG(4))
2180 iff->_prob = PROB_MIN;
2181 } else {
2182 if (f < PROB_LIKELY_MAG(4))
2183 iff->_prob = PROB_MAX;
2184 }
2185 }
2186
2187 // Clear out dead values from the debug info.
2188 kill_dead_locals();
2189
2190 // Now insert the uncommon trap subroutine call
2191 address call_addr = SharedRuntime::uncommon_trap_blob()->entry_point();
2192 const TypePtr* no_memory_effects = NULL;
2193 // Pass the index of the class to be loaded
2194 Node* call = make_runtime_call(RC_NO_LEAF | RC_UNCOMMON |
2195 (must_throw ? RC_MUST_THROW : 0),
2196 OptoRuntime::uncommon_trap_Type(),
2197 call_addr, "uncommon_trap", no_memory_effects,
2198 intcon(trap_request));
2199 assert(call->as_CallStaticJava()->uncommon_trap_request() == trap_request,
2200 "must extract request correctly from the graph");
2201 assert(trap_request != 0, "zero value reserved by uncommon_trap_request");
2202
2203 call->set_req(TypeFunc::ReturnAdr, returnadr());
2204 // The debug info is the only real input to this call.
2205
2206 // Halt-and-catch fire here. The above call should never return!
2207 HaltNode* halt = new HaltNode(control(), frameptr());
2208 _gvn.set_type_bottom(halt);
2209 root()->add_req(halt);
2210
2211 stop_and_kill_map();
2212 }
2213
2214
2215 //--------------------------just_allocated_object------------------------------
2216 // Report the object that was just allocated.
2217 // It must be the case that there are no intervening safepoints.
2218 // We use this to determine if an object is so "fresh" that
2219 // it does not require card marks.
2220 Node* GraphKit::just_allocated_object(Node* current_control) {
2221 Node* ctrl = current_control;
2222 // Object::<init> is invoked after allocation, most of invoke nodes
2223 // will be reduced, but a region node is kept in parse time, we check
2224 // the pattern and skip the region node if it degraded to a copy.
2225 if (ctrl != NULL && ctrl->is_Region() && ctrl->req() == 2 &&
2226 ctrl->as_Region()->is_copy()) {
2227 ctrl = ctrl->as_Region()->is_copy();
2228 }
2229 if (C->recent_alloc_ctl() == ctrl) {
2230 return C->recent_alloc_obj();
2231 }
2232 return NULL;
2233 }
2234
2235
2236 void GraphKit::round_double_arguments(ciMethod* dest_method) {
2237 // (Note: TypeFunc::make has a cache that makes this fast.)
2238 const TypeFunc* tf = TypeFunc::make(dest_method);
2239 int nargs = tf->domain_sig()->cnt() - TypeFunc::Parms;
2240 for (int j = 0; j < nargs; j++) {
2241 const Type *targ = tf->domain_sig()->field_at(j + TypeFunc::Parms);
2242 if( targ->basic_type() == T_DOUBLE ) {
2243 // If any parameters are doubles, they must be rounded before
2244 // the call, dstore_rounding does gvn.transform
2245 Node *arg = argument(j);
2246 arg = dstore_rounding(arg);
2247 set_argument(j, arg);
2248 }
2249 }
2250 }
2251
2252 /**
2253 * Record profiling data exact_kls for Node n with the type system so
2254 * that it can propagate it (speculation)
2255 *
2256 * @param n node that the type applies to
2257 * @param exact_kls type from profiling
2258 * @param maybe_null did profiling see null?
2259 *
2260 * @return node with improved type
2261 */
2262 Node* GraphKit::record_profile_for_speculation(Node* n, ciKlass* exact_kls, ProfilePtrKind ptr_kind) {
2263 const Type* current_type = _gvn.type(n);
2264 assert(UseTypeSpeculation, "type speculation must be on");
2265
2266 const TypePtr* speculative = current_type->speculative();
2267
2268 // Should the klass from the profile be recorded in the speculative type?
2269 if (current_type->would_improve_type(exact_kls, jvms()->depth())) {
2270 const TypeKlassPtr* tklass = TypeKlassPtr::make(exact_kls);
2271 const TypeOopPtr* xtype = tklass->as_instance_type();
2272 assert(xtype->klass_is_exact(), "Should be exact");
2273 // Any reason to believe n is not null (from this profiling or a previous one)?
2274 assert(ptr_kind != ProfileAlwaysNull, "impossible here");
2275 const TypePtr* ptr = (ptr_kind == ProfileMaybeNull && current_type->speculative_maybe_null()) ? TypePtr::BOTTOM : TypePtr::NOTNULL;
2276 // record the new speculative type's depth
2277 speculative = xtype->cast_to_ptr_type(ptr->ptr())->is_ptr();
2278 speculative = speculative->with_inline_depth(jvms()->depth());
2279 } else if (current_type->would_improve_ptr(ptr_kind)) {
2280 // Profiling report that null was never seen so we can change the
2281 // speculative type to non null ptr.
2282 if (ptr_kind == ProfileAlwaysNull) {
2283 speculative = TypePtr::NULL_PTR;
2284 } else {
2285 assert(ptr_kind == ProfileNeverNull, "nothing else is an improvement");
2286 const TypePtr* ptr = TypePtr::NOTNULL;
2287 if (speculative != NULL) {
2288 speculative = speculative->cast_to_ptr_type(ptr->ptr())->is_ptr();
2289 } else {
2290 speculative = ptr;
2291 }
2292 }
2293 }
2294
2295 if (speculative != current_type->speculative()) {
2296 // Build a type with a speculative type (what we think we know
2297 // about the type but will need a guard when we use it)
2298 const TypeOopPtr* spec_type = TypeOopPtr::make(TypePtr::BotPTR, Type::Offset::bottom, TypeOopPtr::InstanceBot, speculative);
2299 // We're changing the type, we need a new CheckCast node to carry
2300 // the new type. The new type depends on the control: what
2301 // profiling tells us is only valid from here as far as we can
2302 // tell.
2303 Node* cast = new CheckCastPPNode(control(), n, current_type->remove_speculative()->join_speculative(spec_type));
2304 cast = _gvn.transform(cast);
2305 replace_in_map(n, cast);
2306 n = cast;
2307 }
2308
2309 return n;
2310 }
2311
2312 /**
2313 * Record profiling data from receiver profiling at an invoke with the
2314 * type system so that it can propagate it (speculation)
2315 *
2316 * @param n receiver node
2317 *
2318 * @return node with improved type
2319 */
2320 Node* GraphKit::record_profiled_receiver_for_speculation(Node* n) {
2321 if (!UseTypeSpeculation) {
2322 return n;
2323 }
2324 ciKlass* exact_kls = profile_has_unique_klass();
2325 ProfilePtrKind ptr_kind = ProfileMaybeNull;
2326 if ((java_bc() == Bytecodes::_checkcast ||
2327 java_bc() == Bytecodes::_instanceof ||
2328 java_bc() == Bytecodes::_aastore) &&
2329 method()->method_data()->is_mature()) {
2330 ciProfileData* data = method()->method_data()->bci_to_data(bci());
2331 if (data != NULL) {
2332 if (!data->as_BitData()->null_seen()) {
2333 ptr_kind = ProfileNeverNull;
2334 } else {
2335 assert(data->is_ReceiverTypeData(), "bad profile data type");
2336 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
2337 uint i = 0;
2338 for (; i < call->row_limit(); i++) {
2339 ciKlass* receiver = call->receiver(i);
2340 if (receiver != NULL) {
2341 break;
2342 }
2343 }
2344 ptr_kind = (i == call->row_limit()) ? ProfileAlwaysNull : ProfileMaybeNull;
2345 }
2346 }
2347 }
2348 return record_profile_for_speculation(n, exact_kls, ptr_kind);
2349 }
2350
2351 /**
2352 * Record profiling data from argument profiling at an invoke with the
2353 * type system so that it can propagate it (speculation)
2354 *
2355 * @param dest_method target method for the call
2356 * @param bc what invoke bytecode is this?
2357 */
2358 void GraphKit::record_profiled_arguments_for_speculation(ciMethod* dest_method, Bytecodes::Code bc) {
2359 if (!UseTypeSpeculation) {
2360 return;
2361 }
2362 const TypeFunc* tf = TypeFunc::make(dest_method);
2363 int nargs = tf->domain_sig()->cnt() - TypeFunc::Parms;
2364 int skip = Bytecodes::has_receiver(bc) ? 1 : 0;
2365 for (int j = skip, i = 0; j < nargs && i < TypeProfileArgsLimit; j++) {
2366 const Type *targ = tf->domain_sig()->field_at(j + TypeFunc::Parms);
2367 if (targ->isa_oopptr()) {
2368 ProfilePtrKind ptr_kind = ProfileMaybeNull;
2369 ciKlass* better_type = NULL;
2370 if (method()->argument_profiled_type(bci(), i, better_type, ptr_kind)) {
2371 record_profile_for_speculation(argument(j), better_type, ptr_kind);
2372 }
2373 i++;
2374 }
2375 }
2376 }
2377
2378 /**
2379 * Record profiling data from parameter profiling at an invoke with
2380 * the type system so that it can propagate it (speculation)
2381 */
2382 void GraphKit::record_profiled_parameters_for_speculation() {
2383 if (!UseTypeSpeculation) {
2384 return;
2385 }
2386 for (int i = 0, j = 0; i < method()->arg_size() ; i++) {
2387 if (_gvn.type(local(i))->isa_oopptr()) {
2388 ProfilePtrKind ptr_kind = ProfileMaybeNull;
2389 ciKlass* better_type = NULL;
2390 if (method()->parameter_profiled_type(j, better_type, ptr_kind)) {
2391 record_profile_for_speculation(local(i), better_type, ptr_kind);
2392 }
2393 j++;
2394 }
2395 }
2396 }
2397
2398 /**
2399 * Record profiling data from return value profiling at an invoke with
2400 * the type system so that it can propagate it (speculation)
2401 */
2402 void GraphKit::record_profiled_return_for_speculation() {
2403 if (!UseTypeSpeculation) {
2404 return;
2405 }
2406 ProfilePtrKind ptr_kind = ProfileMaybeNull;
2407 ciKlass* better_type = NULL;
2408 if (method()->return_profiled_type(bci(), better_type, ptr_kind)) {
2409 // If profiling reports a single type for the return value,
2410 // feed it to the type system so it can propagate it as a
2411 // speculative type
2412 record_profile_for_speculation(stack(sp()-1), better_type, ptr_kind);
2413 }
2414 }
2415
2416 void GraphKit::round_double_result(ciMethod* dest_method) {
2417 // A non-strict method may return a double value which has an extended
2418 // exponent, but this must not be visible in a caller which is 'strict'
2419 // If a strict caller invokes a non-strict callee, round a double result
2420
2421 BasicType result_type = dest_method->return_type()->basic_type();
2422 assert( method() != NULL, "must have caller context");
2423 if( result_type == T_DOUBLE && method()->is_strict() && !dest_method->is_strict() ) {
2424 // Destination method's return value is on top of stack
2425 // dstore_rounding() does gvn.transform
2426 Node *result = pop_pair();
2427 result = dstore_rounding(result);
2428 push_pair(result);
2429 }
2430 }
2431
2432 // rounding for strict float precision conformance
2433 Node* GraphKit::precision_rounding(Node* n) {
2434 return UseStrictFP && _method->flags().is_strict()
2435 && UseSSE == 0 && Matcher::strict_fp_requires_explicit_rounding
2436 ? _gvn.transform( new RoundFloatNode(0, n) )
2437 : n;
2438 }
2439
2440 // rounding for strict double precision conformance
2441 Node* GraphKit::dprecision_rounding(Node *n) {
2442 return UseStrictFP && _method->flags().is_strict()
2443 && UseSSE <= 1 && Matcher::strict_fp_requires_explicit_rounding
2444 ? _gvn.transform( new RoundDoubleNode(0, n) )
2445 : n;
2446 }
2447
2448 // rounding for non-strict double stores
2449 Node* GraphKit::dstore_rounding(Node* n) {
2450 return Matcher::strict_fp_requires_explicit_rounding
2451 && UseSSE <= 1
2452 ? _gvn.transform( new RoundDoubleNode(0, n) )
2453 : n;
2454 }
2455
2456 //=============================================================================
2457 // Generate a fast path/slow path idiom. Graph looks like:
2458 // [foo] indicates that 'foo' is a parameter
2459 //
2460 // [in] NULL
2461 // \ /
2462 // CmpP
2463 // Bool ne
2464 // If
2465 // / \
2466 // True False-<2>
2467 // / |
2468 // / cast_not_null
2469 // Load | | ^
2470 // [fast_test] | |
2471 // gvn to opt_test | |
2472 // / \ | <1>
2473 // True False |
2474 // | \\ |
2475 // [slow_call] \[fast_result]
2476 // Ctl Val \ \
2477 // | \ \
2478 // Catch <1> \ \
2479 // / \ ^ \ \
2480 // Ex No_Ex | \ \
2481 // | \ \ | \ <2> \
2482 // ... \ [slow_res] | | \ [null_result]
2483 // \ \--+--+--- | |
2484 // \ | / \ | /
2485 // --------Region Phi
2486 //
2487 //=============================================================================
2488 // Code is structured as a series of driver functions all called 'do_XXX' that
2489 // call a set of helper functions. Helper functions first, then drivers.
2490
2491 //------------------------------null_check_oop---------------------------------
2492 // Null check oop. Set null-path control into Region in slot 3.
2493 // Make a cast-not-nullness use the other not-null control. Return cast.
2494 Node* GraphKit::null_check_oop(Node* value, Node* *null_control,
2495 bool never_see_null,
2496 bool safe_for_replace,
2497 bool speculative) {
2498 // Initial NULL check taken path
2499 (*null_control) = top();
2500 Node* cast = null_check_common(value, T_OBJECT, false, null_control, speculative);
2501
2502 // Generate uncommon_trap:
2503 if (never_see_null && (*null_control) != top()) {
2504 // If we see an unexpected null at a check-cast we record it and force a
2505 // recompile; the offending check-cast will be compiled to handle NULLs.
2506 // If we see more than one offending BCI, then all checkcasts in the
2507 // method will be compiled to handle NULLs.
2508 PreserveJVMState pjvms(this);
2509 set_control(*null_control);
2510 replace_in_map(value, null());
2511 Deoptimization::DeoptReason reason = Deoptimization::reason_null_check(speculative);
2512 uncommon_trap(reason,
2513 Deoptimization::Action_make_not_entrant);
2514 (*null_control) = top(); // NULL path is dead
2515 }
2516 if ((*null_control) == top() && safe_for_replace) {
2517 replace_in_map(value, cast);
2518 }
2519
2520 // Cast away null-ness on the result
2521 return cast;
2522 }
2523
2524 //------------------------------opt_iff----------------------------------------
2525 // Optimize the fast-check IfNode. Set the fast-path region slot 2.
2526 // Return slow-path control.
2527 Node* GraphKit::opt_iff(Node* region, Node* iff) {
2528 IfNode *opt_iff = _gvn.transform(iff)->as_If();
2529
2530 // Fast path taken; set region slot 2
2531 Node *fast_taken = _gvn.transform( new IfFalseNode(opt_iff) );
2532 region->init_req(2,fast_taken); // Capture fast-control
2533
2534 // Fast path not-taken, i.e. slow path
2535 Node *slow_taken = _gvn.transform( new IfTrueNode(opt_iff) );
2536 return slow_taken;
2537 }
2538
2539 //-----------------------------make_runtime_call-------------------------------
2540 Node* GraphKit::make_runtime_call(int flags,
2541 const TypeFunc* call_type, address call_addr,
2542 const char* call_name,
2543 const TypePtr* adr_type,
2544 // The following parms are all optional.
2545 // The first NULL ends the list.
2546 Node* parm0, Node* parm1,
2547 Node* parm2, Node* parm3,
2548 Node* parm4, Node* parm5,
2549 Node* parm6, Node* parm7) {
2550 // Slow-path call
2551 bool is_leaf = !(flags & RC_NO_LEAF);
2552 bool has_io = (!is_leaf && !(flags & RC_NO_IO));
2553 if (call_name == NULL) {
2554 assert(!is_leaf, "must supply name for leaf");
2555 call_name = OptoRuntime::stub_name(call_addr);
2556 }
2557 CallNode* call;
2558 if (!is_leaf) {
2559 call = new CallStaticJavaNode(call_type, call_addr, call_name,
2560 bci(), adr_type);
2561 } else if (flags & RC_NO_FP) {
2562 call = new CallLeafNoFPNode(call_type, call_addr, call_name, adr_type);
2563 } else {
2564 call = new CallLeafNode(call_type, call_addr, call_name, adr_type);
2565 }
2566
2567 // The following is similar to set_edges_for_java_call,
2568 // except that the memory effects of the call are restricted to AliasIdxRaw.
2569
2570 // Slow path call has no side-effects, uses few values
2571 bool wide_in = !(flags & RC_NARROW_MEM);
2572 bool wide_out = (C->get_alias_index(adr_type) == Compile::AliasIdxBot);
2573
2574 Node* prev_mem = NULL;
2575 if (wide_in) {
2576 prev_mem = set_predefined_input_for_runtime_call(call);
2577 } else {
2578 assert(!wide_out, "narrow in => narrow out");
2579 Node* narrow_mem = memory(adr_type);
2580 prev_mem = set_predefined_input_for_runtime_call(call, narrow_mem);
2581 }
2582
2583 // Hook each parm in order. Stop looking at the first NULL.
2584 if (parm0 != NULL) { call->init_req(TypeFunc::Parms+0, parm0);
2585 if (parm1 != NULL) { call->init_req(TypeFunc::Parms+1, parm1);
2586 if (parm2 != NULL) { call->init_req(TypeFunc::Parms+2, parm2);
2587 if (parm3 != NULL) { call->init_req(TypeFunc::Parms+3, parm3);
2588 if (parm4 != NULL) { call->init_req(TypeFunc::Parms+4, parm4);
2589 if (parm5 != NULL) { call->init_req(TypeFunc::Parms+5, parm5);
2590 if (parm6 != NULL) { call->init_req(TypeFunc::Parms+6, parm6);
2591 if (parm7 != NULL) { call->init_req(TypeFunc::Parms+7, parm7);
2592 /* close each nested if ===> */ } } } } } } } }
2593 assert(call->in(call->req()-1) != NULL, "must initialize all parms");
2594
2595 if (!is_leaf) {
2596 // Non-leaves can block and take safepoints:
2597 add_safepoint_edges(call, ((flags & RC_MUST_THROW) != 0));
2598 }
2599 // Non-leaves can throw exceptions:
2600 if (has_io) {
2601 call->set_req(TypeFunc::I_O, i_o());
2602 }
2603
2604 if (flags & RC_UNCOMMON) {
2605 // Set the count to a tiny probability. Cf. Estimate_Block_Frequency.
2606 // (An "if" probability corresponds roughly to an unconditional count.
2607 // Sort of.)
2608 call->set_cnt(PROB_UNLIKELY_MAG(4));
2609 }
2610
2611 Node* c = _gvn.transform(call);
2612 assert(c == call, "cannot disappear");
2613
2614 if (wide_out) {
2615 // Slow path call has full side-effects.
2616 set_predefined_output_for_runtime_call(call);
2617 } else {
2618 // Slow path call has few side-effects, and/or sets few values.
2619 set_predefined_output_for_runtime_call(call, prev_mem, adr_type);
2620 }
2621
2622 if (has_io) {
2623 set_i_o(_gvn.transform(new ProjNode(call, TypeFunc::I_O)));
2624 }
2625 return call;
2626
2627 }
2628
2629 //------------------------------merge_memory-----------------------------------
2630 // Merge memory from one path into the current memory state.
2631 void GraphKit::merge_memory(Node* new_mem, Node* region, int new_path) {
2632 for (MergeMemStream mms(merged_memory(), new_mem->as_MergeMem()); mms.next_non_empty2(); ) {
2633 Node* old_slice = mms.force_memory();
2634 Node* new_slice = mms.memory2();
2635 if (old_slice != new_slice) {
2636 PhiNode* phi;
2637 if (old_slice->is_Phi() && old_slice->as_Phi()->region() == region) {
2638 if (mms.is_empty()) {
2639 // clone base memory Phi's inputs for this memory slice
2640 assert(old_slice == mms.base_memory(), "sanity");
2641 phi = PhiNode::make(region, NULL, Type::MEMORY, mms.adr_type(C));
2642 _gvn.set_type(phi, Type::MEMORY);
2643 for (uint i = 1; i < phi->req(); i++) {
2644 phi->init_req(i, old_slice->in(i));
2645 }
2646 } else {
2647 phi = old_slice->as_Phi(); // Phi was generated already
2648 }
2649 } else {
2650 phi = PhiNode::make(region, old_slice, Type::MEMORY, mms.adr_type(C));
2651 _gvn.set_type(phi, Type::MEMORY);
2652 }
2653 phi->set_req(new_path, new_slice);
2654 mms.set_memory(phi);
2655 }
2656 }
2657 }
2658
2659 //------------------------------make_slow_call_ex------------------------------
2660 // Make the exception handler hookups for the slow call
2661 void GraphKit::make_slow_call_ex(Node* call, ciInstanceKlass* ex_klass, bool separate_io_proj, bool deoptimize) {
2662 if (stopped()) return;
2663
2664 // Make a catch node with just two handlers: fall-through and catch-all
2665 Node* i_o = _gvn.transform( new ProjNode(call, TypeFunc::I_O, separate_io_proj) );
2666 Node* catc = _gvn.transform( new CatchNode(control(), i_o, 2) );
2667 Node* norm = _gvn.transform( new CatchProjNode(catc, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci) );
2668 Node* excp = _gvn.transform( new CatchProjNode(catc, CatchProjNode::catch_all_index, CatchProjNode::no_handler_bci) );
2669
2670 { PreserveJVMState pjvms(this);
2671 set_control(excp);
2672 set_i_o(i_o);
2673
2674 if (excp != top()) {
2675 if (deoptimize) {
2676 // Deoptimize if an exception is caught. Don't construct exception state in this case.
2677 uncommon_trap(Deoptimization::Reason_unhandled,
2678 Deoptimization::Action_none);
2679 } else {
2680 // Create an exception state also.
2681 // Use an exact type if the caller has a specific exception.
2682 const Type* ex_type = TypeOopPtr::make_from_klass_unique(ex_klass)->cast_to_ptr_type(TypePtr::NotNull);
2683 Node* ex_oop = new CreateExNode(ex_type, control(), i_o);
2684 add_exception_state(make_exception_state(_gvn.transform(ex_oop)));
2685 }
2686 }
2687 }
2688
2689 // Get the no-exception control from the CatchNode.
2690 set_control(norm);
2691 }
2692
2693 static IfNode* gen_subtype_check_compare(Node* ctrl, Node* in1, Node* in2, BoolTest::mask test, float p, PhaseGVN* gvn, BasicType bt) {
2694 Node* cmp = NULL;
2695 switch(bt) {
2696 case T_INT: cmp = new CmpINode(in1, in2); break;
2697 case T_ADDRESS: cmp = new CmpPNode(in1, in2); break;
2698 default: fatal("unexpected comparison type %s", type2name(bt));
2699 }
2700 gvn->transform(cmp);
2701 Node* bol = gvn->transform(new BoolNode(cmp, test));
2702 IfNode* iff = new IfNode(ctrl, bol, p, COUNT_UNKNOWN);
2703 gvn->transform(iff);
2704 if (!bol->is_Con()) gvn->record_for_igvn(iff);
2705 return iff;
2706 }
2707
2708
2709 //-------------------------------gen_subtype_check-----------------------------
2710 // Generate a subtyping check. Takes as input the subtype and supertype.
2711 // Returns 2 values: sets the default control() to the true path and returns
2712 // the false path. Only reads invariant memory; sets no (visible) memory.
2713 // The PartialSubtypeCheckNode sets the hidden 1-word cache in the encoding
2714 // but that's not exposed to the optimizer. This call also doesn't take in an
2715 // Object; if you wish to check an Object you need to load the Object's class
2716 // prior to coming here.
2717 Node* Phase::gen_subtype_check(Node* subklass, Node* superklass, Node** ctrl, MergeMemNode* mem, PhaseGVN* gvn) {
2718 Compile* C = gvn->C;
2719
2720 if ((*ctrl)->is_top()) {
2721 return C->top();
2722 }
2723
2724 // Fast check for identical types, perhaps identical constants.
2725 // The types can even be identical non-constants, in cases
2726 // involving Array.newInstance, Object.clone, etc.
2727 if (subklass == superklass)
2728 return C->top(); // false path is dead; no test needed.
2729
2730 if (gvn->type(superklass)->singleton()) {
2731 ciKlass* superk = gvn->type(superklass)->is_klassptr()->klass();
2732 ciKlass* subk = gvn->type(subklass)->is_klassptr()->klass();
2733
2734 // In the common case of an exact superklass, try to fold up the
2735 // test before generating code. You may ask, why not just generate
2736 // the code and then let it fold up? The answer is that the generated
2737 // code will necessarily include null checks, which do not always
2738 // completely fold away. If they are also needless, then they turn
2739 // into a performance loss. Example:
2740 // Foo[] fa = blah(); Foo x = fa[0]; fa[1] = x;
2741 // Here, the type of 'fa' is often exact, so the store check
2742 // of fa[1]=x will fold up, without testing the nullness of x.
2743 switch (C->static_subtype_check(superk, subk)) {
2744 case Compile::SSC_always_false:
2745 {
2746 Node* always_fail = *ctrl;
2747 *ctrl = gvn->C->top();
2748 return always_fail;
2749 }
2750 case Compile::SSC_always_true:
2751 return C->top();
2752 case Compile::SSC_easy_test:
2753 {
2754 // Just do a direct pointer compare and be done.
2755 IfNode* iff = gen_subtype_check_compare(*ctrl, subklass, superklass, BoolTest::eq, PROB_STATIC_FREQUENT, gvn, T_ADDRESS);
2756 *ctrl = gvn->transform(new IfTrueNode(iff));
2757 return gvn->transform(new IfFalseNode(iff));
2758 }
2759 case Compile::SSC_full_test:
2760 break;
2761 default:
2762 ShouldNotReachHere();
2763 }
2764 }
2765
2766 // %%% Possible further optimization: Even if the superklass is not exact,
2767 // if the subklass is the unique subtype of the superklass, the check
2768 // will always succeed. We could leave a dependency behind to ensure this.
2769
2770 // First load the super-klass's check-offset
2771 Node *p1 = gvn->transform(new AddPNode(superklass, superklass, gvn->MakeConX(in_bytes(Klass::super_check_offset_offset()))));
2772 Node* m = mem->memory_at(C->get_alias_index(gvn->type(p1)->is_ptr()));
2773 Node *chk_off = gvn->transform(new LoadINode(NULL, m, p1, gvn->type(p1)->is_ptr(), TypeInt::INT, MemNode::unordered));
2774 int cacheoff_con = in_bytes(Klass::secondary_super_cache_offset());
2775 bool might_be_cache = (gvn->find_int_con(chk_off, cacheoff_con) == cacheoff_con);
2776
2777 // Load from the sub-klass's super-class display list, or a 1-word cache of
2778 // the secondary superclass list, or a failing value with a sentinel offset
2779 // if the super-klass is an interface or exceptionally deep in the Java
2780 // hierarchy and we have to scan the secondary superclass list the hard way.
2781 // Worst-case type is a little odd: NULL is allowed as a result (usually
2782 // klass loads can never produce a NULL).
2783 Node *chk_off_X = chk_off;
2784 #ifdef _LP64
2785 chk_off_X = gvn->transform(new ConvI2LNode(chk_off_X));
2786 #endif
2787 Node *p2 = gvn->transform(new AddPNode(subklass,subklass,chk_off_X));
2788 // For some types like interfaces the following loadKlass is from a 1-word
2789 // cache which is mutable so can't use immutable memory. Other
2790 // types load from the super-class display table which is immutable.
2791 m = mem->memory_at(C->get_alias_index(gvn->type(p2)->is_ptr()));
2792 Node *kmem = might_be_cache ? m : C->immutable_memory();
2793 Node *nkls = gvn->transform(LoadKlassNode::make(*gvn, NULL, kmem, p2, gvn->type(p2)->is_ptr(), TypeKlassPtr::OBJECT_OR_NULL));
2794
2795 // Compile speed common case: ARE a subtype and we canNOT fail
2796 if( superklass == nkls )
2797 return C->top(); // false path is dead; no test needed.
2798
2799 // See if we get an immediate positive hit. Happens roughly 83% of the
2800 // time. Test to see if the value loaded just previously from the subklass
2801 // is exactly the superklass.
2802 IfNode *iff1 = gen_subtype_check_compare(*ctrl, superklass, nkls, BoolTest::eq, PROB_LIKELY(0.83f), gvn, T_ADDRESS);
2803 Node *iftrue1 = gvn->transform( new IfTrueNode (iff1));
2804 *ctrl = gvn->transform(new IfFalseNode(iff1));
2805
2806 // Compile speed common case: Check for being deterministic right now. If
2807 // chk_off is a constant and not equal to cacheoff then we are NOT a
2808 // subklass. In this case we need exactly the 1 test above and we can
2809 // return those results immediately.
2810 if (!might_be_cache) {
2811 Node* not_subtype_ctrl = *ctrl;
2812 *ctrl = iftrue1; // We need exactly the 1 test above
2813 return not_subtype_ctrl;
2814 }
2815
2816 // Gather the various success & failures here
2817 RegionNode *r_ok_subtype = new RegionNode(4);
2818 gvn->record_for_igvn(r_ok_subtype);
2819 RegionNode *r_not_subtype = new RegionNode(3);
2820 gvn->record_for_igvn(r_not_subtype);
2821
2822 r_ok_subtype->init_req(1, iftrue1);
2823
2824 // Check for immediate negative hit. Happens roughly 11% of the time (which
2825 // is roughly 63% of the remaining cases). Test to see if the loaded
2826 // check-offset points into the subklass display list or the 1-element
2827 // cache. If it points to the display (and NOT the cache) and the display
2828 // missed then it's not a subtype.
2829 Node *cacheoff = gvn->intcon(cacheoff_con);
2830 IfNode *iff2 = gen_subtype_check_compare(*ctrl, chk_off, cacheoff, BoolTest::ne, PROB_LIKELY(0.63f), gvn, T_INT);
2831 r_not_subtype->init_req(1, gvn->transform(new IfTrueNode (iff2)));
2832 *ctrl = gvn->transform(new IfFalseNode(iff2));
2833
2834 // Check for self. Very rare to get here, but it is taken 1/3 the time.
2835 // No performance impact (too rare) but allows sharing of secondary arrays
2836 // which has some footprint reduction.
2837 IfNode *iff3 = gen_subtype_check_compare(*ctrl, subklass, superklass, BoolTest::eq, PROB_LIKELY(0.36f), gvn, T_ADDRESS);
2838 r_ok_subtype->init_req(2, gvn->transform(new IfTrueNode(iff3)));
2839 *ctrl = gvn->transform(new IfFalseNode(iff3));
2840
2841 // -- Roads not taken here: --
2842 // We could also have chosen to perform the self-check at the beginning
2843 // of this code sequence, as the assembler does. This would not pay off
2844 // the same way, since the optimizer, unlike the assembler, can perform
2845 // static type analysis to fold away many successful self-checks.
2846 // Non-foldable self checks work better here in second position, because
2847 // the initial primary superclass check subsumes a self-check for most
2848 // types. An exception would be a secondary type like array-of-interface,
2849 // which does not appear in its own primary supertype display.
2850 // Finally, we could have chosen to move the self-check into the
2851 // PartialSubtypeCheckNode, and from there out-of-line in a platform
2852 // dependent manner. But it is worthwhile to have the check here,
2853 // where it can be perhaps be optimized. The cost in code space is
2854 // small (register compare, branch).
2855
2856 // Now do a linear scan of the secondary super-klass array. Again, no real
2857 // performance impact (too rare) but it's gotta be done.
2858 // Since the code is rarely used, there is no penalty for moving it
2859 // out of line, and it can only improve I-cache density.
2860 // The decision to inline or out-of-line this final check is platform
2861 // dependent, and is found in the AD file definition of PartialSubtypeCheck.
2862 Node* psc = gvn->transform(
2863 new PartialSubtypeCheckNode(*ctrl, subklass, superklass));
2864
2865 IfNode *iff4 = gen_subtype_check_compare(*ctrl, psc, gvn->zerocon(T_OBJECT), BoolTest::ne, PROB_FAIR, gvn, T_ADDRESS);
2866 r_not_subtype->init_req(2, gvn->transform(new IfTrueNode (iff4)));
2867 r_ok_subtype ->init_req(3, gvn->transform(new IfFalseNode(iff4)));
2868
2869 // Return false path; set default control to true path.
2870 *ctrl = gvn->transform(r_ok_subtype);
2871 return gvn->transform(r_not_subtype);
2872 }
2873
2874 // Profile-driven exact type check:
2875 Node* GraphKit::type_check_receiver(Node* receiver, ciKlass* klass,
2876 float prob,
2877 Node* *casted_receiver) {
2878 const TypeKlassPtr* tklass = TypeKlassPtr::make(klass);
2879 Node* recv_klass = load_object_klass(receiver);
2880 Node* fail = type_check(recv_klass, tklass, prob);
2881 const TypeOopPtr* recv_xtype = tklass->as_instance_type();
2882 assert(recv_xtype->klass_is_exact(), "");
2883
2884 // Subsume downstream occurrences of receiver with a cast to
2885 // recv_xtype, since now we know what the type will be.
2886 Node* cast = new CheckCastPPNode(control(), receiver, recv_xtype);
2887 Node* res = _gvn.transform(cast);
2888 if (recv_xtype->is_valuetypeptr() && recv_xtype->value_klass()->is_scalarizable()) {
2889 assert(!gvn().type(res)->maybe_null(), "receiver should never be null");
2890 res = ValueTypeNode::make_from_oop(this, res, recv_xtype->value_klass());
2891 }
2892
2893 (*casted_receiver) = res;
2894 // (User must make the replace_in_map call.)
2895
2896 return fail;
2897 }
2898
2899 Node* GraphKit::type_check(Node* recv_klass, const TypeKlassPtr* tklass,
2900 float prob) {
2901 Node* want_klass = makecon(tklass);
2902 Node* cmp = _gvn.transform( new CmpPNode(recv_klass, want_klass));
2903 Node* bol = _gvn.transform( new BoolNode(cmp, BoolTest::eq) );
2904 IfNode* iff = create_and_xform_if(control(), bol, prob, COUNT_UNKNOWN);
2905 set_control( _gvn.transform( new IfTrueNode (iff)));
2906 Node* fail = _gvn.transform( new IfFalseNode(iff));
2907 return fail;
2908 }
2909
2910 //------------------------------subtype_check_receiver-------------------------
2911 Node* GraphKit::subtype_check_receiver(Node* receiver, ciKlass* klass,
2912 Node** casted_receiver) {
2913 const TypeKlassPtr* tklass = TypeKlassPtr::make(klass);
2914 Node* recv_klass = load_object_klass(receiver);
2915 Node* want_klass = makecon(tklass);
2916
2917 Node* slow_ctl = gen_subtype_check(recv_klass, want_klass);
2918
2919 // Cast receiver after successful check
2920 const TypeOopPtr* recv_type = tklass->cast_to_exactness(false)->is_klassptr()->as_instance_type();
2921 Node* cast = new CheckCastPPNode(control(), receiver, recv_type);
2922 (*casted_receiver) = _gvn.transform(cast);
2923
2924 return slow_ctl;
2925 }
2926
2927 //------------------------------seems_never_null-------------------------------
2928 // Use null_seen information if it is available from the profile.
2929 // If we see an unexpected null at a type check we record it and force a
2930 // recompile; the offending check will be recompiled to handle NULLs.
2931 // If we see several offending BCIs, then all checks in the
2932 // method will be recompiled.
2933 bool GraphKit::seems_never_null(Node* obj, ciProfileData* data, bool& speculating) {
2934 speculating = !_gvn.type(obj)->speculative_maybe_null();
2935 Deoptimization::DeoptReason reason = Deoptimization::reason_null_check(speculating);
2936 if (UncommonNullCast // Cutout for this technique
2937 && obj != null() // And not the -Xcomp stupid case?
2938 && !too_many_traps(reason)
2939 ) {
2940 if (speculating) {
2941 return true;
2942 }
2943 if (data == NULL)
2944 // Edge case: no mature data. Be optimistic here.
2945 return true;
2946 // If the profile has not seen a null, assume it won't happen.
2947 assert(java_bc() == Bytecodes::_checkcast ||
2948 java_bc() == Bytecodes::_instanceof ||
2949 java_bc() == Bytecodes::_aastore, "MDO must collect null_seen bit here");
2950 return !data->as_BitData()->null_seen();
2951 }
2952 speculating = false;
2953 return false;
2954 }
2955
2956 //------------------------maybe_cast_profiled_receiver-------------------------
2957 // If the profile has seen exactly one type, narrow to exactly that type.
2958 // Subsequent type checks will always fold up.
2959 Node* GraphKit::maybe_cast_profiled_receiver(Node* not_null_obj,
2960 ciKlass* require_klass,
2961 ciKlass* spec_klass,
2962 bool safe_for_replace) {
2963 if (!UseTypeProfile || !TypeProfileCasts) return NULL;
2964
2965 Deoptimization::DeoptReason reason = Deoptimization::reason_class_check(spec_klass != NULL);
2966
2967 // Make sure we haven't already deoptimized from this tactic.
2968 if (too_many_traps_or_recompiles(reason))
2969 return NULL;
2970
2971 // (No, this isn't a call, but it's enough like a virtual call
2972 // to use the same ciMethod accessor to get the profile info...)
2973 // If we have a speculative type use it instead of profiling (which
2974 // may not help us)
2975 ciKlass* exact_kls = spec_klass == NULL ? profile_has_unique_klass() : spec_klass;
2976 if (exact_kls != NULL) {// no cast failures here
2977 if (require_klass == NULL ||
2978 C->static_subtype_check(require_klass, exact_kls) == Compile::SSC_always_true) {
2979 // If we narrow the type to match what the type profile sees or
2980 // the speculative type, we can then remove the rest of the
2981 // cast.
2982 // This is a win, even if the exact_kls is very specific,
2983 // because downstream operations, such as method calls,
2984 // will often benefit from the sharper type.
2985 Node* exact_obj = not_null_obj; // will get updated in place...
2986 Node* slow_ctl = type_check_receiver(exact_obj, exact_kls, 1.0,
2987 &exact_obj);
2988 { PreserveJVMState pjvms(this);
2989 set_control(slow_ctl);
2990 uncommon_trap_exact(reason, Deoptimization::Action_maybe_recompile);
2991 }
2992 if (safe_for_replace) {
2993 replace_in_map(not_null_obj, exact_obj);
2994 }
2995 return exact_obj;
2996 }
2997 // assert(ssc == Compile::SSC_always_true)... except maybe the profile lied to us.
2998 }
2999
3000 return NULL;
3001 }
3002
3003 /**
3004 * Cast obj to type and emit guard unless we had too many traps here
3005 * already
3006 *
3007 * @param obj node being casted
3008 * @param type type to cast the node to
3009 * @param not_null true if we know node cannot be null
3010 */
3011 Node* GraphKit::maybe_cast_profiled_obj(Node* obj,
3012 ciKlass* type,
3013 bool not_null) {
3014 if (stopped()) {
3015 return obj;
3016 }
3017
3018 // type == NULL if profiling tells us this object is always null
3019 if (type != NULL) {
3020 Deoptimization::DeoptReason class_reason = Deoptimization::Reason_speculate_class_check;
3021 Deoptimization::DeoptReason null_reason = Deoptimization::Reason_speculate_null_check;
3022
3023 if (!too_many_traps_or_recompiles(null_reason) &&
3024 !too_many_traps_or_recompiles(class_reason)) {
3025 Node* not_null_obj = NULL;
3026 // not_null is true if we know the object is not null and
3027 // there's no need for a null check
3028 if (!not_null) {
3029 Node* null_ctl = top();
3030 not_null_obj = null_check_oop(obj, &null_ctl, true, true, true);
3031 assert(null_ctl->is_top(), "no null control here");
3032 } else {
3033 not_null_obj = obj;
3034 }
3035
3036 Node* exact_obj = not_null_obj;
3037 ciKlass* exact_kls = type;
3038 Node* slow_ctl = type_check_receiver(exact_obj, exact_kls, 1.0,
3039 &exact_obj);
3040 {
3041 PreserveJVMState pjvms(this);
3042 set_control(slow_ctl);
3043 uncommon_trap_exact(class_reason, Deoptimization::Action_maybe_recompile);
3044 }
3045 replace_in_map(not_null_obj, exact_obj);
3046 obj = exact_obj;
3047 }
3048 } else {
3049 if (!too_many_traps_or_recompiles(Deoptimization::Reason_null_assert)) {
3050 Node* exact_obj = null_assert(obj);
3051 replace_in_map(obj, exact_obj);
3052 obj = exact_obj;
3053 }
3054 }
3055 return obj;
3056 }
3057
3058 //-------------------------------gen_instanceof--------------------------------
3059 // Generate an instance-of idiom. Used by both the instance-of bytecode
3060 // and the reflective instance-of call.
3061 Node* GraphKit::gen_instanceof(Node* obj, Node* superklass, bool safe_for_replace) {
3062 kill_dead_locals(); // Benefit all the uncommon traps
3063 assert( !stopped(), "dead parse path should be checked in callers" );
3064 assert(!TypePtr::NULL_PTR->higher_equal(_gvn.type(superklass)->is_klassptr()),
3065 "must check for not-null not-dead klass in callers");
3066
3067 // Make the merge point
3068 enum { _obj_path = 1, _fail_path, _null_path, PATH_LIMIT };
3069 RegionNode* region = new RegionNode(PATH_LIMIT);
3070 Node* phi = new PhiNode(region, TypeInt::BOOL);
3071 C->set_has_split_ifs(true); // Has chance for split-if optimization
3072
3073 ciProfileData* data = NULL;
3074 if (java_bc() == Bytecodes::_instanceof) { // Only for the bytecode
3075 data = method()->method_data()->bci_to_data(bci());
3076 }
3077 bool speculative_not_null = false;
3078 bool never_see_null = (ProfileDynamicTypes // aggressive use of profile
3079 && seems_never_null(obj, data, speculative_not_null));
3080 bool is_value = obj->is_ValueType();
3081
3082 // Null check; get casted pointer; set region slot 3
3083 Node* null_ctl = top();
3084 Node* not_null_obj = is_value ? obj : null_check_oop(obj, &null_ctl, never_see_null, safe_for_replace, speculative_not_null);
3085
3086 // If not_null_obj is dead, only null-path is taken
3087 if (stopped()) { // Doing instance-of on a NULL?
3088 set_control(null_ctl);
3089 return intcon(0);
3090 }
3091 region->init_req(_null_path, null_ctl);
3092 phi ->init_req(_null_path, intcon(0)); // Set null path value
3093 if (null_ctl == top()) {
3094 // Do this eagerly, so that pattern matches like is_diamond_phi
3095 // will work even during parsing.
3096 assert(_null_path == PATH_LIMIT-1, "delete last");
3097 region->del_req(_null_path);
3098 phi ->del_req(_null_path);
3099 }
3100
3101 // Do we know the type check always succeed?
3102 if (!is_value) {
3103 bool known_statically = false;
3104 if (_gvn.type(superklass)->singleton()) {
3105 ciKlass* superk = _gvn.type(superklass)->is_klassptr()->klass();
3106 ciKlass* subk = _gvn.type(obj)->is_oopptr()->klass();
3107 if (subk != NULL && subk->is_loaded()) {
3108 int static_res = C->static_subtype_check(superk, subk);
3109 known_statically = (static_res == Compile::SSC_always_true || static_res == Compile::SSC_always_false);
3110 }
3111 }
3112
3113 if (!known_statically) {
3114 const TypeOopPtr* obj_type = _gvn.type(obj)->is_oopptr();
3115 // We may not have profiling here or it may not help us. If we
3116 // have a speculative type use it to perform an exact cast.
3117 ciKlass* spec_obj_type = obj_type->speculative_type();
3118 if (spec_obj_type != NULL || (ProfileDynamicTypes && data != NULL)) {
3119 Node* cast_obj = maybe_cast_profiled_receiver(not_null_obj, NULL, spec_obj_type, safe_for_replace);
3120 if (stopped()) { // Profile disagrees with this path.
3121 set_control(null_ctl); // Null is the only remaining possibility.
3122 return intcon(0);
3123 }
3124 if (cast_obj != NULL &&
3125 // A value that's sometimes null is not something we can optimize well
3126 !(cast_obj->is_ValueType() && null_ctl != top())) {
3127 not_null_obj = cast_obj;
3128 is_value = not_null_obj->is_ValueType();
3129 }
3130 }
3131 }
3132 }
3133
3134 // Load the object's klass
3135 Node* obj_klass = NULL;
3136 if (is_value) {
3137 obj_klass = makecon(TypeKlassPtr::make(_gvn.type(not_null_obj)->is_valuetype()->value_klass()));
3138 } else {
3139 obj_klass = load_object_klass(not_null_obj);
3140 }
3141
3142 // Generate the subtype check
3143 Node* not_subtype_ctrl = gen_subtype_check(obj_klass, superklass);
3144
3145 // Plug in the success path to the general merge in slot 1.
3146 region->init_req(_obj_path, control());
3147 phi ->init_req(_obj_path, intcon(1));
3148
3149 // Plug in the failing path to the general merge in slot 2.
3150 region->init_req(_fail_path, not_subtype_ctrl);
3151 phi ->init_req(_fail_path, intcon(0));
3152
3153 // Return final merged results
3154 set_control( _gvn.transform(region) );
3155 record_for_igvn(region);
3156
3157 // If we know the type check always succeeds then we don't use the
3158 // profiling data at this bytecode. Don't lose it, feed it to the
3159 // type system as a speculative type.
3160 if (safe_for_replace && !is_value) {
3161 Node* casted_obj = record_profiled_receiver_for_speculation(obj);
3162 replace_in_map(obj, casted_obj);
3163 }
3164
3165 return _gvn.transform(phi);
3166 }
3167
3168 //-------------------------------gen_checkcast---------------------------------
3169 // Generate a checkcast idiom. Used by both the checkcast bytecode and the
3170 // array store bytecode. Stack must be as-if BEFORE doing the bytecode so the
3171 // uncommon-trap paths work. Adjust stack after this call.
3172 // If failure_control is supplied and not null, it is filled in with
3173 // the control edge for the cast failure. Otherwise, an appropriate
3174 // uncommon trap or exception is thrown.
3175 Node* GraphKit::gen_checkcast(Node *obj, Node* superklass, Node* *failure_control, bool never_null) {
3176 kill_dead_locals(); // Benefit all the uncommon traps
3177 const TypeKlassPtr* tk = _gvn.type(superklass)->is_klassptr();
3178 const TypeOopPtr* toop = TypeOopPtr::make_from_klass(tk->klass());
3179 assert(!never_null || toop->is_valuetypeptr(), "must be a value type pointer");
3180 bool is_value = obj->is_ValueType();
3181
3182 // Fast cutout: Check the case that the cast is vacuously true.
3183 // This detects the common cases where the test will short-circuit
3184 // away completely. We do this before we perform the null check,
3185 // because if the test is going to turn into zero code, we don't
3186 // want a residual null check left around. (Causes a slowdown,
3187 // for example, in some objArray manipulations, such as a[i]=a[j].)
3188 if (tk->singleton()) {
3189 ciKlass* klass = NULL;
3190 if (is_value) {
3191 klass = _gvn.type(obj)->is_valuetype()->value_klass();
3192 } else {
3193 const TypeOopPtr* objtp = _gvn.type(obj)->isa_oopptr();
3194 if (objtp != NULL) {
3195 klass = objtp->klass();
3196 }
3197 }
3198 if (klass != NULL) {
3199 switch (C->static_subtype_check(tk->klass(), klass)) {
3200 case Compile::SSC_always_true:
3201 // If we know the type check always succeed then we don't use
3202 // the profiling data at this bytecode. Don't lose it, feed it
3203 // to the type system as a speculative type.
3204 if (!is_value) {
3205 obj = record_profiled_receiver_for_speculation(obj);
3206 if (never_null) {
3207 obj = null_check(obj);
3208 }
3209 if (toop->is_valuetypeptr() && toop->value_klass()->is_scalarizable() && !gvn().type(obj)->maybe_null()) {
3210 obj = ValueTypeNode::make_from_oop(this, obj, toop->value_klass());
3211 }
3212 }
3213 return obj;
3214 case Compile::SSC_always_false:
3215 if (is_value || never_null) {
3216 if (!is_value) {
3217 null_check(obj);
3218 }
3219 // Value type is never null. Always throw an exception.
3220 builtin_throw(Deoptimization::Reason_class_check, makecon(TypeKlassPtr::make(klass)));
3221 return top();
3222 } else {
3223 // It needs a null check because a null will *pass* the cast check.
3224 return null_assert(obj);
3225 }
3226 }
3227 }
3228 }
3229
3230 ciProfileData* data = NULL;
3231 bool safe_for_replace = false;
3232 if (failure_control == NULL) { // use MDO in regular case only
3233 assert(java_bc() == Bytecodes::_aastore ||
3234 java_bc() == Bytecodes::_checkcast,
3235 "interpreter profiles type checks only for these BCs");
3236 data = method()->method_data()->bci_to_data(bci());
3237 safe_for_replace = true;
3238 }
3239
3240 // Make the merge point
3241 enum { _obj_path = 1, _null_path, PATH_LIMIT };
3242 RegionNode* region = new RegionNode(PATH_LIMIT);
3243 Node* phi = new PhiNode(region, toop);
3244 C->set_has_split_ifs(true); // Has chance for split-if optimization
3245
3246 // Use null-cast information if it is available
3247 bool speculative_not_null = false;
3248 bool never_see_null = ((failure_control == NULL) // regular case only
3249 && seems_never_null(obj, data, speculative_not_null));
3250
3251 // Null check; get casted pointer; set region slot 3
3252 Node* null_ctl = top();
3253 Node* not_null_obj = NULL;
3254 if (is_value) {
3255 not_null_obj = obj;
3256 } else if (never_null) {
3257 not_null_obj = null_check(obj);
3258 } else {
3259 not_null_obj = null_check_oop(obj, &null_ctl, never_see_null, safe_for_replace, speculative_not_null);
3260 }
3261
3262 // If not_null_obj is dead, only null-path is taken
3263 if (stopped()) { // Doing instance-of on a NULL?
3264 set_control(null_ctl);
3265 return null();
3266 }
3267 region->init_req(_null_path, null_ctl);
3268 phi ->init_req(_null_path, null()); // Set null path value
3269 if (null_ctl == top()) {
3270 // Do this eagerly, so that pattern matches like is_diamond_phi
3271 // will work even during parsing.
3272 assert(_null_path == PATH_LIMIT-1, "delete last");
3273 region->del_req(_null_path);
3274 phi ->del_req(_null_path);
3275 }
3276
3277 Node* cast_obj = NULL;
3278 if (!is_value && tk->klass_is_exact()) {
3279 // The following optimization tries to statically cast the speculative type of the object
3280 // (for example obtained during profiling) to the type of the superklass and then do a
3281 // dynamic check that the type of the object is what we expect. To work correctly
3282 // for checkcast and aastore the type of superklass should be exact.
3283 const TypeOopPtr* obj_type = _gvn.type(obj)->is_oopptr();
3284 // We may not have profiling here or it may not help us. If we have
3285 // a speculative type use it to perform an exact cast.
3286 ciKlass* spec_obj_type = obj_type->speculative_type();
3287 if (spec_obj_type != NULL || data != NULL) {
3288 cast_obj = maybe_cast_profiled_receiver(not_null_obj, tk->klass(), spec_obj_type, safe_for_replace);
3289 if (cast_obj != NULL && cast_obj->is_ValueType()) {
3290 if (null_ctl != top()) {
3291 cast_obj = NULL; // A value that's sometimes null is not something we can optimize well
3292 } else {
3293 return cast_obj;
3294 }
3295 }
3296 if (cast_obj != NULL) {
3297 if (failure_control != NULL) // failure is now impossible
3298 (*failure_control) = top();
3299 // adjust the type of the phi to the exact klass:
3300 phi->raise_bottom_type(_gvn.type(cast_obj)->meet_speculative(TypePtr::NULL_PTR));
3301 }
3302 }
3303 }
3304
3305 if (cast_obj == NULL) {
3306 // Load the object's klass
3307 Node* obj_klass = NULL;
3308 if (is_value) {
3309 obj_klass = makecon(TypeKlassPtr::make(_gvn.type(not_null_obj)->is_valuetype()->value_klass()));
3310 } else {
3311 obj_klass = load_object_klass(not_null_obj);
3312 }
3313
3314 // Generate the subtype check
3315 Node* not_subtype_ctrl = gen_subtype_check( obj_klass, superklass );
3316
3317 // Plug in success path into the merge
3318 cast_obj = is_value ? not_null_obj : _gvn.transform(new CheckCastPPNode(control(), not_null_obj, toop));
3319 // Failure path ends in uncommon trap (or may be dead - failure impossible)
3320 if (failure_control == NULL) {
3321 if (not_subtype_ctrl != top()) { // If failure is possible
3322 PreserveJVMState pjvms(this);
3323 set_control(not_subtype_ctrl);
3324 builtin_throw(Deoptimization::Reason_class_check, obj_klass);
3325 }
3326 } else {
3327 (*failure_control) = not_subtype_ctrl;
3328 }
3329 }
3330
3331 region->init_req(_obj_path, control());
3332 phi ->init_req(_obj_path, cast_obj);
3333
3334 // A merge of NULL or Casted-NotNull obj
3335 Node* res = _gvn.transform(phi);
3336
3337 // Note I do NOT always 'replace_in_map(obj,result)' here.
3338 // if( tk->klass()->can_be_primary_super() )
3339 // This means that if I successfully store an Object into an array-of-String
3340 // I 'forget' that the Object is really now known to be a String. I have to
3341 // do this because we don't have true union types for interfaces - if I store
3342 // a Baz into an array-of-Interface and then tell the optimizer it's an
3343 // Interface, I forget that it's also a Baz and cannot do Baz-like field
3344 // references to it. FIX THIS WHEN UNION TYPES APPEAR!
3345 // replace_in_map( obj, res );
3346
3347 // Return final merged results
3348 set_control( _gvn.transform(region) );
3349 record_for_igvn(region);
3350
3351 if (!is_value) {
3352 res = record_profiled_receiver_for_speculation(res);
3353 if (toop->is_valuetypeptr() && toop->value_klass()->is_scalarizable() && !gvn().type(res)->maybe_null()) {
3354 res = ValueTypeNode::make_from_oop(this, res, toop->value_klass());
3355 }
3356 }
3357 return res;
3358 }
3359
3360 Node* GraphKit::is_always_locked(Node* obj) {
3361 Node* mark_addr = basic_plus_adr(obj, oopDesc::mark_offset_in_bytes());
3362 Node* mark = make_load(NULL, mark_addr, TypeX_X, TypeX_X->basic_type(), MemNode::unordered);
3363 Node* value_mask = _gvn.MakeConX(markOopDesc::always_locked_pattern);
3364 return _gvn.transform(new AndXNode(mark, value_mask));
3365 }
3366
3367 Node* GraphKit::gen_value_type_test(Node* kls) {
3368 Node* flags_addr = basic_plus_adr(kls, in_bytes(Klass::access_flags_offset()));
3369 Node* flags = make_load(NULL, flags_addr, TypeInt::INT, T_INT, MemNode::unordered);
3370 Node* is_value = _gvn.transform(new AndINode(flags, intcon(JVM_ACC_VALUE)));
3371 Node* cmp = _gvn.transform(new CmpINode(is_value, intcon(0)));
3372 return cmp;
3373 }
3374
3375 // Deoptimize if 'obj' is a value type
3376 void GraphKit::gen_value_type_guard(Node* obj, int nargs) {
3377 assert(EnableValhalla, "should only be used if value types are enabled");
3378 Node* bol = NULL;
3379 if (obj->is_ValueTypeBase()) {
3380 bol = intcon(0);
3381 } else {
3382 Node* is_value = is_always_locked(obj);
3383 Node* value_mask = _gvn.MakeConX(markOopDesc::always_locked_pattern);
3384 Node* cmp = _gvn.transform(new CmpXNode(is_value, value_mask));
3385 bol = _gvn.transform(new BoolNode(cmp, BoolTest::ne));
3386 }
3387 { BuildCutout unless(this, bol, PROB_MAX);
3388 inc_sp(nargs);
3389 uncommon_trap(Deoptimization::Reason_class_check,
3390 Deoptimization::Action_none);
3391 }
3392 }
3393
3394 // Deoptimize if 'ary' is flattened or if 'obj' is null and 'ary' is a value type array
3395 void GraphKit::gen_value_type_array_guard(Node* ary, Node* obj, int nargs) {
3396 assert(EnableValhalla, "should only be used if value types are enabled");
3397 // Load array element klass
3398 Node* kls = load_object_klass(ary);
3399 Node* k_adr = basic_plus_adr(kls, in_bytes(ArrayKlass::element_klass_offset()));
3400 Node* elem_klass = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), k_adr, TypeInstPtr::KLASS));
3401 // Check if element is a value type
3402 Node* flags_addr = basic_plus_adr(elem_klass, in_bytes(Klass::access_flags_offset()));
3403 Node* flags = make_load(NULL, flags_addr, TypeInt::INT, T_INT, MemNode::unordered);
3404 Node* is_value_elem = _gvn.transform(new AndINode(flags, intcon(JVM_ACC_VALUE)));
3405
3406 const Type* objtype = _gvn.type(obj);
3407 if (objtype == TypePtr::NULL_PTR) {
3408 // Object is always null, check if array is a value type array
3409 Node* cmp = _gvn.transform(new CmpINode(is_value_elem, intcon(0)));
3410 Node* bol = _gvn.transform(new BoolNode(cmp, BoolTest::eq));
3411 { BuildCutout unless(this, bol, PROB_MAX);
3412 // TODO just deoptimize for now if we store null to a value type array
3413 inc_sp(nargs);
3414 uncommon_trap(Deoptimization::Reason_array_check,
3415 Deoptimization::Action_none);
3416 }
3417 } else {
3418 // Check if (is_value_elem && obj_is_null) <=> (!is_value_elem | !obj_is_null == 0)
3419 // TODO what if we later figure out that obj is never null?
3420 Node* not_value = _gvn.transform(new XorINode(is_value_elem, intcon(JVM_ACC_VALUE)));
3421 not_value = _gvn.transform(new ConvI2LNode(not_value));
3422 Node* not_null = _gvn.transform(new CastP2XNode(NULL, obj));
3423 Node* both = _gvn.transform(new OrLNode(not_null, not_value));
3424 Node* cmp = _gvn.transform(new CmpLNode(both, longcon(0)));
3425 Node* bol = _gvn.transform(new BoolNode(cmp, BoolTest::ne));
3426 { BuildCutout unless(this, bol, PROB_MAX);
3427 // TODO just deoptimize for now if we store null to a value type array
3428 inc_sp(nargs);
3429 uncommon_trap(Deoptimization::Reason_array_check,
3430 Deoptimization::Action_none);
3431 }
3432 }
3433 }
3434
3435 Node* GraphKit::load_lh_array_tag(Node* kls) {
3436 Node* lhp = basic_plus_adr(kls, in_bytes(Klass::layout_helper_offset()));
3437 Node* layout_val = make_load(NULL, lhp, TypeInt::INT, T_INT, MemNode::unordered);
3438 return _gvn.transform(new RShiftINode(layout_val, intcon(Klass::_lh_array_tag_shift)));
3439 }
3440
3441
3442 Node* GraphKit::gen_lh_array_test(Node* kls, unsigned int lh_value) {
3443 Node* layout_val = load_lh_array_tag(kls);
3444 Node* cmp = _gvn.transform(new CmpINode(layout_val, intcon(lh_value)));
3445 return cmp;
3446 }
3447
3448
3449 //------------------------------next_monitor-----------------------------------
3450 // What number should be given to the next monitor?
3451 int GraphKit::next_monitor() {
3452 int current = jvms()->monitor_depth()* C->sync_stack_slots();
3453 int next = current + C->sync_stack_slots();
3454 // Keep the toplevel high water mark current:
3455 if (C->fixed_slots() < next) C->set_fixed_slots(next);
3456 return current;
3457 }
3458
3459 //------------------------------insert_mem_bar---------------------------------
3460 // Memory barrier to avoid floating things around
3461 // The membar serves as a pinch point between both control and all memory slices.
3462 Node* GraphKit::insert_mem_bar(int opcode, Node* precedent) {
3463 MemBarNode* mb = MemBarNode::make(C, opcode, Compile::AliasIdxBot, precedent);
3464 mb->init_req(TypeFunc::Control, control());
3465 mb->init_req(TypeFunc::Memory, reset_memory());
3466 Node* membar = _gvn.transform(mb);
3467 set_control(_gvn.transform(new ProjNode(membar, TypeFunc::Control)));
3468 set_all_memory_call(membar);
3469 return membar;
3470 }
3471
3472 //-------------------------insert_mem_bar_volatile----------------------------
3473 // Memory barrier to avoid floating things around
3474 // The membar serves as a pinch point between both control and memory(alias_idx).
3475 // If you want to make a pinch point on all memory slices, do not use this
3476 // function (even with AliasIdxBot); use insert_mem_bar() instead.
3477 Node* GraphKit::insert_mem_bar_volatile(int opcode, int alias_idx, Node* precedent) {
3478 // When Parse::do_put_xxx updates a volatile field, it appends a series
3479 // of MemBarVolatile nodes, one for *each* volatile field alias category.
3480 // The first membar is on the same memory slice as the field store opcode.
3481 // This forces the membar to follow the store. (Bug 6500685 broke this.)
3482 // All the other membars (for other volatile slices, including AliasIdxBot,
3483 // which stands for all unknown volatile slices) are control-dependent
3484 // on the first membar. This prevents later volatile loads or stores
3485 // from sliding up past the just-emitted store.
3486
3487 MemBarNode* mb = MemBarNode::make(C, opcode, alias_idx, precedent);
3488 mb->set_req(TypeFunc::Control,control());
3489 if (alias_idx == Compile::AliasIdxBot) {
3490 mb->set_req(TypeFunc::Memory, merged_memory()->base_memory());
3491 } else {
3492 assert(!(opcode == Op_Initialize && alias_idx != Compile::AliasIdxRaw), "fix caller");
3493 mb->set_req(TypeFunc::Memory, memory(alias_idx));
3494 }
3495 Node* membar = _gvn.transform(mb);
3496 set_control(_gvn.transform(new ProjNode(membar, TypeFunc::Control)));
3497 if (alias_idx == Compile::AliasIdxBot) {
3498 merged_memory()->set_base_memory(_gvn.transform(new ProjNode(membar, TypeFunc::Memory)));
3499 } else {
3500 set_memory(_gvn.transform(new ProjNode(membar, TypeFunc::Memory)),alias_idx);
3501 }
3502 return membar;
3503 }
3504
3505 //------------------------------shared_lock------------------------------------
3506 // Emit locking code.
3507 FastLockNode* GraphKit::shared_lock(Node* obj) {
3508 // bci is either a monitorenter bc or InvocationEntryBci
3509 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces
3510 assert(SynchronizationEntryBCI == InvocationEntryBci, "");
3511
3512 if( !GenerateSynchronizationCode )
3513 return NULL; // Not locking things?
3514
3515 // We cannot lock on a value type
3516 const TypeOopPtr* objptr = _gvn.type(obj)->make_oopptr();
3517 if (objptr->can_be_value_type()) {
3518 gen_value_type_guard(obj, 1);
3519 }
3520
3521 if (stopped()) // Dead monitor?
3522 return NULL;
3523
3524 assert(dead_locals_are_killed(), "should kill locals before sync. point");
3525
3526 obj = access_resolve(obj, ACCESS_READ | ACCESS_WRITE);
3527
3528 // Box the stack location
3529 Node* box = _gvn.transform(new BoxLockNode(next_monitor()));
3530 Node* mem = reset_memory();
3531
3532 FastLockNode * flock = _gvn.transform(new FastLockNode(0, obj, box) )->as_FastLock();
3533 if (UseBiasedLocking && PrintPreciseBiasedLockingStatistics) {
3534 // Create the counters for this fast lock.
3535 flock->create_lock_counter(sync_jvms()); // sync_jvms used to get current bci
3536 }
3537
3538 // Create the rtm counters for this fast lock if needed.
3539 flock->create_rtm_lock_counter(sync_jvms()); // sync_jvms used to get current bci
3540
3541 // Add monitor to debug info for the slow path. If we block inside the
3542 // slow path and de-opt, we need the monitor hanging around
3543 map()->push_monitor( flock );
3544
3545 const TypeFunc *tf = LockNode::lock_type();
3546 LockNode *lock = new LockNode(C, tf);
3547
3548 lock->init_req( TypeFunc::Control, control() );
3549 lock->init_req( TypeFunc::Memory , mem );
3550 lock->init_req( TypeFunc::I_O , top() ) ; // does no i/o
3551 lock->init_req( TypeFunc::FramePtr, frameptr() );
3552 lock->init_req( TypeFunc::ReturnAdr, top() );
3553
3554 lock->init_req(TypeFunc::Parms + 0, obj);
3555 lock->init_req(TypeFunc::Parms + 1, box);
3556 lock->init_req(TypeFunc::Parms + 2, flock);
3557 add_safepoint_edges(lock);
3558
3559 lock = _gvn.transform( lock )->as_Lock();
3560
3561 // lock has no side-effects, sets few values
3562 set_predefined_output_for_runtime_call(lock, mem, TypeRawPtr::BOTTOM);
3563
3564 insert_mem_bar(Op_MemBarAcquireLock);
3565
3566 // Add this to the worklist so that the lock can be eliminated
3567 record_for_igvn(lock);
3568
3569 #ifndef PRODUCT
3570 if (PrintLockStatistics) {
3571 // Update the counter for this lock. Don't bother using an atomic
3572 // operation since we don't require absolute accuracy.
3573 lock->create_lock_counter(map()->jvms());
3574 increment_counter(lock->counter()->addr());
3575 }
3576 #endif
3577
3578 return flock;
3579 }
3580
3581
3582 //------------------------------shared_unlock----------------------------------
3583 // Emit unlocking code.
3584 void GraphKit::shared_unlock(Node* box, Node* obj) {
3585 // bci is either a monitorenter bc or InvocationEntryBci
3586 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces
3587 assert(SynchronizationEntryBCI == InvocationEntryBci, "");
3588
3589 if( !GenerateSynchronizationCode )
3590 return;
3591 if (stopped()) { // Dead monitor?
3592 map()->pop_monitor(); // Kill monitor from debug info
3593 return;
3594 }
3595 assert(!obj->is_ValueTypeBase(), "should not unlock on value type");
3596
3597 // Memory barrier to avoid floating things down past the locked region
3598 insert_mem_bar(Op_MemBarReleaseLock);
3599
3600 const TypeFunc *tf = OptoRuntime::complete_monitor_exit_Type();
3601 UnlockNode *unlock = new UnlockNode(C, tf);
3602 #ifdef ASSERT
3603 unlock->set_dbg_jvms(sync_jvms());
3604 #endif
3605 uint raw_idx = Compile::AliasIdxRaw;
3606 unlock->init_req( TypeFunc::Control, control() );
3607 unlock->init_req( TypeFunc::Memory , memory(raw_idx) );
3608 unlock->init_req( TypeFunc::I_O , top() ) ; // does no i/o
3609 unlock->init_req( TypeFunc::FramePtr, frameptr() );
3610 unlock->init_req( TypeFunc::ReturnAdr, top() );
3611
3612 unlock->init_req(TypeFunc::Parms + 0, obj);
3613 unlock->init_req(TypeFunc::Parms + 1, box);
3614 unlock = _gvn.transform(unlock)->as_Unlock();
3615
3616 Node* mem = reset_memory();
3617
3618 // unlock has no side-effects, sets few values
3619 set_predefined_output_for_runtime_call(unlock, mem, TypeRawPtr::BOTTOM);
3620
3621 // Kill monitor from debug info
3622 map()->pop_monitor( );
3623 }
3624
3625 //-------------------------------get_layout_helper-----------------------------
3626 // If the given klass is a constant or known to be an array,
3627 // fetch the constant layout helper value into constant_value
3628 // and return (Node*)NULL. Otherwise, load the non-constant
3629 // layout helper value, and return the node which represents it.
3630 // This two-faced routine is useful because allocation sites
3631 // almost always feature constant types.
3632 Node* GraphKit::get_layout_helper(Node* klass_node, jint& constant_value) {
3633 const TypeKlassPtr* inst_klass = _gvn.type(klass_node)->isa_klassptr();
3634 if (!StressReflectiveCode && inst_klass != NULL) {
3635 ciKlass* klass = inst_klass->klass();
3636 assert(klass != NULL, "klass should not be NULL");
3637 bool xklass = inst_klass->klass_is_exact();
3638 bool can_be_value_array = false;
3639 if (klass->is_array_klass() && EnableValhalla && ValueArrayFlatten) {
3640 ciKlass* elem = klass->as_array_klass()->element_klass();
3641 can_be_value_array = elem != NULL && (elem->is_java_lang_Object() || elem->is_interface());
3642 }
3643 if (xklass || (klass->is_array_klass() && !can_be_value_array)) {
3644 jint lhelper = klass->layout_helper();
3645 if (lhelper != Klass::_lh_neutral_value) {
3646 constant_value = lhelper;
3647 return (Node*) NULL;
3648 }
3649 }
3650 }
3651 constant_value = Klass::_lh_neutral_value; // put in a known value
3652 Node* lhp = basic_plus_adr(klass_node, klass_node, in_bytes(Klass::layout_helper_offset()));
3653 return make_load(NULL, lhp, TypeInt::INT, T_INT, MemNode::unordered);
3654 }
3655
3656 // We just put in an allocate/initialize with a big raw-memory effect.
3657 // Hook selected additional alias categories on the initialization.
3658 static void hook_memory_on_init(GraphKit& kit, int alias_idx,
3659 MergeMemNode* init_in_merge,
3660 Node* init_out_raw) {
3661 DEBUG_ONLY(Node* init_in_raw = init_in_merge->base_memory());
3662 assert(init_in_merge->memory_at(alias_idx) == init_in_raw, "");
3663
3664 Node* prevmem = kit.memory(alias_idx);
3665 init_in_merge->set_memory_at(alias_idx, prevmem);
3666 kit.set_memory(init_out_raw, alias_idx);
3667 }
3668
3669 //---------------------------set_output_for_allocation-------------------------
3670 Node* GraphKit::set_output_for_allocation(AllocateNode* alloc,
3671 const TypeOopPtr* oop_type,
3672 bool deoptimize_on_exception) {
3673 int rawidx = Compile::AliasIdxRaw;
3674 alloc->set_req( TypeFunc::FramePtr, frameptr() );
3675 add_safepoint_edges(alloc);
3676 Node* allocx = _gvn.transform(alloc);
3677 set_control( _gvn.transform(new ProjNode(allocx, TypeFunc::Control) ) );
3678 // create memory projection for i_o
3679 set_memory ( _gvn.transform( new ProjNode(allocx, TypeFunc::Memory, true) ), rawidx );
3680 make_slow_call_ex(allocx, env()->Throwable_klass(), true, deoptimize_on_exception);
3681
3682 // create a memory projection as for the normal control path
3683 Node* malloc = _gvn.transform(new ProjNode(allocx, TypeFunc::Memory));
3684 set_memory(malloc, rawidx);
3685
3686 // a normal slow-call doesn't change i_o, but an allocation does
3687 // we create a separate i_o projection for the normal control path
3688 set_i_o(_gvn.transform( new ProjNode(allocx, TypeFunc::I_O, false) ) );
3689 Node* rawoop = _gvn.transform( new ProjNode(allocx, TypeFunc::Parms) );
3690
3691 // put in an initialization barrier
3692 InitializeNode* init = insert_mem_bar_volatile(Op_Initialize, rawidx,
3693 rawoop)->as_Initialize();
3694 assert(alloc->initialization() == init, "2-way macro link must work");
3695 assert(init ->allocation() == alloc, "2-way macro link must work");
3696 {
3697 // Extract memory strands which may participate in the new object's
3698 // initialization, and source them from the new InitializeNode.
3699 // This will allow us to observe initializations when they occur,
3700 // and link them properly (as a group) to the InitializeNode.
3701 assert(init->in(InitializeNode::Memory) == malloc, "");
3702 MergeMemNode* minit_in = MergeMemNode::make(malloc);
3703 init->set_req(InitializeNode::Memory, minit_in);
3704 record_for_igvn(minit_in); // fold it up later, if possible
3705 _gvn.set_type(minit_in, Type::MEMORY);
3706 Node* minit_out = memory(rawidx);
3707 assert(minit_out->is_Proj() && minit_out->in(0) == init, "");
3708 // Add an edge in the MergeMem for the header fields so an access
3709 // to one of those has correct memory state
3710 set_memory(minit_out, C->get_alias_index(oop_type->add_offset(oopDesc::mark_offset_in_bytes())));
3711 set_memory(minit_out, C->get_alias_index(oop_type->add_offset(oopDesc::klass_offset_in_bytes())));
3712 if (oop_type->isa_aryptr()) {
3713 const TypeAryPtr* arytype = oop_type->is_aryptr();
3714 if (arytype->klass()->is_value_array_klass()) {
3715 ciValueArrayKlass* vak = arytype->klass()->as_value_array_klass();
3716 ciValueKlass* vk = vak->element_klass()->as_value_klass();
3717 for (int i = 0, len = vk->nof_nonstatic_fields(); i < len; i++) {
3718 ciField* field = vk->nonstatic_field_at(i);
3719 if (field->offset() >= TrackedInitializationLimit * HeapWordSize)
3720 continue; // do not bother to track really large numbers of fields
3721 int off_in_vt = field->offset() - vk->first_field_offset();
3722 const TypePtr* adr_type = arytype->with_field_offset(off_in_vt)->add_offset(Type::OffsetBot);
3723 int fieldidx = C->get_alias_index(adr_type);
3724 hook_memory_on_init(*this, fieldidx, minit_in, minit_out);
3725 }
3726 } else {
3727 const TypePtr* telemref = oop_type->add_offset(Type::OffsetBot);
3728 int elemidx = C->get_alias_index(telemref);
3729 hook_memory_on_init(*this, elemidx, minit_in, minit_out);
3730 }
3731 } else if (oop_type->isa_instptr()) {
3732 set_memory(minit_out, C->get_alias_index(oop_type)); // mark word
3733 ciInstanceKlass* ik = oop_type->klass()->as_instance_klass();
3734 for (int i = 0, len = ik->nof_nonstatic_fields(); i < len; i++) {
3735 ciField* field = ik->nonstatic_field_at(i);
3736 if (field->offset() >= TrackedInitializationLimit * HeapWordSize)
3737 continue; // do not bother to track really large numbers of fields
3738 // Find (or create) the alias category for this field:
3739 int fieldidx = C->alias_type(field)->index();
3740 hook_memory_on_init(*this, fieldidx, minit_in, minit_out);
3741 }
3742 }
3743 }
3744
3745 // Cast raw oop to the real thing...
3746 Node* javaoop = new CheckCastPPNode(control(), rawoop, oop_type);
3747 javaoop = _gvn.transform(javaoop);
3748 C->set_recent_alloc(control(), javaoop);
3749 assert(just_allocated_object(control()) == javaoop, "just allocated");
3750
3751 #ifdef ASSERT
3752 { // Verify that the AllocateNode::Ideal_allocation recognizers work:
3753 assert(AllocateNode::Ideal_allocation(rawoop, &_gvn) == alloc,
3754 "Ideal_allocation works");
3755 assert(AllocateNode::Ideal_allocation(javaoop, &_gvn) == alloc,
3756 "Ideal_allocation works");
3757 if (alloc->is_AllocateArray()) {
3758 assert(AllocateArrayNode::Ideal_array_allocation(rawoop, &_gvn) == alloc->as_AllocateArray(),
3759 "Ideal_allocation works");
3760 assert(AllocateArrayNode::Ideal_array_allocation(javaoop, &_gvn) == alloc->as_AllocateArray(),
3761 "Ideal_allocation works");
3762 } else {
3763 assert(alloc->in(AllocateNode::ALength)->is_top(), "no length, please");
3764 }
3765 }
3766 #endif //ASSERT
3767
3768 return javaoop;
3769 }
3770
3771 //---------------------------new_instance--------------------------------------
3772 // This routine takes a klass_node which may be constant (for a static type)
3773 // or may be non-constant (for reflective code). It will work equally well
3774 // for either, and the graph will fold nicely if the optimizer later reduces
3775 // the type to a constant.
3776 // The optional arguments are for specialized use by intrinsics:
3777 // - If 'extra_slow_test' if not null is an extra condition for the slow-path.
3778 // - If 'return_size_val', report the the total object size to the caller.
3779 // - deoptimize_on_exception controls how Java exceptions are handled (rethrow vs deoptimize)
3780 Node* GraphKit::new_instance(Node* klass_node,
3781 Node* extra_slow_test,
3782 Node* *return_size_val,
3783 bool deoptimize_on_exception,
3784 ValueTypeBaseNode* value_node) {
3785 // Compute size in doublewords
3786 // The size is always an integral number of doublewords, represented
3787 // as a positive bytewise size stored in the klass's layout_helper.
3788 // The layout_helper also encodes (in a low bit) the need for a slow path.
3789 jint layout_con = Klass::_lh_neutral_value;
3790 Node* layout_val = get_layout_helper(klass_node, layout_con);
3791 bool layout_is_con = (layout_val == NULL);
3792
3793 if (extra_slow_test == NULL) extra_slow_test = intcon(0);
3794 // Generate the initial go-slow test. It's either ALWAYS (return a
3795 // Node for 1) or NEVER (return a NULL) or perhaps (in the reflective
3796 // case) a computed value derived from the layout_helper.
3797 Node* initial_slow_test = NULL;
3798 if (layout_is_con) {
3799 assert(!StressReflectiveCode, "stress mode does not use these paths");
3800 bool must_go_slow = Klass::layout_helper_needs_slow_path(layout_con);
3801 initial_slow_test = must_go_slow ? intcon(1) : extra_slow_test;
3802 } else { // reflective case
3803 // This reflective path is used by Unsafe.allocateInstance.
3804 // (It may be stress-tested by specifying StressReflectiveCode.)
3805 // Basically, we want to get into the VM is there's an illegal argument.
3806 Node* bit = intcon(Klass::_lh_instance_slow_path_bit);
3807 initial_slow_test = _gvn.transform( new AndINode(layout_val, bit) );
3808 if (extra_slow_test != intcon(0)) {
3809 initial_slow_test = _gvn.transform( new OrINode(initial_slow_test, extra_slow_test) );
3810 }
3811 // (Macro-expander will further convert this to a Bool, if necessary.)
3812 }
3813
3814 // Find the size in bytes. This is easy; it's the layout_helper.
3815 // The size value must be valid even if the slow path is taken.
3816 Node* size = NULL;
3817 if (layout_is_con) {
3818 size = MakeConX(Klass::layout_helper_size_in_bytes(layout_con));
3819 } else { // reflective case
3820 // This reflective path is used by clone and Unsafe.allocateInstance.
3821 size = ConvI2X(layout_val);
3822
3823 // Clear the low bits to extract layout_helper_size_in_bytes:
3824 assert((int)Klass::_lh_instance_slow_path_bit < BytesPerLong, "clear bit");
3825 Node* mask = MakeConX(~ (intptr_t)right_n_bits(LogBytesPerLong));
3826 size = _gvn.transform( new AndXNode(size, mask) );
3827 }
3828 if (return_size_val != NULL) {
3829 (*return_size_val) = size;
3830 }
3831
3832 // This is a precise notnull oop of the klass.
3833 // (Actually, it need not be precise if this is a reflective allocation.)
3834 // It's what we cast the result to.
3835 const TypeKlassPtr* tklass = _gvn.type(klass_node)->isa_klassptr();
3836 if (!tklass) tklass = TypeKlassPtr::OBJECT;
3837 const TypeOopPtr* oop_type = tklass->as_instance_type();
3838
3839 // Now generate allocation code
3840
3841 // The entire memory state is needed for slow path of the allocation
3842 // since GC and deoptimization can happen.
3843 Node *mem = reset_memory();
3844 set_all_memory(mem); // Create new memory state
3845
3846 AllocateNode* alloc = new AllocateNode(C, AllocateNode::alloc_type(Type::TOP),
3847 control(), mem, i_o(),
3848 size, klass_node,
3849 initial_slow_test, value_node);
3850
3851 return set_output_for_allocation(alloc, oop_type, deoptimize_on_exception);
3852 }
3853
3854 // With compressed oops, the 64 bit init value for non flattened value
3855 // arrays is built from 2 32 bit compressed oops
3856 static Node* raw_default_for_coops(Node* default_value, GraphKit& kit) {
3857 Node* lower = kit.gvn().transform(new CastP2XNode(kit.control(), default_value));
3858 Node* upper = kit.gvn().transform(new LShiftLNode(lower, kit.intcon(32)));
3859 return kit.gvn().transform(new OrLNode(lower, upper));
3860 }
3861
3862 //-------------------------------new_array-------------------------------------
3863 // helper for newarray and anewarray
3864 // The 'length' parameter is (obviously) the length of the array.
3865 // See comments on new_instance for the meaning of the other arguments.
3866 Node* GraphKit::new_array(Node* klass_node, // array klass (maybe variable)
3867 Node* length, // number of array elements
3868 int nargs, // number of arguments to push back for uncommon trap
3869 Node* *return_size_val,
3870 bool deoptimize_on_exception) {
3871 jint layout_con = Klass::_lh_neutral_value;
3872 Node* layout_val = get_layout_helper(klass_node, layout_con);
3873 bool layout_is_con = (layout_val == NULL);
3874
3875 if (!layout_is_con && !StressReflectiveCode &&
3876 !too_many_traps(Deoptimization::Reason_class_check)) {
3877 // This is a reflective array creation site.
3878 // Optimistically assume that it is a subtype of Object[],
3879 // so that we can fold up all the address arithmetic.
3880 layout_con = Klass::array_layout_helper(T_OBJECT);
3881 Node* cmp_lh = _gvn.transform( new CmpINode(layout_val, intcon(layout_con)) );
3882 Node* bol_lh = _gvn.transform( new BoolNode(cmp_lh, BoolTest::eq) );
3883 { BuildCutout unless(this, bol_lh, PROB_MAX);
3884 inc_sp(nargs);
3885 uncommon_trap(Deoptimization::Reason_class_check,
3886 Deoptimization::Action_maybe_recompile);
3887 }
3888 layout_val = NULL;
3889 layout_is_con = true;
3890 }
3891
3892 // Generate the initial go-slow test. Make sure we do not overflow
3893 // if length is huge (near 2Gig) or negative! We do not need
3894 // exact double-words here, just a close approximation of needed
3895 // double-words. We can't add any offset or rounding bits, lest we
3896 // take a size -1 of bytes and make it positive. Use an unsigned
3897 // compare, so negative sizes look hugely positive.
3898 int fast_size_limit = FastAllocateSizeLimit;
3899 if (layout_is_con) {
3900 assert(!StressReflectiveCode, "stress mode does not use these paths");
3901 // Increase the size limit if we have exact knowledge of array type.
3902 int log2_esize = Klass::layout_helper_log2_element_size(layout_con);
3903 fast_size_limit <<= MAX2(LogBytesPerLong - log2_esize, 0);
3904 }
3905
3906 Node* initial_slow_cmp = _gvn.transform( new CmpUNode( length, intcon( fast_size_limit ) ) );
3907 Node* initial_slow_test = _gvn.transform( new BoolNode( initial_slow_cmp, BoolTest::gt ) );
3908
3909 // --- Size Computation ---
3910 // array_size = round_to_heap(array_header + (length << elem_shift));
3911 // where round_to_heap(x) == align_to(x, MinObjAlignmentInBytes)
3912 // and align_to(x, y) == ((x + y-1) & ~(y-1))
3913 // The rounding mask is strength-reduced, if possible.
3914 int round_mask = MinObjAlignmentInBytes - 1;
3915 Node* header_size = NULL;
3916 int header_size_min = arrayOopDesc::base_offset_in_bytes(T_BYTE);
3917 // (T_BYTE has the weakest alignment and size restrictions...)
3918 if (layout_is_con) {
3919 int hsize = Klass::layout_helper_header_size(layout_con);
3920 int eshift = Klass::layout_helper_log2_element_size(layout_con);
3921 BasicType etype = Klass::layout_helper_element_type(layout_con);
3922 bool is_value_array = Klass::layout_helper_is_valueArray(layout_con);
3923 if ((round_mask & ~right_n_bits(eshift)) == 0)
3924 round_mask = 0; // strength-reduce it if it goes away completely
3925 assert(is_value_array || (hsize & right_n_bits(eshift)) == 0, "hsize is pre-rounded");
3926 assert(header_size_min <= hsize, "generic minimum is smallest");
3927 header_size_min = hsize;
3928 header_size = intcon(hsize + round_mask);
3929 } else {
3930 Node* hss = intcon(Klass::_lh_header_size_shift);
3931 Node* hsm = intcon(Klass::_lh_header_size_mask);
3932 Node* hsize = _gvn.transform( new URShiftINode(layout_val, hss) );
3933 hsize = _gvn.transform( new AndINode(hsize, hsm) );
3934 Node* mask = intcon(round_mask);
3935 header_size = _gvn.transform( new AddINode(hsize, mask) );
3936 }
3937
3938 Node* elem_shift = NULL;
3939 if (layout_is_con) {
3940 int eshift = Klass::layout_helper_log2_element_size(layout_con);
3941 if (eshift != 0)
3942 elem_shift = intcon(eshift);
3943 } else {
3944 // There is no need to mask or shift this value.
3945 // The semantics of LShiftINode include an implicit mask to 0x1F.
3946 assert(Klass::_lh_log2_element_size_shift == 0, "use shift in place");
3947 elem_shift = layout_val;
3948 }
3949
3950 // Transition to native address size for all offset calculations:
3951 Node* lengthx = ConvI2X(length);
3952 Node* headerx = ConvI2X(header_size);
3953 #ifdef _LP64
3954 { const TypeInt* tilen = _gvn.find_int_type(length);
3955 if (tilen != NULL && tilen->_lo < 0) {
3956 // Add a manual constraint to a positive range. Cf. array_element_address.
3957 jint size_max = fast_size_limit;
3958 if (size_max > tilen->_hi) size_max = tilen->_hi;
3959 const TypeInt* tlcon = TypeInt::make(0, size_max, Type::WidenMin);
3960
3961 // Only do a narrow I2L conversion if the range check passed.
3962 IfNode* iff = new IfNode(control(), initial_slow_test, PROB_MIN, COUNT_UNKNOWN);
3963 _gvn.transform(iff);
3964 RegionNode* region = new RegionNode(3);
3965 _gvn.set_type(region, Type::CONTROL);
3966 lengthx = new PhiNode(region, TypeLong::LONG);
3967 _gvn.set_type(lengthx, TypeLong::LONG);
3968
3969 // Range check passed. Use ConvI2L node with narrow type.
3970 Node* passed = IfFalse(iff);
3971 region->init_req(1, passed);
3972 // Make I2L conversion control dependent to prevent it from
3973 // floating above the range check during loop optimizations.
3974 lengthx->init_req(1, C->constrained_convI2L(&_gvn, length, tlcon, passed));
3975
3976 // Range check failed. Use ConvI2L with wide type because length may be invalid.
3977 region->init_req(2, IfTrue(iff));
3978 lengthx->init_req(2, ConvI2X(length));
3979
3980 set_control(region);
3981 record_for_igvn(region);
3982 record_for_igvn(lengthx);
3983 }
3984 }
3985 #endif
3986
3987 // Combine header size (plus rounding) and body size. Then round down.
3988 // This computation cannot overflow, because it is used only in two
3989 // places, one where the length is sharply limited, and the other
3990 // after a successful allocation.
3991 Node* abody = lengthx;
3992 if (elem_shift != NULL)
3993 abody = _gvn.transform( new LShiftXNode(lengthx, elem_shift) );
3994 Node* size = _gvn.transform( new AddXNode(headerx, abody) );
3995 if (round_mask != 0) {
3996 Node* mask = MakeConX(~round_mask);
3997 size = _gvn.transform( new AndXNode(size, mask) );
3998 }
3999 // else if round_mask == 0, the size computation is self-rounding
4000
4001 if (return_size_val != NULL) {
4002 // This is the size
4003 (*return_size_val) = size;
4004 }
4005
4006 // Now generate allocation code
4007
4008 // The entire memory state is needed for slow path of the allocation
4009 // since GC and deoptimization can happen.
4010 Node *mem = reset_memory();
4011 set_all_memory(mem); // Create new memory state
4012
4013 if (initial_slow_test->is_Bool()) {
4014 // Hide it behind a CMoveI, or else PhaseIdealLoop::split_up will get sick.
4015 initial_slow_test = initial_slow_test->as_Bool()->as_int_value(&_gvn);
4016 }
4017
4018 const TypeOopPtr* ary_type = _gvn.type(klass_node)->is_klassptr()->as_instance_type();
4019 const TypeAryPtr* ary_ptr = ary_type->isa_aryptr();
4020 const Type* elem = NULL;
4021 ciKlass* elem_klass = NULL;
4022 if (ary_ptr != NULL) {
4023 elem = ary_ptr->elem();
4024 elem_klass = ary_ptr->klass()->as_array_klass()->element_klass();
4025 }
4026 Node* default_value = NULL;
4027 Node* raw_default_value = NULL;
4028 if (elem != NULL && elem->make_ptr()) {
4029 if (elem_klass != NULL && elem_klass->is_valuetype()) {
4030 ciValueKlass* vk = elem_klass->as_value_klass();
4031 if (!vk->flatten_array()) {
4032 default_value = ValueTypeNode::default_oop(gvn(), vk);
4033 if (elem->isa_narrowoop()) {
4034 default_value = _gvn.transform(new EncodePNode(default_value, elem));
4035 raw_default_value = raw_default_for_coops(default_value, *this);
4036 } else {
4037 raw_default_value = _gvn.transform(new CastP2XNode(control(), default_value));
4038 }
4039 }
4040 }
4041 }
4042
4043 if (EnableValhalla && (elem == NULL || (elem_klass != NULL && elem_klass->is_java_lang_Object() && !ary_type->klass_is_exact()))) {
4044 assert(raw_default_value == NULL, "shouldn't be set yet");
4045
4046 // unkown array type, could be a non flattened value array that's
4047 // initialize to a non zero default value
4048
4049 Node* r = new RegionNode(4);
4050 Node* phi = new PhiNode(r, TypeX_X);
4051
4052 Node* cmp = gen_lh_array_test(klass_node, Klass::_lh_array_tag_obj_value);
4053 Node* bol = _gvn.transform(new BoolNode(cmp, BoolTest::eq));
4054 IfNode* iff = create_and_map_if(control(), bol, PROB_FAIR, COUNT_UNKNOWN);
4055 r->init_req(1, _gvn.transform(new IfFalseNode(iff)));
4056 phi->init_req(1, MakeConX(0));
4057 set_control(_gvn.transform(new IfTrueNode(iff)));
4058 Node* k_adr = basic_plus_adr(klass_node, in_bytes(ArrayKlass::element_klass_offset()));
4059 Node* elem_klass = _gvn.transform(LoadKlassNode::make(_gvn, control(), immutable_memory(), k_adr, TypeInstPtr::KLASS));
4060 cmp = gen_value_type_test(elem_klass);
4061 bol = _gvn.transform(new BoolNode(cmp, BoolTest::eq));
4062 iff = create_and_map_if(control(), bol, PROB_FAIR, COUNT_UNKNOWN);
4063 r->init_req(2, _gvn.transform(new IfTrueNode(iff)));
4064 phi->init_req(2, MakeConX(0));
4065 set_control(_gvn.transform(new IfFalseNode(iff)));
4066
4067 Node* adr_fixed_block_addr = basic_plus_adr(elem_klass, in_bytes(InstanceKlass::adr_valueklass_fixed_block_offset()));
4068 Node* adr_fixed_block = make_load(control(), adr_fixed_block_addr, TypeRawPtr::NOTNULL, T_ADDRESS, MemNode::unordered);
4069
4070 Node* default_value_offset_addr = basic_plus_adr(adr_fixed_block, in_bytes(ValueKlass::default_value_offset_offset()));
4071 Node* default_value_offset = make_load(control(), default_value_offset_addr, TypeInt::INT, T_INT, MemNode::unordered);
4072
4073 Node* elem_mirror = load_mirror_from_klass(elem_klass);
4074
4075 Node* default_value_addr = basic_plus_adr(elem_mirror, ConvI2X(default_value_offset));
4076 const TypePtr* adr_type = _gvn.type(default_value_addr)->is_ptr();
4077 Node* val = access_load_at(elem_mirror, default_value_addr, adr_type, TypeInstPtr::BOTTOM, T_OBJECT, IN_HEAP);
4078
4079 if (UseCompressedOops) {
4080 val = _gvn.transform(new EncodePNode(val, elem));
4081 val = raw_default_for_coops(val, *this);
4082 } else {
4083 val = _gvn.transform(new CastP2XNode(control(), val));
4084 }
4085 r->init_req(3, control());
4086 phi->init_req(3, val);
4087 set_control(_gvn.transform(r));
4088 raw_default_value = _gvn.transform(phi);
4089 }
4090
4091 // Create the AllocateArrayNode and its result projections
4092 AllocateArrayNode* alloc
4093 = new AllocateArrayNode(C, AllocateArrayNode::alloc_type(TypeInt::INT),
4094 control(), mem, i_o(),
4095 size, klass_node,
4096 initial_slow_test,
4097 length, default_value,
4098 raw_default_value);
4099
4100 // Cast to correct type. Note that the klass_node may be constant or not,
4101 // and in the latter case the actual array type will be inexact also.
4102 // (This happens via a non-constant argument to inline_native_newArray.)
4103 // In any case, the value of klass_node provides the desired array type.
4104 const TypeInt* length_type = _gvn.find_int_type(length);
4105 if (ary_type->isa_aryptr() && length_type != NULL) {
4106 // Try to get a better type than POS for the size
4107 ary_type = ary_type->is_aryptr()->cast_to_size(length_type);
4108 }
4109
4110 Node* javaoop = set_output_for_allocation(alloc, ary_type, deoptimize_on_exception);
4111
4112 // Cast length on remaining path to be as narrow as possible
4113 if (map()->find_edge(length) >= 0) {
4114 Node* ccast = alloc->make_ideal_length(ary_type, &_gvn);
4115 if (ccast != length) {
4116 _gvn.set_type_bottom(ccast);
4117 record_for_igvn(ccast);
4118 replace_in_map(length, ccast);
4119 }
4120 }
4121
4122 return javaoop;
4123 }
4124
4125 // The following "Ideal_foo" functions are placed here because they recognize
4126 // the graph shapes created by the functions immediately above.
4127
4128 //---------------------------Ideal_allocation----------------------------------
4129 // Given an oop pointer or raw pointer, see if it feeds from an AllocateNode.
4130 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase) {
4131 if (ptr == NULL) { // reduce dumb test in callers
4132 return NULL;
4133 }
4134
4135 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
4136 ptr = bs->step_over_gc_barrier(ptr);
4137
4138 if (ptr->is_CheckCastPP()) { // strip only one raw-to-oop cast
4139 ptr = ptr->in(1);
4140 if (ptr == NULL) return NULL;
4141 }
4142 // Return NULL for allocations with several casts:
4143 // j.l.reflect.Array.newInstance(jobject, jint)
4144 // Object.clone()
4145 // to keep more precise type from last cast.
4146 if (ptr->is_Proj()) {
4147 Node* allo = ptr->in(0);
4148 if (allo != NULL && allo->is_Allocate()) {
4149 return allo->as_Allocate();
4150 }
4151 }
4152 // Report failure to match.
4153 return NULL;
4154 }
4155
4156 // Fancy version which also strips off an offset (and reports it to caller).
4157 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase,
4158 intptr_t& offset) {
4159 Node* base = AddPNode::Ideal_base_and_offset(ptr, phase, offset);
4160 if (base == NULL) return NULL;
4161 return Ideal_allocation(base, phase);
4162 }
4163
4164 // Trace Initialize <- Proj[Parm] <- Allocate
4165 AllocateNode* InitializeNode::allocation() {
4166 Node* rawoop = in(InitializeNode::RawAddress);
4167 if (rawoop->is_Proj()) {
4168 Node* alloc = rawoop->in(0);
4169 if (alloc->is_Allocate()) {
4170 return alloc->as_Allocate();
4171 }
4172 }
4173 return NULL;
4174 }
4175
4176 // Trace Allocate -> Proj[Parm] -> Initialize
4177 InitializeNode* AllocateNode::initialization() {
4178 ProjNode* rawoop = proj_out_or_null(AllocateNode::RawAddress);
4179 if (rawoop == NULL) return NULL;
4180 for (DUIterator_Fast imax, i = rawoop->fast_outs(imax); i < imax; i++) {
4181 Node* init = rawoop->fast_out(i);
4182 if (init->is_Initialize()) {
4183 assert(init->as_Initialize()->allocation() == this, "2-way link");
4184 return init->as_Initialize();
4185 }
4186 }
4187 return NULL;
4188 }
4189
4190 //----------------------------- loop predicates ---------------------------
4191
4192 //------------------------------add_predicate_impl----------------------------
4193 void GraphKit::add_predicate_impl(Deoptimization::DeoptReason reason, int nargs) {
4194 // Too many traps seen?
4195 if (too_many_traps(reason)) {
4196 #ifdef ASSERT
4197 if (TraceLoopPredicate) {
4198 int tc = C->trap_count(reason);
4199 tty->print("too many traps=%s tcount=%d in ",
4200 Deoptimization::trap_reason_name(reason), tc);
4201 method()->print(); // which method has too many predicate traps
4202 tty->cr();
4203 }
4204 #endif
4205 // We cannot afford to take more traps here,
4206 // do not generate predicate.
4207 return;
4208 }
4209
4210 Node *cont = _gvn.intcon(1);
4211 Node* opq = _gvn.transform(new Opaque1Node(C, cont));
4212 Node *bol = _gvn.transform(new Conv2BNode(opq));
4213 IfNode* iff = create_and_map_if(control(), bol, PROB_MAX, COUNT_UNKNOWN);
4214 Node* iffalse = _gvn.transform(new IfFalseNode(iff));
4215 C->add_predicate_opaq(opq);
4216 {
4217 PreserveJVMState pjvms(this);
4218 set_control(iffalse);
4219 inc_sp(nargs);
4220 uncommon_trap(reason, Deoptimization::Action_maybe_recompile);
4221 }
4222 Node* iftrue = _gvn.transform(new IfTrueNode(iff));
4223 set_control(iftrue);
4224 }
4225
4226 //------------------------------add_predicate---------------------------------
4227 void GraphKit::add_predicate(int nargs) {
4228 if (UseLoopPredicate) {
4229 add_predicate_impl(Deoptimization::Reason_predicate, nargs);
4230 }
4231 if (UseProfiledLoopPredicate) {
4232 add_predicate_impl(Deoptimization::Reason_profile_predicate, nargs);
4233 }
4234 // loop's limit check predicate should be near the loop.
4235 add_predicate_impl(Deoptimization::Reason_loop_limit_check, nargs);
4236 }
4237
4238 void GraphKit::sync_kit(IdealKit& ideal) {
4239 set_all_memory(ideal.merged_memory());
4240 set_i_o(ideal.i_o());
4241 set_control(ideal.ctrl());
4242 }
4243
4244 void GraphKit::final_sync(IdealKit& ideal) {
4245 // Final sync IdealKit and graphKit.
4246 sync_kit(ideal);
4247 }
4248
4249 Node* GraphKit::load_String_length(Node* str, bool set_ctrl) {
4250 Node* len = load_array_length(load_String_value(str, set_ctrl));
4251 Node* coder = load_String_coder(str, set_ctrl);
4252 // Divide length by 2 if coder is UTF16
4253 return _gvn.transform(new RShiftINode(len, coder));
4254 }
4255
4256 Node* GraphKit::load_String_value(Node* str, bool set_ctrl) {
4257 int value_offset = java_lang_String::value_offset_in_bytes();
4258 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
4259 false, NULL, Type::Offset(0));
4260 const TypePtr* value_field_type = string_type->add_offset(value_offset);
4261 const TypeAryPtr* value_type = TypeAryPtr::make(TypePtr::NotNull,
4262 TypeAry::make(TypeInt::BYTE, TypeInt::POS),
4263 ciTypeArrayKlass::make(T_BYTE), true, Type::Offset(0));
4264 Node* p = basic_plus_adr(str, str, value_offset);
4265 Node* load = access_load_at(str, p, value_field_type, value_type, T_OBJECT,
4266 IN_HEAP | (set_ctrl ? C2_CONTROL_DEPENDENT_LOAD : 0) | MO_UNORDERED);
4267 return load;
4268 }
4269
4270 Node* GraphKit::load_String_coder(Node* str, bool set_ctrl) {
4271 if (!CompactStrings) {
4272 return intcon(java_lang_String::CODER_UTF16);
4273 }
4274 int coder_offset = java_lang_String::coder_offset_in_bytes();
4275 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
4276 false, NULL, Type::Offset(0));
4277 const TypePtr* coder_field_type = string_type->add_offset(coder_offset);
4278
4279 Node* p = basic_plus_adr(str, str, coder_offset);
4280 Node* load = access_load_at(str, p, coder_field_type, TypeInt::BYTE, T_BYTE,
4281 IN_HEAP | (set_ctrl ? C2_CONTROL_DEPENDENT_LOAD : 0) | MO_UNORDERED);
4282 return load;
4283 }
4284
4285 void GraphKit::store_String_value(Node* str, Node* value) {
4286 int value_offset = java_lang_String::value_offset_in_bytes();
4287 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
4288 false, NULL, Type::Offset(0));
4289 const TypePtr* value_field_type = string_type->add_offset(value_offset);
4290
4291 access_store_at(str, basic_plus_adr(str, value_offset), value_field_type,
4292 value, TypeAryPtr::BYTES, T_OBJECT, IN_HEAP | MO_UNORDERED);
4293 }
4294
4295 void GraphKit::store_String_coder(Node* str, Node* value) {
4296 int coder_offset = java_lang_String::coder_offset_in_bytes();
4297 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
4298 false, NULL, Type::Offset(0));
4299 const TypePtr* coder_field_type = string_type->add_offset(coder_offset);
4300
4301 access_store_at(str, basic_plus_adr(str, coder_offset), coder_field_type,
4302 value, TypeInt::BYTE, T_BYTE, IN_HEAP | MO_UNORDERED);
4303 }
4304
4305 // Capture src and dst memory state with a MergeMemNode
4306 Node* GraphKit::capture_memory(const TypePtr* src_type, const TypePtr* dst_type) {
4307 if (src_type == dst_type) {
4308 // Types are equal, we don't need a MergeMemNode
4309 return memory(src_type);
4310 }
4311 MergeMemNode* merge = MergeMemNode::make(map()->memory());
4312 record_for_igvn(merge); // fold it up later, if possible
4313 int src_idx = C->get_alias_index(src_type);
4314 int dst_idx = C->get_alias_index(dst_type);
4315 merge->set_memory_at(src_idx, memory(src_idx));
4316 merge->set_memory_at(dst_idx, memory(dst_idx));
4317 return merge;
4318 }
4319
4320 Node* GraphKit::compress_string(Node* src, const TypeAryPtr* src_type, Node* dst, Node* count) {
4321 assert(Matcher::match_rule_supported(Op_StrCompressedCopy), "Intrinsic not supported");
4322 assert(src_type == TypeAryPtr::BYTES || src_type == TypeAryPtr::CHARS, "invalid source type");
4323 // If input and output memory types differ, capture both states to preserve
4324 // the dependency between preceding and subsequent loads/stores.
4325 // For example, the following program:
4326 // StoreB
4327 // compress_string
4328 // LoadB
4329 // has this memory graph (use->def):
4330 // LoadB -> compress_string -> CharMem
4331 // ... -> StoreB -> ByteMem
4332 // The intrinsic hides the dependency between LoadB and StoreB, causing
4333 // the load to read from memory not containing the result of the StoreB.
4334 // The correct memory graph should look like this:
4335 // LoadB -> compress_string -> MergeMem(CharMem, StoreB(ByteMem))
4336 Node* mem = capture_memory(src_type, TypeAryPtr::BYTES);
4337 StrCompressedCopyNode* str = new StrCompressedCopyNode(control(), mem, src, dst, count);
4338 Node* res_mem = _gvn.transform(new SCMemProjNode(str));
4339 set_memory(res_mem, TypeAryPtr::BYTES);
4340 return str;
4341 }
4342
4343 void GraphKit::inflate_string(Node* src, Node* dst, const TypeAryPtr* dst_type, Node* count) {
4344 assert(Matcher::match_rule_supported(Op_StrInflatedCopy), "Intrinsic not supported");
4345 assert(dst_type == TypeAryPtr::BYTES || dst_type == TypeAryPtr::CHARS, "invalid dest type");
4346 // Capture src and dst memory (see comment in 'compress_string').
4347 Node* mem = capture_memory(TypeAryPtr::BYTES, dst_type);
4348 StrInflatedCopyNode* str = new StrInflatedCopyNode(control(), mem, src, dst, count);
4349 set_memory(_gvn.transform(str), dst_type);
4350 }
4351
4352 void GraphKit::inflate_string_slow(Node* src, Node* dst, Node* start, Node* count) {
4353 /**
4354 * int i_char = start;
4355 * for (int i_byte = 0; i_byte < count; i_byte++) {
4356 * dst[i_char++] = (char)(src[i_byte] & 0xff);
4357 * }
4358 */
4359 src = access_resolve(src, ACCESS_READ);
4360 dst = access_resolve(dst, ACCESS_WRITE);
4361 add_predicate();
4362 RegionNode* head = new RegionNode(3);
4363 head->init_req(1, control());
4364 gvn().set_type(head, Type::CONTROL);
4365 record_for_igvn(head);
4366
4367 Node* i_byte = new PhiNode(head, TypeInt::INT);
4368 i_byte->init_req(1, intcon(0));
4369 gvn().set_type(i_byte, TypeInt::INT);
4370 record_for_igvn(i_byte);
4371
4372 Node* i_char = new PhiNode(head, TypeInt::INT);
4373 i_char->init_req(1, start);
4374 gvn().set_type(i_char, TypeInt::INT);
4375 record_for_igvn(i_char);
4376
4377 Node* mem = PhiNode::make(head, memory(TypeAryPtr::BYTES), Type::MEMORY, TypeAryPtr::BYTES);
4378 gvn().set_type(mem, Type::MEMORY);
4379 record_for_igvn(mem);
4380 set_control(head);
4381 set_memory(mem, TypeAryPtr::BYTES);
4382 Node* ch = load_array_element(control(), src, i_byte, TypeAryPtr::BYTES);
4383 Node* st = store_to_memory(control(), array_element_address(dst, i_char, T_BYTE),
4384 AndI(ch, intcon(0xff)), T_CHAR, TypeAryPtr::BYTES, MemNode::unordered,
4385 false, false, true /* mismatched */);
4386
4387 IfNode* iff = create_and_map_if(head, Bool(CmpI(i_byte, count), BoolTest::lt), PROB_FAIR, COUNT_UNKNOWN);
4388 head->init_req(2, IfTrue(iff));
4389 mem->init_req(2, st);
4390 i_byte->init_req(2, AddI(i_byte, intcon(1)));
4391 i_char->init_req(2, AddI(i_char, intcon(2)));
4392
4393 set_control(IfFalse(iff));
4394 set_memory(st, TypeAryPtr::BYTES);
4395 }
4396
4397 Node* GraphKit::make_constant_from_field(ciField* field, Node* obj) {
4398 if (!field->is_constant()) {
4399 return NULL; // Field not marked as constant.
4400 }
4401 ciInstance* holder = NULL;
4402 if (!field->is_static()) {
4403 ciObject* const_oop = obj->bottom_type()->is_oopptr()->const_oop();
4404 if (const_oop != NULL && const_oop->is_instance()) {
4405 holder = const_oop->as_instance();
4406 }
4407 }
4408 const Type* con_type = Type::make_constant_from_field(field, holder, field->layout_type(),
4409 /*is_unsigned_load=*/false);
4410 if (con_type != NULL) {
4411 Node* con = makecon(con_type);
4412 if (field->layout_type() == T_VALUETYPE && field->type()->as_value_klass()->is_scalarizable()) {
4413 // Load value type from constant oop
4414 assert(!con_type->maybe_null(), "should never be null");
4415 con = ValueTypeNode::make_from_oop(this, con, field->type()->as_value_klass());
4416 }
4417 return con;
4418 }
4419 return NULL;
4420 }
4421
4422 //---------------------------load_mirror_from_klass----------------------------
4423 // Given a klass oop, load its java mirror (a java.lang.Class oop).
4424 Node* GraphKit::load_mirror_from_klass(Node* klass) {
4425 Node* p = basic_plus_adr(klass, in_bytes(Klass::java_mirror_offset()));
4426 Node* load = make_load(NULL, p, TypeRawPtr::NOTNULL, T_ADDRESS, MemNode::unordered);
4427 // mirror = ((OopHandle)mirror)->resolve();
4428 return access_load(load, TypeInstPtr::MIRROR, T_OBJECT, IN_NATIVE);
4429 }