1 /*
2 * Copyright (c) 1997, 2015, 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 "compiler/compileLog.hpp"
27 #include "interpreter/linkResolver.hpp"
28 #include "oops/method.hpp"
29 #include "opto/addnode.hpp"
30 #include "opto/c2compiler.hpp"
31 #include "opto/castnode.hpp"
32 #include "opto/idealGraphPrinter.hpp"
33 #include "opto/locknode.hpp"
34 #include "opto/memnode.hpp"
35 #include "opto/opaquenode.hpp"
36 #include "opto/parse.hpp"
37 #include "opto/rootnode.hpp"
38 #include "opto/runtime.hpp"
39 #include "opto/valuetypenode.hpp"
40 #include "runtime/arguments.hpp"
41 #include "runtime/handles.inline.hpp"
42 #include "runtime/sharedRuntime.hpp"
43 #include "utilities/copy.hpp"
44
45 // Static array so we can figure out which bytecodes stop us from compiling
46 // the most. Some of the non-static variables are needed in bytecodeInfo.cpp
47 // and eventually should be encapsulated in a proper class (gri 8/18/98).
48
49 #ifndef PRODUCT
50 int nodes_created = 0;
51 int methods_parsed = 0;
52 int methods_seen = 0;
53 int blocks_parsed = 0;
54 int blocks_seen = 0;
55
56 int explicit_null_checks_inserted = 0;
57 int explicit_null_checks_elided = 0;
58 int all_null_checks_found = 0;
59 int implicit_null_checks = 0;
60
61 bool Parse::BytecodeParseHistogram::_initialized = false;
62 uint Parse::BytecodeParseHistogram::_bytecodes_parsed [Bytecodes::number_of_codes];
63 uint Parse::BytecodeParseHistogram::_nodes_constructed[Bytecodes::number_of_codes];
64 uint Parse::BytecodeParseHistogram::_nodes_transformed[Bytecodes::number_of_codes];
65 uint Parse::BytecodeParseHistogram::_new_values [Bytecodes::number_of_codes];
66
67 //------------------------------print_statistics-------------------------------
68 void Parse::print_statistics() {
69 tty->print_cr("--- Compiler Statistics ---");
70 tty->print("Methods seen: %d Methods parsed: %d", methods_seen, methods_parsed);
71 tty->print(" Nodes created: %d", nodes_created);
72 tty->cr();
73 if (methods_seen != methods_parsed) {
74 tty->print_cr("Reasons for parse failures (NOT cumulative):");
75 }
76 tty->print_cr("Blocks parsed: %d Blocks seen: %d", blocks_parsed, blocks_seen);
77
78 if (explicit_null_checks_inserted) {
79 tty->print_cr("%d original NULL checks - %d elided (%2d%%); optimizer leaves %d,",
80 explicit_null_checks_inserted, explicit_null_checks_elided,
81 (100*explicit_null_checks_elided)/explicit_null_checks_inserted,
82 all_null_checks_found);
83 }
84 if (all_null_checks_found) {
85 tty->print_cr("%d made implicit (%2d%%)", implicit_null_checks,
86 (100*implicit_null_checks)/all_null_checks_found);
87 }
88 if (SharedRuntime::_implicit_null_throws) {
89 tty->print_cr("%d implicit null exceptions at runtime",
90 SharedRuntime::_implicit_null_throws);
91 }
92
93 if (PrintParseStatistics && BytecodeParseHistogram::initialized()) {
94 BytecodeParseHistogram::print();
95 }
96 }
97 #endif
98
99 //------------------------------ON STACK REPLACEMENT---------------------------
100
101 // Construct a node which can be used to get incoming state for
102 // on stack replacement.
103 Node *Parse::fetch_interpreter_state(int index,
104 BasicType bt,
105 Node *local_addrs,
106 Node *local_addrs_base) {
107 Node *mem = memory(Compile::AliasIdxRaw);
108 Node *adr = basic_plus_adr( local_addrs_base, local_addrs, -index*wordSize );
109 Node *ctl = control();
110
111 // Very similar to LoadNode::make, except we handle un-aligned longs and
112 // doubles on Sparc. Intel can handle them just fine directly.
113 Node *l = NULL;
114 switch (bt) { // Signature is flattened
115 case T_INT: l = new LoadINode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeInt::INT, MemNode::unordered); break;
116 case T_FLOAT: l = new LoadFNode(ctl, mem, adr, TypeRawPtr::BOTTOM, Type::FLOAT, MemNode::unordered); break;
117 case T_ADDRESS: l = new LoadPNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM, MemNode::unordered); break;
118 case T_OBJECT: l = new LoadPNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeInstPtr::BOTTOM, MemNode::unordered); break;
119 case T_LONG:
120 case T_DOUBLE: {
121 // Since arguments are in reverse order, the argument address 'adr'
122 // refers to the back half of the long/double. Recompute adr.
123 adr = basic_plus_adr(local_addrs_base, local_addrs, -(index+1)*wordSize);
124 if (Matcher::misaligned_doubles_ok) {
125 l = (bt == T_DOUBLE)
126 ? (Node*)new LoadDNode(ctl, mem, adr, TypeRawPtr::BOTTOM, Type::DOUBLE, MemNode::unordered)
127 : (Node*)new LoadLNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeLong::LONG, MemNode::unordered);
128 } else {
129 l = (bt == T_DOUBLE)
130 ? (Node*)new LoadD_unalignedNode(ctl, mem, adr, TypeRawPtr::BOTTOM, MemNode::unordered)
131 : (Node*)new LoadL_unalignedNode(ctl, mem, adr, TypeRawPtr::BOTTOM, MemNode::unordered);
132 }
133 break;
134 }
135 default: ShouldNotReachHere();
136 }
137 return _gvn.transform(l);
138 }
139
140 // Helper routine to prevent the interpreter from handing
141 // unexpected typestate to an OSR method.
142 // The Node l is a value newly dug out of the interpreter frame.
143 // The type is the type predicted by ciTypeFlow. Note that it is
144 // not a general type, but can only come from Type::get_typeflow_type.
145 // The safepoint is a map which will feed an uncommon trap.
146 Node* Parse::check_interpreter_type(Node* l, const Type* type,
147 SafePointNode* &bad_type_exit) {
148
149 const TypeOopPtr* tp = type->isa_oopptr();
150
151 // TypeFlow may assert null-ness if a type appears unloaded.
152 if (type == TypePtr::NULL_PTR ||
153 (tp != NULL && !tp->klass()->is_loaded())) {
154 // Value must be null, not a real oop.
155 Node* chk = _gvn.transform( new CmpPNode(l, null()) );
156 Node* tst = _gvn.transform( new BoolNode(chk, BoolTest::eq) );
157 IfNode* iff = create_and_map_if(control(), tst, PROB_MAX, COUNT_UNKNOWN);
158 set_control(_gvn.transform( new IfTrueNode(iff) ));
159 Node* bad_type = _gvn.transform( new IfFalseNode(iff) );
160 bad_type_exit->control()->add_req(bad_type);
161 l = null();
162 }
163
164 // Typeflow can also cut off paths from the CFG, based on
165 // types which appear unloaded, or call sites which appear unlinked.
166 // When paths are cut off, values at later merge points can rise
167 // toward more specific classes. Make sure these specific classes
168 // are still in effect.
169 if (tp != NULL && tp->klass() != C->env()->Object_klass()) {
170 // TypeFlow asserted a specific object type. Value must have that type.
171 Node* bad_type_ctrl = NULL;
172 l = gen_checkcast(l, makecon(TypeKlassPtr::make(tp->klass())), &bad_type_ctrl);
173 bad_type_exit->control()->add_req(bad_type_ctrl);
174 }
175
176 BasicType bt_l = _gvn.type(l)->basic_type();
177 BasicType bt_t = type->basic_type();
178 assert(_gvn.type(l)->higher_equal(type), "must constrain OSR typestate");
179 return l;
180 }
181
182 // Helper routine which sets up elements of the initial parser map when
183 // performing a parse for on stack replacement. Add values into map.
184 // The only parameter contains the address of a interpreter arguments.
185 void Parse::load_interpreter_state(Node* osr_buf) {
186 int index;
187 int max_locals = jvms()->loc_size();
188 int max_stack = jvms()->stk_size();
189
190
191 // Mismatch between method and jvms can occur since map briefly held
192 // an OSR entry state (which takes up one RawPtr word).
193 assert(max_locals == method()->max_locals(), "sanity");
194 assert(max_stack >= method()->max_stack(), "sanity");
195 assert((int)jvms()->endoff() == TypeFunc::Parms + max_locals + max_stack, "sanity");
196 assert((int)jvms()->endoff() == (int)map()->req(), "sanity");
197
198 // Find the start block.
199 Block* osr_block = start_block();
200 assert(osr_block->start() == osr_bci(), "sanity");
201
202 // Set initial BCI.
203 set_parse_bci(osr_block->start());
204
205 // Set initial stack depth.
206 set_sp(osr_block->start_sp());
207
208 // Check bailouts. We currently do not perform on stack replacement
209 // of loops in catch blocks or loops which branch with a non-empty stack.
210 if (sp() != 0) {
211 C->record_method_not_compilable("OSR starts with non-empty stack");
212 return;
213 }
214 // Do not OSR inside finally clauses:
215 if (osr_block->has_trap_at(osr_block->start())) {
216 C->record_method_not_compilable("OSR starts with an immediate trap");
217 return;
218 }
219
220 // Commute monitors from interpreter frame to compiler frame.
221 assert(jvms()->monitor_depth() == 0, "should be no active locks at beginning of osr");
222 int mcnt = osr_block->flow()->monitor_count();
223 Node *monitors_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals+mcnt*2-1)*wordSize);
224 for (index = 0; index < mcnt; index++) {
225 // Make a BoxLockNode for the monitor.
226 Node *box = _gvn.transform(new BoxLockNode(next_monitor()));
227
228
229 // Displaced headers and locked objects are interleaved in the
230 // temp OSR buffer. We only copy the locked objects out here.
231 // Fetch the locked object from the OSR temp buffer and copy to our fastlock node.
232 Node *lock_object = fetch_interpreter_state(index*2, T_OBJECT, monitors_addr, osr_buf);
233 // Try and copy the displaced header to the BoxNode
234 Node *displaced_hdr = fetch_interpreter_state((index*2) + 1, T_ADDRESS, monitors_addr, osr_buf);
235
236
237 store_to_memory(control(), box, displaced_hdr, T_ADDRESS, Compile::AliasIdxRaw, MemNode::unordered);
238
239 // Build a bogus FastLockNode (no code will be generated) and push the
240 // monitor into our debug info.
241 const FastLockNode *flock = _gvn.transform(new FastLockNode( 0, lock_object, box ))->as_FastLock();
242 map()->push_monitor(flock);
243
244 // If the lock is our method synchronization lock, tuck it away in
245 // _sync_lock for return and rethrow exit paths.
246 if (index == 0 && method()->is_synchronized()) {
247 _synch_lock = flock;
248 }
249 }
250
251 // Use the raw liveness computation to make sure that unexpected
252 // values don't propagate into the OSR frame.
253 MethodLivenessResult live_locals = method()->liveness_at_bci(osr_bci());
254 if (!live_locals.is_valid()) {
255 // Degenerate or breakpointed method.
256 C->record_method_not_compilable("OSR in empty or breakpointed method");
257 return;
258 }
259
260 // Extract the needed locals from the interpreter frame.
261 Node *locals_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals-1)*wordSize);
262
263 // find all the locals that the interpreter thinks contain live oops
264 const BitMap live_oops = method()->live_local_oops_at_bci(osr_bci());
265 for (index = 0; index < max_locals; index++) {
266
267 if (!live_locals.at(index)) {
268 continue;
269 }
270
271 const Type *type = osr_block->local_type_at(index);
272
273 if (type->isa_oopptr() != NULL) {
274
275 // 6403625: Verify that the interpreter oopMap thinks that the oop is live
276 // else we might load a stale oop if the MethodLiveness disagrees with the
277 // result of the interpreter. If the interpreter says it is dead we agree
278 // by making the value go to top.
279 //
280
281 if (!live_oops.at(index)) {
282 if (C->log() != NULL) {
283 C->log()->elem("OSR_mismatch local_index='%d'",index);
284 }
285 set_local(index, null());
286 // and ignore it for the loads
287 continue;
288 }
289 }
290
291 // Filter out TOP, HALF, and BOTTOM. (Cf. ensure_phi.)
292 if (type == Type::TOP || type == Type::HALF) {
293 continue;
294 }
295 // If the type falls to bottom, then this must be a local that
296 // is mixing ints and oops or some such. Forcing it to top
297 // makes it go dead.
298 if (type == Type::BOTTOM) {
299 continue;
300 }
301 // Construct code to access the appropriate local.
302 BasicType bt = type->basic_type();
303 if (type == TypePtr::NULL_PTR) {
304 // Ptr types are mixed together with T_ADDRESS but NULL is
305 // really for T_OBJECT types so correct it.
306 bt = T_OBJECT;
307 }
308 Node *value = fetch_interpreter_state(index, bt, locals_addr, osr_buf);
309 set_local(index, value);
310 }
311
312 // Extract the needed stack entries from the interpreter frame.
313 for (index = 0; index < sp(); index++) {
314 const Type *type = osr_block->stack_type_at(index);
315 if (type != Type::TOP) {
316 // Currently the compiler bails out when attempting to on stack replace
317 // at a bci with a non-empty stack. We should not reach here.
318 ShouldNotReachHere();
319 }
320 }
321
322 // End the OSR migration
323 make_runtime_call(RC_LEAF, OptoRuntime::osr_end_Type(),
324 CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end),
325 "OSR_migration_end", TypeRawPtr::BOTTOM,
326 osr_buf);
327
328 // Now that the interpreter state is loaded, make sure it will match
329 // at execution time what the compiler is expecting now:
330 SafePointNode* bad_type_exit = clone_map();
331 bad_type_exit->set_control(new RegionNode(1));
332
333 assert(osr_block->flow()->jsrs()->size() == 0, "should be no jsrs live at osr point");
334 for (index = 0; index < max_locals; index++) {
335 if (stopped()) break;
336 Node* l = local(index);
337 if (l->is_top()) continue; // nothing here
338 const Type *type = osr_block->local_type_at(index);
339 if (type->isa_oopptr() != NULL) {
340 if (!live_oops.at(index)) {
341 // skip type check for dead oops
342 continue;
343 }
344 }
345 if (osr_block->flow()->local_type_at(index)->is_return_address()) {
346 // In our current system it's illegal for jsr addresses to be
347 // live into an OSR entry point because the compiler performs
348 // inlining of jsrs. ciTypeFlow has a bailout that detect this
349 // case and aborts the compile if addresses are live into an OSR
350 // entry point. Because of that we can assume that any address
351 // locals at the OSR entry point are dead. Method liveness
352 // isn't precise enought to figure out that they are dead in all
353 // cases so simply skip checking address locals all
354 // together. Any type check is guaranteed to fail since the
355 // interpreter type is the result of a load which might have any
356 // value and the expected type is a constant.
357 continue;
358 }
359 set_local(index, check_interpreter_type(l, type, bad_type_exit));
360 }
361
362 for (index = 0; index < sp(); index++) {
363 if (stopped()) break;
364 Node* l = stack(index);
365 if (l->is_top()) continue; // nothing here
366 const Type *type = osr_block->stack_type_at(index);
367 set_stack(index, check_interpreter_type(l, type, bad_type_exit));
368 }
369
370 if (bad_type_exit->control()->req() > 1) {
371 // Build an uncommon trap here, if any inputs can be unexpected.
372 bad_type_exit->set_control(_gvn.transform( bad_type_exit->control() ));
373 record_for_igvn(bad_type_exit->control());
374 SafePointNode* types_are_good = map();
375 set_map(bad_type_exit);
376 // The unexpected type happens because a new edge is active
377 // in the CFG, which typeflow had previously ignored.
378 // E.g., Object x = coldAtFirst() && notReached()? "str": new Integer(123).
379 // This x will be typed as Integer if notReached is not yet linked.
380 // It could also happen due to a problem in ciTypeFlow analysis.
381 uncommon_trap(Deoptimization::Reason_constraint,
382 Deoptimization::Action_reinterpret);
383 set_map(types_are_good);
384 }
385 }
386
387 //------------------------------Parse------------------------------------------
388 // Main parser constructor.
389 Parse::Parse(JVMState* caller, ciMethod* parse_method, float expected_uses)
390 : _exits(caller)
391 {
392 // Init some variables
393 _caller = caller;
394 _method = parse_method;
395 _expected_uses = expected_uses;
396 _depth = 1 + (caller->has_method() ? caller->depth() : 0);
397 _wrote_final = false;
398 _wrote_volatile = false;
399 _wrote_stable = false;
400 _wrote_fields = false;
401 _alloc_with_final = NULL;
402 _entry_bci = InvocationEntryBci;
403 _tf = NULL;
404 _block = NULL;
405 _first_return = true;
406 _replaced_nodes_for_exceptions = false;
407 _new_idx = C->unique();
408 debug_only(_block_count = -1);
409 debug_only(_blocks = (Block*)-1);
410 #ifndef PRODUCT
411 if (PrintCompilation || PrintOpto) {
412 // Make sure I have an inline tree, so I can print messages about it.
413 JVMState* ilt_caller = is_osr_parse() ? caller->caller() : caller;
414 InlineTree::find_subtree_from_root(C->ilt(), ilt_caller, parse_method);
415 }
416 _max_switch_depth = 0;
417 _est_switch_depth = 0;
418 #endif
419
420 if (parse_method->has_reserved_stack_access()) {
421 C->set_has_reserved_stack_access(true);
422 }
423
424 _tf = TypeFunc::make(method());
425 _iter.reset_to_method(method());
426 _flow = method()->get_flow_analysis();
427 if (_flow->failing()) {
428 C->record_method_not_compilable_all_tiers(_flow->failure_reason());
429 }
430
431 #ifndef PRODUCT
432 if (_flow->has_irreducible_entry()) {
433 C->set_parsed_irreducible_loop(true);
434 }
435 #endif
436
437 if (_expected_uses <= 0) {
438 _prof_factor = 1;
439 } else {
440 float prof_total = parse_method->interpreter_invocation_count();
441 if (prof_total <= _expected_uses) {
442 _prof_factor = 1;
443 } else {
444 _prof_factor = _expected_uses / prof_total;
445 }
446 }
447
448 CompileLog* log = C->log();
449 if (log != NULL) {
450 log->begin_head("parse method='%d' uses='%f'",
451 log->identify(parse_method), expected_uses);
452 if (depth() == 1 && C->is_osr_compilation()) {
453 log->print(" osr_bci='%d'", C->entry_bci());
454 }
455 log->stamp();
456 log->end_head();
457 }
458
459 // Accumulate deoptimization counts.
460 // (The range_check and store_check counts are checked elsewhere.)
461 ciMethodData* md = method()->method_data();
462 for (uint reason = 0; reason < md->trap_reason_limit(); reason++) {
463 uint md_count = md->trap_count(reason);
464 if (md_count != 0) {
465 if (md_count == md->trap_count_limit())
466 md_count += md->overflow_trap_count();
467 uint total_count = C->trap_count(reason);
468 uint old_count = total_count;
469 total_count += md_count;
470 // Saturate the add if it overflows.
471 if (total_count < old_count || total_count < md_count)
472 total_count = (uint)-1;
473 C->set_trap_count(reason, total_count);
474 if (log != NULL)
475 log->elem("observe trap='%s' count='%d' total='%d'",
476 Deoptimization::trap_reason_name(reason),
477 md_count, total_count);
478 }
479 }
480 // Accumulate total sum of decompilations, also.
481 C->set_decompile_count(C->decompile_count() + md->decompile_count());
482
483 _count_invocations = C->do_count_invocations();
484 _method_data_update = C->do_method_data_update();
485
486 if (log != NULL && method()->has_exception_handlers()) {
487 log->elem("observe that='has_exception_handlers'");
488 }
489
490 assert(method()->can_be_compiled(), "Can not parse this method, cutout earlier");
491 assert(method()->has_balanced_monitors(), "Can not parse unbalanced monitors, cutout earlier");
492
493 // Always register dependence if JVMTI is enabled, because
494 // either breakpoint setting or hotswapping of methods may
495 // cause deoptimization.
496 if (C->env()->jvmti_can_hotswap_or_post_breakpoint()) {
497 C->dependencies()->assert_evol_method(method());
498 }
499
500 NOT_PRODUCT(methods_seen++);
501
502 // Do some special top-level things.
503 if (depth() == 1 && C->is_osr_compilation()) {
504 _entry_bci = C->entry_bci();
505 _flow = method()->get_osr_flow_analysis(osr_bci());
506 if (_flow->failing()) {
507 C->record_method_not_compilable(_flow->failure_reason());
508 #ifndef PRODUCT
509 if (PrintOpto && (Verbose || WizardMode)) {
510 tty->print_cr("OSR @%d type flow bailout: %s", _entry_bci, _flow->failure_reason());
511 if (Verbose) {
512 method()->print();
513 method()->print_codes();
514 _flow->print();
515 }
516 }
517 #endif
518 }
519 _tf = C->tf(); // the OSR entry type is different
520 }
521
522 #ifdef ASSERT
523 if (depth() == 1) {
524 assert(C->is_osr_compilation() == this->is_osr_parse(), "OSR in sync");
525 if (C->tf() != tf()) {
526 MutexLockerEx ml(Compile_lock, Mutex::_no_safepoint_check_flag);
527 assert(C->env()->system_dictionary_modification_counter_changed(),
528 "Must invalidate if TypeFuncs differ");
529 }
530 } else {
531 assert(!this->is_osr_parse(), "no recursive OSR");
532 }
533 #endif
534
535 #ifndef PRODUCT
536 methods_parsed++;
537 // add method size here to guarantee that inlined methods are added too
538 if (CITime)
539 _total_bytes_compiled += method()->code_size();
540
541 show_parse_info();
542 #endif
543
544 if (failing()) {
545 if (log) log->done("parse");
546 return;
547 }
548
549 gvn().set_type(root(), root()->bottom_type());
550 gvn().transform(top());
551
552 // Import the results of the ciTypeFlow.
553 init_blocks();
554
555 // Merge point for all normal exits
556 build_exits();
557
558 // Setup the initial JVM state map.
559 SafePointNode* entry_map = create_entry_map();
560
561 // Check for bailouts during map initialization
562 if (failing() || entry_map == NULL) {
563 if (log) log->done("parse");
564 return;
565 }
566
567 Node_Notes* caller_nn = C->default_node_notes();
568 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls.
569 if (DebugInlinedCalls || depth() == 1) {
570 C->set_default_node_notes(make_node_notes(caller_nn));
571 }
572
573 if (is_osr_parse()) {
574 Node* osr_buf = entry_map->in(TypeFunc::Parms+0);
575 entry_map->set_req(TypeFunc::Parms+0, top());
576 set_map(entry_map);
577 load_interpreter_state(osr_buf);
578 } else {
579 set_map(entry_map);
580 do_method_entry();
581 if (depth() == 1 && C->age_code()) {
582 decrement_age();
583 }
584 }
585
586 if (depth() == 1 && !failing()) {
587 // Add check to deoptimize the nmethod if RTM state was changed
588 rtm_deopt();
589 }
590
591 // Check for bailouts during method entry or RTM state check setup.
592 if (failing()) {
593 if (log) log->done("parse");
594 C->set_default_node_notes(caller_nn);
595 return;
596 }
597
598 entry_map = map(); // capture any changes performed by method setup code
599 assert(jvms()->endoff() == map()->req(), "map matches JVMS layout");
600
601 // We begin parsing as if we have just encountered a jump to the
602 // method entry.
603 Block* entry_block = start_block();
604 assert(entry_block->start() == (is_osr_parse() ? osr_bci() : 0), "");
605 set_map_clone(entry_map);
606 merge_common(entry_block, entry_block->next_path_num());
607
608 #ifndef PRODUCT
609 BytecodeParseHistogram *parse_histogram_obj = new (C->env()->arena()) BytecodeParseHistogram(this, C);
610 set_parse_histogram( parse_histogram_obj );
611 #endif
612
613 // Parse all the basic blocks.
614 do_all_blocks();
615
616 C->set_default_node_notes(caller_nn);
617
618 // Check for bailouts during conversion to graph
619 if (failing()) {
620 if (log) log->done("parse");
621 return;
622 }
623
624 // Fix up all exiting control flow.
625 set_map(entry_map);
626 do_exits();
627
628 if (log) log->done("parse nodes='%d' live='%d' memory='" SIZE_FORMAT "'",
629 C->unique(), C->live_nodes(), C->node_arena()->used());
630 }
631
632 //---------------------------do_all_blocks-------------------------------------
633 void Parse::do_all_blocks() {
634 bool has_irreducible = flow()->has_irreducible_entry();
635
636 // Walk over all blocks in Reverse Post-Order.
637 while (true) {
638 bool progress = false;
639 for (int rpo = 0; rpo < block_count(); rpo++) {
640 Block* block = rpo_at(rpo);
641
642 if (block->is_parsed()) continue;
643
644 if (!block->is_merged()) {
645 // Dead block, no state reaches this block
646 continue;
647 }
648
649 // Prepare to parse this block.
650 load_state_from(block);
651
652 if (stopped()) {
653 // Block is dead.
654 continue;
655 }
656
657 NOT_PRODUCT(blocks_parsed++);
658
659 progress = true;
660 if (block->is_loop_head() || block->is_handler() || has_irreducible && !block->is_ready()) {
661 // Not all preds have been parsed. We must build phis everywhere.
662 // (Note that dead locals do not get phis built, ever.)
663 ensure_phis_everywhere();
664
665 if (block->is_SEL_head() &&
666 (UseLoopPredicate || LoopLimitCheck)) {
667 // Add predicate to single entry (not irreducible) loop head.
668 assert(!block->has_merged_backedge(), "only entry paths should be merged for now");
669 // Need correct bci for predicate.
670 // It is fine to set it here since do_one_block() will set it anyway.
671 set_parse_bci(block->start());
672 add_predicate();
673 // With value type support, uncommon traps added for loop predicates have to
674 // allocate all local value types which may throw exceptions. Handle them here.
675 do_exceptions();
676
677 // Add new region for back branches.
678 int edges = block->pred_count() - block->preds_parsed() + 1; // +1 for original region
679 RegionNode *r = new RegionNode(edges+1);
680 _gvn.set_type(r, Type::CONTROL);
681 record_for_igvn(r);
682 r->init_req(edges, control());
683 set_control(r);
684 // Add new phis.
685 ensure_phis_everywhere();
686 }
687
688 // Leave behind an undisturbed copy of the map, for future merges.
689 set_map(clone_map());
690 }
691
692 if (control()->is_Region() && !block->is_loop_head() && !has_irreducible && !block->is_handler()) {
693 // In the absence of irreducible loops, the Region and Phis
694 // associated with a merge that doesn't involve a backedge can
695 // be simplified now since the RPO parsing order guarantees
696 // that any path which was supposed to reach here has already
697 // been parsed or must be dead.
698 Node* c = control();
699 Node* result = _gvn.transform_no_reclaim(control());
700 if (c != result && TraceOptoParse) {
701 tty->print_cr("Block #%d replace %d with %d", block->rpo(), c->_idx, result->_idx);
702 }
703 if (result != top()) {
704 record_for_igvn(result);
705 }
706 }
707
708 // Parse the block.
709 do_one_block();
710
711 // Check for bailouts.
712 if (failing()) return;
713 }
714
715 // with irreducible loops multiple passes might be necessary to parse everything
716 if (!has_irreducible || !progress) {
717 break;
718 }
719 }
720
721 #ifndef PRODUCT
722 blocks_seen += block_count();
723
724 // Make sure there are no half-processed blocks remaining.
725 // Every remaining unprocessed block is dead and may be ignored now.
726 for (int rpo = 0; rpo < block_count(); rpo++) {
727 Block* block = rpo_at(rpo);
728 if (!block->is_parsed()) {
729 if (TraceOptoParse) {
730 tty->print_cr("Skipped dead block %d at bci:%d", rpo, block->start());
731 }
732 assert(!block->is_merged(), "no half-processed blocks");
733 }
734 }
735 #endif
736 }
737
738 //-------------------------------build_exits----------------------------------
739 // Build normal and exceptional exit merge points.
740 void Parse::build_exits() {
741 // make a clone of caller to prevent sharing of side-effects
742 _exits.set_map(_exits.clone_map());
743 _exits.clean_stack(_exits.sp());
744 _exits.sync_jvms();
745
746 RegionNode* region = new RegionNode(1);
747 record_for_igvn(region);
748 gvn().set_type_bottom(region);
749 _exits.set_control(region);
750
751 // Note: iophi and memphi are not transformed until do_exits.
752 Node* iophi = new PhiNode(region, Type::ABIO);
753 Node* memphi = new PhiNode(region, Type::MEMORY, TypePtr::BOTTOM);
754 gvn().set_type_bottom(iophi);
755 gvn().set_type_bottom(memphi);
756 _exits.set_i_o(iophi);
757 _exits.set_all_memory(memphi);
758
759 // Add a return value to the exit state. (Do not push it yet.)
760 if (tf()->range()->cnt() > TypeFunc::Parms) {
761 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms);
762 // Don't "bind" an unloaded return klass to the ret_phi. If the klass
763 // becomes loaded during the subsequent parsing, the loaded and unloaded
764 // types will not join when we transform and push in do_exits().
765 const TypeOopPtr* ret_oop_type = ret_type->isa_oopptr();
766 if (ret_oop_type && !ret_oop_type->klass()->is_loaded()) {
767 ret_type = TypeOopPtr::BOTTOM;
768 }
769 if (_caller->has_method() && ret_type->isa_valuetypeptr()) {
770 // When inlining, return value type as ValueTypeNode not as oop
771 ret_type = ret_type->is_valuetypeptr()->value_type();
772 }
773 int ret_size = type2size[ret_type->basic_type()];
774 Node* ret_phi = new PhiNode(region, ret_type);
775 gvn().set_type_bottom(ret_phi);
776 _exits.ensure_stack(ret_size);
777 assert((int)(tf()->range()->cnt() - TypeFunc::Parms) == ret_size, "good tf range");
778 assert(method()->return_type()->size() == ret_size, "tf agrees w/ method");
779 _exits.set_argument(0, ret_phi); // here is where the parser finds it
780 // Note: ret_phi is not yet pushed, until do_exits.
781 }
782 }
783
784
785 //----------------------------build_start_state-------------------------------
786 // Construct a state which contains only the incoming arguments from an
787 // unknown caller. The method & bci will be NULL & InvocationEntryBci.
788 JVMState* Compile::build_start_state(StartNode* start, const TypeFunc* tf) {
789 int arg_size = tf->domain()->cnt();
790 int max_size = MAX2(arg_size, (int)tf->range()->cnt());
791 JVMState* jvms = new (this) JVMState(max_size - TypeFunc::Parms);
792 SafePointNode* map = new SafePointNode(max_size, NULL);
793 record_for_igvn(map);
794 assert(arg_size == TypeFunc::Parms + (is_osr_compilation() ? 1 : method()->arg_size()), "correct arg_size");
795 Node_Notes* old_nn = default_node_notes();
796 if (old_nn != NULL && has_method()) {
797 Node_Notes* entry_nn = old_nn->clone(this);
798 JVMState* entry_jvms = new(this) JVMState(method(), old_nn->jvms());
799 entry_jvms->set_offsets(0);
800 entry_jvms->set_bci(entry_bci());
801 entry_nn->set_jvms(entry_jvms);
802 set_default_node_notes(entry_nn);
803 }
804 uint i;
805 for (i = 0; i < (uint)arg_size; i++) {
806 PhaseGVN& gvn = *initial_gvn();
807 Node* parm = gvn.transform(new ParmNode(start, i));
808 // Check if parameter is a value type pointer
809 if (gvn.type(parm)->isa_valuetypeptr()) {
810 // Create ValueTypeNode from the oop and replace the parameter
811 parm = ValueTypeNode::make(gvn, map->memory(), parm);
812 }
813 map->init_req(i, parm);
814 // Record all these guys for later GVN.
815 record_for_igvn(parm);
816 }
817 for (; i < map->req(); i++) {
818 map->init_req(i, top());
819 }
820 assert(jvms->argoff() == TypeFunc::Parms, "parser gets arguments here");
821 set_default_node_notes(old_nn);
822 map->set_jvms(jvms);
823 jvms->set_map(map);
824 return jvms;
825 }
826
827 //-----------------------------make_node_notes---------------------------------
828 Node_Notes* Parse::make_node_notes(Node_Notes* caller_nn) {
829 if (caller_nn == NULL) return NULL;
830 Node_Notes* nn = caller_nn->clone(C);
831 JVMState* caller_jvms = nn->jvms();
832 JVMState* jvms = new (C) JVMState(method(), caller_jvms);
833 jvms->set_offsets(0);
834 jvms->set_bci(_entry_bci);
835 nn->set_jvms(jvms);
836 return nn;
837 }
838
839
840 //--------------------------return_values--------------------------------------
841 void Compile::return_values(JVMState* jvms) {
842 GraphKit kit(jvms);
843 Node* ret = new ReturnNode(TypeFunc::Parms,
844 kit.control(),
845 kit.i_o(),
846 kit.reset_memory(),
847 kit.frameptr(),
848 kit.returnadr());
849 // Add zero or 1 return values
850 int ret_size = tf()->range()->cnt() - TypeFunc::Parms;
851 if (ret_size > 0) {
852 kit.inc_sp(-ret_size); // pop the return value(s)
853 kit.sync_jvms();
854 ret->add_req(kit.argument(0));
855 // Note: The second dummy edge is not needed by a ReturnNode.
856 }
857 // bind it to root
858 root()->add_req(ret);
859 record_for_igvn(ret);
860 initial_gvn()->transform_no_reclaim(ret);
861 }
862
863 //------------------------rethrow_exceptions-----------------------------------
864 // Bind all exception states in the list into a single RethrowNode.
865 void Compile::rethrow_exceptions(JVMState* jvms) {
866 GraphKit kit(jvms);
867 if (!kit.has_exceptions()) return; // nothing to generate
868 // Load my combined exception state into the kit, with all phis transformed:
869 SafePointNode* ex_map = kit.combine_and_pop_all_exception_states();
870 Node* ex_oop = kit.use_exception_state(ex_map);
871 RethrowNode* exit = new RethrowNode(kit.control(),
872 kit.i_o(), kit.reset_memory(),
873 kit.frameptr(), kit.returnadr(),
874 // like a return but with exception input
875 ex_oop);
876 // bind to root
877 root()->add_req(exit);
878 record_for_igvn(exit);
879 initial_gvn()->transform_no_reclaim(exit);
880 }
881
882 //---------------------------do_exceptions-------------------------------------
883 // Process exceptions arising from the current bytecode.
884 // Send caught exceptions to the proper handler within this method.
885 // Unhandled exceptions feed into _exit.
886 void Parse::do_exceptions() {
887 if (!has_exceptions()) return;
888
889 if (failing()) {
890 // Pop them all off and throw them away.
891 while (pop_exception_state() != NULL) ;
892 return;
893 }
894
895 PreserveJVMState pjvms(this, false);
896
897 SafePointNode* ex_map;
898 while ((ex_map = pop_exception_state()) != NULL) {
899 if (!method()->has_exception_handlers()) {
900 // Common case: Transfer control outward.
901 // Doing it this early allows the exceptions to common up
902 // even between adjacent method calls.
903 throw_to_exit(ex_map);
904 } else {
905 // Have to look at the exception first.
906 assert(stopped(), "catch_inline_exceptions trashes the map");
907 catch_inline_exceptions(ex_map);
908 stop_and_kill_map(); // we used up this exception state; kill it
909 }
910 }
911
912 // We now return to our regularly scheduled program:
913 }
914
915 //---------------------------throw_to_exit-------------------------------------
916 // Merge the given map into an exception exit from this method.
917 // The exception exit will handle any unlocking of receiver.
918 // The ex_oop must be saved within the ex_map, unlike merge_exception.
919 void Parse::throw_to_exit(SafePointNode* ex_map) {
920 // Pop the JVMS to (a copy of) the caller.
921 GraphKit caller;
922 caller.set_map_clone(_caller->map());
923 caller.set_bci(_caller->bci());
924 caller.set_sp(_caller->sp());
925 // Copy out the standard machine state:
926 for (uint i = 0; i < TypeFunc::Parms; i++) {
927 caller.map()->set_req(i, ex_map->in(i));
928 }
929 if (ex_map->has_replaced_nodes()) {
930 _replaced_nodes_for_exceptions = true;
931 }
932 caller.map()->transfer_replaced_nodes_from(ex_map, _new_idx);
933 // ...and the exception:
934 Node* ex_oop = saved_ex_oop(ex_map);
935 SafePointNode* caller_ex_map = caller.make_exception_state(ex_oop);
936 // Finally, collect the new exception state in my exits:
937 _exits.add_exception_state(caller_ex_map);
938 }
939
940 //------------------------------do_exits---------------------------------------
941 void Parse::do_exits() {
942 set_parse_bci(InvocationEntryBci);
943
944 // Now peephole on the return bits
945 Node* region = _exits.control();
946 _exits.set_control(gvn().transform(region));
947
948 Node* iophi = _exits.i_o();
949 _exits.set_i_o(gvn().transform(iophi));
950
951 // Figure out if we need to emit the trailing barrier. The barrier is only
952 // needed in the constructors, and only in three cases:
953 //
954 // 1. The constructor wrote a final. The effects of all initializations
955 // must be committed to memory before any code after the constructor
956 // publishes the reference to the newly constructed object. Rather
957 // than wait for the publication, we simply block the writes here.
958 // Rather than put a barrier on only those writes which are required
959 // to complete, we force all writes to complete.
960 //
961 // 2. On PPC64, also add MemBarRelease for constructors which write
962 // volatile fields. As support_IRIW_for_not_multiple_copy_atomic_cpu
963 // is set on PPC64, no sync instruction is issued after volatile
964 // stores. We want to guarantee the same behavior as on platforms
965 // with total store order, although this is not required by the Java
966 // memory model. So as with finals, we add a barrier here.
967 //
968 // 3. Experimental VM option is used to force the barrier if any field
969 // was written out in the constructor.
970 //
971 // "All bets are off" unless the first publication occurs after a
972 // normal return from the constructor. We do not attempt to detect
973 // such unusual early publications. But no barrier is needed on
974 // exceptional returns, since they cannot publish normally.
975 //
976 if (method()->is_initializer() &&
977 (wrote_final() ||
978 PPC64_ONLY(wrote_volatile() ||)
979 (AlwaysSafeConstructors && wrote_fields()))) {
980 _exits.insert_mem_bar(Op_MemBarRelease, alloc_with_final());
981
982 // If Memory barrier is created for final fields write
983 // and allocation node does not escape the initialize method,
984 // then barrier introduced by allocation node can be removed.
985 if (DoEscapeAnalysis && alloc_with_final()) {
986 AllocateNode *alloc = AllocateNode::Ideal_allocation(alloc_with_final(), &_gvn);
987 alloc->compute_MemBar_redundancy(method());
988 }
989 if (PrintOpto && (Verbose || WizardMode)) {
990 method()->print_name();
991 tty->print_cr(" writes finals and needs a memory barrier");
992 }
993 }
994
995 // Any method can write a @Stable field; insert memory barriers
996 // after those also. Can't bind predecessor allocation node (if any)
997 // with barrier because allocation doesn't always dominate
998 // MemBarRelease.
999 if (wrote_stable()) {
1000 _exits.insert_mem_bar(Op_MemBarRelease);
1001 if (PrintOpto && (Verbose || WizardMode)) {
1002 method()->print_name();
1003 tty->print_cr(" writes @Stable and needs a memory barrier");
1004 }
1005 }
1006
1007 for (MergeMemStream mms(_exits.merged_memory()); mms.next_non_empty(); ) {
1008 // transform each slice of the original memphi:
1009 mms.set_memory(_gvn.transform(mms.memory()));
1010 }
1011
1012 if (tf()->range()->cnt() > TypeFunc::Parms) {
1013 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms);
1014 Node* ret_phi = _gvn.transform( _exits.argument(0) );
1015 if (!_exits.control()->is_top() && _gvn.type(ret_phi)->empty()) {
1016 // In case of concurrent class loading, the type we set for the
1017 // ret_phi in build_exits() may have been too optimistic and the
1018 // ret_phi may be top now.
1019 // Otherwise, we've encountered an error and have to mark the method as
1020 // not compilable. Just using an assertion instead would be dangerous
1021 // as this could lead to an infinite compile loop in non-debug builds.
1022 {
1023 MutexLockerEx ml(Compile_lock, Mutex::_no_safepoint_check_flag);
1024 if (C->env()->system_dictionary_modification_counter_changed()) {
1025 C->record_failure(C2Compiler::retry_class_loading_during_parsing());
1026 } else {
1027 C->record_method_not_compilable("Can't determine return type.");
1028 }
1029 }
1030 return;
1031 }
1032 if (_caller->has_method() && ret_type->isa_valuetypeptr()) {
1033 // Inlined methods return a ValueTypeNode
1034 _exits.push_node(T_VALUETYPE, ret_phi);
1035 } else {
1036 _exits.push_node(ret_type->basic_type(), ret_phi);
1037 }
1038 }
1039
1040 // Note: Logic for creating and optimizing the ReturnNode is in Compile.
1041
1042 // Unlock along the exceptional paths.
1043 // This is done late so that we can common up equivalent exceptions
1044 // (e.g., null checks) arising from multiple points within this method.
1045 // See GraphKit::add_exception_state, which performs the commoning.
1046 bool do_synch = method()->is_synchronized() && GenerateSynchronizationCode;
1047
1048 // record exit from a method if compiled while Dtrace is turned on.
1049 if (do_synch || C->env()->dtrace_method_probes() || _replaced_nodes_for_exceptions) {
1050 // First move the exception list out of _exits:
1051 GraphKit kit(_exits.transfer_exceptions_into_jvms());
1052 SafePointNode* normal_map = kit.map(); // keep this guy safe
1053 // Now re-collect the exceptions into _exits:
1054 SafePointNode* ex_map;
1055 while ((ex_map = kit.pop_exception_state()) != NULL) {
1056 Node* ex_oop = kit.use_exception_state(ex_map);
1057 // Force the exiting JVM state to have this method at InvocationEntryBci.
1058 // The exiting JVM state is otherwise a copy of the calling JVMS.
1059 JVMState* caller = kit.jvms();
1060 JVMState* ex_jvms = caller->clone_shallow(C);
1061 ex_jvms->set_map(kit.clone_map());
1062 ex_jvms->map()->set_jvms(ex_jvms);
1063 ex_jvms->set_bci( InvocationEntryBci);
1064 kit.set_jvms(ex_jvms);
1065 if (do_synch) {
1066 // Add on the synchronized-method box/object combo
1067 kit.map()->push_monitor(_synch_lock);
1068 // Unlock!
1069 kit.shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node());
1070 }
1071 if (C->env()->dtrace_method_probes()) {
1072 kit.make_dtrace_method_exit(method());
1073 }
1074 if (_replaced_nodes_for_exceptions) {
1075 kit.map()->apply_replaced_nodes();
1076 }
1077 // Done with exception-path processing.
1078 ex_map = kit.make_exception_state(ex_oop);
1079 assert(ex_jvms->same_calls_as(ex_map->jvms()), "sanity");
1080 // Pop the last vestige of this method:
1081 ex_map->set_jvms(caller->clone_shallow(C));
1082 ex_map->jvms()->set_map(ex_map);
1083 _exits.push_exception_state(ex_map);
1084 }
1085 assert(_exits.map() == normal_map, "keep the same return state");
1086 }
1087
1088 {
1089 // Capture very early exceptions (receiver null checks) from caller JVMS
1090 GraphKit caller(_caller);
1091 SafePointNode* ex_map;
1092 while ((ex_map = caller.pop_exception_state()) != NULL) {
1093 _exits.add_exception_state(ex_map);
1094 }
1095 }
1096 _exits.map()->apply_replaced_nodes();
1097 }
1098
1099 //-----------------------------create_entry_map-------------------------------
1100 // Initialize our parser map to contain the types at method entry.
1101 // For OSR, the map contains a single RawPtr parameter.
1102 // Initial monitor locking for sync. methods is performed by do_method_entry.
1103 SafePointNode* Parse::create_entry_map() {
1104 // Check for really stupid bail-out cases.
1105 uint len = TypeFunc::Parms + method()->max_locals() + method()->max_stack();
1106 if (len >= 32760) {
1107 C->record_method_not_compilable_all_tiers("too many local variables");
1108 return NULL;
1109 }
1110
1111 // clear current replaced nodes that are of no use from here on (map was cloned in build_exits).
1112 _caller->map()->delete_replaced_nodes();
1113
1114 // If this is an inlined method, we may have to do a receiver null check.
1115 if (_caller->has_method() && is_normal_parse() && !method()->is_static()) {
1116 GraphKit kit(_caller);
1117 if (!kit.argument(0)->is_ValueType()) {
1118 kit.null_check_receiver_before_call(method());
1119 }
1120 _caller = kit.transfer_exceptions_into_jvms();
1121 if (kit.stopped()) {
1122 _exits.add_exception_states_from(_caller);
1123 _exits.set_jvms(_caller);
1124 return NULL;
1125 }
1126 }
1127
1128 assert(method() != NULL, "parser must have a method");
1129
1130 // Create an initial safepoint to hold JVM state during parsing
1131 JVMState* jvms = new (C) JVMState(method(), _caller->has_method() ? _caller : NULL);
1132 set_map(new SafePointNode(len, jvms));
1133 jvms->set_map(map());
1134 record_for_igvn(map());
1135 assert(jvms->endoff() == len, "correct jvms sizing");
1136
1137 SafePointNode* inmap = _caller->map();
1138 assert(inmap != NULL, "must have inmap");
1139 // In case of null check on receiver above
1140 map()->transfer_replaced_nodes_from(inmap, _new_idx);
1141
1142 uint i;
1143
1144 // Pass thru the predefined input parameters.
1145 for (i = 0; i < TypeFunc::Parms; i++) {
1146 map()->init_req(i, inmap->in(i));
1147 }
1148
1149 if (depth() == 1) {
1150 assert(map()->memory()->Opcode() == Op_Parm, "");
1151 // Insert the memory aliasing node
1152 set_all_memory(reset_memory());
1153 }
1154 assert(merged_memory(), "");
1155
1156 // Now add the locals which are initially bound to arguments:
1157 uint arg_size = tf()->domain()->cnt();
1158 ensure_stack(arg_size - TypeFunc::Parms); // OSR methods have funny args
1159 for (i = TypeFunc::Parms; i < arg_size; i++) {
1160 map()->init_req(i, inmap->argument(_caller, i - TypeFunc::Parms));
1161 }
1162
1163 // Clear out the rest of the map (locals and stack)
1164 for (i = arg_size; i < len; i++) {
1165 map()->init_req(i, top());
1166 }
1167
1168 SafePointNode* entry_map = stop();
1169 return entry_map;
1170 }
1171
1172 //-----------------------------do_method_entry--------------------------------
1173 // Emit any code needed in the pseudo-block before BCI zero.
1174 // The main thing to do is lock the receiver of a synchronized method.
1175 void Parse::do_method_entry() {
1176 set_parse_bci(InvocationEntryBci); // Pseudo-BCP
1177 set_sp(0); // Java Stack Pointer
1178
1179 NOT_PRODUCT( count_compiled_calls(true/*at_method_entry*/, false/*is_inline*/); )
1180
1181 if (C->env()->dtrace_method_probes()) {
1182 make_dtrace_method_entry(method());
1183 }
1184
1185 // If the method is synchronized, we need to construct a lock node, attach
1186 // it to the Start node, and pin it there.
1187 if (method()->is_synchronized()) {
1188 // Insert a FastLockNode right after the Start which takes as arguments
1189 // the current thread pointer, the "this" pointer & the address of the
1190 // stack slot pair used for the lock. The "this" pointer is a projection
1191 // off the start node, but the locking spot has to be constructed by
1192 // creating a ConLNode of 0, and boxing it with a BoxLockNode. The BoxLockNode
1193 // becomes the second argument to the FastLockNode call. The
1194 // FastLockNode becomes the new control parent to pin it to the start.
1195
1196 // Setup Object Pointer
1197 Node *lock_obj = NULL;
1198 if(method()->is_static()) {
1199 ciInstance* mirror = _method->holder()->java_mirror();
1200 const TypeInstPtr *t_lock = TypeInstPtr::make(mirror);
1201 lock_obj = makecon(t_lock);
1202 } else { // Else pass the "this" pointer,
1203 lock_obj = local(0); // which is Parm0 from StartNode
1204 }
1205 // Clear out dead values from the debug info.
1206 kill_dead_locals();
1207 // Build the FastLockNode
1208 _synch_lock = shared_lock(lock_obj);
1209 }
1210
1211 // Feed profiling data for parameters to the type system so it can
1212 // propagate it as speculative types
1213 record_profiled_parameters_for_speculation();
1214
1215 if (depth() == 1) {
1216 increment_and_test_invocation_counter(Tier2CompileThreshold);
1217 }
1218 }
1219
1220 //------------------------------init_blocks------------------------------------
1221 // Initialize our parser map to contain the types/monitors at method entry.
1222 void Parse::init_blocks() {
1223 // Create the blocks.
1224 _block_count = flow()->block_count();
1225 _blocks = NEW_RESOURCE_ARRAY(Block, _block_count);
1226 Copy::zero_to_bytes(_blocks, sizeof(Block)*_block_count);
1227
1228 int rpo;
1229
1230 // Initialize the structs.
1231 for (rpo = 0; rpo < block_count(); rpo++) {
1232 Block* block = rpo_at(rpo);
1233 block->init_node(this, rpo);
1234 }
1235
1236 // Collect predecessor and successor information.
1237 for (rpo = 0; rpo < block_count(); rpo++) {
1238 Block* block = rpo_at(rpo);
1239 block->init_graph(this);
1240 }
1241 }
1242
1243 //-------------------------------init_node-------------------------------------
1244 void Parse::Block::init_node(Parse* outer, int rpo) {
1245 _flow = outer->flow()->rpo_at(rpo);
1246 _pred_count = 0;
1247 _preds_parsed = 0;
1248 _count = 0;
1249 assert(pred_count() == 0 && preds_parsed() == 0, "sanity");
1250 assert(!(is_merged() || is_parsed() || is_handler() || has_merged_backedge()), "sanity");
1251 assert(_live_locals.size() == 0, "sanity");
1252
1253 // entry point has additional predecessor
1254 if (flow()->is_start()) _pred_count++;
1255 assert(flow()->is_start() == (this == outer->start_block()), "");
1256 }
1257
1258 //-------------------------------init_graph------------------------------------
1259 void Parse::Block::init_graph(Parse* outer) {
1260 // Create the successor list for this parser block.
1261 GrowableArray<ciTypeFlow::Block*>* tfs = flow()->successors();
1262 GrowableArray<ciTypeFlow::Block*>* tfe = flow()->exceptions();
1263 int ns = tfs->length();
1264 int ne = tfe->length();
1265 _num_successors = ns;
1266 _all_successors = ns+ne;
1267 _successors = (ns+ne == 0) ? NULL : NEW_RESOURCE_ARRAY(Block*, ns+ne);
1268 int p = 0;
1269 for (int i = 0; i < ns+ne; i++) {
1270 ciTypeFlow::Block* tf2 = (i < ns) ? tfs->at(i) : tfe->at(i-ns);
1271 Block* block2 = outer->rpo_at(tf2->rpo());
1272 _successors[i] = block2;
1273
1274 // Accumulate pred info for the other block, too.
1275 if (i < ns) {
1276 block2->_pred_count++;
1277 } else {
1278 block2->_is_handler = true;
1279 }
1280
1281 #ifdef ASSERT
1282 // A block's successors must be distinguishable by BCI.
1283 // That is, no bytecode is allowed to branch to two different
1284 // clones of the same code location.
1285 for (int j = 0; j < i; j++) {
1286 Block* block1 = _successors[j];
1287 if (block1 == block2) continue; // duplicates are OK
1288 assert(block1->start() != block2->start(), "successors have unique bcis");
1289 }
1290 #endif
1291 }
1292
1293 // Note: We never call next_path_num along exception paths, so they
1294 // never get processed as "ready". Also, the input phis of exception
1295 // handlers get specially processed, so that
1296 }
1297
1298 //---------------------------successor_for_bci---------------------------------
1299 Parse::Block* Parse::Block::successor_for_bci(int bci) {
1300 for (int i = 0; i < all_successors(); i++) {
1301 Block* block2 = successor_at(i);
1302 if (block2->start() == bci) return block2;
1303 }
1304 // We can actually reach here if ciTypeFlow traps out a block
1305 // due to an unloaded class, and concurrently with compilation the
1306 // class is then loaded, so that a later phase of the parser is
1307 // able to see more of the bytecode CFG. Or, the flow pass and
1308 // the parser can have a minor difference of opinion about executability
1309 // of bytecodes. For example, "obj.field = null" is executable even
1310 // if the field's type is an unloaded class; the flow pass used to
1311 // make a trap for such code.
1312 return NULL;
1313 }
1314
1315
1316 //-----------------------------stack_type_at-----------------------------------
1317 const Type* Parse::Block::stack_type_at(int i) const {
1318 return get_type(flow()->stack_type_at(i));
1319 }
1320
1321
1322 //-----------------------------local_type_at-----------------------------------
1323 const Type* Parse::Block::local_type_at(int i) const {
1324 // Make dead locals fall to bottom.
1325 if (_live_locals.size() == 0) {
1326 MethodLivenessResult live_locals = flow()->outer()->method()->liveness_at_bci(start());
1327 // This bitmap can be zero length if we saw a breakpoint.
1328 // In such cases, pretend they are all live.
1329 ((Block*)this)->_live_locals = live_locals;
1330 }
1331 if (_live_locals.size() > 0 && !_live_locals.at(i))
1332 return Type::BOTTOM;
1333
1334 return get_type(flow()->local_type_at(i));
1335 }
1336
1337
1338 #ifndef PRODUCT
1339
1340 //----------------------------name_for_bc--------------------------------------
1341 // helper method for BytecodeParseHistogram
1342 static const char* name_for_bc(int i) {
1343 return Bytecodes::is_defined(i) ? Bytecodes::name(Bytecodes::cast(i)) : "xxxunusedxxx";
1344 }
1345
1346 //----------------------------BytecodeParseHistogram------------------------------------
1347 Parse::BytecodeParseHistogram::BytecodeParseHistogram(Parse *p, Compile *c) {
1348 _parser = p;
1349 _compiler = c;
1350 if( ! _initialized ) { _initialized = true; reset(); }
1351 }
1352
1353 //----------------------------current_count------------------------------------
1354 int Parse::BytecodeParseHistogram::current_count(BPHType bph_type) {
1355 switch( bph_type ) {
1356 case BPH_transforms: { return _parser->gvn().made_progress(); }
1357 case BPH_values: { return _parser->gvn().made_new_values(); }
1358 default: { ShouldNotReachHere(); return 0; }
1359 }
1360 }
1361
1362 //----------------------------initialized--------------------------------------
1363 bool Parse::BytecodeParseHistogram::initialized() { return _initialized; }
1364
1365 //----------------------------reset--------------------------------------------
1366 void Parse::BytecodeParseHistogram::reset() {
1367 int i = Bytecodes::number_of_codes;
1368 while (i-- > 0) { _bytecodes_parsed[i] = 0; _nodes_constructed[i] = 0; _nodes_transformed[i] = 0; _new_values[i] = 0; }
1369 }
1370
1371 //----------------------------set_initial_state--------------------------------
1372 // Record info when starting to parse one bytecode
1373 void Parse::BytecodeParseHistogram::set_initial_state( Bytecodes::Code bc ) {
1374 if( PrintParseStatistics && !_parser->is_osr_parse() ) {
1375 _initial_bytecode = bc;
1376 _initial_node_count = _compiler->unique();
1377 _initial_transforms = current_count(BPH_transforms);
1378 _initial_values = current_count(BPH_values);
1379 }
1380 }
1381
1382 //----------------------------record_change--------------------------------
1383 // Record results of parsing one bytecode
1384 void Parse::BytecodeParseHistogram::record_change() {
1385 if( PrintParseStatistics && !_parser->is_osr_parse() ) {
1386 ++_bytecodes_parsed[_initial_bytecode];
1387 _nodes_constructed [_initial_bytecode] += (_compiler->unique() - _initial_node_count);
1388 _nodes_transformed [_initial_bytecode] += (current_count(BPH_transforms) - _initial_transforms);
1389 _new_values [_initial_bytecode] += (current_count(BPH_values) - _initial_values);
1390 }
1391 }
1392
1393
1394 //----------------------------print--------------------------------------------
1395 void Parse::BytecodeParseHistogram::print(float cutoff) {
1396 ResourceMark rm;
1397 // print profile
1398 int total = 0;
1399 int i = 0;
1400 for( i = 0; i < Bytecodes::number_of_codes; ++i ) { total += _bytecodes_parsed[i]; }
1401 int abs_sum = 0;
1402 tty->cr(); //0123456789012345678901234567890123456789012345678901234567890123456789
1403 tty->print_cr("Histogram of %d parsed bytecodes:", total);
1404 if( total == 0 ) { return; }
1405 tty->cr();
1406 tty->print_cr("absolute: count of compiled bytecodes of this type");
1407 tty->print_cr("relative: percentage contribution to compiled nodes");
1408 tty->print_cr("nodes : Average number of nodes constructed per bytecode");
1409 tty->print_cr("rnodes : Significance towards total nodes constructed, (nodes*relative)");
1410 tty->print_cr("transforms: Average amount of tranform progress per bytecode compiled");
1411 tty->print_cr("values : Average number of node values improved per bytecode");
1412 tty->print_cr("name : Bytecode name");
1413 tty->cr();
1414 tty->print_cr(" absolute relative nodes rnodes transforms values name");
1415 tty->print_cr("----------------------------------------------------------------------");
1416 while (--i > 0) {
1417 int abs = _bytecodes_parsed[i];
1418 float rel = abs * 100.0F / total;
1419 float nodes = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_constructed[i])/_bytecodes_parsed[i];
1420 float rnodes = _bytecodes_parsed[i] == 0 ? 0 : rel * nodes;
1421 float xforms = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_transformed[i])/_bytecodes_parsed[i];
1422 float values = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _new_values [i])/_bytecodes_parsed[i];
1423 if (cutoff <= rel) {
1424 tty->print_cr("%10d %7.2f%% %6.1f %6.2f %6.1f %6.1f %s", abs, rel, nodes, rnodes, xforms, values, name_for_bc(i));
1425 abs_sum += abs;
1426 }
1427 }
1428 tty->print_cr("----------------------------------------------------------------------");
1429 float rel_sum = abs_sum * 100.0F / total;
1430 tty->print_cr("%10d %7.2f%% (cutoff = %.2f%%)", abs_sum, rel_sum, cutoff);
1431 tty->print_cr("----------------------------------------------------------------------");
1432 tty->cr();
1433 }
1434 #endif
1435
1436 //----------------------------load_state_from----------------------------------
1437 // Load block/map/sp. But not do not touch iter/bci.
1438 void Parse::load_state_from(Block* block) {
1439 set_block(block);
1440 // load the block's JVM state:
1441 set_map(block->start_map());
1442 set_sp( block->start_sp());
1443 }
1444
1445
1446 //-----------------------------record_state------------------------------------
1447 void Parse::Block::record_state(Parse* p) {
1448 assert(!is_merged(), "can only record state once, on 1st inflow");
1449 assert(start_sp() == p->sp(), "stack pointer must agree with ciTypeFlow");
1450 set_start_map(p->stop());
1451 }
1452
1453
1454 //------------------------------do_one_block-----------------------------------
1455 void Parse::do_one_block() {
1456 if (TraceOptoParse) {
1457 Block *b = block();
1458 int ns = b->num_successors();
1459 int nt = b->all_successors();
1460
1461 tty->print("Parsing block #%d at bci [%d,%d), successors: ",
1462 block()->rpo(), block()->start(), block()->limit());
1463 for (int i = 0; i < nt; i++) {
1464 tty->print((( i < ns) ? " %d" : " %d(e)"), b->successor_at(i)->rpo());
1465 }
1466 if (b->is_loop_head()) tty->print(" lphd");
1467 tty->cr();
1468 }
1469
1470 assert(block()->is_merged(), "must be merged before being parsed");
1471 block()->mark_parsed();
1472
1473 // Set iterator to start of block.
1474 iter().reset_to_bci(block()->start());
1475
1476 CompileLog* log = C->log();
1477
1478 // Parse bytecodes
1479 while (!stopped() && !failing()) {
1480 iter().next();
1481
1482 // Learn the current bci from the iterator:
1483 set_parse_bci(iter().cur_bci());
1484
1485 if (bci() == block()->limit()) {
1486 // Do not walk into the next block until directed by do_all_blocks.
1487 merge(bci());
1488 break;
1489 }
1490 assert(bci() < block()->limit(), "bci still in block");
1491
1492 if (log != NULL) {
1493 // Output an optional context marker, to help place actions
1494 // that occur during parsing of this BC. If there is no log
1495 // output until the next context string, this context string
1496 // will be silently ignored.
1497 log->set_context("bc code='%d' bci='%d'", (int)bc(), bci());
1498 }
1499
1500 if (block()->has_trap_at(bci())) {
1501 // We must respect the flow pass's traps, because it will refuse
1502 // to produce successors for trapping blocks.
1503 int trap_index = block()->flow()->trap_index();
1504 assert(trap_index != 0, "trap index must be valid");
1505 uncommon_trap(trap_index);
1506 break;
1507 }
1508
1509 NOT_PRODUCT( parse_histogram()->set_initial_state(bc()); );
1510
1511 #ifdef ASSERT
1512 int pre_bc_sp = sp();
1513 int inputs, depth;
1514 bool have_se = !stopped() && compute_stack_effects(inputs, depth);
1515 assert(!have_se || pre_bc_sp >= inputs, "have enough stack to execute this BC: pre_bc_sp=%d, inputs=%d", pre_bc_sp, inputs);
1516 #endif //ASSERT
1517
1518 do_one_bytecode();
1519
1520 assert(!have_se || stopped() || failing() || (sp() - pre_bc_sp) == depth,
1521 "incorrect depth prediction: sp=%d, pre_bc_sp=%d, depth=%d", sp(), pre_bc_sp, depth);
1522
1523 do_exceptions();
1524
1525 NOT_PRODUCT( parse_histogram()->record_change(); );
1526
1527 if (log != NULL)
1528 log->clear_context(); // skip marker if nothing was printed
1529
1530 // Fall into next bytecode. Each bytecode normally has 1 sequential
1531 // successor which is typically made ready by visiting this bytecode.
1532 // If the successor has several predecessors, then it is a merge
1533 // point, starts a new basic block, and is handled like other basic blocks.
1534 }
1535 }
1536
1537
1538 //------------------------------merge------------------------------------------
1539 void Parse::set_parse_bci(int bci) {
1540 set_bci(bci);
1541 Node_Notes* nn = C->default_node_notes();
1542 if (nn == NULL) return;
1543
1544 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls.
1545 if (!DebugInlinedCalls && depth() > 1) {
1546 return;
1547 }
1548
1549 // Update the JVMS annotation, if present.
1550 JVMState* jvms = nn->jvms();
1551 if (jvms != NULL && jvms->bci() != bci) {
1552 // Update the JVMS.
1553 jvms = jvms->clone_shallow(C);
1554 jvms->set_bci(bci);
1555 nn->set_jvms(jvms);
1556 }
1557 }
1558
1559 //------------------------------merge------------------------------------------
1560 // Merge the current mapping into the basic block starting at bci
1561 void Parse::merge(int target_bci) {
1562 Block* target = successor_for_bci(target_bci);
1563 if (target == NULL) { handle_missing_successor(target_bci); return; }
1564 assert(!target->is_ready(), "our arrival must be expected");
1565 int pnum = target->next_path_num();
1566 merge_common(target, pnum);
1567 }
1568
1569 //-------------------------merge_new_path--------------------------------------
1570 // Merge the current mapping into the basic block, using a new path
1571 void Parse::merge_new_path(int target_bci) {
1572 Block* target = successor_for_bci(target_bci);
1573 if (target == NULL) { handle_missing_successor(target_bci); return; }
1574 assert(!target->is_ready(), "new path into frozen graph");
1575 int pnum = target->add_new_path();
1576 merge_common(target, pnum);
1577 }
1578
1579 //-------------------------merge_exception-------------------------------------
1580 // Merge the current mapping into the basic block starting at bci
1581 // The ex_oop must be pushed on the stack, unlike throw_to_exit.
1582 void Parse::merge_exception(int target_bci) {
1583 assert(sp() == 1, "must have only the throw exception on the stack");
1584 Block* target = successor_for_bci(target_bci);
1585 if (target == NULL) { handle_missing_successor(target_bci); return; }
1586 assert(target->is_handler(), "exceptions are handled by special blocks");
1587 int pnum = target->add_new_path();
1588 merge_common(target, pnum);
1589 }
1590
1591 //--------------------handle_missing_successor---------------------------------
1592 void Parse::handle_missing_successor(int target_bci) {
1593 #ifndef PRODUCT
1594 Block* b = block();
1595 int trap_bci = b->flow()->has_trap()? b->flow()->trap_bci(): -1;
1596 tty->print_cr("### Missing successor at bci:%d for block #%d (trap_bci:%d)", target_bci, b->rpo(), trap_bci);
1597 #endif
1598 ShouldNotReachHere();
1599 }
1600
1601 //--------------------------merge_common---------------------------------------
1602 void Parse::merge_common(Parse::Block* target, int pnum) {
1603 if (TraceOptoParse) {
1604 tty->print("Merging state at block #%d bci:%d", target->rpo(), target->start());
1605 }
1606
1607 // Zap extra stack slots to top
1608 assert(sp() == target->start_sp(), "");
1609 clean_stack(sp());
1610
1611 if (!target->is_merged()) { // No prior mapping at this bci
1612 if (TraceOptoParse) { tty->print(" with empty state"); }
1613
1614 // If this path is dead, do not bother capturing it as a merge.
1615 // It is "as if" we had 1 fewer predecessors from the beginning.
1616 if (stopped()) {
1617 if (TraceOptoParse) tty->print_cr(", but path is dead and doesn't count");
1618 return;
1619 }
1620
1621 // Make a region if we know there are multiple or unpredictable inputs.
1622 // (Also, if this is a plain fall-through, we might see another region,
1623 // which must not be allowed into this block's map.)
1624 if (pnum > PhiNode::Input // Known multiple inputs.
1625 || target->is_handler() // These have unpredictable inputs.
1626 || target->is_loop_head() // Known multiple inputs
1627 || control()->is_Region()) { // We must hide this guy.
1628
1629 int current_bci = bci();
1630 set_parse_bci(target->start()); // Set target bci
1631 if (target->is_SEL_head()) {
1632 DEBUG_ONLY( target->mark_merged_backedge(block()); )
1633 if (target->start() == 0) {
1634 // Add loop predicate for the special case when
1635 // there are backbranches to the method entry.
1636 add_predicate();
1637 }
1638 }
1639 // Add a Region to start the new basic block. Phis will be added
1640 // later lazily.
1641 int edges = target->pred_count();
1642 if (edges < pnum) edges = pnum; // might be a new path!
1643 RegionNode *r = new RegionNode(edges+1);
1644 gvn().set_type(r, Type::CONTROL);
1645 record_for_igvn(r);
1646 // zap all inputs to NULL for debugging (done in Node(uint) constructor)
1647 // for (int j = 1; j < edges+1; j++) { r->init_req(j, NULL); }
1648 r->init_req(pnum, control());
1649 set_control(r);
1650 set_parse_bci(current_bci); // Restore bci
1651 }
1652
1653 // Convert the existing Parser mapping into a mapping at this bci.
1654 store_state_to(target);
1655 assert(target->is_merged(), "do not come here twice");
1656
1657 } else { // Prior mapping at this bci
1658 if (TraceOptoParse) { tty->print(" with previous state"); }
1659 #ifdef ASSERT
1660 if (target->is_SEL_head()) {
1661 target->mark_merged_backedge(block());
1662 }
1663 #endif
1664 // We must not manufacture more phis if the target is already parsed.
1665 bool nophi = target->is_parsed();
1666
1667 SafePointNode* newin = map();// Hang on to incoming mapping
1668 Block* save_block = block(); // Hang on to incoming block;
1669 load_state_from(target); // Get prior mapping
1670
1671 assert(newin->jvms()->locoff() == jvms()->locoff(), "JVMS layouts agree");
1672 assert(newin->jvms()->stkoff() == jvms()->stkoff(), "JVMS layouts agree");
1673 assert(newin->jvms()->monoff() == jvms()->monoff(), "JVMS layouts agree");
1674 assert(newin->jvms()->endoff() == jvms()->endoff(), "JVMS layouts agree");
1675
1676 // Iterate over my current mapping and the old mapping.
1677 // Where different, insert Phi functions.
1678 // Use any existing Phi functions.
1679 assert(control()->is_Region(), "must be merging to a region");
1680 RegionNode* r = control()->as_Region();
1681
1682 // Compute where to merge into
1683 // Merge incoming control path
1684 r->init_req(pnum, newin->control());
1685
1686 if (pnum == 1) { // Last merge for this Region?
1687 if (!block()->flow()->is_irreducible_entry()) {
1688 Node* result = _gvn.transform_no_reclaim(r);
1689 if (r != result && TraceOptoParse) {
1690 tty->print_cr("Block #%d replace %d with %d", block()->rpo(), r->_idx, result->_idx);
1691 }
1692 }
1693 record_for_igvn(r);
1694 }
1695
1696 // Update all the non-control inputs to map:
1697 assert(TypeFunc::Parms == newin->jvms()->locoff(), "parser map should contain only youngest jvms");
1698 bool check_elide_phi = target->is_SEL_backedge(save_block);
1699 for (uint j = 1; j < newin->req(); j++) {
1700 Node* m = map()->in(j); // Current state of target.
1701 Node* n = newin->in(j); // Incoming change to target state.
1702 PhiNode* phi;
1703 if (m->is_Phi() && m->as_Phi()->region() == r)
1704 phi = m->as_Phi();
1705 else
1706 phi = NULL;
1707 if (m != n) { // Different; must merge
1708 switch (j) {
1709 // Frame pointer and Return Address never changes
1710 case TypeFunc::FramePtr:// Drop m, use the original value
1711 case TypeFunc::ReturnAdr:
1712 break;
1713 case TypeFunc::Memory: // Merge inputs to the MergeMem node
1714 assert(phi == NULL, "the merge contains phis, not vice versa");
1715 merge_memory_edges(n->as_MergeMem(), pnum, nophi);
1716 continue;
1717 default: // All normal stuff
1718 if (phi == NULL) {
1719 const JVMState* jvms = map()->jvms();
1720 if (EliminateNestedLocks &&
1721 jvms->is_mon(j) && jvms->is_monitor_box(j)) {
1722 // BoxLock nodes are not commoning.
1723 // Use old BoxLock node as merged box.
1724 assert(newin->jvms()->is_monitor_box(j), "sanity");
1725 // This assert also tests that nodes are BoxLock.
1726 assert(BoxLockNode::same_slot(n, m), "sanity");
1727 C->gvn_replace_by(n, m);
1728 } else if (!check_elide_phi || !target->can_elide_SEL_phi(j)) {
1729 phi = ensure_phi(j, nophi);
1730 }
1731 }
1732 break;
1733 }
1734 }
1735 // At this point, n might be top if:
1736 // - there is no phi (because TypeFlow detected a conflict), or
1737 // - the corresponding control edges is top (a dead incoming path)
1738 // It is a bug if we create a phi which sees a garbage value on a live path.
1739
1740 // Merging two value types?
1741 if (n->isa_ValueType() && m != n) {
1742 assert(phi == NULL, "Value types should not have Phis");
1743 // Reload current state because it may have been updated by ensure_phi
1744 m = map()->in(j);
1745 ValueTypeNode* vtm = m->as_ValueType(); // Current value type
1746 ValueTypeNode* vtn = n->as_ValueType(); // Incoming value type
1747 if (TraceOptoParse) {
1748 tty->print_cr("Merging value types");
1749 #ifdef ASSERT
1750 tty->print_cr("Current:");
1751 vtm->dump(1);
1752 tty->print_cr("Incoming:");
1753 vtn->dump(1);
1754 #endif
1755 }
1756 // Merge oop inputs
1757 phi = vtm->get_oop()->as_Phi();
1758 phi->set_req(pnum, vtn->get_oop());
1759 if (pnum == PhiNode::Input) {
1760 // Last merge
1761 vtm->set_oop(_gvn.transform_no_reclaim(phi));
1762 record_for_igvn(phi);
1763 }
1764 // Merge field values
1765 for (uint index = 0; index < vtm->field_count(); ++index) {
1766 phi = vtm->get_field_value(index)->as_Phi();
1767 phi->set_req(pnum, vtn->get_field_value(index));
1768 if (pnum == PhiNode::Input) {
1769 // Last merge
1770 vtm->set_field_value(index, _gvn.transform_no_reclaim(phi));
1771 record_for_igvn(phi);
1772 }
1773 }
1774 } else if (phi != NULL) {
1775 assert(n != top() || r->in(pnum) == top(), "live value must not be garbage");
1776 assert(phi->region() == r, "");
1777 phi->set_req(pnum, n); // Then add 'n' to the merge
1778 if (pnum == PhiNode::Input) {
1779 // Last merge for this Phi.
1780 // So far, Phis have had a reasonable type from ciTypeFlow.
1781 // Now _gvn will join that with the meet of current inputs.
1782 // BOTTOM is never permissible here, 'cause pessimistically
1783 // Phis of pointers cannot lose the basic pointer type.
1784 debug_only(const Type* bt1 = phi->bottom_type());
1785 assert(bt1 != Type::BOTTOM, "should not be building conflict phis");
1786 map()->set_req(j, _gvn.transform_no_reclaim(phi));
1787 debug_only(const Type* bt2 = phi->bottom_type());
1788 assert(bt2->higher_equal_speculative(bt1), "must be consistent with type-flow");
1789 record_for_igvn(phi);
1790 }
1791 }
1792 } // End of for all values to be merged
1793
1794 if (pnum == PhiNode::Input &&
1795 !r->in(0)) { // The occasional useless Region
1796 assert(control() == r, "");
1797 set_control(r->nonnull_req());
1798 }
1799
1800 map()->merge_replaced_nodes_with(newin);
1801
1802 // newin has been subsumed into the lazy merge, and is now dead.
1803 set_block(save_block);
1804
1805 stop(); // done with this guy, for now
1806 }
1807
1808 if (TraceOptoParse) {
1809 tty->print_cr(" on path %d", pnum);
1810 }
1811
1812 // Done with this parser state.
1813 assert(stopped(), "");
1814 }
1815
1816
1817 //--------------------------merge_memory_edges---------------------------------
1818 void Parse::merge_memory_edges(MergeMemNode* n, int pnum, bool nophi) {
1819 // (nophi means we must not create phis, because we already parsed here)
1820 assert(n != NULL, "");
1821 // Merge the inputs to the MergeMems
1822 MergeMemNode* m = merged_memory();
1823
1824 assert(control()->is_Region(), "must be merging to a region");
1825 RegionNode* r = control()->as_Region();
1826
1827 PhiNode* base = NULL;
1828 MergeMemNode* remerge = NULL;
1829 for (MergeMemStream mms(m, n); mms.next_non_empty2(); ) {
1830 Node *p = mms.force_memory();
1831 Node *q = mms.memory2();
1832 if (mms.is_empty() && nophi) {
1833 // Trouble: No new splits allowed after a loop body is parsed.
1834 // Instead, wire the new split into a MergeMem on the backedge.
1835 // The optimizer will sort it out, slicing the phi.
1836 if (remerge == NULL) {
1837 assert(base != NULL, "");
1838 assert(base->in(0) != NULL, "should not be xformed away");
1839 remerge = MergeMemNode::make(base->in(pnum));
1840 gvn().set_type(remerge, Type::MEMORY);
1841 base->set_req(pnum, remerge);
1842 }
1843 remerge->set_memory_at(mms.alias_idx(), q);
1844 continue;
1845 }
1846 assert(!q->is_MergeMem(), "");
1847 PhiNode* phi;
1848 if (p != q) {
1849 phi = ensure_memory_phi(mms.alias_idx(), nophi);
1850 } else {
1851 if (p->is_Phi() && p->as_Phi()->region() == r)
1852 phi = p->as_Phi();
1853 else
1854 phi = NULL;
1855 }
1856 // Insert q into local phi
1857 if (phi != NULL) {
1858 assert(phi->region() == r, "");
1859 p = phi;
1860 phi->set_req(pnum, q);
1861 if (mms.at_base_memory()) {
1862 base = phi; // delay transforming it
1863 } else if (pnum == 1) {
1864 record_for_igvn(phi);
1865 p = _gvn.transform_no_reclaim(phi);
1866 }
1867 mms.set_memory(p);// store back through the iterator
1868 }
1869 }
1870 // Transform base last, in case we must fiddle with remerging.
1871 if (base != NULL && pnum == 1) {
1872 record_for_igvn(base);
1873 m->set_base_memory( _gvn.transform_no_reclaim(base) );
1874 }
1875 }
1876
1877
1878 //------------------------ensure_phis_everywhere-------------------------------
1879 void Parse::ensure_phis_everywhere() {
1880 ensure_phi(TypeFunc::I_O);
1881
1882 // Ensure a phi on all currently known memories.
1883 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) {
1884 ensure_memory_phi(mms.alias_idx());
1885 debug_only(mms.set_memory()); // keep the iterator happy
1886 }
1887
1888 // Note: This is our only chance to create phis for memory slices.
1889 // If we miss a slice that crops up later, it will have to be
1890 // merged into the base-memory phi that we are building here.
1891 // Later, the optimizer will comb out the knot, and build separate
1892 // phi-loops for each memory slice that matters.
1893
1894 // Monitors must nest nicely and not get confused amongst themselves.
1895 // Phi-ify everything up to the monitors, though.
1896 uint monoff = map()->jvms()->monoff();
1897 uint nof_monitors = map()->jvms()->nof_monitors();
1898
1899 assert(TypeFunc::Parms == map()->jvms()->locoff(), "parser map should contain only youngest jvms");
1900 bool check_elide_phi = block()->is_SEL_head();
1901 for (uint i = TypeFunc::Parms; i < monoff; i++) {
1902 if (!check_elide_phi || !block()->can_elide_SEL_phi(i)) {
1903 ensure_phi(i);
1904 }
1905 }
1906
1907 // Even monitors need Phis, though they are well-structured.
1908 // This is true for OSR methods, and also for the rare cases where
1909 // a monitor object is the subject of a replace_in_map operation.
1910 // See bugs 4426707 and 5043395.
1911 for (uint m = 0; m < nof_monitors; m++) {
1912 ensure_phi(map()->jvms()->monitor_obj_offset(m));
1913 }
1914 }
1915
1916
1917 //-----------------------------add_new_path------------------------------------
1918 // Add a previously unaccounted predecessor to this block.
1919 int Parse::Block::add_new_path() {
1920 // If there is no map, return the lowest unused path number.
1921 if (!is_merged()) return pred_count()+1; // there will be a map shortly
1922
1923 SafePointNode* map = start_map();
1924 if (!map->control()->is_Region())
1925 return pred_count()+1; // there may be a region some day
1926 RegionNode* r = map->control()->as_Region();
1927
1928 // Add new path to the region.
1929 uint pnum = r->req();
1930 r->add_req(NULL);
1931
1932 for (uint i = 1; i < map->req(); i++) {
1933 Node* n = map->in(i);
1934 if (i == TypeFunc::Memory) {
1935 // Ensure a phi on all currently known memories.
1936 for (MergeMemStream mms(n->as_MergeMem()); mms.next_non_empty(); ) {
1937 Node* phi = mms.memory();
1938 if (phi->is_Phi() && phi->as_Phi()->region() == r) {
1939 assert(phi->req() == pnum, "must be same size as region");
1940 phi->add_req(NULL);
1941 }
1942 }
1943 } else {
1944 if (n->is_Phi() && n->as_Phi()->region() == r) {
1945 assert(n->req() == pnum, "must be same size as region");
1946 n->add_req(NULL);
1947 }
1948 }
1949 }
1950
1951 return pnum;
1952 }
1953
1954 //------------------------------ensure_phi-------------------------------------
1955 // Turn the idx'th entry of the current map into a Phi
1956 PhiNode *Parse::ensure_phi(int idx, bool nocreate) {
1957 SafePointNode* map = this->map();
1958 Node* region = map->control();
1959 assert(region->is_Region(), "");
1960
1961 Node* o = map->in(idx);
1962 assert(o != NULL, "");
1963
1964 if (o == top()) return NULL; // TOP always merges into TOP
1965
1966 if (o->is_Phi() && o->as_Phi()->region() == region) {
1967 return o->as_Phi();
1968 }
1969
1970 ValueTypeNode* vt = o->isa_ValueType();
1971 if (vt != NULL && vt->get_oop()->is_Phi() && vt->get_oop()->as_Phi()->region() == region) {
1972 // ValueTypeNode already has Phi inputs
1973 return NULL;
1974 }
1975
1976 // Now use a Phi here for merging
1977 assert(!nocreate, "Cannot build a phi for a block already parsed.");
1978 const JVMState* jvms = map->jvms();
1979 const Type* t = NULL;
1980 if (jvms->is_loc(idx)) {
1981 t = block()->local_type_at(idx - jvms->locoff());
1982 } else if (jvms->is_stk(idx)) {
1983 t = block()->stack_type_at(idx - jvms->stkoff());
1984 } else if (jvms->is_mon(idx)) {
1985 assert(!jvms->is_monitor_box(idx), "no phis for boxes");
1986 t = TypeInstPtr::BOTTOM; // this is sufficient for a lock object
1987 } else if ((uint)idx < TypeFunc::Parms) {
1988 t = o->bottom_type(); // Type::RETURN_ADDRESS or such-like.
1989 } else {
1990 assert(false, "no type information for this phi");
1991 }
1992
1993 // If the type falls to bottom, then this must be a local that
1994 // is mixing ints and oops or some such. Forcing it to top
1995 // makes it go dead.
1996 if (t == Type::BOTTOM) {
1997 map->set_req(idx, top());
1998 return NULL;
1999 }
2000
2001 // Do not create phis for top either.
2002 // A top on a non-null control flow must be an unused even after the.phi.
2003 if (t == Type::TOP || t == Type::HALF) {
2004 map->set_req(idx, top());
2005 return NULL;
2006 }
2007
2008 // Value types are merged by merging their field values
2009 if (vt != NULL) {
2010 // Create new ValueTypeNode that represents the merged value type
2011 vt = vt->clone()->as_ValueType();
2012
2013 // Create a PhiNode for merging the oop
2014 const TypeValueTypePtr* vtptr = TypeValueTypePtr::make(t->is_valuetype());
2015 PhiNode* oop = PhiNode::make(region, vt->get_oop(), vtptr);
2016 gvn().set_type(oop, vtptr);
2017 vt->set_oop(oop);
2018
2019 // Create a PhiNode for merging each field value
2020 for (uint i = 0; i < vt->field_count(); ++i) {
2021 const Type* field_type = Type::get_const_basic_type(vt->get_field_type(i));
2022 PhiNode* phi = PhiNode::make(region, vt->get_field_value(i), field_type);
2023 gvn().set_type(phi, field_type);
2024 vt->set_field_value(i, phi);
2025 }
2026
2027 // Update map to use cloned value type
2028 gvn().set_type(vt, t);
2029 map->set_req(idx, vt);
2030 return NULL;
2031 }
2032
2033 PhiNode* phi = PhiNode::make(region, o, t);
2034 gvn().set_type(phi, t);
2035 if (C->do_escape_analysis()) record_for_igvn(phi);
2036 map->set_req(idx, phi);
2037 return phi;
2038 }
2039
2040 //--------------------------ensure_memory_phi----------------------------------
2041 // Turn the idx'th slice of the current memory into a Phi
2042 PhiNode *Parse::ensure_memory_phi(int idx, bool nocreate) {
2043 MergeMemNode* mem = merged_memory();
2044 Node* region = control();
2045 assert(region->is_Region(), "");
2046
2047 Node *o = (idx == Compile::AliasIdxBot)? mem->base_memory(): mem->memory_at(idx);
2048 assert(o != NULL && o != top(), "");
2049
2050 PhiNode* phi;
2051 if (o->is_Phi() && o->as_Phi()->region() == region) {
2052 phi = o->as_Phi();
2053 if (phi == mem->base_memory() && idx >= Compile::AliasIdxRaw) {
2054 // clone the shared base memory phi to make a new memory split
2055 assert(!nocreate, "Cannot build a phi for a block already parsed.");
2056 const Type* t = phi->bottom_type();
2057 const TypePtr* adr_type = C->get_adr_type(idx);
2058 phi = phi->slice_memory(adr_type);
2059 gvn().set_type(phi, t);
2060 }
2061 return phi;
2062 }
2063
2064 // Now use a Phi here for merging
2065 assert(!nocreate, "Cannot build a phi for a block already parsed.");
2066 const Type* t = o->bottom_type();
2067 const TypePtr* adr_type = C->get_adr_type(idx);
2068 phi = PhiNode::make(region, o, t, adr_type);
2069 gvn().set_type(phi, t);
2070 if (idx == Compile::AliasIdxBot)
2071 mem->set_base_memory(phi);
2072 else
2073 mem->set_memory_at(idx, phi);
2074 return phi;
2075 }
2076
2077 //------------------------------call_register_finalizer-----------------------
2078 // Check the klass of the receiver and call register_finalizer if the
2079 // class need finalization.
2080 void Parse::call_register_finalizer() {
2081 Node* receiver = local(0);
2082 assert(receiver != NULL && receiver->bottom_type()->isa_instptr() != NULL,
2083 "must have non-null instance type");
2084
2085 const TypeInstPtr *tinst = receiver->bottom_type()->isa_instptr();
2086 if (tinst != NULL && tinst->klass()->is_loaded() && !tinst->klass_is_exact()) {
2087 // The type isn't known exactly so see if CHA tells us anything.
2088 ciInstanceKlass* ik = tinst->klass()->as_instance_klass();
2089 if (!Dependencies::has_finalizable_subclass(ik)) {
2090 // No finalizable subclasses so skip the dynamic check.
2091 C->dependencies()->assert_has_no_finalizable_subclasses(ik);
2092 return;
2093 }
2094 }
2095
2096 // Insert a dynamic test for whether the instance needs
2097 // finalization. In general this will fold up since the concrete
2098 // class is often visible so the access flags are constant.
2099 Node* klass_addr = basic_plus_adr( receiver, receiver, oopDesc::klass_offset_in_bytes() );
2100 Node* klass = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), klass_addr, TypeInstPtr::KLASS));
2101
2102 Node* access_flags_addr = basic_plus_adr(klass, klass, in_bytes(Klass::access_flags_offset()));
2103 Node* access_flags = make_load(NULL, access_flags_addr, TypeInt::INT, T_INT, MemNode::unordered);
2104
2105 Node* mask = _gvn.transform(new AndINode(access_flags, intcon(JVM_ACC_HAS_FINALIZER)));
2106 Node* check = _gvn.transform(new CmpINode(mask, intcon(0)));
2107 Node* test = _gvn.transform(new BoolNode(check, BoolTest::ne));
2108
2109 IfNode* iff = create_and_map_if(control(), test, PROB_MAX, COUNT_UNKNOWN);
2110
2111 RegionNode* result_rgn = new RegionNode(3);
2112 record_for_igvn(result_rgn);
2113
2114 Node *skip_register = _gvn.transform(new IfFalseNode(iff));
2115 result_rgn->init_req(1, skip_register);
2116
2117 Node *needs_register = _gvn.transform(new IfTrueNode(iff));
2118 set_control(needs_register);
2119 if (stopped()) {
2120 // There is no slow path.
2121 result_rgn->init_req(2, top());
2122 } else {
2123 Node *call = make_runtime_call(RC_NO_LEAF,
2124 OptoRuntime::register_finalizer_Type(),
2125 OptoRuntime::register_finalizer_Java(),
2126 NULL, TypePtr::BOTTOM,
2127 receiver);
2128 make_slow_call_ex(call, env()->Throwable_klass(), true);
2129
2130 Node* fast_io = call->in(TypeFunc::I_O);
2131 Node* fast_mem = call->in(TypeFunc::Memory);
2132 // These two phis are pre-filled with copies of of the fast IO and Memory
2133 Node* io_phi = PhiNode::make(result_rgn, fast_io, Type::ABIO);
2134 Node* mem_phi = PhiNode::make(result_rgn, fast_mem, Type::MEMORY, TypePtr::BOTTOM);
2135
2136 result_rgn->init_req(2, control());
2137 io_phi ->init_req(2, i_o());
2138 mem_phi ->init_req(2, reset_memory());
2139
2140 set_all_memory( _gvn.transform(mem_phi) );
2141 set_i_o( _gvn.transform(io_phi) );
2142 }
2143
2144 set_control( _gvn.transform(result_rgn) );
2145 }
2146
2147 // Add check to deoptimize if RTM state is not ProfileRTM
2148 void Parse::rtm_deopt() {
2149 #if INCLUDE_RTM_OPT
2150 if (C->profile_rtm()) {
2151 assert(C->method() != NULL, "only for normal compilations");
2152 assert(!C->method()->method_data()->is_empty(), "MDO is needed to record RTM state");
2153 assert(depth() == 1, "generate check only for main compiled method");
2154
2155 // Set starting bci for uncommon trap.
2156 set_parse_bci(is_osr_parse() ? osr_bci() : 0);
2157
2158 // Load the rtm_state from the MethodData.
2159 const TypePtr* adr_type = TypeMetadataPtr::make(C->method()->method_data());
2160 Node* mdo = makecon(adr_type);
2161 int offset = MethodData::rtm_state_offset_in_bytes();
2162 Node* adr_node = basic_plus_adr(mdo, mdo, offset);
2163 Node* rtm_state = make_load(control(), adr_node, TypeInt::INT, T_INT, adr_type, MemNode::unordered);
2164
2165 // Separate Load from Cmp by Opaque.
2166 // In expand_macro_nodes() it will be replaced either
2167 // with this load when there are locks in the code
2168 // or with ProfileRTM (cmp->in(2)) otherwise so that
2169 // the check will fold.
2170 Node* profile_state = makecon(TypeInt::make(ProfileRTM));
2171 Node* opq = _gvn.transform( new Opaque3Node(C, rtm_state, Opaque3Node::RTM_OPT) );
2172 Node* chk = _gvn.transform( new CmpINode(opq, profile_state) );
2173 Node* tst = _gvn.transform( new BoolNode(chk, BoolTest::eq) );
2174 // Branch to failure if state was changed
2175 { BuildCutout unless(this, tst, PROB_ALWAYS);
2176 uncommon_trap(Deoptimization::Reason_rtm_state_change,
2177 Deoptimization::Action_make_not_entrant);
2178 }
2179 }
2180 #endif
2181 }
2182
2183 void Parse::decrement_age() {
2184 MethodCounters* mc = method()->ensure_method_counters();
2185 if (mc == NULL) {
2186 C->record_failure("Must have MCs");
2187 return;
2188 }
2189 assert(!is_osr_parse(), "Not doing this for OSRs");
2190
2191 // Set starting bci for uncommon trap.
2192 set_parse_bci(0);
2193
2194 const TypePtr* adr_type = TypeRawPtr::make((address)mc);
2195 Node* mc_adr = makecon(adr_type);
2196 Node* cnt_adr = basic_plus_adr(mc_adr, mc_adr, in_bytes(MethodCounters::nmethod_age_offset()));
2197 Node* cnt = make_load(control(), cnt_adr, TypeInt::INT, T_INT, adr_type, MemNode::unordered);
2198 Node* decr = _gvn.transform(new SubINode(cnt, makecon(TypeInt::ONE)));
2199 store_to_memory(control(), cnt_adr, decr, T_INT, adr_type, MemNode::unordered);
2200 Node *chk = _gvn.transform(new CmpINode(decr, makecon(TypeInt::ZERO)));
2201 Node* tst = _gvn.transform(new BoolNode(chk, BoolTest::gt));
2202 { BuildCutout unless(this, tst, PROB_ALWAYS);
2203 uncommon_trap(Deoptimization::Reason_tenured,
2204 Deoptimization::Action_make_not_entrant);
2205 }
2206 }
2207
2208 //------------------------------return_current---------------------------------
2209 // Append current _map to _exit_return
2210 void Parse::return_current(Node* value) {
2211 if (value != NULL && value->is_ValueType() && !_caller->has_method()) {
2212 // Returning from root JVMState, make sure value type is allocated
2213 value = value->as_ValueType()->store_to_memory(this);
2214 }
2215
2216 if (RegisterFinalizersAtInit &&
2217 method()->intrinsic_id() == vmIntrinsics::_Object_init) {
2218 call_register_finalizer();
2219 }
2220
2221 // Do not set_parse_bci, so that return goo is credited to the return insn.
2222 set_bci(InvocationEntryBci);
2223 if (method()->is_synchronized() && GenerateSynchronizationCode) {
2224 shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node());
2225 }
2226 if (C->env()->dtrace_method_probes()) {
2227 make_dtrace_method_exit(method());
2228 }
2229 SafePointNode* exit_return = _exits.map();
2230 exit_return->in( TypeFunc::Control )->add_req( control() );
2231 exit_return->in( TypeFunc::I_O )->add_req( i_o () );
2232 Node *mem = exit_return->in( TypeFunc::Memory );
2233 for (MergeMemStream mms(mem->as_MergeMem(), merged_memory()); mms.next_non_empty2(); ) {
2234 if (mms.is_empty()) {
2235 // get a copy of the base memory, and patch just this one input
2236 const TypePtr* adr_type = mms.adr_type(C);
2237 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type);
2238 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), "");
2239 gvn().set_type_bottom(phi);
2240 phi->del_req(phi->req()-1); // prepare to re-patch
2241 mms.set_memory(phi);
2242 }
2243 mms.memory()->add_req(mms.memory2());
2244 }
2245
2246 // frame pointer is always same, already captured
2247 if (value != NULL) {
2248 // If returning oops to an interface-return, there is a silent free
2249 // cast from oop to interface allowed by the Verifier. Make it explicit
2250 // here.
2251 Node* phi = _exits.argument(0);
2252 const TypeInstPtr *tr = phi->bottom_type()->isa_instptr();
2253 if (tr && tr->klass()->is_loaded() &&
2254 tr->klass()->is_interface()) {
2255 const TypeInstPtr *tp = value->bottom_type()->isa_instptr();
2256 if (tp && tp->klass()->is_loaded() &&
2257 !tp->klass()->is_interface()) {
2258 // sharpen the type eagerly; this eases certain assert checking
2259 if (tp->higher_equal(TypeInstPtr::NOTNULL))
2260 tr = tr->join_speculative(TypeInstPtr::NOTNULL)->is_instptr();
2261 value = _gvn.transform(new CheckCastPPNode(0, value, tr));
2262 }
2263 } else {
2264 // Also handle returns of oop-arrays to an arrays-of-interface return
2265 const TypeInstPtr* phi_tip;
2266 const TypeInstPtr* val_tip;
2267 Type::get_arrays_base_elements(phi->bottom_type(), value->bottom_type(), &phi_tip, &val_tip);
2268 if (phi_tip != NULL && phi_tip->is_loaded() && phi_tip->klass()->is_interface() &&
2269 val_tip != NULL && val_tip->is_loaded() && !val_tip->klass()->is_interface()) {
2270 value = _gvn.transform(new CheckCastPPNode(0, value, phi->bottom_type()));
2271 }
2272 }
2273 phi->add_req(value);
2274 }
2275
2276 if (_first_return) {
2277 _exits.map()->transfer_replaced_nodes_from(map(), _new_idx);
2278 _first_return = false;
2279 } else {
2280 _exits.map()->merge_replaced_nodes_with(map());
2281 }
2282
2283 stop_and_kill_map(); // This CFG path dies here
2284 }
2285
2286
2287 //------------------------------add_safepoint----------------------------------
2288 void Parse::add_safepoint() {
2289 // See if we can avoid this safepoint. No need for a SafePoint immediately
2290 // after a Call (except Leaf Call) or another SafePoint.
2291 Node *proj = control();
2292 bool add_poll_param = SafePointNode::needs_polling_address_input();
2293 uint parms = add_poll_param ? TypeFunc::Parms+1 : TypeFunc::Parms;
2294 if( proj->is_Proj() ) {
2295 Node *n0 = proj->in(0);
2296 if( n0->is_Catch() ) {
2297 n0 = n0->in(0)->in(0);
2298 assert( n0->is_Call(), "expect a call here" );
2299 }
2300 if( n0->is_Call() ) {
2301 if( n0->as_Call()->guaranteed_safepoint() )
2302 return;
2303 } else if( n0->is_SafePoint() && n0->req() >= parms ) {
2304 return;
2305 }
2306 }
2307
2308 // Clear out dead values from the debug info.
2309 kill_dead_locals();
2310
2311 // Clone the JVM State
2312 SafePointNode *sfpnt = new SafePointNode(parms, NULL);
2313
2314 // Capture memory state BEFORE a SafePoint. Since we can block at a
2315 // SafePoint we need our GC state to be safe; i.e. we need all our current
2316 // write barriers (card marks) to not float down after the SafePoint so we
2317 // must read raw memory. Likewise we need all oop stores to match the card
2318 // marks. If deopt can happen, we need ALL stores (we need the correct JVM
2319 // state on a deopt).
2320
2321 // We do not need to WRITE the memory state after a SafePoint. The control
2322 // edge will keep card-marks and oop-stores from floating up from below a
2323 // SafePoint and our true dependency added here will keep them from floating
2324 // down below a SafePoint.
2325
2326 // Clone the current memory state
2327 Node* mem = MergeMemNode::make(map()->memory());
2328
2329 mem = _gvn.transform(mem);
2330
2331 // Pass control through the safepoint
2332 sfpnt->init_req(TypeFunc::Control , control());
2333 // Fix edges normally used by a call
2334 sfpnt->init_req(TypeFunc::I_O , top() );
2335 sfpnt->init_req(TypeFunc::Memory , mem );
2336 sfpnt->init_req(TypeFunc::ReturnAdr, top() );
2337 sfpnt->init_req(TypeFunc::FramePtr , top() );
2338
2339 // Create a node for the polling address
2340 if( add_poll_param ) {
2341 Node *polladr = ConPNode::make((address)os::get_polling_page());
2342 sfpnt->init_req(TypeFunc::Parms+0, _gvn.transform(polladr));
2343 }
2344
2345 // Fix up the JVM State edges
2346 add_safepoint_edges(sfpnt);
2347 Node *transformed_sfpnt = _gvn.transform(sfpnt);
2348 set_control(transformed_sfpnt);
2349
2350 // Provide an edge from root to safepoint. This makes the safepoint
2351 // appear useful until the parse has completed.
2352 if( OptoRemoveUseless && transformed_sfpnt->is_SafePoint() ) {
2353 assert(C->root() != NULL, "Expect parse is still valid");
2354 C->root()->add_prec(transformed_sfpnt);
2355 }
2356 }
2357
2358 #ifndef PRODUCT
2359 //------------------------show_parse_info--------------------------------------
2360 void Parse::show_parse_info() {
2361 InlineTree* ilt = NULL;
2362 if (C->ilt() != NULL) {
2363 JVMState* caller_jvms = is_osr_parse() ? caller()->caller() : caller();
2364 ilt = InlineTree::find_subtree_from_root(C->ilt(), caller_jvms, method());
2365 }
2366 if (PrintCompilation && Verbose) {
2367 if (depth() == 1) {
2368 if( ilt->count_inlines() ) {
2369 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
2370 ilt->count_inline_bcs());
2371 tty->cr();
2372 }
2373 } else {
2374 if (method()->is_synchronized()) tty->print("s");
2375 if (method()->has_exception_handlers()) tty->print("!");
2376 // Check this is not the final compiled version
2377 if (C->trap_can_recompile()) {
2378 tty->print("-");
2379 } else {
2380 tty->print(" ");
2381 }
2382 method()->print_short_name();
2383 if (is_osr_parse()) {
2384 tty->print(" @ %d", osr_bci());
2385 }
2386 tty->print(" (%d bytes)",method()->code_size());
2387 if (ilt->count_inlines()) {
2388 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
2389 ilt->count_inline_bcs());
2390 }
2391 tty->cr();
2392 }
2393 }
2394 if (PrintOpto && (depth() == 1 || PrintOptoInlining)) {
2395 // Print that we succeeded; suppress this message on the first osr parse.
2396
2397 if (method()->is_synchronized()) tty->print("s");
2398 if (method()->has_exception_handlers()) tty->print("!");
2399 // Check this is not the final compiled version
2400 if (C->trap_can_recompile() && depth() == 1) {
2401 tty->print("-");
2402 } else {
2403 tty->print(" ");
2404 }
2405 if( depth() != 1 ) { tty->print(" "); } // missing compile count
2406 for (int i = 1; i < depth(); ++i) { tty->print(" "); }
2407 method()->print_short_name();
2408 if (is_osr_parse()) {
2409 tty->print(" @ %d", osr_bci());
2410 }
2411 if (ilt->caller_bci() != -1) {
2412 tty->print(" @ %d", ilt->caller_bci());
2413 }
2414 tty->print(" (%d bytes)",method()->code_size());
2415 if (ilt->count_inlines()) {
2416 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
2417 ilt->count_inline_bcs());
2418 }
2419 tty->cr();
2420 }
2421 }
2422
2423
2424 //------------------------------dump-------------------------------------------
2425 // Dump information associated with the bytecodes of current _method
2426 void Parse::dump() {
2427 if( method() != NULL ) {
2428 // Iterate over bytecodes
2429 ciBytecodeStream iter(method());
2430 for( Bytecodes::Code bc = iter.next(); bc != ciBytecodeStream::EOBC() ; bc = iter.next() ) {
2431 dump_bci( iter.cur_bci() );
2432 tty->cr();
2433 }
2434 }
2435 }
2436
2437 // Dump information associated with a byte code index, 'bci'
2438 void Parse::dump_bci(int bci) {
2439 // Output info on merge-points, cloning, and within _jsr..._ret
2440 // NYI
2441 tty->print(" bci:%d", bci);
2442 }
2443
2444 #endif