1 /*
2 * Copyright (c) 1997, 2024, 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 "memory/resourceArea.hpp"
29 #include "oops/method.hpp"
30 #include "opto/addnode.hpp"
31 #include "opto/c2compiler.hpp"
32 #include "opto/castnode.hpp"
33 #include "opto/convertnode.hpp"
34 #include "opto/idealGraphPrinter.hpp"
35 #include "opto/inlinetypenode.hpp"
36 #include "opto/locknode.hpp"
37 #include "opto/memnode.hpp"
38 #include "opto/opaquenode.hpp"
39 #include "opto/parse.hpp"
40 #include "opto/rootnode.hpp"
41 #include "opto/runtime.hpp"
42 #include "opto/type.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/safepointMechanism.hpp"
45 #include "runtime/sharedRuntime.hpp"
46 #include "utilities/bitMap.inline.hpp"
47 #include "utilities/copy.hpp"
48
49 // Static array so we can figure out which bytecodes stop us from compiling
50 // the most. Some of the non-static variables are needed in bytecodeInfo.cpp
51 // and eventually should be encapsulated in a proper class (gri 8/18/98).
52
53 #ifndef PRODUCT
54 uint nodes_created = 0;
55 uint methods_parsed = 0;
56 uint methods_seen = 0;
57 uint blocks_parsed = 0;
58 uint blocks_seen = 0;
59
60 uint explicit_null_checks_inserted = 0;
61 uint explicit_null_checks_elided = 0;
62 uint all_null_checks_found = 0;
63 uint implicit_null_checks = 0;
64
65 bool Parse::BytecodeParseHistogram::_initialized = false;
66 uint Parse::BytecodeParseHistogram::_bytecodes_parsed [Bytecodes::number_of_codes];
67 uint Parse::BytecodeParseHistogram::_nodes_constructed[Bytecodes::number_of_codes];
68 uint Parse::BytecodeParseHistogram::_nodes_transformed[Bytecodes::number_of_codes];
69 uint Parse::BytecodeParseHistogram::_new_values [Bytecodes::number_of_codes];
70
71 //------------------------------print_statistics-------------------------------
72 void Parse::print_statistics() {
73 tty->print_cr("--- Compiler Statistics ---");
74 tty->print("Methods seen: %u Methods parsed: %u", methods_seen, methods_parsed);
75 tty->print(" Nodes created: %u", nodes_created);
76 tty->cr();
77 if (methods_seen != methods_parsed) {
78 tty->print_cr("Reasons for parse failures (NOT cumulative):");
79 }
80 tty->print_cr("Blocks parsed: %u Blocks seen: %u", blocks_parsed, blocks_seen);
81
82 if (explicit_null_checks_inserted) {
83 tty->print_cr("%u original null checks - %u elided (%2u%%); optimizer leaves %u,",
84 explicit_null_checks_inserted, explicit_null_checks_elided,
85 (100*explicit_null_checks_elided)/explicit_null_checks_inserted,
86 all_null_checks_found);
87 }
88 if (all_null_checks_found) {
89 tty->print_cr("%u made implicit (%2u%%)", implicit_null_checks,
90 (100*implicit_null_checks)/all_null_checks_found);
91 }
92 if (SharedRuntime::_implicit_null_throws) {
93 tty->print_cr("%u implicit null exceptions at runtime",
94 SharedRuntime::_implicit_null_throws);
95 }
96
97 if (PrintParseStatistics && BytecodeParseHistogram::initialized()) {
98 BytecodeParseHistogram::print();
99 }
100 }
101 #endif
102
103 //------------------------------ON STACK REPLACEMENT---------------------------
104
105 // Construct a node which can be used to get incoming state for
106 // on stack replacement.
107 Node* Parse::fetch_interpreter_state(int index,
108 const Type* type,
109 Node* local_addrs,
110 Node* local_addrs_base) {
111 BasicType bt = type->basic_type();
112 if (type == TypePtr::NULL_PTR) {
113 // Ptr types are mixed together with T_ADDRESS but nullptr is
114 // really for T_OBJECT types so correct it.
115 bt = T_OBJECT;
116 }
117 Node *mem = memory(Compile::AliasIdxRaw);
118 Node *adr = basic_plus_adr( local_addrs_base, local_addrs, -index*wordSize );
119 Node *ctl = control();
120
121 // Very similar to LoadNode::make, except we handle un-aligned longs and
122 // doubles on Sparc. Intel can handle them just fine directly.
123 Node *l = nullptr;
124 switch (bt) { // Signature is flattened
125 case T_INT: l = new LoadINode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeInt::INT, MemNode::unordered); break;
126 case T_FLOAT: l = new LoadFNode(ctl, mem, adr, TypeRawPtr::BOTTOM, Type::FLOAT, MemNode::unordered); break;
127 case T_ADDRESS: l = new LoadPNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM, MemNode::unordered); break;
128 case T_OBJECT: l = new LoadPNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeInstPtr::BOTTOM, MemNode::unordered); break;
129 case T_LONG:
130 case T_DOUBLE: {
131 // Since arguments are in reverse order, the argument address 'adr'
132 // refers to the back half of the long/double. Recompute adr.
133 adr = basic_plus_adr(local_addrs_base, local_addrs, -(index+1)*wordSize);
134 if (Matcher::misaligned_doubles_ok) {
135 l = (bt == T_DOUBLE)
136 ? (Node*)new LoadDNode(ctl, mem, adr, TypeRawPtr::BOTTOM, Type::DOUBLE, MemNode::unordered)
137 : (Node*)new LoadLNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeLong::LONG, MemNode::unordered);
138 } else {
139 l = (bt == T_DOUBLE)
140 ? (Node*)new LoadD_unalignedNode(ctl, mem, adr, TypeRawPtr::BOTTOM, MemNode::unordered)
141 : (Node*)new LoadL_unalignedNode(ctl, mem, adr, TypeRawPtr::BOTTOM, MemNode::unordered);
142 }
143 break;
144 }
145 default: ShouldNotReachHere();
146 }
147 return _gvn.transform(l);
148 }
149
150 // Helper routine to prevent the interpreter from handing
151 // unexpected typestate to an OSR method.
152 // The Node l is a value newly dug out of the interpreter frame.
153 // The type is the type predicted by ciTypeFlow. Note that it is
154 // not a general type, but can only come from Type::get_typeflow_type.
155 // The safepoint is a map which will feed an uncommon trap.
156 Node* Parse::check_interpreter_type(Node* l, const Type* type,
157 SafePointNode* &bad_type_exit) {
158 const TypeOopPtr* tp = type->isa_oopptr();
159
160 // TypeFlow may assert null-ness if a type appears unloaded.
161 if (type == TypePtr::NULL_PTR ||
162 (tp != nullptr && !tp->is_loaded())) {
163 // Value must be null, not a real oop.
164 Node* chk = _gvn.transform( new CmpPNode(l, null()) );
165 Node* tst = _gvn.transform( new BoolNode(chk, BoolTest::eq) );
166 IfNode* iff = create_and_map_if(control(), tst, PROB_MAX, COUNT_UNKNOWN);
167 set_control(_gvn.transform( new IfTrueNode(iff) ));
168 Node* bad_type = _gvn.transform( new IfFalseNode(iff) );
169 bad_type_exit->control()->add_req(bad_type);
170 l = null();
171 }
172
173 // Typeflow can also cut off paths from the CFG, based on
174 // types which appear unloaded, or call sites which appear unlinked.
175 // When paths are cut off, values at later merge points can rise
176 // toward more specific classes. Make sure these specific classes
177 // are still in effect.
178 if (tp != nullptr && !tp->is_same_java_type_as(TypeInstPtr::BOTTOM)) {
179 // TypeFlow asserted a specific object type. Value must have that type.
180 Node* bad_type_ctrl = nullptr;
181 if (tp->is_inlinetypeptr() && !tp->maybe_null()) {
182 // Check inline types for null here to prevent checkcast from adding an
183 // exception state before the bytecode entry (use 'bad_type_ctrl' instead).
184 l = null_check_oop(l, &bad_type_ctrl);
185 bad_type_exit->control()->add_req(bad_type_ctrl);
186 }
187 l = gen_checkcast(l, makecon(tp->as_klass_type()->cast_to_exactness(true)), &bad_type_ctrl);
188 bad_type_exit->control()->add_req(bad_type_ctrl);
189 }
190
191 assert(_gvn.type(l)->higher_equal(type), "must constrain OSR typestate");
192 return l;
193 }
194
195 // Helper routine which sets up elements of the initial parser map when
196 // performing a parse for on stack replacement. Add values into map.
197 // The only parameter contains the address of a interpreter arguments.
198 void Parse::load_interpreter_state(Node* osr_buf) {
199 int index;
200 int max_locals = jvms()->loc_size();
201 int max_stack = jvms()->stk_size();
202
203 // Mismatch between method and jvms can occur since map briefly held
204 // an OSR entry state (which takes up one RawPtr word).
205 assert(max_locals == method()->max_locals(), "sanity");
206 assert(max_stack >= method()->max_stack(), "sanity");
207 assert((int)jvms()->endoff() == TypeFunc::Parms + max_locals + max_stack, "sanity");
208 assert((int)jvms()->endoff() == (int)map()->req(), "sanity");
209
210 // Find the start block.
211 Block* osr_block = start_block();
212 assert(osr_block->start() == osr_bci(), "sanity");
213
214 // Set initial BCI.
215 set_parse_bci(osr_block->start());
216
217 // Set initial stack depth.
218 set_sp(osr_block->start_sp());
219
220 // Check bailouts. We currently do not perform on stack replacement
221 // of loops in catch blocks or loops which branch with a non-empty stack.
222 if (sp() != 0) {
223 C->record_method_not_compilable("OSR starts with non-empty stack");
224 return;
225 }
226 // Do not OSR inside finally clauses:
227 if (osr_block->has_trap_at(osr_block->start())) {
228 assert(false, "OSR starts with an immediate trap");
229 C->record_method_not_compilable("OSR starts with an immediate trap");
230 return;
231 }
232
233 // Commute monitors from interpreter frame to compiler frame.
234 assert(jvms()->monitor_depth() == 0, "should be no active locks at beginning of osr");
235 int mcnt = osr_block->flow()->monitor_count();
236 Node *monitors_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals+mcnt*2-1)*wordSize);
237 for (index = 0; index < mcnt; index++) {
238 // Make a BoxLockNode for the monitor.
239 BoxLockNode* osr_box = new BoxLockNode(next_monitor());
240 // Check for bailout after new BoxLockNode
241 if (failing()) { return; }
242
243 // This OSR locking region is unbalanced because it does not have Lock node:
244 // locking was done in Interpreter.
245 // This is similar to Coarsened case when Lock node is eliminated
246 // and as result the region is marked as Unbalanced.
247
248 // Emulate Coarsened state transition from Regular to Unbalanced.
249 osr_box->set_coarsened();
250 osr_box->set_unbalanced();
251
252 Node* box = _gvn.transform(osr_box);
253
254 // Displaced headers and locked objects are interleaved in the
255 // temp OSR buffer. We only copy the locked objects out here.
256 // Fetch the locked object from the OSR temp buffer and copy to our fastlock node.
257 Node* lock_object = fetch_interpreter_state(index*2, Type::get_const_basic_type(T_OBJECT), monitors_addr, osr_buf);
258 // Try and copy the displaced header to the BoxNode
259 Node* displaced_hdr = fetch_interpreter_state((index*2) + 1, Type::get_const_basic_type(T_ADDRESS), monitors_addr, osr_buf);
260
261 store_to_memory(control(), box, displaced_hdr, T_ADDRESS, Compile::AliasIdxRaw, MemNode::unordered);
262
263 // Build a bogus FastLockNode (no code will be generated) and push the
264 // monitor into our debug info.
265 const FastLockNode *flock = _gvn.transform(new FastLockNode( nullptr, lock_object, box ))->as_FastLock();
266 map()->push_monitor(flock);
267
268 // If the lock is our method synchronization lock, tuck it away in
269 // _sync_lock for return and rethrow exit paths.
270 if (index == 0 && method()->is_synchronized()) {
271 _synch_lock = flock;
272 }
273 }
274
275 // Use the raw liveness computation to make sure that unexpected
276 // values don't propagate into the OSR frame.
277 MethodLivenessResult live_locals = method()->liveness_at_bci(osr_bci());
278 if (!live_locals.is_valid()) {
279 // Degenerate or breakpointed method.
280 assert(false, "OSR in empty or breakpointed method");
281 C->record_method_not_compilable("OSR in empty or breakpointed method");
282 return;
283 }
284
285 // Extract the needed locals from the interpreter frame.
286 Node *locals_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals-1)*wordSize);
287
288 // find all the locals that the interpreter thinks contain live oops
289 const ResourceBitMap live_oops = method()->live_local_oops_at_bci(osr_bci());
290 for (index = 0; index < max_locals; index++) {
291
292 if (!live_locals.at(index)) {
293 continue;
294 }
295
296 const Type *type = osr_block->local_type_at(index);
297
298 if (type->isa_oopptr() != nullptr) {
299
300 // 6403625: Verify that the interpreter oopMap thinks that the oop is live
301 // else we might load a stale oop if the MethodLiveness disagrees with the
302 // result of the interpreter. If the interpreter says it is dead we agree
303 // by making the value go to top.
304 //
305
306 if (!live_oops.at(index)) {
307 if (C->log() != nullptr) {
308 C->log()->elem("OSR_mismatch local_index='%d'",index);
309 }
310 set_local(index, null());
311 // and ignore it for the loads
312 continue;
313 }
314 }
315
316 // Filter out TOP, HALF, and BOTTOM. (Cf. ensure_phi.)
317 if (type == Type::TOP || type == Type::HALF) {
318 continue;
319 }
320 // If the type falls to bottom, then this must be a local that
321 // is mixing ints and oops or some such. Forcing it to top
322 // makes it go dead.
323 if (type == Type::BOTTOM) {
324 continue;
325 }
326 // Construct code to access the appropriate local.
327 Node* value = fetch_interpreter_state(index, type, locals_addr, osr_buf);
328 set_local(index, value);
329 }
330
331 // Extract the needed stack entries from the interpreter frame.
332 for (index = 0; index < sp(); index++) {
333 const Type *type = osr_block->stack_type_at(index);
334 if (type != Type::TOP) {
335 // Currently the compiler bails out when attempting to on stack replace
336 // at a bci with a non-empty stack. We should not reach here.
337 ShouldNotReachHere();
338 }
339 }
340
341 // End the OSR migration
342 make_runtime_call(RC_LEAF, OptoRuntime::osr_end_Type(),
343 CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end),
344 "OSR_migration_end", TypeRawPtr::BOTTOM,
345 osr_buf);
346
347 // Now that the interpreter state is loaded, make sure it will match
348 // at execution time what the compiler is expecting now:
349 SafePointNode* bad_type_exit = clone_map();
350 bad_type_exit->set_control(new RegionNode(1));
351
352 assert(osr_block->flow()->jsrs()->size() == 0, "should be no jsrs live at osr point");
353 for (index = 0; index < max_locals; index++) {
354 if (stopped()) break;
355 Node* l = local(index);
356 if (l->is_top()) continue; // nothing here
357 const Type *type = osr_block->local_type_at(index);
358 if (type->isa_oopptr() != nullptr) {
359 if (!live_oops.at(index)) {
360 // skip type check for dead oops
361 continue;
362 }
363 }
364 if (osr_block->flow()->local_type_at(index)->is_return_address()) {
365 // In our current system it's illegal for jsr addresses to be
366 // live into an OSR entry point because the compiler performs
367 // inlining of jsrs. ciTypeFlow has a bailout that detect this
368 // case and aborts the compile if addresses are live into an OSR
369 // entry point. Because of that we can assume that any address
370 // locals at the OSR entry point are dead. Method liveness
371 // isn't precise enough to figure out that they are dead in all
372 // cases so simply skip checking address locals all
373 // together. Any type check is guaranteed to fail since the
374 // interpreter type is the result of a load which might have any
375 // value and the expected type is a constant.
376 continue;
377 }
378 set_local(index, check_interpreter_type(l, type, bad_type_exit));
379 }
380
381 for (index = 0; index < sp(); index++) {
382 if (stopped()) break;
383 Node* l = stack(index);
384 if (l->is_top()) continue; // nothing here
385 const Type *type = osr_block->stack_type_at(index);
386 set_stack(index, check_interpreter_type(l, type, bad_type_exit));
387 }
388
389 if (bad_type_exit->control()->req() > 1) {
390 // Build an uncommon trap here, if any inputs can be unexpected.
391 bad_type_exit->set_control(_gvn.transform( bad_type_exit->control() ));
392 record_for_igvn(bad_type_exit->control());
393 SafePointNode* types_are_good = map();
394 set_map(bad_type_exit);
395 // The unexpected type happens because a new edge is active
396 // in the CFG, which typeflow had previously ignored.
397 // E.g., Object x = coldAtFirst() && notReached()? "str": new Integer(123).
398 // This x will be typed as Integer if notReached is not yet linked.
399 // It could also happen due to a problem in ciTypeFlow analysis.
400 uncommon_trap(Deoptimization::Reason_constraint,
401 Deoptimization::Action_reinterpret);
402 set_map(types_are_good);
403 }
404 }
405
406 //------------------------------Parse------------------------------------------
407 // Main parser constructor.
408 Parse::Parse(JVMState* caller, ciMethod* parse_method, float expected_uses)
409 : _exits(caller)
410 {
411 // Init some variables
412 _caller = caller;
413 _method = parse_method;
414 _expected_uses = expected_uses;
415 _depth = 1 + (caller->has_method() ? caller->depth() : 0);
416 _wrote_final = false;
417 _wrote_volatile = false;
418 _wrote_stable = false;
419 _wrote_fields = false;
420 _alloc_with_final_or_stable = nullptr;
421 _block = nullptr;
422 _first_return = true;
423 _replaced_nodes_for_exceptions = false;
424 _new_idx = C->unique();
425 DEBUG_ONLY(_entry_bci = UnknownBci);
426 DEBUG_ONLY(_block_count = -1);
427 DEBUG_ONLY(_blocks = (Block*)-1);
428 #ifndef PRODUCT
429 if (PrintCompilation || PrintOpto) {
430 // Make sure I have an inline tree, so I can print messages about it.
431 InlineTree::find_subtree_from_root(C->ilt(), caller, parse_method);
432 }
433 _max_switch_depth = 0;
434 _est_switch_depth = 0;
435 #endif
436
437 if (parse_method->has_reserved_stack_access()) {
438 C->set_has_reserved_stack_access(true);
439 }
440
441 if (parse_method->is_synchronized() || parse_method->has_monitor_bytecodes()) {
442 C->set_has_monitors(true);
443 }
444
445 if (parse_method->is_scoped()) {
446 C->set_has_scoped_access(true);
447 }
448
449 _iter.reset_to_method(method());
450 C->set_has_loops(C->has_loops() || method()->has_loops());
451
452 if (_expected_uses <= 0) {
453 _prof_factor = 1;
454 } else {
455 float prof_total = parse_method->interpreter_invocation_count();
456 if (prof_total <= _expected_uses) {
457 _prof_factor = 1;
458 } else {
459 _prof_factor = _expected_uses / prof_total;
460 }
461 }
462
463 CompileLog* log = C->log();
464 if (log != nullptr) {
465 log->begin_head("parse method='%d' uses='%f'",
466 log->identify(parse_method), expected_uses);
467 if (depth() == 1 && C->is_osr_compilation()) {
468 log->print(" osr_bci='%d'", C->entry_bci());
469 }
470 log->stamp();
471 log->end_head();
472 }
473
474 // Accumulate deoptimization counts.
475 // (The range_check and store_check counts are checked elsewhere.)
476 ciMethodData* md = method()->method_data();
477 for (uint reason = 0; reason < md->trap_reason_limit(); reason++) {
478 uint md_count = md->trap_count(reason);
479 if (md_count != 0) {
480 if (md_count >= md->trap_count_limit()) {
481 md_count = md->trap_count_limit() + md->overflow_trap_count();
482 }
483 uint total_count = C->trap_count(reason);
484 uint old_count = total_count;
485 total_count += md_count;
486 // Saturate the add if it overflows.
487 if (total_count < old_count || total_count < md_count)
488 total_count = (uint)-1;
489 C->set_trap_count(reason, total_count);
490 if (log != nullptr)
491 log->elem("observe trap='%s' count='%d' total='%d'",
492 Deoptimization::trap_reason_name(reason),
493 md_count, total_count);
494 }
495 }
496 // Accumulate total sum of decompilations, also.
497 C->set_decompile_count(C->decompile_count() + md->decompile_count());
498
499 if (log != nullptr && method()->has_exception_handlers()) {
500 log->elem("observe that='has_exception_handlers'");
501 }
502
503 assert(InlineTree::check_can_parse(method()) == nullptr, "Can not parse this method, cutout earlier");
504 assert(method()->has_balanced_monitors(), "Can not parse unbalanced monitors, cutout earlier");
505
506 // Always register dependence if JVMTI is enabled, because
507 // either breakpoint setting or hotswapping of methods may
508 // cause deoptimization.
509 if (C->env()->jvmti_can_hotswap_or_post_breakpoint()) {
510 C->dependencies()->assert_evol_method(method());
511 }
512
513 NOT_PRODUCT(methods_seen++);
514
515 // Do some special top-level things.
516 if (depth() == 1 && C->is_osr_compilation()) {
517 _tf = C->tf(); // the OSR entry type is different
518 _entry_bci = C->entry_bci();
519 _flow = method()->get_osr_flow_analysis(osr_bci());
520 } else {
521 _tf = TypeFunc::make(method());
522 _entry_bci = InvocationEntryBci;
523 _flow = method()->get_flow_analysis();
524 }
525
526 if (_flow->failing()) {
527 // TODO Adding a trap due to an unloaded return type in ciTypeFlow::StateVector::do_invoke
528 // can lead to this. Re-enable once 8284443 is fixed.
529 //assert(false, "type flow analysis failed during parsing");
530 C->record_method_not_compilable(_flow->failure_reason());
531 #ifndef PRODUCT
532 if (PrintOpto && (Verbose || WizardMode)) {
533 if (is_osr_parse()) {
534 tty->print_cr("OSR @%d type flow bailout: %s", _entry_bci, _flow->failure_reason());
535 } else {
536 tty->print_cr("type flow bailout: %s", _flow->failure_reason());
537 }
538 if (Verbose) {
539 method()->print();
540 method()->print_codes();
541 _flow->print();
542 }
543 }
544 #endif
545 }
546
547 #ifdef ASSERT
548 if (depth() == 1) {
549 assert(C->is_osr_compilation() == this->is_osr_parse(), "OSR in sync");
550 } else {
551 assert(!this->is_osr_parse(), "no recursive OSR");
552 }
553 #endif
554
555 #ifndef PRODUCT
556 if (_flow->has_irreducible_entry()) {
557 C->set_parsed_irreducible_loop(true);
558 }
559
560 methods_parsed++;
561 // add method size here to guarantee that inlined methods are added too
562 if (CITime)
563 _total_bytes_compiled += method()->code_size();
564
565 show_parse_info();
566 #endif
567
568 if (failing()) {
569 if (log) log->done("parse");
570 return;
571 }
572
573 gvn().transform(top());
574
575 // Import the results of the ciTypeFlow.
576 init_blocks();
577
578 // Merge point for all normal exits
579 build_exits();
580
581 // Setup the initial JVM state map.
582 SafePointNode* entry_map = create_entry_map();
583
584 // Check for bailouts during map initialization
585 if (failing() || entry_map == nullptr) {
586 if (log) log->done("parse");
587 return;
588 }
589
590 Node_Notes* caller_nn = C->default_node_notes();
591 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls.
592 if (DebugInlinedCalls || depth() == 1) {
593 C->set_default_node_notes(make_node_notes(caller_nn));
594 }
595
596 if (is_osr_parse()) {
597 Node* osr_buf = entry_map->in(TypeFunc::Parms+0);
598 entry_map->set_req(TypeFunc::Parms+0, top());
599 set_map(entry_map);
600 load_interpreter_state(osr_buf);
601 } else {
602 set_map(entry_map);
603 do_method_entry();
604 }
605
606 if (depth() == 1 && !failing()) {
607 if (C->clinit_barrier_on_entry()) {
608 // Add check to deoptimize the nmethod once the holder class is fully initialized
609 clinit_deopt();
610 }
611 }
612
613 // Check for bailouts during method entry.
614 if (failing()) {
615 if (log) log->done("parse");
616 C->set_default_node_notes(caller_nn);
617 return;
618 }
619
620 // Handle inline type arguments
621 int arg_size = method()->arg_size();
622 for (int i = 0; i < arg_size; i++) {
623 Node* parm = local(i);
624 const Type* t = _gvn.type(parm);
625 if (t->is_inlinetypeptr()) {
626 // Create InlineTypeNode from the oop and replace the parameter
627 bool is_larval = (i == 0) && method()->is_object_constructor() && !method()->holder()->is_java_lang_Object();
628 Node* vt = InlineTypeNode::make_from_oop(this, parm, t->inline_klass(), !t->maybe_null(), is_larval);
629 replace_in_map(parm, vt);
630 } else if (UseTypeSpeculation && (i == (arg_size - 1)) && !is_osr_parse() && method()->has_vararg() &&
631 t->isa_aryptr() != nullptr && !t->is_aryptr()->is_null_free() && !t->is_aryptr()->is_not_null_free()) {
632 // Speculate on varargs Object array being not null-free (and therefore also not flat)
633 const TypePtr* spec_type = t->speculative();
634 spec_type = (spec_type != nullptr && spec_type->isa_aryptr() != nullptr) ? spec_type : t->is_aryptr();
635 spec_type = spec_type->remove_speculative()->is_aryptr()->cast_to_not_null_free();
636 spec_type = TypeOopPtr::make(TypePtr::BotPTR, Type::Offset::bottom, TypeOopPtr::InstanceBot, spec_type);
637 Node* cast = _gvn.transform(new CheckCastPPNode(control(), parm, t->join_speculative(spec_type)));
638 replace_in_map(parm, cast);
639 }
640 }
641
642 entry_map = map(); // capture any changes performed by method setup code
643 assert(jvms()->endoff() == map()->req(), "map matches JVMS layout");
644
645 // We begin parsing as if we have just encountered a jump to the
646 // method entry.
647 Block* entry_block = start_block();
648 assert(entry_block->start() == (is_osr_parse() ? osr_bci() : 0), "");
649 set_map_clone(entry_map);
650 merge_common(entry_block, entry_block->next_path_num());
651
652 #ifndef PRODUCT
653 BytecodeParseHistogram *parse_histogram_obj = new (C->env()->arena()) BytecodeParseHistogram(this, C);
654 set_parse_histogram( parse_histogram_obj );
655 #endif
656
657 // Parse all the basic blocks.
658 do_all_blocks();
659
660 // Check for bailouts during conversion to graph
661 if (failing()) {
662 if (log) log->done("parse");
663 return;
664 }
665
666 // Fix up all exiting control flow.
667 set_map(entry_map);
668 do_exits();
669
670 // Only reset this now, to make sure that debug information emitted
671 // for exiting control flow still refers to the inlined method.
672 C->set_default_node_notes(caller_nn);
673
674 if (log) log->done("parse nodes='%d' live='%d' memory='" SIZE_FORMAT "'",
675 C->unique(), C->live_nodes(), C->node_arena()->used());
676 }
677
678 //---------------------------do_all_blocks-------------------------------------
679 void Parse::do_all_blocks() {
680 bool has_irreducible = flow()->has_irreducible_entry();
681
682 // Walk over all blocks in Reverse Post-Order.
683 while (true) {
684 bool progress = false;
685 for (int rpo = 0; rpo < block_count(); rpo++) {
686 Block* block = rpo_at(rpo);
687
688 if (block->is_parsed()) continue;
689
690 if (!block->is_merged()) {
691 // Dead block, no state reaches this block
692 continue;
693 }
694
695 // Prepare to parse this block.
696 load_state_from(block);
697
698 if (stopped()) {
699 // Block is dead.
700 continue;
701 }
702
703 NOT_PRODUCT(blocks_parsed++);
704
705 progress = true;
706 if (block->is_loop_head() || block->is_handler() || (has_irreducible && !block->is_ready())) {
707 // Not all preds have been parsed. We must build phis everywhere.
708 // (Note that dead locals do not get phis built, ever.)
709 ensure_phis_everywhere();
710
711 if (block->is_SEL_head()) {
712 // Add predicate to single entry (not irreducible) loop head.
713 assert(!block->has_merged_backedge(), "only entry paths should be merged for now");
714 // Predicates may have been added after a dominating if
715 if (!block->has_predicates()) {
716 // Need correct bci for predicate.
717 // It is fine to set it here since do_one_block() will set it anyway.
718 set_parse_bci(block->start());
719 add_parse_predicates();
720 }
721 // Add new region for back branches.
722 int edges = block->pred_count() - block->preds_parsed() + 1; // +1 for original region
723 RegionNode *r = new RegionNode(edges+1);
724 _gvn.set_type(r, Type::CONTROL);
725 record_for_igvn(r);
726 r->init_req(edges, control());
727 set_control(r);
728 block->copy_irreducible_status_to(r, jvms());
729 // Add new phis.
730 ensure_phis_everywhere();
731 }
732
733 // Leave behind an undisturbed copy of the map, for future merges.
734 set_map(clone_map());
735 }
736
737 if (control()->is_Region() && !block->is_loop_head() && !has_irreducible && !block->is_handler()) {
738 // In the absence of irreducible loops, the Region and Phis
739 // associated with a merge that doesn't involve a backedge can
740 // be simplified now since the RPO parsing order guarantees
741 // that any path which was supposed to reach here has already
742 // been parsed or must be dead.
743 Node* c = control();
744 Node* result = _gvn.transform(control());
745 if (c != result && TraceOptoParse) {
746 tty->print_cr("Block #%d replace %d with %d", block->rpo(), c->_idx, result->_idx);
747 }
748 if (result != top()) {
749 record_for_igvn(result);
750 }
751 }
752
753 // Parse the block.
754 do_one_block();
755
756 // Check for bailouts.
757 if (failing()) return;
758 }
759
760 // with irreducible loops multiple passes might be necessary to parse everything
761 if (!has_irreducible || !progress) {
762 break;
763 }
764 }
765
766 #ifndef PRODUCT
767 blocks_seen += block_count();
768
769 // Make sure there are no half-processed blocks remaining.
770 // Every remaining unprocessed block is dead and may be ignored now.
771 for (int rpo = 0; rpo < block_count(); rpo++) {
772 Block* block = rpo_at(rpo);
773 if (!block->is_parsed()) {
774 if (TraceOptoParse) {
775 tty->print_cr("Skipped dead block %d at bci:%d", rpo, block->start());
776 }
777 assert(!block->is_merged(), "no half-processed blocks");
778 }
779 }
780 #endif
781 }
782
783 static Node* mask_int_value(Node* v, BasicType bt, PhaseGVN* gvn) {
784 switch (bt) {
785 case T_BYTE:
786 v = gvn->transform(new LShiftINode(v, gvn->intcon(24)));
787 v = gvn->transform(new RShiftINode(v, gvn->intcon(24)));
788 break;
789 case T_SHORT:
790 v = gvn->transform(new LShiftINode(v, gvn->intcon(16)));
791 v = gvn->transform(new RShiftINode(v, gvn->intcon(16)));
792 break;
793 case T_CHAR:
794 v = gvn->transform(new AndINode(v, gvn->intcon(0xFFFF)));
795 break;
796 case T_BOOLEAN:
797 v = gvn->transform(new AndINode(v, gvn->intcon(0x1)));
798 break;
799 default:
800 break;
801 }
802 return v;
803 }
804
805 //-------------------------------build_exits----------------------------------
806 // Build normal and exceptional exit merge points.
807 void Parse::build_exits() {
808 // make a clone of caller to prevent sharing of side-effects
809 _exits.set_map(_exits.clone_map());
810 _exits.clean_stack(_exits.sp());
811 _exits.sync_jvms();
812
813 RegionNode* region = new RegionNode(1);
814 record_for_igvn(region);
815 gvn().set_type_bottom(region);
816 _exits.set_control(region);
817
818 // Note: iophi and memphi are not transformed until do_exits.
819 Node* iophi = new PhiNode(region, Type::ABIO);
820 Node* memphi = new PhiNode(region, Type::MEMORY, TypePtr::BOTTOM);
821 gvn().set_type_bottom(iophi);
822 gvn().set_type_bottom(memphi);
823 _exits.set_i_o(iophi);
824 _exits.set_all_memory(memphi);
825
826 // Add a return value to the exit state. (Do not push it yet.)
827 if (tf()->range_sig()->cnt() > TypeFunc::Parms) {
828 const Type* ret_type = tf()->range_sig()->field_at(TypeFunc::Parms);
829 if (ret_type->isa_int()) {
830 BasicType ret_bt = method()->return_type()->basic_type();
831 if (ret_bt == T_BOOLEAN ||
832 ret_bt == T_CHAR ||
833 ret_bt == T_BYTE ||
834 ret_bt == T_SHORT) {
835 ret_type = TypeInt::INT;
836 }
837 }
838
839 // Don't "bind" an unloaded return klass to the ret_phi. If the klass
840 // becomes loaded during the subsequent parsing, the loaded and unloaded
841 // types will not join when we transform and push in do_exits().
842 const TypeOopPtr* ret_oop_type = ret_type->isa_oopptr();
843 if (ret_oop_type && !ret_oop_type->is_loaded()) {
844 ret_type = TypeOopPtr::BOTTOM;
845 }
846 int ret_size = type2size[ret_type->basic_type()];
847 Node* ret_phi = new PhiNode(region, ret_type);
848 gvn().set_type_bottom(ret_phi);
849 _exits.ensure_stack(ret_size);
850 assert((int)(tf()->range_sig()->cnt() - TypeFunc::Parms) == ret_size, "good tf range");
851 assert(method()->return_type()->size() == ret_size, "tf agrees w/ method");
852 _exits.set_argument(0, ret_phi); // here is where the parser finds it
853 // Note: ret_phi is not yet pushed, until do_exits.
854 }
855 }
856
857 //----------------------------build_start_state-------------------------------
858 // Construct a state which contains only the incoming arguments from an
859 // unknown caller. The method & bci will be null & InvocationEntryBci.
860 JVMState* Compile::build_start_state(StartNode* start, const TypeFunc* tf) {
861 int arg_size = tf->domain_sig()->cnt();
862 int max_size = MAX2(arg_size, (int)tf->range_cc()->cnt());
863 JVMState* jvms = new (this) JVMState(max_size - TypeFunc::Parms);
864 SafePointNode* map = new SafePointNode(max_size, jvms);
865 jvms->set_map(map);
866 record_for_igvn(map);
867 assert(arg_size == TypeFunc::Parms + (is_osr_compilation() ? 1 : method()->arg_size()), "correct arg_size");
868 Node_Notes* old_nn = default_node_notes();
869 if (old_nn != nullptr && has_method()) {
870 Node_Notes* entry_nn = old_nn->clone(this);
871 JVMState* entry_jvms = new(this) JVMState(method(), old_nn->jvms());
872 entry_jvms->set_offsets(0);
873 entry_jvms->set_bci(entry_bci());
874 entry_nn->set_jvms(entry_jvms);
875 set_default_node_notes(entry_nn);
876 }
877 PhaseGVN& gvn = *initial_gvn();
878 uint i = 0;
879 int arg_num = 0;
880 for (uint j = 0; i < (uint)arg_size; i++) {
881 const Type* t = tf->domain_sig()->field_at(i);
882 Node* parm = nullptr;
883 if (t->is_inlinetypeptr() && method()->is_scalarized_arg(arg_num)) {
884 // Inline type arguments are not passed by reference: we get an argument per
885 // field of the inline type. Build InlineTypeNodes from the inline type arguments.
886 GraphKit kit(jvms, &gvn);
887 kit.set_control(map->control());
888 Node* old_mem = map->memory();
889 // Use immutable memory for inline type loads and restore it below
890 kit.set_all_memory(C->immutable_memory());
891 parm = InlineTypeNode::make_from_multi(&kit, start, t->inline_klass(), j, /* in= */ true, /* null_free= */ !t->maybe_null());
892 map->set_control(kit.control());
893 map->set_memory(old_mem);
894 } else {
895 parm = gvn.transform(new ParmNode(start, j++));
896 }
897 map->init_req(i, parm);
898 // Record all these guys for later GVN.
899 record_for_igvn(parm);
900 if (i >= TypeFunc::Parms && t != Type::HALF) {
901 arg_num++;
902 }
903 }
904 for (; i < map->req(); i++) {
905 map->init_req(i, top());
906 }
907 assert(jvms->argoff() == TypeFunc::Parms, "parser gets arguments here");
908 set_default_node_notes(old_nn);
909 return jvms;
910 }
911
912 //-----------------------------make_node_notes---------------------------------
913 Node_Notes* Parse::make_node_notes(Node_Notes* caller_nn) {
914 if (caller_nn == nullptr) return nullptr;
915 Node_Notes* nn = caller_nn->clone(C);
916 JVMState* caller_jvms = nn->jvms();
917 JVMState* jvms = new (C) JVMState(method(), caller_jvms);
918 jvms->set_offsets(0);
919 jvms->set_bci(_entry_bci);
920 nn->set_jvms(jvms);
921 return nn;
922 }
923
924
925 //--------------------------return_values--------------------------------------
926 void Compile::return_values(JVMState* jvms) {
927 GraphKit kit(jvms);
928 Node* ret = new ReturnNode(TypeFunc::Parms,
929 kit.control(),
930 kit.i_o(),
931 kit.reset_memory(),
932 kit.frameptr(),
933 kit.returnadr());
934 // Add zero or 1 return values
935 int ret_size = tf()->range_sig()->cnt() - TypeFunc::Parms;
936 if (ret_size > 0) {
937 kit.inc_sp(-ret_size); // pop the return value(s)
938 kit.sync_jvms();
939 Node* res = kit.argument(0);
940 if (tf()->returns_inline_type_as_fields()) {
941 // Multiple return values (inline type fields): add as many edges
942 // to the Return node as returned values.
943 InlineTypeNode* vt = res->as_InlineType();
944 ret->add_req_batch(nullptr, tf()->range_cc()->cnt() - TypeFunc::Parms);
945 if (vt->is_allocated(&kit.gvn()) && !StressCallingConvention) {
946 ret->init_req(TypeFunc::Parms, vt);
947 } else {
948 // Return the tagged klass pointer to signal scalarization to the caller
949 Node* tagged_klass = vt->tagged_klass(kit.gvn());
950 // Return null if the inline type is null (IsInit field is not set)
951 Node* conv = kit.gvn().transform(new ConvI2LNode(vt->get_is_init()));
952 Node* shl = kit.gvn().transform(new LShiftLNode(conv, kit.intcon(63)));
953 Node* shr = kit.gvn().transform(new RShiftLNode(shl, kit.intcon(63)));
954 tagged_klass = kit.gvn().transform(new AndLNode(tagged_klass, shr));
955 ret->init_req(TypeFunc::Parms, tagged_klass);
956 }
957 uint idx = TypeFunc::Parms + 1;
958 vt->pass_fields(&kit, ret, idx, false, false);
959 } else {
960 ret->add_req(res);
961 // Note: The second dummy edge is not needed by a ReturnNode.
962 }
963 }
964 // bind it to root
965 root()->add_req(ret);
966 record_for_igvn(ret);
967 initial_gvn()->transform(ret);
968 }
969
970 //------------------------rethrow_exceptions-----------------------------------
971 // Bind all exception states in the list into a single RethrowNode.
972 void Compile::rethrow_exceptions(JVMState* jvms) {
973 GraphKit kit(jvms);
974 if (!kit.has_exceptions()) return; // nothing to generate
975 // Load my combined exception state into the kit, with all phis transformed:
976 SafePointNode* ex_map = kit.combine_and_pop_all_exception_states();
977 Node* ex_oop = kit.use_exception_state(ex_map);
978 RethrowNode* exit = new RethrowNode(kit.control(),
979 kit.i_o(), kit.reset_memory(),
980 kit.frameptr(), kit.returnadr(),
981 // like a return but with exception input
982 ex_oop);
983 // bind to root
984 root()->add_req(exit);
985 record_for_igvn(exit);
986 initial_gvn()->transform(exit);
987 }
988
989 //---------------------------do_exceptions-------------------------------------
990 // Process exceptions arising from the current bytecode.
991 // Send caught exceptions to the proper handler within this method.
992 // Unhandled exceptions feed into _exit.
993 void Parse::do_exceptions() {
994 if (!has_exceptions()) return;
995
996 if (failing()) {
997 // Pop them all off and throw them away.
998 while (pop_exception_state() != nullptr) ;
999 return;
1000 }
1001
1002 PreserveJVMState pjvms(this, false);
1003
1004 SafePointNode* ex_map;
1005 while ((ex_map = pop_exception_state()) != nullptr) {
1006 if (!method()->has_exception_handlers()) {
1007 // Common case: Transfer control outward.
1008 // Doing it this early allows the exceptions to common up
1009 // even between adjacent method calls.
1010 throw_to_exit(ex_map);
1011 } else {
1012 // Have to look at the exception first.
1013 assert(stopped(), "catch_inline_exceptions trashes the map");
1014 catch_inline_exceptions(ex_map);
1015 stop_and_kill_map(); // we used up this exception state; kill it
1016 }
1017 }
1018
1019 // We now return to our regularly scheduled program:
1020 }
1021
1022 //---------------------------throw_to_exit-------------------------------------
1023 // Merge the given map into an exception exit from this method.
1024 // The exception exit will handle any unlocking of receiver.
1025 // The ex_oop must be saved within the ex_map, unlike merge_exception.
1026 void Parse::throw_to_exit(SafePointNode* ex_map) {
1027 // Pop the JVMS to (a copy of) the caller.
1028 GraphKit caller;
1029 caller.set_map_clone(_caller->map());
1030 caller.set_bci(_caller->bci());
1031 caller.set_sp(_caller->sp());
1032 // Copy out the standard machine state:
1033 for (uint i = 0; i < TypeFunc::Parms; i++) {
1034 caller.map()->set_req(i, ex_map->in(i));
1035 }
1036 if (ex_map->has_replaced_nodes()) {
1037 _replaced_nodes_for_exceptions = true;
1038 }
1039 caller.map()->transfer_replaced_nodes_from(ex_map, _new_idx);
1040 // ...and the exception:
1041 Node* ex_oop = saved_ex_oop(ex_map);
1042 SafePointNode* caller_ex_map = caller.make_exception_state(ex_oop);
1043 // Finally, collect the new exception state in my exits:
1044 _exits.add_exception_state(caller_ex_map);
1045 }
1046
1047 //------------------------------do_exits---------------------------------------
1048 void Parse::do_exits() {
1049 set_parse_bci(InvocationEntryBci);
1050
1051 // Now peephole on the return bits
1052 Node* region = _exits.control();
1053 _exits.set_control(gvn().transform(region));
1054
1055 Node* iophi = _exits.i_o();
1056 _exits.set_i_o(gvn().transform(iophi));
1057
1058 // Figure out if we need to emit the trailing barrier. The barrier is only
1059 // needed in the constructors, and only in three cases:
1060 //
1061 // 1. The constructor wrote a final or a @Stable field. All these
1062 // initializations must be ordered before any code after the constructor
1063 // publishes the reference to the newly constructed object. Rather
1064 // than wait for the publication, we simply block the writes here.
1065 // Rather than put a barrier on only those writes which are required
1066 // to complete, we force all writes to complete.
1067 //
1068 // 2. Experimental VM option is used to force the barrier if any field
1069 // was written out in the constructor.
1070 //
1071 // 3. On processors which are not CPU_MULTI_COPY_ATOMIC (e.g. PPC64),
1072 // support_IRIW_for_not_multiple_copy_atomic_cpu selects that
1073 // MemBarVolatile is used before volatile load instead of after volatile
1074 // store, so there's no barrier after the store.
1075 // We want to guarantee the same behavior as on platforms with total store
1076 // order, although this is not required by the Java memory model.
1077 // In this case, we want to enforce visibility of volatile field
1078 // initializations which are performed in constructors.
1079 // So as with finals, we add a barrier here.
1080 //
1081 // "All bets are off" unless the first publication occurs after a
1082 // normal return from the constructor. We do not attempt to detect
1083 // such unusual early publications. But no barrier is needed on
1084 // exceptional returns, since they cannot publish normally.
1085 //
1086 if ((method()->is_object_constructor() || method()->is_class_initializer()) &&
1087 (wrote_final() || wrote_stable() ||
1088 (AlwaysSafeConstructors && wrote_fields()) ||
1089 (support_IRIW_for_not_multiple_copy_atomic_cpu && wrote_volatile()))) {
1090 Node* recorded_alloc = alloc_with_final_or_stable();
1091 _exits.insert_mem_bar(UseStoreStoreForCtor ? Op_MemBarStoreStore : Op_MemBarRelease,
1092 recorded_alloc);
1093
1094 // If Memory barrier is created for final fields write
1095 // and allocation node does not escape the initialize method,
1096 // then barrier introduced by allocation node can be removed.
1097 if (DoEscapeAnalysis && (recorded_alloc != nullptr)) {
1098 AllocateNode* alloc = AllocateNode::Ideal_allocation(recorded_alloc);
1099 alloc->compute_MemBar_redundancy(method());
1100 }
1101 if (PrintOpto && (Verbose || WizardMode)) {
1102 method()->print_name();
1103 tty->print_cr(" writes finals/@Stable and needs a memory barrier");
1104 }
1105 }
1106
1107 for (MergeMemStream mms(_exits.merged_memory()); mms.next_non_empty(); ) {
1108 // transform each slice of the original memphi:
1109 mms.set_memory(_gvn.transform(mms.memory()));
1110 }
1111 // Clean up input MergeMems created by transforming the slices
1112 _gvn.transform(_exits.merged_memory());
1113
1114 if (tf()->range_sig()->cnt() > TypeFunc::Parms) {
1115 const Type* ret_type = tf()->range_sig()->field_at(TypeFunc::Parms);
1116 Node* ret_phi = _gvn.transform( _exits.argument(0) );
1117 if (!_exits.control()->is_top() && _gvn.type(ret_phi)->empty()) {
1118 // If the type we set for the ret_phi in build_exits() is too optimistic and
1119 // the ret_phi is top now, there's an extremely small chance that it may be due to class
1120 // loading. It could also be due to an error, so mark this method as not compilable because
1121 // otherwise this could lead to an infinite compile loop.
1122 // In any case, this code path is rarely (and never in my testing) reached.
1123 C->record_method_not_compilable("Can't determine return type.");
1124 return;
1125 }
1126 if (ret_type->isa_int()) {
1127 BasicType ret_bt = method()->return_type()->basic_type();
1128 ret_phi = mask_int_value(ret_phi, ret_bt, &_gvn);
1129 }
1130 _exits.push_node(ret_type->basic_type(), ret_phi);
1131 }
1132
1133 // Note: Logic for creating and optimizing the ReturnNode is in Compile.
1134
1135 // Unlock along the exceptional paths.
1136 // This is done late so that we can common up equivalent exceptions
1137 // (e.g., null checks) arising from multiple points within this method.
1138 // See GraphKit::add_exception_state, which performs the commoning.
1139 bool do_synch = method()->is_synchronized() && GenerateSynchronizationCode;
1140
1141 // record exit from a method if compiled while Dtrace is turned on.
1142 if (do_synch || C->env()->dtrace_method_probes() || _replaced_nodes_for_exceptions) {
1143 // First move the exception list out of _exits:
1144 GraphKit kit(_exits.transfer_exceptions_into_jvms());
1145 SafePointNode* normal_map = kit.map(); // keep this guy safe
1146 // Now re-collect the exceptions into _exits:
1147 SafePointNode* ex_map;
1148 while ((ex_map = kit.pop_exception_state()) != nullptr) {
1149 Node* ex_oop = kit.use_exception_state(ex_map);
1150 // Force the exiting JVM state to have this method at InvocationEntryBci.
1151 // The exiting JVM state is otherwise a copy of the calling JVMS.
1152 JVMState* caller = kit.jvms();
1153 JVMState* ex_jvms = caller->clone_shallow(C);
1154 ex_jvms->bind_map(kit.clone_map());
1155 ex_jvms->set_bci( InvocationEntryBci);
1156 kit.set_jvms(ex_jvms);
1157 if (do_synch) {
1158 // Add on the synchronized-method box/object combo
1159 kit.map()->push_monitor(_synch_lock);
1160 // Unlock!
1161 kit.shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node());
1162 }
1163 if (C->env()->dtrace_method_probes()) {
1164 kit.make_dtrace_method_exit(method());
1165 }
1166 if (_replaced_nodes_for_exceptions) {
1167 kit.map()->apply_replaced_nodes(_new_idx);
1168 }
1169 // Done with exception-path processing.
1170 ex_map = kit.make_exception_state(ex_oop);
1171 assert(ex_jvms->same_calls_as(ex_map->jvms()), "sanity");
1172 // Pop the last vestige of this method:
1173 caller->clone_shallow(C)->bind_map(ex_map);
1174 _exits.push_exception_state(ex_map);
1175 }
1176 assert(_exits.map() == normal_map, "keep the same return state");
1177 }
1178
1179 {
1180 // Capture very early exceptions (receiver null checks) from caller JVMS
1181 GraphKit caller(_caller);
1182 SafePointNode* ex_map;
1183 while ((ex_map = caller.pop_exception_state()) != nullptr) {
1184 _exits.add_exception_state(ex_map);
1185 }
1186 }
1187 _exits.map()->apply_replaced_nodes(_new_idx);
1188 }
1189
1190 //-----------------------------create_entry_map-------------------------------
1191 // Initialize our parser map to contain the types at method entry.
1192 // For OSR, the map contains a single RawPtr parameter.
1193 // Initial monitor locking for sync. methods is performed by do_method_entry.
1194 SafePointNode* Parse::create_entry_map() {
1195 // Check for really stupid bail-out cases.
1196 uint len = TypeFunc::Parms + method()->max_locals() + method()->max_stack();
1197 if (len >= 32760) {
1198 // Bailout expected, this is a very rare edge case.
1199 C->record_method_not_compilable("too many local variables");
1200 return nullptr;
1201 }
1202
1203 // clear current replaced nodes that are of no use from here on (map was cloned in build_exits).
1204 _caller->map()->delete_replaced_nodes();
1205
1206 // If this is an inlined method, we may have to do a receiver null check.
1207 if (_caller->has_method() && is_normal_parse() && !method()->is_static()) {
1208 GraphKit kit(_caller);
1209 Node* receiver = kit.argument(0);
1210 Node* null_free = kit.null_check_receiver_before_call(method());
1211 _caller = kit.transfer_exceptions_into_jvms();
1212 if (receiver->is_InlineType() && receiver->as_InlineType()->is_larval()) {
1213 // Replace the larval inline type receiver in the exit map as well to make sure that
1214 // we can find and update it in Parse::do_call when we are done with the initialization.
1215 _exits.map()->replace_edge(receiver, null_free);
1216 }
1217 if (kit.stopped()) {
1218 _exits.add_exception_states_from(_caller);
1219 _exits.set_jvms(_caller);
1220 return nullptr;
1221 }
1222 }
1223
1224 assert(method() != nullptr, "parser must have a method");
1225
1226 // Create an initial safepoint to hold JVM state during parsing
1227 JVMState* jvms = new (C) JVMState(method(), _caller->has_method() ? _caller : nullptr);
1228 set_map(new SafePointNode(len, jvms));
1229 jvms->set_map(map());
1230 record_for_igvn(map());
1231 assert(jvms->endoff() == len, "correct jvms sizing");
1232
1233 SafePointNode* inmap = _caller->map();
1234 assert(inmap != nullptr, "must have inmap");
1235 // In case of null check on receiver above
1236 map()->transfer_replaced_nodes_from(inmap, _new_idx);
1237
1238 uint i;
1239
1240 // Pass thru the predefined input parameters.
1241 for (i = 0; i < TypeFunc::Parms; i++) {
1242 map()->init_req(i, inmap->in(i));
1243 }
1244
1245 if (depth() == 1) {
1246 assert(map()->memory()->Opcode() == Op_Parm, "");
1247 // Insert the memory aliasing node
1248 set_all_memory(reset_memory());
1249 }
1250 assert(merged_memory(), "");
1251
1252 // Now add the locals which are initially bound to arguments:
1253 uint arg_size = tf()->domain_sig()->cnt();
1254 ensure_stack(arg_size - TypeFunc::Parms); // OSR methods have funny args
1255 for (i = TypeFunc::Parms; i < arg_size; i++) {
1256 map()->init_req(i, inmap->argument(_caller, i - TypeFunc::Parms));
1257 }
1258
1259 // Clear out the rest of the map (locals and stack)
1260 for (i = arg_size; i < len; i++) {
1261 map()->init_req(i, top());
1262 }
1263
1264 SafePointNode* entry_map = stop();
1265 return entry_map;
1266 }
1267
1268 //-----------------------------do_method_entry--------------------------------
1269 // Emit any code needed in the pseudo-block before BCI zero.
1270 // The main thing to do is lock the receiver of a synchronized method.
1271 void Parse::do_method_entry() {
1272 set_parse_bci(InvocationEntryBci); // Pseudo-BCP
1273 set_sp(0); // Java Stack Pointer
1274
1275 NOT_PRODUCT( count_compiled_calls(true/*at_method_entry*/, false/*is_inline*/); )
1276
1277 if (C->env()->dtrace_method_probes()) {
1278 make_dtrace_method_entry(method());
1279 }
1280
1281 #ifdef ASSERT
1282 // Narrow receiver type when it is too broad for the method being parsed.
1283 if (!method()->is_static()) {
1284 ciInstanceKlass* callee_holder = method()->holder();
1285 const Type* holder_type = TypeInstPtr::make(TypePtr::BotPTR, callee_holder, Type::trust_interfaces);
1286
1287 Node* receiver_obj = local(0);
1288 const TypeInstPtr* receiver_type = _gvn.type(receiver_obj)->isa_instptr();
1289
1290 if (receiver_type != nullptr && !receiver_type->higher_equal(holder_type)) {
1291 // Receiver should always be a subtype of callee holder.
1292 // But, since C2 type system doesn't properly track interfaces,
1293 // the invariant can't be expressed in the type system for default methods.
1294 // Example: for unrelated C <: I and D <: I, (C `meet` D) = Object </: I.
1295 assert(callee_holder->is_interface(), "missing subtype check");
1296
1297 // Perform dynamic receiver subtype check against callee holder class w/ a halt on failure.
1298 Node* holder_klass = _gvn.makecon(TypeKlassPtr::make(callee_holder, Type::trust_interfaces));
1299 Node* not_subtype_ctrl = gen_subtype_check(receiver_obj, holder_klass);
1300 assert(!stopped(), "not a subtype");
1301
1302 Node* halt = _gvn.transform(new HaltNode(not_subtype_ctrl, frameptr(), "failed receiver subtype check"));
1303 C->root()->add_req(halt);
1304 }
1305 }
1306 #endif // ASSERT
1307
1308 // If the method is synchronized, we need to construct a lock node, attach
1309 // it to the Start node, and pin it there.
1310 if (method()->is_synchronized()) {
1311 // Insert a FastLockNode right after the Start which takes as arguments
1312 // the current thread pointer, the "this" pointer & the address of the
1313 // stack slot pair used for the lock. The "this" pointer is a projection
1314 // off the start node, but the locking spot has to be constructed by
1315 // creating a ConLNode of 0, and boxing it with a BoxLockNode. The BoxLockNode
1316 // becomes the second argument to the FastLockNode call. The
1317 // FastLockNode becomes the new control parent to pin it to the start.
1318
1319 // Setup Object Pointer
1320 Node *lock_obj = nullptr;
1321 if (method()->is_static()) {
1322 ciInstance* mirror = _method->holder()->java_mirror();
1323 const TypeInstPtr *t_lock = TypeInstPtr::make(mirror);
1324 lock_obj = makecon(t_lock);
1325 } else { // Else pass the "this" pointer,
1326 lock_obj = local(0); // which is Parm0 from StartNode
1327 assert(!_gvn.type(lock_obj)->make_oopptr()->can_be_inline_type(), "can't be an inline type");
1328 }
1329 // Clear out dead values from the debug info.
1330 kill_dead_locals();
1331 // Build the FastLockNode
1332 _synch_lock = shared_lock(lock_obj);
1333 // Check for bailout in shared_lock
1334 if (failing()) { return; }
1335 }
1336
1337 // Feed profiling data for parameters to the type system so it can
1338 // propagate it as speculative types
1339 record_profiled_parameters_for_speculation();
1340 }
1341
1342 //------------------------------init_blocks------------------------------------
1343 // Initialize our parser map to contain the types/monitors at method entry.
1344 void Parse::init_blocks() {
1345 // Create the blocks.
1346 _block_count = flow()->block_count();
1347 _blocks = NEW_RESOURCE_ARRAY(Block, _block_count);
1348
1349 // Initialize the structs.
1350 for (int rpo = 0; rpo < block_count(); rpo++) {
1351 Block* block = rpo_at(rpo);
1352 new(block) Block(this, rpo);
1353 }
1354
1355 // Collect predecessor and successor information.
1356 for (int rpo = 0; rpo < block_count(); rpo++) {
1357 Block* block = rpo_at(rpo);
1358 block->init_graph(this);
1359 }
1360 }
1361
1362 //-------------------------------init_node-------------------------------------
1363 Parse::Block::Block(Parse* outer, int rpo) : _live_locals() {
1364 _flow = outer->flow()->rpo_at(rpo);
1365 _pred_count = 0;
1366 _preds_parsed = 0;
1367 _count = 0;
1368 _is_parsed = false;
1369 _is_handler = false;
1370 _has_merged_backedge = false;
1371 _start_map = nullptr;
1372 _has_predicates = false;
1373 _num_successors = 0;
1374 _all_successors = 0;
1375 _successors = nullptr;
1376 assert(pred_count() == 0 && preds_parsed() == 0, "sanity");
1377 assert(!(is_merged() || is_parsed() || is_handler() || has_merged_backedge()), "sanity");
1378 assert(_live_locals.size() == 0, "sanity");
1379
1380 // entry point has additional predecessor
1381 if (flow()->is_start()) _pred_count++;
1382 assert(flow()->is_start() == (this == outer->start_block()), "");
1383 }
1384
1385 //-------------------------------init_graph------------------------------------
1386 void Parse::Block::init_graph(Parse* outer) {
1387 // Create the successor list for this parser block.
1388 GrowableArray<ciTypeFlow::Block*>* tfs = flow()->successors();
1389 GrowableArray<ciTypeFlow::Block*>* tfe = flow()->exceptions();
1390 int ns = tfs->length();
1391 int ne = tfe->length();
1392 _num_successors = ns;
1393 _all_successors = ns+ne;
1394 _successors = (ns+ne == 0) ? nullptr : NEW_RESOURCE_ARRAY(Block*, ns+ne);
1395 int p = 0;
1396 for (int i = 0; i < ns+ne; i++) {
1397 ciTypeFlow::Block* tf2 = (i < ns) ? tfs->at(i) : tfe->at(i-ns);
1398 Block* block2 = outer->rpo_at(tf2->rpo());
1399 _successors[i] = block2;
1400
1401 // Accumulate pred info for the other block, too.
1402 // Note: We also need to set _pred_count for exception blocks since they could
1403 // also have normal predecessors (reached without athrow by an explicit jump).
1404 // This also means that next_path_num can be called along exception paths.
1405 block2->_pred_count++;
1406 if (i >= ns) {
1407 block2->_is_handler = true;
1408 }
1409
1410 #ifdef ASSERT
1411 // A block's successors must be distinguishable by BCI.
1412 // That is, no bytecode is allowed to branch to two different
1413 // clones of the same code location.
1414 for (int j = 0; j < i; j++) {
1415 Block* block1 = _successors[j];
1416 if (block1 == block2) continue; // duplicates are OK
1417 assert(block1->start() != block2->start(), "successors have unique bcis");
1418 }
1419 #endif
1420 }
1421 }
1422
1423 //---------------------------successor_for_bci---------------------------------
1424 Parse::Block* Parse::Block::successor_for_bci(int bci) {
1425 for (int i = 0; i < all_successors(); i++) {
1426 Block* block2 = successor_at(i);
1427 if (block2->start() == bci) return block2;
1428 }
1429 // We can actually reach here if ciTypeFlow traps out a block
1430 // due to an unloaded class, and concurrently with compilation the
1431 // class is then loaded, so that a later phase of the parser is
1432 // able to see more of the bytecode CFG. Or, the flow pass and
1433 // the parser can have a minor difference of opinion about executability
1434 // of bytecodes. For example, "obj.field = null" is executable even
1435 // if the field's type is an unloaded class; the flow pass used to
1436 // make a trap for such code.
1437 return nullptr;
1438 }
1439
1440
1441 //-----------------------------stack_type_at-----------------------------------
1442 const Type* Parse::Block::stack_type_at(int i) const {
1443 return get_type(flow()->stack_type_at(i));
1444 }
1445
1446
1447 //-----------------------------local_type_at-----------------------------------
1448 const Type* Parse::Block::local_type_at(int i) const {
1449 // Make dead locals fall to bottom.
1450 if (_live_locals.size() == 0) {
1451 MethodLivenessResult live_locals = flow()->outer()->method()->liveness_at_bci(start());
1452 // This bitmap can be zero length if we saw a breakpoint.
1453 // In such cases, pretend they are all live.
1454 ((Block*)this)->_live_locals = live_locals;
1455 }
1456 if (_live_locals.size() > 0 && !_live_locals.at(i))
1457 return Type::BOTTOM;
1458
1459 return get_type(flow()->local_type_at(i));
1460 }
1461
1462
1463 #ifndef PRODUCT
1464
1465 //----------------------------name_for_bc--------------------------------------
1466 // helper method for BytecodeParseHistogram
1467 static const char* name_for_bc(int i) {
1468 return Bytecodes::is_defined(i) ? Bytecodes::name(Bytecodes::cast(i)) : "xxxunusedxxx";
1469 }
1470
1471 //----------------------------BytecodeParseHistogram------------------------------------
1472 Parse::BytecodeParseHistogram::BytecodeParseHistogram(Parse *p, Compile *c) {
1473 _parser = p;
1474 _compiler = c;
1475 if( ! _initialized ) { _initialized = true; reset(); }
1476 }
1477
1478 //----------------------------current_count------------------------------------
1479 int Parse::BytecodeParseHistogram::current_count(BPHType bph_type) {
1480 switch( bph_type ) {
1481 case BPH_transforms: { return _parser->gvn().made_progress(); }
1482 case BPH_values: { return _parser->gvn().made_new_values(); }
1483 default: { ShouldNotReachHere(); return 0; }
1484 }
1485 }
1486
1487 //----------------------------initialized--------------------------------------
1488 bool Parse::BytecodeParseHistogram::initialized() { return _initialized; }
1489
1490 //----------------------------reset--------------------------------------------
1491 void Parse::BytecodeParseHistogram::reset() {
1492 int i = Bytecodes::number_of_codes;
1493 while (i-- > 0) { _bytecodes_parsed[i] = 0; _nodes_constructed[i] = 0; _nodes_transformed[i] = 0; _new_values[i] = 0; }
1494 }
1495
1496 //----------------------------set_initial_state--------------------------------
1497 // Record info when starting to parse one bytecode
1498 void Parse::BytecodeParseHistogram::set_initial_state( Bytecodes::Code bc ) {
1499 if( PrintParseStatistics && !_parser->is_osr_parse() ) {
1500 _initial_bytecode = bc;
1501 _initial_node_count = _compiler->unique();
1502 _initial_transforms = current_count(BPH_transforms);
1503 _initial_values = current_count(BPH_values);
1504 }
1505 }
1506
1507 //----------------------------record_change--------------------------------
1508 // Record results of parsing one bytecode
1509 void Parse::BytecodeParseHistogram::record_change() {
1510 if( PrintParseStatistics && !_parser->is_osr_parse() ) {
1511 ++_bytecodes_parsed[_initial_bytecode];
1512 _nodes_constructed [_initial_bytecode] += (_compiler->unique() - _initial_node_count);
1513 _nodes_transformed [_initial_bytecode] += (current_count(BPH_transforms) - _initial_transforms);
1514 _new_values [_initial_bytecode] += (current_count(BPH_values) - _initial_values);
1515 }
1516 }
1517
1518
1519 //----------------------------print--------------------------------------------
1520 void Parse::BytecodeParseHistogram::print(float cutoff) {
1521 ResourceMark rm;
1522 // print profile
1523 int total = 0;
1524 int i = 0;
1525 for( i = 0; i < Bytecodes::number_of_codes; ++i ) { total += _bytecodes_parsed[i]; }
1526 int abs_sum = 0;
1527 tty->cr(); //0123456789012345678901234567890123456789012345678901234567890123456789
1528 tty->print_cr("Histogram of %d parsed bytecodes:", total);
1529 if( total == 0 ) { return; }
1530 tty->cr();
1531 tty->print_cr("absolute: count of compiled bytecodes of this type");
1532 tty->print_cr("relative: percentage contribution to compiled nodes");
1533 tty->print_cr("nodes : Average number of nodes constructed per bytecode");
1534 tty->print_cr("rnodes : Significance towards total nodes constructed, (nodes*relative)");
1535 tty->print_cr("transforms: Average amount of transform progress per bytecode compiled");
1536 tty->print_cr("values : Average number of node values improved per bytecode");
1537 tty->print_cr("name : Bytecode name");
1538 tty->cr();
1539 tty->print_cr(" absolute relative nodes rnodes transforms values name");
1540 tty->print_cr("----------------------------------------------------------------------");
1541 while (--i > 0) {
1542 int abs = _bytecodes_parsed[i];
1543 float rel = abs * 100.0F / total;
1544 float nodes = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_constructed[i])/_bytecodes_parsed[i];
1545 float rnodes = _bytecodes_parsed[i] == 0 ? 0 : rel * nodes;
1546 float xforms = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_transformed[i])/_bytecodes_parsed[i];
1547 float values = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _new_values [i])/_bytecodes_parsed[i];
1548 if (cutoff <= rel) {
1549 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));
1550 abs_sum += abs;
1551 }
1552 }
1553 tty->print_cr("----------------------------------------------------------------------");
1554 float rel_sum = abs_sum * 100.0F / total;
1555 tty->print_cr("%10d %7.2f%% (cutoff = %.2f%%)", abs_sum, rel_sum, cutoff);
1556 tty->print_cr("----------------------------------------------------------------------");
1557 tty->cr();
1558 }
1559 #endif
1560
1561 //----------------------------load_state_from----------------------------------
1562 // Load block/map/sp. But not do not touch iter/bci.
1563 void Parse::load_state_from(Block* block) {
1564 set_block(block);
1565 // load the block's JVM state:
1566 set_map(block->start_map());
1567 set_sp( block->start_sp());
1568 }
1569
1570
1571 //-----------------------------record_state------------------------------------
1572 void Parse::Block::record_state(Parse* p) {
1573 assert(!is_merged(), "can only record state once, on 1st inflow");
1574 assert(start_sp() == p->sp(), "stack pointer must agree with ciTypeFlow");
1575 set_start_map(p->stop());
1576 }
1577
1578
1579 //------------------------------do_one_block-----------------------------------
1580 void Parse::do_one_block() {
1581 if (TraceOptoParse) {
1582 Block *b = block();
1583 int ns = b->num_successors();
1584 int nt = b->all_successors();
1585
1586 tty->print("Parsing block #%d at bci [%d,%d), successors:",
1587 block()->rpo(), block()->start(), block()->limit());
1588 for (int i = 0; i < nt; i++) {
1589 tty->print((( i < ns) ? " %d" : " %d(exception block)"), b->successor_at(i)->rpo());
1590 }
1591 if (b->is_loop_head()) {
1592 tty->print(" loop head");
1593 }
1594 if (b->is_irreducible_loop_entry()) {
1595 tty->print(" irreducible");
1596 }
1597 tty->cr();
1598 }
1599
1600 assert(block()->is_merged(), "must be merged before being parsed");
1601 block()->mark_parsed();
1602
1603 // Set iterator to start of block.
1604 iter().reset_to_bci(block()->start());
1605
1606 if (ProfileExceptionHandlers && block()->is_handler()) {
1607 ciMethodData* methodData = method()->method_data();
1608 if (methodData->is_mature()) {
1609 ciBitData data = methodData->exception_handler_bci_to_data(block()->start());
1610 if (!data.exception_handler_entered() || StressPrunedExceptionHandlers) {
1611 // dead catch block
1612 // Emit an uncommon trap instead of processing the block.
1613 set_parse_bci(block()->start());
1614 uncommon_trap(Deoptimization::Reason_unreached,
1615 Deoptimization::Action_reinterpret,
1616 nullptr, "dead catch block");
1617 return;
1618 }
1619 }
1620 }
1621
1622 CompileLog* log = C->log();
1623
1624 // Parse bytecodes
1625 while (!stopped() && !failing()) {
1626 iter().next();
1627
1628 // Learn the current bci from the iterator:
1629 set_parse_bci(iter().cur_bci());
1630
1631 if (bci() == block()->limit()) {
1632 // Do not walk into the next block until directed by do_all_blocks.
1633 merge(bci());
1634 break;
1635 }
1636 assert(bci() < block()->limit(), "bci still in block");
1637
1638 if (log != nullptr) {
1639 // Output an optional context marker, to help place actions
1640 // that occur during parsing of this BC. If there is no log
1641 // output until the next context string, this context string
1642 // will be silently ignored.
1643 log->set_context("bc code='%d' bci='%d'", (int)bc(), bci());
1644 }
1645
1646 if (block()->has_trap_at(bci())) {
1647 // We must respect the flow pass's traps, because it will refuse
1648 // to produce successors for trapping blocks.
1649 int trap_index = block()->flow()->trap_index();
1650 assert(trap_index != 0, "trap index must be valid");
1651 uncommon_trap(trap_index);
1652 break;
1653 }
1654
1655 NOT_PRODUCT( parse_histogram()->set_initial_state(bc()); );
1656
1657 #ifdef ASSERT
1658 int pre_bc_sp = sp();
1659 int inputs, depth;
1660 bool have_se = !stopped() && compute_stack_effects(inputs, depth);
1661 assert(!have_se || pre_bc_sp >= inputs, "have enough stack to execute this BC: pre_bc_sp=%d, inputs=%d", pre_bc_sp, inputs);
1662 #endif //ASSERT
1663
1664 do_one_bytecode();
1665 if (failing()) return;
1666
1667 assert(!have_se || stopped() || failing() || (sp() - pre_bc_sp) == depth,
1668 "incorrect depth prediction: sp=%d, pre_bc_sp=%d, depth=%d", sp(), pre_bc_sp, depth);
1669
1670 do_exceptions();
1671
1672 NOT_PRODUCT( parse_histogram()->record_change(); );
1673
1674 if (log != nullptr)
1675 log->clear_context(); // skip marker if nothing was printed
1676
1677 // Fall into next bytecode. Each bytecode normally has 1 sequential
1678 // successor which is typically made ready by visiting this bytecode.
1679 // If the successor has several predecessors, then it is a merge
1680 // point, starts a new basic block, and is handled like other basic blocks.
1681 }
1682 }
1683
1684
1685 //------------------------------merge------------------------------------------
1686 void Parse::set_parse_bci(int bci) {
1687 set_bci(bci);
1688 Node_Notes* nn = C->default_node_notes();
1689 if (nn == nullptr) return;
1690
1691 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls.
1692 if (!DebugInlinedCalls && depth() > 1) {
1693 return;
1694 }
1695
1696 // Update the JVMS annotation, if present.
1697 JVMState* jvms = nn->jvms();
1698 if (jvms != nullptr && jvms->bci() != bci) {
1699 // Update the JVMS.
1700 jvms = jvms->clone_shallow(C);
1701 jvms->set_bci(bci);
1702 nn->set_jvms(jvms);
1703 }
1704 }
1705
1706 //------------------------------merge------------------------------------------
1707 // Merge the current mapping into the basic block starting at bci
1708 void Parse::merge(int target_bci) {
1709 Block* target = successor_for_bci(target_bci);
1710 if (target == nullptr) { handle_missing_successor(target_bci); return; }
1711 assert(!target->is_ready(), "our arrival must be expected");
1712 int pnum = target->next_path_num();
1713 merge_common(target, pnum);
1714 }
1715
1716 //-------------------------merge_new_path--------------------------------------
1717 // Merge the current mapping into the basic block, using a new path
1718 void Parse::merge_new_path(int target_bci) {
1719 Block* target = successor_for_bci(target_bci);
1720 if (target == nullptr) { handle_missing_successor(target_bci); return; }
1721 assert(!target->is_ready(), "new path into frozen graph");
1722 int pnum = target->add_new_path();
1723 merge_common(target, pnum);
1724 }
1725
1726 //-------------------------merge_exception-------------------------------------
1727 // Merge the current mapping into the basic block starting at bci
1728 // The ex_oop must be pushed on the stack, unlike throw_to_exit.
1729 void Parse::merge_exception(int target_bci) {
1730 #ifdef ASSERT
1731 if (target_bci < bci()) {
1732 C->set_exception_backedge();
1733 }
1734 #endif
1735 assert(sp() == 1, "must have only the throw exception on the stack");
1736 Block* target = successor_for_bci(target_bci);
1737 if (target == nullptr) { handle_missing_successor(target_bci); return; }
1738 assert(target->is_handler(), "exceptions are handled by special blocks");
1739 int pnum = target->add_new_path();
1740 merge_common(target, pnum);
1741 }
1742
1743 //--------------------handle_missing_successor---------------------------------
1744 void Parse::handle_missing_successor(int target_bci) {
1745 #ifndef PRODUCT
1746 Block* b = block();
1747 int trap_bci = b->flow()->has_trap()? b->flow()->trap_bci(): -1;
1748 tty->print_cr("### Missing successor at bci:%d for block #%d (trap_bci:%d)", target_bci, b->rpo(), trap_bci);
1749 #endif
1750 ShouldNotReachHere();
1751 }
1752
1753 //--------------------------merge_common---------------------------------------
1754 void Parse::merge_common(Parse::Block* target, int pnum) {
1755 if (TraceOptoParse) {
1756 tty->print("Merging state at block #%d bci:%d", target->rpo(), target->start());
1757 }
1758
1759 // Zap extra stack slots to top
1760 assert(sp() == target->start_sp(), "");
1761 clean_stack(sp());
1762
1763 // Check for merge conflicts involving inline types
1764 JVMState* old_jvms = map()->jvms();
1765 int old_bci = bci();
1766 JVMState* tmp_jvms = old_jvms->clone_shallow(C);
1767 tmp_jvms->set_should_reexecute(true);
1768 tmp_jvms->bind_map(map());
1769 // Execution needs to restart a the next bytecode (entry of next
1770 // block)
1771 if (target->is_merged() ||
1772 pnum > PhiNode::Input ||
1773 target->is_handler() ||
1774 target->is_loop_head()) {
1775 set_parse_bci(target->start());
1776 for (uint j = TypeFunc::Parms; j < map()->req(); j++) {
1777 Node* n = map()->in(j); // Incoming change to target state.
1778 const Type* t = nullptr;
1779 if (tmp_jvms->is_loc(j)) {
1780 t = target->local_type_at(j - tmp_jvms->locoff());
1781 } else if (tmp_jvms->is_stk(j) && j < (uint)sp() + tmp_jvms->stkoff()) {
1782 t = target->stack_type_at(j - tmp_jvms->stkoff());
1783 }
1784 if (t != nullptr && t != Type::BOTTOM) {
1785 if (n->is_InlineType() && !t->is_inlinetypeptr()) {
1786 // Allocate inline type in src block to be able to merge it with oop in target block
1787 map()->set_req(j, n->as_InlineType()->buffer(this));
1788 } else if (!n->is_InlineType() && t->is_inlinetypeptr()) {
1789 // Scalarize null in src block to be able to merge it with inline type in target block
1790 assert(gvn().type(n)->is_zero_type(), "Should have been scalarized");
1791 map()->set_req(j, InlineTypeNode::make_null(gvn(), t->inline_klass()));
1792 }
1793 }
1794 }
1795 }
1796 old_jvms->bind_map(map());
1797 set_parse_bci(old_bci);
1798
1799 if (!target->is_merged()) { // No prior mapping at this bci
1800 if (TraceOptoParse) { tty->print(" with empty state"); }
1801
1802 // If this path is dead, do not bother capturing it as a merge.
1803 // It is "as if" we had 1 fewer predecessors from the beginning.
1804 if (stopped()) {
1805 if (TraceOptoParse) tty->print_cr(", but path is dead and doesn't count");
1806 return;
1807 }
1808
1809 // Make a region if we know there are multiple or unpredictable inputs.
1810 // (Also, if this is a plain fall-through, we might see another region,
1811 // which must not be allowed into this block's map.)
1812 if (pnum > PhiNode::Input // Known multiple inputs.
1813 || target->is_handler() // These have unpredictable inputs.
1814 || target->is_loop_head() // Known multiple inputs
1815 || control()->is_Region()) { // We must hide this guy.
1816
1817 int current_bci = bci();
1818 set_parse_bci(target->start()); // Set target bci
1819 if (target->is_SEL_head()) {
1820 DEBUG_ONLY( target->mark_merged_backedge(block()); )
1821 if (target->start() == 0) {
1822 // Add Parse Predicates for the special case when
1823 // there are backbranches to the method entry.
1824 add_parse_predicates();
1825 }
1826 }
1827 // Add a Region to start the new basic block. Phis will be added
1828 // later lazily.
1829 int edges = target->pred_count();
1830 if (edges < pnum) edges = pnum; // might be a new path!
1831 RegionNode *r = new RegionNode(edges+1);
1832 gvn().set_type(r, Type::CONTROL);
1833 record_for_igvn(r);
1834 // zap all inputs to null for debugging (done in Node(uint) constructor)
1835 // for (int j = 1; j < edges+1; j++) { r->init_req(j, nullptr); }
1836 r->init_req(pnum, control());
1837 set_control(r);
1838 target->copy_irreducible_status_to(r, jvms());
1839 set_parse_bci(current_bci); // Restore bci
1840 }
1841
1842 // Convert the existing Parser mapping into a mapping at this bci.
1843 store_state_to(target);
1844 assert(target->is_merged(), "do not come here twice");
1845
1846 } else { // Prior mapping at this bci
1847 if (TraceOptoParse) { tty->print(" with previous state"); }
1848 #ifdef ASSERT
1849 if (target->is_SEL_head()) {
1850 target->mark_merged_backedge(block());
1851 }
1852 #endif
1853
1854 // We must not manufacture more phis if the target is already parsed.
1855 bool nophi = target->is_parsed();
1856
1857 SafePointNode* newin = map();// Hang on to incoming mapping
1858 Block* save_block = block(); // Hang on to incoming block;
1859 load_state_from(target); // Get prior mapping
1860
1861 assert(newin->jvms()->locoff() == jvms()->locoff(), "JVMS layouts agree");
1862 assert(newin->jvms()->stkoff() == jvms()->stkoff(), "JVMS layouts agree");
1863 assert(newin->jvms()->monoff() == jvms()->monoff(), "JVMS layouts agree");
1864 assert(newin->jvms()->endoff() == jvms()->endoff(), "JVMS layouts agree");
1865
1866 // Iterate over my current mapping and the old mapping.
1867 // Where different, insert Phi functions.
1868 // Use any existing Phi functions.
1869 assert(control()->is_Region(), "must be merging to a region");
1870 RegionNode* r = control()->as_Region();
1871
1872 // Compute where to merge into
1873 // Merge incoming control path
1874 r->init_req(pnum, newin->control());
1875
1876 if (pnum == 1) { // Last merge for this Region?
1877 if (!block()->flow()->is_irreducible_loop_secondary_entry()) {
1878 Node* result = _gvn.transform(r);
1879 if (r != result && TraceOptoParse) {
1880 tty->print_cr("Block #%d replace %d with %d", block()->rpo(), r->_idx, result->_idx);
1881 }
1882 }
1883 record_for_igvn(r);
1884 }
1885
1886 // Update all the non-control inputs to map:
1887 assert(TypeFunc::Parms == newin->jvms()->locoff(), "parser map should contain only youngest jvms");
1888 bool check_elide_phi = target->is_SEL_backedge(save_block);
1889 bool last_merge = (pnum == PhiNode::Input);
1890 for (uint j = 1; j < newin->req(); j++) {
1891 Node* m = map()->in(j); // Current state of target.
1892 Node* n = newin->in(j); // Incoming change to target state.
1893 PhiNode* phi;
1894 if (m->is_Phi() && m->as_Phi()->region() == r) {
1895 phi = m->as_Phi();
1896 } else if (m->is_InlineType() && m->as_InlineType()->has_phi_inputs(r)) {
1897 phi = m->as_InlineType()->get_oop()->as_Phi();
1898 } else {
1899 phi = nullptr;
1900 }
1901 if (m != n) { // Different; must merge
1902 switch (j) {
1903 // Frame pointer and Return Address never changes
1904 case TypeFunc::FramePtr:// Drop m, use the original value
1905 case TypeFunc::ReturnAdr:
1906 break;
1907 case TypeFunc::Memory: // Merge inputs to the MergeMem node
1908 assert(phi == nullptr, "the merge contains phis, not vice versa");
1909 merge_memory_edges(n->as_MergeMem(), pnum, nophi);
1910 continue;
1911 default: // All normal stuff
1912 if (phi == nullptr) {
1913 const JVMState* jvms = map()->jvms();
1914 if (EliminateNestedLocks &&
1915 jvms->is_mon(j) && jvms->is_monitor_box(j)) {
1916 // BoxLock nodes are not commoning when EliminateNestedLocks is on.
1917 // Use old BoxLock node as merged box.
1918 assert(newin->jvms()->is_monitor_box(j), "sanity");
1919 // This assert also tests that nodes are BoxLock.
1920 assert(BoxLockNode::same_slot(n, m), "sanity");
1921 BoxLockNode* old_box = m->as_BoxLock();
1922 if (n->as_BoxLock()->is_unbalanced() && !old_box->is_unbalanced()) {
1923 // Preserve Unbalanced status.
1924 //
1925 // `old_box` can have only Regular or Coarsened status
1926 // because this code is executed only during Parse phase and
1927 // Incremental Inlining before EA and Macro nodes elimination.
1928 //
1929 // Incremental Inlining is executed after IGVN optimizations
1930 // during which BoxLock can be marked as Coarsened.
1931 old_box->set_coarsened(); // Verifies state
1932 old_box->set_unbalanced();
1933 }
1934 C->gvn_replace_by(n, m);
1935 } else if (!check_elide_phi || !target->can_elide_SEL_phi(j)) {
1936 phi = ensure_phi(j, nophi);
1937 }
1938 }
1939 break;
1940 }
1941 }
1942 // At this point, n might be top if:
1943 // - there is no phi (because TypeFlow detected a conflict), or
1944 // - the corresponding control edges is top (a dead incoming path)
1945 // It is a bug if we create a phi which sees a garbage value on a live path.
1946
1947 // Merging two inline types?
1948 if (phi != nullptr && phi->bottom_type()->is_inlinetypeptr()) {
1949 // Reload current state because it may have been updated by ensure_phi
1950 m = map()->in(j);
1951 InlineTypeNode* vtm = m->as_InlineType(); // Current inline type
1952 InlineTypeNode* vtn = n->as_InlineType(); // Incoming inline type
1953 assert(vtm->get_oop() == phi, "Inline type should have Phi input");
1954 if (TraceOptoParse) {
1955 #ifdef ASSERT
1956 tty->print_cr("\nMerging inline types");
1957 tty->print_cr("Current:");
1958 vtm->dump(2);
1959 tty->print_cr("Incoming:");
1960 vtn->dump(2);
1961 tty->cr();
1962 #endif
1963 }
1964 // Do the merge
1965 vtm->merge_with(&_gvn, vtn, pnum, last_merge);
1966 if (last_merge) {
1967 map()->set_req(j, _gvn.transform(vtm));
1968 record_for_igvn(vtm);
1969 }
1970 } else if (phi != nullptr) {
1971 assert(n != top() || r->in(pnum) == top(), "live value must not be garbage");
1972 assert(phi->region() == r, "");
1973 phi->set_req(pnum, n); // Then add 'n' to the merge
1974 if (last_merge) {
1975 // Last merge for this Phi.
1976 // So far, Phis have had a reasonable type from ciTypeFlow.
1977 // Now _gvn will join that with the meet of current inputs.
1978 // BOTTOM is never permissible here, 'cause pessimistically
1979 // Phis of pointers cannot lose the basic pointer type.
1980 debug_only(const Type* bt1 = phi->bottom_type());
1981 assert(bt1 != Type::BOTTOM, "should not be building conflict phis");
1982 map()->set_req(j, _gvn.transform(phi));
1983 debug_only(const Type* bt2 = phi->bottom_type());
1984 assert(bt2->higher_equal_speculative(bt1), "must be consistent with type-flow");
1985 record_for_igvn(phi);
1986 }
1987 }
1988 } // End of for all values to be merged
1989
1990 if (last_merge && !r->in(0)) { // The occasional useless Region
1991 assert(control() == r, "");
1992 set_control(r->nonnull_req());
1993 }
1994
1995 map()->merge_replaced_nodes_with(newin);
1996
1997 // newin has been subsumed into the lazy merge, and is now dead.
1998 set_block(save_block);
1999
2000 stop(); // done with this guy, for now
2001 }
2002
2003 if (TraceOptoParse) {
2004 tty->print_cr(" on path %d", pnum);
2005 }
2006
2007 // Done with this parser state.
2008 assert(stopped(), "");
2009 }
2010
2011
2012 //--------------------------merge_memory_edges---------------------------------
2013 void Parse::merge_memory_edges(MergeMemNode* n, int pnum, bool nophi) {
2014 // (nophi means we must not create phis, because we already parsed here)
2015 assert(n != nullptr, "");
2016 // Merge the inputs to the MergeMems
2017 MergeMemNode* m = merged_memory();
2018
2019 assert(control()->is_Region(), "must be merging to a region");
2020 RegionNode* r = control()->as_Region();
2021
2022 PhiNode* base = nullptr;
2023 MergeMemNode* remerge = nullptr;
2024 for (MergeMemStream mms(m, n); mms.next_non_empty2(); ) {
2025 Node *p = mms.force_memory();
2026 Node *q = mms.memory2();
2027 if (mms.is_empty() && nophi) {
2028 // Trouble: No new splits allowed after a loop body is parsed.
2029 // Instead, wire the new split into a MergeMem on the backedge.
2030 // The optimizer will sort it out, slicing the phi.
2031 if (remerge == nullptr) {
2032 guarantee(base != nullptr, "");
2033 assert(base->in(0) != nullptr, "should not be xformed away");
2034 remerge = MergeMemNode::make(base->in(pnum));
2035 gvn().set_type(remerge, Type::MEMORY);
2036 base->set_req(pnum, remerge);
2037 }
2038 remerge->set_memory_at(mms.alias_idx(), q);
2039 continue;
2040 }
2041 assert(!q->is_MergeMem(), "");
2042 PhiNode* phi;
2043 if (p != q) {
2044 phi = ensure_memory_phi(mms.alias_idx(), nophi);
2045 } else {
2046 if (p->is_Phi() && p->as_Phi()->region() == r)
2047 phi = p->as_Phi();
2048 else
2049 phi = nullptr;
2050 }
2051 // Insert q into local phi
2052 if (phi != nullptr) {
2053 assert(phi->region() == r, "");
2054 p = phi;
2055 phi->set_req(pnum, q);
2056 if (mms.at_base_memory()) {
2057 base = phi; // delay transforming it
2058 } else if (pnum == 1) {
2059 record_for_igvn(phi);
2060 p = _gvn.transform(phi);
2061 }
2062 mms.set_memory(p);// store back through the iterator
2063 }
2064 }
2065 // Transform base last, in case we must fiddle with remerging.
2066 if (base != nullptr && pnum == 1) {
2067 record_for_igvn(base);
2068 m->set_base_memory(_gvn.transform(base));
2069 }
2070 }
2071
2072
2073 //------------------------ensure_phis_everywhere-------------------------------
2074 void Parse::ensure_phis_everywhere() {
2075 ensure_phi(TypeFunc::I_O);
2076
2077 // Ensure a phi on all currently known memories.
2078 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) {
2079 ensure_memory_phi(mms.alias_idx());
2080 debug_only(mms.set_memory()); // keep the iterator happy
2081 }
2082
2083 // Note: This is our only chance to create phis for memory slices.
2084 // If we miss a slice that crops up later, it will have to be
2085 // merged into the base-memory phi that we are building here.
2086 // Later, the optimizer will comb out the knot, and build separate
2087 // phi-loops for each memory slice that matters.
2088
2089 // Monitors must nest nicely and not get confused amongst themselves.
2090 // Phi-ify everything up to the monitors, though.
2091 uint monoff = map()->jvms()->monoff();
2092 uint nof_monitors = map()->jvms()->nof_monitors();
2093
2094 assert(TypeFunc::Parms == map()->jvms()->locoff(), "parser map should contain only youngest jvms");
2095 bool check_elide_phi = block()->is_SEL_head();
2096 for (uint i = TypeFunc::Parms; i < monoff; i++) {
2097 if (!check_elide_phi || !block()->can_elide_SEL_phi(i)) {
2098 ensure_phi(i);
2099 }
2100 }
2101
2102 // Even monitors need Phis, though they are well-structured.
2103 // This is true for OSR methods, and also for the rare cases where
2104 // a monitor object is the subject of a replace_in_map operation.
2105 // See bugs 4426707 and 5043395.
2106 for (uint m = 0; m < nof_monitors; m++) {
2107 ensure_phi(map()->jvms()->monitor_obj_offset(m));
2108 }
2109 }
2110
2111
2112 //-----------------------------add_new_path------------------------------------
2113 // Add a previously unaccounted predecessor to this block.
2114 int Parse::Block::add_new_path() {
2115 // If there is no map, return the lowest unused path number.
2116 if (!is_merged()) return pred_count()+1; // there will be a map shortly
2117
2118 SafePointNode* map = start_map();
2119 if (!map->control()->is_Region())
2120 return pred_count()+1; // there may be a region some day
2121 RegionNode* r = map->control()->as_Region();
2122
2123 // Add new path to the region.
2124 uint pnum = r->req();
2125 r->add_req(nullptr);
2126
2127 for (uint i = 1; i < map->req(); i++) {
2128 Node* n = map->in(i);
2129 if (i == TypeFunc::Memory) {
2130 // Ensure a phi on all currently known memories.
2131 for (MergeMemStream mms(n->as_MergeMem()); mms.next_non_empty(); ) {
2132 Node* phi = mms.memory();
2133 if (phi->is_Phi() && phi->as_Phi()->region() == r) {
2134 assert(phi->req() == pnum, "must be same size as region");
2135 phi->add_req(nullptr);
2136 }
2137 }
2138 } else {
2139 if (n->is_Phi() && n->as_Phi()->region() == r) {
2140 assert(n->req() == pnum, "must be same size as region");
2141 n->add_req(nullptr);
2142 } else if (n->is_InlineType() && n->as_InlineType()->has_phi_inputs(r)) {
2143 n->as_InlineType()->add_new_path(r);
2144 }
2145 }
2146 }
2147
2148 return pnum;
2149 }
2150
2151 //------------------------------ensure_phi-------------------------------------
2152 // Turn the idx'th entry of the current map into a Phi
2153 PhiNode *Parse::ensure_phi(int idx, bool nocreate) {
2154 SafePointNode* map = this->map();
2155 Node* region = map->control();
2156 assert(region->is_Region(), "");
2157
2158 Node* o = map->in(idx);
2159 assert(o != nullptr, "");
2160
2161 if (o == top()) return nullptr; // TOP always merges into TOP
2162
2163 if (o->is_Phi() && o->as_Phi()->region() == region) {
2164 return o->as_Phi();
2165 }
2166 InlineTypeNode* vt = o->isa_InlineType();
2167 if (vt != nullptr && vt->has_phi_inputs(region)) {
2168 return vt->get_oop()->as_Phi();
2169 }
2170
2171 // Now use a Phi here for merging
2172 assert(!nocreate, "Cannot build a phi for a block already parsed.");
2173 const JVMState* jvms = map->jvms();
2174 const Type* t = nullptr;
2175 if (jvms->is_loc(idx)) {
2176 t = block()->local_type_at(idx - jvms->locoff());
2177 } else if (jvms->is_stk(idx)) {
2178 t = block()->stack_type_at(idx - jvms->stkoff());
2179 } else if (jvms->is_mon(idx)) {
2180 assert(!jvms->is_monitor_box(idx), "no phis for boxes");
2181 t = TypeInstPtr::BOTTOM; // this is sufficient for a lock object
2182 } else if ((uint)idx < TypeFunc::Parms) {
2183 t = o->bottom_type(); // Type::RETURN_ADDRESS or such-like.
2184 } else {
2185 assert(false, "no type information for this phi");
2186 }
2187
2188 // If the type falls to bottom, then this must be a local that
2189 // is already dead or is mixing ints and oops or some such.
2190 // Forcing it to top makes it go dead.
2191 if (t == Type::BOTTOM) {
2192 map->set_req(idx, top());
2193 return nullptr;
2194 }
2195
2196 // Do not create phis for top either.
2197 // A top on a non-null control flow must be an unused even after the.phi.
2198 if (t == Type::TOP || t == Type::HALF) {
2199 map->set_req(idx, top());
2200 return nullptr;
2201 }
2202
2203 if (vt != nullptr && t->is_inlinetypeptr()) {
2204 // Inline types are merged by merging their field values.
2205 // Create a cloned InlineTypeNode with phi inputs that
2206 // represents the merged inline type and update the map.
2207 vt = vt->clone_with_phis(&_gvn, region);
2208 map->set_req(idx, vt);
2209 return vt->get_oop()->as_Phi();
2210 } else {
2211 PhiNode* phi = PhiNode::make(region, o, t);
2212 gvn().set_type(phi, t);
2213 if (C->do_escape_analysis()) record_for_igvn(phi);
2214 map->set_req(idx, phi);
2215 return phi;
2216 }
2217 }
2218
2219 //--------------------------ensure_memory_phi----------------------------------
2220 // Turn the idx'th slice of the current memory into a Phi
2221 PhiNode *Parse::ensure_memory_phi(int idx, bool nocreate) {
2222 MergeMemNode* mem = merged_memory();
2223 Node* region = control();
2224 assert(region->is_Region(), "");
2225
2226 Node *o = (idx == Compile::AliasIdxBot)? mem->base_memory(): mem->memory_at(idx);
2227 assert(o != nullptr && o != top(), "");
2228
2229 PhiNode* phi;
2230 if (o->is_Phi() && o->as_Phi()->region() == region) {
2231 phi = o->as_Phi();
2232 if (phi == mem->base_memory() && idx >= Compile::AliasIdxRaw) {
2233 // clone the shared base memory phi to make a new memory split
2234 assert(!nocreate, "Cannot build a phi for a block already parsed.");
2235 const Type* t = phi->bottom_type();
2236 const TypePtr* adr_type = C->get_adr_type(idx);
2237 phi = phi->slice_memory(adr_type);
2238 gvn().set_type(phi, t);
2239 }
2240 return phi;
2241 }
2242
2243 // Now use a Phi here for merging
2244 assert(!nocreate, "Cannot build a phi for a block already parsed.");
2245 const Type* t = o->bottom_type();
2246 const TypePtr* adr_type = C->get_adr_type(idx);
2247 phi = PhiNode::make(region, o, t, adr_type);
2248 gvn().set_type(phi, t);
2249 if (idx == Compile::AliasIdxBot)
2250 mem->set_base_memory(phi);
2251 else
2252 mem->set_memory_at(idx, phi);
2253 return phi;
2254 }
2255
2256 //------------------------------call_register_finalizer-----------------------
2257 // Check the klass of the receiver and call register_finalizer if the
2258 // class need finalization.
2259 void Parse::call_register_finalizer() {
2260 Node* receiver = local(0);
2261 assert(receiver != nullptr && receiver->bottom_type()->isa_instptr() != nullptr,
2262 "must have non-null instance type");
2263
2264 const TypeInstPtr *tinst = receiver->bottom_type()->isa_instptr();
2265 if (tinst != nullptr && tinst->is_loaded() && !tinst->klass_is_exact()) {
2266 // The type isn't known exactly so see if CHA tells us anything.
2267 ciInstanceKlass* ik = tinst->instance_klass();
2268 if (!Dependencies::has_finalizable_subclass(ik)) {
2269 // No finalizable subclasses so skip the dynamic check.
2270 C->dependencies()->assert_has_no_finalizable_subclasses(ik);
2271 return;
2272 }
2273 }
2274
2275 // Insert a dynamic test for whether the instance needs
2276 // finalization. In general this will fold up since the concrete
2277 // class is often visible so the access flags are constant.
2278 Node* klass_addr = basic_plus_adr( receiver, receiver, oopDesc::klass_offset_in_bytes() );
2279 Node* klass = _gvn.transform(LoadKlassNode::make(_gvn, nullptr, immutable_memory(), klass_addr, TypeInstPtr::KLASS));
2280
2281 Node* access_flags_addr = basic_plus_adr(klass, klass, in_bytes(Klass::misc_flags_offset()));
2282 Node* access_flags = make_load(nullptr, access_flags_addr, TypeInt::UBYTE, T_BOOLEAN, MemNode::unordered);
2283
2284 Node* mask = _gvn.transform(new AndINode(access_flags, intcon(KlassFlags::_misc_has_finalizer)));
2285 Node* check = _gvn.transform(new CmpINode(mask, intcon(0)));
2286 Node* test = _gvn.transform(new BoolNode(check, BoolTest::ne));
2287
2288 IfNode* iff = create_and_map_if(control(), test, PROB_MAX, COUNT_UNKNOWN);
2289
2290 RegionNode* result_rgn = new RegionNode(3);
2291 record_for_igvn(result_rgn);
2292
2293 Node *skip_register = _gvn.transform(new IfFalseNode(iff));
2294 result_rgn->init_req(1, skip_register);
2295
2296 Node *needs_register = _gvn.transform(new IfTrueNode(iff));
2297 set_control(needs_register);
2298 if (stopped()) {
2299 // There is no slow path.
2300 result_rgn->init_req(2, top());
2301 } else {
2302 Node *call = make_runtime_call(RC_NO_LEAF,
2303 OptoRuntime::register_finalizer_Type(),
2304 OptoRuntime::register_finalizer_Java(),
2305 nullptr, TypePtr::BOTTOM,
2306 receiver);
2307 make_slow_call_ex(call, env()->Throwable_klass(), true);
2308
2309 Node* fast_io = call->in(TypeFunc::I_O);
2310 Node* fast_mem = call->in(TypeFunc::Memory);
2311 // These two phis are pre-filled with copies of of the fast IO and Memory
2312 Node* io_phi = PhiNode::make(result_rgn, fast_io, Type::ABIO);
2313 Node* mem_phi = PhiNode::make(result_rgn, fast_mem, Type::MEMORY, TypePtr::BOTTOM);
2314
2315 result_rgn->init_req(2, control());
2316 io_phi ->init_req(2, i_o());
2317 mem_phi ->init_req(2, reset_memory());
2318
2319 set_all_memory( _gvn.transform(mem_phi) );
2320 set_i_o( _gvn.transform(io_phi) );
2321 }
2322
2323 set_control( _gvn.transform(result_rgn) );
2324 }
2325
2326 // Add check to deoptimize once holder klass is fully initialized.
2327 void Parse::clinit_deopt() {
2328 assert(C->has_method(), "only for normal compilations");
2329 assert(depth() == 1, "only for main compiled method");
2330 assert(is_normal_parse(), "no barrier needed on osr entry");
2331 assert(!method()->holder()->is_not_initialized(), "initialization should have been started");
2332
2333 set_parse_bci(0);
2334
2335 Node* holder = makecon(TypeKlassPtr::make(method()->holder(), Type::trust_interfaces));
2336 guard_klass_being_initialized(holder);
2337 }
2338
2339 //------------------------------return_current---------------------------------
2340 // Append current _map to _exit_return
2341 void Parse::return_current(Node* value) {
2342 if (method()->intrinsic_id() == vmIntrinsics::_Object_init) {
2343 call_register_finalizer();
2344 }
2345
2346 // frame pointer is always same, already captured
2347 if (value != nullptr) {
2348 Node* phi = _exits.argument(0);
2349 const Type* return_type = phi->bottom_type();
2350 const TypeInstPtr* tr = return_type->isa_instptr();
2351 assert(!value->is_InlineType() || !value->as_InlineType()->is_larval(), "returning a larval");
2352 if ((tf()->returns_inline_type_as_fields() || (_caller->has_method() && !Compile::current()->inlining_incrementally())) &&
2353 return_type->is_inlinetypeptr()) {
2354 // Inline type is returned as fields, make sure it is scalarized
2355 if (!value->is_InlineType()) {
2356 value = InlineTypeNode::make_from_oop(this, value, return_type->inline_klass(), false);
2357 }
2358 if (!_caller->has_method() || Compile::current()->inlining_incrementally()) {
2359 // Returning from root or an incrementally inlined method. Make sure all non-flat
2360 // fields are buffered and re-execute if allocation triggers deoptimization.
2361 PreserveReexecuteState preexecs(this);
2362 assert(tf()->returns_inline_type_as_fields(), "must be returned as fields");
2363 jvms()->set_should_reexecute(true);
2364 inc_sp(1);
2365 value = value->as_InlineType()->allocate_fields(this);
2366 }
2367 } else if (value->is_InlineType()) {
2368 // Inline type is returned as oop, make sure it is buffered and re-execute
2369 // if allocation triggers deoptimization.
2370 PreserveReexecuteState preexecs(this);
2371 jvms()->set_should_reexecute(true);
2372 inc_sp(1);
2373 value = value->as_InlineType()->buffer(this);
2374 }
2375 // ...else
2376 // If returning oops to an interface-return, there is a silent free
2377 // cast from oop to interface allowed by the Verifier. Make it explicit here.
2378 phi->add_req(value);
2379 }
2380
2381 // Do not set_parse_bci, so that return goo is credited to the return insn.
2382 set_bci(InvocationEntryBci);
2383 if (method()->is_synchronized() && GenerateSynchronizationCode) {
2384 shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node());
2385 }
2386 if (C->env()->dtrace_method_probes()) {
2387 make_dtrace_method_exit(method());
2388 }
2389
2390 SafePointNode* exit_return = _exits.map();
2391 exit_return->in( TypeFunc::Control )->add_req( control() );
2392 exit_return->in( TypeFunc::I_O )->add_req( i_o () );
2393 Node *mem = exit_return->in( TypeFunc::Memory );
2394 for (MergeMemStream mms(mem->as_MergeMem(), merged_memory()); mms.next_non_empty2(); ) {
2395 if (mms.is_empty()) {
2396 // get a copy of the base memory, and patch just this one input
2397 const TypePtr* adr_type = mms.adr_type(C);
2398 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type);
2399 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), "");
2400 gvn().set_type_bottom(phi);
2401 phi->del_req(phi->req()-1); // prepare to re-patch
2402 mms.set_memory(phi);
2403 }
2404 mms.memory()->add_req(mms.memory2());
2405 }
2406
2407 if (_first_return) {
2408 _exits.map()->transfer_replaced_nodes_from(map(), _new_idx);
2409 _first_return = false;
2410 } else {
2411 _exits.map()->merge_replaced_nodes_with(map());
2412 }
2413
2414 stop_and_kill_map(); // This CFG path dies here
2415 }
2416
2417
2418 //------------------------------add_safepoint----------------------------------
2419 void Parse::add_safepoint() {
2420 uint parms = TypeFunc::Parms+1;
2421
2422 // Clear out dead values from the debug info.
2423 kill_dead_locals();
2424
2425 // Clone the JVM State
2426 SafePointNode *sfpnt = new SafePointNode(parms, nullptr);
2427
2428 // Capture memory state BEFORE a SafePoint. Since we can block at a
2429 // SafePoint we need our GC state to be safe; i.e. we need all our current
2430 // write barriers (card marks) to not float down after the SafePoint so we
2431 // must read raw memory. Likewise we need all oop stores to match the card
2432 // marks. If deopt can happen, we need ALL stores (we need the correct JVM
2433 // state on a deopt).
2434
2435 // We do not need to WRITE the memory state after a SafePoint. The control
2436 // edge will keep card-marks and oop-stores from floating up from below a
2437 // SafePoint and our true dependency added here will keep them from floating
2438 // down below a SafePoint.
2439
2440 // Clone the current memory state
2441 Node* mem = MergeMemNode::make(map()->memory());
2442
2443 mem = _gvn.transform(mem);
2444
2445 // Pass control through the safepoint
2446 sfpnt->init_req(TypeFunc::Control , control());
2447 // Fix edges normally used by a call
2448 sfpnt->init_req(TypeFunc::I_O , top() );
2449 sfpnt->init_req(TypeFunc::Memory , mem );
2450 sfpnt->init_req(TypeFunc::ReturnAdr, top() );
2451 sfpnt->init_req(TypeFunc::FramePtr , top() );
2452
2453 // Create a node for the polling address
2454 Node *polladr;
2455 Node *thread = _gvn.transform(new ThreadLocalNode());
2456 Node *polling_page_load_addr = _gvn.transform(basic_plus_adr(top(), thread, in_bytes(JavaThread::polling_page_offset())));
2457 polladr = make_load(control(), polling_page_load_addr, TypeRawPtr::BOTTOM, T_ADDRESS, Compile::AliasIdxRaw, MemNode::unordered);
2458 sfpnt->init_req(TypeFunc::Parms+0, _gvn.transform(polladr));
2459
2460 // Fix up the JVM State edges
2461 add_safepoint_edges(sfpnt);
2462 Node *transformed_sfpnt = _gvn.transform(sfpnt);
2463 set_control(transformed_sfpnt);
2464
2465 // Provide an edge from root to safepoint. This makes the safepoint
2466 // appear useful until the parse has completed.
2467 if (transformed_sfpnt->is_SafePoint()) {
2468 assert(C->root() != nullptr, "Expect parse is still valid");
2469 C->root()->add_prec(transformed_sfpnt);
2470 }
2471 }
2472
2473 #ifndef PRODUCT
2474 //------------------------show_parse_info--------------------------------------
2475 void Parse::show_parse_info() {
2476 InlineTree* ilt = nullptr;
2477 if (C->ilt() != nullptr) {
2478 JVMState* caller_jvms = is_osr_parse() ? caller()->caller() : caller();
2479 ilt = InlineTree::find_subtree_from_root(C->ilt(), caller_jvms, method());
2480 }
2481 if (PrintCompilation && Verbose) {
2482 if (depth() == 1) {
2483 if( ilt->count_inlines() ) {
2484 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
2485 ilt->count_inline_bcs());
2486 tty->cr();
2487 }
2488 } else {
2489 if (method()->is_synchronized()) tty->print("s");
2490 if (method()->has_exception_handlers()) tty->print("!");
2491 // Check this is not the final compiled version
2492 if (C->trap_can_recompile()) {
2493 tty->print("-");
2494 } else {
2495 tty->print(" ");
2496 }
2497 method()->print_short_name();
2498 if (is_osr_parse()) {
2499 tty->print(" @ %d", osr_bci());
2500 }
2501 tty->print(" (%d bytes)",method()->code_size());
2502 if (ilt->count_inlines()) {
2503 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
2504 ilt->count_inline_bcs());
2505 }
2506 tty->cr();
2507 }
2508 }
2509 if (PrintOpto && (depth() == 1 || PrintOptoInlining)) {
2510 // Print that we succeeded; suppress this message on the first osr parse.
2511
2512 if (method()->is_synchronized()) tty->print("s");
2513 if (method()->has_exception_handlers()) tty->print("!");
2514 // Check this is not the final compiled version
2515 if (C->trap_can_recompile() && depth() == 1) {
2516 tty->print("-");
2517 } else {
2518 tty->print(" ");
2519 }
2520 if( depth() != 1 ) { tty->print(" "); } // missing compile count
2521 for (int i = 1; i < depth(); ++i) { tty->print(" "); }
2522 method()->print_short_name();
2523 if (is_osr_parse()) {
2524 tty->print(" @ %d", osr_bci());
2525 }
2526 if (ilt->caller_bci() != -1) {
2527 tty->print(" @ %d", ilt->caller_bci());
2528 }
2529 tty->print(" (%d bytes)",method()->code_size());
2530 if (ilt->count_inlines()) {
2531 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
2532 ilt->count_inline_bcs());
2533 }
2534 tty->cr();
2535 }
2536 }
2537
2538
2539 //------------------------------dump-------------------------------------------
2540 // Dump information associated with the bytecodes of current _method
2541 void Parse::dump() {
2542 if( method() != nullptr ) {
2543 // Iterate over bytecodes
2544 ciBytecodeStream iter(method());
2545 for( Bytecodes::Code bc = iter.next(); bc != ciBytecodeStream::EOBC() ; bc = iter.next() ) {
2546 dump_bci( iter.cur_bci() );
2547 tty->cr();
2548 }
2549 }
2550 }
2551
2552 // Dump information associated with a byte code index, 'bci'
2553 void Parse::dump_bci(int bci) {
2554 // Output info on merge-points, cloning, and within _jsr..._ret
2555 // NYI
2556 tty->print(" bci:%d", bci);
2557 }
2558
2559 #endif