1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "compiler/compileLog.hpp"
27 #include "interpreter/linkResolver.hpp"
28 #include "oops/method.hpp"
29 #include "opto/addnode.hpp"
30 #include "opto/c2compiler.hpp"
31 #include "opto/castnode.hpp"
32 #include "opto/idealGraphPrinter.hpp"
33 #include "opto/locknode.hpp"
34 #include "opto/memnode.hpp"
35 #include "opto/opaquenode.hpp"
36 #include "opto/parse.hpp"
37 #include "opto/rootnode.hpp"
38 #include "opto/runtime.hpp"
39 #include "runtime/arguments.hpp"
40 #include "runtime/handles.inline.hpp"
41 #include "runtime/sharedRuntime.hpp"
42 #include "utilities/copy.hpp"
43
44 // Static array so we can figure out which bytecodes stop us from compiling
45 // the most. Some of the non-static variables are needed in bytecodeInfo.cpp
46 // and eventually should be encapsulated in a proper class (gri 8/18/98).
47
48 int nodes_created = 0;
49 int methods_parsed = 0;
50 int methods_seen = 0;
51 int blocks_parsed = 0;
52 int blocks_seen = 0;
53
54 int explicit_null_checks_inserted = 0;
55 int explicit_null_checks_elided = 0;
56 int all_null_checks_found = 0, implicit_null_checks = 0;
57 int implicit_null_throws = 0;
58
59 int reclaim_idx = 0;
60 int reclaim_in = 0;
61 int reclaim_node = 0;
62
63 #ifndef PRODUCT
64 bool Parse::BytecodeParseHistogram::_initialized = false;
65 uint Parse::BytecodeParseHistogram::_bytecodes_parsed [Bytecodes::number_of_codes];
66 uint Parse::BytecodeParseHistogram::_nodes_constructed[Bytecodes::number_of_codes];
67 uint Parse::BytecodeParseHistogram::_nodes_transformed[Bytecodes::number_of_codes];
68 uint Parse::BytecodeParseHistogram::_new_values [Bytecodes::number_of_codes];
69 #endif
70
71 //------------------------------print_statistics-------------------------------
72 #ifndef PRODUCT
73 void Parse::print_statistics() {
74 tty->print_cr("--- Compiler Statistics ---");
75 tty->print("Methods seen: %d Methods parsed: %d", methods_seen, methods_parsed);
76 tty->print(" Nodes created: %d", nodes_created);
77 tty->cr();
78 if (methods_seen != methods_parsed)
79 tty->print_cr("Reasons for parse failures (NOT cumulative):");
80 tty->print_cr("Blocks parsed: %d Blocks seen: %d", blocks_parsed, blocks_seen);
81
82 if( explicit_null_checks_inserted )
83 tty->print_cr("%d original NULL checks - %d elided (%2d%%); optimizer leaves %d,", explicit_null_checks_inserted, explicit_null_checks_elided, (100*explicit_null_checks_elided)/explicit_null_checks_inserted, all_null_checks_found);
84 if( all_null_checks_found )
85 tty->print_cr("%d made implicit (%2d%%)", implicit_null_checks,
86 (100*implicit_null_checks)/all_null_checks_found);
87 if( implicit_null_throws )
88 tty->print_cr("%d implicit null exceptions at runtime",
89 implicit_null_throws);
90
91 if( PrintParseStatistics && BytecodeParseHistogram::initialized() ) {
92 BytecodeParseHistogram::print();
93 }
94 }
95 #endif
96
97 //------------------------------ON STACK REPLACEMENT---------------------------
98
99 // Construct a node which can be used to get incoming state for
100 // on stack replacement.
101 Node *Parse::fetch_interpreter_state(int index,
102 BasicType bt,
103 Node *local_addrs,
104 Node *local_addrs_base) {
105 Node *mem = memory(Compile::AliasIdxRaw);
106 Node *adr = basic_plus_adr( local_addrs_base, local_addrs, -index*wordSize );
107 Node *ctl = control();
108
109 // Very similar to LoadNode::make, except we handle un-aligned longs and
110 // doubles on Sparc. Intel can handle them just fine directly.
111 Node *l = NULL;
112 switch (bt) { // Signature is flattened
113 case T_INT: l = new LoadINode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeInt::INT, MemNode::unordered); break;
114 case T_FLOAT: l = new LoadFNode(ctl, mem, adr, TypeRawPtr::BOTTOM, Type::FLOAT, MemNode::unordered); break;
115 case T_ADDRESS: l = new LoadPNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM, MemNode::unordered); break;
116 case T_OBJECT: l = new LoadPNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeInstPtr::BOTTOM, MemNode::unordered); break;
117 case T_LONG:
118 case T_DOUBLE: {
119 // Since arguments are in reverse order, the argument address 'adr'
120 // refers to the back half of the long/double. Recompute adr.
121 adr = basic_plus_adr(local_addrs_base, local_addrs, -(index+1)*wordSize);
122 if (Matcher::misaligned_doubles_ok) {
123 l = (bt == T_DOUBLE)
124 ? (Node*)new LoadDNode(ctl, mem, adr, TypeRawPtr::BOTTOM, Type::DOUBLE, MemNode::unordered)
125 : (Node*)new LoadLNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeLong::LONG, MemNode::unordered);
126 } else {
127 l = (bt == T_DOUBLE)
128 ? (Node*)new LoadD_unalignedNode(ctl, mem, adr, TypeRawPtr::BOTTOM, MemNode::unordered)
129 : (Node*)new LoadL_unalignedNode(ctl, mem, adr, TypeRawPtr::BOTTOM, MemNode::unordered);
130 }
131 break;
132 }
133 default: ShouldNotReachHere();
134 }
135 return _gvn.transform(l);
136 }
137
138 // Helper routine to prevent the interpreter from handing
139 // unexpected typestate to an OSR method.
140 // The Node l is a value newly dug out of the interpreter frame.
141 // The type is the type predicted by ciTypeFlow. Note that it is
142 // not a general type, but can only come from Type::get_typeflow_type.
143 // The safepoint is a map which will feed an uncommon trap.
144 Node* Parse::check_interpreter_type(Node* l, const Type* type,
145 SafePointNode* &bad_type_exit) {
146
147 const TypeOopPtr* tp = type->isa_oopptr();
148
149 // TypeFlow may assert null-ness if a type appears unloaded.
150 if (type == TypePtr::NULL_PTR ||
151 (tp != NULL && !tp->klass()->is_loaded())) {
152 // Value must be null, not a real oop.
153 Node* chk = _gvn.transform( new CmpPNode(l, null()) );
154 Node* tst = _gvn.transform( new BoolNode(chk, BoolTest::eq) );
155 IfNode* iff = create_and_map_if(control(), tst, PROB_MAX, COUNT_UNKNOWN);
156 set_control(_gvn.transform( new IfTrueNode(iff) ));
157 Node* bad_type = _gvn.transform( new IfFalseNode(iff) );
158 bad_type_exit->control()->add_req(bad_type);
159 l = null();
160 }
161
162 // Typeflow can also cut off paths from the CFG, based on
163 // types which appear unloaded, or call sites which appear unlinked.
164 // When paths are cut off, values at later merge points can rise
165 // toward more specific classes. Make sure these specific classes
166 // are still in effect.
167 if (tp != NULL && tp->klass() != C->env()->Object_klass()) {
168 // TypeFlow asserted a specific object type. Value must have that type.
169 Node* bad_type_ctrl = NULL;
170 l = gen_checkcast(l, makecon(TypeKlassPtr::make(tp->klass())), &bad_type_ctrl);
171 bad_type_exit->control()->add_req(bad_type_ctrl);
172 }
173
174 BasicType bt_l = _gvn.type(l)->basic_type();
175 BasicType bt_t = type->basic_type();
176 assert(_gvn.type(l)->higher_equal(type), "must constrain OSR typestate");
177 return l;
178 }
179
180 // Helper routine which sets up elements of the initial parser map when
181 // performing a parse for on stack replacement. Add values into map.
182 // The only parameter contains the address of a interpreter arguments.
183 void Parse::load_interpreter_state(Node* osr_buf) {
184 int index;
185 int max_locals = jvms()->loc_size();
186 int max_stack = jvms()->stk_size();
187
188
189 // Mismatch between method and jvms can occur since map briefly held
190 // an OSR entry state (which takes up one RawPtr word).
191 assert(max_locals == method()->max_locals(), "sanity");
192 assert(max_stack >= method()->max_stack(), "sanity");
193 assert((int)jvms()->endoff() == TypeFunc::Parms + max_locals + max_stack, "sanity");
194 assert((int)jvms()->endoff() == (int)map()->req(), "sanity");
195
196 // Find the start block.
197 Block* osr_block = start_block();
198 assert(osr_block->start() == osr_bci(), "sanity");
199
200 // Set initial BCI.
201 set_parse_bci(osr_block->start());
202
203 // Set initial stack depth.
204 set_sp(osr_block->start_sp());
205
206 // Check bailouts. We currently do not perform on stack replacement
207 // of loops in catch blocks or loops which branch with a non-empty stack.
208 if (sp() != 0) {
209 C->record_method_not_compilable("OSR starts with non-empty stack");
210 return;
211 }
212 // Do not OSR inside finally clauses:
213 if (osr_block->has_trap_at(osr_block->start())) {
214 C->record_method_not_compilable("OSR starts with an immediate trap");
215 return;
216 }
217
218 // Commute monitors from interpreter frame to compiler frame.
219 assert(jvms()->monitor_depth() == 0, "should be no active locks at beginning of osr");
220 int mcnt = osr_block->flow()->monitor_count();
221 Node *monitors_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals+mcnt*2-1)*wordSize);
222 for (index = 0; index < mcnt; index++) {
223 // Make a BoxLockNode for the monitor.
224 Node *box = _gvn.transform(new BoxLockNode(next_monitor()));
225
226
227 // Displaced headers and locked objects are interleaved in the
228 // temp OSR buffer. We only copy the locked objects out here.
229 // Fetch the locked object from the OSR temp buffer and copy to our fastlock node.
230 Node *lock_object = fetch_interpreter_state(index*2, T_OBJECT, monitors_addr, osr_buf);
231 // Try and copy the displaced header to the BoxNode
232 Node *displaced_hdr = fetch_interpreter_state((index*2) + 1, T_ADDRESS, monitors_addr, osr_buf);
233
234
235 store_to_memory(control(), box, displaced_hdr, T_ADDRESS, Compile::AliasIdxRaw, MemNode::unordered);
236
237 // Build a bogus FastLockNode (no code will be generated) and push the
238 // monitor into our debug info.
239 const FastLockNode *flock = _gvn.transform(new FastLockNode( 0, lock_object, box ))->as_FastLock();
240 map()->push_monitor(flock);
241
242 // If the lock is our method synchronization lock, tuck it away in
243 // _sync_lock for return and rethrow exit paths.
244 if (index == 0 && method()->is_synchronized()) {
245 _synch_lock = flock;
246 }
247 }
248
249 // Use the raw liveness computation to make sure that unexpected
250 // values don't propagate into the OSR frame.
251 MethodLivenessResult live_locals = method()->liveness_at_bci(osr_bci());
252 if (!live_locals.is_valid()) {
253 // Degenerate or breakpointed method.
254 C->record_method_not_compilable("OSR in empty or breakpointed method");
255 return;
256 }
257
258 // Extract the needed locals from the interpreter frame.
259 Node *locals_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals-1)*wordSize);
260
261 // find all the locals that the interpreter thinks contain live oops
262 const BitMap live_oops = method()->live_local_oops_at_bci(osr_bci());
263 for (index = 0; index < max_locals; index++) {
264
265 if (!live_locals.at(index)) {
266 continue;
267 }
268
269 const Type *type = osr_block->local_type_at(index);
270
271 if (type->isa_oopptr() != NULL) {
272
273 // 6403625: Verify that the interpreter oopMap thinks that the oop is live
274 // else we might load a stale oop if the MethodLiveness disagrees with the
275 // result of the interpreter. If the interpreter says it is dead we agree
276 // by making the value go to top.
277 //
278
279 if (!live_oops.at(index)) {
280 if (C->log() != NULL) {
281 C->log()->elem("OSR_mismatch local_index='%d'",index);
282 }
283 set_local(index, null());
284 // and ignore it for the loads
285 continue;
286 }
287 }
288
289 // Filter out TOP, HALF, and BOTTOM. (Cf. ensure_phi.)
290 if (type == Type::TOP || type == Type::HALF) {
291 continue;
292 }
293 // If the type falls to bottom, then this must be a local that
294 // is mixing ints and oops or some such. Forcing it to top
295 // makes it go dead.
296 if (type == Type::BOTTOM) {
297 continue;
298 }
299 // Construct code to access the appropriate local.
300 BasicType bt = type->basic_type();
301 if (type == TypePtr::NULL_PTR) {
302 // Ptr types are mixed together with T_ADDRESS but NULL is
303 // really for T_OBJECT types so correct it.
304 bt = T_OBJECT;
305 }
306 Node *value = fetch_interpreter_state(index, bt, locals_addr, osr_buf);
307 set_local(index, value);
308 }
309
310 // Extract the needed stack entries from the interpreter frame.
311 for (index = 0; index < sp(); index++) {
312 const Type *type = osr_block->stack_type_at(index);
313 if (type != Type::TOP) {
314 // Currently the compiler bails out when attempting to on stack replace
315 // at a bci with a non-empty stack. We should not reach here.
316 ShouldNotReachHere();
317 }
318 }
319
320 // End the OSR migration
321 make_runtime_call(RC_LEAF, OptoRuntime::osr_end_Type(),
322 CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end),
323 "OSR_migration_end", TypeRawPtr::BOTTOM,
324 osr_buf);
325
326 // Now that the interpreter state is loaded, make sure it will match
327 // at execution time what the compiler is expecting now:
328 SafePointNode* bad_type_exit = clone_map();
329 bad_type_exit->set_control(new RegionNode(1));
330
331 assert(osr_block->flow()->jsrs()->size() == 0, "should be no jsrs live at osr point");
332 for (index = 0; index < max_locals; index++) {
333 if (stopped()) break;
334 Node* l = local(index);
335 if (l->is_top()) continue; // nothing here
336 const Type *type = osr_block->local_type_at(index);
337 if (type->isa_oopptr() != NULL) {
338 if (!live_oops.at(index)) {
339 // skip type check for dead oops
340 continue;
341 }
342 }
343 if (osr_block->flow()->local_type_at(index)->is_return_address()) {
344 // In our current system it's illegal for jsr addresses to be
345 // live into an OSR entry point because the compiler performs
346 // inlining of jsrs. ciTypeFlow has a bailout that detect this
347 // case and aborts the compile if addresses are live into an OSR
348 // entry point. Because of that we can assume that any address
349 // locals at the OSR entry point are dead. Method liveness
350 // isn't precise enought to figure out that they are dead in all
351 // cases so simply skip checking address locals all
352 // together. Any type check is guaranteed to fail since the
353 // interpreter type is the result of a load which might have any
354 // value and the expected type is a constant.
355 continue;
356 }
357 set_local(index, check_interpreter_type(l, type, bad_type_exit));
358 }
359
360 for (index = 0; index < sp(); index++) {
361 if (stopped()) break;
362 Node* l = stack(index);
363 if (l->is_top()) continue; // nothing here
364 const Type *type = osr_block->stack_type_at(index);
365 set_stack(index, check_interpreter_type(l, type, bad_type_exit));
366 }
367
368 if (bad_type_exit->control()->req() > 1) {
369 // Build an uncommon trap here, if any inputs can be unexpected.
370 bad_type_exit->set_control(_gvn.transform( bad_type_exit->control() ));
371 record_for_igvn(bad_type_exit->control());
372 SafePointNode* types_are_good = map();
373 set_map(bad_type_exit);
374 // The unexpected type happens because a new edge is active
375 // in the CFG, which typeflow had previously ignored.
376 // E.g., Object x = coldAtFirst() && notReached()? "str": new Integer(123).
377 // This x will be typed as Integer if notReached is not yet linked.
378 // It could also happen due to a problem in ciTypeFlow analysis.
379 uncommon_trap(Deoptimization::Reason_constraint,
380 Deoptimization::Action_reinterpret);
381 set_map(types_are_good);
382 }
383 }
384
385 //------------------------------Parse------------------------------------------
386 // Main parser constructor.
387 Parse::Parse(JVMState* caller, ciMethod* parse_method, float expected_uses)
388 : _exits(caller)
389 {
390 // Init some variables
391 _caller = caller;
392 _method = parse_method;
393 _expected_uses = expected_uses;
394 _depth = 1 + (caller->has_method() ? caller->depth() : 0);
395 _wrote_final = false;
396 _wrote_volatile = false;
397 _wrote_stable = false;
398 _wrote_fields = false;
399 _alloc_with_final = NULL;
400 _entry_bci = InvocationEntryBci;
401 _tf = NULL;
402 _block = NULL;
403 _first_return = true;
404 _replaced_nodes_for_exceptions = false;
405 _new_idx = C->unique();
406 debug_only(_block_count = -1);
407 debug_only(_blocks = (Block*)-1);
408 #ifndef PRODUCT
409 if (PrintCompilation || PrintOpto) {
410 // Make sure I have an inline tree, so I can print messages about it.
411 JVMState* ilt_caller = is_osr_parse() ? caller->caller() : caller;
412 InlineTree::find_subtree_from_root(C->ilt(), ilt_caller, parse_method);
413 }
414 _max_switch_depth = 0;
415 _est_switch_depth = 0;
416 #endif
417
418 _tf = TypeFunc::make(method());
419 _iter.reset_to_method(method());
420 _flow = method()->get_flow_analysis();
421 if (_flow->failing()) {
422 C->record_method_not_compilable_all_tiers(_flow->failure_reason());
423 }
424
425 #ifndef PRODUCT
426 if (_flow->has_irreducible_entry()) {
427 C->set_parsed_irreducible_loop(true);
428 }
429 #endif
430
431 if (_expected_uses <= 0) {
432 _prof_factor = 1;
433 } else {
434 float prof_total = parse_method->interpreter_invocation_count();
435 if (prof_total <= _expected_uses) {
436 _prof_factor = 1;
437 } else {
438 _prof_factor = _expected_uses / prof_total;
439 }
440 }
441
442 CompileLog* log = C->log();
443 if (log != NULL) {
444 log->begin_head("parse method='%d' uses='%f'",
445 log->identify(parse_method), expected_uses);
446 if (depth() == 1 && C->is_osr_compilation()) {
447 log->print(" osr_bci='%d'", C->entry_bci());
448 }
449 log->stamp();
450 log->end_head();
451 }
452
453 // Accumulate deoptimization counts.
454 // (The range_check and store_check counts are checked elsewhere.)
455 ciMethodData* md = method()->method_data();
456 for (uint reason = 0; reason < md->trap_reason_limit(); reason++) {
457 uint md_count = md->trap_count(reason);
458 if (md_count != 0) {
459 if (md_count == md->trap_count_limit())
460 md_count += md->overflow_trap_count();
461 uint total_count = C->trap_count(reason);
462 uint old_count = total_count;
463 total_count += md_count;
464 // Saturate the add if it overflows.
465 if (total_count < old_count || total_count < md_count)
466 total_count = (uint)-1;
467 C->set_trap_count(reason, total_count);
468 if (log != NULL)
469 log->elem("observe trap='%s' count='%d' total='%d'",
470 Deoptimization::trap_reason_name(reason),
471 md_count, total_count);
472 }
473 }
474 // Accumulate total sum of decompilations, also.
475 C->set_decompile_count(C->decompile_count() + md->decompile_count());
476
477 _count_invocations = C->do_count_invocations();
478 _method_data_update = C->do_method_data_update();
479
480 if (log != NULL && method()->has_exception_handlers()) {
481 log->elem("observe that='has_exception_handlers'");
482 }
483
484 assert(method()->can_be_compiled(), "Can not parse this method, cutout earlier");
485 assert(method()->has_balanced_monitors(), "Can not parse unbalanced monitors, cutout earlier");
486
487 // Always register dependence if JVMTI is enabled, because
488 // either breakpoint setting or hotswapping of methods may
489 // cause deoptimization.
490 if (C->env()->jvmti_can_hotswap_or_post_breakpoint()) {
491 C->dependencies()->assert_evol_method(method());
492 }
493
494 methods_seen++;
495
496 // Do some special top-level things.
497 if (depth() == 1 && C->is_osr_compilation()) {
498 _entry_bci = C->entry_bci();
499 _flow = method()->get_osr_flow_analysis(osr_bci());
500 if (_flow->failing()) {
501 C->record_method_not_compilable(_flow->failure_reason());
502 #ifndef PRODUCT
503 if (PrintOpto && (Verbose || WizardMode)) {
504 tty->print_cr("OSR @%d type flow bailout: %s", _entry_bci, _flow->failure_reason());
505 if (Verbose) {
506 method()->print();
507 method()->print_codes();
508 _flow->print();
509 }
510 }
511 #endif
512 }
513 _tf = C->tf(); // the OSR entry type is different
514 }
515
516 #ifdef ASSERT
517 if (depth() == 1) {
518 assert(C->is_osr_compilation() == this->is_osr_parse(), "OSR in sync");
519 if (C->tf() != tf()) {
520 MutexLockerEx ml(Compile_lock, Mutex::_no_safepoint_check_flag);
521 assert(C->env()->system_dictionary_modification_counter_changed(),
522 "Must invalidate if TypeFuncs differ");
523 }
524 } else {
525 assert(!this->is_osr_parse(), "no recursive OSR");
526 }
527 #endif
528
529 methods_parsed++;
530 #ifndef PRODUCT
531 // add method size here to guarantee that inlined methods are added too
532 if (CITime)
533 _total_bytes_compiled += method()->code_size();
534
535 show_parse_info();
536 #endif
537
538 if (failing()) {
539 if (log) log->done("parse");
540 return;
541 }
542
543 gvn().set_type(root(), root()->bottom_type());
544 gvn().transform(top());
545
546 // Import the results of the ciTypeFlow.
547 init_blocks();
548
549 // Merge point for all normal exits
550 build_exits();
551
552 // Setup the initial JVM state map.
553 SafePointNode* entry_map = create_entry_map();
554
555 // Check for bailouts during map initialization
556 if (failing() || entry_map == NULL) {
557 if (log) log->done("parse");
558 return;
559 }
560
561 Node_Notes* caller_nn = C->default_node_notes();
562 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls.
563 if (DebugInlinedCalls || depth() == 1) {
564 C->set_default_node_notes(make_node_notes(caller_nn));
565 }
566
567 if (is_osr_parse()) {
568 Node* osr_buf = entry_map->in(TypeFunc::Parms+0);
569 entry_map->set_req(TypeFunc::Parms+0, top());
570 set_map(entry_map);
571 load_interpreter_state(osr_buf);
572 } else {
573 set_map(entry_map);
574 do_method_entry();
575 if (depth() == 1 && C->age_code()) {
576 decrement_age();
577 }
578 }
579
580 if (depth() == 1 && !failing()) {
581 // Add check to deoptimize the nmethod if RTM state was changed
582 rtm_deopt();
583 }
584
585 // Check for bailouts during method entry or RTM state check setup.
586 if (failing()) {
587 if (log) log->done("parse");
588 C->set_default_node_notes(caller_nn);
589 return;
590 }
591
592 entry_map = map(); // capture any changes performed by method setup code
593 assert(jvms()->endoff() == map()->req(), "map matches JVMS layout");
594
595 // We begin parsing as if we have just encountered a jump to the
596 // method entry.
597 Block* entry_block = start_block();
598 assert(entry_block->start() == (is_osr_parse() ? osr_bci() : 0), "");
599 set_map_clone(entry_map);
600 merge_common(entry_block, entry_block->next_path_num());
601
602 #ifndef PRODUCT
603 BytecodeParseHistogram *parse_histogram_obj = new (C->env()->arena()) BytecodeParseHistogram(this, C);
604 set_parse_histogram( parse_histogram_obj );
605 #endif
606
607 // Parse all the basic blocks.
608 do_all_blocks();
609
610 C->set_default_node_notes(caller_nn);
611
612 // Check for bailouts during conversion to graph
613 if (failing()) {
614 if (log) log->done("parse");
615 return;
616 }
617
618 // Fix up all exiting control flow.
619 set_map(entry_map);
620 do_exits();
621
622 if (log) log->done("parse nodes='%d' live='%d' memory='" SIZE_FORMAT "'",
623 C->unique(), C->live_nodes(), C->node_arena()->used());
624 }
625
626 //---------------------------do_all_blocks-------------------------------------
627 void Parse::do_all_blocks() {
628 bool has_irreducible = flow()->has_irreducible_entry();
629
630 // Walk over all blocks in Reverse Post-Order.
631 while (true) {
632 bool progress = false;
633 for (int rpo = 0; rpo < block_count(); rpo++) {
634 Block* block = rpo_at(rpo);
635
636 if (block->is_parsed()) continue;
637
638 if (!block->is_merged()) {
639 // Dead block, no state reaches this block
640 continue;
641 }
642
643 // Prepare to parse this block.
644 load_state_from(block);
645
646 if (stopped()) {
647 // Block is dead.
648 continue;
649 }
650
651 blocks_parsed++;
652
653 progress = true;
654 if (block->is_loop_head() || block->is_handler() || has_irreducible && !block->is_ready()) {
655 // Not all preds have been parsed. We must build phis everywhere.
656 // (Note that dead locals do not get phis built, ever.)
657 ensure_phis_everywhere();
658
659 if (block->is_SEL_head() &&
660 (UseLoopPredicate || LoopLimitCheck)) {
661 // Add predicate to single entry (not irreducible) loop head.
662 assert(!block->has_merged_backedge(), "only entry paths should be merged for now");
663 // Need correct bci for predicate.
664 // It is fine to set it here since do_one_block() will set it anyway.
665 set_parse_bci(block->start());
666 add_predicate();
667 // Add new region for back branches.
668 int edges = block->pred_count() - block->preds_parsed() + 1; // +1 for original region
669 RegionNode *r = new RegionNode(edges+1);
670 _gvn.set_type(r, Type::CONTROL);
671 record_for_igvn(r);
672 r->init_req(edges, control());
673 set_control(r);
674 // Add new phis.
675 ensure_phis_everywhere();
676 }
677
678 // Leave behind an undisturbed copy of the map, for future merges.
679 set_map(clone_map());
680 }
681
682 if (control()->is_Region() && !block->is_loop_head() && !has_irreducible && !block->is_handler()) {
683 // In the absence of irreducible loops, the Region and Phis
684 // associated with a merge that doesn't involve a backedge can
685 // be simplified now since the RPO parsing order guarantees
686 // that any path which was supposed to reach here has already
687 // been parsed or must be dead.
688 Node* c = control();
689 Node* result = _gvn.transform_no_reclaim(control());
690 if (c != result && TraceOptoParse) {
691 tty->print_cr("Block #%d replace %d with %d", block->rpo(), c->_idx, result->_idx);
692 }
693 if (result != top()) {
694 record_for_igvn(result);
695 }
696 }
697
698 // Parse the block.
699 do_one_block();
700
701 // Check for bailouts.
702 if (failing()) return;
703 }
704
705 // with irreducible loops multiple passes might be necessary to parse everything
706 if (!has_irreducible || !progress) {
707 break;
708 }
709 }
710
711 blocks_seen += block_count();
712
713 #ifndef PRODUCT
714 // Make sure there are no half-processed blocks remaining.
715 // Every remaining unprocessed block is dead and may be ignored now.
716 for (int rpo = 0; rpo < block_count(); rpo++) {
717 Block* block = rpo_at(rpo);
718 if (!block->is_parsed()) {
719 if (TraceOptoParse) {
720 tty->print_cr("Skipped dead block %d at bci:%d", rpo, block->start());
721 }
722 assert(!block->is_merged(), "no half-processed blocks");
723 }
724 }
725 #endif
726 }
727
728 //-------------------------------build_exits----------------------------------
729 // Build normal and exceptional exit merge points.
730 void Parse::build_exits() {
731 // make a clone of caller to prevent sharing of side-effects
732 _exits.set_map(_exits.clone_map());
733 _exits.clean_stack(_exits.sp());
734 _exits.sync_jvms();
735
736 RegionNode* region = new RegionNode(1);
737 record_for_igvn(region);
738 gvn().set_type_bottom(region);
739 _exits.set_control(region);
740
741 // Note: iophi and memphi are not transformed until do_exits.
742 Node* iophi = new PhiNode(region, Type::ABIO);
743 Node* memphi = new PhiNode(region, Type::MEMORY, TypePtr::BOTTOM);
744 gvn().set_type_bottom(iophi);
745 gvn().set_type_bottom(memphi);
746 _exits.set_i_o(iophi);
747 _exits.set_all_memory(memphi);
748
749 // Add a return value to the exit state. (Do not push it yet.)
750 if (tf()->range()->cnt() > TypeFunc::Parms) {
751 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms);
752 // Don't "bind" an unloaded return klass to the ret_phi. If the klass
753 // becomes loaded during the subsequent parsing, the loaded and unloaded
754 // types will not join when we transform and push in do_exits().
755 const TypeOopPtr* ret_oop_type = ret_type->isa_oopptr();
756 if (ret_oop_type && !ret_oop_type->klass()->is_loaded()) {
757 ret_type = TypeOopPtr::BOTTOM;
758 }
759 int ret_size = type2size[ret_type->basic_type()];
760 Node* ret_phi = new PhiNode(region, ret_type);
761 gvn().set_type_bottom(ret_phi);
762 _exits.ensure_stack(ret_size);
763 assert((int)(tf()->range()->cnt() - TypeFunc::Parms) == ret_size, "good tf range");
764 assert(method()->return_type()->size() == ret_size, "tf agrees w/ method");
765 _exits.set_argument(0, ret_phi); // here is where the parser finds it
766 // Note: ret_phi is not yet pushed, until do_exits.
767 }
768 }
769
770
771 //----------------------------build_start_state-------------------------------
772 // Construct a state which contains only the incoming arguments from an
773 // unknown caller. The method & bci will be NULL & InvocationEntryBci.
774 JVMState* Compile::build_start_state(StartNode* start, const TypeFunc* tf) {
775 int arg_size = tf->domain()->cnt();
776 int max_size = MAX2(arg_size, (int)tf->range()->cnt());
777 JVMState* jvms = new (this) JVMState(max_size - TypeFunc::Parms);
778 SafePointNode* map = new SafePointNode(max_size, NULL);
779 record_for_igvn(map);
780 assert(arg_size == TypeFunc::Parms + (is_osr_compilation() ? 1 : method()->arg_size()), "correct arg_size");
781 Node_Notes* old_nn = default_node_notes();
782 if (old_nn != NULL && has_method()) {
783 Node_Notes* entry_nn = old_nn->clone(this);
784 JVMState* entry_jvms = new(this) JVMState(method(), old_nn->jvms());
785 entry_jvms->set_offsets(0);
786 entry_jvms->set_bci(entry_bci());
787 entry_nn->set_jvms(entry_jvms);
788 set_default_node_notes(entry_nn);
789 }
790 uint i;
791 for (i = 0; i < (uint)arg_size; i++) {
792 Node* parm = initial_gvn()->transform(new ParmNode(start, i));
793 map->init_req(i, parm);
794 // Record all these guys for later GVN.
795 record_for_igvn(parm);
796 }
797 for (; i < map->req(); i++) {
798 map->init_req(i, top());
799 }
800 assert(jvms->argoff() == TypeFunc::Parms, "parser gets arguments here");
801 set_default_node_notes(old_nn);
802 map->set_jvms(jvms);
803 jvms->set_map(map);
804 return jvms;
805 }
806
807 //-----------------------------make_node_notes---------------------------------
808 Node_Notes* Parse::make_node_notes(Node_Notes* caller_nn) {
809 if (caller_nn == NULL) return NULL;
810 Node_Notes* nn = caller_nn->clone(C);
811 JVMState* caller_jvms = nn->jvms();
812 JVMState* jvms = new (C) JVMState(method(), caller_jvms);
813 jvms->set_offsets(0);
814 jvms->set_bci(_entry_bci);
815 nn->set_jvms(jvms);
816 return nn;
817 }
818
819
820 //--------------------------return_values--------------------------------------
821 void Compile::return_values(JVMState* jvms) {
822 GraphKit kit(jvms);
823 Node* ret = new ReturnNode(TypeFunc::Parms,
824 kit.control(),
825 kit.i_o(),
826 kit.reset_memory(),
827 kit.frameptr(),
828 kit.returnadr());
829 // Add zero or 1 return values
830 int ret_size = tf()->range()->cnt() - TypeFunc::Parms;
831 if (ret_size > 0) {
832 kit.inc_sp(-ret_size); // pop the return value(s)
833 kit.sync_jvms();
834 ret->add_req(kit.argument(0));
835 // Note: The second dummy edge is not needed by a ReturnNode.
836 }
837 // bind it to root
838 root()->add_req(ret);
839 record_for_igvn(ret);
840 initial_gvn()->transform_no_reclaim(ret);
841 }
842
843 //------------------------rethrow_exceptions-----------------------------------
844 // Bind all exception states in the list into a single RethrowNode.
845 void Compile::rethrow_exceptions(JVMState* jvms) {
846 GraphKit kit(jvms);
847 if (!kit.has_exceptions()) return; // nothing to generate
848 // Load my combined exception state into the kit, with all phis transformed:
849 SafePointNode* ex_map = kit.combine_and_pop_all_exception_states();
850 Node* ex_oop = kit.use_exception_state(ex_map);
851 RethrowNode* exit = new RethrowNode(kit.control(),
852 kit.i_o(), kit.reset_memory(),
853 kit.frameptr(), kit.returnadr(),
854 // like a return but with exception input
855 ex_oop);
856 // bind to root
857 root()->add_req(exit);
858 record_for_igvn(exit);
859 initial_gvn()->transform_no_reclaim(exit);
860 }
861
862 //---------------------------do_exceptions-------------------------------------
863 // Process exceptions arising from the current bytecode.
864 // Send caught exceptions to the proper handler within this method.
865 // Unhandled exceptions feed into _exit.
866 void Parse::do_exceptions() {
867 if (!has_exceptions()) return;
868
869 if (failing()) {
870 // Pop them all off and throw them away.
871 while (pop_exception_state() != NULL) ;
872 return;
873 }
874
875 PreserveJVMState pjvms(this, false);
876
877 SafePointNode* ex_map;
878 while ((ex_map = pop_exception_state()) != NULL) {
879 if (!method()->has_exception_handlers()) {
880 // Common case: Transfer control outward.
881 // Doing it this early allows the exceptions to common up
882 // even between adjacent method calls.
883 throw_to_exit(ex_map);
884 } else {
885 // Have to look at the exception first.
886 assert(stopped(), "catch_inline_exceptions trashes the map");
887 catch_inline_exceptions(ex_map);
888 stop_and_kill_map(); // we used up this exception state; kill it
889 }
890 }
891
892 // We now return to our regularly scheduled program:
893 }
894
895 //---------------------------throw_to_exit-------------------------------------
896 // Merge the given map into an exception exit from this method.
897 // The exception exit will handle any unlocking of receiver.
898 // The ex_oop must be saved within the ex_map, unlike merge_exception.
899 void Parse::throw_to_exit(SafePointNode* ex_map) {
900 // Pop the JVMS to (a copy of) the caller.
901 GraphKit caller;
902 caller.set_map_clone(_caller->map());
903 caller.set_bci(_caller->bci());
904 caller.set_sp(_caller->sp());
905 // Copy out the standard machine state:
906 for (uint i = 0; i < TypeFunc::Parms; i++) {
907 caller.map()->set_req(i, ex_map->in(i));
908 }
909 if (ex_map->has_replaced_nodes()) {
910 _replaced_nodes_for_exceptions = true;
911 }
912 caller.map()->transfer_replaced_nodes_from(ex_map, _new_idx);
913 // ...and the exception:
914 Node* ex_oop = saved_ex_oop(ex_map);
915 SafePointNode* caller_ex_map = caller.make_exception_state(ex_oop);
916 // Finally, collect the new exception state in my exits:
917 _exits.add_exception_state(caller_ex_map);
918 }
919
920 //------------------------------do_exits---------------------------------------
921 void Parse::do_exits() {
922 set_parse_bci(InvocationEntryBci);
923
924 // Now peephole on the return bits
925 Node* region = _exits.control();
926 _exits.set_control(gvn().transform(region));
927
928 Node* iophi = _exits.i_o();
929 _exits.set_i_o(gvn().transform(iophi));
930
931 // Figure out if we need to emit the trailing barrier. The barrier is only
932 // needed in the constructors, and only in three cases:
933 //
934 // 1. The constructor wrote a final. The effects of all initializations
935 // must be committed to memory before any code after the constructor
936 // publishes the reference to the newly constructed object. Rather
937 // than wait for the publication, we simply block the writes here.
938 // Rather than put a barrier on only those writes which are required
939 // to complete, we force all writes to complete.
940 //
941 // 2. On PPC64, also add MemBarRelease for constructors which write
942 // volatile fields. As support_IRIW_for_not_multiple_copy_atomic_cpu
943 // is set on PPC64, no sync instruction is issued after volatile
944 // stores. We want to guarantee the same behavior as on platforms
945 // with total store order, although this is not required by the Java
946 // memory model. So as with finals, we add a barrier here.
947 //
948 // 3. Experimental VM option is used to force the barrier if any field
949 // was written out in the constructor.
950 //
951 // "All bets are off" unless the first publication occurs after a
952 // normal return from the constructor. We do not attempt to detect
953 // such unusual early publications. But no barrier is needed on
954 // exceptional returns, since they cannot publish normally.
955 //
956 if (method()->is_initializer() &&
957 (wrote_final() ||
958 PPC64_ONLY(wrote_volatile() ||)
959 (AlwaysSafeConstructors && wrote_fields()))) {
960 _exits.insert_mem_bar(Op_MemBarRelease, alloc_with_final());
961 if (PrintOpto && (Verbose || WizardMode)) {
962 method()->print_name();
963 tty->print_cr(" writes finals and needs a memory barrier");
964 }
965 }
966
967 // Any method can write a @Stable field; insert memory barriers
968 // after those also. Can't bind predecessor allocation node (if any)
969 // with barrier because allocation doesn't always dominate
970 // MemBarRelease.
971 if (wrote_stable()) {
972 _exits.insert_mem_bar(Op_MemBarRelease);
973 if (PrintOpto && (Verbose || WizardMode)) {
974 method()->print_name();
975 tty->print_cr(" writes @Stable and needs a memory barrier");
976 }
977 }
978
979 for (MergeMemStream mms(_exits.merged_memory()); mms.next_non_empty(); ) {
980 // transform each slice of the original memphi:
981 mms.set_memory(_gvn.transform(mms.memory()));
982 }
983
984 if (tf()->range()->cnt() > TypeFunc::Parms) {
985 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms);
986 Node* ret_phi = _gvn.transform( _exits.argument(0) );
987 if (!_exits.control()->is_top() && _gvn.type(ret_phi)->empty()) {
988 // In case of concurrent class loading, the type we set for the
989 // ret_phi in build_exits() may have been too optimistic and the
990 // ret_phi may be top now.
991 // Otherwise, we've encountered an error and have to mark the method as
992 // not compilable. Just using an assertion instead would be dangerous
993 // as this could lead to an infinite compile loop in non-debug builds.
994 {
995 MutexLockerEx ml(Compile_lock, Mutex::_no_safepoint_check_flag);
996 if (C->env()->system_dictionary_modification_counter_changed()) {
997 C->record_failure(C2Compiler::retry_class_loading_during_parsing());
998 } else {
999 C->record_method_not_compilable("Can't determine return type.");
1000 }
1001 }
1002 return;
1003 }
1004 _exits.push_node(ret_type->basic_type(), ret_phi);
1005 }
1006
1007 // Note: Logic for creating and optimizing the ReturnNode is in Compile.
1008
1009 // Unlock along the exceptional paths.
1010 // This is done late so that we can common up equivalent exceptions
1011 // (e.g., null checks) arising from multiple points within this method.
1012 // See GraphKit::add_exception_state, which performs the commoning.
1013 bool do_synch = method()->is_synchronized() && GenerateSynchronizationCode;
1014
1015 // record exit from a method if compiled while Dtrace is turned on.
1016 if (do_synch || C->env()->dtrace_method_probes() || _replaced_nodes_for_exceptions) {
1017 // First move the exception list out of _exits:
1018 GraphKit kit(_exits.transfer_exceptions_into_jvms());
1019 SafePointNode* normal_map = kit.map(); // keep this guy safe
1020 // Now re-collect the exceptions into _exits:
1021 SafePointNode* ex_map;
1022 while ((ex_map = kit.pop_exception_state()) != NULL) {
1023 Node* ex_oop = kit.use_exception_state(ex_map);
1024 // Force the exiting JVM state to have this method at InvocationEntryBci.
1025 // The exiting JVM state is otherwise a copy of the calling JVMS.
1026 JVMState* caller = kit.jvms();
1027 JVMState* ex_jvms = caller->clone_shallow(C);
1028 ex_jvms->set_map(kit.clone_map());
1029 ex_jvms->map()->set_jvms(ex_jvms);
1030 ex_jvms->set_bci( InvocationEntryBci);
1031 kit.set_jvms(ex_jvms);
1032 if (do_synch) {
1033 // Add on the synchronized-method box/object combo
1034 kit.map()->push_monitor(_synch_lock);
1035 // Unlock!
1036 kit.shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node());
1037 }
1038 if (C->env()->dtrace_method_probes()) {
1039 kit.make_dtrace_method_exit(method());
1040 }
1041 if (_replaced_nodes_for_exceptions) {
1042 kit.map()->apply_replaced_nodes();
1043 }
1044 // Done with exception-path processing.
1045 ex_map = kit.make_exception_state(ex_oop);
1046 assert(ex_jvms->same_calls_as(ex_map->jvms()), "sanity");
1047 // Pop the last vestige of this method:
1048 ex_map->set_jvms(caller->clone_shallow(C));
1049 ex_map->jvms()->set_map(ex_map);
1050 _exits.push_exception_state(ex_map);
1051 }
1052 assert(_exits.map() == normal_map, "keep the same return state");
1053 }
1054
1055 {
1056 // Capture very early exceptions (receiver null checks) from caller JVMS
1057 GraphKit caller(_caller);
1058 SafePointNode* ex_map;
1059 while ((ex_map = caller.pop_exception_state()) != NULL) {
1060 _exits.add_exception_state(ex_map);
1061 }
1062 }
1063 _exits.map()->apply_replaced_nodes();
1064 }
1065
1066 //-----------------------------create_entry_map-------------------------------
1067 // Initialize our parser map to contain the types at method entry.
1068 // For OSR, the map contains a single RawPtr parameter.
1069 // Initial monitor locking for sync. methods is performed by do_method_entry.
1070 SafePointNode* Parse::create_entry_map() {
1071 // Check for really stupid bail-out cases.
1072 uint len = TypeFunc::Parms + method()->max_locals() + method()->max_stack();
1073 if (len >= 32760) {
1074 C->record_method_not_compilable_all_tiers("too many local variables");
1075 return NULL;
1076 }
1077
1078 // clear current replaced nodes that are of no use from here on (map was cloned in build_exits).
1079 _caller->map()->delete_replaced_nodes();
1080
1081 // If this is an inlined method, we may have to do a receiver null check.
1082 if (_caller->has_method() && is_normal_parse() && !method()->is_static()) {
1083 GraphKit kit(_caller);
1084 kit.null_check_receiver_before_call(method());
1085 _caller = kit.transfer_exceptions_into_jvms();
1086 if (kit.stopped()) {
1087 _exits.add_exception_states_from(_caller);
1088 _exits.set_jvms(_caller);
1089 return NULL;
1090 }
1091 }
1092
1093 assert(method() != NULL, "parser must have a method");
1094
1095 // Create an initial safepoint to hold JVM state during parsing
1096 JVMState* jvms = new (C) JVMState(method(), _caller->has_method() ? _caller : NULL);
1097 set_map(new SafePointNode(len, jvms));
1098 jvms->set_map(map());
1099 record_for_igvn(map());
1100 assert(jvms->endoff() == len, "correct jvms sizing");
1101
1102 SafePointNode* inmap = _caller->map();
1103 assert(inmap != NULL, "must have inmap");
1104 // In case of null check on receiver above
1105 map()->transfer_replaced_nodes_from(inmap, _new_idx);
1106
1107 uint i;
1108
1109 // Pass thru the predefined input parameters.
1110 for (i = 0; i < TypeFunc::Parms; i++) {
1111 map()->init_req(i, inmap->in(i));
1112 }
1113
1114 if (depth() == 1) {
1115 assert(map()->memory()->Opcode() == Op_Parm, "");
1116 // Insert the memory aliasing node
1117 set_all_memory(reset_memory());
1118 }
1119 assert(merged_memory(), "");
1120
1121 // Now add the locals which are initially bound to arguments:
1122 uint arg_size = tf()->domain()->cnt();
1123 ensure_stack(arg_size - TypeFunc::Parms); // OSR methods have funny args
1124 for (i = TypeFunc::Parms; i < arg_size; i++) {
1125 map()->init_req(i, inmap->argument(_caller, i - TypeFunc::Parms));
1126 }
1127
1128 // Clear out the rest of the map (locals and stack)
1129 for (i = arg_size; i < len; i++) {
1130 map()->init_req(i, top());
1131 }
1132
1133 SafePointNode* entry_map = stop();
1134 return entry_map;
1135 }
1136
1137 //-----------------------------do_method_entry--------------------------------
1138 // Emit any code needed in the pseudo-block before BCI zero.
1139 // The main thing to do is lock the receiver of a synchronized method.
1140 void Parse::do_method_entry() {
1141 set_parse_bci(InvocationEntryBci); // Pseudo-BCP
1142 set_sp(0); // Java Stack Pointer
1143
1144 NOT_PRODUCT( count_compiled_calls(true/*at_method_entry*/, false/*is_inline*/); )
1145
1146 if (C->env()->dtrace_method_probes()) {
1147 make_dtrace_method_entry(method());
1148 }
1149
1150 // If the method is synchronized, we need to construct a lock node, attach
1151 // it to the Start node, and pin it there.
1152 if (method()->is_synchronized()) {
1153 // Insert a FastLockNode right after the Start which takes as arguments
1154 // the current thread pointer, the "this" pointer & the address of the
1155 // stack slot pair used for the lock. The "this" pointer is a projection
1156 // off the start node, but the locking spot has to be constructed by
1157 // creating a ConLNode of 0, and boxing it with a BoxLockNode. The BoxLockNode
1158 // becomes the second argument to the FastLockNode call. The
1159 // FastLockNode becomes the new control parent to pin it to the start.
1160
1161 // Setup Object Pointer
1162 Node *lock_obj = NULL;
1163 if(method()->is_static()) {
1164 ciInstance* mirror = _method->holder()->java_mirror();
1165 const TypeInstPtr *t_lock = TypeInstPtr::make(mirror);
1166 lock_obj = makecon(t_lock);
1167 } else { // Else pass the "this" pointer,
1168 lock_obj = local(0); // which is Parm0 from StartNode
1169 }
1170 // Clear out dead values from the debug info.
1171 kill_dead_locals();
1172 // Build the FastLockNode
1173 _synch_lock = shared_lock(lock_obj);
1174 }
1175
1176 // Feed profiling data for parameters to the type system so it can
1177 // propagate it as speculative types
1178 record_profiled_parameters_for_speculation();
1179
1180 if (depth() == 1) {
1181 increment_and_test_invocation_counter(Tier2CompileThreshold);
1182 }
1183 }
1184
1185 //------------------------------init_blocks------------------------------------
1186 // Initialize our parser map to contain the types/monitors at method entry.
1187 void Parse::init_blocks() {
1188 // Create the blocks.
1189 _block_count = flow()->block_count();
1190 _blocks = NEW_RESOURCE_ARRAY(Block, _block_count);
1191 Copy::zero_to_bytes(_blocks, sizeof(Block)*_block_count);
1192
1193 int rpo;
1194
1195 // Initialize the structs.
1196 for (rpo = 0; rpo < block_count(); rpo++) {
1197 Block* block = rpo_at(rpo);
1198 block->init_node(this, rpo);
1199 }
1200
1201 // Collect predecessor and successor information.
1202 for (rpo = 0; rpo < block_count(); rpo++) {
1203 Block* block = rpo_at(rpo);
1204 block->init_graph(this);
1205 }
1206 }
1207
1208 //-------------------------------init_node-------------------------------------
1209 void Parse::Block::init_node(Parse* outer, int rpo) {
1210 _flow = outer->flow()->rpo_at(rpo);
1211 _pred_count = 0;
1212 _preds_parsed = 0;
1213 _count = 0;
1214 assert(pred_count() == 0 && preds_parsed() == 0, "sanity");
1215 assert(!(is_merged() || is_parsed() || is_handler() || has_merged_backedge()), "sanity");
1216 assert(_live_locals.size() == 0, "sanity");
1217
1218 // entry point has additional predecessor
1219 if (flow()->is_start()) _pred_count++;
1220 assert(flow()->is_start() == (this == outer->start_block()), "");
1221 }
1222
1223 //-------------------------------init_graph------------------------------------
1224 void Parse::Block::init_graph(Parse* outer) {
1225 // Create the successor list for this parser block.
1226 GrowableArray<ciTypeFlow::Block*>* tfs = flow()->successors();
1227 GrowableArray<ciTypeFlow::Block*>* tfe = flow()->exceptions();
1228 int ns = tfs->length();
1229 int ne = tfe->length();
1230 _num_successors = ns;
1231 _all_successors = ns+ne;
1232 _successors = (ns+ne == 0) ? NULL : NEW_RESOURCE_ARRAY(Block*, ns+ne);
1233 int p = 0;
1234 for (int i = 0; i < ns+ne; i++) {
1235 ciTypeFlow::Block* tf2 = (i < ns) ? tfs->at(i) : tfe->at(i-ns);
1236 Block* block2 = outer->rpo_at(tf2->rpo());
1237 _successors[i] = block2;
1238
1239 // Accumulate pred info for the other block, too.
1240 if (i < ns) {
1241 block2->_pred_count++;
1242 } else {
1243 block2->_is_handler = true;
1244 }
1245
1246 #ifdef ASSERT
1247 // A block's successors must be distinguishable by BCI.
1248 // That is, no bytecode is allowed to branch to two different
1249 // clones of the same code location.
1250 for (int j = 0; j < i; j++) {
1251 Block* block1 = _successors[j];
1252 if (block1 == block2) continue; // duplicates are OK
1253 assert(block1->start() != block2->start(), "successors have unique bcis");
1254 }
1255 #endif
1256 }
1257
1258 // Note: We never call next_path_num along exception paths, so they
1259 // never get processed as "ready". Also, the input phis of exception
1260 // handlers get specially processed, so that
1261 }
1262
1263 //---------------------------successor_for_bci---------------------------------
1264 Parse::Block* Parse::Block::successor_for_bci(int bci) {
1265 for (int i = 0; i < all_successors(); i++) {
1266 Block* block2 = successor_at(i);
1267 if (block2->start() == bci) return block2;
1268 }
1269 // We can actually reach here if ciTypeFlow traps out a block
1270 // due to an unloaded class, and concurrently with compilation the
1271 // class is then loaded, so that a later phase of the parser is
1272 // able to see more of the bytecode CFG. Or, the flow pass and
1273 // the parser can have a minor difference of opinion about executability
1274 // of bytecodes. For example, "obj.field = null" is executable even
1275 // if the field's type is an unloaded class; the flow pass used to
1276 // make a trap for such code.
1277 return NULL;
1278 }
1279
1280
1281 //-----------------------------stack_type_at-----------------------------------
1282 const Type* Parse::Block::stack_type_at(int i) const {
1283 return get_type(flow()->stack_type_at(i));
1284 }
1285
1286
1287 //-----------------------------local_type_at-----------------------------------
1288 const Type* Parse::Block::local_type_at(int i) const {
1289 // Make dead locals fall to bottom.
1290 if (_live_locals.size() == 0) {
1291 MethodLivenessResult live_locals = flow()->outer()->method()->liveness_at_bci(start());
1292 // This bitmap can be zero length if we saw a breakpoint.
1293 // In such cases, pretend they are all live.
1294 ((Block*)this)->_live_locals = live_locals;
1295 }
1296 if (_live_locals.size() > 0 && !_live_locals.at(i))
1297 return Type::BOTTOM;
1298
1299 return get_type(flow()->local_type_at(i));
1300 }
1301
1302
1303 #ifndef PRODUCT
1304
1305 //----------------------------name_for_bc--------------------------------------
1306 // helper method for BytecodeParseHistogram
1307 static const char* name_for_bc(int i) {
1308 return Bytecodes::is_defined(i) ? Bytecodes::name(Bytecodes::cast(i)) : "xxxunusedxxx";
1309 }
1310
1311 //----------------------------BytecodeParseHistogram------------------------------------
1312 Parse::BytecodeParseHistogram::BytecodeParseHistogram(Parse *p, Compile *c) {
1313 _parser = p;
1314 _compiler = c;
1315 if( ! _initialized ) { _initialized = true; reset(); }
1316 }
1317
1318 //----------------------------current_count------------------------------------
1319 int Parse::BytecodeParseHistogram::current_count(BPHType bph_type) {
1320 switch( bph_type ) {
1321 case BPH_transforms: { return _parser->gvn().made_progress(); }
1322 case BPH_values: { return _parser->gvn().made_new_values(); }
1323 default: { ShouldNotReachHere(); return 0; }
1324 }
1325 }
1326
1327 //----------------------------initialized--------------------------------------
1328 bool Parse::BytecodeParseHistogram::initialized() { return _initialized; }
1329
1330 //----------------------------reset--------------------------------------------
1331 void Parse::BytecodeParseHistogram::reset() {
1332 int i = Bytecodes::number_of_codes;
1333 while (i-- > 0) { _bytecodes_parsed[i] = 0; _nodes_constructed[i] = 0; _nodes_transformed[i] = 0; _new_values[i] = 0; }
1334 }
1335
1336 //----------------------------set_initial_state--------------------------------
1337 // Record info when starting to parse one bytecode
1338 void Parse::BytecodeParseHistogram::set_initial_state( Bytecodes::Code bc ) {
1339 if( PrintParseStatistics && !_parser->is_osr_parse() ) {
1340 _initial_bytecode = bc;
1341 _initial_node_count = _compiler->unique();
1342 _initial_transforms = current_count(BPH_transforms);
1343 _initial_values = current_count(BPH_values);
1344 }
1345 }
1346
1347 //----------------------------record_change--------------------------------
1348 // Record results of parsing one bytecode
1349 void Parse::BytecodeParseHistogram::record_change() {
1350 if( PrintParseStatistics && !_parser->is_osr_parse() ) {
1351 ++_bytecodes_parsed[_initial_bytecode];
1352 _nodes_constructed [_initial_bytecode] += (_compiler->unique() - _initial_node_count);
1353 _nodes_transformed [_initial_bytecode] += (current_count(BPH_transforms) - _initial_transforms);
1354 _new_values [_initial_bytecode] += (current_count(BPH_values) - _initial_values);
1355 }
1356 }
1357
1358
1359 //----------------------------print--------------------------------------------
1360 void Parse::BytecodeParseHistogram::print(float cutoff) {
1361 ResourceMark rm;
1362 // print profile
1363 int total = 0;
1364 int i = 0;
1365 for( i = 0; i < Bytecodes::number_of_codes; ++i ) { total += _bytecodes_parsed[i]; }
1366 int abs_sum = 0;
1367 tty->cr(); //0123456789012345678901234567890123456789012345678901234567890123456789
1368 tty->print_cr("Histogram of %d parsed bytecodes:", total);
1369 if( total == 0 ) { return; }
1370 tty->cr();
1371 tty->print_cr("absolute: count of compiled bytecodes of this type");
1372 tty->print_cr("relative: percentage contribution to compiled nodes");
1373 tty->print_cr("nodes : Average number of nodes constructed per bytecode");
1374 tty->print_cr("rnodes : Significance towards total nodes constructed, (nodes*relative)");
1375 tty->print_cr("transforms: Average amount of tranform progress per bytecode compiled");
1376 tty->print_cr("values : Average number of node values improved per bytecode");
1377 tty->print_cr("name : Bytecode name");
1378 tty->cr();
1379 tty->print_cr(" absolute relative nodes rnodes transforms values name");
1380 tty->print_cr("----------------------------------------------------------------------");
1381 while (--i > 0) {
1382 int abs = _bytecodes_parsed[i];
1383 float rel = abs * 100.0F / total;
1384 float nodes = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_constructed[i])/_bytecodes_parsed[i];
1385 float rnodes = _bytecodes_parsed[i] == 0 ? 0 : rel * nodes;
1386 float xforms = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_transformed[i])/_bytecodes_parsed[i];
1387 float values = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _new_values [i])/_bytecodes_parsed[i];
1388 if (cutoff <= rel) {
1389 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));
1390 abs_sum += abs;
1391 }
1392 }
1393 tty->print_cr("----------------------------------------------------------------------");
1394 float rel_sum = abs_sum * 100.0F / total;
1395 tty->print_cr("%10d %7.2f%% (cutoff = %.2f%%)", abs_sum, rel_sum, cutoff);
1396 tty->print_cr("----------------------------------------------------------------------");
1397 tty->cr();
1398 }
1399 #endif
1400
1401 //----------------------------load_state_from----------------------------------
1402 // Load block/map/sp. But not do not touch iter/bci.
1403 void Parse::load_state_from(Block* block) {
1404 set_block(block);
1405 // load the block's JVM state:
1406 set_map(block->start_map());
1407 set_sp( block->start_sp());
1408 }
1409
1410
1411 //-----------------------------record_state------------------------------------
1412 void Parse::Block::record_state(Parse* p) {
1413 assert(!is_merged(), "can only record state once, on 1st inflow");
1414 assert(start_sp() == p->sp(), "stack pointer must agree with ciTypeFlow");
1415 set_start_map(p->stop());
1416 }
1417
1418
1419 //------------------------------do_one_block-----------------------------------
1420 void Parse::do_one_block() {
1421 if (TraceOptoParse) {
1422 Block *b = block();
1423 int ns = b->num_successors();
1424 int nt = b->all_successors();
1425
1426 tty->print("Parsing block #%d at bci [%d,%d), successors: ",
1427 block()->rpo(), block()->start(), block()->limit());
1428 for (int i = 0; i < nt; i++) {
1429 tty->print((( i < ns) ? " %d" : " %d(e)"), b->successor_at(i)->rpo());
1430 }
1431 if (b->is_loop_head()) tty->print(" lphd");
1432 tty->cr();
1433 }
1434
1435 assert(block()->is_merged(), "must be merged before being parsed");
1436 block()->mark_parsed();
1437 ++_blocks_parsed;
1438
1439 // Set iterator to start of block.
1440 iter().reset_to_bci(block()->start());
1441
1442 CompileLog* log = C->log();
1443
1444 // Parse bytecodes
1445 while (!stopped() && !failing()) {
1446 iter().next();
1447
1448 // Learn the current bci from the iterator:
1449 set_parse_bci(iter().cur_bci());
1450
1451 if (bci() == block()->limit()) {
1452 // Do not walk into the next block until directed by do_all_blocks.
1453 merge(bci());
1454 break;
1455 }
1456 assert(bci() < block()->limit(), "bci still in block");
1457
1458 if (log != NULL) {
1459 // Output an optional context marker, to help place actions
1460 // that occur during parsing of this BC. If there is no log
1461 // output until the next context string, this context string
1462 // will be silently ignored.
1463 log->set_context("bc code='%d' bci='%d'", (int)bc(), bci());
1464 }
1465
1466 if (block()->has_trap_at(bci())) {
1467 // We must respect the flow pass's traps, because it will refuse
1468 // to produce successors for trapping blocks.
1469 int trap_index = block()->flow()->trap_index();
1470 assert(trap_index != 0, "trap index must be valid");
1471 uncommon_trap(trap_index);
1472 break;
1473 }
1474
1475 NOT_PRODUCT( parse_histogram()->set_initial_state(bc()); );
1476
1477 #ifdef ASSERT
1478 int pre_bc_sp = sp();
1479 int inputs, depth;
1480 bool have_se = !stopped() && compute_stack_effects(inputs, depth);
1481 assert(!have_se || pre_bc_sp >= inputs, "have enough stack to execute this BC: pre_bc_sp=%d, inputs=%d", pre_bc_sp, inputs);
1482 #endif //ASSERT
1483
1484 do_one_bytecode();
1485
1486 assert(!have_se || stopped() || failing() || (sp() - pre_bc_sp) == depth,
1487 "incorrect depth prediction: sp=%d, pre_bc_sp=%d, depth=%d", sp(), pre_bc_sp, depth);
1488
1489 do_exceptions();
1490
1491 NOT_PRODUCT( parse_histogram()->record_change(); );
1492
1493 if (log != NULL)
1494 log->clear_context(); // skip marker if nothing was printed
1495
1496 // Fall into next bytecode. Each bytecode normally has 1 sequential
1497 // successor which is typically made ready by visiting this bytecode.
1498 // If the successor has several predecessors, then it is a merge
1499 // point, starts a new basic block, and is handled like other basic blocks.
1500 }
1501 }
1502
1503
1504 //------------------------------merge------------------------------------------
1505 void Parse::set_parse_bci(int bci) {
1506 set_bci(bci);
1507 Node_Notes* nn = C->default_node_notes();
1508 if (nn == NULL) return;
1509
1510 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls.
1511 if (!DebugInlinedCalls && depth() > 1) {
1512 return;
1513 }
1514
1515 // Update the JVMS annotation, if present.
1516 JVMState* jvms = nn->jvms();
1517 if (jvms != NULL && jvms->bci() != bci) {
1518 // Update the JVMS.
1519 jvms = jvms->clone_shallow(C);
1520 jvms->set_bci(bci);
1521 nn->set_jvms(jvms);
1522 }
1523 }
1524
1525 //------------------------------merge------------------------------------------
1526 // Merge the current mapping into the basic block starting at bci
1527 void Parse::merge(int target_bci) {
1528 Block* target = successor_for_bci(target_bci);
1529 if (target == NULL) { handle_missing_successor(target_bci); return; }
1530 assert(!target->is_ready(), "our arrival must be expected");
1531 int pnum = target->next_path_num();
1532 merge_common(target, pnum);
1533 }
1534
1535 //-------------------------merge_new_path--------------------------------------
1536 // Merge the current mapping into the basic block, using a new path
1537 void Parse::merge_new_path(int target_bci) {
1538 Block* target = successor_for_bci(target_bci);
1539 if (target == NULL) { handle_missing_successor(target_bci); return; }
1540 assert(!target->is_ready(), "new path into frozen graph");
1541 int pnum = target->add_new_path();
1542 merge_common(target, pnum);
1543 }
1544
1545 //-------------------------merge_exception-------------------------------------
1546 // Merge the current mapping into the basic block starting at bci
1547 // The ex_oop must be pushed on the stack, unlike throw_to_exit.
1548 void Parse::merge_exception(int target_bci) {
1549 assert(sp() == 1, "must have only the throw exception on the stack");
1550 Block* target = successor_for_bci(target_bci);
1551 if (target == NULL) { handle_missing_successor(target_bci); return; }
1552 assert(target->is_handler(), "exceptions are handled by special blocks");
1553 int pnum = target->add_new_path();
1554 merge_common(target, pnum);
1555 }
1556
1557 //--------------------handle_missing_successor---------------------------------
1558 void Parse::handle_missing_successor(int target_bci) {
1559 #ifndef PRODUCT
1560 Block* b = block();
1561 int trap_bci = b->flow()->has_trap()? b->flow()->trap_bci(): -1;
1562 tty->print_cr("### Missing successor at bci:%d for block #%d (trap_bci:%d)", target_bci, b->rpo(), trap_bci);
1563 #endif
1564 ShouldNotReachHere();
1565 }
1566
1567 //--------------------------merge_common---------------------------------------
1568 void Parse::merge_common(Parse::Block* target, int pnum) {
1569 if (TraceOptoParse) {
1570 tty->print("Merging state at block #%d bci:%d", target->rpo(), target->start());
1571 }
1572
1573 // Zap extra stack slots to top
1574 assert(sp() == target->start_sp(), "");
1575 clean_stack(sp());
1576
1577 if (!target->is_merged()) { // No prior mapping at this bci
1578 if (TraceOptoParse) { tty->print(" with empty state"); }
1579
1580 // If this path is dead, do not bother capturing it as a merge.
1581 // It is "as if" we had 1 fewer predecessors from the beginning.
1582 if (stopped()) {
1583 if (TraceOptoParse) tty->print_cr(", but path is dead and doesn't count");
1584 return;
1585 }
1586
1587 // Record that a new block has been merged.
1588 ++_blocks_merged;
1589
1590 // Make a region if we know there are multiple or unpredictable inputs.
1591 // (Also, if this is a plain fall-through, we might see another region,
1592 // which must not be allowed into this block's map.)
1593 if (pnum > PhiNode::Input // Known multiple inputs.
1594 || target->is_handler() // These have unpredictable inputs.
1595 || target->is_loop_head() // Known multiple inputs
1596 || control()->is_Region()) { // We must hide this guy.
1597
1598 int current_bci = bci();
1599 set_parse_bci(target->start()); // Set target bci
1600 if (target->is_SEL_head()) {
1601 DEBUG_ONLY( target->mark_merged_backedge(block()); )
1602 if (target->start() == 0) {
1603 // Add loop predicate for the special case when
1604 // there are backbranches to the method entry.
1605 add_predicate();
1606 }
1607 }
1608 // Add a Region to start the new basic block. Phis will be added
1609 // later lazily.
1610 int edges = target->pred_count();
1611 if (edges < pnum) edges = pnum; // might be a new path!
1612 RegionNode *r = new RegionNode(edges+1);
1613 gvn().set_type(r, Type::CONTROL);
1614 record_for_igvn(r);
1615 // zap all inputs to NULL for debugging (done in Node(uint) constructor)
1616 // for (int j = 1; j < edges+1; j++) { r->init_req(j, NULL); }
1617 r->init_req(pnum, control());
1618 set_control(r);
1619 set_parse_bci(current_bci); // Restore bci
1620 }
1621
1622 // Convert the existing Parser mapping into a mapping at this bci.
1623 store_state_to(target);
1624 assert(target->is_merged(), "do not come here twice");
1625
1626 } else { // Prior mapping at this bci
1627 if (TraceOptoParse) { tty->print(" with previous state"); }
1628 #ifdef ASSERT
1629 if (target->is_SEL_head()) {
1630 target->mark_merged_backedge(block());
1631 }
1632 #endif
1633 // We must not manufacture more phis if the target is already parsed.
1634 bool nophi = target->is_parsed();
1635
1636 SafePointNode* newin = map();// Hang on to incoming mapping
1637 Block* save_block = block(); // Hang on to incoming block;
1638 load_state_from(target); // Get prior mapping
1639
1640 assert(newin->jvms()->locoff() == jvms()->locoff(), "JVMS layouts agree");
1641 assert(newin->jvms()->stkoff() == jvms()->stkoff(), "JVMS layouts agree");
1642 assert(newin->jvms()->monoff() == jvms()->monoff(), "JVMS layouts agree");
1643 assert(newin->jvms()->endoff() == jvms()->endoff(), "JVMS layouts agree");
1644
1645 // Iterate over my current mapping and the old mapping.
1646 // Where different, insert Phi functions.
1647 // Use any existing Phi functions.
1648 assert(control()->is_Region(), "must be merging to a region");
1649 RegionNode* r = control()->as_Region();
1650
1651 // Compute where to merge into
1652 // Merge incoming control path
1653 r->init_req(pnum, newin->control());
1654
1655 if (pnum == 1) { // Last merge for this Region?
1656 if (!block()->flow()->is_irreducible_entry()) {
1657 Node* result = _gvn.transform_no_reclaim(r);
1658 if (r != result && TraceOptoParse) {
1659 tty->print_cr("Block #%d replace %d with %d", block()->rpo(), r->_idx, result->_idx);
1660 }
1661 }
1662 record_for_igvn(r);
1663 }
1664
1665 // Update all the non-control inputs to map:
1666 assert(TypeFunc::Parms == newin->jvms()->locoff(), "parser map should contain only youngest jvms");
1667 bool check_elide_phi = target->is_SEL_backedge(save_block);
1668 for (uint j = 1; j < newin->req(); j++) {
1669 Node* m = map()->in(j); // Current state of target.
1670 Node* n = newin->in(j); // Incoming change to target state.
1671 PhiNode* phi;
1672 if (m->is_Phi() && m->as_Phi()->region() == r)
1673 phi = m->as_Phi();
1674 else
1675 phi = NULL;
1676 if (m != n) { // Different; must merge
1677 switch (j) {
1678 // Frame pointer and Return Address never changes
1679 case TypeFunc::FramePtr:// Drop m, use the original value
1680 case TypeFunc::ReturnAdr:
1681 break;
1682 case TypeFunc::Memory: // Merge inputs to the MergeMem node
1683 assert(phi == NULL, "the merge contains phis, not vice versa");
1684 merge_memory_edges(n->as_MergeMem(), pnum, nophi);
1685 continue;
1686 default: // All normal stuff
1687 if (phi == NULL) {
1688 const JVMState* jvms = map()->jvms();
1689 if (EliminateNestedLocks &&
1690 jvms->is_mon(j) && jvms->is_monitor_box(j)) {
1691 // BoxLock nodes are not commoning.
1692 // Use old BoxLock node as merged box.
1693 assert(newin->jvms()->is_monitor_box(j), "sanity");
1694 // This assert also tests that nodes are BoxLock.
1695 assert(BoxLockNode::same_slot(n, m), "sanity");
1696 C->gvn_replace_by(n, m);
1697 } else if (!check_elide_phi || !target->can_elide_SEL_phi(j)) {
1698 phi = ensure_phi(j, nophi);
1699 }
1700 }
1701 break;
1702 }
1703 }
1704 // At this point, n might be top if:
1705 // - there is no phi (because TypeFlow detected a conflict), or
1706 // - the corresponding control edges is top (a dead incoming path)
1707 // It is a bug if we create a phi which sees a garbage value on a live path.
1708
1709 if (phi != NULL) {
1710 assert(n != top() || r->in(pnum) == top(), "live value must not be garbage");
1711 assert(phi->region() == r, "");
1712 phi->set_req(pnum, n); // Then add 'n' to the merge
1713 if (pnum == PhiNode::Input) {
1714 // Last merge for this Phi.
1715 // So far, Phis have had a reasonable type from ciTypeFlow.
1716 // Now _gvn will join that with the meet of current inputs.
1717 // BOTTOM is never permissible here, 'cause pessimistically
1718 // Phis of pointers cannot lose the basic pointer type.
1719 debug_only(const Type* bt1 = phi->bottom_type());
1720 assert(bt1 != Type::BOTTOM, "should not be building conflict phis");
1721 map()->set_req(j, _gvn.transform_no_reclaim(phi));
1722 debug_only(const Type* bt2 = phi->bottom_type());
1723 assert(bt2->higher_equal_speculative(bt1), "must be consistent with type-flow");
1724 record_for_igvn(phi);
1725 }
1726 }
1727 } // End of for all values to be merged
1728
1729 if (pnum == PhiNode::Input &&
1730 !r->in(0)) { // The occasional useless Region
1731 assert(control() == r, "");
1732 set_control(r->nonnull_req());
1733 }
1734
1735 map()->merge_replaced_nodes_with(newin);
1736
1737 // newin has been subsumed into the lazy merge, and is now dead.
1738 set_block(save_block);
1739
1740 stop(); // done with this guy, for now
1741 }
1742
1743 if (TraceOptoParse) {
1744 tty->print_cr(" on path %d", pnum);
1745 }
1746
1747 // Done with this parser state.
1748 assert(stopped(), "");
1749 }
1750
1751
1752 //--------------------------merge_memory_edges---------------------------------
1753 void Parse::merge_memory_edges(MergeMemNode* n, int pnum, bool nophi) {
1754 // (nophi means we must not create phis, because we already parsed here)
1755 assert(n != NULL, "");
1756 // Merge the inputs to the MergeMems
1757 MergeMemNode* m = merged_memory();
1758
1759 assert(control()->is_Region(), "must be merging to a region");
1760 RegionNode* r = control()->as_Region();
1761
1762 PhiNode* base = NULL;
1763 MergeMemNode* remerge = NULL;
1764 for (MergeMemStream mms(m, n); mms.next_non_empty2(); ) {
1765 Node *p = mms.force_memory();
1766 Node *q = mms.memory2();
1767 if (mms.is_empty() && nophi) {
1768 // Trouble: No new splits allowed after a loop body is parsed.
1769 // Instead, wire the new split into a MergeMem on the backedge.
1770 // The optimizer will sort it out, slicing the phi.
1771 if (remerge == NULL) {
1772 assert(base != NULL, "");
1773 assert(base->in(0) != NULL, "should not be xformed away");
1774 remerge = MergeMemNode::make(base->in(pnum));
1775 gvn().set_type(remerge, Type::MEMORY);
1776 base->set_req(pnum, remerge);
1777 }
1778 remerge->set_memory_at(mms.alias_idx(), q);
1779 continue;
1780 }
1781 assert(!q->is_MergeMem(), "");
1782 PhiNode* phi;
1783 if (p != q) {
1784 phi = ensure_memory_phi(mms.alias_idx(), nophi);
1785 } else {
1786 if (p->is_Phi() && p->as_Phi()->region() == r)
1787 phi = p->as_Phi();
1788 else
1789 phi = NULL;
1790 }
1791 // Insert q into local phi
1792 if (phi != NULL) {
1793 assert(phi->region() == r, "");
1794 p = phi;
1795 phi->set_req(pnum, q);
1796 if (mms.at_base_memory()) {
1797 base = phi; // delay transforming it
1798 } else if (pnum == 1) {
1799 record_for_igvn(phi);
1800 p = _gvn.transform_no_reclaim(phi);
1801 }
1802 mms.set_memory(p);// store back through the iterator
1803 }
1804 }
1805 // Transform base last, in case we must fiddle with remerging.
1806 if (base != NULL && pnum == 1) {
1807 record_for_igvn(base);
1808 m->set_base_memory( _gvn.transform_no_reclaim(base) );
1809 }
1810 }
1811
1812
1813 //------------------------ensure_phis_everywhere-------------------------------
1814 void Parse::ensure_phis_everywhere() {
1815 ensure_phi(TypeFunc::I_O);
1816
1817 // Ensure a phi on all currently known memories.
1818 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) {
1819 ensure_memory_phi(mms.alias_idx());
1820 debug_only(mms.set_memory()); // keep the iterator happy
1821 }
1822
1823 // Note: This is our only chance to create phis for memory slices.
1824 // If we miss a slice that crops up later, it will have to be
1825 // merged into the base-memory phi that we are building here.
1826 // Later, the optimizer will comb out the knot, and build separate
1827 // phi-loops for each memory slice that matters.
1828
1829 // Monitors must nest nicely and not get confused amongst themselves.
1830 // Phi-ify everything up to the monitors, though.
1831 uint monoff = map()->jvms()->monoff();
1832 uint nof_monitors = map()->jvms()->nof_monitors();
1833
1834 assert(TypeFunc::Parms == map()->jvms()->locoff(), "parser map should contain only youngest jvms");
1835 bool check_elide_phi = block()->is_SEL_head();
1836 for (uint i = TypeFunc::Parms; i < monoff; i++) {
1837 if (!check_elide_phi || !block()->can_elide_SEL_phi(i)) {
1838 ensure_phi(i);
1839 }
1840 }
1841
1842 // Even monitors need Phis, though they are well-structured.
1843 // This is true for OSR methods, and also for the rare cases where
1844 // a monitor object is the subject of a replace_in_map operation.
1845 // See bugs 4426707 and 5043395.
1846 for (uint m = 0; m < nof_monitors; m++) {
1847 ensure_phi(map()->jvms()->monitor_obj_offset(m));
1848 }
1849 }
1850
1851
1852 //-----------------------------add_new_path------------------------------------
1853 // Add a previously unaccounted predecessor to this block.
1854 int Parse::Block::add_new_path() {
1855 // If there is no map, return the lowest unused path number.
1856 if (!is_merged()) return pred_count()+1; // there will be a map shortly
1857
1858 SafePointNode* map = start_map();
1859 if (!map->control()->is_Region())
1860 return pred_count()+1; // there may be a region some day
1861 RegionNode* r = map->control()->as_Region();
1862
1863 // Add new path to the region.
1864 uint pnum = r->req();
1865 r->add_req(NULL);
1866
1867 for (uint i = 1; i < map->req(); i++) {
1868 Node* n = map->in(i);
1869 if (i == TypeFunc::Memory) {
1870 // Ensure a phi on all currently known memories.
1871 for (MergeMemStream mms(n->as_MergeMem()); mms.next_non_empty(); ) {
1872 Node* phi = mms.memory();
1873 if (phi->is_Phi() && phi->as_Phi()->region() == r) {
1874 assert(phi->req() == pnum, "must be same size as region");
1875 phi->add_req(NULL);
1876 }
1877 }
1878 } else {
1879 if (n->is_Phi() && n->as_Phi()->region() == r) {
1880 assert(n->req() == pnum, "must be same size as region");
1881 n->add_req(NULL);
1882 }
1883 }
1884 }
1885
1886 return pnum;
1887 }
1888
1889 //------------------------------ensure_phi-------------------------------------
1890 // Turn the idx'th entry of the current map into a Phi
1891 PhiNode *Parse::ensure_phi(int idx, bool nocreate) {
1892 SafePointNode* map = this->map();
1893 Node* region = map->control();
1894 assert(region->is_Region(), "");
1895
1896 Node* o = map->in(idx);
1897 assert(o != NULL, "");
1898
1899 if (o == top()) return NULL; // TOP always merges into TOP
1900
1901 if (o->is_Phi() && o->as_Phi()->region() == region) {
1902 return o->as_Phi();
1903 }
1904
1905 // Now use a Phi here for merging
1906 assert(!nocreate, "Cannot build a phi for a block already parsed.");
1907 const JVMState* jvms = map->jvms();
1908 const Type* t = NULL;
1909 if (jvms->is_loc(idx)) {
1910 t = block()->local_type_at(idx - jvms->locoff());
1911 } else if (jvms->is_stk(idx)) {
1912 t = block()->stack_type_at(idx - jvms->stkoff());
1913 } else if (jvms->is_mon(idx)) {
1914 assert(!jvms->is_monitor_box(idx), "no phis for boxes");
1915 t = TypeInstPtr::BOTTOM; // this is sufficient for a lock object
1916 } else if ((uint)idx < TypeFunc::Parms) {
1917 t = o->bottom_type(); // Type::RETURN_ADDRESS or such-like.
1918 } else {
1919 assert(false, "no type information for this phi");
1920 }
1921
1922 // If the type falls to bottom, then this must be a local that
1923 // is mixing ints and oops or some such. Forcing it to top
1924 // makes it go dead.
1925 if (t == Type::BOTTOM) {
1926 map->set_req(idx, top());
1927 return NULL;
1928 }
1929
1930 // Do not create phis for top either.
1931 // A top on a non-null control flow must be an unused even after the.phi.
1932 if (t == Type::TOP || t == Type::HALF) {
1933 map->set_req(idx, top());
1934 return NULL;
1935 }
1936
1937 PhiNode* phi = PhiNode::make(region, o, t);
1938 gvn().set_type(phi, t);
1939 if (C->do_escape_analysis()) record_for_igvn(phi);
1940 map->set_req(idx, phi);
1941 return phi;
1942 }
1943
1944 //--------------------------ensure_memory_phi----------------------------------
1945 // Turn the idx'th slice of the current memory into a Phi
1946 PhiNode *Parse::ensure_memory_phi(int idx, bool nocreate) {
1947 MergeMemNode* mem = merged_memory();
1948 Node* region = control();
1949 assert(region->is_Region(), "");
1950
1951 Node *o = (idx == Compile::AliasIdxBot)? mem->base_memory(): mem->memory_at(idx);
1952 assert(o != NULL && o != top(), "");
1953
1954 PhiNode* phi;
1955 if (o->is_Phi() && o->as_Phi()->region() == region) {
1956 phi = o->as_Phi();
1957 if (phi == mem->base_memory() && idx >= Compile::AliasIdxRaw) {
1958 // clone the shared base memory phi to make a new memory split
1959 assert(!nocreate, "Cannot build a phi for a block already parsed.");
1960 const Type* t = phi->bottom_type();
1961 const TypePtr* adr_type = C->get_adr_type(idx);
1962 phi = phi->slice_memory(adr_type);
1963 gvn().set_type(phi, t);
1964 }
1965 return phi;
1966 }
1967
1968 // Now use a Phi here for merging
1969 assert(!nocreate, "Cannot build a phi for a block already parsed.");
1970 const Type* t = o->bottom_type();
1971 const TypePtr* adr_type = C->get_adr_type(idx);
1972 phi = PhiNode::make(region, o, t, adr_type);
1973 gvn().set_type(phi, t);
1974 if (idx == Compile::AliasIdxBot)
1975 mem->set_base_memory(phi);
1976 else
1977 mem->set_memory_at(idx, phi);
1978 return phi;
1979 }
1980
1981 //------------------------------call_register_finalizer-----------------------
1982 // Check the klass of the receiver and call register_finalizer if the
1983 // class need finalization.
1984 void Parse::call_register_finalizer() {
1985 Node* receiver = local(0);
1986 assert(receiver != NULL && receiver->bottom_type()->isa_instptr() != NULL,
1987 "must have non-null instance type");
1988
1989 const TypeInstPtr *tinst = receiver->bottom_type()->isa_instptr();
1990 if (tinst != NULL && tinst->klass()->is_loaded() && !tinst->klass_is_exact()) {
1991 // The type isn't known exactly so see if CHA tells us anything.
1992 ciInstanceKlass* ik = tinst->klass()->as_instance_klass();
1993 if (!Dependencies::has_finalizable_subclass(ik)) {
1994 // No finalizable subclasses so skip the dynamic check.
1995 C->dependencies()->assert_has_no_finalizable_subclasses(ik);
1996 return;
1997 }
1998 }
1999
2000 // Insert a dynamic test for whether the instance needs
2001 // finalization. In general this will fold up since the concrete
2002 // class is often visible so the access flags are constant.
2003 Node* klass_addr = basic_plus_adr( receiver, receiver, oopDesc::klass_offset_in_bytes() );
2004 Node* klass = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), klass_addr, TypeInstPtr::KLASS));
2005
2006 Node* access_flags_addr = basic_plus_adr(klass, klass, in_bytes(Klass::access_flags_offset()));
2007 Node* access_flags = make_load(NULL, access_flags_addr, TypeInt::INT, T_INT, MemNode::unordered);
2008
2009 Node* mask = _gvn.transform(new AndINode(access_flags, intcon(JVM_ACC_HAS_FINALIZER)));
2010 Node* check = _gvn.transform(new CmpINode(mask, intcon(0)));
2011 Node* test = _gvn.transform(new BoolNode(check, BoolTest::ne));
2012
2013 IfNode* iff = create_and_map_if(control(), test, PROB_MAX, COUNT_UNKNOWN);
2014
2015 RegionNode* result_rgn = new RegionNode(3);
2016 record_for_igvn(result_rgn);
2017
2018 Node *skip_register = _gvn.transform(new IfFalseNode(iff));
2019 result_rgn->init_req(1, skip_register);
2020
2021 Node *needs_register = _gvn.transform(new IfTrueNode(iff));
2022 set_control(needs_register);
2023 if (stopped()) {
2024 // There is no slow path.
2025 result_rgn->init_req(2, top());
2026 } else {
2027 Node *call = make_runtime_call(RC_NO_LEAF,
2028 OptoRuntime::register_finalizer_Type(),
2029 OptoRuntime::register_finalizer_Java(),
2030 NULL, TypePtr::BOTTOM,
2031 receiver);
2032 make_slow_call_ex(call, env()->Throwable_klass(), true);
2033
2034 Node* fast_io = call->in(TypeFunc::I_O);
2035 Node* fast_mem = call->in(TypeFunc::Memory);
2036 // These two phis are pre-filled with copies of of the fast IO and Memory
2037 Node* io_phi = PhiNode::make(result_rgn, fast_io, Type::ABIO);
2038 Node* mem_phi = PhiNode::make(result_rgn, fast_mem, Type::MEMORY, TypePtr::BOTTOM);
2039
2040 result_rgn->init_req(2, control());
2041 io_phi ->init_req(2, i_o());
2042 mem_phi ->init_req(2, reset_memory());
2043
2044 set_all_memory( _gvn.transform(mem_phi) );
2045 set_i_o( _gvn.transform(io_phi) );
2046 }
2047
2048 set_control( _gvn.transform(result_rgn) );
2049 }
2050
2051 // Add check to deoptimize if RTM state is not ProfileRTM
2052 void Parse::rtm_deopt() {
2053 #if INCLUDE_RTM_OPT
2054 if (C->profile_rtm()) {
2055 assert(C->method() != NULL, "only for normal compilations");
2056 assert(!C->method()->method_data()->is_empty(), "MDO is needed to record RTM state");
2057 assert(depth() == 1, "generate check only for main compiled method");
2058
2059 // Set starting bci for uncommon trap.
2060 set_parse_bci(is_osr_parse() ? osr_bci() : 0);
2061
2062 // Load the rtm_state from the MethodData.
2063 const TypePtr* adr_type = TypeMetadataPtr::make(C->method()->method_data());
2064 Node* mdo = makecon(adr_type);
2065 int offset = MethodData::rtm_state_offset_in_bytes();
2066 Node* adr_node = basic_plus_adr(mdo, mdo, offset);
2067 Node* rtm_state = make_load(control(), adr_node, TypeInt::INT, T_INT, adr_type, MemNode::unordered);
2068
2069 // Separate Load from Cmp by Opaque.
2070 // In expand_macro_nodes() it will be replaced either
2071 // with this load when there are locks in the code
2072 // or with ProfileRTM (cmp->in(2)) otherwise so that
2073 // the check will fold.
2074 Node* profile_state = makecon(TypeInt::make(ProfileRTM));
2075 Node* opq = _gvn.transform( new Opaque3Node(C, rtm_state, Opaque3Node::RTM_OPT) );
2076 Node* chk = _gvn.transform( new CmpINode(opq, profile_state) );
2077 Node* tst = _gvn.transform( new BoolNode(chk, BoolTest::eq) );
2078 // Branch to failure if state was changed
2079 { BuildCutout unless(this, tst, PROB_ALWAYS);
2080 uncommon_trap(Deoptimization::Reason_rtm_state_change,
2081 Deoptimization::Action_make_not_entrant);
2082 }
2083 }
2084 #endif
2085 }
2086
2087 void Parse::decrement_age() {
2088 MethodCounters* mc = method()->ensure_method_counters();
2089 if (mc == NULL) {
2090 C->record_failure("Must have MCs");
2091 return;
2092 }
2093 assert(!is_osr_parse(), "Not doing this for OSRs");
2094
2095 // Set starting bci for uncommon trap.
2096 set_parse_bci(0);
2097
2098 const TypePtr* adr_type = TypeRawPtr::make((address)mc);
2099 Node* mc_adr = makecon(adr_type);
2100 Node* cnt_adr = basic_plus_adr(mc_adr, mc_adr, in_bytes(MethodCounters::nmethod_age_offset()));
2101 Node* cnt = make_load(control(), cnt_adr, TypeInt::INT, T_INT, adr_type, MemNode::unordered);
2102 Node* decr = _gvn.transform(new SubINode(cnt, makecon(TypeInt::ONE)));
2103 store_to_memory(control(), cnt_adr, decr, T_INT, adr_type, MemNode::unordered);
2104 Node *chk = _gvn.transform(new CmpINode(decr, makecon(TypeInt::ZERO)));
2105 Node* tst = _gvn.transform(new BoolNode(chk, BoolTest::gt));
2106 { BuildCutout unless(this, tst, PROB_ALWAYS);
2107 uncommon_trap(Deoptimization::Reason_tenured,
2108 Deoptimization::Action_make_not_entrant);
2109 }
2110 }
2111
2112 //------------------------------return_current---------------------------------
2113 // Append current _map to _exit_return
2114 void Parse::return_current(Node* value) {
2115 if (RegisterFinalizersAtInit &&
2116 method()->intrinsic_id() == vmIntrinsics::_Object_init) {
2117 call_register_finalizer();
2118 }
2119
2120 // Do not set_parse_bci, so that return goo is credited to the return insn.
2121 set_bci(InvocationEntryBci);
2122 if (method()->is_synchronized() && GenerateSynchronizationCode) {
2123 shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node());
2124 }
2125 if (C->env()->dtrace_method_probes()) {
2126 make_dtrace_method_exit(method());
2127 }
2128 SafePointNode* exit_return = _exits.map();
2129 exit_return->in( TypeFunc::Control )->add_req( control() );
2130 exit_return->in( TypeFunc::I_O )->add_req( i_o () );
2131 Node *mem = exit_return->in( TypeFunc::Memory );
2132 for (MergeMemStream mms(mem->as_MergeMem(), merged_memory()); mms.next_non_empty2(); ) {
2133 if (mms.is_empty()) {
2134 // get a copy of the base memory, and patch just this one input
2135 const TypePtr* adr_type = mms.adr_type(C);
2136 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type);
2137 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), "");
2138 gvn().set_type_bottom(phi);
2139 phi->del_req(phi->req()-1); // prepare to re-patch
2140 mms.set_memory(phi);
2141 }
2142 mms.memory()->add_req(mms.memory2());
2143 }
2144
2145 // frame pointer is always same, already captured
2146 if (value != NULL) {
2147 // If returning oops to an interface-return, there is a silent free
2148 // cast from oop to interface allowed by the Verifier. Make it explicit
2149 // here.
2150 Node* phi = _exits.argument(0);
2151 const TypeInstPtr *tr = phi->bottom_type()->isa_instptr();
2152 if (tr && tr->klass()->is_loaded() &&
2153 tr->klass()->is_interface()) {
2154 const TypeInstPtr *tp = value->bottom_type()->isa_instptr();
2155 if (tp && tp->klass()->is_loaded() &&
2156 !tp->klass()->is_interface()) {
2157 // sharpen the type eagerly; this eases certain assert checking
2158 if (tp->higher_equal(TypeInstPtr::NOTNULL))
2159 tr = tr->join_speculative(TypeInstPtr::NOTNULL)->is_instptr();
2160 value = _gvn.transform(new CheckCastPPNode(0, value, tr));
2161 }
2162 } else {
2163 // Also handle returns of oop-arrays to an arrays-of-interface return
2164 const TypeInstPtr* phi_tip;
2165 const TypeInstPtr* val_tip;
2166 Type::get_arrays_base_elements(phi->bottom_type(), value->bottom_type(), &phi_tip, &val_tip);
2167 if (phi_tip != NULL && phi_tip->is_loaded() && phi_tip->klass()->is_interface() &&
2168 val_tip != NULL && val_tip->is_loaded() && !val_tip->klass()->is_interface()) {
2169 value = _gvn.transform(new CheckCastPPNode(0, value, phi->bottom_type()));
2170 }
2171 }
2172 phi->add_req(value);
2173 }
2174
2175 if (_first_return) {
2176 _exits.map()->transfer_replaced_nodes_from(map(), _new_idx);
2177 _first_return = false;
2178 } else {
2179 _exits.map()->merge_replaced_nodes_with(map());
2180 }
2181
2182 stop_and_kill_map(); // This CFG path dies here
2183 }
2184
2185
2186 //------------------------------add_safepoint----------------------------------
2187 void Parse::add_safepoint() {
2188 // See if we can avoid this safepoint. No need for a SafePoint immediately
2189 // after a Call (except Leaf Call) or another SafePoint.
2190 Node *proj = control();
2191 bool add_poll_param = SafePointNode::needs_polling_address_input();
2192 uint parms = add_poll_param ? TypeFunc::Parms+1 : TypeFunc::Parms;
2193 if( proj->is_Proj() ) {
2194 Node *n0 = proj->in(0);
2195 if( n0->is_Catch() ) {
2196 n0 = n0->in(0)->in(0);
2197 assert( n0->is_Call(), "expect a call here" );
2198 }
2199 if( n0->is_Call() ) {
2200 if( n0->as_Call()->guaranteed_safepoint() )
2201 return;
2202 } else if( n0->is_SafePoint() && n0->req() >= parms ) {
2203 return;
2204 }
2205 }
2206
2207 // Clear out dead values from the debug info.
2208 kill_dead_locals();
2209
2210 // Clone the JVM State
2211 SafePointNode *sfpnt = new SafePointNode(parms, NULL);
2212
2213 // Capture memory state BEFORE a SafePoint. Since we can block at a
2214 // SafePoint we need our GC state to be safe; i.e. we need all our current
2215 // write barriers (card marks) to not float down after the SafePoint so we
2216 // must read raw memory. Likewise we need all oop stores to match the card
2217 // marks. If deopt can happen, we need ALL stores (we need the correct JVM
2218 // state on a deopt).
2219
2220 // We do not need to WRITE the memory state after a SafePoint. The control
2221 // edge will keep card-marks and oop-stores from floating up from below a
2222 // SafePoint and our true dependency added here will keep them from floating
2223 // down below a SafePoint.
2224
2225 // Clone the current memory state
2226 Node* mem = MergeMemNode::make(map()->memory());
2227
2228 mem = _gvn.transform(mem);
2229
2230 // Pass control through the safepoint
2231 sfpnt->init_req(TypeFunc::Control , control());
2232 // Fix edges normally used by a call
2233 sfpnt->init_req(TypeFunc::I_O , top() );
2234 sfpnt->init_req(TypeFunc::Memory , mem );
2235 sfpnt->init_req(TypeFunc::ReturnAdr, top() );
2236 sfpnt->init_req(TypeFunc::FramePtr , top() );
2237
2238 // Create a node for the polling address
2239 if( add_poll_param ) {
2240 Node *polladr = ConPNode::make((address)os::get_polling_page());
2241 sfpnt->init_req(TypeFunc::Parms+0, _gvn.transform(polladr));
2242 }
2243
2244 // Fix up the JVM State edges
2245 add_safepoint_edges(sfpnt);
2246 Node *transformed_sfpnt = _gvn.transform(sfpnt);
2247 set_control(transformed_sfpnt);
2248
2249 // Provide an edge from root to safepoint. This makes the safepoint
2250 // appear useful until the parse has completed.
2251 if( OptoRemoveUseless && transformed_sfpnt->is_SafePoint() ) {
2252 assert(C->root() != NULL, "Expect parse is still valid");
2253 C->root()->add_prec(transformed_sfpnt);
2254 }
2255 }
2256
2257 #ifndef PRODUCT
2258 //------------------------show_parse_info--------------------------------------
2259 void Parse::show_parse_info() {
2260 InlineTree* ilt = NULL;
2261 if (C->ilt() != NULL) {
2262 JVMState* caller_jvms = is_osr_parse() ? caller()->caller() : caller();
2263 ilt = InlineTree::find_subtree_from_root(C->ilt(), caller_jvms, method());
2264 }
2265 if (PrintCompilation && Verbose) {
2266 if (depth() == 1) {
2267 if( ilt->count_inlines() ) {
2268 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
2269 ilt->count_inline_bcs());
2270 tty->cr();
2271 }
2272 } else {
2273 if (method()->is_synchronized()) tty->print("s");
2274 if (method()->has_exception_handlers()) tty->print("!");
2275 // Check this is not the final compiled version
2276 if (C->trap_can_recompile()) {
2277 tty->print("-");
2278 } else {
2279 tty->print(" ");
2280 }
2281 method()->print_short_name();
2282 if (is_osr_parse()) {
2283 tty->print(" @ %d", osr_bci());
2284 }
2285 tty->print(" (%d bytes)",method()->code_size());
2286 if (ilt->count_inlines()) {
2287 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
2288 ilt->count_inline_bcs());
2289 }
2290 tty->cr();
2291 }
2292 }
2293 if (PrintOpto && (depth() == 1 || PrintOptoInlining)) {
2294 // Print that we succeeded; suppress this message on the first osr parse.
2295
2296 if (method()->is_synchronized()) tty->print("s");
2297 if (method()->has_exception_handlers()) tty->print("!");
2298 // Check this is not the final compiled version
2299 if (C->trap_can_recompile() && depth() == 1) {
2300 tty->print("-");
2301 } else {
2302 tty->print(" ");
2303 }
2304 if( depth() != 1 ) { tty->print(" "); } // missing compile count
2305 for (int i = 1; i < depth(); ++i) { tty->print(" "); }
2306 method()->print_short_name();
2307 if (is_osr_parse()) {
2308 tty->print(" @ %d", osr_bci());
2309 }
2310 if (ilt->caller_bci() != -1) {
2311 tty->print(" @ %d", ilt->caller_bci());
2312 }
2313 tty->print(" (%d bytes)",method()->code_size());
2314 if (ilt->count_inlines()) {
2315 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
2316 ilt->count_inline_bcs());
2317 }
2318 tty->cr();
2319 }
2320 }
2321
2322
2323 //------------------------------dump-------------------------------------------
2324 // Dump information associated with the bytecodes of current _method
2325 void Parse::dump() {
2326 if( method() != NULL ) {
2327 // Iterate over bytecodes
2328 ciBytecodeStream iter(method());
2329 for( Bytecodes::Code bc = iter.next(); bc != ciBytecodeStream::EOBC() ; bc = iter.next() ) {
2330 dump_bci( iter.cur_bci() );
2331 tty->cr();
2332 }
2333 }
2334 }
2335
2336 // Dump information associated with a byte code index, 'bci'
2337 void Parse::dump_bci(int bci) {
2338 // Output info on merge-points, cloning, and within _jsr..._ret
2339 // NYI
2340 tty->print(" bci:%d", bci);
2341 }
2342
2343 #endif