1 /*
2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/ciReplay.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "compiler/compileLog.hpp"
31 #include "interpreter/linkResolver.hpp"
32 #include "oops/objArrayKlass.hpp"
33 #include "opto/callGenerator.hpp"
34 #include "opto/parse.hpp"
35 #include "runtime/handles.inline.hpp"
36
37 //=============================================================================
38 //------------------------------InlineTree-------------------------------------
39 InlineTree::InlineTree(Compile* c,
40 const InlineTree *caller_tree, ciMethod* callee,
41 JVMState* caller_jvms, int caller_bci,
42 float site_invoke_ratio, int max_inline_level) :
43 C(c),
44 _caller_jvms(caller_jvms),
45 _caller_tree((InlineTree*) caller_tree),
46 _method(callee),
47 _site_invoke_ratio(site_invoke_ratio),
48 _max_inline_level(max_inline_level),
49 _count_inline_bcs(method()->code_size_for_inlining()),
50 _subtrees(c->comp_arena(), 2, 0, NULL),
51 _msg(NULL)
52 {
53 NOT_PRODUCT(_count_inlines = 0;)
54 if (_caller_jvms != NULL) {
55 // Keep a private copy of the caller_jvms:
56 _caller_jvms = new (C) JVMState(caller_jvms->method(), caller_tree->caller_jvms());
57 _caller_jvms->set_bci(caller_jvms->bci());
58 assert(!caller_jvms->should_reexecute(), "there should be no reexecute bytecode with inlining");
59 }
60 assert(_caller_jvms->same_calls_as(caller_jvms), "consistent JVMS");
61 assert((caller_tree == NULL ? 0 : caller_tree->stack_depth() + 1) == stack_depth(), "correct (redundant) depth parameter");
62 assert(caller_bci == this->caller_bci(), "correct (redundant) bci parameter");
63 if (UseOldInlining) {
64 // Update hierarchical counts, count_inline_bcs() and count_inlines()
65 InlineTree *caller = (InlineTree *)caller_tree;
66 for( ; caller != NULL; caller = ((InlineTree *)(caller->caller_tree())) ) {
67 caller->_count_inline_bcs += count_inline_bcs();
68 NOT_PRODUCT(caller->_count_inlines++;)
69 }
70 }
71 }
72
73 InlineTree::InlineTree(Compile* c, ciMethod* callee_method, JVMState* caller_jvms,
74 float site_invoke_ratio, int max_inline_level) :
75 C(c),
76 _caller_jvms(caller_jvms),
77 _caller_tree(NULL),
78 _method(callee_method),
79 _site_invoke_ratio(site_invoke_ratio),
80 _max_inline_level(max_inline_level),
81 _count_inline_bcs(method()->code_size()),
82 _msg(NULL)
83 {
84 NOT_PRODUCT(_count_inlines = 0;)
85 assert(!UseOldInlining, "do not use for old stuff");
86 }
87
88 /**
89 * Return true when EA is ON and a java constructor is called or
90 * a super constructor is called from an inlined java constructor.
91 * Also return true for boxing methods.
92 */
93 static bool is_init_with_ea(ciMethod* callee_method,
94 ciMethod* caller_method, Compile* C) {
95 if (!C->do_escape_analysis() || !EliminateAllocations) {
96 return false; // EA is off
97 }
98 if (callee_method->is_initializer()) {
99 return true; // constuctor
100 }
101 if (caller_method->is_initializer() &&
102 caller_method != C->method() &&
103 caller_method->holder()->is_subclass_of(callee_method->holder())) {
104 return true; // super constructor is called from inlined constructor
105 }
106 if (C->eliminate_boxing() && callee_method->is_boxing_method()) {
107 return true;
108 }
109 return false;
110 }
111
112 /**
113 * Force inlining unboxing accessor.
114 */
115 static bool is_unboxing_method(ciMethod* callee_method, Compile* C) {
116 return C->eliminate_boxing() && callee_method->is_unboxing_method();
117 }
118
119 // positive filter: should callee be inlined?
120 bool InlineTree::should_inline(ciMethod* callee_method, ciMethod* caller_method,
121 int caller_bci, ciCallProfile& profile,
122 WarmCallInfo* wci_result) {
123 // Allows targeted inlining
124 if(callee_method->should_inline()) {
125 *wci_result = *(WarmCallInfo::always_hot());
126 if (PrintInlining && Verbose) {
127 CompileTask::print_inline_indent(inline_level());
128 tty->print_cr("Inlined method is hot: ");
129 }
130 set_msg("force inline by CompilerOracle");
131 return true;
132 }
133
134 int size = callee_method->code_size_for_inlining();
135
136 // Check for too many throws (and not too huge)
137 if(callee_method->interpreter_throwout_count() > InlineThrowCount &&
138 size < InlineThrowMaxSize ) {
139 wci_result->set_profit(wci_result->profit() * 100);
140 if (PrintInlining && Verbose) {
141 CompileTask::print_inline_indent(inline_level());
142 tty->print_cr("Inlined method with many throws (throws=%d):", callee_method->interpreter_throwout_count());
143 }
144 set_msg("many throws");
145 return true;
146 }
147
148 if (!UseOldInlining) {
149 set_msg("!UseOldInlining");
150 return true; // size and frequency are represented in a new way
151 }
152
153 int default_max_inline_size = C->max_inline_size();
154 int inline_small_code_size = InlineSmallCode / 4;
155 int max_inline_size = default_max_inline_size;
156
157 int call_site_count = method()->scale_count(profile.count());
158 int invoke_count = method()->interpreter_invocation_count();
159
160 assert(invoke_count != 0, "require invocation count greater than zero");
161 int freq = call_site_count / invoke_count;
162
163 // bump the max size if the call is frequent
164 if ((freq >= InlineFrequencyRatio) ||
165 (call_site_count >= InlineFrequencyCount) ||
166 is_unboxing_method(callee_method, C) ||
167 is_init_with_ea(callee_method, caller_method, C)) {
168
169 max_inline_size = C->freq_inline_size();
170 if (size <= max_inline_size && TraceFrequencyInlining) {
171 CompileTask::print_inline_indent(inline_level());
172 tty->print_cr("Inlined frequent method (freq=%d count=%d):", freq, call_site_count);
173 CompileTask::print_inline_indent(inline_level());
174 callee_method->print();
175 tty->cr();
176 }
177 } else {
178 // Not hot. Check for medium-sized pre-existing nmethod at cold sites.
179 if (callee_method->has_compiled_code() &&
180 callee_method->instructions_size() > inline_small_code_size) {
181 set_msg("already compiled into a medium method");
182 return false;
183 }
184 }
185 if (size > max_inline_size) {
186 if (max_inline_size > default_max_inline_size) {
187 set_msg("hot method too big");
188 } else {
189 set_msg("too big");
190 }
191 return false;
192 }
193 return true;
194 }
195
196
197 // negative filter: should callee NOT be inlined?
198 bool InlineTree::should_not_inline(ciMethod *callee_method,
199 ciMethod* caller_method,
200 WarmCallInfo* wci_result) {
201
202 const char* fail_msg = NULL;
203
204 // First check all inlining restrictions which are required for correctness
205 if ( callee_method->is_abstract()) {
206 fail_msg = "abstract method"; // // note: we allow ik->is_abstract()
207 } else if (!callee_method->holder()->is_initialized()) {
208 fail_msg = "method holder not initialized";
209 } else if ( callee_method->is_native()) {
210 fail_msg = "native method";
211 } else if ( callee_method->dont_inline()) {
212 fail_msg = "don't inline by annotation";
213 }
214
215 if (!UseOldInlining) {
216 if (fail_msg != NULL) {
217 *wci_result = *(WarmCallInfo::always_cold());
218 set_msg(fail_msg);
219 return true;
220 }
221
222 if (callee_method->has_unloaded_classes_in_signature()) {
223 wci_result->set_profit(wci_result->profit() * 0.1);
224 }
225
226 // don't inline exception code unless the top method belongs to an
227 // exception class
228 if (callee_method->holder()->is_subclass_of(C->env()->Throwable_klass())) {
229 ciMethod* top_method = caller_jvms() ? caller_jvms()->of_depth(1)->method() : method();
230 if (!top_method->holder()->is_subclass_of(C->env()->Throwable_klass())) {
231 wci_result->set_profit(wci_result->profit() * 0.1);
232 }
233 }
234
235 if (callee_method->has_compiled_code() &&
236 callee_method->instructions_size() > InlineSmallCode) {
237 wci_result->set_profit(wci_result->profit() * 0.1);
238 // %%% adjust wci_result->size()?
239 }
240
241 return false;
242 }
243
244 // one more inlining restriction
245 if (fail_msg == NULL && callee_method->has_unloaded_classes_in_signature()) {
246 fail_msg = "unloaded signature classes";
247 }
248
249 if (fail_msg != NULL) {
250 set_msg(fail_msg);
251 return true;
252 }
253
254 // ignore heuristic controls on inlining
255 if (callee_method->should_inline()) {
256 set_msg("force inline by CompilerOracle");
257 return false;
258 }
259
260 if (callee_method->should_not_inline()) {
261 set_msg("disallowed by CompilerOracle");
262 return true;
263 }
264
265 #ifndef PRODUCT
266 if (ciReplay::should_not_inline(callee_method)) {
267 set_msg("disallowed by ciReplay");
268 return true;
269 }
270 #endif
271
272 // Now perform checks which are heuristic
273
274 if (is_unboxing_method(callee_method, C)) {
275 // Inline unboxing methods.
276 return false;
277 }
278
279 if (!callee_method->force_inline()) {
280 if (callee_method->has_compiled_code() &&
281 callee_method->instructions_size() > InlineSmallCode) {
282 set_msg("already compiled into a big method");
283 return true;
284 }
285 }
286
287 // don't inline exception code unless the top method belongs to an
288 // exception class
289 if (caller_tree() != NULL &&
290 callee_method->holder()->is_subclass_of(C->env()->Throwable_klass())) {
291 const InlineTree *top = this;
292 while (top->caller_tree() != NULL) top = top->caller_tree();
293 ciInstanceKlass* k = top->method()->holder();
294 if (!k->is_subclass_of(C->env()->Throwable_klass())) {
295 set_msg("exception method");
296 return true;
297 }
298 }
299
300 if (UseStringCache) {
301 // Do not inline StringCache::profile() method used only at the beginning.
302 if (callee_method->name() == ciSymbol::profile_name() &&
303 callee_method->holder()->name() == ciSymbol::java_lang_StringCache()) {
304 set_msg("profiling method");
305 return true;
306 }
307 }
308
309 // use frequency-based objections only for non-trivial methods
310 if (callee_method->code_size() <= MaxTrivialSize) {
311 return false;
312 }
313
314 // don't use counts with -Xcomp or CTW
315 if (UseInterpreter && !CompileTheWorld) {
316
317 if (!callee_method->has_compiled_code() &&
318 !callee_method->was_executed_more_than(0)) {
319 set_msg("never executed");
320 return true;
321 }
322
323 if (is_init_with_ea(callee_method, caller_method, C)) {
324 // Escape Analysis: inline all executed constructors
325 return false;
326 } else if (!callee_method->was_executed_more_than(MIN2(MinInliningThreshold,
327 CompileThreshold >> 1))) {
328 set_msg("executed < MinInliningThreshold times");
329 return true;
330 }
331 }
332
333 return false;
334 }
335
336 //-----------------------------try_to_inline-----------------------------------
337 // return true if ok
338 // Relocated from "InliningClosure::try_to_inline"
339 bool InlineTree::try_to_inline(ciMethod* callee_method, ciMethod* caller_method,
340 int caller_bci, ciCallProfile& profile,
341 WarmCallInfo* wci_result, bool& should_delay) {
342
343 // Old algorithm had funny accumulating BC-size counters
344 if (UseOldInlining && ClipInlining
345 && (int)count_inline_bcs() >= DesiredMethodLimit) {
346 if (!callee_method->force_inline() || !IncrementalInline) {
347 set_msg("size > DesiredMethodLimit");
348 return false;
349 } else if (!C->inlining_incrementally()) {
350 should_delay = true;
351 }
352 }
353
354 if (!should_inline(callee_method, caller_method, caller_bci, profile,
355 wci_result)) {
356 return false;
357 }
358 if (should_not_inline(callee_method, caller_method, wci_result)) {
359 return false;
360 }
361
362 if (InlineAccessors && callee_method->is_accessor()) {
363 // accessor methods are not subject to any of the following limits.
364 set_msg("accessor");
365 return true;
366 }
367
368 // suppress a few checks for accessors and trivial methods
369 if (callee_method->code_size() > MaxTrivialSize) {
370
371 // don't inline into giant methods
372 if (C->over_inlining_cutoff()) {
373 if ((!callee_method->force_inline() && !caller_method->is_compiled_lambda_form())
374 || !IncrementalInline) {
375 set_msg("NodeCountInliningCutoff");
376 return false;
377 } else {
378 should_delay = true;
379 }
380 }
381
382 if ((!UseInterpreter || CompileTheWorld) &&
383 is_init_with_ea(callee_method, caller_method, C)) {
384
385 // Escape Analysis stress testing when running Xcomp or CTW:
386 // inline constructors even if they are not reached.
387
388 } else if (profile.count() == 0) {
389 // don't inline unreached call sites
390 set_msg("call site not reached");
391 return false;
392 }
393 }
394
395 if (!C->do_inlining() && InlineAccessors) {
396 set_msg("not an accessor");
397 return false;
398 }
399 if (inline_level() > _max_inline_level) {
400 if (!callee_method->force_inline() || !IncrementalInline) {
401 set_msg("inlining too deep");
402 return false;
403 } else if (!C->inlining_incrementally()) {
404 should_delay = true;
405 }
406 }
407
408 // detect direct and indirect recursive inlining
409 if (!callee_method->is_compiled_lambda_form()) {
410 // count the current method and the callee
411 int inline_level = (method() == callee_method) ? 1 : 0;
412 if (inline_level > MaxRecursiveInlineLevel) {
413 set_msg("recursively inlining too deep");
414 return false;
415 }
416 // count callers of current method and callee
417 JVMState* jvms = caller_jvms();
418 while (jvms != NULL && jvms->has_method()) {
419 if (jvms->method() == callee_method) {
420 inline_level++;
421 if (inline_level > MaxRecursiveInlineLevel) {
422 set_msg("recursively inlining too deep");
423 return false;
424 }
425 }
426 jvms = jvms->caller();
427 }
428 }
429
430 int size = callee_method->code_size_for_inlining();
431
432 if (UseOldInlining && ClipInlining
433 && (int)count_inline_bcs() + size >= DesiredMethodLimit) {
434 if (!callee_method->force_inline() || !IncrementalInline) {
435 set_msg("size > DesiredMethodLimit");
436 return false;
437 } else if (!C->inlining_incrementally()) {
438 should_delay = true;
439 }
440 }
441
442 // ok, inline this method
443 return true;
444 }
445
446 //------------------------------pass_initial_checks----------------------------
447 bool pass_initial_checks(ciMethod* caller_method, int caller_bci, ciMethod* callee_method) {
448 ciInstanceKlass *callee_holder = callee_method ? callee_method->holder() : NULL;
449 // Check if a callee_method was suggested
450 if( callee_method == NULL ) return false;
451 // Check if klass of callee_method is loaded
452 if( !callee_holder->is_loaded() ) return false;
453 if( !callee_holder->is_initialized() ) return false;
454 if( !UseInterpreter || CompileTheWorld /* running Xcomp or CTW */ ) {
455 // Checks that constant pool's call site has been visited
456 // stricter than callee_holder->is_initialized()
457 ciBytecodeStream iter(caller_method);
458 iter.force_bci(caller_bci);
459 Bytecodes::Code call_bc = iter.cur_bc();
460 // An invokedynamic instruction does not have a klass.
461 if (call_bc != Bytecodes::_invokedynamic) {
462 int index = iter.get_index_u2_cpcache();
463 if (!caller_method->is_klass_loaded(index, true)) {
464 return false;
465 }
466 // Try to do constant pool resolution if running Xcomp
467 if( !caller_method->check_call(index, call_bc == Bytecodes::_invokestatic) ) {
468 return false;
469 }
470 }
471 }
472 // We will attempt to see if a class/field/etc got properly loaded. If it
473 // did not, it may attempt to throw an exception during our probing. Catch
474 // and ignore such exceptions and do not attempt to compile the method.
475 if( callee_method->should_exclude() ) return false;
476
477 return true;
478 }
479
480 //------------------------------check_can_parse--------------------------------
481 const char* InlineTree::check_can_parse(ciMethod* callee) {
482 // Certain methods cannot be parsed at all:
483 if ( callee->is_native()) return "native method";
484 if ( callee->is_abstract()) return "abstract method";
485 if (!callee->can_be_compiled()) return "not compilable (disabled)";
486 if (!callee->has_balanced_monitors()) return "not compilable (unbalanced monitors)";
487 if ( callee->get_flow_analysis()->failing()) return "not compilable (flow analysis failed)";
488 return NULL;
489 }
490
491 //------------------------------print_inlining---------------------------------
492 void InlineTree::print_inlining(ciMethod* callee_method, int caller_bci,
493 bool success) const {
494 const char* inline_msg = msg();
495 assert(inline_msg != NULL, "just checking");
496 if (C->log() != NULL) {
497 if (success) {
498 C->log()->inline_success(inline_msg);
499 } else {
500 C->log()->inline_fail(inline_msg);
501 }
502 }
503 if (PrintInlining) {
504 C->print_inlining(callee_method, inline_level(), caller_bci, inline_msg);
505 if (callee_method == NULL) tty->print(" callee not monotonic or profiled");
506 if (Verbose && callee_method) {
507 const InlineTree *top = this;
508 while( top->caller_tree() != NULL ) { top = top->caller_tree(); }
509 //tty->print(" bcs: %d+%d invoked: %d", top->count_inline_bcs(), callee_method->code_size(), callee_method->interpreter_invocation_count());
510 }
511 }
512 }
513
514 //------------------------------ok_to_inline-----------------------------------
515 WarmCallInfo* InlineTree::ok_to_inline(ciMethod* callee_method, JVMState* jvms, ciCallProfile& profile, WarmCallInfo* initial_wci, bool& should_delay) {
516 assert(callee_method != NULL, "caller checks for optimized virtual!");
517 assert(!should_delay, "should be initialized to false");
518 #ifdef ASSERT
519 // Make sure the incoming jvms has the same information content as me.
520 // This means that we can eventually make this whole class AllStatic.
521 if (jvms->caller() == NULL) {
522 assert(_caller_jvms == NULL, "redundant instance state");
523 } else {
524 assert(_caller_jvms->same_calls_as(jvms->caller()), "redundant instance state");
525 }
526 assert(_method == jvms->method(), "redundant instance state");
527 #endif
528 int caller_bci = jvms->bci();
529 ciMethod* caller_method = jvms->method();
530
531 // Do some initial checks.
532 if (!pass_initial_checks(caller_method, caller_bci, callee_method)) {
533 set_msg("failed initial checks");
534 print_inlining(callee_method, caller_bci, false /* !success */);
535 return NULL;
536 }
537
538 // Do some parse checks.
539 set_msg(check_can_parse(callee_method));
540 if (msg() != NULL) {
541 print_inlining(callee_method, caller_bci, false /* !success */);
542 return NULL;
543 }
544
545 // Check if inlining policy says no.
546 WarmCallInfo wci = *(initial_wci);
547 bool success = try_to_inline(callee_method, caller_method, caller_bci,
548 profile, &wci, should_delay);
549
550 #ifndef PRODUCT
551 if (UseOldInlining && InlineWarmCalls
552 && (PrintOpto || PrintOptoInlining || PrintInlining)) {
553 bool cold = wci.is_cold();
554 bool hot = !cold && wci.is_hot();
555 bool old_cold = !success;
556 if (old_cold != cold || (Verbose || WizardMode)) {
557 if (msg() == NULL) {
558 set_msg("OK");
559 }
560 tty->print(" OldInlining= %4s : %s\n WCI=",
561 old_cold ? "cold" : "hot", msg());
562 wci.print();
563 }
564 }
565 #endif
566 if (UseOldInlining) {
567 if (success) {
568 wci = *(WarmCallInfo::always_hot());
569 } else {
570 wci = *(WarmCallInfo::always_cold());
571 }
572 }
573 if (!InlineWarmCalls) {
574 if (!wci.is_cold() && !wci.is_hot()) {
575 // Do not inline the warm calls.
576 wci = *(WarmCallInfo::always_cold());
577 }
578 }
579
580 if (!wci.is_cold()) {
581 // Inline!
582 if (msg() == NULL) {
583 set_msg("inline (hot)");
584 }
585 print_inlining(callee_method, caller_bci, true /* success */);
586 if (UseOldInlining)
587 build_inline_tree_for_callee(callee_method, jvms, caller_bci);
588 if (InlineWarmCalls && !wci.is_hot())
589 return new (C) WarmCallInfo(wci); // copy to heap
590 return WarmCallInfo::always_hot();
591 }
592
593 // Do not inline
594 if (msg() == NULL) {
595 set_msg("too cold to inline");
596 }
597 print_inlining(callee_method, caller_bci, false /* !success */ );
598 return NULL;
599 }
600
601 //------------------------------compute_callee_frequency-----------------------
602 float InlineTree::compute_callee_frequency( int caller_bci ) const {
603 int count = method()->interpreter_call_site_count(caller_bci);
604 int invcnt = method()->interpreter_invocation_count();
605 float freq = (float)count/(float)invcnt;
606 // Call-site count / interpreter invocation count, scaled recursively.
607 // Always between 0.0 and 1.0. Represents the percentage of the method's
608 // total execution time used at this call site.
609
610 return freq;
611 }
612
613 //------------------------------build_inline_tree_for_callee-------------------
614 InlineTree *InlineTree::build_inline_tree_for_callee( ciMethod* callee_method, JVMState* caller_jvms, int caller_bci) {
615 float recur_frequency = _site_invoke_ratio * compute_callee_frequency(caller_bci);
616 // Attempt inlining.
617 InlineTree* old_ilt = callee_at(caller_bci, callee_method);
618 if (old_ilt != NULL) {
619 return old_ilt;
620 }
621 int max_inline_level_adjust = 0;
622 if (caller_jvms->method() != NULL) {
623 if (caller_jvms->method()->is_compiled_lambda_form())
624 max_inline_level_adjust += 1; // don't count actions in MH or indy adapter frames
625 else if (callee_method->is_method_handle_intrinsic() ||
626 callee_method->is_compiled_lambda_form()) {
627 max_inline_level_adjust += 1; // don't count method handle calls from java.lang.invoke implem
628 }
629 if (max_inline_level_adjust != 0 && PrintInlining && (Verbose || WizardMode)) {
630 CompileTask::print_inline_indent(inline_level());
631 tty->print_cr(" \\-> discounting inline depth");
632 }
633 if (max_inline_level_adjust != 0 && C->log()) {
634 int id1 = C->log()->identify(caller_jvms->method());
635 int id2 = C->log()->identify(callee_method);
636 C->log()->elem("inline_level_discount caller='%d' callee='%d'", id1, id2);
637 }
638 }
639 InlineTree* ilt = new InlineTree(C, this, callee_method, caller_jvms, caller_bci, recur_frequency, _max_inline_level + max_inline_level_adjust);
640 _subtrees.append(ilt);
641
642 NOT_PRODUCT( _count_inlines += 1; )
643
644 return ilt;
645 }
646
647
648 //---------------------------------------callee_at-----------------------------
649 InlineTree *InlineTree::callee_at(int bci, ciMethod* callee) const {
650 for (int i = 0; i < _subtrees.length(); i++) {
651 InlineTree* sub = _subtrees.at(i);
652 if (sub->caller_bci() == bci && callee == sub->method()) {
653 return sub;
654 }
655 }
656 return NULL;
657 }
658
659
660 //------------------------------build_inline_tree_root-------------------------
661 InlineTree *InlineTree::build_inline_tree_root() {
662 Compile* C = Compile::current();
663
664 // Root of inline tree
665 InlineTree* ilt = new InlineTree(C, NULL, C->method(), NULL, -1, 1.0F, MaxInlineLevel);
666
667 return ilt;
668 }
669
670
671 //-------------------------find_subtree_from_root-----------------------------
672 // Given a jvms, which determines a call chain from the root method,
673 // find the corresponding inline tree.
674 // Note: This method will be removed or replaced as InlineTree goes away.
675 InlineTree* InlineTree::find_subtree_from_root(InlineTree* root, JVMState* jvms, ciMethod* callee) {
676 InlineTree* iltp = root;
677 uint depth = jvms && jvms->has_method() ? jvms->depth() : 0;
678 for (uint d = 1; d <= depth; d++) {
679 JVMState* jvmsp = jvms->of_depth(d);
680 // Select the corresponding subtree for this bci.
681 assert(jvmsp->method() == iltp->method(), "tree still in sync");
682 ciMethod* d_callee = (d == depth) ? callee : jvms->of_depth(d+1)->method();
683 InlineTree* sub = iltp->callee_at(jvmsp->bci(), d_callee);
684 if (sub == NULL) {
685 if (d == depth) {
686 sub = iltp->build_inline_tree_for_callee(d_callee, jvmsp, jvmsp->bci());
687 }
688 guarantee(sub != NULL, "should be a sub-ilt here");
689 return sub;
690 }
691 iltp = sub;
692 }
693 return iltp;
694 }
695
696
697
698 #ifndef PRODUCT
699 void InlineTree::print_impl(outputStream* st, int indent) const {
700 for (int i = 0; i < indent; i++) st->print(" ");
701 st->print(" @ %d ", caller_bci());
702 method()->print_short_name(st);
703 st->cr();
704
705 for (int i = 0 ; i < _subtrees.length(); i++) {
706 _subtrees.at(i)->print_impl(st, indent + 2);
707 }
708 }
709
710 void InlineTree::print_value_on(outputStream* st) const {
711 print_impl(st, 2);
712 }
713 #endif