1 /*
2 * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/bcEscapeAnalyzer.hpp"
27 #include "ci/ciCallSite.hpp"
28 #include "ci/ciObjArray.hpp"
29 #include "ci/ciMemberName.hpp"
30 #include "ci/ciMethodHandle.hpp"
31 #include "classfile/javaClasses.hpp"
32 #include "compiler/compileLog.hpp"
33 #include "opto/addnode.hpp"
34 #include "opto/callGenerator.hpp"
35 #include "opto/callnode.hpp"
36 #include "opto/castnode.hpp"
37 #include "opto/cfgnode.hpp"
38 #include "opto/parse.hpp"
39 #include "opto/rootnode.hpp"
40 #include "opto/runtime.hpp"
41 #include "opto/subnode.hpp"
42 #include "runtime/sharedRuntime.hpp"
43
44 // Utility function.
45 const TypeFunc* CallGenerator::tf() const {
46 return TypeFunc::make(method());
47 }
48
49 bool CallGenerator::is_inlined_method_handle_intrinsic(JVMState* jvms, ciMethod* callee) {
50 ciMethod* symbolic_info = jvms->method()->get_method_at_bci(jvms->bci());
51 return symbolic_info->is_method_handle_intrinsic() && !callee->is_method_handle_intrinsic();
52 }
53
54 //-----------------------------ParseGenerator---------------------------------
55 // Internal class which handles all direct bytecode traversal.
56 class ParseGenerator : public InlineCallGenerator {
57 private:
58 bool _is_osr;
59 float _expected_uses;
60
61 public:
62 ParseGenerator(ciMethod* method, float expected_uses, bool is_osr = false)
63 : InlineCallGenerator(method)
64 {
65 _is_osr = is_osr;
66 _expected_uses = expected_uses;
67 assert(InlineTree::check_can_parse(method) == NULL, "parse must be possible");
68 }
69
70 virtual bool is_parse() const { return true; }
71 virtual JVMState* generate(JVMState* jvms);
72 int is_osr() { return _is_osr; }
73
74 };
75
76 JVMState* ParseGenerator::generate(JVMState* jvms) {
77 Compile* C = Compile::current();
78 C->print_inlining_update(this);
79
80 if (is_osr()) {
81 // The JVMS for a OSR has a single argument (see its TypeFunc).
82 assert(jvms->depth() == 1, "no inline OSR");
83 }
84
85 if (C->failing()) {
86 return NULL; // bailing out of the compile; do not try to parse
87 }
88
89 Parse parser(jvms, method(), _expected_uses);
90 // Grab signature for matching/allocation
91 #ifdef ASSERT
92 if (parser.tf() != (parser.depth() == 1 ? C->tf() : tf())) {
93 MutexLockerEx ml(Compile_lock, Mutex::_no_safepoint_check_flag);
94 assert(C->env()->system_dictionary_modification_counter_changed(),
95 "Must invalidate if TypeFuncs differ");
96 }
97 #endif
98
99 GraphKit& exits = parser.exits();
100
101 if (C->failing()) {
102 while (exits.pop_exception_state() != NULL) ;
103 return NULL;
104 }
105
106 assert(exits.jvms()->same_calls_as(jvms), "sanity");
107
108 // Simply return the exit state of the parser,
109 // augmented by any exceptional states.
110 return exits.transfer_exceptions_into_jvms();
111 }
112
113 //---------------------------DirectCallGenerator------------------------------
114 // Internal class which handles all out-of-line calls w/o receiver type checks.
115 class DirectCallGenerator : public CallGenerator {
116 private:
117 CallStaticJavaNode* _call_node;
118 // Force separate memory and I/O projections for the exceptional
119 // paths to facilitate late inlinig.
120 bool _separate_io_proj;
121
122 public:
123 DirectCallGenerator(ciMethod* method, bool separate_io_proj)
124 : CallGenerator(method),
125 _separate_io_proj(separate_io_proj)
126 {
127 }
128 virtual JVMState* generate(JVMState* jvms);
129
130 CallStaticJavaNode* call_node() const { return _call_node; }
131 };
132
133 JVMState* DirectCallGenerator::generate(JVMState* jvms) {
134 GraphKit kit(jvms);
135 kit.C->print_inlining_update(this);
136 bool is_static = method()->is_static();
137 address target = is_static ? SharedRuntime::get_resolve_static_call_stub()
138 : SharedRuntime::get_resolve_opt_virtual_call_stub();
139
140 if (kit.C->log() != NULL) {
141 kit.C->log()->elem("direct_call bci='%d'", jvms->bci());
142 }
143
144 CallStaticJavaNode *call = new CallStaticJavaNode(kit.C, tf(), target, method(), kit.bci());
145 if (is_inlined_method_handle_intrinsic(jvms, method())) {
146 // To be able to issue a direct call and skip a call to MH.linkTo*/invokeBasic adapter,
147 // additional information about the method being invoked should be attached
148 // to the call site to make resolution logic work
149 // (see SharedRuntime::resolve_static_call_C).
150 call->set_override_symbolic_info(true);
151 }
152 _call_node = call; // Save the call node in case we need it later
153 if (!is_static) {
154 // Make an explicit receiver null_check as part of this call.
155 // Since we share a map with the caller, his JVMS gets adjusted.
156 kit.null_check_receiver_before_call(method());
157 if (kit.stopped()) {
158 // And dump it back to the caller, decorated with any exceptions:
159 return kit.transfer_exceptions_into_jvms();
160 }
161 // Mark the call node as virtual, sort of:
162 call->set_optimized_virtual(true);
163 if (method()->is_method_handle_intrinsic() ||
164 method()->is_compiled_lambda_form()) {
165 call->set_method_handle_invoke(true);
166 }
167 }
168 kit.set_arguments_for_java_call(call);
169 kit.set_edges_for_java_call(call, false, _separate_io_proj);
170 Node* ret = kit.set_results_for_java_call(call, _separate_io_proj);
171 kit.push_node(method()->return_type()->basic_type(), ret);
172 return kit.transfer_exceptions_into_jvms();
173 }
174
175 //--------------------------VirtualCallGenerator------------------------------
176 // Internal class which handles all out-of-line calls checking receiver type.
177 class VirtualCallGenerator : public CallGenerator {
178 private:
179 int _vtable_index;
180 public:
181 VirtualCallGenerator(ciMethod* method, int vtable_index)
182 : CallGenerator(method), _vtable_index(vtable_index)
183 {
184 assert(vtable_index == Method::invalid_vtable_index ||
185 vtable_index >= 0, "either invalid or usable");
186 }
187 virtual bool is_virtual() const { return true; }
188 virtual JVMState* generate(JVMState* jvms);
189 };
190
191 JVMState* VirtualCallGenerator::generate(JVMState* jvms) {
192 GraphKit kit(jvms);
193 Node* receiver = kit.argument(0);
194
195 kit.C->print_inlining_update(this);
196
197 if (kit.C->log() != NULL) {
198 kit.C->log()->elem("virtual_call bci='%d'", jvms->bci());
199 }
200
201 // If the receiver is a constant null, do not torture the system
202 // by attempting to call through it. The compile will proceed
203 // correctly, but may bail out in final_graph_reshaping, because
204 // the call instruction will have a seemingly deficient out-count.
205 // (The bailout says something misleading about an "infinite loop".)
206 if (kit.gvn().type(receiver)->higher_equal(TypePtr::NULL_PTR)) {
207 assert(Bytecodes::is_invoke(kit.java_bc()), "%d: %s", kit.java_bc(), Bytecodes::name(kit.java_bc()));
208 ciMethod* declared_method = kit.method()->get_method_at_bci(kit.bci());
209 int arg_size = declared_method->signature()->arg_size_for_bc(kit.java_bc());
210 kit.inc_sp(arg_size); // restore arguments
211 kit.uncommon_trap(Deoptimization::Reason_null_check,
212 Deoptimization::Action_none,
213 NULL, "null receiver");
214 return kit.transfer_exceptions_into_jvms();
215 }
216
217 // Ideally we would unconditionally do a null check here and let it
218 // be converted to an implicit check based on profile information.
219 // However currently the conversion to implicit null checks in
220 // Block::implicit_null_check() only looks for loads and stores, not calls.
221 ciMethod *caller = kit.method();
222 ciMethodData *caller_md = (caller == NULL) ? NULL : caller->method_data();
223 if (!UseInlineCaches || !ImplicitNullChecks || !os::zero_page_read_protected() ||
224 ((ImplicitNullCheckThreshold > 0) && caller_md &&
225 (caller_md->trap_count(Deoptimization::Reason_null_check)
226 >= (uint)ImplicitNullCheckThreshold))) {
227 // Make an explicit receiver null_check as part of this call.
228 // Since we share a map with the caller, his JVMS gets adjusted.
229 receiver = kit.null_check_receiver_before_call(method());
230 if (kit.stopped()) {
231 // And dump it back to the caller, decorated with any exceptions:
232 return kit.transfer_exceptions_into_jvms();
233 }
234 }
235
236 assert(!method()->is_static(), "virtual call must not be to static");
237 assert(!method()->is_final(), "virtual call should not be to final");
238 assert(!method()->is_private(), "virtual call should not be to private");
239 assert(_vtable_index == Method::invalid_vtable_index || !UseInlineCaches,
240 "no vtable calls if +UseInlineCaches ");
241 address target = SharedRuntime::get_resolve_virtual_call_stub();
242 // Normal inline cache used for call
243 CallDynamicJavaNode *call = new CallDynamicJavaNode(tf(), target, method(), _vtable_index, kit.bci());
244 if (is_inlined_method_handle_intrinsic(jvms, method())) {
245 // To be able to issue a direct call (optimized virtual or virtual)
246 // and skip a call to MH.linkTo*/invokeBasic adapter, additional information
247 // about the method being invoked should be attached to the call site to
248 // make resolution logic work (see SharedRuntime::resolve_{virtual,opt_virtual}_call_C).
249 call->set_override_symbolic_info(true);
250 }
251 kit.set_arguments_for_java_call(call);
252 kit.set_edges_for_java_call(call);
253 Node* ret = kit.set_results_for_java_call(call);
254 kit.push_node(method()->return_type()->basic_type(), ret);
255
256 // Represent the effect of an implicit receiver null_check
257 // as part of this call. Since we share a map with the caller,
258 // his JVMS gets adjusted.
259 kit.cast_not_null(receiver);
260 return kit.transfer_exceptions_into_jvms();
261 }
262
263 CallGenerator* CallGenerator::for_inline(ciMethod* m, float expected_uses) {
264 if (InlineTree::check_can_parse(m) != NULL) return NULL;
265 return new ParseGenerator(m, expected_uses);
266 }
267
268 // As a special case, the JVMS passed to this CallGenerator is
269 // for the method execution already in progress, not just the JVMS
270 // of the caller. Thus, this CallGenerator cannot be mixed with others!
271 CallGenerator* CallGenerator::for_osr(ciMethod* m, int osr_bci) {
272 if (InlineTree::check_can_parse(m) != NULL) return NULL;
273 float past_uses = m->interpreter_invocation_count();
274 float expected_uses = past_uses;
275 return new ParseGenerator(m, expected_uses, true);
276 }
277
278 CallGenerator* CallGenerator::for_direct_call(ciMethod* m, bool separate_io_proj) {
279 assert(!m->is_abstract(), "for_direct_call mismatch");
280 return new DirectCallGenerator(m, separate_io_proj);
281 }
282
283 CallGenerator* CallGenerator::for_virtual_call(ciMethod* m, int vtable_index) {
284 assert(!m->is_static(), "for_virtual_call mismatch");
285 assert(!m->is_method_handle_intrinsic(), "should be a direct call");
286 return new VirtualCallGenerator(m, vtable_index);
287 }
288
289 // Allow inlining decisions to be delayed
290 class LateInlineCallGenerator : public DirectCallGenerator {
291 private:
292 // unique id for log compilation
293 jlong _unique_id;
294
295 protected:
296 CallGenerator* _inline_cg;
297 virtual bool do_late_inline_check(JVMState* jvms) { return true; }
298
299 public:
300 LateInlineCallGenerator(ciMethod* method, CallGenerator* inline_cg) :
301 DirectCallGenerator(method, true), _inline_cg(inline_cg), _unique_id(0) {}
302
303 virtual bool is_late_inline() const { return true; }
304
305 // Convert the CallStaticJava into an inline
306 virtual void do_late_inline();
307
308 virtual JVMState* generate(JVMState* jvms) {
309 Compile *C = Compile::current();
310
311 C->log_inline_id(this);
312
313 // Record that this call site should be revisited once the main
314 // parse is finished.
315 if (!is_mh_late_inline()) {
316 C->add_late_inline(this);
317 }
318
319 // Emit the CallStaticJava and request separate projections so
320 // that the late inlining logic can distinguish between fall
321 // through and exceptional uses of the memory and io projections
322 // as is done for allocations and macro expansion.
323 return DirectCallGenerator::generate(jvms);
324 }
325
326 virtual void print_inlining_late(const char* msg) {
327 CallNode* call = call_node();
328 Compile* C = Compile::current();
329 C->print_inlining_assert_ready();
330 C->print_inlining(method(), call->jvms()->depth()-1, call->jvms()->bci(), msg);
331 C->print_inlining_move_to(this);
332 C->print_inlining_update_delayed(this);
333 }
334
335 virtual void set_unique_id(jlong id) {
336 _unique_id = id;
337 }
338
339 virtual jlong unique_id() const {
340 return _unique_id;
341 }
342 };
343
344 void LateInlineCallGenerator::do_late_inline() {
345 // Can't inline it
346 CallStaticJavaNode* call = call_node();
347 if (call == NULL || call->outcnt() == 0 ||
348 call->in(0) == NULL || call->in(0)->is_top()) {
349 return;
350 }
351
352 const TypeTuple *r = call->tf()->domain();
353 for (int i1 = 0; i1 < method()->arg_size(); i1++) {
354 if (call->in(TypeFunc::Parms + i1)->is_top() && r->field_at(TypeFunc::Parms + i1) != Type::HALF) {
355 assert(Compile::current()->inlining_incrementally(), "shouldn't happen during parsing");
356 return;
357 }
358 }
359
360 if (call->in(TypeFunc::Memory)->is_top()) {
361 assert(Compile::current()->inlining_incrementally(), "shouldn't happen during parsing");
362 return;
363 }
364
365 Compile* C = Compile::current();
366 // Remove inlined methods from Compiler's lists.
367 if (call->is_macro()) {
368 C->remove_macro_node(call);
369 }
370
371 // Make a clone of the JVMState that appropriate to use for driving a parse
372 JVMState* old_jvms = call->jvms();
373 JVMState* jvms = old_jvms->clone_shallow(C);
374 uint size = call->req();
375 SafePointNode* map = new SafePointNode(size, jvms);
376 for (uint i1 = 0; i1 < size; i1++) {
377 map->init_req(i1, call->in(i1));
378 }
379
380 // Make sure the state is a MergeMem for parsing.
381 if (!map->in(TypeFunc::Memory)->is_MergeMem()) {
382 Node* mem = MergeMemNode::make(map->in(TypeFunc::Memory));
383 C->initial_gvn()->set_type_bottom(mem);
384 map->set_req(TypeFunc::Memory, mem);
385 }
386
387 uint nargs = method()->arg_size();
388 // blow away old call arguments
389 Node* top = C->top();
390 for (uint i1 = 0; i1 < nargs; i1++) {
391 map->set_req(TypeFunc::Parms + i1, top);
392 }
393 jvms->set_map(map);
394
395 // Make enough space in the expression stack to transfer
396 // the incoming arguments and return value.
397 map->ensure_stack(jvms, jvms->method()->max_stack());
398 for (uint i1 = 0; i1 < nargs; i1++) {
399 map->set_argument(jvms, i1, call->in(TypeFunc::Parms + i1));
400 }
401
402 C->print_inlining_assert_ready();
403
404 C->print_inlining_move_to(this);
405
406 C->log_late_inline(this);
407
408 // This check is done here because for_method_handle_inline() method
409 // needs jvms for inlined state.
410 if (!do_late_inline_check(jvms)) {
411 map->disconnect_inputs(NULL, C);
412 return;
413 }
414
415 // Setup default node notes to be picked up by the inlining
416 Node_Notes* old_nn = C->node_notes_at(call->_idx);
417 if (old_nn != NULL) {
418 Node_Notes* entry_nn = old_nn->clone(C);
419 entry_nn->set_jvms(jvms);
420 C->set_default_node_notes(entry_nn);
421 }
422
423 // Now perform the inlining using the synthesized JVMState
424 JVMState* new_jvms = _inline_cg->generate(jvms);
425 if (new_jvms == NULL) return; // no change
426 if (C->failing()) return;
427
428 // Capture any exceptional control flow
429 GraphKit kit(new_jvms);
430
431 // Find the result object
432 Node* result = C->top();
433 int result_size = method()->return_type()->size();
434 if (result_size != 0 && !kit.stopped()) {
435 result = (result_size == 1) ? kit.pop() : kit.pop_pair();
436 }
437
438 C->set_has_loops(C->has_loops() || _inline_cg->method()->has_loops());
439 C->env()->notice_inlined_method(_inline_cg->method());
440 C->set_inlining_progress(true);
441
442 kit.replace_call(call, result, true);
443 }
444
445
446 CallGenerator* CallGenerator::for_late_inline(ciMethod* method, CallGenerator* inline_cg) {
447 return new LateInlineCallGenerator(method, inline_cg);
448 }
449
450 class LateInlineMHCallGenerator : public LateInlineCallGenerator {
451 ciMethod* _caller;
452 int _attempt;
453 bool _input_not_const;
454
455 virtual bool do_late_inline_check(JVMState* jvms);
456 virtual bool already_attempted() const { return _attempt > 0; }
457
458 public:
459 LateInlineMHCallGenerator(ciMethod* caller, ciMethod* callee, bool input_not_const) :
460 LateInlineCallGenerator(callee, NULL), _caller(caller), _attempt(0), _input_not_const(input_not_const) {}
461
462 virtual bool is_mh_late_inline() const { return true; }
463
464 virtual JVMState* generate(JVMState* jvms) {
465 JVMState* new_jvms = LateInlineCallGenerator::generate(jvms);
466
467 Compile* C = Compile::current();
468 if (_input_not_const) {
469 // inlining won't be possible so no need to enqueue right now.
470 call_node()->set_generator(this);
471 } else {
472 C->add_late_inline(this);
473 }
474 return new_jvms;
475 }
476 };
477
478 bool LateInlineMHCallGenerator::do_late_inline_check(JVMState* jvms) {
479
480 CallGenerator* cg = for_method_handle_inline(jvms, _caller, method(), _input_not_const);
481
482 Compile::current()->print_inlining_update_delayed(this);
483
484 if (!_input_not_const) {
485 _attempt++;
486 }
487
488 if (cg != NULL && cg->is_inline()) {
489 assert(!cg->is_late_inline(), "we're doing late inlining");
490 _inline_cg = cg;
491 Compile::current()->dec_number_of_mh_late_inlines();
492 return true;
493 }
494
495 call_node()->set_generator(this);
496 return false;
497 }
498
499 CallGenerator* CallGenerator::for_mh_late_inline(ciMethod* caller, ciMethod* callee, bool input_not_const) {
500 Compile::current()->inc_number_of_mh_late_inlines();
501 CallGenerator* cg = new LateInlineMHCallGenerator(caller, callee, input_not_const);
502 return cg;
503 }
504
505 class LateInlineStringCallGenerator : public LateInlineCallGenerator {
506
507 public:
508 LateInlineStringCallGenerator(ciMethod* method, CallGenerator* inline_cg) :
509 LateInlineCallGenerator(method, inline_cg) {}
510
511 virtual JVMState* generate(JVMState* jvms) {
512 Compile *C = Compile::current();
513
514 C->log_inline_id(this);
515
516 C->add_string_late_inline(this);
517
518 JVMState* new_jvms = DirectCallGenerator::generate(jvms);
519 return new_jvms;
520 }
521
522 virtual bool is_string_late_inline() const { return true; }
523 };
524
525 CallGenerator* CallGenerator::for_string_late_inline(ciMethod* method, CallGenerator* inline_cg) {
526 return new LateInlineStringCallGenerator(method, inline_cg);
527 }
528
529 class LateInlineBoxingCallGenerator : public LateInlineCallGenerator {
530
531 public:
532 LateInlineBoxingCallGenerator(ciMethod* method, CallGenerator* inline_cg) :
533 LateInlineCallGenerator(method, inline_cg) {}
534
535 virtual JVMState* generate(JVMState* jvms) {
536 Compile *C = Compile::current();
537
538 C->log_inline_id(this);
539
540 C->add_boxing_late_inline(this);
541
542 JVMState* new_jvms = DirectCallGenerator::generate(jvms);
543 return new_jvms;
544 }
545 };
546
547 CallGenerator* CallGenerator::for_boxing_late_inline(ciMethod* method, CallGenerator* inline_cg) {
548 return new LateInlineBoxingCallGenerator(method, inline_cg);
549 }
550
551 //---------------------------WarmCallGenerator--------------------------------
552 // Internal class which handles initial deferral of inlining decisions.
553 class WarmCallGenerator : public CallGenerator {
554 WarmCallInfo* _call_info;
555 CallGenerator* _if_cold;
556 CallGenerator* _if_hot;
557 bool _is_virtual; // caches virtuality of if_cold
558 bool _is_inline; // caches inline-ness of if_hot
559
560 public:
561 WarmCallGenerator(WarmCallInfo* ci,
562 CallGenerator* if_cold,
563 CallGenerator* if_hot)
564 : CallGenerator(if_cold->method())
565 {
566 assert(method() == if_hot->method(), "consistent choices");
567 _call_info = ci;
568 _if_cold = if_cold;
569 _if_hot = if_hot;
570 _is_virtual = if_cold->is_virtual();
571 _is_inline = if_hot->is_inline();
572 }
573
574 virtual bool is_inline() const { return _is_inline; }
575 virtual bool is_virtual() const { return _is_virtual; }
576 virtual bool is_deferred() const { return true; }
577
578 virtual JVMState* generate(JVMState* jvms);
579 };
580
581
582 CallGenerator* CallGenerator::for_warm_call(WarmCallInfo* ci,
583 CallGenerator* if_cold,
584 CallGenerator* if_hot) {
585 return new WarmCallGenerator(ci, if_cold, if_hot);
586 }
587
588 JVMState* WarmCallGenerator::generate(JVMState* jvms) {
589 Compile* C = Compile::current();
590 C->print_inlining_update(this);
591
592 if (C->log() != NULL) {
593 C->log()->elem("warm_call bci='%d'", jvms->bci());
594 }
595 jvms = _if_cold->generate(jvms);
596 if (jvms != NULL) {
597 Node* m = jvms->map()->control();
598 if (m->is_CatchProj()) m = m->in(0); else m = C->top();
599 if (m->is_Catch()) m = m->in(0); else m = C->top();
600 if (m->is_Proj()) m = m->in(0); else m = C->top();
601 if (m->is_CallJava()) {
602 _call_info->set_call(m->as_Call());
603 _call_info->set_hot_cg(_if_hot);
604 #ifndef PRODUCT
605 if (PrintOpto || PrintOptoInlining) {
606 tty->print_cr("Queueing for warm inlining at bci %d:", jvms->bci());
607 tty->print("WCI: ");
608 _call_info->print();
609 }
610 #endif
611 _call_info->set_heat(_call_info->compute_heat());
612 C->set_warm_calls(_call_info->insert_into(C->warm_calls()));
613 }
614 }
615 return jvms;
616 }
617
618 void WarmCallInfo::make_hot() {
619 Unimplemented();
620 }
621
622 void WarmCallInfo::make_cold() {
623 // No action: Just dequeue.
624 }
625
626
627 //------------------------PredictedCallGenerator------------------------------
628 // Internal class which handles all out-of-line calls checking receiver type.
629 class PredictedCallGenerator : public CallGenerator {
630 ciKlass* _predicted_receiver;
631 CallGenerator* _if_missed;
632 CallGenerator* _if_hit;
633 float _hit_prob;
634 bool _exact_check;
635
636 public:
637 PredictedCallGenerator(ciKlass* predicted_receiver,
638 CallGenerator* if_missed,
639 CallGenerator* if_hit, bool exact_check,
640 float hit_prob)
641 : CallGenerator(if_missed->method())
642 {
643 // The call profile data may predict the hit_prob as extreme as 0 or 1.
644 // Remove the extremes values from the range.
645 if (hit_prob > PROB_MAX) hit_prob = PROB_MAX;
646 if (hit_prob < PROB_MIN) hit_prob = PROB_MIN;
647
648 _predicted_receiver = predicted_receiver;
649 _if_missed = if_missed;
650 _if_hit = if_hit;
651 _hit_prob = hit_prob;
652 _exact_check = exact_check;
653 }
654
655 virtual bool is_virtual() const { return true; }
656 virtual bool is_inline() const { return _if_hit->is_inline(); }
657 virtual bool is_deferred() const { return _if_hit->is_deferred(); }
658
659 virtual JVMState* generate(JVMState* jvms);
660 };
661
662
663 CallGenerator* CallGenerator::for_predicted_call(ciKlass* predicted_receiver,
664 CallGenerator* if_missed,
665 CallGenerator* if_hit,
666 float hit_prob) {
667 return new PredictedCallGenerator(predicted_receiver, if_missed, if_hit,
668 /*exact_check=*/true, hit_prob);
669 }
670
671 CallGenerator* CallGenerator::for_guarded_call(ciKlass* guarded_receiver,
672 CallGenerator* if_missed,
673 CallGenerator* if_hit) {
674 return new PredictedCallGenerator(guarded_receiver, if_missed, if_hit,
675 /*exact_check=*/false, PROB_ALWAYS);
676 }
677
678 JVMState* PredictedCallGenerator::generate(JVMState* jvms) {
679 GraphKit kit(jvms);
680 kit.C->print_inlining_update(this);
681 PhaseGVN& gvn = kit.gvn();
682 // We need an explicit receiver null_check before checking its type.
683 // We share a map with the caller, so his JVMS gets adjusted.
684 Node* receiver = kit.argument(0);
685 CompileLog* log = kit.C->log();
686 if (log != NULL) {
687 log->elem("predicted_call bci='%d' exact='%d' klass='%d'",
688 jvms->bci(), (_exact_check ? 1 : 0), log->identify(_predicted_receiver));
689 }
690
691 receiver = kit.null_check_receiver_before_call(method());
692 if (kit.stopped()) {
693 return kit.transfer_exceptions_into_jvms();
694 }
695
696 // Make a copy of the replaced nodes in case we need to restore them
697 ReplacedNodes replaced_nodes = kit.map()->replaced_nodes();
698 replaced_nodes.clone();
699
700 Node* casted_receiver = receiver; // will get updated in place...
701 Node* slow_ctl = NULL;
702 if (_exact_check) {
703 slow_ctl = kit.type_check_receiver(receiver, _predicted_receiver, _hit_prob,
704 &casted_receiver);
705 } else {
706 slow_ctl = kit.subtype_check_receiver(receiver, _predicted_receiver,
707 &casted_receiver);
708 }
709
710 SafePointNode* slow_map = NULL;
711 JVMState* slow_jvms = NULL;
712 { PreserveJVMState pjvms(&kit);
713 kit.set_control(slow_ctl);
714 if (!kit.stopped()) {
715 slow_jvms = _if_missed->generate(kit.sync_jvms());
716 if (kit.failing())
717 return NULL; // might happen because of NodeCountInliningCutoff
718 assert(slow_jvms != NULL, "must be");
719 kit.add_exception_states_from(slow_jvms);
720 kit.set_map(slow_jvms->map());
721 if (!kit.stopped())
722 slow_map = kit.stop();
723 }
724 }
725
726 if (kit.stopped()) {
727 // Instance exactly does not matches the desired type.
728 kit.set_jvms(slow_jvms);
729 return kit.transfer_exceptions_into_jvms();
730 }
731
732 // fall through if the instance exactly matches the desired type
733 kit.replace_in_map(receiver, casted_receiver);
734
735 // Make the hot call:
736 JVMState* new_jvms = _if_hit->generate(kit.sync_jvms());
737 if (new_jvms == NULL) {
738 // Inline failed, so make a direct call.
739 assert(_if_hit->is_inline(), "must have been a failed inline");
740 CallGenerator* cg = CallGenerator::for_direct_call(_if_hit->method());
741 new_jvms = cg->generate(kit.sync_jvms());
742 }
743 kit.add_exception_states_from(new_jvms);
744 kit.set_jvms(new_jvms);
745
746 // Need to merge slow and fast?
747 if (slow_map == NULL) {
748 // The fast path is the only path remaining.
749 return kit.transfer_exceptions_into_jvms();
750 }
751
752 if (kit.stopped()) {
753 // Inlined method threw an exception, so it's just the slow path after all.
754 kit.set_jvms(slow_jvms);
755 return kit.transfer_exceptions_into_jvms();
756 }
757
758 // There are 2 branches and the replaced nodes are only valid on
759 // one: restore the replaced nodes to what they were before the
760 // branch.
761 kit.map()->set_replaced_nodes(replaced_nodes);
762
763 // Finish the diamond.
764 kit.C->set_has_split_ifs(true); // Has chance for split-if optimization
765 RegionNode* region = new RegionNode(3);
766 region->init_req(1, kit.control());
767 region->init_req(2, slow_map->control());
768 kit.set_control(gvn.transform(region));
769 Node* iophi = PhiNode::make(region, kit.i_o(), Type::ABIO);
770 iophi->set_req(2, slow_map->i_o());
771 kit.set_i_o(gvn.transform(iophi));
772 // Merge memory
773 kit.merge_memory(slow_map->merged_memory(), region, 2);
774 // Transform new memory Phis.
775 for (MergeMemStream mms(kit.merged_memory()); mms.next_non_empty();) {
776 Node* phi = mms.memory();
777 if (phi->is_Phi() && phi->in(0) == region) {
778 mms.set_memory(gvn.transform(phi));
779 }
780 }
781 uint tos = kit.jvms()->stkoff() + kit.sp();
782 uint limit = slow_map->req();
783 for (uint i = TypeFunc::Parms; i < limit; i++) {
784 // Skip unused stack slots; fast forward to monoff();
785 if (i == tos) {
786 i = kit.jvms()->monoff();
787 if( i >= limit ) break;
788 }
789 Node* m = kit.map()->in(i);
790 Node* n = slow_map->in(i);
791 if (m != n) {
792 const Type* t = gvn.type(m)->meet_speculative(gvn.type(n));
793 Node* phi = PhiNode::make(region, m, t);
794 phi->set_req(2, n);
795 kit.map()->set_req(i, gvn.transform(phi));
796 }
797 }
798 return kit.transfer_exceptions_into_jvms();
799 }
800
801
802 CallGenerator* CallGenerator::for_method_handle_call(JVMState* jvms, ciMethod* caller, ciMethod* callee, bool delayed_forbidden) {
803 assert(callee->is_method_handle_intrinsic(), "for_method_handle_call mismatch");
804 bool input_not_const;
805 CallGenerator* cg = CallGenerator::for_method_handle_inline(jvms, caller, callee, input_not_const);
806 Compile* C = Compile::current();
807 if (cg != NULL) {
808 if (!delayed_forbidden && AlwaysIncrementalInline) {
809 return CallGenerator::for_late_inline(callee, cg);
810 } else {
811 return cg;
812 }
813 }
814 int bci = jvms->bci();
815 ciCallProfile profile = caller->call_profile_at_bci(bci);
816 int call_site_count = caller->scale_count(profile.count());
817
818 if (IncrementalInline && call_site_count > 0 &&
819 (input_not_const || !C->inlining_incrementally() || C->over_inlining_cutoff())) {
820 return CallGenerator::for_mh_late_inline(caller, callee, input_not_const);
821 } else {
822 // Out-of-line call.
823 return CallGenerator::for_direct_call(callee);
824 }
825 }
826
827 CallGenerator* CallGenerator::for_method_handle_inline(JVMState* jvms, ciMethod* caller, ciMethod* callee, bool& input_not_const) {
828 GraphKit kit(jvms);
829 PhaseGVN& gvn = kit.gvn();
830 Compile* C = kit.C;
831 vmIntrinsics::ID iid = callee->intrinsic_id();
832 input_not_const = true;
833 switch (iid) {
834 case vmIntrinsics::_invokeBasic:
835 {
836 // Get MethodHandle receiver:
837 Node* receiver = kit.argument(0);
838 if (receiver->Opcode() == Op_ConP) {
839 input_not_const = false;
840 const TypeOopPtr* oop_ptr = receiver->bottom_type()->is_oopptr();
841 ciMethod* target = oop_ptr->const_oop()->as_method_handle()->get_vmtarget();
842 const int vtable_index = Method::invalid_vtable_index;
843
844 if (!ciMethod::is_consistent_info(callee, target)) {
845 print_inlining_failure(C, callee, jvms->depth() - 1, jvms->bci(),
846 "signatures mismatch");
847 return NULL;
848 }
849
850 CallGenerator* cg = C->call_generator(target, vtable_index,
851 false /* call_does_dispatch */,
852 jvms,
853 true /* allow_inline */,
854 PROB_ALWAYS);
855 return cg;
856 } else {
857 print_inlining_failure(C, callee, jvms->depth() - 1, jvms->bci(),
858 "receiver not constant");
859 }
860 }
861 break;
862
863 case vmIntrinsics::_linkToVirtual:
864 case vmIntrinsics::_linkToStatic:
865 case vmIntrinsics::_linkToSpecial:
866 case vmIntrinsics::_linkToInterface:
867 {
868 // Get MemberName argument:
869 Node* member_name = kit.argument(callee->arg_size() - 1);
870 if (member_name->Opcode() == Op_ConP) {
871 input_not_const = false;
872 const TypeOopPtr* oop_ptr = member_name->bottom_type()->is_oopptr();
873 ciMethod* target = oop_ptr->const_oop()->as_member_name()->get_vmtarget();
874
875 if (!ciMethod::is_consistent_info(callee, target)) {
876 print_inlining_failure(C, callee, jvms->depth() - 1, jvms->bci(),
877 "signatures mismatch");
878 return NULL;
879 }
880
881 // In lambda forms we erase signature types to avoid resolving issues
882 // involving class loaders. When we optimize a method handle invoke
883 // to a direct call we must cast the receiver and arguments to its
884 // actual types.
885 ciSignature* signature = target->signature();
886 const int receiver_skip = target->is_static() ? 0 : 1;
887 // Cast receiver to its type.
888 if (!target->is_static()) {
889 Node* arg = kit.argument(0);
890 const TypeOopPtr* arg_type = arg->bottom_type()->isa_oopptr();
891 const Type* sig_type = TypeOopPtr::make_from_klass(signature->accessing_klass());
892 if (arg_type != NULL && !arg_type->higher_equal(sig_type)) {
893 Node* cast_obj = gvn.transform(new CheckCastPPNode(kit.control(), arg, sig_type));
894 kit.set_argument(0, cast_obj);
895 }
896 }
897 // Cast reference arguments to its type.
898 for (int i = 0, j = 0; i < signature->count(); i++) {
899 ciType* t = signature->type_at(i);
900 if (t->is_klass()) {
901 Node* arg = kit.argument(receiver_skip + j);
902 const TypeOopPtr* arg_type = arg->bottom_type()->isa_oopptr();
903 const Type* sig_type = TypeOopPtr::make_from_klass(t->as_klass());
904 if (arg_type != NULL && !arg_type->higher_equal(sig_type)) {
905 Node* cast_obj = gvn.transform(new CheckCastPPNode(kit.control(), arg, sig_type));
906 kit.set_argument(receiver_skip + j, cast_obj);
907 }
908 }
909 j += t->size(); // long and double take two slots
910 }
911
912 // Try to get the most accurate receiver type
913 const bool is_virtual = (iid == vmIntrinsics::_linkToVirtual);
914 const bool is_virtual_or_interface = (is_virtual || iid == vmIntrinsics::_linkToInterface);
915 int vtable_index = Method::invalid_vtable_index;
916 bool call_does_dispatch = false;
917
918 ciKlass* speculative_receiver_type = NULL;
919 if (is_virtual_or_interface) {
920 ciInstanceKlass* klass = target->holder();
921 Node* receiver_node = kit.argument(0);
922 const TypeOopPtr* receiver_type = gvn.type(receiver_node)->isa_oopptr();
923 // call_does_dispatch and vtable_index are out-parameters. They might be changed.
924 // optimize_virtual_call() takes 2 different holder
925 // arguments for a corner case that doesn't apply here (see
926 // Parse::do_call())
927 target = C->optimize_virtual_call(caller, jvms->bci(), klass, klass,
928 target, receiver_type, is_virtual,
929 call_does_dispatch, vtable_index, // out-parameters
930 false /* check_access */);
931 // We lack profiling at this call but type speculation may
932 // provide us with a type
933 speculative_receiver_type = (receiver_type != NULL) ? receiver_type->speculative_type() : NULL;
934 }
935 CallGenerator* cg = C->call_generator(target, vtable_index, call_does_dispatch, jvms,
936 true /* allow_inline */,
937 PROB_ALWAYS,
938 speculative_receiver_type);
939 return cg;
940 } else {
941 print_inlining_failure(C, callee, jvms->depth() - 1, jvms->bci(),
942 "member_name not constant");
943 }
944 }
945 break;
946
947 default:
948 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
949 break;
950 }
951 return NULL;
952 }
953
954
955 //------------------------PredicatedIntrinsicGenerator------------------------------
956 // Internal class which handles all predicated Intrinsic calls.
957 class PredicatedIntrinsicGenerator : public CallGenerator {
958 CallGenerator* _intrinsic;
959 CallGenerator* _cg;
960
961 public:
962 PredicatedIntrinsicGenerator(CallGenerator* intrinsic,
963 CallGenerator* cg)
964 : CallGenerator(cg->method())
965 {
966 _intrinsic = intrinsic;
967 _cg = cg;
968 }
969
970 virtual bool is_virtual() const { return true; }
971 virtual bool is_inlined() const { return true; }
972 virtual bool is_intrinsic() const { return true; }
973
974 virtual JVMState* generate(JVMState* jvms);
975 };
976
977
978 CallGenerator* CallGenerator::for_predicated_intrinsic(CallGenerator* intrinsic,
979 CallGenerator* cg) {
980 return new PredicatedIntrinsicGenerator(intrinsic, cg);
981 }
982
983
984 JVMState* PredicatedIntrinsicGenerator::generate(JVMState* jvms) {
985 // The code we want to generate here is:
986 // if (receiver == NULL)
987 // uncommon_Trap
988 // if (predicate(0))
989 // do_intrinsic(0)
990 // else
991 // if (predicate(1))
992 // do_intrinsic(1)
993 // ...
994 // else
995 // do_java_comp
996
997 GraphKit kit(jvms);
998 PhaseGVN& gvn = kit.gvn();
999
1000 CompileLog* log = kit.C->log();
1001 if (log != NULL) {
1002 log->elem("predicated_intrinsic bci='%d' method='%d'",
1003 jvms->bci(), log->identify(method()));
1004 }
1005
1006 if (!method()->is_static()) {
1007 // We need an explicit receiver null_check before checking its type in predicate.
1008 // We share a map with the caller, so his JVMS gets adjusted.
1009 Node* receiver = kit.null_check_receiver_before_call(method());
1010 if (kit.stopped()) {
1011 return kit.transfer_exceptions_into_jvms();
1012 }
1013 }
1014
1015 int n_predicates = _intrinsic->predicates_count();
1016 assert(n_predicates > 0, "sanity");
1017
1018 JVMState** result_jvms = NEW_RESOURCE_ARRAY(JVMState*, (n_predicates+1));
1019
1020 // Region for normal compilation code if intrinsic failed.
1021 Node* slow_region = new RegionNode(1);
1022
1023 int results = 0;
1024 for (int predicate = 0; (predicate < n_predicates) && !kit.stopped(); predicate++) {
1025 #ifdef ASSERT
1026 JVMState* old_jvms = kit.jvms();
1027 SafePointNode* old_map = kit.map();
1028 Node* old_io = old_map->i_o();
1029 Node* old_mem = old_map->memory();
1030 Node* old_exc = old_map->next_exception();
1031 #endif
1032 Node* else_ctrl = _intrinsic->generate_predicate(kit.sync_jvms(), predicate);
1033 #ifdef ASSERT
1034 // Assert(no_new_memory && no_new_io && no_new_exceptions) after generate_predicate.
1035 assert(old_jvms == kit.jvms(), "generate_predicate should not change jvm state");
1036 SafePointNode* new_map = kit.map();
1037 assert(old_io == new_map->i_o(), "generate_predicate should not change i_o");
1038 assert(old_mem == new_map->memory(), "generate_predicate should not change memory");
1039 assert(old_exc == new_map->next_exception(), "generate_predicate should not add exceptions");
1040 #endif
1041 if (!kit.stopped()) {
1042 PreserveJVMState pjvms(&kit);
1043 // Generate intrinsic code:
1044 JVMState* new_jvms = _intrinsic->generate(kit.sync_jvms());
1045 if (new_jvms == NULL) {
1046 // Intrinsic failed, use normal compilation path for this predicate.
1047 slow_region->add_req(kit.control());
1048 } else {
1049 kit.add_exception_states_from(new_jvms);
1050 kit.set_jvms(new_jvms);
1051 if (!kit.stopped()) {
1052 result_jvms[results++] = kit.jvms();
1053 }
1054 }
1055 }
1056 if (else_ctrl == NULL) {
1057 else_ctrl = kit.C->top();
1058 }
1059 kit.set_control(else_ctrl);
1060 }
1061 if (!kit.stopped()) {
1062 // Final 'else' after predicates.
1063 slow_region->add_req(kit.control());
1064 }
1065 if (slow_region->req() > 1) {
1066 PreserveJVMState pjvms(&kit);
1067 // Generate normal compilation code:
1068 kit.set_control(gvn.transform(slow_region));
1069 JVMState* new_jvms = _cg->generate(kit.sync_jvms());
1070 if (kit.failing())
1071 return NULL; // might happen because of NodeCountInliningCutoff
1072 assert(new_jvms != NULL, "must be");
1073 kit.add_exception_states_from(new_jvms);
1074 kit.set_jvms(new_jvms);
1075 if (!kit.stopped()) {
1076 result_jvms[results++] = kit.jvms();
1077 }
1078 }
1079
1080 if (results == 0) {
1081 // All paths ended in uncommon traps.
1082 (void) kit.stop();
1083 return kit.transfer_exceptions_into_jvms();
1084 }
1085
1086 if (results == 1) { // Only one path
1087 kit.set_jvms(result_jvms[0]);
1088 return kit.transfer_exceptions_into_jvms();
1089 }
1090
1091 // Merge all paths.
1092 kit.C->set_has_split_ifs(true); // Has chance for split-if optimization
1093 RegionNode* region = new RegionNode(results + 1);
1094 Node* iophi = PhiNode::make(region, kit.i_o(), Type::ABIO);
1095 for (int i = 0; i < results; i++) {
1096 JVMState* jvms = result_jvms[i];
1097 int path = i + 1;
1098 SafePointNode* map = jvms->map();
1099 region->init_req(path, map->control());
1100 iophi->set_req(path, map->i_o());
1101 if (i == 0) {
1102 kit.set_jvms(jvms);
1103 } else {
1104 kit.merge_memory(map->merged_memory(), region, path);
1105 }
1106 }
1107 kit.set_control(gvn.transform(region));
1108 kit.set_i_o(gvn.transform(iophi));
1109 // Transform new memory Phis.
1110 for (MergeMemStream mms(kit.merged_memory()); mms.next_non_empty();) {
1111 Node* phi = mms.memory();
1112 if (phi->is_Phi() && phi->in(0) == region) {
1113 mms.set_memory(gvn.transform(phi));
1114 }
1115 }
1116
1117 // Merge debug info.
1118 Node** ins = NEW_RESOURCE_ARRAY(Node*, results);
1119 uint tos = kit.jvms()->stkoff() + kit.sp();
1120 Node* map = kit.map();
1121 uint limit = map->req();
1122 for (uint i = TypeFunc::Parms; i < limit; i++) {
1123 // Skip unused stack slots; fast forward to monoff();
1124 if (i == tos) {
1125 i = kit.jvms()->monoff();
1126 if( i >= limit ) break;
1127 }
1128 Node* n = map->in(i);
1129 ins[0] = n;
1130 const Type* t = gvn.type(n);
1131 bool needs_phi = false;
1132 for (int j = 1; j < results; j++) {
1133 JVMState* jvms = result_jvms[j];
1134 Node* jmap = jvms->map();
1135 Node* m = NULL;
1136 if (jmap->req() > i) {
1137 m = jmap->in(i);
1138 if (m != n) {
1139 needs_phi = true;
1140 t = t->meet_speculative(gvn.type(m));
1141 }
1142 }
1143 ins[j] = m;
1144 }
1145 if (needs_phi) {
1146 Node* phi = PhiNode::make(region, n, t);
1147 for (int j = 1; j < results; j++) {
1148 phi->set_req(j + 1, ins[j]);
1149 }
1150 map->set_req(i, gvn.transform(phi));
1151 }
1152 }
1153
1154 return kit.transfer_exceptions_into_jvms();
1155 }
1156
1157 //-------------------------UncommonTrapCallGenerator-----------------------------
1158 // Internal class which handles all out-of-line calls checking receiver type.
1159 class UncommonTrapCallGenerator : public CallGenerator {
1160 Deoptimization::DeoptReason _reason;
1161 Deoptimization::DeoptAction _action;
1162
1163 public:
1164 UncommonTrapCallGenerator(ciMethod* m,
1165 Deoptimization::DeoptReason reason,
1166 Deoptimization::DeoptAction action)
1167 : CallGenerator(m)
1168 {
1169 _reason = reason;
1170 _action = action;
1171 }
1172
1173 virtual bool is_virtual() const { ShouldNotReachHere(); return false; }
1174 virtual bool is_trap() const { return true; }
1175
1176 virtual JVMState* generate(JVMState* jvms);
1177 };
1178
1179
1180 CallGenerator*
1181 CallGenerator::for_uncommon_trap(ciMethod* m,
1182 Deoptimization::DeoptReason reason,
1183 Deoptimization::DeoptAction action) {
1184 return new UncommonTrapCallGenerator(m, reason, action);
1185 }
1186
1187
1188 JVMState* UncommonTrapCallGenerator::generate(JVMState* jvms) {
1189 GraphKit kit(jvms);
1190 kit.C->print_inlining_update(this);
1191 // Take the trap with arguments pushed on the stack. (Cf. null_check_receiver).
1192 // Callsite signature can be different from actual method being called (i.e _linkTo* sites).
1193 // Use callsite signature always.
1194 ciMethod* declared_method = kit.method()->get_method_at_bci(kit.bci());
1195 int nargs = declared_method->arg_size();
1196 kit.inc_sp(nargs);
1197 assert(nargs <= kit.sp() && kit.sp() <= jvms->stk_size(), "sane sp w/ args pushed");
1198 if (_reason == Deoptimization::Reason_class_check &&
1199 _action == Deoptimization::Action_maybe_recompile) {
1200 // Temp fix for 6529811
1201 // Don't allow uncommon_trap to override our decision to recompile in the event
1202 // of a class cast failure for a monomorphic call as it will never let us convert
1203 // the call to either bi-morphic or megamorphic and can lead to unc-trap loops
1204 bool keep_exact_action = true;
1205 kit.uncommon_trap(_reason, _action, NULL, "monomorphic vcall checkcast", false, keep_exact_action);
1206 } else {
1207 kit.uncommon_trap(_reason, _action);
1208 }
1209 return kit.transfer_exceptions_into_jvms();
1210 }
1211
1212 // (Note: Moved hook_up_call to GraphKit::set_edges_for_java_call.)
1213
1214 // (Node: Merged hook_up_exits into ParseGenerator::generate.)
1215
1216 #define NODES_OVERHEAD_PER_METHOD (30.0)
1217 #define NODES_PER_BYTECODE (9.5)
1218
1219 void WarmCallInfo::init(JVMState* call_site, ciMethod* call_method, ciCallProfile& profile, float prof_factor) {
1220 int call_count = profile.count();
1221 int code_size = call_method->code_size();
1222
1223 // Expected execution count is based on the historical count:
1224 _count = call_count < 0 ? 1 : call_site->method()->scale_count(call_count, prof_factor);
1225
1226 // Expected profit from inlining, in units of simple call-overheads.
1227 _profit = 1.0;
1228
1229 // Expected work performed by the call in units of call-overheads.
1230 // %%% need an empirical curve fit for "work" (time in call)
1231 float bytecodes_per_call = 3;
1232 _work = 1.0 + code_size / bytecodes_per_call;
1233
1234 // Expected size of compilation graph:
1235 // -XX:+PrintParseStatistics once reported:
1236 // Methods seen: 9184 Methods parsed: 9184 Nodes created: 1582391
1237 // Histogram of 144298 parsed bytecodes:
1238 // %%% Need an better predictor for graph size.
1239 _size = NODES_OVERHEAD_PER_METHOD + (NODES_PER_BYTECODE * code_size);
1240 }
1241
1242 // is_cold: Return true if the node should never be inlined.
1243 // This is true if any of the key metrics are extreme.
1244 bool WarmCallInfo::is_cold() const {
1245 if (count() < WarmCallMinCount) return true;
1246 if (profit() < WarmCallMinProfit) return true;
1247 if (work() > WarmCallMaxWork) return true;
1248 if (size() > WarmCallMaxSize) return true;
1249 return false;
1250 }
1251
1252 // is_hot: Return true if the node should be inlined immediately.
1253 // This is true if any of the key metrics are extreme.
1254 bool WarmCallInfo::is_hot() const {
1255 assert(!is_cold(), "eliminate is_cold cases before testing is_hot");
1256 if (count() >= HotCallCountThreshold) return true;
1257 if (profit() >= HotCallProfitThreshold) return true;
1258 if (work() <= HotCallTrivialWork) return true;
1259 if (size() <= HotCallTrivialSize) return true;
1260 return false;
1261 }
1262
1263 // compute_heat:
1264 float WarmCallInfo::compute_heat() const {
1265 assert(!is_cold(), "compute heat only on warm nodes");
1266 assert(!is_hot(), "compute heat only on warm nodes");
1267 int min_size = MAX2(0, (int)HotCallTrivialSize);
1268 int max_size = MIN2(500, (int)WarmCallMaxSize);
1269 float method_size = (size() - min_size) / MAX2(1, max_size - min_size);
1270 float size_factor;
1271 if (method_size < 0.05) size_factor = 4; // 2 sigmas better than avg.
1272 else if (method_size < 0.15) size_factor = 2; // 1 sigma better than avg.
1273 else if (method_size < 0.5) size_factor = 1; // better than avg.
1274 else size_factor = 0.5; // worse than avg.
1275 return (count() * profit() * size_factor);
1276 }
1277
1278 bool WarmCallInfo::warmer_than(WarmCallInfo* that) {
1279 assert(this != that, "compare only different WCIs");
1280 assert(this->heat() != 0 && that->heat() != 0, "call compute_heat 1st");
1281 if (this->heat() > that->heat()) return true;
1282 if (this->heat() < that->heat()) return false;
1283 assert(this->heat() == that->heat(), "no NaN heat allowed");
1284 // Equal heat. Break the tie some other way.
1285 if (!this->call() || !that->call()) return (address)this > (address)that;
1286 return this->call()->_idx > that->call()->_idx;
1287 }
1288
1289 //#define UNINIT_NEXT ((WarmCallInfo*)badAddress)
1290 #define UNINIT_NEXT ((WarmCallInfo*)NULL)
1291
1292 WarmCallInfo* WarmCallInfo::insert_into(WarmCallInfo* head) {
1293 assert(next() == UNINIT_NEXT, "not yet on any list");
1294 WarmCallInfo* prev_p = NULL;
1295 WarmCallInfo* next_p = head;
1296 while (next_p != NULL && next_p->warmer_than(this)) {
1297 prev_p = next_p;
1298 next_p = prev_p->next();
1299 }
1300 // Install this between prev_p and next_p.
1301 this->set_next(next_p);
1302 if (prev_p == NULL)
1303 head = this;
1304 else
1305 prev_p->set_next(this);
1306 return head;
1307 }
1308
1309 WarmCallInfo* WarmCallInfo::remove_from(WarmCallInfo* head) {
1310 WarmCallInfo* prev_p = NULL;
1311 WarmCallInfo* next_p = head;
1312 while (next_p != this) {
1313 assert(next_p != NULL, "this must be in the list somewhere");
1314 prev_p = next_p;
1315 next_p = prev_p->next();
1316 }
1317 next_p = this->next();
1318 debug_only(this->set_next(UNINIT_NEXT));
1319 // Remove this from between prev_p and next_p.
1320 if (prev_p == NULL)
1321 head = next_p;
1322 else
1323 prev_p->set_next(next_p);
1324 return head;
1325 }
1326
1327 WarmCallInfo WarmCallInfo::_always_hot(WarmCallInfo::MAX_VALUE(), WarmCallInfo::MAX_VALUE(),
1328 WarmCallInfo::MIN_VALUE(), WarmCallInfo::MIN_VALUE());
1329 WarmCallInfo WarmCallInfo::_always_cold(WarmCallInfo::MIN_VALUE(), WarmCallInfo::MIN_VALUE(),
1330 WarmCallInfo::MAX_VALUE(), WarmCallInfo::MAX_VALUE());
1331
1332 WarmCallInfo* WarmCallInfo::always_hot() {
1333 assert(_always_hot.is_hot(), "must always be hot");
1334 return &_always_hot;
1335 }
1336
1337 WarmCallInfo* WarmCallInfo::always_cold() {
1338 assert(_always_cold.is_cold(), "must always be cold");
1339 return &_always_cold;
1340 }
1341
1342
1343 #ifndef PRODUCT
1344
1345 void WarmCallInfo::print() const {
1346 tty->print("%s : C=%6.1f P=%6.1f W=%6.1f S=%6.1f H=%6.1f -> %p",
1347 is_cold() ? "cold" : is_hot() ? "hot " : "warm",
1348 count(), profit(), work(), size(), compute_heat(), next());
1349 tty->cr();
1350 if (call() != NULL) call()->dump();
1351 }
1352
1353 void print_wci(WarmCallInfo* ci) {
1354 ci->print();
1355 }
1356
1357 void WarmCallInfo::print_all() const {
1358 for (const WarmCallInfo* p = this; p != NULL; p = p->next())
1359 p->print();
1360 }
1361
1362 int WarmCallInfo::count_all() const {
1363 int cnt = 0;
1364 for (const WarmCallInfo* p = this; p != NULL; p = p->next())
1365 cnt++;
1366 return cnt;
1367 }
1368
1369 #endif //PRODUCT