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 "opto/valuetypenode.hpp"
43 #include "runtime/sharedRuntime.hpp"
44
45 // Utility function.
46 const TypeFunc* CallGenerator::tf() const {
47 return TypeFunc::make(method());
48 }
49
50 bool CallGenerator::is_inlined_method_handle_intrinsic(JVMState* jvms, ciMethod* callee) {
51 ciMethod* symbolic_info = jvms->method()->get_method_at_bci(jvms->bci());
52 return symbolic_info->is_method_handle_intrinsic() && !callee->is_method_handle_intrinsic();
53 }
54
55 //-----------------------------ParseGenerator---------------------------------
56 // Internal class which handles all direct bytecode traversal.
57 class ParseGenerator : public InlineCallGenerator {
58 private:
59 bool _is_osr;
60 float _expected_uses;
61
62 public:
63 ParseGenerator(ciMethod* method, float expected_uses, bool is_osr = false)
64 : InlineCallGenerator(method)
65 {
66 _is_osr = is_osr;
67 _expected_uses = expected_uses;
68 assert(InlineTree::check_can_parse(method) == NULL, "parse must be possible");
69 }
70
71 virtual bool is_parse() const { return true; }
72 virtual JVMState* generate(JVMState* jvms);
73 int is_osr() { return _is_osr; }
74
75 };
76
77 JVMState* ParseGenerator::generate(JVMState* jvms) {
78 Compile* C = Compile::current();
79 C->print_inlining_update(this);
80
81 if (is_osr()) {
82 // The JVMS for a OSR has a single argument (see its TypeFunc).
83 assert(jvms->depth() == 1, "no inline OSR");
84 }
85
86 if (C->failing()) {
87 return NULL; // bailing out of the compile; do not try to parse
88 }
89
90 Parse parser(jvms, method(), _expected_uses);
91 // Grab signature for matching/allocation
92 #ifdef ASSERT
93 if (parser.tf() != (parser.depth() == 1 ? C->tf() : tf())) {
94 MutexLockerEx ml(Compile_lock, Mutex::_no_safepoint_check_flag);
95 assert(C->env()->system_dictionary_modification_counter_changed(),
96 "Must invalidate if TypeFuncs differ");
97 }
98 #endif
99
100 GraphKit& exits = parser.exits();
101
102 if (C->failing()) {
103 while (exits.pop_exception_state() != NULL) ;
104 return NULL;
105 }
106
107 assert(exits.jvms()->same_calls_as(jvms), "sanity");
108
109 // Simply return the exit state of the parser,
110 // augmented by any exceptional states.
111 return exits.transfer_exceptions_into_jvms();
112 }
113
114 //---------------------------DirectCallGenerator------------------------------
115 // Internal class which handles all out-of-line calls w/o receiver type checks.
116 class DirectCallGenerator : public CallGenerator {
117 private:
118 CallStaticJavaNode* _call_node;
119 // Force separate memory and I/O projections for the exceptional
120 // paths to facilitate late inlining.
121 bool _separate_io_proj;
122
123 public:
124 DirectCallGenerator(ciMethod* method, bool separate_io_proj)
125 : CallGenerator(method),
126 _separate_io_proj(separate_io_proj)
127 {
128 if (method->is_method_handle_intrinsic() &&
129 method->signature()->return_type()->is__Value()) {
130 // If that call has not been optimized by the time optimizations
131 // are over, we'll need to add a call to create a value type
132 // instance from the klass returned by the call. Separating
133 // memory and I/O projections for exceptions is required to
134 // perform that graph transformation.
135 _separate_io_proj = true;
136 }
137 }
138 virtual JVMState* generate(JVMState* jvms);
139
140 CallStaticJavaNode* call_node() const { return _call_node; }
141 };
142
143 JVMState* DirectCallGenerator::generate(JVMState* jvms) {
144 GraphKit kit(jvms);
145 kit.C->print_inlining_update(this);
146 PhaseGVN& gvn = kit.gvn();
147 bool is_static = method()->is_static();
148 address target = is_static ? SharedRuntime::get_resolve_static_call_stub()
149 : SharedRuntime::get_resolve_opt_virtual_call_stub();
150
151 if (kit.C->log() != NULL) {
152 kit.C->log()->elem("direct_call bci='%d'", jvms->bci());
153 }
154
155 CallStaticJavaNode *call = new CallStaticJavaNode(kit.C, tf(), target, method(), kit.bci());
156 if (is_inlined_method_handle_intrinsic(jvms, method())) {
157 // To be able to issue a direct call and skip a call to MH.linkTo*/invokeBasic adapter,
158 // additional information about the method being invoked should be attached
159 // to the call site to make resolution logic work
160 // (see SharedRuntime::resolve_static_call_C).
161 call->set_override_symbolic_info(true);
162 }
163 _call_node = call; // Save the call node in case we need it later
164 if (!is_static) {
165 if (!kit.argument(0)->is_ValueType()) {
166 // Make an explicit receiver null_check as part of this call.
167 // Since we share a map with the caller, his JVMS gets adjusted.
168 kit.null_check_receiver_before_call(method());
169 }
170 if (kit.stopped()) {
171 // And dump it back to the caller, decorated with any exceptions:
172 return kit.transfer_exceptions_into_jvms();
173 }
174 // Mark the call node as virtual, sort of:
175 call->set_optimized_virtual(true);
176 if (method()->is_method_handle_intrinsic() ||
177 method()->is_compiled_lambda_form()) {
178 call->set_method_handle_invoke(true);
179 }
180 }
181 kit.set_arguments_for_java_call(call);
182 kit.set_edges_for_java_call(call, false, _separate_io_proj);
183 Node* ret = kit.set_results_for_java_call(call, _separate_io_proj);
184 // Check if return value is a value type pointer
185 const TypeValueTypePtr* vtptr = gvn.type(ret)->isa_valuetypeptr();
186 if (vtptr != NULL) {
187 if (!vtptr->is__Value()) {
188 // Create ValueTypeNode from the oop and replace the return value
189 Node* vt = ValueTypeNode::make(&kit, ret);
190 kit.push_node(T_VALUETYPE, vt);
191 } else {
192 kit.push_node(T_VALUETYPE, ret);
193 }
194 } else {
195 kit.push_node(method()->return_type()->basic_type(), ret);
196 }
197 return kit.transfer_exceptions_into_jvms();
198 }
199
200 //--------------------------VirtualCallGenerator------------------------------
201 // Internal class which handles all out-of-line calls checking receiver type.
202 class VirtualCallGenerator : public CallGenerator {
203 private:
204 int _vtable_index;
205 public:
206 VirtualCallGenerator(ciMethod* method, int vtable_index)
207 : CallGenerator(method), _vtable_index(vtable_index)
208 {
209 assert(vtable_index == Method::invalid_vtable_index ||
210 vtable_index >= 0, "either invalid or usable");
211 }
212 virtual bool is_virtual() const { return true; }
213 virtual JVMState* generate(JVMState* jvms);
214 };
215
216 JVMState* VirtualCallGenerator::generate(JVMState* jvms) {
217 GraphKit kit(jvms);
218 Node* receiver = kit.argument(0);
219 PhaseGVN& gvn = kit.gvn();
220 kit.C->print_inlining_update(this);
221
222 if (kit.C->log() != NULL) {
223 kit.C->log()->elem("virtual_call bci='%d'", jvms->bci());
224 }
225
226 // If the receiver is a constant null, do not torture the system
227 // by attempting to call through it. The compile will proceed
228 // correctly, but may bail out in final_graph_reshaping, because
229 // the call instruction will have a seemingly deficient out-count.
230 // (The bailout says something misleading about an "infinite loop".)
231 if (kit.gvn().type(receiver)->higher_equal(TypePtr::NULL_PTR)) {
232 assert(Bytecodes::is_invoke(kit.java_bc()), "%d: %s", kit.java_bc(), Bytecodes::name(kit.java_bc()));
233 ciMethod* declared_method = kit.method()->get_method_at_bci(kit.bci());
234 int arg_size = declared_method->signature()->arg_size_for_bc(kit.java_bc());
235 kit.inc_sp(arg_size); // restore arguments
236 kit.uncommon_trap(Deoptimization::Reason_null_check,
237 Deoptimization::Action_none,
238 NULL, "null receiver");
239 return kit.transfer_exceptions_into_jvms();
240 }
241
242 // Ideally we would unconditionally do a null check here and let it
243 // be converted to an implicit check based on profile information.
244 // However currently the conversion to implicit null checks in
245 // Block::implicit_null_check() only looks for loads and stores, not calls.
246 ciMethod *caller = kit.method();
247 ciMethodData *caller_md = (caller == NULL) ? NULL : caller->method_data();
248 if (!UseInlineCaches || !ImplicitNullChecks || !os::zero_page_read_protected() ||
249 ((ImplicitNullCheckThreshold > 0) && caller_md &&
250 (caller_md->trap_count(Deoptimization::Reason_null_check)
251 >= (uint)ImplicitNullCheckThreshold))) {
252 // Make an explicit receiver null_check as part of this call.
253 // Since we share a map with the caller, his JVMS gets adjusted.
254 receiver = kit.null_check_receiver_before_call(method());
255 if (kit.stopped()) {
256 // And dump it back to the caller, decorated with any exceptions:
257 return kit.transfer_exceptions_into_jvms();
258 }
259 }
260
261 assert(!method()->is_static(), "virtual call must not be to static");
262 assert(!method()->is_final(), "virtual call should not be to final");
263 assert(!method()->is_private(), "virtual call should not be to private");
264 assert(_vtable_index == Method::invalid_vtable_index || !UseInlineCaches,
265 "no vtable calls if +UseInlineCaches ");
266 address target = SharedRuntime::get_resolve_virtual_call_stub();
267 // Normal inline cache used for call
268 CallDynamicJavaNode *call = new CallDynamicJavaNode(tf(), target, method(), _vtable_index, kit.bci());
269 if (is_inlined_method_handle_intrinsic(jvms, method())) {
270 // To be able to issue a direct call (optimized virtual or virtual)
271 // and skip a call to MH.linkTo*/invokeBasic adapter, additional information
272 // about the method being invoked should be attached to the call site to
273 // make resolution logic work (see SharedRuntime::resolve_{virtual,opt_virtual}_call_C).
274 call->set_override_symbolic_info(true);
275 }
276 kit.set_arguments_for_java_call(call);
277 kit.set_edges_for_java_call(call);
278 Node* ret = kit.set_results_for_java_call(call);
279 // Check if return value is a value type pointer
280 if (gvn.type(ret)->isa_valuetypeptr()) {
281 // Create ValueTypeNode from the oop and replace the return value
282 Node* ctl = kit.control();
283 Node* vt = ValueTypeNode::make(&kit, ret);
284 kit.set_control(ctl);
285 kit.push_node(T_VALUETYPE, vt);
286 } else {
287 kit.push_node(method()->return_type()->basic_type(), ret);
288 }
289
290 // Represent the effect of an implicit receiver null_check
291 // as part of this call. Since we share a map with the caller,
292 // his JVMS gets adjusted.
293 kit.cast_not_null(receiver);
294 return kit.transfer_exceptions_into_jvms();
295 }
296
297 CallGenerator* CallGenerator::for_inline(ciMethod* m, float expected_uses) {
298 if (InlineTree::check_can_parse(m) != NULL) return NULL;
299 return new ParseGenerator(m, expected_uses);
300 }
301
302 // As a special case, the JVMS passed to this CallGenerator is
303 // for the method execution already in progress, not just the JVMS
304 // of the caller. Thus, this CallGenerator cannot be mixed with others!
305 CallGenerator* CallGenerator::for_osr(ciMethod* m, int osr_bci) {
306 if (InlineTree::check_can_parse(m) != NULL) return NULL;
307 float past_uses = m->interpreter_invocation_count();
308 float expected_uses = past_uses;
309 return new ParseGenerator(m, expected_uses, true);
310 }
311
312 CallGenerator* CallGenerator::for_direct_call(ciMethod* m, bool separate_io_proj) {
313 assert(!m->is_abstract(), "for_direct_call mismatch");
314 return new DirectCallGenerator(m, separate_io_proj);
315 }
316
317 CallGenerator* CallGenerator::for_virtual_call(ciMethod* m, int vtable_index) {
318 assert(!m->is_static(), "for_virtual_call mismatch");
319 assert(!m->is_method_handle_intrinsic(), "should be a direct call");
320 return new VirtualCallGenerator(m, vtable_index);
321 }
322
323 // Allow inlining decisions to be delayed
324 class LateInlineCallGenerator : public DirectCallGenerator {
325 private:
326 // unique id for log compilation
327 jlong _unique_id;
328
329 protected:
330 CallGenerator* _inline_cg;
331 virtual bool do_late_inline_check(JVMState* jvms) { return true; }
332
333 public:
334 LateInlineCallGenerator(ciMethod* method, CallGenerator* inline_cg) :
335 DirectCallGenerator(method, true), _inline_cg(inline_cg), _unique_id(0) {}
336
337 virtual bool is_late_inline() const { return true; }
338
339 // Convert the CallStaticJava into an inline
340 virtual void do_late_inline();
341
342 virtual JVMState* generate(JVMState* jvms) {
343 Compile *C = Compile::current();
344
345 C->log_inline_id(this);
346
347 // Record that this call site should be revisited once the main
348 // parse is finished.
349 if (!is_mh_late_inline()) {
350 C->add_late_inline(this);
351 }
352
353 // Emit the CallStaticJava and request separate projections so
354 // that the late inlining logic can distinguish between fall
355 // through and exceptional uses of the memory and io projections
356 // as is done for allocations and macro expansion.
357 return DirectCallGenerator::generate(jvms);
358 }
359
360 virtual void print_inlining_late(const char* msg) {
361 CallNode* call = call_node();
362 Compile* C = Compile::current();
363 C->print_inlining_assert_ready();
364 C->print_inlining(method(), call->jvms()->depth()-1, call->jvms()->bci(), msg);
365 C->print_inlining_move_to(this);
366 C->print_inlining_update_delayed(this);
367 }
368
369 virtual void set_unique_id(jlong id) {
370 _unique_id = id;
371 }
372
373 virtual jlong unique_id() const {
374 return _unique_id;
375 }
376 };
377
378 void LateInlineCallGenerator::do_late_inline() {
379 // Can't inline it
380 CallStaticJavaNode* call = call_node();
381 if (call == NULL || call->outcnt() == 0 ||
382 call->in(0) == NULL || call->in(0)->is_top()) {
383 return;
384 }
385
386 const TypeTuple *r = call->tf()->domain_cc();
387 for (int i1 = 0; i1 < method()->arg_size(); i1++) {
388 if (call->in(TypeFunc::Parms + i1)->is_top() && r->field_at(TypeFunc::Parms + i1) != Type::HALF) {
389 assert(Compile::current()->inlining_incrementally(), "shouldn't happen during parsing");
390 return;
391 }
392 }
393
394 if (call->in(TypeFunc::Memory)->is_top()) {
395 assert(Compile::current()->inlining_incrementally(), "shouldn't happen during parsing");
396 return;
397 }
398
399 Compile* C = Compile::current();
400 // Remove inlined methods from Compiler's lists.
401 if (call->is_macro()) {
402 C->remove_macro_node(call);
403 }
404
405 // Make a clone of the JVMState that appropriate to use for driving a parse
406 JVMState* old_jvms = call->jvms();
407 JVMState* jvms = old_jvms->clone_shallow(C);
408 uint size = call->req();
409 SafePointNode* map = new SafePointNode(size, jvms);
410 for (uint i1 = 0; i1 < size; i1++) {
411 map->init_req(i1, call->in(i1));
412 }
413
414 PhaseGVN& gvn = *C->initial_gvn();
415 // Make sure the state is a MergeMem for parsing.
416 if (!map->in(TypeFunc::Memory)->is_MergeMem()) {
417 Node* mem = MergeMemNode::make(map->in(TypeFunc::Memory));
418 gvn.set_type_bottom(mem);
419 map->set_req(TypeFunc::Memory, mem);
420 }
421
422 // blow away old call arguments
423 Node* top = C->top();
424 for (uint i1 = TypeFunc::Parms; i1 < call->_tf->domain_cc()->cnt(); i1++) {
425 map->set_req(i1, top);
426 }
427 jvms->set_map(map);
428
429 // Make enough space in the expression stack to transfer
430 // the incoming arguments and return value.
431 map->ensure_stack(jvms, jvms->method()->max_stack());
432 const TypeTuple *domain_sig = call->_tf->domain_sig();
433 uint nargs = method()->arg_size();
434 assert(domain_sig->cnt() - TypeFunc::Parms == nargs, "inconsistent signature");
435
436 uint j = TypeFunc::Parms;
437 for (uint i1 = 0; i1 < nargs; i1++) {
438 const Type* t = domain_sig->field_at(TypeFunc::Parms + i1);
439 if (!ValueTypePassFieldsAsArgs) {
440 Node* arg = call->in(TypeFunc::Parms + i1);
441 if (t->isa_valuetypeptr()) {
442 Node* ctl = map->control();
443 arg = ValueTypeNode::make(gvn, ctl, map->memory(), arg);
444 map->set_control(ctl);
445 }
446 map->set_argument(jvms, i1, arg);
447 } else {
448 if (t->isa_valuetypeptr() && !t->is_valuetypeptr()->is__Value()) {
449 ciValueKlass* vk = t->is_valuetypeptr()->value_type()->value_klass();
450 Node* ctl = map->control();
451 Node* vt = ValueTypeNode::make(gvn, ctl, map->memory(), call, vk, j, true);
452 map->set_control(ctl);
453 map->set_argument(jvms, i1, gvn.transform(vt));
454 j += vk->value_arg_slots();
455 } else {
456 map->set_argument(jvms, i1, call->in(j));
457 j++;
458 }
459 }
460 }
461
462 C->print_inlining_assert_ready();
463
464 C->print_inlining_move_to(this);
465
466 C->log_late_inline(this);
467
468 // This check is done here because for_method_handle_inline() method
469 // needs jvms for inlined state.
470 if (!do_late_inline_check(jvms)) {
471 map->disconnect_inputs(NULL, C);
472 return;
473 }
474
475 // Setup default node notes to be picked up by the inlining
476 Node_Notes* old_nn = C->node_notes_at(call->_idx);
477 if (old_nn != NULL) {
478 Node_Notes* entry_nn = old_nn->clone(C);
479 entry_nn->set_jvms(jvms);
480 C->set_default_node_notes(entry_nn);
481 }
482
483 // Now perform the inlining using the synthesized JVMState
484 JVMState* new_jvms = _inline_cg->generate(jvms);
485 if (new_jvms == NULL) return; // no change
486 if (C->failing()) return;
487
488 // Capture any exceptional control flow
489 GraphKit kit(new_jvms);
490
491 // Find the result object
492 Node* result = C->top();
493 ciType* return_type = _inline_cg->method()->return_type();
494 int result_size = return_type->size();
495 if (result_size != 0 && !kit.stopped()) {
496 result = (result_size == 1) ? kit.pop() : kit.pop_pair();
497 }
498
499 C->set_has_loops(C->has_loops() || _inline_cg->method()->has_loops());
500 C->env()->notice_inlined_method(_inline_cg->method());
501 C->set_inlining_progress(true);
502
503 if (return_type->is_valuetype()) {
504 const Type* vt_t = call->_tf->range_sig()->field_at(TypeFunc::Parms);
505 bool returned_as_fields = call->tf()->returns_value_type_as_fields();
506 if (result->is_ValueType()) {
507 ValueTypeNode* vt = result->as_ValueType();
508 if (!returned_as_fields) {
509 result = vt->allocate(&kit)->get_oop();
510 result = gvn.transform(new ValueTypePtrNode(vt, result, C));
511 } else {
512 // Return of multiple values (the fields of a value type)
513 vt->replace_call_results(&kit, call, C);
514 if (gvn.type(vt->get_oop()) == TypePtr::NULL_PTR) {
515 result = vt->tagged_klass(gvn);
516 } else {
517 result = vt->get_oop();
518 }
519 }
520 } else if (gvn.type(result)->isa_valuetypeptr() && returned_as_fields) {
521 assert(!vt_t->is_valuetypeptr()->is__Value(), "__Value not supported");
522 Node* cast = new CheckCastPPNode(NULL, result, vt_t);
523 gvn.record_for_igvn(cast);
524 Node* ctl = kit.control();
525 ValueTypePtrNode* vtptr = ValueTypePtrNode::make(gvn, ctl, kit.merged_memory(), gvn.transform(cast));
526 kit.set_control(ctl);
527 vtptr->replace_call_results(&kit, call, C);
528 result = cast;
529 } else if (!return_type->is__Value()) {
530 assert(result->is_top(), "what else?");
531 for (DUIterator_Fast imax, i = call->fast_outs(imax); i < imax; i++) {
532 ProjNode *pn = call->fast_out(i)->as_Proj();
533 uint con = pn->_con;
534 if (con >= TypeFunc::Parms) {
535 gvn.hash_delete(pn);
536 pn->set_req(0, C->top());
537 --i; --imax;
538 }
539 }
540 }
541 }
542
543 kit.replace_call(call, result, true);
544 }
545
546
547 CallGenerator* CallGenerator::for_late_inline(ciMethod* method, CallGenerator* inline_cg) {
548 return new LateInlineCallGenerator(method, inline_cg);
549 }
550
551 class LateInlineMHCallGenerator : public LateInlineCallGenerator {
552 ciMethod* _caller;
553 int _attempt;
554 bool _input_not_const;
555
556 virtual bool do_late_inline_check(JVMState* jvms);
557 virtual bool already_attempted() const { return _attempt > 0; }
558
559 public:
560 LateInlineMHCallGenerator(ciMethod* caller, ciMethod* callee, bool input_not_const) :
561 LateInlineCallGenerator(callee, NULL), _caller(caller), _attempt(0), _input_not_const(input_not_const) {}
562
563 virtual bool is_mh_late_inline() const { return true; }
564
565 virtual JVMState* generate(JVMState* jvms) {
566 JVMState* new_jvms = LateInlineCallGenerator::generate(jvms);
567
568 Compile* C = Compile::current();
569 if (_input_not_const) {
570 // inlining won't be possible so no need to enqueue right now.
571 call_node()->set_generator(this);
572 } else {
573 C->add_late_inline(this);
574 }
575 return new_jvms;
576 }
577 };
578
579 bool LateInlineMHCallGenerator::do_late_inline_check(JVMState* jvms) {
580
581 CallGenerator* cg = for_method_handle_inline(jvms, _caller, method(), _input_not_const, AlwaysIncrementalInline);
582
583 Compile::current()->print_inlining_update_delayed(this);
584
585 if (!_input_not_const) {
586 _attempt++;
587 }
588
589 if (cg != NULL && (cg->is_inline() || cg->is_inlined_method_handle_intrinsic(jvms, cg->method()))) {
590 assert(!cg->is_late_inline(), "we're doing late inlining");
591 _inline_cg = cg;
592 Compile::current()->dec_number_of_mh_late_inlines();
593 return true;
594 }
595
596 call_node()->set_generator(this);
597 return false;
598 }
599
600 CallGenerator* CallGenerator::for_mh_late_inline(ciMethod* caller, ciMethod* callee, bool input_not_const) {
601 Compile::current()->inc_number_of_mh_late_inlines();
602 CallGenerator* cg = new LateInlineMHCallGenerator(caller, callee, input_not_const);
603 return cg;
604 }
605
606 class LateInlineStringCallGenerator : public LateInlineCallGenerator {
607
608 public:
609 LateInlineStringCallGenerator(ciMethod* method, CallGenerator* inline_cg) :
610 LateInlineCallGenerator(method, inline_cg) {}
611
612 virtual JVMState* generate(JVMState* jvms) {
613 Compile *C = Compile::current();
614
615 C->log_inline_id(this);
616
617 C->add_string_late_inline(this);
618
619 JVMState* new_jvms = DirectCallGenerator::generate(jvms);
620 return new_jvms;
621 }
622
623 virtual bool is_string_late_inline() const { return true; }
624 };
625
626 CallGenerator* CallGenerator::for_string_late_inline(ciMethod* method, CallGenerator* inline_cg) {
627 return new LateInlineStringCallGenerator(method, inline_cg);
628 }
629
630 class LateInlineBoxingCallGenerator : public LateInlineCallGenerator {
631
632 public:
633 LateInlineBoxingCallGenerator(ciMethod* method, CallGenerator* inline_cg) :
634 LateInlineCallGenerator(method, inline_cg) {}
635
636 virtual JVMState* generate(JVMState* jvms) {
637 Compile *C = Compile::current();
638
639 C->log_inline_id(this);
640
641 C->add_boxing_late_inline(this);
642
643 JVMState* new_jvms = DirectCallGenerator::generate(jvms);
644 return new_jvms;
645 }
646 };
647
648 CallGenerator* CallGenerator::for_boxing_late_inline(ciMethod* method, CallGenerator* inline_cg) {
649 return new LateInlineBoxingCallGenerator(method, inline_cg);
650 }
651
652 //---------------------------WarmCallGenerator--------------------------------
653 // Internal class which handles initial deferral of inlining decisions.
654 class WarmCallGenerator : public CallGenerator {
655 WarmCallInfo* _call_info;
656 CallGenerator* _if_cold;
657 CallGenerator* _if_hot;
658 bool _is_virtual; // caches virtuality of if_cold
659 bool _is_inline; // caches inline-ness of if_hot
660
661 public:
662 WarmCallGenerator(WarmCallInfo* ci,
663 CallGenerator* if_cold,
664 CallGenerator* if_hot)
665 : CallGenerator(if_cold->method())
666 {
667 assert(method() == if_hot->method(), "consistent choices");
668 _call_info = ci;
669 _if_cold = if_cold;
670 _if_hot = if_hot;
671 _is_virtual = if_cold->is_virtual();
672 _is_inline = if_hot->is_inline();
673 }
674
675 virtual bool is_inline() const { return _is_inline; }
676 virtual bool is_virtual() const { return _is_virtual; }
677 virtual bool is_deferred() const { return true; }
678
679 virtual JVMState* generate(JVMState* jvms);
680 };
681
682
683 CallGenerator* CallGenerator::for_warm_call(WarmCallInfo* ci,
684 CallGenerator* if_cold,
685 CallGenerator* if_hot) {
686 return new WarmCallGenerator(ci, if_cold, if_hot);
687 }
688
689 JVMState* WarmCallGenerator::generate(JVMState* jvms) {
690 Compile* C = Compile::current();
691 C->print_inlining_update(this);
692
693 if (C->log() != NULL) {
694 C->log()->elem("warm_call bci='%d'", jvms->bci());
695 }
696 jvms = _if_cold->generate(jvms);
697 if (jvms != NULL) {
698 Node* m = jvms->map()->control();
699 if (m->is_CatchProj()) m = m->in(0); else m = C->top();
700 if (m->is_Catch()) m = m->in(0); else m = C->top();
701 if (m->is_Proj()) m = m->in(0); else m = C->top();
702 if (m->is_CallJava()) {
703 _call_info->set_call(m->as_Call());
704 _call_info->set_hot_cg(_if_hot);
705 #ifndef PRODUCT
706 if (PrintOpto || PrintOptoInlining) {
707 tty->print_cr("Queueing for warm inlining at bci %d:", jvms->bci());
708 tty->print("WCI: ");
709 _call_info->print();
710 }
711 #endif
712 _call_info->set_heat(_call_info->compute_heat());
713 C->set_warm_calls(_call_info->insert_into(C->warm_calls()));
714 }
715 }
716 return jvms;
717 }
718
719 void WarmCallInfo::make_hot() {
720 Unimplemented();
721 }
722
723 void WarmCallInfo::make_cold() {
724 // No action: Just dequeue.
725 }
726
727
728 //------------------------PredictedCallGenerator------------------------------
729 // Internal class which handles all out-of-line calls checking receiver type.
730 class PredictedCallGenerator : public CallGenerator {
731 ciKlass* _predicted_receiver;
732 CallGenerator* _if_missed;
733 CallGenerator* _if_hit;
734 float _hit_prob;
735
736 public:
737 PredictedCallGenerator(ciKlass* predicted_receiver,
738 CallGenerator* if_missed,
739 CallGenerator* if_hit, float hit_prob)
740 : CallGenerator(if_missed->method())
741 {
742 // The call profile data may predict the hit_prob as extreme as 0 or 1.
743 // Remove the extremes values from the range.
744 if (hit_prob > PROB_MAX) hit_prob = PROB_MAX;
745 if (hit_prob < PROB_MIN) hit_prob = PROB_MIN;
746
747 _predicted_receiver = predicted_receiver;
748 _if_missed = if_missed;
749 _if_hit = if_hit;
750 _hit_prob = hit_prob;
751 }
752
753 virtual bool is_virtual() const { return true; }
754 virtual bool is_inline() const { return _if_hit->is_inline(); }
755 virtual bool is_deferred() const { return _if_hit->is_deferred(); }
756
757 virtual JVMState* generate(JVMState* jvms);
758 };
759
760
761 CallGenerator* CallGenerator::for_predicted_call(ciKlass* predicted_receiver,
762 CallGenerator* if_missed,
763 CallGenerator* if_hit,
764 float hit_prob) {
765 return new PredictedCallGenerator(predicted_receiver, if_missed, if_hit, hit_prob);
766 }
767
768
769 JVMState* PredictedCallGenerator::generate(JVMState* jvms) {
770 GraphKit kit(jvms);
771 kit.C->print_inlining_update(this);
772 PhaseGVN& gvn = kit.gvn();
773 // We need an explicit receiver null_check before checking its type.
774 // We share a map with the caller, so his JVMS gets adjusted.
775 Node* receiver = kit.argument(0);
776 CompileLog* log = kit.C->log();
777 if (log != NULL) {
778 log->elem("predicted_call bci='%d' klass='%d'",
779 jvms->bci(), log->identify(_predicted_receiver));
780 }
781
782 receiver = kit.null_check_receiver_before_call(method());
783 if (kit.stopped()) {
784 return kit.transfer_exceptions_into_jvms();
785 }
786
787 // Make a copy of the replaced nodes in case we need to restore them
788 ReplacedNodes replaced_nodes = kit.map()->replaced_nodes();
789 replaced_nodes.clone();
790
791 Node* exact_receiver = receiver; // will get updated in place...
792 Node* slow_ctl = kit.type_check_receiver(receiver,
793 _predicted_receiver, _hit_prob,
794 &exact_receiver);
795
796 SafePointNode* slow_map = NULL;
797 JVMState* slow_jvms = NULL;
798 { PreserveJVMState pjvms(&kit);
799 kit.set_control(slow_ctl);
800 if (!kit.stopped()) {
801 slow_jvms = _if_missed->generate(kit.sync_jvms());
802 if (kit.failing())
803 return NULL; // might happen because of NodeCountInliningCutoff
804 assert(slow_jvms != NULL, "must be");
805 kit.add_exception_states_from(slow_jvms);
806 kit.set_map(slow_jvms->map());
807 if (!kit.stopped())
808 slow_map = kit.stop();
809 }
810 }
811
812 if (kit.stopped()) {
813 // Instance exactly does not matches the desired type.
814 kit.set_jvms(slow_jvms);
815 return kit.transfer_exceptions_into_jvms();
816 }
817
818 // fall through if the instance exactly matches the desired type
819 kit.replace_in_map(receiver, exact_receiver);
820
821 // Make the hot call:
822 JVMState* new_jvms = _if_hit->generate(kit.sync_jvms());
823 if (new_jvms == NULL) {
824 // Inline failed, so make a direct call.
825 assert(_if_hit->is_inline(), "must have been a failed inline");
826 CallGenerator* cg = CallGenerator::for_direct_call(_if_hit->method());
827 new_jvms = cg->generate(kit.sync_jvms());
828 }
829 kit.add_exception_states_from(new_jvms);
830 kit.set_jvms(new_jvms);
831
832 // Need to merge slow and fast?
833 if (slow_map == NULL) {
834 // The fast path is the only path remaining.
835 return kit.transfer_exceptions_into_jvms();
836 }
837
838 if (kit.stopped()) {
839 // Inlined method threw an exception, so it's just the slow path after all.
840 kit.set_jvms(slow_jvms);
841 return kit.transfer_exceptions_into_jvms();
842 }
843
844 // There are 2 branches and the replaced nodes are only valid on
845 // one: restore the replaced nodes to what they were before the
846 // branch.
847 kit.map()->set_replaced_nodes(replaced_nodes);
848
849 // Finish the diamond.
850 kit.C->set_has_split_ifs(true); // Has chance for split-if optimization
851 RegionNode* region = new RegionNode(3);
852 region->init_req(1, kit.control());
853 region->init_req(2, slow_map->control());
854 kit.set_control(gvn.transform(region));
855 Node* iophi = PhiNode::make(region, kit.i_o(), Type::ABIO);
856 iophi->set_req(2, slow_map->i_o());
857 kit.set_i_o(gvn.transform(iophi));
858 // Merge memory
859 kit.merge_memory(slow_map->merged_memory(), region, 2);
860 // Transform new memory Phis.
861 for (MergeMemStream mms(kit.merged_memory()); mms.next_non_empty();) {
862 Node* phi = mms.memory();
863 if (phi->is_Phi() && phi->in(0) == region) {
864 mms.set_memory(gvn.transform(phi));
865 }
866 }
867 uint tos = kit.jvms()->stkoff() + kit.sp();
868 uint limit = slow_map->req();
869 for (uint i = TypeFunc::Parms; i < limit; i++) {
870 // Skip unused stack slots; fast forward to monoff();
871 if (i == tos) {
872 i = kit.jvms()->monoff();
873 if( i >= limit ) break;
874 }
875 Node* m = kit.map()->in(i);
876 Node* n = slow_map->in(i);
877 if (m != n) {
878 const Type* t = gvn.type(m)->meet_speculative(gvn.type(n));
879 Node* phi = PhiNode::make(region, m, t);
880 phi->set_req(2, n);
881 kit.map()->set_req(i, gvn.transform(phi));
882 }
883 }
884 return kit.transfer_exceptions_into_jvms();
885 }
886
887
888 CallGenerator* CallGenerator::for_method_handle_call(JVMState* jvms, ciMethod* caller, ciMethod* callee, bool delayed_forbidden) {
889 assert(callee->is_method_handle_intrinsic(), "for_method_handle_call mismatch");
890 bool input_not_const;
891 CallGenerator* cg = CallGenerator::for_method_handle_inline(jvms, caller, callee, input_not_const, false);
892 Compile* C = Compile::current();
893 if (cg != NULL) {
894 if (!delayed_forbidden && AlwaysIncrementalInline) {
895 return CallGenerator::for_late_inline(callee, cg);
896 } else {
897 return cg;
898 }
899 }
900 int bci = jvms->bci();
901 ciCallProfile profile = caller->call_profile_at_bci(bci);
902 int call_site_count = caller->scale_count(profile.count());
903
904 if (IncrementalInline && (AlwaysIncrementalInline ||
905 (call_site_count > 0 && (input_not_const || !C->inlining_incrementally() || C->over_inlining_cutoff())))) {
906 return CallGenerator::for_mh_late_inline(caller, callee, input_not_const);
907 } else {
908 // Out-of-line call.
909 return CallGenerator::for_direct_call(callee);
910 }
911 }
912
913 static void cast_argument(int arg_nb, ciType* t, GraphKit& kit) {
914 PhaseGVN& gvn = kit.gvn();
915 Node* arg = kit.argument(arg_nb);
916 const Type* arg_type = arg->bottom_type();
917 const Type* sig_type = TypeOopPtr::make_from_klass(t->as_klass());
918 if (t->is_valuetype()) {
919 assert(!(arg_type->isa_valuetype() && t->is__Value()), "need a pointer to the value type");
920 if (arg_type->isa_valuetypeptr() && !t->is__Value()) {
921 Node* cast = gvn.transform(new CheckCastPPNode(kit.control(), arg, sig_type));
922 Node* vt = ValueTypeNode::make(&kit, cast);
923 kit.set_argument(arg_nb, vt);
924 } else {
925 assert(t->is__Value() || arg->is_ValueType(), "inconsistent argument");
926 }
927 } else {
928 if (arg_type->isa_oopptr() && !arg_type->higher_equal(sig_type)) {
929 Node* cast_obj = gvn.transform(new CheckCastPPNode(kit.control(), arg, sig_type));
930 kit.set_argument(arg_nb, cast_obj);
931 }
932 }
933 }
934
935 CallGenerator* CallGenerator::for_method_handle_inline(JVMState* jvms, ciMethod* caller, ciMethod* callee, bool& input_not_const, bool delayed_forbidden) {
936 GraphKit kit(jvms);
937 PhaseGVN& gvn = kit.gvn();
938 Compile* C = kit.C;
939 vmIntrinsics::ID iid = callee->intrinsic_id();
940 input_not_const = true;
941 switch (iid) {
942 case vmIntrinsics::_invokeBasic:
943 {
944 // Get MethodHandle receiver:
945 Node* receiver = kit.argument(0);
946 if (receiver->Opcode() == Op_ConP) {
947 input_not_const = false;
948 const TypeOopPtr* oop_ptr = receiver->bottom_type()->is_oopptr();
949 ciMethod* target = oop_ptr->const_oop()->as_method_handle()->get_vmtarget();
950 const int vtable_index = Method::invalid_vtable_index;
951
952 if (!ciMethod::is_consistent_info(callee, target)) {
953 print_inlining_failure(C, callee, jvms->depth() - 1, jvms->bci(),
954 "signatures mismatch");
955 return NULL;
956 }
957
958 CallGenerator* cg = C->call_generator(target, vtable_index,
959 false /* call_does_dispatch */,
960 jvms,
961 true /* allow_inline */,
962 PROB_ALWAYS,
963 NULL,
964 true,
965 delayed_forbidden);
966 return cg;
967 } else {
968 print_inlining_failure(C, callee, jvms->depth() - 1, jvms->bci(),
969 "receiver not constant");
970 }
971 }
972 break;
973
974 case vmIntrinsics::_linkToVirtual:
975 case vmIntrinsics::_linkToStatic:
976 case vmIntrinsics::_linkToSpecial:
977 case vmIntrinsics::_linkToInterface:
978 {
979 // Get MemberName argument:
980 Node* member_name = kit.argument(callee->arg_size() - 1);
981 if (member_name->Opcode() == Op_ConP) {
982 input_not_const = false;
983 const TypeOopPtr* oop_ptr = member_name->bottom_type()->is_oopptr();
984 ciMethod* target = oop_ptr->const_oop()->as_member_name()->get_vmtarget();
985
986 if (!ciMethod::is_consistent_info(callee, target)) {
987 print_inlining_failure(C, callee, jvms->depth() - 1, jvms->bci(),
988 "signatures mismatch");
989 return NULL;
990 }
991
992 // In lambda forms we erase signature types to avoid resolving issues
993 // involving class loaders. When we optimize a method handle invoke
994 // to a direct call we must cast the receiver and arguments to its
995 // actual types.
996 ciSignature* signature = target->signature();
997 const int receiver_skip = target->is_static() ? 0 : 1;
998 // Cast receiver to its type.
999 if (!target->is_static()) {
1000 cast_argument(0, signature->accessing_klass(), kit);
1001 }
1002 // Cast reference arguments to its type.
1003 for (int i = 0, j = 0; i < signature->count(); i++) {
1004 ciType* t = signature->type_at(i);
1005 if (t->is_klass()) {
1006 cast_argument(receiver_skip + j, t, kit);
1007 }
1008 j += t->size(); // long and double take two slots
1009 }
1010
1011 // Try to get the most accurate receiver type
1012 const bool is_virtual = (iid == vmIntrinsics::_linkToVirtual);
1013 const bool is_virtual_or_interface = (is_virtual || iid == vmIntrinsics::_linkToInterface);
1014 int vtable_index = Method::invalid_vtable_index;
1015 bool call_does_dispatch = false;
1016
1017 ciKlass* speculative_receiver_type = NULL;
1018 if (is_virtual_or_interface) {
1019 ciInstanceKlass* klass = target->holder();
1020 Node* receiver_node = kit.argument(0);
1021 const TypeOopPtr* receiver_type = gvn.type(receiver_node)->isa_oopptr();
1022 // call_does_dispatch and vtable_index are out-parameters. They might be changed.
1023 // optimize_virtual_call() takes 2 different holder
1024 // arguments for a corner case that doesn't apply here (see
1025 // Parse::do_call())
1026 target = C->optimize_virtual_call(caller, jvms->bci(), klass, klass,
1027 target, receiver_type, is_virtual,
1028 call_does_dispatch, vtable_index, // out-parameters
1029 false /* check_access */);
1030 // We lack profiling at this call but type speculation may
1031 // provide us with a type
1032 speculative_receiver_type = (receiver_type != NULL) ? receiver_type->speculative_type() : NULL;
1033 }
1034 CallGenerator* cg = C->call_generator(target, vtable_index, call_does_dispatch, jvms,
1035 true /* allow_inline */,
1036 PROB_ALWAYS,
1037 speculative_receiver_type,
1038 true,
1039 delayed_forbidden);
1040 return cg;
1041 } else {
1042 print_inlining_failure(C, callee, jvms->depth() - 1, jvms->bci(),
1043 "member_name not constant");
1044 }
1045 }
1046 break;
1047
1048 default:
1049 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
1050 break;
1051 }
1052 return NULL;
1053 }
1054
1055
1056 //------------------------PredicatedIntrinsicGenerator------------------------------
1057 // Internal class which handles all predicated Intrinsic calls.
1058 class PredicatedIntrinsicGenerator : public CallGenerator {
1059 CallGenerator* _intrinsic;
1060 CallGenerator* _cg;
1061
1062 public:
1063 PredicatedIntrinsicGenerator(CallGenerator* intrinsic,
1064 CallGenerator* cg)
1065 : CallGenerator(cg->method())
1066 {
1067 _intrinsic = intrinsic;
1068 _cg = cg;
1069 }
1070
1071 virtual bool is_virtual() const { return true; }
1072 virtual bool is_inlined() const { return true; }
1073 virtual bool is_intrinsic() const { return true; }
1074
1075 virtual JVMState* generate(JVMState* jvms);
1076 };
1077
1078
1079 CallGenerator* CallGenerator::for_predicated_intrinsic(CallGenerator* intrinsic,
1080 CallGenerator* cg) {
1081 return new PredicatedIntrinsicGenerator(intrinsic, cg);
1082 }
1083
1084
1085 JVMState* PredicatedIntrinsicGenerator::generate(JVMState* jvms) {
1086 // The code we want to generate here is:
1087 // if (receiver == NULL)
1088 // uncommon_Trap
1089 // if (predicate(0))
1090 // do_intrinsic(0)
1091 // else
1092 // if (predicate(1))
1093 // do_intrinsic(1)
1094 // ...
1095 // else
1096 // do_java_comp
1097
1098 GraphKit kit(jvms);
1099 PhaseGVN& gvn = kit.gvn();
1100
1101 CompileLog* log = kit.C->log();
1102 if (log != NULL) {
1103 log->elem("predicated_intrinsic bci='%d' method='%d'",
1104 jvms->bci(), log->identify(method()));
1105 }
1106
1107 if (!method()->is_static()) {
1108 // We need an explicit receiver null_check before checking its type in predicate.
1109 // We share a map with the caller, so his JVMS gets adjusted.
1110 Node* receiver = kit.null_check_receiver_before_call(method());
1111 if (kit.stopped()) {
1112 return kit.transfer_exceptions_into_jvms();
1113 }
1114 }
1115
1116 int n_predicates = _intrinsic->predicates_count();
1117 assert(n_predicates > 0, "sanity");
1118
1119 JVMState** result_jvms = NEW_RESOURCE_ARRAY(JVMState*, (n_predicates+1));
1120
1121 // Region for normal compilation code if intrinsic failed.
1122 Node* slow_region = new RegionNode(1);
1123
1124 int results = 0;
1125 for (int predicate = 0; (predicate < n_predicates) && !kit.stopped(); predicate++) {
1126 #ifdef ASSERT
1127 JVMState* old_jvms = kit.jvms();
1128 SafePointNode* old_map = kit.map();
1129 Node* old_io = old_map->i_o();
1130 Node* old_mem = old_map->memory();
1131 Node* old_exc = old_map->next_exception();
1132 #endif
1133 Node* else_ctrl = _intrinsic->generate_predicate(kit.sync_jvms(), predicate);
1134 #ifdef ASSERT
1135 // Assert(no_new_memory && no_new_io && no_new_exceptions) after generate_predicate.
1136 assert(old_jvms == kit.jvms(), "generate_predicate should not change jvm state");
1137 SafePointNode* new_map = kit.map();
1138 assert(old_io == new_map->i_o(), "generate_predicate should not change i_o");
1139 assert(old_mem == new_map->memory(), "generate_predicate should not change memory");
1140 assert(old_exc == new_map->next_exception(), "generate_predicate should not add exceptions");
1141 #endif
1142 if (!kit.stopped()) {
1143 PreserveJVMState pjvms(&kit);
1144 // Generate intrinsic code:
1145 JVMState* new_jvms = _intrinsic->generate(kit.sync_jvms());
1146 if (new_jvms == NULL) {
1147 // Intrinsic failed, use normal compilation path for this predicate.
1148 slow_region->add_req(kit.control());
1149 } else {
1150 kit.add_exception_states_from(new_jvms);
1151 kit.set_jvms(new_jvms);
1152 if (!kit.stopped()) {
1153 result_jvms[results++] = kit.jvms();
1154 }
1155 }
1156 }
1157 if (else_ctrl == NULL) {
1158 else_ctrl = kit.C->top();
1159 }
1160 kit.set_control(else_ctrl);
1161 }
1162 if (!kit.stopped()) {
1163 // Final 'else' after predicates.
1164 slow_region->add_req(kit.control());
1165 }
1166 if (slow_region->req() > 1) {
1167 PreserveJVMState pjvms(&kit);
1168 // Generate normal compilation code:
1169 kit.set_control(gvn.transform(slow_region));
1170 JVMState* new_jvms = _cg->generate(kit.sync_jvms());
1171 if (kit.failing())
1172 return NULL; // might happen because of NodeCountInliningCutoff
1173 assert(new_jvms != NULL, "must be");
1174 kit.add_exception_states_from(new_jvms);
1175 kit.set_jvms(new_jvms);
1176 if (!kit.stopped()) {
1177 result_jvms[results++] = kit.jvms();
1178 }
1179 }
1180
1181 if (results == 0) {
1182 // All paths ended in uncommon traps.
1183 (void) kit.stop();
1184 return kit.transfer_exceptions_into_jvms();
1185 }
1186
1187 if (results == 1) { // Only one path
1188 kit.set_jvms(result_jvms[0]);
1189 return kit.transfer_exceptions_into_jvms();
1190 }
1191
1192 // Merge all paths.
1193 kit.C->set_has_split_ifs(true); // Has chance for split-if optimization
1194 RegionNode* region = new RegionNode(results + 1);
1195 Node* iophi = PhiNode::make(region, kit.i_o(), Type::ABIO);
1196 for (int i = 0; i < results; i++) {
1197 JVMState* jvms = result_jvms[i];
1198 int path = i + 1;
1199 SafePointNode* map = jvms->map();
1200 region->init_req(path, map->control());
1201 iophi->set_req(path, map->i_o());
1202 if (i == 0) {
1203 kit.set_jvms(jvms);
1204 } else {
1205 kit.merge_memory(map->merged_memory(), region, path);
1206 }
1207 }
1208 kit.set_control(gvn.transform(region));
1209 kit.set_i_o(gvn.transform(iophi));
1210 // Transform new memory Phis.
1211 for (MergeMemStream mms(kit.merged_memory()); mms.next_non_empty();) {
1212 Node* phi = mms.memory();
1213 if (phi->is_Phi() && phi->in(0) == region) {
1214 mms.set_memory(gvn.transform(phi));
1215 }
1216 }
1217
1218 // Merge debug info.
1219 Node** ins = NEW_RESOURCE_ARRAY(Node*, results);
1220 uint tos = kit.jvms()->stkoff() + kit.sp();
1221 Node* map = kit.map();
1222 uint limit = map->req();
1223 for (uint i = TypeFunc::Parms; i < limit; i++) {
1224 // Skip unused stack slots; fast forward to monoff();
1225 if (i == tos) {
1226 i = kit.jvms()->monoff();
1227 if( i >= limit ) break;
1228 }
1229 Node* n = map->in(i);
1230 ins[0] = n;
1231 const Type* t = gvn.type(n);
1232 bool needs_phi = false;
1233 for (int j = 1; j < results; j++) {
1234 JVMState* jvms = result_jvms[j];
1235 Node* jmap = jvms->map();
1236 Node* m = NULL;
1237 if (jmap->req() > i) {
1238 m = jmap->in(i);
1239 if (m != n) {
1240 needs_phi = true;
1241 t = t->meet_speculative(gvn.type(m));
1242 }
1243 }
1244 ins[j] = m;
1245 }
1246 if (needs_phi) {
1247 Node* phi = PhiNode::make(region, n, t);
1248 for (int j = 1; j < results; j++) {
1249 phi->set_req(j + 1, ins[j]);
1250 }
1251 map->set_req(i, gvn.transform(phi));
1252 }
1253 }
1254
1255 return kit.transfer_exceptions_into_jvms();
1256 }
1257
1258 //-------------------------UncommonTrapCallGenerator-----------------------------
1259 // Internal class which handles all out-of-line calls checking receiver type.
1260 class UncommonTrapCallGenerator : public CallGenerator {
1261 Deoptimization::DeoptReason _reason;
1262 Deoptimization::DeoptAction _action;
1263
1264 public:
1265 UncommonTrapCallGenerator(ciMethod* m,
1266 Deoptimization::DeoptReason reason,
1267 Deoptimization::DeoptAction action)
1268 : CallGenerator(m)
1269 {
1270 _reason = reason;
1271 _action = action;
1272 }
1273
1274 virtual bool is_virtual() const { ShouldNotReachHere(); return false; }
1275 virtual bool is_trap() const { return true; }
1276
1277 virtual JVMState* generate(JVMState* jvms);
1278 };
1279
1280
1281 CallGenerator*
1282 CallGenerator::for_uncommon_trap(ciMethod* m,
1283 Deoptimization::DeoptReason reason,
1284 Deoptimization::DeoptAction action) {
1285 return new UncommonTrapCallGenerator(m, reason, action);
1286 }
1287
1288
1289 JVMState* UncommonTrapCallGenerator::generate(JVMState* jvms) {
1290 GraphKit kit(jvms);
1291 kit.C->print_inlining_update(this);
1292 // Take the trap with arguments pushed on the stack. (Cf. null_check_receiver).
1293 // Callsite signature can be different from actual method being called (i.e _linkTo* sites).
1294 // Use callsite signature always.
1295 ciMethod* declared_method = kit.method()->get_method_at_bci(kit.bci());
1296 int nargs = declared_method->arg_size();
1297 kit.inc_sp(nargs);
1298 assert(nargs <= kit.sp() && kit.sp() <= jvms->stk_size(), "sane sp w/ args pushed");
1299 if (_reason == Deoptimization::Reason_class_check &&
1300 _action == Deoptimization::Action_maybe_recompile) {
1301 // Temp fix for 6529811
1302 // Don't allow uncommon_trap to override our decision to recompile in the event
1303 // of a class cast failure for a monomorphic call as it will never let us convert
1304 // the call to either bi-morphic or megamorphic and can lead to unc-trap loops
1305 bool keep_exact_action = true;
1306 kit.uncommon_trap(_reason, _action, NULL, "monomorphic vcall checkcast", false, keep_exact_action);
1307 } else {
1308 kit.uncommon_trap(_reason, _action);
1309 }
1310 return kit.transfer_exceptions_into_jvms();
1311 }
1312
1313 // (Note: Moved hook_up_call to GraphKit::set_edges_for_java_call.)
1314
1315 // (Node: Merged hook_up_exits into ParseGenerator::generate.)
1316
1317 #define NODES_OVERHEAD_PER_METHOD (30.0)
1318 #define NODES_PER_BYTECODE (9.5)
1319
1320 void WarmCallInfo::init(JVMState* call_site, ciMethod* call_method, ciCallProfile& profile, float prof_factor) {
1321 int call_count = profile.count();
1322 int code_size = call_method->code_size();
1323
1324 // Expected execution count is based on the historical count:
1325 _count = call_count < 0 ? 1 : call_site->method()->scale_count(call_count, prof_factor);
1326
1327 // Expected profit from inlining, in units of simple call-overheads.
1328 _profit = 1.0;
1329
1330 // Expected work performed by the call in units of call-overheads.
1331 // %%% need an empirical curve fit for "work" (time in call)
1332 float bytecodes_per_call = 3;
1333 _work = 1.0 + code_size / bytecodes_per_call;
1334
1335 // Expected size of compilation graph:
1336 // -XX:+PrintParseStatistics once reported:
1337 // Methods seen: 9184 Methods parsed: 9184 Nodes created: 1582391
1338 // Histogram of 144298 parsed bytecodes:
1339 // %%% Need an better predictor for graph size.
1340 _size = NODES_OVERHEAD_PER_METHOD + (NODES_PER_BYTECODE * code_size);
1341 }
1342
1343 // is_cold: Return true if the node should never be inlined.
1344 // This is true if any of the key metrics are extreme.
1345 bool WarmCallInfo::is_cold() const {
1346 if (count() < WarmCallMinCount) return true;
1347 if (profit() < WarmCallMinProfit) return true;
1348 if (work() > WarmCallMaxWork) return true;
1349 if (size() > WarmCallMaxSize) return true;
1350 return false;
1351 }
1352
1353 // is_hot: Return true if the node should be inlined immediately.
1354 // This is true if any of the key metrics are extreme.
1355 bool WarmCallInfo::is_hot() const {
1356 assert(!is_cold(), "eliminate is_cold cases before testing is_hot");
1357 if (count() >= HotCallCountThreshold) return true;
1358 if (profit() >= HotCallProfitThreshold) return true;
1359 if (work() <= HotCallTrivialWork) return true;
1360 if (size() <= HotCallTrivialSize) return true;
1361 return false;
1362 }
1363
1364 // compute_heat:
1365 float WarmCallInfo::compute_heat() const {
1366 assert(!is_cold(), "compute heat only on warm nodes");
1367 assert(!is_hot(), "compute heat only on warm nodes");
1368 int min_size = MAX2(0, (int)HotCallTrivialSize);
1369 int max_size = MIN2(500, (int)WarmCallMaxSize);
1370 float method_size = (size() - min_size) / MAX2(1, max_size - min_size);
1371 float size_factor;
1372 if (method_size < 0.05) size_factor = 4; // 2 sigmas better than avg.
1373 else if (method_size < 0.15) size_factor = 2; // 1 sigma better than avg.
1374 else if (method_size < 0.5) size_factor = 1; // better than avg.
1375 else size_factor = 0.5; // worse than avg.
1376 return (count() * profit() * size_factor);
1377 }
1378
1379 bool WarmCallInfo::warmer_than(WarmCallInfo* that) {
1380 assert(this != that, "compare only different WCIs");
1381 assert(this->heat() != 0 && that->heat() != 0, "call compute_heat 1st");
1382 if (this->heat() > that->heat()) return true;
1383 if (this->heat() < that->heat()) return false;
1384 assert(this->heat() == that->heat(), "no NaN heat allowed");
1385 // Equal heat. Break the tie some other way.
1386 if (!this->call() || !that->call()) return (address)this > (address)that;
1387 return this->call()->_idx > that->call()->_idx;
1388 }
1389
1390 //#define UNINIT_NEXT ((WarmCallInfo*)badAddress)
1391 #define UNINIT_NEXT ((WarmCallInfo*)NULL)
1392
1393 WarmCallInfo* WarmCallInfo::insert_into(WarmCallInfo* head) {
1394 assert(next() == UNINIT_NEXT, "not yet on any list");
1395 WarmCallInfo* prev_p = NULL;
1396 WarmCallInfo* next_p = head;
1397 while (next_p != NULL && next_p->warmer_than(this)) {
1398 prev_p = next_p;
1399 next_p = prev_p->next();
1400 }
1401 // Install this between prev_p and next_p.
1402 this->set_next(next_p);
1403 if (prev_p == NULL)
1404 head = this;
1405 else
1406 prev_p->set_next(this);
1407 return head;
1408 }
1409
1410 WarmCallInfo* WarmCallInfo::remove_from(WarmCallInfo* head) {
1411 WarmCallInfo* prev_p = NULL;
1412 WarmCallInfo* next_p = head;
1413 while (next_p != this) {
1414 assert(next_p != NULL, "this must be in the list somewhere");
1415 prev_p = next_p;
1416 next_p = prev_p->next();
1417 }
1418 next_p = this->next();
1419 debug_only(this->set_next(UNINIT_NEXT));
1420 // Remove this from between prev_p and next_p.
1421 if (prev_p == NULL)
1422 head = next_p;
1423 else
1424 prev_p->set_next(next_p);
1425 return head;
1426 }
1427
1428 WarmCallInfo WarmCallInfo::_always_hot(WarmCallInfo::MAX_VALUE(), WarmCallInfo::MAX_VALUE(),
1429 WarmCallInfo::MIN_VALUE(), WarmCallInfo::MIN_VALUE());
1430 WarmCallInfo WarmCallInfo::_always_cold(WarmCallInfo::MIN_VALUE(), WarmCallInfo::MIN_VALUE(),
1431 WarmCallInfo::MAX_VALUE(), WarmCallInfo::MAX_VALUE());
1432
1433 WarmCallInfo* WarmCallInfo::always_hot() {
1434 assert(_always_hot.is_hot(), "must always be hot");
1435 return &_always_hot;
1436 }
1437
1438 WarmCallInfo* WarmCallInfo::always_cold() {
1439 assert(_always_cold.is_cold(), "must always be cold");
1440 return &_always_cold;
1441 }
1442
1443
1444 #ifndef PRODUCT
1445
1446 void WarmCallInfo::print() const {
1447 tty->print("%s : C=%6.1f P=%6.1f W=%6.1f S=%6.1f H=%6.1f -> %p",
1448 is_cold() ? "cold" : is_hot() ? "hot " : "warm",
1449 count(), profit(), work(), size(), compute_heat(), next());
1450 tty->cr();
1451 if (call() != NULL) call()->dump();
1452 }
1453
1454 void print_wci(WarmCallInfo* ci) {
1455 ci->print();
1456 }
1457
1458 void WarmCallInfo::print_all() const {
1459 for (const WarmCallInfo* p = this; p != NULL; p = p->next())
1460 p->print();
1461 }
1462
1463 int WarmCallInfo::count_all() const {
1464 int cnt = 0;
1465 for (const WarmCallInfo* p = this; p != NULL; p = p->next())
1466 cnt++;
1467 return cnt;
1468 }
1469
1470 #endif //PRODUCT