1 /*
2 * Copyright (c) 1997, 2025, 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 "asm/macroAssembler.hpp"
26 #include "asm/macroAssembler.inline.hpp"
27 #include "ci/ciReplay.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "code/exceptionHandlerTable.hpp"
30 #include "code/nmethod.hpp"
31 #include "compiler/compilationFailureInfo.hpp"
32 #include "compiler/compilationMemoryStatistic.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerOracle.hpp"
36 #include "compiler/compiler_globals.hpp"
37 #include "compiler/disassembler.hpp"
38 #include "compiler/oopMap.hpp"
39 #include "gc/shared/barrierSet.hpp"
40 #include "gc/shared/c2/barrierSetC2.hpp"
41 #include "jfr/jfrEvents.hpp"
42 #include "jvm_io.h"
43 #include "memory/allocation.hpp"
44 #include "memory/arena.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "opto/addnode.hpp"
47 #include "opto/block.hpp"
48 #include "opto/c2compiler.hpp"
49 #include "opto/callGenerator.hpp"
50 #include "opto/callnode.hpp"
51 #include "opto/castnode.hpp"
52 #include "opto/cfgnode.hpp"
53 #include "opto/chaitin.hpp"
54 #include "opto/compile.hpp"
55 #include "opto/connode.hpp"
56 #include "opto/convertnode.hpp"
57 #include "opto/divnode.hpp"
58 #include "opto/escape.hpp"
59 #include "opto/idealGraphPrinter.hpp"
60 #include "opto/inlinetypenode.hpp"
61 #include "opto/locknode.hpp"
62 #include "opto/loopnode.hpp"
63 #include "opto/machnode.hpp"
64 #include "opto/macro.hpp"
65 #include "opto/matcher.hpp"
66 #include "opto/mathexactnode.hpp"
67 #include "opto/memnode.hpp"
68 #include "opto/movenode.hpp"
69 #include "opto/mulnode.hpp"
70 #include "opto/narrowptrnode.hpp"
71 #include "opto/node.hpp"
72 #include "opto/opaquenode.hpp"
73 #include "opto/opcodes.hpp"
74 #include "opto/output.hpp"
75 #include "opto/parse.hpp"
76 #include "opto/phaseX.hpp"
77 #include "opto/rootnode.hpp"
78 #include "opto/runtime.hpp"
79 #include "opto/stringopts.hpp"
80 #include "opto/type.hpp"
81 #include "opto/vector.hpp"
82 #include "opto/vectornode.hpp"
83 #include "runtime/globals_extension.hpp"
84 #include "runtime/sharedRuntime.hpp"
85 #include "runtime/signature.hpp"
86 #include "runtime/stubRoutines.hpp"
87 #include "runtime/timer.hpp"
88 #include "utilities/align.hpp"
89 #include "utilities/copy.hpp"
90 #include "utilities/macros.hpp"
91 #include "utilities/resourceHash.hpp"
92
93 // -------------------- Compile::mach_constant_base_node -----------------------
94 // Constant table base node singleton.
95 MachConstantBaseNode* Compile::mach_constant_base_node() {
96 if (_mach_constant_base_node == nullptr) {
97 _mach_constant_base_node = new MachConstantBaseNode();
98 _mach_constant_base_node->add_req(C->root());
99 }
100 return _mach_constant_base_node;
101 }
102
103
104 /// Support for intrinsics.
105
106 // Return the index at which m must be inserted (or already exists).
107 // The sort order is by the address of the ciMethod, with is_virtual as minor key.
108 class IntrinsicDescPair {
109 private:
110 ciMethod* _m;
111 bool _is_virtual;
112 public:
113 IntrinsicDescPair(ciMethod* m, bool is_virtual) : _m(m), _is_virtual(is_virtual) {}
114 static int compare(IntrinsicDescPair* const& key, CallGenerator* const& elt) {
115 ciMethod* m= elt->method();
116 ciMethod* key_m = key->_m;
117 if (key_m < m) return -1;
118 else if (key_m > m) return 1;
119 else {
120 bool is_virtual = elt->is_virtual();
121 bool key_virtual = key->_is_virtual;
122 if (key_virtual < is_virtual) return -1;
123 else if (key_virtual > is_virtual) return 1;
124 else return 0;
125 }
126 }
127 };
128 int Compile::intrinsic_insertion_index(ciMethod* m, bool is_virtual, bool& found) {
129 #ifdef ASSERT
130 for (int i = 1; i < _intrinsics.length(); i++) {
131 CallGenerator* cg1 = _intrinsics.at(i-1);
132 CallGenerator* cg2 = _intrinsics.at(i);
133 assert(cg1->method() != cg2->method()
134 ? cg1->method() < cg2->method()
135 : cg1->is_virtual() < cg2->is_virtual(),
136 "compiler intrinsics list must stay sorted");
137 }
138 #endif
139 IntrinsicDescPair pair(m, is_virtual);
140 return _intrinsics.find_sorted<IntrinsicDescPair*, IntrinsicDescPair::compare>(&pair, found);
141 }
142
143 void Compile::register_intrinsic(CallGenerator* cg) {
144 bool found = false;
145 int index = intrinsic_insertion_index(cg->method(), cg->is_virtual(), found);
146 assert(!found, "registering twice");
147 _intrinsics.insert_before(index, cg);
148 assert(find_intrinsic(cg->method(), cg->is_virtual()) == cg, "registration worked");
149 }
150
151 CallGenerator* Compile::find_intrinsic(ciMethod* m, bool is_virtual) {
152 assert(m->is_loaded(), "don't try this on unloaded methods");
153 if (_intrinsics.length() > 0) {
154 bool found = false;
155 int index = intrinsic_insertion_index(m, is_virtual, found);
156 if (found) {
157 return _intrinsics.at(index);
158 }
159 }
160 // Lazily create intrinsics for intrinsic IDs well-known in the runtime.
161 if (m->intrinsic_id() != vmIntrinsics::_none &&
162 m->intrinsic_id() <= vmIntrinsics::LAST_COMPILER_INLINE) {
163 CallGenerator* cg = make_vm_intrinsic(m, is_virtual);
164 if (cg != nullptr) {
165 // Save it for next time:
166 register_intrinsic(cg);
167 return cg;
168 } else {
169 gather_intrinsic_statistics(m->intrinsic_id(), is_virtual, _intrinsic_disabled);
170 }
171 }
172 return nullptr;
173 }
174
175 // Compile::make_vm_intrinsic is defined in library_call.cpp.
176
177 #ifndef PRODUCT
178 // statistics gathering...
179
180 juint Compile::_intrinsic_hist_count[vmIntrinsics::number_of_intrinsics()] = {0};
181 jubyte Compile::_intrinsic_hist_flags[vmIntrinsics::number_of_intrinsics()] = {0};
182
183 inline int as_int(vmIntrinsics::ID id) {
184 return vmIntrinsics::as_int(id);
185 }
186
187 bool Compile::gather_intrinsic_statistics(vmIntrinsics::ID id, bool is_virtual, int flags) {
188 assert(id > vmIntrinsics::_none && id < vmIntrinsics::ID_LIMIT, "oob");
189 int oflags = _intrinsic_hist_flags[as_int(id)];
190 assert(flags != 0, "what happened?");
191 if (is_virtual) {
192 flags |= _intrinsic_virtual;
193 }
194 bool changed = (flags != oflags);
195 if ((flags & _intrinsic_worked) != 0) {
196 juint count = (_intrinsic_hist_count[as_int(id)] += 1);
197 if (count == 1) {
198 changed = true; // first time
199 }
200 // increment the overall count also:
201 _intrinsic_hist_count[as_int(vmIntrinsics::_none)] += 1;
202 }
203 if (changed) {
204 if (((oflags ^ flags) & _intrinsic_virtual) != 0) {
205 // Something changed about the intrinsic's virtuality.
206 if ((flags & _intrinsic_virtual) != 0) {
207 // This is the first use of this intrinsic as a virtual call.
208 if (oflags != 0) {
209 // We already saw it as a non-virtual, so note both cases.
210 flags |= _intrinsic_both;
211 }
212 } else if ((oflags & _intrinsic_both) == 0) {
213 // This is the first use of this intrinsic as a non-virtual
214 flags |= _intrinsic_both;
215 }
216 }
217 _intrinsic_hist_flags[as_int(id)] = (jubyte) (oflags | flags);
218 }
219 // update the overall flags also:
220 _intrinsic_hist_flags[as_int(vmIntrinsics::_none)] |= (jubyte) flags;
221 return changed;
222 }
223
224 static char* format_flags(int flags, char* buf) {
225 buf[0] = 0;
226 if ((flags & Compile::_intrinsic_worked) != 0) strcat(buf, ",worked");
227 if ((flags & Compile::_intrinsic_failed) != 0) strcat(buf, ",failed");
228 if ((flags & Compile::_intrinsic_disabled) != 0) strcat(buf, ",disabled");
229 if ((flags & Compile::_intrinsic_virtual) != 0) strcat(buf, ",virtual");
230 if ((flags & Compile::_intrinsic_both) != 0) strcat(buf, ",nonvirtual");
231 if (buf[0] == 0) strcat(buf, ",");
232 assert(buf[0] == ',', "must be");
233 return &buf[1];
234 }
235
236 void Compile::print_intrinsic_statistics() {
237 char flagsbuf[100];
238 ttyLocker ttyl;
239 if (xtty != nullptr) xtty->head("statistics type='intrinsic'");
240 tty->print_cr("Compiler intrinsic usage:");
241 juint total = _intrinsic_hist_count[as_int(vmIntrinsics::_none)];
242 if (total == 0) total = 1; // avoid div0 in case of no successes
243 #define PRINT_STAT_LINE(name, c, f) \
244 tty->print_cr(" %4d (%4.1f%%) %s (%s)", (int)(c), ((c) * 100.0) / total, name, f);
245 for (auto id : EnumRange<vmIntrinsicID>{}) {
246 int flags = _intrinsic_hist_flags[as_int(id)];
247 juint count = _intrinsic_hist_count[as_int(id)];
248 if ((flags | count) != 0) {
249 PRINT_STAT_LINE(vmIntrinsics::name_at(id), count, format_flags(flags, flagsbuf));
250 }
251 }
252 PRINT_STAT_LINE("total", total, format_flags(_intrinsic_hist_flags[as_int(vmIntrinsics::_none)], flagsbuf));
253 if (xtty != nullptr) xtty->tail("statistics");
254 }
255
256 void Compile::print_statistics() {
257 { ttyLocker ttyl;
258 if (xtty != nullptr) xtty->head("statistics type='opto'");
259 Parse::print_statistics();
260 PhaseStringOpts::print_statistics();
261 PhaseCCP::print_statistics();
262 PhaseRegAlloc::print_statistics();
263 PhaseOutput::print_statistics();
264 PhasePeephole::print_statistics();
265 PhaseIdealLoop::print_statistics();
266 ConnectionGraph::print_statistics();
267 PhaseMacroExpand::print_statistics();
268 if (xtty != nullptr) xtty->tail("statistics");
269 }
270 if (_intrinsic_hist_flags[as_int(vmIntrinsics::_none)] != 0) {
271 // put this under its own <statistics> element.
272 print_intrinsic_statistics();
273 }
274 }
275 #endif //PRODUCT
276
277 void Compile::gvn_replace_by(Node* n, Node* nn) {
278 for (DUIterator_Last imin, i = n->last_outs(imin); i >= imin; ) {
279 Node* use = n->last_out(i);
280 bool is_in_table = initial_gvn()->hash_delete(use);
281 uint uses_found = 0;
282 for (uint j = 0; j < use->len(); j++) {
283 if (use->in(j) == n) {
284 if (j < use->req())
285 use->set_req(j, nn);
286 else
287 use->set_prec(j, nn);
288 uses_found++;
289 }
290 }
291 if (is_in_table) {
292 // reinsert into table
293 initial_gvn()->hash_find_insert(use);
294 }
295 record_for_igvn(use);
296 PhaseIterGVN::add_users_of_use_to_worklist(nn, use, *_igvn_worklist);
297 i -= uses_found; // we deleted 1 or more copies of this edge
298 }
299 }
300
301
302 // Identify all nodes that are reachable from below, useful.
303 // Use breadth-first pass that records state in a Unique_Node_List,
304 // recursive traversal is slower.
305 void Compile::identify_useful_nodes(Unique_Node_List &useful) {
306 int estimated_worklist_size = live_nodes();
307 useful.map( estimated_worklist_size, nullptr ); // preallocate space
308
309 // Initialize worklist
310 if (root() != nullptr) { useful.push(root()); }
311 // If 'top' is cached, declare it useful to preserve cached node
312 if (cached_top_node()) { useful.push(cached_top_node()); }
313
314 // Push all useful nodes onto the list, breadthfirst
315 for( uint next = 0; next < useful.size(); ++next ) {
316 assert( next < unique(), "Unique useful nodes < total nodes");
317 Node *n = useful.at(next);
318 uint max = n->len();
319 for( uint i = 0; i < max; ++i ) {
320 Node *m = n->in(i);
321 if (not_a_node(m)) continue;
322 useful.push(m);
323 }
324 }
325 }
326
327 // Update dead_node_list with any missing dead nodes using useful
328 // list. Consider all non-useful nodes to be useless i.e., dead nodes.
329 void Compile::update_dead_node_list(Unique_Node_List &useful) {
330 uint max_idx = unique();
331 VectorSet& useful_node_set = useful.member_set();
332
333 for (uint node_idx = 0; node_idx < max_idx; node_idx++) {
334 // If node with index node_idx is not in useful set,
335 // mark it as dead in dead node list.
336 if (!useful_node_set.test(node_idx)) {
337 record_dead_node(node_idx);
338 }
339 }
340 }
341
342 void Compile::remove_useless_late_inlines(GrowableArray<CallGenerator*>* inlines, Unique_Node_List &useful) {
343 int shift = 0;
344 for (int i = 0; i < inlines->length(); i++) {
345 CallGenerator* cg = inlines->at(i);
346 if (useful.member(cg->call_node())) {
347 if (shift > 0) {
348 inlines->at_put(i - shift, cg);
349 }
350 } else {
351 shift++; // skip over the dead element
352 }
353 }
354 if (shift > 0) {
355 inlines->trunc_to(inlines->length() - shift); // remove last elements from compacted array
356 }
357 }
358
359 void Compile::remove_useless_late_inlines(GrowableArray<CallGenerator*>* inlines, Node* dead) {
360 assert(dead != nullptr && dead->is_Call(), "sanity");
361 int found = 0;
362 for (int i = 0; i < inlines->length(); i++) {
363 if (inlines->at(i)->call_node() == dead) {
364 inlines->remove_at(i);
365 found++;
366 NOT_DEBUG( break; ) // elements are unique, so exit early
367 }
368 }
369 assert(found <= 1, "not unique");
370 }
371
372 template<typename N, ENABLE_IF_SDEFN(std::is_base_of<Node, N>::value)>
373 void Compile::remove_useless_nodes(GrowableArray<N*>& node_list, Unique_Node_List& useful) {
374 for (int i = node_list.length() - 1; i >= 0; i--) {
375 N* node = node_list.at(i);
376 if (!useful.member(node)) {
377 node_list.delete_at(i); // replaces i-th with last element which is known to be useful (already processed)
378 }
379 }
380 }
381
382 void Compile::remove_useless_node(Node* dead) {
383 remove_modified_node(dead);
384
385 // Constant node that has no out-edges and has only one in-edge from
386 // root is usually dead. However, sometimes reshaping walk makes
387 // it reachable by adding use edges. So, we will NOT count Con nodes
388 // as dead to be conservative about the dead node count at any
389 // given time.
390 if (!dead->is_Con()) {
391 record_dead_node(dead->_idx);
392 }
393 if (dead->is_macro()) {
394 remove_macro_node(dead);
395 }
396 if (dead->is_expensive()) {
397 remove_expensive_node(dead);
398 }
399 if (dead->is_OpaqueTemplateAssertionPredicate()) {
400 remove_template_assertion_predicate_opaque(dead->as_OpaqueTemplateAssertionPredicate());
401 }
402 if (dead->is_ParsePredicate()) {
403 remove_parse_predicate(dead->as_ParsePredicate());
404 }
405 if (dead->for_post_loop_opts_igvn()) {
406 remove_from_post_loop_opts_igvn(dead);
407 }
408 if (dead->is_InlineType()) {
409 remove_inline_type(dead);
410 }
411 if (dead->for_merge_stores_igvn()) {
412 remove_from_merge_stores_igvn(dead);
413 }
414 if (dead->is_Call()) {
415 remove_useless_late_inlines( &_late_inlines, dead);
416 remove_useless_late_inlines( &_string_late_inlines, dead);
417 remove_useless_late_inlines( &_boxing_late_inlines, dead);
418 remove_useless_late_inlines(&_vector_reboxing_late_inlines, dead);
419
420 if (dead->is_CallStaticJava()) {
421 remove_unstable_if_trap(dead->as_CallStaticJava(), false);
422 }
423 }
424 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
425 bs->unregister_potential_barrier_node(dead);
426 }
427
428 // Disconnect all useless nodes by disconnecting those at the boundary.
429 void Compile::disconnect_useless_nodes(Unique_Node_List& useful, Unique_Node_List& worklist, const Unique_Node_List* root_and_safepoints) {
430 uint next = 0;
431 while (next < useful.size()) {
432 Node *n = useful.at(next++);
433 if (n->is_SafePoint()) {
434 // We're done with a parsing phase. Replaced nodes are not valid
435 // beyond that point.
436 n->as_SafePoint()->delete_replaced_nodes();
437 }
438 // Use raw traversal of out edges since this code removes out edges
439 int max = n->outcnt();
440 for (int j = 0; j < max; ++j) {
441 Node* child = n->raw_out(j);
442 if (!useful.member(child)) {
443 assert(!child->is_top() || child != top(),
444 "If top is cached in Compile object it is in useful list");
445 // Only need to remove this out-edge to the useless node
446 n->raw_del_out(j);
447 --j;
448 --max;
449 if (child->is_data_proj_of_pure_function(n)) {
450 worklist.push(n);
451 }
452 }
453 }
454 if (n->outcnt() == 1 && n->has_special_unique_user()) {
455 assert(useful.member(n->unique_out()), "do not push a useless node");
456 worklist.push(n->unique_out());
457 }
458 if (n->outcnt() == 0) {
459 worklist.push(n);
460 }
461 }
462
463 remove_useless_nodes(_macro_nodes, useful); // remove useless macro nodes
464 remove_useless_nodes(_parse_predicates, useful); // remove useless Parse Predicate nodes
465 // Remove useless Template Assertion Predicate opaque nodes
466 remove_useless_nodes(_template_assertion_predicate_opaques, useful);
467 remove_useless_nodes(_expensive_nodes, useful); // remove useless expensive nodes
468 remove_useless_nodes(_for_post_loop_igvn, useful); // remove useless node recorded for post loop opts IGVN pass
469 remove_useless_nodes(_inline_type_nodes, useful); // remove useless inline type nodes
470 #ifdef ASSERT
471 if (_modified_nodes != nullptr) {
472 _modified_nodes->remove_useless_nodes(useful.member_set());
473 }
474 #endif
475 remove_useless_nodes(_for_merge_stores_igvn, useful); // remove useless node recorded for merge stores IGVN pass
476 remove_useless_unstable_if_traps(useful); // remove useless unstable_if traps
477 remove_useless_coarsened_locks(useful); // remove useless coarsened locks nodes
478 #ifdef ASSERT
479 if (_modified_nodes != nullptr) {
480 _modified_nodes->remove_useless_nodes(useful.member_set());
481 }
482 #endif
483
484 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
485 bs->eliminate_useless_gc_barriers(useful, this);
486 // clean up the late inline lists
487 remove_useless_late_inlines( &_late_inlines, useful);
488 remove_useless_late_inlines( &_string_late_inlines, useful);
489 remove_useless_late_inlines( &_boxing_late_inlines, useful);
490 remove_useless_late_inlines(&_vector_reboxing_late_inlines, useful);
491 DEBUG_ONLY(verify_graph_edges(true /*check for no_dead_code*/, root_and_safepoints);)
492 }
493
494 // ============================================================================
495 //------------------------------CompileWrapper---------------------------------
496 class CompileWrapper : public StackObj {
497 Compile *const _compile;
498 public:
499 CompileWrapper(Compile* compile);
500
501 ~CompileWrapper();
502 };
503
504 CompileWrapper::CompileWrapper(Compile* compile) : _compile(compile) {
505 // the Compile* pointer is stored in the current ciEnv:
506 ciEnv* env = compile->env();
507 assert(env == ciEnv::current(), "must already be a ciEnv active");
508 assert(env->compiler_data() == nullptr, "compile already active?");
509 env->set_compiler_data(compile);
510 assert(compile == Compile::current(), "sanity");
511
512 compile->set_type_dict(nullptr);
513 compile->set_clone_map(new Dict(cmpkey, hashkey, _compile->comp_arena()));
514 compile->clone_map().set_clone_idx(0);
515 compile->set_type_last_size(0);
516 compile->set_last_tf(nullptr, nullptr);
517 compile->set_indexSet_arena(nullptr);
518 compile->set_indexSet_free_block_list(nullptr);
519 compile->init_type_arena();
520 Type::Initialize(compile);
521 _compile->begin_method();
522 _compile->clone_map().set_debug(_compile->has_method() && _compile->directive()->CloneMapDebugOption);
523 }
524 CompileWrapper::~CompileWrapper() {
525 // simulate crash during compilation
526 assert(CICrashAt < 0 || _compile->compile_id() != CICrashAt, "just as planned");
527
528 _compile->end_method();
529 _compile->env()->set_compiler_data(nullptr);
530 }
531
532
533 //----------------------------print_compile_messages---------------------------
534 void Compile::print_compile_messages() {
535 #ifndef PRODUCT
536 // Check if recompiling
537 if (!subsume_loads() && PrintOpto) {
538 // Recompiling without allowing machine instructions to subsume loads
539 tty->print_cr("*********************************************************");
540 tty->print_cr("** Bailout: Recompile without subsuming loads **");
541 tty->print_cr("*********************************************************");
542 }
543 if ((do_escape_analysis() != DoEscapeAnalysis) && PrintOpto) {
544 // Recompiling without escape analysis
545 tty->print_cr("*********************************************************");
546 tty->print_cr("** Bailout: Recompile without escape analysis **");
547 tty->print_cr("*********************************************************");
548 }
549 if (do_iterative_escape_analysis() != DoEscapeAnalysis && PrintOpto) {
550 // Recompiling without iterative escape analysis
551 tty->print_cr("*********************************************************");
552 tty->print_cr("** Bailout: Recompile without iterative escape analysis**");
553 tty->print_cr("*********************************************************");
554 }
555 if (do_reduce_allocation_merges() != ReduceAllocationMerges && PrintOpto) {
556 // Recompiling without reducing allocation merges
557 tty->print_cr("*********************************************************");
558 tty->print_cr("** Bailout: Recompile without reduce allocation merges **");
559 tty->print_cr("*********************************************************");
560 }
561 if ((eliminate_boxing() != EliminateAutoBox) && PrintOpto) {
562 // Recompiling without boxing elimination
563 tty->print_cr("*********************************************************");
564 tty->print_cr("** Bailout: Recompile without boxing elimination **");
565 tty->print_cr("*********************************************************");
566 }
567 if ((do_locks_coarsening() != EliminateLocks) && PrintOpto) {
568 // Recompiling without locks coarsening
569 tty->print_cr("*********************************************************");
570 tty->print_cr("** Bailout: Recompile without locks coarsening **");
571 tty->print_cr("*********************************************************");
572 }
573 if (env()->break_at_compile()) {
574 // Open the debugger when compiling this method.
575 tty->print("### Breaking when compiling: ");
576 method()->print_short_name();
577 tty->cr();
578 BREAKPOINT;
579 }
580
581 if( PrintOpto ) {
582 if (is_osr_compilation()) {
583 tty->print("[OSR]%3d", _compile_id);
584 } else {
585 tty->print("%3d", _compile_id);
586 }
587 }
588 #endif
589 }
590
591 #ifndef PRODUCT
592 void Compile::print_ideal_ir(const char* phase_name) {
593 // keep the following output all in one block
594 // This output goes directly to the tty, not the compiler log.
595 // To enable tools to match it up with the compilation activity,
596 // be sure to tag this tty output with the compile ID.
597
598 // Node dumping can cause a safepoint, which can break the tty lock.
599 // Buffer all node dumps, so that all safepoints happen before we lock.
600 ResourceMark rm;
601 stringStream ss;
602
603 if (_output == nullptr) {
604 ss.print_cr("AFTER: %s", phase_name);
605 // Print out all nodes in ascending order of index.
606 root()->dump_bfs(MaxNodeLimit, nullptr, "+S$", &ss);
607 } else {
608 // Dump the node blockwise if we have a scheduling
609 _output->print_scheduling(&ss);
610 }
611
612 // Check that the lock is not broken by a safepoint.
613 NoSafepointVerifier nsv;
614 ttyLocker ttyl;
615 if (xtty != nullptr) {
616 xtty->head("ideal compile_id='%d'%s compile_phase='%s'",
617 compile_id(),
618 is_osr_compilation() ? " compile_kind='osr'" : "",
619 phase_name);
620 }
621
622 tty->print("%s", ss.as_string());
623
624 if (xtty != nullptr) {
625 xtty->tail("ideal");
626 }
627 }
628 #endif
629
630 // ============================================================================
631 //------------------------------Compile standard-------------------------------
632
633 // Compile a method. entry_bci is -1 for normal compilations and indicates
634 // the continuation bci for on stack replacement.
635
636
637 Compile::Compile(ciEnv* ci_env, ciMethod* target, int osr_bci,
638 Options options, DirectiveSet* directive)
639 : Phase(Compiler),
640 _compile_id(ci_env->compile_id()),
641 _options(options),
642 _method(target),
643 _entry_bci(osr_bci),
644 _ilt(nullptr),
645 _stub_function(nullptr),
646 _stub_name(nullptr),
647 _stub_entry_point(nullptr),
648 _max_node_limit(MaxNodeLimit),
649 _post_loop_opts_phase(false),
650 _merge_stores_phase(false),
651 _allow_macro_nodes(true),
652 _inlining_progress(false),
653 _inlining_incrementally(false),
654 _do_cleanup(false),
655 _has_reserved_stack_access(target->has_reserved_stack_access()),
656 _has_circular_inline_type(false),
657 #ifndef PRODUCT
658 _igv_idx(0),
659 _trace_opto_output(directive->TraceOptoOutputOption),
660 #endif
661 _has_method_handle_invokes(false),
662 _clinit_barrier_on_entry(false),
663 _stress_seed(0),
664 _comp_arena(mtCompiler, Arena::Tag::tag_comp),
665 _barrier_set_state(BarrierSet::barrier_set()->barrier_set_c2()->create_barrier_state(comp_arena())),
666 _env(ci_env),
667 _directive(directive),
668 _log(ci_env->log()),
669 _first_failure_details(nullptr),
670 _intrinsics(comp_arena(), 0, 0, nullptr),
671 _macro_nodes(comp_arena(), 8, 0, nullptr),
672 _parse_predicates(comp_arena(), 8, 0, nullptr),
673 _template_assertion_predicate_opaques(comp_arena(), 8, 0, nullptr),
674 _expensive_nodes(comp_arena(), 8, 0, nullptr),
675 _for_post_loop_igvn(comp_arena(), 8, 0, nullptr),
676 _inline_type_nodes (comp_arena(), 8, 0, nullptr),
677 _for_merge_stores_igvn(comp_arena(), 8, 0, nullptr),
678 _unstable_if_traps(comp_arena(), 8, 0, nullptr),
679 _coarsened_locks(comp_arena(), 8, 0, nullptr),
680 _congraph(nullptr),
681 NOT_PRODUCT(_igv_printer(nullptr) COMMA)
682 _unique(0),
683 _dead_node_count(0),
684 _dead_node_list(comp_arena()),
685 _node_arena_one(mtCompiler, Arena::Tag::tag_node),
686 _node_arena_two(mtCompiler, Arena::Tag::tag_node),
687 _node_arena(&_node_arena_one),
688 _mach_constant_base_node(nullptr),
689 _Compile_types(mtCompiler, Arena::Tag::tag_type),
690 _initial_gvn(nullptr),
691 _igvn_worklist(nullptr),
692 _types(nullptr),
693 _node_hash(nullptr),
694 _late_inlines(comp_arena(), 2, 0, nullptr),
695 _string_late_inlines(comp_arena(), 2, 0, nullptr),
696 _boxing_late_inlines(comp_arena(), 2, 0, nullptr),
697 _vector_reboxing_late_inlines(comp_arena(), 2, 0, nullptr),
698 _late_inlines_pos(0),
699 _number_of_mh_late_inlines(0),
700 _oom(false),
701 _replay_inline_data(nullptr),
702 _inline_printer(this),
703 _java_calls(0),
704 _inner_loops(0),
705 _interpreter_frame_size(0),
706 _output(nullptr)
707 #ifndef PRODUCT
708 ,
709 _in_dump_cnt(0)
710 #endif
711 {
712 C = this;
713 CompileWrapper cw(this);
714
715 TraceTime t1("Total compilation time", &_t_totalCompilation, CITime, CITimeVerbose);
716 TraceTime t2(nullptr, &_t_methodCompilation, CITime, false);
717
718 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
719 bool print_opto_assembly = directive->PrintOptoAssemblyOption;
720 // We can always print a disassembly, either abstract (hex dump) or
721 // with the help of a suitable hsdis library. Thus, we should not
722 // couple print_assembly and print_opto_assembly controls.
723 // But: always print opto and regular assembly on compile command 'print'.
724 bool print_assembly = directive->PrintAssemblyOption;
725 set_print_assembly(print_opto_assembly || print_assembly);
726 #else
727 set_print_assembly(false); // must initialize.
728 #endif
729
730 #ifndef PRODUCT
731 set_parsed_irreducible_loop(false);
732 #endif
733
734 if (directive->ReplayInlineOption) {
735 _replay_inline_data = ciReplay::load_inline_data(method(), entry_bci(), ci_env->comp_level());
736 }
737 set_print_inlining(directive->PrintInliningOption || PrintOptoInlining);
738 set_print_intrinsics(directive->PrintIntrinsicsOption);
739 set_has_irreducible_loop(true); // conservative until build_loop_tree() reset it
740
741 if (ProfileTraps) {
742 // Make sure the method being compiled gets its own MDO,
743 // so we can at least track the decompile_count().
744 method()->ensure_method_data();
745 }
746
747 if (StressLCM || StressGCM || StressIGVN || StressCCP ||
748 StressIncrementalInlining || StressMacroExpansion || StressUnstableIfTraps || StressBailout) {
749 initialize_stress_seed(directive);
750 }
751
752 Init(/*do_aliasing=*/ true);
753
754 print_compile_messages();
755
756 _ilt = InlineTree::build_inline_tree_root();
757
758 // Even if NO memory addresses are used, MergeMem nodes must have at least 1 slice
759 assert(num_alias_types() >= AliasIdxRaw, "");
760
761 #define MINIMUM_NODE_HASH 1023
762
763 // GVN that will be run immediately on new nodes
764 uint estimated_size = method()->code_size()*4+64;
765 estimated_size = (estimated_size < MINIMUM_NODE_HASH ? MINIMUM_NODE_HASH : estimated_size);
766 _igvn_worklist = new (comp_arena()) Unique_Node_List(comp_arena());
767 _types = new (comp_arena()) Type_Array(comp_arena());
768 _node_hash = new (comp_arena()) NodeHash(comp_arena(), estimated_size);
769 PhaseGVN gvn;
770 set_initial_gvn(&gvn);
771
772 { // Scope for timing the parser
773 TracePhase tp(_t_parser);
774
775 // Put top into the hash table ASAP.
776 initial_gvn()->transform(top());
777
778 // Set up tf(), start(), and find a CallGenerator.
779 CallGenerator* cg = nullptr;
780 if (is_osr_compilation()) {
781 init_tf(TypeFunc::make(method(), /* is_osr_compilation = */ true));
782 StartNode* s = new StartOSRNode(root(), tf()->domain_sig());
783 initial_gvn()->set_type_bottom(s);
784 verify_start(s);
785 cg = CallGenerator::for_osr(method(), entry_bci());
786 } else {
787 // Normal case.
788 init_tf(TypeFunc::make(method()));
789 StartNode* s = new StartNode(root(), tf()->domain_cc());
790 initial_gvn()->set_type_bottom(s);
791 verify_start(s);
792 if (method()->intrinsic_id() == vmIntrinsics::_Reference_get) {
793 // With java.lang.ref.reference.get() we must go through the
794 // intrinsic - even when get() is the root
795 // method of the compile - so that, if necessary, the value in
796 // the referent field of the reference object gets recorded by
797 // the pre-barrier code.
798 cg = find_intrinsic(method(), false);
799 }
800 if (cg == nullptr) {
801 float past_uses = method()->interpreter_invocation_count();
802 float expected_uses = past_uses;
803 cg = CallGenerator::for_inline(method(), expected_uses);
804 }
805 }
806 if (failing()) return;
807 if (cg == nullptr) {
808 const char* reason = InlineTree::check_can_parse(method());
809 assert(reason != nullptr, "expect reason for parse failure");
810 stringStream ss;
811 ss.print("cannot parse method: %s", reason);
812 record_method_not_compilable(ss.as_string());
813 return;
814 }
815
816 gvn.set_type(root(), root()->bottom_type());
817
818 JVMState* jvms = build_start_state(start(), tf());
819 if ((jvms = cg->generate(jvms)) == nullptr) {
820 assert(failure_reason() != nullptr, "expect reason for parse failure");
821 stringStream ss;
822 ss.print("method parse failed: %s", failure_reason());
823 record_method_not_compilable(ss.as_string() DEBUG_ONLY(COMMA true));
824 return;
825 }
826 GraphKit kit(jvms);
827
828 if (!kit.stopped()) {
829 // Accept return values, and transfer control we know not where.
830 // This is done by a special, unique ReturnNode bound to root.
831 return_values(kit.jvms());
832 }
833
834 if (kit.has_exceptions()) {
835 // Any exceptions that escape from this call must be rethrown
836 // to whatever caller is dynamically above us on the stack.
837 // This is done by a special, unique RethrowNode bound to root.
838 rethrow_exceptions(kit.transfer_exceptions_into_jvms());
839 }
840
841 assert(IncrementalInline || (_late_inlines.length() == 0 && !has_mh_late_inlines()), "incremental inlining is off");
842
843 if (_late_inlines.length() == 0 && !has_mh_late_inlines() && !failing() && has_stringbuilder()) {
844 inline_string_calls(true);
845 }
846
847 if (failing()) return;
848
849 // Remove clutter produced by parsing.
850 if (!failing()) {
851 ResourceMark rm;
852 PhaseRemoveUseless pru(initial_gvn(), *igvn_worklist());
853 }
854 }
855
856 // Note: Large methods are capped off in do_one_bytecode().
857 if (failing()) return;
858
859 // After parsing, node notes are no longer automagic.
860 // They must be propagated by register_new_node_with_optimizer(),
861 // clone(), or the like.
862 set_default_node_notes(nullptr);
863
864 #ifndef PRODUCT
865 if (should_print_igv(1)) {
866 _igv_printer->print_inlining();
867 }
868 #endif
869
870 if (failing()) return;
871 NOT_PRODUCT( verify_graph_edges(); )
872
873 // Now optimize
874 Optimize();
875 if (failing()) return;
876 NOT_PRODUCT( verify_graph_edges(); )
877
878 #ifndef PRODUCT
879 if (should_print_ideal()) {
880 print_ideal_ir("print_ideal");
881 }
882 #endif
883
884 #ifdef ASSERT
885 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
886 bs->verify_gc_barriers(this, BarrierSetC2::BeforeCodeGen);
887 #endif
888
889 // Dump compilation data to replay it.
890 if (directive->DumpReplayOption) {
891 env()->dump_replay_data(_compile_id);
892 }
893 if (directive->DumpInlineOption && (ilt() != nullptr)) {
894 env()->dump_inline_data(_compile_id);
895 }
896
897 // Now that we know the size of all the monitors we can add a fixed slot
898 // for the original deopt pc.
899 int next_slot = fixed_slots() + (sizeof(address) / VMRegImpl::stack_slot_size);
900 if (needs_stack_repair()) {
901 // One extra slot for the special stack increment value
902 next_slot += 2;
903 }
904 // TODO 8284443 Only reserve extra slot if needed
905 if (InlineTypeReturnedAsFields) {
906 // One extra slot to hold the null marker for a nullable
907 // inline type return if we run out of registers.
908 next_slot += 2;
909 }
910 set_fixed_slots(next_slot);
911
912 // Compute when to use implicit null checks. Used by matching trap based
913 // nodes and NullCheck optimization.
914 set_allowed_deopt_reasons();
915
916 // Now generate code
917 Code_Gen();
918 }
919
920 //------------------------------Compile----------------------------------------
921 // Compile a runtime stub
922 Compile::Compile(ciEnv* ci_env,
923 TypeFunc_generator generator,
924 address stub_function,
925 const char *stub_name,
926 int is_fancy_jump,
927 bool pass_tls,
928 bool return_pc,
929 DirectiveSet* directive)
930 : Phase(Compiler),
931 _compile_id(0),
932 _options(Options::for_runtime_stub()),
933 _method(nullptr),
934 _entry_bci(InvocationEntryBci),
935 _stub_function(stub_function),
936 _stub_name(stub_name),
937 _stub_entry_point(nullptr),
938 _max_node_limit(MaxNodeLimit),
939 _post_loop_opts_phase(false),
940 _merge_stores_phase(false),
941 _allow_macro_nodes(true),
942 _inlining_progress(false),
943 _inlining_incrementally(false),
944 _has_reserved_stack_access(false),
945 _has_circular_inline_type(false),
946 #ifndef PRODUCT
947 _igv_idx(0),
948 _trace_opto_output(directive->TraceOptoOutputOption),
949 #endif
950 _has_method_handle_invokes(false),
951 _clinit_barrier_on_entry(false),
952 _stress_seed(0),
953 _comp_arena(mtCompiler, Arena::Tag::tag_comp),
954 _barrier_set_state(BarrierSet::barrier_set()->barrier_set_c2()->create_barrier_state(comp_arena())),
955 _env(ci_env),
956 _directive(directive),
957 _log(ci_env->log()),
958 _first_failure_details(nullptr),
959 _for_post_loop_igvn(comp_arena(), 8, 0, nullptr),
960 _for_merge_stores_igvn(comp_arena(), 8, 0, nullptr),
961 _congraph(nullptr),
962 NOT_PRODUCT(_igv_printer(nullptr) COMMA)
963 _unique(0),
964 _dead_node_count(0),
965 _dead_node_list(comp_arena()),
966 _node_arena_one(mtCompiler, Arena::Tag::tag_node),
967 _node_arena_two(mtCompiler, Arena::Tag::tag_node),
968 _node_arena(&_node_arena_one),
969 _mach_constant_base_node(nullptr),
970 _Compile_types(mtCompiler, Arena::Tag::tag_type),
971 _initial_gvn(nullptr),
972 _igvn_worklist(nullptr),
973 _types(nullptr),
974 _node_hash(nullptr),
975 _number_of_mh_late_inlines(0),
976 _oom(false),
977 _replay_inline_data(nullptr),
978 _inline_printer(this),
979 _java_calls(0),
980 _inner_loops(0),
981 _interpreter_frame_size(0),
982 _output(nullptr),
983 #ifndef PRODUCT
984 _in_dump_cnt(0),
985 #endif
986 _allowed_reasons(0) {
987 C = this;
988
989 TraceTime t1(nullptr, &_t_totalCompilation, CITime, false);
990 TraceTime t2(nullptr, &_t_stubCompilation, CITime, false);
991
992 #ifndef PRODUCT
993 set_print_assembly(PrintFrameConverterAssembly);
994 set_parsed_irreducible_loop(false);
995 #else
996 set_print_assembly(false); // Must initialize.
997 #endif
998 set_has_irreducible_loop(false); // no loops
999
1000 CompileWrapper cw(this);
1001 Init(/*do_aliasing=*/ false);
1002 init_tf((*generator)());
1003
1004 _igvn_worklist = new (comp_arena()) Unique_Node_List(comp_arena());
1005 _types = new (comp_arena()) Type_Array(comp_arena());
1006 _node_hash = new (comp_arena()) NodeHash(comp_arena(), 255);
1007
1008 if (StressLCM || StressGCM || StressBailout) {
1009 initialize_stress_seed(directive);
1010 }
1011
1012 {
1013 PhaseGVN gvn;
1014 set_initial_gvn(&gvn); // not significant, but GraphKit guys use it pervasively
1015 gvn.transform(top());
1016
1017 GraphKit kit;
1018 kit.gen_stub(stub_function, stub_name, is_fancy_jump, pass_tls, return_pc);
1019 }
1020
1021 NOT_PRODUCT( verify_graph_edges(); )
1022
1023 Code_Gen();
1024 }
1025
1026 Compile::~Compile() {
1027 delete _first_failure_details;
1028 };
1029
1030 //------------------------------Init-------------------------------------------
1031 // Prepare for a single compilation
1032 void Compile::Init(bool aliasing) {
1033 _do_aliasing = aliasing;
1034 _unique = 0;
1035 _regalloc = nullptr;
1036
1037 _tf = nullptr; // filled in later
1038 _top = nullptr; // cached later
1039 _matcher = nullptr; // filled in later
1040 _cfg = nullptr; // filled in later
1041
1042 _node_note_array = nullptr;
1043 _default_node_notes = nullptr;
1044 DEBUG_ONLY( _modified_nodes = nullptr; ) // Used in Optimize()
1045
1046 _immutable_memory = nullptr; // filled in at first inquiry
1047
1048 #ifdef ASSERT
1049 _phase_optimize_finished = false;
1050 _phase_verify_ideal_loop = false;
1051 _exception_backedge = false;
1052 _type_verify = nullptr;
1053 #endif
1054
1055 // Globally visible Nodes
1056 // First set TOP to null to give safe behavior during creation of RootNode
1057 set_cached_top_node(nullptr);
1058 set_root(new RootNode());
1059 // Now that you have a Root to point to, create the real TOP
1060 set_cached_top_node( new ConNode(Type::TOP) );
1061 set_recent_alloc(nullptr, nullptr);
1062
1063 // Create Debug Information Recorder to record scopes, oopmaps, etc.
1064 env()->set_oop_recorder(new OopRecorder(env()->arena()));
1065 env()->set_debug_info(new DebugInformationRecorder(env()->oop_recorder()));
1066 env()->set_dependencies(new Dependencies(env()));
1067
1068 _fixed_slots = 0;
1069 set_has_split_ifs(false);
1070 set_has_loops(false); // first approximation
1071 set_has_stringbuilder(false);
1072 set_has_boxed_value(false);
1073 _trap_can_recompile = false; // no traps emitted yet
1074 _major_progress = true; // start out assuming good things will happen
1075 set_has_unsafe_access(false);
1076 set_max_vector_size(0);
1077 set_clear_upper_avx(false); //false as default for clear upper bits of ymm registers
1078 Copy::zero_to_bytes(_trap_hist, sizeof(_trap_hist));
1079 set_decompile_count(0);
1080
1081 #ifndef PRODUCT
1082 Copy::zero_to_bytes(_igv_phase_iter, sizeof(_igv_phase_iter));
1083 #endif
1084
1085 set_do_freq_based_layout(_directive->BlockLayoutByFrequencyOption);
1086 _loop_opts_cnt = LoopOptsCount;
1087 _has_flat_accesses = false;
1088 _flat_accesses_share_alias = true;
1089 _scalarize_in_safepoints = false;
1090
1091 set_do_inlining(Inline);
1092 set_max_inline_size(MaxInlineSize);
1093 set_freq_inline_size(FreqInlineSize);
1094 set_do_scheduling(OptoScheduling);
1095
1096 set_do_vector_loop(false);
1097 set_has_monitors(false);
1098 set_has_scoped_access(false);
1099
1100 if (AllowVectorizeOnDemand) {
1101 if (has_method() && _directive->VectorizeOption) {
1102 set_do_vector_loop(true);
1103 NOT_PRODUCT(if (do_vector_loop() && Verbose) {tty->print("Compile::Init: do vectorized loops (SIMD like) for method %s\n", method()->name()->as_quoted_ascii());})
1104 } else if (has_method() && method()->name() != nullptr &&
1105 method()->intrinsic_id() == vmIntrinsics::_forEachRemaining) {
1106 set_do_vector_loop(true);
1107 }
1108 }
1109 set_use_cmove(UseCMoveUnconditionally /* || do_vector_loop()*/); //TODO: consider do_vector_loop() mandate use_cmove unconditionally
1110 NOT_PRODUCT(if (use_cmove() && Verbose && has_method()) {tty->print("Compile::Init: use CMove without profitability tests for method %s\n", method()->name()->as_quoted_ascii());})
1111
1112 _max_node_limit = _directive->MaxNodeLimitOption;
1113
1114 if (VM_Version::supports_fast_class_init_checks() && has_method() && !is_osr_compilation() && method()->needs_clinit_barrier()) {
1115 set_clinit_barrier_on_entry(true);
1116 }
1117 if (debug_info()->recording_non_safepoints()) {
1118 set_node_note_array(new(comp_arena()) GrowableArray<Node_Notes*>
1119 (comp_arena(), 8, 0, nullptr));
1120 set_default_node_notes(Node_Notes::make(this));
1121 }
1122
1123 const int grow_ats = 16;
1124 _max_alias_types = grow_ats;
1125 _alias_types = NEW_ARENA_ARRAY(comp_arena(), AliasType*, grow_ats);
1126 AliasType* ats = NEW_ARENA_ARRAY(comp_arena(), AliasType, grow_ats);
1127 Copy::zero_to_bytes(ats, sizeof(AliasType)*grow_ats);
1128 {
1129 for (int i = 0; i < grow_ats; i++) _alias_types[i] = &ats[i];
1130 }
1131 // Initialize the first few types.
1132 _alias_types[AliasIdxTop]->Init(AliasIdxTop, nullptr);
1133 _alias_types[AliasIdxBot]->Init(AliasIdxBot, TypePtr::BOTTOM);
1134 _alias_types[AliasIdxRaw]->Init(AliasIdxRaw, TypeRawPtr::BOTTOM);
1135 _num_alias_types = AliasIdxRaw+1;
1136 // Zero out the alias type cache.
1137 Copy::zero_to_bytes(_alias_cache, sizeof(_alias_cache));
1138 // A null adr_type hits in the cache right away. Preload the right answer.
1139 probe_alias_cache(nullptr)->_index = AliasIdxTop;
1140 }
1141
1142 #ifdef ASSERT
1143 // Verify that the current StartNode is valid.
1144 void Compile::verify_start(StartNode* s) const {
1145 assert(failing_internal() || s == start(), "should be StartNode");
1146 }
1147 #endif
1148
1149 /**
1150 * Return the 'StartNode'. We must not have a pending failure, since the ideal graph
1151 * can be in an inconsistent state, i.e., we can get segmentation faults when traversing
1152 * the ideal graph.
1153 */
1154 StartNode* Compile::start() const {
1155 assert (!failing_internal() || C->failure_is_artificial(), "Must not have pending failure. Reason is: %s", failure_reason());
1156 for (DUIterator_Fast imax, i = root()->fast_outs(imax); i < imax; i++) {
1157 Node* start = root()->fast_out(i);
1158 if (start->is_Start()) {
1159 return start->as_Start();
1160 }
1161 }
1162 fatal("Did not find Start node!");
1163 return nullptr;
1164 }
1165
1166 //-------------------------------immutable_memory-------------------------------------
1167 // Access immutable memory
1168 Node* Compile::immutable_memory() {
1169 if (_immutable_memory != nullptr) {
1170 return _immutable_memory;
1171 }
1172 StartNode* s = start();
1173 for (DUIterator_Fast imax, i = s->fast_outs(imax); true; i++) {
1174 Node *p = s->fast_out(i);
1175 if (p != s && p->as_Proj()->_con == TypeFunc::Memory) {
1176 _immutable_memory = p;
1177 return _immutable_memory;
1178 }
1179 }
1180 ShouldNotReachHere();
1181 return nullptr;
1182 }
1183
1184 //----------------------set_cached_top_node------------------------------------
1185 // Install the cached top node, and make sure Node::is_top works correctly.
1186 void Compile::set_cached_top_node(Node* tn) {
1187 if (tn != nullptr) verify_top(tn);
1188 Node* old_top = _top;
1189 _top = tn;
1190 // Calling Node::setup_is_top allows the nodes the chance to adjust
1191 // their _out arrays.
1192 if (_top != nullptr) _top->setup_is_top();
1193 if (old_top != nullptr) old_top->setup_is_top();
1194 assert(_top == nullptr || top()->is_top(), "");
1195 }
1196
1197 #ifdef ASSERT
1198 uint Compile::count_live_nodes_by_graph_walk() {
1199 Unique_Node_List useful(comp_arena());
1200 // Get useful node list by walking the graph.
1201 identify_useful_nodes(useful);
1202 return useful.size();
1203 }
1204
1205 void Compile::print_missing_nodes() {
1206
1207 // Return if CompileLog is null and PrintIdealNodeCount is false.
1208 if ((_log == nullptr) && (! PrintIdealNodeCount)) {
1209 return;
1210 }
1211
1212 // This is an expensive function. It is executed only when the user
1213 // specifies VerifyIdealNodeCount option or otherwise knows the
1214 // additional work that needs to be done to identify reachable nodes
1215 // by walking the flow graph and find the missing ones using
1216 // _dead_node_list.
1217
1218 Unique_Node_List useful(comp_arena());
1219 // Get useful node list by walking the graph.
1220 identify_useful_nodes(useful);
1221
1222 uint l_nodes = C->live_nodes();
1223 uint l_nodes_by_walk = useful.size();
1224
1225 if (l_nodes != l_nodes_by_walk) {
1226 if (_log != nullptr) {
1227 _log->begin_head("mismatched_nodes count='%d'", abs((int) (l_nodes - l_nodes_by_walk)));
1228 _log->stamp();
1229 _log->end_head();
1230 }
1231 VectorSet& useful_member_set = useful.member_set();
1232 int last_idx = l_nodes_by_walk;
1233 for (int i = 0; i < last_idx; i++) {
1234 if (useful_member_set.test(i)) {
1235 if (_dead_node_list.test(i)) {
1236 if (_log != nullptr) {
1237 _log->elem("mismatched_node_info node_idx='%d' type='both live and dead'", i);
1238 }
1239 if (PrintIdealNodeCount) {
1240 // Print the log message to tty
1241 tty->print_cr("mismatched_node idx='%d' both live and dead'", i);
1242 useful.at(i)->dump();
1243 }
1244 }
1245 }
1246 else if (! _dead_node_list.test(i)) {
1247 if (_log != nullptr) {
1248 _log->elem("mismatched_node_info node_idx='%d' type='neither live nor dead'", i);
1249 }
1250 if (PrintIdealNodeCount) {
1251 // Print the log message to tty
1252 tty->print_cr("mismatched_node idx='%d' type='neither live nor dead'", i);
1253 }
1254 }
1255 }
1256 if (_log != nullptr) {
1257 _log->tail("mismatched_nodes");
1258 }
1259 }
1260 }
1261 void Compile::record_modified_node(Node* n) {
1262 if (_modified_nodes != nullptr && !_inlining_incrementally && !n->is_Con()) {
1263 _modified_nodes->push(n);
1264 }
1265 }
1266
1267 void Compile::remove_modified_node(Node* n) {
1268 if (_modified_nodes != nullptr) {
1269 _modified_nodes->remove(n);
1270 }
1271 }
1272 #endif
1273
1274 #ifndef PRODUCT
1275 void Compile::verify_top(Node* tn) const {
1276 if (tn != nullptr) {
1277 assert(tn->is_Con(), "top node must be a constant");
1278 assert(((ConNode*)tn)->type() == Type::TOP, "top node must have correct type");
1279 assert(tn->in(0) != nullptr, "must have live top node");
1280 }
1281 }
1282 #endif
1283
1284
1285 ///-------------------Managing Per-Node Debug & Profile Info-------------------
1286
1287 void Compile::grow_node_notes(GrowableArray<Node_Notes*>* arr, int grow_by) {
1288 guarantee(arr != nullptr, "");
1289 int num_blocks = arr->length();
1290 if (grow_by < num_blocks) grow_by = num_blocks;
1291 int num_notes = grow_by * _node_notes_block_size;
1292 Node_Notes* notes = NEW_ARENA_ARRAY(node_arena(), Node_Notes, num_notes);
1293 Copy::zero_to_bytes(notes, num_notes * sizeof(Node_Notes));
1294 while (num_notes > 0) {
1295 arr->append(notes);
1296 notes += _node_notes_block_size;
1297 num_notes -= _node_notes_block_size;
1298 }
1299 assert(num_notes == 0, "exact multiple, please");
1300 }
1301
1302 bool Compile::copy_node_notes_to(Node* dest, Node* source) {
1303 if (source == nullptr || dest == nullptr) return false;
1304
1305 if (dest->is_Con())
1306 return false; // Do not push debug info onto constants.
1307
1308 #ifdef ASSERT
1309 // Leave a bread crumb trail pointing to the original node:
1310 if (dest != nullptr && dest != source && dest->debug_orig() == nullptr) {
1311 dest->set_debug_orig(source);
1312 }
1313 #endif
1314
1315 if (node_note_array() == nullptr)
1316 return false; // Not collecting any notes now.
1317
1318 // This is a copy onto a pre-existing node, which may already have notes.
1319 // If both nodes have notes, do not overwrite any pre-existing notes.
1320 Node_Notes* source_notes = node_notes_at(source->_idx);
1321 if (source_notes == nullptr || source_notes->is_clear()) return false;
1322 Node_Notes* dest_notes = node_notes_at(dest->_idx);
1323 if (dest_notes == nullptr || dest_notes->is_clear()) {
1324 return set_node_notes_at(dest->_idx, source_notes);
1325 }
1326
1327 Node_Notes merged_notes = (*source_notes);
1328 // The order of operations here ensures that dest notes will win...
1329 merged_notes.update_from(dest_notes);
1330 return set_node_notes_at(dest->_idx, &merged_notes);
1331 }
1332
1333
1334 //--------------------------allow_range_check_smearing-------------------------
1335 // Gating condition for coalescing similar range checks.
1336 // Sometimes we try 'speculatively' replacing a series of a range checks by a
1337 // single covering check that is at least as strong as any of them.
1338 // If the optimization succeeds, the simplified (strengthened) range check
1339 // will always succeed. If it fails, we will deopt, and then give up
1340 // on the optimization.
1341 bool Compile::allow_range_check_smearing() const {
1342 // If this method has already thrown a range-check,
1343 // assume it was because we already tried range smearing
1344 // and it failed.
1345 uint already_trapped = trap_count(Deoptimization::Reason_range_check);
1346 return !already_trapped;
1347 }
1348
1349
1350 //------------------------------flatten_alias_type-----------------------------
1351 const TypePtr *Compile::flatten_alias_type( const TypePtr *tj ) const {
1352 assert(do_aliasing(), "Aliasing should be enabled");
1353 int offset = tj->offset();
1354 TypePtr::PTR ptr = tj->ptr();
1355
1356 // Known instance (scalarizable allocation) alias only with itself.
1357 bool is_known_inst = tj->isa_oopptr() != nullptr &&
1358 tj->is_oopptr()->is_known_instance();
1359
1360 // Process weird unsafe references.
1361 if (offset == Type::OffsetBot && (tj->isa_instptr() /*|| tj->isa_klassptr()*/)) {
1362 assert(InlineUnsafeOps || StressReflectiveCode, "indeterminate pointers come only from unsafe ops");
1363 assert(!is_known_inst, "scalarizable allocation should not have unsafe references");
1364 tj = TypeOopPtr::BOTTOM;
1365 ptr = tj->ptr();
1366 offset = tj->offset();
1367 }
1368
1369 // Array pointers need some flattening
1370 const TypeAryPtr* ta = tj->isa_aryptr();
1371 if (ta && ta->is_stable()) {
1372 // Erase stability property for alias analysis.
1373 tj = ta = ta->cast_to_stable(false);
1374 }
1375 if (ta && ta->is_not_flat()) {
1376 // Erase not flat property for alias analysis.
1377 tj = ta = ta->cast_to_not_flat(false);
1378 }
1379 if (ta && ta->is_not_null_free()) {
1380 // Erase not null free property for alias analysis.
1381 tj = ta = ta->cast_to_not_null_free(false);
1382 }
1383
1384 if( ta && is_known_inst ) {
1385 if ( offset != Type::OffsetBot &&
1386 offset > arrayOopDesc::length_offset_in_bytes() ) {
1387 offset = Type::OffsetBot; // Flatten constant access into array body only
1388 tj = ta = ta->
1389 remove_speculative()->
1390 cast_to_ptr_type(ptr)->
1391 with_offset(offset);
1392 }
1393 } else if (ta) {
1394 // For arrays indexed by constant indices, we flatten the alias
1395 // space to include all of the array body. Only the header, klass
1396 // and array length can be accessed un-aliased.
1397 // For flat inline type array, each field has its own slice so
1398 // we must include the field offset.
1399 if( offset != Type::OffsetBot ) {
1400 if( ta->const_oop() ) { // MethodData* or Method*
1401 offset = Type::OffsetBot; // Flatten constant access into array body
1402 tj = ta = ta->
1403 remove_speculative()->
1404 cast_to_ptr_type(ptr)->
1405 cast_to_exactness(false)->
1406 with_offset(offset);
1407 } else if( offset == arrayOopDesc::length_offset_in_bytes() ) {
1408 // range is OK as-is.
1409 tj = ta = TypeAryPtr::RANGE;
1410 } else if( offset == oopDesc::klass_offset_in_bytes() ) {
1411 tj = TypeInstPtr::KLASS; // all klass loads look alike
1412 ta = TypeAryPtr::RANGE; // generic ignored junk
1413 ptr = TypePtr::BotPTR;
1414 } else if( offset == oopDesc::mark_offset_in_bytes() ) {
1415 tj = TypeInstPtr::MARK;
1416 ta = TypeAryPtr::RANGE; // generic ignored junk
1417 ptr = TypePtr::BotPTR;
1418 } else { // Random constant offset into array body
1419 offset = Type::OffsetBot; // Flatten constant access into array body
1420 tj = ta = ta->
1421 remove_speculative()->
1422 cast_to_ptr_type(ptr)->
1423 cast_to_exactness(false)->
1424 with_offset(offset);
1425 }
1426 }
1427 // Arrays of fixed size alias with arrays of unknown size.
1428 if (ta->size() != TypeInt::POS) {
1429 const TypeAry *tary = TypeAry::make(ta->elem(), TypeInt::POS);
1430 tj = ta = ta->
1431 remove_speculative()->
1432 cast_to_ptr_type(ptr)->
1433 with_ary(tary)->
1434 cast_to_exactness(false);
1435 }
1436 // Arrays of known objects become arrays of unknown objects.
1437 if (ta->elem()->isa_narrowoop() && ta->elem() != TypeNarrowOop::BOTTOM) {
1438 const TypeAry *tary = TypeAry::make(TypeNarrowOop::BOTTOM, ta->size());
1439 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,nullptr,false,Type::Offset(offset), ta->field_offset());
1440 }
1441 if (ta->elem()->isa_oopptr() && ta->elem() != TypeInstPtr::BOTTOM) {
1442 const TypeAry *tary = TypeAry::make(TypeInstPtr::BOTTOM, ta->size());
1443 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,nullptr,false,Type::Offset(offset), ta->field_offset());
1444 }
1445 // Initially all flattened array accesses share a single slice
1446 if (ta->is_flat() && ta->elem() != TypeInstPtr::BOTTOM && _flat_accesses_share_alias) {
1447 const TypeAry* tary = TypeAry::make(TypeInstPtr::BOTTOM, ta->size(), /* stable= */ false, /* flat= */ true);
1448 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,nullptr,false,Type::Offset(offset), Type::Offset(Type::OffsetBot));
1449 }
1450 // Arrays of bytes and of booleans both use 'bastore' and 'baload' so
1451 // cannot be distinguished by bytecode alone.
1452 if (ta->elem() == TypeInt::BOOL) {
1453 const TypeAry *tary = TypeAry::make(TypeInt::BYTE, ta->size());
1454 ciKlass* aklass = ciTypeArrayKlass::make(T_BYTE);
1455 tj = ta = TypeAryPtr::make(ptr,ta->const_oop(),tary,aklass,false,Type::Offset(offset), ta->field_offset());
1456 }
1457 // During the 2nd round of IterGVN, NotNull castings are removed.
1458 // Make sure the Bottom and NotNull variants alias the same.
1459 // Also, make sure exact and non-exact variants alias the same.
1460 if (ptr == TypePtr::NotNull || ta->klass_is_exact() || ta->speculative() != nullptr) {
1461 tj = ta = ta->
1462 remove_speculative()->
1463 cast_to_ptr_type(TypePtr::BotPTR)->
1464 cast_to_exactness(false)->
1465 with_offset(offset);
1466 }
1467 }
1468
1469 // Oop pointers need some flattening
1470 const TypeInstPtr *to = tj->isa_instptr();
1471 if (to && to != TypeOopPtr::BOTTOM) {
1472 ciInstanceKlass* ik = to->instance_klass();
1473 if( ptr == TypePtr::Constant ) {
1474 if (ik != ciEnv::current()->Class_klass() ||
1475 offset < ik->layout_helper_size_in_bytes()) {
1476 // No constant oop pointers (such as Strings); they alias with
1477 // unknown strings.
1478 assert(!is_known_inst, "not scalarizable allocation");
1479 tj = to = to->
1480 cast_to_instance_id(TypeOopPtr::InstanceBot)->
1481 remove_speculative()->
1482 cast_to_ptr_type(TypePtr::BotPTR)->
1483 cast_to_exactness(false);
1484 }
1485 } else if( is_known_inst ) {
1486 tj = to; // Keep NotNull and klass_is_exact for instance type
1487 } else if( ptr == TypePtr::NotNull || to->klass_is_exact() ) {
1488 // During the 2nd round of IterGVN, NotNull castings are removed.
1489 // Make sure the Bottom and NotNull variants alias the same.
1490 // Also, make sure exact and non-exact variants alias the same.
1491 tj = to = to->
1492 remove_speculative()->
1493 cast_to_instance_id(TypeOopPtr::InstanceBot)->
1494 cast_to_ptr_type(TypePtr::BotPTR)->
1495 cast_to_exactness(false);
1496 }
1497 if (to->speculative() != nullptr) {
1498 tj = to = to->remove_speculative();
1499 }
1500 // Canonicalize the holder of this field
1501 if (offset >= 0 && offset < instanceOopDesc::base_offset_in_bytes()) {
1502 // First handle header references such as a LoadKlassNode, even if the
1503 // object's klass is unloaded at compile time (4965979).
1504 if (!is_known_inst) { // Do it only for non-instance types
1505 tj = to = TypeInstPtr::make(TypePtr::BotPTR, env()->Object_klass(), false, nullptr, Type::Offset(offset));
1506 }
1507 } else if (offset < 0 || offset >= ik->layout_helper_size_in_bytes()) {
1508 // Static fields are in the space above the normal instance
1509 // fields in the java.lang.Class instance.
1510 if (ik != ciEnv::current()->Class_klass()) {
1511 to = nullptr;
1512 tj = TypeOopPtr::BOTTOM;
1513 offset = tj->offset();
1514 }
1515 } else {
1516 ciInstanceKlass *canonical_holder = ik->get_canonical_holder(offset);
1517 assert(offset < canonical_holder->layout_helper_size_in_bytes(), "");
1518 assert(tj->offset() == offset, "no change to offset expected");
1519 bool xk = to->klass_is_exact();
1520 int instance_id = to->instance_id();
1521
1522 // If the input type's class is the holder: if exact, the type only includes interfaces implemented by the holder
1523 // but if not exact, it may include extra interfaces: build new type from the holder class to make sure only
1524 // its interfaces are included.
1525 if (xk && ik->equals(canonical_holder)) {
1526 assert(tj == TypeInstPtr::make(to->ptr(), canonical_holder, is_known_inst, nullptr, Type::Offset(offset), instance_id), "exact type should be canonical type");
1527 } else {
1528 assert(xk || !is_known_inst, "Known instance should be exact type");
1529 tj = to = TypeInstPtr::make(to->ptr(), canonical_holder, is_known_inst, nullptr, Type::Offset(offset), instance_id);
1530 }
1531 }
1532 }
1533
1534 // Klass pointers to object array klasses need some flattening
1535 const TypeKlassPtr *tk = tj->isa_klassptr();
1536 if( tk ) {
1537 // If we are referencing a field within a Klass, we need
1538 // to assume the worst case of an Object. Both exact and
1539 // inexact types must flatten to the same alias class so
1540 // use NotNull as the PTR.
1541 if ( offset == Type::OffsetBot || (offset >= 0 && (size_t)offset < sizeof(Klass)) ) {
1542 tj = tk = TypeInstKlassPtr::make(TypePtr::NotNull,
1543 env()->Object_klass(),
1544 Type::Offset(offset));
1545 }
1546
1547 if (tk->isa_aryklassptr() && tk->is_aryklassptr()->elem()->isa_klassptr()) {
1548 ciKlass* k = ciObjArrayKlass::make(env()->Object_klass());
1549 if (!k || !k->is_loaded()) { // Only fails for some -Xcomp runs
1550 tj = tk = TypeInstKlassPtr::make(TypePtr::NotNull, env()->Object_klass(), Type::Offset(offset));
1551 } else {
1552 tj = tk = TypeAryKlassPtr::make(TypePtr::NotNull, tk->is_aryklassptr()->elem(), k, Type::Offset(offset), tk->is_not_flat(), tk->is_not_null_free(), tk->is_flat(), tk->is_null_free());
1553 }
1554 }
1555 // Check for precise loads from the primary supertype array and force them
1556 // to the supertype cache alias index. Check for generic array loads from
1557 // the primary supertype array and also force them to the supertype cache
1558 // alias index. Since the same load can reach both, we need to merge
1559 // these 2 disparate memories into the same alias class. Since the
1560 // primary supertype array is read-only, there's no chance of confusion
1561 // where we bypass an array load and an array store.
1562 int primary_supers_offset = in_bytes(Klass::primary_supers_offset());
1563 if (offset == Type::OffsetBot ||
1564 (offset >= primary_supers_offset &&
1565 offset < (int)(primary_supers_offset + Klass::primary_super_limit() * wordSize)) ||
1566 offset == (int)in_bytes(Klass::secondary_super_cache_offset())) {
1567 offset = in_bytes(Klass::secondary_super_cache_offset());
1568 tj = tk = tk->with_offset(offset);
1569 }
1570 }
1571
1572 // Flatten all Raw pointers together.
1573 if (tj->base() == Type::RawPtr)
1574 tj = TypeRawPtr::BOTTOM;
1575
1576 if (tj->base() == Type::AnyPtr)
1577 tj = TypePtr::BOTTOM; // An error, which the caller must check for.
1578
1579 offset = tj->offset();
1580 assert( offset != Type::OffsetTop, "Offset has fallen from constant" );
1581
1582 assert( (offset != Type::OffsetBot && tj->base() != Type::AryPtr) ||
1583 (offset == Type::OffsetBot && tj->base() == Type::AryPtr) ||
1584 (offset == Type::OffsetBot && tj == TypeOopPtr::BOTTOM) ||
1585 (offset == Type::OffsetBot && tj == TypePtr::BOTTOM) ||
1586 (offset == oopDesc::mark_offset_in_bytes() && tj->base() == Type::AryPtr) ||
1587 (offset == oopDesc::klass_offset_in_bytes() && tj->base() == Type::AryPtr) ||
1588 (offset == arrayOopDesc::length_offset_in_bytes() && tj->base() == Type::AryPtr),
1589 "For oops, klasses, raw offset must be constant; for arrays the offset is never known" );
1590 assert( tj->ptr() != TypePtr::TopPTR &&
1591 tj->ptr() != TypePtr::AnyNull &&
1592 tj->ptr() != TypePtr::Null, "No imprecise addresses" );
1593 // assert( tj->ptr() != TypePtr::Constant ||
1594 // tj->base() == Type::RawPtr ||
1595 // tj->base() == Type::KlassPtr, "No constant oop addresses" );
1596
1597 return tj;
1598 }
1599
1600 void Compile::AliasType::Init(int i, const TypePtr* at) {
1601 assert(AliasIdxTop <= i && i < Compile::current()->_max_alias_types, "Invalid alias index");
1602 _index = i;
1603 _adr_type = at;
1604 _field = nullptr;
1605 _element = nullptr;
1606 _is_rewritable = true; // default
1607 const TypeOopPtr *atoop = (at != nullptr) ? at->isa_oopptr() : nullptr;
1608 if (atoop != nullptr && atoop->is_known_instance()) {
1609 const TypeOopPtr *gt = atoop->cast_to_instance_id(TypeOopPtr::InstanceBot);
1610 _general_index = Compile::current()->get_alias_index(gt);
1611 } else {
1612 _general_index = 0;
1613 }
1614 }
1615
1616 BasicType Compile::AliasType::basic_type() const {
1617 if (element() != nullptr) {
1618 const Type* element = adr_type()->is_aryptr()->elem();
1619 return element->isa_narrowoop() ? T_OBJECT : element->array_element_basic_type();
1620 } if (field() != nullptr) {
1621 return field()->layout_type();
1622 } else {
1623 return T_ILLEGAL; // unknown
1624 }
1625 }
1626
1627 //---------------------------------print_on------------------------------------
1628 #ifndef PRODUCT
1629 void Compile::AliasType::print_on(outputStream* st) {
1630 if (index() < 10)
1631 st->print("@ <%d> ", index());
1632 else st->print("@ <%d>", index());
1633 st->print(is_rewritable() ? " " : " RO");
1634 int offset = adr_type()->offset();
1635 if (offset == Type::OffsetBot)
1636 st->print(" +any");
1637 else st->print(" +%-3d", offset);
1638 st->print(" in ");
1639 adr_type()->dump_on(st);
1640 const TypeOopPtr* tjp = adr_type()->isa_oopptr();
1641 if (field() != nullptr && tjp) {
1642 if (tjp->is_instptr()->instance_klass() != field()->holder() ||
1643 tjp->offset() != field()->offset_in_bytes()) {
1644 st->print(" != ");
1645 field()->print();
1646 st->print(" ***");
1647 }
1648 }
1649 }
1650
1651 void print_alias_types() {
1652 Compile* C = Compile::current();
1653 tty->print_cr("--- Alias types, AliasIdxBot .. %d", C->num_alias_types()-1);
1654 for (int idx = Compile::AliasIdxBot; idx < C->num_alias_types(); idx++) {
1655 C->alias_type(idx)->print_on(tty);
1656 tty->cr();
1657 }
1658 }
1659 #endif
1660
1661
1662 //----------------------------probe_alias_cache--------------------------------
1663 Compile::AliasCacheEntry* Compile::probe_alias_cache(const TypePtr* adr_type) {
1664 intptr_t key = (intptr_t) adr_type;
1665 key ^= key >> logAliasCacheSize;
1666 return &_alias_cache[key & right_n_bits(logAliasCacheSize)];
1667 }
1668
1669
1670 //-----------------------------grow_alias_types--------------------------------
1671 void Compile::grow_alias_types() {
1672 const int old_ats = _max_alias_types; // how many before?
1673 const int new_ats = old_ats; // how many more?
1674 const int grow_ats = old_ats+new_ats; // how many now?
1675 _max_alias_types = grow_ats;
1676 _alias_types = REALLOC_ARENA_ARRAY(comp_arena(), AliasType*, _alias_types, old_ats, grow_ats);
1677 AliasType* ats = NEW_ARENA_ARRAY(comp_arena(), AliasType, new_ats);
1678 Copy::zero_to_bytes(ats, sizeof(AliasType)*new_ats);
1679 for (int i = 0; i < new_ats; i++) _alias_types[old_ats+i] = &ats[i];
1680 }
1681
1682
1683 //--------------------------------find_alias_type------------------------------
1684 Compile::AliasType* Compile::find_alias_type(const TypePtr* adr_type, bool no_create, ciField* original_field, bool uncached) {
1685 if (!do_aliasing()) {
1686 return alias_type(AliasIdxBot);
1687 }
1688
1689 AliasCacheEntry* ace = nullptr;
1690 if (!uncached) {
1691 ace = probe_alias_cache(adr_type);
1692 if (ace->_adr_type == adr_type) {
1693 return alias_type(ace->_index);
1694 }
1695 }
1696
1697 // Handle special cases.
1698 if (adr_type == nullptr) return alias_type(AliasIdxTop);
1699 if (adr_type == TypePtr::BOTTOM) return alias_type(AliasIdxBot);
1700
1701 // Do it the slow way.
1702 const TypePtr* flat = flatten_alias_type(adr_type);
1703
1704 #ifdef ASSERT
1705 {
1706 ResourceMark rm;
1707 assert(flat == flatten_alias_type(flat), "not idempotent: adr_type = %s; flat = %s => %s",
1708 Type::str(adr_type), Type::str(flat), Type::str(flatten_alias_type(flat)));
1709 assert(flat != TypePtr::BOTTOM, "cannot alias-analyze an untyped ptr: adr_type = %s",
1710 Type::str(adr_type));
1711 if (flat->isa_oopptr() && !flat->isa_klassptr()) {
1712 const TypeOopPtr* foop = flat->is_oopptr();
1713 // Scalarizable allocations have exact klass always.
1714 bool exact = !foop->klass_is_exact() || foop->is_known_instance();
1715 const TypePtr* xoop = foop->cast_to_exactness(exact)->is_ptr();
1716 assert(foop == flatten_alias_type(xoop), "exactness must not affect alias type: foop = %s; xoop = %s",
1717 Type::str(foop), Type::str(xoop));
1718 }
1719 }
1720 #endif
1721
1722 int idx = AliasIdxTop;
1723 for (int i = 0; i < num_alias_types(); i++) {
1724 if (alias_type(i)->adr_type() == flat) {
1725 idx = i;
1726 break;
1727 }
1728 }
1729
1730 if (idx == AliasIdxTop) {
1731 if (no_create) return nullptr;
1732 // Grow the array if necessary.
1733 if (_num_alias_types == _max_alias_types) grow_alias_types();
1734 // Add a new alias type.
1735 idx = _num_alias_types++;
1736 _alias_types[idx]->Init(idx, flat);
1737 if (flat == TypeInstPtr::KLASS) alias_type(idx)->set_rewritable(false);
1738 if (flat == TypeAryPtr::RANGE) alias_type(idx)->set_rewritable(false);
1739 if (flat->isa_instptr()) {
1740 if (flat->offset() == java_lang_Class::klass_offset()
1741 && flat->is_instptr()->instance_klass() == env()->Class_klass())
1742 alias_type(idx)->set_rewritable(false);
1743 }
1744 ciField* field = nullptr;
1745 if (flat->isa_aryptr()) {
1746 #ifdef ASSERT
1747 const int header_size_min = arrayOopDesc::base_offset_in_bytes(T_BYTE);
1748 // (T_BYTE has the weakest alignment and size restrictions...)
1749 assert(flat->offset() < header_size_min, "array body reference must be OffsetBot");
1750 #endif
1751 const Type* elemtype = flat->is_aryptr()->elem();
1752 if (flat->offset() == TypePtr::OffsetBot) {
1753 alias_type(idx)->set_element(elemtype);
1754 }
1755 int field_offset = flat->is_aryptr()->field_offset().get();
1756 if (flat->is_flat() &&
1757 field_offset != Type::OffsetBot) {
1758 ciInlineKlass* vk = elemtype->inline_klass();
1759 field_offset += vk->payload_offset();
1760 field = vk->get_field_by_offset(field_offset, false);
1761 }
1762 }
1763 if (flat->isa_klassptr()) {
1764 if (UseCompactObjectHeaders) {
1765 if (flat->offset() == in_bytes(Klass::prototype_header_offset()))
1766 alias_type(idx)->set_rewritable(false);
1767 }
1768 if (flat->offset() == in_bytes(Klass::super_check_offset_offset()))
1769 alias_type(idx)->set_rewritable(false);
1770 if (flat->offset() == in_bytes(Klass::access_flags_offset()))
1771 alias_type(idx)->set_rewritable(false);
1772 if (flat->offset() == in_bytes(Klass::misc_flags_offset()))
1773 alias_type(idx)->set_rewritable(false);
1774 if (flat->offset() == in_bytes(Klass::java_mirror_offset()))
1775 alias_type(idx)->set_rewritable(false);
1776 if (flat->offset() == in_bytes(Klass::layout_helper_offset()))
1777 alias_type(idx)->set_rewritable(false);
1778 if (flat->offset() == in_bytes(Klass::secondary_super_cache_offset()))
1779 alias_type(idx)->set_rewritable(false);
1780 }
1781 // %%% (We would like to finalize JavaThread::threadObj_offset(),
1782 // but the base pointer type is not distinctive enough to identify
1783 // references into JavaThread.)
1784
1785 // Check for final fields.
1786 const TypeInstPtr* tinst = flat->isa_instptr();
1787 if (tinst && tinst->offset() >= instanceOopDesc::base_offset_in_bytes()) {
1788 if (tinst->const_oop() != nullptr &&
1789 tinst->instance_klass() == ciEnv::current()->Class_klass() &&
1790 tinst->offset() >= (tinst->instance_klass()->layout_helper_size_in_bytes())) {
1791 // static field
1792 ciInstanceKlass* k = tinst->const_oop()->as_instance()->java_lang_Class_klass()->as_instance_klass();
1793 field = k->get_field_by_offset(tinst->offset(), true);
1794 } else if (tinst->is_inlinetypeptr()) {
1795 // Inline type field
1796 ciInlineKlass* vk = tinst->inline_klass();
1797 field = vk->get_field_by_offset(tinst->offset(), false);
1798 } else {
1799 ciInstanceKlass *k = tinst->instance_klass();
1800 field = k->get_field_by_offset(tinst->offset(), false);
1801 }
1802 }
1803 assert(field == nullptr ||
1804 original_field == nullptr ||
1805 (field->holder() == original_field->holder() &&
1806 field->offset_in_bytes() == original_field->offset_in_bytes() &&
1807 field->is_static() == original_field->is_static()), "wrong field?");
1808 // Set field() and is_rewritable() attributes.
1809 if (field != nullptr) {
1810 alias_type(idx)->set_field(field);
1811 if (flat->isa_aryptr()) {
1812 // Fields of flat arrays are rewritable although they are declared final
1813 assert(flat->is_flat(), "must be a flat array");
1814 alias_type(idx)->set_rewritable(true);
1815 }
1816 }
1817 }
1818
1819 // Fill the cache for next time.
1820 if (!uncached) {
1821 ace->_adr_type = adr_type;
1822 ace->_index = idx;
1823 assert(alias_type(adr_type) == alias_type(idx), "type must be installed");
1824
1825 // Might as well try to fill the cache for the flattened version, too.
1826 AliasCacheEntry* face = probe_alias_cache(flat);
1827 if (face->_adr_type == nullptr) {
1828 face->_adr_type = flat;
1829 face->_index = idx;
1830 assert(alias_type(flat) == alias_type(idx), "flat type must work too");
1831 }
1832 }
1833
1834 return alias_type(idx);
1835 }
1836
1837
1838 Compile::AliasType* Compile::alias_type(ciField* field) {
1839 const TypeOopPtr* t;
1840 if (field->is_static())
1841 t = TypeInstPtr::make(field->holder()->java_mirror());
1842 else
1843 t = TypeOopPtr::make_from_klass_raw(field->holder());
1844 AliasType* atp = alias_type(t->add_offset(field->offset_in_bytes()), field);
1845 assert((field->is_final() || field->is_stable()) == !atp->is_rewritable(), "must get the rewritable bits correct");
1846 return atp;
1847 }
1848
1849
1850 //------------------------------have_alias_type--------------------------------
1851 bool Compile::have_alias_type(const TypePtr* adr_type) {
1852 AliasCacheEntry* ace = probe_alias_cache(adr_type);
1853 if (ace->_adr_type == adr_type) {
1854 return true;
1855 }
1856
1857 // Handle special cases.
1858 if (adr_type == nullptr) return true;
1859 if (adr_type == TypePtr::BOTTOM) return true;
1860
1861 return find_alias_type(adr_type, true, nullptr) != nullptr;
1862 }
1863
1864 //-----------------------------must_alias--------------------------------------
1865 // True if all values of the given address type are in the given alias category.
1866 bool Compile::must_alias(const TypePtr* adr_type, int alias_idx) {
1867 if (alias_idx == AliasIdxBot) return true; // the universal category
1868 if (adr_type == nullptr) return true; // null serves as TypePtr::TOP
1869 if (alias_idx == AliasIdxTop) return false; // the empty category
1870 if (adr_type->base() == Type::AnyPtr) return false; // TypePtr::BOTTOM or its twins
1871
1872 // the only remaining possible overlap is identity
1873 int adr_idx = get_alias_index(adr_type);
1874 assert(adr_idx != AliasIdxBot && adr_idx != AliasIdxTop, "");
1875 assert(adr_idx == alias_idx ||
1876 (alias_type(alias_idx)->adr_type() != TypeOopPtr::BOTTOM
1877 && adr_type != TypeOopPtr::BOTTOM),
1878 "should not be testing for overlap with an unsafe pointer");
1879 return adr_idx == alias_idx;
1880 }
1881
1882 //------------------------------can_alias--------------------------------------
1883 // True if any values of the given address type are in the given alias category.
1884 bool Compile::can_alias(const TypePtr* adr_type, int alias_idx) {
1885 if (alias_idx == AliasIdxTop) return false; // the empty category
1886 if (adr_type == nullptr) return false; // null serves as TypePtr::TOP
1887 // Known instance doesn't alias with bottom memory
1888 if (alias_idx == AliasIdxBot) return !adr_type->is_known_instance(); // the universal category
1889 if (adr_type->base() == Type::AnyPtr) return !C->get_adr_type(alias_idx)->is_known_instance(); // TypePtr::BOTTOM or its twins
1890
1891 // the only remaining possible overlap is identity
1892 int adr_idx = get_alias_index(adr_type);
1893 assert(adr_idx != AliasIdxBot && adr_idx != AliasIdxTop, "");
1894 return adr_idx == alias_idx;
1895 }
1896
1897 // Mark all ParsePredicateNodes as useless. They will later be removed from the graph in IGVN together with their
1898 // uncommon traps if no Runtime Predicates were created from the Parse Predicates.
1899 void Compile::mark_parse_predicate_nodes_useless(PhaseIterGVN& igvn) {
1900 if (parse_predicate_count() == 0) {
1901 return;
1902 }
1903 for (int i = 0; i < parse_predicate_count(); i++) {
1904 ParsePredicateNode* parse_predicate = _parse_predicates.at(i);
1905 parse_predicate->mark_useless(igvn);
1906 }
1907 _parse_predicates.clear();
1908 }
1909
1910 void Compile::record_for_post_loop_opts_igvn(Node* n) {
1911 if (!n->for_post_loop_opts_igvn()) {
1912 assert(!_for_post_loop_igvn.contains(n), "duplicate");
1913 n->add_flag(Node::NodeFlags::Flag_for_post_loop_opts_igvn);
1914 _for_post_loop_igvn.append(n);
1915 }
1916 }
1917
1918 void Compile::remove_from_post_loop_opts_igvn(Node* n) {
1919 n->remove_flag(Node::NodeFlags::Flag_for_post_loop_opts_igvn);
1920 _for_post_loop_igvn.remove(n);
1921 }
1922
1923 void Compile::process_for_post_loop_opts_igvn(PhaseIterGVN& igvn) {
1924 // Verify that all previous optimizations produced a valid graph
1925 // at least to this point, even if no loop optimizations were done.
1926 PhaseIdealLoop::verify(igvn);
1927
1928 if (has_loops() || _loop_opts_cnt > 0) {
1929 print_method(PHASE_AFTER_LOOP_OPTS, 2);
1930 }
1931 C->set_post_loop_opts_phase(); // no more loop opts allowed
1932
1933 assert(!C->major_progress(), "not cleared");
1934
1935 if (_for_post_loop_igvn.length() > 0) {
1936 while (_for_post_loop_igvn.length() > 0) {
1937 Node* n = _for_post_loop_igvn.pop();
1938 n->remove_flag(Node::NodeFlags::Flag_for_post_loop_opts_igvn);
1939 igvn._worklist.push(n);
1940 }
1941 igvn.optimize();
1942 if (failing()) return;
1943 assert(_for_post_loop_igvn.length() == 0, "no more delayed nodes allowed");
1944 assert(C->parse_predicate_count() == 0, "all parse predicates should have been removed now");
1945
1946 // Sometimes IGVN sets major progress (e.g., when processing loop nodes).
1947 if (C->major_progress()) {
1948 C->clear_major_progress(); // ensure that major progress is now clear
1949 }
1950 }
1951 }
1952
1953 void Compile::add_inline_type(Node* n) {
1954 assert(n->is_InlineType(), "unexpected node");
1955 _inline_type_nodes.push(n);
1956 }
1957
1958 void Compile::remove_inline_type(Node* n) {
1959 assert(n->is_InlineType(), "unexpected node");
1960 if (_inline_type_nodes.contains(n)) {
1961 _inline_type_nodes.remove(n);
1962 }
1963 }
1964
1965 // Does the return value keep otherwise useless inline type allocations alive?
1966 static bool return_val_keeps_allocations_alive(Node* ret_val) {
1967 ResourceMark rm;
1968 Unique_Node_List wq;
1969 wq.push(ret_val);
1970 bool some_allocations = false;
1971 for (uint i = 0; i < wq.size(); i++) {
1972 Node* n = wq.at(i);
1973 if (n->outcnt() > 1) {
1974 // Some other use for the allocation
1975 return false;
1976 } else if (n->is_InlineType()) {
1977 wq.push(n->in(1));
1978 } else if (n->is_Phi()) {
1979 for (uint j = 1; j < n->req(); j++) {
1980 wq.push(n->in(j));
1981 }
1982 } else if (n->is_CheckCastPP() &&
1983 n->in(1)->is_Proj() &&
1984 n->in(1)->in(0)->is_Allocate()) {
1985 some_allocations = true;
1986 } else if (n->is_CheckCastPP()) {
1987 wq.push(n->in(1));
1988 }
1989 }
1990 return some_allocations;
1991 }
1992
1993 void Compile::process_inline_types(PhaseIterGVN &igvn, bool remove) {
1994 // Make sure that the return value does not keep an otherwise unused allocation alive
1995 if (tf()->returns_inline_type_as_fields()) {
1996 Node* ret = nullptr;
1997 for (uint i = 1; i < root()->req(); i++) {
1998 Node* in = root()->in(i);
1999 if (in->Opcode() == Op_Return) {
2000 assert(ret == nullptr, "only one return");
2001 ret = in;
2002 }
2003 }
2004 if (ret != nullptr) {
2005 Node* ret_val = ret->in(TypeFunc::Parms);
2006 if (igvn.type(ret_val)->isa_oopptr() &&
2007 return_val_keeps_allocations_alive(ret_val)) {
2008 igvn.replace_input_of(ret, TypeFunc::Parms, InlineTypeNode::tagged_klass(igvn.type(ret_val)->inline_klass(), igvn));
2009 assert(ret_val->outcnt() == 0, "should be dead now");
2010 igvn.remove_dead_node(ret_val);
2011 }
2012 }
2013 }
2014 if (_inline_type_nodes.length() == 0) {
2015 return;
2016 }
2017 // Scalarize inline types in safepoint debug info.
2018 // Delay this until all inlining is over to avoid getting inconsistent debug info.
2019 set_scalarize_in_safepoints(true);
2020 for (int i = _inline_type_nodes.length()-1; i >= 0; i--) {
2021 InlineTypeNode* vt = _inline_type_nodes.at(i)->as_InlineType();
2022 vt->make_scalar_in_safepoints(&igvn);
2023 igvn.record_for_igvn(vt);
2024 }
2025 if (remove) {
2026 // Remove inline type nodes by replacing them with their oop input
2027 while (_inline_type_nodes.length() > 0) {
2028 InlineTypeNode* vt = _inline_type_nodes.pop()->as_InlineType();
2029 if (vt->outcnt() == 0) {
2030 igvn.remove_dead_node(vt);
2031 continue;
2032 }
2033 for (DUIterator i = vt->outs(); vt->has_out(i); i++) {
2034 DEBUG_ONLY(bool must_be_buffered = false);
2035 Node* u = vt->out(i);
2036 // Check if any users are blackholes. If so, rewrite them to use either the
2037 // allocated buffer, or individual components, instead of the inline type node
2038 // that goes away.
2039 if (u->is_Blackhole()) {
2040 BlackholeNode* bh = u->as_Blackhole();
2041
2042 // Unlink the old input
2043 int idx = bh->find_edge(vt);
2044 assert(idx != -1, "The edge should be there");
2045 bh->del_req(idx);
2046 --i;
2047
2048 if (vt->is_allocated(&igvn)) {
2049 // Already has the allocated instance, blackhole that
2050 bh->add_req(vt->get_oop());
2051 } else {
2052 // Not allocated yet, blackhole the components
2053 for (uint c = 0; c < vt->field_count(); c++) {
2054 bh->add_req(vt->field_value(c));
2055 }
2056 }
2057
2058 // Node modified, record for IGVN
2059 igvn.record_for_igvn(bh);
2060 }
2061 #ifdef ASSERT
2062 // Verify that inline type is buffered when replacing by oop
2063 else if (u->is_InlineType()) {
2064 // InlineType uses don't need buffering because they are about to be replaced as well
2065 } else if (u->is_Phi()) {
2066 // TODO 8302217 Remove this once InlineTypeNodes are reliably pushed through
2067 } else {
2068 must_be_buffered = true;
2069 }
2070 if (must_be_buffered && !vt->is_allocated(&igvn)) {
2071 vt->dump(0);
2072 u->dump(0);
2073 assert(false, "Should have been buffered");
2074 }
2075 #endif
2076 }
2077 igvn.replace_node(vt, vt->get_oop());
2078 }
2079 }
2080 igvn.optimize();
2081 }
2082
2083 void Compile::adjust_flat_array_access_aliases(PhaseIterGVN& igvn) {
2084 if (!_has_flat_accesses) {
2085 return;
2086 }
2087 // Initially, all flat array accesses share the same slice to
2088 // keep dependencies with Object[] array accesses (that could be
2089 // to a flat array) correct. We're done with parsing so we
2090 // now know all flat array accesses in this compile
2091 // unit. Let's move flat array accesses to their own slice,
2092 // one per element field. This should help memory access
2093 // optimizations.
2094 ResourceMark rm;
2095 Unique_Node_List wq;
2096 wq.push(root());
2097
2098 Node_List mergememnodes;
2099 Node_List memnodes;
2100
2101 // Alias index currently shared by all flat memory accesses
2102 int index = get_alias_index(TypeAryPtr::INLINES);
2103
2104 // Find MergeMem nodes and flat array accesses
2105 for (uint i = 0; i < wq.size(); i++) {
2106 Node* n = wq.at(i);
2107 if (n->is_Mem()) {
2108 const TypePtr* adr_type = nullptr;
2109 adr_type = get_adr_type(get_alias_index(n->adr_type()));
2110 if (adr_type == TypeAryPtr::INLINES) {
2111 memnodes.push(n);
2112 }
2113 } else if (n->is_MergeMem()) {
2114 MergeMemNode* mm = n->as_MergeMem();
2115 if (mm->memory_at(index) != mm->base_memory()) {
2116 mergememnodes.push(n);
2117 }
2118 }
2119 for (uint j = 0; j < n->req(); j++) {
2120 Node* m = n->in(j);
2121 if (m != nullptr) {
2122 wq.push(m);
2123 }
2124 }
2125 }
2126
2127 if (memnodes.size() > 0) {
2128 _flat_accesses_share_alias = false;
2129
2130 // We are going to change the slice for the flat array
2131 // accesses so we need to clear the cache entries that refer to
2132 // them.
2133 for (uint i = 0; i < AliasCacheSize; i++) {
2134 AliasCacheEntry* ace = &_alias_cache[i];
2135 if (ace->_adr_type != nullptr &&
2136 ace->_adr_type->is_flat()) {
2137 ace->_adr_type = nullptr;
2138 ace->_index = (i != 0) ? 0 : AliasIdxTop; // Make sure the nullptr adr_type resolves to AliasIdxTop
2139 }
2140 }
2141
2142 // Find what aliases we are going to add
2143 int start_alias = num_alias_types()-1;
2144 int stop_alias = 0;
2145
2146 for (uint i = 0; i < memnodes.size(); i++) {
2147 Node* m = memnodes.at(i);
2148 const TypePtr* adr_type = nullptr;
2149 adr_type = m->adr_type();
2150 #ifdef ASSERT
2151 m->as_Mem()->set_adr_type(adr_type);
2152 #endif
2153 int idx = get_alias_index(adr_type);
2154 start_alias = MIN2(start_alias, idx);
2155 stop_alias = MAX2(stop_alias, idx);
2156 }
2157
2158 assert(stop_alias >= start_alias, "should have expanded aliases");
2159
2160 Node_Stack stack(0);
2161 #ifdef ASSERT
2162 VectorSet seen(Thread::current()->resource_area());
2163 #endif
2164 // Now let's fix the memory graph so each flat array access
2165 // is moved to the right slice. Start from the MergeMem nodes.
2166 uint last = unique();
2167 for (uint i = 0; i < mergememnodes.size(); i++) {
2168 MergeMemNode* current = mergememnodes.at(i)->as_MergeMem();
2169 Node* n = current->memory_at(index);
2170 MergeMemNode* mm = nullptr;
2171 do {
2172 // Follow memory edges through memory accesses, phis and
2173 // narrow membars and push nodes on the stack. Once we hit
2174 // bottom memory, we pop element off the stack one at a
2175 // time, in reverse order, and move them to the right slice
2176 // by changing their memory edges.
2177 if ((n->is_Phi() && n->adr_type() != TypePtr::BOTTOM) || n->is_Mem() || n->adr_type() == TypeAryPtr::INLINES) {
2178 assert(!seen.test_set(n->_idx), "");
2179 // Uses (a load for instance) will need to be moved to the
2180 // right slice as well and will get a new memory state
2181 // that we don't know yet. The use could also be the
2182 // backedge of a loop. We put a place holder node between
2183 // the memory node and its uses. We replace that place
2184 // holder with the correct memory state once we know it,
2185 // i.e. when nodes are popped off the stack. Using the
2186 // place holder make the logic work in the presence of
2187 // loops.
2188 if (n->outcnt() > 1) {
2189 Node* place_holder = nullptr;
2190 assert(!n->has_out_with(Op_Node), "");
2191 for (DUIterator k = n->outs(); n->has_out(k); k++) {
2192 Node* u = n->out(k);
2193 if (u != current && u->_idx < last) {
2194 bool success = false;
2195 for (uint l = 0; l < u->req(); l++) {
2196 if (!stack.is_empty() && u == stack.node() && l == stack.index()) {
2197 continue;
2198 }
2199 Node* in = u->in(l);
2200 if (in == n) {
2201 if (place_holder == nullptr) {
2202 place_holder = new Node(1);
2203 place_holder->init_req(0, n);
2204 }
2205 igvn.replace_input_of(u, l, place_holder);
2206 success = true;
2207 }
2208 }
2209 if (success) {
2210 --k;
2211 }
2212 }
2213 }
2214 }
2215 if (n->is_Phi()) {
2216 stack.push(n, 1);
2217 n = n->in(1);
2218 } else if (n->is_Mem()) {
2219 stack.push(n, n->req());
2220 n = n->in(MemNode::Memory);
2221 } else {
2222 assert(n->is_Proj() && n->in(0)->Opcode() == Op_MemBarCPUOrder, "");
2223 stack.push(n, n->req());
2224 n = n->in(0)->in(TypeFunc::Memory);
2225 }
2226 } else {
2227 assert(n->adr_type() == TypePtr::BOTTOM || (n->Opcode() == Op_Node && n->_idx >= last) || (n->is_Proj() && n->in(0)->is_Initialize()), "");
2228 // Build a new MergeMem node to carry the new memory state
2229 // as we build it. IGVN should fold extraneous MergeMem
2230 // nodes.
2231 mm = MergeMemNode::make(n);
2232 igvn.register_new_node_with_optimizer(mm);
2233 while (stack.size() > 0) {
2234 Node* m = stack.node();
2235 uint idx = stack.index();
2236 if (m->is_Mem()) {
2237 // Move memory node to its new slice
2238 const TypePtr* adr_type = m->adr_type();
2239 int alias = get_alias_index(adr_type);
2240 Node* prev = mm->memory_at(alias);
2241 igvn.replace_input_of(m, MemNode::Memory, prev);
2242 mm->set_memory_at(alias, m);
2243 } else if (m->is_Phi()) {
2244 // We need as many new phis as there are new aliases
2245 igvn.replace_input_of(m, idx, mm);
2246 if (idx == m->req()-1) {
2247 Node* r = m->in(0);
2248 for (uint j = (uint)start_alias; j <= (uint)stop_alias; j++) {
2249 const TypePtr* adr_type = get_adr_type(j);
2250 if (!adr_type->isa_aryptr() || !adr_type->is_flat() || j == (uint)index) {
2251 continue;
2252 }
2253 Node* phi = new PhiNode(r, Type::MEMORY, get_adr_type(j));
2254 igvn.register_new_node_with_optimizer(phi);
2255 for (uint k = 1; k < m->req(); k++) {
2256 phi->init_req(k, m->in(k)->as_MergeMem()->memory_at(j));
2257 }
2258 mm->set_memory_at(j, phi);
2259 }
2260 Node* base_phi = new PhiNode(r, Type::MEMORY, TypePtr::BOTTOM);
2261 igvn.register_new_node_with_optimizer(base_phi);
2262 for (uint k = 1; k < m->req(); k++) {
2263 base_phi->init_req(k, m->in(k)->as_MergeMem()->base_memory());
2264 }
2265 mm->set_base_memory(base_phi);
2266 }
2267 } else {
2268 // This is a MemBarCPUOrder node from
2269 // Parse::array_load()/Parse::array_store(), in the
2270 // branch that handles flat arrays hidden under
2271 // an Object[] array. We also need one new membar per
2272 // new alias to keep the unknown access that the
2273 // membars protect properly ordered with accesses to
2274 // known flat array.
2275 assert(m->is_Proj(), "projection expected");
2276 Node* ctrl = m->in(0)->in(TypeFunc::Control);
2277 igvn.replace_input_of(m->in(0), TypeFunc::Control, top());
2278 for (uint j = (uint)start_alias; j <= (uint)stop_alias; j++) {
2279 const TypePtr* adr_type = get_adr_type(j);
2280 if (!adr_type->isa_aryptr() || !adr_type->is_flat() || j == (uint)index) {
2281 continue;
2282 }
2283 MemBarNode* mb = new MemBarCPUOrderNode(this, j, nullptr);
2284 igvn.register_new_node_with_optimizer(mb);
2285 Node* mem = mm->memory_at(j);
2286 mb->init_req(TypeFunc::Control, ctrl);
2287 mb->init_req(TypeFunc::Memory, mem);
2288 ctrl = new ProjNode(mb, TypeFunc::Control);
2289 igvn.register_new_node_with_optimizer(ctrl);
2290 mem = new ProjNode(mb, TypeFunc::Memory);
2291 igvn.register_new_node_with_optimizer(mem);
2292 mm->set_memory_at(j, mem);
2293 }
2294 igvn.replace_node(m->in(0)->as_Multi()->proj_out(TypeFunc::Control), ctrl);
2295 }
2296 if (idx < m->req()-1) {
2297 idx += 1;
2298 stack.set_index(idx);
2299 n = m->in(idx);
2300 break;
2301 }
2302 // Take care of place holder nodes
2303 if (m->has_out_with(Op_Node)) {
2304 Node* place_holder = m->find_out_with(Op_Node);
2305 if (place_holder != nullptr) {
2306 Node* mm_clone = mm->clone();
2307 igvn.register_new_node_with_optimizer(mm_clone);
2308 Node* hook = new Node(1);
2309 hook->init_req(0, mm);
2310 igvn.replace_node(place_holder, mm_clone);
2311 hook->destruct(&igvn);
2312 }
2313 assert(!m->has_out_with(Op_Node), "place holder should be gone now");
2314 }
2315 stack.pop();
2316 }
2317 }
2318 } while(stack.size() > 0);
2319 // Fix the memory state at the MergeMem we started from
2320 igvn.rehash_node_delayed(current);
2321 for (uint j = (uint)start_alias; j <= (uint)stop_alias; j++) {
2322 const TypePtr* adr_type = get_adr_type(j);
2323 if (!adr_type->isa_aryptr() || !adr_type->is_flat()) {
2324 continue;
2325 }
2326 current->set_memory_at(j, mm);
2327 }
2328 current->set_memory_at(index, current->base_memory());
2329 }
2330 igvn.optimize();
2331 }
2332 print_method(PHASE_SPLIT_INLINES_ARRAY, 2);
2333 #ifdef ASSERT
2334 if (!_flat_accesses_share_alias) {
2335 wq.clear();
2336 wq.push(root());
2337 for (uint i = 0; i < wq.size(); i++) {
2338 Node* n = wq.at(i);
2339 assert(n->adr_type() != TypeAryPtr::INLINES, "should have been removed from the graph");
2340 for (uint j = 0; j < n->req(); j++) {
2341 Node* m = n->in(j);
2342 if (m != nullptr) {
2343 wq.push(m);
2344 }
2345 }
2346 }
2347 }
2348 #endif
2349 }
2350
2351 void Compile::record_for_merge_stores_igvn(Node* n) {
2352 if (!n->for_merge_stores_igvn()) {
2353 assert(!_for_merge_stores_igvn.contains(n), "duplicate");
2354 n->add_flag(Node::NodeFlags::Flag_for_merge_stores_igvn);
2355 _for_merge_stores_igvn.append(n);
2356 }
2357 }
2358
2359 void Compile::remove_from_merge_stores_igvn(Node* n) {
2360 n->remove_flag(Node::NodeFlags::Flag_for_merge_stores_igvn);
2361 _for_merge_stores_igvn.remove(n);
2362 }
2363
2364 // We need to wait with merging stores until RangeCheck smearing has removed the RangeChecks during
2365 // the post loops IGVN phase. If we do it earlier, then there may still be some RangeChecks between
2366 // the stores, and we merge the wrong sequence of stores.
2367 // Example:
2368 // StoreI RangeCheck StoreI StoreI RangeCheck StoreI
2369 // Apply MergeStores:
2370 // StoreI RangeCheck [ StoreL ] RangeCheck StoreI
2371 // Remove more RangeChecks:
2372 // StoreI [ StoreL ] StoreI
2373 // But now it would have been better to do this instead:
2374 // [ StoreL ] [ StoreL ]
2375 //
2376 // Note: we allow stores to merge in this dedicated IGVN round, and any later IGVN round,
2377 // since we never unset _merge_stores_phase.
2378 void Compile::process_for_merge_stores_igvn(PhaseIterGVN& igvn) {
2379 C->set_merge_stores_phase();
2380
2381 if (_for_merge_stores_igvn.length() > 0) {
2382 while (_for_merge_stores_igvn.length() > 0) {
2383 Node* n = _for_merge_stores_igvn.pop();
2384 n->remove_flag(Node::NodeFlags::Flag_for_merge_stores_igvn);
2385 igvn._worklist.push(n);
2386 }
2387 igvn.optimize();
2388 if (failing()) return;
2389 assert(_for_merge_stores_igvn.length() == 0, "no more delayed nodes allowed");
2390 print_method(PHASE_AFTER_MERGE_STORES, 3);
2391 }
2392 }
2393
2394 void Compile::record_unstable_if_trap(UnstableIfTrap* trap) {
2395 if (OptimizeUnstableIf) {
2396 _unstable_if_traps.append(trap);
2397 }
2398 }
2399
2400 void Compile::remove_useless_unstable_if_traps(Unique_Node_List& useful) {
2401 for (int i = _unstable_if_traps.length() - 1; i >= 0; i--) {
2402 UnstableIfTrap* trap = _unstable_if_traps.at(i);
2403 Node* n = trap->uncommon_trap();
2404 if (!useful.member(n)) {
2405 _unstable_if_traps.delete_at(i); // replaces i-th with last element which is known to be useful (already processed)
2406 }
2407 }
2408 }
2409
2410 // Remove the unstable if trap associated with 'unc' from candidates. It is either dead
2411 // or fold-compares case. Return true if succeed or not found.
2412 //
2413 // In rare cases, the found trap has been processed. It is too late to delete it. Return
2414 // false and ask fold-compares to yield.
2415 //
2416 // 'fold-compares' may use the uncommon_trap of the dominating IfNode to cover the fused
2417 // IfNode. This breaks the unstable_if trap invariant: control takes the unstable path
2418 // when deoptimization does happen.
2419 bool Compile::remove_unstable_if_trap(CallStaticJavaNode* unc, bool yield) {
2420 for (int i = 0; i < _unstable_if_traps.length(); ++i) {
2421 UnstableIfTrap* trap = _unstable_if_traps.at(i);
2422 if (trap->uncommon_trap() == unc) {
2423 if (yield && trap->modified()) {
2424 return false;
2425 }
2426 _unstable_if_traps.delete_at(i);
2427 break;
2428 }
2429 }
2430 return true;
2431 }
2432
2433 // Re-calculate unstable_if traps with the liveness of next_bci, which points to the unlikely path.
2434 // It needs to be done after igvn because fold-compares may fuse uncommon_traps and before renumbering.
2435 void Compile::process_for_unstable_if_traps(PhaseIterGVN& igvn) {
2436 for (int i = _unstable_if_traps.length() - 1; i >= 0; --i) {
2437 UnstableIfTrap* trap = _unstable_if_traps.at(i);
2438 CallStaticJavaNode* unc = trap->uncommon_trap();
2439 int next_bci = trap->next_bci();
2440 bool modified = trap->modified();
2441
2442 if (next_bci != -1 && !modified) {
2443 assert(!_dead_node_list.test(unc->_idx), "changing a dead node!");
2444 JVMState* jvms = unc->jvms();
2445 ciMethod* method = jvms->method();
2446 ciBytecodeStream iter(method);
2447
2448 iter.force_bci(jvms->bci());
2449 assert(next_bci == iter.next_bci() || next_bci == iter.get_dest(), "wrong next_bci at unstable_if");
2450 Bytecodes::Code c = iter.cur_bc();
2451 Node* lhs = nullptr;
2452 Node* rhs = nullptr;
2453 if (c == Bytecodes::_if_acmpeq || c == Bytecodes::_if_acmpne) {
2454 lhs = unc->peek_operand(0);
2455 rhs = unc->peek_operand(1);
2456 } else if (c == Bytecodes::_ifnull || c == Bytecodes::_ifnonnull) {
2457 lhs = unc->peek_operand(0);
2458 }
2459
2460 ResourceMark rm;
2461 const MethodLivenessResult& live_locals = method->liveness_at_bci(next_bci);
2462 assert(live_locals.is_valid(), "broken liveness info");
2463 int len = (int)live_locals.size();
2464
2465 for (int i = 0; i < len; i++) {
2466 Node* local = unc->local(jvms, i);
2467 // kill local using the liveness of next_bci.
2468 // give up when the local looks like an operand to secure reexecution.
2469 if (!live_locals.at(i) && !local->is_top() && local != lhs && local != rhs) {
2470 uint idx = jvms->locoff() + i;
2471 #ifdef ASSERT
2472 if (PrintOpto && Verbose) {
2473 tty->print("[unstable_if] kill local#%d: ", idx);
2474 local->dump();
2475 tty->cr();
2476 }
2477 #endif
2478 igvn.replace_input_of(unc, idx, top());
2479 modified = true;
2480 }
2481 }
2482 }
2483
2484 // keep the modified trap for late query
2485 if (modified) {
2486 trap->set_modified();
2487 } else {
2488 _unstable_if_traps.delete_at(i);
2489 }
2490 }
2491 igvn.optimize();
2492 }
2493
2494 // StringOpts and late inlining of string methods
2495 void Compile::inline_string_calls(bool parse_time) {
2496 {
2497 // remove useless nodes to make the usage analysis simpler
2498 ResourceMark rm;
2499 PhaseRemoveUseless pru(initial_gvn(), *igvn_worklist());
2500 }
2501
2502 {
2503 ResourceMark rm;
2504 print_method(PHASE_BEFORE_STRINGOPTS, 3);
2505 PhaseStringOpts pso(initial_gvn());
2506 print_method(PHASE_AFTER_STRINGOPTS, 3);
2507 }
2508
2509 // now inline anything that we skipped the first time around
2510 if (!parse_time) {
2511 _late_inlines_pos = _late_inlines.length();
2512 }
2513
2514 while (_string_late_inlines.length() > 0) {
2515 CallGenerator* cg = _string_late_inlines.pop();
2516 cg->do_late_inline();
2517 if (failing()) return;
2518 }
2519 _string_late_inlines.trunc_to(0);
2520 }
2521
2522 // Late inlining of boxing methods
2523 void Compile::inline_boxing_calls(PhaseIterGVN& igvn) {
2524 if (_boxing_late_inlines.length() > 0) {
2525 assert(has_boxed_value(), "inconsistent");
2526
2527 set_inlining_incrementally(true);
2528
2529 igvn_worklist()->ensure_empty(); // should be done with igvn
2530
2531 _late_inlines_pos = _late_inlines.length();
2532
2533 while (_boxing_late_inlines.length() > 0) {
2534 CallGenerator* cg = _boxing_late_inlines.pop();
2535 cg->do_late_inline();
2536 if (failing()) return;
2537 }
2538 _boxing_late_inlines.trunc_to(0);
2539
2540 inline_incrementally_cleanup(igvn);
2541
2542 set_inlining_incrementally(false);
2543 }
2544 }
2545
2546 bool Compile::inline_incrementally_one() {
2547 assert(IncrementalInline, "incremental inlining should be on");
2548
2549 TracePhase tp(_t_incrInline_inline);
2550
2551 set_inlining_progress(false);
2552 set_do_cleanup(false);
2553
2554 for (int i = 0; i < _late_inlines.length(); i++) {
2555 _late_inlines_pos = i+1;
2556 CallGenerator* cg = _late_inlines.at(i);
2557 bool is_scheduled_for_igvn_before = C->igvn_worklist()->member(cg->call_node());
2558 bool does_dispatch = cg->is_virtual_late_inline() || cg->is_mh_late_inline();
2559 if (inlining_incrementally() || does_dispatch) { // a call can be either inlined or strength-reduced to a direct call
2560 cg->do_late_inline();
2561 assert(_late_inlines.at(i) == cg, "no insertions before current position allowed");
2562 if (failing()) {
2563 return false;
2564 } else if (inlining_progress()) {
2565 _late_inlines_pos = i+1; // restore the position in case new elements were inserted
2566 print_method(PHASE_INCREMENTAL_INLINE_STEP, 3, cg->call_node());
2567 break; // process one call site at a time
2568 } else {
2569 bool is_scheduled_for_igvn_after = C->igvn_worklist()->member(cg->call_node());
2570 if (!is_scheduled_for_igvn_before && is_scheduled_for_igvn_after) {
2571 // Avoid potential infinite loop if node already in the IGVN list
2572 assert(false, "scheduled for IGVN during inlining attempt");
2573 } else {
2574 // Ensure call node has not disappeared from IGVN worklist during a failed inlining attempt
2575 assert(!is_scheduled_for_igvn_before || is_scheduled_for_igvn_after, "call node removed from IGVN list during inlining pass");
2576 cg->call_node()->set_generator(cg);
2577 }
2578 }
2579 } else {
2580 // Ignore late inline direct calls when inlining is not allowed.
2581 // They are left in the late inline list when node budget is exhausted until the list is fully drained.
2582 }
2583 }
2584 // Remove processed elements.
2585 _late_inlines.remove_till(_late_inlines_pos);
2586 _late_inlines_pos = 0;
2587
2588 assert(inlining_progress() || _late_inlines.length() == 0, "no progress");
2589
2590 bool needs_cleanup = do_cleanup() || over_inlining_cutoff();
2591
2592 set_inlining_progress(false);
2593 set_do_cleanup(false);
2594
2595 bool force_cleanup = directive()->IncrementalInlineForceCleanupOption;
2596 return (_late_inlines.length() > 0) && !needs_cleanup && !force_cleanup;
2597 }
2598
2599 void Compile::inline_incrementally_cleanup(PhaseIterGVN& igvn) {
2600 {
2601 TracePhase tp(_t_incrInline_pru);
2602 ResourceMark rm;
2603 PhaseRemoveUseless pru(initial_gvn(), *igvn_worklist());
2604 }
2605 {
2606 TracePhase tp(_t_incrInline_igvn);
2607 igvn.reset_from_gvn(initial_gvn());
2608 igvn.optimize();
2609 if (failing()) return;
2610 }
2611 print_method(PHASE_INCREMENTAL_INLINE_CLEANUP, 3);
2612 }
2613
2614 // Perform incremental inlining until bound on number of live nodes is reached
2615 void Compile::inline_incrementally(PhaseIterGVN& igvn) {
2616 TracePhase tp(_t_incrInline);
2617
2618 set_inlining_incrementally(true);
2619 uint low_live_nodes = 0;
2620
2621 while (_late_inlines.length() > 0) {
2622 if (live_nodes() > (uint)LiveNodeCountInliningCutoff) {
2623 if (low_live_nodes < (uint)LiveNodeCountInliningCutoff * 8 / 10) {
2624 TracePhase tp(_t_incrInline_ideal);
2625 // PhaseIdealLoop is expensive so we only try it once we are
2626 // out of live nodes and we only try it again if the previous
2627 // helped got the number of nodes down significantly
2628 PhaseIdealLoop::optimize(igvn, LoopOptsNone);
2629 if (failing()) return;
2630 low_live_nodes = live_nodes();
2631 _major_progress = true;
2632 }
2633
2634 if (live_nodes() > (uint)LiveNodeCountInliningCutoff) {
2635 bool do_print_inlining = print_inlining() || print_intrinsics();
2636 if (do_print_inlining || log() != nullptr) {
2637 // Print inlining message for candidates that we couldn't inline for lack of space.
2638 for (int i = 0; i < _late_inlines.length(); i++) {
2639 CallGenerator* cg = _late_inlines.at(i);
2640 const char* msg = "live nodes > LiveNodeCountInliningCutoff";
2641 if (do_print_inlining) {
2642 inline_printer()->record(cg->method(), cg->call_node()->jvms(), InliningResult::FAILURE, msg);
2643 }
2644 log_late_inline_failure(cg, msg);
2645 }
2646 }
2647 break; // finish
2648 }
2649 }
2650
2651 igvn_worklist()->ensure_empty(); // should be done with igvn
2652
2653 while (inline_incrementally_one()) {
2654 assert(!failing_internal() || failure_is_artificial(), "inconsistent");
2655 }
2656 if (failing()) return;
2657
2658 inline_incrementally_cleanup(igvn);
2659
2660 print_method(PHASE_INCREMENTAL_INLINE_STEP, 3);
2661
2662 if (failing()) return;
2663
2664 if (_late_inlines.length() == 0) {
2665 break; // no more progress
2666 }
2667 }
2668
2669 igvn_worklist()->ensure_empty(); // should be done with igvn
2670
2671 if (_string_late_inlines.length() > 0) {
2672 assert(has_stringbuilder(), "inconsistent");
2673
2674 inline_string_calls(false);
2675
2676 if (failing()) return;
2677
2678 inline_incrementally_cleanup(igvn);
2679 }
2680
2681 set_inlining_incrementally(false);
2682 }
2683
2684 void Compile::process_late_inline_calls_no_inline(PhaseIterGVN& igvn) {
2685 // "inlining_incrementally() == false" is used to signal that no inlining is allowed
2686 // (see LateInlineVirtualCallGenerator::do_late_inline_check() for details).
2687 // Tracking and verification of modified nodes is disabled by setting "_modified_nodes == nullptr"
2688 // as if "inlining_incrementally() == true" were set.
2689 assert(inlining_incrementally() == false, "not allowed");
2690 #ifdef ASSERT
2691 Unique_Node_List* modified_nodes = _modified_nodes;
2692 _modified_nodes = nullptr;
2693 #endif
2694 assert(_late_inlines.length() > 0, "sanity");
2695
2696 while (_late_inlines.length() > 0) {
2697 igvn_worklist()->ensure_empty(); // should be done with igvn
2698
2699 while (inline_incrementally_one()) {
2700 assert(!failing_internal() || failure_is_artificial(), "inconsistent");
2701 }
2702 if (failing()) return;
2703
2704 inline_incrementally_cleanup(igvn);
2705 }
2706 DEBUG_ONLY( _modified_nodes = modified_nodes; )
2707 }
2708
2709 bool Compile::optimize_loops(PhaseIterGVN& igvn, LoopOptsMode mode) {
2710 if (_loop_opts_cnt > 0) {
2711 while (major_progress() && (_loop_opts_cnt > 0)) {
2712 TracePhase tp(_t_idealLoop);
2713 PhaseIdealLoop::optimize(igvn, mode);
2714 _loop_opts_cnt--;
2715 if (failing()) return false;
2716 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP_ITERATIONS, 2);
2717 }
2718 }
2719 return true;
2720 }
2721
2722 // Remove edges from "root" to each SafePoint at a backward branch.
2723 // They were inserted during parsing (see add_safepoint()) to make
2724 // infinite loops without calls or exceptions visible to root, i.e.,
2725 // useful.
2726 void Compile::remove_root_to_sfpts_edges(PhaseIterGVN& igvn) {
2727 Node *r = root();
2728 if (r != nullptr) {
2729 for (uint i = r->req(); i < r->len(); ++i) {
2730 Node *n = r->in(i);
2731 if (n != nullptr && n->is_SafePoint()) {
2732 r->rm_prec(i);
2733 if (n->outcnt() == 0) {
2734 igvn.remove_dead_node(n);
2735 }
2736 --i;
2737 }
2738 }
2739 // Parsing may have added top inputs to the root node (Path
2740 // leading to the Halt node proven dead). Make sure we get a
2741 // chance to clean them up.
2742 igvn._worklist.push(r);
2743 igvn.optimize();
2744 }
2745 }
2746
2747 //------------------------------Optimize---------------------------------------
2748 // Given a graph, optimize it.
2749 void Compile::Optimize() {
2750 TracePhase tp(_t_optimizer);
2751
2752 #ifndef PRODUCT
2753 if (env()->break_at_compile()) {
2754 BREAKPOINT;
2755 }
2756
2757 #endif
2758
2759 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
2760 #ifdef ASSERT
2761 bs->verify_gc_barriers(this, BarrierSetC2::BeforeOptimize);
2762 #endif
2763
2764 ResourceMark rm;
2765
2766 NOT_PRODUCT( verify_graph_edges(); )
2767
2768 print_method(PHASE_AFTER_PARSING, 1);
2769
2770 {
2771 // Iterative Global Value Numbering, including ideal transforms
2772 // Initialize IterGVN with types and values from parse-time GVN
2773 PhaseIterGVN igvn(initial_gvn());
2774 #ifdef ASSERT
2775 _modified_nodes = new (comp_arena()) Unique_Node_List(comp_arena());
2776 #endif
2777 {
2778 TracePhase tp(_t_iterGVN);
2779 igvn.optimize();
2780 }
2781
2782 if (failing()) return;
2783
2784 print_method(PHASE_ITER_GVN1, 2);
2785
2786 process_for_unstable_if_traps(igvn);
2787
2788 if (failing()) return;
2789
2790 inline_incrementally(igvn);
2791
2792 print_method(PHASE_INCREMENTAL_INLINE, 2);
2793
2794 if (failing()) return;
2795
2796 if (eliminate_boxing()) {
2797 // Inline valueOf() methods now.
2798 inline_boxing_calls(igvn);
2799
2800 if (failing()) return;
2801
2802 if (AlwaysIncrementalInline || StressIncrementalInlining) {
2803 inline_incrementally(igvn);
2804 }
2805
2806 print_method(PHASE_INCREMENTAL_BOXING_INLINE, 2);
2807
2808 if (failing()) return;
2809 }
2810
2811 // Remove the speculative part of types and clean up the graph from
2812 // the extra CastPP nodes whose only purpose is to carry them. Do
2813 // that early so that optimizations are not disrupted by the extra
2814 // CastPP nodes.
2815 remove_speculative_types(igvn);
2816
2817 if (failing()) return;
2818
2819 // No more new expensive nodes will be added to the list from here
2820 // so keep only the actual candidates for optimizations.
2821 cleanup_expensive_nodes(igvn);
2822
2823 if (failing()) return;
2824
2825 assert(EnableVectorSupport || !has_vbox_nodes(), "sanity");
2826 if (EnableVectorSupport && has_vbox_nodes()) {
2827 TracePhase tp(_t_vector);
2828 PhaseVector pv(igvn);
2829 pv.optimize_vector_boxes();
2830 if (failing()) return;
2831 print_method(PHASE_ITER_GVN_AFTER_VECTOR, 2);
2832 }
2833 assert(!has_vbox_nodes(), "sanity");
2834
2835 if (!failing() && RenumberLiveNodes && live_nodes() + NodeLimitFudgeFactor < unique()) {
2836 Compile::TracePhase tp(_t_renumberLive);
2837 igvn_worklist()->ensure_empty(); // should be done with igvn
2838 {
2839 ResourceMark rm;
2840 PhaseRenumberLive prl(initial_gvn(), *igvn_worklist());
2841 }
2842 igvn.reset_from_gvn(initial_gvn());
2843 igvn.optimize();
2844 if (failing()) return;
2845 }
2846
2847 // Now that all inlining is over and no PhaseRemoveUseless will run, cut edge from root to loop
2848 // safepoints
2849 remove_root_to_sfpts_edges(igvn);
2850
2851 // Process inline type nodes now that all inlining is over
2852 process_inline_types(igvn);
2853
2854 adjust_flat_array_access_aliases(igvn);
2855
2856 if (failing()) return;
2857
2858 if (C->macro_count() > 0) {
2859 // Eliminate some macro nodes before EA to reduce analysis pressure
2860 PhaseMacroExpand mexp(igvn);
2861 mexp.eliminate_macro_nodes();
2862 if (failing()) {
2863 return;
2864 }
2865 igvn.set_delay_transform(false);
2866 print_method(PHASE_ITER_GVN_AFTER_ELIMINATION, 2);
2867 }
2868
2869 if (has_loops()) {
2870 print_method(PHASE_BEFORE_LOOP_OPTS, 2);
2871 }
2872
2873 // Perform escape analysis
2874 if (do_escape_analysis() && ConnectionGraph::has_candidates(this)) {
2875 if (has_loops()) {
2876 // Cleanup graph (remove dead nodes).
2877 TracePhase tp(_t_idealLoop);
2878 PhaseIdealLoop::optimize(igvn, LoopOptsMaxUnroll);
2879 if (failing()) {
2880 return;
2881 }
2882 print_method(PHASE_PHASEIDEAL_BEFORE_EA, 2);
2883 if (C->macro_count() > 0) {
2884 // Eliminate some macro nodes before EA to reduce analysis pressure
2885 PhaseMacroExpand mexp(igvn);
2886 mexp.eliminate_macro_nodes();
2887 if (failing()) {
2888 return;
2889 }
2890 igvn.set_delay_transform(false);
2891 print_method(PHASE_ITER_GVN_AFTER_ELIMINATION, 2);
2892 }
2893 }
2894
2895 bool progress;
2896 do {
2897 ConnectionGraph::do_analysis(this, &igvn);
2898
2899 if (failing()) return;
2900
2901 int mcount = macro_count(); // Record number of allocations and locks before IGVN
2902
2903 // Optimize out fields loads from scalar replaceable allocations.
2904 igvn.optimize();
2905 print_method(PHASE_ITER_GVN_AFTER_EA, 2);
2906
2907 if (failing()) return;
2908
2909 if (congraph() != nullptr && macro_count() > 0) {
2910 TracePhase tp(_t_macroEliminate);
2911 PhaseMacroExpand mexp(igvn);
2912 mexp.eliminate_macro_nodes();
2913 if (failing()) {
2914 return;
2915 }
2916 igvn.set_delay_transform(false);
2917 print_method(PHASE_ITER_GVN_AFTER_ELIMINATION, 2);
2918 }
2919
2920 ConnectionGraph::verify_ram_nodes(this, root());
2921 if (failing()) return;
2922
2923 progress = do_iterative_escape_analysis() &&
2924 (macro_count() < mcount) &&
2925 ConnectionGraph::has_candidates(this);
2926 // Try again if candidates exist and made progress
2927 // by removing some allocations and/or locks.
2928 } while (progress);
2929 }
2930
2931 // Loop transforms on the ideal graph. Range Check Elimination,
2932 // peeling, unrolling, etc.
2933
2934 // Set loop opts counter
2935 if((_loop_opts_cnt > 0) && (has_loops() || has_split_ifs())) {
2936 {
2937 TracePhase tp(_t_idealLoop);
2938 PhaseIdealLoop::optimize(igvn, LoopOptsDefault);
2939 _loop_opts_cnt--;
2940 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP1, 2);
2941 if (failing()) return;
2942 }
2943 // Loop opts pass if partial peeling occurred in previous pass
2944 if(PartialPeelLoop && major_progress() && (_loop_opts_cnt > 0)) {
2945 TracePhase tp(_t_idealLoop);
2946 PhaseIdealLoop::optimize(igvn, LoopOptsSkipSplitIf);
2947 _loop_opts_cnt--;
2948 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP2, 2);
2949 if (failing()) return;
2950 }
2951 // Loop opts pass for loop-unrolling before CCP
2952 if(major_progress() && (_loop_opts_cnt > 0)) {
2953 TracePhase tp(_t_idealLoop);
2954 PhaseIdealLoop::optimize(igvn, LoopOptsSkipSplitIf);
2955 _loop_opts_cnt--;
2956 if (major_progress()) print_method(PHASE_PHASEIDEALLOOP3, 2);
2957 }
2958 if (!failing()) {
2959 // Verify that last round of loop opts produced a valid graph
2960 PhaseIdealLoop::verify(igvn);
2961 }
2962 }
2963 if (failing()) return;
2964
2965 // Conditional Constant Propagation;
2966 print_method(PHASE_BEFORE_CCP1, 2);
2967 PhaseCCP ccp( &igvn );
2968 assert( true, "Break here to ccp.dump_nodes_and_types(_root,999,1)");
2969 {
2970 TracePhase tp(_t_ccp);
2971 ccp.do_transform();
2972 }
2973 print_method(PHASE_CCP1, 2);
2974
2975 assert( true, "Break here to ccp.dump_old2new_map()");
2976
2977 // Iterative Global Value Numbering, including ideal transforms
2978 {
2979 TracePhase tp(_t_iterGVN2);
2980 igvn.reset_from_igvn(&ccp);
2981 igvn.optimize();
2982 }
2983 print_method(PHASE_ITER_GVN2, 2);
2984
2985 if (failing()) return;
2986
2987 // Loop transforms on the ideal graph. Range Check Elimination,
2988 // peeling, unrolling, etc.
2989 if (!optimize_loops(igvn, LoopOptsDefault)) {
2990 return;
2991 }
2992
2993 if (failing()) return;
2994
2995 C->clear_major_progress(); // ensure that major progress is now clear
2996
2997 process_for_post_loop_opts_igvn(igvn);
2998
2999 process_for_merge_stores_igvn(igvn);
3000
3001 if (failing()) return;
3002
3003 #ifdef ASSERT
3004 bs->verify_gc_barriers(this, BarrierSetC2::BeforeMacroExpand);
3005 #endif
3006
3007 assert(_late_inlines.length() == 0 || IncrementalInlineMH || IncrementalInlineVirtual, "not empty");
3008
3009 if (_late_inlines.length() > 0) {
3010 // More opportunities to optimize virtual and MH calls.
3011 // Though it's maybe too late to perform inlining, strength-reducing them to direct calls is still an option.
3012 process_late_inline_calls_no_inline(igvn);
3013 }
3014
3015 {
3016 TracePhase tp(_t_macroExpand);
3017 PhaseMacroExpand mex(igvn);
3018 // Last attempt to eliminate macro nodes.
3019 mex.eliminate_macro_nodes();
3020 if (failing()) {
3021 return;
3022 }
3023
3024 print_method(PHASE_BEFORE_MACRO_EXPANSION, 3);
3025 if (mex.expand_macro_nodes()) {
3026 assert(failing(), "must bail out w/ explicit message");
3027 return;
3028 }
3029 print_method(PHASE_AFTER_MACRO_EXPANSION, 2);
3030 }
3031
3032 // Process inline type nodes again and remove them. From here
3033 // on we don't need to keep track of field values anymore.
3034 process_inline_types(igvn, /* remove= */ true);
3035
3036 {
3037 TracePhase tp(_t_barrierExpand);
3038 if (bs->expand_barriers(this, igvn)) {
3039 assert(failing(), "must bail out w/ explicit message");
3040 return;
3041 }
3042 print_method(PHASE_BARRIER_EXPANSION, 2);
3043 }
3044
3045 if (C->max_vector_size() > 0) {
3046 C->optimize_logic_cones(igvn);
3047 igvn.optimize();
3048 if (failing()) return;
3049 }
3050
3051 DEBUG_ONLY( _modified_nodes = nullptr; )
3052 DEBUG_ONLY( _late_inlines.clear(); )
3053
3054 assert(igvn._worklist.size() == 0, "not empty");
3055 } // (End scope of igvn; run destructor if necessary for asserts.)
3056
3057 check_no_dead_use();
3058
3059 // We will never use the NodeHash table any more. Clear it so that final_graph_reshaping does not have
3060 // to remove hashes to unlock nodes for modifications.
3061 C->node_hash()->clear();
3062
3063 // A method with only infinite loops has no edges entering loops from root
3064 {
3065 TracePhase tp(_t_graphReshaping);
3066 if (final_graph_reshaping()) {
3067 assert(failing(), "must bail out w/ explicit message");
3068 return;
3069 }
3070 }
3071
3072 print_method(PHASE_OPTIMIZE_FINISHED, 2);
3073 DEBUG_ONLY(set_phase_optimize_finished();)
3074 }
3075
3076 #ifdef ASSERT
3077 void Compile::check_no_dead_use() const {
3078 ResourceMark rm;
3079 Unique_Node_List wq;
3080 wq.push(root());
3081 for (uint i = 0; i < wq.size(); ++i) {
3082 Node* n = wq.at(i);
3083 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) {
3084 Node* u = n->fast_out(j);
3085 if (u->outcnt() == 0 && !u->is_Con()) {
3086 u->dump();
3087 fatal("no reachable node should have no use");
3088 }
3089 wq.push(u);
3090 }
3091 }
3092 }
3093 #endif
3094
3095 void Compile::inline_vector_reboxing_calls() {
3096 if (C->_vector_reboxing_late_inlines.length() > 0) {
3097 _late_inlines_pos = C->_late_inlines.length();
3098 while (_vector_reboxing_late_inlines.length() > 0) {
3099 CallGenerator* cg = _vector_reboxing_late_inlines.pop();
3100 cg->do_late_inline();
3101 if (failing()) return;
3102 print_method(PHASE_INLINE_VECTOR_REBOX, 3, cg->call_node());
3103 }
3104 _vector_reboxing_late_inlines.trunc_to(0);
3105 }
3106 }
3107
3108 bool Compile::has_vbox_nodes() {
3109 if (C->_vector_reboxing_late_inlines.length() > 0) {
3110 return true;
3111 }
3112 for (int macro_idx = C->macro_count() - 1; macro_idx >= 0; macro_idx--) {
3113 Node * n = C->macro_node(macro_idx);
3114 assert(n->is_macro(), "only macro nodes expected here");
3115 if (n->Opcode() == Op_VectorUnbox || n->Opcode() == Op_VectorBox || n->Opcode() == Op_VectorBoxAllocate) {
3116 return true;
3117 }
3118 }
3119 return false;
3120 }
3121
3122 //---------------------------- Bitwise operation packing optimization ---------------------------
3123
3124 static bool is_vector_unary_bitwise_op(Node* n) {
3125 return n->Opcode() == Op_XorV &&
3126 VectorNode::is_vector_bitwise_not_pattern(n);
3127 }
3128
3129 static bool is_vector_binary_bitwise_op(Node* n) {
3130 switch (n->Opcode()) {
3131 case Op_AndV:
3132 case Op_OrV:
3133 return true;
3134
3135 case Op_XorV:
3136 return !is_vector_unary_bitwise_op(n);
3137
3138 default:
3139 return false;
3140 }
3141 }
3142
3143 static bool is_vector_ternary_bitwise_op(Node* n) {
3144 return n->Opcode() == Op_MacroLogicV;
3145 }
3146
3147 static bool is_vector_bitwise_op(Node* n) {
3148 return is_vector_unary_bitwise_op(n) ||
3149 is_vector_binary_bitwise_op(n) ||
3150 is_vector_ternary_bitwise_op(n);
3151 }
3152
3153 static bool is_vector_bitwise_cone_root(Node* n) {
3154 if (n->bottom_type()->isa_vectmask() || !is_vector_bitwise_op(n)) {
3155 return false;
3156 }
3157 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
3158 if (is_vector_bitwise_op(n->fast_out(i))) {
3159 return false;
3160 }
3161 }
3162 return true;
3163 }
3164
3165 static uint collect_unique_inputs(Node* n, Unique_Node_List& inputs) {
3166 uint cnt = 0;
3167 if (is_vector_bitwise_op(n)) {
3168 uint inp_cnt = n->is_predicated_vector() ? n->req()-1 : n->req();
3169 if (VectorNode::is_vector_bitwise_not_pattern(n)) {
3170 for (uint i = 1; i < inp_cnt; i++) {
3171 Node* in = n->in(i);
3172 bool skip = VectorNode::is_all_ones_vector(in);
3173 if (!skip && !inputs.member(in)) {
3174 inputs.push(in);
3175 cnt++;
3176 }
3177 }
3178 assert(cnt <= 1, "not unary");
3179 } else {
3180 uint last_req = inp_cnt;
3181 if (is_vector_ternary_bitwise_op(n)) {
3182 last_req = inp_cnt - 1; // skip last input
3183 }
3184 for (uint i = 1; i < last_req; i++) {
3185 Node* def = n->in(i);
3186 if (!inputs.member(def)) {
3187 inputs.push(def);
3188 cnt++;
3189 }
3190 }
3191 }
3192 } else { // not a bitwise operations
3193 if (!inputs.member(n)) {
3194 inputs.push(n);
3195 cnt++;
3196 }
3197 }
3198 return cnt;
3199 }
3200
3201 void Compile::collect_logic_cone_roots(Unique_Node_List& list) {
3202 Unique_Node_List useful_nodes;
3203 C->identify_useful_nodes(useful_nodes);
3204
3205 for (uint i = 0; i < useful_nodes.size(); i++) {
3206 Node* n = useful_nodes.at(i);
3207 if (is_vector_bitwise_cone_root(n)) {
3208 list.push(n);
3209 }
3210 }
3211 }
3212
3213 Node* Compile::xform_to_MacroLogicV(PhaseIterGVN& igvn,
3214 const TypeVect* vt,
3215 Unique_Node_List& partition,
3216 Unique_Node_List& inputs) {
3217 assert(partition.size() == 2 || partition.size() == 3, "not supported");
3218 assert(inputs.size() == 2 || inputs.size() == 3, "not supported");
3219 assert(Matcher::match_rule_supported_vector(Op_MacroLogicV, vt->length(), vt->element_basic_type()), "not supported");
3220
3221 Node* in1 = inputs.at(0);
3222 Node* in2 = inputs.at(1);
3223 Node* in3 = (inputs.size() == 3 ? inputs.at(2) : in2);
3224
3225 uint func = compute_truth_table(partition, inputs);
3226
3227 Node* pn = partition.at(partition.size() - 1);
3228 Node* mask = pn->is_predicated_vector() ? pn->in(pn->req()-1) : nullptr;
3229 return igvn.transform(MacroLogicVNode::make(igvn, in1, in2, in3, mask, func, vt));
3230 }
3231
3232 static uint extract_bit(uint func, uint pos) {
3233 return (func & (1 << pos)) >> pos;
3234 }
3235
3236 //
3237 // A macro logic node represents a truth table. It has 4 inputs,
3238 // First three inputs corresponds to 3 columns of a truth table
3239 // and fourth input captures the logic function.
3240 //
3241 // eg. fn = (in1 AND in2) OR in3;
3242 //
3243 // MacroNode(in1,in2,in3,fn)
3244 //
3245 // -----------------
3246 // in1 in2 in3 fn
3247 // -----------------
3248 // 0 0 0 0
3249 // 0 0 1 1
3250 // 0 1 0 0
3251 // 0 1 1 1
3252 // 1 0 0 0
3253 // 1 0 1 1
3254 // 1 1 0 1
3255 // 1 1 1 1
3256 //
3257
3258 uint Compile::eval_macro_logic_op(uint func, uint in1 , uint in2, uint in3) {
3259 int res = 0;
3260 for (int i = 0; i < 8; i++) {
3261 int bit1 = extract_bit(in1, i);
3262 int bit2 = extract_bit(in2, i);
3263 int bit3 = extract_bit(in3, i);
3264
3265 int func_bit_pos = (bit1 << 2 | bit2 << 1 | bit3);
3266 int func_bit = extract_bit(func, func_bit_pos);
3267
3268 res |= func_bit << i;
3269 }
3270 return res;
3271 }
3272
3273 static uint eval_operand(Node* n, ResourceHashtable<Node*,uint>& eval_map) {
3274 assert(n != nullptr, "");
3275 assert(eval_map.contains(n), "absent");
3276 return *(eval_map.get(n));
3277 }
3278
3279 static void eval_operands(Node* n,
3280 uint& func1, uint& func2, uint& func3,
3281 ResourceHashtable<Node*,uint>& eval_map) {
3282 assert(is_vector_bitwise_op(n), "");
3283
3284 if (is_vector_unary_bitwise_op(n)) {
3285 Node* opnd = n->in(1);
3286 if (VectorNode::is_vector_bitwise_not_pattern(n) && VectorNode::is_all_ones_vector(opnd)) {
3287 opnd = n->in(2);
3288 }
3289 func1 = eval_operand(opnd, eval_map);
3290 } else if (is_vector_binary_bitwise_op(n)) {
3291 func1 = eval_operand(n->in(1), eval_map);
3292 func2 = eval_operand(n->in(2), eval_map);
3293 } else {
3294 assert(is_vector_ternary_bitwise_op(n), "unknown operation");
3295 func1 = eval_operand(n->in(1), eval_map);
3296 func2 = eval_operand(n->in(2), eval_map);
3297 func3 = eval_operand(n->in(3), eval_map);
3298 }
3299 }
3300
3301 uint Compile::compute_truth_table(Unique_Node_List& partition, Unique_Node_List& inputs) {
3302 assert(inputs.size() <= 3, "sanity");
3303 ResourceMark rm;
3304 uint res = 0;
3305 ResourceHashtable<Node*,uint> eval_map;
3306
3307 // Populate precomputed functions for inputs.
3308 // Each input corresponds to one column of 3 input truth-table.
3309 uint input_funcs[] = { 0xAA, // (_, _, c) -> c
3310 0xCC, // (_, b, _) -> b
3311 0xF0 }; // (a, _, _) -> a
3312 for (uint i = 0; i < inputs.size(); i++) {
3313 eval_map.put(inputs.at(i), input_funcs[2-i]);
3314 }
3315
3316 for (uint i = 0; i < partition.size(); i++) {
3317 Node* n = partition.at(i);
3318
3319 uint func1 = 0, func2 = 0, func3 = 0;
3320 eval_operands(n, func1, func2, func3, eval_map);
3321
3322 switch (n->Opcode()) {
3323 case Op_OrV:
3324 assert(func3 == 0, "not binary");
3325 res = func1 | func2;
3326 break;
3327 case Op_AndV:
3328 assert(func3 == 0, "not binary");
3329 res = func1 & func2;
3330 break;
3331 case Op_XorV:
3332 if (VectorNode::is_vector_bitwise_not_pattern(n)) {
3333 assert(func2 == 0 && func3 == 0, "not unary");
3334 res = (~func1) & 0xFF;
3335 } else {
3336 assert(func3 == 0, "not binary");
3337 res = func1 ^ func2;
3338 }
3339 break;
3340 case Op_MacroLogicV:
3341 // Ordering of inputs may change during evaluation of sub-tree
3342 // containing MacroLogic node as a child node, thus a re-evaluation
3343 // makes sure that function is evaluated in context of current
3344 // inputs.
3345 res = eval_macro_logic_op(n->in(4)->get_int(), func1, func2, func3);
3346 break;
3347
3348 default: assert(false, "not supported: %s", n->Name());
3349 }
3350 assert(res <= 0xFF, "invalid");
3351 eval_map.put(n, res);
3352 }
3353 return res;
3354 }
3355
3356 // Criteria under which nodes gets packed into a macro logic node:-
3357 // 1) Parent and both child nodes are all unmasked or masked with
3358 // same predicates.
3359 // 2) Masked parent can be packed with left child if it is predicated
3360 // and both have same predicates.
3361 // 3) Masked parent can be packed with right child if its un-predicated
3362 // or has matching predication condition.
3363 // 4) An unmasked parent can be packed with an unmasked child.
3364 bool Compile::compute_logic_cone(Node* n, Unique_Node_List& partition, Unique_Node_List& inputs) {
3365 assert(partition.size() == 0, "not empty");
3366 assert(inputs.size() == 0, "not empty");
3367 if (is_vector_ternary_bitwise_op(n)) {
3368 return false;
3369 }
3370
3371 bool is_unary_op = is_vector_unary_bitwise_op(n);
3372 if (is_unary_op) {
3373 assert(collect_unique_inputs(n, inputs) == 1, "not unary");
3374 return false; // too few inputs
3375 }
3376
3377 bool pack_left_child = true;
3378 bool pack_right_child = true;
3379
3380 bool left_child_LOP = is_vector_bitwise_op(n->in(1));
3381 bool right_child_LOP = is_vector_bitwise_op(n->in(2));
3382
3383 int left_child_input_cnt = 0;
3384 int right_child_input_cnt = 0;
3385
3386 bool parent_is_predicated = n->is_predicated_vector();
3387 bool left_child_predicated = n->in(1)->is_predicated_vector();
3388 bool right_child_predicated = n->in(2)->is_predicated_vector();
3389
3390 Node* parent_pred = parent_is_predicated ? n->in(n->req()-1) : nullptr;
3391 Node* left_child_pred = left_child_predicated ? n->in(1)->in(n->in(1)->req()-1) : nullptr;
3392 Node* right_child_pred = right_child_predicated ? n->in(1)->in(n->in(1)->req()-1) : nullptr;
3393
3394 do {
3395 if (pack_left_child && left_child_LOP &&
3396 ((!parent_is_predicated && !left_child_predicated) ||
3397 ((parent_is_predicated && left_child_predicated &&
3398 parent_pred == left_child_pred)))) {
3399 partition.push(n->in(1));
3400 left_child_input_cnt = collect_unique_inputs(n->in(1), inputs);
3401 } else {
3402 inputs.push(n->in(1));
3403 left_child_input_cnt = 1;
3404 }
3405
3406 if (pack_right_child && right_child_LOP &&
3407 (!right_child_predicated ||
3408 (right_child_predicated && parent_is_predicated &&
3409 parent_pred == right_child_pred))) {
3410 partition.push(n->in(2));
3411 right_child_input_cnt = collect_unique_inputs(n->in(2), inputs);
3412 } else {
3413 inputs.push(n->in(2));
3414 right_child_input_cnt = 1;
3415 }
3416
3417 if (inputs.size() > 3) {
3418 assert(partition.size() > 0, "");
3419 inputs.clear();
3420 partition.clear();
3421 if (left_child_input_cnt > right_child_input_cnt) {
3422 pack_left_child = false;
3423 } else {
3424 pack_right_child = false;
3425 }
3426 } else {
3427 break;
3428 }
3429 } while(true);
3430
3431 if(partition.size()) {
3432 partition.push(n);
3433 }
3434
3435 return (partition.size() == 2 || partition.size() == 3) &&
3436 (inputs.size() == 2 || inputs.size() == 3);
3437 }
3438
3439 void Compile::process_logic_cone_root(PhaseIterGVN &igvn, Node *n, VectorSet &visited) {
3440 assert(is_vector_bitwise_op(n), "not a root");
3441
3442 visited.set(n->_idx);
3443
3444 // 1) Do a DFS walk over the logic cone.
3445 for (uint i = 1; i < n->req(); i++) {
3446 Node* in = n->in(i);
3447 if (!visited.test(in->_idx) && is_vector_bitwise_op(in)) {
3448 process_logic_cone_root(igvn, in, visited);
3449 }
3450 }
3451
3452 // 2) Bottom up traversal: Merge node[s] with
3453 // the parent to form macro logic node.
3454 Unique_Node_List partition;
3455 Unique_Node_List inputs;
3456 if (compute_logic_cone(n, partition, inputs)) {
3457 const TypeVect* vt = n->bottom_type()->is_vect();
3458 Node* pn = partition.at(partition.size() - 1);
3459 Node* mask = pn->is_predicated_vector() ? pn->in(pn->req()-1) : nullptr;
3460 if (mask == nullptr ||
3461 Matcher::match_rule_supported_vector_masked(Op_MacroLogicV, vt->length(), vt->element_basic_type())) {
3462 Node* macro_logic = xform_to_MacroLogicV(igvn, vt, partition, inputs);
3463 VectorNode::trace_new_vector(macro_logic, "MacroLogic");
3464 igvn.replace_node(n, macro_logic);
3465 }
3466 }
3467 }
3468
3469 void Compile::optimize_logic_cones(PhaseIterGVN &igvn) {
3470 ResourceMark rm;
3471 if (Matcher::match_rule_supported(Op_MacroLogicV)) {
3472 Unique_Node_List list;
3473 collect_logic_cone_roots(list);
3474
3475 while (list.size() > 0) {
3476 Node* n = list.pop();
3477 const TypeVect* vt = n->bottom_type()->is_vect();
3478 bool supported = Matcher::match_rule_supported_vector(Op_MacroLogicV, vt->length(), vt->element_basic_type());
3479 if (supported) {
3480 VectorSet visited(comp_arena());
3481 process_logic_cone_root(igvn, n, visited);
3482 }
3483 }
3484 }
3485 }
3486
3487 //------------------------------Code_Gen---------------------------------------
3488 // Given a graph, generate code for it
3489 void Compile::Code_Gen() {
3490 if (failing()) {
3491 return;
3492 }
3493
3494 // Perform instruction selection. You might think we could reclaim Matcher
3495 // memory PDQ, but actually the Matcher is used in generating spill code.
3496 // Internals of the Matcher (including some VectorSets) must remain live
3497 // for awhile - thus I cannot reclaim Matcher memory lest a VectorSet usage
3498 // set a bit in reclaimed memory.
3499
3500 // In debug mode can dump m._nodes.dump() for mapping of ideal to machine
3501 // nodes. Mapping is only valid at the root of each matched subtree.
3502 NOT_PRODUCT( verify_graph_edges(); )
3503
3504 Matcher matcher;
3505 _matcher = &matcher;
3506 {
3507 TracePhase tp(_t_matcher);
3508 matcher.match();
3509 if (failing()) {
3510 return;
3511 }
3512 }
3513 // In debug mode can dump m._nodes.dump() for mapping of ideal to machine
3514 // nodes. Mapping is only valid at the root of each matched subtree.
3515 NOT_PRODUCT( verify_graph_edges(); )
3516
3517 // If you have too many nodes, or if matching has failed, bail out
3518 check_node_count(0, "out of nodes matching instructions");
3519 if (failing()) {
3520 return;
3521 }
3522
3523 print_method(PHASE_MATCHING, 2);
3524
3525 // Build a proper-looking CFG
3526 PhaseCFG cfg(node_arena(), root(), matcher);
3527 if (failing()) {
3528 return;
3529 }
3530 _cfg = &cfg;
3531 {
3532 TracePhase tp(_t_scheduler);
3533 bool success = cfg.do_global_code_motion();
3534 if (!success) {
3535 return;
3536 }
3537
3538 print_method(PHASE_GLOBAL_CODE_MOTION, 2);
3539 NOT_PRODUCT( verify_graph_edges(); )
3540 cfg.verify();
3541 if (failing()) {
3542 return;
3543 }
3544 }
3545
3546 PhaseChaitin regalloc(unique(), cfg, matcher, false);
3547 _regalloc = ®alloc;
3548 {
3549 TracePhase tp(_t_registerAllocation);
3550 // Perform register allocation. After Chaitin, use-def chains are
3551 // no longer accurate (at spill code) and so must be ignored.
3552 // Node->LRG->reg mappings are still accurate.
3553 _regalloc->Register_Allocate();
3554
3555 // Bail out if the allocator builds too many nodes
3556 if (failing()) {
3557 return;
3558 }
3559
3560 print_method(PHASE_REGISTER_ALLOCATION, 2);
3561 }
3562
3563 // Prior to register allocation we kept empty basic blocks in case the
3564 // the allocator needed a place to spill. After register allocation we
3565 // are not adding any new instructions. If any basic block is empty, we
3566 // can now safely remove it.
3567 {
3568 TracePhase tp(_t_blockOrdering);
3569 cfg.remove_empty_blocks();
3570 if (do_freq_based_layout()) {
3571 PhaseBlockLayout layout(cfg);
3572 } else {
3573 cfg.set_loop_alignment();
3574 }
3575 cfg.fixup_flow();
3576 cfg.remove_unreachable_blocks();
3577 cfg.verify_dominator_tree();
3578 print_method(PHASE_BLOCK_ORDERING, 3);
3579 }
3580
3581 // Apply peephole optimizations
3582 if( OptoPeephole ) {
3583 TracePhase tp(_t_peephole);
3584 PhasePeephole peep( _regalloc, cfg);
3585 peep.do_transform();
3586 print_method(PHASE_PEEPHOLE, 3);
3587 }
3588
3589 // Do late expand if CPU requires this.
3590 if (Matcher::require_postalloc_expand) {
3591 TracePhase tp(_t_postalloc_expand);
3592 cfg.postalloc_expand(_regalloc);
3593 print_method(PHASE_POSTALLOC_EXPAND, 3);
3594 }
3595
3596 #ifdef ASSERT
3597 {
3598 CompilationMemoryStatistic::do_test_allocations();
3599 if (failing()) return;
3600 }
3601 #endif
3602
3603 // Convert Nodes to instruction bits in a buffer
3604 {
3605 TracePhase tp(_t_output);
3606 PhaseOutput output;
3607 output.Output();
3608 if (failing()) return;
3609 output.install();
3610 print_method(PHASE_FINAL_CODE, 1); // Compile::_output is not null here
3611 }
3612
3613 // He's dead, Jim.
3614 _cfg = (PhaseCFG*)((intptr_t)0xdeadbeef);
3615 _regalloc = (PhaseChaitin*)((intptr_t)0xdeadbeef);
3616 }
3617
3618 //------------------------------Final_Reshape_Counts---------------------------
3619 // This class defines counters to help identify when a method
3620 // may/must be executed using hardware with only 24-bit precision.
3621 struct Final_Reshape_Counts : public StackObj {
3622 int _call_count; // count non-inlined 'common' calls
3623 int _float_count; // count float ops requiring 24-bit precision
3624 int _double_count; // count double ops requiring more precision
3625 int _java_call_count; // count non-inlined 'java' calls
3626 int _inner_loop_count; // count loops which need alignment
3627 VectorSet _visited; // Visitation flags
3628 Node_List _tests; // Set of IfNodes & PCTableNodes
3629
3630 Final_Reshape_Counts() :
3631 _call_count(0), _float_count(0), _double_count(0),
3632 _java_call_count(0), _inner_loop_count(0) { }
3633
3634 void inc_call_count () { _call_count ++; }
3635 void inc_float_count () { _float_count ++; }
3636 void inc_double_count() { _double_count++; }
3637 void inc_java_call_count() { _java_call_count++; }
3638 void inc_inner_loop_count() { _inner_loop_count++; }
3639
3640 int get_call_count () const { return _call_count ; }
3641 int get_float_count () const { return _float_count ; }
3642 int get_double_count() const { return _double_count; }
3643 int get_java_call_count() const { return _java_call_count; }
3644 int get_inner_loop_count() const { return _inner_loop_count; }
3645 };
3646
3647 //------------------------------final_graph_reshaping_impl----------------------
3648 // Implement items 1-5 from final_graph_reshaping below.
3649 void Compile::final_graph_reshaping_impl(Node *n, Final_Reshape_Counts& frc, Unique_Node_List& dead_nodes) {
3650
3651 if ( n->outcnt() == 0 ) return; // dead node
3652 uint nop = n->Opcode();
3653
3654 // Check for 2-input instruction with "last use" on right input.
3655 // Swap to left input. Implements item (2).
3656 if( n->req() == 3 && // two-input instruction
3657 n->in(1)->outcnt() > 1 && // left use is NOT a last use
3658 (!n->in(1)->is_Phi() || n->in(1)->in(2) != n) && // it is not data loop
3659 n->in(2)->outcnt() == 1 &&// right use IS a last use
3660 !n->in(2)->is_Con() ) { // right use is not a constant
3661 // Check for commutative opcode
3662 switch( nop ) {
3663 case Op_AddI: case Op_AddF: case Op_AddD: case Op_AddL:
3664 case Op_MaxI: case Op_MaxL: case Op_MaxF: case Op_MaxD:
3665 case Op_MinI: case Op_MinL: case Op_MinF: case Op_MinD:
3666 case Op_MulI: case Op_MulF: case Op_MulD: case Op_MulL:
3667 case Op_AndL: case Op_XorL: case Op_OrL:
3668 case Op_AndI: case Op_XorI: case Op_OrI: {
3669 // Move "last use" input to left by swapping inputs
3670 n->swap_edges(1, 2);
3671 break;
3672 }
3673 default:
3674 break;
3675 }
3676 }
3677
3678 #ifdef ASSERT
3679 if( n->is_Mem() ) {
3680 int alias_idx = get_alias_index(n->as_Mem()->adr_type());
3681 assert( n->in(0) != nullptr || alias_idx != Compile::AliasIdxRaw ||
3682 // oop will be recorded in oop map if load crosses safepoint
3683 (n->is_Load() && (n->as_Load()->bottom_type()->isa_oopptr() ||
3684 LoadNode::is_immutable_value(n->in(MemNode::Address)))),
3685 "raw memory operations should have control edge");
3686 }
3687 if (n->is_MemBar()) {
3688 MemBarNode* mb = n->as_MemBar();
3689 if (mb->trailing_store() || mb->trailing_load_store()) {
3690 assert(mb->leading_membar()->trailing_membar() == mb, "bad membar pair");
3691 Node* mem = BarrierSet::barrier_set()->barrier_set_c2()->step_over_gc_barrier(mb->in(MemBarNode::Precedent));
3692 assert((mb->trailing_store() && mem->is_Store() && mem->as_Store()->is_release()) ||
3693 (mb->trailing_load_store() && mem->is_LoadStore()), "missing mem op");
3694 } else if (mb->leading()) {
3695 assert(mb->trailing_membar()->leading_membar() == mb, "bad membar pair");
3696 }
3697 }
3698 #endif
3699 // Count FPU ops and common calls, implements item (3)
3700 bool gc_handled = BarrierSet::barrier_set()->barrier_set_c2()->final_graph_reshaping(this, n, nop, dead_nodes);
3701 if (!gc_handled) {
3702 final_graph_reshaping_main_switch(n, frc, nop, dead_nodes);
3703 }
3704
3705 // Collect CFG split points
3706 if (n->is_MultiBranch() && !n->is_RangeCheck()) {
3707 frc._tests.push(n);
3708 }
3709 }
3710
3711 void Compile::handle_div_mod_op(Node* n, BasicType bt, bool is_unsigned) {
3712 if (!UseDivMod) {
3713 return;
3714 }
3715
3716 // Check if "a % b" and "a / b" both exist
3717 Node* d = n->find_similar(Op_DivIL(bt, is_unsigned));
3718 if (d == nullptr) {
3719 return;
3720 }
3721
3722 // Replace them with a fused divmod if supported
3723 if (Matcher::has_match_rule(Op_DivModIL(bt, is_unsigned))) {
3724 DivModNode* divmod = DivModNode::make(n, bt, is_unsigned);
3725 // If the divisor input for a Div (or Mod etc.) is not zero, then the control input of the Div is set to zero.
3726 // It could be that the divisor input is found not zero because its type is narrowed down by a CastII in the
3727 // subgraph for that input. Range check CastIIs are removed during final graph reshape. To preserve the dependency
3728 // carried by a CastII, precedence edges are added to the Div node. We need to transfer the precedence edges to the
3729 // DivMod node so the dependency is not lost.
3730 divmod->add_prec_from(n);
3731 divmod->add_prec_from(d);
3732 d->subsume_by(divmod->div_proj(), this);
3733 n->subsume_by(divmod->mod_proj(), this);
3734 } else {
3735 // Replace "a % b" with "a - ((a / b) * b)"
3736 Node* mult = MulNode::make(d, d->in(2), bt);
3737 Node* sub = SubNode::make(d->in(1), mult, bt);
3738 n->subsume_by(sub, this);
3739 }
3740 }
3741
3742 void Compile::final_graph_reshaping_main_switch(Node* n, Final_Reshape_Counts& frc, uint nop, Unique_Node_List& dead_nodes) {
3743 switch( nop ) {
3744 // Count all float operations that may use FPU
3745 case Op_AddF:
3746 case Op_SubF:
3747 case Op_MulF:
3748 case Op_DivF:
3749 case Op_NegF:
3750 case Op_ModF:
3751 case Op_ConvI2F:
3752 case Op_ConF:
3753 case Op_CmpF:
3754 case Op_CmpF3:
3755 case Op_StoreF:
3756 case Op_LoadF:
3757 // case Op_ConvL2F: // longs are split into 32-bit halves
3758 frc.inc_float_count();
3759 break;
3760
3761 case Op_ConvF2D:
3762 case Op_ConvD2F:
3763 frc.inc_float_count();
3764 frc.inc_double_count();
3765 break;
3766
3767 // Count all double operations that may use FPU
3768 case Op_AddD:
3769 case Op_SubD:
3770 case Op_MulD:
3771 case Op_DivD:
3772 case Op_NegD:
3773 case Op_ModD:
3774 case Op_ConvI2D:
3775 case Op_ConvD2I:
3776 // case Op_ConvL2D: // handled by leaf call
3777 // case Op_ConvD2L: // handled by leaf call
3778 case Op_ConD:
3779 case Op_CmpD:
3780 case Op_CmpD3:
3781 case Op_StoreD:
3782 case Op_LoadD:
3783 case Op_LoadD_unaligned:
3784 frc.inc_double_count();
3785 break;
3786 case Op_Opaque1: // Remove Opaque Nodes before matching
3787 n->subsume_by(n->in(1), this);
3788 break;
3789 case Op_CallStaticJava:
3790 case Op_CallJava:
3791 case Op_CallDynamicJava:
3792 frc.inc_java_call_count(); // Count java call site;
3793 case Op_CallRuntime:
3794 case Op_CallLeaf:
3795 case Op_CallLeafVector:
3796 case Op_CallLeafNoFP: {
3797 assert (n->is_Call(), "");
3798 CallNode *call = n->as_Call();
3799 // Count call sites where the FP mode bit would have to be flipped.
3800 // Do not count uncommon runtime calls:
3801 // uncommon_trap, _complete_monitor_locking, _complete_monitor_unlocking,
3802 // _new_Java, _new_typeArray, _new_objArray, _rethrow_Java, ...
3803 if (!call->is_CallStaticJava() || !call->as_CallStaticJava()->_name) {
3804 frc.inc_call_count(); // Count the call site
3805 } else { // See if uncommon argument is shared
3806 Node *n = call->in(TypeFunc::Parms);
3807 int nop = n->Opcode();
3808 // Clone shared simple arguments to uncommon calls, item (1).
3809 if (n->outcnt() > 1 &&
3810 !n->is_Proj() &&
3811 nop != Op_CreateEx &&
3812 nop != Op_CheckCastPP &&
3813 nop != Op_DecodeN &&
3814 nop != Op_DecodeNKlass &&
3815 !n->is_Mem() &&
3816 !n->is_Phi()) {
3817 Node *x = n->clone();
3818 call->set_req(TypeFunc::Parms, x);
3819 }
3820 }
3821 break;
3822 }
3823 case Op_StoreB:
3824 case Op_StoreC:
3825 case Op_StoreI:
3826 case Op_StoreL:
3827 case Op_StoreLSpecial:
3828 case Op_CompareAndSwapB:
3829 case Op_CompareAndSwapS:
3830 case Op_CompareAndSwapI:
3831 case Op_CompareAndSwapL:
3832 case Op_CompareAndSwapP:
3833 case Op_CompareAndSwapN:
3834 case Op_WeakCompareAndSwapB:
3835 case Op_WeakCompareAndSwapS:
3836 case Op_WeakCompareAndSwapI:
3837 case Op_WeakCompareAndSwapL:
3838 case Op_WeakCompareAndSwapP:
3839 case Op_WeakCompareAndSwapN:
3840 case Op_CompareAndExchangeB:
3841 case Op_CompareAndExchangeS:
3842 case Op_CompareAndExchangeI:
3843 case Op_CompareAndExchangeL:
3844 case Op_CompareAndExchangeP:
3845 case Op_CompareAndExchangeN:
3846 case Op_GetAndAddS:
3847 case Op_GetAndAddB:
3848 case Op_GetAndAddI:
3849 case Op_GetAndAddL:
3850 case Op_GetAndSetS:
3851 case Op_GetAndSetB:
3852 case Op_GetAndSetI:
3853 case Op_GetAndSetL:
3854 case Op_GetAndSetP:
3855 case Op_GetAndSetN:
3856 case Op_StoreP:
3857 case Op_StoreN:
3858 case Op_StoreNKlass:
3859 case Op_LoadB:
3860 case Op_LoadUB:
3861 case Op_LoadUS:
3862 case Op_LoadI:
3863 case Op_LoadKlass:
3864 case Op_LoadNKlass:
3865 case Op_LoadL:
3866 case Op_LoadL_unaligned:
3867 case Op_LoadP:
3868 case Op_LoadN:
3869 case Op_LoadRange:
3870 case Op_LoadS:
3871 break;
3872
3873 case Op_AddP: { // Assert sane base pointers
3874 Node *addp = n->in(AddPNode::Address);
3875 assert( !addp->is_AddP() ||
3876 addp->in(AddPNode::Base)->is_top() || // Top OK for allocation
3877 addp->in(AddPNode::Base) == n->in(AddPNode::Base),
3878 "Base pointers must match (addp %u)", addp->_idx );
3879 #ifdef _LP64
3880 if ((UseCompressedOops || UseCompressedClassPointers) &&
3881 addp->Opcode() == Op_ConP &&
3882 addp == n->in(AddPNode::Base) &&
3883 n->in(AddPNode::Offset)->is_Con()) {
3884 // If the transformation of ConP to ConN+DecodeN is beneficial depends
3885 // on the platform and on the compressed oops mode.
3886 // Use addressing with narrow klass to load with offset on x86.
3887 // Some platforms can use the constant pool to load ConP.
3888 // Do this transformation here since IGVN will convert ConN back to ConP.
3889 const Type* t = addp->bottom_type();
3890 bool is_oop = t->isa_oopptr() != nullptr;
3891 bool is_klass = t->isa_klassptr() != nullptr;
3892
3893 if ((is_oop && UseCompressedOops && Matcher::const_oop_prefer_decode() ) ||
3894 (is_klass && UseCompressedClassPointers && Matcher::const_klass_prefer_decode() &&
3895 t->isa_klassptr()->exact_klass()->is_in_encoding_range())) {
3896 Node* nn = nullptr;
3897
3898 int op = is_oop ? Op_ConN : Op_ConNKlass;
3899
3900 // Look for existing ConN node of the same exact type.
3901 Node* r = root();
3902 uint cnt = r->outcnt();
3903 for (uint i = 0; i < cnt; i++) {
3904 Node* m = r->raw_out(i);
3905 if (m!= nullptr && m->Opcode() == op &&
3906 m->bottom_type()->make_ptr() == t) {
3907 nn = m;
3908 break;
3909 }
3910 }
3911 if (nn != nullptr) {
3912 // Decode a narrow oop to match address
3913 // [R12 + narrow_oop_reg<<3 + offset]
3914 if (is_oop) {
3915 nn = new DecodeNNode(nn, t);
3916 } else {
3917 nn = new DecodeNKlassNode(nn, t);
3918 }
3919 // Check for succeeding AddP which uses the same Base.
3920 // Otherwise we will run into the assertion above when visiting that guy.
3921 for (uint i = 0; i < n->outcnt(); ++i) {
3922 Node *out_i = n->raw_out(i);
3923 if (out_i && out_i->is_AddP() && out_i->in(AddPNode::Base) == addp) {
3924 out_i->set_req(AddPNode::Base, nn);
3925 #ifdef ASSERT
3926 for (uint j = 0; j < out_i->outcnt(); ++j) {
3927 Node *out_j = out_i->raw_out(j);
3928 assert(out_j == nullptr || !out_j->is_AddP() || out_j->in(AddPNode::Base) != addp,
3929 "more than 2 AddP nodes in a chain (out_j %u)", out_j->_idx);
3930 }
3931 #endif
3932 }
3933 }
3934 n->set_req(AddPNode::Base, nn);
3935 n->set_req(AddPNode::Address, nn);
3936 if (addp->outcnt() == 0) {
3937 addp->disconnect_inputs(this);
3938 }
3939 }
3940 }
3941 }
3942 #endif
3943 break;
3944 }
3945
3946 case Op_CastPP: {
3947 // Remove CastPP nodes to gain more freedom during scheduling but
3948 // keep the dependency they encode as control or precedence edges
3949 // (if control is set already) on memory operations. Some CastPP
3950 // nodes don't have a control (don't carry a dependency): skip
3951 // those.
3952 if (n->in(0) != nullptr) {
3953 ResourceMark rm;
3954 Unique_Node_List wq;
3955 wq.push(n);
3956 for (uint next = 0; next < wq.size(); ++next) {
3957 Node *m = wq.at(next);
3958 for (DUIterator_Fast imax, i = m->fast_outs(imax); i < imax; i++) {
3959 Node* use = m->fast_out(i);
3960 if (use->is_Mem() || use->is_EncodeNarrowPtr()) {
3961 use->ensure_control_or_add_prec(n->in(0));
3962 } else {
3963 switch(use->Opcode()) {
3964 case Op_AddP:
3965 case Op_DecodeN:
3966 case Op_DecodeNKlass:
3967 case Op_CheckCastPP:
3968 case Op_CastPP:
3969 wq.push(use);
3970 break;
3971 }
3972 }
3973 }
3974 }
3975 }
3976 const bool is_LP64 = LP64_ONLY(true) NOT_LP64(false);
3977 if (is_LP64 && n->in(1)->is_DecodeN() && Matcher::gen_narrow_oop_implicit_null_checks()) {
3978 Node* in1 = n->in(1);
3979 const Type* t = n->bottom_type();
3980 Node* new_in1 = in1->clone();
3981 new_in1->as_DecodeN()->set_type(t);
3982
3983 if (!Matcher::narrow_oop_use_complex_address()) {
3984 //
3985 // x86, ARM and friends can handle 2 adds in addressing mode
3986 // and Matcher can fold a DecodeN node into address by using
3987 // a narrow oop directly and do implicit null check in address:
3988 //
3989 // [R12 + narrow_oop_reg<<3 + offset]
3990 // NullCheck narrow_oop_reg
3991 //
3992 // On other platforms (Sparc) we have to keep new DecodeN node and
3993 // use it to do implicit null check in address:
3994 //
3995 // decode_not_null narrow_oop_reg, base_reg
3996 // [base_reg + offset]
3997 // NullCheck base_reg
3998 //
3999 // Pin the new DecodeN node to non-null path on these platform (Sparc)
4000 // to keep the information to which null check the new DecodeN node
4001 // corresponds to use it as value in implicit_null_check().
4002 //
4003 new_in1->set_req(0, n->in(0));
4004 }
4005
4006 n->subsume_by(new_in1, this);
4007 if (in1->outcnt() == 0) {
4008 in1->disconnect_inputs(this);
4009 }
4010 } else {
4011 n->subsume_by(n->in(1), this);
4012 if (n->outcnt() == 0) {
4013 n->disconnect_inputs(this);
4014 }
4015 }
4016 break;
4017 }
4018 case Op_CastII: {
4019 n->as_CastII()->remove_range_check_cast(this);
4020 break;
4021 }
4022 #ifdef _LP64
4023 case Op_CmpP:
4024 // Do this transformation here to preserve CmpPNode::sub() and
4025 // other TypePtr related Ideal optimizations (for example, ptr nullness).
4026 if (n->in(1)->is_DecodeNarrowPtr() || n->in(2)->is_DecodeNarrowPtr()) {
4027 Node* in1 = n->in(1);
4028 Node* in2 = n->in(2);
4029 if (!in1->is_DecodeNarrowPtr()) {
4030 in2 = in1;
4031 in1 = n->in(2);
4032 }
4033 assert(in1->is_DecodeNarrowPtr(), "sanity");
4034
4035 Node* new_in2 = nullptr;
4036 if (in2->is_DecodeNarrowPtr()) {
4037 assert(in2->Opcode() == in1->Opcode(), "must be same node type");
4038 new_in2 = in2->in(1);
4039 } else if (in2->Opcode() == Op_ConP) {
4040 const Type* t = in2->bottom_type();
4041 if (t == TypePtr::NULL_PTR) {
4042 assert(in1->is_DecodeN(), "compare klass to null?");
4043 // Don't convert CmpP null check into CmpN if compressed
4044 // oops implicit null check is not generated.
4045 // This will allow to generate normal oop implicit null check.
4046 if (Matcher::gen_narrow_oop_implicit_null_checks())
4047 new_in2 = ConNode::make(TypeNarrowOop::NULL_PTR);
4048 //
4049 // This transformation together with CastPP transformation above
4050 // will generated code for implicit null checks for compressed oops.
4051 //
4052 // The original code after Optimize()
4053 //
4054 // LoadN memory, narrow_oop_reg
4055 // decode narrow_oop_reg, base_reg
4056 // CmpP base_reg, nullptr
4057 // CastPP base_reg // NotNull
4058 // Load [base_reg + offset], val_reg
4059 //
4060 // after these transformations will be
4061 //
4062 // LoadN memory, narrow_oop_reg
4063 // CmpN narrow_oop_reg, nullptr
4064 // decode_not_null narrow_oop_reg, base_reg
4065 // Load [base_reg + offset], val_reg
4066 //
4067 // and the uncommon path (== nullptr) will use narrow_oop_reg directly
4068 // since narrow oops can be used in debug info now (see the code in
4069 // final_graph_reshaping_walk()).
4070 //
4071 // At the end the code will be matched to
4072 // on x86:
4073 //
4074 // Load_narrow_oop memory, narrow_oop_reg
4075 // Load [R12 + narrow_oop_reg<<3 + offset], val_reg
4076 // NullCheck narrow_oop_reg
4077 //
4078 // and on sparc:
4079 //
4080 // Load_narrow_oop memory, narrow_oop_reg
4081 // decode_not_null narrow_oop_reg, base_reg
4082 // Load [base_reg + offset], val_reg
4083 // NullCheck base_reg
4084 //
4085 } else if (t->isa_oopptr()) {
4086 new_in2 = ConNode::make(t->make_narrowoop());
4087 } else if (t->isa_klassptr()) {
4088 new_in2 = ConNode::make(t->make_narrowklass());
4089 }
4090 }
4091 if (new_in2 != nullptr) {
4092 Node* cmpN = new CmpNNode(in1->in(1), new_in2);
4093 n->subsume_by(cmpN, this);
4094 if (in1->outcnt() == 0) {
4095 in1->disconnect_inputs(this);
4096 }
4097 if (in2->outcnt() == 0) {
4098 in2->disconnect_inputs(this);
4099 }
4100 }
4101 }
4102 break;
4103
4104 case Op_DecodeN:
4105 case Op_DecodeNKlass:
4106 assert(!n->in(1)->is_EncodeNarrowPtr(), "should be optimized out");
4107 // DecodeN could be pinned when it can't be fold into
4108 // an address expression, see the code for Op_CastPP above.
4109 assert(n->in(0) == nullptr || (UseCompressedOops && !Matcher::narrow_oop_use_complex_address()), "no control");
4110 break;
4111
4112 case Op_EncodeP:
4113 case Op_EncodePKlass: {
4114 Node* in1 = n->in(1);
4115 if (in1->is_DecodeNarrowPtr()) {
4116 n->subsume_by(in1->in(1), this);
4117 } else if (in1->Opcode() == Op_ConP) {
4118 const Type* t = in1->bottom_type();
4119 if (t == TypePtr::NULL_PTR) {
4120 assert(t->isa_oopptr(), "null klass?");
4121 n->subsume_by(ConNode::make(TypeNarrowOop::NULL_PTR), this);
4122 } else if (t->isa_oopptr()) {
4123 n->subsume_by(ConNode::make(t->make_narrowoop()), this);
4124 } else if (t->isa_klassptr()) {
4125 n->subsume_by(ConNode::make(t->make_narrowklass()), this);
4126 }
4127 }
4128 if (in1->outcnt() == 0) {
4129 in1->disconnect_inputs(this);
4130 }
4131 break;
4132 }
4133
4134 case Op_Proj: {
4135 if (OptimizeStringConcat || IncrementalInline) {
4136 ProjNode* proj = n->as_Proj();
4137 if (proj->_is_io_use) {
4138 assert(proj->_con == TypeFunc::I_O || proj->_con == TypeFunc::Memory, "");
4139 // Separate projections were used for the exception path which
4140 // are normally removed by a late inline. If it wasn't inlined
4141 // then they will hang around and should just be replaced with
4142 // the original one. Merge them.
4143 Node* non_io_proj = proj->in(0)->as_Multi()->proj_out_or_null(proj->_con, false /*is_io_use*/);
4144 if (non_io_proj != nullptr) {
4145 proj->subsume_by(non_io_proj , this);
4146 }
4147 }
4148 }
4149 break;
4150 }
4151
4152 case Op_Phi:
4153 if (n->as_Phi()->bottom_type()->isa_narrowoop() || n->as_Phi()->bottom_type()->isa_narrowklass()) {
4154 // The EncodeP optimization may create Phi with the same edges
4155 // for all paths. It is not handled well by Register Allocator.
4156 Node* unique_in = n->in(1);
4157 assert(unique_in != nullptr, "");
4158 uint cnt = n->req();
4159 for (uint i = 2; i < cnt; i++) {
4160 Node* m = n->in(i);
4161 assert(m != nullptr, "");
4162 if (unique_in != m)
4163 unique_in = nullptr;
4164 }
4165 if (unique_in != nullptr) {
4166 n->subsume_by(unique_in, this);
4167 }
4168 }
4169 break;
4170
4171 #endif
4172
4173 case Op_ModI:
4174 handle_div_mod_op(n, T_INT, false);
4175 break;
4176
4177 case Op_ModL:
4178 handle_div_mod_op(n, T_LONG, false);
4179 break;
4180
4181 case Op_UModI:
4182 handle_div_mod_op(n, T_INT, true);
4183 break;
4184
4185 case Op_UModL:
4186 handle_div_mod_op(n, T_LONG, true);
4187 break;
4188
4189 case Op_LoadVector:
4190 case Op_StoreVector:
4191 #ifdef ASSERT
4192 // Add VerifyVectorAlignment node between adr and load / store.
4193 if (VerifyAlignVector && Matcher::has_match_rule(Op_VerifyVectorAlignment)) {
4194 bool must_verify_alignment = n->is_LoadVector() ? n->as_LoadVector()->must_verify_alignment() :
4195 n->as_StoreVector()->must_verify_alignment();
4196 if (must_verify_alignment) {
4197 jlong vector_width = n->is_LoadVector() ? n->as_LoadVector()->memory_size() :
4198 n->as_StoreVector()->memory_size();
4199 // The memory access should be aligned to the vector width in bytes.
4200 // However, the underlying array is possibly less well aligned, but at least
4201 // to ObjectAlignmentInBytes. Hence, even if multiple arrays are accessed in
4202 // a loop we can expect at least the following alignment:
4203 jlong guaranteed_alignment = MIN2(vector_width, (jlong)ObjectAlignmentInBytes);
4204 assert(2 <= guaranteed_alignment && guaranteed_alignment <= 64, "alignment must be in range");
4205 assert(is_power_of_2(guaranteed_alignment), "alignment must be power of 2");
4206 // Create mask from alignment. e.g. 0b1000 -> 0b0111
4207 jlong mask = guaranteed_alignment - 1;
4208 Node* mask_con = ConLNode::make(mask);
4209 VerifyVectorAlignmentNode* va = new VerifyVectorAlignmentNode(n->in(MemNode::Address), mask_con);
4210 n->set_req(MemNode::Address, va);
4211 }
4212 }
4213 #endif
4214 break;
4215
4216 case Op_LoadVectorGather:
4217 case Op_StoreVectorScatter:
4218 case Op_LoadVectorGatherMasked:
4219 case Op_StoreVectorScatterMasked:
4220 case Op_VectorCmpMasked:
4221 case Op_VectorMaskGen:
4222 case Op_LoadVectorMasked:
4223 case Op_StoreVectorMasked:
4224 break;
4225
4226 case Op_AddReductionVI:
4227 case Op_AddReductionVL:
4228 case Op_AddReductionVF:
4229 case Op_AddReductionVD:
4230 case Op_MulReductionVI:
4231 case Op_MulReductionVL:
4232 case Op_MulReductionVF:
4233 case Op_MulReductionVD:
4234 case Op_MinReductionV:
4235 case Op_MaxReductionV:
4236 case Op_AndReductionV:
4237 case Op_OrReductionV:
4238 case Op_XorReductionV:
4239 break;
4240
4241 case Op_PackB:
4242 case Op_PackS:
4243 case Op_PackI:
4244 case Op_PackF:
4245 case Op_PackL:
4246 case Op_PackD:
4247 if (n->req()-1 > 2) {
4248 // Replace many operand PackNodes with a binary tree for matching
4249 PackNode* p = (PackNode*) n;
4250 Node* btp = p->binary_tree_pack(1, n->req());
4251 n->subsume_by(btp, this);
4252 }
4253 break;
4254 case Op_Loop:
4255 assert(!n->as_Loop()->is_loop_nest_inner_loop() || _loop_opts_cnt == 0, "should have been turned into a counted loop");
4256 case Op_CountedLoop:
4257 case Op_LongCountedLoop:
4258 case Op_OuterStripMinedLoop:
4259 if (n->as_Loop()->is_inner_loop()) {
4260 frc.inc_inner_loop_count();
4261 }
4262 n->as_Loop()->verify_strip_mined(0);
4263 break;
4264 case Op_LShiftI:
4265 case Op_RShiftI:
4266 case Op_URShiftI:
4267 case Op_LShiftL:
4268 case Op_RShiftL:
4269 case Op_URShiftL:
4270 if (Matcher::need_masked_shift_count) {
4271 // The cpu's shift instructions don't restrict the count to the
4272 // lower 5/6 bits. We need to do the masking ourselves.
4273 Node* in2 = n->in(2);
4274 juint mask = (n->bottom_type() == TypeInt::INT) ? (BitsPerInt - 1) : (BitsPerLong - 1);
4275 const TypeInt* t = in2->find_int_type();
4276 if (t != nullptr && t->is_con()) {
4277 juint shift = t->get_con();
4278 if (shift > mask) { // Unsigned cmp
4279 n->set_req(2, ConNode::make(TypeInt::make(shift & mask)));
4280 }
4281 } else {
4282 if (t == nullptr || t->_lo < 0 || t->_hi > (int)mask) {
4283 Node* shift = new AndINode(in2, ConNode::make(TypeInt::make(mask)));
4284 n->set_req(2, shift);
4285 }
4286 }
4287 if (in2->outcnt() == 0) { // Remove dead node
4288 in2->disconnect_inputs(this);
4289 }
4290 }
4291 break;
4292 case Op_MemBarStoreStore:
4293 case Op_MemBarRelease:
4294 // Break the link with AllocateNode: it is no longer useful and
4295 // confuses register allocation.
4296 if (n->req() > MemBarNode::Precedent) {
4297 n->set_req(MemBarNode::Precedent, top());
4298 }
4299 break;
4300 case Op_MemBarAcquire: {
4301 if (n->as_MemBar()->trailing_load() && n->req() > MemBarNode::Precedent) {
4302 // At parse time, the trailing MemBarAcquire for a volatile load
4303 // is created with an edge to the load. After optimizations,
4304 // that input may be a chain of Phis. If those phis have no
4305 // other use, then the MemBarAcquire keeps them alive and
4306 // register allocation can be confused.
4307 dead_nodes.push(n->in(MemBarNode::Precedent));
4308 n->set_req(MemBarNode::Precedent, top());
4309 }
4310 break;
4311 }
4312 case Op_Blackhole:
4313 break;
4314 case Op_RangeCheck: {
4315 RangeCheckNode* rc = n->as_RangeCheck();
4316 Node* iff = new IfNode(rc->in(0), rc->in(1), rc->_prob, rc->_fcnt);
4317 n->subsume_by(iff, this);
4318 frc._tests.push(iff);
4319 break;
4320 }
4321 case Op_ConvI2L: {
4322 if (!Matcher::convi2l_type_required) {
4323 // Code generation on some platforms doesn't need accurate
4324 // ConvI2L types. Widening the type can help remove redundant
4325 // address computations.
4326 n->as_Type()->set_type(TypeLong::INT);
4327 ResourceMark rm;
4328 Unique_Node_List wq;
4329 wq.push(n);
4330 for (uint next = 0; next < wq.size(); next++) {
4331 Node *m = wq.at(next);
4332
4333 for(;;) {
4334 // Loop over all nodes with identical inputs edges as m
4335 Node* k = m->find_similar(m->Opcode());
4336 if (k == nullptr) {
4337 break;
4338 }
4339 // Push their uses so we get a chance to remove node made
4340 // redundant
4341 for (DUIterator_Fast imax, i = k->fast_outs(imax); i < imax; i++) {
4342 Node* u = k->fast_out(i);
4343 if (u->Opcode() == Op_LShiftL ||
4344 u->Opcode() == Op_AddL ||
4345 u->Opcode() == Op_SubL ||
4346 u->Opcode() == Op_AddP) {
4347 wq.push(u);
4348 }
4349 }
4350 // Replace all nodes with identical edges as m with m
4351 k->subsume_by(m, this);
4352 }
4353 }
4354 }
4355 break;
4356 }
4357 case Op_CmpUL: {
4358 if (!Matcher::has_match_rule(Op_CmpUL)) {
4359 // No support for unsigned long comparisons
4360 ConINode* sign_pos = new ConINode(TypeInt::make(BitsPerLong - 1));
4361 Node* sign_bit_mask = new RShiftLNode(n->in(1), sign_pos);
4362 Node* orl = new OrLNode(n->in(1), sign_bit_mask);
4363 ConLNode* remove_sign_mask = new ConLNode(TypeLong::make(max_jlong));
4364 Node* andl = new AndLNode(orl, remove_sign_mask);
4365 Node* cmp = new CmpLNode(andl, n->in(2));
4366 n->subsume_by(cmp, this);
4367 }
4368 break;
4369 }
4370 #ifdef ASSERT
4371 case Op_InlineType: {
4372 n->dump(-1);
4373 assert(false, "inline type node was not removed");
4374 break;
4375 }
4376 case Op_ConNKlass: {
4377 const TypePtr* tp = n->as_Type()->type()->make_ptr();
4378 ciKlass* klass = tp->is_klassptr()->exact_klass();
4379 assert(klass->is_in_encoding_range(), "klass cannot be compressed");
4380 break;
4381 }
4382 #endif
4383 default:
4384 assert(!n->is_Call(), "");
4385 assert(!n->is_Mem(), "");
4386 assert(nop != Op_ProfileBoolean, "should be eliminated during IGVN");
4387 break;
4388 }
4389 }
4390
4391 //------------------------------final_graph_reshaping_walk---------------------
4392 // Replacing Opaque nodes with their input in final_graph_reshaping_impl(),
4393 // requires that the walk visits a node's inputs before visiting the node.
4394 void Compile::final_graph_reshaping_walk(Node_Stack& nstack, Node* root, Final_Reshape_Counts& frc, Unique_Node_List& dead_nodes) {
4395 Unique_Node_List sfpt;
4396
4397 frc._visited.set(root->_idx); // first, mark node as visited
4398 uint cnt = root->req();
4399 Node *n = root;
4400 uint i = 0;
4401 while (true) {
4402 if (i < cnt) {
4403 // Place all non-visited non-null inputs onto stack
4404 Node* m = n->in(i);
4405 ++i;
4406 if (m != nullptr && !frc._visited.test_set(m->_idx)) {
4407 if (m->is_SafePoint() && m->as_SafePoint()->jvms() != nullptr) {
4408 // compute worst case interpreter size in case of a deoptimization
4409 update_interpreter_frame_size(m->as_SafePoint()->jvms()->interpreter_frame_size());
4410
4411 sfpt.push(m);
4412 }
4413 cnt = m->req();
4414 nstack.push(n, i); // put on stack parent and next input's index
4415 n = m;
4416 i = 0;
4417 }
4418 } else {
4419 // Now do post-visit work
4420 final_graph_reshaping_impl(n, frc, dead_nodes);
4421 if (nstack.is_empty())
4422 break; // finished
4423 n = nstack.node(); // Get node from stack
4424 cnt = n->req();
4425 i = nstack.index();
4426 nstack.pop(); // Shift to the next node on stack
4427 }
4428 }
4429
4430 // Skip next transformation if compressed oops are not used.
4431 if ((UseCompressedOops && !Matcher::gen_narrow_oop_implicit_null_checks()) ||
4432 (!UseCompressedOops && !UseCompressedClassPointers))
4433 return;
4434
4435 // Go over safepoints nodes to skip DecodeN/DecodeNKlass nodes for debug edges.
4436 // It could be done for an uncommon traps or any safepoints/calls
4437 // if the DecodeN/DecodeNKlass node is referenced only in a debug info.
4438 while (sfpt.size() > 0) {
4439 n = sfpt.pop();
4440 JVMState *jvms = n->as_SafePoint()->jvms();
4441 assert(jvms != nullptr, "sanity");
4442 int start = jvms->debug_start();
4443 int end = n->req();
4444 bool is_uncommon = (n->is_CallStaticJava() &&
4445 n->as_CallStaticJava()->uncommon_trap_request() != 0);
4446 for (int j = start; j < end; j++) {
4447 Node* in = n->in(j);
4448 if (in->is_DecodeNarrowPtr()) {
4449 bool safe_to_skip = true;
4450 if (!is_uncommon ) {
4451 // Is it safe to skip?
4452 for (uint i = 0; i < in->outcnt(); i++) {
4453 Node* u = in->raw_out(i);
4454 if (!u->is_SafePoint() ||
4455 (u->is_Call() && u->as_Call()->has_non_debug_use(n))) {
4456 safe_to_skip = false;
4457 }
4458 }
4459 }
4460 if (safe_to_skip) {
4461 n->set_req(j, in->in(1));
4462 }
4463 if (in->outcnt() == 0) {
4464 in->disconnect_inputs(this);
4465 }
4466 }
4467 }
4468 }
4469 }
4470
4471 //------------------------------final_graph_reshaping--------------------------
4472 // Final Graph Reshaping.
4473 //
4474 // (1) Clone simple inputs to uncommon calls, so they can be scheduled late
4475 // and not commoned up and forced early. Must come after regular
4476 // optimizations to avoid GVN undoing the cloning. Clone constant
4477 // inputs to Loop Phis; these will be split by the allocator anyways.
4478 // Remove Opaque nodes.
4479 // (2) Move last-uses by commutative operations to the left input to encourage
4480 // Intel update-in-place two-address operations and better register usage
4481 // on RISCs. Must come after regular optimizations to avoid GVN Ideal
4482 // calls canonicalizing them back.
4483 // (3) Count the number of double-precision FP ops, single-precision FP ops
4484 // and call sites. On Intel, we can get correct rounding either by
4485 // forcing singles to memory (requires extra stores and loads after each
4486 // FP bytecode) or we can set a rounding mode bit (requires setting and
4487 // clearing the mode bit around call sites). The mode bit is only used
4488 // if the relative frequency of single FP ops to calls is low enough.
4489 // This is a key transform for SPEC mpeg_audio.
4490 // (4) Detect infinite loops; blobs of code reachable from above but not
4491 // below. Several of the Code_Gen algorithms fail on such code shapes,
4492 // so we simply bail out. Happens a lot in ZKM.jar, but also happens
4493 // from time to time in other codes (such as -Xcomp finalizer loops, etc).
4494 // Detection is by looking for IfNodes where only 1 projection is
4495 // reachable from below or CatchNodes missing some targets.
4496 // (5) Assert for insane oop offsets in debug mode.
4497
4498 bool Compile::final_graph_reshaping() {
4499 // an infinite loop may have been eliminated by the optimizer,
4500 // in which case the graph will be empty.
4501 if (root()->req() == 1) {
4502 // Do not compile method that is only a trivial infinite loop,
4503 // since the content of the loop may have been eliminated.
4504 record_method_not_compilable("trivial infinite loop");
4505 return true;
4506 }
4507
4508 // Expensive nodes have their control input set to prevent the GVN
4509 // from freely commoning them. There's no GVN beyond this point so
4510 // no need to keep the control input. We want the expensive nodes to
4511 // be freely moved to the least frequent code path by gcm.
4512 assert(OptimizeExpensiveOps || expensive_count() == 0, "optimization off but list non empty?");
4513 for (int i = 0; i < expensive_count(); i++) {
4514 _expensive_nodes.at(i)->set_req(0, nullptr);
4515 }
4516
4517 Final_Reshape_Counts frc;
4518
4519 // Visit everybody reachable!
4520 // Allocate stack of size C->live_nodes()/2 to avoid frequent realloc
4521 Node_Stack nstack(live_nodes() >> 1);
4522 Unique_Node_List dead_nodes;
4523 final_graph_reshaping_walk(nstack, root(), frc, dead_nodes);
4524
4525 // Check for unreachable (from below) code (i.e., infinite loops).
4526 for( uint i = 0; i < frc._tests.size(); i++ ) {
4527 MultiBranchNode *n = frc._tests[i]->as_MultiBranch();
4528 // Get number of CFG targets.
4529 // Note that PCTables include exception targets after calls.
4530 uint required_outcnt = n->required_outcnt();
4531 if (n->outcnt() != required_outcnt) {
4532 // Check for a few special cases. Rethrow Nodes never take the
4533 // 'fall-thru' path, so expected kids is 1 less.
4534 if (n->is_PCTable() && n->in(0) && n->in(0)->in(0)) {
4535 if (n->in(0)->in(0)->is_Call()) {
4536 CallNode* call = n->in(0)->in(0)->as_Call();
4537 if (call->entry_point() == OptoRuntime::rethrow_stub()) {
4538 required_outcnt--; // Rethrow always has 1 less kid
4539 } else if (call->req() > TypeFunc::Parms &&
4540 call->is_CallDynamicJava()) {
4541 // Check for null receiver. In such case, the optimizer has
4542 // detected that the virtual call will always result in a null
4543 // pointer exception. The fall-through projection of this CatchNode
4544 // will not be populated.
4545 Node* arg0 = call->in(TypeFunc::Parms);
4546 if (arg0->is_Type() &&
4547 arg0->as_Type()->type()->higher_equal(TypePtr::NULL_PTR)) {
4548 required_outcnt--;
4549 }
4550 } else if (call->entry_point() == OptoRuntime::new_array_Java() ||
4551 call->entry_point() == OptoRuntime::new_array_nozero_Java()) {
4552 // Check for illegal array length. In such case, the optimizer has
4553 // detected that the allocation attempt will always result in an
4554 // exception. There is no fall-through projection of this CatchNode .
4555 assert(call->is_CallStaticJava(), "static call expected");
4556 assert(call->req() == call->jvms()->endoff() + 1, "missing extra input");
4557 uint valid_length_test_input = call->req() - 1;
4558 Node* valid_length_test = call->in(valid_length_test_input);
4559 call->del_req(valid_length_test_input);
4560 if (valid_length_test->find_int_con(1) == 0) {
4561 required_outcnt--;
4562 }
4563 dead_nodes.push(valid_length_test);
4564 assert(n->outcnt() == required_outcnt, "malformed control flow");
4565 continue;
4566 }
4567 }
4568 }
4569
4570 // Recheck with a better notion of 'required_outcnt'
4571 if (n->outcnt() != required_outcnt) {
4572 record_method_not_compilable("malformed control flow");
4573 return true; // Not all targets reachable!
4574 }
4575 } else if (n->is_PCTable() && n->in(0) && n->in(0)->in(0) && n->in(0)->in(0)->is_Call()) {
4576 CallNode* call = n->in(0)->in(0)->as_Call();
4577 if (call->entry_point() == OptoRuntime::new_array_Java() ||
4578 call->entry_point() == OptoRuntime::new_array_nozero_Java()) {
4579 assert(call->is_CallStaticJava(), "static call expected");
4580 assert(call->req() == call->jvms()->endoff() + 1, "missing extra input");
4581 uint valid_length_test_input = call->req() - 1;
4582 dead_nodes.push(call->in(valid_length_test_input));
4583 call->del_req(valid_length_test_input); // valid length test useless now
4584 }
4585 }
4586 // Check that I actually visited all kids. Unreached kids
4587 // must be infinite loops.
4588 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++)
4589 if (!frc._visited.test(n->fast_out(j)->_idx)) {
4590 record_method_not_compilable("infinite loop");
4591 return true; // Found unvisited kid; must be unreach
4592 }
4593
4594 // Here so verification code in final_graph_reshaping_walk()
4595 // always see an OuterStripMinedLoopEnd
4596 if (n->is_OuterStripMinedLoopEnd() || n->is_LongCountedLoopEnd()) {
4597 IfNode* init_iff = n->as_If();
4598 Node* iff = new IfNode(init_iff->in(0), init_iff->in(1), init_iff->_prob, init_iff->_fcnt);
4599 n->subsume_by(iff, this);
4600 }
4601 }
4602
4603 while (dead_nodes.size() > 0) {
4604 Node* m = dead_nodes.pop();
4605 if (m->outcnt() == 0 && m != top()) {
4606 for (uint j = 0; j < m->req(); j++) {
4607 Node* in = m->in(j);
4608 if (in != nullptr) {
4609 dead_nodes.push(in);
4610 }
4611 }
4612 m->disconnect_inputs(this);
4613 }
4614 }
4615
4616 set_java_calls(frc.get_java_call_count());
4617 set_inner_loops(frc.get_inner_loop_count());
4618
4619 // No infinite loops, no reason to bail out.
4620 return false;
4621 }
4622
4623 //-----------------------------too_many_traps----------------------------------
4624 // Report if there are too many traps at the current method and bci.
4625 // Return true if there was a trap, and/or PerMethodTrapLimit is exceeded.
4626 bool Compile::too_many_traps(ciMethod* method,
4627 int bci,
4628 Deoptimization::DeoptReason reason) {
4629 ciMethodData* md = method->method_data();
4630 if (md->is_empty()) {
4631 // Assume the trap has not occurred, or that it occurred only
4632 // because of a transient condition during start-up in the interpreter.
4633 return false;
4634 }
4635 ciMethod* m = Deoptimization::reason_is_speculate(reason) ? this->method() : nullptr;
4636 if (md->has_trap_at(bci, m, reason) != 0) {
4637 // Assume PerBytecodeTrapLimit==0, for a more conservative heuristic.
4638 // Also, if there are multiple reasons, or if there is no per-BCI record,
4639 // assume the worst.
4640 if (log())
4641 log()->elem("observe trap='%s' count='%d'",
4642 Deoptimization::trap_reason_name(reason),
4643 md->trap_count(reason));
4644 return true;
4645 } else {
4646 // Ignore method/bci and see if there have been too many globally.
4647 return too_many_traps(reason, md);
4648 }
4649 }
4650
4651 // Less-accurate variant which does not require a method and bci.
4652 bool Compile::too_many_traps(Deoptimization::DeoptReason reason,
4653 ciMethodData* logmd) {
4654 if (trap_count(reason) >= Deoptimization::per_method_trap_limit(reason)) {
4655 // Too many traps globally.
4656 // Note that we use cumulative trap_count, not just md->trap_count.
4657 if (log()) {
4658 int mcount = (logmd == nullptr)? -1: (int)logmd->trap_count(reason);
4659 log()->elem("observe trap='%s' count='0' mcount='%d' ccount='%d'",
4660 Deoptimization::trap_reason_name(reason),
4661 mcount, trap_count(reason));
4662 }
4663 return true;
4664 } else {
4665 // The coast is clear.
4666 return false;
4667 }
4668 }
4669
4670 //--------------------------too_many_recompiles--------------------------------
4671 // Report if there are too many recompiles at the current method and bci.
4672 // Consults PerBytecodeRecompilationCutoff and PerMethodRecompilationCutoff.
4673 // Is not eager to return true, since this will cause the compiler to use
4674 // Action_none for a trap point, to avoid too many recompilations.
4675 bool Compile::too_many_recompiles(ciMethod* method,
4676 int bci,
4677 Deoptimization::DeoptReason reason) {
4678 ciMethodData* md = method->method_data();
4679 if (md->is_empty()) {
4680 // Assume the trap has not occurred, or that it occurred only
4681 // because of a transient condition during start-up in the interpreter.
4682 return false;
4683 }
4684 // Pick a cutoff point well within PerBytecodeRecompilationCutoff.
4685 uint bc_cutoff = (uint) PerBytecodeRecompilationCutoff / 8;
4686 uint m_cutoff = (uint) PerMethodRecompilationCutoff / 2 + 1; // not zero
4687 Deoptimization::DeoptReason per_bc_reason
4688 = Deoptimization::reason_recorded_per_bytecode_if_any(reason);
4689 ciMethod* m = Deoptimization::reason_is_speculate(reason) ? this->method() : nullptr;
4690 if ((per_bc_reason == Deoptimization::Reason_none
4691 || md->has_trap_at(bci, m, reason) != 0)
4692 // The trap frequency measure we care about is the recompile count:
4693 && md->trap_recompiled_at(bci, m)
4694 && md->overflow_recompile_count() >= bc_cutoff) {
4695 // Do not emit a trap here if it has already caused recompilations.
4696 // Also, if there are multiple reasons, or if there is no per-BCI record,
4697 // assume the worst.
4698 if (log())
4699 log()->elem("observe trap='%s recompiled' count='%d' recompiles2='%d'",
4700 Deoptimization::trap_reason_name(reason),
4701 md->trap_count(reason),
4702 md->overflow_recompile_count());
4703 return true;
4704 } else if (trap_count(reason) != 0
4705 && decompile_count() >= m_cutoff) {
4706 // Too many recompiles globally, and we have seen this sort of trap.
4707 // Use cumulative decompile_count, not just md->decompile_count.
4708 if (log())
4709 log()->elem("observe trap='%s' count='%d' mcount='%d' decompiles='%d' mdecompiles='%d'",
4710 Deoptimization::trap_reason_name(reason),
4711 md->trap_count(reason), trap_count(reason),
4712 md->decompile_count(), decompile_count());
4713 return true;
4714 } else {
4715 // The coast is clear.
4716 return false;
4717 }
4718 }
4719
4720 // Compute when not to trap. Used by matching trap based nodes and
4721 // NullCheck optimization.
4722 void Compile::set_allowed_deopt_reasons() {
4723 _allowed_reasons = 0;
4724 if (is_method_compilation()) {
4725 for (int rs = (int)Deoptimization::Reason_none+1; rs < Compile::trapHistLength; rs++) {
4726 assert(rs < BitsPerInt, "recode bit map");
4727 if (!too_many_traps((Deoptimization::DeoptReason) rs)) {
4728 _allowed_reasons |= nth_bit(rs);
4729 }
4730 }
4731 }
4732 }
4733
4734 bool Compile::needs_clinit_barrier(ciMethod* method, ciMethod* accessing_method) {
4735 return method->is_static() && needs_clinit_barrier(method->holder(), accessing_method);
4736 }
4737
4738 bool Compile::needs_clinit_barrier(ciField* field, ciMethod* accessing_method) {
4739 return field->is_static() && needs_clinit_barrier(field->holder(), accessing_method);
4740 }
4741
4742 bool Compile::needs_clinit_barrier(ciInstanceKlass* holder, ciMethod* accessing_method) {
4743 if (holder->is_initialized()) {
4744 return false;
4745 }
4746 if (holder->is_being_initialized()) {
4747 if (accessing_method->holder() == holder) {
4748 // Access inside a class. The barrier can be elided when access happens in <clinit>,
4749 // <init>, or a static method. In all those cases, there was an initialization
4750 // barrier on the holder klass passed.
4751 if (accessing_method->is_class_initializer() ||
4752 accessing_method->is_object_constructor() ||
4753 accessing_method->is_static()) {
4754 return false;
4755 }
4756 } else if (accessing_method->holder()->is_subclass_of(holder)) {
4757 // Access from a subclass. The barrier can be elided only when access happens in <clinit>.
4758 // In case of <init> or a static method, the barrier is on the subclass is not enough:
4759 // child class can become fully initialized while its parent class is still being initialized.
4760 if (accessing_method->is_class_initializer()) {
4761 return false;
4762 }
4763 }
4764 ciMethod* root = method(); // the root method of compilation
4765 if (root != accessing_method) {
4766 return needs_clinit_barrier(holder, root); // check access in the context of compilation root
4767 }
4768 }
4769 return true;
4770 }
4771
4772 #ifndef PRODUCT
4773 //------------------------------verify_bidirectional_edges---------------------
4774 // For each input edge to a node (ie - for each Use-Def edge), verify that
4775 // there is a corresponding Def-Use edge.
4776 void Compile::verify_bidirectional_edges(Unique_Node_List& visited, const Unique_Node_List* root_and_safepoints) const {
4777 // Allocate stack of size C->live_nodes()/16 to avoid frequent realloc
4778 uint stack_size = live_nodes() >> 4;
4779 Node_List nstack(MAX2(stack_size, (uint) OptoNodeListSize));
4780 if (root_and_safepoints != nullptr) {
4781 assert(root_and_safepoints->member(_root), "root is not in root_and_safepoints");
4782 for (uint i = 0, limit = root_and_safepoints->size(); i < limit; i++) {
4783 Node* root_or_safepoint = root_and_safepoints->at(i);
4784 // If the node is a safepoint, let's check if it still has a control input
4785 // Lack of control input signifies that this node was killed by CCP or
4786 // recursively by remove_globally_dead_node and it shouldn't be a starting
4787 // point.
4788 if (!root_or_safepoint->is_SafePoint() || root_or_safepoint->in(0) != nullptr) {
4789 nstack.push(root_or_safepoint);
4790 }
4791 }
4792 } else {
4793 nstack.push(_root);
4794 }
4795
4796 while (nstack.size() > 0) {
4797 Node* n = nstack.pop();
4798 if (visited.member(n)) {
4799 continue;
4800 }
4801 visited.push(n);
4802
4803 // Walk over all input edges, checking for correspondence
4804 uint length = n->len();
4805 for (uint i = 0; i < length; i++) {
4806 Node* in = n->in(i);
4807 if (in != nullptr && !visited.member(in)) {
4808 nstack.push(in); // Put it on stack
4809 }
4810 if (in != nullptr && !in->is_top()) {
4811 // Count instances of `next`
4812 int cnt = 0;
4813 for (uint idx = 0; idx < in->_outcnt; idx++) {
4814 if (in->_out[idx] == n) {
4815 cnt++;
4816 }
4817 }
4818 assert(cnt > 0, "Failed to find Def-Use edge.");
4819 // Check for duplicate edges
4820 // walk the input array downcounting the input edges to n
4821 for (uint j = 0; j < length; j++) {
4822 if (n->in(j) == in) {
4823 cnt--;
4824 }
4825 }
4826 assert(cnt == 0, "Mismatched edge count.");
4827 } else if (in == nullptr) {
4828 assert(i == 0 || i >= n->req() ||
4829 n->is_Region() || n->is_Phi() || n->is_ArrayCopy() ||
4830 (n->is_Allocate() && i >= AllocateNode::InlineType) ||
4831 (n->is_Unlock() && i == (n->req() - 1)) ||
4832 (n->is_MemBar() && i == 5), // the precedence edge to a membar can be removed during macro node expansion
4833 "only region, phi, arraycopy, allocate, unlock or membar nodes have null data edges");
4834 } else {
4835 assert(in->is_top(), "sanity");
4836 // Nothing to check.
4837 }
4838 }
4839 }
4840 }
4841
4842 //------------------------------verify_graph_edges---------------------------
4843 // Walk the Graph and verify that there is a one-to-one correspondence
4844 // between Use-Def edges and Def-Use edges in the graph.
4845 void Compile::verify_graph_edges(bool no_dead_code, const Unique_Node_List* root_and_safepoints) const {
4846 if (VerifyGraphEdges) {
4847 Unique_Node_List visited;
4848
4849 // Call graph walk to check edges
4850 verify_bidirectional_edges(visited, root_and_safepoints);
4851 if (no_dead_code) {
4852 // Now make sure that no visited node is used by an unvisited node.
4853 bool dead_nodes = false;
4854 Unique_Node_List checked;
4855 while (visited.size() > 0) {
4856 Node* n = visited.pop();
4857 checked.push(n);
4858 for (uint i = 0; i < n->outcnt(); i++) {
4859 Node* use = n->raw_out(i);
4860 if (checked.member(use)) continue; // already checked
4861 if (visited.member(use)) continue; // already in the graph
4862 if (use->is_Con()) continue; // a dead ConNode is OK
4863 // At this point, we have found a dead node which is DU-reachable.
4864 if (!dead_nodes) {
4865 tty->print_cr("*** Dead nodes reachable via DU edges:");
4866 dead_nodes = true;
4867 }
4868 use->dump(2);
4869 tty->print_cr("---");
4870 checked.push(use); // No repeats; pretend it is now checked.
4871 }
4872 }
4873 assert(!dead_nodes, "using nodes must be reachable from root");
4874 }
4875 }
4876 }
4877 #endif
4878
4879 // The Compile object keeps track of failure reasons separately from the ciEnv.
4880 // This is required because there is not quite a 1-1 relation between the
4881 // ciEnv and its compilation task and the Compile object. Note that one
4882 // ciEnv might use two Compile objects, if C2Compiler::compile_method decides
4883 // to backtrack and retry without subsuming loads. Other than this backtracking
4884 // behavior, the Compile's failure reason is quietly copied up to the ciEnv
4885 // by the logic in C2Compiler.
4886 void Compile::record_failure(const char* reason DEBUG_ONLY(COMMA bool allow_multiple_failures)) {
4887 if (log() != nullptr) {
4888 log()->elem("failure reason='%s' phase='compile'", reason);
4889 }
4890 if (_failure_reason.get() == nullptr) {
4891 // Record the first failure reason.
4892 _failure_reason.set(reason);
4893 if (CaptureBailoutInformation) {
4894 _first_failure_details = new CompilationFailureInfo(reason);
4895 }
4896 } else {
4897 assert(!StressBailout || allow_multiple_failures, "should have handled previous failure.");
4898 }
4899
4900 if (!C->failure_reason_is(C2Compiler::retry_no_subsuming_loads())) {
4901 C->print_method(PHASE_FAILURE, 1);
4902 }
4903 _root = nullptr; // flush the graph, too
4904 }
4905
4906 Compile::TracePhase::TracePhase(const char* name, PhaseTraceId id)
4907 : TraceTime(name, &Phase::timers[id], CITime, CITimeVerbose),
4908 _compile(Compile::current()),
4909 _log(nullptr),
4910 _dolog(CITimeVerbose)
4911 {
4912 assert(_compile != nullptr, "sanity check");
4913 assert(id != PhaseTraceId::_t_none, "Don't use none");
4914 if (_dolog) {
4915 _log = _compile->log();
4916 }
4917 if (_log != nullptr) {
4918 _log->begin_head("phase name='%s' nodes='%d' live='%d'", phase_name(), _compile->unique(), _compile->live_nodes());
4919 _log->stamp();
4920 _log->end_head();
4921 }
4922
4923 // Inform memory statistic, if enabled
4924 if (CompilationMemoryStatistic::enabled()) {
4925 CompilationMemoryStatistic::on_phase_start((int)id, name);
4926 }
4927 }
4928
4929 Compile::TracePhase::TracePhase(PhaseTraceId id)
4930 : TracePhase(Phase::get_phase_trace_id_text(id), id) {}
4931
4932 Compile::TracePhase::~TracePhase() {
4933
4934 // Inform memory statistic, if enabled
4935 if (CompilationMemoryStatistic::enabled()) {
4936 CompilationMemoryStatistic::on_phase_end();
4937 }
4938
4939 if (_compile->failing_internal()) {
4940 if (_log != nullptr) {
4941 _log->done("phase");
4942 }
4943 return; // timing code, not stressing bailouts.
4944 }
4945 #ifdef ASSERT
4946 if (PrintIdealNodeCount) {
4947 tty->print_cr("phase name='%s' nodes='%d' live='%d' live_graph_walk='%d'",
4948 phase_name(), _compile->unique(), _compile->live_nodes(), _compile->count_live_nodes_by_graph_walk());
4949 }
4950
4951 if (VerifyIdealNodeCount) {
4952 _compile->print_missing_nodes();
4953 }
4954 #endif
4955
4956 if (_log != nullptr) {
4957 _log->done("phase name='%s' nodes='%d' live='%d'", phase_name(), _compile->unique(), _compile->live_nodes());
4958 }
4959 }
4960
4961 //----------------------------static_subtype_check-----------------------------
4962 // Shortcut important common cases when superklass is exact:
4963 // (0) superklass is java.lang.Object (can occur in reflective code)
4964 // (1) subklass is already limited to a subtype of superklass => always ok
4965 // (2) subklass does not overlap with superklass => always fail
4966 // (3) superklass has NO subtypes and we can check with a simple compare.
4967 Compile::SubTypeCheckResult Compile::static_subtype_check(const TypeKlassPtr* superk, const TypeKlassPtr* subk, bool skip) {
4968 if (skip) {
4969 return SSC_full_test; // Let caller generate the general case.
4970 }
4971
4972 if (subk->is_java_subtype_of(superk)) {
4973 return SSC_always_true; // (0) and (1) this test cannot fail
4974 }
4975
4976 if (!subk->maybe_java_subtype_of(superk)) {
4977 return SSC_always_false; // (2) true path dead; no dynamic test needed
4978 }
4979
4980 const Type* superelem = superk;
4981 if (superk->isa_aryklassptr()) {
4982 int ignored;
4983 superelem = superk->is_aryklassptr()->base_element_type(ignored);
4984
4985 // Do not fold the subtype check to an array klass pointer comparison for null-able inline type arrays
4986 // because null-free [LMyValue <: null-able [LMyValue but the klasses are different. Perform a full test.
4987 if (!superk->is_aryklassptr()->is_null_free() && superk->is_aryklassptr()->elem()->isa_instklassptr() &&
4988 superk->is_aryklassptr()->elem()->is_instklassptr()->instance_klass()->is_inlinetype()) {
4989 return SSC_full_test;
4990 }
4991 }
4992
4993 if (superelem->isa_instklassptr()) {
4994 ciInstanceKlass* ik = superelem->is_instklassptr()->instance_klass();
4995 if (!ik->has_subklass()) {
4996 if (!ik->is_final()) {
4997 // Add a dependency if there is a chance of a later subclass.
4998 dependencies()->assert_leaf_type(ik);
4999 }
5000 if (!superk->maybe_java_subtype_of(subk)) {
5001 return SSC_always_false;
5002 }
5003 return SSC_easy_test; // (3) caller can do a simple ptr comparison
5004 }
5005 } else {
5006 // A primitive array type has no subtypes.
5007 return SSC_easy_test; // (3) caller can do a simple ptr comparison
5008 }
5009
5010 return SSC_full_test;
5011 }
5012
5013 Node* Compile::conv_I2X_index(PhaseGVN* phase, Node* idx, const TypeInt* sizetype, Node* ctrl) {
5014 #ifdef _LP64
5015 // The scaled index operand to AddP must be a clean 64-bit value.
5016 // Java allows a 32-bit int to be incremented to a negative
5017 // value, which appears in a 64-bit register as a large
5018 // positive number. Using that large positive number as an
5019 // operand in pointer arithmetic has bad consequences.
5020 // On the other hand, 32-bit overflow is rare, and the possibility
5021 // can often be excluded, if we annotate the ConvI2L node with
5022 // a type assertion that its value is known to be a small positive
5023 // number. (The prior range check has ensured this.)
5024 // This assertion is used by ConvI2LNode::Ideal.
5025 int index_max = max_jint - 1; // array size is max_jint, index is one less
5026 if (sizetype != nullptr) index_max = sizetype->_hi - 1;
5027 const TypeInt* iidxtype = TypeInt::make(0, index_max, Type::WidenMax);
5028 idx = constrained_convI2L(phase, idx, iidxtype, ctrl);
5029 #endif
5030 return idx;
5031 }
5032
5033 // Convert integer value to a narrowed long type dependent on ctrl (for example, a range check)
5034 Node* Compile::constrained_convI2L(PhaseGVN* phase, Node* value, const TypeInt* itype, Node* ctrl, bool carry_dependency) {
5035 if (ctrl != nullptr) {
5036 // Express control dependency by a CastII node with a narrow type.
5037 // Make the CastII node dependent on the control input to prevent the narrowed ConvI2L
5038 // node from floating above the range check during loop optimizations. Otherwise, the
5039 // ConvI2L node may be eliminated independently of the range check, causing the data path
5040 // to become TOP while the control path is still there (although it's unreachable).
5041 value = new CastIINode(ctrl, value, itype, carry_dependency ? ConstraintCastNode::StrongDependency : ConstraintCastNode::RegularDependency, true /* range check dependency */);
5042 value = phase->transform(value);
5043 }
5044 const TypeLong* ltype = TypeLong::make(itype->_lo, itype->_hi, itype->_widen);
5045 return phase->transform(new ConvI2LNode(value, ltype));
5046 }
5047
5048 void Compile::dump_print_inlining() {
5049 inline_printer()->print_on(tty);
5050 }
5051
5052 void Compile::log_late_inline(CallGenerator* cg) {
5053 if (log() != nullptr) {
5054 log()->head("late_inline method='%d' inline_id='" JLONG_FORMAT "'", log()->identify(cg->method()),
5055 cg->unique_id());
5056 JVMState* p = cg->call_node()->jvms();
5057 while (p != nullptr) {
5058 log()->elem("jvms bci='%d' method='%d'", p->bci(), log()->identify(p->method()));
5059 p = p->caller();
5060 }
5061 log()->tail("late_inline");
5062 }
5063 }
5064
5065 void Compile::log_late_inline_failure(CallGenerator* cg, const char* msg) {
5066 log_late_inline(cg);
5067 if (log() != nullptr) {
5068 log()->inline_fail(msg);
5069 }
5070 }
5071
5072 void Compile::log_inline_id(CallGenerator* cg) {
5073 if (log() != nullptr) {
5074 // The LogCompilation tool needs a unique way to identify late
5075 // inline call sites. This id must be unique for this call site in
5076 // this compilation. Try to have it unique across compilations as
5077 // well because it can be convenient when grepping through the log
5078 // file.
5079 // Distinguish OSR compilations from others in case CICountOSR is
5080 // on.
5081 jlong id = ((jlong)unique()) + (((jlong)compile_id()) << 33) + (CICountOSR && is_osr_compilation() ? ((jlong)1) << 32 : 0);
5082 cg->set_unique_id(id);
5083 log()->elem("inline_id id='" JLONG_FORMAT "'", id);
5084 }
5085 }
5086
5087 void Compile::log_inline_failure(const char* msg) {
5088 if (C->log() != nullptr) {
5089 C->log()->inline_fail(msg);
5090 }
5091 }
5092
5093
5094 // Dump inlining replay data to the stream.
5095 // Don't change thread state and acquire any locks.
5096 void Compile::dump_inline_data(outputStream* out) {
5097 InlineTree* inl_tree = ilt();
5098 if (inl_tree != nullptr) {
5099 out->print(" inline %d", inl_tree->count());
5100 inl_tree->dump_replay_data(out);
5101 }
5102 }
5103
5104 void Compile::dump_inline_data_reduced(outputStream* out) {
5105 assert(ReplayReduce, "");
5106
5107 InlineTree* inl_tree = ilt();
5108 if (inl_tree == nullptr) {
5109 return;
5110 }
5111 // Enable iterative replay file reduction
5112 // Output "compile" lines for depth 1 subtrees,
5113 // simulating that those trees were compiled
5114 // instead of inlined.
5115 for (int i = 0; i < inl_tree->subtrees().length(); ++i) {
5116 InlineTree* sub = inl_tree->subtrees().at(i);
5117 if (sub->inline_level() != 1) {
5118 continue;
5119 }
5120
5121 ciMethod* method = sub->method();
5122 int entry_bci = -1;
5123 int comp_level = env()->task()->comp_level();
5124 out->print("compile ");
5125 method->dump_name_as_ascii(out);
5126 out->print(" %d %d", entry_bci, comp_level);
5127 out->print(" inline %d", sub->count());
5128 sub->dump_replay_data(out, -1);
5129 out->cr();
5130 }
5131 }
5132
5133 int Compile::cmp_expensive_nodes(Node* n1, Node* n2) {
5134 if (n1->Opcode() < n2->Opcode()) return -1;
5135 else if (n1->Opcode() > n2->Opcode()) return 1;
5136
5137 assert(n1->req() == n2->req(), "can't compare %s nodes: n1->req() = %d, n2->req() = %d", NodeClassNames[n1->Opcode()], n1->req(), n2->req());
5138 for (uint i = 1; i < n1->req(); i++) {
5139 if (n1->in(i) < n2->in(i)) return -1;
5140 else if (n1->in(i) > n2->in(i)) return 1;
5141 }
5142
5143 return 0;
5144 }
5145
5146 int Compile::cmp_expensive_nodes(Node** n1p, Node** n2p) {
5147 Node* n1 = *n1p;
5148 Node* n2 = *n2p;
5149
5150 return cmp_expensive_nodes(n1, n2);
5151 }
5152
5153 void Compile::sort_expensive_nodes() {
5154 if (!expensive_nodes_sorted()) {
5155 _expensive_nodes.sort(cmp_expensive_nodes);
5156 }
5157 }
5158
5159 bool Compile::expensive_nodes_sorted() const {
5160 for (int i = 1; i < _expensive_nodes.length(); i++) {
5161 if (cmp_expensive_nodes(_expensive_nodes.adr_at(i), _expensive_nodes.adr_at(i-1)) < 0) {
5162 return false;
5163 }
5164 }
5165 return true;
5166 }
5167
5168 bool Compile::should_optimize_expensive_nodes(PhaseIterGVN &igvn) {
5169 if (_expensive_nodes.length() == 0) {
5170 return false;
5171 }
5172
5173 assert(OptimizeExpensiveOps, "optimization off?");
5174
5175 // Take this opportunity to remove dead nodes from the list
5176 int j = 0;
5177 for (int i = 0; i < _expensive_nodes.length(); i++) {
5178 Node* n = _expensive_nodes.at(i);
5179 if (!n->is_unreachable(igvn)) {
5180 assert(n->is_expensive(), "should be expensive");
5181 _expensive_nodes.at_put(j, n);
5182 j++;
5183 }
5184 }
5185 _expensive_nodes.trunc_to(j);
5186
5187 // Then sort the list so that similar nodes are next to each other
5188 // and check for at least two nodes of identical kind with same data
5189 // inputs.
5190 sort_expensive_nodes();
5191
5192 for (int i = 0; i < _expensive_nodes.length()-1; i++) {
5193 if (cmp_expensive_nodes(_expensive_nodes.adr_at(i), _expensive_nodes.adr_at(i+1)) == 0) {
5194 return true;
5195 }
5196 }
5197
5198 return false;
5199 }
5200
5201 void Compile::cleanup_expensive_nodes(PhaseIterGVN &igvn) {
5202 if (_expensive_nodes.length() == 0) {
5203 return;
5204 }
5205
5206 assert(OptimizeExpensiveOps, "optimization off?");
5207
5208 // Sort to bring similar nodes next to each other and clear the
5209 // control input of nodes for which there's only a single copy.
5210 sort_expensive_nodes();
5211
5212 int j = 0;
5213 int identical = 0;
5214 int i = 0;
5215 bool modified = false;
5216 for (; i < _expensive_nodes.length()-1; i++) {
5217 assert(j <= i, "can't write beyond current index");
5218 if (_expensive_nodes.at(i)->Opcode() == _expensive_nodes.at(i+1)->Opcode()) {
5219 identical++;
5220 _expensive_nodes.at_put(j++, _expensive_nodes.at(i));
5221 continue;
5222 }
5223 if (identical > 0) {
5224 _expensive_nodes.at_put(j++, _expensive_nodes.at(i));
5225 identical = 0;
5226 } else {
5227 Node* n = _expensive_nodes.at(i);
5228 igvn.replace_input_of(n, 0, nullptr);
5229 igvn.hash_insert(n);
5230 modified = true;
5231 }
5232 }
5233 if (identical > 0) {
5234 _expensive_nodes.at_put(j++, _expensive_nodes.at(i));
5235 } else if (_expensive_nodes.length() >= 1) {
5236 Node* n = _expensive_nodes.at(i);
5237 igvn.replace_input_of(n, 0, nullptr);
5238 igvn.hash_insert(n);
5239 modified = true;
5240 }
5241 _expensive_nodes.trunc_to(j);
5242 if (modified) {
5243 igvn.optimize();
5244 }
5245 }
5246
5247 void Compile::add_expensive_node(Node * n) {
5248 assert(!_expensive_nodes.contains(n), "duplicate entry in expensive list");
5249 assert(n->is_expensive(), "expensive nodes with non-null control here only");
5250 assert(!n->is_CFG() && !n->is_Mem(), "no cfg or memory nodes here");
5251 if (OptimizeExpensiveOps) {
5252 _expensive_nodes.append(n);
5253 } else {
5254 // Clear control input and let IGVN optimize expensive nodes if
5255 // OptimizeExpensiveOps is off.
5256 n->set_req(0, nullptr);
5257 }
5258 }
5259
5260 /**
5261 * Track coarsened Lock and Unlock nodes.
5262 */
5263
5264 class Lock_List : public Node_List {
5265 uint _origin_cnt;
5266 public:
5267 Lock_List(Arena *a, uint cnt) : Node_List(a), _origin_cnt(cnt) {}
5268 uint origin_cnt() const { return _origin_cnt; }
5269 };
5270
5271 void Compile::add_coarsened_locks(GrowableArray<AbstractLockNode*>& locks) {
5272 int length = locks.length();
5273 if (length > 0) {
5274 // Have to keep this list until locks elimination during Macro nodes elimination.
5275 Lock_List* locks_list = new (comp_arena()) Lock_List(comp_arena(), length);
5276 AbstractLockNode* alock = locks.at(0);
5277 BoxLockNode* box = alock->box_node()->as_BoxLock();
5278 for (int i = 0; i < length; i++) {
5279 AbstractLockNode* lock = locks.at(i);
5280 assert(lock->is_coarsened(), "expecting only coarsened AbstractLock nodes, but got '%s'[%d] node", lock->Name(), lock->_idx);
5281 locks_list->push(lock);
5282 BoxLockNode* this_box = lock->box_node()->as_BoxLock();
5283 if (this_box != box) {
5284 // Locking regions (BoxLock) could be Unbalanced here:
5285 // - its coarsened locks were eliminated in earlier
5286 // macro nodes elimination followed by loop unroll
5287 // - it is OSR locking region (no Lock node)
5288 // Preserve Unbalanced status in such cases.
5289 if (!this_box->is_unbalanced()) {
5290 this_box->set_coarsened();
5291 }
5292 if (!box->is_unbalanced()) {
5293 box->set_coarsened();
5294 }
5295 }
5296 }
5297 _coarsened_locks.append(locks_list);
5298 }
5299 }
5300
5301 void Compile::remove_useless_coarsened_locks(Unique_Node_List& useful) {
5302 int count = coarsened_count();
5303 for (int i = 0; i < count; i++) {
5304 Node_List* locks_list = _coarsened_locks.at(i);
5305 for (uint j = 0; j < locks_list->size(); j++) {
5306 Node* lock = locks_list->at(j);
5307 assert(lock->is_AbstractLock(), "sanity");
5308 if (!useful.member(lock)) {
5309 locks_list->yank(lock);
5310 }
5311 }
5312 }
5313 }
5314
5315 void Compile::remove_coarsened_lock(Node* n) {
5316 if (n->is_AbstractLock()) {
5317 int count = coarsened_count();
5318 for (int i = 0; i < count; i++) {
5319 Node_List* locks_list = _coarsened_locks.at(i);
5320 locks_list->yank(n);
5321 }
5322 }
5323 }
5324
5325 bool Compile::coarsened_locks_consistent() {
5326 int count = coarsened_count();
5327 for (int i = 0; i < count; i++) {
5328 bool unbalanced = false;
5329 bool modified = false; // track locks kind modifications
5330 Lock_List* locks_list = (Lock_List*)_coarsened_locks.at(i);
5331 uint size = locks_list->size();
5332 if (size == 0) {
5333 unbalanced = false; // All locks were eliminated - good
5334 } else if (size != locks_list->origin_cnt()) {
5335 unbalanced = true; // Some locks were removed from list
5336 } else {
5337 for (uint j = 0; j < size; j++) {
5338 Node* lock = locks_list->at(j);
5339 // All nodes in group should have the same state (modified or not)
5340 if (!lock->as_AbstractLock()->is_coarsened()) {
5341 if (j == 0) {
5342 // first on list was modified, the rest should be too for consistency
5343 modified = true;
5344 } else if (!modified) {
5345 // this lock was modified but previous locks on the list were not
5346 unbalanced = true;
5347 break;
5348 }
5349 } else if (modified) {
5350 // previous locks on list were modified but not this lock
5351 unbalanced = true;
5352 break;
5353 }
5354 }
5355 }
5356 if (unbalanced) {
5357 // unbalanced monitor enter/exit - only some [un]lock nodes were removed or modified
5358 #ifdef ASSERT
5359 if (PrintEliminateLocks) {
5360 tty->print_cr("=== unbalanced coarsened locks ===");
5361 for (uint l = 0; l < size; l++) {
5362 locks_list->at(l)->dump();
5363 }
5364 }
5365 #endif
5366 record_failure(C2Compiler::retry_no_locks_coarsening());
5367 return false;
5368 }
5369 }
5370 return true;
5371 }
5372
5373 // Mark locking regions (identified by BoxLockNode) as unbalanced if
5374 // locks coarsening optimization removed Lock/Unlock nodes from them.
5375 // Such regions become unbalanced because coarsening only removes part
5376 // of Lock/Unlock nodes in region. As result we can't execute other
5377 // locks elimination optimizations which assume all code paths have
5378 // corresponding pair of Lock/Unlock nodes - they are balanced.
5379 void Compile::mark_unbalanced_boxes() const {
5380 int count = coarsened_count();
5381 for (int i = 0; i < count; i++) {
5382 Node_List* locks_list = _coarsened_locks.at(i);
5383 uint size = locks_list->size();
5384 if (size > 0) {
5385 AbstractLockNode* alock = locks_list->at(0)->as_AbstractLock();
5386 BoxLockNode* box = alock->box_node()->as_BoxLock();
5387 if (alock->is_coarsened()) {
5388 // coarsened_locks_consistent(), which is called before this method, verifies
5389 // that the rest of Lock/Unlock nodes on locks_list are also coarsened.
5390 assert(!box->is_eliminated(), "regions with coarsened locks should not be marked as eliminated");
5391 for (uint j = 1; j < size; j++) {
5392 assert(locks_list->at(j)->as_AbstractLock()->is_coarsened(), "only coarsened locks are expected here");
5393 BoxLockNode* this_box = locks_list->at(j)->as_AbstractLock()->box_node()->as_BoxLock();
5394 if (box != this_box) {
5395 assert(!this_box->is_eliminated(), "regions with coarsened locks should not be marked as eliminated");
5396 box->set_unbalanced();
5397 this_box->set_unbalanced();
5398 }
5399 }
5400 }
5401 }
5402 }
5403 }
5404
5405 /**
5406 * Remove the speculative part of types and clean up the graph
5407 */
5408 void Compile::remove_speculative_types(PhaseIterGVN &igvn) {
5409 if (UseTypeSpeculation) {
5410 Unique_Node_List worklist;
5411 worklist.push(root());
5412 int modified = 0;
5413 // Go over all type nodes that carry a speculative type, drop the
5414 // speculative part of the type and enqueue the node for an igvn
5415 // which may optimize it out.
5416 for (uint next = 0; next < worklist.size(); ++next) {
5417 Node *n = worklist.at(next);
5418 if (n->is_Type()) {
5419 TypeNode* tn = n->as_Type();
5420 const Type* t = tn->type();
5421 const Type* t_no_spec = t->remove_speculative();
5422 if (t_no_spec != t) {
5423 bool in_hash = igvn.hash_delete(n);
5424 assert(in_hash || n->hash() == Node::NO_HASH, "node should be in igvn hash table");
5425 tn->set_type(t_no_spec);
5426 igvn.hash_insert(n);
5427 igvn._worklist.push(n); // give it a chance to go away
5428 modified++;
5429 }
5430 }
5431 // Iterate over outs - endless loops is unreachable from below
5432 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
5433 Node *m = n->fast_out(i);
5434 if (not_a_node(m)) {
5435 continue;
5436 }
5437 worklist.push(m);
5438 }
5439 }
5440 // Drop the speculative part of all types in the igvn's type table
5441 igvn.remove_speculative_types();
5442 if (modified > 0) {
5443 igvn.optimize();
5444 if (failing()) return;
5445 }
5446 #ifdef ASSERT
5447 // Verify that after the IGVN is over no speculative type has resurfaced
5448 worklist.clear();
5449 worklist.push(root());
5450 for (uint next = 0; next < worklist.size(); ++next) {
5451 Node *n = worklist.at(next);
5452 const Type* t = igvn.type_or_null(n);
5453 assert((t == nullptr) || (t == t->remove_speculative()), "no more speculative types");
5454 if (n->is_Type()) {
5455 t = n->as_Type()->type();
5456 assert(t == t->remove_speculative(), "no more speculative types");
5457 }
5458 // Iterate over outs - endless loops is unreachable from below
5459 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
5460 Node *m = n->fast_out(i);
5461 if (not_a_node(m)) {
5462 continue;
5463 }
5464 worklist.push(m);
5465 }
5466 }
5467 igvn.check_no_speculative_types();
5468 #endif
5469 }
5470 }
5471
5472 Node* Compile::optimize_acmp(PhaseGVN* phase, Node* a, Node* b) {
5473 const TypeInstPtr* ta = phase->type(a)->isa_instptr();
5474 const TypeInstPtr* tb = phase->type(b)->isa_instptr();
5475 if (!EnableValhalla || ta == nullptr || tb == nullptr ||
5476 ta->is_zero_type() || tb->is_zero_type() ||
5477 !ta->can_be_inline_type() || !tb->can_be_inline_type()) {
5478 // Use old acmp if one operand is null or not an inline type
5479 return new CmpPNode(a, b);
5480 } else if (ta->is_inlinetypeptr() || tb->is_inlinetypeptr()) {
5481 // We know that one operand is an inline type. Therefore,
5482 // new acmp will only return true if both operands are nullptr.
5483 // Check if both operands are null by or'ing the oops.
5484 a = phase->transform(new CastP2XNode(nullptr, a));
5485 b = phase->transform(new CastP2XNode(nullptr, b));
5486 a = phase->transform(new OrXNode(a, b));
5487 return new CmpXNode(a, phase->MakeConX(0));
5488 }
5489 // Use new acmp
5490 return nullptr;
5491 }
5492
5493 // Auxiliary methods to support randomized stressing/fuzzing.
5494
5495 void Compile::initialize_stress_seed(const DirectiveSet* directive) {
5496 if (FLAG_IS_DEFAULT(StressSeed) || (FLAG_IS_ERGO(StressSeed) && directive->RepeatCompilationOption)) {
5497 _stress_seed = static_cast<uint>(Ticks::now().nanoseconds());
5498 FLAG_SET_ERGO(StressSeed, _stress_seed);
5499 } else {
5500 _stress_seed = StressSeed;
5501 }
5502 if (_log != nullptr) {
5503 _log->elem("stress_test seed='%u'", _stress_seed);
5504 }
5505 }
5506
5507 int Compile::random() {
5508 _stress_seed = os::next_random(_stress_seed);
5509 return static_cast<int>(_stress_seed);
5510 }
5511
5512 // This method can be called the arbitrary number of times, with current count
5513 // as the argument. The logic allows selecting a single candidate from the
5514 // running list of candidates as follows:
5515 // int count = 0;
5516 // Cand* selected = null;
5517 // while(cand = cand->next()) {
5518 // if (randomized_select(++count)) {
5519 // selected = cand;
5520 // }
5521 // }
5522 //
5523 // Including count equalizes the chances any candidate is "selected".
5524 // This is useful when we don't have the complete list of candidates to choose
5525 // from uniformly. In this case, we need to adjust the randomicity of the
5526 // selection, or else we will end up biasing the selection towards the latter
5527 // candidates.
5528 //
5529 // Quick back-envelope calculation shows that for the list of n candidates
5530 // the equal probability for the candidate to persist as "best" can be
5531 // achieved by replacing it with "next" k-th candidate with the probability
5532 // of 1/k. It can be easily shown that by the end of the run, the
5533 // probability for any candidate is converged to 1/n, thus giving the
5534 // uniform distribution among all the candidates.
5535 //
5536 // We don't care about the domain size as long as (RANDOMIZED_DOMAIN / count) is large.
5537 #define RANDOMIZED_DOMAIN_POW 29
5538 #define RANDOMIZED_DOMAIN (1 << RANDOMIZED_DOMAIN_POW)
5539 #define RANDOMIZED_DOMAIN_MASK ((1 << (RANDOMIZED_DOMAIN_POW + 1)) - 1)
5540 bool Compile::randomized_select(int count) {
5541 assert(count > 0, "only positive");
5542 return (random() & RANDOMIZED_DOMAIN_MASK) < (RANDOMIZED_DOMAIN / count);
5543 }
5544
5545 #ifdef ASSERT
5546 // Failures are geometrically distributed with probability 1/StressBailoutMean.
5547 bool Compile::fail_randomly() {
5548 if ((random() % StressBailoutMean) != 0) {
5549 return false;
5550 }
5551 record_failure("StressBailout");
5552 return true;
5553 }
5554
5555 bool Compile::failure_is_artificial() {
5556 return C->failure_reason_is("StressBailout");
5557 }
5558 #endif
5559
5560 CloneMap& Compile::clone_map() { return _clone_map; }
5561 void Compile::set_clone_map(Dict* d) { _clone_map._dict = d; }
5562
5563 void NodeCloneInfo::dump_on(outputStream* st) const {
5564 st->print(" {%d:%d} ", idx(), gen());
5565 }
5566
5567 void CloneMap::clone(Node* old, Node* nnn, int gen) {
5568 uint64_t val = value(old->_idx);
5569 NodeCloneInfo cio(val);
5570 assert(val != 0, "old node should be in the map");
5571 NodeCloneInfo cin(cio.idx(), gen + cio.gen());
5572 insert(nnn->_idx, cin.get());
5573 #ifndef PRODUCT
5574 if (is_debug()) {
5575 tty->print_cr("CloneMap::clone inserted node %d info {%d:%d} into CloneMap", nnn->_idx, cin.idx(), cin.gen());
5576 }
5577 #endif
5578 }
5579
5580 void CloneMap::verify_insert_and_clone(Node* old, Node* nnn, int gen) {
5581 NodeCloneInfo cio(value(old->_idx));
5582 if (cio.get() == 0) {
5583 cio.set(old->_idx, 0);
5584 insert(old->_idx, cio.get());
5585 #ifndef PRODUCT
5586 if (is_debug()) {
5587 tty->print_cr("CloneMap::verify_insert_and_clone inserted node %d info {%d:%d} into CloneMap", old->_idx, cio.idx(), cio.gen());
5588 }
5589 #endif
5590 }
5591 clone(old, nnn, gen);
5592 }
5593
5594 int CloneMap::max_gen() const {
5595 int g = 0;
5596 DictI di(_dict);
5597 for(; di.test(); ++di) {
5598 int t = gen(di._key);
5599 if (g < t) {
5600 g = t;
5601 #ifndef PRODUCT
5602 if (is_debug()) {
5603 tty->print_cr("CloneMap::max_gen() update max=%d from %d", g, _2_node_idx_t(di._key));
5604 }
5605 #endif
5606 }
5607 }
5608 return g;
5609 }
5610
5611 void CloneMap::dump(node_idx_t key, outputStream* st) const {
5612 uint64_t val = value(key);
5613 if (val != 0) {
5614 NodeCloneInfo ni(val);
5615 ni.dump_on(st);
5616 }
5617 }
5618
5619 void Compile::shuffle_macro_nodes() {
5620 if (_macro_nodes.length() < 2) {
5621 return;
5622 }
5623 for (uint i = _macro_nodes.length() - 1; i >= 1; i--) {
5624 uint j = C->random() % (i + 1);
5625 swap(_macro_nodes.at(i), _macro_nodes.at(j));
5626 }
5627 }
5628
5629 // Move Allocate nodes to the start of the list
5630 void Compile::sort_macro_nodes() {
5631 int count = macro_count();
5632 int allocates = 0;
5633 for (int i = 0; i < count; i++) {
5634 Node* n = macro_node(i);
5635 if (n->is_Allocate()) {
5636 if (i != allocates) {
5637 Node* tmp = macro_node(allocates);
5638 _macro_nodes.at_put(allocates, n);
5639 _macro_nodes.at_put(i, tmp);
5640 }
5641 allocates++;
5642 }
5643 }
5644 }
5645
5646 void Compile::print_method(CompilerPhaseType cpt, int level, Node* n) {
5647 if (failing_internal()) { return; } // failing_internal to not stress bailouts from printing code.
5648 EventCompilerPhase event(UNTIMED);
5649 if (event.should_commit()) {
5650 CompilerEvent::PhaseEvent::post(event, C->_latest_stage_start_counter, cpt, C->_compile_id, level);
5651 }
5652 #ifndef PRODUCT
5653 ResourceMark rm;
5654 stringStream ss;
5655 ss.print_raw(CompilerPhaseTypeHelper::to_description(cpt));
5656 int iter = ++_igv_phase_iter[cpt];
5657 if (iter > 1) {
5658 ss.print(" %d", iter);
5659 }
5660 if (n != nullptr) {
5661 ss.print(": %d %s", n->_idx, NodeClassNames[n->Opcode()]);
5662 if (n->is_Call()) {
5663 CallNode* call = n->as_Call();
5664 if (call->_name != nullptr) {
5665 // E.g. uncommon traps etc.
5666 ss.print(" - %s", call->_name);
5667 } else if (call->is_CallJava()) {
5668 CallJavaNode* call_java = call->as_CallJava();
5669 if (call_java->method() != nullptr) {
5670 ss.print(" -");
5671 call_java->method()->print_short_name(&ss);
5672 }
5673 }
5674 }
5675 }
5676
5677 const char* name = ss.as_string();
5678 if (should_print_igv(level)) {
5679 _igv_printer->print_graph(name);
5680 }
5681 if (should_print_phase(cpt)) {
5682 print_ideal_ir(CompilerPhaseTypeHelper::to_name(cpt));
5683 }
5684 #endif
5685 C->_latest_stage_start_counter.stamp();
5686 }
5687
5688 // Only used from CompileWrapper
5689 void Compile::begin_method() {
5690 #ifndef PRODUCT
5691 if (_method != nullptr && should_print_igv(1)) {
5692 _igv_printer->begin_method();
5693 }
5694 #endif
5695 C->_latest_stage_start_counter.stamp();
5696 }
5697
5698 // Only used from CompileWrapper
5699 void Compile::end_method() {
5700 EventCompilerPhase event(UNTIMED);
5701 if (event.should_commit()) {
5702 CompilerEvent::PhaseEvent::post(event, C->_latest_stage_start_counter, PHASE_END, C->_compile_id, 1);
5703 }
5704
5705 #ifndef PRODUCT
5706 if (_method != nullptr && should_print_igv(1)) {
5707 _igv_printer->end_method();
5708 }
5709 #endif
5710 }
5711
5712 bool Compile::should_print_phase(CompilerPhaseType cpt) {
5713 #ifndef PRODUCT
5714 if (_directive->should_print_phase(cpt)) {
5715 return true;
5716 }
5717 #endif
5718 return false;
5719 }
5720
5721 #ifndef PRODUCT
5722 void Compile::init_igv() {
5723 if (_igv_printer == nullptr) {
5724 _igv_printer = IdealGraphPrinter::printer();
5725 _igv_printer->set_compile(this);
5726 }
5727 }
5728 #endif
5729
5730 bool Compile::should_print_igv(const int level) {
5731 #ifndef PRODUCT
5732 if (PrintIdealGraphLevel < 0) { // disabled by the user
5733 return false;
5734 }
5735
5736 bool need = directive()->IGVPrintLevelOption >= level;
5737 if (need) {
5738 Compile::init_igv();
5739 }
5740 return need;
5741 #else
5742 return false;
5743 #endif
5744 }
5745
5746 #ifndef PRODUCT
5747 IdealGraphPrinter* Compile::_debug_file_printer = nullptr;
5748 IdealGraphPrinter* Compile::_debug_network_printer = nullptr;
5749
5750 // Called from debugger. Prints method to the default file with the default phase name.
5751 // This works regardless of any Ideal Graph Visualizer flags set or not.
5752 void igv_print() {
5753 Compile::current()->igv_print_method_to_file();
5754 }
5755
5756 // Same as igv_print() above but with a specified phase name.
5757 void igv_print(const char* phase_name) {
5758 Compile::current()->igv_print_method_to_file(phase_name);
5759 }
5760
5761 // Called from debugger. Prints method with the default phase name to the default network or the one specified with
5762 // the network flags for the Ideal Graph Visualizer, or to the default file depending on the 'network' argument.
5763 // This works regardless of any Ideal Graph Visualizer flags set or not.
5764 void igv_print(bool network) {
5765 if (network) {
5766 Compile::current()->igv_print_method_to_network();
5767 } else {
5768 Compile::current()->igv_print_method_to_file();
5769 }
5770 }
5771
5772 // Same as igv_print(bool network) above but with a specified phase name.
5773 void igv_print(bool network, const char* phase_name) {
5774 if (network) {
5775 Compile::current()->igv_print_method_to_network(phase_name);
5776 } else {
5777 Compile::current()->igv_print_method_to_file(phase_name);
5778 }
5779 }
5780
5781 // Called from debugger. Normal write to the default _printer. Only works if Ideal Graph Visualizer printing flags are set.
5782 void igv_print_default() {
5783 Compile::current()->print_method(PHASE_DEBUG, 0);
5784 }
5785
5786 // Called from debugger, especially when replaying a trace in which the program state cannot be altered like with rr replay.
5787 // A method is appended to an existing default file with the default phase name. This means that igv_append() must follow
5788 // an earlier igv_print(*) call which sets up the file. This works regardless of any Ideal Graph Visualizer flags set or not.
5789 void igv_append() {
5790 Compile::current()->igv_print_method_to_file("Debug", true);
5791 }
5792
5793 // Same as igv_append() above but with a specified phase name.
5794 void igv_append(const char* phase_name) {
5795 Compile::current()->igv_print_method_to_file(phase_name, true);
5796 }
5797
5798 void Compile::igv_print_method_to_file(const char* phase_name, bool append) {
5799 const char* file_name = "custom_debug.xml";
5800 if (_debug_file_printer == nullptr) {
5801 _debug_file_printer = new IdealGraphPrinter(C, file_name, append);
5802 } else {
5803 _debug_file_printer->update_compiled_method(C->method());
5804 }
5805 tty->print_cr("Method %s to %s", append ? "appended" : "printed", file_name);
5806 _debug_file_printer->print_graph(phase_name);
5807 }
5808
5809 void Compile::igv_print_method_to_network(const char* phase_name) {
5810 ResourceMark rm;
5811 GrowableArray<const Node*> empty_list;
5812 igv_print_graph_to_network(phase_name, empty_list);
5813 }
5814
5815 void Compile::igv_print_graph_to_network(const char* name, GrowableArray<const Node*>& visible_nodes) {
5816 if (_debug_network_printer == nullptr) {
5817 _debug_network_printer = new IdealGraphPrinter(C);
5818 } else {
5819 _debug_network_printer->update_compiled_method(C->method());
5820 }
5821 tty->print_cr("Method printed over network stream to IGV");
5822 _debug_network_printer->print(name, C->root(), visible_nodes);
5823 }
5824 #endif
5825
5826 Node* Compile::narrow_value(BasicType bt, Node* value, const Type* type, PhaseGVN* phase, bool transform_res) {
5827 if (type != nullptr && phase->type(value)->higher_equal(type)) {
5828 return value;
5829 }
5830 Node* result = nullptr;
5831 if (bt == T_BYTE) {
5832 result = phase->transform(new LShiftINode(value, phase->intcon(24)));
5833 result = new RShiftINode(result, phase->intcon(24));
5834 } else if (bt == T_BOOLEAN) {
5835 result = new AndINode(value, phase->intcon(0xFF));
5836 } else if (bt == T_CHAR) {
5837 result = new AndINode(value,phase->intcon(0xFFFF));
5838 } else if (bt == T_FLOAT) {
5839 result = new MoveI2FNode(value);
5840 } else {
5841 assert(bt == T_SHORT, "unexpected narrow type");
5842 result = phase->transform(new LShiftINode(value, phase->intcon(16)));
5843 result = new RShiftINode(result, phase->intcon(16));
5844 }
5845 if (transform_res) {
5846 result = phase->transform(result);
5847 }
5848 return result;
5849 }
5850
5851 void Compile::record_method_not_compilable_oom() {
5852 record_method_not_compilable(CompilationMemoryStatistic::failure_reason_memlimit());
5853 }