1 /*
2 * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "c1/c1_CFGPrinter.hpp"
27 #include "c1/c1_Canonicalizer.hpp"
28 #include "c1/c1_Compilation.hpp"
29 #include "c1/c1_GraphBuilder.hpp"
30 #include "c1/c1_InstructionPrinter.hpp"
31 #include "ci/ciCallSite.hpp"
32 #include "ci/ciField.hpp"
33 #include "ci/ciFlatArrayKlass.hpp"
34 #include "ci/ciInlineKlass.hpp"
35 #include "ci/ciKlass.hpp"
36 #include "ci/ciMemberName.hpp"
37 #include "ci/ciSymbols.hpp"
38 #include "ci/ciUtilities.inline.hpp"
39 #include "classfile/javaClasses.hpp"
40 #include "compiler/compilationPolicy.hpp"
41 #include "compiler/compileBroker.hpp"
42 #include "compiler/compilerEvent.hpp"
43 #include "interpreter/bytecode.hpp"
44 #include "jfr/jfrEvents.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "runtime/sharedRuntime.hpp"
48 #include "runtime/vm_version.hpp"
49 #include "utilities/bitMap.inline.hpp"
50 #include "utilities/checkedCast.hpp"
51 #include "utilities/powerOfTwo.hpp"
52 #include "utilities/macros.hpp"
53 #if INCLUDE_JFR
54 #include "jfr/jfr.hpp"
55 #endif
56
57 class BlockListBuilder {
58 private:
59 Compilation* _compilation;
60 IRScope* _scope;
61
62 BlockList _blocks; // internal list of all blocks
63 BlockList* _bci2block; // mapping from bci to blocks for GraphBuilder
64 GrowableArray<BlockList> _bci2block_successors; // Mapping bcis to their blocks successors while we dont have a blockend
65
66 // fields used by mark_loops
67 ResourceBitMap _active; // for iteration of control flow graph
68 ResourceBitMap _visited; // for iteration of control flow graph
69 GrowableArray<ResourceBitMap> _loop_map; // caches the information if a block is contained in a loop
70 int _next_loop_index; // next free loop number
71 int _next_block_number; // for reverse postorder numbering of blocks
72 int _block_id_start;
73
74 int bit_number(int block_id) const { return block_id - _block_id_start; }
75 // accessors
76 Compilation* compilation() const { return _compilation; }
77 IRScope* scope() const { return _scope; }
78 ciMethod* method() const { return scope()->method(); }
79 XHandlers* xhandlers() const { return scope()->xhandlers(); }
80
81 // unified bailout support
82 void bailout(const char* msg) const { compilation()->bailout(msg); }
83 bool bailed_out() const { return compilation()->bailed_out(); }
84
85 // helper functions
86 BlockBegin* make_block_at(int bci, BlockBegin* predecessor);
87 void handle_exceptions(BlockBegin* current, int cur_bci);
88 void handle_jsr(BlockBegin* current, int sr_bci, int next_bci);
89 void store_one(BlockBegin* current, int local);
90 void store_two(BlockBegin* current, int local);
91 void set_entries(int osr_bci);
92 void set_leaders();
93
94 void make_loop_header(BlockBegin* block);
95 void mark_loops();
96 BitMap& mark_loops(BlockBegin* b, bool in_subroutine);
97
98 // debugging
99 #ifndef PRODUCT
100 void print();
101 #endif
102
103 int number_of_successors(BlockBegin* block);
104 BlockBegin* successor_at(BlockBegin* block, int i);
105 void add_successor(BlockBegin* block, BlockBegin* sux);
106 bool is_successor(BlockBegin* block, BlockBegin* sux);
107
108 public:
109 // creation
110 BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci);
111
112 // accessors for GraphBuilder
113 BlockList* bci2block() const { return _bci2block; }
114 };
115
116
117 // Implementation of BlockListBuilder
118
119 BlockListBuilder::BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci)
120 : _compilation(compilation)
121 , _scope(scope)
122 , _blocks(16)
123 , _bci2block(new BlockList(scope->method()->code_size(), nullptr))
124 , _bci2block_successors(scope->method()->code_size())
125 , _active() // size not known yet
126 , _visited() // size not known yet
127 , _loop_map() // size not known yet
128 , _next_loop_index(0)
129 , _next_block_number(0)
130 , _block_id_start(0)
131 {
132 set_entries(osr_bci);
133 set_leaders();
134 CHECK_BAILOUT();
135
136 mark_loops();
137 NOT_PRODUCT(if (PrintInitialBlockList) print());
138
139 // _bci2block still contains blocks with _end == null and > 0 sux in _bci2block_successors.
140
141 #ifndef PRODUCT
142 if (PrintCFGToFile) {
143 stringStream title;
144 title.print("BlockListBuilder ");
145 scope->method()->print_name(&title);
146 CFGPrinter::print_cfg(_bci2block, title.freeze(), false, false);
147 }
148 #endif
149 }
150
151
152 void BlockListBuilder::set_entries(int osr_bci) {
153 // generate start blocks
154 BlockBegin* std_entry = make_block_at(0, nullptr);
155 if (scope()->caller() == nullptr) {
156 std_entry->set(BlockBegin::std_entry_flag);
157 }
158 if (osr_bci != -1) {
159 BlockBegin* osr_entry = make_block_at(osr_bci, nullptr);
160 osr_entry->set(BlockBegin::osr_entry_flag);
161 }
162
163 // generate exception entry blocks
164 XHandlers* list = xhandlers();
165 const int n = list->length();
166 for (int i = 0; i < n; i++) {
167 XHandler* h = list->handler_at(i);
168 BlockBegin* entry = make_block_at(h->handler_bci(), nullptr);
169 entry->set(BlockBegin::exception_entry_flag);
170 h->set_entry_block(entry);
171 }
172 }
173
174
175 BlockBegin* BlockListBuilder::make_block_at(int cur_bci, BlockBegin* predecessor) {
176 assert(method()->bci_block_start().at(cur_bci), "wrong block starts of MethodLivenessAnalyzer");
177
178 BlockBegin* block = _bci2block->at(cur_bci);
179 if (block == nullptr) {
180 block = new BlockBegin(cur_bci);
181 block->init_stores_to_locals(method()->max_locals());
182 _bci2block->at_put(cur_bci, block);
183 _bci2block_successors.at_put_grow(cur_bci, BlockList());
184 _blocks.append(block);
185
186 assert(predecessor == nullptr || predecessor->bci() < cur_bci, "targets for backward branches must already exist");
187 }
188
189 if (predecessor != nullptr) {
190 if (block->is_set(BlockBegin::exception_entry_flag)) {
191 BAILOUT_("Exception handler can be reached by both normal and exceptional control flow", block);
192 }
193
194 add_successor(predecessor, block);
195 block->increment_total_preds();
196 }
197
198 return block;
199 }
200
201
202 inline void BlockListBuilder::store_one(BlockBegin* current, int local) {
203 current->stores_to_locals().set_bit(local);
204 }
205 inline void BlockListBuilder::store_two(BlockBegin* current, int local) {
206 store_one(current, local);
207 store_one(current, local + 1);
208 }
209
210
211 void BlockListBuilder::handle_exceptions(BlockBegin* current, int cur_bci) {
212 // Draws edges from a block to its exception handlers
213 XHandlers* list = xhandlers();
214 const int n = list->length();
215
216 for (int i = 0; i < n; i++) {
217 XHandler* h = list->handler_at(i);
218
219 if (h->covers(cur_bci)) {
220 BlockBegin* entry = h->entry_block();
221 assert(entry != nullptr && entry == _bci2block->at(h->handler_bci()), "entry must be set");
222 assert(entry->is_set(BlockBegin::exception_entry_flag), "flag must be set");
223
224 // add each exception handler only once
225 if(!is_successor(current, entry)) {
226 add_successor(current, entry);
227 entry->increment_total_preds();
228 }
229
230 // stop when reaching catchall
231 if (h->catch_type() == 0) break;
232 }
233 }
234 }
235
236 void BlockListBuilder::handle_jsr(BlockBegin* current, int sr_bci, int next_bci) {
237 if (next_bci < method()->code_size()) {
238 // start a new block after jsr-bytecode and link this block into cfg
239 make_block_at(next_bci, current);
240 }
241
242 // start a new block at the subroutine entry at mark it with special flag
243 BlockBegin* sr_block = make_block_at(sr_bci, current);
244 if (!sr_block->is_set(BlockBegin::subroutine_entry_flag)) {
245 sr_block->set(BlockBegin::subroutine_entry_flag);
246 }
247 }
248
249
250 void BlockListBuilder::set_leaders() {
251 bool has_xhandlers = xhandlers()->has_handlers();
252 BlockBegin* current = nullptr;
253
254 // The information which bci starts a new block simplifies the analysis
255 // Without it, backward branches could jump to a bci where no block was created
256 // during bytecode iteration. This would require the creation of a new block at the
257 // branch target and a modification of the successor lists.
258 const BitMap& bci_block_start = method()->bci_block_start();
259
260 int end_bci = method()->code_size();
261
262 ciBytecodeStream s(method());
263 while (s.next() != ciBytecodeStream::EOBC()) {
264 int cur_bci = s.cur_bci();
265
266 if (bci_block_start.at(cur_bci)) {
267 current = make_block_at(cur_bci, current);
268 }
269 assert(current != nullptr, "must have current block");
270
271 if (has_xhandlers && GraphBuilder::can_trap(method(), s.cur_bc())) {
272 handle_exceptions(current, cur_bci);
273 }
274
275 switch (s.cur_bc()) {
276 // track stores to local variables for selective creation of phi functions
277 case Bytecodes::_iinc: store_one(current, s.get_index()); break;
278 case Bytecodes::_istore: store_one(current, s.get_index()); break;
279 case Bytecodes::_lstore: store_two(current, s.get_index()); break;
280 case Bytecodes::_fstore: store_one(current, s.get_index()); break;
281 case Bytecodes::_dstore: store_two(current, s.get_index()); break;
282 case Bytecodes::_astore: store_one(current, s.get_index()); break;
283 case Bytecodes::_istore_0: store_one(current, 0); break;
284 case Bytecodes::_istore_1: store_one(current, 1); break;
285 case Bytecodes::_istore_2: store_one(current, 2); break;
286 case Bytecodes::_istore_3: store_one(current, 3); break;
287 case Bytecodes::_lstore_0: store_two(current, 0); break;
288 case Bytecodes::_lstore_1: store_two(current, 1); break;
289 case Bytecodes::_lstore_2: store_two(current, 2); break;
290 case Bytecodes::_lstore_3: store_two(current, 3); break;
291 case Bytecodes::_fstore_0: store_one(current, 0); break;
292 case Bytecodes::_fstore_1: store_one(current, 1); break;
293 case Bytecodes::_fstore_2: store_one(current, 2); break;
294 case Bytecodes::_fstore_3: store_one(current, 3); break;
295 case Bytecodes::_dstore_0: store_two(current, 0); break;
296 case Bytecodes::_dstore_1: store_two(current, 1); break;
297 case Bytecodes::_dstore_2: store_two(current, 2); break;
298 case Bytecodes::_dstore_3: store_two(current, 3); break;
299 case Bytecodes::_astore_0: store_one(current, 0); break;
300 case Bytecodes::_astore_1: store_one(current, 1); break;
301 case Bytecodes::_astore_2: store_one(current, 2); break;
302 case Bytecodes::_astore_3: store_one(current, 3); break;
303
304 // track bytecodes that affect the control flow
305 case Bytecodes::_athrow: // fall through
306 case Bytecodes::_ret: // fall through
307 case Bytecodes::_ireturn: // fall through
308 case Bytecodes::_lreturn: // fall through
309 case Bytecodes::_freturn: // fall through
310 case Bytecodes::_dreturn: // fall through
311 case Bytecodes::_areturn: // fall through
312 case Bytecodes::_return:
313 current = nullptr;
314 break;
315
316 case Bytecodes::_ifeq: // fall through
317 case Bytecodes::_ifne: // fall through
318 case Bytecodes::_iflt: // fall through
319 case Bytecodes::_ifge: // fall through
320 case Bytecodes::_ifgt: // fall through
321 case Bytecodes::_ifle: // fall through
322 case Bytecodes::_if_icmpeq: // fall through
323 case Bytecodes::_if_icmpne: // fall through
324 case Bytecodes::_if_icmplt: // fall through
325 case Bytecodes::_if_icmpge: // fall through
326 case Bytecodes::_if_icmpgt: // fall through
327 case Bytecodes::_if_icmple: // fall through
328 case Bytecodes::_if_acmpeq: // fall through
329 case Bytecodes::_if_acmpne: // fall through
330 case Bytecodes::_ifnull: // fall through
331 case Bytecodes::_ifnonnull:
332 if (s.next_bci() < end_bci) {
333 make_block_at(s.next_bci(), current);
334 }
335 make_block_at(s.get_dest(), current);
336 current = nullptr;
337 break;
338
339 case Bytecodes::_goto:
340 make_block_at(s.get_dest(), current);
341 current = nullptr;
342 break;
343
344 case Bytecodes::_goto_w:
345 make_block_at(s.get_far_dest(), current);
346 current = nullptr;
347 break;
348
349 case Bytecodes::_jsr:
350 handle_jsr(current, s.get_dest(), s.next_bci());
351 current = nullptr;
352 break;
353
354 case Bytecodes::_jsr_w:
355 handle_jsr(current, s.get_far_dest(), s.next_bci());
356 current = nullptr;
357 break;
358
359 case Bytecodes::_tableswitch: {
360 // set block for each case
361 Bytecode_tableswitch sw(&s);
362 int l = sw.length();
363 for (int i = 0; i < l; i++) {
364 make_block_at(cur_bci + sw.dest_offset_at(i), current);
365 }
366 make_block_at(cur_bci + sw.default_offset(), current);
367 current = nullptr;
368 break;
369 }
370
371 case Bytecodes::_lookupswitch: {
372 // set block for each case
373 Bytecode_lookupswitch sw(&s);
374 int l = sw.number_of_pairs();
375 for (int i = 0; i < l; i++) {
376 make_block_at(cur_bci + sw.pair_at(i).offset(), current);
377 }
378 make_block_at(cur_bci + sw.default_offset(), current);
379 current = nullptr;
380 break;
381 }
382
383 default:
384 break;
385 }
386 }
387 }
388
389
390 void BlockListBuilder::mark_loops() {
391 ResourceMark rm;
392
393 const int number_of_blocks = _blocks.length();
394 _active.initialize(number_of_blocks);
395 _visited.initialize(number_of_blocks);
396 _loop_map = GrowableArray<ResourceBitMap>(number_of_blocks, number_of_blocks, ResourceBitMap());
397 for (int i = 0; i < number_of_blocks; i++) {
398 _loop_map.at(i).initialize(number_of_blocks);
399 }
400 _next_loop_index = 0;
401 _next_block_number = _blocks.length();
402
403 // The loop detection algorithm works as follows:
404 // - We maintain the _loop_map, where for each block we have a bitmap indicating which loops contain this block.
405 // - The CFG is recursively traversed (depth-first) and if we detect a loop, we assign the loop a unique number that is stored
406 // in the bitmap associated with the loop header block. Until we return back through that loop header the bitmap contains
407 // only a single bit corresponding to the loop number.
408 // - The bit is then propagated for all the blocks in the loop after we exit them (post-order). There could be multiple bits
409 // of course in case of nested loops.
410 // - When we exit the loop header we remove that single bit and assign the real loop state for it.
411 // - Now, the tricky part here is how we detect irreducible loops. In the algorithm above the loop state bits
412 // are propagated to the predecessors. If we encounter an irreducible loop (a loop with multiple heads) we would see
413 // a node with some loop bit set that would then propagate back and be never cleared because we would
414 // never go back through the original loop header. Therefore if there are any irreducible loops the bits in the states
415 // for these loops are going to propagate back to the root.
416 BlockBegin* start = _bci2block->at(0);
417 _block_id_start = start->block_id();
418 BitMap& loop_state = mark_loops(start, false);
419 if (!loop_state.is_empty()) {
420 compilation()->set_has_irreducible_loops(true);
421 }
422 assert(_next_block_number >= 0, "invalid block numbers");
423
424 // Remove dangling Resource pointers before the ResourceMark goes out-of-scope.
425 _active.resize(0);
426 _visited.resize(0);
427 _loop_map.clear();
428 }
429
430 void BlockListBuilder::make_loop_header(BlockBegin* block) {
431 int block_id = block->block_id();
432 int block_bit = bit_number(block_id);
433 if (block->is_set(BlockBegin::exception_entry_flag)) {
434 // exception edges may look like loops but don't mark them as such
435 // since it screws up block ordering.
436 return;
437 }
438 if (!block->is_set(BlockBegin::parser_loop_header_flag)) {
439 block->set(BlockBegin::parser_loop_header_flag);
440
441 assert(_loop_map.at(block_bit).is_empty(), "must not be set yet");
442 assert(0 <= _next_loop_index && _next_loop_index < _loop_map.length(), "_next_loop_index is too large");
443 _loop_map.at(block_bit).set_bit(_next_loop_index++);
444 } else {
445 // block already marked as loop header
446 assert(_loop_map.at(block_bit).count_one_bits() == 1, "exactly one bit must be set");
447 }
448 }
449
450 BitMap& BlockListBuilder::mark_loops(BlockBegin* block, bool in_subroutine) {
451 int block_id = block->block_id();
452 int block_bit = bit_number(block_id);
453 if (_visited.at(block_bit)) {
454 if (_active.at(block_bit)) {
455 // reached block via backward branch
456 make_loop_header(block);
457 }
458 // return cached loop information for this block
459 return _loop_map.at(block_bit);
460 }
461
462 if (block->is_set(BlockBegin::subroutine_entry_flag)) {
463 in_subroutine = true;
464 }
465
466 // set active and visited bits before successors are processed
467 _visited.set_bit(block_bit);
468 _active.set_bit(block_bit);
469
470 ResourceMark rm;
471 ResourceBitMap loop_state(_loop_map.length());
472 for (int i = number_of_successors(block) - 1; i >= 0; i--) {
473 BlockBegin* sux = successor_at(block, i);
474 // recursively process all successors
475 loop_state.set_union(mark_loops(sux, in_subroutine));
476 }
477
478 // clear active-bit after all successors are processed
479 _active.clear_bit(block_bit);
480
481 // reverse-post-order numbering of all blocks
482 block->set_depth_first_number(_next_block_number);
483 _next_block_number--;
484
485 if (!loop_state.is_empty() || in_subroutine ) {
486 // block is contained at least in one loop, so phi functions are necessary
487 // phi functions are also necessary for all locals stored in a subroutine
488 scope()->requires_phi_function().set_union(block->stores_to_locals());
489 }
490
491 if (block->is_set(BlockBegin::parser_loop_header_flag)) {
492 BitMap& header_loop_state = _loop_map.at(block_bit);
493 assert(header_loop_state.count_one_bits() == 1, "exactly one bit must be set");
494 // remove the bit with the loop number for the state (header is outside of the loop)
495 loop_state.set_difference(header_loop_state);
496 }
497
498 // cache and return loop information for this block
499 _loop_map.at(block_bit).set_from(loop_state);
500 return _loop_map.at(block_bit);
501 }
502
503 inline int BlockListBuilder::number_of_successors(BlockBegin* block)
504 {
505 assert(_bci2block_successors.length() > block->bci(), "sux must exist");
506 return _bci2block_successors.at(block->bci()).length();
507 }
508
509 inline BlockBegin* BlockListBuilder::successor_at(BlockBegin* block, int i)
510 {
511 assert(_bci2block_successors.length() > block->bci(), "sux must exist");
512 return _bci2block_successors.at(block->bci()).at(i);
513 }
514
515 inline void BlockListBuilder::add_successor(BlockBegin* block, BlockBegin* sux)
516 {
517 assert(_bci2block_successors.length() > block->bci(), "sux must exist");
518 _bci2block_successors.at(block->bci()).append(sux);
519 }
520
521 inline bool BlockListBuilder::is_successor(BlockBegin* block, BlockBegin* sux) {
522 assert(_bci2block_successors.length() > block->bci(), "sux must exist");
523 return _bci2block_successors.at(block->bci()).contains(sux);
524 }
525
526 #ifndef PRODUCT
527
528 int compare_depth_first(BlockBegin** a, BlockBegin** b) {
529 return (*a)->depth_first_number() - (*b)->depth_first_number();
530 }
531
532 void BlockListBuilder::print() {
533 tty->print("----- initial block list of BlockListBuilder for method ");
534 method()->print_short_name();
535 tty->cr();
536
537 // better readability if blocks are sorted in processing order
538 _blocks.sort(compare_depth_first);
539
540 for (int i = 0; i < _blocks.length(); i++) {
541 BlockBegin* cur = _blocks.at(i);
542 tty->print("%4d: B%-4d bci: %-4d preds: %-4d ", cur->depth_first_number(), cur->block_id(), cur->bci(), cur->total_preds());
543
544 tty->print(cur->is_set(BlockBegin::std_entry_flag) ? " std" : " ");
545 tty->print(cur->is_set(BlockBegin::osr_entry_flag) ? " osr" : " ");
546 tty->print(cur->is_set(BlockBegin::exception_entry_flag) ? " ex" : " ");
547 tty->print(cur->is_set(BlockBegin::subroutine_entry_flag) ? " sr" : " ");
548 tty->print(cur->is_set(BlockBegin::parser_loop_header_flag) ? " lh" : " ");
549
550 if (number_of_successors(cur) > 0) {
551 tty->print(" sux: ");
552 for (int j = 0; j < number_of_successors(cur); j++) {
553 BlockBegin* sux = successor_at(cur, j);
554 tty->print("B%d ", sux->block_id());
555 }
556 }
557 tty->cr();
558 }
559 }
560
561 #endif
562
563
564 // A simple growable array of Values indexed by ciFields
565 class FieldBuffer: public CompilationResourceObj {
566 private:
567 GrowableArray<Value> _values;
568
569 public:
570 FieldBuffer() {}
571
572 void kill() {
573 _values.trunc_to(0);
574 }
575
576 Value at(ciField* field) {
577 assert(field->holder()->is_loaded(), "must be a loaded field");
578 int offset = field->offset_in_bytes();
579 if (offset < _values.length()) {
580 return _values.at(offset);
581 } else {
582 return nullptr;
583 }
584 }
585
586 void at_put(ciField* field, Value value) {
587 assert(field->holder()->is_loaded(), "must be a loaded field");
588 int offset = field->offset_in_bytes();
589 _values.at_put_grow(offset, value, nullptr);
590 }
591
592 };
593
594
595 // MemoryBuffer is fairly simple model of the current state of memory.
596 // It partitions memory into several pieces. The first piece is
597 // generic memory where little is known about the owner of the memory.
598 // This is conceptually represented by the tuple <O, F, V> which says
599 // that the field F of object O has value V. This is flattened so
600 // that F is represented by the offset of the field and the parallel
601 // arrays _objects and _values are used for O and V. Loads of O.F can
602 // simply use V. Newly allocated objects are kept in a separate list
603 // along with a parallel array for each object which represents the
604 // current value of its fields. Stores of the default value to fields
605 // which have never been stored to before are eliminated since they
606 // are redundant. Once newly allocated objects are stored into
607 // another object or they are passed out of the current compile they
608 // are treated like generic memory.
609
610 class MemoryBuffer: public CompilationResourceObj {
611 private:
612 FieldBuffer _values;
613 GrowableArray<Value> _objects;
614 GrowableArray<Value> _newobjects;
615 GrowableArray<FieldBuffer*> _fields;
616
617 public:
618 MemoryBuffer() {}
619
620 StoreField* store(StoreField* st) {
621 if (!EliminateFieldAccess) {
622 return st;
623 }
624
625 Value object = st->obj();
626 Value value = st->value();
627 ciField* field = st->field();
628 if (field->holder()->is_loaded()) {
629 int offset = field->offset_in_bytes();
630 int index = _newobjects.find(object);
631 if (index != -1) {
632 // newly allocated object with no other stores performed on this field
633 FieldBuffer* buf = _fields.at(index);
634 if (buf->at(field) == nullptr && is_default_value(value)) {
635 #ifndef PRODUCT
636 if (PrintIRDuringConstruction && Verbose) {
637 tty->print_cr("Eliminated store for object %d:", index);
638 st->print_line();
639 }
640 #endif
641 return nullptr;
642 } else {
643 buf->at_put(field, value);
644 }
645 } else {
646 _objects.at_put_grow(offset, object, nullptr);
647 _values.at_put(field, value);
648 }
649
650 store_value(value);
651 } else {
652 // if we held onto field names we could alias based on names but
653 // we don't know what's being stored to so kill it all.
654 kill();
655 }
656 return st;
657 }
658
659
660 // return true if this value correspond to the default value of a field.
661 bool is_default_value(Value value) {
662 Constant* con = value->as_Constant();
663 if (con) {
664 switch (con->type()->tag()) {
665 case intTag: return con->type()->as_IntConstant()->value() == 0;
666 case longTag: return con->type()->as_LongConstant()->value() == 0;
667 case floatTag: return jint_cast(con->type()->as_FloatConstant()->value()) == 0;
668 case doubleTag: return jlong_cast(con->type()->as_DoubleConstant()->value()) == jlong_cast(0);
669 case objectTag: return con->type() == objectNull;
670 default: ShouldNotReachHere();
671 }
672 }
673 return false;
674 }
675
676
677 // return either the actual value of a load or the load itself
678 Value load(LoadField* load) {
679 if (!EliminateFieldAccess) {
680 return load;
681 }
682
683 if (strict_fp_requires_explicit_rounding && load->type()->is_float_kind()) {
684 #ifdef IA32
685 if (UseSSE < 2) {
686 // can't skip load since value might get rounded as a side effect
687 return load;
688 }
689 #else
690 Unimplemented();
691 #endif // IA32
692 }
693
694 ciField* field = load->field();
695 Value object = load->obj();
696 if (field->holder()->is_loaded() && !field->is_volatile()) {
697 int offset = field->offset_in_bytes();
698 Value result = nullptr;
699 int index = _newobjects.find(object);
700 if (index != -1) {
701 result = _fields.at(index)->at(field);
702 } else if (_objects.at_grow(offset, nullptr) == object) {
703 result = _values.at(field);
704 }
705 if (result != nullptr) {
706 #ifndef PRODUCT
707 if (PrintIRDuringConstruction && Verbose) {
708 tty->print_cr("Eliminated load: ");
709 load->print_line();
710 }
711 #endif
712 assert(result->type()->tag() == load->type()->tag(), "wrong types");
713 return result;
714 }
715 }
716 return load;
717 }
718
719 // Record this newly allocated object
720 void new_instance(NewInstance* object) {
721 int index = _newobjects.length();
722 _newobjects.append(object);
723 if (_fields.at_grow(index, nullptr) == nullptr) {
724 _fields.at_put(index, new FieldBuffer());
725 } else {
726 _fields.at(index)->kill();
727 }
728 }
729
730 void store_value(Value value) {
731 int index = _newobjects.find(value);
732 if (index != -1) {
733 // stored a newly allocated object into another object.
734 // Assume we've lost track of it as separate slice of memory.
735 // We could do better by keeping track of whether individual
736 // fields could alias each other.
737 _newobjects.remove_at(index);
738 // pull out the field info and store it at the end up the list
739 // of field info list to be reused later.
740 _fields.append(_fields.at(index));
741 _fields.remove_at(index);
742 }
743 }
744
745 void kill() {
746 _newobjects.trunc_to(0);
747 _objects.trunc_to(0);
748 _values.kill();
749 }
750 };
751
752
753 // Implementation of GraphBuilder's ScopeData
754
755 GraphBuilder::ScopeData::ScopeData(ScopeData* parent)
756 : _parent(parent)
757 , _bci2block(nullptr)
758 , _scope(nullptr)
759 , _has_handler(false)
760 , _stream(nullptr)
761 , _work_list(nullptr)
762 , _caller_stack_size(-1)
763 , _continuation(nullptr)
764 , _parsing_jsr(false)
765 , _jsr_xhandlers(nullptr)
766 , _num_returns(0)
767 , _cleanup_block(nullptr)
768 , _cleanup_return_prev(nullptr)
769 , _cleanup_state(nullptr)
770 , _ignore_return(false)
771 {
772 if (parent != nullptr) {
773 _max_inline_size = (intx) ((float) NestedInliningSizeRatio * (float) parent->max_inline_size() / 100.0f);
774 } else {
775 _max_inline_size = C1MaxInlineSize;
776 }
777 if (_max_inline_size < C1MaxTrivialSize) {
778 _max_inline_size = C1MaxTrivialSize;
779 }
780 }
781
782
783 void GraphBuilder::kill_all() {
784 if (UseLocalValueNumbering) {
785 vmap()->kill_all();
786 }
787 _memory->kill();
788 }
789
790
791 BlockBegin* GraphBuilder::ScopeData::block_at(int bci) {
792 if (parsing_jsr()) {
793 // It is necessary to clone all blocks associated with a
794 // subroutine, including those for exception handlers in the scope
795 // of the method containing the jsr (because those exception
796 // handlers may contain ret instructions in some cases).
797 BlockBegin* block = bci2block()->at(bci);
798 if (block != nullptr && block == parent()->bci2block()->at(bci)) {
799 BlockBegin* new_block = new BlockBegin(block->bci());
800 if (PrintInitialBlockList) {
801 tty->print_cr("CFG: cloned block %d (bci %d) as block %d for jsr",
802 block->block_id(), block->bci(), new_block->block_id());
803 }
804 // copy data from cloned blocked
805 new_block->set_depth_first_number(block->depth_first_number());
806 if (block->is_set(BlockBegin::parser_loop_header_flag)) new_block->set(BlockBegin::parser_loop_header_flag);
807 // Preserve certain flags for assertion checking
808 if (block->is_set(BlockBegin::subroutine_entry_flag)) new_block->set(BlockBegin::subroutine_entry_flag);
809 if (block->is_set(BlockBegin::exception_entry_flag)) new_block->set(BlockBegin::exception_entry_flag);
810
811 // copy was_visited_flag to allow early detection of bailouts
812 // if a block that is used in a jsr has already been visited before,
813 // it is shared between the normal control flow and a subroutine
814 // BlockBegin::try_merge returns false when the flag is set, this leads
815 // to a compilation bailout
816 if (block->is_set(BlockBegin::was_visited_flag)) new_block->set(BlockBegin::was_visited_flag);
817
818 bci2block()->at_put(bci, new_block);
819 block = new_block;
820 }
821 return block;
822 } else {
823 return bci2block()->at(bci);
824 }
825 }
826
827
828 XHandlers* GraphBuilder::ScopeData::xhandlers() const {
829 if (_jsr_xhandlers == nullptr) {
830 assert(!parsing_jsr(), "");
831 return scope()->xhandlers();
832 }
833 assert(parsing_jsr(), "");
834 return _jsr_xhandlers;
835 }
836
837
838 void GraphBuilder::ScopeData::set_scope(IRScope* scope) {
839 _scope = scope;
840 bool parent_has_handler = false;
841 if (parent() != nullptr) {
842 parent_has_handler = parent()->has_handler();
843 }
844 _has_handler = parent_has_handler || scope->xhandlers()->has_handlers();
845 }
846
847
848 void GraphBuilder::ScopeData::set_inline_cleanup_info(BlockBegin* block,
849 Instruction* return_prev,
850 ValueStack* return_state) {
851 _cleanup_block = block;
852 _cleanup_return_prev = return_prev;
853 _cleanup_state = return_state;
854 }
855
856
857 void GraphBuilder::ScopeData::add_to_work_list(BlockBegin* block) {
858 if (_work_list == nullptr) {
859 _work_list = new BlockList();
860 }
861
862 if (!block->is_set(BlockBegin::is_on_work_list_flag)) {
863 // Do not start parsing the continuation block while in a
864 // sub-scope
865 if (parsing_jsr()) {
866 if (block == jsr_continuation()) {
867 return;
868 }
869 } else {
870 if (block == continuation()) {
871 return;
872 }
873 }
874 block->set(BlockBegin::is_on_work_list_flag);
875 _work_list->push(block);
876
877 sort_top_into_worklist(_work_list, block);
878 }
879 }
880
881
882 void GraphBuilder::sort_top_into_worklist(BlockList* worklist, BlockBegin* top) {
883 assert(worklist->top() == top, "");
884 // sort block descending into work list
885 const int dfn = top->depth_first_number();
886 assert(dfn != -1, "unknown depth first number");
887 int i = worklist->length()-2;
888 while (i >= 0) {
889 BlockBegin* b = worklist->at(i);
890 if (b->depth_first_number() < dfn) {
891 worklist->at_put(i+1, b);
892 } else {
893 break;
894 }
895 i --;
896 }
897 if (i >= -1) worklist->at_put(i + 1, top);
898 }
899
900
901 BlockBegin* GraphBuilder::ScopeData::remove_from_work_list() {
902 if (is_work_list_empty()) {
903 return nullptr;
904 }
905 return _work_list->pop();
906 }
907
908
909 bool GraphBuilder::ScopeData::is_work_list_empty() const {
910 return (_work_list == nullptr || _work_list->length() == 0);
911 }
912
913
914 void GraphBuilder::ScopeData::setup_jsr_xhandlers() {
915 assert(parsing_jsr(), "");
916 // clone all the exception handlers from the scope
917 XHandlers* handlers = new XHandlers(scope()->xhandlers());
918 const int n = handlers->length();
919 for (int i = 0; i < n; i++) {
920 // The XHandlers need to be adjusted to dispatch to the cloned
921 // handler block instead of the default one but the synthetic
922 // unlocker needs to be handled specially. The synthetic unlocker
923 // should be left alone since there can be only one and all code
924 // should dispatch to the same one.
925 XHandler* h = handlers->handler_at(i);
926 assert(h->handler_bci() != SynchronizationEntryBCI, "must be real");
927 h->set_entry_block(block_at(h->handler_bci()));
928 }
929 _jsr_xhandlers = handlers;
930 }
931
932
933 int GraphBuilder::ScopeData::num_returns() {
934 if (parsing_jsr()) {
935 return parent()->num_returns();
936 }
937 return _num_returns;
938 }
939
940
941 void GraphBuilder::ScopeData::incr_num_returns() {
942 if (parsing_jsr()) {
943 parent()->incr_num_returns();
944 } else {
945 ++_num_returns;
946 }
947 }
948
949
950 // Implementation of GraphBuilder
951
952 #define INLINE_BAILOUT(msg) { inline_bailout(msg); return false; }
953
954
955 void GraphBuilder::load_constant() {
956 ciConstant con = stream()->get_constant();
957 if (con.is_valid()) {
958 ValueType* t = illegalType;
959 ValueStack* patch_state = nullptr;
960 switch (con.basic_type()) {
961 case T_BOOLEAN: t = new IntConstant (con.as_boolean()); break;
962 case T_BYTE : t = new IntConstant (con.as_byte ()); break;
963 case T_CHAR : t = new IntConstant (con.as_char ()); break;
964 case T_SHORT : t = new IntConstant (con.as_short ()); break;
965 case T_INT : t = new IntConstant (con.as_int ()); break;
966 case T_LONG : t = new LongConstant (con.as_long ()); break;
967 case T_FLOAT : t = new FloatConstant (con.as_float ()); break;
968 case T_DOUBLE : t = new DoubleConstant(con.as_double ()); break;
969 case T_ARRAY : // fall-through
970 case T_OBJECT : {
971 ciObject* obj = con.as_object();
972 if (!obj->is_loaded() || (PatchALot && !stream()->is_string_constant())) {
973 // A Class, MethodType, MethodHandle, Dynamic, or String.
974 patch_state = copy_state_before();
975 t = new ObjectConstant(obj);
976 } else {
977 // Might be a Class, MethodType, MethodHandle, or Dynamic constant
978 // result, which might turn out to be an array.
979 if (obj->is_null_object()) {
980 t = objectNull;
981 } else if (obj->is_array()) {
982 t = new ArrayConstant(obj->as_array());
983 } else {
984 t = new InstanceConstant(obj->as_instance());
985 }
986 }
987 break;
988 }
989 default: ShouldNotReachHere();
990 }
991 Value x;
992 if (patch_state != nullptr) {
993 // Arbitrary memory effects from running BSM or class loading (using custom loader) during linkage.
994 bool kills_memory = stream()->is_dynamic_constant() ||
995 (!stream()->is_string_constant() && !method()->holder()->has_trusted_loader());
996 x = new Constant(t, patch_state, kills_memory);
997 } else {
998 x = new Constant(t);
999 }
1000
1001 // Unbox the value at runtime, if needed.
1002 // ConstantDynamic entry can be of a primitive type, but it is cached in boxed form.
1003 if (patch_state != nullptr) {
1004 int cp_index = stream()->get_constant_pool_index();
1005 BasicType type = stream()->get_basic_type_for_constant_at(cp_index);
1006 if (is_java_primitive(type)) {
1007 ciInstanceKlass* box_klass = ciEnv::current()->get_box_klass_for_primitive_type(type);
1008 assert(box_klass->is_loaded(), "sanity");
1009 int offset = java_lang_boxing_object::value_offset(type);
1010 ciField* value_field = box_klass->get_field_by_offset(offset, false /*is_static*/);
1011 x = new LoadField(append(x), offset, value_field, false /*is_static*/, patch_state, false /*needs_patching*/);
1012 t = as_ValueType(type);
1013 } else {
1014 assert(is_reference_type(type), "not a reference: %s", type2name(type));
1015 }
1016 }
1017
1018 push(t, append(x));
1019 } else {
1020 BAILOUT("could not resolve a constant");
1021 }
1022 }
1023
1024
1025 void GraphBuilder::load_local(ValueType* type, int index) {
1026 Value x = state()->local_at(index);
1027 assert(x != nullptr && !x->type()->is_illegal(), "access of illegal local variable");
1028 push(type, x);
1029 }
1030
1031
1032 void GraphBuilder::store_local(ValueType* type, int index) {
1033 Value x = pop(type);
1034 store_local(state(), x, index);
1035 }
1036
1037
1038 void GraphBuilder::store_local(ValueStack* state, Value x, int index) {
1039 if (parsing_jsr()) {
1040 // We need to do additional tracking of the location of the return
1041 // address for jsrs since we don't handle arbitrary jsr/ret
1042 // constructs. Here we are figuring out in which circumstances we
1043 // need to bail out.
1044 if (x->type()->is_address()) {
1045 scope_data()->set_jsr_return_address_local(index);
1046
1047 // Also check parent jsrs (if any) at this time to see whether
1048 // they are using this local. We don't handle skipping over a
1049 // ret.
1050 for (ScopeData* cur_scope_data = scope_data()->parent();
1051 cur_scope_data != nullptr && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
1052 cur_scope_data = cur_scope_data->parent()) {
1053 if (cur_scope_data->jsr_return_address_local() == index) {
1054 BAILOUT("subroutine overwrites return address from previous subroutine");
1055 }
1056 }
1057 } else if (index == scope_data()->jsr_return_address_local()) {
1058 scope_data()->set_jsr_return_address_local(-1);
1059 }
1060 }
1061
1062 state->store_local(index, round_fp(x));
1063 }
1064
1065
1066 void GraphBuilder::load_indexed(BasicType type) {
1067 // In case of in block code motion in range check elimination
1068 ValueStack* state_before = nullptr;
1069 int array_idx = state()->stack_size() - 2;
1070 if (type == T_OBJECT && state()->stack_at(array_idx)->maybe_flat_array()) {
1071 // Save the entire state and re-execute on deopt when accessing flat arrays
1072 state_before = copy_state_before();
1073 state_before->set_should_reexecute(true);
1074 } else {
1075 state_before = copy_state_indexed_access();
1076 }
1077 compilation()->set_has_access_indexed(true);
1078 Value index = ipop();
1079 Value array = apop();
1080 Value length = nullptr;
1081 if (CSEArrayLength ||
1082 (array->as_Constant() != nullptr) ||
1083 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
1084 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant()) ||
1085 (array->as_NewMultiArray() && array->as_NewMultiArray()->dims()->at(0)->type()->is_constant())) {
1086 length = append(new ArrayLength(array, state_before));
1087 }
1088
1089 bool need_membar = false;
1090 LoadIndexed* load_indexed = nullptr;
1091 Instruction* result = nullptr;
1092 if (array->is_loaded_flat_array()) {
1093 ciType* array_type = array->declared_type();
1094 ciInlineKlass* elem_klass = array_type->as_flat_array_klass()->element_klass()->as_inline_klass();
1095
1096 bool can_delay_access = false;
1097 ciBytecodeStream s(method());
1098 s.force_bci(bci());
1099 s.next();
1100 if (s.cur_bc() == Bytecodes::_getfield) {
1101 bool will_link;
1102 ciField* next_field = s.get_field(will_link);
1103 bool next_needs_patching = !next_field->holder()->is_initialized() ||
1104 !next_field->will_link(method(), Bytecodes::_getfield) ||
1105 PatchALot;
1106 can_delay_access = C1UseDelayedFlattenedFieldReads && !next_needs_patching;
1107 }
1108 if (can_delay_access) {
1109 // potentially optimizable array access, storing information for delayed decision
1110 LoadIndexed* li = new LoadIndexed(array, index, length, type, state_before);
1111 DelayedLoadIndexed* dli = new DelayedLoadIndexed(li, state_before);
1112 li->set_delayed(dli);
1113 set_pending_load_indexed(dli);
1114 return; // Nothing else to do for now
1115 } else {
1116 if (elem_klass->is_empty()) {
1117 // No need to create a new instance, the default instance will be used instead
1118 load_indexed = new LoadIndexed(array, index, length, type, state_before);
1119 apush(append(load_indexed));
1120 } else {
1121 NewInstance* new_instance = new NewInstance(elem_klass, state_before, false, true);
1122 _memory->new_instance(new_instance);
1123 apush(append_split(new_instance));
1124 load_indexed = new LoadIndexed(array, index, length, type, state_before);
1125 load_indexed->set_vt(new_instance);
1126 // The LoadIndexed node will initialise this instance by copying from
1127 // the flat field. Ensure these stores are visible before any
1128 // subsequent store that publishes this reference.
1129 need_membar = true;
1130 }
1131 }
1132 } else {
1133 load_indexed = new LoadIndexed(array, index, length, type, state_before);
1134 if (profile_array_accesses() && is_reference_type(type)) {
1135 compilation()->set_would_profile(true);
1136 load_indexed->set_should_profile(true);
1137 load_indexed->set_profiled_method(method());
1138 load_indexed->set_profiled_bci(bci());
1139 }
1140 }
1141 result = append(load_indexed);
1142 if (need_membar) {
1143 append(new MemBar(lir_membar_storestore));
1144 }
1145 assert(!load_indexed->should_profile() || load_indexed == result, "should not be optimized out");
1146 if (!array->is_loaded_flat_array()) {
1147 push(as_ValueType(type), result);
1148 }
1149 }
1150
1151
1152 void GraphBuilder::store_indexed(BasicType type) {
1153 // In case of in block code motion in range check elimination
1154 ValueStack* state_before = nullptr;
1155 int array_idx = state()->stack_size() - 3;
1156 if (type == T_OBJECT && state()->stack_at(array_idx)->maybe_flat_array()) {
1157 // Save the entire state and re-execute on deopt when accessing flat arrays
1158 state_before = copy_state_before();
1159 state_before->set_should_reexecute(true);
1160 } else {
1161 state_before = copy_state_indexed_access();
1162 }
1163 compilation()->set_has_access_indexed(true);
1164 Value value = pop(as_ValueType(type));
1165 Value index = ipop();
1166 Value array = apop();
1167 Value length = nullptr;
1168 if (CSEArrayLength ||
1169 (array->as_Constant() != nullptr) ||
1170 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
1171 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant()) ||
1172 (array->as_NewMultiArray() && array->as_NewMultiArray()->dims()->at(0)->type()->is_constant())) {
1173 length = append(new ArrayLength(array, state_before));
1174 }
1175 ciType* array_type = array->declared_type();
1176 bool check_boolean = false;
1177 if (array_type != nullptr) {
1178 if (array_type->is_loaded() &&
1179 array_type->as_array_klass()->element_type()->basic_type() == T_BOOLEAN) {
1180 assert(type == T_BYTE, "boolean store uses bastore");
1181 Value mask = append(new Constant(new IntConstant(1)));
1182 value = append(new LogicOp(Bytecodes::_iand, value, mask));
1183 }
1184 } else if (type == T_BYTE) {
1185 check_boolean = true;
1186 }
1187
1188 StoreIndexed* store_indexed = new StoreIndexed(array, index, length, type, value, state_before, check_boolean);
1189 if (profile_array_accesses() && is_reference_type(type) && !array->is_loaded_flat_array()) {
1190 compilation()->set_would_profile(true);
1191 store_indexed->set_should_profile(true);
1192 store_indexed->set_profiled_method(method());
1193 store_indexed->set_profiled_bci(bci());
1194 }
1195 Instruction* result = append(store_indexed);
1196 assert(!store_indexed->should_profile() || store_indexed == result, "should not be optimized out");
1197 _memory->store_value(value);
1198 }
1199
1200 void GraphBuilder::stack_op(Bytecodes::Code code) {
1201 switch (code) {
1202 case Bytecodes::_pop:
1203 { Value w = state()->raw_pop();
1204 }
1205 break;
1206 case Bytecodes::_pop2:
1207 { Value w1 = state()->raw_pop();
1208 Value w2 = state()->raw_pop();
1209 }
1210 break;
1211 case Bytecodes::_dup:
1212 { Value w = state()->raw_pop();
1213 state()->raw_push(w);
1214 state()->raw_push(w);
1215 }
1216 break;
1217 case Bytecodes::_dup_x1:
1218 { Value w1 = state()->raw_pop();
1219 Value w2 = state()->raw_pop();
1220 state()->raw_push(w1);
1221 state()->raw_push(w2);
1222 state()->raw_push(w1);
1223 }
1224 break;
1225 case Bytecodes::_dup_x2:
1226 { Value w1 = state()->raw_pop();
1227 Value w2 = state()->raw_pop();
1228 Value w3 = state()->raw_pop();
1229 state()->raw_push(w1);
1230 state()->raw_push(w3);
1231 state()->raw_push(w2);
1232 state()->raw_push(w1);
1233 }
1234 break;
1235 case Bytecodes::_dup2:
1236 { Value w1 = state()->raw_pop();
1237 Value w2 = state()->raw_pop();
1238 state()->raw_push(w2);
1239 state()->raw_push(w1);
1240 state()->raw_push(w2);
1241 state()->raw_push(w1);
1242 }
1243 break;
1244 case Bytecodes::_dup2_x1:
1245 { Value w1 = state()->raw_pop();
1246 Value w2 = state()->raw_pop();
1247 Value w3 = state()->raw_pop();
1248 state()->raw_push(w2);
1249 state()->raw_push(w1);
1250 state()->raw_push(w3);
1251 state()->raw_push(w2);
1252 state()->raw_push(w1);
1253 }
1254 break;
1255 case Bytecodes::_dup2_x2:
1256 { Value w1 = state()->raw_pop();
1257 Value w2 = state()->raw_pop();
1258 Value w3 = state()->raw_pop();
1259 Value w4 = state()->raw_pop();
1260 state()->raw_push(w2);
1261 state()->raw_push(w1);
1262 state()->raw_push(w4);
1263 state()->raw_push(w3);
1264 state()->raw_push(w2);
1265 state()->raw_push(w1);
1266 }
1267 break;
1268 case Bytecodes::_swap:
1269 { Value w1 = state()->raw_pop();
1270 Value w2 = state()->raw_pop();
1271 state()->raw_push(w1);
1272 state()->raw_push(w2);
1273 }
1274 break;
1275 default:
1276 ShouldNotReachHere();
1277 break;
1278 }
1279 }
1280
1281
1282 void GraphBuilder::arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* state_before) {
1283 Value y = pop(type);
1284 Value x = pop(type);
1285 Value res = new ArithmeticOp(code, x, y, state_before);
1286 // Note: currently single-precision floating-point rounding on Intel is handled at the LIRGenerator level
1287 res = append(res);
1288 res = round_fp(res);
1289 push(type, res);
1290 }
1291
1292
1293 void GraphBuilder::negate_op(ValueType* type) {
1294 push(type, append(new NegateOp(pop(type))));
1295 }
1296
1297
1298 void GraphBuilder::shift_op(ValueType* type, Bytecodes::Code code) {
1299 Value s = ipop();
1300 Value x = pop(type);
1301 // try to simplify
1302 // Note: This code should go into the canonicalizer as soon as it can
1303 // can handle canonicalized forms that contain more than one node.
1304 if (CanonicalizeNodes && code == Bytecodes::_iushr) {
1305 // pattern: x >>> s
1306 IntConstant* s1 = s->type()->as_IntConstant();
1307 if (s1 != nullptr) {
1308 // pattern: x >>> s1, with s1 constant
1309 ShiftOp* l = x->as_ShiftOp();
1310 if (l != nullptr && l->op() == Bytecodes::_ishl) {
1311 // pattern: (a << b) >>> s1
1312 IntConstant* s0 = l->y()->type()->as_IntConstant();
1313 if (s0 != nullptr) {
1314 // pattern: (a << s0) >>> s1
1315 const int s0c = s0->value() & 0x1F; // only the low 5 bits are significant for shifts
1316 const int s1c = s1->value() & 0x1F; // only the low 5 bits are significant for shifts
1317 if (s0c == s1c) {
1318 if (s0c == 0) {
1319 // pattern: (a << 0) >>> 0 => simplify to: a
1320 ipush(l->x());
1321 } else {
1322 // pattern: (a << s0c) >>> s0c => simplify to: a & m, with m constant
1323 assert(0 < s0c && s0c < BitsPerInt, "adjust code below to handle corner cases");
1324 const int m = checked_cast<int>(right_n_bits(BitsPerInt - s0c));
1325 Value s = append(new Constant(new IntConstant(m)));
1326 ipush(append(new LogicOp(Bytecodes::_iand, l->x(), s)));
1327 }
1328 return;
1329 }
1330 }
1331 }
1332 }
1333 }
1334 // could not simplify
1335 push(type, append(new ShiftOp(code, x, s)));
1336 }
1337
1338
1339 void GraphBuilder::logic_op(ValueType* type, Bytecodes::Code code) {
1340 Value y = pop(type);
1341 Value x = pop(type);
1342 push(type, append(new LogicOp(code, x, y)));
1343 }
1344
1345
1346 void GraphBuilder::compare_op(ValueType* type, Bytecodes::Code code) {
1347 ValueStack* state_before = copy_state_before();
1348 Value y = pop(type);
1349 Value x = pop(type);
1350 ipush(append(new CompareOp(code, x, y, state_before)));
1351 }
1352
1353
1354 void GraphBuilder::convert(Bytecodes::Code op, BasicType from, BasicType to) {
1355 push(as_ValueType(to), append(new Convert(op, pop(as_ValueType(from)), as_ValueType(to))));
1356 }
1357
1358
1359 void GraphBuilder::increment() {
1360 int index = stream()->get_index();
1361 int delta = stream()->is_wide() ? (signed short)Bytes::get_Java_u2(stream()->cur_bcp() + 4) : (signed char)(stream()->cur_bcp()[2]);
1362 load_local(intType, index);
1363 ipush(append(new Constant(new IntConstant(delta))));
1364 arithmetic_op(intType, Bytecodes::_iadd);
1365 store_local(intType, index);
1366 }
1367
1368
1369 void GraphBuilder::_goto(int from_bci, int to_bci) {
1370 Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci);
1371 if (is_profiling()) {
1372 compilation()->set_would_profile(true);
1373 x->set_profiled_bci(bci());
1374 if (profile_branches()) {
1375 x->set_profiled_method(method());
1376 x->set_should_profile(true);
1377 }
1378 }
1379 append(x);
1380 }
1381
1382
1383 void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) {
1384 BlockBegin* tsux = block_at(stream()->get_dest());
1385 BlockBegin* fsux = block_at(stream()->next_bci());
1386 bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci();
1387
1388 bool subst_check = false;
1389 if (EnableValhalla && (stream()->cur_bc() == Bytecodes::_if_acmpeq || stream()->cur_bc() == Bytecodes::_if_acmpne)) {
1390 ValueType* left_vt = x->type();
1391 ValueType* right_vt = y->type();
1392 if (left_vt->is_object()) {
1393 assert(right_vt->is_object(), "must be");
1394 ciKlass* left_klass = x->as_loaded_klass_or_null();
1395 ciKlass* right_klass = y->as_loaded_klass_or_null();
1396
1397 if (left_klass == nullptr || right_klass == nullptr) {
1398 // The klass is still unloaded, or came from a Phi node. Go slow case;
1399 subst_check = true;
1400 } else if (left_klass->can_be_inline_klass() || right_klass->can_be_inline_klass()) {
1401 // Either operand may be a value object, but we're not sure. Go slow case;
1402 subst_check = true;
1403 } else {
1404 // No need to do substitutability check
1405 }
1406 }
1407 }
1408 if ((stream()->cur_bc() == Bytecodes::_if_acmpeq || stream()->cur_bc() == Bytecodes::_if_acmpne) &&
1409 is_profiling() && profile_branches()) {
1410 compilation()->set_would_profile(true);
1411 append(new ProfileACmpTypes(method(), bci(), x, y));
1412 }
1413
1414 // In case of loop invariant code motion or predicate insertion
1415 // before the body of a loop the state is needed
1416 Instruction *i = append(new If(x, cond, false, y, tsux, fsux, (is_bb || compilation()->is_optimistic() || subst_check) ? state_before : nullptr, is_bb, subst_check));
1417
1418 assert(i->as_Goto() == nullptr ||
1419 (i->as_Goto()->sux_at(0) == tsux && i->as_Goto()->is_safepoint() == tsux->bci() < stream()->cur_bci()) ||
1420 (i->as_Goto()->sux_at(0) == fsux && i->as_Goto()->is_safepoint() == fsux->bci() < stream()->cur_bci()),
1421 "safepoint state of Goto returned by canonicalizer incorrect");
1422
1423 if (is_profiling()) {
1424 If* if_node = i->as_If();
1425 if (if_node != nullptr) {
1426 // Note that we'd collect profile data in this method if we wanted it.
1427 compilation()->set_would_profile(true);
1428 // At level 2 we need the proper bci to count backedges
1429 if_node->set_profiled_bci(bci());
1430 if (profile_branches()) {
1431 // Successors can be rotated by the canonicalizer, check for this case.
1432 if_node->set_profiled_method(method());
1433 if_node->set_should_profile(true);
1434 if (if_node->tsux() == fsux) {
1435 if_node->set_swapped(true);
1436 }
1437 }
1438 return;
1439 }
1440
1441 // Check if this If was reduced to Goto.
1442 Goto *goto_node = i->as_Goto();
1443 if (goto_node != nullptr) {
1444 compilation()->set_would_profile(true);
1445 goto_node->set_profiled_bci(bci());
1446 if (profile_branches()) {
1447 goto_node->set_profiled_method(method());
1448 goto_node->set_should_profile(true);
1449 // Find out which successor is used.
1450 if (goto_node->default_sux() == tsux) {
1451 goto_node->set_direction(Goto::taken);
1452 } else if (goto_node->default_sux() == fsux) {
1453 goto_node->set_direction(Goto::not_taken);
1454 } else {
1455 ShouldNotReachHere();
1456 }
1457 }
1458 return;
1459 }
1460 }
1461 }
1462
1463
1464 void GraphBuilder::if_zero(ValueType* type, If::Condition cond) {
1465 Value y = append(new Constant(intZero));
1466 ValueStack* state_before = copy_state_before();
1467 Value x = ipop();
1468 if_node(x, cond, y, state_before);
1469 }
1470
1471
1472 void GraphBuilder::if_null(ValueType* type, If::Condition cond) {
1473 Value y = append(new Constant(objectNull));
1474 ValueStack* state_before = copy_state_before();
1475 Value x = apop();
1476 if_node(x, cond, y, state_before);
1477 }
1478
1479
1480 void GraphBuilder::if_same(ValueType* type, If::Condition cond) {
1481 ValueStack* state_before = copy_state_before();
1482 Value y = pop(type);
1483 Value x = pop(type);
1484 if_node(x, cond, y, state_before);
1485 }
1486
1487
1488 void GraphBuilder::jsr(int dest) {
1489 // We only handle well-formed jsrs (those which are "block-structured").
1490 // If the bytecodes are strange (jumping out of a jsr block) then we
1491 // might end up trying to re-parse a block containing a jsr which
1492 // has already been activated. Watch for this case and bail out.
1493 for (ScopeData* cur_scope_data = scope_data();
1494 cur_scope_data != nullptr && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
1495 cur_scope_data = cur_scope_data->parent()) {
1496 if (cur_scope_data->jsr_entry_bci() == dest) {
1497 BAILOUT("too-complicated jsr/ret structure");
1498 }
1499 }
1500
1501 push(addressType, append(new Constant(new AddressConstant(next_bci()))));
1502 if (!try_inline_jsr(dest)) {
1503 return; // bailed out while parsing and inlining subroutine
1504 }
1505 }
1506
1507
1508 void GraphBuilder::ret(int local_index) {
1509 if (!parsing_jsr()) BAILOUT("ret encountered while not parsing subroutine");
1510
1511 if (local_index != scope_data()->jsr_return_address_local()) {
1512 BAILOUT("can not handle complicated jsr/ret constructs");
1513 }
1514
1515 // Rets simply become (NON-SAFEPOINT) gotos to the jsr continuation
1516 append(new Goto(scope_data()->jsr_continuation(), false));
1517 }
1518
1519
1520 void GraphBuilder::table_switch() {
1521 Bytecode_tableswitch sw(stream());
1522 const int l = sw.length();
1523 if (CanonicalizeNodes && l == 1 && compilation()->env()->comp_level() != CompLevel_full_profile) {
1524 // total of 2 successors => use If instead of switch
1525 // Note: This code should go into the canonicalizer as soon as it can
1526 // can handle canonicalized forms that contain more than one node.
1527 Value key = append(new Constant(new IntConstant(sw.low_key())));
1528 BlockBegin* tsux = block_at(bci() + sw.dest_offset_at(0));
1529 BlockBegin* fsux = block_at(bci() + sw.default_offset());
1530 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
1531 // In case of loop invariant code motion or predicate insertion
1532 // before the body of a loop the state is needed
1533 ValueStack* state_before = copy_state_if_bb(is_bb);
1534 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
1535 } else {
1536 // collect successors
1537 BlockList* sux = new BlockList(l + 1, nullptr);
1538 int i;
1539 bool has_bb = false;
1540 for (i = 0; i < l; i++) {
1541 sux->at_put(i, block_at(bci() + sw.dest_offset_at(i)));
1542 if (sw.dest_offset_at(i) < 0) has_bb = true;
1543 }
1544 // add default successor
1545 if (sw.default_offset() < 0) has_bb = true;
1546 sux->at_put(i, block_at(bci() + sw.default_offset()));
1547 // In case of loop invariant code motion or predicate insertion
1548 // before the body of a loop the state is needed
1549 ValueStack* state_before = copy_state_if_bb(has_bb);
1550 Instruction* res = append(new TableSwitch(ipop(), sux, sw.low_key(), state_before, has_bb));
1551 #ifdef ASSERT
1552 if (res->as_Goto()) {
1553 for (i = 0; i < l; i++) {
1554 if (sux->at(i) == res->as_Goto()->sux_at(0)) {
1555 assert(res->as_Goto()->is_safepoint() == sw.dest_offset_at(i) < 0, "safepoint state of Goto returned by canonicalizer incorrect");
1556 }
1557 }
1558 }
1559 #endif
1560 }
1561 }
1562
1563
1564 void GraphBuilder::lookup_switch() {
1565 Bytecode_lookupswitch sw(stream());
1566 const int l = sw.number_of_pairs();
1567 if (CanonicalizeNodes && l == 1 && compilation()->env()->comp_level() != CompLevel_full_profile) {
1568 // total of 2 successors => use If instead of switch
1569 // Note: This code should go into the canonicalizer as soon as it can
1570 // can handle canonicalized forms that contain more than one node.
1571 // simplify to If
1572 LookupswitchPair pair = sw.pair_at(0);
1573 Value key = append(new Constant(new IntConstant(pair.match())));
1574 BlockBegin* tsux = block_at(bci() + pair.offset());
1575 BlockBegin* fsux = block_at(bci() + sw.default_offset());
1576 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
1577 // In case of loop invariant code motion or predicate insertion
1578 // before the body of a loop the state is needed
1579 ValueStack* state_before = copy_state_if_bb(is_bb);;
1580 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
1581 } else {
1582 // collect successors & keys
1583 BlockList* sux = new BlockList(l + 1, nullptr);
1584 intArray* keys = new intArray(l, l, 0);
1585 int i;
1586 bool has_bb = false;
1587 for (i = 0; i < l; i++) {
1588 LookupswitchPair pair = sw.pair_at(i);
1589 if (pair.offset() < 0) has_bb = true;
1590 sux->at_put(i, block_at(bci() + pair.offset()));
1591 keys->at_put(i, pair.match());
1592 }
1593 // add default successor
1594 if (sw.default_offset() < 0) has_bb = true;
1595 sux->at_put(i, block_at(bci() + sw.default_offset()));
1596 // In case of loop invariant code motion or predicate insertion
1597 // before the body of a loop the state is needed
1598 ValueStack* state_before = copy_state_if_bb(has_bb);
1599 Instruction* res = append(new LookupSwitch(ipop(), sux, keys, state_before, has_bb));
1600 #ifdef ASSERT
1601 if (res->as_Goto()) {
1602 for (i = 0; i < l; i++) {
1603 if (sux->at(i) == res->as_Goto()->sux_at(0)) {
1604 assert(res->as_Goto()->is_safepoint() == sw.pair_at(i).offset() < 0, "safepoint state of Goto returned by canonicalizer incorrect");
1605 }
1606 }
1607 }
1608 #endif
1609 }
1610 }
1611
1612 void GraphBuilder::call_register_finalizer() {
1613 // If the receiver requires finalization then emit code to perform
1614 // the registration on return.
1615
1616 // Gather some type information about the receiver
1617 Value receiver = state()->local_at(0);
1618 assert(receiver != nullptr, "must have a receiver");
1619 ciType* declared_type = receiver->declared_type();
1620 ciType* exact_type = receiver->exact_type();
1621 if (exact_type == nullptr &&
1622 receiver->as_Local() &&
1623 receiver->as_Local()->java_index() == 0) {
1624 ciInstanceKlass* ik = compilation()->method()->holder();
1625 if (ik->is_final()) {
1626 exact_type = ik;
1627 } else if (UseCHA && !(ik->has_subklass() || ik->is_interface())) {
1628 // test class is leaf class
1629 compilation()->dependency_recorder()->assert_leaf_type(ik);
1630 exact_type = ik;
1631 } else {
1632 declared_type = ik;
1633 }
1634 }
1635
1636 // see if we know statically that registration isn't required
1637 bool needs_check = true;
1638 if (exact_type != nullptr) {
1639 needs_check = exact_type->as_instance_klass()->has_finalizer();
1640 } else if (declared_type != nullptr) {
1641 ciInstanceKlass* ik = declared_type->as_instance_klass();
1642 if (!Dependencies::has_finalizable_subclass(ik)) {
1643 compilation()->dependency_recorder()->assert_has_no_finalizable_subclasses(ik);
1644 needs_check = false;
1645 }
1646 }
1647
1648 if (needs_check) {
1649 // Perform the registration of finalizable objects.
1650 ValueStack* state_before = copy_state_for_exception();
1651 load_local(objectType, 0);
1652 append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init,
1653 state()->pop_arguments(1),
1654 true, state_before, true));
1655 }
1656 }
1657
1658
1659 void GraphBuilder::method_return(Value x, bool ignore_return) {
1660 if (RegisterFinalizersAtInit &&
1661 method()->intrinsic_id() == vmIntrinsics::_Object_init) {
1662 call_register_finalizer();
1663 }
1664
1665 // The conditions for a memory barrier are described in Parse::do_exits().
1666 bool need_mem_bar = false;
1667 if (method()->is_object_constructor() &&
1668 (scope()->wrote_final() ||
1669 (AlwaysSafeConstructors && scope()->wrote_fields()) ||
1670 (support_IRIW_for_not_multiple_copy_atomic_cpu && scope()->wrote_volatile()))) {
1671 need_mem_bar = true;
1672 }
1673
1674 BasicType bt = method()->return_type()->basic_type();
1675 switch (bt) {
1676 case T_BYTE:
1677 {
1678 Value shift = append(new Constant(new IntConstant(24)));
1679 x = append(new ShiftOp(Bytecodes::_ishl, x, shift));
1680 x = append(new ShiftOp(Bytecodes::_ishr, x, shift));
1681 break;
1682 }
1683 case T_SHORT:
1684 {
1685 Value shift = append(new Constant(new IntConstant(16)));
1686 x = append(new ShiftOp(Bytecodes::_ishl, x, shift));
1687 x = append(new ShiftOp(Bytecodes::_ishr, x, shift));
1688 break;
1689 }
1690 case T_CHAR:
1691 {
1692 Value mask = append(new Constant(new IntConstant(0xFFFF)));
1693 x = append(new LogicOp(Bytecodes::_iand, x, mask));
1694 break;
1695 }
1696 case T_BOOLEAN:
1697 {
1698 Value mask = append(new Constant(new IntConstant(1)));
1699 x = append(new LogicOp(Bytecodes::_iand, x, mask));
1700 break;
1701 }
1702 default:
1703 break;
1704 }
1705
1706 // Check to see whether we are inlining. If so, Return
1707 // instructions become Gotos to the continuation point.
1708 if (continuation() != nullptr) {
1709
1710 int invoke_bci = state()->caller_state()->bci();
1711
1712 if (x != nullptr && !ignore_return) {
1713 ciMethod* caller = state()->scope()->caller()->method();
1714 Bytecodes::Code invoke_raw_bc = caller->raw_code_at_bci(invoke_bci);
1715 if (invoke_raw_bc == Bytecodes::_invokehandle || invoke_raw_bc == Bytecodes::_invokedynamic) {
1716 ciType* declared_ret_type = caller->get_declared_signature_at_bci(invoke_bci)->return_type();
1717 if (declared_ret_type->is_klass() && x->exact_type() == nullptr &&
1718 x->declared_type() != declared_ret_type && declared_ret_type != compilation()->env()->Object_klass()) {
1719 x = append(new TypeCast(declared_ret_type->as_klass(), x, copy_state_before()));
1720 }
1721 }
1722 }
1723
1724 assert(!method()->is_synchronized() || InlineSynchronizedMethods, "can not inline synchronized methods yet");
1725
1726 if (compilation()->env()->dtrace_method_probes()) {
1727 // Report exit from inline methods
1728 Values* args = new Values(1);
1729 args->push(append(new Constant(new MethodConstant(method()))));
1730 append(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args));
1731 }
1732
1733 // If the inlined method is synchronized, the monitor must be
1734 // released before we jump to the continuation block.
1735 if (method()->is_synchronized()) {
1736 assert(state()->locks_size() == 1, "receiver must be locked here");
1737 monitorexit(state()->lock_at(0), SynchronizationEntryBCI);
1738 }
1739
1740 if (need_mem_bar) {
1741 append(new MemBar(lir_membar_storestore));
1742 }
1743
1744 // State at end of inlined method is the state of the caller
1745 // without the method parameters on stack, including the
1746 // return value, if any, of the inlined method on operand stack.
1747 set_state(state()->caller_state()->copy_for_parsing());
1748 if (x != nullptr) {
1749 if (!ignore_return) {
1750 state()->push(x->type(), x);
1751 }
1752 if (profile_return() && x->type()->is_object_kind()) {
1753 ciMethod* caller = state()->scope()->method();
1754 profile_return_type(x, method(), caller, invoke_bci);
1755 }
1756 }
1757 Goto* goto_callee = new Goto(continuation(), false);
1758
1759 // See whether this is the first return; if so, store off some
1760 // of the state for later examination
1761 if (num_returns() == 0) {
1762 set_inline_cleanup_info();
1763 }
1764
1765 // The current bci() is in the wrong scope, so use the bci() of
1766 // the continuation point.
1767 append_with_bci(goto_callee, scope_data()->continuation()->bci());
1768 incr_num_returns();
1769 return;
1770 }
1771
1772 state()->truncate_stack(0);
1773 if (method()->is_synchronized()) {
1774 // perform the unlocking before exiting the method
1775 Value receiver;
1776 if (!method()->is_static()) {
1777 receiver = _initial_state->local_at(0);
1778 } else {
1779 receiver = append(new Constant(new ClassConstant(method()->holder())));
1780 }
1781 append_split(new MonitorExit(receiver, state()->unlock()));
1782 }
1783
1784 if (need_mem_bar) {
1785 append(new MemBar(lir_membar_storestore));
1786 }
1787
1788 assert(!ignore_return, "Ignoring return value works only for inlining");
1789 append(new Return(x));
1790 }
1791
1792 Value GraphBuilder::make_constant(ciConstant field_value, ciField* field) {
1793 if (!field_value.is_valid()) return nullptr;
1794
1795 BasicType field_type = field_value.basic_type();
1796 ValueType* value = as_ValueType(field_value);
1797
1798 // Attach dimension info to stable arrays.
1799 if (FoldStableValues &&
1800 field->is_stable() && field_type == T_ARRAY && !field_value.is_null_or_zero()) {
1801 ciArray* array = field_value.as_object()->as_array();
1802 jint dimension = field->type()->as_array_klass()->dimension();
1803 value = new StableArrayConstant(array, dimension);
1804 }
1805
1806 switch (field_type) {
1807 case T_ARRAY:
1808 case T_OBJECT:
1809 if (field_value.as_object()->should_be_constant()) {
1810 return new Constant(value);
1811 }
1812 return nullptr; // Not a constant.
1813 default:
1814 return new Constant(value);
1815 }
1816 }
1817
1818 void GraphBuilder::copy_inline_content(ciInlineKlass* vk, Value src, int src_off, Value dest, int dest_off, ValueStack* state_before, ciField* enclosing_field) {
1819 for (int i = 0; i < vk->nof_nonstatic_fields(); i++) {
1820 ciField* inner_field = vk->nonstatic_field_at(i);
1821 assert(!inner_field->is_flat(), "the iteration over nested fields is handled by the loop itself");
1822 int off = inner_field->offset_in_bytes() - vk->first_field_offset();
1823 LoadField* load = new LoadField(src, src_off + off, inner_field, false, state_before, false);
1824 Value replacement = append(load);
1825 StoreField* store = new StoreField(dest, dest_off + off, inner_field, replacement, false, state_before, false);
1826 store->set_enclosing_field(enclosing_field);
1827 append(store);
1828 }
1829 }
1830
1831 void GraphBuilder::access_field(Bytecodes::Code code) {
1832 bool will_link;
1833 ciField* field = stream()->get_field(will_link);
1834 ciInstanceKlass* holder = field->holder();
1835 BasicType field_type = field->type()->basic_type();
1836 ValueType* type = as_ValueType(field_type);
1837
1838 // call will_link again to determine if the field is valid.
1839 const bool needs_patching = !holder->is_loaded() ||
1840 !field->will_link(method(), code) ||
1841 (!field->is_flat() && PatchALot);
1842
1843 ValueStack* state_before = nullptr;
1844 if (!holder->is_initialized() || needs_patching) {
1845 // save state before instruction for debug info when
1846 // deoptimization happens during patching
1847 state_before = copy_state_before();
1848 }
1849
1850 Value obj = nullptr;
1851 if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) {
1852 if (state_before != nullptr) {
1853 // build a patching constant
1854 obj = new Constant(new InstanceConstant(holder->java_mirror()), state_before);
1855 } else {
1856 obj = new Constant(new InstanceConstant(holder->java_mirror()));
1857 }
1858 }
1859
1860 if (field->is_final() && code == Bytecodes::_putfield) {
1861 scope()->set_wrote_final();
1862 }
1863
1864 if (code == Bytecodes::_putfield) {
1865 scope()->set_wrote_fields();
1866 if (field->is_volatile()) {
1867 scope()->set_wrote_volatile();
1868 }
1869 }
1870
1871 int offset = !needs_patching ? field->offset_in_bytes() : -1;
1872 switch (code) {
1873 case Bytecodes::_getstatic: {
1874 // check for compile-time constants, i.e., initialized static final fields
1875 Value constant = nullptr;
1876 if (field->is_static_constant() && !PatchALot) {
1877 ciConstant field_value = field->constant_value();
1878 assert(!field->is_stable() || !field_value.is_null_or_zero(),
1879 "stable static w/ default value shouldn't be a constant");
1880 constant = make_constant(field_value, field);
1881 } else if (field->is_null_free() && field->type()->as_instance_klass()->is_initialized() &&
1882 field->type()->as_inline_klass()->is_empty()) {
1883 // Loading from a field of an empty inline type. Just return the default instance.
1884 constant = new Constant(new InstanceConstant(field->type()->as_inline_klass()->default_instance()));
1885 }
1886 if (constant != nullptr) {
1887 push(type, append(constant));
1888 } else {
1889 if (state_before == nullptr) {
1890 state_before = copy_state_for_exception();
1891 }
1892 LoadField* load_field = new LoadField(append(obj), offset, field, true,
1893 state_before, needs_patching);
1894 push(type, append(load_field));
1895 }
1896 break;
1897 }
1898 case Bytecodes::_putstatic: {
1899 Value val = pop(type);
1900 if (state_before == nullptr) {
1901 state_before = copy_state_for_exception();
1902 }
1903 if (field_type == T_BOOLEAN) {
1904 Value mask = append(new Constant(new IntConstant(1)));
1905 val = append(new LogicOp(Bytecodes::_iand, val, mask));
1906 }
1907 if (field->is_null_free()) {
1908 null_check(val);
1909 }
1910 if (field->is_null_free() && field->type()->is_loaded() && field->type()->as_inline_klass()->is_empty()) {
1911 // Storing to a field of an empty inline type. Ignore.
1912 break;
1913 }
1914 append(new StoreField(append(obj), offset, field, val, true, state_before, needs_patching));
1915 break;
1916 }
1917 case Bytecodes::_getfield: {
1918 // Check for compile-time constants, i.e., trusted final non-static fields.
1919 Value constant = nullptr;
1920 if (state_before == nullptr && field->is_flat()) {
1921 // Save the entire state and re-execute on deopt when accessing flat fields
1922 assert(Interpreter::bytecode_should_reexecute(code), "should reexecute");
1923 state_before = copy_state_before();
1924 }
1925 if (!has_pending_field_access() && !has_pending_load_indexed()) {
1926 obj = apop();
1927 ObjectType* obj_type = obj->type()->as_ObjectType();
1928 if (field->is_null_free() && field->type()->as_instance_klass()->is_initialized()
1929 && field->type()->as_inline_klass()->is_empty()) {
1930 // Loading from a field of an empty inline type. Just return the default instance.
1931 null_check(obj);
1932 constant = new Constant(new InstanceConstant(field->type()->as_inline_klass()->default_instance()));
1933 } else if (field->is_constant() && !field->is_flat() && obj_type->is_constant() && !PatchALot) {
1934 ciObject* const_oop = obj_type->constant_value();
1935 if (!const_oop->is_null_object() && const_oop->is_loaded()) {
1936 ciConstant field_value = field->constant_value_of(const_oop);
1937 if (field_value.is_valid()) {
1938 if (field->is_null_free() && field_value.is_null_or_zero()) {
1939 // Non-flat inline type field. Replace null by the default value.
1940 constant = new Constant(new InstanceConstant(field->type()->as_inline_klass()->default_instance()));
1941 } else {
1942 constant = make_constant(field_value, field);
1943 }
1944 // For CallSite objects add a dependency for invalidation of the optimization.
1945 if (field->is_call_site_target()) {
1946 ciCallSite* call_site = const_oop->as_call_site();
1947 if (!call_site->is_fully_initialized_constant_call_site()) {
1948 ciMethodHandle* target = field_value.as_object()->as_method_handle();
1949 dependency_recorder()->assert_call_site_target_value(call_site, target);
1950 }
1951 }
1952 }
1953 }
1954 }
1955 }
1956 if (constant != nullptr) {
1957 push(type, append(constant));
1958 } else {
1959 if (state_before == nullptr) {
1960 state_before = copy_state_for_exception();
1961 }
1962 if (!field->is_flat()) {
1963 if (has_pending_field_access()) {
1964 assert(!needs_patching, "Can't patch delayed field access");
1965 obj = pending_field_access()->obj();
1966 offset += pending_field_access()->offset() - field->holder()->as_inline_klass()->first_field_offset();
1967 field = pending_field_access()->holder()->get_field_by_offset(offset, false);
1968 assert(field != nullptr, "field not found");
1969 set_pending_field_access(nullptr);
1970 } else if (has_pending_load_indexed()) {
1971 assert(!needs_patching, "Can't patch delayed field access");
1972 pending_load_indexed()->update(field, offset - field->holder()->as_inline_klass()->first_field_offset());
1973 LoadIndexed* li = pending_load_indexed()->load_instr();
1974 li->set_type(type);
1975 push(type, append(li));
1976 set_pending_load_indexed(nullptr);
1977 break;
1978 }
1979 LoadField* load = new LoadField(obj, offset, field, false, state_before, needs_patching);
1980 Value replacement = !needs_patching ? _memory->load(load) : load;
1981 if (replacement != load) {
1982 assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked");
1983 // Writing an (integer) value to a boolean, byte, char or short field includes an implicit narrowing
1984 // conversion. Emit an explicit conversion here to get the correct field value after the write.
1985 switch (field_type) {
1986 case T_BOOLEAN:
1987 case T_BYTE:
1988 replacement = append(new Convert(Bytecodes::_i2b, replacement, type));
1989 break;
1990 case T_CHAR:
1991 replacement = append(new Convert(Bytecodes::_i2c, replacement, type));
1992 break;
1993 case T_SHORT:
1994 replacement = append(new Convert(Bytecodes::_i2s, replacement, type));
1995 break;
1996 default:
1997 break;
1998 }
1999 push(type, replacement);
2000 } else {
2001 push(type, append(load));
2002 }
2003 } else { // field is flat
2004 // Look at the next bytecode to check if we can delay the field access
2005 bool can_delay_access = false;
2006 ciBytecodeStream s(method());
2007 s.force_bci(bci());
2008 s.next();
2009 if (s.cur_bc() == Bytecodes::_getfield && !needs_patching) {
2010 ciField* next_field = s.get_field(will_link);
2011 bool next_needs_patching = !next_field->holder()->is_loaded() ||
2012 !next_field->will_link(method(), Bytecodes::_getfield) ||
2013 PatchALot;
2014 can_delay_access = C1UseDelayedFlattenedFieldReads && !next_needs_patching;
2015 }
2016 if (can_delay_access) {
2017 if (has_pending_load_indexed()) {
2018 pending_load_indexed()->update(field, offset - field->holder()->as_inline_klass()->first_field_offset());
2019 } else if (has_pending_field_access()) {
2020 pending_field_access()->inc_offset(offset - field->holder()->as_inline_klass()->first_field_offset());
2021 } else {
2022 null_check(obj);
2023 DelayedFieldAccess* dfa = new DelayedFieldAccess(obj, field->holder(), field->offset_in_bytes());
2024 set_pending_field_access(dfa);
2025 }
2026 } else {
2027 ciInlineKlass* inline_klass = field->type()->as_inline_klass();
2028 scope()->set_wrote_final();
2029 scope()->set_wrote_fields();
2030 bool need_membar = false;
2031 if (inline_klass->is_initialized() && inline_klass->is_empty()) {
2032 apush(append(new Constant(new InstanceConstant(inline_klass->default_instance()))));
2033 if (has_pending_field_access()) {
2034 set_pending_field_access(nullptr);
2035 } else if (has_pending_load_indexed()) {
2036 set_pending_load_indexed(nullptr);
2037 }
2038 } else if (has_pending_load_indexed()) {
2039 assert(!needs_patching, "Can't patch delayed field access");
2040 pending_load_indexed()->update(field, offset - field->holder()->as_inline_klass()->first_field_offset());
2041 NewInstance* vt = new NewInstance(inline_klass, pending_load_indexed()->state_before(), false, true);
2042 _memory->new_instance(vt);
2043 pending_load_indexed()->load_instr()->set_vt(vt);
2044 apush(append_split(vt));
2045 append(pending_load_indexed()->load_instr());
2046 set_pending_load_indexed(nullptr);
2047 need_membar = true;
2048 } else {
2049 NewInstance* new_instance = new NewInstance(inline_klass, state_before, false, true);
2050 _memory->new_instance(new_instance);
2051 apush(append_split(new_instance));
2052 assert(!needs_patching, "Can't patch flat inline type field access");
2053 if (has_pending_field_access()) {
2054 copy_inline_content(inline_klass, pending_field_access()->obj(),
2055 pending_field_access()->offset() + field->offset_in_bytes() - field->holder()->as_inline_klass()->first_field_offset(),
2056 new_instance, inline_klass->first_field_offset(), state_before);
2057 set_pending_field_access(nullptr);
2058 } else {
2059 copy_inline_content(inline_klass, obj, field->offset_in_bytes(), new_instance, inline_klass->first_field_offset(), state_before);
2060 }
2061 need_membar = true;
2062 }
2063 if (need_membar) {
2064 // If we allocated a new instance ensure the stores to copy the
2065 // field contents are visible before any subsequent store that
2066 // publishes this reference.
2067 append(new MemBar(lir_membar_storestore));
2068 }
2069 }
2070 }
2071 }
2072 break;
2073 }
2074 case Bytecodes::_putfield: {
2075 Value val = pop(type);
2076 obj = apop();
2077 if (state_before == nullptr) {
2078 state_before = copy_state_for_exception();
2079 }
2080 if (field_type == T_BOOLEAN) {
2081 Value mask = append(new Constant(new IntConstant(1)));
2082 val = append(new LogicOp(Bytecodes::_iand, val, mask));
2083 }
2084 if (field->is_null_free() && field->type()->is_loaded() && field->type()->as_inline_klass()->is_empty()) {
2085 // Storing to a field of an empty inline type. Ignore.
2086 null_check(obj);
2087 null_check(val);
2088 } else if (!field->is_flat()) {
2089 if (field->is_null_free()) {
2090 null_check(val);
2091 }
2092 StoreField* store = new StoreField(obj, offset, field, val, false, state_before, needs_patching);
2093 if (!needs_patching) store = _memory->store(store);
2094 if (store != nullptr) {
2095 append(store);
2096 }
2097 } else {
2098 assert(!needs_patching, "Can't patch flat inline type field access");
2099 ciInlineKlass* inline_klass = field->type()->as_inline_klass();
2100 copy_inline_content(inline_klass, val, inline_klass->first_field_offset(), obj, offset, state_before, field);
2101 }
2102 break;
2103 }
2104 default:
2105 ShouldNotReachHere();
2106 break;
2107 }
2108 }
2109
2110 Dependencies* GraphBuilder::dependency_recorder() const {
2111 assert(DeoptC1, "need debug information");
2112 return compilation()->dependency_recorder();
2113 }
2114
2115 // How many arguments do we want to profile?
2116 Values* GraphBuilder::args_list_for_profiling(ciMethod* target, int& start, bool may_have_receiver) {
2117 int n = 0;
2118 bool has_receiver = may_have_receiver && Bytecodes::has_receiver(method()->java_code_at_bci(bci()));
2119 start = has_receiver ? 1 : 0;
2120 if (profile_arguments()) {
2121 ciProfileData* data = method()->method_data()->bci_to_data(bci());
2122 if (data != nullptr && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) {
2123 n = data->is_CallTypeData() ? data->as_CallTypeData()->number_of_arguments() : data->as_VirtualCallTypeData()->number_of_arguments();
2124 }
2125 }
2126 // If we are inlining then we need to collect arguments to profile parameters for the target
2127 if (profile_parameters() && target != nullptr) {
2128 if (target->method_data() != nullptr && target->method_data()->parameters_type_data() != nullptr) {
2129 // The receiver is profiled on method entry so it's included in
2130 // the number of parameters but here we're only interested in
2131 // actual arguments.
2132 n = MAX2(n, target->method_data()->parameters_type_data()->number_of_parameters() - start);
2133 }
2134 }
2135 if (n > 0) {
2136 return new Values(n);
2137 }
2138 return nullptr;
2139 }
2140
2141 void GraphBuilder::check_args_for_profiling(Values* obj_args, int expected) {
2142 #ifdef ASSERT
2143 bool ignored_will_link;
2144 ciSignature* declared_signature = nullptr;
2145 ciMethod* real_target = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature);
2146 assert(expected == obj_args->capacity() || real_target->is_method_handle_intrinsic(), "missed on arg?");
2147 #endif
2148 }
2149
2150 // Collect arguments that we want to profile in a list
2151 Values* GraphBuilder::collect_args_for_profiling(Values* args, ciMethod* target, bool may_have_receiver) {
2152 int start = 0;
2153 Values* obj_args = args_list_for_profiling(target, start, may_have_receiver);
2154 if (obj_args == nullptr) {
2155 return nullptr;
2156 }
2157 int s = obj_args->capacity();
2158 // if called through method handle invoke, some arguments may have been popped
2159 for (int i = start, j = 0; j < s && i < args->length(); i++) {
2160 if (args->at(i)->type()->is_object_kind()) {
2161 obj_args->push(args->at(i));
2162 j++;
2163 }
2164 }
2165 check_args_for_profiling(obj_args, s);
2166 return obj_args;
2167 }
2168
2169 void GraphBuilder::invoke(Bytecodes::Code code) {
2170 bool will_link;
2171 ciSignature* declared_signature = nullptr;
2172 ciMethod* target = stream()->get_method(will_link, &declared_signature);
2173 ciKlass* holder = stream()->get_declared_method_holder();
2174 const Bytecodes::Code bc_raw = stream()->cur_bc_raw();
2175 assert(declared_signature != nullptr, "cannot be null");
2176 assert(will_link == target->is_loaded(), "");
2177 JFR_ONLY(Jfr::on_resolution(this, holder, target); CHECK_BAILOUT();)
2178
2179 ciInstanceKlass* klass = target->holder();
2180 assert(!target->is_loaded() || klass->is_loaded(), "loaded target must imply loaded klass");
2181
2182 // check if CHA possible: if so, change the code to invoke_special
2183 ciInstanceKlass* calling_klass = method()->holder();
2184 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder);
2185 ciInstanceKlass* actual_recv = callee_holder;
2186
2187 CompileLog* log = compilation()->log();
2188 if (log != nullptr)
2189 log->elem("call method='%d' instr='%s'",
2190 log->identify(target),
2191 Bytecodes::name(code));
2192
2193 // Some methods are obviously bindable without any type checks so
2194 // convert them directly to an invokespecial or invokestatic.
2195 if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) {
2196 switch (bc_raw) {
2197 case Bytecodes::_invokeinterface:
2198 // convert to invokespecial if the target is the private interface method.
2199 if (target->is_private()) {
2200 assert(holder->is_interface(), "How did we get a non-interface method here!");
2201 code = Bytecodes::_invokespecial;
2202 }
2203 break;
2204 case Bytecodes::_invokevirtual:
2205 code = Bytecodes::_invokespecial;
2206 break;
2207 case Bytecodes::_invokehandle:
2208 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial;
2209 break;
2210 default:
2211 break;
2212 }
2213 } else {
2214 if (bc_raw == Bytecodes::_invokehandle) {
2215 assert(!will_link, "should come here only for unlinked call");
2216 code = Bytecodes::_invokespecial;
2217 }
2218 }
2219
2220 if (code == Bytecodes::_invokespecial) {
2221 // Additional receiver subtype checks for interface calls via invokespecial or invokeinterface.
2222 ciKlass* receiver_constraint = nullptr;
2223
2224 if (bc_raw == Bytecodes::_invokeinterface) {
2225 receiver_constraint = holder;
2226 } else if (bc_raw == Bytecodes::_invokespecial && !target->is_object_constructor() && calling_klass->is_interface()) {
2227 receiver_constraint = calling_klass;
2228 }
2229
2230 if (receiver_constraint != nullptr) {
2231 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
2232 Value receiver = state()->stack_at(index);
2233 CheckCast* c = new CheckCast(receiver_constraint, receiver, copy_state_before());
2234 // go to uncommon_trap when checkcast fails
2235 c->set_invokespecial_receiver_check();
2236 state()->stack_at_put(index, append_split(c));
2237 }
2238 }
2239
2240 // Push appendix argument (MethodType, CallSite, etc.), if one.
2241 bool patch_for_appendix = false;
2242 int patching_appendix_arg = 0;
2243 if (Bytecodes::has_optional_appendix(bc_raw) && (!will_link || PatchALot)) {
2244 Value arg = append(new Constant(new ObjectConstant(compilation()->env()->unloaded_ciinstance()), copy_state_before()));
2245 apush(arg);
2246 patch_for_appendix = true;
2247 patching_appendix_arg = (will_link && stream()->has_appendix()) ? 0 : 1;
2248 } else if (stream()->has_appendix()) {
2249 ciObject* appendix = stream()->get_appendix();
2250 Value arg = append(new Constant(new ObjectConstant(appendix)));
2251 apush(arg);
2252 }
2253
2254 ciMethod* cha_monomorphic_target = nullptr;
2255 ciMethod* exact_target = nullptr;
2256 Value better_receiver = nullptr;
2257 if (UseCHA && DeoptC1 && target->is_loaded() &&
2258 !(// %%% FIXME: Are both of these relevant?
2259 target->is_method_handle_intrinsic() ||
2260 target->is_compiled_lambda_form()) &&
2261 !patch_for_appendix) {
2262 Value receiver = nullptr;
2263 ciInstanceKlass* receiver_klass = nullptr;
2264 bool type_is_exact = false;
2265 // try to find a precise receiver type
2266 if (will_link && !target->is_static()) {
2267 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
2268 receiver = state()->stack_at(index);
2269 ciType* type = receiver->exact_type();
2270 if (type != nullptr && type->is_loaded() &&
2271 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
2272 receiver_klass = (ciInstanceKlass*) type;
2273 type_is_exact = true;
2274 }
2275 if (type == nullptr) {
2276 type = receiver->declared_type();
2277 if (type != nullptr && type->is_loaded() &&
2278 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
2279 receiver_klass = (ciInstanceKlass*) type;
2280 if (receiver_klass->is_leaf_type() && !receiver_klass->is_final()) {
2281 // Insert a dependency on this type since
2282 // find_monomorphic_target may assume it's already done.
2283 dependency_recorder()->assert_leaf_type(receiver_klass);
2284 type_is_exact = true;
2285 }
2286 }
2287 }
2288 }
2289 if (receiver_klass != nullptr && type_is_exact &&
2290 receiver_klass->is_loaded() && code != Bytecodes::_invokespecial) {
2291 // If we have the exact receiver type we can bind directly to
2292 // the method to call.
2293 exact_target = target->resolve_invoke(calling_klass, receiver_klass);
2294 if (exact_target != nullptr) {
2295 target = exact_target;
2296 code = Bytecodes::_invokespecial;
2297 }
2298 }
2299 if (receiver_klass != nullptr &&
2300 receiver_klass->is_subtype_of(actual_recv) &&
2301 actual_recv->is_initialized()) {
2302 actual_recv = receiver_klass;
2303 }
2304
2305 if ((code == Bytecodes::_invokevirtual && callee_holder->is_initialized()) ||
2306 (code == Bytecodes::_invokeinterface && callee_holder->is_initialized() && !actual_recv->is_interface())) {
2307 // Use CHA on the receiver to select a more precise method.
2308 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv);
2309 } else if (code == Bytecodes::_invokeinterface && callee_holder->is_loaded() && receiver != nullptr) {
2310 assert(callee_holder->is_interface(), "invokeinterface to non interface?");
2311 // If there is only one implementor of this interface then we
2312 // may be able bind this invoke directly to the implementing
2313 // klass but we need both a dependence on the single interface
2314 // and on the method we bind to. Additionally since all we know
2315 // about the receiver type is the it's supposed to implement the
2316 // interface we have to insert a check that it's the class we
2317 // expect. Interface types are not checked by the verifier so
2318 // they are roughly equivalent to Object.
2319 // The number of implementors for declared_interface is less or
2320 // equal to the number of implementors for target->holder() so
2321 // if number of implementors of target->holder() == 1 then
2322 // number of implementors for decl_interface is 0 or 1. If
2323 // it's 0 then no class implements decl_interface and there's
2324 // no point in inlining.
2325 ciInstanceKlass* declared_interface = callee_holder;
2326 ciInstanceKlass* singleton = declared_interface->unique_implementor();
2327 if (singleton != nullptr) {
2328 assert(singleton != declared_interface, "not a unique implementor");
2329 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, declared_interface, singleton);
2330 if (cha_monomorphic_target != nullptr) {
2331 ciInstanceKlass* holder = cha_monomorphic_target->holder();
2332 ciInstanceKlass* constraint = (holder->is_subtype_of(singleton) ? holder : singleton); // avoid upcasts
2333 if (holder != compilation()->env()->Object_klass() &&
2334 (!type_is_exact || receiver_klass->is_subtype_of(constraint))) {
2335 actual_recv = declared_interface;
2336
2337 // insert a check it's really the expected class.
2338 CheckCast* c = new CheckCast(constraint, receiver, copy_state_for_exception());
2339 c->set_incompatible_class_change_check();
2340 c->set_direct_compare(constraint->is_final());
2341 // pass the result of the checkcast so that the compiler has
2342 // more accurate type info in the inlinee
2343 better_receiver = append_split(c);
2344
2345 dependency_recorder()->assert_unique_implementor(declared_interface, singleton);
2346 } else {
2347 cha_monomorphic_target = nullptr;
2348 }
2349 }
2350 }
2351 }
2352 }
2353
2354 if (cha_monomorphic_target != nullptr) {
2355 assert(!target->can_be_statically_bound() || target == cha_monomorphic_target, "");
2356 assert(!cha_monomorphic_target->is_abstract(), "");
2357 if (!cha_monomorphic_target->can_be_statically_bound(actual_recv)) {
2358 // If we inlined because CHA revealed only a single target method,
2359 // then we are dependent on that target method not getting overridden
2360 // by dynamic class loading. Be sure to test the "static" receiver
2361 // dest_method here, as opposed to the actual receiver, which may
2362 // falsely lead us to believe that the receiver is final or private.
2363 dependency_recorder()->assert_unique_concrete_method(actual_recv, cha_monomorphic_target, callee_holder, target);
2364 }
2365 code = Bytecodes::_invokespecial;
2366 }
2367
2368 // check if we could do inlining
2369 if (!PatchALot && Inline && target->is_loaded() && !patch_for_appendix &&
2370 callee_holder->is_loaded()) { // the effect of symbolic reference resolution
2371
2372 // callee is known => check if we have static binding
2373 if ((code == Bytecodes::_invokestatic && klass->is_initialized()) || // invokestatic involves an initialization barrier on declaring class
2374 code == Bytecodes::_invokespecial ||
2375 (code == Bytecodes::_invokevirtual && target->is_final_method()) ||
2376 code == Bytecodes::_invokedynamic) {
2377 // static binding => check if callee is ok
2378 ciMethod* inline_target = (cha_monomorphic_target != nullptr) ? cha_monomorphic_target : target;
2379 bool holder_known = (cha_monomorphic_target != nullptr) || (exact_target != nullptr);
2380 bool success = try_inline(inline_target, holder_known, false /* ignore_return */, code, better_receiver);
2381
2382 CHECK_BAILOUT();
2383 clear_inline_bailout();
2384
2385 if (success) {
2386 // Register dependence if JVMTI has either breakpoint
2387 // setting or hotswapping of methods capabilities since they may
2388 // cause deoptimization.
2389 if (compilation()->env()->jvmti_can_hotswap_or_post_breakpoint()) {
2390 dependency_recorder()->assert_evol_method(inline_target);
2391 }
2392 return;
2393 }
2394 } else {
2395 print_inlining(target, "no static binding", /*success*/ false);
2396 }
2397 } else {
2398 print_inlining(target, "not inlineable", /*success*/ false);
2399 }
2400
2401 // If we attempted an inline which did not succeed because of a
2402 // bailout during construction of the callee graph, the entire
2403 // compilation has to be aborted. This is fairly rare and currently
2404 // seems to only occur for jasm-generated classes which contain
2405 // jsr/ret pairs which are not associated with finally clauses and
2406 // do not have exception handlers in the containing method, and are
2407 // therefore not caught early enough to abort the inlining without
2408 // corrupting the graph. (We currently bail out with a non-empty
2409 // stack at a ret in these situations.)
2410 CHECK_BAILOUT();
2411
2412 // inlining not successful => standard invoke
2413 ValueType* result_type = as_ValueType(declared_signature->return_type());
2414 ValueStack* state_before = copy_state_exhandling();
2415
2416 // The bytecode (code) might change in this method so we are checking this very late.
2417 const bool has_receiver =
2418 code == Bytecodes::_invokespecial ||
2419 code == Bytecodes::_invokevirtual ||
2420 code == Bytecodes::_invokeinterface;
2421 Values* args = state()->pop_arguments(target->arg_size_no_receiver() + patching_appendix_arg);
2422 Value recv = has_receiver ? apop() : nullptr;
2423
2424 // A null check is required here (when there is a receiver) for any of the following cases
2425 // - invokespecial, always need a null check.
2426 // - invokevirtual, when the target is final and loaded. Calls to final targets will become optimized
2427 // and require null checking. If the target is loaded a null check is emitted here.
2428 // If the target isn't loaded the null check must happen after the call resolution. We achieve that
2429 // by using the target methods unverified entry point (see CompiledIC::compute_monomorphic_entry).
2430 // (The JVM specification requires that LinkageError must be thrown before a NPE. An unloaded target may
2431 // potentially fail, and can't have the null check before the resolution.)
2432 // - A call that will be profiled. (But we can't add a null check when the target is unloaded, by the same
2433 // reason as above, so calls with a receiver to unloaded targets can't be profiled.)
2434 //
2435 // Normal invokevirtual will perform the null check during lookup
2436
2437 bool need_null_check = (code == Bytecodes::_invokespecial) ||
2438 (target->is_loaded() && (target->is_final_method() || (is_profiling() && profile_calls())));
2439
2440 if (need_null_check) {
2441 if (recv != nullptr) {
2442 null_check(recv);
2443 }
2444
2445 if (is_profiling()) {
2446 // Note that we'd collect profile data in this method if we wanted it.
2447 compilation()->set_would_profile(true);
2448
2449 if (profile_calls()) {
2450 assert(cha_monomorphic_target == nullptr || exact_target == nullptr, "both can not be set");
2451 ciKlass* target_klass = nullptr;
2452 if (cha_monomorphic_target != nullptr) {
2453 target_klass = cha_monomorphic_target->holder();
2454 } else if (exact_target != nullptr) {
2455 target_klass = exact_target->holder();
2456 }
2457 profile_call(target, recv, target_klass, collect_args_for_profiling(args, nullptr, false), false);
2458 }
2459 }
2460 }
2461
2462 Invoke* result = new Invoke(code, result_type, recv, args, target, state_before);
2463 // push result
2464 append_split(result);
2465
2466 if (result_type != voidType) {
2467 push(result_type, round_fp(result));
2468 }
2469 if (profile_return() && result_type->is_object_kind()) {
2470 profile_return_type(result, target);
2471 }
2472 }
2473
2474
2475 void GraphBuilder::new_instance(int klass_index) {
2476 ValueStack* state_before = copy_state_exhandling();
2477 ciKlass* klass = stream()->get_klass();
2478 assert(klass->is_instance_klass(), "must be an instance klass");
2479 if (!stream()->is_unresolved_klass() && klass->is_inlinetype() &&
2480 klass->as_inline_klass()->is_initialized() && klass->as_inline_klass()->is_empty()) {
2481 ciInlineKlass* vk = klass->as_inline_klass();
2482 apush(append(new Constant(new InstanceConstant(vk->default_instance()))));
2483 } else {
2484 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before, stream()->is_unresolved_klass(), false);
2485 _memory->new_instance(new_instance);
2486 apush(append_split(new_instance));
2487 }
2488 }
2489
2490 void GraphBuilder::new_type_array() {
2491 ValueStack* state_before = copy_state_exhandling();
2492 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before)));
2493 }
2494
2495
2496 void GraphBuilder::new_object_array() {
2497 ciKlass* klass = stream()->get_klass();
2498 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2499 NewArray* n = new NewObjectArray(klass, ipop(), state_before);
2500 apush(append_split(n));
2501 }
2502
2503
2504 bool GraphBuilder::direct_compare(ciKlass* k) {
2505 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) {
2506 ciInstanceKlass* ik = k->as_instance_klass();
2507 if (ik->is_final()) {
2508 return true;
2509 } else {
2510 if (DeoptC1 && UseCHA && !(ik->has_subklass() || ik->is_interface())) {
2511 // test class is leaf class
2512 dependency_recorder()->assert_leaf_type(ik);
2513 return true;
2514 }
2515 }
2516 }
2517 return false;
2518 }
2519
2520
2521 void GraphBuilder::check_cast(int klass_index) {
2522 ciKlass* klass = stream()->get_klass();
2523 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_for_exception();
2524 CheckCast* c = new CheckCast(klass, apop(), state_before);
2525 apush(append_split(c));
2526 c->set_direct_compare(direct_compare(klass));
2527
2528 if (is_profiling()) {
2529 // Note that we'd collect profile data in this method if we wanted it.
2530 compilation()->set_would_profile(true);
2531
2532 if (profile_checkcasts()) {
2533 c->set_profiled_method(method());
2534 c->set_profiled_bci(bci());
2535 c->set_should_profile(true);
2536 }
2537 }
2538 }
2539
2540
2541 void GraphBuilder::instance_of(int klass_index) {
2542 ciKlass* klass = stream()->get_klass();
2543 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2544 InstanceOf* i = new InstanceOf(klass, apop(), state_before);
2545 ipush(append_split(i));
2546 i->set_direct_compare(direct_compare(klass));
2547
2548 if (is_profiling()) {
2549 // Note that we'd collect profile data in this method if we wanted it.
2550 compilation()->set_would_profile(true);
2551
2552 if (profile_checkcasts()) {
2553 i->set_profiled_method(method());
2554 i->set_profiled_bci(bci());
2555 i->set_should_profile(true);
2556 }
2557 }
2558 }
2559
2560
2561 void GraphBuilder::monitorenter(Value x, int bci) {
2562 bool maybe_inlinetype = false;
2563 if (bci == InvocationEntryBci) {
2564 // Called by GraphBuilder::inline_sync_entry.
2565 #ifdef ASSERT
2566 ciType* obj_type = x->declared_type();
2567 assert(obj_type == nullptr || !obj_type->is_inlinetype(), "inline types cannot have synchronized methods");
2568 #endif
2569 } else {
2570 // We are compiling a monitorenter bytecode
2571 if (EnableValhalla) {
2572 ciType* obj_type = x->declared_type();
2573 if (obj_type == nullptr || obj_type->as_klass()->can_be_inline_klass()) {
2574 // If we're (possibly) locking on an inline type, check for markWord::always_locked_pattern
2575 // and throw IMSE. (obj_type is null for Phi nodes, so let's just be conservative).
2576 maybe_inlinetype = true;
2577 }
2578 }
2579 }
2580
2581 // save state before locking in case of deoptimization after a NullPointerException
2582 ValueStack* state_before = copy_state_for_exception_with_bci(bci);
2583 compilation()->set_has_monitors(true);
2584 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before, maybe_inlinetype), bci);
2585 kill_all();
2586 }
2587
2588
2589 void GraphBuilder::monitorexit(Value x, int bci) {
2590 append_with_bci(new MonitorExit(x, state()->unlock()), bci);
2591 kill_all();
2592 }
2593
2594
2595 void GraphBuilder::new_multi_array(int dimensions) {
2596 ciKlass* klass = stream()->get_klass();
2597 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2598
2599 Values* dims = new Values(dimensions, dimensions, nullptr);
2600 // fill in all dimensions
2601 int i = dimensions;
2602 while (i-- > 0) dims->at_put(i, ipop());
2603 // create array
2604 NewArray* n = new NewMultiArray(klass, dims, state_before);
2605 apush(append_split(n));
2606 }
2607
2608
2609 void GraphBuilder::throw_op(int bci) {
2610 // We require that the debug info for a Throw be the "state before"
2611 // the Throw (i.e., exception oop is still on TOS)
2612 ValueStack* state_before = copy_state_before_with_bci(bci);
2613 Throw* t = new Throw(apop(), state_before);
2614 // operand stack not needed after a throw
2615 state()->truncate_stack(0);
2616 append_with_bci(t, bci);
2617 }
2618
2619
2620 Value GraphBuilder::round_fp(Value fp_value) {
2621 if (strict_fp_requires_explicit_rounding) {
2622 #ifdef IA32
2623 // no rounding needed if SSE2 is used
2624 if (UseSSE < 2) {
2625 // Must currently insert rounding node for doubleword values that
2626 // are results of expressions (i.e., not loads from memory or
2627 // constants)
2628 if (fp_value->type()->tag() == doubleTag &&
2629 fp_value->as_Constant() == nullptr &&
2630 fp_value->as_Local() == nullptr && // method parameters need no rounding
2631 fp_value->as_RoundFP() == nullptr) {
2632 return append(new RoundFP(fp_value));
2633 }
2634 }
2635 #else
2636 Unimplemented();
2637 #endif // IA32
2638 }
2639 return fp_value;
2640 }
2641
2642
2643 Instruction* GraphBuilder::append_with_bci(Instruction* instr, int bci) {
2644 Canonicalizer canon(compilation(), instr, bci);
2645 Instruction* i1 = canon.canonical();
2646 if (i1->is_linked() || !i1->can_be_linked()) {
2647 // Canonicalizer returned an instruction which was already
2648 // appended so simply return it.
2649 return i1;
2650 }
2651
2652 if (UseLocalValueNumbering) {
2653 // Lookup the instruction in the ValueMap and add it to the map if
2654 // it's not found.
2655 Instruction* i2 = vmap()->find_insert(i1);
2656 if (i2 != i1) {
2657 // found an entry in the value map, so just return it.
2658 assert(i2->is_linked(), "should already be linked");
2659 return i2;
2660 }
2661 ValueNumberingEffects vne(vmap());
2662 i1->visit(&vne);
2663 }
2664
2665 // i1 was not eliminated => append it
2666 assert(i1->next() == nullptr, "shouldn't already be linked");
2667 _last = _last->set_next(i1, canon.bci());
2668
2669 if (++_instruction_count >= InstructionCountCutoff && !bailed_out()) {
2670 // set the bailout state but complete normal processing. We
2671 // might do a little more work before noticing the bailout so we
2672 // want processing to continue normally until it's noticed.
2673 bailout("Method and/or inlining is too large");
2674 }
2675
2676 #ifndef PRODUCT
2677 if (PrintIRDuringConstruction) {
2678 InstructionPrinter ip;
2679 ip.print_line(i1);
2680 if (Verbose) {
2681 state()->print();
2682 }
2683 }
2684 #endif
2685
2686 // save state after modification of operand stack for StateSplit instructions
2687 StateSplit* s = i1->as_StateSplit();
2688 if (s != nullptr) {
2689 if (EliminateFieldAccess) {
2690 Intrinsic* intrinsic = s->as_Intrinsic();
2691 if (s->as_Invoke() != nullptr || (intrinsic && !intrinsic->preserves_state())) {
2692 _memory->kill();
2693 }
2694 }
2695 s->set_state(state()->copy(ValueStack::StateAfter, canon.bci()));
2696 }
2697
2698 // set up exception handlers for this instruction if necessary
2699 if (i1->can_trap()) {
2700 i1->set_exception_handlers(handle_exception(i1));
2701 assert(i1->exception_state() != nullptr || !i1->needs_exception_state() || bailed_out(), "handle_exception must set exception state");
2702 }
2703 return i1;
2704 }
2705
2706
2707 Instruction* GraphBuilder::append(Instruction* instr) {
2708 assert(instr->as_StateSplit() == nullptr || instr->as_BlockEnd() != nullptr, "wrong append used");
2709 return append_with_bci(instr, bci());
2710 }
2711
2712
2713 Instruction* GraphBuilder::append_split(StateSplit* instr) {
2714 return append_with_bci(instr, bci());
2715 }
2716
2717
2718 void GraphBuilder::null_check(Value value) {
2719 if (value->as_NewArray() != nullptr || value->as_NewInstance() != nullptr) {
2720 return;
2721 } else {
2722 Constant* con = value->as_Constant();
2723 if (con) {
2724 ObjectType* c = con->type()->as_ObjectType();
2725 if (c && c->is_loaded()) {
2726 ObjectConstant* oc = c->as_ObjectConstant();
2727 if (!oc || !oc->value()->is_null_object()) {
2728 return;
2729 }
2730 }
2731 }
2732 if (value->is_null_free()) return;
2733 }
2734 append(new NullCheck(value, copy_state_for_exception()));
2735 }
2736
2737
2738
2739 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) {
2740 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != nullptr)) {
2741 assert(instruction->exception_state() == nullptr
2742 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState
2743 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->should_retain_local_variables()),
2744 "exception_state should be of exception kind");
2745 return new XHandlers();
2746 }
2747
2748 XHandlers* exception_handlers = new XHandlers();
2749 ScopeData* cur_scope_data = scope_data();
2750 ValueStack* cur_state = instruction->state_before();
2751 ValueStack* prev_state = nullptr;
2752 int scope_count = 0;
2753
2754 assert(cur_state != nullptr, "state_before must be set");
2755 do {
2756 int cur_bci = cur_state->bci();
2757 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2758 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci()
2759 || has_pending_field_access() || has_pending_load_indexed(), "invalid bci");
2760
2761
2762 // join with all potential exception handlers
2763 XHandlers* list = cur_scope_data->xhandlers();
2764 const int n = list->length();
2765 for (int i = 0; i < n; i++) {
2766 XHandler* h = list->handler_at(i);
2767 if (h->covers(cur_bci)) {
2768 // h is a potential exception handler => join it
2769 compilation()->set_has_exception_handlers(true);
2770
2771 BlockBegin* entry = h->entry_block();
2772 if (entry == block()) {
2773 // It's acceptable for an exception handler to cover itself
2774 // but we don't handle that in the parser currently. It's
2775 // very rare so we bailout instead of trying to handle it.
2776 BAILOUT_("exception handler covers itself", exception_handlers);
2777 }
2778 assert(entry->bci() == h->handler_bci(), "must match");
2779 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond");
2780
2781 // previously this was a BAILOUT, but this is not necessary
2782 // now because asynchronous exceptions are not handled this way.
2783 assert(entry->state() == nullptr || cur_state->total_locks_size() == entry->state()->total_locks_size(), "locks do not match");
2784
2785 // xhandler start with an empty expression stack
2786 if (cur_state->stack_size() != 0) {
2787 // locals are preserved
2788 // stack will be truncated
2789 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
2790 }
2791 if (instruction->exception_state() == nullptr) {
2792 instruction->set_exception_state(cur_state);
2793 }
2794
2795 // Note: Usually this join must work. However, very
2796 // complicated jsr-ret structures where we don't ret from
2797 // the subroutine can cause the objects on the monitor
2798 // stacks to not match because blocks can be parsed twice.
2799 // The only test case we've seen so far which exhibits this
2800 // problem is caught by the infinite recursion test in
2801 // GraphBuilder::jsr() if the join doesn't work.
2802 if (!entry->try_merge(cur_state, compilation()->has_irreducible_loops())) {
2803 BAILOUT_("error while joining with exception handler, prob. due to complicated jsr/rets", exception_handlers);
2804 }
2805
2806 // add current state for correct handling of phi functions at begin of xhandler
2807 int phi_operand = entry->add_exception_state(cur_state);
2808
2809 // add entry to the list of xhandlers of this block
2810 _block->add_exception_handler(entry);
2811
2812 // add back-edge from xhandler entry to this block
2813 if (!entry->is_predecessor(_block)) {
2814 entry->add_predecessor(_block);
2815 }
2816
2817 // clone XHandler because phi_operand and scope_count can not be shared
2818 XHandler* new_xhandler = new XHandler(h);
2819 new_xhandler->set_phi_operand(phi_operand);
2820 new_xhandler->set_scope_count(scope_count);
2821 exception_handlers->append(new_xhandler);
2822
2823 // fill in exception handler subgraph lazily
2824 assert(!entry->is_set(BlockBegin::was_visited_flag), "entry must not be visited yet");
2825 cur_scope_data->add_to_work_list(entry);
2826
2827 // stop when reaching catchall
2828 if (h->catch_type() == 0) {
2829 return exception_handlers;
2830 }
2831 }
2832 }
2833
2834 if (exception_handlers->length() == 0) {
2835 // This scope and all callees do not handle exceptions, so the local
2836 // variables of this scope are not needed. However, the scope itself is
2837 // required for a correct exception stack trace -> clear out the locals.
2838 // Stack and locals are invalidated but not truncated in caller state.
2839 if (prev_state != nullptr) {
2840 assert(instruction->exception_state() != nullptr, "missed set?");
2841 ValueStack::Kind exc_kind = ValueStack::empty_exception_kind(true /* caller */);
2842 cur_state = cur_state->copy(exc_kind, cur_state->bci());
2843 // reset caller exception state
2844 prev_state->set_caller_state(cur_state);
2845 } else {
2846 assert(instruction->exception_state() == nullptr, "already set");
2847 // set instruction exception state
2848 // truncate stack
2849 ValueStack::Kind exc_kind = ValueStack::empty_exception_kind();
2850 cur_state = cur_state->copy(exc_kind, cur_state->bci());
2851 instruction->set_exception_state(cur_state);
2852 }
2853 }
2854
2855 // Set up iteration for next time.
2856 // If parsing a jsr, do not grab exception handlers from the
2857 // parent scopes for this method (already got them, and they
2858 // needed to be cloned)
2859
2860 while (cur_scope_data->parsing_jsr()) {
2861 cur_scope_data = cur_scope_data->parent();
2862 }
2863
2864 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2865 assert(cur_state->locks_size() == 0 || cur_state->locks_size() == 1, "unlocking must be done in a catchall exception handler");
2866
2867 prev_state = cur_state;
2868 cur_state = cur_state->caller_state();
2869 cur_scope_data = cur_scope_data->parent();
2870 scope_count++;
2871 } while (cur_scope_data != nullptr);
2872
2873 return exception_handlers;
2874 }
2875
2876
2877 // Helper class for simplifying Phis.
2878 class PhiSimplifier : public BlockClosure {
2879 private:
2880 bool _has_substitutions;
2881 Value simplify(Value v);
2882
2883 public:
2884 PhiSimplifier(BlockBegin* start) : _has_substitutions(false) {
2885 start->iterate_preorder(this);
2886 if (_has_substitutions) {
2887 SubstitutionResolver sr(start);
2888 }
2889 }
2890 void block_do(BlockBegin* b);
2891 bool has_substitutions() const { return _has_substitutions; }
2892 };
2893
2894
2895 Value PhiSimplifier::simplify(Value v) {
2896 Phi* phi = v->as_Phi();
2897
2898 if (phi == nullptr) {
2899 // no phi function
2900 return v;
2901 } else if (v->has_subst()) {
2902 // already substituted; subst can be phi itself -> simplify
2903 return simplify(v->subst());
2904 } else if (phi->is_set(Phi::cannot_simplify)) {
2905 // already tried to simplify phi before
2906 return phi;
2907 } else if (phi->is_set(Phi::visited)) {
2908 // break cycles in phi functions
2909 return phi;
2910 } else if (phi->type()->is_illegal()) {
2911 // illegal phi functions are ignored anyway
2912 return phi;
2913
2914 } else {
2915 // mark phi function as processed to break cycles in phi functions
2916 phi->set(Phi::visited);
2917
2918 // simplify x = [y, x] and x = [y, y] to y
2919 Value subst = nullptr;
2920 int opd_count = phi->operand_count();
2921 for (int i = 0; i < opd_count; i++) {
2922 Value opd = phi->operand_at(i);
2923 assert(opd != nullptr, "Operand must exist!");
2924
2925 if (opd->type()->is_illegal()) {
2926 // if one operand is illegal, the entire phi function is illegal
2927 phi->make_illegal();
2928 phi->clear(Phi::visited);
2929 return phi;
2930 }
2931
2932 Value new_opd = simplify(opd);
2933 assert(new_opd != nullptr, "Simplified operand must exist!");
2934
2935 if (new_opd != phi && new_opd != subst) {
2936 if (subst == nullptr) {
2937 subst = new_opd;
2938 } else {
2939 // no simplification possible
2940 phi->set(Phi::cannot_simplify);
2941 phi->clear(Phi::visited);
2942 return phi;
2943 }
2944 }
2945 }
2946
2947 // successfully simplified phi function
2948 assert(subst != nullptr, "illegal phi function");
2949 _has_substitutions = true;
2950 phi->clear(Phi::visited);
2951 phi->set_subst(subst);
2952
2953 #ifndef PRODUCT
2954 if (PrintPhiFunctions) {
2955 tty->print_cr("simplified phi function %c%d to %c%d (Block B%d)", phi->type()->tchar(), phi->id(), subst->type()->tchar(), subst->id(), phi->block()->block_id());
2956 }
2957 #endif
2958
2959 return subst;
2960 }
2961 }
2962
2963
2964 void PhiSimplifier::block_do(BlockBegin* b) {
2965 for_each_phi_fun(b, phi,
2966 simplify(phi);
2967 );
2968
2969 #ifdef ASSERT
2970 for_each_phi_fun(b, phi,
2971 assert(phi->operand_count() != 1 || phi->subst() != phi || phi->is_illegal(), "missed trivial simplification");
2972 );
2973
2974 ValueStack* state = b->state()->caller_state();
2975 for_each_state_value(state, value,
2976 Phi* phi = value->as_Phi();
2977 assert(phi == nullptr || phi->block() != b, "must not have phi function to simplify in caller state");
2978 );
2979 #endif
2980 }
2981
2982 // This method is called after all blocks are filled with HIR instructions
2983 // It eliminates all Phi functions of the form x = [y, y] and x = [y, x]
2984 void GraphBuilder::eliminate_redundant_phis(BlockBegin* start) {
2985 PhiSimplifier simplifier(start);
2986 }
2987
2988
2989 void GraphBuilder::connect_to_end(BlockBegin* beg) {
2990 // setup iteration
2991 kill_all();
2992 _block = beg;
2993 _state = beg->state()->copy_for_parsing();
2994 _last = beg;
2995 iterate_bytecodes_for_block(beg->bci());
2996 }
2997
2998
2999 BlockEnd* GraphBuilder::iterate_bytecodes_for_block(int bci) {
3000 #ifndef PRODUCT
3001 if (PrintIRDuringConstruction) {
3002 tty->cr();
3003 InstructionPrinter ip;
3004 ip.print_instr(_block); tty->cr();
3005 ip.print_stack(_block->state()); tty->cr();
3006 ip.print_inline_level(_block);
3007 ip.print_head();
3008 tty->print_cr("locals size: %d stack size: %d", state()->locals_size(), state()->stack_size());
3009 }
3010 #endif
3011 _skip_block = false;
3012 assert(state() != nullptr, "ValueStack missing!");
3013 CompileLog* log = compilation()->log();
3014 ciBytecodeStream s(method());
3015 s.reset_to_bci(bci);
3016 int prev_bci = bci;
3017 scope_data()->set_stream(&s);
3018 // iterate
3019 Bytecodes::Code code = Bytecodes::_illegal;
3020 bool push_exception = false;
3021
3022 if (block()->is_set(BlockBegin::exception_entry_flag) && block()->next() == nullptr) {
3023 // first thing in the exception entry block should be the exception object.
3024 push_exception = true;
3025 }
3026
3027 bool ignore_return = scope_data()->ignore_return();
3028
3029 while (!bailed_out() && last()->as_BlockEnd() == nullptr &&
3030 (code = stream()->next()) != ciBytecodeStream::EOBC() &&
3031 (block_at(s.cur_bci()) == nullptr || block_at(s.cur_bci()) == block())) {
3032 assert(state()->kind() == ValueStack::Parsing, "invalid state kind");
3033
3034 if (log != nullptr)
3035 log->set_context("bc code='%d' bci='%d'", (int)code, s.cur_bci());
3036
3037 // Check for active jsr during OSR compilation
3038 if (compilation()->is_osr_compile()
3039 && scope()->is_top_scope()
3040 && parsing_jsr()
3041 && s.cur_bci() == compilation()->osr_bci()) {
3042 bailout("OSR not supported while a jsr is active");
3043 }
3044
3045 if (push_exception) {
3046 apush(append(new ExceptionObject()));
3047 push_exception = false;
3048 }
3049
3050 // handle bytecode
3051 switch (code) {
3052 case Bytecodes::_nop : /* nothing to do */ break;
3053 case Bytecodes::_aconst_null : apush(append(new Constant(objectNull ))); break;
3054 case Bytecodes::_iconst_m1 : ipush(append(new Constant(new IntConstant (-1)))); break;
3055 case Bytecodes::_iconst_0 : ipush(append(new Constant(intZero ))); break;
3056 case Bytecodes::_iconst_1 : ipush(append(new Constant(intOne ))); break;
3057 case Bytecodes::_iconst_2 : ipush(append(new Constant(new IntConstant ( 2)))); break;
3058 case Bytecodes::_iconst_3 : ipush(append(new Constant(new IntConstant ( 3)))); break;
3059 case Bytecodes::_iconst_4 : ipush(append(new Constant(new IntConstant ( 4)))); break;
3060 case Bytecodes::_iconst_5 : ipush(append(new Constant(new IntConstant ( 5)))); break;
3061 case Bytecodes::_lconst_0 : lpush(append(new Constant(new LongConstant ( 0)))); break;
3062 case Bytecodes::_lconst_1 : lpush(append(new Constant(new LongConstant ( 1)))); break;
3063 case Bytecodes::_fconst_0 : fpush(append(new Constant(new FloatConstant ( 0)))); break;
3064 case Bytecodes::_fconst_1 : fpush(append(new Constant(new FloatConstant ( 1)))); break;
3065 case Bytecodes::_fconst_2 : fpush(append(new Constant(new FloatConstant ( 2)))); break;
3066 case Bytecodes::_dconst_0 : dpush(append(new Constant(new DoubleConstant( 0)))); break;
3067 case Bytecodes::_dconst_1 : dpush(append(new Constant(new DoubleConstant( 1)))); break;
3068 case Bytecodes::_bipush : ipush(append(new Constant(new IntConstant(((signed char*)s.cur_bcp())[1])))); break;
3069 case Bytecodes::_sipush : ipush(append(new Constant(new IntConstant((short)Bytes::get_Java_u2(s.cur_bcp()+1))))); break;
3070 case Bytecodes::_ldc : // fall through
3071 case Bytecodes::_ldc_w : // fall through
3072 case Bytecodes::_ldc2_w : load_constant(); break;
3073 case Bytecodes::_iload : load_local(intType , s.get_index()); break;
3074 case Bytecodes::_lload : load_local(longType , s.get_index()); break;
3075 case Bytecodes::_fload : load_local(floatType , s.get_index()); break;
3076 case Bytecodes::_dload : load_local(doubleType , s.get_index()); break;
3077 case Bytecodes::_aload : load_local(instanceType, s.get_index()); break;
3078 case Bytecodes::_iload_0 : load_local(intType , 0); break;
3079 case Bytecodes::_iload_1 : load_local(intType , 1); break;
3080 case Bytecodes::_iload_2 : load_local(intType , 2); break;
3081 case Bytecodes::_iload_3 : load_local(intType , 3); break;
3082 case Bytecodes::_lload_0 : load_local(longType , 0); break;
3083 case Bytecodes::_lload_1 : load_local(longType , 1); break;
3084 case Bytecodes::_lload_2 : load_local(longType , 2); break;
3085 case Bytecodes::_lload_3 : load_local(longType , 3); break;
3086 case Bytecodes::_fload_0 : load_local(floatType , 0); break;
3087 case Bytecodes::_fload_1 : load_local(floatType , 1); break;
3088 case Bytecodes::_fload_2 : load_local(floatType , 2); break;
3089 case Bytecodes::_fload_3 : load_local(floatType , 3); break;
3090 case Bytecodes::_dload_0 : load_local(doubleType, 0); break;
3091 case Bytecodes::_dload_1 : load_local(doubleType, 1); break;
3092 case Bytecodes::_dload_2 : load_local(doubleType, 2); break;
3093 case Bytecodes::_dload_3 : load_local(doubleType, 3); break;
3094 case Bytecodes::_aload_0 : load_local(objectType, 0); break;
3095 case Bytecodes::_aload_1 : load_local(objectType, 1); break;
3096 case Bytecodes::_aload_2 : load_local(objectType, 2); break;
3097 case Bytecodes::_aload_3 : load_local(objectType, 3); break;
3098 case Bytecodes::_iaload : load_indexed(T_INT ); break;
3099 case Bytecodes::_laload : load_indexed(T_LONG ); break;
3100 case Bytecodes::_faload : load_indexed(T_FLOAT ); break;
3101 case Bytecodes::_daload : load_indexed(T_DOUBLE); break;
3102 case Bytecodes::_aaload : load_indexed(T_OBJECT); break;
3103 case Bytecodes::_baload : load_indexed(T_BYTE ); break;
3104 case Bytecodes::_caload : load_indexed(T_CHAR ); break;
3105 case Bytecodes::_saload : load_indexed(T_SHORT ); break;
3106 case Bytecodes::_istore : store_local(intType , s.get_index()); break;
3107 case Bytecodes::_lstore : store_local(longType , s.get_index()); break;
3108 case Bytecodes::_fstore : store_local(floatType , s.get_index()); break;
3109 case Bytecodes::_dstore : store_local(doubleType, s.get_index()); break;
3110 case Bytecodes::_astore : store_local(objectType, s.get_index()); break;
3111 case Bytecodes::_istore_0 : store_local(intType , 0); break;
3112 case Bytecodes::_istore_1 : store_local(intType , 1); break;
3113 case Bytecodes::_istore_2 : store_local(intType , 2); break;
3114 case Bytecodes::_istore_3 : store_local(intType , 3); break;
3115 case Bytecodes::_lstore_0 : store_local(longType , 0); break;
3116 case Bytecodes::_lstore_1 : store_local(longType , 1); break;
3117 case Bytecodes::_lstore_2 : store_local(longType , 2); break;
3118 case Bytecodes::_lstore_3 : store_local(longType , 3); break;
3119 case Bytecodes::_fstore_0 : store_local(floatType , 0); break;
3120 case Bytecodes::_fstore_1 : store_local(floatType , 1); break;
3121 case Bytecodes::_fstore_2 : store_local(floatType , 2); break;
3122 case Bytecodes::_fstore_3 : store_local(floatType , 3); break;
3123 case Bytecodes::_dstore_0 : store_local(doubleType, 0); break;
3124 case Bytecodes::_dstore_1 : store_local(doubleType, 1); break;
3125 case Bytecodes::_dstore_2 : store_local(doubleType, 2); break;
3126 case Bytecodes::_dstore_3 : store_local(doubleType, 3); break;
3127 case Bytecodes::_astore_0 : store_local(objectType, 0); break;
3128 case Bytecodes::_astore_1 : store_local(objectType, 1); break;
3129 case Bytecodes::_astore_2 : store_local(objectType, 2); break;
3130 case Bytecodes::_astore_3 : store_local(objectType, 3); break;
3131 case Bytecodes::_iastore : store_indexed(T_INT ); break;
3132 case Bytecodes::_lastore : store_indexed(T_LONG ); break;
3133 case Bytecodes::_fastore : store_indexed(T_FLOAT ); break;
3134 case Bytecodes::_dastore : store_indexed(T_DOUBLE); break;
3135 case Bytecodes::_aastore : store_indexed(T_OBJECT); break;
3136 case Bytecodes::_bastore : store_indexed(T_BYTE ); break;
3137 case Bytecodes::_castore : store_indexed(T_CHAR ); break;
3138 case Bytecodes::_sastore : store_indexed(T_SHORT ); break;
3139 case Bytecodes::_pop : // fall through
3140 case Bytecodes::_pop2 : // fall through
3141 case Bytecodes::_dup : // fall through
3142 case Bytecodes::_dup_x1 : // fall through
3143 case Bytecodes::_dup_x2 : // fall through
3144 case Bytecodes::_dup2 : // fall through
3145 case Bytecodes::_dup2_x1 : // fall through
3146 case Bytecodes::_dup2_x2 : // fall through
3147 case Bytecodes::_swap : stack_op(code); break;
3148 case Bytecodes::_iadd : arithmetic_op(intType , code); break;
3149 case Bytecodes::_ladd : arithmetic_op(longType , code); break;
3150 case Bytecodes::_fadd : arithmetic_op(floatType , code); break;
3151 case Bytecodes::_dadd : arithmetic_op(doubleType, code); break;
3152 case Bytecodes::_isub : arithmetic_op(intType , code); break;
3153 case Bytecodes::_lsub : arithmetic_op(longType , code); break;
3154 case Bytecodes::_fsub : arithmetic_op(floatType , code); break;
3155 case Bytecodes::_dsub : arithmetic_op(doubleType, code); break;
3156 case Bytecodes::_imul : arithmetic_op(intType , code); break;
3157 case Bytecodes::_lmul : arithmetic_op(longType , code); break;
3158 case Bytecodes::_fmul : arithmetic_op(floatType , code); break;
3159 case Bytecodes::_dmul : arithmetic_op(doubleType, code); break;
3160 case Bytecodes::_idiv : arithmetic_op(intType , code, copy_state_for_exception()); break;
3161 case Bytecodes::_ldiv : arithmetic_op(longType , code, copy_state_for_exception()); break;
3162 case Bytecodes::_fdiv : arithmetic_op(floatType , code); break;
3163 case Bytecodes::_ddiv : arithmetic_op(doubleType, code); break;
3164 case Bytecodes::_irem : arithmetic_op(intType , code, copy_state_for_exception()); break;
3165 case Bytecodes::_lrem : arithmetic_op(longType , code, copy_state_for_exception()); break;
3166 case Bytecodes::_frem : arithmetic_op(floatType , code); break;
3167 case Bytecodes::_drem : arithmetic_op(doubleType, code); break;
3168 case Bytecodes::_ineg : negate_op(intType ); break;
3169 case Bytecodes::_lneg : negate_op(longType ); break;
3170 case Bytecodes::_fneg : negate_op(floatType ); break;
3171 case Bytecodes::_dneg : negate_op(doubleType); break;
3172 case Bytecodes::_ishl : shift_op(intType , code); break;
3173 case Bytecodes::_lshl : shift_op(longType, code); break;
3174 case Bytecodes::_ishr : shift_op(intType , code); break;
3175 case Bytecodes::_lshr : shift_op(longType, code); break;
3176 case Bytecodes::_iushr : shift_op(intType , code); break;
3177 case Bytecodes::_lushr : shift_op(longType, code); break;
3178 case Bytecodes::_iand : logic_op(intType , code); break;
3179 case Bytecodes::_land : logic_op(longType, code); break;
3180 case Bytecodes::_ior : logic_op(intType , code); break;
3181 case Bytecodes::_lor : logic_op(longType, code); break;
3182 case Bytecodes::_ixor : logic_op(intType , code); break;
3183 case Bytecodes::_lxor : logic_op(longType, code); break;
3184 case Bytecodes::_iinc : increment(); break;
3185 case Bytecodes::_i2l : convert(code, T_INT , T_LONG ); break;
3186 case Bytecodes::_i2f : convert(code, T_INT , T_FLOAT ); break;
3187 case Bytecodes::_i2d : convert(code, T_INT , T_DOUBLE); break;
3188 case Bytecodes::_l2i : convert(code, T_LONG , T_INT ); break;
3189 case Bytecodes::_l2f : convert(code, T_LONG , T_FLOAT ); break;
3190 case Bytecodes::_l2d : convert(code, T_LONG , T_DOUBLE); break;
3191 case Bytecodes::_f2i : convert(code, T_FLOAT , T_INT ); break;
3192 case Bytecodes::_f2l : convert(code, T_FLOAT , T_LONG ); break;
3193 case Bytecodes::_f2d : convert(code, T_FLOAT , T_DOUBLE); break;
3194 case Bytecodes::_d2i : convert(code, T_DOUBLE, T_INT ); break;
3195 case Bytecodes::_d2l : convert(code, T_DOUBLE, T_LONG ); break;
3196 case Bytecodes::_d2f : convert(code, T_DOUBLE, T_FLOAT ); break;
3197 case Bytecodes::_i2b : convert(code, T_INT , T_BYTE ); break;
3198 case Bytecodes::_i2c : convert(code, T_INT , T_CHAR ); break;
3199 case Bytecodes::_i2s : convert(code, T_INT , T_SHORT ); break;
3200 case Bytecodes::_lcmp : compare_op(longType , code); break;
3201 case Bytecodes::_fcmpl : compare_op(floatType , code); break;
3202 case Bytecodes::_fcmpg : compare_op(floatType , code); break;
3203 case Bytecodes::_dcmpl : compare_op(doubleType, code); break;
3204 case Bytecodes::_dcmpg : compare_op(doubleType, code); break;
3205 case Bytecodes::_ifeq : if_zero(intType , If::eql); break;
3206 case Bytecodes::_ifne : if_zero(intType , If::neq); break;
3207 case Bytecodes::_iflt : if_zero(intType , If::lss); break;
3208 case Bytecodes::_ifge : if_zero(intType , If::geq); break;
3209 case Bytecodes::_ifgt : if_zero(intType , If::gtr); break;
3210 case Bytecodes::_ifle : if_zero(intType , If::leq); break;
3211 case Bytecodes::_if_icmpeq : if_same(intType , If::eql); break;
3212 case Bytecodes::_if_icmpne : if_same(intType , If::neq); break;
3213 case Bytecodes::_if_icmplt : if_same(intType , If::lss); break;
3214 case Bytecodes::_if_icmpge : if_same(intType , If::geq); break;
3215 case Bytecodes::_if_icmpgt : if_same(intType , If::gtr); break;
3216 case Bytecodes::_if_icmple : if_same(intType , If::leq); break;
3217 case Bytecodes::_if_acmpeq : if_same(objectType, If::eql); break;
3218 case Bytecodes::_if_acmpne : if_same(objectType, If::neq); break;
3219 case Bytecodes::_goto : _goto(s.cur_bci(), s.get_dest()); break;
3220 case Bytecodes::_jsr : jsr(s.get_dest()); break;
3221 case Bytecodes::_ret : ret(s.get_index()); break;
3222 case Bytecodes::_tableswitch : table_switch(); break;
3223 case Bytecodes::_lookupswitch : lookup_switch(); break;
3224 case Bytecodes::_ireturn : method_return(ipop(), ignore_return); break;
3225 case Bytecodes::_lreturn : method_return(lpop(), ignore_return); break;
3226 case Bytecodes::_freturn : method_return(fpop(), ignore_return); break;
3227 case Bytecodes::_dreturn : method_return(dpop(), ignore_return); break;
3228 case Bytecodes::_areturn : method_return(apop(), ignore_return); break;
3229 case Bytecodes::_return : method_return(nullptr, ignore_return); break;
3230 case Bytecodes::_getstatic : // fall through
3231 case Bytecodes::_putstatic : // fall through
3232 case Bytecodes::_getfield : // fall through
3233 case Bytecodes::_putfield : access_field(code); break;
3234 case Bytecodes::_invokevirtual : // fall through
3235 case Bytecodes::_invokespecial : // fall through
3236 case Bytecodes::_invokestatic : // fall through
3237 case Bytecodes::_invokedynamic : // fall through
3238 case Bytecodes::_invokeinterface: invoke(code); break;
3239 case Bytecodes::_new : new_instance(s.get_index_u2()); break;
3240 case Bytecodes::_newarray : new_type_array(); break;
3241 case Bytecodes::_anewarray : new_object_array(); break;
3242 case Bytecodes::_arraylength : { ValueStack* state_before = copy_state_for_exception(); ipush(append(new ArrayLength(apop(), state_before))); break; }
3243 case Bytecodes::_athrow : throw_op(s.cur_bci()); break;
3244 case Bytecodes::_checkcast : check_cast(s.get_index_u2()); break;
3245 case Bytecodes::_instanceof : instance_of(s.get_index_u2()); break;
3246 case Bytecodes::_monitorenter : monitorenter(apop(), s.cur_bci()); break;
3247 case Bytecodes::_monitorexit : monitorexit (apop(), s.cur_bci()); break;
3248 case Bytecodes::_wide : ShouldNotReachHere(); break;
3249 case Bytecodes::_multianewarray : new_multi_array(s.cur_bcp()[3]); break;
3250 case Bytecodes::_ifnull : if_null(objectType, If::eql); break;
3251 case Bytecodes::_ifnonnull : if_null(objectType, If::neq); break;
3252 case Bytecodes::_goto_w : _goto(s.cur_bci(), s.get_far_dest()); break;
3253 case Bytecodes::_jsr_w : jsr(s.get_far_dest()); break;
3254 case Bytecodes::_breakpoint : BAILOUT_("concurrent setting of breakpoint", nullptr);
3255 default : ShouldNotReachHere(); break;
3256 }
3257
3258 if (log != nullptr)
3259 log->clear_context(); // skip marker if nothing was printed
3260
3261 // save current bci to setup Goto at the end
3262 prev_bci = s.cur_bci();
3263
3264 }
3265 CHECK_BAILOUT_(nullptr);
3266 // stop processing of this block (see try_inline_full)
3267 if (_skip_block) {
3268 _skip_block = false;
3269 assert(_last && _last->as_BlockEnd(), "");
3270 return _last->as_BlockEnd();
3271 }
3272 // if there are any, check if last instruction is a BlockEnd instruction
3273 BlockEnd* end = last()->as_BlockEnd();
3274 if (end == nullptr) {
3275 // all blocks must end with a BlockEnd instruction => add a Goto
3276 end = new Goto(block_at(s.cur_bci()), false);
3277 append(end);
3278 }
3279 assert(end == last()->as_BlockEnd(), "inconsistency");
3280
3281 assert(end->state() != nullptr, "state must already be present");
3282 assert(end->as_Return() == nullptr || end->as_Throw() == nullptr || end->state()->stack_size() == 0, "stack not needed for return and throw");
3283
3284 // connect to begin & set state
3285 // NOTE that inlining may have changed the block we are parsing
3286 block()->set_end(end);
3287 // propagate state
3288 for (int i = end->number_of_sux() - 1; i >= 0; i--) {
3289 BlockBegin* sux = end->sux_at(i);
3290 assert(sux->is_predecessor(block()), "predecessor missing");
3291 // be careful, bailout if bytecodes are strange
3292 if (!sux->try_merge(end->state(), compilation()->has_irreducible_loops())) BAILOUT_("block join failed", nullptr);
3293 scope_data()->add_to_work_list(end->sux_at(i));
3294 }
3295
3296 scope_data()->set_stream(nullptr);
3297
3298 // done
3299 return end;
3300 }
3301
3302
3303 void GraphBuilder::iterate_all_blocks(bool start_in_current_block_for_inlining) {
3304 do {
3305 if (start_in_current_block_for_inlining && !bailed_out()) {
3306 iterate_bytecodes_for_block(0);
3307 start_in_current_block_for_inlining = false;
3308 } else {
3309 BlockBegin* b;
3310 while ((b = scope_data()->remove_from_work_list()) != nullptr) {
3311 if (!b->is_set(BlockBegin::was_visited_flag)) {
3312 if (b->is_set(BlockBegin::osr_entry_flag)) {
3313 // we're about to parse the osr entry block, so make sure
3314 // we setup the OSR edge leading into this block so that
3315 // Phis get setup correctly.
3316 setup_osr_entry_block();
3317 // this is no longer the osr entry block, so clear it.
3318 b->clear(BlockBegin::osr_entry_flag);
3319 }
3320 b->set(BlockBegin::was_visited_flag);
3321 connect_to_end(b);
3322 }
3323 }
3324 }
3325 } while (!bailed_out() && !scope_data()->is_work_list_empty());
3326 }
3327
3328
3329 bool GraphBuilder::_can_trap [Bytecodes::number_of_java_codes];
3330
3331 void GraphBuilder::initialize() {
3332 // the following bytecodes are assumed to potentially
3333 // throw exceptions in compiled code - note that e.g.
3334 // monitorexit & the return bytecodes do not throw
3335 // exceptions since monitor pairing proved that they
3336 // succeed (if monitor pairing succeeded)
3337 Bytecodes::Code can_trap_list[] =
3338 { Bytecodes::_ldc
3339 , Bytecodes::_ldc_w
3340 , Bytecodes::_ldc2_w
3341 , Bytecodes::_iaload
3342 , Bytecodes::_laload
3343 , Bytecodes::_faload
3344 , Bytecodes::_daload
3345 , Bytecodes::_aaload
3346 , Bytecodes::_baload
3347 , Bytecodes::_caload
3348 , Bytecodes::_saload
3349 , Bytecodes::_iastore
3350 , Bytecodes::_lastore
3351 , Bytecodes::_fastore
3352 , Bytecodes::_dastore
3353 , Bytecodes::_aastore
3354 , Bytecodes::_bastore
3355 , Bytecodes::_castore
3356 , Bytecodes::_sastore
3357 , Bytecodes::_idiv
3358 , Bytecodes::_ldiv
3359 , Bytecodes::_irem
3360 , Bytecodes::_lrem
3361 , Bytecodes::_getstatic
3362 , Bytecodes::_putstatic
3363 , Bytecodes::_getfield
3364 , Bytecodes::_putfield
3365 , Bytecodes::_invokevirtual
3366 , Bytecodes::_invokespecial
3367 , Bytecodes::_invokestatic
3368 , Bytecodes::_invokedynamic
3369 , Bytecodes::_invokeinterface
3370 , Bytecodes::_new
3371 , Bytecodes::_newarray
3372 , Bytecodes::_anewarray
3373 , Bytecodes::_arraylength
3374 , Bytecodes::_athrow
3375 , Bytecodes::_checkcast
3376 , Bytecodes::_instanceof
3377 , Bytecodes::_monitorenter
3378 , Bytecodes::_multianewarray
3379 };
3380
3381 // inititialize trap tables
3382 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) {
3383 _can_trap[i] = false;
3384 }
3385 // set standard trap info
3386 for (uint j = 0; j < ARRAY_SIZE(can_trap_list); j++) {
3387 _can_trap[can_trap_list[j]] = true;
3388 }
3389 }
3390
3391
3392 BlockBegin* GraphBuilder::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) {
3393 assert(entry->is_set(f), "entry/flag mismatch");
3394 // create header block
3395 BlockBegin* h = new BlockBegin(entry->bci());
3396 h->set_depth_first_number(0);
3397
3398 Value l = h;
3399 BlockEnd* g = new Goto(entry, false);
3400 l->set_next(g, entry->bci());
3401 h->set_end(g);
3402 h->set(f);
3403 // setup header block end state
3404 ValueStack* s = state->copy(ValueStack::StateAfter, entry->bci()); // can use copy since stack is empty (=> no phis)
3405 assert(s->stack_is_empty(), "must have empty stack at entry point");
3406 g->set_state(s);
3407 return h;
3408 }
3409
3410
3411
3412 BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* state) {
3413 BlockBegin* start = new BlockBegin(0);
3414
3415 // This code eliminates the empty start block at the beginning of
3416 // each method. Previously, each method started with the
3417 // start-block created below, and this block was followed by the
3418 // header block that was always empty. This header block is only
3419 // necessary if std_entry is also a backward branch target because
3420 // then phi functions may be necessary in the header block. It's
3421 // also necessary when profiling so that there's a single block that
3422 // can increment the counters.
3423 // In addition, with range check elimination, we may need a valid block
3424 // that dominates all the rest to insert range predicates.
3425 BlockBegin* new_header_block;
3426 if (std_entry->number_of_preds() > 0 || is_profiling() || RangeCheckElimination) {
3427 new_header_block = header_block(std_entry, BlockBegin::std_entry_flag, state);
3428 } else {
3429 new_header_block = std_entry;
3430 }
3431
3432 // setup start block (root for the IR graph)
3433 Base* base =
3434 new Base(
3435 new_header_block,
3436 osr_entry
3437 );
3438 start->set_next(base, 0);
3439 start->set_end(base);
3440 // create & setup state for start block
3441 start->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
3442 base->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
3443
3444 if (base->std_entry()->state() == nullptr) {
3445 // setup states for header blocks
3446 base->std_entry()->merge(state, compilation()->has_irreducible_loops());
3447 }
3448
3449 assert(base->std_entry()->state() != nullptr, "");
3450 return start;
3451 }
3452
3453
3454 void GraphBuilder::setup_osr_entry_block() {
3455 assert(compilation()->is_osr_compile(), "only for osrs");
3456
3457 int osr_bci = compilation()->osr_bci();
3458 ciBytecodeStream s(method());
3459 s.reset_to_bci(osr_bci);
3460 s.next();
3461 scope_data()->set_stream(&s);
3462
3463 // create a new block to be the osr setup code
3464 _osr_entry = new BlockBegin(osr_bci);
3465 _osr_entry->set(BlockBegin::osr_entry_flag);
3466 _osr_entry->set_depth_first_number(0);
3467 BlockBegin* target = bci2block()->at(osr_bci);
3468 assert(target != nullptr && target->is_set(BlockBegin::osr_entry_flag), "must be there");
3469 // the osr entry has no values for locals
3470 ValueStack* state = target->state()->copy();
3471 _osr_entry->set_state(state);
3472
3473 kill_all();
3474 _block = _osr_entry;
3475 _state = _osr_entry->state()->copy();
3476 assert(_state->bci() == osr_bci, "mismatch");
3477 _last = _osr_entry;
3478 Value e = append(new OsrEntry());
3479 e->set_needs_null_check(false);
3480
3481 // OSR buffer is
3482 //
3483 // locals[nlocals-1..0]
3484 // monitors[number_of_locks-1..0]
3485 //
3486 // locals is a direct copy of the interpreter frame so in the osr buffer
3487 // so first slot in the local array is the last local from the interpreter
3488 // and last slot is local[0] (receiver) from the interpreter
3489 //
3490 // Similarly with locks. The first lock slot in the osr buffer is the nth lock
3491 // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock
3492 // in the interpreter frame (the method lock if a sync method)
3493
3494 // Initialize monitors in the compiled activation.
3495
3496 int index;
3497 Value local;
3498
3499 // find all the locals that the interpreter thinks contain live oops
3500 const ResourceBitMap live_oops = method()->live_local_oops_at_bci(osr_bci);
3501
3502 // compute the offset into the locals so that we can treat the buffer
3503 // as if the locals were still in the interpreter frame
3504 int locals_offset = BytesPerWord * (method()->max_locals() - 1);
3505 for_each_local_value(state, index, local) {
3506 int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord;
3507 Value get;
3508 if (local->type()->is_object_kind() && !live_oops.at(index)) {
3509 // The interpreter thinks this local is dead but the compiler
3510 // doesn't so pretend that the interpreter passed in null.
3511 get = append(new Constant(objectNull));
3512 } else {
3513 Value off_val = append(new Constant(new IntConstant(offset)));
3514 get = append(new UnsafeGet(as_BasicType(local->type()), e,
3515 off_val,
3516 false/*is_volatile*/,
3517 true/*is_raw*/));
3518 }
3519 _state->store_local(index, get);
3520 }
3521
3522 // the storage for the OSR buffer is freed manually in the LIRGenerator.
3523
3524 assert(state->caller_state() == nullptr, "should be top scope");
3525 state->clear_locals();
3526 Goto* g = new Goto(target, false);
3527 append(g);
3528 _osr_entry->set_end(g);
3529 target->merge(_osr_entry->end()->state(), compilation()->has_irreducible_loops());
3530
3531 scope_data()->set_stream(nullptr);
3532 }
3533
3534
3535 ValueStack* GraphBuilder::state_at_entry() {
3536 ValueStack* state = new ValueStack(scope(), nullptr);
3537
3538 // Set up locals for receiver
3539 int idx = 0;
3540 if (!method()->is_static()) {
3541 // we should always see the receiver
3542 state->store_local(idx, new Local(method()->holder(), objectType, idx,
3543 /*receiver*/ true, /*null_free*/ method()->holder()->is_flat_array_klass()));
3544 idx = 1;
3545 }
3546
3547 // Set up locals for incoming arguments
3548 ciSignature* sig = method()->signature();
3549 for (int i = 0; i < sig->count(); i++) {
3550 ciType* type = sig->type_at(i);
3551 BasicType basic_type = type->basic_type();
3552 // don't allow T_ARRAY to propagate into locals types
3553 if (is_reference_type(basic_type)) basic_type = T_OBJECT;
3554 ValueType* vt = as_ValueType(basic_type);
3555 state->store_local(idx, new Local(type, vt, idx, false, false));
3556 idx += type->size();
3557 }
3558
3559 // lock synchronized method
3560 if (method()->is_synchronized()) {
3561 state->lock(nullptr);
3562 }
3563
3564 return state;
3565 }
3566
3567
3568 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope)
3569 : _scope_data(nullptr)
3570 , _compilation(compilation)
3571 , _memory(new MemoryBuffer())
3572 , _inline_bailout_msg(nullptr)
3573 , _instruction_count(0)
3574 , _osr_entry(nullptr)
3575 , _pending_field_access(nullptr)
3576 , _pending_load_indexed(nullptr)
3577 {
3578 int osr_bci = compilation->osr_bci();
3579
3580 // determine entry points and bci2block mapping
3581 BlockListBuilder blm(compilation, scope, osr_bci);
3582 CHECK_BAILOUT();
3583
3584 BlockList* bci2block = blm.bci2block();
3585 BlockBegin* start_block = bci2block->at(0);
3586
3587 push_root_scope(scope, bci2block, start_block);
3588
3589 // setup state for std entry
3590 _initial_state = state_at_entry();
3591 start_block->merge(_initial_state, compilation->has_irreducible_loops());
3592
3593 // End nulls still exist here
3594
3595 // complete graph
3596 _vmap = new ValueMap();
3597 switch (scope->method()->intrinsic_id()) {
3598 case vmIntrinsics::_dabs : // fall through
3599 case vmIntrinsics::_dsqrt : // fall through
3600 case vmIntrinsics::_dsqrt_strict : // fall through
3601 case vmIntrinsics::_dsin : // fall through
3602 case vmIntrinsics::_dcos : // fall through
3603 case vmIntrinsics::_dtan : // fall through
3604 case vmIntrinsics::_dlog : // fall through
3605 case vmIntrinsics::_dlog10 : // fall through
3606 case vmIntrinsics::_dexp : // fall through
3607 case vmIntrinsics::_dpow : // fall through
3608 {
3609 // Compiles where the root method is an intrinsic need a special
3610 // compilation environment because the bytecodes for the method
3611 // shouldn't be parsed during the compilation, only the special
3612 // Intrinsic node should be emitted. If this isn't done the
3613 // code for the inlined version will be different than the root
3614 // compiled version which could lead to monotonicity problems on
3615 // intel.
3616 if (CheckIntrinsics && !scope->method()->intrinsic_candidate()) {
3617 BAILOUT("failed to inline intrinsic, method not annotated");
3618 }
3619
3620 // Set up a stream so that appending instructions works properly.
3621 ciBytecodeStream s(scope->method());
3622 s.reset_to_bci(0);
3623 scope_data()->set_stream(&s);
3624 s.next();
3625
3626 // setup the initial block state
3627 _block = start_block;
3628 _state = start_block->state()->copy_for_parsing();
3629 _last = start_block;
3630 load_local(doubleType, 0);
3631 if (scope->method()->intrinsic_id() == vmIntrinsics::_dpow) {
3632 load_local(doubleType, 2);
3633 }
3634
3635 // Emit the intrinsic node.
3636 bool result = try_inline_intrinsics(scope->method());
3637 if (!result) BAILOUT("failed to inline intrinsic");
3638 method_return(dpop());
3639
3640 // connect the begin and end blocks and we're all done.
3641 BlockEnd* end = last()->as_BlockEnd();
3642 block()->set_end(end);
3643 break;
3644 }
3645
3646 case vmIntrinsics::_Reference_get:
3647 {
3648 {
3649 // With java.lang.ref.reference.get() we must go through the
3650 // intrinsic - when G1 is enabled - even when get() is the root
3651 // method of the compile so that, if necessary, the value in
3652 // the referent field of the reference object gets recorded by
3653 // the pre-barrier code.
3654 // Specifically, if G1 is enabled, the value in the referent
3655 // field is recorded by the G1 SATB pre barrier. This will
3656 // result in the referent being marked live and the reference
3657 // object removed from the list of discovered references during
3658 // reference processing.
3659 if (CheckIntrinsics && !scope->method()->intrinsic_candidate()) {
3660 BAILOUT("failed to inline intrinsic, method not annotated");
3661 }
3662
3663 // Also we need intrinsic to prevent commoning reads from this field
3664 // across safepoint since GC can change its value.
3665
3666 // Set up a stream so that appending instructions works properly.
3667 ciBytecodeStream s(scope->method());
3668 s.reset_to_bci(0);
3669 scope_data()->set_stream(&s);
3670 s.next();
3671
3672 // setup the initial block state
3673 _block = start_block;
3674 _state = start_block->state()->copy_for_parsing();
3675 _last = start_block;
3676 load_local(objectType, 0);
3677
3678 // Emit the intrinsic node.
3679 bool result = try_inline_intrinsics(scope->method());
3680 if (!result) BAILOUT("failed to inline intrinsic");
3681 method_return(apop());
3682
3683 // connect the begin and end blocks and we're all done.
3684 BlockEnd* end = last()->as_BlockEnd();
3685 block()->set_end(end);
3686 break;
3687 }
3688 // Otherwise, fall thru
3689 }
3690
3691 default:
3692 scope_data()->add_to_work_list(start_block);
3693 iterate_all_blocks();
3694 break;
3695 }
3696 CHECK_BAILOUT();
3697
3698 # ifdef ASSERT
3699 // For all blocks reachable from start_block: _end must be non-null
3700 {
3701 BlockList processed;
3702 BlockList to_go;
3703 to_go.append(start_block);
3704 while(to_go.length() > 0) {
3705 BlockBegin* current = to_go.pop();
3706 assert(current != nullptr, "Should not happen.");
3707 assert(current->end() != nullptr, "All blocks reachable from start_block should have end() != nullptr.");
3708 processed.append(current);
3709 for(int i = 0; i < current->number_of_sux(); i++) {
3710 BlockBegin* s = current->sux_at(i);
3711 if (!processed.contains(s)) {
3712 to_go.append(s);
3713 }
3714 }
3715 }
3716 }
3717 #endif // ASSERT
3718
3719 _start = setup_start_block(osr_bci, start_block, _osr_entry, _initial_state);
3720
3721 eliminate_redundant_phis(_start);
3722
3723 NOT_PRODUCT(if (PrintValueNumbering && Verbose) print_stats());
3724 // for osr compile, bailout if some requirements are not fulfilled
3725 if (osr_bci != -1) {
3726 BlockBegin* osr_block = blm.bci2block()->at(osr_bci);
3727 if (!osr_block->is_set(BlockBegin::was_visited_flag)) {
3728 BAILOUT("osr entry must have been visited for osr compile");
3729 }
3730
3731 // check if osr entry point has empty stack - we cannot handle non-empty stacks at osr entry points
3732 if (!osr_block->state()->stack_is_empty()) {
3733 BAILOUT("stack not empty at OSR entry point");
3734 }
3735 }
3736 #ifndef PRODUCT
3737 if (PrintCompilation && Verbose) tty->print_cr("Created %d Instructions", _instruction_count);
3738 #endif
3739 }
3740
3741
3742 ValueStack* GraphBuilder::copy_state_before() {
3743 return copy_state_before_with_bci(bci());
3744 }
3745
3746 ValueStack* GraphBuilder::copy_state_exhandling() {
3747 return copy_state_exhandling_with_bci(bci());
3748 }
3749
3750 ValueStack* GraphBuilder::copy_state_for_exception() {
3751 return copy_state_for_exception_with_bci(bci());
3752 }
3753
3754 ValueStack* GraphBuilder::copy_state_before_with_bci(int bci) {
3755 return state()->copy(ValueStack::StateBefore, bci);
3756 }
3757
3758 ValueStack* GraphBuilder::copy_state_exhandling_with_bci(int bci) {
3759 if (!has_handler()) return nullptr;
3760 return state()->copy(ValueStack::StateBefore, bci);
3761 }
3762
3763 ValueStack* GraphBuilder::copy_state_for_exception_with_bci(int bci) {
3764 ValueStack* s = copy_state_exhandling_with_bci(bci);
3765 if (s == nullptr) {
3766 // no handler, no need to retain locals
3767 ValueStack::Kind exc_kind = ValueStack::empty_exception_kind();
3768 s = state()->copy(exc_kind, bci);
3769 }
3770 return s;
3771 }
3772
3773 int GraphBuilder::recursive_inline_level(ciMethod* cur_callee) const {
3774 int recur_level = 0;
3775 for (IRScope* s = scope(); s != nullptr; s = s->caller()) {
3776 if (s->method() == cur_callee) {
3777 ++recur_level;
3778 }
3779 }
3780 return recur_level;
3781 }
3782
3783 bool GraphBuilder::try_inline(ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc, Value receiver) {
3784 const char* msg = nullptr;
3785
3786 // clear out any existing inline bailout condition
3787 clear_inline_bailout();
3788
3789 // exclude methods we don't want to inline
3790 msg = should_not_inline(callee);
3791 if (msg != nullptr) {
3792 print_inlining(callee, msg, /*success*/ false);
3793 return false;
3794 }
3795
3796 // method handle invokes
3797 if (callee->is_method_handle_intrinsic()) {
3798 if (try_method_handle_inline(callee, ignore_return)) {
3799 if (callee->has_reserved_stack_access()) {
3800 compilation()->set_has_reserved_stack_access(true);
3801 }
3802 return true;
3803 }
3804 return false;
3805 }
3806
3807 // handle intrinsics
3808 if (callee->intrinsic_id() != vmIntrinsics::_none &&
3809 callee->check_intrinsic_candidate()) {
3810 if (try_inline_intrinsics(callee, ignore_return)) {
3811 print_inlining(callee, "intrinsic");
3812 if (callee->has_reserved_stack_access()) {
3813 compilation()->set_has_reserved_stack_access(true);
3814 }
3815 return true;
3816 }
3817 // try normal inlining
3818 }
3819
3820 // certain methods cannot be parsed at all
3821 msg = check_can_parse(callee);
3822 if (msg != nullptr) {
3823 print_inlining(callee, msg, /*success*/ false);
3824 return false;
3825 }
3826
3827 // If bytecode not set use the current one.
3828 if (bc == Bytecodes::_illegal) {
3829 bc = code();
3830 }
3831 if (try_inline_full(callee, holder_known, ignore_return, bc, receiver)) {
3832 if (callee->has_reserved_stack_access()) {
3833 compilation()->set_has_reserved_stack_access(true);
3834 }
3835 return true;
3836 }
3837
3838 // Entire compilation could fail during try_inline_full call.
3839 // In that case printing inlining decision info is useless.
3840 if (!bailed_out())
3841 print_inlining(callee, _inline_bailout_msg, /*success*/ false);
3842
3843 return false;
3844 }
3845
3846
3847 const char* GraphBuilder::check_can_parse(ciMethod* callee) const {
3848 // Certain methods cannot be parsed at all:
3849 if ( callee->is_native()) return "native method";
3850 if ( callee->is_abstract()) return "abstract method";
3851 if (!callee->can_be_parsed()) return "cannot be parsed";
3852 return nullptr;
3853 }
3854
3855 // negative filter: should callee NOT be inlined? returns null, ok to inline, or rejection msg
3856 const char* GraphBuilder::should_not_inline(ciMethod* callee) const {
3857 if ( compilation()->directive()->should_not_inline(callee)) return "disallowed by CompileCommand";
3858 if ( callee->dont_inline()) return "don't inline by annotation";
3859 return nullptr;
3860 }
3861
3862 void GraphBuilder::build_graph_for_intrinsic(ciMethod* callee, bool ignore_return) {
3863 vmIntrinsics::ID id = callee->intrinsic_id();
3864 assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
3865
3866 // Some intrinsics need special IR nodes.
3867 switch(id) {
3868 case vmIntrinsics::_getReference : append_unsafe_get(callee, T_OBJECT, false); return;
3869 case vmIntrinsics::_getBoolean : append_unsafe_get(callee, T_BOOLEAN, false); return;
3870 case vmIntrinsics::_getByte : append_unsafe_get(callee, T_BYTE, false); return;
3871 case vmIntrinsics::_getShort : append_unsafe_get(callee, T_SHORT, false); return;
3872 case vmIntrinsics::_getChar : append_unsafe_get(callee, T_CHAR, false); return;
3873 case vmIntrinsics::_getInt : append_unsafe_get(callee, T_INT, false); return;
3874 case vmIntrinsics::_getLong : append_unsafe_get(callee, T_LONG, false); return;
3875 case vmIntrinsics::_getFloat : append_unsafe_get(callee, T_FLOAT, false); return;
3876 case vmIntrinsics::_getDouble : append_unsafe_get(callee, T_DOUBLE, false); return;
3877 case vmIntrinsics::_putReference : append_unsafe_put(callee, T_OBJECT, false); return;
3878 case vmIntrinsics::_putBoolean : append_unsafe_put(callee, T_BOOLEAN, false); return;
3879 case vmIntrinsics::_putByte : append_unsafe_put(callee, T_BYTE, false); return;
3880 case vmIntrinsics::_putShort : append_unsafe_put(callee, T_SHORT, false); return;
3881 case vmIntrinsics::_putChar : append_unsafe_put(callee, T_CHAR, false); return;
3882 case vmIntrinsics::_putInt : append_unsafe_put(callee, T_INT, false); return;
3883 case vmIntrinsics::_putLong : append_unsafe_put(callee, T_LONG, false); return;
3884 case vmIntrinsics::_putFloat : append_unsafe_put(callee, T_FLOAT, false); return;
3885 case vmIntrinsics::_putDouble : append_unsafe_put(callee, T_DOUBLE, false); return;
3886 case vmIntrinsics::_getShortUnaligned : append_unsafe_get(callee, T_SHORT, false); return;
3887 case vmIntrinsics::_getCharUnaligned : append_unsafe_get(callee, T_CHAR, false); return;
3888 case vmIntrinsics::_getIntUnaligned : append_unsafe_get(callee, T_INT, false); return;
3889 case vmIntrinsics::_getLongUnaligned : append_unsafe_get(callee, T_LONG, false); return;
3890 case vmIntrinsics::_putShortUnaligned : append_unsafe_put(callee, T_SHORT, false); return;
3891 case vmIntrinsics::_putCharUnaligned : append_unsafe_put(callee, T_CHAR, false); return;
3892 case vmIntrinsics::_putIntUnaligned : append_unsafe_put(callee, T_INT, false); return;
3893 case vmIntrinsics::_putLongUnaligned : append_unsafe_put(callee, T_LONG, false); return;
3894 case vmIntrinsics::_getReferenceVolatile : append_unsafe_get(callee, T_OBJECT, true); return;
3895 case vmIntrinsics::_getBooleanVolatile : append_unsafe_get(callee, T_BOOLEAN, true); return;
3896 case vmIntrinsics::_getByteVolatile : append_unsafe_get(callee, T_BYTE, true); return;
3897 case vmIntrinsics::_getShortVolatile : append_unsafe_get(callee, T_SHORT, true); return;
3898 case vmIntrinsics::_getCharVolatile : append_unsafe_get(callee, T_CHAR, true); return;
3899 case vmIntrinsics::_getIntVolatile : append_unsafe_get(callee, T_INT, true); return;
3900 case vmIntrinsics::_getLongVolatile : append_unsafe_get(callee, T_LONG, true); return;
3901 case vmIntrinsics::_getFloatVolatile : append_unsafe_get(callee, T_FLOAT, true); return;
3902 case vmIntrinsics::_getDoubleVolatile : append_unsafe_get(callee, T_DOUBLE, true); return;
3903 case vmIntrinsics::_putReferenceVolatile : append_unsafe_put(callee, T_OBJECT, true); return;
3904 case vmIntrinsics::_putBooleanVolatile : append_unsafe_put(callee, T_BOOLEAN, true); return;
3905 case vmIntrinsics::_putByteVolatile : append_unsafe_put(callee, T_BYTE, true); return;
3906 case vmIntrinsics::_putShortVolatile : append_unsafe_put(callee, T_SHORT, true); return;
3907 case vmIntrinsics::_putCharVolatile : append_unsafe_put(callee, T_CHAR, true); return;
3908 case vmIntrinsics::_putIntVolatile : append_unsafe_put(callee, T_INT, true); return;
3909 case vmIntrinsics::_putLongVolatile : append_unsafe_put(callee, T_LONG, true); return;
3910 case vmIntrinsics::_putFloatVolatile : append_unsafe_put(callee, T_FLOAT, true); return;
3911 case vmIntrinsics::_putDoubleVolatile : append_unsafe_put(callee, T_DOUBLE, true); return;
3912 case vmIntrinsics::_compareAndSetLong:
3913 case vmIntrinsics::_compareAndSetInt:
3914 case vmIntrinsics::_compareAndSetReference : append_unsafe_CAS(callee); return;
3915 case vmIntrinsics::_getAndAddInt:
3916 case vmIntrinsics::_getAndAddLong : append_unsafe_get_and_set(callee, true); return;
3917 case vmIntrinsics::_getAndSetInt :
3918 case vmIntrinsics::_getAndSetLong :
3919 case vmIntrinsics::_getAndSetReference : append_unsafe_get_and_set(callee, false); return;
3920 case vmIntrinsics::_getCharStringU : append_char_access(callee, false); return;
3921 case vmIntrinsics::_putCharStringU : append_char_access(callee, true); return;
3922 default:
3923 break;
3924 }
3925
3926 // create intrinsic node
3927 const bool has_receiver = !callee->is_static();
3928 ValueType* result_type = as_ValueType(callee->return_type());
3929 ValueStack* state_before = copy_state_for_exception();
3930
3931 Values* args = state()->pop_arguments(callee->arg_size());
3932
3933 if (is_profiling()) {
3934 // Don't profile in the special case where the root method
3935 // is the intrinsic
3936 if (callee != method()) {
3937 // Note that we'd collect profile data in this method if we wanted it.
3938 compilation()->set_would_profile(true);
3939 if (profile_calls()) {
3940 Value recv = nullptr;
3941 if (has_receiver) {
3942 recv = args->at(0);
3943 null_check(recv);
3944 }
3945 profile_call(callee, recv, nullptr, collect_args_for_profiling(args, callee, true), true);
3946 }
3947 }
3948 }
3949
3950 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(),
3951 args, has_receiver, state_before,
3952 vmIntrinsics::preserves_state(id),
3953 vmIntrinsics::can_trap(id));
3954 // append instruction & push result
3955 Value value = append_split(result);
3956 if (result_type != voidType && !ignore_return) {
3957 push(result_type, value);
3958 }
3959
3960 if (callee != method() && profile_return() && result_type->is_object_kind()) {
3961 profile_return_type(result, callee);
3962 }
3963 }
3964
3965 bool GraphBuilder::try_inline_intrinsics(ciMethod* callee, bool ignore_return) {
3966 // For calling is_intrinsic_available we need to transition to
3967 // the '_thread_in_vm' state because is_intrinsic_available()
3968 // accesses critical VM-internal data.
3969 bool is_available = false;
3970 {
3971 VM_ENTRY_MARK;
3972 methodHandle mh(THREAD, callee->get_Method());
3973 is_available = _compilation->compiler()->is_intrinsic_available(mh, _compilation->directive());
3974 }
3975
3976 if (!is_available) {
3977 if (!InlineNatives) {
3978 // Return false and also set message that the inlining of
3979 // intrinsics has been disabled in general.
3980 INLINE_BAILOUT("intrinsic method inlining disabled");
3981 } else {
3982 return false;
3983 }
3984 }
3985 build_graph_for_intrinsic(callee, ignore_return);
3986 return true;
3987 }
3988
3989
3990 bool GraphBuilder::try_inline_jsr(int jsr_dest_bci) {
3991 // Introduce a new callee continuation point - all Ret instructions
3992 // will be replaced with Gotos to this point.
3993 BlockBegin* cont = block_at(next_bci());
3994 assert(cont != nullptr, "continuation must exist (BlockListBuilder starts a new block after a jsr");
3995
3996 // Note: can not assign state to continuation yet, as we have to
3997 // pick up the state from the Ret instructions.
3998
3999 // Push callee scope
4000 push_scope_for_jsr(cont, jsr_dest_bci);
4001
4002 // Temporarily set up bytecode stream so we can append instructions
4003 // (only using the bci of this stream)
4004 scope_data()->set_stream(scope_data()->parent()->stream());
4005
4006 BlockBegin* jsr_start_block = block_at(jsr_dest_bci);
4007 assert(jsr_start_block != nullptr, "jsr start block must exist");
4008 assert(!jsr_start_block->is_set(BlockBegin::was_visited_flag), "should not have visited jsr yet");
4009 Goto* goto_sub = new Goto(jsr_start_block, false);
4010 // Must copy state to avoid wrong sharing when parsing bytecodes
4011 assert(jsr_start_block->state() == nullptr, "should have fresh jsr starting block");
4012 jsr_start_block->set_state(copy_state_before_with_bci(jsr_dest_bci));
4013 append(goto_sub);
4014 _block->set_end(goto_sub);
4015 _last = _block = jsr_start_block;
4016
4017 // Clear out bytecode stream
4018 scope_data()->set_stream(nullptr);
4019
4020 scope_data()->add_to_work_list(jsr_start_block);
4021
4022 // Ready to resume parsing in subroutine
4023 iterate_all_blocks();
4024
4025 // If we bailed out during parsing, return immediately (this is bad news)
4026 CHECK_BAILOUT_(false);
4027
4028 // Detect whether the continuation can actually be reached. If not,
4029 // it has not had state set by the join() operations in
4030 // iterate_bytecodes_for_block()/ret() and we should not touch the
4031 // iteration state. The calling activation of
4032 // iterate_bytecodes_for_block will then complete normally.
4033 if (cont->state() != nullptr) {
4034 if (!cont->is_set(BlockBegin::was_visited_flag)) {
4035 // add continuation to work list instead of parsing it immediately
4036 scope_data()->parent()->add_to_work_list(cont);
4037 }
4038 }
4039
4040 assert(jsr_continuation() == cont, "continuation must not have changed");
4041 assert(!jsr_continuation()->is_set(BlockBegin::was_visited_flag) ||
4042 jsr_continuation()->is_set(BlockBegin::parser_loop_header_flag),
4043 "continuation can only be visited in case of backward branches");
4044 assert(_last && _last->as_BlockEnd(), "block must have end");
4045
4046 // continuation is in work list, so end iteration of current block
4047 _skip_block = true;
4048 pop_scope_for_jsr();
4049
4050 return true;
4051 }
4052
4053
4054 // Inline the entry of a synchronized method as a monitor enter and
4055 // register the exception handler which releases the monitor if an
4056 // exception is thrown within the callee. Note that the monitor enter
4057 // cannot throw an exception itself, because the receiver is
4058 // guaranteed to be non-null by the explicit null check at the
4059 // beginning of inlining.
4060 void GraphBuilder::inline_sync_entry(Value lock, BlockBegin* sync_handler) {
4061 assert(lock != nullptr && sync_handler != nullptr, "lock or handler missing");
4062
4063 monitorenter(lock, SynchronizationEntryBCI);
4064 assert(_last->as_MonitorEnter() != nullptr, "monitor enter expected");
4065 _last->set_needs_null_check(false);
4066
4067 sync_handler->set(BlockBegin::exception_entry_flag);
4068 sync_handler->set(BlockBegin::is_on_work_list_flag);
4069
4070 ciExceptionHandler* desc = new ciExceptionHandler(method()->holder(), 0, method()->code_size(), -1, 0);
4071 XHandler* h = new XHandler(desc);
4072 h->set_entry_block(sync_handler);
4073 scope_data()->xhandlers()->append(h);
4074 scope_data()->set_has_handler();
4075 }
4076
4077
4078 // If an exception is thrown and not handled within an inlined
4079 // synchronized method, the monitor must be released before the
4080 // exception is rethrown in the outer scope. Generate the appropriate
4081 // instructions here.
4082 void GraphBuilder::fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler) {
4083 BlockBegin* orig_block = _block;
4084 ValueStack* orig_state = _state;
4085 Instruction* orig_last = _last;
4086 _last = _block = sync_handler;
4087 _state = sync_handler->state()->copy();
4088
4089 assert(sync_handler != nullptr, "handler missing");
4090 assert(!sync_handler->is_set(BlockBegin::was_visited_flag), "is visited here");
4091
4092 assert(lock != nullptr || default_handler, "lock or handler missing");
4093
4094 XHandler* h = scope_data()->xhandlers()->remove_last();
4095 assert(h->entry_block() == sync_handler, "corrupt list of handlers");
4096
4097 block()->set(BlockBegin::was_visited_flag);
4098 Value exception = append_with_bci(new ExceptionObject(), SynchronizationEntryBCI);
4099 assert(exception->is_pinned(), "must be");
4100
4101 int bci = SynchronizationEntryBCI;
4102 if (compilation()->env()->dtrace_method_probes()) {
4103 // Report exit from inline methods. We don't have a stream here
4104 // so pass an explicit bci of SynchronizationEntryBCI.
4105 Values* args = new Values(1);
4106 args->push(append_with_bci(new Constant(new MethodConstant(method())), bci));
4107 append_with_bci(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args), bci);
4108 }
4109
4110 if (lock) {
4111 assert(state()->locks_size() > 0 && state()->lock_at(state()->locks_size() - 1) == lock, "lock is missing");
4112 if (!lock->is_linked()) {
4113 lock = append_with_bci(lock, bci);
4114 }
4115
4116 // exit the monitor in the context of the synchronized method
4117 monitorexit(lock, bci);
4118
4119 // exit the context of the synchronized method
4120 if (!default_handler) {
4121 pop_scope();
4122 bci = _state->caller_state()->bci();
4123 _state = _state->caller_state()->copy_for_parsing();
4124 }
4125 }
4126
4127 // perform the throw as if at the call site
4128 apush(exception);
4129 throw_op(bci);
4130
4131 BlockEnd* end = last()->as_BlockEnd();
4132 block()->set_end(end);
4133
4134 _block = orig_block;
4135 _state = orig_state;
4136 _last = orig_last;
4137 }
4138
4139
4140 bool GraphBuilder::try_inline_full(ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc, Value receiver) {
4141 assert(!callee->is_native(), "callee must not be native");
4142 if (CompilationPolicy::should_not_inline(compilation()->env(), callee)) {
4143 INLINE_BAILOUT("inlining prohibited by policy");
4144 }
4145 // first perform tests of things it's not possible to inline
4146 if (callee->has_exception_handlers() &&
4147 !InlineMethodsWithExceptionHandlers) INLINE_BAILOUT("callee has exception handlers");
4148 if (callee->is_synchronized() &&
4149 !InlineSynchronizedMethods ) INLINE_BAILOUT("callee is synchronized");
4150 if (!callee->holder()->is_linked()) INLINE_BAILOUT("callee's klass not linked yet");
4151 if (bc == Bytecodes::_invokestatic &&
4152 !callee->holder()->is_initialized()) INLINE_BAILOUT("callee's klass not initialized yet");
4153 if (!callee->has_balanced_monitors()) INLINE_BAILOUT("callee's monitors do not match");
4154
4155 // Proper inlining of methods with jsrs requires a little more work.
4156 if (callee->has_jsrs() ) INLINE_BAILOUT("jsrs not handled properly by inliner yet");
4157
4158 if (is_profiling() && !callee->ensure_method_data()) {
4159 INLINE_BAILOUT("mdo allocation failed");
4160 }
4161
4162 const bool is_invokedynamic = (bc == Bytecodes::_invokedynamic);
4163 const bool has_receiver = (bc != Bytecodes::_invokestatic && !is_invokedynamic);
4164
4165 const int args_base = state()->stack_size() - callee->arg_size();
4166 assert(args_base >= 0, "stack underflow during inlining");
4167
4168 Value recv = nullptr;
4169 if (has_receiver) {
4170 assert(!callee->is_static(), "callee must not be static");
4171 assert(callee->arg_size() > 0, "must have at least a receiver");
4172
4173 recv = state()->stack_at(args_base);
4174 if (recv->is_null_obj()) {
4175 INLINE_BAILOUT("receiver is always null");
4176 }
4177 }
4178
4179 // now perform tests that are based on flag settings
4180 bool inlinee_by_directive = compilation()->directive()->should_inline(callee);
4181 if (callee->force_inline() || inlinee_by_directive) {
4182 if (inline_level() > MaxForceInlineLevel ) INLINE_BAILOUT("MaxForceInlineLevel");
4183 if (recursive_inline_level(callee) > C1MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep");
4184
4185 const char* msg = "";
4186 if (callee->force_inline()) msg = "force inline by annotation";
4187 if (inlinee_by_directive) msg = "force inline by CompileCommand";
4188 print_inlining(callee, msg);
4189 } else {
4190 // use heuristic controls on inlining
4191 if (inline_level() > C1MaxInlineLevel ) INLINE_BAILOUT("inlining too deep");
4192 int callee_recursive_level = recursive_inline_level(callee);
4193 if (callee_recursive_level > C1MaxRecursiveInlineLevel ) INLINE_BAILOUT("recursive inlining too deep");
4194 if (callee->code_size_for_inlining() > max_inline_size() ) INLINE_BAILOUT("callee is too large");
4195 // Additional condition to limit stack usage for non-recursive calls.
4196 if ((callee_recursive_level == 0) &&
4197 (callee->max_stack() + callee->max_locals() - callee->size_of_parameters() > C1InlineStackLimit)) {
4198 INLINE_BAILOUT("callee uses too much stack");
4199 }
4200
4201 // don't inline throwable methods unless the inlining tree is rooted in a throwable class
4202 if (callee->name() == ciSymbols::object_initializer_name() &&
4203 callee->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
4204 // Throwable constructor call
4205 IRScope* top = scope();
4206 while (top->caller() != nullptr) {
4207 top = top->caller();
4208 }
4209 if (!top->method()->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
4210 INLINE_BAILOUT("don't inline Throwable constructors");
4211 }
4212 }
4213
4214 if (compilation()->env()->num_inlined_bytecodes() > DesiredMethodLimit) {
4215 INLINE_BAILOUT("total inlining greater than DesiredMethodLimit");
4216 }
4217 // printing
4218 print_inlining(callee, "inline", /*success*/ true);
4219 }
4220
4221 assert(bc != Bytecodes::_invokestatic || callee->holder()->is_initialized(), "required");
4222
4223 // NOTE: Bailouts from this point on, which occur at the
4224 // GraphBuilder level, do not cause bailout just of the inlining but
4225 // in fact of the entire compilation.
4226
4227 BlockBegin* orig_block = block();
4228
4229 // Insert null check if necessary
4230 if (has_receiver) {
4231 // note: null check must happen even if first instruction of callee does
4232 // an implicit null check since the callee is in a different scope
4233 // and we must make sure exception handling does the right thing
4234 null_check(recv);
4235 }
4236
4237 if (is_profiling()) {
4238 // Note that we'd collect profile data in this method if we wanted it.
4239 // this may be redundant here...
4240 compilation()->set_would_profile(true);
4241
4242 if (profile_calls()) {
4243 int start = 0;
4244 Values* obj_args = args_list_for_profiling(callee, start, has_receiver);
4245 if (obj_args != nullptr) {
4246 int s = obj_args->capacity();
4247 // if called through method handle invoke, some arguments may have been popped
4248 for (int i = args_base+start, j = 0; j < obj_args->capacity() && i < state()->stack_size(); ) {
4249 Value v = state()->stack_at_inc(i);
4250 if (v->type()->is_object_kind()) {
4251 obj_args->push(v);
4252 j++;
4253 }
4254 }
4255 check_args_for_profiling(obj_args, s);
4256 }
4257 profile_call(callee, recv, holder_known ? callee->holder() : nullptr, obj_args, true);
4258 }
4259 }
4260
4261 // Introduce a new callee continuation point - if the callee has
4262 // more than one return instruction or the return does not allow
4263 // fall-through of control flow, all return instructions of the
4264 // callee will need to be replaced by Goto's pointing to this
4265 // continuation point.
4266 BlockBegin* cont = block_at(next_bci());
4267 bool continuation_existed = true;
4268 if (cont == nullptr) {
4269 cont = new BlockBegin(next_bci());
4270 // low number so that continuation gets parsed as early as possible
4271 cont->set_depth_first_number(0);
4272 if (PrintInitialBlockList) {
4273 tty->print_cr("CFG: created block %d (bci %d) as continuation for inline at bci %d",
4274 cont->block_id(), cont->bci(), bci());
4275 }
4276 continuation_existed = false;
4277 }
4278 // Record number of predecessors of continuation block before
4279 // inlining, to detect if inlined method has edges to its
4280 // continuation after inlining.
4281 int continuation_preds = cont->number_of_preds();
4282
4283 // Push callee scope
4284 push_scope(callee, cont);
4285
4286 // the BlockListBuilder for the callee could have bailed out
4287 if (bailed_out())
4288 return false;
4289
4290 // Temporarily set up bytecode stream so we can append instructions
4291 // (only using the bci of this stream)
4292 scope_data()->set_stream(scope_data()->parent()->stream());
4293
4294 // Pass parameters into callee state: add assignments
4295 // note: this will also ensure that all arguments are computed before being passed
4296 ValueStack* callee_state = state();
4297 ValueStack* caller_state = state()->caller_state();
4298 for (int i = args_base; i < caller_state->stack_size(); ) {
4299 const int arg_no = i - args_base;
4300 Value arg = caller_state->stack_at_inc(i);
4301 store_local(callee_state, arg, arg_no);
4302 }
4303
4304 // Remove args from stack.
4305 // Note that we preserve locals state in case we can use it later
4306 // (see use of pop_scope() below)
4307 caller_state->truncate_stack(args_base);
4308 assert(callee_state->stack_size() == 0, "callee stack must be empty");
4309
4310 Value lock = nullptr;
4311 BlockBegin* sync_handler = nullptr;
4312
4313 // Inline the locking of the receiver if the callee is synchronized
4314 if (callee->is_synchronized()) {
4315 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror())))
4316 : state()->local_at(0);
4317 sync_handler = new BlockBegin(SynchronizationEntryBCI);
4318 inline_sync_entry(lock, sync_handler);
4319 }
4320
4321 if (compilation()->env()->dtrace_method_probes()) {
4322 Values* args = new Values(1);
4323 args->push(append(new Constant(new MethodConstant(method()))));
4324 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args));
4325 }
4326
4327 if (profile_inlined_calls()) {
4328 profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI));
4329 }
4330
4331 BlockBegin* callee_start_block = block_at(0);
4332 if (callee_start_block != nullptr) {
4333 assert(callee_start_block->is_set(BlockBegin::parser_loop_header_flag), "must be loop header");
4334 Goto* goto_callee = new Goto(callee_start_block, false);
4335 // The state for this goto is in the scope of the callee, so use
4336 // the entry bci for the callee instead of the call site bci.
4337 append_with_bci(goto_callee, 0);
4338 _block->set_end(goto_callee);
4339 callee_start_block->merge(callee_state, compilation()->has_irreducible_loops());
4340
4341 _last = _block = callee_start_block;
4342
4343 scope_data()->add_to_work_list(callee_start_block);
4344 }
4345
4346 // Clear out bytecode stream
4347 scope_data()->set_stream(nullptr);
4348 scope_data()->set_ignore_return(ignore_return);
4349
4350 CompileLog* log = compilation()->log();
4351 if (log != nullptr) log->head("parse method='%d'", log->identify(callee));
4352
4353 // Ready to resume parsing in callee (either in the same block we
4354 // were in before or in the callee's start block)
4355 iterate_all_blocks(callee_start_block == nullptr);
4356
4357 if (log != nullptr) log->done("parse");
4358
4359 // If we bailed out during parsing, return immediately (this is bad news)
4360 if (bailed_out())
4361 return false;
4362
4363 // iterate_all_blocks theoretically traverses in random order; in
4364 // practice, we have only traversed the continuation if we are
4365 // inlining into a subroutine
4366 assert(continuation_existed ||
4367 !continuation()->is_set(BlockBegin::was_visited_flag),
4368 "continuation should not have been parsed yet if we created it");
4369
4370 // At this point we are almost ready to return and resume parsing of
4371 // the caller back in the GraphBuilder. The only thing we want to do
4372 // first is an optimization: during parsing of the callee we
4373 // generated at least one Goto to the continuation block. If we
4374 // generated exactly one, and if the inlined method spanned exactly
4375 // one block (and we didn't have to Goto its entry), then we snip
4376 // off the Goto to the continuation, allowing control to fall
4377 // through back into the caller block and effectively performing
4378 // block merging. This allows load elimination and CSE to take place
4379 // across multiple callee scopes if they are relatively simple, and
4380 // is currently essential to making inlining profitable.
4381 if (num_returns() == 1
4382 && block() == orig_block
4383 && block() == inline_cleanup_block()) {
4384 _last = inline_cleanup_return_prev();
4385 _state = inline_cleanup_state();
4386 } else if (continuation_preds == cont->number_of_preds()) {
4387 // Inlining caused that the instructions after the invoke in the
4388 // caller are not reachable any more. So skip filling this block
4389 // with instructions!
4390 assert(cont == continuation(), "");
4391 assert(_last && _last->as_BlockEnd(), "");
4392 _skip_block = true;
4393 } else {
4394 // Resume parsing in continuation block unless it was already parsed.
4395 // Note that if we don't change _last here, iteration in
4396 // iterate_bytecodes_for_block will stop when we return.
4397 if (!continuation()->is_set(BlockBegin::was_visited_flag)) {
4398 // add continuation to work list instead of parsing it immediately
4399 assert(_last && _last->as_BlockEnd(), "");
4400 scope_data()->parent()->add_to_work_list(continuation());
4401 _skip_block = true;
4402 }
4403 }
4404
4405 // Fill the exception handler for synchronized methods with instructions
4406 if (callee->is_synchronized() && sync_handler->state() != nullptr) {
4407 fill_sync_handler(lock, sync_handler);
4408 } else {
4409 pop_scope();
4410 }
4411
4412 compilation()->notice_inlined_method(callee);
4413
4414 return true;
4415 }
4416
4417
4418 bool GraphBuilder::try_method_handle_inline(ciMethod* callee, bool ignore_return) {
4419 ValueStack* state_before = copy_state_before();
4420 vmIntrinsics::ID iid = callee->intrinsic_id();
4421 switch (iid) {
4422 case vmIntrinsics::_invokeBasic:
4423 {
4424 // get MethodHandle receiver
4425 const int args_base = state()->stack_size() - callee->arg_size();
4426 ValueType* type = state()->stack_at(args_base)->type();
4427 if (type->is_constant()) {
4428 ciObject* mh = type->as_ObjectType()->constant_value();
4429 if (mh->is_method_handle()) {
4430 ciMethod* target = mh->as_method_handle()->get_vmtarget();
4431
4432 // We don't do CHA here so only inline static and statically bindable methods.
4433 if (target->is_static() || target->can_be_statically_bound()) {
4434 if (ciMethod::is_consistent_info(callee, target)) {
4435 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual;
4436 ignore_return = ignore_return || (callee->return_type()->is_void() && !target->return_type()->is_void());
4437 if (try_inline(target, /*holder_known*/ !callee->is_static(), ignore_return, bc)) {
4438 return true;
4439 }
4440 } else {
4441 print_inlining(target, "signatures mismatch", /*success*/ false);
4442 }
4443 } else {
4444 assert(false, "no inlining through MH::invokeBasic"); // missing optimization opportunity due to suboptimal LF shape
4445 print_inlining(target, "not static or statically bindable", /*success*/ false);
4446 }
4447 } else {
4448 assert(mh->is_null_object(), "not a null");
4449 print_inlining(callee, "receiver is always null", /*success*/ false);
4450 }
4451 } else {
4452 print_inlining(callee, "receiver not constant", /*success*/ false);
4453 }
4454 }
4455 break;
4456
4457 case vmIntrinsics::_linkToVirtual:
4458 case vmIntrinsics::_linkToStatic:
4459 case vmIntrinsics::_linkToSpecial:
4460 case vmIntrinsics::_linkToInterface:
4461 {
4462 // pop MemberName argument
4463 const int args_base = state()->stack_size() - callee->arg_size();
4464 ValueType* type = apop()->type();
4465 if (type->is_constant()) {
4466 ciMethod* target = type->as_ObjectType()->constant_value()->as_member_name()->get_vmtarget();
4467 ignore_return = ignore_return || (callee->return_type()->is_void() && !target->return_type()->is_void());
4468 // If the target is another method handle invoke, try to recursively get
4469 // a better target.
4470 if (target->is_method_handle_intrinsic()) {
4471 if (try_method_handle_inline(target, ignore_return)) {
4472 return true;
4473 }
4474 } else if (!ciMethod::is_consistent_info(callee, target)) {
4475 print_inlining(target, "signatures mismatch", /*success*/ false);
4476 } else {
4477 ciSignature* signature = target->signature();
4478 const int receiver_skip = target->is_static() ? 0 : 1;
4479 // Cast receiver to its type.
4480 if (!target->is_static()) {
4481 ciKlass* tk = signature->accessing_klass();
4482 Value obj = state()->stack_at(args_base);
4483 if (obj->exact_type() == nullptr &&
4484 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) {
4485 TypeCast* c = new TypeCast(tk, obj, state_before);
4486 append(c);
4487 state()->stack_at_put(args_base, c);
4488 }
4489 }
4490 // Cast reference arguments to its type.
4491 for (int i = 0, j = 0; i < signature->count(); i++) {
4492 ciType* t = signature->type_at(i);
4493 if (t->is_klass()) {
4494 ciKlass* tk = t->as_klass();
4495 Value obj = state()->stack_at(args_base + receiver_skip + j);
4496 if (obj->exact_type() == nullptr &&
4497 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) {
4498 TypeCast* c = new TypeCast(t, obj, state_before);
4499 append(c);
4500 state()->stack_at_put(args_base + receiver_skip + j, c);
4501 }
4502 }
4503 j += t->size(); // long and double take two slots
4504 }
4505 // We don't do CHA here so only inline static and statically bindable methods.
4506 if (target->is_static() || target->can_be_statically_bound()) {
4507 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual;
4508 if (try_inline(target, /*holder_known*/ !callee->is_static(), ignore_return, bc)) {
4509 return true;
4510 }
4511 } else {
4512 print_inlining(target, "not static or statically bindable", /*success*/ false);
4513 }
4514 }
4515 } else {
4516 print_inlining(callee, "MemberName not constant", /*success*/ false);
4517 }
4518 }
4519 break;
4520
4521 case vmIntrinsics::_linkToNative:
4522 print_inlining(callee, "native call", /*success*/ false);
4523 break;
4524
4525 default:
4526 fatal("unexpected intrinsic %d: %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
4527 break;
4528 }
4529 set_state(state_before->copy_for_parsing());
4530 return false;
4531 }
4532
4533
4534 void GraphBuilder::inline_bailout(const char* msg) {
4535 assert(msg != nullptr, "inline bailout msg must exist");
4536 _inline_bailout_msg = msg;
4537 }
4538
4539
4540 void GraphBuilder::clear_inline_bailout() {
4541 _inline_bailout_msg = nullptr;
4542 }
4543
4544
4545 void GraphBuilder::push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start) {
4546 ScopeData* data = new ScopeData(nullptr);
4547 data->set_scope(scope);
4548 data->set_bci2block(bci2block);
4549 _scope_data = data;
4550 _block = start;
4551 }
4552
4553
4554 void GraphBuilder::push_scope(ciMethod* callee, BlockBegin* continuation) {
4555 IRScope* callee_scope = new IRScope(compilation(), scope(), bci(), callee, -1, false);
4556 scope()->add_callee(callee_scope);
4557
4558 BlockListBuilder blb(compilation(), callee_scope, -1);
4559 CHECK_BAILOUT();
4560
4561 if (!blb.bci2block()->at(0)->is_set(BlockBegin::parser_loop_header_flag)) {
4562 // this scope can be inlined directly into the caller so remove
4563 // the block at bci 0.
4564 blb.bci2block()->at_put(0, nullptr);
4565 }
4566
4567 set_state(new ValueStack(callee_scope, state()->copy(ValueStack::CallerState, bci())));
4568
4569 ScopeData* data = new ScopeData(scope_data());
4570 data->set_scope(callee_scope);
4571 data->set_bci2block(blb.bci2block());
4572 data->set_continuation(continuation);
4573 _scope_data = data;
4574 }
4575
4576
4577 void GraphBuilder::push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci) {
4578 ScopeData* data = new ScopeData(scope_data());
4579 data->set_parsing_jsr();
4580 data->set_jsr_entry_bci(jsr_dest_bci);
4581 data->set_jsr_return_address_local(-1);
4582 // Must clone bci2block list as we will be mutating it in order to
4583 // properly clone all blocks in jsr region as well as exception
4584 // handlers containing rets
4585 BlockList* new_bci2block = new BlockList(bci2block()->length());
4586 new_bci2block->appendAll(bci2block());
4587 data->set_bci2block(new_bci2block);
4588 data->set_scope(scope());
4589 data->setup_jsr_xhandlers();
4590 data->set_continuation(continuation());
4591 data->set_jsr_continuation(jsr_continuation);
4592 _scope_data = data;
4593 }
4594
4595
4596 void GraphBuilder::pop_scope() {
4597 int number_of_locks = scope()->number_of_locks();
4598 _scope_data = scope_data()->parent();
4599 // accumulate minimum number of monitor slots to be reserved
4600 scope()->set_min_number_of_locks(number_of_locks);
4601 }
4602
4603
4604 void GraphBuilder::pop_scope_for_jsr() {
4605 _scope_data = scope_data()->parent();
4606 }
4607
4608 void GraphBuilder::append_unsafe_get(ciMethod* callee, BasicType t, bool is_volatile) {
4609 Values* args = state()->pop_arguments(callee->arg_size());
4610 null_check(args->at(0));
4611 Instruction* offset = args->at(2);
4612 #ifndef _LP64
4613 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4614 #endif
4615 Instruction* op = append(new UnsafeGet(t, args->at(1), offset, is_volatile));
4616 push(op->type(), op);
4617 compilation()->set_has_unsafe_access(true);
4618 }
4619
4620
4621 void GraphBuilder::append_unsafe_put(ciMethod* callee, BasicType t, bool is_volatile) {
4622 Values* args = state()->pop_arguments(callee->arg_size());
4623 null_check(args->at(0));
4624 Instruction* offset = args->at(2);
4625 #ifndef _LP64
4626 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4627 #endif
4628 Value val = args->at(3);
4629 if (t == T_BOOLEAN) {
4630 Value mask = append(new Constant(new IntConstant(1)));
4631 val = append(new LogicOp(Bytecodes::_iand, val, mask));
4632 }
4633 Instruction* op = append(new UnsafePut(t, args->at(1), offset, val, is_volatile));
4634 compilation()->set_has_unsafe_access(true);
4635 kill_all();
4636 }
4637
4638 void GraphBuilder::append_unsafe_CAS(ciMethod* callee) {
4639 ValueStack* state_before = copy_state_for_exception();
4640 ValueType* result_type = as_ValueType(callee->return_type());
4641 assert(result_type->is_int(), "int result");
4642 Values* args = state()->pop_arguments(callee->arg_size());
4643
4644 // Pop off some args to specially handle, then push back
4645 Value newval = args->pop();
4646 Value cmpval = args->pop();
4647 Value offset = args->pop();
4648 Value src = args->pop();
4649 Value unsafe_obj = args->pop();
4650
4651 // Separately handle the unsafe arg. It is not needed for code
4652 // generation, but must be null checked
4653 null_check(unsafe_obj);
4654
4655 #ifndef _LP64
4656 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4657 #endif
4658
4659 args->push(src);
4660 args->push(offset);
4661 args->push(cmpval);
4662 args->push(newval);
4663
4664 // An unsafe CAS can alias with other field accesses, but we don't
4665 // know which ones so mark the state as no preserved. This will
4666 // cause CSE to invalidate memory across it.
4667 bool preserves_state = false;
4668 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), args, false, state_before, preserves_state);
4669 append_split(result);
4670 push(result_type, result);
4671 compilation()->set_has_unsafe_access(true);
4672 }
4673
4674 void GraphBuilder::append_char_access(ciMethod* callee, bool is_store) {
4675 // This intrinsic accesses byte[] array as char[] array. Computing the offsets
4676 // correctly requires matched array shapes.
4677 assert (arrayOopDesc::base_offset_in_bytes(T_CHAR) == arrayOopDesc::base_offset_in_bytes(T_BYTE),
4678 "sanity: byte[] and char[] bases agree");
4679 assert (type2aelembytes(T_CHAR) == type2aelembytes(T_BYTE)*2,
4680 "sanity: byte[] and char[] scales agree");
4681
4682 ValueStack* state_before = copy_state_indexed_access();
4683 compilation()->set_has_access_indexed(true);
4684 Values* args = state()->pop_arguments(callee->arg_size());
4685 Value array = args->at(0);
4686 Value index = args->at(1);
4687 if (is_store) {
4688 Value value = args->at(2);
4689 Instruction* store = append(new StoreIndexed(array, index, nullptr, T_CHAR, value, state_before, false, true));
4690 store->set_flag(Instruction::NeedsRangeCheckFlag, false);
4691 _memory->store_value(value);
4692 } else {
4693 Instruction* load = append(new LoadIndexed(array, index, nullptr, T_CHAR, state_before, true));
4694 load->set_flag(Instruction::NeedsRangeCheckFlag, false);
4695 push(load->type(), load);
4696 }
4697 }
4698
4699 void GraphBuilder::print_inlining(ciMethod* callee, const char* msg, bool success) {
4700 CompileLog* log = compilation()->log();
4701 if (log != nullptr) {
4702 assert(msg != nullptr, "inlining msg should not be null!");
4703 if (success) {
4704 log->inline_success(msg);
4705 } else {
4706 log->inline_fail(msg);
4707 }
4708 }
4709 EventCompilerInlining event;
4710 if (event.should_commit()) {
4711 CompilerEvent::InlineEvent::post(event, compilation()->env()->task()->compile_id(), method()->get_Method(), callee, success, msg, bci());
4712 }
4713
4714 CompileTask::print_inlining_ul(callee, scope()->level(), bci(), inlining_result_of(success), msg);
4715
4716 if (!compilation()->directive()->PrintInliningOption) {
4717 return;
4718 }
4719 CompileTask::print_inlining_tty(callee, scope()->level(), bci(), inlining_result_of(success), msg);
4720 if (success && CIPrintMethodCodes) {
4721 callee->print_codes();
4722 }
4723 }
4724
4725 void GraphBuilder::append_unsafe_get_and_set(ciMethod* callee, bool is_add) {
4726 Values* args = state()->pop_arguments(callee->arg_size());
4727 BasicType t = callee->return_type()->basic_type();
4728 null_check(args->at(0));
4729 Instruction* offset = args->at(2);
4730 #ifndef _LP64
4731 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4732 #endif
4733 Instruction* op = append(new UnsafeGetAndSet(t, args->at(1), offset, args->at(3), is_add));
4734 compilation()->set_has_unsafe_access(true);
4735 kill_all();
4736 push(op->type(), op);
4737 }
4738
4739 #ifndef PRODUCT
4740 void GraphBuilder::print_stats() {
4741 vmap()->print();
4742 }
4743 #endif // PRODUCT
4744
4745 void GraphBuilder::profile_call(ciMethod* callee, Value recv, ciKlass* known_holder, Values* obj_args, bool inlined) {
4746 assert(known_holder == nullptr || (known_holder->is_instance_klass() &&
4747 (!known_holder->is_interface() ||
4748 ((ciInstanceKlass*)known_holder)->has_nonstatic_concrete_methods())), "should be non-static concrete method");
4749 if (known_holder != nullptr) {
4750 if (known_holder->exact_klass() == nullptr) {
4751 known_holder = compilation()->cha_exact_type(known_holder);
4752 }
4753 }
4754
4755 append(new ProfileCall(method(), bci(), callee, recv, known_holder, obj_args, inlined));
4756 }
4757
4758 void GraphBuilder::profile_return_type(Value ret, ciMethod* callee, ciMethod* m, int invoke_bci) {
4759 assert((m == nullptr) == (invoke_bci < 0), "invalid method and invalid bci together");
4760 if (m == nullptr) {
4761 m = method();
4762 }
4763 if (invoke_bci < 0) {
4764 invoke_bci = bci();
4765 }
4766 ciMethodData* md = m->method_data_or_null();
4767 ciProfileData* data = md->bci_to_data(invoke_bci);
4768 if (data != nullptr && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) {
4769 bool has_return = data->is_CallTypeData() ? ((ciCallTypeData*)data)->has_return() : ((ciVirtualCallTypeData*)data)->has_return();
4770 if (has_return) {
4771 append(new ProfileReturnType(m , invoke_bci, callee, ret));
4772 }
4773 }
4774 }
4775
4776 void GraphBuilder::profile_invocation(ciMethod* callee, ValueStack* state) {
4777 append(new ProfileInvoke(callee, state));
4778 }