1 /*
2 * Copyright (c) 1999, 2024, 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 static 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(), state_before);
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 if (has_pending_field_access()) {
2050 state_before = pending_field_access()->state_before();
2051 }
2052 NewInstance* new_instance = new NewInstance(inline_klass, state_before, false, true);
2053 _memory->new_instance(new_instance);
2054 apush(append_split(new_instance));
2055 assert(!needs_patching, "Can't patch flat inline type field access");
2056 if (has_pending_field_access()) {
2057 copy_inline_content(inline_klass, pending_field_access()->obj(),
2058 pending_field_access()->offset() + field->offset_in_bytes() - field->holder()->as_inline_klass()->first_field_offset(),
2059 new_instance, inline_klass->first_field_offset(), state_before);
2060 set_pending_field_access(nullptr);
2061 } else {
2062 copy_inline_content(inline_klass, obj, field->offset_in_bytes(), new_instance, inline_klass->first_field_offset(), state_before);
2063 }
2064 need_membar = true;
2065 }
2066 if (need_membar) {
2067 // If we allocated a new instance ensure the stores to copy the
2068 // field contents are visible before any subsequent store that
2069 // publishes this reference.
2070 append(new MemBar(lir_membar_storestore));
2071 }
2072 }
2073 }
2074 }
2075 break;
2076 }
2077 case Bytecodes::_putfield: {
2078 Value val = pop(type);
2079 obj = apop();
2080 if (state_before == nullptr) {
2081 state_before = copy_state_for_exception();
2082 }
2083 if (field_type == T_BOOLEAN) {
2084 Value mask = append(new Constant(new IntConstant(1)));
2085 val = append(new LogicOp(Bytecodes::_iand, val, mask));
2086 }
2087 if (field->is_null_free() && field->type()->is_loaded() && field->type()->as_inline_klass()->is_empty()) {
2088 // Storing to a field of an empty inline type. Ignore.
2089 null_check(obj);
2090 null_check(val);
2091 } else if (!field->is_flat()) {
2092 if (field->is_null_free()) {
2093 null_check(val);
2094 }
2095 StoreField* store = new StoreField(obj, offset, field, val, false, state_before, needs_patching);
2096 if (!needs_patching) store = _memory->store(store);
2097 if (store != nullptr) {
2098 append(store);
2099 }
2100 } else {
2101 assert(!needs_patching, "Can't patch flat inline type field access");
2102 ciInlineKlass* inline_klass = field->type()->as_inline_klass();
2103 copy_inline_content(inline_klass, val, inline_klass->first_field_offset(), obj, offset, state_before, field);
2104 }
2105 break;
2106 }
2107 default:
2108 ShouldNotReachHere();
2109 break;
2110 }
2111 }
2112
2113 Dependencies* GraphBuilder::dependency_recorder() const {
2114 assert(DeoptC1, "need debug information");
2115 return compilation()->dependency_recorder();
2116 }
2117
2118 // How many arguments do we want to profile?
2119 Values* GraphBuilder::args_list_for_profiling(ciMethod* target, int& start, bool may_have_receiver) {
2120 int n = 0;
2121 bool has_receiver = may_have_receiver && Bytecodes::has_receiver(method()->java_code_at_bci(bci()));
2122 start = has_receiver ? 1 : 0;
2123 if (profile_arguments()) {
2124 ciProfileData* data = method()->method_data()->bci_to_data(bci());
2125 if (data != nullptr && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) {
2126 n = data->is_CallTypeData() ? data->as_CallTypeData()->number_of_arguments() : data->as_VirtualCallTypeData()->number_of_arguments();
2127 }
2128 }
2129 // If we are inlining then we need to collect arguments to profile parameters for the target
2130 if (profile_parameters() && target != nullptr) {
2131 if (target->method_data() != nullptr && target->method_data()->parameters_type_data() != nullptr) {
2132 // The receiver is profiled on method entry so it's included in
2133 // the number of parameters but here we're only interested in
2134 // actual arguments.
2135 n = MAX2(n, target->method_data()->parameters_type_data()->number_of_parameters() - start);
2136 }
2137 }
2138 if (n > 0) {
2139 return new Values(n);
2140 }
2141 return nullptr;
2142 }
2143
2144 void GraphBuilder::check_args_for_profiling(Values* obj_args, int expected) {
2145 #ifdef ASSERT
2146 bool ignored_will_link;
2147 ciSignature* declared_signature = nullptr;
2148 ciMethod* real_target = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature);
2149 assert(expected == obj_args->capacity() || real_target->is_method_handle_intrinsic(), "missed on arg?");
2150 #endif
2151 }
2152
2153 // Collect arguments that we want to profile in a list
2154 Values* GraphBuilder::collect_args_for_profiling(Values* args, ciMethod* target, bool may_have_receiver) {
2155 int start = 0;
2156 Values* obj_args = args_list_for_profiling(target, start, may_have_receiver);
2157 if (obj_args == nullptr) {
2158 return nullptr;
2159 }
2160 int s = obj_args->capacity();
2161 // if called through method handle invoke, some arguments may have been popped
2162 for (int i = start, j = 0; j < s && i < args->length(); i++) {
2163 if (args->at(i)->type()->is_object_kind()) {
2164 obj_args->push(args->at(i));
2165 j++;
2166 }
2167 }
2168 check_args_for_profiling(obj_args, s);
2169 return obj_args;
2170 }
2171
2172 void GraphBuilder::invoke(Bytecodes::Code code) {
2173 bool will_link;
2174 ciSignature* declared_signature = nullptr;
2175 ciMethod* target = stream()->get_method(will_link, &declared_signature);
2176 ciKlass* holder = stream()->get_declared_method_holder();
2177 const Bytecodes::Code bc_raw = stream()->cur_bc_raw();
2178 assert(declared_signature != nullptr, "cannot be null");
2179 assert(will_link == target->is_loaded(), "");
2180 JFR_ONLY(Jfr::on_resolution(this, holder, target); CHECK_BAILOUT();)
2181
2182 ciInstanceKlass* klass = target->holder();
2183 assert(!target->is_loaded() || klass->is_loaded(), "loaded target must imply loaded klass");
2184
2185 // check if CHA possible: if so, change the code to invoke_special
2186 ciInstanceKlass* calling_klass = method()->holder();
2187 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder);
2188 ciInstanceKlass* actual_recv = callee_holder;
2189
2190 CompileLog* log = compilation()->log();
2191 if (log != nullptr)
2192 log->elem("call method='%d' instr='%s'",
2193 log->identify(target),
2194 Bytecodes::name(code));
2195
2196 // Some methods are obviously bindable without any type checks so
2197 // convert them directly to an invokespecial or invokestatic.
2198 if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) {
2199 switch (bc_raw) {
2200 case Bytecodes::_invokeinterface:
2201 // convert to invokespecial if the target is the private interface method.
2202 if (target->is_private()) {
2203 assert(holder->is_interface(), "How did we get a non-interface method here!");
2204 code = Bytecodes::_invokespecial;
2205 }
2206 break;
2207 case Bytecodes::_invokevirtual:
2208 code = Bytecodes::_invokespecial;
2209 break;
2210 case Bytecodes::_invokehandle:
2211 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial;
2212 break;
2213 default:
2214 break;
2215 }
2216 } else {
2217 if (bc_raw == Bytecodes::_invokehandle) {
2218 assert(!will_link, "should come here only for unlinked call");
2219 code = Bytecodes::_invokespecial;
2220 }
2221 }
2222
2223 if (code == Bytecodes::_invokespecial) {
2224 // Additional receiver subtype checks for interface calls via invokespecial or invokeinterface.
2225 ciKlass* receiver_constraint = nullptr;
2226
2227 if (bc_raw == Bytecodes::_invokeinterface) {
2228 receiver_constraint = holder;
2229 } else if (bc_raw == Bytecodes::_invokespecial && !target->is_object_constructor() && calling_klass->is_interface()) {
2230 receiver_constraint = calling_klass;
2231 }
2232
2233 if (receiver_constraint != nullptr) {
2234 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
2235 Value receiver = state()->stack_at(index);
2236 CheckCast* c = new CheckCast(receiver_constraint, receiver, copy_state_before());
2237 // go to uncommon_trap when checkcast fails
2238 c->set_invokespecial_receiver_check();
2239 state()->stack_at_put(index, append_split(c));
2240 }
2241 }
2242
2243 // Push appendix argument (MethodType, CallSite, etc.), if one.
2244 bool patch_for_appendix = false;
2245 int patching_appendix_arg = 0;
2246 if (Bytecodes::has_optional_appendix(bc_raw) && (!will_link || PatchALot)) {
2247 Value arg = append(new Constant(new ObjectConstant(compilation()->env()->unloaded_ciinstance()), copy_state_before()));
2248 apush(arg);
2249 patch_for_appendix = true;
2250 patching_appendix_arg = (will_link && stream()->has_appendix()) ? 0 : 1;
2251 } else if (stream()->has_appendix()) {
2252 ciObject* appendix = stream()->get_appendix();
2253 Value arg = append(new Constant(new ObjectConstant(appendix)));
2254 apush(arg);
2255 }
2256
2257 ciMethod* cha_monomorphic_target = nullptr;
2258 ciMethod* exact_target = nullptr;
2259 Value better_receiver = nullptr;
2260 if (UseCHA && DeoptC1 && target->is_loaded() &&
2261 !(// %%% FIXME: Are both of these relevant?
2262 target->is_method_handle_intrinsic() ||
2263 target->is_compiled_lambda_form()) &&
2264 !patch_for_appendix) {
2265 Value receiver = nullptr;
2266 ciInstanceKlass* receiver_klass = nullptr;
2267 bool type_is_exact = false;
2268 // try to find a precise receiver type
2269 if (will_link && !target->is_static()) {
2270 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
2271 receiver = state()->stack_at(index);
2272 ciType* type = receiver->exact_type();
2273 if (type != nullptr && type->is_loaded() &&
2274 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
2275 receiver_klass = (ciInstanceKlass*) type;
2276 type_is_exact = true;
2277 }
2278 if (type == nullptr) {
2279 type = receiver->declared_type();
2280 if (type != nullptr && type->is_loaded() &&
2281 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
2282 receiver_klass = (ciInstanceKlass*) type;
2283 if (receiver_klass->is_leaf_type() && !receiver_klass->is_final()) {
2284 // Insert a dependency on this type since
2285 // find_monomorphic_target may assume it's already done.
2286 dependency_recorder()->assert_leaf_type(receiver_klass);
2287 type_is_exact = true;
2288 }
2289 }
2290 }
2291 }
2292 if (receiver_klass != nullptr && type_is_exact &&
2293 receiver_klass->is_loaded() && code != Bytecodes::_invokespecial) {
2294 // If we have the exact receiver type we can bind directly to
2295 // the method to call.
2296 exact_target = target->resolve_invoke(calling_klass, receiver_klass);
2297 if (exact_target != nullptr) {
2298 target = exact_target;
2299 code = Bytecodes::_invokespecial;
2300 }
2301 }
2302 if (receiver_klass != nullptr &&
2303 receiver_klass->is_subtype_of(actual_recv) &&
2304 actual_recv->is_initialized()) {
2305 actual_recv = receiver_klass;
2306 }
2307
2308 if ((code == Bytecodes::_invokevirtual && callee_holder->is_initialized()) ||
2309 (code == Bytecodes::_invokeinterface && callee_holder->is_initialized() && !actual_recv->is_interface())) {
2310 // Use CHA on the receiver to select a more precise method.
2311 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv);
2312 } else if (code == Bytecodes::_invokeinterface && callee_holder->is_loaded() && receiver != nullptr) {
2313 assert(callee_holder->is_interface(), "invokeinterface to non interface?");
2314 // If there is only one implementor of this interface then we
2315 // may be able bind this invoke directly to the implementing
2316 // klass but we need both a dependence on the single interface
2317 // and on the method we bind to. Additionally since all we know
2318 // about the receiver type is the it's supposed to implement the
2319 // interface we have to insert a check that it's the class we
2320 // expect. Interface types are not checked by the verifier so
2321 // they are roughly equivalent to Object.
2322 // The number of implementors for declared_interface is less or
2323 // equal to the number of implementors for target->holder() so
2324 // if number of implementors of target->holder() == 1 then
2325 // number of implementors for decl_interface is 0 or 1. If
2326 // it's 0 then no class implements decl_interface and there's
2327 // no point in inlining.
2328 ciInstanceKlass* declared_interface = callee_holder;
2329 ciInstanceKlass* singleton = declared_interface->unique_implementor();
2330 if (singleton != nullptr) {
2331 assert(singleton != declared_interface, "not a unique implementor");
2332 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, declared_interface, singleton);
2333 if (cha_monomorphic_target != nullptr) {
2334 ciInstanceKlass* holder = cha_monomorphic_target->holder();
2335 ciInstanceKlass* constraint = (holder->is_subtype_of(singleton) ? holder : singleton); // avoid upcasts
2336 if (holder != compilation()->env()->Object_klass() &&
2337 (!type_is_exact || receiver_klass->is_subtype_of(constraint))) {
2338 actual_recv = declared_interface;
2339
2340 // insert a check it's really the expected class.
2341 CheckCast* c = new CheckCast(constraint, receiver, copy_state_for_exception());
2342 c->set_incompatible_class_change_check();
2343 c->set_direct_compare(constraint->is_final());
2344 // pass the result of the checkcast so that the compiler has
2345 // more accurate type info in the inlinee
2346 better_receiver = append_split(c);
2347
2348 dependency_recorder()->assert_unique_implementor(declared_interface, singleton);
2349 } else {
2350 cha_monomorphic_target = nullptr;
2351 }
2352 }
2353 }
2354 }
2355 }
2356
2357 if (cha_monomorphic_target != nullptr) {
2358 assert(!target->can_be_statically_bound() || target == cha_monomorphic_target, "");
2359 assert(!cha_monomorphic_target->is_abstract(), "");
2360 if (!cha_monomorphic_target->can_be_statically_bound(actual_recv)) {
2361 // If we inlined because CHA revealed only a single target method,
2362 // then we are dependent on that target method not getting overridden
2363 // by dynamic class loading. Be sure to test the "static" receiver
2364 // dest_method here, as opposed to the actual receiver, which may
2365 // falsely lead us to believe that the receiver is final or private.
2366 dependency_recorder()->assert_unique_concrete_method(actual_recv, cha_monomorphic_target, callee_holder, target);
2367 }
2368 code = Bytecodes::_invokespecial;
2369 }
2370
2371 // check if we could do inlining
2372 if (!PatchALot && Inline && target->is_loaded() && !patch_for_appendix &&
2373 callee_holder->is_loaded()) { // the effect of symbolic reference resolution
2374
2375 // callee is known => check if we have static binding
2376 if ((code == Bytecodes::_invokestatic && klass->is_initialized()) || // invokestatic involves an initialization barrier on declaring class
2377 code == Bytecodes::_invokespecial ||
2378 (code == Bytecodes::_invokevirtual && target->is_final_method()) ||
2379 code == Bytecodes::_invokedynamic) {
2380 // static binding => check if callee is ok
2381 ciMethod* inline_target = (cha_monomorphic_target != nullptr) ? cha_monomorphic_target : target;
2382 bool holder_known = (cha_monomorphic_target != nullptr) || (exact_target != nullptr);
2383 bool success = try_inline(inline_target, holder_known, false /* ignore_return */, code, better_receiver);
2384
2385 CHECK_BAILOUT();
2386 clear_inline_bailout();
2387
2388 if (success) {
2389 // Register dependence if JVMTI has either breakpoint
2390 // setting or hotswapping of methods capabilities since they may
2391 // cause deoptimization.
2392 if (compilation()->env()->jvmti_can_hotswap_or_post_breakpoint()) {
2393 dependency_recorder()->assert_evol_method(inline_target);
2394 }
2395 return;
2396 }
2397 } else {
2398 print_inlining(target, "no static binding", /*success*/ false);
2399 }
2400 } else {
2401 print_inlining(target, "not inlineable", /*success*/ false);
2402 }
2403
2404 // If we attempted an inline which did not succeed because of a
2405 // bailout during construction of the callee graph, the entire
2406 // compilation has to be aborted. This is fairly rare and currently
2407 // seems to only occur for jasm-generated classes which contain
2408 // jsr/ret pairs which are not associated with finally clauses and
2409 // do not have exception handlers in the containing method, and are
2410 // therefore not caught early enough to abort the inlining without
2411 // corrupting the graph. (We currently bail out with a non-empty
2412 // stack at a ret in these situations.)
2413 CHECK_BAILOUT();
2414
2415 // inlining not successful => standard invoke
2416 ValueType* result_type = as_ValueType(declared_signature->return_type());
2417 ValueStack* state_before = copy_state_exhandling();
2418
2419 // The bytecode (code) might change in this method so we are checking this very late.
2420 const bool has_receiver =
2421 code == Bytecodes::_invokespecial ||
2422 code == Bytecodes::_invokevirtual ||
2423 code == Bytecodes::_invokeinterface;
2424 Values* args = state()->pop_arguments(target->arg_size_no_receiver() + patching_appendix_arg);
2425 Value recv = has_receiver ? apop() : nullptr;
2426
2427 // A null check is required here (when there is a receiver) for any of the following cases
2428 // - invokespecial, always need a null check.
2429 // - invokevirtual, when the target is final and loaded. Calls to final targets will become optimized
2430 // and require null checking. If the target is loaded a null check is emitted here.
2431 // If the target isn't loaded the null check must happen after the call resolution. We achieve that
2432 // by using the target methods unverified entry point (see CompiledIC::compute_monomorphic_entry).
2433 // (The JVM specification requires that LinkageError must be thrown before a NPE. An unloaded target may
2434 // potentially fail, and can't have the null check before the resolution.)
2435 // - A call that will be profiled. (But we can't add a null check when the target is unloaded, by the same
2436 // reason as above, so calls with a receiver to unloaded targets can't be profiled.)
2437 //
2438 // Normal invokevirtual will perform the null check during lookup
2439
2440 bool need_null_check = (code == Bytecodes::_invokespecial) ||
2441 (target->is_loaded() && (target->is_final_method() || (is_profiling() && profile_calls())));
2442
2443 if (need_null_check) {
2444 if (recv != nullptr) {
2445 null_check(recv);
2446 }
2447
2448 if (is_profiling()) {
2449 // Note that we'd collect profile data in this method if we wanted it.
2450 compilation()->set_would_profile(true);
2451
2452 if (profile_calls()) {
2453 assert(cha_monomorphic_target == nullptr || exact_target == nullptr, "both can not be set");
2454 ciKlass* target_klass = nullptr;
2455 if (cha_monomorphic_target != nullptr) {
2456 target_klass = cha_monomorphic_target->holder();
2457 } else if (exact_target != nullptr) {
2458 target_klass = exact_target->holder();
2459 }
2460 profile_call(target, recv, target_klass, collect_args_for_profiling(args, nullptr, false), false);
2461 }
2462 }
2463 }
2464
2465 Invoke* result = new Invoke(code, result_type, recv, args, target, state_before);
2466 // push result
2467 append_split(result);
2468
2469 if (result_type != voidType) {
2470 push(result_type, round_fp(result));
2471 }
2472 if (profile_return() && result_type->is_object_kind()) {
2473 profile_return_type(result, target);
2474 }
2475 }
2476
2477
2478 void GraphBuilder::new_instance(int klass_index) {
2479 ValueStack* state_before = copy_state_exhandling();
2480 ciKlass* klass = stream()->get_klass();
2481 assert(klass->is_instance_klass(), "must be an instance klass");
2482 if (!stream()->is_unresolved_klass() && klass->is_inlinetype() &&
2483 klass->as_inline_klass()->is_initialized() && klass->as_inline_klass()->is_empty()) {
2484 ciInlineKlass* vk = klass->as_inline_klass();
2485 apush(append(new Constant(new InstanceConstant(vk->default_instance()))));
2486 } else {
2487 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before, stream()->is_unresolved_klass(), false);
2488 _memory->new_instance(new_instance);
2489 apush(append_split(new_instance));
2490 }
2491 }
2492
2493 void GraphBuilder::new_type_array() {
2494 ValueStack* state_before = copy_state_exhandling();
2495 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before)));
2496 }
2497
2498
2499 void GraphBuilder::new_object_array() {
2500 ciKlass* klass = stream()->get_klass();
2501 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2502 NewArray* n = new NewObjectArray(klass, ipop(), state_before);
2503 apush(append_split(n));
2504 }
2505
2506
2507 bool GraphBuilder::direct_compare(ciKlass* k) {
2508 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) {
2509 ciInstanceKlass* ik = k->as_instance_klass();
2510 if (ik->is_final()) {
2511 return true;
2512 } else {
2513 if (DeoptC1 && UseCHA && !(ik->has_subklass() || ik->is_interface())) {
2514 // test class is leaf class
2515 dependency_recorder()->assert_leaf_type(ik);
2516 return true;
2517 }
2518 }
2519 }
2520 return false;
2521 }
2522
2523
2524 void GraphBuilder::check_cast(int klass_index) {
2525 ciKlass* klass = stream()->get_klass();
2526 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_for_exception();
2527 CheckCast* c = new CheckCast(klass, apop(), state_before);
2528 apush(append_split(c));
2529 c->set_direct_compare(direct_compare(klass));
2530
2531 if (is_profiling()) {
2532 // Note that we'd collect profile data in this method if we wanted it.
2533 compilation()->set_would_profile(true);
2534
2535 if (profile_checkcasts()) {
2536 c->set_profiled_method(method());
2537 c->set_profiled_bci(bci());
2538 c->set_should_profile(true);
2539 }
2540 }
2541 }
2542
2543
2544 void GraphBuilder::instance_of(int klass_index) {
2545 ciKlass* klass = stream()->get_klass();
2546 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2547 InstanceOf* i = new InstanceOf(klass, apop(), state_before);
2548 ipush(append_split(i));
2549 i->set_direct_compare(direct_compare(klass));
2550
2551 if (is_profiling()) {
2552 // Note that we'd collect profile data in this method if we wanted it.
2553 compilation()->set_would_profile(true);
2554
2555 if (profile_checkcasts()) {
2556 i->set_profiled_method(method());
2557 i->set_profiled_bci(bci());
2558 i->set_should_profile(true);
2559 }
2560 }
2561 }
2562
2563
2564 void GraphBuilder::monitorenter(Value x, int bci) {
2565 bool maybe_inlinetype = false;
2566 if (bci == InvocationEntryBci) {
2567 // Called by GraphBuilder::inline_sync_entry.
2568 #ifdef ASSERT
2569 ciType* obj_type = x->declared_type();
2570 assert(obj_type == nullptr || !obj_type->is_inlinetype(), "inline types cannot have synchronized methods");
2571 #endif
2572 } else {
2573 // We are compiling a monitorenter bytecode
2574 if (EnableValhalla) {
2575 ciType* obj_type = x->declared_type();
2576 if (obj_type == nullptr || obj_type->as_klass()->can_be_inline_klass()) {
2577 // If we're (possibly) locking on an inline type, check for markWord::always_locked_pattern
2578 // and throw IMSE. (obj_type is null for Phi nodes, so let's just be conservative).
2579 maybe_inlinetype = true;
2580 }
2581 }
2582 }
2583
2584 // save state before locking in case of deoptimization after a NullPointerException
2585 ValueStack* state_before = copy_state_for_exception_with_bci(bci);
2586 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before, maybe_inlinetype), bci);
2587 kill_all();
2588 }
2589
2590
2591 void GraphBuilder::monitorexit(Value x, int bci) {
2592 append_with_bci(new MonitorExit(x, state()->unlock()), bci);
2593 kill_all();
2594 }
2595
2596
2597 void GraphBuilder::new_multi_array(int dimensions) {
2598 ciKlass* klass = stream()->get_klass();
2599 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2600
2601 Values* dims = new Values(dimensions, dimensions, nullptr);
2602 // fill in all dimensions
2603 int i = dimensions;
2604 while (i-- > 0) dims->at_put(i, ipop());
2605 // create array
2606 NewArray* n = new NewMultiArray(klass, dims, state_before);
2607 apush(append_split(n));
2608 }
2609
2610
2611 void GraphBuilder::throw_op(int bci) {
2612 // We require that the debug info for a Throw be the "state before"
2613 // the Throw (i.e., exception oop is still on TOS)
2614 ValueStack* state_before = copy_state_before_with_bci(bci);
2615 Throw* t = new Throw(apop(), state_before);
2616 // operand stack not needed after a throw
2617 state()->truncate_stack(0);
2618 append_with_bci(t, bci);
2619 }
2620
2621
2622 Value GraphBuilder::round_fp(Value fp_value) {
2623 if (strict_fp_requires_explicit_rounding) {
2624 #ifdef IA32
2625 // no rounding needed if SSE2 is used
2626 if (UseSSE < 2) {
2627 // Must currently insert rounding node for doubleword values that
2628 // are results of expressions (i.e., not loads from memory or
2629 // constants)
2630 if (fp_value->type()->tag() == doubleTag &&
2631 fp_value->as_Constant() == nullptr &&
2632 fp_value->as_Local() == nullptr && // method parameters need no rounding
2633 fp_value->as_RoundFP() == nullptr) {
2634 return append(new RoundFP(fp_value));
2635 }
2636 }
2637 #else
2638 Unimplemented();
2639 #endif // IA32
2640 }
2641 return fp_value;
2642 }
2643
2644
2645 Instruction* GraphBuilder::append_with_bci(Instruction* instr, int bci) {
2646 Canonicalizer canon(compilation(), instr, bci);
2647 Instruction* i1 = canon.canonical();
2648 if (i1->is_linked() || !i1->can_be_linked()) {
2649 // Canonicalizer returned an instruction which was already
2650 // appended so simply return it.
2651 return i1;
2652 }
2653
2654 if (UseLocalValueNumbering) {
2655 // Lookup the instruction in the ValueMap and add it to the map if
2656 // it's not found.
2657 Instruction* i2 = vmap()->find_insert(i1);
2658 if (i2 != i1) {
2659 // found an entry in the value map, so just return it.
2660 assert(i2->is_linked(), "should already be linked");
2661 return i2;
2662 }
2663 ValueNumberingEffects vne(vmap());
2664 i1->visit(&vne);
2665 }
2666
2667 // i1 was not eliminated => append it
2668 assert(i1->next() == nullptr, "shouldn't already be linked");
2669 _last = _last->set_next(i1, canon.bci());
2670
2671 if (++_instruction_count >= InstructionCountCutoff && !bailed_out()) {
2672 // set the bailout state but complete normal processing. We
2673 // might do a little more work before noticing the bailout so we
2674 // want processing to continue normally until it's noticed.
2675 bailout("Method and/or inlining is too large");
2676 }
2677
2678 #ifndef PRODUCT
2679 if (PrintIRDuringConstruction) {
2680 InstructionPrinter ip;
2681 ip.print_line(i1);
2682 if (Verbose) {
2683 state()->print();
2684 }
2685 }
2686 #endif
2687
2688 // save state after modification of operand stack for StateSplit instructions
2689 StateSplit* s = i1->as_StateSplit();
2690 if (s != nullptr) {
2691 if (EliminateFieldAccess) {
2692 Intrinsic* intrinsic = s->as_Intrinsic();
2693 if (s->as_Invoke() != nullptr || (intrinsic && !intrinsic->preserves_state())) {
2694 _memory->kill();
2695 }
2696 }
2697 s->set_state(state()->copy(ValueStack::StateAfter, canon.bci()));
2698 }
2699
2700 // set up exception handlers for this instruction if necessary
2701 if (i1->can_trap()) {
2702 i1->set_exception_handlers(handle_exception(i1));
2703 assert(i1->exception_state() != nullptr || !i1->needs_exception_state() || bailed_out(), "handle_exception must set exception state");
2704 }
2705 return i1;
2706 }
2707
2708
2709 Instruction* GraphBuilder::append(Instruction* instr) {
2710 assert(instr->as_StateSplit() == nullptr || instr->as_BlockEnd() != nullptr, "wrong append used");
2711 return append_with_bci(instr, bci());
2712 }
2713
2714
2715 Instruction* GraphBuilder::append_split(StateSplit* instr) {
2716 return append_with_bci(instr, bci());
2717 }
2718
2719
2720 void GraphBuilder::null_check(Value value) {
2721 if (value->as_NewArray() != nullptr || value->as_NewInstance() != nullptr) {
2722 return;
2723 } else {
2724 Constant* con = value->as_Constant();
2725 if (con) {
2726 ObjectType* c = con->type()->as_ObjectType();
2727 if (c && c->is_loaded()) {
2728 ObjectConstant* oc = c->as_ObjectConstant();
2729 if (!oc || !oc->value()->is_null_object()) {
2730 return;
2731 }
2732 }
2733 }
2734 if (value->is_null_free()) return;
2735 }
2736 append(new NullCheck(value, copy_state_for_exception()));
2737 }
2738
2739
2740
2741 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) {
2742 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != nullptr)) {
2743 assert(instruction->exception_state() == nullptr
2744 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState
2745 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->should_retain_local_variables()),
2746 "exception_state should be of exception kind");
2747 return new XHandlers();
2748 }
2749
2750 XHandlers* exception_handlers = new XHandlers();
2751 ScopeData* cur_scope_data = scope_data();
2752 ValueStack* cur_state = instruction->state_before();
2753 ValueStack* prev_state = nullptr;
2754 int scope_count = 0;
2755
2756 assert(cur_state != nullptr, "state_before must be set");
2757 do {
2758 int cur_bci = cur_state->bci();
2759 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2760 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci()
2761 || has_pending_field_access() || has_pending_load_indexed(), "invalid bci");
2762
2763
2764 // join with all potential exception handlers
2765 XHandlers* list = cur_scope_data->xhandlers();
2766 const int n = list->length();
2767 for (int i = 0; i < n; i++) {
2768 XHandler* h = list->handler_at(i);
2769 if (h->covers(cur_bci)) {
2770 // h is a potential exception handler => join it
2771 compilation()->set_has_exception_handlers(true);
2772
2773 BlockBegin* entry = h->entry_block();
2774 if (entry == block()) {
2775 // It's acceptable for an exception handler to cover itself
2776 // but we don't handle that in the parser currently. It's
2777 // very rare so we bailout instead of trying to handle it.
2778 BAILOUT_("exception handler covers itself", exception_handlers);
2779 }
2780 assert(entry->bci() == h->handler_bci(), "must match");
2781 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond");
2782
2783 // previously this was a BAILOUT, but this is not necessary
2784 // now because asynchronous exceptions are not handled this way.
2785 assert(entry->state() == nullptr || cur_state->total_locks_size() == entry->state()->total_locks_size(), "locks do not match");
2786
2787 // xhandler start with an empty expression stack
2788 if (cur_state->stack_size() != 0) {
2789 // locals are preserved
2790 // stack will be truncated
2791 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
2792 }
2793 if (instruction->exception_state() == nullptr) {
2794 instruction->set_exception_state(cur_state);
2795 }
2796
2797 // Note: Usually this join must work. However, very
2798 // complicated jsr-ret structures where we don't ret from
2799 // the subroutine can cause the objects on the monitor
2800 // stacks to not match because blocks can be parsed twice.
2801 // The only test case we've seen so far which exhibits this
2802 // problem is caught by the infinite recursion test in
2803 // GraphBuilder::jsr() if the join doesn't work.
2804 if (!entry->try_merge(cur_state, compilation()->has_irreducible_loops())) {
2805 BAILOUT_("error while joining with exception handler, prob. due to complicated jsr/rets", exception_handlers);
2806 }
2807
2808 // add current state for correct handling of phi functions at begin of xhandler
2809 int phi_operand = entry->add_exception_state(cur_state);
2810
2811 // add entry to the list of xhandlers of this block
2812 _block->add_exception_handler(entry);
2813
2814 // add back-edge from xhandler entry to this block
2815 if (!entry->is_predecessor(_block)) {
2816 entry->add_predecessor(_block);
2817 }
2818
2819 // clone XHandler because phi_operand and scope_count can not be shared
2820 XHandler* new_xhandler = new XHandler(h);
2821 new_xhandler->set_phi_operand(phi_operand);
2822 new_xhandler->set_scope_count(scope_count);
2823 exception_handlers->append(new_xhandler);
2824
2825 // fill in exception handler subgraph lazily
2826 assert(!entry->is_set(BlockBegin::was_visited_flag), "entry must not be visited yet");
2827 cur_scope_data->add_to_work_list(entry);
2828
2829 // stop when reaching catchall
2830 if (h->catch_type() == 0) {
2831 return exception_handlers;
2832 }
2833 }
2834 }
2835
2836 if (exception_handlers->length() == 0) {
2837 // This scope and all callees do not handle exceptions, so the local
2838 // variables of this scope are not needed. However, the scope itself is
2839 // required for a correct exception stack trace -> clear out the locals.
2840 // Stack and locals are invalidated but not truncated in caller state.
2841 if (prev_state != nullptr) {
2842 assert(instruction->exception_state() != nullptr, "missed set?");
2843 ValueStack::Kind exc_kind = ValueStack::empty_exception_kind(true /* caller */);
2844 cur_state = cur_state->copy(exc_kind, cur_state->bci());
2845 // reset caller exception state
2846 prev_state->set_caller_state(cur_state);
2847 } else {
2848 assert(instruction->exception_state() == nullptr, "already set");
2849 // set instruction exception state
2850 // truncate stack
2851 ValueStack::Kind exc_kind = ValueStack::empty_exception_kind();
2852 cur_state = cur_state->copy(exc_kind, cur_state->bci());
2853 instruction->set_exception_state(cur_state);
2854 }
2855 }
2856
2857 // Set up iteration for next time.
2858 // If parsing a jsr, do not grab exception handlers from the
2859 // parent scopes for this method (already got them, and they
2860 // needed to be cloned)
2861
2862 while (cur_scope_data->parsing_jsr()) {
2863 cur_scope_data = cur_scope_data->parent();
2864 }
2865
2866 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2867 assert(cur_state->locks_size() == 0 || cur_state->locks_size() == 1, "unlocking must be done in a catchall exception handler");
2868
2869 prev_state = cur_state;
2870 cur_state = cur_state->caller_state();
2871 cur_scope_data = cur_scope_data->parent();
2872 scope_count++;
2873 } while (cur_scope_data != nullptr);
2874
2875 return exception_handlers;
2876 }
2877
2878
2879 // Helper class for simplifying Phis.
2880 class PhiSimplifier : public BlockClosure {
2881 private:
2882 bool _has_substitutions;
2883 Value simplify(Value v);
2884
2885 public:
2886 PhiSimplifier(BlockBegin* start) : _has_substitutions(false) {
2887 start->iterate_preorder(this);
2888 if (_has_substitutions) {
2889 SubstitutionResolver sr(start);
2890 }
2891 }
2892 void block_do(BlockBegin* b);
2893 bool has_substitutions() const { return _has_substitutions; }
2894 };
2895
2896
2897 Value PhiSimplifier::simplify(Value v) {
2898 Phi* phi = v->as_Phi();
2899
2900 if (phi == nullptr) {
2901 // no phi function
2902 return v;
2903 } else if (v->has_subst()) {
2904 // already substituted; subst can be phi itself -> simplify
2905 return simplify(v->subst());
2906 } else if (phi->is_set(Phi::cannot_simplify)) {
2907 // already tried to simplify phi before
2908 return phi;
2909 } else if (phi->is_set(Phi::visited)) {
2910 // break cycles in phi functions
2911 return phi;
2912 } else if (phi->type()->is_illegal()) {
2913 // illegal phi functions are ignored anyway
2914 return phi;
2915
2916 } else {
2917 // mark phi function as processed to break cycles in phi functions
2918 phi->set(Phi::visited);
2919
2920 // simplify x = [y, x] and x = [y, y] to y
2921 Value subst = nullptr;
2922 int opd_count = phi->operand_count();
2923 for (int i = 0; i < opd_count; i++) {
2924 Value opd = phi->operand_at(i);
2925 assert(opd != nullptr, "Operand must exist!");
2926
2927 if (opd->type()->is_illegal()) {
2928 // if one operand is illegal, the entire phi function is illegal
2929 phi->make_illegal();
2930 phi->clear(Phi::visited);
2931 return phi;
2932 }
2933
2934 Value new_opd = simplify(opd);
2935 assert(new_opd != nullptr, "Simplified operand must exist!");
2936
2937 if (new_opd != phi && new_opd != subst) {
2938 if (subst == nullptr) {
2939 subst = new_opd;
2940 } else {
2941 // no simplification possible
2942 phi->set(Phi::cannot_simplify);
2943 phi->clear(Phi::visited);
2944 return phi;
2945 }
2946 }
2947 }
2948
2949 // successfully simplified phi function
2950 assert(subst != nullptr, "illegal phi function");
2951 _has_substitutions = true;
2952 phi->clear(Phi::visited);
2953 phi->set_subst(subst);
2954
2955 #ifndef PRODUCT
2956 if (PrintPhiFunctions) {
2957 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());
2958 }
2959 #endif
2960
2961 return subst;
2962 }
2963 }
2964
2965
2966 void PhiSimplifier::block_do(BlockBegin* b) {
2967 for_each_phi_fun(b, phi,
2968 simplify(phi);
2969 );
2970
2971 #ifdef ASSERT
2972 for_each_phi_fun(b, phi,
2973 assert(phi->operand_count() != 1 || phi->subst() != phi || phi->is_illegal(), "missed trivial simplification");
2974 );
2975
2976 ValueStack* state = b->state()->caller_state();
2977 for_each_state_value(state, value,
2978 Phi* phi = value->as_Phi();
2979 assert(phi == nullptr || phi->block() != b, "must not have phi function to simplify in caller state");
2980 );
2981 #endif
2982 }
2983
2984 // This method is called after all blocks are filled with HIR instructions
2985 // It eliminates all Phi functions of the form x = [y, y] and x = [y, x]
2986 void GraphBuilder::eliminate_redundant_phis(BlockBegin* start) {
2987 PhiSimplifier simplifier(start);
2988 }
2989
2990
2991 void GraphBuilder::connect_to_end(BlockBegin* beg) {
2992 // setup iteration
2993 kill_all();
2994 _block = beg;
2995 _state = beg->state()->copy_for_parsing();
2996 _last = beg;
2997 iterate_bytecodes_for_block(beg->bci());
2998 }
2999
3000
3001 BlockEnd* GraphBuilder::iterate_bytecodes_for_block(int bci) {
3002 #ifndef PRODUCT
3003 if (PrintIRDuringConstruction) {
3004 tty->cr();
3005 InstructionPrinter ip;
3006 ip.print_instr(_block); tty->cr();
3007 ip.print_stack(_block->state()); tty->cr();
3008 ip.print_inline_level(_block);
3009 ip.print_head();
3010 tty->print_cr("locals size: %d stack size: %d", state()->locals_size(), state()->stack_size());
3011 }
3012 #endif
3013 _skip_block = false;
3014 assert(state() != nullptr, "ValueStack missing!");
3015 CompileLog* log = compilation()->log();
3016 ciBytecodeStream s(method());
3017 s.reset_to_bci(bci);
3018 int prev_bci = bci;
3019 scope_data()->set_stream(&s);
3020 // iterate
3021 Bytecodes::Code code = Bytecodes::_illegal;
3022 bool push_exception = false;
3023
3024 if (block()->is_set(BlockBegin::exception_entry_flag) && block()->next() == nullptr) {
3025 // first thing in the exception entry block should be the exception object.
3026 push_exception = true;
3027 }
3028
3029 bool ignore_return = scope_data()->ignore_return();
3030
3031 while (!bailed_out() && last()->as_BlockEnd() == nullptr &&
3032 (code = stream()->next()) != ciBytecodeStream::EOBC() &&
3033 (block_at(s.cur_bci()) == nullptr || block_at(s.cur_bci()) == block())) {
3034 assert(state()->kind() == ValueStack::Parsing, "invalid state kind");
3035
3036 if (log != nullptr)
3037 log->set_context("bc code='%d' bci='%d'", (int)code, s.cur_bci());
3038
3039 // Check for active jsr during OSR compilation
3040 if (compilation()->is_osr_compile()
3041 && scope()->is_top_scope()
3042 && parsing_jsr()
3043 && s.cur_bci() == compilation()->osr_bci()) {
3044 bailout("OSR not supported while a jsr is active");
3045 }
3046
3047 if (push_exception) {
3048 apush(append(new ExceptionObject()));
3049 push_exception = false;
3050 }
3051
3052 // handle bytecode
3053 switch (code) {
3054 case Bytecodes::_nop : /* nothing to do */ break;
3055 case Bytecodes::_aconst_null : apush(append(new Constant(objectNull ))); break;
3056 case Bytecodes::_iconst_m1 : ipush(append(new Constant(new IntConstant (-1)))); break;
3057 case Bytecodes::_iconst_0 : ipush(append(new Constant(intZero ))); break;
3058 case Bytecodes::_iconst_1 : ipush(append(new Constant(intOne ))); break;
3059 case Bytecodes::_iconst_2 : ipush(append(new Constant(new IntConstant ( 2)))); break;
3060 case Bytecodes::_iconst_3 : ipush(append(new Constant(new IntConstant ( 3)))); break;
3061 case Bytecodes::_iconst_4 : ipush(append(new Constant(new IntConstant ( 4)))); break;
3062 case Bytecodes::_iconst_5 : ipush(append(new Constant(new IntConstant ( 5)))); break;
3063 case Bytecodes::_lconst_0 : lpush(append(new Constant(new LongConstant ( 0)))); break;
3064 case Bytecodes::_lconst_1 : lpush(append(new Constant(new LongConstant ( 1)))); break;
3065 case Bytecodes::_fconst_0 : fpush(append(new Constant(new FloatConstant ( 0)))); break;
3066 case Bytecodes::_fconst_1 : fpush(append(new Constant(new FloatConstant ( 1)))); break;
3067 case Bytecodes::_fconst_2 : fpush(append(new Constant(new FloatConstant ( 2)))); break;
3068 case Bytecodes::_dconst_0 : dpush(append(new Constant(new DoubleConstant( 0)))); break;
3069 case Bytecodes::_dconst_1 : dpush(append(new Constant(new DoubleConstant( 1)))); break;
3070 case Bytecodes::_bipush : ipush(append(new Constant(new IntConstant(((signed char*)s.cur_bcp())[1])))); break;
3071 case Bytecodes::_sipush : ipush(append(new Constant(new IntConstant((short)Bytes::get_Java_u2(s.cur_bcp()+1))))); break;
3072 case Bytecodes::_ldc : // fall through
3073 case Bytecodes::_ldc_w : // fall through
3074 case Bytecodes::_ldc2_w : load_constant(); break;
3075 case Bytecodes::_iload : load_local(intType , s.get_index()); break;
3076 case Bytecodes::_lload : load_local(longType , s.get_index()); break;
3077 case Bytecodes::_fload : load_local(floatType , s.get_index()); break;
3078 case Bytecodes::_dload : load_local(doubleType , s.get_index()); break;
3079 case Bytecodes::_aload : load_local(instanceType, s.get_index()); break;
3080 case Bytecodes::_iload_0 : load_local(intType , 0); break;
3081 case Bytecodes::_iload_1 : load_local(intType , 1); break;
3082 case Bytecodes::_iload_2 : load_local(intType , 2); break;
3083 case Bytecodes::_iload_3 : load_local(intType , 3); break;
3084 case Bytecodes::_lload_0 : load_local(longType , 0); break;
3085 case Bytecodes::_lload_1 : load_local(longType , 1); break;
3086 case Bytecodes::_lload_2 : load_local(longType , 2); break;
3087 case Bytecodes::_lload_3 : load_local(longType , 3); break;
3088 case Bytecodes::_fload_0 : load_local(floatType , 0); break;
3089 case Bytecodes::_fload_1 : load_local(floatType , 1); break;
3090 case Bytecodes::_fload_2 : load_local(floatType , 2); break;
3091 case Bytecodes::_fload_3 : load_local(floatType , 3); break;
3092 case Bytecodes::_dload_0 : load_local(doubleType, 0); break;
3093 case Bytecodes::_dload_1 : load_local(doubleType, 1); break;
3094 case Bytecodes::_dload_2 : load_local(doubleType, 2); break;
3095 case Bytecodes::_dload_3 : load_local(doubleType, 3); break;
3096 case Bytecodes::_aload_0 : load_local(objectType, 0); break;
3097 case Bytecodes::_aload_1 : load_local(objectType, 1); break;
3098 case Bytecodes::_aload_2 : load_local(objectType, 2); break;
3099 case Bytecodes::_aload_3 : load_local(objectType, 3); break;
3100 case Bytecodes::_iaload : load_indexed(T_INT ); break;
3101 case Bytecodes::_laload : load_indexed(T_LONG ); break;
3102 case Bytecodes::_faload : load_indexed(T_FLOAT ); break;
3103 case Bytecodes::_daload : load_indexed(T_DOUBLE); break;
3104 case Bytecodes::_aaload : load_indexed(T_OBJECT); break;
3105 case Bytecodes::_baload : load_indexed(T_BYTE ); break;
3106 case Bytecodes::_caload : load_indexed(T_CHAR ); break;
3107 case Bytecodes::_saload : load_indexed(T_SHORT ); break;
3108 case Bytecodes::_istore : store_local(intType , s.get_index()); break;
3109 case Bytecodes::_lstore : store_local(longType , s.get_index()); break;
3110 case Bytecodes::_fstore : store_local(floatType , s.get_index()); break;
3111 case Bytecodes::_dstore : store_local(doubleType, s.get_index()); break;
3112 case Bytecodes::_astore : store_local(objectType, s.get_index()); break;
3113 case Bytecodes::_istore_0 : store_local(intType , 0); break;
3114 case Bytecodes::_istore_1 : store_local(intType , 1); break;
3115 case Bytecodes::_istore_2 : store_local(intType , 2); break;
3116 case Bytecodes::_istore_3 : store_local(intType , 3); break;
3117 case Bytecodes::_lstore_0 : store_local(longType , 0); break;
3118 case Bytecodes::_lstore_1 : store_local(longType , 1); break;
3119 case Bytecodes::_lstore_2 : store_local(longType , 2); break;
3120 case Bytecodes::_lstore_3 : store_local(longType , 3); break;
3121 case Bytecodes::_fstore_0 : store_local(floatType , 0); break;
3122 case Bytecodes::_fstore_1 : store_local(floatType , 1); break;
3123 case Bytecodes::_fstore_2 : store_local(floatType , 2); break;
3124 case Bytecodes::_fstore_3 : store_local(floatType , 3); break;
3125 case Bytecodes::_dstore_0 : store_local(doubleType, 0); break;
3126 case Bytecodes::_dstore_1 : store_local(doubleType, 1); break;
3127 case Bytecodes::_dstore_2 : store_local(doubleType, 2); break;
3128 case Bytecodes::_dstore_3 : store_local(doubleType, 3); break;
3129 case Bytecodes::_astore_0 : store_local(objectType, 0); break;
3130 case Bytecodes::_astore_1 : store_local(objectType, 1); break;
3131 case Bytecodes::_astore_2 : store_local(objectType, 2); break;
3132 case Bytecodes::_astore_3 : store_local(objectType, 3); break;
3133 case Bytecodes::_iastore : store_indexed(T_INT ); break;
3134 case Bytecodes::_lastore : store_indexed(T_LONG ); break;
3135 case Bytecodes::_fastore : store_indexed(T_FLOAT ); break;
3136 case Bytecodes::_dastore : store_indexed(T_DOUBLE); break;
3137 case Bytecodes::_aastore : store_indexed(T_OBJECT); break;
3138 case Bytecodes::_bastore : store_indexed(T_BYTE ); break;
3139 case Bytecodes::_castore : store_indexed(T_CHAR ); break;
3140 case Bytecodes::_sastore : store_indexed(T_SHORT ); break;
3141 case Bytecodes::_pop : // fall through
3142 case Bytecodes::_pop2 : // fall through
3143 case Bytecodes::_dup : // fall through
3144 case Bytecodes::_dup_x1 : // fall through
3145 case Bytecodes::_dup_x2 : // fall through
3146 case Bytecodes::_dup2 : // fall through
3147 case Bytecodes::_dup2_x1 : // fall through
3148 case Bytecodes::_dup2_x2 : // fall through
3149 case Bytecodes::_swap : stack_op(code); break;
3150 case Bytecodes::_iadd : arithmetic_op(intType , code); break;
3151 case Bytecodes::_ladd : arithmetic_op(longType , code); break;
3152 case Bytecodes::_fadd : arithmetic_op(floatType , code); break;
3153 case Bytecodes::_dadd : arithmetic_op(doubleType, code); break;
3154 case Bytecodes::_isub : arithmetic_op(intType , code); break;
3155 case Bytecodes::_lsub : arithmetic_op(longType , code); break;
3156 case Bytecodes::_fsub : arithmetic_op(floatType , code); break;
3157 case Bytecodes::_dsub : arithmetic_op(doubleType, code); break;
3158 case Bytecodes::_imul : arithmetic_op(intType , code); break;
3159 case Bytecodes::_lmul : arithmetic_op(longType , code); break;
3160 case Bytecodes::_fmul : arithmetic_op(floatType , code); break;
3161 case Bytecodes::_dmul : arithmetic_op(doubleType, code); break;
3162 case Bytecodes::_idiv : arithmetic_op(intType , code, copy_state_for_exception()); break;
3163 case Bytecodes::_ldiv : arithmetic_op(longType , code, copy_state_for_exception()); break;
3164 case Bytecodes::_fdiv : arithmetic_op(floatType , code); break;
3165 case Bytecodes::_ddiv : arithmetic_op(doubleType, code); break;
3166 case Bytecodes::_irem : arithmetic_op(intType , code, copy_state_for_exception()); break;
3167 case Bytecodes::_lrem : arithmetic_op(longType , code, copy_state_for_exception()); break;
3168 case Bytecodes::_frem : arithmetic_op(floatType , code); break;
3169 case Bytecodes::_drem : arithmetic_op(doubleType, code); break;
3170 case Bytecodes::_ineg : negate_op(intType ); break;
3171 case Bytecodes::_lneg : negate_op(longType ); break;
3172 case Bytecodes::_fneg : negate_op(floatType ); break;
3173 case Bytecodes::_dneg : negate_op(doubleType); break;
3174 case Bytecodes::_ishl : shift_op(intType , code); break;
3175 case Bytecodes::_lshl : shift_op(longType, code); break;
3176 case Bytecodes::_ishr : shift_op(intType , code); break;
3177 case Bytecodes::_lshr : shift_op(longType, code); break;
3178 case Bytecodes::_iushr : shift_op(intType , code); break;
3179 case Bytecodes::_lushr : shift_op(longType, code); break;
3180 case Bytecodes::_iand : logic_op(intType , code); break;
3181 case Bytecodes::_land : logic_op(longType, code); break;
3182 case Bytecodes::_ior : logic_op(intType , code); break;
3183 case Bytecodes::_lor : logic_op(longType, code); break;
3184 case Bytecodes::_ixor : logic_op(intType , code); break;
3185 case Bytecodes::_lxor : logic_op(longType, code); break;
3186 case Bytecodes::_iinc : increment(); break;
3187 case Bytecodes::_i2l : convert(code, T_INT , T_LONG ); break;
3188 case Bytecodes::_i2f : convert(code, T_INT , T_FLOAT ); break;
3189 case Bytecodes::_i2d : convert(code, T_INT , T_DOUBLE); break;
3190 case Bytecodes::_l2i : convert(code, T_LONG , T_INT ); break;
3191 case Bytecodes::_l2f : convert(code, T_LONG , T_FLOAT ); break;
3192 case Bytecodes::_l2d : convert(code, T_LONG , T_DOUBLE); break;
3193 case Bytecodes::_f2i : convert(code, T_FLOAT , T_INT ); break;
3194 case Bytecodes::_f2l : convert(code, T_FLOAT , T_LONG ); break;
3195 case Bytecodes::_f2d : convert(code, T_FLOAT , T_DOUBLE); break;
3196 case Bytecodes::_d2i : convert(code, T_DOUBLE, T_INT ); break;
3197 case Bytecodes::_d2l : convert(code, T_DOUBLE, T_LONG ); break;
3198 case Bytecodes::_d2f : convert(code, T_DOUBLE, T_FLOAT ); break;
3199 case Bytecodes::_i2b : convert(code, T_INT , T_BYTE ); break;
3200 case Bytecodes::_i2c : convert(code, T_INT , T_CHAR ); break;
3201 case Bytecodes::_i2s : convert(code, T_INT , T_SHORT ); break;
3202 case Bytecodes::_lcmp : compare_op(longType , code); break;
3203 case Bytecodes::_fcmpl : compare_op(floatType , code); break;
3204 case Bytecodes::_fcmpg : compare_op(floatType , code); break;
3205 case Bytecodes::_dcmpl : compare_op(doubleType, code); break;
3206 case Bytecodes::_dcmpg : compare_op(doubleType, code); break;
3207 case Bytecodes::_ifeq : if_zero(intType , If::eql); break;
3208 case Bytecodes::_ifne : if_zero(intType , If::neq); break;
3209 case Bytecodes::_iflt : if_zero(intType , If::lss); break;
3210 case Bytecodes::_ifge : if_zero(intType , If::geq); break;
3211 case Bytecodes::_ifgt : if_zero(intType , If::gtr); break;
3212 case Bytecodes::_ifle : if_zero(intType , If::leq); break;
3213 case Bytecodes::_if_icmpeq : if_same(intType , If::eql); break;
3214 case Bytecodes::_if_icmpne : if_same(intType , If::neq); break;
3215 case Bytecodes::_if_icmplt : if_same(intType , If::lss); break;
3216 case Bytecodes::_if_icmpge : if_same(intType , If::geq); break;
3217 case Bytecodes::_if_icmpgt : if_same(intType , If::gtr); break;
3218 case Bytecodes::_if_icmple : if_same(intType , If::leq); break;
3219 case Bytecodes::_if_acmpeq : if_same(objectType, If::eql); break;
3220 case Bytecodes::_if_acmpne : if_same(objectType, If::neq); break;
3221 case Bytecodes::_goto : _goto(s.cur_bci(), s.get_dest()); break;
3222 case Bytecodes::_jsr : jsr(s.get_dest()); break;
3223 case Bytecodes::_ret : ret(s.get_index()); break;
3224 case Bytecodes::_tableswitch : table_switch(); break;
3225 case Bytecodes::_lookupswitch : lookup_switch(); break;
3226 case Bytecodes::_ireturn : method_return(ipop(), ignore_return); break;
3227 case Bytecodes::_lreturn : method_return(lpop(), ignore_return); break;
3228 case Bytecodes::_freturn : method_return(fpop(), ignore_return); break;
3229 case Bytecodes::_dreturn : method_return(dpop(), ignore_return); break;
3230 case Bytecodes::_areturn : method_return(apop(), ignore_return); break;
3231 case Bytecodes::_return : method_return(nullptr, ignore_return); break;
3232 case Bytecodes::_getstatic : // fall through
3233 case Bytecodes::_putstatic : // fall through
3234 case Bytecodes::_getfield : // fall through
3235 case Bytecodes::_putfield : access_field(code); break;
3236 case Bytecodes::_invokevirtual : // fall through
3237 case Bytecodes::_invokespecial : // fall through
3238 case Bytecodes::_invokestatic : // fall through
3239 case Bytecodes::_invokedynamic : // fall through
3240 case Bytecodes::_invokeinterface: invoke(code); break;
3241 case Bytecodes::_new : new_instance(s.get_index_u2()); break;
3242 case Bytecodes::_newarray : new_type_array(); break;
3243 case Bytecodes::_anewarray : new_object_array(); break;
3244 case Bytecodes::_arraylength : { ValueStack* state_before = copy_state_for_exception(); ipush(append(new ArrayLength(apop(), state_before))); break; }
3245 case Bytecodes::_athrow : throw_op(s.cur_bci()); break;
3246 case Bytecodes::_checkcast : check_cast(s.get_index_u2()); break;
3247 case Bytecodes::_instanceof : instance_of(s.get_index_u2()); break;
3248 case Bytecodes::_monitorenter : monitorenter(apop(), s.cur_bci()); break;
3249 case Bytecodes::_monitorexit : monitorexit (apop(), s.cur_bci()); break;
3250 case Bytecodes::_wide : ShouldNotReachHere(); break;
3251 case Bytecodes::_multianewarray : new_multi_array(s.cur_bcp()[3]); break;
3252 case Bytecodes::_ifnull : if_null(objectType, If::eql); break;
3253 case Bytecodes::_ifnonnull : if_null(objectType, If::neq); break;
3254 case Bytecodes::_goto_w : _goto(s.cur_bci(), s.get_far_dest()); break;
3255 case Bytecodes::_jsr_w : jsr(s.get_far_dest()); break;
3256 case Bytecodes::_breakpoint : BAILOUT_("concurrent setting of breakpoint", nullptr);
3257 default : ShouldNotReachHere(); break;
3258 }
3259
3260 if (log != nullptr)
3261 log->clear_context(); // skip marker if nothing was printed
3262
3263 // save current bci to setup Goto at the end
3264 prev_bci = s.cur_bci();
3265
3266 }
3267 CHECK_BAILOUT_(nullptr);
3268 // stop processing of this block (see try_inline_full)
3269 if (_skip_block) {
3270 _skip_block = false;
3271 assert(_last && _last->as_BlockEnd(), "");
3272 return _last->as_BlockEnd();
3273 }
3274 // if there are any, check if last instruction is a BlockEnd instruction
3275 BlockEnd* end = last()->as_BlockEnd();
3276 if (end == nullptr) {
3277 // all blocks must end with a BlockEnd instruction => add a Goto
3278 end = new Goto(block_at(s.cur_bci()), false);
3279 append(end);
3280 }
3281 assert(end == last()->as_BlockEnd(), "inconsistency");
3282
3283 assert(end->state() != nullptr, "state must already be present");
3284 assert(end->as_Return() == nullptr || end->as_Throw() == nullptr || end->state()->stack_size() == 0, "stack not needed for return and throw");
3285
3286 // connect to begin & set state
3287 // NOTE that inlining may have changed the block we are parsing
3288 block()->set_end(end);
3289 // propagate state
3290 for (int i = end->number_of_sux() - 1; i >= 0; i--) {
3291 BlockBegin* sux = end->sux_at(i);
3292 assert(sux->is_predecessor(block()), "predecessor missing");
3293 // be careful, bailout if bytecodes are strange
3294 if (!sux->try_merge(end->state(), compilation()->has_irreducible_loops())) BAILOUT_("block join failed", nullptr);
3295 scope_data()->add_to_work_list(end->sux_at(i));
3296 }
3297
3298 scope_data()->set_stream(nullptr);
3299
3300 // done
3301 return end;
3302 }
3303
3304
3305 void GraphBuilder::iterate_all_blocks(bool start_in_current_block_for_inlining) {
3306 do {
3307 if (start_in_current_block_for_inlining && !bailed_out()) {
3308 iterate_bytecodes_for_block(0);
3309 start_in_current_block_for_inlining = false;
3310 } else {
3311 BlockBegin* b;
3312 while ((b = scope_data()->remove_from_work_list()) != nullptr) {
3313 if (!b->is_set(BlockBegin::was_visited_flag)) {
3314 if (b->is_set(BlockBegin::osr_entry_flag)) {
3315 // we're about to parse the osr entry block, so make sure
3316 // we setup the OSR edge leading into this block so that
3317 // Phis get setup correctly.
3318 setup_osr_entry_block();
3319 // this is no longer the osr entry block, so clear it.
3320 b->clear(BlockBegin::osr_entry_flag);
3321 }
3322 b->set(BlockBegin::was_visited_flag);
3323 connect_to_end(b);
3324 }
3325 }
3326 }
3327 } while (!bailed_out() && !scope_data()->is_work_list_empty());
3328 }
3329
3330
3331 bool GraphBuilder::_can_trap [Bytecodes::number_of_java_codes];
3332
3333 void GraphBuilder::initialize() {
3334 // the following bytecodes are assumed to potentially
3335 // throw exceptions in compiled code - note that e.g.
3336 // monitorexit & the return bytecodes do not throw
3337 // exceptions since monitor pairing proved that they
3338 // succeed (if monitor pairing succeeded)
3339 Bytecodes::Code can_trap_list[] =
3340 { Bytecodes::_ldc
3341 , Bytecodes::_ldc_w
3342 , Bytecodes::_ldc2_w
3343 , Bytecodes::_iaload
3344 , Bytecodes::_laload
3345 , Bytecodes::_faload
3346 , Bytecodes::_daload
3347 , Bytecodes::_aaload
3348 , Bytecodes::_baload
3349 , Bytecodes::_caload
3350 , Bytecodes::_saload
3351 , Bytecodes::_iastore
3352 , Bytecodes::_lastore
3353 , Bytecodes::_fastore
3354 , Bytecodes::_dastore
3355 , Bytecodes::_aastore
3356 , Bytecodes::_bastore
3357 , Bytecodes::_castore
3358 , Bytecodes::_sastore
3359 , Bytecodes::_idiv
3360 , Bytecodes::_ldiv
3361 , Bytecodes::_irem
3362 , Bytecodes::_lrem
3363 , Bytecodes::_getstatic
3364 , Bytecodes::_putstatic
3365 , Bytecodes::_getfield
3366 , Bytecodes::_putfield
3367 , Bytecodes::_invokevirtual
3368 , Bytecodes::_invokespecial
3369 , Bytecodes::_invokestatic
3370 , Bytecodes::_invokedynamic
3371 , Bytecodes::_invokeinterface
3372 , Bytecodes::_new
3373 , Bytecodes::_newarray
3374 , Bytecodes::_anewarray
3375 , Bytecodes::_arraylength
3376 , Bytecodes::_athrow
3377 , Bytecodes::_checkcast
3378 , Bytecodes::_instanceof
3379 , Bytecodes::_monitorenter
3380 , Bytecodes::_multianewarray
3381 };
3382
3383 // inititialize trap tables
3384 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) {
3385 _can_trap[i] = false;
3386 }
3387 // set standard trap info
3388 for (uint j = 0; j < ARRAY_SIZE(can_trap_list); j++) {
3389 _can_trap[can_trap_list[j]] = true;
3390 }
3391 }
3392
3393
3394 BlockBegin* GraphBuilder::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) {
3395 assert(entry->is_set(f), "entry/flag mismatch");
3396 // create header block
3397 BlockBegin* h = new BlockBegin(entry->bci());
3398 h->set_depth_first_number(0);
3399
3400 Value l = h;
3401 BlockEnd* g = new Goto(entry, false);
3402 l->set_next(g, entry->bci());
3403 h->set_end(g);
3404 h->set(f);
3405 // setup header block end state
3406 ValueStack* s = state->copy(ValueStack::StateAfter, entry->bci()); // can use copy since stack is empty (=> no phis)
3407 assert(s->stack_is_empty(), "must have empty stack at entry point");
3408 g->set_state(s);
3409 return h;
3410 }
3411
3412
3413
3414 BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* state) {
3415 BlockBegin* start = new BlockBegin(0);
3416
3417 // This code eliminates the empty start block at the beginning of
3418 // each method. Previously, each method started with the
3419 // start-block created below, and this block was followed by the
3420 // header block that was always empty. This header block is only
3421 // necessary if std_entry is also a backward branch target because
3422 // then phi functions may be necessary in the header block. It's
3423 // also necessary when profiling so that there's a single block that
3424 // can increment the counters.
3425 // In addition, with range check elimination, we may need a valid block
3426 // that dominates all the rest to insert range predicates.
3427 BlockBegin* new_header_block;
3428 if (std_entry->number_of_preds() > 0 || is_profiling() || RangeCheckElimination) {
3429 new_header_block = header_block(std_entry, BlockBegin::std_entry_flag, state);
3430 } else {
3431 new_header_block = std_entry;
3432 }
3433
3434 // setup start block (root for the IR graph)
3435 Base* base =
3436 new Base(
3437 new_header_block,
3438 osr_entry
3439 );
3440 start->set_next(base, 0);
3441 start->set_end(base);
3442 // create & setup state for start block
3443 start->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
3444 base->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
3445
3446 if (base->std_entry()->state() == nullptr) {
3447 // setup states for header blocks
3448 base->std_entry()->merge(state, compilation()->has_irreducible_loops());
3449 }
3450
3451 assert(base->std_entry()->state() != nullptr, "");
3452 return start;
3453 }
3454
3455
3456 void GraphBuilder::setup_osr_entry_block() {
3457 assert(compilation()->is_osr_compile(), "only for osrs");
3458
3459 int osr_bci = compilation()->osr_bci();
3460 ciBytecodeStream s(method());
3461 s.reset_to_bci(osr_bci);
3462 s.next();
3463 scope_data()->set_stream(&s);
3464
3465 // create a new block to be the osr setup code
3466 _osr_entry = new BlockBegin(osr_bci);
3467 _osr_entry->set(BlockBegin::osr_entry_flag);
3468 _osr_entry->set_depth_first_number(0);
3469 BlockBegin* target = bci2block()->at(osr_bci);
3470 assert(target != nullptr && target->is_set(BlockBegin::osr_entry_flag), "must be there");
3471 // the osr entry has no values for locals
3472 ValueStack* state = target->state()->copy();
3473 _osr_entry->set_state(state);
3474
3475 kill_all();
3476 _block = _osr_entry;
3477 _state = _osr_entry->state()->copy();
3478 assert(_state->bci() == osr_bci, "mismatch");
3479 _last = _osr_entry;
3480 Value e = append(new OsrEntry());
3481 e->set_needs_null_check(false);
3482
3483 // OSR buffer is
3484 //
3485 // locals[nlocals-1..0]
3486 // monitors[number_of_locks-1..0]
3487 //
3488 // locals is a direct copy of the interpreter frame so in the osr buffer
3489 // so first slot in the local array is the last local from the interpreter
3490 // and last slot is local[0] (receiver) from the interpreter
3491 //
3492 // Similarly with locks. The first lock slot in the osr buffer is the nth lock
3493 // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock
3494 // in the interpreter frame (the method lock if a sync method)
3495
3496 // Initialize monitors in the compiled activation.
3497
3498 int index;
3499 Value local;
3500
3501 // find all the locals that the interpreter thinks contain live oops
3502 const ResourceBitMap live_oops = method()->live_local_oops_at_bci(osr_bci);
3503
3504 // compute the offset into the locals so that we can treat the buffer
3505 // as if the locals were still in the interpreter frame
3506 int locals_offset = BytesPerWord * (method()->max_locals() - 1);
3507 for_each_local_value(state, index, local) {
3508 int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord;
3509 Value get;
3510 if (local->type()->is_object_kind() && !live_oops.at(index)) {
3511 // The interpreter thinks this local is dead but the compiler
3512 // doesn't so pretend that the interpreter passed in null.
3513 get = append(new Constant(objectNull));
3514 } else {
3515 Value off_val = append(new Constant(new IntConstant(offset)));
3516 get = append(new UnsafeGet(as_BasicType(local->type()), e,
3517 off_val,
3518 false/*is_volatile*/,
3519 true/*is_raw*/));
3520 }
3521 _state->store_local(index, get);
3522 }
3523
3524 // the storage for the OSR buffer is freed manually in the LIRGenerator.
3525
3526 assert(state->caller_state() == nullptr, "should be top scope");
3527 state->clear_locals();
3528 Goto* g = new Goto(target, false);
3529 append(g);
3530 _osr_entry->set_end(g);
3531 target->merge(_osr_entry->end()->state(), compilation()->has_irreducible_loops());
3532
3533 scope_data()->set_stream(nullptr);
3534 }
3535
3536
3537 ValueStack* GraphBuilder::state_at_entry() {
3538 ValueStack* state = new ValueStack(scope(), nullptr);
3539
3540 // Set up locals for receiver
3541 int idx = 0;
3542 if (!method()->is_static()) {
3543 // we should always see the receiver
3544 state->store_local(idx, new Local(method()->holder(), objectType, idx,
3545 /*receiver*/ true, /*null_free*/ method()->holder()->is_flat_array_klass()));
3546 idx = 1;
3547 }
3548
3549 // Set up locals for incoming arguments
3550 ciSignature* sig = method()->signature();
3551 for (int i = 0; i < sig->count(); i++) {
3552 ciType* type = sig->type_at(i);
3553 BasicType basic_type = type->basic_type();
3554 // don't allow T_ARRAY to propagate into locals types
3555 if (is_reference_type(basic_type)) basic_type = T_OBJECT;
3556 ValueType* vt = as_ValueType(basic_type);
3557 state->store_local(idx, new Local(type, vt, idx, false, false));
3558 idx += type->size();
3559 }
3560
3561 // lock synchronized method
3562 if (method()->is_synchronized()) {
3563 state->lock(nullptr);
3564 }
3565
3566 return state;
3567 }
3568
3569
3570 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope)
3571 : _scope_data(nullptr)
3572 , _compilation(compilation)
3573 , _memory(new MemoryBuffer())
3574 , _inline_bailout_msg(nullptr)
3575 , _instruction_count(0)
3576 , _osr_entry(nullptr)
3577 , _pending_field_access(nullptr)
3578 , _pending_load_indexed(nullptr)
3579 {
3580 int osr_bci = compilation->osr_bci();
3581
3582 // determine entry points and bci2block mapping
3583 BlockListBuilder blm(compilation, scope, osr_bci);
3584 CHECK_BAILOUT();
3585
3586 BlockList* bci2block = blm.bci2block();
3587 BlockBegin* start_block = bci2block->at(0);
3588
3589 push_root_scope(scope, bci2block, start_block);
3590
3591 // setup state for std entry
3592 _initial_state = state_at_entry();
3593 start_block->merge(_initial_state, compilation->has_irreducible_loops());
3594
3595 // End nulls still exist here
3596
3597 // complete graph
3598 _vmap = new ValueMap();
3599 switch (scope->method()->intrinsic_id()) {
3600 case vmIntrinsics::_dabs : // fall through
3601 case vmIntrinsics::_dsqrt : // fall through
3602 case vmIntrinsics::_dsqrt_strict : // fall through
3603 case vmIntrinsics::_dsin : // fall through
3604 case vmIntrinsics::_dcos : // fall through
3605 case vmIntrinsics::_dtan : // fall through
3606 case vmIntrinsics::_dlog : // fall through
3607 case vmIntrinsics::_dlog10 : // fall through
3608 case vmIntrinsics::_dexp : // fall through
3609 case vmIntrinsics::_dpow : // fall through
3610 {
3611 // Compiles where the root method is an intrinsic need a special
3612 // compilation environment because the bytecodes for the method
3613 // shouldn't be parsed during the compilation, only the special
3614 // Intrinsic node should be emitted. If this isn't done the
3615 // code for the inlined version will be different than the root
3616 // compiled version which could lead to monotonicity problems on
3617 // intel.
3618 if (CheckIntrinsics && !scope->method()->intrinsic_candidate()) {
3619 BAILOUT("failed to inline intrinsic, method not annotated");
3620 }
3621
3622 // Set up a stream so that appending instructions works properly.
3623 ciBytecodeStream s(scope->method());
3624 s.reset_to_bci(0);
3625 scope_data()->set_stream(&s);
3626 s.next();
3627
3628 // setup the initial block state
3629 _block = start_block;
3630 _state = start_block->state()->copy_for_parsing();
3631 _last = start_block;
3632 load_local(doubleType, 0);
3633 if (scope->method()->intrinsic_id() == vmIntrinsics::_dpow) {
3634 load_local(doubleType, 2);
3635 }
3636
3637 // Emit the intrinsic node.
3638 bool result = try_inline_intrinsics(scope->method());
3639 if (!result) BAILOUT("failed to inline intrinsic");
3640 method_return(dpop());
3641
3642 // connect the begin and end blocks and we're all done.
3643 BlockEnd* end = last()->as_BlockEnd();
3644 block()->set_end(end);
3645 break;
3646 }
3647
3648 case vmIntrinsics::_Reference_get:
3649 {
3650 {
3651 // With java.lang.ref.reference.get() we must go through the
3652 // intrinsic - when G1 is enabled - even when get() is the root
3653 // method of the compile so that, if necessary, the value in
3654 // the referent field of the reference object gets recorded by
3655 // the pre-barrier code.
3656 // Specifically, if G1 is enabled, the value in the referent
3657 // field is recorded by the G1 SATB pre barrier. This will
3658 // result in the referent being marked live and the reference
3659 // object removed from the list of discovered references during
3660 // reference processing.
3661 if (CheckIntrinsics && !scope->method()->intrinsic_candidate()) {
3662 BAILOUT("failed to inline intrinsic, method not annotated");
3663 }
3664
3665 // Also we need intrinsic to prevent commoning reads from this field
3666 // across safepoint since GC can change its value.
3667
3668 // Set up a stream so that appending instructions works properly.
3669 ciBytecodeStream s(scope->method());
3670 s.reset_to_bci(0);
3671 scope_data()->set_stream(&s);
3672 s.next();
3673
3674 // setup the initial block state
3675 _block = start_block;
3676 _state = start_block->state()->copy_for_parsing();
3677 _last = start_block;
3678 load_local(objectType, 0);
3679
3680 // Emit the intrinsic node.
3681 bool result = try_inline_intrinsics(scope->method());
3682 if (!result) BAILOUT("failed to inline intrinsic");
3683 method_return(apop());
3684
3685 // connect the begin and end blocks and we're all done.
3686 BlockEnd* end = last()->as_BlockEnd();
3687 block()->set_end(end);
3688 break;
3689 }
3690 // Otherwise, fall thru
3691 }
3692
3693 default:
3694 scope_data()->add_to_work_list(start_block);
3695 iterate_all_blocks();
3696 break;
3697 }
3698 CHECK_BAILOUT();
3699
3700 # ifdef ASSERT
3701 // For all blocks reachable from start_block: _end must be non-null
3702 {
3703 BlockList processed;
3704 BlockList to_go;
3705 to_go.append(start_block);
3706 while(to_go.length() > 0) {
3707 BlockBegin* current = to_go.pop();
3708 assert(current != nullptr, "Should not happen.");
3709 assert(current->end() != nullptr, "All blocks reachable from start_block should have end() != nullptr.");
3710 processed.append(current);
3711 for(int i = 0; i < current->number_of_sux(); i++) {
3712 BlockBegin* s = current->sux_at(i);
3713 if (!processed.contains(s)) {
3714 to_go.append(s);
3715 }
3716 }
3717 }
3718 }
3719 #endif // ASSERT
3720
3721 _start = setup_start_block(osr_bci, start_block, _osr_entry, _initial_state);
3722
3723 eliminate_redundant_phis(_start);
3724
3725 NOT_PRODUCT(if (PrintValueNumbering && Verbose) print_stats());
3726 // for osr compile, bailout if some requirements are not fulfilled
3727 if (osr_bci != -1) {
3728 BlockBegin* osr_block = blm.bci2block()->at(osr_bci);
3729 if (!osr_block->is_set(BlockBegin::was_visited_flag)) {
3730 BAILOUT("osr entry must have been visited for osr compile");
3731 }
3732
3733 // check if osr entry point has empty stack - we cannot handle non-empty stacks at osr entry points
3734 if (!osr_block->state()->stack_is_empty()) {
3735 BAILOUT("stack not empty at OSR entry point");
3736 }
3737 }
3738 #ifndef PRODUCT
3739 if (PrintCompilation && Verbose) tty->print_cr("Created %d Instructions", _instruction_count);
3740 #endif
3741 }
3742
3743
3744 ValueStack* GraphBuilder::copy_state_before() {
3745 return copy_state_before_with_bci(bci());
3746 }
3747
3748 ValueStack* GraphBuilder::copy_state_exhandling() {
3749 return copy_state_exhandling_with_bci(bci());
3750 }
3751
3752 ValueStack* GraphBuilder::copy_state_for_exception() {
3753 return copy_state_for_exception_with_bci(bci());
3754 }
3755
3756 ValueStack* GraphBuilder::copy_state_before_with_bci(int bci) {
3757 return state()->copy(ValueStack::StateBefore, bci);
3758 }
3759
3760 ValueStack* GraphBuilder::copy_state_exhandling_with_bci(int bci) {
3761 if (!has_handler()) return nullptr;
3762 return state()->copy(ValueStack::StateBefore, bci);
3763 }
3764
3765 ValueStack* GraphBuilder::copy_state_for_exception_with_bci(int bci) {
3766 ValueStack* s = copy_state_exhandling_with_bci(bci);
3767 if (s == nullptr) {
3768 // no handler, no need to retain locals
3769 ValueStack::Kind exc_kind = ValueStack::empty_exception_kind();
3770 s = state()->copy(exc_kind, bci);
3771 }
3772 return s;
3773 }
3774
3775 int GraphBuilder::recursive_inline_level(ciMethod* cur_callee) const {
3776 int recur_level = 0;
3777 for (IRScope* s = scope(); s != nullptr; s = s->caller()) {
3778 if (s->method() == cur_callee) {
3779 ++recur_level;
3780 }
3781 }
3782 return recur_level;
3783 }
3784
3785 static void set_flags_for_inlined_callee(Compilation* compilation, ciMethod* callee) {
3786 if (callee->has_reserved_stack_access()) {
3787 compilation->set_has_reserved_stack_access(true);
3788 }
3789 if (callee->is_synchronized() || callee->has_monitor_bytecodes()) {
3790 compilation->set_has_monitors(true);
3791 }
3792 }
3793
3794 bool GraphBuilder::try_inline(ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc, Value receiver) {
3795 const char* msg = nullptr;
3796
3797 // clear out any existing inline bailout condition
3798 clear_inline_bailout();
3799
3800 // exclude methods we don't want to inline
3801 msg = should_not_inline(callee);
3802 if (msg != nullptr) {
3803 print_inlining(callee, msg, /*success*/ false);
3804 return false;
3805 }
3806
3807 // method handle invokes
3808 if (callee->is_method_handle_intrinsic()) {
3809 if (try_method_handle_inline(callee, ignore_return)) {
3810 set_flags_for_inlined_callee(compilation(), callee);
3811 return true;
3812 }
3813 return false;
3814 }
3815
3816 // handle intrinsics
3817 if (callee->intrinsic_id() != vmIntrinsics::_none &&
3818 callee->check_intrinsic_candidate()) {
3819 if (try_inline_intrinsics(callee, ignore_return)) {
3820 print_inlining(callee, "intrinsic");
3821 set_flags_for_inlined_callee(compilation(), callee);
3822 return true;
3823 }
3824 // try normal inlining
3825 }
3826
3827 // certain methods cannot be parsed at all
3828 msg = check_can_parse(callee);
3829 if (msg != nullptr) {
3830 print_inlining(callee, msg, /*success*/ false);
3831 return false;
3832 }
3833
3834 // If bytecode not set use the current one.
3835 if (bc == Bytecodes::_illegal) {
3836 bc = code();
3837 }
3838 if (try_inline_full(callee, holder_known, ignore_return, bc, receiver)) {
3839 set_flags_for_inlined_callee(compilation(), callee);
3840 return true;
3841 }
3842
3843 // Entire compilation could fail during try_inline_full call.
3844 // In that case printing inlining decision info is useless.
3845 if (!bailed_out())
3846 print_inlining(callee, _inline_bailout_msg, /*success*/ false);
3847
3848 return false;
3849 }
3850
3851
3852 const char* GraphBuilder::check_can_parse(ciMethod* callee) const {
3853 // Certain methods cannot be parsed at all:
3854 if ( callee->is_native()) return "native method";
3855 if ( callee->is_abstract()) return "abstract method";
3856 if (!callee->can_be_parsed()) return "cannot be parsed";
3857 return nullptr;
3858 }
3859
3860 // negative filter: should callee NOT be inlined? returns null, ok to inline, or rejection msg
3861 const char* GraphBuilder::should_not_inline(ciMethod* callee) const {
3862 if ( compilation()->directive()->should_not_inline(callee)) return "disallowed by CompileCommand";
3863 if ( callee->dont_inline()) return "don't inline by annotation";
3864 return nullptr;
3865 }
3866
3867 void GraphBuilder::build_graph_for_intrinsic(ciMethod* callee, bool ignore_return) {
3868 vmIntrinsics::ID id = callee->intrinsic_id();
3869 assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
3870
3871 // Some intrinsics need special IR nodes.
3872 switch(id) {
3873 case vmIntrinsics::_getReference : append_unsafe_get(callee, T_OBJECT, false); return;
3874 case vmIntrinsics::_getBoolean : append_unsafe_get(callee, T_BOOLEAN, false); return;
3875 case vmIntrinsics::_getByte : append_unsafe_get(callee, T_BYTE, false); return;
3876 case vmIntrinsics::_getShort : append_unsafe_get(callee, T_SHORT, false); return;
3877 case vmIntrinsics::_getChar : append_unsafe_get(callee, T_CHAR, false); return;
3878 case vmIntrinsics::_getInt : append_unsafe_get(callee, T_INT, false); return;
3879 case vmIntrinsics::_getLong : append_unsafe_get(callee, T_LONG, false); return;
3880 case vmIntrinsics::_getFloat : append_unsafe_get(callee, T_FLOAT, false); return;
3881 case vmIntrinsics::_getDouble : append_unsafe_get(callee, T_DOUBLE, false); return;
3882 case vmIntrinsics::_putReference : append_unsafe_put(callee, T_OBJECT, false); return;
3883 case vmIntrinsics::_putBoolean : append_unsafe_put(callee, T_BOOLEAN, false); return;
3884 case vmIntrinsics::_putByte : append_unsafe_put(callee, T_BYTE, false); return;
3885 case vmIntrinsics::_putShort : append_unsafe_put(callee, T_SHORT, false); return;
3886 case vmIntrinsics::_putChar : append_unsafe_put(callee, T_CHAR, false); return;
3887 case vmIntrinsics::_putInt : append_unsafe_put(callee, T_INT, false); return;
3888 case vmIntrinsics::_putLong : append_unsafe_put(callee, T_LONG, false); return;
3889 case vmIntrinsics::_putFloat : append_unsafe_put(callee, T_FLOAT, false); return;
3890 case vmIntrinsics::_putDouble : append_unsafe_put(callee, T_DOUBLE, false); return;
3891 case vmIntrinsics::_getShortUnaligned : append_unsafe_get(callee, T_SHORT, false); return;
3892 case vmIntrinsics::_getCharUnaligned : append_unsafe_get(callee, T_CHAR, false); return;
3893 case vmIntrinsics::_getIntUnaligned : append_unsafe_get(callee, T_INT, false); return;
3894 case vmIntrinsics::_getLongUnaligned : append_unsafe_get(callee, T_LONG, false); return;
3895 case vmIntrinsics::_putShortUnaligned : append_unsafe_put(callee, T_SHORT, false); return;
3896 case vmIntrinsics::_putCharUnaligned : append_unsafe_put(callee, T_CHAR, false); return;
3897 case vmIntrinsics::_putIntUnaligned : append_unsafe_put(callee, T_INT, false); return;
3898 case vmIntrinsics::_putLongUnaligned : append_unsafe_put(callee, T_LONG, false); return;
3899 case vmIntrinsics::_getReferenceVolatile : append_unsafe_get(callee, T_OBJECT, true); return;
3900 case vmIntrinsics::_getBooleanVolatile : append_unsafe_get(callee, T_BOOLEAN, true); return;
3901 case vmIntrinsics::_getByteVolatile : append_unsafe_get(callee, T_BYTE, true); return;
3902 case vmIntrinsics::_getShortVolatile : append_unsafe_get(callee, T_SHORT, true); return;
3903 case vmIntrinsics::_getCharVolatile : append_unsafe_get(callee, T_CHAR, true); return;
3904 case vmIntrinsics::_getIntVolatile : append_unsafe_get(callee, T_INT, true); return;
3905 case vmIntrinsics::_getLongVolatile : append_unsafe_get(callee, T_LONG, true); return;
3906 case vmIntrinsics::_getFloatVolatile : append_unsafe_get(callee, T_FLOAT, true); return;
3907 case vmIntrinsics::_getDoubleVolatile : append_unsafe_get(callee, T_DOUBLE, true); return;
3908 case vmIntrinsics::_putReferenceVolatile : append_unsafe_put(callee, T_OBJECT, true); return;
3909 case vmIntrinsics::_putBooleanVolatile : append_unsafe_put(callee, T_BOOLEAN, true); return;
3910 case vmIntrinsics::_putByteVolatile : append_unsafe_put(callee, T_BYTE, true); return;
3911 case vmIntrinsics::_putShortVolatile : append_unsafe_put(callee, T_SHORT, true); return;
3912 case vmIntrinsics::_putCharVolatile : append_unsafe_put(callee, T_CHAR, true); return;
3913 case vmIntrinsics::_putIntVolatile : append_unsafe_put(callee, T_INT, true); return;
3914 case vmIntrinsics::_putLongVolatile : append_unsafe_put(callee, T_LONG, true); return;
3915 case vmIntrinsics::_putFloatVolatile : append_unsafe_put(callee, T_FLOAT, true); return;
3916 case vmIntrinsics::_putDoubleVolatile : append_unsafe_put(callee, T_DOUBLE, true); return;
3917 case vmIntrinsics::_compareAndSetLong:
3918 case vmIntrinsics::_compareAndSetInt:
3919 case vmIntrinsics::_compareAndSetReference : append_unsafe_CAS(callee); return;
3920 case vmIntrinsics::_getAndAddInt:
3921 case vmIntrinsics::_getAndAddLong : append_unsafe_get_and_set(callee, true); return;
3922 case vmIntrinsics::_getAndSetInt :
3923 case vmIntrinsics::_getAndSetLong :
3924 case vmIntrinsics::_getAndSetReference : append_unsafe_get_and_set(callee, false); return;
3925 case vmIntrinsics::_getCharStringU : append_char_access(callee, false); return;
3926 case vmIntrinsics::_putCharStringU : append_char_access(callee, true); return;
3927 default:
3928 break;
3929 }
3930
3931 // create intrinsic node
3932 const bool has_receiver = !callee->is_static();
3933 ValueType* result_type = as_ValueType(callee->return_type());
3934 ValueStack* state_before = copy_state_for_exception();
3935
3936 Values* args = state()->pop_arguments(callee->arg_size());
3937
3938 if (is_profiling()) {
3939 // Don't profile in the special case where the root method
3940 // is the intrinsic
3941 if (callee != method()) {
3942 // Note that we'd collect profile data in this method if we wanted it.
3943 compilation()->set_would_profile(true);
3944 if (profile_calls()) {
3945 Value recv = nullptr;
3946 if (has_receiver) {
3947 recv = args->at(0);
3948 null_check(recv);
3949 }
3950 profile_call(callee, recv, nullptr, collect_args_for_profiling(args, callee, true), true);
3951 }
3952 }
3953 }
3954
3955 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(),
3956 args, has_receiver, state_before,
3957 vmIntrinsics::preserves_state(id),
3958 vmIntrinsics::can_trap(id));
3959 // append instruction & push result
3960 Value value = append_split(result);
3961 if (result_type != voidType && !ignore_return) {
3962 push(result_type, value);
3963 }
3964
3965 if (callee != method() && profile_return() && result_type->is_object_kind()) {
3966 profile_return_type(result, callee);
3967 }
3968 }
3969
3970 bool GraphBuilder::try_inline_intrinsics(ciMethod* callee, bool ignore_return) {
3971 // For calling is_intrinsic_available we need to transition to
3972 // the '_thread_in_vm' state because is_intrinsic_available()
3973 // accesses critical VM-internal data.
3974 bool is_available = false;
3975 {
3976 VM_ENTRY_MARK;
3977 methodHandle mh(THREAD, callee->get_Method());
3978 is_available = _compilation->compiler()->is_intrinsic_available(mh, _compilation->directive());
3979 }
3980
3981 if (!is_available) {
3982 if (!InlineNatives) {
3983 // Return false and also set message that the inlining of
3984 // intrinsics has been disabled in general.
3985 INLINE_BAILOUT("intrinsic method inlining disabled");
3986 } else {
3987 return false;
3988 }
3989 }
3990 build_graph_for_intrinsic(callee, ignore_return);
3991 return true;
3992 }
3993
3994
3995 bool GraphBuilder::try_inline_jsr(int jsr_dest_bci) {
3996 // Introduce a new callee continuation point - all Ret instructions
3997 // will be replaced with Gotos to this point.
3998 BlockBegin* cont = block_at(next_bci());
3999 assert(cont != nullptr, "continuation must exist (BlockListBuilder starts a new block after a jsr");
4000
4001 // Note: can not assign state to continuation yet, as we have to
4002 // pick up the state from the Ret instructions.
4003
4004 // Push callee scope
4005 push_scope_for_jsr(cont, jsr_dest_bci);
4006
4007 // Temporarily set up bytecode stream so we can append instructions
4008 // (only using the bci of this stream)
4009 scope_data()->set_stream(scope_data()->parent()->stream());
4010
4011 BlockBegin* jsr_start_block = block_at(jsr_dest_bci);
4012 assert(jsr_start_block != nullptr, "jsr start block must exist");
4013 assert(!jsr_start_block->is_set(BlockBegin::was_visited_flag), "should not have visited jsr yet");
4014 Goto* goto_sub = new Goto(jsr_start_block, false);
4015 // Must copy state to avoid wrong sharing when parsing bytecodes
4016 assert(jsr_start_block->state() == nullptr, "should have fresh jsr starting block");
4017 jsr_start_block->set_state(copy_state_before_with_bci(jsr_dest_bci));
4018 append(goto_sub);
4019 _block->set_end(goto_sub);
4020 _last = _block = jsr_start_block;
4021
4022 // Clear out bytecode stream
4023 scope_data()->set_stream(nullptr);
4024
4025 scope_data()->add_to_work_list(jsr_start_block);
4026
4027 // Ready to resume parsing in subroutine
4028 iterate_all_blocks();
4029
4030 // If we bailed out during parsing, return immediately (this is bad news)
4031 CHECK_BAILOUT_(false);
4032
4033 // Detect whether the continuation can actually be reached. If not,
4034 // it has not had state set by the join() operations in
4035 // iterate_bytecodes_for_block()/ret() and we should not touch the
4036 // iteration state. The calling activation of
4037 // iterate_bytecodes_for_block will then complete normally.
4038 if (cont->state() != nullptr) {
4039 if (!cont->is_set(BlockBegin::was_visited_flag)) {
4040 // add continuation to work list instead of parsing it immediately
4041 scope_data()->parent()->add_to_work_list(cont);
4042 }
4043 }
4044
4045 assert(jsr_continuation() == cont, "continuation must not have changed");
4046 assert(!jsr_continuation()->is_set(BlockBegin::was_visited_flag) ||
4047 jsr_continuation()->is_set(BlockBegin::parser_loop_header_flag),
4048 "continuation can only be visited in case of backward branches");
4049 assert(_last && _last->as_BlockEnd(), "block must have end");
4050
4051 // continuation is in work list, so end iteration of current block
4052 _skip_block = true;
4053 pop_scope_for_jsr();
4054
4055 return true;
4056 }
4057
4058
4059 // Inline the entry of a synchronized method as a monitor enter and
4060 // register the exception handler which releases the monitor if an
4061 // exception is thrown within the callee. Note that the monitor enter
4062 // cannot throw an exception itself, because the receiver is
4063 // guaranteed to be non-null by the explicit null check at the
4064 // beginning of inlining.
4065 void GraphBuilder::inline_sync_entry(Value lock, BlockBegin* sync_handler) {
4066 assert(lock != nullptr && sync_handler != nullptr, "lock or handler missing");
4067
4068 monitorenter(lock, SynchronizationEntryBCI);
4069 assert(_last->as_MonitorEnter() != nullptr, "monitor enter expected");
4070 _last->set_needs_null_check(false);
4071
4072 sync_handler->set(BlockBegin::exception_entry_flag);
4073 sync_handler->set(BlockBegin::is_on_work_list_flag);
4074
4075 ciExceptionHandler* desc = new ciExceptionHandler(method()->holder(), 0, method()->code_size(), -1, 0);
4076 XHandler* h = new XHandler(desc);
4077 h->set_entry_block(sync_handler);
4078 scope_data()->xhandlers()->append(h);
4079 scope_data()->set_has_handler();
4080 }
4081
4082
4083 // If an exception is thrown and not handled within an inlined
4084 // synchronized method, the monitor must be released before the
4085 // exception is rethrown in the outer scope. Generate the appropriate
4086 // instructions here.
4087 void GraphBuilder::fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler) {
4088 BlockBegin* orig_block = _block;
4089 ValueStack* orig_state = _state;
4090 Instruction* orig_last = _last;
4091 _last = _block = sync_handler;
4092 _state = sync_handler->state()->copy();
4093
4094 assert(sync_handler != nullptr, "handler missing");
4095 assert(!sync_handler->is_set(BlockBegin::was_visited_flag), "is visited here");
4096
4097 assert(lock != nullptr || default_handler, "lock or handler missing");
4098
4099 XHandler* h = scope_data()->xhandlers()->remove_last();
4100 assert(h->entry_block() == sync_handler, "corrupt list of handlers");
4101
4102 block()->set(BlockBegin::was_visited_flag);
4103 Value exception = append_with_bci(new ExceptionObject(), SynchronizationEntryBCI);
4104 assert(exception->is_pinned(), "must be");
4105
4106 int bci = SynchronizationEntryBCI;
4107 if (compilation()->env()->dtrace_method_probes()) {
4108 // Report exit from inline methods. We don't have a stream here
4109 // so pass an explicit bci of SynchronizationEntryBCI.
4110 Values* args = new Values(1);
4111 args->push(append_with_bci(new Constant(new MethodConstant(method())), bci));
4112 append_with_bci(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args), bci);
4113 }
4114
4115 if (lock) {
4116 assert(state()->locks_size() > 0 && state()->lock_at(state()->locks_size() - 1) == lock, "lock is missing");
4117 if (!lock->is_linked()) {
4118 lock = append_with_bci(lock, bci);
4119 }
4120
4121 // exit the monitor in the context of the synchronized method
4122 monitorexit(lock, bci);
4123
4124 // exit the context of the synchronized method
4125 if (!default_handler) {
4126 pop_scope();
4127 bci = _state->caller_state()->bci();
4128 _state = _state->caller_state()->copy_for_parsing();
4129 }
4130 }
4131
4132 // perform the throw as if at the call site
4133 apush(exception);
4134 throw_op(bci);
4135
4136 BlockEnd* end = last()->as_BlockEnd();
4137 block()->set_end(end);
4138
4139 _block = orig_block;
4140 _state = orig_state;
4141 _last = orig_last;
4142 }
4143
4144
4145 bool GraphBuilder::try_inline_full(ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc, Value receiver) {
4146 assert(!callee->is_native(), "callee must not be native");
4147 if (CompilationPolicy::should_not_inline(compilation()->env(), callee)) {
4148 INLINE_BAILOUT("inlining prohibited by policy");
4149 }
4150 // first perform tests of things it's not possible to inline
4151 if (callee->has_exception_handlers() &&
4152 !InlineMethodsWithExceptionHandlers) INLINE_BAILOUT("callee has exception handlers");
4153 if (callee->is_synchronized() &&
4154 !InlineSynchronizedMethods ) INLINE_BAILOUT("callee is synchronized");
4155 if (!callee->holder()->is_linked()) INLINE_BAILOUT("callee's klass not linked yet");
4156 if (bc == Bytecodes::_invokestatic &&
4157 !callee->holder()->is_initialized()) INLINE_BAILOUT("callee's klass not initialized yet");
4158 if (!callee->has_balanced_monitors()) INLINE_BAILOUT("callee's monitors do not match");
4159
4160 // Proper inlining of methods with jsrs requires a little more work.
4161 if (callee->has_jsrs() ) INLINE_BAILOUT("jsrs not handled properly by inliner yet");
4162
4163 if (is_profiling() && !callee->ensure_method_data()) {
4164 INLINE_BAILOUT("mdo allocation failed");
4165 }
4166
4167 const bool is_invokedynamic = (bc == Bytecodes::_invokedynamic);
4168 const bool has_receiver = (bc != Bytecodes::_invokestatic && !is_invokedynamic);
4169
4170 const int args_base = state()->stack_size() - callee->arg_size();
4171 assert(args_base >= 0, "stack underflow during inlining");
4172
4173 Value recv = nullptr;
4174 if (has_receiver) {
4175 assert(!callee->is_static(), "callee must not be static");
4176 assert(callee->arg_size() > 0, "must have at least a receiver");
4177
4178 recv = state()->stack_at(args_base);
4179 if (recv->is_null_obj()) {
4180 INLINE_BAILOUT("receiver is always null");
4181 }
4182 }
4183
4184 // now perform tests that are based on flag settings
4185 bool inlinee_by_directive = compilation()->directive()->should_inline(callee);
4186 if (callee->force_inline() || inlinee_by_directive) {
4187 if (inline_level() > MaxForceInlineLevel ) INLINE_BAILOUT("MaxForceInlineLevel");
4188 if (recursive_inline_level(callee) > C1MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep");
4189
4190 const char* msg = "";
4191 if (callee->force_inline()) msg = "force inline by annotation";
4192 if (inlinee_by_directive) msg = "force inline by CompileCommand";
4193 print_inlining(callee, msg);
4194 } else {
4195 // use heuristic controls on inlining
4196 if (inline_level() > C1MaxInlineLevel ) INLINE_BAILOUT("inlining too deep");
4197 int callee_recursive_level = recursive_inline_level(callee);
4198 if (callee_recursive_level > C1MaxRecursiveInlineLevel ) INLINE_BAILOUT("recursive inlining too deep");
4199 if (callee->code_size_for_inlining() > max_inline_size() ) INLINE_BAILOUT("callee is too large");
4200 // Additional condition to limit stack usage for non-recursive calls.
4201 if ((callee_recursive_level == 0) &&
4202 (callee->max_stack() + callee->max_locals() - callee->size_of_parameters() > C1InlineStackLimit)) {
4203 INLINE_BAILOUT("callee uses too much stack");
4204 }
4205
4206 // don't inline throwable methods unless the inlining tree is rooted in a throwable class
4207 if (callee->name() == ciSymbols::object_initializer_name() &&
4208 callee->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
4209 // Throwable constructor call
4210 IRScope* top = scope();
4211 while (top->caller() != nullptr) {
4212 top = top->caller();
4213 }
4214 if (!top->method()->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
4215 INLINE_BAILOUT("don't inline Throwable constructors");
4216 }
4217 }
4218
4219 if (compilation()->env()->num_inlined_bytecodes() > DesiredMethodLimit) {
4220 INLINE_BAILOUT("total inlining greater than DesiredMethodLimit");
4221 }
4222 // printing
4223 print_inlining(callee, "inline", /*success*/ true);
4224 }
4225
4226 assert(bc != Bytecodes::_invokestatic || callee->holder()->is_initialized(), "required");
4227
4228 // NOTE: Bailouts from this point on, which occur at the
4229 // GraphBuilder level, do not cause bailout just of the inlining but
4230 // in fact of the entire compilation.
4231
4232 BlockBegin* orig_block = block();
4233
4234 // Insert null check if necessary
4235 if (has_receiver) {
4236 // note: null check must happen even if first instruction of callee does
4237 // an implicit null check since the callee is in a different scope
4238 // and we must make sure exception handling does the right thing
4239 null_check(recv);
4240 }
4241
4242 if (is_profiling()) {
4243 // Note that we'd collect profile data in this method if we wanted it.
4244 // this may be redundant here...
4245 compilation()->set_would_profile(true);
4246
4247 if (profile_calls()) {
4248 int start = 0;
4249 Values* obj_args = args_list_for_profiling(callee, start, has_receiver);
4250 if (obj_args != nullptr) {
4251 int s = obj_args->capacity();
4252 // if called through method handle invoke, some arguments may have been popped
4253 for (int i = args_base+start, j = 0; j < obj_args->capacity() && i < state()->stack_size(); ) {
4254 Value v = state()->stack_at_inc(i);
4255 if (v->type()->is_object_kind()) {
4256 obj_args->push(v);
4257 j++;
4258 }
4259 }
4260 check_args_for_profiling(obj_args, s);
4261 }
4262 profile_call(callee, recv, holder_known ? callee->holder() : nullptr, obj_args, true);
4263 }
4264 }
4265
4266 // Introduce a new callee continuation point - if the callee has
4267 // more than one return instruction or the return does not allow
4268 // fall-through of control flow, all return instructions of the
4269 // callee will need to be replaced by Goto's pointing to this
4270 // continuation point.
4271 BlockBegin* cont = block_at(next_bci());
4272 bool continuation_existed = true;
4273 if (cont == nullptr) {
4274 cont = new BlockBegin(next_bci());
4275 // low number so that continuation gets parsed as early as possible
4276 cont->set_depth_first_number(0);
4277 if (PrintInitialBlockList) {
4278 tty->print_cr("CFG: created block %d (bci %d) as continuation for inline at bci %d",
4279 cont->block_id(), cont->bci(), bci());
4280 }
4281 continuation_existed = false;
4282 }
4283 // Record number of predecessors of continuation block before
4284 // inlining, to detect if inlined method has edges to its
4285 // continuation after inlining.
4286 int continuation_preds = cont->number_of_preds();
4287
4288 // Push callee scope
4289 push_scope(callee, cont);
4290
4291 // the BlockListBuilder for the callee could have bailed out
4292 if (bailed_out())
4293 return false;
4294
4295 // Temporarily set up bytecode stream so we can append instructions
4296 // (only using the bci of this stream)
4297 scope_data()->set_stream(scope_data()->parent()->stream());
4298
4299 // Pass parameters into callee state: add assignments
4300 // note: this will also ensure that all arguments are computed before being passed
4301 ValueStack* callee_state = state();
4302 ValueStack* caller_state = state()->caller_state();
4303 for (int i = args_base; i < caller_state->stack_size(); ) {
4304 const int arg_no = i - args_base;
4305 Value arg = caller_state->stack_at_inc(i);
4306 store_local(callee_state, arg, arg_no);
4307 }
4308
4309 // Remove args from stack.
4310 // Note that we preserve locals state in case we can use it later
4311 // (see use of pop_scope() below)
4312 caller_state->truncate_stack(args_base);
4313 assert(callee_state->stack_size() == 0, "callee stack must be empty");
4314
4315 Value lock = nullptr;
4316 BlockBegin* sync_handler = nullptr;
4317
4318 // Inline the locking of the receiver if the callee is synchronized
4319 if (callee->is_synchronized()) {
4320 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror())))
4321 : state()->local_at(0);
4322 sync_handler = new BlockBegin(SynchronizationEntryBCI);
4323 inline_sync_entry(lock, sync_handler);
4324 }
4325
4326 if (compilation()->env()->dtrace_method_probes()) {
4327 Values* args = new Values(1);
4328 args->push(append(new Constant(new MethodConstant(method()))));
4329 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args));
4330 }
4331
4332 if (profile_inlined_calls()) {
4333 profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI));
4334 }
4335
4336 BlockBegin* callee_start_block = block_at(0);
4337 if (callee_start_block != nullptr) {
4338 assert(callee_start_block->is_set(BlockBegin::parser_loop_header_flag), "must be loop header");
4339 Goto* goto_callee = new Goto(callee_start_block, false);
4340 // The state for this goto is in the scope of the callee, so use
4341 // the entry bci for the callee instead of the call site bci.
4342 append_with_bci(goto_callee, 0);
4343 _block->set_end(goto_callee);
4344 callee_start_block->merge(callee_state, compilation()->has_irreducible_loops());
4345
4346 _last = _block = callee_start_block;
4347
4348 scope_data()->add_to_work_list(callee_start_block);
4349 }
4350
4351 // Clear out bytecode stream
4352 scope_data()->set_stream(nullptr);
4353 scope_data()->set_ignore_return(ignore_return);
4354
4355 CompileLog* log = compilation()->log();
4356 if (log != nullptr) log->head("parse method='%d'", log->identify(callee));
4357
4358 // Ready to resume parsing in callee (either in the same block we
4359 // were in before or in the callee's start block)
4360 iterate_all_blocks(callee_start_block == nullptr);
4361
4362 if (log != nullptr) log->done("parse");
4363
4364 // If we bailed out during parsing, return immediately (this is bad news)
4365 if (bailed_out())
4366 return false;
4367
4368 // iterate_all_blocks theoretically traverses in random order; in
4369 // practice, we have only traversed the continuation if we are
4370 // inlining into a subroutine
4371 assert(continuation_existed ||
4372 !continuation()->is_set(BlockBegin::was_visited_flag),
4373 "continuation should not have been parsed yet if we created it");
4374
4375 // At this point we are almost ready to return and resume parsing of
4376 // the caller back in the GraphBuilder. The only thing we want to do
4377 // first is an optimization: during parsing of the callee we
4378 // generated at least one Goto to the continuation block. If we
4379 // generated exactly one, and if the inlined method spanned exactly
4380 // one block (and we didn't have to Goto its entry), then we snip
4381 // off the Goto to the continuation, allowing control to fall
4382 // through back into the caller block and effectively performing
4383 // block merging. This allows load elimination and CSE to take place
4384 // across multiple callee scopes if they are relatively simple, and
4385 // is currently essential to making inlining profitable.
4386 if (num_returns() == 1
4387 && block() == orig_block
4388 && block() == inline_cleanup_block()) {
4389 _last = inline_cleanup_return_prev();
4390 _state = inline_cleanup_state();
4391 } else if (continuation_preds == cont->number_of_preds()) {
4392 // Inlining caused that the instructions after the invoke in the
4393 // caller are not reachable any more. So skip filling this block
4394 // with instructions!
4395 assert(cont == continuation(), "");
4396 assert(_last && _last->as_BlockEnd(), "");
4397 _skip_block = true;
4398 } else {
4399 // Resume parsing in continuation block unless it was already parsed.
4400 // Note that if we don't change _last here, iteration in
4401 // iterate_bytecodes_for_block will stop when we return.
4402 if (!continuation()->is_set(BlockBegin::was_visited_flag)) {
4403 // add continuation to work list instead of parsing it immediately
4404 assert(_last && _last->as_BlockEnd(), "");
4405 scope_data()->parent()->add_to_work_list(continuation());
4406 _skip_block = true;
4407 }
4408 }
4409
4410 // Fill the exception handler for synchronized methods with instructions
4411 if (callee->is_synchronized() && sync_handler->state() != nullptr) {
4412 fill_sync_handler(lock, sync_handler);
4413 } else {
4414 pop_scope();
4415 }
4416
4417 compilation()->notice_inlined_method(callee);
4418
4419 return true;
4420 }
4421
4422
4423 bool GraphBuilder::try_method_handle_inline(ciMethod* callee, bool ignore_return) {
4424 ValueStack* state_before = copy_state_before();
4425 vmIntrinsics::ID iid = callee->intrinsic_id();
4426 switch (iid) {
4427 case vmIntrinsics::_invokeBasic:
4428 {
4429 // get MethodHandle receiver
4430 const int args_base = state()->stack_size() - callee->arg_size();
4431 ValueType* type = state()->stack_at(args_base)->type();
4432 if (type->is_constant()) {
4433 ciObject* mh = type->as_ObjectType()->constant_value();
4434 if (mh->is_method_handle()) {
4435 ciMethod* target = mh->as_method_handle()->get_vmtarget();
4436
4437 // We don't do CHA here so only inline static and statically bindable methods.
4438 if (target->is_static() || target->can_be_statically_bound()) {
4439 if (ciMethod::is_consistent_info(callee, target)) {
4440 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual;
4441 ignore_return = ignore_return || (callee->return_type()->is_void() && !target->return_type()->is_void());
4442 if (try_inline(target, /*holder_known*/ !callee->is_static(), ignore_return, bc)) {
4443 return true;
4444 }
4445 } else {
4446 print_inlining(target, "signatures mismatch", /*success*/ false);
4447 }
4448 } else {
4449 assert(false, "no inlining through MH::invokeBasic"); // missing optimization opportunity due to suboptimal LF shape
4450 print_inlining(target, "not static or statically bindable", /*success*/ false);
4451 }
4452 } else {
4453 assert(mh->is_null_object(), "not a null");
4454 print_inlining(callee, "receiver is always null", /*success*/ false);
4455 }
4456 } else {
4457 print_inlining(callee, "receiver not constant", /*success*/ false);
4458 }
4459 }
4460 break;
4461
4462 case vmIntrinsics::_linkToVirtual:
4463 case vmIntrinsics::_linkToStatic:
4464 case vmIntrinsics::_linkToSpecial:
4465 case vmIntrinsics::_linkToInterface:
4466 {
4467 // pop MemberName argument
4468 const int args_base = state()->stack_size() - callee->arg_size();
4469 ValueType* type = apop()->type();
4470 if (type->is_constant()) {
4471 ciMethod* target = type->as_ObjectType()->constant_value()->as_member_name()->get_vmtarget();
4472 ignore_return = ignore_return || (callee->return_type()->is_void() && !target->return_type()->is_void());
4473 // If the target is another method handle invoke, try to recursively get
4474 // a better target.
4475 if (target->is_method_handle_intrinsic()) {
4476 if (try_method_handle_inline(target, ignore_return)) {
4477 return true;
4478 }
4479 } else if (!ciMethod::is_consistent_info(callee, target)) {
4480 print_inlining(target, "signatures mismatch", /*success*/ false);
4481 } else {
4482 ciSignature* signature = target->signature();
4483 const int receiver_skip = target->is_static() ? 0 : 1;
4484 // Cast receiver to its type.
4485 if (!target->is_static()) {
4486 ciKlass* tk = signature->accessing_klass();
4487 Value obj = state()->stack_at(args_base);
4488 if (obj->exact_type() == nullptr &&
4489 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) {
4490 TypeCast* c = new TypeCast(tk, obj, state_before);
4491 append(c);
4492 state()->stack_at_put(args_base, c);
4493 }
4494 }
4495 // Cast reference arguments to its type.
4496 for (int i = 0, j = 0; i < signature->count(); i++) {
4497 ciType* t = signature->type_at(i);
4498 if (t->is_klass()) {
4499 ciKlass* tk = t->as_klass();
4500 Value obj = state()->stack_at(args_base + receiver_skip + j);
4501 if (obj->exact_type() == nullptr &&
4502 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) {
4503 TypeCast* c = new TypeCast(t, obj, state_before);
4504 append(c);
4505 state()->stack_at_put(args_base + receiver_skip + j, c);
4506 }
4507 }
4508 j += t->size(); // long and double take two slots
4509 }
4510 // We don't do CHA here so only inline static and statically bindable methods.
4511 if (target->is_static() || target->can_be_statically_bound()) {
4512 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual;
4513 if (try_inline(target, /*holder_known*/ !callee->is_static(), ignore_return, bc)) {
4514 return true;
4515 }
4516 } else {
4517 print_inlining(target, "not static or statically bindable", /*success*/ false);
4518 }
4519 }
4520 } else {
4521 print_inlining(callee, "MemberName not constant", /*success*/ false);
4522 }
4523 }
4524 break;
4525
4526 case vmIntrinsics::_linkToNative:
4527 print_inlining(callee, "native call", /*success*/ false);
4528 break;
4529
4530 default:
4531 fatal("unexpected intrinsic %d: %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
4532 break;
4533 }
4534 set_state(state_before->copy_for_parsing());
4535 return false;
4536 }
4537
4538
4539 void GraphBuilder::inline_bailout(const char* msg) {
4540 assert(msg != nullptr, "inline bailout msg must exist");
4541 _inline_bailout_msg = msg;
4542 }
4543
4544
4545 void GraphBuilder::clear_inline_bailout() {
4546 _inline_bailout_msg = nullptr;
4547 }
4548
4549
4550 void GraphBuilder::push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start) {
4551 ScopeData* data = new ScopeData(nullptr);
4552 data->set_scope(scope);
4553 data->set_bci2block(bci2block);
4554 _scope_data = data;
4555 _block = start;
4556 }
4557
4558
4559 void GraphBuilder::push_scope(ciMethod* callee, BlockBegin* continuation) {
4560 IRScope* callee_scope = new IRScope(compilation(), scope(), bci(), callee, -1, false);
4561 scope()->add_callee(callee_scope);
4562
4563 BlockListBuilder blb(compilation(), callee_scope, -1);
4564 CHECK_BAILOUT();
4565
4566 if (!blb.bci2block()->at(0)->is_set(BlockBegin::parser_loop_header_flag)) {
4567 // this scope can be inlined directly into the caller so remove
4568 // the block at bci 0.
4569 blb.bci2block()->at_put(0, nullptr);
4570 }
4571
4572 set_state(new ValueStack(callee_scope, state()->copy(ValueStack::CallerState, bci())));
4573
4574 ScopeData* data = new ScopeData(scope_data());
4575 data->set_scope(callee_scope);
4576 data->set_bci2block(blb.bci2block());
4577 data->set_continuation(continuation);
4578 _scope_data = data;
4579 }
4580
4581
4582 void GraphBuilder::push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci) {
4583 ScopeData* data = new ScopeData(scope_data());
4584 data->set_parsing_jsr();
4585 data->set_jsr_entry_bci(jsr_dest_bci);
4586 data->set_jsr_return_address_local(-1);
4587 // Must clone bci2block list as we will be mutating it in order to
4588 // properly clone all blocks in jsr region as well as exception
4589 // handlers containing rets
4590 BlockList* new_bci2block = new BlockList(bci2block()->length());
4591 new_bci2block->appendAll(bci2block());
4592 data->set_bci2block(new_bci2block);
4593 data->set_scope(scope());
4594 data->setup_jsr_xhandlers();
4595 data->set_continuation(continuation());
4596 data->set_jsr_continuation(jsr_continuation);
4597 _scope_data = data;
4598 }
4599
4600
4601 void GraphBuilder::pop_scope() {
4602 int number_of_locks = scope()->number_of_locks();
4603 _scope_data = scope_data()->parent();
4604 // accumulate minimum number of monitor slots to be reserved
4605 scope()->set_min_number_of_locks(number_of_locks);
4606 }
4607
4608
4609 void GraphBuilder::pop_scope_for_jsr() {
4610 _scope_data = scope_data()->parent();
4611 }
4612
4613 void GraphBuilder::append_unsafe_get(ciMethod* callee, BasicType t, bool is_volatile) {
4614 Values* args = state()->pop_arguments(callee->arg_size());
4615 null_check(args->at(0));
4616 Instruction* offset = args->at(2);
4617 #ifndef _LP64
4618 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4619 #endif
4620 Instruction* op = append(new UnsafeGet(t, args->at(1), offset, is_volatile));
4621 push(op->type(), op);
4622 compilation()->set_has_unsafe_access(true);
4623 }
4624
4625
4626 void GraphBuilder::append_unsafe_put(ciMethod* callee, BasicType t, bool is_volatile) {
4627 Values* args = state()->pop_arguments(callee->arg_size());
4628 null_check(args->at(0));
4629 Instruction* offset = args->at(2);
4630 #ifndef _LP64
4631 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4632 #endif
4633 Value val = args->at(3);
4634 if (t == T_BOOLEAN) {
4635 Value mask = append(new Constant(new IntConstant(1)));
4636 val = append(new LogicOp(Bytecodes::_iand, val, mask));
4637 }
4638 Instruction* op = append(new UnsafePut(t, args->at(1), offset, val, is_volatile));
4639 compilation()->set_has_unsafe_access(true);
4640 kill_all();
4641 }
4642
4643 void GraphBuilder::append_unsafe_CAS(ciMethod* callee) {
4644 ValueStack* state_before = copy_state_for_exception();
4645 ValueType* result_type = as_ValueType(callee->return_type());
4646 assert(result_type->is_int(), "int result");
4647 Values* args = state()->pop_arguments(callee->arg_size());
4648
4649 // Pop off some args to specially handle, then push back
4650 Value newval = args->pop();
4651 Value cmpval = args->pop();
4652 Value offset = args->pop();
4653 Value src = args->pop();
4654 Value unsafe_obj = args->pop();
4655
4656 // Separately handle the unsafe arg. It is not needed for code
4657 // generation, but must be null checked
4658 null_check(unsafe_obj);
4659
4660 #ifndef _LP64
4661 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4662 #endif
4663
4664 args->push(src);
4665 args->push(offset);
4666 args->push(cmpval);
4667 args->push(newval);
4668
4669 // An unsafe CAS can alias with other field accesses, but we don't
4670 // know which ones so mark the state as no preserved. This will
4671 // cause CSE to invalidate memory across it.
4672 bool preserves_state = false;
4673 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), args, false, state_before, preserves_state);
4674 append_split(result);
4675 push(result_type, result);
4676 compilation()->set_has_unsafe_access(true);
4677 }
4678
4679 void GraphBuilder::append_char_access(ciMethod* callee, bool is_store) {
4680 // This intrinsic accesses byte[] array as char[] array. Computing the offsets
4681 // correctly requires matched array shapes.
4682 assert (arrayOopDesc::base_offset_in_bytes(T_CHAR) == arrayOopDesc::base_offset_in_bytes(T_BYTE),
4683 "sanity: byte[] and char[] bases agree");
4684 assert (type2aelembytes(T_CHAR) == type2aelembytes(T_BYTE)*2,
4685 "sanity: byte[] and char[] scales agree");
4686
4687 ValueStack* state_before = copy_state_indexed_access();
4688 compilation()->set_has_access_indexed(true);
4689 Values* args = state()->pop_arguments(callee->arg_size());
4690 Value array = args->at(0);
4691 Value index = args->at(1);
4692 if (is_store) {
4693 Value value = args->at(2);
4694 Instruction* store = append(new StoreIndexed(array, index, nullptr, T_CHAR, value, state_before, false, true));
4695 store->set_flag(Instruction::NeedsRangeCheckFlag, false);
4696 _memory->store_value(value);
4697 } else {
4698 Instruction* load = append(new LoadIndexed(array, index, nullptr, T_CHAR, state_before, true));
4699 load->set_flag(Instruction::NeedsRangeCheckFlag, false);
4700 push(load->type(), load);
4701 }
4702 }
4703
4704 void GraphBuilder::print_inlining(ciMethod* callee, const char* msg, bool success) {
4705 CompileLog* log = compilation()->log();
4706 if (log != nullptr) {
4707 assert(msg != nullptr, "inlining msg should not be null!");
4708 if (success) {
4709 log->inline_success(msg);
4710 } else {
4711 log->inline_fail(msg);
4712 }
4713 }
4714 EventCompilerInlining event;
4715 if (event.should_commit()) {
4716 CompilerEvent::InlineEvent::post(event, compilation()->env()->task()->compile_id(), method()->get_Method(), callee, success, msg, bci());
4717 }
4718
4719 CompileTask::print_inlining_ul(callee, scope()->level(), bci(), inlining_result_of(success), msg);
4720
4721 if (!compilation()->directive()->PrintInliningOption) {
4722 return;
4723 }
4724 CompileTask::print_inlining_tty(callee, scope()->level(), bci(), inlining_result_of(success), msg);
4725 if (success && CIPrintMethodCodes) {
4726 callee->print_codes();
4727 }
4728 }
4729
4730 void GraphBuilder::append_unsafe_get_and_set(ciMethod* callee, bool is_add) {
4731 Values* args = state()->pop_arguments(callee->arg_size());
4732 BasicType t = callee->return_type()->basic_type();
4733 null_check(args->at(0));
4734 Instruction* offset = args->at(2);
4735 #ifndef _LP64
4736 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4737 #endif
4738 Instruction* op = append(new UnsafeGetAndSet(t, args->at(1), offset, args->at(3), is_add));
4739 compilation()->set_has_unsafe_access(true);
4740 kill_all();
4741 push(op->type(), op);
4742 }
4743
4744 #ifndef PRODUCT
4745 void GraphBuilder::print_stats() {
4746 if (UseLocalValueNumbering) {
4747 vmap()->print();
4748 }
4749 }
4750 #endif // PRODUCT
4751
4752 void GraphBuilder::profile_call(ciMethod* callee, Value recv, ciKlass* known_holder, Values* obj_args, bool inlined) {
4753 assert(known_holder == nullptr || (known_holder->is_instance_klass() &&
4754 (!known_holder->is_interface() ||
4755 ((ciInstanceKlass*)known_holder)->has_nonstatic_concrete_methods())), "should be non-static concrete method");
4756 if (known_holder != nullptr) {
4757 if (known_holder->exact_klass() == nullptr) {
4758 known_holder = compilation()->cha_exact_type(known_holder);
4759 }
4760 }
4761
4762 append(new ProfileCall(method(), bci(), callee, recv, known_holder, obj_args, inlined));
4763 }
4764
4765 void GraphBuilder::profile_return_type(Value ret, ciMethod* callee, ciMethod* m, int invoke_bci) {
4766 assert((m == nullptr) == (invoke_bci < 0), "invalid method and invalid bci together");
4767 if (m == nullptr) {
4768 m = method();
4769 }
4770 if (invoke_bci < 0) {
4771 invoke_bci = bci();
4772 }
4773 ciMethodData* md = m->method_data_or_null();
4774 ciProfileData* data = md->bci_to_data(invoke_bci);
4775 if (data != nullptr && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) {
4776 bool has_return = data->is_CallTypeData() ? ((ciCallTypeData*)data)->has_return() : ((ciVirtualCallTypeData*)data)->has_return();
4777 if (has_return) {
4778 append(new ProfileReturnType(m , invoke_bci, callee, ret));
4779 }
4780 }
4781 }
4782
4783 void GraphBuilder::profile_invocation(ciMethod* callee, ValueStack* state) {
4784 append(new ProfileInvoke(callee, state));
4785 }