1 /*
2 * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "c1/c1_CFGPrinter.hpp"
27 #include "c1/c1_Canonicalizer.hpp"
28 #include "c1/c1_Compilation.hpp"
29 #include "c1/c1_GraphBuilder.hpp"
30 #include "c1/c1_InstructionPrinter.hpp"
31 #include "ci/ciCallSite.hpp"
32 #include "ci/ciField.hpp"
33 #include "ci/ciFlatArrayKlass.hpp"
34 #include "ci/ciInlineKlass.hpp"
35 #include "ci/ciKlass.hpp"
36 #include "ci/ciMemberName.hpp"
37 #include "ci/ciSymbols.hpp"
38 #include "ci/ciUtilities.inline.hpp"
39 #include "classfile/javaClasses.hpp"
40 #include "compiler/compilationPolicy.hpp"
41 #include "compiler/compileBroker.hpp"
42 #include "compiler/compilerEvent.hpp"
43 #include "interpreter/bytecode.hpp"
44 #include "jfr/jfrEvents.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "runtime/sharedRuntime.hpp"
48 #include "runtime/vm_version.hpp"
49 #include "utilities/bitMap.inline.hpp"
50 #include "utilities/powerOfTwo.hpp"
51 #include "utilities/macros.hpp"
52 #if INCLUDE_JFR
53 #include "jfr/jfr.hpp"
54 #endif
55
56 class BlockListBuilder {
57 private:
58 Compilation* _compilation;
59 IRScope* _scope;
60
61 BlockList _blocks; // internal list of all blocks
62 BlockList* _bci2block; // mapping from bci to blocks for GraphBuilder
63 GrowableArray<BlockList> _bci2block_successors; // Mapping bcis to their blocks successors while we dont have a blockend
64
65 // fields used by mark_loops
66 ResourceBitMap _active; // for iteration of control flow graph
67 ResourceBitMap _visited; // for iteration of control flow graph
68 GrowableArray<ResourceBitMap> _loop_map; // caches the information if a block is contained in a loop
69 int _next_loop_index; // next free loop number
70 int _next_block_number; // for reverse postorder numbering of blocks
71 int _block_id_start;
72
73 int bit_number(int block_id) const { return block_id - _block_id_start; }
74 // accessors
75 Compilation* compilation() const { return _compilation; }
76 IRScope* scope() const { return _scope; }
77 ciMethod* method() const { return scope()->method(); }
78 XHandlers* xhandlers() const { return scope()->xhandlers(); }
79
80 // unified bailout support
81 void bailout(const char* msg) const { compilation()->bailout(msg); }
82 bool bailed_out() const { return compilation()->bailed_out(); }
83
84 // helper functions
85 BlockBegin* make_block_at(int bci, BlockBegin* predecessor);
86 void handle_exceptions(BlockBegin* current, int cur_bci);
87 void handle_jsr(BlockBegin* current, int sr_bci, int next_bci);
88 void store_one(BlockBegin* current, int local);
89 void store_two(BlockBegin* current, int local);
90 void set_entries(int osr_bci);
91 void set_leaders();
92
93 void make_loop_header(BlockBegin* block);
94 void mark_loops();
95 BitMap& mark_loops(BlockBegin* b, bool in_subroutine);
96
97 // debugging
98 #ifndef PRODUCT
99 void print();
100 #endif
101
102 int number_of_successors(BlockBegin* block);
103 BlockBegin* successor_at(BlockBegin* block, int i);
104 void add_successor(BlockBegin* block, BlockBegin* sux);
105 bool is_successor(BlockBegin* block, BlockBegin* sux);
106
107 public:
108 // creation
109 BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci);
110
111 // accessors for GraphBuilder
112 BlockList* bci2block() const { return _bci2block; }
113 };
114
115
116 // Implementation of BlockListBuilder
117
118 BlockListBuilder::BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci)
119 : _compilation(compilation)
120 , _scope(scope)
121 , _blocks(16)
122 , _bci2block(new BlockList(scope->method()->code_size(), nullptr))
123 , _bci2block_successors(scope->method()->code_size())
124 , _active() // size not known yet
125 , _visited() // size not known yet
126 , _loop_map() // size not known yet
127 , _next_loop_index(0)
128 , _next_block_number(0)
129 , _block_id_start(0)
130 {
131 set_entries(osr_bci);
132 set_leaders();
133 CHECK_BAILOUT();
134
135 mark_loops();
136 NOT_PRODUCT(if (PrintInitialBlockList) print());
137
138 // _bci2block still contains blocks with _end == null and > 0 sux in _bci2block_successors.
139
140 #ifndef PRODUCT
141 if (PrintCFGToFile) {
142 stringStream title;
143 title.print("BlockListBuilder ");
144 scope->method()->print_name(&title);
145 CFGPrinter::print_cfg(_bci2block, title.freeze(), false, false);
146 }
147 #endif
148 }
149
150
151 void BlockListBuilder::set_entries(int osr_bci) {
152 // generate start blocks
153 BlockBegin* std_entry = make_block_at(0, nullptr);
154 if (scope()->caller() == nullptr) {
155 std_entry->set(BlockBegin::std_entry_flag);
156 }
157 if (osr_bci != -1) {
158 BlockBegin* osr_entry = make_block_at(osr_bci, nullptr);
159 osr_entry->set(BlockBegin::osr_entry_flag);
160 }
161
162 // generate exception entry blocks
163 XHandlers* list = xhandlers();
164 const int n = list->length();
165 for (int i = 0; i < n; i++) {
166 XHandler* h = list->handler_at(i);
167 BlockBegin* entry = make_block_at(h->handler_bci(), nullptr);
168 entry->set(BlockBegin::exception_entry_flag);
169 h->set_entry_block(entry);
170 }
171 }
172
173
174 BlockBegin* BlockListBuilder::make_block_at(int cur_bci, BlockBegin* predecessor) {
175 assert(method()->bci_block_start().at(cur_bci), "wrong block starts of MethodLivenessAnalyzer");
176
177 BlockBegin* block = _bci2block->at(cur_bci);
178 if (block == nullptr) {
179 block = new BlockBegin(cur_bci);
180 block->init_stores_to_locals(method()->max_locals());
181 _bci2block->at_put(cur_bci, block);
182 _bci2block_successors.at_put_grow(cur_bci, BlockList());
183 _blocks.append(block);
184
185 assert(predecessor == nullptr || predecessor->bci() < cur_bci, "targets for backward branches must already exist");
186 }
187
188 if (predecessor != nullptr) {
189 if (block->is_set(BlockBegin::exception_entry_flag)) {
190 BAILOUT_("Exception handler can be reached by both normal and exceptional control flow", block);
191 }
192
193 add_successor(predecessor, block);
194 block->increment_total_preds();
195 }
196
197 return block;
198 }
199
200
201 inline void BlockListBuilder::store_one(BlockBegin* current, int local) {
202 current->stores_to_locals().set_bit(local);
203 }
204 inline void BlockListBuilder::store_two(BlockBegin* current, int local) {
205 store_one(current, local);
206 store_one(current, local + 1);
207 }
208
209
210 void BlockListBuilder::handle_exceptions(BlockBegin* current, int cur_bci) {
211 // Draws edges from a block to its exception handlers
212 XHandlers* list = xhandlers();
213 const int n = list->length();
214
215 for (int i = 0; i < n; i++) {
216 XHandler* h = list->handler_at(i);
217
218 if (h->covers(cur_bci)) {
219 BlockBegin* entry = h->entry_block();
220 assert(entry != nullptr && entry == _bci2block->at(h->handler_bci()), "entry must be set");
221 assert(entry->is_set(BlockBegin::exception_entry_flag), "flag must be set");
222
223 // add each exception handler only once
224 if(!is_successor(current, entry)) {
225 add_successor(current, entry);
226 entry->increment_total_preds();
227 }
228
229 // stop when reaching catchall
230 if (h->catch_type() == 0) break;
231 }
232 }
233 }
234
235 void BlockListBuilder::handle_jsr(BlockBegin* current, int sr_bci, int next_bci) {
236 if (next_bci < method()->code_size()) {
237 // start a new block after jsr-bytecode and link this block into cfg
238 make_block_at(next_bci, current);
239 }
240
241 // start a new block at the subroutine entry at mark it with special flag
242 BlockBegin* sr_block = make_block_at(sr_bci, current);
243 if (!sr_block->is_set(BlockBegin::subroutine_entry_flag)) {
244 sr_block->set(BlockBegin::subroutine_entry_flag);
245 }
246 }
247
248
249 void BlockListBuilder::set_leaders() {
250 bool has_xhandlers = xhandlers()->has_handlers();
251 BlockBegin* current = nullptr;
252
253 // The information which bci starts a new block simplifies the analysis
254 // Without it, backward branches could jump to a bci where no block was created
255 // during bytecode iteration. This would require the creation of a new block at the
256 // branch target and a modification of the successor lists.
257 const BitMap& bci_block_start = method()->bci_block_start();
258
259 int end_bci = method()->code_size();
260
261 ciBytecodeStream s(method());
262 while (s.next() != ciBytecodeStream::EOBC()) {
263 int cur_bci = s.cur_bci();
264
265 if (bci_block_start.at(cur_bci)) {
266 current = make_block_at(cur_bci, current);
267 }
268 assert(current != nullptr, "must have current block");
269
270 if (has_xhandlers && GraphBuilder::can_trap(method(), s.cur_bc())) {
271 handle_exceptions(current, cur_bci);
272 }
273
274 switch (s.cur_bc()) {
275 // track stores to local variables for selective creation of phi functions
276 case Bytecodes::_iinc: store_one(current, s.get_index()); break;
277 case Bytecodes::_istore: store_one(current, s.get_index()); break;
278 case Bytecodes::_lstore: store_two(current, s.get_index()); break;
279 case Bytecodes::_fstore: store_one(current, s.get_index()); break;
280 case Bytecodes::_dstore: store_two(current, s.get_index()); break;
281 case Bytecodes::_astore: store_one(current, s.get_index()); break;
282 case Bytecodes::_istore_0: store_one(current, 0); break;
283 case Bytecodes::_istore_1: store_one(current, 1); break;
284 case Bytecodes::_istore_2: store_one(current, 2); break;
285 case Bytecodes::_istore_3: store_one(current, 3); break;
286 case Bytecodes::_lstore_0: store_two(current, 0); break;
287 case Bytecodes::_lstore_1: store_two(current, 1); break;
288 case Bytecodes::_lstore_2: store_two(current, 2); break;
289 case Bytecodes::_lstore_3: store_two(current, 3); break;
290 case Bytecodes::_fstore_0: store_one(current, 0); break;
291 case Bytecodes::_fstore_1: store_one(current, 1); break;
292 case Bytecodes::_fstore_2: store_one(current, 2); break;
293 case Bytecodes::_fstore_3: store_one(current, 3); break;
294 case Bytecodes::_dstore_0: store_two(current, 0); break;
295 case Bytecodes::_dstore_1: store_two(current, 1); break;
296 case Bytecodes::_dstore_2: store_two(current, 2); break;
297 case Bytecodes::_dstore_3: store_two(current, 3); break;
298 case Bytecodes::_astore_0: store_one(current, 0); break;
299 case Bytecodes::_astore_1: store_one(current, 1); break;
300 case Bytecodes::_astore_2: store_one(current, 2); break;
301 case Bytecodes::_astore_3: store_one(current, 3); break;
302
303 // track bytecodes that affect the control flow
304 case Bytecodes::_athrow: // fall through
305 case Bytecodes::_ret: // fall through
306 case Bytecodes::_ireturn: // fall through
307 case Bytecodes::_lreturn: // fall through
308 case Bytecodes::_freturn: // fall through
309 case Bytecodes::_dreturn: // fall through
310 case Bytecodes::_areturn: // fall through
311 case Bytecodes::_return:
312 current = nullptr;
313 break;
314
315 case Bytecodes::_ifeq: // fall through
316 case Bytecodes::_ifne: // fall through
317 case Bytecodes::_iflt: // fall through
318 case Bytecodes::_ifge: // fall through
319 case Bytecodes::_ifgt: // fall through
320 case Bytecodes::_ifle: // fall through
321 case Bytecodes::_if_icmpeq: // fall through
322 case Bytecodes::_if_icmpne: // fall through
323 case Bytecodes::_if_icmplt: // fall through
324 case Bytecodes::_if_icmpge: // fall through
325 case Bytecodes::_if_icmpgt: // fall through
326 case Bytecodes::_if_icmple: // fall through
327 case Bytecodes::_if_acmpeq: // fall through
328 case Bytecodes::_if_acmpne: // fall through
329 case Bytecodes::_ifnull: // fall through
330 case Bytecodes::_ifnonnull:
331 if (s.next_bci() < end_bci) {
332 make_block_at(s.next_bci(), current);
333 }
334 make_block_at(s.get_dest(), current);
335 current = nullptr;
336 break;
337
338 case Bytecodes::_goto:
339 make_block_at(s.get_dest(), current);
340 current = nullptr;
341 break;
342
343 case Bytecodes::_goto_w:
344 make_block_at(s.get_far_dest(), current);
345 current = nullptr;
346 break;
347
348 case Bytecodes::_jsr:
349 handle_jsr(current, s.get_dest(), s.next_bci());
350 current = nullptr;
351 break;
352
353 case Bytecodes::_jsr_w:
354 handle_jsr(current, s.get_far_dest(), s.next_bci());
355 current = nullptr;
356 break;
357
358 case Bytecodes::_tableswitch: {
359 // set block for each case
360 Bytecode_tableswitch sw(&s);
361 int l = sw.length();
362 for (int i = 0; i < l; i++) {
363 make_block_at(cur_bci + sw.dest_offset_at(i), current);
364 }
365 make_block_at(cur_bci + sw.default_offset(), current);
366 current = nullptr;
367 break;
368 }
369
370 case Bytecodes::_lookupswitch: {
371 // set block for each case
372 Bytecode_lookupswitch sw(&s);
373 int l = sw.number_of_pairs();
374 for (int i = 0; i < l; i++) {
375 make_block_at(cur_bci + sw.pair_at(i).offset(), current);
376 }
377 make_block_at(cur_bci + sw.default_offset(), current);
378 current = nullptr;
379 break;
380 }
381
382 default:
383 break;
384 }
385 }
386 }
387
388
389 void BlockListBuilder::mark_loops() {
390 ResourceMark rm;
391
392 const int number_of_blocks = _blocks.length();
393 _active.initialize(number_of_blocks);
394 _visited.initialize(number_of_blocks);
395 _loop_map = GrowableArray<ResourceBitMap>(number_of_blocks, number_of_blocks, ResourceBitMap());
396 for (int i = 0; i < number_of_blocks; i++) {
397 _loop_map.at(i).initialize(number_of_blocks);
398 }
399 _next_loop_index = 0;
400 _next_block_number = _blocks.length();
401
402 // The loop detection algorithm works as follows:
403 // - We maintain the _loop_map, where for each block we have a bitmap indicating which loops contain this block.
404 // - The CFG is recursively traversed (depth-first) and if we detect a loop, we assign the loop a unique number that is stored
405 // in the bitmap associated with the loop header block. Until we return back through that loop header the bitmap contains
406 // only a single bit corresponding to the loop number.
407 // - The bit is then propagated for all the blocks in the loop after we exit them (post-order). There could be multiple bits
408 // of course in case of nested loops.
409 // - When we exit the loop header we remove that single bit and assign the real loop state for it.
410 // - Now, the tricky part here is how we detect irreducible loops. In the algorithm above the loop state bits
411 // are propagated to the predecessors. If we encounter an irreducible loop (a loop with multiple heads) we would see
412 // a node with some loop bit set that would then propagate back and be never cleared because we would
413 // never go back through the original loop header. Therefore if there are any irreducible loops the bits in the states
414 // for these loops are going to propagate back to the root.
415 BlockBegin* start = _bci2block->at(0);
416 _block_id_start = start->block_id();
417 BitMap& loop_state = mark_loops(start, false);
418 if (!loop_state.is_empty()) {
419 compilation()->set_has_irreducible_loops(true);
420 }
421 assert(_next_block_number >= 0, "invalid block numbers");
422
423 // Remove dangling Resource pointers before the ResourceMark goes out-of-scope.
424 _active.resize(0);
425 _visited.resize(0);
426 _loop_map.clear();
427 }
428
429 void BlockListBuilder::make_loop_header(BlockBegin* block) {
430 int block_id = block->block_id();
431 int block_bit = bit_number(block_id);
432 if (block->is_set(BlockBegin::exception_entry_flag)) {
433 // exception edges may look like loops but don't mark them as such
434 // since it screws up block ordering.
435 return;
436 }
437 if (!block->is_set(BlockBegin::parser_loop_header_flag)) {
438 block->set(BlockBegin::parser_loop_header_flag);
439
440 assert(_loop_map.at(block_bit).is_empty(), "must not be set yet");
441 assert(0 <= _next_loop_index && _next_loop_index < _loop_map.length(), "_next_loop_index is too large");
442 _loop_map.at(block_bit).set_bit(_next_loop_index++);
443 } else {
444 // block already marked as loop header
445 assert(_loop_map.at(block_bit).count_one_bits() == 1, "exactly one bit must be set");
446 }
447 }
448
449 BitMap& BlockListBuilder::mark_loops(BlockBegin* block, bool in_subroutine) {
450 int block_id = block->block_id();
451 int block_bit = bit_number(block_id);
452 if (_visited.at(block_bit)) {
453 if (_active.at(block_bit)) {
454 // reached block via backward branch
455 make_loop_header(block);
456 }
457 // return cached loop information for this block
458 return _loop_map.at(block_bit);
459 }
460
461 if (block->is_set(BlockBegin::subroutine_entry_flag)) {
462 in_subroutine = true;
463 }
464
465 // set active and visited bits before successors are processed
466 _visited.set_bit(block_bit);
467 _active.set_bit(block_bit);
468
469 ResourceMark rm;
470 ResourceBitMap loop_state(_loop_map.length());
471 for (int i = number_of_successors(block) - 1; i >= 0; i--) {
472 BlockBegin* sux = successor_at(block, i);
473 // recursively process all successors
474 loop_state.set_union(mark_loops(sux, in_subroutine));
475 }
476
477 // clear active-bit after all successors are processed
478 _active.clear_bit(block_bit);
479
480 // reverse-post-order numbering of all blocks
481 block->set_depth_first_number(_next_block_number);
482 _next_block_number--;
483
484 if (!loop_state.is_empty() || in_subroutine ) {
485 // block is contained at least in one loop, so phi functions are necessary
486 // phi functions are also necessary for all locals stored in a subroutine
487 scope()->requires_phi_function().set_union(block->stores_to_locals());
488 }
489
490 if (block->is_set(BlockBegin::parser_loop_header_flag)) {
491 BitMap& header_loop_state = _loop_map.at(block_bit);
492 assert(header_loop_state.count_one_bits() == 1, "exactly one bit must be set");
493 // remove the bit with the loop number for the state (header is outside of the loop)
494 loop_state.set_difference(header_loop_state);
495 }
496
497 // cache and return loop information for this block
498 _loop_map.at(block_bit).set_from(loop_state);
499 return _loop_map.at(block_bit);
500 }
501
502 inline int BlockListBuilder::number_of_successors(BlockBegin* block)
503 {
504 assert(_bci2block_successors.length() > block->bci(), "sux must exist");
505 return _bci2block_successors.at(block->bci()).length();
506 }
507
508 inline BlockBegin* BlockListBuilder::successor_at(BlockBegin* block, int i)
509 {
510 assert(_bci2block_successors.length() > block->bci(), "sux must exist");
511 return _bci2block_successors.at(block->bci()).at(i);
512 }
513
514 inline void BlockListBuilder::add_successor(BlockBegin* block, BlockBegin* sux)
515 {
516 assert(_bci2block_successors.length() > block->bci(), "sux must exist");
517 _bci2block_successors.at(block->bci()).append(sux);
518 }
519
520 inline bool BlockListBuilder::is_successor(BlockBegin* block, BlockBegin* sux) {
521 assert(_bci2block_successors.length() > block->bci(), "sux must exist");
522 return _bci2block_successors.at(block->bci()).contains(sux);
523 }
524
525 #ifndef PRODUCT
526
527 int compare_depth_first(BlockBegin** a, BlockBegin** b) {
528 return (*a)->depth_first_number() - (*b)->depth_first_number();
529 }
530
531 void BlockListBuilder::print() {
532 tty->print("----- initial block list of BlockListBuilder for method ");
533 method()->print_short_name();
534 tty->cr();
535
536 // better readability if blocks are sorted in processing order
537 _blocks.sort(compare_depth_first);
538
539 for (int i = 0; i < _blocks.length(); i++) {
540 BlockBegin* cur = _blocks.at(i);
541 tty->print("%4d: B%-4d bci: %-4d preds: %-4d ", cur->depth_first_number(), cur->block_id(), cur->bci(), cur->total_preds());
542
543 tty->print(cur->is_set(BlockBegin::std_entry_flag) ? " std" : " ");
544 tty->print(cur->is_set(BlockBegin::osr_entry_flag) ? " osr" : " ");
545 tty->print(cur->is_set(BlockBegin::exception_entry_flag) ? " ex" : " ");
546 tty->print(cur->is_set(BlockBegin::subroutine_entry_flag) ? " sr" : " ");
547 tty->print(cur->is_set(BlockBegin::parser_loop_header_flag) ? " lh" : " ");
548
549 if (number_of_successors(cur) > 0) {
550 tty->print(" sux: ");
551 for (int j = 0; j < number_of_successors(cur); j++) {
552 BlockBegin* sux = successor_at(cur, j);
553 tty->print("B%d ", sux->block_id());
554 }
555 }
556 tty->cr();
557 }
558 }
559
560 #endif
561
562
563 // A simple growable array of Values indexed by ciFields
564 class FieldBuffer: public CompilationResourceObj {
565 private:
566 GrowableArray<Value> _values;
567
568 public:
569 FieldBuffer() {}
570
571 void kill() {
572 _values.trunc_to(0);
573 }
574
575 Value at(ciField* field) {
576 assert(field->holder()->is_loaded(), "must be a loaded field");
577 int offset = field->offset_in_bytes();
578 if (offset < _values.length()) {
579 return _values.at(offset);
580 } else {
581 return nullptr;
582 }
583 }
584
585 void at_put(ciField* field, Value value) {
586 assert(field->holder()->is_loaded(), "must be a loaded field");
587 int offset = field->offset_in_bytes();
588 _values.at_put_grow(offset, value, nullptr);
589 }
590
591 };
592
593
594 // MemoryBuffer is fairly simple model of the current state of memory.
595 // It partitions memory into several pieces. The first piece is
596 // generic memory where little is known about the owner of the memory.
597 // This is conceptually represented by the tuple <O, F, V> which says
598 // that the field F of object O has value V. This is flattened so
599 // that F is represented by the offset of the field and the parallel
600 // arrays _objects and _values are used for O and V. Loads of O.F can
601 // simply use V. Newly allocated objects are kept in a separate list
602 // along with a parallel array for each object which represents the
603 // current value of its fields. Stores of the default value to fields
604 // which have never been stored to before are eliminated since they
605 // are redundant. Once newly allocated objects are stored into
606 // another object or they are passed out of the current compile they
607 // are treated like generic memory.
608
609 class MemoryBuffer: public CompilationResourceObj {
610 private:
611 FieldBuffer _values;
612 GrowableArray<Value> _objects;
613 GrowableArray<Value> _newobjects;
614 GrowableArray<FieldBuffer*> _fields;
615
616 public:
617 MemoryBuffer() {}
618
619 StoreField* store(StoreField* st) {
620 if (!EliminateFieldAccess) {
621 return st;
622 }
623
624 Value object = st->obj();
625 Value value = st->value();
626 ciField* field = st->field();
627 if (field->holder()->is_loaded()) {
628 int offset = field->offset_in_bytes();
629 int index = _newobjects.find(object);
630 if (index != -1) {
631 // newly allocated object with no other stores performed on this field
632 FieldBuffer* buf = _fields.at(index);
633 if (buf->at(field) == nullptr && is_default_value(value)) {
634 #ifndef PRODUCT
635 if (PrintIRDuringConstruction && Verbose) {
636 tty->print_cr("Eliminated store for object %d:", index);
637 st->print_line();
638 }
639 #endif
640 return nullptr;
641 } else {
642 buf->at_put(field, value);
643 }
644 } else {
645 _objects.at_put_grow(offset, object, nullptr);
646 _values.at_put(field, value);
647 }
648
649 store_value(value);
650 } else {
651 // if we held onto field names we could alias based on names but
652 // we don't know what's being stored to so kill it all.
653 kill();
654 }
655 return st;
656 }
657
658
659 // return true if this value correspond to the default value of a field.
660 bool is_default_value(Value value) {
661 Constant* con = value->as_Constant();
662 if (con) {
663 switch (con->type()->tag()) {
664 case intTag: return con->type()->as_IntConstant()->value() == 0;
665 case longTag: return con->type()->as_LongConstant()->value() == 0;
666 case floatTag: return jint_cast(con->type()->as_FloatConstant()->value()) == 0;
667 case doubleTag: return jlong_cast(con->type()->as_DoubleConstant()->value()) == jlong_cast(0);
668 case objectTag: return con->type() == objectNull;
669 default: ShouldNotReachHere();
670 }
671 }
672 return false;
673 }
674
675
676 // return either the actual value of a load or the load itself
677 Value load(LoadField* load) {
678 if (!EliminateFieldAccess) {
679 return load;
680 }
681
682 if (strict_fp_requires_explicit_rounding && load->type()->is_float_kind()) {
683 #ifdef IA32
684 if (UseSSE < 2) {
685 // can't skip load since value might get rounded as a side effect
686 return load;
687 }
688 #else
689 Unimplemented();
690 #endif // IA32
691 }
692
693 ciField* field = load->field();
694 Value object = load->obj();
695 if (field->holder()->is_loaded() && !field->is_volatile()) {
696 int offset = field->offset_in_bytes();
697 Value result = nullptr;
698 int index = _newobjects.find(object);
699 if (index != -1) {
700 result = _fields.at(index)->at(field);
701 } else if (_objects.at_grow(offset, nullptr) == object) {
702 result = _values.at(field);
703 }
704 if (result != nullptr) {
705 #ifndef PRODUCT
706 if (PrintIRDuringConstruction && Verbose) {
707 tty->print_cr("Eliminated load: ");
708 load->print_line();
709 }
710 #endif
711 assert(result->type()->tag() == load->type()->tag(), "wrong types");
712 return result;
713 }
714 }
715 return load;
716 }
717
718 // Record this newly allocated object
719 void new_instance(NewInstance* object) {
720 int index = _newobjects.length();
721 _newobjects.append(object);
722 if (_fields.at_grow(index, nullptr) == nullptr) {
723 _fields.at_put(index, new FieldBuffer());
724 } else {
725 _fields.at(index)->kill();
726 }
727 }
728
729 // Record this newly allocated object
730 void new_instance(NewInlineTypeInstance* object) {
731 int index = _newobjects.length();
732 _newobjects.append(object);
733 if (_fields.at_grow(index, nullptr) == nullptr) {
734 _fields.at_put(index, new FieldBuffer());
735 } else {
736 _fields.at(index)->kill();
737 }
738 }
739
740 void store_value(Value value) {
741 int index = _newobjects.find(value);
742 if (index != -1) {
743 // stored a newly allocated object into another object.
744 // Assume we've lost track of it as separate slice of memory.
745 // We could do better by keeping track of whether individual
746 // fields could alias each other.
747 _newobjects.remove_at(index);
748 // pull out the field info and store it at the end up the list
749 // of field info list to be reused later.
750 _fields.append(_fields.at(index));
751 _fields.remove_at(index);
752 }
753 }
754
755 void kill() {
756 _newobjects.trunc_to(0);
757 _objects.trunc_to(0);
758 _values.kill();
759 }
760 };
761
762
763 // Implementation of GraphBuilder's ScopeData
764
765 GraphBuilder::ScopeData::ScopeData(ScopeData* parent)
766 : _parent(parent)
767 , _bci2block(nullptr)
768 , _scope(nullptr)
769 , _has_handler(false)
770 , _stream(nullptr)
771 , _work_list(nullptr)
772 , _caller_stack_size(-1)
773 , _continuation(nullptr)
774 , _parsing_jsr(false)
775 , _jsr_xhandlers(nullptr)
776 , _num_returns(0)
777 , _cleanup_block(nullptr)
778 , _cleanup_return_prev(nullptr)
779 , _cleanup_state(nullptr)
780 , _ignore_return(false)
781 {
782 if (parent != nullptr) {
783 _max_inline_size = (intx) ((float) NestedInliningSizeRatio * (float) parent->max_inline_size() / 100.0f);
784 } else {
785 _max_inline_size = C1MaxInlineSize;
786 }
787 if (_max_inline_size < C1MaxTrivialSize) {
788 _max_inline_size = C1MaxTrivialSize;
789 }
790 }
791
792
793 void GraphBuilder::kill_all() {
794 if (UseLocalValueNumbering) {
795 vmap()->kill_all();
796 }
797 _memory->kill();
798 }
799
800
801 BlockBegin* GraphBuilder::ScopeData::block_at(int bci) {
802 if (parsing_jsr()) {
803 // It is necessary to clone all blocks associated with a
804 // subroutine, including those for exception handlers in the scope
805 // of the method containing the jsr (because those exception
806 // handlers may contain ret instructions in some cases).
807 BlockBegin* block = bci2block()->at(bci);
808 if (block != nullptr && block == parent()->bci2block()->at(bci)) {
809 BlockBegin* new_block = new BlockBegin(block->bci());
810 if (PrintInitialBlockList) {
811 tty->print_cr("CFG: cloned block %d (bci %d) as block %d for jsr",
812 block->block_id(), block->bci(), new_block->block_id());
813 }
814 // copy data from cloned blocked
815 new_block->set_depth_first_number(block->depth_first_number());
816 if (block->is_set(BlockBegin::parser_loop_header_flag)) new_block->set(BlockBegin::parser_loop_header_flag);
817 // Preserve certain flags for assertion checking
818 if (block->is_set(BlockBegin::subroutine_entry_flag)) new_block->set(BlockBegin::subroutine_entry_flag);
819 if (block->is_set(BlockBegin::exception_entry_flag)) new_block->set(BlockBegin::exception_entry_flag);
820
821 // copy was_visited_flag to allow early detection of bailouts
822 // if a block that is used in a jsr has already been visited before,
823 // it is shared between the normal control flow and a subroutine
824 // BlockBegin::try_merge returns false when the flag is set, this leads
825 // to a compilation bailout
826 if (block->is_set(BlockBegin::was_visited_flag)) new_block->set(BlockBegin::was_visited_flag);
827
828 bci2block()->at_put(bci, new_block);
829 block = new_block;
830 }
831 return block;
832 } else {
833 return bci2block()->at(bci);
834 }
835 }
836
837
838 XHandlers* GraphBuilder::ScopeData::xhandlers() const {
839 if (_jsr_xhandlers == nullptr) {
840 assert(!parsing_jsr(), "");
841 return scope()->xhandlers();
842 }
843 assert(parsing_jsr(), "");
844 return _jsr_xhandlers;
845 }
846
847
848 void GraphBuilder::ScopeData::set_scope(IRScope* scope) {
849 _scope = scope;
850 bool parent_has_handler = false;
851 if (parent() != nullptr) {
852 parent_has_handler = parent()->has_handler();
853 }
854 _has_handler = parent_has_handler || scope->xhandlers()->has_handlers();
855 }
856
857
858 void GraphBuilder::ScopeData::set_inline_cleanup_info(BlockBegin* block,
859 Instruction* return_prev,
860 ValueStack* return_state) {
861 _cleanup_block = block;
862 _cleanup_return_prev = return_prev;
863 _cleanup_state = return_state;
864 }
865
866
867 void GraphBuilder::ScopeData::add_to_work_list(BlockBegin* block) {
868 if (_work_list == nullptr) {
869 _work_list = new BlockList();
870 }
871
872 if (!block->is_set(BlockBegin::is_on_work_list_flag)) {
873 // Do not start parsing the continuation block while in a
874 // sub-scope
875 if (parsing_jsr()) {
876 if (block == jsr_continuation()) {
877 return;
878 }
879 } else {
880 if (block == continuation()) {
881 return;
882 }
883 }
884 block->set(BlockBegin::is_on_work_list_flag);
885 _work_list->push(block);
886
887 sort_top_into_worklist(_work_list, block);
888 }
889 }
890
891
892 void GraphBuilder::sort_top_into_worklist(BlockList* worklist, BlockBegin* top) {
893 assert(worklist->top() == top, "");
894 // sort block descending into work list
895 const int dfn = top->depth_first_number();
896 assert(dfn != -1, "unknown depth first number");
897 int i = worklist->length()-2;
898 while (i >= 0) {
899 BlockBegin* b = worklist->at(i);
900 if (b->depth_first_number() < dfn) {
901 worklist->at_put(i+1, b);
902 } else {
903 break;
904 }
905 i --;
906 }
907 if (i >= -1) worklist->at_put(i + 1, top);
908 }
909
910
911 BlockBegin* GraphBuilder::ScopeData::remove_from_work_list() {
912 if (is_work_list_empty()) {
913 return nullptr;
914 }
915 return _work_list->pop();
916 }
917
918
919 bool GraphBuilder::ScopeData::is_work_list_empty() const {
920 return (_work_list == nullptr || _work_list->length() == 0);
921 }
922
923
924 void GraphBuilder::ScopeData::setup_jsr_xhandlers() {
925 assert(parsing_jsr(), "");
926 // clone all the exception handlers from the scope
927 XHandlers* handlers = new XHandlers(scope()->xhandlers());
928 const int n = handlers->length();
929 for (int i = 0; i < n; i++) {
930 // The XHandlers need to be adjusted to dispatch to the cloned
931 // handler block instead of the default one but the synthetic
932 // unlocker needs to be handled specially. The synthetic unlocker
933 // should be left alone since there can be only one and all code
934 // should dispatch to the same one.
935 XHandler* h = handlers->handler_at(i);
936 assert(h->handler_bci() != SynchronizationEntryBCI, "must be real");
937 h->set_entry_block(block_at(h->handler_bci()));
938 }
939 _jsr_xhandlers = handlers;
940 }
941
942
943 int GraphBuilder::ScopeData::num_returns() {
944 if (parsing_jsr()) {
945 return parent()->num_returns();
946 }
947 return _num_returns;
948 }
949
950
951 void GraphBuilder::ScopeData::incr_num_returns() {
952 if (parsing_jsr()) {
953 parent()->incr_num_returns();
954 } else {
955 ++_num_returns;
956 }
957 }
958
959
960 // Implementation of GraphBuilder
961
962 #define INLINE_BAILOUT(msg) { inline_bailout(msg); return false; }
963
964
965 void GraphBuilder::load_constant() {
966 ciConstant con = stream()->get_constant();
967 if (con.is_valid()) {
968 ValueType* t = illegalType;
969 ValueStack* patch_state = nullptr;
970 switch (con.basic_type()) {
971 case T_BOOLEAN: t = new IntConstant (con.as_boolean()); break;
972 case T_BYTE : t = new IntConstant (con.as_byte ()); break;
973 case T_CHAR : t = new IntConstant (con.as_char ()); break;
974 case T_SHORT : t = new IntConstant (con.as_short ()); break;
975 case T_INT : t = new IntConstant (con.as_int ()); break;
976 case T_LONG : t = new LongConstant (con.as_long ()); break;
977 case T_FLOAT : t = new FloatConstant (con.as_float ()); break;
978 case T_DOUBLE : t = new DoubleConstant(con.as_double ()); break;
979 case T_ARRAY : // fall-through
980 case T_OBJECT : {
981 ciObject* obj = con.as_object();
982 if (!obj->is_loaded() || (PatchALot && !stream()->is_string_constant())) {
983 // A Class, MethodType, MethodHandle, Dynamic, or String.
984 patch_state = copy_state_before();
985 t = new ObjectConstant(obj);
986 } else {
987 // Might be a Class, MethodType, MethodHandle, or Dynamic constant
988 // result, which might turn out to be an array.
989 if (obj->is_null_object()) {
990 t = objectNull;
991 } else if (obj->is_array()) {
992 t = new ArrayConstant(obj->as_array());
993 } else {
994 t = new InstanceConstant(obj->as_instance());
995 }
996 }
997 break;
998 }
999 default: ShouldNotReachHere();
1000 }
1001 Value x;
1002 if (patch_state != nullptr) {
1003 // Arbitrary memory effects from running BSM or class loading (using custom loader) during linkage.
1004 bool kills_memory = stream()->is_dynamic_constant() ||
1005 (!stream()->is_string_constant() && !method()->holder()->has_trusted_loader());
1006 x = new Constant(t, patch_state, kills_memory);
1007 } else {
1008 x = new Constant(t);
1009 }
1010
1011 // Unbox the value at runtime, if needed.
1012 // ConstantDynamic entry can be of a primitive type, but it is cached in boxed form.
1013 if (patch_state != nullptr) {
1014 int index = stream()->get_constant_pool_index();
1015 BasicType type = stream()->get_basic_type_for_constant_at(index);
1016 if (is_java_primitive(type)) {
1017 ciInstanceKlass* box_klass = ciEnv::current()->get_box_klass_for_primitive_type(type);
1018 assert(box_klass->is_loaded(), "sanity");
1019 int offset = java_lang_boxing_object::value_offset(type);
1020 ciField* value_field = box_klass->get_field_by_offset(offset, false /*is_static*/);
1021 x = new LoadField(append(x), offset, value_field, false /*is_static*/, patch_state, false /*needs_patching*/);
1022 t = as_ValueType(type);
1023 } else {
1024 assert(is_reference_type(type), "not a reference: %s", type2name(type));
1025 }
1026 }
1027
1028 push(t, append(x));
1029 } else {
1030 BAILOUT("could not resolve a constant");
1031 }
1032 }
1033
1034
1035 void GraphBuilder::load_local(ValueType* type, int index) {
1036 Value x = state()->local_at(index);
1037 assert(x != nullptr && !x->type()->is_illegal(), "access of illegal local variable");
1038 push(type, x);
1039 if (x->as_NewInlineTypeInstance() != nullptr && x->as_NewInlineTypeInstance()->in_larval_state()) {
1040 if (x->as_NewInlineTypeInstance()->on_stack_count() == 1) {
1041 x->as_NewInlineTypeInstance()->set_not_larva_anymore();
1042 } else {
1043 x->as_NewInlineTypeInstance()->increment_on_stack_count();
1044 }
1045 }
1046 }
1047
1048
1049 void GraphBuilder::store_local(ValueType* type, int index) {
1050 Value x = pop(type);
1051 store_local(state(), x, index);
1052 if (x->as_NewInlineTypeInstance() != nullptr) {
1053 x->as_NewInlineTypeInstance()->set_local_index(index);
1054 }
1055 }
1056
1057
1058 void GraphBuilder::store_local(ValueStack* state, Value x, int index) {
1059 if (parsing_jsr()) {
1060 // We need to do additional tracking of the location of the return
1061 // address for jsrs since we don't handle arbitrary jsr/ret
1062 // constructs. Here we are figuring out in which circumstances we
1063 // need to bail out.
1064 if (x->type()->is_address()) {
1065 scope_data()->set_jsr_return_address_local(index);
1066
1067 // Also check parent jsrs (if any) at this time to see whether
1068 // they are using this local. We don't handle skipping over a
1069 // ret.
1070 for (ScopeData* cur_scope_data = scope_data()->parent();
1071 cur_scope_data != nullptr && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
1072 cur_scope_data = cur_scope_data->parent()) {
1073 if (cur_scope_data->jsr_return_address_local() == index) {
1074 BAILOUT("subroutine overwrites return address from previous subroutine");
1075 }
1076 }
1077 } else if (index == scope_data()->jsr_return_address_local()) {
1078 scope_data()->set_jsr_return_address_local(-1);
1079 }
1080 }
1081
1082 state->store_local(index, round_fp(x));
1083 if (x->as_NewInlineTypeInstance() != nullptr) {
1084 x->as_NewInlineTypeInstance()->set_local_index(index);
1085 }
1086 }
1087
1088
1089 void GraphBuilder::load_indexed(BasicType type) {
1090 // In case of in block code motion in range check elimination
1091 ValueStack* state_before = nullptr;
1092 int array_idx = state()->stack_size() - 2;
1093 if (type == T_OBJECT && state()->stack_at(array_idx)->maybe_flat_array()) {
1094 // Save the entire state and re-execute on deopt when accessing flat arrays
1095 state_before = copy_state_before();
1096 state_before->set_should_reexecute(true);
1097 } else {
1098 state_before = copy_state_indexed_access();
1099 }
1100 compilation()->set_has_access_indexed(true);
1101 Value index = ipop();
1102 Value array = apop();
1103 Value length = nullptr;
1104 if (CSEArrayLength ||
1105 (array->as_Constant() != nullptr) ||
1106 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
1107 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant()) ||
1108 (array->as_NewMultiArray() && array->as_NewMultiArray()->dims()->at(0)->type()->is_constant())) {
1109 length = append(new ArrayLength(array, state_before));
1110 }
1111
1112 bool need_membar = false;
1113 LoadIndexed* load_indexed = nullptr;
1114 Instruction* result = nullptr;
1115 if (array->is_loaded_flat_array()) {
1116 ciType* array_type = array->declared_type();
1117 ciInlineKlass* elem_klass = array_type->as_flat_array_klass()->element_klass()->as_inline_klass();
1118
1119 bool can_delay_access = false;
1120 ciBytecodeStream s(method());
1121 s.force_bci(bci());
1122 s.next();
1123 if (s.cur_bc() == Bytecodes::_getfield) {
1124 bool will_link;
1125 ciField* next_field = s.get_field(will_link);
1126 bool next_needs_patching = !next_field->holder()->is_initialized() ||
1127 !next_field->will_link(method(), Bytecodes::_getfield) ||
1128 PatchALot;
1129 can_delay_access = C1UseDelayedFlattenedFieldReads && !next_needs_patching;
1130 }
1131 if (can_delay_access) {
1132 // potentially optimizable array access, storing information for delayed decision
1133 LoadIndexed* li = new LoadIndexed(array, index, length, type, state_before);
1134 DelayedLoadIndexed* dli = new DelayedLoadIndexed(li, state_before);
1135 li->set_delayed(dli);
1136 set_pending_load_indexed(dli);
1137 return; // Nothing else to do for now
1138 } else {
1139 if (elem_klass->is_empty()) {
1140 // No need to create a new instance, the default instance will be used instead
1141 load_indexed = new LoadIndexed(array, index, length, type, state_before);
1142 apush(append(load_indexed));
1143 } else {
1144 NewInlineTypeInstance* new_instance = new NewInlineTypeInstance(elem_klass, state_before);
1145 _memory->new_instance(new_instance);
1146 apush(append_split(new_instance));
1147 load_indexed = new LoadIndexed(array, index, length, type, state_before);
1148 load_indexed->set_vt(new_instance);
1149 // The LoadIndexed node will initialise this instance by copying from
1150 // the flat field. Ensure these stores are visible before any
1151 // subsequent store that publishes this reference.
1152 need_membar = true;
1153 }
1154 }
1155 } else {
1156 load_indexed = new LoadIndexed(array, index, length, type, state_before);
1157 if (profile_array_accesses() && is_reference_type(type)) {
1158 compilation()->set_would_profile(true);
1159 load_indexed->set_should_profile(true);
1160 load_indexed->set_profiled_method(method());
1161 load_indexed->set_profiled_bci(bci());
1162 }
1163 }
1164 result = append(load_indexed);
1165 if (need_membar) {
1166 append(new MemBar(lir_membar_storestore));
1167 }
1168 assert(!load_indexed->should_profile() || load_indexed == result, "should not be optimized out");
1169 if (!array->is_loaded_flat_array()) {
1170 push(as_ValueType(type), result);
1171 }
1172 }
1173
1174
1175 void GraphBuilder::store_indexed(BasicType type) {
1176 // In case of in block code motion in range check elimination
1177 ValueStack* state_before = nullptr;
1178 int array_idx = state()->stack_size() - 3;
1179 if (type == T_OBJECT && state()->stack_at(array_idx)->maybe_flat_array()) {
1180 // Save the entire state and re-execute on deopt when accessing flat arrays
1181 state_before = copy_state_before();
1182 state_before->set_should_reexecute(true);
1183 } else {
1184 state_before = copy_state_indexed_access();
1185 }
1186 compilation()->set_has_access_indexed(true);
1187 Value value = pop(as_ValueType(type));
1188 Value index = ipop();
1189 Value array = apop();
1190 Value length = nullptr;
1191 if (CSEArrayLength ||
1192 (array->as_Constant() != nullptr) ||
1193 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
1194 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant()) ||
1195 (array->as_NewMultiArray() && array->as_NewMultiArray()->dims()->at(0)->type()->is_constant())) {
1196 length = append(new ArrayLength(array, state_before));
1197 }
1198 ciType* array_type = array->declared_type();
1199 bool check_boolean = false;
1200 if (array_type != nullptr) {
1201 if (array_type->is_loaded() &&
1202 array_type->as_array_klass()->element_type()->basic_type() == T_BOOLEAN) {
1203 assert(type == T_BYTE, "boolean store uses bastore");
1204 Value mask = append(new Constant(new IntConstant(1)));
1205 value = append(new LogicOp(Bytecodes::_iand, value, mask));
1206 }
1207 } else if (type == T_BYTE) {
1208 check_boolean = true;
1209 }
1210
1211 StoreIndexed* store_indexed = new StoreIndexed(array, index, length, type, value, state_before, check_boolean);
1212 if (profile_array_accesses() && is_reference_type(type) && !array->is_loaded_flat_array()) {
1213 compilation()->set_would_profile(true);
1214 store_indexed->set_should_profile(true);
1215 store_indexed->set_profiled_method(method());
1216 store_indexed->set_profiled_bci(bci());
1217 }
1218 Instruction* result = append(store_indexed);
1219 assert(!store_indexed->should_profile() || store_indexed == result, "should not be optimized out");
1220 _memory->store_value(value);
1221 }
1222
1223 void GraphBuilder::stack_op(Bytecodes::Code code) {
1224 switch (code) {
1225 case Bytecodes::_pop:
1226 { Value w = state()->raw_pop();
1227 update_larva_stack_count(w);
1228 }
1229 break;
1230 case Bytecodes::_pop2:
1231 { Value w1 = state()->raw_pop();
1232 Value w2 = state()->raw_pop();
1233 update_larva_stack_count(w1);
1234 update_larva_stack_count(w2);
1235 }
1236 break;
1237 case Bytecodes::_dup:
1238 { Value w = state()->raw_pop();
1239 update_larval_state(w);
1240 state()->raw_push(w);
1241 state()->raw_push(w);
1242 }
1243 break;
1244 case Bytecodes::_dup_x1:
1245 { Value w1 = state()->raw_pop();
1246 Value w2 = state()->raw_pop();
1247 update_larval_state(w1);
1248 state()->raw_push(w1);
1249 state()->raw_push(w2);
1250 state()->raw_push(w1);
1251 }
1252 break;
1253 case Bytecodes::_dup_x2:
1254 { Value w1 = state()->raw_pop();
1255 Value w2 = state()->raw_pop();
1256 Value w3 = state()->raw_pop();
1257 // special handling for the dup_x2/pop sequence (see JDK-8251046)
1258 if (w1 != nullptr && w1->as_NewInlineTypeInstance() != nullptr) {
1259 ciBytecodeStream s(method());
1260 s.force_bci(bci());
1261 s.next();
1262 if (s.cur_bc() != Bytecodes::_pop) {
1263 w1->as_NewInlineTypeInstance()->set_not_larva_anymore();
1264 } else {
1265 w1->as_NewInlineTypeInstance()->increment_on_stack_count();
1266 }
1267 }
1268 state()->raw_push(w1);
1269 state()->raw_push(w3);
1270 state()->raw_push(w2);
1271 state()->raw_push(w1);
1272 }
1273 break;
1274 case Bytecodes::_dup2:
1275 { Value w1 = state()->raw_pop();
1276 Value w2 = state()->raw_pop();
1277 update_larval_state(w1);
1278 update_larval_state(w2);
1279 state()->raw_push(w2);
1280 state()->raw_push(w1);
1281 state()->raw_push(w2);
1282 state()->raw_push(w1);
1283 }
1284 break;
1285 case Bytecodes::_dup2_x1:
1286 { Value w1 = state()->raw_pop();
1287 Value w2 = state()->raw_pop();
1288 Value w3 = state()->raw_pop();
1289 update_larval_state(w1);
1290 update_larval_state(w2);
1291 state()->raw_push(w2);
1292 state()->raw_push(w1);
1293 state()->raw_push(w3);
1294 state()->raw_push(w2);
1295 state()->raw_push(w1);
1296 }
1297 break;
1298 case Bytecodes::_dup2_x2:
1299 { Value w1 = state()->raw_pop();
1300 Value w2 = state()->raw_pop();
1301 Value w3 = state()->raw_pop();
1302 Value w4 = state()->raw_pop();
1303 update_larval_state(w1);
1304 update_larval_state(w2);
1305 state()->raw_push(w2);
1306 state()->raw_push(w1);
1307 state()->raw_push(w4);
1308 state()->raw_push(w3);
1309 state()->raw_push(w2);
1310 state()->raw_push(w1);
1311 }
1312 break;
1313 case Bytecodes::_swap:
1314 { Value w1 = state()->raw_pop();
1315 Value w2 = state()->raw_pop();
1316 state()->raw_push(w1);
1317 state()->raw_push(w2);
1318 }
1319 break;
1320 default:
1321 ShouldNotReachHere();
1322 break;
1323 }
1324 }
1325
1326
1327 void GraphBuilder::arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* state_before) {
1328 Value y = pop(type);
1329 Value x = pop(type);
1330 Value res = new ArithmeticOp(code, x, y, state_before);
1331 // Note: currently single-precision floating-point rounding on Intel is handled at the LIRGenerator level
1332 res = append(res);
1333 res = round_fp(res);
1334 push(type, res);
1335 }
1336
1337
1338 void GraphBuilder::negate_op(ValueType* type) {
1339 push(type, append(new NegateOp(pop(type))));
1340 }
1341
1342
1343 void GraphBuilder::shift_op(ValueType* type, Bytecodes::Code code) {
1344 Value s = ipop();
1345 Value x = pop(type);
1346 // try to simplify
1347 // Note: This code should go into the canonicalizer as soon as it can
1348 // can handle canonicalized forms that contain more than one node.
1349 if (CanonicalizeNodes && code == Bytecodes::_iushr) {
1350 // pattern: x >>> s
1351 IntConstant* s1 = s->type()->as_IntConstant();
1352 if (s1 != nullptr) {
1353 // pattern: x >>> s1, with s1 constant
1354 ShiftOp* l = x->as_ShiftOp();
1355 if (l != nullptr && l->op() == Bytecodes::_ishl) {
1356 // pattern: (a << b) >>> s1
1357 IntConstant* s0 = l->y()->type()->as_IntConstant();
1358 if (s0 != nullptr) {
1359 // pattern: (a << s0) >>> s1
1360 const int s0c = s0->value() & 0x1F; // only the low 5 bits are significant for shifts
1361 const int s1c = s1->value() & 0x1F; // only the low 5 bits are significant for shifts
1362 if (s0c == s1c) {
1363 if (s0c == 0) {
1364 // pattern: (a << 0) >>> 0 => simplify to: a
1365 ipush(l->x());
1366 } else {
1367 // pattern: (a << s0c) >>> s0c => simplify to: a & m, with m constant
1368 assert(0 < s0c && s0c < BitsPerInt, "adjust code below to handle corner cases");
1369 const int m = checked_cast<int>(right_n_bits(BitsPerInt - s0c));
1370 Value s = append(new Constant(new IntConstant(m)));
1371 ipush(append(new LogicOp(Bytecodes::_iand, l->x(), s)));
1372 }
1373 return;
1374 }
1375 }
1376 }
1377 }
1378 }
1379 // could not simplify
1380 push(type, append(new ShiftOp(code, x, s)));
1381 }
1382
1383
1384 void GraphBuilder::logic_op(ValueType* type, Bytecodes::Code code) {
1385 Value y = pop(type);
1386 Value x = pop(type);
1387 push(type, append(new LogicOp(code, x, y)));
1388 }
1389
1390
1391 void GraphBuilder::compare_op(ValueType* type, Bytecodes::Code code) {
1392 ValueStack* state_before = copy_state_before();
1393 Value y = pop(type);
1394 Value x = pop(type);
1395 ipush(append(new CompareOp(code, x, y, state_before)));
1396 }
1397
1398
1399 void GraphBuilder::convert(Bytecodes::Code op, BasicType from, BasicType to) {
1400 push(as_ValueType(to), append(new Convert(op, pop(as_ValueType(from)), as_ValueType(to))));
1401 }
1402
1403
1404 void GraphBuilder::increment() {
1405 int index = stream()->get_index();
1406 int delta = stream()->is_wide() ? (signed short)Bytes::get_Java_u2(stream()->cur_bcp() + 4) : (signed char)(stream()->cur_bcp()[2]);
1407 load_local(intType, index);
1408 ipush(append(new Constant(new IntConstant(delta))));
1409 arithmetic_op(intType, Bytecodes::_iadd);
1410 store_local(intType, index);
1411 }
1412
1413
1414 void GraphBuilder::_goto(int from_bci, int to_bci) {
1415 Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci);
1416 if (is_profiling()) {
1417 compilation()->set_would_profile(true);
1418 x->set_profiled_bci(bci());
1419 if (profile_branches()) {
1420 x->set_profiled_method(method());
1421 x->set_should_profile(true);
1422 }
1423 }
1424 append(x);
1425 }
1426
1427
1428 void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) {
1429 BlockBegin* tsux = block_at(stream()->get_dest());
1430 BlockBegin* fsux = block_at(stream()->next_bci());
1431 bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci();
1432
1433 bool subst_check = false;
1434 if (EnableValhalla && (stream()->cur_bc() == Bytecodes::_if_acmpeq || stream()->cur_bc() == Bytecodes::_if_acmpne)) {
1435 ValueType* left_vt = x->type();
1436 ValueType* right_vt = y->type();
1437 if (left_vt->is_object()) {
1438 assert(right_vt->is_object(), "must be");
1439 ciKlass* left_klass = x->as_loaded_klass_or_null();
1440 ciKlass* right_klass = y->as_loaded_klass_or_null();
1441
1442 if (left_klass == nullptr || right_klass == nullptr) {
1443 // The klass is still unloaded, or came from a Phi node. Go slow case;
1444 subst_check = true;
1445 } else if (left_klass->can_be_inline_klass() || right_klass->can_be_inline_klass()) {
1446 // Either operand may be a value object, but we're not sure. Go slow case;
1447 subst_check = true;
1448 } else {
1449 // No need to do substitutability check
1450 }
1451 }
1452 }
1453 if ((stream()->cur_bc() == Bytecodes::_if_acmpeq || stream()->cur_bc() == Bytecodes::_if_acmpne) &&
1454 is_profiling() && profile_branches()) {
1455 compilation()->set_would_profile(true);
1456 append(new ProfileACmpTypes(method(), bci(), x, y));
1457 }
1458
1459 // In case of loop invariant code motion or predicate insertion
1460 // before the body of a loop the state is needed
1461 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));
1462
1463 assert(i->as_Goto() == nullptr ||
1464 (i->as_Goto()->sux_at(0) == tsux && i->as_Goto()->is_safepoint() == tsux->bci() < stream()->cur_bci()) ||
1465 (i->as_Goto()->sux_at(0) == fsux && i->as_Goto()->is_safepoint() == fsux->bci() < stream()->cur_bci()),
1466 "safepoint state of Goto returned by canonicalizer incorrect");
1467
1468 if (is_profiling()) {
1469 If* if_node = i->as_If();
1470 if (if_node != nullptr) {
1471 // Note that we'd collect profile data in this method if we wanted it.
1472 compilation()->set_would_profile(true);
1473 // At level 2 we need the proper bci to count backedges
1474 if_node->set_profiled_bci(bci());
1475 if (profile_branches()) {
1476 // Successors can be rotated by the canonicalizer, check for this case.
1477 if_node->set_profiled_method(method());
1478 if_node->set_should_profile(true);
1479 if (if_node->tsux() == fsux) {
1480 if_node->set_swapped(true);
1481 }
1482 }
1483 return;
1484 }
1485
1486 // Check if this If was reduced to Goto.
1487 Goto *goto_node = i->as_Goto();
1488 if (goto_node != nullptr) {
1489 compilation()->set_would_profile(true);
1490 goto_node->set_profiled_bci(bci());
1491 if (profile_branches()) {
1492 goto_node->set_profiled_method(method());
1493 goto_node->set_should_profile(true);
1494 // Find out which successor is used.
1495 if (goto_node->default_sux() == tsux) {
1496 goto_node->set_direction(Goto::taken);
1497 } else if (goto_node->default_sux() == fsux) {
1498 goto_node->set_direction(Goto::not_taken);
1499 } else {
1500 ShouldNotReachHere();
1501 }
1502 }
1503 return;
1504 }
1505 }
1506 }
1507
1508
1509 void GraphBuilder::if_zero(ValueType* type, If::Condition cond) {
1510 Value y = append(new Constant(intZero));
1511 ValueStack* state_before = copy_state_before();
1512 Value x = ipop();
1513 if_node(x, cond, y, state_before);
1514 }
1515
1516
1517 void GraphBuilder::if_null(ValueType* type, If::Condition cond) {
1518 Value y = append(new Constant(objectNull));
1519 ValueStack* state_before = copy_state_before();
1520 Value x = apop();
1521 if_node(x, cond, y, state_before);
1522 }
1523
1524
1525 void GraphBuilder::if_same(ValueType* type, If::Condition cond) {
1526 ValueStack* state_before = copy_state_before();
1527 Value y = pop(type);
1528 Value x = pop(type);
1529 if_node(x, cond, y, state_before);
1530 }
1531
1532
1533 void GraphBuilder::jsr(int dest) {
1534 // We only handle well-formed jsrs (those which are "block-structured").
1535 // If the bytecodes are strange (jumping out of a jsr block) then we
1536 // might end up trying to re-parse a block containing a jsr which
1537 // has already been activated. Watch for this case and bail out.
1538 for (ScopeData* cur_scope_data = scope_data();
1539 cur_scope_data != nullptr && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
1540 cur_scope_data = cur_scope_data->parent()) {
1541 if (cur_scope_data->jsr_entry_bci() == dest) {
1542 BAILOUT("too-complicated jsr/ret structure");
1543 }
1544 }
1545
1546 push(addressType, append(new Constant(new AddressConstant(next_bci()))));
1547 if (!try_inline_jsr(dest)) {
1548 return; // bailed out while parsing and inlining subroutine
1549 }
1550 }
1551
1552
1553 void GraphBuilder::ret(int local_index) {
1554 if (!parsing_jsr()) BAILOUT("ret encountered while not parsing subroutine");
1555
1556 if (local_index != scope_data()->jsr_return_address_local()) {
1557 BAILOUT("can not handle complicated jsr/ret constructs");
1558 }
1559
1560 // Rets simply become (NON-SAFEPOINT) gotos to the jsr continuation
1561 append(new Goto(scope_data()->jsr_continuation(), false));
1562 }
1563
1564
1565 void GraphBuilder::table_switch() {
1566 Bytecode_tableswitch sw(stream());
1567 const int l = sw.length();
1568 if (CanonicalizeNodes && l == 1 && compilation()->env()->comp_level() != CompLevel_full_profile) {
1569 // total of 2 successors => use If instead of switch
1570 // Note: This code should go into the canonicalizer as soon as it can
1571 // can handle canonicalized forms that contain more than one node.
1572 Value key = append(new Constant(new IntConstant(sw.low_key())));
1573 BlockBegin* tsux = block_at(bci() + sw.dest_offset_at(0));
1574 BlockBegin* fsux = block_at(bci() + sw.default_offset());
1575 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
1576 // In case of loop invariant code motion or predicate insertion
1577 // before the body of a loop the state is needed
1578 ValueStack* state_before = copy_state_if_bb(is_bb);
1579 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
1580 } else {
1581 // collect successors
1582 BlockList* sux = new BlockList(l + 1, nullptr);
1583 int i;
1584 bool has_bb = false;
1585 for (i = 0; i < l; i++) {
1586 sux->at_put(i, block_at(bci() + sw.dest_offset_at(i)));
1587 if (sw.dest_offset_at(i) < 0) has_bb = true;
1588 }
1589 // add default successor
1590 if (sw.default_offset() < 0) has_bb = true;
1591 sux->at_put(i, block_at(bci() + sw.default_offset()));
1592 // In case of loop invariant code motion or predicate insertion
1593 // before the body of a loop the state is needed
1594 ValueStack* state_before = copy_state_if_bb(has_bb);
1595 Instruction* res = append(new TableSwitch(ipop(), sux, sw.low_key(), state_before, has_bb));
1596 #ifdef ASSERT
1597 if (res->as_Goto()) {
1598 for (i = 0; i < l; i++) {
1599 if (sux->at(i) == res->as_Goto()->sux_at(0)) {
1600 assert(res->as_Goto()->is_safepoint() == sw.dest_offset_at(i) < 0, "safepoint state of Goto returned by canonicalizer incorrect");
1601 }
1602 }
1603 }
1604 #endif
1605 }
1606 }
1607
1608
1609 void GraphBuilder::lookup_switch() {
1610 Bytecode_lookupswitch sw(stream());
1611 const int l = sw.number_of_pairs();
1612 if (CanonicalizeNodes && l == 1 && compilation()->env()->comp_level() != CompLevel_full_profile) {
1613 // total of 2 successors => use If instead of switch
1614 // Note: This code should go into the canonicalizer as soon as it can
1615 // can handle canonicalized forms that contain more than one node.
1616 // simplify to If
1617 LookupswitchPair pair = sw.pair_at(0);
1618 Value key = append(new Constant(new IntConstant(pair.match())));
1619 BlockBegin* tsux = block_at(bci() + pair.offset());
1620 BlockBegin* fsux = block_at(bci() + sw.default_offset());
1621 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
1622 // In case of loop invariant code motion or predicate insertion
1623 // before the body of a loop the state is needed
1624 ValueStack* state_before = copy_state_if_bb(is_bb);;
1625 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
1626 } else {
1627 // collect successors & keys
1628 BlockList* sux = new BlockList(l + 1, nullptr);
1629 intArray* keys = new intArray(l, l, 0);
1630 int i;
1631 bool has_bb = false;
1632 for (i = 0; i < l; i++) {
1633 LookupswitchPair pair = sw.pair_at(i);
1634 if (pair.offset() < 0) has_bb = true;
1635 sux->at_put(i, block_at(bci() + pair.offset()));
1636 keys->at_put(i, pair.match());
1637 }
1638 // add default successor
1639 if (sw.default_offset() < 0) has_bb = true;
1640 sux->at_put(i, block_at(bci() + sw.default_offset()));
1641 // In case of loop invariant code motion or predicate insertion
1642 // before the body of a loop the state is needed
1643 ValueStack* state_before = copy_state_if_bb(has_bb);
1644 Instruction* res = append(new LookupSwitch(ipop(), sux, keys, state_before, has_bb));
1645 #ifdef ASSERT
1646 if (res->as_Goto()) {
1647 for (i = 0; i < l; i++) {
1648 if (sux->at(i) == res->as_Goto()->sux_at(0)) {
1649 assert(res->as_Goto()->is_safepoint() == sw.pair_at(i).offset() < 0, "safepoint state of Goto returned by canonicalizer incorrect");
1650 }
1651 }
1652 }
1653 #endif
1654 }
1655 }
1656
1657 void GraphBuilder::call_register_finalizer() {
1658 // If the receiver requires finalization then emit code to perform
1659 // the registration on return.
1660
1661 // Gather some type information about the receiver
1662 Value receiver = state()->local_at(0);
1663 assert(receiver != nullptr, "must have a receiver");
1664 ciType* declared_type = receiver->declared_type();
1665 ciType* exact_type = receiver->exact_type();
1666 if (exact_type == nullptr &&
1667 receiver->as_Local() &&
1668 receiver->as_Local()->java_index() == 0) {
1669 ciInstanceKlass* ik = compilation()->method()->holder();
1670 if (ik->is_final()) {
1671 exact_type = ik;
1672 } else if (UseCHA && !(ik->has_subklass() || ik->is_interface())) {
1673 // test class is leaf class
1674 compilation()->dependency_recorder()->assert_leaf_type(ik);
1675 exact_type = ik;
1676 } else {
1677 declared_type = ik;
1678 }
1679 }
1680
1681 // see if we know statically that registration isn't required
1682 bool needs_check = true;
1683 if (exact_type != nullptr) {
1684 needs_check = exact_type->as_instance_klass()->has_finalizer();
1685 } else if (declared_type != nullptr) {
1686 ciInstanceKlass* ik = declared_type->as_instance_klass();
1687 if (!Dependencies::has_finalizable_subclass(ik)) {
1688 compilation()->dependency_recorder()->assert_has_no_finalizable_subclasses(ik);
1689 needs_check = false;
1690 }
1691 }
1692
1693 if (needs_check) {
1694 // Perform the registration of finalizable objects.
1695 ValueStack* state_before = copy_state_for_exception();
1696 load_local(objectType, 0);
1697 append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init,
1698 state()->pop_arguments(1),
1699 true, state_before, true));
1700 }
1701 }
1702
1703
1704 void GraphBuilder::method_return(Value x, bool ignore_return) {
1705 if (RegisterFinalizersAtInit &&
1706 method()->intrinsic_id() == vmIntrinsics::_Object_init) {
1707 call_register_finalizer();
1708 }
1709
1710 // The conditions for a memory barrier are described in Parse::do_exits().
1711 bool need_mem_bar = false;
1712 if ((method()->is_object_constructor() || method()->is_static_vnew_factory()) &&
1713 (scope()->wrote_final() ||
1714 (AlwaysSafeConstructors && scope()->wrote_fields()) ||
1715 (support_IRIW_for_not_multiple_copy_atomic_cpu && scope()->wrote_volatile()))) {
1716 need_mem_bar = true;
1717 }
1718
1719 BasicType bt = method()->return_type()->basic_type();
1720 switch (bt) {
1721 case T_BYTE:
1722 {
1723 Value shift = append(new Constant(new IntConstant(24)));
1724 x = append(new ShiftOp(Bytecodes::_ishl, x, shift));
1725 x = append(new ShiftOp(Bytecodes::_ishr, x, shift));
1726 break;
1727 }
1728 case T_SHORT:
1729 {
1730 Value shift = append(new Constant(new IntConstant(16)));
1731 x = append(new ShiftOp(Bytecodes::_ishl, x, shift));
1732 x = append(new ShiftOp(Bytecodes::_ishr, x, shift));
1733 break;
1734 }
1735 case T_CHAR:
1736 {
1737 Value mask = append(new Constant(new IntConstant(0xFFFF)));
1738 x = append(new LogicOp(Bytecodes::_iand, x, mask));
1739 break;
1740 }
1741 case T_BOOLEAN:
1742 {
1743 Value mask = append(new Constant(new IntConstant(1)));
1744 x = append(new LogicOp(Bytecodes::_iand, x, mask));
1745 break;
1746 }
1747 default:
1748 break;
1749 }
1750
1751 // Check to see whether we are inlining. If so, Return
1752 // instructions become Gotos to the continuation point.
1753 if (continuation() != nullptr) {
1754
1755 int invoke_bci = state()->caller_state()->bci();
1756
1757 if (x != nullptr && !ignore_return) {
1758 ciMethod* caller = state()->scope()->caller()->method();
1759 Bytecodes::Code invoke_raw_bc = caller->raw_code_at_bci(invoke_bci);
1760 if (invoke_raw_bc == Bytecodes::_invokehandle || invoke_raw_bc == Bytecodes::_invokedynamic) {
1761 ciType* declared_ret_type = caller->get_declared_signature_at_bci(invoke_bci)->return_type();
1762 if (declared_ret_type->is_klass() && x->exact_type() == nullptr &&
1763 x->declared_type() != declared_ret_type && declared_ret_type != compilation()->env()->Object_klass()) {
1764 x = append(new TypeCast(declared_ret_type->as_klass(), x, copy_state_before()));
1765 }
1766 }
1767 }
1768
1769 assert(!method()->is_synchronized() || InlineSynchronizedMethods, "can not inline synchronized methods yet");
1770
1771 if (compilation()->env()->dtrace_method_probes()) {
1772 // Report exit from inline methods
1773 Values* args = new Values(1);
1774 args->push(append(new Constant(new MethodConstant(method()))));
1775 append(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args));
1776 }
1777
1778 // If the inlined method is synchronized, the monitor must be
1779 // released before we jump to the continuation block.
1780 if (method()->is_synchronized()) {
1781 assert(state()->locks_size() == 1, "receiver must be locked here");
1782 monitorexit(state()->lock_at(0), SynchronizationEntryBCI);
1783 }
1784
1785 if (need_mem_bar) {
1786 append(new MemBar(lir_membar_storestore));
1787 }
1788
1789 // State at end of inlined method is the state of the caller
1790 // without the method parameters on stack, including the
1791 // return value, if any, of the inlined method on operand stack.
1792 set_state(state()->caller_state()->copy_for_parsing());
1793 if (x != nullptr) {
1794 if (!ignore_return) {
1795 state()->push(x->type(), x);
1796 }
1797 if (profile_return() && x->type()->is_object_kind()) {
1798 ciMethod* caller = state()->scope()->method();
1799 profile_return_type(x, method(), caller, invoke_bci);
1800 }
1801 }
1802 Goto* goto_callee = new Goto(continuation(), false);
1803
1804 // See whether this is the first return; if so, store off some
1805 // of the state for later examination
1806 if (num_returns() == 0) {
1807 set_inline_cleanup_info();
1808 }
1809
1810 // The current bci() is in the wrong scope, so use the bci() of
1811 // the continuation point.
1812 append_with_bci(goto_callee, scope_data()->continuation()->bci());
1813 incr_num_returns();
1814 return;
1815 }
1816
1817 state()->truncate_stack(0);
1818 if (method()->is_synchronized()) {
1819 // perform the unlocking before exiting the method
1820 Value receiver;
1821 if (!method()->is_static()) {
1822 receiver = _initial_state->local_at(0);
1823 } else {
1824 receiver = append(new Constant(new ClassConstant(method()->holder())));
1825 }
1826 append_split(new MonitorExit(receiver, state()->unlock()));
1827 }
1828
1829 if (need_mem_bar) {
1830 append(new MemBar(lir_membar_storestore));
1831 }
1832
1833 assert(!ignore_return, "Ignoring return value works only for inlining");
1834 append(new Return(x));
1835 }
1836
1837 Value GraphBuilder::make_constant(ciConstant field_value, ciField* field) {
1838 if (!field_value.is_valid()) return nullptr;
1839
1840 BasicType field_type = field_value.basic_type();
1841 ValueType* value = as_ValueType(field_value);
1842
1843 // Attach dimension info to stable arrays.
1844 if (FoldStableValues &&
1845 field->is_stable() && field_type == T_ARRAY && !field_value.is_null_or_zero()) {
1846 ciArray* array = field_value.as_object()->as_array();
1847 jint dimension = field->type()->as_array_klass()->dimension();
1848 value = new StableArrayConstant(array, dimension);
1849 }
1850
1851 switch (field_type) {
1852 case T_ARRAY:
1853 case T_OBJECT:
1854 if (field_value.as_object()->should_be_constant()) {
1855 return new Constant(value);
1856 }
1857 return nullptr; // Not a constant.
1858 default:
1859 return new Constant(value);
1860 }
1861 }
1862
1863 void GraphBuilder::copy_inline_content(ciInlineKlass* vk, Value src, int src_off, Value dest, int dest_off, ValueStack* state_before, ciField* enclosing_field) {
1864 for (int i = 0; i < vk->nof_nonstatic_fields(); i++) {
1865 ciField* inner_field = vk->nonstatic_field_at(i);
1866 assert(!inner_field->is_flat(), "the iteration over nested fields is handled by the loop itself");
1867 int off = inner_field->offset_in_bytes() - vk->first_field_offset();
1868 LoadField* load = new LoadField(src, src_off + off, inner_field, false, state_before, false);
1869 Value replacement = append(load);
1870 StoreField* store = new StoreField(dest, dest_off + off, inner_field, replacement, false, state_before, false);
1871 store->set_enclosing_field(enclosing_field);
1872 append(store);
1873 }
1874 }
1875
1876 void GraphBuilder::access_field(Bytecodes::Code code) {
1877 bool will_link;
1878 ciField* field = stream()->get_field(will_link);
1879 ciInstanceKlass* holder = field->holder();
1880 BasicType field_type = field->type()->basic_type();
1881 ValueType* type = as_ValueType(field_type);
1882
1883 // call will_link again to determine if the field is valid.
1884 const bool needs_patching = !holder->is_loaded() ||
1885 !field->will_link(method(), code) ||
1886 (!field->is_flat() && PatchALot);
1887
1888 ValueStack* state_before = nullptr;
1889 if (!holder->is_initialized() || needs_patching) {
1890 // save state before instruction for debug info when
1891 // deoptimization happens during patching
1892 state_before = copy_state_before();
1893 }
1894
1895 Value obj = nullptr;
1896 if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) {
1897 if (state_before != nullptr) {
1898 // build a patching constant
1899 obj = new Constant(new InstanceConstant(holder->java_mirror()), state_before);
1900 } else {
1901 obj = new Constant(new InstanceConstant(holder->java_mirror()));
1902 }
1903 }
1904
1905 if (field->is_final() && code == Bytecodes::_putfield) {
1906 scope()->set_wrote_final();
1907 }
1908
1909 if (code == Bytecodes::_putfield) {
1910 scope()->set_wrote_fields();
1911 if (field->is_volatile()) {
1912 scope()->set_wrote_volatile();
1913 }
1914 }
1915
1916 int offset = !needs_patching ? field->offset_in_bytes() : -1;
1917 switch (code) {
1918 case Bytecodes::_getstatic: {
1919 // check for compile-time constants, i.e., initialized static final fields
1920 Value constant = nullptr;
1921 if (field->is_static_constant() && !PatchALot) {
1922 ciConstant field_value = field->constant_value();
1923 assert(!field->is_stable() || !field_value.is_null_or_zero(),
1924 "stable static w/ default value shouldn't be a constant");
1925 constant = make_constant(field_value, field);
1926 } else if (field->is_null_free() && field->type()->as_instance_klass()->is_initialized() &&
1927 field->type()->as_inline_klass()->is_empty()) {
1928 // Loading from a field of an empty inline type. Just return the default instance.
1929 constant = new Constant(new InstanceConstant(field->type()->as_inline_klass()->default_instance()));
1930 }
1931 if (constant != nullptr) {
1932 push(type, append(constant));
1933 } else {
1934 if (state_before == nullptr) {
1935 state_before = copy_state_for_exception();
1936 }
1937 LoadField* load_field = new LoadField(append(obj), offset, field, true,
1938 state_before, needs_patching);
1939 push(type, append(load_field));
1940 }
1941 break;
1942 }
1943 case Bytecodes::_putstatic: {
1944 Value val = pop(type);
1945 if (state_before == nullptr) {
1946 state_before = copy_state_for_exception();
1947 }
1948 if (field_type == T_BOOLEAN) {
1949 Value mask = append(new Constant(new IntConstant(1)));
1950 val = append(new LogicOp(Bytecodes::_iand, val, mask));
1951 }
1952 if (field->is_null_free() && field->type()->is_loaded() && field->type()->as_inline_klass()->is_empty()) {
1953 // Storing to a field of an empty inline type. Ignore.
1954 break;
1955 }
1956 append(new StoreField(append(obj), offset, field, val, true, state_before, needs_patching));
1957 break;
1958 }
1959 case Bytecodes::_getfield: {
1960 // Check for compile-time constants, i.e., trusted final non-static fields.
1961 Value constant = nullptr;
1962 if (state_before == nullptr && field->is_flat()) {
1963 // Save the entire state and re-execute on deopt when accessing flat fields
1964 assert(Interpreter::bytecode_should_reexecute(code), "should reexecute");
1965 state_before = copy_state_before();
1966 }
1967 if (!has_pending_field_access() && !has_pending_load_indexed()) {
1968 obj = apop();
1969 ObjectType* obj_type = obj->type()->as_ObjectType();
1970 if (field->is_null_free() && field->type()->as_instance_klass()->is_initialized()
1971 && field->type()->as_inline_klass()->is_empty()) {
1972 // Loading from a field of an empty inline type. Just return the default instance.
1973 null_check(obj);
1974 constant = new Constant(new InstanceConstant(field->type()->as_inline_klass()->default_instance()));
1975 } else if (field->is_constant() && !field->is_flat() && obj_type->is_constant() && !PatchALot) {
1976 ciObject* const_oop = obj_type->constant_value();
1977 if (!const_oop->is_null_object() && const_oop->is_loaded()) {
1978 ciConstant field_value = field->constant_value_of(const_oop);
1979 if (field_value.is_valid()) {
1980 if (field->is_null_free() && field_value.is_null_or_zero()) {
1981 // Non-flat inline type field. Replace null by the default value.
1982 constant = new Constant(new InstanceConstant(field->type()->as_inline_klass()->default_instance()));
1983 } else {
1984 constant = make_constant(field_value, field);
1985 }
1986 // For CallSite objects add a dependency for invalidation of the optimization.
1987 if (field->is_call_site_target()) {
1988 ciCallSite* call_site = const_oop->as_call_site();
1989 if (!call_site->is_fully_initialized_constant_call_site()) {
1990 ciMethodHandle* target = field_value.as_object()->as_method_handle();
1991 dependency_recorder()->assert_call_site_target_value(call_site, target);
1992 }
1993 }
1994 }
1995 }
1996 }
1997 }
1998 if (constant != nullptr) {
1999 push(type, append(constant));
2000 } else {
2001 if (state_before == nullptr) {
2002 state_before = copy_state_for_exception();
2003 }
2004 if (!field->is_flat()) {
2005 if (has_pending_field_access()) {
2006 assert(!needs_patching, "Can't patch delayed field access");
2007 obj = pending_field_access()->obj();
2008 offset += pending_field_access()->offset() - field->holder()->as_inline_klass()->first_field_offset();
2009 field = pending_field_access()->holder()->get_field_by_offset(offset, false);
2010 assert(field != nullptr, "field not found");
2011 set_pending_field_access(nullptr);
2012 } else if (has_pending_load_indexed()) {
2013 assert(!needs_patching, "Can't patch delayed field access");
2014 pending_load_indexed()->update(field, offset - field->holder()->as_inline_klass()->first_field_offset());
2015 LoadIndexed* li = pending_load_indexed()->load_instr();
2016 li->set_type(type);
2017 push(type, append(li));
2018 set_pending_load_indexed(nullptr);
2019 break;
2020 }
2021 LoadField* load = new LoadField(obj, offset, field, false, state_before, needs_patching);
2022 Value replacement = !needs_patching ? _memory->load(load) : load;
2023 if (replacement != load) {
2024 assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked");
2025 // Writing an (integer) value to a boolean, byte, char or short field includes an implicit narrowing
2026 // conversion. Emit an explicit conversion here to get the correct field value after the write.
2027 switch (field_type) {
2028 case T_BOOLEAN:
2029 case T_BYTE:
2030 replacement = append(new Convert(Bytecodes::_i2b, replacement, type));
2031 break;
2032 case T_CHAR:
2033 replacement = append(new Convert(Bytecodes::_i2c, replacement, type));
2034 break;
2035 case T_SHORT:
2036 replacement = append(new Convert(Bytecodes::_i2s, replacement, type));
2037 break;
2038 default:
2039 break;
2040 }
2041 push(type, replacement);
2042 } else {
2043 push(type, append(load));
2044 }
2045 } else {
2046 // Look at the next bytecode to check if we can delay the field access
2047 bool can_delay_access = false;
2048 ciBytecodeStream s(method());
2049 s.force_bci(bci());
2050 s.next();
2051 if (s.cur_bc() == Bytecodes::_getfield && !needs_patching) {
2052 ciField* next_field = s.get_field(will_link);
2053 bool next_needs_patching = !next_field->holder()->is_loaded() ||
2054 !next_field->will_link(method(), Bytecodes::_getfield) ||
2055 PatchALot;
2056 can_delay_access = C1UseDelayedFlattenedFieldReads && !next_needs_patching;
2057 }
2058 if (can_delay_access) {
2059 if (has_pending_load_indexed()) {
2060 pending_load_indexed()->update(field, offset - field->holder()->as_inline_klass()->first_field_offset());
2061 } else if (has_pending_field_access()) {
2062 pending_field_access()->inc_offset(offset - field->holder()->as_inline_klass()->first_field_offset());
2063 } else {
2064 null_check(obj);
2065 DelayedFieldAccess* dfa = new DelayedFieldAccess(obj, field->holder(), field->offset_in_bytes());
2066 set_pending_field_access(dfa);
2067 }
2068 } else {
2069 ciInlineKlass* inline_klass = field->type()->as_inline_klass();
2070 scope()->set_wrote_final();
2071 scope()->set_wrote_fields();
2072 bool need_membar = false;
2073 if (inline_klass->is_initialized() && inline_klass->is_empty()) {
2074 apush(append(new Constant(new InstanceConstant(inline_klass->default_instance()))));
2075 if (has_pending_field_access()) {
2076 set_pending_field_access(nullptr);
2077 } else if (has_pending_load_indexed()) {
2078 set_pending_load_indexed(nullptr);
2079 }
2080 } else if (has_pending_load_indexed()) {
2081 assert(!needs_patching, "Can't patch delayed field access");
2082 pending_load_indexed()->update(field, offset - field->holder()->as_inline_klass()->first_field_offset());
2083 NewInlineTypeInstance* vt = new NewInlineTypeInstance(inline_klass, pending_load_indexed()->state_before());
2084 _memory->new_instance(vt);
2085 pending_load_indexed()->load_instr()->set_vt(vt);
2086 apush(append_split(vt));
2087 append(pending_load_indexed()->load_instr());
2088 set_pending_load_indexed(nullptr);
2089 need_membar = true;
2090 } else {
2091 NewInlineTypeInstance* new_instance = new NewInlineTypeInstance(inline_klass, state_before);
2092 _memory->new_instance(new_instance);
2093 apush(append_split(new_instance));
2094 assert(!needs_patching, "Can't patch flat inline type field access");
2095 if (has_pending_field_access()) {
2096 copy_inline_content(inline_klass, pending_field_access()->obj(),
2097 pending_field_access()->offset() + field->offset_in_bytes() - field->holder()->as_inline_klass()->first_field_offset(),
2098 new_instance, inline_klass->first_field_offset(), state_before);
2099 set_pending_field_access(nullptr);
2100 } else {
2101 copy_inline_content(inline_klass, obj, field->offset_in_bytes(), new_instance, inline_klass->first_field_offset(), state_before);
2102 }
2103 need_membar = true;
2104 }
2105 if (need_membar) {
2106 // If we allocated a new instance ensure the stores to copy the
2107 // field contents are visible before any subsequent store that
2108 // publishes this reference.
2109 append(new MemBar(lir_membar_storestore));
2110 }
2111 }
2112 }
2113 }
2114 break;
2115 }
2116 case Bytecodes::_putfield: {
2117 Value val = pop(type);
2118 obj = apop();
2119 if (state_before == nullptr) {
2120 state_before = copy_state_for_exception();
2121 }
2122 if (field_type == T_BOOLEAN) {
2123 Value mask = append(new Constant(new IntConstant(1)));
2124 val = append(new LogicOp(Bytecodes::_iand, val, mask));
2125 }
2126 if (field->is_null_free() && field->type()->is_loaded() && field->type()->as_inline_klass()->is_empty()) {
2127 // Storing to a field of an empty inline type. Ignore.
2128 null_check(obj);
2129 } else if (!field->is_flat()) {
2130 StoreField* store = new StoreField(obj, offset, field, val, false, state_before, needs_patching);
2131 if (!needs_patching) store = _memory->store(store);
2132 if (store != nullptr) {
2133 append(store);
2134 }
2135 } else {
2136 assert(!needs_patching, "Can't patch flat inline type field access");
2137 ciInlineKlass* inline_klass = field->type()->as_inline_klass();
2138 copy_inline_content(inline_klass, val, inline_klass->first_field_offset(), obj, offset, state_before, field);
2139 }
2140 break;
2141 }
2142 default:
2143 ShouldNotReachHere();
2144 break;
2145 }
2146 }
2147
2148 // Baseline version of withfield, allocate every time
2149 void GraphBuilder::withfield(int field_index) {
2150 // Save the entire state and re-execute on deopt
2151 ValueStack* state_before = copy_state_before();
2152 state_before->set_should_reexecute(true);
2153
2154 bool will_link;
2155 ciField* field_modify = stream()->get_field(will_link);
2156 ciInstanceKlass* holder = field_modify->holder();
2157 BasicType field_type = field_modify->type()->basic_type();
2158 ValueType* type = as_ValueType(field_type);
2159 Value val = pop(type);
2160 Value obj = apop();
2161 null_check(obj);
2162
2163 if (!holder->is_loaded() || !holder->is_inlinetype() || !will_link) {
2164 apush(append_split(new Deoptimize(holder, state_before)));
2165 return;
2166 }
2167
2168 // call will_link again to determine if the field is valid.
2169 const bool needs_patching = !field_modify->will_link(method(), Bytecodes::_withfield) ||
2170 (!field_modify->is_flat() && PatchALot);
2171 const int offset_modify = !needs_patching ? field_modify->offset_in_bytes() : -1;
2172
2173 scope()->set_wrote_final();
2174 scope()->set_wrote_fields();
2175
2176 NewInlineTypeInstance* new_instance;
2177 if (obj->as_NewInlineTypeInstance() != nullptr && obj->as_NewInlineTypeInstance()->in_larval_state()) {
2178 new_instance = obj->as_NewInlineTypeInstance();
2179 apush(append_split(new_instance));
2180 } else {
2181 new_instance = new NewInlineTypeInstance(holder->as_inline_klass(), state_before);
2182 _memory->new_instance(new_instance);
2183 apush(append_split(new_instance));
2184
2185 // Initialize fields which are not modified
2186 for (int i = 0; i < holder->nof_nonstatic_fields(); i++) {
2187 ciField* field = holder->nonstatic_field_at(i);
2188 int offset = field->offset_in_bytes();
2189 // Don't use offset_modify here, it might be set to -1 if needs_patching
2190 if (offset != field_modify->offset_in_bytes()) {
2191 if (field->is_flat()) {
2192 ciInlineKlass* vk = field->type()->as_inline_klass();
2193 if (!vk->is_empty()) {
2194 copy_inline_content(vk, obj, offset, new_instance, vk->first_field_offset(), state_before, field);
2195 }
2196 } else {
2197 LoadField* load = new LoadField(obj, offset, field, false, state_before, false);
2198 Value replacement = append(load);
2199 StoreField* store = new StoreField(new_instance, offset, field, replacement, false, state_before, false);
2200 append(store);
2201 }
2202 }
2203 }
2204 }
2205
2206 // Field to modify
2207 if (field_type == T_BOOLEAN) {
2208 Value mask = append(new Constant(new IntConstant(1)));
2209 val = append(new LogicOp(Bytecodes::_iand, val, mask));
2210 }
2211 if (field_modify->is_flat()) {
2212 assert(!needs_patching, "Can't patch flat inline type field access");
2213 ciInlineKlass* vk = field_modify->type()->as_inline_klass();
2214 if (!vk->is_empty()) {
2215 copy_inline_content(vk, val, vk->first_field_offset(), new_instance, offset_modify, state_before, field_modify);
2216 }
2217 } else {
2218 StoreField* store = new StoreField(new_instance, offset_modify, field_modify, val, false, state_before, needs_patching);
2219 append(store);
2220 }
2221 }
2222
2223 Dependencies* GraphBuilder::dependency_recorder() const {
2224 assert(DeoptC1, "need debug information");
2225 return compilation()->dependency_recorder();
2226 }
2227
2228 // How many arguments do we want to profile?
2229 Values* GraphBuilder::args_list_for_profiling(ciMethod* target, int& start, bool may_have_receiver) {
2230 int n = 0;
2231 bool has_receiver = may_have_receiver && Bytecodes::has_receiver(method()->java_code_at_bci(bci()));
2232 start = has_receiver ? 1 : 0;
2233 if (profile_arguments()) {
2234 ciProfileData* data = method()->method_data()->bci_to_data(bci());
2235 if (data != nullptr && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) {
2236 n = data->is_CallTypeData() ? data->as_CallTypeData()->number_of_arguments() : data->as_VirtualCallTypeData()->number_of_arguments();
2237 }
2238 }
2239 // If we are inlining then we need to collect arguments to profile parameters for the target
2240 if (profile_parameters() && target != nullptr) {
2241 if (target->method_data() != nullptr && target->method_data()->parameters_type_data() != nullptr) {
2242 // The receiver is profiled on method entry so it's included in
2243 // the number of parameters but here we're only interested in
2244 // actual arguments.
2245 n = MAX2(n, target->method_data()->parameters_type_data()->number_of_parameters() - start);
2246 }
2247 }
2248 if (n > 0) {
2249 return new Values(n);
2250 }
2251 return nullptr;
2252 }
2253
2254 void GraphBuilder::check_args_for_profiling(Values* obj_args, int expected) {
2255 #ifdef ASSERT
2256 bool ignored_will_link;
2257 ciSignature* declared_signature = nullptr;
2258 ciMethod* real_target = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature);
2259 assert(expected == obj_args->capacity() || real_target->is_method_handle_intrinsic(), "missed on arg?");
2260 #endif
2261 }
2262
2263 // Collect arguments that we want to profile in a list
2264 Values* GraphBuilder::collect_args_for_profiling(Values* args, ciMethod* target, bool may_have_receiver) {
2265 int start = 0;
2266 Values* obj_args = args_list_for_profiling(target, start, may_have_receiver);
2267 if (obj_args == nullptr) {
2268 return nullptr;
2269 }
2270 int s = obj_args->capacity();
2271 // if called through method handle invoke, some arguments may have been popped
2272 for (int i = start, j = 0; j < s && i < args->length(); i++) {
2273 if (args->at(i)->type()->is_object_kind()) {
2274 obj_args->push(args->at(i));
2275 j++;
2276 }
2277 }
2278 check_args_for_profiling(obj_args, s);
2279 return obj_args;
2280 }
2281
2282 void GraphBuilder::invoke(Bytecodes::Code code) {
2283 bool will_link;
2284 ciSignature* declared_signature = nullptr;
2285 ciMethod* target = stream()->get_method(will_link, &declared_signature);
2286 ciKlass* holder = stream()->get_declared_method_holder();
2287 const Bytecodes::Code bc_raw = stream()->cur_bc_raw();
2288 assert(declared_signature != nullptr, "cannot be null");
2289 assert(will_link == target->is_loaded(), "");
2290 JFR_ONLY(Jfr::on_resolution(this, holder, target); CHECK_BAILOUT();)
2291
2292 ciInstanceKlass* klass = target->holder();
2293 assert(!target->is_loaded() || klass->is_loaded(), "loaded target must imply loaded klass");
2294
2295 // check if CHA possible: if so, change the code to invoke_special
2296 ciInstanceKlass* calling_klass = method()->holder();
2297 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder);
2298 ciInstanceKlass* actual_recv = callee_holder;
2299
2300 CompileLog* log = compilation()->log();
2301 if (log != nullptr)
2302 log->elem("call method='%d' instr='%s'",
2303 log->identify(target),
2304 Bytecodes::name(code));
2305
2306 // Some methods are obviously bindable without any type checks so
2307 // convert them directly to an invokespecial or invokestatic.
2308 if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) {
2309 switch (bc_raw) {
2310 case Bytecodes::_invokeinterface:
2311 // convert to invokespecial if the target is the private interface method.
2312 if (target->is_private()) {
2313 assert(holder->is_interface(), "How did we get a non-interface method here!");
2314 code = Bytecodes::_invokespecial;
2315 }
2316 break;
2317 case Bytecodes::_invokevirtual:
2318 code = Bytecodes::_invokespecial;
2319 break;
2320 case Bytecodes::_invokehandle:
2321 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial;
2322 break;
2323 default:
2324 break;
2325 }
2326 } else {
2327 if (bc_raw == Bytecodes::_invokehandle) {
2328 assert(!will_link, "should come here only for unlinked call");
2329 code = Bytecodes::_invokespecial;
2330 }
2331 }
2332
2333 if (code == Bytecodes::_invokespecial) {
2334 // Additional receiver subtype checks for interface calls via invokespecial or invokeinterface.
2335 ciKlass* receiver_constraint = nullptr;
2336
2337 if (bc_raw == Bytecodes::_invokeinterface) {
2338 receiver_constraint = holder;
2339 } else if (bc_raw == Bytecodes::_invokespecial && !target->is_object_constructor() && calling_klass->is_interface()) {
2340 receiver_constraint = calling_klass;
2341 }
2342
2343 if (receiver_constraint != nullptr) {
2344 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
2345 Value receiver = state()->stack_at(index);
2346 CheckCast* c = new CheckCast(receiver_constraint, receiver, copy_state_before());
2347 // go to uncommon_trap when checkcast fails
2348 c->set_invokespecial_receiver_check();
2349 state()->stack_at_put(index, append_split(c));
2350 }
2351 }
2352
2353 // Push appendix argument (MethodType, CallSite, etc.), if one.
2354 bool patch_for_appendix = false;
2355 int patching_appendix_arg = 0;
2356 if (Bytecodes::has_optional_appendix(bc_raw) && (!will_link || PatchALot)) {
2357 Value arg = append(new Constant(new ObjectConstant(compilation()->env()->unloaded_ciinstance()), copy_state_before()));
2358 apush(arg);
2359 patch_for_appendix = true;
2360 patching_appendix_arg = (will_link && stream()->has_appendix()) ? 0 : 1;
2361 } else if (stream()->has_appendix()) {
2362 ciObject* appendix = stream()->get_appendix();
2363 Value arg = append(new Constant(new ObjectConstant(appendix)));
2364 apush(arg);
2365 }
2366
2367 ciMethod* cha_monomorphic_target = nullptr;
2368 ciMethod* exact_target = nullptr;
2369 Value better_receiver = nullptr;
2370 if (UseCHA && DeoptC1 && target->is_loaded() &&
2371 !(// %%% FIXME: Are both of these relevant?
2372 target->is_method_handle_intrinsic() ||
2373 target->is_compiled_lambda_form()) &&
2374 !patch_for_appendix) {
2375 Value receiver = nullptr;
2376 ciInstanceKlass* receiver_klass = nullptr;
2377 bool type_is_exact = false;
2378 // try to find a precise receiver type
2379 if (will_link && !target->is_static()) {
2380 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
2381 receiver = state()->stack_at(index);
2382 ciType* type = receiver->exact_type();
2383 if (type != nullptr && type->is_loaded() &&
2384 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
2385 receiver_klass = (ciInstanceKlass*) type;
2386 type_is_exact = true;
2387 }
2388 if (type == nullptr) {
2389 type = receiver->declared_type();
2390 if (type != nullptr && type->is_loaded() &&
2391 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
2392 receiver_klass = (ciInstanceKlass*) type;
2393 if (receiver_klass->is_leaf_type() && !receiver_klass->is_final()) {
2394 // Insert a dependency on this type since
2395 // find_monomorphic_target may assume it's already done.
2396 dependency_recorder()->assert_leaf_type(receiver_klass);
2397 type_is_exact = true;
2398 }
2399 }
2400 }
2401 }
2402 if (receiver_klass != nullptr && type_is_exact &&
2403 receiver_klass->is_loaded() && code != Bytecodes::_invokespecial) {
2404 // If we have the exact receiver type we can bind directly to
2405 // the method to call.
2406 exact_target = target->resolve_invoke(calling_klass, receiver_klass);
2407 if (exact_target != nullptr) {
2408 target = exact_target;
2409 code = Bytecodes::_invokespecial;
2410 }
2411 }
2412 if (receiver_klass != nullptr &&
2413 receiver_klass->is_subtype_of(actual_recv) &&
2414 actual_recv->is_initialized()) {
2415 actual_recv = receiver_klass;
2416 }
2417
2418 if ((code == Bytecodes::_invokevirtual && callee_holder->is_initialized()) ||
2419 (code == Bytecodes::_invokeinterface && callee_holder->is_initialized() && !actual_recv->is_interface())) {
2420 // Use CHA on the receiver to select a more precise method.
2421 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv);
2422 } else if (code == Bytecodes::_invokeinterface && callee_holder->is_loaded() && receiver != nullptr) {
2423 assert(callee_holder->is_interface(), "invokeinterface to non interface?");
2424 // If there is only one implementor of this interface then we
2425 // may be able bind this invoke directly to the implementing
2426 // klass but we need both a dependence on the single interface
2427 // and on the method we bind to. Additionally since all we know
2428 // about the receiver type is the it's supposed to implement the
2429 // interface we have to insert a check that it's the class we
2430 // expect. Interface types are not checked by the verifier so
2431 // they are roughly equivalent to Object.
2432 // The number of implementors for declared_interface is less or
2433 // equal to the number of implementors for target->holder() so
2434 // if number of implementors of target->holder() == 1 then
2435 // number of implementors for decl_interface is 0 or 1. If
2436 // it's 0 then no class implements decl_interface and there's
2437 // no point in inlining.
2438 ciInstanceKlass* declared_interface = callee_holder;
2439 ciInstanceKlass* singleton = declared_interface->unique_implementor();
2440 if (singleton != nullptr) {
2441 assert(singleton != declared_interface, "not a unique implementor");
2442 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, declared_interface, singleton);
2443 if (cha_monomorphic_target != nullptr) {
2444 if (cha_monomorphic_target->holder() != compilation()->env()->Object_klass()) {
2445 ciInstanceKlass* holder = cha_monomorphic_target->holder();
2446 ciInstanceKlass* constraint = (holder->is_subtype_of(singleton) ? holder : singleton); // avoid upcasts
2447 actual_recv = declared_interface;
2448
2449 // insert a check it's really the expected class.
2450 CheckCast* c = new CheckCast(constraint, receiver, copy_state_for_exception());
2451 c->set_incompatible_class_change_check();
2452 c->set_direct_compare(constraint->is_final());
2453 // pass the result of the checkcast so that the compiler has
2454 // more accurate type info in the inlinee
2455 better_receiver = append_split(c);
2456
2457 dependency_recorder()->assert_unique_implementor(declared_interface, singleton);
2458 } else {
2459 cha_monomorphic_target = nullptr; // subtype check against Object is useless
2460 }
2461 }
2462 }
2463 }
2464 }
2465
2466 if (cha_monomorphic_target != nullptr) {
2467 assert(!target->can_be_statically_bound() || target == cha_monomorphic_target, "");
2468 assert(!cha_monomorphic_target->is_abstract(), "");
2469 if (!cha_monomorphic_target->can_be_statically_bound(actual_recv)) {
2470 // If we inlined because CHA revealed only a single target method,
2471 // then we are dependent on that target method not getting overridden
2472 // by dynamic class loading. Be sure to test the "static" receiver
2473 // dest_method here, as opposed to the actual receiver, which may
2474 // falsely lead us to believe that the receiver is final or private.
2475 dependency_recorder()->assert_unique_concrete_method(actual_recv, cha_monomorphic_target, callee_holder, target);
2476 }
2477 code = Bytecodes::_invokespecial;
2478 }
2479
2480 // check if we could do inlining
2481 if (!PatchALot && Inline && target->is_loaded() && !patch_for_appendix &&
2482 callee_holder->is_loaded()) { // the effect of symbolic reference resolution
2483
2484 // callee is known => check if we have static binding
2485 if ((code == Bytecodes::_invokestatic && klass->is_initialized()) || // invokestatic involves an initialization barrier on declaring class
2486 code == Bytecodes::_invokespecial ||
2487 (code == Bytecodes::_invokevirtual && target->is_final_method()) ||
2488 code == Bytecodes::_invokedynamic) {
2489 // static binding => check if callee is ok
2490 ciMethod* inline_target = (cha_monomorphic_target != nullptr) ? cha_monomorphic_target : target;
2491 bool holder_known = (cha_monomorphic_target != nullptr) || (exact_target != nullptr);
2492 bool success = try_inline(inline_target, holder_known, false /* ignore_return */, code, better_receiver);
2493
2494 CHECK_BAILOUT();
2495 clear_inline_bailout();
2496
2497 if (success) {
2498 // Register dependence if JVMTI has either breakpoint
2499 // setting or hotswapping of methods capabilities since they may
2500 // cause deoptimization.
2501 if (compilation()->env()->jvmti_can_hotswap_or_post_breakpoint()) {
2502 dependency_recorder()->assert_evol_method(inline_target);
2503 }
2504 return;
2505 }
2506 } else {
2507 print_inlining(target, "no static binding", /*success*/ false);
2508 }
2509 } else {
2510 print_inlining(target, "not inlineable", /*success*/ false);
2511 }
2512
2513 // If we attempted an inline which did not succeed because of a
2514 // bailout during construction of the callee graph, the entire
2515 // compilation has to be aborted. This is fairly rare and currently
2516 // seems to only occur for jasm-generated classes which contain
2517 // jsr/ret pairs which are not associated with finally clauses and
2518 // do not have exception handlers in the containing method, and are
2519 // therefore not caught early enough to abort the inlining without
2520 // corrupting the graph. (We currently bail out with a non-empty
2521 // stack at a ret in these situations.)
2522 CHECK_BAILOUT();
2523
2524 // inlining not successful => standard invoke
2525 ValueType* result_type = as_ValueType(declared_signature->return_type());
2526 ValueStack* state_before = copy_state_exhandling();
2527
2528 // The bytecode (code) might change in this method so we are checking this very late.
2529 const bool has_receiver =
2530 code == Bytecodes::_invokespecial ||
2531 code == Bytecodes::_invokevirtual ||
2532 code == Bytecodes::_invokeinterface;
2533 Values* args = state()->pop_arguments(target->arg_size_no_receiver() + patching_appendix_arg);
2534 Value recv = has_receiver ? apop() : nullptr;
2535
2536 // A null check is required here (when there is a receiver) for any of the following cases
2537 // - invokespecial, always need a null check.
2538 // - invokevirtual, when the target is final and loaded. Calls to final targets will become optimized
2539 // and require null checking. If the target is loaded a null check is emitted here.
2540 // If the target isn't loaded the null check must happen after the call resolution. We achieve that
2541 // by using the target methods unverified entry point (see CompiledIC::compute_monomorphic_entry).
2542 // (The JVM specification requires that LinkageError must be thrown before a NPE. An unloaded target may
2543 // potentially fail, and can't have the null check before the resolution.)
2544 // - A call that will be profiled. (But we can't add a null check when the target is unloaded, by the same
2545 // reason as above, so calls with a receiver to unloaded targets can't be profiled.)
2546 //
2547 // Normal invokevirtual will perform the null check during lookup
2548
2549 bool need_null_check = (code == Bytecodes::_invokespecial) ||
2550 (target->is_loaded() && (target->is_final_method() || (is_profiling() && profile_calls())));
2551
2552 if (need_null_check) {
2553 if (recv != nullptr) {
2554 null_check(recv);
2555 }
2556
2557 if (is_profiling()) {
2558 // Note that we'd collect profile data in this method if we wanted it.
2559 compilation()->set_would_profile(true);
2560
2561 if (profile_calls()) {
2562 assert(cha_monomorphic_target == nullptr || exact_target == nullptr, "both can not be set");
2563 ciKlass* target_klass = nullptr;
2564 if (cha_monomorphic_target != nullptr) {
2565 target_klass = cha_monomorphic_target->holder();
2566 } else if (exact_target != nullptr) {
2567 target_klass = exact_target->holder();
2568 }
2569 profile_call(target, recv, target_klass, collect_args_for_profiling(args, nullptr, false), false);
2570 }
2571 }
2572 }
2573
2574 Invoke* result = new Invoke(code, result_type, recv, args, target, state_before,
2575 declared_signature->returns_null_free_inline_type());
2576 // push result
2577 append_split(result);
2578
2579 if (result_type != voidType) {
2580 push(result_type, round_fp(result));
2581 }
2582 if (profile_return() && result_type->is_object_kind()) {
2583 profile_return_type(result, target);
2584 }
2585 }
2586
2587
2588 void GraphBuilder::new_instance(int klass_index) {
2589 ValueStack* state_before = copy_state_exhandling();
2590 ciKlass* klass = stream()->get_klass();
2591 assert(klass->is_instance_klass(), "must be an instance klass");
2592 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before, stream()->is_unresolved_klass());
2593 _memory->new_instance(new_instance);
2594 apush(append_split(new_instance));
2595 }
2596
2597 void GraphBuilder::default_value(int klass_index) {
2598 bool will_link;
2599 ciKlass* klass = stream()->get_klass(will_link);
2600 if (!stream()->is_unresolved_klass() && klass->is_inlinetype() &&
2601 klass->as_inline_klass()->is_initialized()) {
2602 ciInlineKlass* vk = klass->as_inline_klass();
2603 apush(append(new Constant(new InstanceConstant(vk->default_instance()))));
2604 } else {
2605 apush(append_split(new Deoptimize(klass, copy_state_before())));
2606 }
2607 }
2608
2609 void GraphBuilder::new_type_array() {
2610 ValueStack* state_before = copy_state_exhandling();
2611 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before)));
2612 }
2613
2614
2615 void GraphBuilder::new_object_array() {
2616 ciKlass* klass = stream()->get_klass();
2617 bool null_free = stream()->has_Q_signature();
2618 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2619 NewArray* n = new NewObjectArray(klass, ipop(), state_before, null_free);
2620 apush(append_split(n));
2621 }
2622
2623
2624 bool GraphBuilder::direct_compare(ciKlass* k) {
2625 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) {
2626 ciInstanceKlass* ik = k->as_instance_klass();
2627 if (ik->is_final()) {
2628 return true;
2629 } else {
2630 if (DeoptC1 && UseCHA && !(ik->has_subklass() || ik->is_interface())) {
2631 // test class is leaf class
2632 dependency_recorder()->assert_leaf_type(ik);
2633 return true;
2634 }
2635 }
2636 }
2637 return false;
2638 }
2639
2640
2641 void GraphBuilder::check_cast(int klass_index) {
2642 ciKlass* klass = stream()->get_klass();
2643 bool null_free = stream()->has_Q_signature();
2644 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_for_exception();
2645 CheckCast* c = new CheckCast(klass, apop(), state_before, null_free);
2646 apush(append_split(c));
2647 c->set_direct_compare(direct_compare(klass));
2648
2649 if (is_profiling()) {
2650 // Note that we'd collect profile data in this method if we wanted it.
2651 compilation()->set_would_profile(true);
2652
2653 if (profile_checkcasts()) {
2654 c->set_profiled_method(method());
2655 c->set_profiled_bci(bci());
2656 c->set_should_profile(true);
2657 }
2658 }
2659 }
2660
2661
2662 void GraphBuilder::instance_of(int klass_index) {
2663 ciKlass* klass = stream()->get_klass();
2664 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2665 InstanceOf* i = new InstanceOf(klass, apop(), state_before);
2666 ipush(append_split(i));
2667 i->set_direct_compare(direct_compare(klass));
2668
2669 if (is_profiling()) {
2670 // Note that we'd collect profile data in this method if we wanted it.
2671 compilation()->set_would_profile(true);
2672
2673 if (profile_checkcasts()) {
2674 i->set_profiled_method(method());
2675 i->set_profiled_bci(bci());
2676 i->set_should_profile(true);
2677 }
2678 }
2679 }
2680
2681
2682 void GraphBuilder::monitorenter(Value x, int bci) {
2683 bool maybe_inlinetype = false;
2684 if (bci == InvocationEntryBci) {
2685 // Called by GraphBuilder::inline_sync_entry.
2686 #ifdef ASSERT
2687 ciType* obj_type = x->declared_type();
2688 assert(obj_type == nullptr || !obj_type->is_inlinetype(), "inline types cannot have synchronized methods");
2689 #endif
2690 } else {
2691 // We are compiling a monitorenter bytecode
2692 if (EnableValhalla) {
2693 ciType* obj_type = x->declared_type();
2694 if (obj_type == nullptr || obj_type->as_klass()->can_be_inline_klass()) {
2695 // If we're (possibly) locking on an inline type, check for markWord::always_locked_pattern
2696 // and throw IMSE. (obj_type is null for Phi nodes, so let's just be conservative).
2697 maybe_inlinetype = true;
2698 }
2699 }
2700 }
2701
2702 // save state before locking in case of deoptimization after a NullPointerException
2703 ValueStack* state_before = copy_state_for_exception_with_bci(bci);
2704 compilation()->set_has_monitors(true);
2705 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before, maybe_inlinetype), bci);
2706 kill_all();
2707 }
2708
2709
2710 void GraphBuilder::monitorexit(Value x, int bci) {
2711 append_with_bci(new MonitorExit(x, state()->unlock()), bci);
2712 kill_all();
2713 }
2714
2715
2716 void GraphBuilder::new_multi_array(int dimensions) {
2717 ciKlass* klass = stream()->get_klass();
2718 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2719
2720 Values* dims = new Values(dimensions, dimensions, nullptr);
2721 // fill in all dimensions
2722 int i = dimensions;
2723 while (i-- > 0) dims->at_put(i, ipop());
2724 // create array
2725 NewArray* n = new NewMultiArray(klass, dims, state_before);
2726 apush(append_split(n));
2727 }
2728
2729
2730 void GraphBuilder::throw_op(int bci) {
2731 // We require that the debug info for a Throw be the "state before"
2732 // the Throw (i.e., exception oop is still on TOS)
2733 ValueStack* state_before = copy_state_before_with_bci(bci);
2734 Throw* t = new Throw(apop(), state_before);
2735 // operand stack not needed after a throw
2736 state()->truncate_stack(0);
2737 append_with_bci(t, bci);
2738 }
2739
2740
2741 Value GraphBuilder::round_fp(Value fp_value) {
2742 if (strict_fp_requires_explicit_rounding) {
2743 #ifdef IA32
2744 // no rounding needed if SSE2 is used
2745 if (UseSSE < 2) {
2746 // Must currently insert rounding node for doubleword values that
2747 // are results of expressions (i.e., not loads from memory or
2748 // constants)
2749 if (fp_value->type()->tag() == doubleTag &&
2750 fp_value->as_Constant() == nullptr &&
2751 fp_value->as_Local() == nullptr && // method parameters need no rounding
2752 fp_value->as_RoundFP() == nullptr) {
2753 return append(new RoundFP(fp_value));
2754 }
2755 }
2756 #else
2757 Unimplemented();
2758 #endif // IA32
2759 }
2760 return fp_value;
2761 }
2762
2763
2764 Instruction* GraphBuilder::append_with_bci(Instruction* instr, int bci) {
2765 Canonicalizer canon(compilation(), instr, bci);
2766 Instruction* i1 = canon.canonical();
2767 if (i1->is_linked() || !i1->can_be_linked()) {
2768 // Canonicalizer returned an instruction which was already
2769 // appended so simply return it.
2770 return i1;
2771 }
2772
2773 if (UseLocalValueNumbering) {
2774 // Lookup the instruction in the ValueMap and add it to the map if
2775 // it's not found.
2776 Instruction* i2 = vmap()->find_insert(i1);
2777 if (i2 != i1) {
2778 // found an entry in the value map, so just return it.
2779 assert(i2->is_linked(), "should already be linked");
2780 return i2;
2781 }
2782 ValueNumberingEffects vne(vmap());
2783 i1->visit(&vne);
2784 }
2785
2786 // i1 was not eliminated => append it
2787 assert(i1->next() == nullptr, "shouldn't already be linked");
2788 _last = _last->set_next(i1, canon.bci());
2789
2790 if (++_instruction_count >= InstructionCountCutoff && !bailed_out()) {
2791 // set the bailout state but complete normal processing. We
2792 // might do a little more work before noticing the bailout so we
2793 // want processing to continue normally until it's noticed.
2794 bailout("Method and/or inlining is too large");
2795 }
2796
2797 #ifndef PRODUCT
2798 if (PrintIRDuringConstruction) {
2799 InstructionPrinter ip;
2800 ip.print_line(i1);
2801 if (Verbose) {
2802 state()->print();
2803 }
2804 }
2805 #endif
2806
2807 // save state after modification of operand stack for StateSplit instructions
2808 StateSplit* s = i1->as_StateSplit();
2809 if (s != nullptr) {
2810 if (EliminateFieldAccess) {
2811 Intrinsic* intrinsic = s->as_Intrinsic();
2812 if (s->as_Invoke() != nullptr || (intrinsic && !intrinsic->preserves_state())) {
2813 _memory->kill();
2814 }
2815 }
2816 s->set_state(state()->copy(ValueStack::StateAfter, canon.bci()));
2817 }
2818
2819 // set up exception handlers for this instruction if necessary
2820 if (i1->can_trap()) {
2821 i1->set_exception_handlers(handle_exception(i1));
2822 assert(i1->exception_state() != nullptr || !i1->needs_exception_state() || bailed_out(), "handle_exception must set exception state");
2823 }
2824 return i1;
2825 }
2826
2827
2828 Instruction* GraphBuilder::append(Instruction* instr) {
2829 assert(instr->as_StateSplit() == nullptr || instr->as_BlockEnd() != nullptr, "wrong append used");
2830 return append_with_bci(instr, bci());
2831 }
2832
2833
2834 Instruction* GraphBuilder::append_split(StateSplit* instr) {
2835 return append_with_bci(instr, bci());
2836 }
2837
2838
2839 void GraphBuilder::null_check(Value value) {
2840 if (value->as_NewArray() != nullptr || value->as_NewInstance() != nullptr || value->as_NewInlineTypeInstance() != nullptr) {
2841 return;
2842 } else {
2843 Constant* con = value->as_Constant();
2844 if (con) {
2845 ObjectType* c = con->type()->as_ObjectType();
2846 if (c && c->is_loaded()) {
2847 ObjectConstant* oc = c->as_ObjectConstant();
2848 if (!oc || !oc->value()->is_null_object()) {
2849 return;
2850 }
2851 }
2852 }
2853 if (value->is_null_free()) return;
2854 }
2855 append(new NullCheck(value, copy_state_for_exception()));
2856 }
2857
2858
2859
2860 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) {
2861 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != nullptr)) {
2862 assert(instruction->exception_state() == nullptr
2863 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState
2864 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->should_retain_local_variables()),
2865 "exception_state should be of exception kind");
2866 return new XHandlers();
2867 }
2868
2869 XHandlers* exception_handlers = new XHandlers();
2870 ScopeData* cur_scope_data = scope_data();
2871 ValueStack* cur_state = instruction->state_before();
2872 ValueStack* prev_state = nullptr;
2873 int scope_count = 0;
2874
2875 assert(cur_state != nullptr, "state_before must be set");
2876 do {
2877 int cur_bci = cur_state->bci();
2878 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2879 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci()
2880 || has_pending_field_access() || has_pending_load_indexed(), "invalid bci");
2881
2882
2883 // join with all potential exception handlers
2884 XHandlers* list = cur_scope_data->xhandlers();
2885 const int n = list->length();
2886 for (int i = 0; i < n; i++) {
2887 XHandler* h = list->handler_at(i);
2888 if (h->covers(cur_bci)) {
2889 // h is a potential exception handler => join it
2890 compilation()->set_has_exception_handlers(true);
2891
2892 BlockBegin* entry = h->entry_block();
2893 if (entry == block()) {
2894 // It's acceptable for an exception handler to cover itself
2895 // but we don't handle that in the parser currently. It's
2896 // very rare so we bailout instead of trying to handle it.
2897 BAILOUT_("exception handler covers itself", exception_handlers);
2898 }
2899 assert(entry->bci() == h->handler_bci(), "must match");
2900 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond");
2901
2902 // previously this was a BAILOUT, but this is not necessary
2903 // now because asynchronous exceptions are not handled this way.
2904 assert(entry->state() == nullptr || cur_state->total_locks_size() == entry->state()->total_locks_size(), "locks do not match");
2905
2906 // xhandler start with an empty expression stack
2907 if (cur_state->stack_size() != 0) {
2908 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
2909 }
2910 if (instruction->exception_state() == nullptr) {
2911 instruction->set_exception_state(cur_state);
2912 }
2913
2914 // Note: Usually this join must work. However, very
2915 // complicated jsr-ret structures where we don't ret from
2916 // the subroutine can cause the objects on the monitor
2917 // stacks to not match because blocks can be parsed twice.
2918 // The only test case we've seen so far which exhibits this
2919 // problem is caught by the infinite recursion test in
2920 // GraphBuilder::jsr() if the join doesn't work.
2921 if (!entry->try_merge(cur_state, compilation()->has_irreducible_loops())) {
2922 BAILOUT_("error while joining with exception handler, prob. due to complicated jsr/rets", exception_handlers);
2923 }
2924
2925 // add current state for correct handling of phi functions at begin of xhandler
2926 int phi_operand = entry->add_exception_state(cur_state);
2927
2928 // add entry to the list of xhandlers of this block
2929 _block->add_exception_handler(entry);
2930
2931 // add back-edge from xhandler entry to this block
2932 if (!entry->is_predecessor(_block)) {
2933 entry->add_predecessor(_block);
2934 }
2935
2936 // clone XHandler because phi_operand and scope_count can not be shared
2937 XHandler* new_xhandler = new XHandler(h);
2938 new_xhandler->set_phi_operand(phi_operand);
2939 new_xhandler->set_scope_count(scope_count);
2940 exception_handlers->append(new_xhandler);
2941
2942 // fill in exception handler subgraph lazily
2943 assert(!entry->is_set(BlockBegin::was_visited_flag), "entry must not be visited yet");
2944 cur_scope_data->add_to_work_list(entry);
2945
2946 // stop when reaching catchall
2947 if (h->catch_type() == 0) {
2948 return exception_handlers;
2949 }
2950 }
2951 }
2952
2953 if (exception_handlers->length() == 0) {
2954 // This scope and all callees do not handle exceptions, so the local
2955 // variables of this scope are not needed. However, the scope itself is
2956 // required for a correct exception stack trace -> clear out the locals.
2957 if (_compilation->env()->should_retain_local_variables()) {
2958 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
2959 } else {
2960 cur_state = cur_state->copy(ValueStack::EmptyExceptionState, cur_state->bci());
2961 }
2962 if (prev_state != nullptr) {
2963 prev_state->set_caller_state(cur_state);
2964 }
2965 if (instruction->exception_state() == nullptr) {
2966 instruction->set_exception_state(cur_state);
2967 }
2968 }
2969
2970 // Set up iteration for next time.
2971 // If parsing a jsr, do not grab exception handlers from the
2972 // parent scopes for this method (already got them, and they
2973 // needed to be cloned)
2974
2975 while (cur_scope_data->parsing_jsr()) {
2976 cur_scope_data = cur_scope_data->parent();
2977 }
2978
2979 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2980 assert(cur_state->locks_size() == 0 || cur_state->locks_size() == 1, "unlocking must be done in a catchall exception handler");
2981
2982 prev_state = cur_state;
2983 cur_state = cur_state->caller_state();
2984 cur_scope_data = cur_scope_data->parent();
2985 scope_count++;
2986 } while (cur_scope_data != nullptr);
2987
2988 return exception_handlers;
2989 }
2990
2991
2992 // Helper class for simplifying Phis.
2993 class PhiSimplifier : public BlockClosure {
2994 private:
2995 bool _has_substitutions;
2996 Value simplify(Value v);
2997
2998 public:
2999 PhiSimplifier(BlockBegin* start) : _has_substitutions(false) {
3000 start->iterate_preorder(this);
3001 if (_has_substitutions) {
3002 SubstitutionResolver sr(start);
3003 }
3004 }
3005 void block_do(BlockBegin* b);
3006 bool has_substitutions() const { return _has_substitutions; }
3007 };
3008
3009
3010 Value PhiSimplifier::simplify(Value v) {
3011 Phi* phi = v->as_Phi();
3012
3013 if (phi == nullptr) {
3014 // no phi function
3015 return v;
3016 } else if (v->has_subst()) {
3017 // already substituted; subst can be phi itself -> simplify
3018 return simplify(v->subst());
3019 } else if (phi->is_set(Phi::cannot_simplify)) {
3020 // already tried to simplify phi before
3021 return phi;
3022 } else if (phi->is_set(Phi::visited)) {
3023 // break cycles in phi functions
3024 return phi;
3025 } else if (phi->type()->is_illegal()) {
3026 // illegal phi functions are ignored anyway
3027 return phi;
3028
3029 } else {
3030 // mark phi function as processed to break cycles in phi functions
3031 phi->set(Phi::visited);
3032
3033 // simplify x = [y, x] and x = [y, y] to y
3034 Value subst = nullptr;
3035 int opd_count = phi->operand_count();
3036 for (int i = 0; i < opd_count; i++) {
3037 Value opd = phi->operand_at(i);
3038 assert(opd != nullptr, "Operand must exist!");
3039
3040 if (opd->type()->is_illegal()) {
3041 // if one operand is illegal, the entire phi function is illegal
3042 phi->make_illegal();
3043 phi->clear(Phi::visited);
3044 return phi;
3045 }
3046
3047 Value new_opd = simplify(opd);
3048 assert(new_opd != nullptr, "Simplified operand must exist!");
3049
3050 if (new_opd != phi && new_opd != subst) {
3051 if (subst == nullptr) {
3052 subst = new_opd;
3053 } else {
3054 // no simplification possible
3055 phi->set(Phi::cannot_simplify);
3056 phi->clear(Phi::visited);
3057 return phi;
3058 }
3059 }
3060 }
3061
3062 // successfully simplified phi function
3063 assert(subst != nullptr, "illegal phi function");
3064 _has_substitutions = true;
3065 phi->clear(Phi::visited);
3066 phi->set_subst(subst);
3067
3068 #ifndef PRODUCT
3069 if (PrintPhiFunctions) {
3070 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());
3071 }
3072 #endif
3073
3074 return subst;
3075 }
3076 }
3077
3078
3079 void PhiSimplifier::block_do(BlockBegin* b) {
3080 for_each_phi_fun(b, phi,
3081 simplify(phi);
3082 );
3083
3084 #ifdef ASSERT
3085 for_each_phi_fun(b, phi,
3086 assert(phi->operand_count() != 1 || phi->subst() != phi || phi->is_illegal(), "missed trivial simplification");
3087 );
3088
3089 ValueStack* state = b->state()->caller_state();
3090 for_each_state_value(state, value,
3091 Phi* phi = value->as_Phi();
3092 assert(phi == nullptr || phi->block() != b, "must not have phi function to simplify in caller state");
3093 );
3094 #endif
3095 }
3096
3097 // This method is called after all blocks are filled with HIR instructions
3098 // It eliminates all Phi functions of the form x = [y, y] and x = [y, x]
3099 void GraphBuilder::eliminate_redundant_phis(BlockBegin* start) {
3100 PhiSimplifier simplifier(start);
3101 }
3102
3103
3104 void GraphBuilder::connect_to_end(BlockBegin* beg) {
3105 // setup iteration
3106 kill_all();
3107 _block = beg;
3108 _state = beg->state()->copy_for_parsing();
3109 _last = beg;
3110 iterate_bytecodes_for_block(beg->bci());
3111 }
3112
3113
3114 BlockEnd* GraphBuilder::iterate_bytecodes_for_block(int bci) {
3115 #ifndef PRODUCT
3116 if (PrintIRDuringConstruction) {
3117 tty->cr();
3118 InstructionPrinter ip;
3119 ip.print_instr(_block); tty->cr();
3120 ip.print_stack(_block->state()); tty->cr();
3121 ip.print_inline_level(_block);
3122 ip.print_head();
3123 tty->print_cr("locals size: %d stack size: %d", state()->locals_size(), state()->stack_size());
3124 }
3125 #endif
3126 _skip_block = false;
3127 assert(state() != nullptr, "ValueStack missing!");
3128 CompileLog* log = compilation()->log();
3129 ciBytecodeStream s(method());
3130 s.reset_to_bci(bci);
3131 int prev_bci = bci;
3132 scope_data()->set_stream(&s);
3133 // iterate
3134 Bytecodes::Code code = Bytecodes::_illegal;
3135 bool push_exception = false;
3136
3137 if (block()->is_set(BlockBegin::exception_entry_flag) && block()->next() == nullptr) {
3138 // first thing in the exception entry block should be the exception object.
3139 push_exception = true;
3140 }
3141
3142 bool ignore_return = scope_data()->ignore_return();
3143
3144 while (!bailed_out() && last()->as_BlockEnd() == nullptr &&
3145 (code = stream()->next()) != ciBytecodeStream::EOBC() &&
3146 (block_at(s.cur_bci()) == nullptr || block_at(s.cur_bci()) == block())) {
3147 assert(state()->kind() == ValueStack::Parsing, "invalid state kind");
3148
3149 if (log != nullptr)
3150 log->set_context("bc code='%d' bci='%d'", (int)code, s.cur_bci());
3151
3152 // Check for active jsr during OSR compilation
3153 if (compilation()->is_osr_compile()
3154 && scope()->is_top_scope()
3155 && parsing_jsr()
3156 && s.cur_bci() == compilation()->osr_bci()) {
3157 bailout("OSR not supported while a jsr is active");
3158 }
3159
3160 if (push_exception) {
3161 apush(append(new ExceptionObject()));
3162 push_exception = false;
3163 }
3164
3165 // handle bytecode
3166 switch (code) {
3167 case Bytecodes::_nop : /* nothing to do */ break;
3168 case Bytecodes::_aconst_null : apush(append(new Constant(objectNull ))); break;
3169 case Bytecodes::_iconst_m1 : ipush(append(new Constant(new IntConstant (-1)))); break;
3170 case Bytecodes::_iconst_0 : ipush(append(new Constant(intZero ))); break;
3171 case Bytecodes::_iconst_1 : ipush(append(new Constant(intOne ))); break;
3172 case Bytecodes::_iconst_2 : ipush(append(new Constant(new IntConstant ( 2)))); break;
3173 case Bytecodes::_iconst_3 : ipush(append(new Constant(new IntConstant ( 3)))); break;
3174 case Bytecodes::_iconst_4 : ipush(append(new Constant(new IntConstant ( 4)))); break;
3175 case Bytecodes::_iconst_5 : ipush(append(new Constant(new IntConstant ( 5)))); break;
3176 case Bytecodes::_lconst_0 : lpush(append(new Constant(new LongConstant ( 0)))); break;
3177 case Bytecodes::_lconst_1 : lpush(append(new Constant(new LongConstant ( 1)))); break;
3178 case Bytecodes::_fconst_0 : fpush(append(new Constant(new FloatConstant ( 0)))); break;
3179 case Bytecodes::_fconst_1 : fpush(append(new Constant(new FloatConstant ( 1)))); break;
3180 case Bytecodes::_fconst_2 : fpush(append(new Constant(new FloatConstant ( 2)))); break;
3181 case Bytecodes::_dconst_0 : dpush(append(new Constant(new DoubleConstant( 0)))); break;
3182 case Bytecodes::_dconst_1 : dpush(append(new Constant(new DoubleConstant( 1)))); break;
3183 case Bytecodes::_bipush : ipush(append(new Constant(new IntConstant(((signed char*)s.cur_bcp())[1])))); break;
3184 case Bytecodes::_sipush : ipush(append(new Constant(new IntConstant((short)Bytes::get_Java_u2(s.cur_bcp()+1))))); break;
3185 case Bytecodes::_ldc : // fall through
3186 case Bytecodes::_ldc_w : // fall through
3187 case Bytecodes::_ldc2_w : load_constant(); break;
3188 case Bytecodes::_iload : load_local(intType , s.get_index()); break;
3189 case Bytecodes::_lload : load_local(longType , s.get_index()); break;
3190 case Bytecodes::_fload : load_local(floatType , s.get_index()); break;
3191 case Bytecodes::_dload : load_local(doubleType , s.get_index()); break;
3192 case Bytecodes::_aload : load_local(instanceType, s.get_index()); break;
3193 case Bytecodes::_iload_0 : load_local(intType , 0); break;
3194 case Bytecodes::_iload_1 : load_local(intType , 1); break;
3195 case Bytecodes::_iload_2 : load_local(intType , 2); break;
3196 case Bytecodes::_iload_3 : load_local(intType , 3); break;
3197 case Bytecodes::_lload_0 : load_local(longType , 0); break;
3198 case Bytecodes::_lload_1 : load_local(longType , 1); break;
3199 case Bytecodes::_lload_2 : load_local(longType , 2); break;
3200 case Bytecodes::_lload_3 : load_local(longType , 3); break;
3201 case Bytecodes::_fload_0 : load_local(floatType , 0); break;
3202 case Bytecodes::_fload_1 : load_local(floatType , 1); break;
3203 case Bytecodes::_fload_2 : load_local(floatType , 2); break;
3204 case Bytecodes::_fload_3 : load_local(floatType , 3); break;
3205 case Bytecodes::_dload_0 : load_local(doubleType, 0); break;
3206 case Bytecodes::_dload_1 : load_local(doubleType, 1); break;
3207 case Bytecodes::_dload_2 : load_local(doubleType, 2); break;
3208 case Bytecodes::_dload_3 : load_local(doubleType, 3); break;
3209 case Bytecodes::_aload_0 : load_local(objectType, 0); break;
3210 case Bytecodes::_aload_1 : load_local(objectType, 1); break;
3211 case Bytecodes::_aload_2 : load_local(objectType, 2); break;
3212 case Bytecodes::_aload_3 : load_local(objectType, 3); break;
3213 case Bytecodes::_iaload : load_indexed(T_INT ); break;
3214 case Bytecodes::_laload : load_indexed(T_LONG ); break;
3215 case Bytecodes::_faload : load_indexed(T_FLOAT ); break;
3216 case Bytecodes::_daload : load_indexed(T_DOUBLE); break;
3217 case Bytecodes::_aaload : load_indexed(T_OBJECT); break;
3218 case Bytecodes::_baload : load_indexed(T_BYTE ); break;
3219 case Bytecodes::_caload : load_indexed(T_CHAR ); break;
3220 case Bytecodes::_saload : load_indexed(T_SHORT ); break;
3221 case Bytecodes::_istore : store_local(intType , s.get_index()); break;
3222 case Bytecodes::_lstore : store_local(longType , s.get_index()); break;
3223 case Bytecodes::_fstore : store_local(floatType , s.get_index()); break;
3224 case Bytecodes::_dstore : store_local(doubleType, s.get_index()); break;
3225 case Bytecodes::_astore : store_local(objectType, s.get_index()); break;
3226 case Bytecodes::_istore_0 : store_local(intType , 0); break;
3227 case Bytecodes::_istore_1 : store_local(intType , 1); break;
3228 case Bytecodes::_istore_2 : store_local(intType , 2); break;
3229 case Bytecodes::_istore_3 : store_local(intType , 3); break;
3230 case Bytecodes::_lstore_0 : store_local(longType , 0); break;
3231 case Bytecodes::_lstore_1 : store_local(longType , 1); break;
3232 case Bytecodes::_lstore_2 : store_local(longType , 2); break;
3233 case Bytecodes::_lstore_3 : store_local(longType , 3); break;
3234 case Bytecodes::_fstore_0 : store_local(floatType , 0); break;
3235 case Bytecodes::_fstore_1 : store_local(floatType , 1); break;
3236 case Bytecodes::_fstore_2 : store_local(floatType , 2); break;
3237 case Bytecodes::_fstore_3 : store_local(floatType , 3); break;
3238 case Bytecodes::_dstore_0 : store_local(doubleType, 0); break;
3239 case Bytecodes::_dstore_1 : store_local(doubleType, 1); break;
3240 case Bytecodes::_dstore_2 : store_local(doubleType, 2); break;
3241 case Bytecodes::_dstore_3 : store_local(doubleType, 3); break;
3242 case Bytecodes::_astore_0 : store_local(objectType, 0); break;
3243 case Bytecodes::_astore_1 : store_local(objectType, 1); break;
3244 case Bytecodes::_astore_2 : store_local(objectType, 2); break;
3245 case Bytecodes::_astore_3 : store_local(objectType, 3); break;
3246 case Bytecodes::_iastore : store_indexed(T_INT ); break;
3247 case Bytecodes::_lastore : store_indexed(T_LONG ); break;
3248 case Bytecodes::_fastore : store_indexed(T_FLOAT ); break;
3249 case Bytecodes::_dastore : store_indexed(T_DOUBLE); break;
3250 case Bytecodes::_aastore : store_indexed(T_OBJECT); break;
3251 case Bytecodes::_bastore : store_indexed(T_BYTE ); break;
3252 case Bytecodes::_castore : store_indexed(T_CHAR ); break;
3253 case Bytecodes::_sastore : store_indexed(T_SHORT ); break;
3254 case Bytecodes::_pop : // fall through
3255 case Bytecodes::_pop2 : // fall through
3256 case Bytecodes::_dup : // fall through
3257 case Bytecodes::_dup_x1 : // fall through
3258 case Bytecodes::_dup_x2 : // fall through
3259 case Bytecodes::_dup2 : // fall through
3260 case Bytecodes::_dup2_x1 : // fall through
3261 case Bytecodes::_dup2_x2 : // fall through
3262 case Bytecodes::_swap : stack_op(code); break;
3263 case Bytecodes::_iadd : arithmetic_op(intType , code); break;
3264 case Bytecodes::_ladd : arithmetic_op(longType , code); break;
3265 case Bytecodes::_fadd : arithmetic_op(floatType , code); break;
3266 case Bytecodes::_dadd : arithmetic_op(doubleType, code); break;
3267 case Bytecodes::_isub : arithmetic_op(intType , code); break;
3268 case Bytecodes::_lsub : arithmetic_op(longType , code); break;
3269 case Bytecodes::_fsub : arithmetic_op(floatType , code); break;
3270 case Bytecodes::_dsub : arithmetic_op(doubleType, code); break;
3271 case Bytecodes::_imul : arithmetic_op(intType , code); break;
3272 case Bytecodes::_lmul : arithmetic_op(longType , code); break;
3273 case Bytecodes::_fmul : arithmetic_op(floatType , code); break;
3274 case Bytecodes::_dmul : arithmetic_op(doubleType, code); break;
3275 case Bytecodes::_idiv : arithmetic_op(intType , code, copy_state_for_exception()); break;
3276 case Bytecodes::_ldiv : arithmetic_op(longType , code, copy_state_for_exception()); break;
3277 case Bytecodes::_fdiv : arithmetic_op(floatType , code); break;
3278 case Bytecodes::_ddiv : arithmetic_op(doubleType, code); break;
3279 case Bytecodes::_irem : arithmetic_op(intType , code, copy_state_for_exception()); break;
3280 case Bytecodes::_lrem : arithmetic_op(longType , code, copy_state_for_exception()); break;
3281 case Bytecodes::_frem : arithmetic_op(floatType , code); break;
3282 case Bytecodes::_drem : arithmetic_op(doubleType, code); break;
3283 case Bytecodes::_ineg : negate_op(intType ); break;
3284 case Bytecodes::_lneg : negate_op(longType ); break;
3285 case Bytecodes::_fneg : negate_op(floatType ); break;
3286 case Bytecodes::_dneg : negate_op(doubleType); break;
3287 case Bytecodes::_ishl : shift_op(intType , code); break;
3288 case Bytecodes::_lshl : shift_op(longType, code); break;
3289 case Bytecodes::_ishr : shift_op(intType , code); break;
3290 case Bytecodes::_lshr : shift_op(longType, code); break;
3291 case Bytecodes::_iushr : shift_op(intType , code); break;
3292 case Bytecodes::_lushr : shift_op(longType, code); break;
3293 case Bytecodes::_iand : logic_op(intType , code); break;
3294 case Bytecodes::_land : logic_op(longType, code); break;
3295 case Bytecodes::_ior : logic_op(intType , code); break;
3296 case Bytecodes::_lor : logic_op(longType, code); break;
3297 case Bytecodes::_ixor : logic_op(intType , code); break;
3298 case Bytecodes::_lxor : logic_op(longType, code); break;
3299 case Bytecodes::_iinc : increment(); break;
3300 case Bytecodes::_i2l : convert(code, T_INT , T_LONG ); break;
3301 case Bytecodes::_i2f : convert(code, T_INT , T_FLOAT ); break;
3302 case Bytecodes::_i2d : convert(code, T_INT , T_DOUBLE); break;
3303 case Bytecodes::_l2i : convert(code, T_LONG , T_INT ); break;
3304 case Bytecodes::_l2f : convert(code, T_LONG , T_FLOAT ); break;
3305 case Bytecodes::_l2d : convert(code, T_LONG , T_DOUBLE); break;
3306 case Bytecodes::_f2i : convert(code, T_FLOAT , T_INT ); break;
3307 case Bytecodes::_f2l : convert(code, T_FLOAT , T_LONG ); break;
3308 case Bytecodes::_f2d : convert(code, T_FLOAT , T_DOUBLE); break;
3309 case Bytecodes::_d2i : convert(code, T_DOUBLE, T_INT ); break;
3310 case Bytecodes::_d2l : convert(code, T_DOUBLE, T_LONG ); break;
3311 case Bytecodes::_d2f : convert(code, T_DOUBLE, T_FLOAT ); break;
3312 case Bytecodes::_i2b : convert(code, T_INT , T_BYTE ); break;
3313 case Bytecodes::_i2c : convert(code, T_INT , T_CHAR ); break;
3314 case Bytecodes::_i2s : convert(code, T_INT , T_SHORT ); break;
3315 case Bytecodes::_lcmp : compare_op(longType , code); break;
3316 case Bytecodes::_fcmpl : compare_op(floatType , code); break;
3317 case Bytecodes::_fcmpg : compare_op(floatType , code); break;
3318 case Bytecodes::_dcmpl : compare_op(doubleType, code); break;
3319 case Bytecodes::_dcmpg : compare_op(doubleType, code); break;
3320 case Bytecodes::_ifeq : if_zero(intType , If::eql); break;
3321 case Bytecodes::_ifne : if_zero(intType , If::neq); break;
3322 case Bytecodes::_iflt : if_zero(intType , If::lss); break;
3323 case Bytecodes::_ifge : if_zero(intType , If::geq); break;
3324 case Bytecodes::_ifgt : if_zero(intType , If::gtr); break;
3325 case Bytecodes::_ifle : if_zero(intType , If::leq); break;
3326 case Bytecodes::_if_icmpeq : if_same(intType , If::eql); break;
3327 case Bytecodes::_if_icmpne : if_same(intType , If::neq); break;
3328 case Bytecodes::_if_icmplt : if_same(intType , If::lss); break;
3329 case Bytecodes::_if_icmpge : if_same(intType , If::geq); break;
3330 case Bytecodes::_if_icmpgt : if_same(intType , If::gtr); break;
3331 case Bytecodes::_if_icmple : if_same(intType , If::leq); break;
3332 case Bytecodes::_if_acmpeq : if_same(objectType, If::eql); break;
3333 case Bytecodes::_if_acmpne : if_same(objectType, If::neq); break;
3334 case Bytecodes::_goto : _goto(s.cur_bci(), s.get_dest()); break;
3335 case Bytecodes::_jsr : jsr(s.get_dest()); break;
3336 case Bytecodes::_ret : ret(s.get_index()); break;
3337 case Bytecodes::_tableswitch : table_switch(); break;
3338 case Bytecodes::_lookupswitch : lookup_switch(); break;
3339 case Bytecodes::_ireturn : method_return(ipop(), ignore_return); break;
3340 case Bytecodes::_lreturn : method_return(lpop(), ignore_return); break;
3341 case Bytecodes::_freturn : method_return(fpop(), ignore_return); break;
3342 case Bytecodes::_dreturn : method_return(dpop(), ignore_return); break;
3343 case Bytecodes::_areturn : method_return(apop(), ignore_return); break;
3344 case Bytecodes::_return : method_return(nullptr, ignore_return); break;
3345 case Bytecodes::_getstatic : // fall through
3346 case Bytecodes::_putstatic : // fall through
3347 case Bytecodes::_getfield : // fall through
3348 case Bytecodes::_putfield : access_field(code); break;
3349 case Bytecodes::_invokevirtual : // fall through
3350 case Bytecodes::_invokespecial : // fall through
3351 case Bytecodes::_invokestatic : // fall through
3352 case Bytecodes::_invokedynamic : // fall through
3353 case Bytecodes::_invokeinterface: invoke(code); break;
3354 case Bytecodes::_new : new_instance(s.get_index_u2()); break;
3355 case Bytecodes::_newarray : new_type_array(); break;
3356 case Bytecodes::_anewarray : new_object_array(); break;
3357 case Bytecodes::_arraylength : { ValueStack* state_before = copy_state_for_exception(); ipush(append(new ArrayLength(apop(), state_before))); break; }
3358 case Bytecodes::_athrow : throw_op(s.cur_bci()); break;
3359 case Bytecodes::_checkcast : check_cast(s.get_index_u2()); break;
3360 case Bytecodes::_instanceof : instance_of(s.get_index_u2()); break;
3361 case Bytecodes::_monitorenter : monitorenter(apop(), s.cur_bci()); break;
3362 case Bytecodes::_monitorexit : monitorexit (apop(), s.cur_bci()); break;
3363 case Bytecodes::_wide : ShouldNotReachHere(); break;
3364 case Bytecodes::_multianewarray : new_multi_array(s.cur_bcp()[3]); break;
3365 case Bytecodes::_ifnull : if_null(objectType, If::eql); break;
3366 case Bytecodes::_ifnonnull : if_null(objectType, If::neq); break;
3367 case Bytecodes::_goto_w : _goto(s.cur_bci(), s.get_far_dest()); break;
3368 case Bytecodes::_jsr_w : jsr(s.get_far_dest()); break;
3369 case Bytecodes::_aconst_init : default_value(s.get_index_u2()); break;
3370 case Bytecodes::_withfield : withfield(s.get_index_u2()); break;
3371 case Bytecodes::_breakpoint : BAILOUT_("concurrent setting of breakpoint", nullptr);
3372 default : ShouldNotReachHere(); break;
3373 }
3374
3375 if (log != nullptr)
3376 log->clear_context(); // skip marker if nothing was printed
3377
3378 // save current bci to setup Goto at the end
3379 prev_bci = s.cur_bci();
3380
3381 }
3382 CHECK_BAILOUT_(nullptr);
3383 // stop processing of this block (see try_inline_full)
3384 if (_skip_block) {
3385 _skip_block = false;
3386 assert(_last && _last->as_BlockEnd(), "");
3387 return _last->as_BlockEnd();
3388 }
3389 // if there are any, check if last instruction is a BlockEnd instruction
3390 BlockEnd* end = last()->as_BlockEnd();
3391 if (end == nullptr) {
3392 // all blocks must end with a BlockEnd instruction => add a Goto
3393 end = new Goto(block_at(s.cur_bci()), false);
3394 append(end);
3395 }
3396 assert(end == last()->as_BlockEnd(), "inconsistency");
3397
3398 assert(end->state() != nullptr, "state must already be present");
3399 assert(end->as_Return() == nullptr || end->as_Throw() == nullptr || end->state()->stack_size() == 0, "stack not needed for return and throw");
3400
3401 // connect to begin & set state
3402 // NOTE that inlining may have changed the block we are parsing
3403 block()->set_end(end);
3404 // propagate state
3405 for (int i = end->number_of_sux() - 1; i >= 0; i--) {
3406 BlockBegin* sux = end->sux_at(i);
3407 assert(sux->is_predecessor(block()), "predecessor missing");
3408 // be careful, bailout if bytecodes are strange
3409 if (!sux->try_merge(end->state(), compilation()->has_irreducible_loops())) BAILOUT_("block join failed", nullptr);
3410 scope_data()->add_to_work_list(end->sux_at(i));
3411 }
3412
3413 scope_data()->set_stream(nullptr);
3414
3415 // done
3416 return end;
3417 }
3418
3419
3420 void GraphBuilder::iterate_all_blocks(bool start_in_current_block_for_inlining) {
3421 do {
3422 if (start_in_current_block_for_inlining && !bailed_out()) {
3423 iterate_bytecodes_for_block(0);
3424 start_in_current_block_for_inlining = false;
3425 } else {
3426 BlockBegin* b;
3427 while ((b = scope_data()->remove_from_work_list()) != nullptr) {
3428 if (!b->is_set(BlockBegin::was_visited_flag)) {
3429 if (b->is_set(BlockBegin::osr_entry_flag)) {
3430 // we're about to parse the osr entry block, so make sure
3431 // we setup the OSR edge leading into this block so that
3432 // Phis get setup correctly.
3433 setup_osr_entry_block();
3434 // this is no longer the osr entry block, so clear it.
3435 b->clear(BlockBegin::osr_entry_flag);
3436 }
3437 b->set(BlockBegin::was_visited_flag);
3438 connect_to_end(b);
3439 }
3440 }
3441 }
3442 } while (!bailed_out() && !scope_data()->is_work_list_empty());
3443 }
3444
3445
3446 bool GraphBuilder::_can_trap [Bytecodes::number_of_java_codes];
3447
3448 void GraphBuilder::initialize() {
3449 // the following bytecodes are assumed to potentially
3450 // throw exceptions in compiled code - note that e.g.
3451 // monitorexit & the return bytecodes do not throw
3452 // exceptions since monitor pairing proved that they
3453 // succeed (if monitor pairing succeeded)
3454 Bytecodes::Code can_trap_list[] =
3455 { Bytecodes::_ldc
3456 , Bytecodes::_ldc_w
3457 , Bytecodes::_ldc2_w
3458 , Bytecodes::_iaload
3459 , Bytecodes::_laload
3460 , Bytecodes::_faload
3461 , Bytecodes::_daload
3462 , Bytecodes::_aaload
3463 , Bytecodes::_baload
3464 , Bytecodes::_caload
3465 , Bytecodes::_saload
3466 , Bytecodes::_iastore
3467 , Bytecodes::_lastore
3468 , Bytecodes::_fastore
3469 , Bytecodes::_dastore
3470 , Bytecodes::_aastore
3471 , Bytecodes::_bastore
3472 , Bytecodes::_castore
3473 , Bytecodes::_sastore
3474 , Bytecodes::_idiv
3475 , Bytecodes::_ldiv
3476 , Bytecodes::_irem
3477 , Bytecodes::_lrem
3478 , Bytecodes::_getstatic
3479 , Bytecodes::_putstatic
3480 , Bytecodes::_getfield
3481 , Bytecodes::_putfield
3482 , Bytecodes::_invokevirtual
3483 , Bytecodes::_invokespecial
3484 , Bytecodes::_invokestatic
3485 , Bytecodes::_invokedynamic
3486 , Bytecodes::_invokeinterface
3487 , Bytecodes::_new
3488 , Bytecodes::_newarray
3489 , Bytecodes::_anewarray
3490 , Bytecodes::_arraylength
3491 , Bytecodes::_athrow
3492 , Bytecodes::_checkcast
3493 , Bytecodes::_instanceof
3494 , Bytecodes::_monitorenter
3495 , Bytecodes::_multianewarray
3496 };
3497
3498 // inititialize trap tables
3499 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) {
3500 _can_trap[i] = false;
3501 }
3502 // set standard trap info
3503 for (uint j = 0; j < ARRAY_SIZE(can_trap_list); j++) {
3504 _can_trap[can_trap_list[j]] = true;
3505 }
3506 }
3507
3508
3509 BlockBegin* GraphBuilder::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) {
3510 assert(entry->is_set(f), "entry/flag mismatch");
3511 // create header block
3512 BlockBegin* h = new BlockBegin(entry->bci());
3513 h->set_depth_first_number(0);
3514
3515 Value l = h;
3516 BlockEnd* g = new Goto(entry, false);
3517 l->set_next(g, entry->bci());
3518 h->set_end(g);
3519 h->set(f);
3520 // setup header block end state
3521 ValueStack* s = state->copy(ValueStack::StateAfter, entry->bci()); // can use copy since stack is empty (=> no phis)
3522 assert(s->stack_is_empty(), "must have empty stack at entry point");
3523 g->set_state(s);
3524 return h;
3525 }
3526
3527
3528
3529 BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* state) {
3530 BlockBegin* start = new BlockBegin(0);
3531
3532 // This code eliminates the empty start block at the beginning of
3533 // each method. Previously, each method started with the
3534 // start-block created below, and this block was followed by the
3535 // header block that was always empty. This header block is only
3536 // necessary if std_entry is also a backward branch target because
3537 // then phi functions may be necessary in the header block. It's
3538 // also necessary when profiling so that there's a single block that
3539 // can increment the counters.
3540 // In addition, with range check elimination, we may need a valid block
3541 // that dominates all the rest to insert range predicates.
3542 BlockBegin* new_header_block;
3543 if (std_entry->number_of_preds() > 0 || is_profiling() || RangeCheckElimination) {
3544 new_header_block = header_block(std_entry, BlockBegin::std_entry_flag, state);
3545 } else {
3546 new_header_block = std_entry;
3547 }
3548
3549 // setup start block (root for the IR graph)
3550 Base* base =
3551 new Base(
3552 new_header_block,
3553 osr_entry
3554 );
3555 start->set_next(base, 0);
3556 start->set_end(base);
3557 // create & setup state for start block
3558 start->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
3559 base->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
3560
3561 if (base->std_entry()->state() == nullptr) {
3562 // setup states for header blocks
3563 base->std_entry()->merge(state, compilation()->has_irreducible_loops());
3564 }
3565
3566 assert(base->std_entry()->state() != nullptr, "");
3567 return start;
3568 }
3569
3570
3571 void GraphBuilder::setup_osr_entry_block() {
3572 assert(compilation()->is_osr_compile(), "only for osrs");
3573
3574 int osr_bci = compilation()->osr_bci();
3575 ciBytecodeStream s(method());
3576 s.reset_to_bci(osr_bci);
3577 s.next();
3578 scope_data()->set_stream(&s);
3579
3580 // create a new block to be the osr setup code
3581 _osr_entry = new BlockBegin(osr_bci);
3582 _osr_entry->set(BlockBegin::osr_entry_flag);
3583 _osr_entry->set_depth_first_number(0);
3584 BlockBegin* target = bci2block()->at(osr_bci);
3585 assert(target != nullptr && target->is_set(BlockBegin::osr_entry_flag), "must be there");
3586 // the osr entry has no values for locals
3587 ValueStack* state = target->state()->copy();
3588 _osr_entry->set_state(state);
3589
3590 kill_all();
3591 _block = _osr_entry;
3592 _state = _osr_entry->state()->copy();
3593 assert(_state->bci() == osr_bci, "mismatch");
3594 _last = _osr_entry;
3595 Value e = append(new OsrEntry());
3596 e->set_needs_null_check(false);
3597
3598 // OSR buffer is
3599 //
3600 // locals[nlocals-1..0]
3601 // monitors[number_of_locks-1..0]
3602 //
3603 // locals is a direct copy of the interpreter frame so in the osr buffer
3604 // so first slot in the local array is the last local from the interpreter
3605 // and last slot is local[0] (receiver) from the interpreter
3606 //
3607 // Similarly with locks. The first lock slot in the osr buffer is the nth lock
3608 // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock
3609 // in the interpreter frame (the method lock if a sync method)
3610
3611 // Initialize monitors in the compiled activation.
3612
3613 int index;
3614 Value local;
3615
3616 // find all the locals that the interpreter thinks contain live oops
3617 const ResourceBitMap live_oops = method()->live_local_oops_at_bci(osr_bci);
3618
3619 // compute the offset into the locals so that we can treat the buffer
3620 // as if the locals were still in the interpreter frame
3621 int locals_offset = BytesPerWord * (method()->max_locals() - 1);
3622 for_each_local_value(state, index, local) {
3623 int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord;
3624 Value get;
3625 if (local->type()->is_object_kind() && !live_oops.at(index)) {
3626 // The interpreter thinks this local is dead but the compiler
3627 // doesn't so pretend that the interpreter passed in null.
3628 get = append(new Constant(objectNull));
3629 } else {
3630 Value off_val = append(new Constant(new IntConstant(offset)));
3631 get = append(new UnsafeGet(as_BasicType(local->type()), e,
3632 off_val,
3633 false/*is_volatile*/,
3634 true/*is_raw*/));
3635 }
3636 _state->store_local(index, get);
3637 }
3638
3639 // the storage for the OSR buffer is freed manually in the LIRGenerator.
3640
3641 assert(state->caller_state() == nullptr, "should be top scope");
3642 state->clear_locals();
3643 Goto* g = new Goto(target, false);
3644 append(g);
3645 _osr_entry->set_end(g);
3646 target->merge(_osr_entry->end()->state(), compilation()->has_irreducible_loops());
3647
3648 scope_data()->set_stream(nullptr);
3649 }
3650
3651
3652 ValueStack* GraphBuilder::state_at_entry() {
3653 ValueStack* state = new ValueStack(scope(), nullptr);
3654
3655 // Set up locals for receiver
3656 int idx = 0;
3657 if (!method()->is_static()) {
3658 // we should always see the receiver
3659 state->store_local(idx, new Local(method()->holder(), objectType, idx,
3660 /*receiver*/ true, /*null_free*/ method()->holder()->is_flat_array_klass()));
3661 idx = 1;
3662 }
3663
3664 // Set up locals for incoming arguments
3665 ciSignature* sig = method()->signature();
3666 for (int i = 0; i < sig->count(); i++) {
3667 ciType* type = sig->type_at(i);
3668 BasicType basic_type = type->basic_type();
3669 // don't allow T_ARRAY to propagate into locals types
3670 if (is_reference_type(basic_type)) basic_type = T_OBJECT;
3671 ValueType* vt = as_ValueType(basic_type);
3672 state->store_local(idx, new Local(type, vt, idx, false, sig->is_null_free_at(i)));
3673 idx += type->size();
3674 }
3675
3676 // lock synchronized method
3677 if (method()->is_synchronized()) {
3678 state->lock(nullptr);
3679 }
3680
3681 return state;
3682 }
3683
3684
3685 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope)
3686 : _scope_data(nullptr)
3687 , _compilation(compilation)
3688 , _memory(new MemoryBuffer())
3689 , _inline_bailout_msg(nullptr)
3690 , _instruction_count(0)
3691 , _osr_entry(nullptr)
3692 , _pending_field_access(nullptr)
3693 , _pending_load_indexed(nullptr)
3694 {
3695 int osr_bci = compilation->osr_bci();
3696
3697 // determine entry points and bci2block mapping
3698 BlockListBuilder blm(compilation, scope, osr_bci);
3699 CHECK_BAILOUT();
3700
3701 BlockList* bci2block = blm.bci2block();
3702 BlockBegin* start_block = bci2block->at(0);
3703
3704 push_root_scope(scope, bci2block, start_block);
3705
3706 // setup state for std entry
3707 _initial_state = state_at_entry();
3708 start_block->merge(_initial_state, compilation->has_irreducible_loops());
3709
3710 // End nulls still exist here
3711
3712 // complete graph
3713 _vmap = new ValueMap();
3714 switch (scope->method()->intrinsic_id()) {
3715 case vmIntrinsics::_dabs : // fall through
3716 case vmIntrinsics::_dsqrt : // fall through
3717 case vmIntrinsics::_dsqrt_strict : // fall through
3718 case vmIntrinsics::_dsin : // fall through
3719 case vmIntrinsics::_dcos : // fall through
3720 case vmIntrinsics::_dtan : // fall through
3721 case vmIntrinsics::_dlog : // fall through
3722 case vmIntrinsics::_dlog10 : // fall through
3723 case vmIntrinsics::_dexp : // fall through
3724 case vmIntrinsics::_dpow : // fall through
3725 {
3726 // Compiles where the root method is an intrinsic need a special
3727 // compilation environment because the bytecodes for the method
3728 // shouldn't be parsed during the compilation, only the special
3729 // Intrinsic node should be emitted. If this isn't done the
3730 // code for the inlined version will be different than the root
3731 // compiled version which could lead to monotonicity problems on
3732 // intel.
3733 if (CheckIntrinsics && !scope->method()->intrinsic_candidate()) {
3734 BAILOUT("failed to inline intrinsic, method not annotated");
3735 }
3736
3737 // Set up a stream so that appending instructions works properly.
3738 ciBytecodeStream s(scope->method());
3739 s.reset_to_bci(0);
3740 scope_data()->set_stream(&s);
3741 s.next();
3742
3743 // setup the initial block state
3744 _block = start_block;
3745 _state = start_block->state()->copy_for_parsing();
3746 _last = start_block;
3747 load_local(doubleType, 0);
3748 if (scope->method()->intrinsic_id() == vmIntrinsics::_dpow) {
3749 load_local(doubleType, 2);
3750 }
3751
3752 // Emit the intrinsic node.
3753 bool result = try_inline_intrinsics(scope->method());
3754 if (!result) BAILOUT("failed to inline intrinsic");
3755 method_return(dpop());
3756
3757 // connect the begin and end blocks and we're all done.
3758 BlockEnd* end = last()->as_BlockEnd();
3759 block()->set_end(end);
3760 break;
3761 }
3762
3763 case vmIntrinsics::_Reference_get:
3764 {
3765 {
3766 // With java.lang.ref.reference.get() we must go through the
3767 // intrinsic - when G1 is enabled - even when get() is the root
3768 // method of the compile so that, if necessary, the value in
3769 // the referent field of the reference object gets recorded by
3770 // the pre-barrier code.
3771 // Specifically, if G1 is enabled, the value in the referent
3772 // field is recorded by the G1 SATB pre barrier. This will
3773 // result in the referent being marked live and the reference
3774 // object removed from the list of discovered references during
3775 // reference processing.
3776 if (CheckIntrinsics && !scope->method()->intrinsic_candidate()) {
3777 BAILOUT("failed to inline intrinsic, method not annotated");
3778 }
3779
3780 // Also we need intrinsic to prevent commoning reads from this field
3781 // across safepoint since GC can change its value.
3782
3783 // Set up a stream so that appending instructions works properly.
3784 ciBytecodeStream s(scope->method());
3785 s.reset_to_bci(0);
3786 scope_data()->set_stream(&s);
3787 s.next();
3788
3789 // setup the initial block state
3790 _block = start_block;
3791 _state = start_block->state()->copy_for_parsing();
3792 _last = start_block;
3793 load_local(objectType, 0);
3794
3795 // Emit the intrinsic node.
3796 bool result = try_inline_intrinsics(scope->method());
3797 if (!result) BAILOUT("failed to inline intrinsic");
3798 method_return(apop());
3799
3800 // connect the begin and end blocks and we're all done.
3801 BlockEnd* end = last()->as_BlockEnd();
3802 block()->set_end(end);
3803 break;
3804 }
3805 // Otherwise, fall thru
3806 }
3807
3808 default:
3809 scope_data()->add_to_work_list(start_block);
3810 iterate_all_blocks();
3811 break;
3812 }
3813 CHECK_BAILOUT();
3814
3815 # ifdef ASSERT
3816 // For all blocks reachable from start_block: _end must be non-null
3817 {
3818 BlockList processed;
3819 BlockList to_go;
3820 to_go.append(start_block);
3821 while(to_go.length() > 0) {
3822 BlockBegin* current = to_go.pop();
3823 assert(current != nullptr, "Should not happen.");
3824 assert(current->end() != nullptr, "All blocks reachable from start_block should have end() != nullptr.");
3825 processed.append(current);
3826 for(int i = 0; i < current->number_of_sux(); i++) {
3827 BlockBegin* s = current->sux_at(i);
3828 if (!processed.contains(s)) {
3829 to_go.append(s);
3830 }
3831 }
3832 }
3833 }
3834 #endif // ASSERT
3835
3836 _start = setup_start_block(osr_bci, start_block, _osr_entry, _initial_state);
3837
3838 eliminate_redundant_phis(_start);
3839
3840 NOT_PRODUCT(if (PrintValueNumbering && Verbose) print_stats());
3841 // for osr compile, bailout if some requirements are not fulfilled
3842 if (osr_bci != -1) {
3843 BlockBegin* osr_block = blm.bci2block()->at(osr_bci);
3844 if (!osr_block->is_set(BlockBegin::was_visited_flag)) {
3845 BAILOUT("osr entry must have been visited for osr compile");
3846 }
3847
3848 // check if osr entry point has empty stack - we cannot handle non-empty stacks at osr entry points
3849 if (!osr_block->state()->stack_is_empty()) {
3850 BAILOUT("stack not empty at OSR entry point");
3851 }
3852 }
3853 #ifndef PRODUCT
3854 if (PrintCompilation && Verbose) tty->print_cr("Created %d Instructions", _instruction_count);
3855 #endif
3856 }
3857
3858
3859 ValueStack* GraphBuilder::copy_state_before() {
3860 return copy_state_before_with_bci(bci());
3861 }
3862
3863 ValueStack* GraphBuilder::copy_state_exhandling() {
3864 return copy_state_exhandling_with_bci(bci());
3865 }
3866
3867 ValueStack* GraphBuilder::copy_state_for_exception() {
3868 return copy_state_for_exception_with_bci(bci());
3869 }
3870
3871 ValueStack* GraphBuilder::copy_state_before_with_bci(int bci) {
3872 return state()->copy(ValueStack::StateBefore, bci);
3873 }
3874
3875 ValueStack* GraphBuilder::copy_state_exhandling_with_bci(int bci) {
3876 if (!has_handler()) return nullptr;
3877 return state()->copy(ValueStack::StateBefore, bci);
3878 }
3879
3880 ValueStack* GraphBuilder::copy_state_for_exception_with_bci(int bci) {
3881 ValueStack* s = copy_state_exhandling_with_bci(bci);
3882 if (s == nullptr) {
3883 if (_compilation->env()->should_retain_local_variables()) {
3884 s = state()->copy(ValueStack::ExceptionState, bci);
3885 } else {
3886 s = state()->copy(ValueStack::EmptyExceptionState, bci);
3887 }
3888 }
3889 return s;
3890 }
3891
3892 int GraphBuilder::recursive_inline_level(ciMethod* cur_callee) const {
3893 int recur_level = 0;
3894 for (IRScope* s = scope(); s != nullptr; s = s->caller()) {
3895 if (s->method() == cur_callee) {
3896 ++recur_level;
3897 }
3898 }
3899 return recur_level;
3900 }
3901
3902
3903 bool GraphBuilder::try_inline(ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc, Value receiver) {
3904 const char* msg = nullptr;
3905
3906 // clear out any existing inline bailout condition
3907 clear_inline_bailout();
3908
3909 // exclude methods we don't want to inline
3910 msg = should_not_inline(callee);
3911 if (msg != nullptr) {
3912 print_inlining(callee, msg, /*success*/ false);
3913 return false;
3914 }
3915
3916 // method handle invokes
3917 if (callee->is_method_handle_intrinsic()) {
3918 if (try_method_handle_inline(callee, ignore_return)) {
3919 if (callee->has_reserved_stack_access()) {
3920 compilation()->set_has_reserved_stack_access(true);
3921 }
3922 return true;
3923 }
3924 return false;
3925 }
3926
3927 // handle intrinsics
3928 if (callee->intrinsic_id() != vmIntrinsics::_none &&
3929 callee->check_intrinsic_candidate()) {
3930 if (try_inline_intrinsics(callee, ignore_return)) {
3931 print_inlining(callee, "intrinsic");
3932 if (callee->has_reserved_stack_access()) {
3933 compilation()->set_has_reserved_stack_access(true);
3934 }
3935 return true;
3936 }
3937 // try normal inlining
3938 }
3939
3940 // certain methods cannot be parsed at all
3941 msg = check_can_parse(callee);
3942 if (msg != nullptr) {
3943 print_inlining(callee, msg, /*success*/ false);
3944 return false;
3945 }
3946
3947 // If bytecode not set use the current one.
3948 if (bc == Bytecodes::_illegal) {
3949 bc = code();
3950 }
3951 if (try_inline_full(callee, holder_known, ignore_return, bc, receiver)) {
3952 if (callee->has_reserved_stack_access()) {
3953 compilation()->set_has_reserved_stack_access(true);
3954 }
3955 return true;
3956 }
3957
3958 // Entire compilation could fail during try_inline_full call.
3959 // In that case printing inlining decision info is useless.
3960 if (!bailed_out())
3961 print_inlining(callee, _inline_bailout_msg, /*success*/ false);
3962
3963 return false;
3964 }
3965
3966
3967 const char* GraphBuilder::check_can_parse(ciMethod* callee) const {
3968 // Certain methods cannot be parsed at all:
3969 if ( callee->is_native()) return "native method";
3970 if ( callee->is_abstract()) return "abstract method";
3971 if (!callee->can_be_parsed()) return "cannot be parsed";
3972 return nullptr;
3973 }
3974
3975 // negative filter: should callee NOT be inlined? returns null, ok to inline, or rejection msg
3976 const char* GraphBuilder::should_not_inline(ciMethod* callee) const {
3977 if ( compilation()->directive()->should_not_inline(callee)) return "disallowed by CompileCommand";
3978 if ( callee->dont_inline()) return "don't inline by annotation";
3979 return nullptr;
3980 }
3981
3982 void GraphBuilder::build_graph_for_intrinsic(ciMethod* callee, bool ignore_return) {
3983 vmIntrinsics::ID id = callee->intrinsic_id();
3984 assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
3985
3986 // Some intrinsics need special IR nodes.
3987 switch(id) {
3988 case vmIntrinsics::_getReference : append_unsafe_get(callee, T_OBJECT, false); return;
3989 case vmIntrinsics::_getBoolean : append_unsafe_get(callee, T_BOOLEAN, false); return;
3990 case vmIntrinsics::_getByte : append_unsafe_get(callee, T_BYTE, false); return;
3991 case vmIntrinsics::_getShort : append_unsafe_get(callee, T_SHORT, false); return;
3992 case vmIntrinsics::_getChar : append_unsafe_get(callee, T_CHAR, false); return;
3993 case vmIntrinsics::_getInt : append_unsafe_get(callee, T_INT, false); return;
3994 case vmIntrinsics::_getLong : append_unsafe_get(callee, T_LONG, false); return;
3995 case vmIntrinsics::_getFloat : append_unsafe_get(callee, T_FLOAT, false); return;
3996 case vmIntrinsics::_getDouble : append_unsafe_get(callee, T_DOUBLE, false); return;
3997 case vmIntrinsics::_putReference : append_unsafe_put(callee, T_OBJECT, false); return;
3998 case vmIntrinsics::_putBoolean : append_unsafe_put(callee, T_BOOLEAN, false); return;
3999 case vmIntrinsics::_putByte : append_unsafe_put(callee, T_BYTE, false); return;
4000 case vmIntrinsics::_putShort : append_unsafe_put(callee, T_SHORT, false); return;
4001 case vmIntrinsics::_putChar : append_unsafe_put(callee, T_CHAR, false); return;
4002 case vmIntrinsics::_putInt : append_unsafe_put(callee, T_INT, false); return;
4003 case vmIntrinsics::_putLong : append_unsafe_put(callee, T_LONG, false); return;
4004 case vmIntrinsics::_putFloat : append_unsafe_put(callee, T_FLOAT, false); return;
4005 case vmIntrinsics::_putDouble : append_unsafe_put(callee, T_DOUBLE, false); return;
4006 case vmIntrinsics::_getShortUnaligned : append_unsafe_get(callee, T_SHORT, false); return;
4007 case vmIntrinsics::_getCharUnaligned : append_unsafe_get(callee, T_CHAR, false); return;
4008 case vmIntrinsics::_getIntUnaligned : append_unsafe_get(callee, T_INT, false); return;
4009 case vmIntrinsics::_getLongUnaligned : append_unsafe_get(callee, T_LONG, false); return;
4010 case vmIntrinsics::_putShortUnaligned : append_unsafe_put(callee, T_SHORT, false); return;
4011 case vmIntrinsics::_putCharUnaligned : append_unsafe_put(callee, T_CHAR, false); return;
4012 case vmIntrinsics::_putIntUnaligned : append_unsafe_put(callee, T_INT, false); return;
4013 case vmIntrinsics::_putLongUnaligned : append_unsafe_put(callee, T_LONG, false); return;
4014 case vmIntrinsics::_getReferenceVolatile : append_unsafe_get(callee, T_OBJECT, true); return;
4015 case vmIntrinsics::_getBooleanVolatile : append_unsafe_get(callee, T_BOOLEAN, true); return;
4016 case vmIntrinsics::_getByteVolatile : append_unsafe_get(callee, T_BYTE, true); return;
4017 case vmIntrinsics::_getShortVolatile : append_unsafe_get(callee, T_SHORT, true); return;
4018 case vmIntrinsics::_getCharVolatile : append_unsafe_get(callee, T_CHAR, true); return;
4019 case vmIntrinsics::_getIntVolatile : append_unsafe_get(callee, T_INT, true); return;
4020 case vmIntrinsics::_getLongVolatile : append_unsafe_get(callee, T_LONG, true); return;
4021 case vmIntrinsics::_getFloatVolatile : append_unsafe_get(callee, T_FLOAT, true); return;
4022 case vmIntrinsics::_getDoubleVolatile : append_unsafe_get(callee, T_DOUBLE, true); return;
4023 case vmIntrinsics::_putReferenceVolatile : append_unsafe_put(callee, T_OBJECT, true); return;
4024 case vmIntrinsics::_putBooleanVolatile : append_unsafe_put(callee, T_BOOLEAN, true); return;
4025 case vmIntrinsics::_putByteVolatile : append_unsafe_put(callee, T_BYTE, true); return;
4026 case vmIntrinsics::_putShortVolatile : append_unsafe_put(callee, T_SHORT, true); return;
4027 case vmIntrinsics::_putCharVolatile : append_unsafe_put(callee, T_CHAR, true); return;
4028 case vmIntrinsics::_putIntVolatile : append_unsafe_put(callee, T_INT, true); return;
4029 case vmIntrinsics::_putLongVolatile : append_unsafe_put(callee, T_LONG, true); return;
4030 case vmIntrinsics::_putFloatVolatile : append_unsafe_put(callee, T_FLOAT, true); return;
4031 case vmIntrinsics::_putDoubleVolatile : append_unsafe_put(callee, T_DOUBLE, true); return;
4032 case vmIntrinsics::_compareAndSetLong:
4033 case vmIntrinsics::_compareAndSetInt:
4034 case vmIntrinsics::_compareAndSetReference : append_unsafe_CAS(callee); return;
4035 case vmIntrinsics::_getAndAddInt:
4036 case vmIntrinsics::_getAndAddLong : append_unsafe_get_and_set(callee, true); return;
4037 case vmIntrinsics::_getAndSetInt :
4038 case vmIntrinsics::_getAndSetLong :
4039 case vmIntrinsics::_getAndSetReference : append_unsafe_get_and_set(callee, false); return;
4040 case vmIntrinsics::_getCharStringU : append_char_access(callee, false); return;
4041 case vmIntrinsics::_putCharStringU : append_char_access(callee, true); return;
4042 default:
4043 break;
4044 }
4045
4046 // create intrinsic node
4047 const bool has_receiver = !callee->is_static();
4048 ValueType* result_type = as_ValueType(callee->return_type());
4049 ValueStack* state_before = copy_state_for_exception();
4050
4051 Values* args = state()->pop_arguments(callee->arg_size());
4052
4053 if (is_profiling()) {
4054 // Don't profile in the special case where the root method
4055 // is the intrinsic
4056 if (callee != method()) {
4057 // Note that we'd collect profile data in this method if we wanted it.
4058 compilation()->set_would_profile(true);
4059 if (profile_calls()) {
4060 Value recv = nullptr;
4061 if (has_receiver) {
4062 recv = args->at(0);
4063 null_check(recv);
4064 }
4065 profile_call(callee, recv, nullptr, collect_args_for_profiling(args, callee, true), true);
4066 }
4067 }
4068 }
4069
4070 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(),
4071 args, has_receiver, state_before,
4072 vmIntrinsics::preserves_state(id),
4073 vmIntrinsics::can_trap(id));
4074 // append instruction & push result
4075 Value value = append_split(result);
4076 if (result_type != voidType && !ignore_return) {
4077 push(result_type, value);
4078 }
4079
4080 if (callee != method() && profile_return() && result_type->is_object_kind()) {
4081 profile_return_type(result, callee);
4082 }
4083 }
4084
4085 bool GraphBuilder::try_inline_intrinsics(ciMethod* callee, bool ignore_return) {
4086 // For calling is_intrinsic_available we need to transition to
4087 // the '_thread_in_vm' state because is_intrinsic_available()
4088 // accesses critical VM-internal data.
4089 bool is_available = false;
4090 {
4091 VM_ENTRY_MARK;
4092 methodHandle mh(THREAD, callee->get_Method());
4093 is_available = _compilation->compiler()->is_intrinsic_available(mh, _compilation->directive());
4094 }
4095
4096 if (!is_available) {
4097 if (!InlineNatives) {
4098 // Return false and also set message that the inlining of
4099 // intrinsics has been disabled in general.
4100 INLINE_BAILOUT("intrinsic method inlining disabled");
4101 } else {
4102 return false;
4103 }
4104 }
4105 build_graph_for_intrinsic(callee, ignore_return);
4106 return true;
4107 }
4108
4109
4110 bool GraphBuilder::try_inline_jsr(int jsr_dest_bci) {
4111 // Introduce a new callee continuation point - all Ret instructions
4112 // will be replaced with Gotos to this point.
4113 BlockBegin* cont = block_at(next_bci());
4114 assert(cont != nullptr, "continuation must exist (BlockListBuilder starts a new block after a jsr");
4115
4116 // Note: can not assign state to continuation yet, as we have to
4117 // pick up the state from the Ret instructions.
4118
4119 // Push callee scope
4120 push_scope_for_jsr(cont, jsr_dest_bci);
4121
4122 // Temporarily set up bytecode stream so we can append instructions
4123 // (only using the bci of this stream)
4124 scope_data()->set_stream(scope_data()->parent()->stream());
4125
4126 BlockBegin* jsr_start_block = block_at(jsr_dest_bci);
4127 assert(jsr_start_block != nullptr, "jsr start block must exist");
4128 assert(!jsr_start_block->is_set(BlockBegin::was_visited_flag), "should not have visited jsr yet");
4129 Goto* goto_sub = new Goto(jsr_start_block, false);
4130 // Must copy state to avoid wrong sharing when parsing bytecodes
4131 assert(jsr_start_block->state() == nullptr, "should have fresh jsr starting block");
4132 jsr_start_block->set_state(copy_state_before_with_bci(jsr_dest_bci));
4133 append(goto_sub);
4134 _block->set_end(goto_sub);
4135 _last = _block = jsr_start_block;
4136
4137 // Clear out bytecode stream
4138 scope_data()->set_stream(nullptr);
4139
4140 scope_data()->add_to_work_list(jsr_start_block);
4141
4142 // Ready to resume parsing in subroutine
4143 iterate_all_blocks();
4144
4145 // If we bailed out during parsing, return immediately (this is bad news)
4146 CHECK_BAILOUT_(false);
4147
4148 // Detect whether the continuation can actually be reached. If not,
4149 // it has not had state set by the join() operations in
4150 // iterate_bytecodes_for_block()/ret() and we should not touch the
4151 // iteration state. The calling activation of
4152 // iterate_bytecodes_for_block will then complete normally.
4153 if (cont->state() != nullptr) {
4154 if (!cont->is_set(BlockBegin::was_visited_flag)) {
4155 // add continuation to work list instead of parsing it immediately
4156 scope_data()->parent()->add_to_work_list(cont);
4157 }
4158 }
4159
4160 assert(jsr_continuation() == cont, "continuation must not have changed");
4161 assert(!jsr_continuation()->is_set(BlockBegin::was_visited_flag) ||
4162 jsr_continuation()->is_set(BlockBegin::parser_loop_header_flag),
4163 "continuation can only be visited in case of backward branches");
4164 assert(_last && _last->as_BlockEnd(), "block must have end");
4165
4166 // continuation is in work list, so end iteration of current block
4167 _skip_block = true;
4168 pop_scope_for_jsr();
4169
4170 return true;
4171 }
4172
4173
4174 // Inline the entry of a synchronized method as a monitor enter and
4175 // register the exception handler which releases the monitor if an
4176 // exception is thrown within the callee. Note that the monitor enter
4177 // cannot throw an exception itself, because the receiver is
4178 // guaranteed to be non-null by the explicit null check at the
4179 // beginning of inlining.
4180 void GraphBuilder::inline_sync_entry(Value lock, BlockBegin* sync_handler) {
4181 assert(lock != nullptr && sync_handler != nullptr, "lock or handler missing");
4182
4183 monitorenter(lock, SynchronizationEntryBCI);
4184 assert(_last->as_MonitorEnter() != nullptr, "monitor enter expected");
4185 _last->set_needs_null_check(false);
4186
4187 sync_handler->set(BlockBegin::exception_entry_flag);
4188 sync_handler->set(BlockBegin::is_on_work_list_flag);
4189
4190 ciExceptionHandler* desc = new ciExceptionHandler(method()->holder(), 0, method()->code_size(), -1, 0);
4191 XHandler* h = new XHandler(desc);
4192 h->set_entry_block(sync_handler);
4193 scope_data()->xhandlers()->append(h);
4194 scope_data()->set_has_handler();
4195 }
4196
4197
4198 // If an exception is thrown and not handled within an inlined
4199 // synchronized method, the monitor must be released before the
4200 // exception is rethrown in the outer scope. Generate the appropriate
4201 // instructions here.
4202 void GraphBuilder::fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler) {
4203 BlockBegin* orig_block = _block;
4204 ValueStack* orig_state = _state;
4205 Instruction* orig_last = _last;
4206 _last = _block = sync_handler;
4207 _state = sync_handler->state()->copy();
4208
4209 assert(sync_handler != nullptr, "handler missing");
4210 assert(!sync_handler->is_set(BlockBegin::was_visited_flag), "is visited here");
4211
4212 assert(lock != nullptr || default_handler, "lock or handler missing");
4213
4214 XHandler* h = scope_data()->xhandlers()->remove_last();
4215 assert(h->entry_block() == sync_handler, "corrupt list of handlers");
4216
4217 block()->set(BlockBegin::was_visited_flag);
4218 Value exception = append_with_bci(new ExceptionObject(), SynchronizationEntryBCI);
4219 assert(exception->is_pinned(), "must be");
4220
4221 int bci = SynchronizationEntryBCI;
4222 if (compilation()->env()->dtrace_method_probes()) {
4223 // Report exit from inline methods. We don't have a stream here
4224 // so pass an explicit bci of SynchronizationEntryBCI.
4225 Values* args = new Values(1);
4226 args->push(append_with_bci(new Constant(new MethodConstant(method())), bci));
4227 append_with_bci(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args), bci);
4228 }
4229
4230 if (lock) {
4231 assert(state()->locks_size() > 0 && state()->lock_at(state()->locks_size() - 1) == lock, "lock is missing");
4232 if (!lock->is_linked()) {
4233 lock = append_with_bci(lock, bci);
4234 }
4235
4236 // exit the monitor in the context of the synchronized method
4237 monitorexit(lock, bci);
4238
4239 // exit the context of the synchronized method
4240 if (!default_handler) {
4241 pop_scope();
4242 bci = _state->caller_state()->bci();
4243 _state = _state->caller_state()->copy_for_parsing();
4244 }
4245 }
4246
4247 // perform the throw as if at the call site
4248 apush(exception);
4249 throw_op(bci);
4250
4251 BlockEnd* end = last()->as_BlockEnd();
4252 block()->set_end(end);
4253
4254 _block = orig_block;
4255 _state = orig_state;
4256 _last = orig_last;
4257 }
4258
4259
4260 bool GraphBuilder::try_inline_full(ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc, Value receiver) {
4261 assert(!callee->is_native(), "callee must not be native");
4262 if (CompilationPolicy::should_not_inline(compilation()->env(), callee)) {
4263 INLINE_BAILOUT("inlining prohibited by policy");
4264 }
4265 // first perform tests of things it's not possible to inline
4266 if (callee->has_exception_handlers() &&
4267 !InlineMethodsWithExceptionHandlers) INLINE_BAILOUT("callee has exception handlers");
4268 if (callee->is_synchronized() &&
4269 !InlineSynchronizedMethods ) INLINE_BAILOUT("callee is synchronized");
4270 if (!callee->holder()->is_linked()) INLINE_BAILOUT("callee's klass not linked yet");
4271 if (bc == Bytecodes::_invokestatic &&
4272 !callee->holder()->is_initialized()) INLINE_BAILOUT("callee's klass not initialized yet");
4273 if (!callee->has_balanced_monitors()) INLINE_BAILOUT("callee's monitors do not match");
4274
4275 // Proper inlining of methods with jsrs requires a little more work.
4276 if (callee->has_jsrs() ) INLINE_BAILOUT("jsrs not handled properly by inliner yet");
4277
4278 if (is_profiling() && !callee->ensure_method_data()) {
4279 INLINE_BAILOUT("mdo allocation failed");
4280 }
4281
4282 const bool is_invokedynamic = (bc == Bytecodes::_invokedynamic);
4283 const bool has_receiver = (bc != Bytecodes::_invokestatic && !is_invokedynamic);
4284
4285 const int args_base = state()->stack_size() - callee->arg_size();
4286 assert(args_base >= 0, "stack underflow during inlining");
4287
4288 Value recv = nullptr;
4289 if (has_receiver) {
4290 assert(!callee->is_static(), "callee must not be static");
4291 assert(callee->arg_size() > 0, "must have at least a receiver");
4292
4293 recv = state()->stack_at(args_base);
4294 if (recv->is_null_obj()) {
4295 INLINE_BAILOUT("receiver is always null");
4296 }
4297 }
4298
4299 // now perform tests that are based on flag settings
4300 bool inlinee_by_directive = compilation()->directive()->should_inline(callee);
4301 if (callee->force_inline() || inlinee_by_directive) {
4302 if (inline_level() > MaxForceInlineLevel ) INLINE_BAILOUT("MaxForceInlineLevel");
4303 if (recursive_inline_level(callee) > C1MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep");
4304
4305 const char* msg = "";
4306 if (callee->force_inline()) msg = "force inline by annotation";
4307 if (inlinee_by_directive) msg = "force inline by CompileCommand";
4308 print_inlining(callee, msg);
4309 } else {
4310 // use heuristic controls on inlining
4311 if (inline_level() > C1MaxInlineLevel ) INLINE_BAILOUT("inlining too deep");
4312 int callee_recursive_level = recursive_inline_level(callee);
4313 if (callee_recursive_level > C1MaxRecursiveInlineLevel ) INLINE_BAILOUT("recursive inlining too deep");
4314 if (callee->code_size_for_inlining() > max_inline_size() ) INLINE_BAILOUT("callee is too large");
4315 // Additional condition to limit stack usage for non-recursive calls.
4316 if ((callee_recursive_level == 0) &&
4317 (callee->max_stack() + callee->max_locals() - callee->size_of_parameters() > C1InlineStackLimit)) {
4318 INLINE_BAILOUT("callee uses too much stack");
4319 }
4320
4321 // don't inline throwable methods unless the inlining tree is rooted in a throwable class
4322 if (callee->name() == ciSymbols::object_initializer_name() &&
4323 callee->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
4324 // Throwable constructor call
4325 IRScope* top = scope();
4326 while (top->caller() != nullptr) {
4327 top = top->caller();
4328 }
4329 if (!top->method()->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
4330 INLINE_BAILOUT("don't inline Throwable constructors");
4331 }
4332 }
4333
4334 if (compilation()->env()->num_inlined_bytecodes() > DesiredMethodLimit) {
4335 INLINE_BAILOUT("total inlining greater than DesiredMethodLimit");
4336 }
4337 // printing
4338 print_inlining(callee, "inline", /*success*/ true);
4339 }
4340
4341 assert(bc != Bytecodes::_invokestatic || callee->holder()->is_initialized(), "required");
4342
4343 // NOTE: Bailouts from this point on, which occur at the
4344 // GraphBuilder level, do not cause bailout just of the inlining but
4345 // in fact of the entire compilation.
4346
4347 BlockBegin* orig_block = block();
4348
4349 // Insert null check if necessary
4350 if (has_receiver) {
4351 // note: null check must happen even if first instruction of callee does
4352 // an implicit null check since the callee is in a different scope
4353 // and we must make sure exception handling does the right thing
4354 null_check(recv);
4355 }
4356
4357 if (is_profiling()) {
4358 // Note that we'd collect profile data in this method if we wanted it.
4359 // this may be redundant here...
4360 compilation()->set_would_profile(true);
4361
4362 if (profile_calls()) {
4363 int start = 0;
4364 Values* obj_args = args_list_for_profiling(callee, start, has_receiver);
4365 if (obj_args != nullptr) {
4366 int s = obj_args->capacity();
4367 // if called through method handle invoke, some arguments may have been popped
4368 for (int i = args_base+start, j = 0; j < obj_args->capacity() && i < state()->stack_size(); ) {
4369 Value v = state()->stack_at_inc(i);
4370 if (v->type()->is_object_kind()) {
4371 obj_args->push(v);
4372 j++;
4373 }
4374 }
4375 check_args_for_profiling(obj_args, s);
4376 }
4377 profile_call(callee, recv, holder_known ? callee->holder() : nullptr, obj_args, true);
4378 }
4379 }
4380
4381 // Introduce a new callee continuation point - if the callee has
4382 // more than one return instruction or the return does not allow
4383 // fall-through of control flow, all return instructions of the
4384 // callee will need to be replaced by Goto's pointing to this
4385 // continuation point.
4386 BlockBegin* cont = block_at(next_bci());
4387 bool continuation_existed = true;
4388 if (cont == nullptr) {
4389 cont = new BlockBegin(next_bci());
4390 // low number so that continuation gets parsed as early as possible
4391 cont->set_depth_first_number(0);
4392 if (PrintInitialBlockList) {
4393 tty->print_cr("CFG: created block %d (bci %d) as continuation for inline at bci %d",
4394 cont->block_id(), cont->bci(), bci());
4395 }
4396 continuation_existed = false;
4397 }
4398 // Record number of predecessors of continuation block before
4399 // inlining, to detect if inlined method has edges to its
4400 // continuation after inlining.
4401 int continuation_preds = cont->number_of_preds();
4402
4403 // Push callee scope
4404 push_scope(callee, cont);
4405
4406 // the BlockListBuilder for the callee could have bailed out
4407 if (bailed_out())
4408 return false;
4409
4410 // Temporarily set up bytecode stream so we can append instructions
4411 // (only using the bci of this stream)
4412 scope_data()->set_stream(scope_data()->parent()->stream());
4413
4414 // Pass parameters into callee state: add assignments
4415 // note: this will also ensure that all arguments are computed before being passed
4416 ValueStack* callee_state = state();
4417 ValueStack* caller_state = state()->caller_state();
4418 for (int i = args_base; i < caller_state->stack_size(); ) {
4419 const int arg_no = i - args_base;
4420 Value arg = caller_state->stack_at_inc(i);
4421 store_local(callee_state, arg, arg_no);
4422 }
4423
4424 // Remove args from stack.
4425 // Note that we preserve locals state in case we can use it later
4426 // (see use of pop_scope() below)
4427 caller_state->truncate_stack(args_base);
4428 assert(callee_state->stack_size() == 0, "callee stack must be empty");
4429
4430 Value lock = nullptr;
4431 BlockBegin* sync_handler = nullptr;
4432
4433 // Inline the locking of the receiver if the callee is synchronized
4434 if (callee->is_synchronized()) {
4435 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror())))
4436 : state()->local_at(0);
4437 sync_handler = new BlockBegin(SynchronizationEntryBCI);
4438 inline_sync_entry(lock, sync_handler);
4439 }
4440
4441 if (compilation()->env()->dtrace_method_probes()) {
4442 Values* args = new Values(1);
4443 args->push(append(new Constant(new MethodConstant(method()))));
4444 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args));
4445 }
4446
4447 if (profile_inlined_calls()) {
4448 profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI));
4449 }
4450
4451 BlockBegin* callee_start_block = block_at(0);
4452 if (callee_start_block != nullptr) {
4453 assert(callee_start_block->is_set(BlockBegin::parser_loop_header_flag), "must be loop header");
4454 Goto* goto_callee = new Goto(callee_start_block, false);
4455 // The state for this goto is in the scope of the callee, so use
4456 // the entry bci for the callee instead of the call site bci.
4457 append_with_bci(goto_callee, 0);
4458 _block->set_end(goto_callee);
4459 callee_start_block->merge(callee_state, compilation()->has_irreducible_loops());
4460
4461 _last = _block = callee_start_block;
4462
4463 scope_data()->add_to_work_list(callee_start_block);
4464 }
4465
4466 // Clear out bytecode stream
4467 scope_data()->set_stream(nullptr);
4468 scope_data()->set_ignore_return(ignore_return);
4469
4470 CompileLog* log = compilation()->log();
4471 if (log != nullptr) log->head("parse method='%d'", log->identify(callee));
4472
4473 // Ready to resume parsing in callee (either in the same block we
4474 // were in before or in the callee's start block)
4475 iterate_all_blocks(callee_start_block == nullptr);
4476
4477 if (log != nullptr) log->done("parse");
4478
4479 // If we bailed out during parsing, return immediately (this is bad news)
4480 if (bailed_out())
4481 return false;
4482
4483 // iterate_all_blocks theoretically traverses in random order; in
4484 // practice, we have only traversed the continuation if we are
4485 // inlining into a subroutine
4486 assert(continuation_existed ||
4487 !continuation()->is_set(BlockBegin::was_visited_flag),
4488 "continuation should not have been parsed yet if we created it");
4489
4490 // At this point we are almost ready to return and resume parsing of
4491 // the caller back in the GraphBuilder. The only thing we want to do
4492 // first is an optimization: during parsing of the callee we
4493 // generated at least one Goto to the continuation block. If we
4494 // generated exactly one, and if the inlined method spanned exactly
4495 // one block (and we didn't have to Goto its entry), then we snip
4496 // off the Goto to the continuation, allowing control to fall
4497 // through back into the caller block and effectively performing
4498 // block merging. This allows load elimination and CSE to take place
4499 // across multiple callee scopes if they are relatively simple, and
4500 // is currently essential to making inlining profitable.
4501 if (num_returns() == 1
4502 && block() == orig_block
4503 && block() == inline_cleanup_block()) {
4504 _last = inline_cleanup_return_prev();
4505 _state = inline_cleanup_state();
4506 } else if (continuation_preds == cont->number_of_preds()) {
4507 // Inlining caused that the instructions after the invoke in the
4508 // caller are not reachable any more. So skip filling this block
4509 // with instructions!
4510 assert(cont == continuation(), "");
4511 assert(_last && _last->as_BlockEnd(), "");
4512 _skip_block = true;
4513 } else {
4514 // Resume parsing in continuation block unless it was already parsed.
4515 // Note that if we don't change _last here, iteration in
4516 // iterate_bytecodes_for_block will stop when we return.
4517 if (!continuation()->is_set(BlockBegin::was_visited_flag)) {
4518 // add continuation to work list instead of parsing it immediately
4519 assert(_last && _last->as_BlockEnd(), "");
4520 scope_data()->parent()->add_to_work_list(continuation());
4521 _skip_block = true;
4522 }
4523 }
4524
4525 // Fill the exception handler for synchronized methods with instructions
4526 if (callee->is_synchronized() && sync_handler->state() != nullptr) {
4527 fill_sync_handler(lock, sync_handler);
4528 } else {
4529 pop_scope();
4530 }
4531
4532 compilation()->notice_inlined_method(callee);
4533
4534 return true;
4535 }
4536
4537
4538 bool GraphBuilder::try_method_handle_inline(ciMethod* callee, bool ignore_return) {
4539 ValueStack* state_before = copy_state_before();
4540 vmIntrinsics::ID iid = callee->intrinsic_id();
4541 switch (iid) {
4542 case vmIntrinsics::_invokeBasic:
4543 {
4544 // get MethodHandle receiver
4545 const int args_base = state()->stack_size() - callee->arg_size();
4546 ValueType* type = state()->stack_at(args_base)->type();
4547 if (type->is_constant()) {
4548 ciObject* mh = type->as_ObjectType()->constant_value();
4549 if (mh->is_method_handle()) {
4550 ciMethod* target = mh->as_method_handle()->get_vmtarget();
4551
4552 // We don't do CHA here so only inline static and statically bindable methods.
4553 if (target->is_static() || target->can_be_statically_bound()) {
4554 if (ciMethod::is_consistent_info(callee, target)) {
4555 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual;
4556 ignore_return = ignore_return || (callee->return_type()->is_void() && !target->return_type()->is_void());
4557 if (try_inline(target, /*holder_known*/ !callee->is_static(), ignore_return, bc)) {
4558 return true;
4559 }
4560 } else {
4561 print_inlining(target, "signatures mismatch", /*success*/ false);
4562 }
4563 } else {
4564 assert(false, "no inlining through MH::invokeBasic"); // missing optimization opportunity due to suboptimal LF shape
4565 print_inlining(target, "not static or statically bindable", /*success*/ false);
4566 }
4567 } else {
4568 assert(mh->is_null_object(), "not a null");
4569 print_inlining(callee, "receiver is always null", /*success*/ false);
4570 }
4571 } else {
4572 print_inlining(callee, "receiver not constant", /*success*/ false);
4573 }
4574 }
4575 break;
4576
4577 case vmIntrinsics::_linkToVirtual:
4578 case vmIntrinsics::_linkToStatic:
4579 case vmIntrinsics::_linkToSpecial:
4580 case vmIntrinsics::_linkToInterface:
4581 {
4582 // pop MemberName argument
4583 const int args_base = state()->stack_size() - callee->arg_size();
4584 ValueType* type = apop()->type();
4585 if (type->is_constant()) {
4586 ciMethod* target = type->as_ObjectType()->constant_value()->as_member_name()->get_vmtarget();
4587 ignore_return = ignore_return || (callee->return_type()->is_void() && !target->return_type()->is_void());
4588 // If the target is another method handle invoke, try to recursively get
4589 // a better target.
4590 if (target->is_method_handle_intrinsic()) {
4591 if (try_method_handle_inline(target, ignore_return)) {
4592 return true;
4593 }
4594 } else if (!ciMethod::is_consistent_info(callee, target)) {
4595 print_inlining(target, "signatures mismatch", /*success*/ false);
4596 } else {
4597 ciSignature* signature = target->signature();
4598 const int receiver_skip = target->is_static() ? 0 : 1;
4599 // Cast receiver to its type.
4600 if (!target->is_static()) {
4601 ciKlass* tk = signature->accessing_klass();
4602 Value obj = state()->stack_at(args_base);
4603 if (obj->exact_type() == nullptr &&
4604 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) {
4605 TypeCast* c = new TypeCast(tk, obj, state_before);
4606 append(c);
4607 state()->stack_at_put(args_base, c);
4608 }
4609 }
4610 // Cast reference arguments to its type.
4611 for (int i = 0, j = 0; i < signature->count(); i++) {
4612 ciType* t = signature->type_at(i);
4613 if (t->is_klass()) {
4614 ciKlass* tk = t->as_klass();
4615 Value obj = state()->stack_at(args_base + receiver_skip + j);
4616 if (obj->exact_type() == nullptr &&
4617 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) {
4618 TypeCast* c = new TypeCast(t, obj, state_before);
4619 append(c);
4620 state()->stack_at_put(args_base + receiver_skip + j, c);
4621 }
4622 }
4623 j += t->size(); // long and double take two slots
4624 }
4625 // We don't do CHA here so only inline static and statically bindable methods.
4626 if (target->is_static() || target->can_be_statically_bound()) {
4627 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual;
4628 if (try_inline(target, /*holder_known*/ !callee->is_static(), ignore_return, bc)) {
4629 return true;
4630 }
4631 } else {
4632 print_inlining(target, "not static or statically bindable", /*success*/ false);
4633 }
4634 }
4635 } else {
4636 print_inlining(callee, "MemberName not constant", /*success*/ false);
4637 }
4638 }
4639 break;
4640
4641 case vmIntrinsics::_linkToNative:
4642 print_inlining(callee, "native call", /*success*/ false);
4643 break;
4644
4645 default:
4646 fatal("unexpected intrinsic %d: %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
4647 break;
4648 }
4649 set_state(state_before->copy_for_parsing());
4650 return false;
4651 }
4652
4653
4654 void GraphBuilder::inline_bailout(const char* msg) {
4655 assert(msg != nullptr, "inline bailout msg must exist");
4656 _inline_bailout_msg = msg;
4657 }
4658
4659
4660 void GraphBuilder::clear_inline_bailout() {
4661 _inline_bailout_msg = nullptr;
4662 }
4663
4664
4665 void GraphBuilder::push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start) {
4666 ScopeData* data = new ScopeData(nullptr);
4667 data->set_scope(scope);
4668 data->set_bci2block(bci2block);
4669 _scope_data = data;
4670 _block = start;
4671 }
4672
4673
4674 void GraphBuilder::push_scope(ciMethod* callee, BlockBegin* continuation) {
4675 IRScope* callee_scope = new IRScope(compilation(), scope(), bci(), callee, -1, false);
4676 scope()->add_callee(callee_scope);
4677
4678 BlockListBuilder blb(compilation(), callee_scope, -1);
4679 CHECK_BAILOUT();
4680
4681 if (!blb.bci2block()->at(0)->is_set(BlockBegin::parser_loop_header_flag)) {
4682 // this scope can be inlined directly into the caller so remove
4683 // the block at bci 0.
4684 blb.bci2block()->at_put(0, nullptr);
4685 }
4686
4687 set_state(new ValueStack(callee_scope, state()->copy(ValueStack::CallerState, bci())));
4688
4689 ScopeData* data = new ScopeData(scope_data());
4690 data->set_scope(callee_scope);
4691 data->set_bci2block(blb.bci2block());
4692 data->set_continuation(continuation);
4693 _scope_data = data;
4694 }
4695
4696
4697 void GraphBuilder::push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci) {
4698 ScopeData* data = new ScopeData(scope_data());
4699 data->set_parsing_jsr();
4700 data->set_jsr_entry_bci(jsr_dest_bci);
4701 data->set_jsr_return_address_local(-1);
4702 // Must clone bci2block list as we will be mutating it in order to
4703 // properly clone all blocks in jsr region as well as exception
4704 // handlers containing rets
4705 BlockList* new_bci2block = new BlockList(bci2block()->length());
4706 new_bci2block->appendAll(bci2block());
4707 data->set_bci2block(new_bci2block);
4708 data->set_scope(scope());
4709 data->setup_jsr_xhandlers();
4710 data->set_continuation(continuation());
4711 data->set_jsr_continuation(jsr_continuation);
4712 _scope_data = data;
4713 }
4714
4715
4716 void GraphBuilder::pop_scope() {
4717 int number_of_locks = scope()->number_of_locks();
4718 _scope_data = scope_data()->parent();
4719 // accumulate minimum number of monitor slots to be reserved
4720 scope()->set_min_number_of_locks(number_of_locks);
4721 }
4722
4723
4724 void GraphBuilder::pop_scope_for_jsr() {
4725 _scope_data = scope_data()->parent();
4726 }
4727
4728 void GraphBuilder::append_unsafe_get(ciMethod* callee, BasicType t, bool is_volatile) {
4729 Values* args = state()->pop_arguments(callee->arg_size());
4730 null_check(args->at(0));
4731 Instruction* offset = args->at(2);
4732 #ifndef _LP64
4733 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4734 #endif
4735 Instruction* op = append(new UnsafeGet(t, args->at(1), offset, is_volatile));
4736 push(op->type(), op);
4737 compilation()->set_has_unsafe_access(true);
4738 }
4739
4740
4741 void GraphBuilder::append_unsafe_put(ciMethod* callee, BasicType t, bool is_volatile) {
4742 Values* args = state()->pop_arguments(callee->arg_size());
4743 null_check(args->at(0));
4744 Instruction* offset = args->at(2);
4745 #ifndef _LP64
4746 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4747 #endif
4748 Value val = args->at(3);
4749 if (t == T_BOOLEAN) {
4750 Value mask = append(new Constant(new IntConstant(1)));
4751 val = append(new LogicOp(Bytecodes::_iand, val, mask));
4752 }
4753 Instruction* op = append(new UnsafePut(t, args->at(1), offset, val, is_volatile));
4754 compilation()->set_has_unsafe_access(true);
4755 kill_all();
4756 }
4757
4758 void GraphBuilder::append_unsafe_CAS(ciMethod* callee) {
4759 ValueStack* state_before = copy_state_for_exception();
4760 ValueType* result_type = as_ValueType(callee->return_type());
4761 assert(result_type->is_int(), "int result");
4762 Values* args = state()->pop_arguments(callee->arg_size());
4763
4764 // Pop off some args to specially handle, then push back
4765 Value newval = args->pop();
4766 Value cmpval = args->pop();
4767 Value offset = args->pop();
4768 Value src = args->pop();
4769 Value unsafe_obj = args->pop();
4770
4771 // Separately handle the unsafe arg. It is not needed for code
4772 // generation, but must be null checked
4773 null_check(unsafe_obj);
4774
4775 #ifndef _LP64
4776 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4777 #endif
4778
4779 args->push(src);
4780 args->push(offset);
4781 args->push(cmpval);
4782 args->push(newval);
4783
4784 // An unsafe CAS can alias with other field accesses, but we don't
4785 // know which ones so mark the state as no preserved. This will
4786 // cause CSE to invalidate memory across it.
4787 bool preserves_state = false;
4788 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), args, false, state_before, preserves_state);
4789 append_split(result);
4790 push(result_type, result);
4791 compilation()->set_has_unsafe_access(true);
4792 }
4793
4794 void GraphBuilder::append_char_access(ciMethod* callee, bool is_store) {
4795 // This intrinsic accesses byte[] array as char[] array. Computing the offsets
4796 // correctly requires matched array shapes.
4797 assert (arrayOopDesc::base_offset_in_bytes(T_CHAR) == arrayOopDesc::base_offset_in_bytes(T_BYTE),
4798 "sanity: byte[] and char[] bases agree");
4799 assert (type2aelembytes(T_CHAR) == type2aelembytes(T_BYTE)*2,
4800 "sanity: byte[] and char[] scales agree");
4801
4802 ValueStack* state_before = copy_state_indexed_access();
4803 compilation()->set_has_access_indexed(true);
4804 Values* args = state()->pop_arguments(callee->arg_size());
4805 Value array = args->at(0);
4806 Value index = args->at(1);
4807 if (is_store) {
4808 Value value = args->at(2);
4809 Instruction* store = append(new StoreIndexed(array, index, nullptr, T_CHAR, value, state_before, false, true));
4810 store->set_flag(Instruction::NeedsRangeCheckFlag, false);
4811 _memory->store_value(value);
4812 } else {
4813 Instruction* load = append(new LoadIndexed(array, index, nullptr, T_CHAR, state_before, true));
4814 load->set_flag(Instruction::NeedsRangeCheckFlag, false);
4815 push(load->type(), load);
4816 }
4817 }
4818
4819 void GraphBuilder::print_inlining(ciMethod* callee, const char* msg, bool success) {
4820 CompileLog* log = compilation()->log();
4821 if (log != nullptr) {
4822 assert(msg != nullptr, "inlining msg should not be null!");
4823 if (success) {
4824 log->inline_success(msg);
4825 } else {
4826 log->inline_fail(msg);
4827 }
4828 }
4829 EventCompilerInlining event;
4830 if (event.should_commit()) {
4831 CompilerEvent::InlineEvent::post(event, compilation()->env()->task()->compile_id(), method()->get_Method(), callee, success, msg, bci());
4832 }
4833
4834 CompileTask::print_inlining_ul(callee, scope()->level(), bci(), msg);
4835
4836 if (!compilation()->directive()->PrintInliningOption) {
4837 return;
4838 }
4839 CompileTask::print_inlining_tty(callee, scope()->level(), bci(), msg);
4840 if (success && CIPrintMethodCodes) {
4841 callee->print_codes();
4842 }
4843 }
4844
4845 void GraphBuilder::append_unsafe_get_and_set(ciMethod* callee, bool is_add) {
4846 Values* args = state()->pop_arguments(callee->arg_size());
4847 BasicType t = callee->return_type()->basic_type();
4848 null_check(args->at(0));
4849 Instruction* offset = args->at(2);
4850 #ifndef _LP64
4851 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4852 #endif
4853 Instruction* op = append(new UnsafeGetAndSet(t, args->at(1), offset, args->at(3), is_add));
4854 compilation()->set_has_unsafe_access(true);
4855 kill_all();
4856 push(op->type(), op);
4857 }
4858
4859 #ifndef PRODUCT
4860 void GraphBuilder::print_stats() {
4861 vmap()->print();
4862 }
4863 #endif // PRODUCT
4864
4865 void GraphBuilder::profile_call(ciMethod* callee, Value recv, ciKlass* known_holder, Values* obj_args, bool inlined) {
4866 assert(known_holder == nullptr || (known_holder->is_instance_klass() &&
4867 (!known_holder->is_interface() ||
4868 ((ciInstanceKlass*)known_holder)->has_nonstatic_concrete_methods())), "should be non-static concrete method");
4869 if (known_holder != nullptr) {
4870 if (known_holder->exact_klass() == nullptr) {
4871 known_holder = compilation()->cha_exact_type(known_holder);
4872 }
4873 }
4874
4875 append(new ProfileCall(method(), bci(), callee, recv, known_holder, obj_args, inlined));
4876 }
4877
4878 void GraphBuilder::profile_return_type(Value ret, ciMethod* callee, ciMethod* m, int invoke_bci) {
4879 assert((m == nullptr) == (invoke_bci < 0), "invalid method and invalid bci together");
4880 if (m == nullptr) {
4881 m = method();
4882 }
4883 if (invoke_bci < 0) {
4884 invoke_bci = bci();
4885 }
4886 ciMethodData* md = m->method_data_or_null();
4887 ciProfileData* data = md->bci_to_data(invoke_bci);
4888 if (data != nullptr && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) {
4889 bool has_return = data->is_CallTypeData() ? ((ciCallTypeData*)data)->has_return() : ((ciVirtualCallTypeData*)data)->has_return();
4890 if (has_return) {
4891 append(new ProfileReturnType(m , invoke_bci, callee, ret));
4892 }
4893 }
4894 }
4895
4896 void GraphBuilder::profile_invocation(ciMethod* callee, ValueStack* state) {
4897 append(new ProfileInvoke(callee, state));
4898 }