1 /*
2 * Copyright (c) 1999, 2019, 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/ciKlass.hpp"
34 #include "ci/ciMemberName.hpp"
35 #include "ci/ciUtilities.inline.hpp"
36 #include "ci/ciValueKlass.hpp"
37 #include "compiler/compileBroker.hpp"
38 #include "interpreter/bytecode.hpp"
39 #include "jfr/jfrEvents.hpp"
40 #include "memory/resourceArea.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "runtime/sharedRuntime.hpp"
43 #include "runtime/compilationPolicy.hpp"
44 #include "runtime/vm_version.hpp"
45 #include "utilities/bitMap.inline.hpp"
46
47 class BlockListBuilder {
48 private:
49 Compilation* _compilation;
50 IRScope* _scope;
51
52 BlockList _blocks; // internal list of all blocks
53 BlockList* _bci2block; // mapping from bci to blocks for GraphBuilder
54
55 // fields used by mark_loops
56 ResourceBitMap _active; // for iteration of control flow graph
57 ResourceBitMap _visited; // for iteration of control flow graph
58 intArray _loop_map; // caches the information if a block is contained in a loop
59 int _next_loop_index; // next free loop number
60 int _next_block_number; // for reverse postorder numbering of blocks
61
62 // accessors
63 Compilation* compilation() const { return _compilation; }
64 IRScope* scope() const { return _scope; }
65 ciMethod* method() const { return scope()->method(); }
66 XHandlers* xhandlers() const { return scope()->xhandlers(); }
67
68 // unified bailout support
69 void bailout(const char* msg) const { compilation()->bailout(msg); }
70 bool bailed_out() const { return compilation()->bailed_out(); }
71
72 // helper functions
73 BlockBegin* make_block_at(int bci, BlockBegin* predecessor);
74 void handle_exceptions(BlockBegin* current, int cur_bci);
75 void handle_jsr(BlockBegin* current, int sr_bci, int next_bci);
76 void store_one(BlockBegin* current, int local);
77 void store_two(BlockBegin* current, int local);
78 void set_entries(int osr_bci);
79 void set_leaders();
80
81 void make_loop_header(BlockBegin* block);
82 void mark_loops();
83 int mark_loops(BlockBegin* b, bool in_subroutine);
84
85 // debugging
86 #ifndef PRODUCT
87 void print();
88 #endif
89
90 public:
91 // creation
92 BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci);
93
94 // accessors for GraphBuilder
95 BlockList* bci2block() const { return _bci2block; }
96 };
97
98
99 // Implementation of BlockListBuilder
100
101 BlockListBuilder::BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci)
102 : _compilation(compilation)
103 , _scope(scope)
104 , _blocks(16)
105 , _bci2block(new BlockList(scope->method()->code_size(), NULL))
106 , _active() // size not known yet
107 , _visited() // size not known yet
108 , _loop_map() // size not known yet
109 , _next_loop_index(0)
110 , _next_block_number(0)
111 {
112 set_entries(osr_bci);
113 set_leaders();
114 CHECK_BAILOUT();
115
116 mark_loops();
117 NOT_PRODUCT(if (PrintInitialBlockList) print());
118
119 #ifndef PRODUCT
120 if (PrintCFGToFile) {
121 stringStream title;
122 title.print("BlockListBuilder ");
123 scope->method()->print_name(&title);
124 CFGPrinter::print_cfg(_bci2block, title.as_string(), false, false);
125 }
126 #endif
127 }
128
129
130 void BlockListBuilder::set_entries(int osr_bci) {
131 // generate start blocks
132 BlockBegin* std_entry = make_block_at(0, NULL);
133 if (scope()->caller() == NULL) {
134 std_entry->set(BlockBegin::std_entry_flag);
135 }
136 if (osr_bci != -1) {
137 BlockBegin* osr_entry = make_block_at(osr_bci, NULL);
138 osr_entry->set(BlockBegin::osr_entry_flag);
139 }
140
141 // generate exception entry blocks
142 XHandlers* list = xhandlers();
143 const int n = list->length();
144 for (int i = 0; i < n; i++) {
145 XHandler* h = list->handler_at(i);
146 BlockBegin* entry = make_block_at(h->handler_bci(), NULL);
147 entry->set(BlockBegin::exception_entry_flag);
148 h->set_entry_block(entry);
149 }
150 }
151
152
153 BlockBegin* BlockListBuilder::make_block_at(int cur_bci, BlockBegin* predecessor) {
154 assert(method()->bci_block_start().at(cur_bci), "wrong block starts of MethodLivenessAnalyzer");
155
156 BlockBegin* block = _bci2block->at(cur_bci);
157 if (block == NULL) {
158 block = new BlockBegin(cur_bci);
159 block->init_stores_to_locals(method()->max_locals());
160 _bci2block->at_put(cur_bci, block);
161 _blocks.append(block);
162
163 assert(predecessor == NULL || predecessor->bci() < cur_bci, "targets for backward branches must already exist");
164 }
165
166 if (predecessor != NULL) {
167 if (block->is_set(BlockBegin::exception_entry_flag)) {
168 BAILOUT_("Exception handler can be reached by both normal and exceptional control flow", block);
169 }
170
171 predecessor->add_successor(block);
172 block->increment_total_preds();
173 }
174
175 return block;
176 }
177
178
179 inline void BlockListBuilder::store_one(BlockBegin* current, int local) {
180 current->stores_to_locals().set_bit(local);
181 }
182 inline void BlockListBuilder::store_two(BlockBegin* current, int local) {
183 store_one(current, local);
184 store_one(current, local + 1);
185 }
186
187
188 void BlockListBuilder::handle_exceptions(BlockBegin* current, int cur_bci) {
189 // Draws edges from a block to its exception handlers
190 XHandlers* list = xhandlers();
191 const int n = list->length();
192
193 for (int i = 0; i < n; i++) {
194 XHandler* h = list->handler_at(i);
195
196 if (h->covers(cur_bci)) {
197 BlockBegin* entry = h->entry_block();
198 assert(entry != NULL && entry == _bci2block->at(h->handler_bci()), "entry must be set");
199 assert(entry->is_set(BlockBegin::exception_entry_flag), "flag must be set");
200
201 // add each exception handler only once
202 if (!current->is_successor(entry)) {
203 current->add_successor(entry);
204 entry->increment_total_preds();
205 }
206
207 // stop when reaching catchall
208 if (h->catch_type() == 0) break;
209 }
210 }
211 }
212
213 void BlockListBuilder::handle_jsr(BlockBegin* current, int sr_bci, int next_bci) {
214 // start a new block after jsr-bytecode and link this block into cfg
215 make_block_at(next_bci, current);
216
217 // start a new block at the subroutine entry at mark it with special flag
218 BlockBegin* sr_block = make_block_at(sr_bci, current);
219 if (!sr_block->is_set(BlockBegin::subroutine_entry_flag)) {
220 sr_block->set(BlockBegin::subroutine_entry_flag);
221 }
222 }
223
224
225 void BlockListBuilder::set_leaders() {
226 bool has_xhandlers = xhandlers()->has_handlers();
227 BlockBegin* current = NULL;
228
229 // The information which bci starts a new block simplifies the analysis
230 // Without it, backward branches could jump to a bci where no block was created
231 // during bytecode iteration. This would require the creation of a new block at the
232 // branch target and a modification of the successor lists.
233 const BitMap& bci_block_start = method()->bci_block_start();
234
235 ciBytecodeStream s(method());
236 while (s.next() != ciBytecodeStream::EOBC()) {
237 int cur_bci = s.cur_bci();
238
239 if (bci_block_start.at(cur_bci)) {
240 current = make_block_at(cur_bci, current);
241 }
242 assert(current != NULL, "must have current block");
243
244 if (has_xhandlers && GraphBuilder::can_trap(method(), s.cur_bc())) {
245 handle_exceptions(current, cur_bci);
246 }
247
248 switch (s.cur_bc()) {
249 // track stores to local variables for selective creation of phi functions
250 case Bytecodes::_iinc: store_one(current, s.get_index()); break;
251 case Bytecodes::_istore: store_one(current, s.get_index()); break;
252 case Bytecodes::_lstore: store_two(current, s.get_index()); break;
253 case Bytecodes::_fstore: store_one(current, s.get_index()); break;
254 case Bytecodes::_dstore: store_two(current, s.get_index()); break;
255 case Bytecodes::_astore: store_one(current, s.get_index()); break;
256 case Bytecodes::_istore_0: store_one(current, 0); break;
257 case Bytecodes::_istore_1: store_one(current, 1); break;
258 case Bytecodes::_istore_2: store_one(current, 2); break;
259 case Bytecodes::_istore_3: store_one(current, 3); break;
260 case Bytecodes::_lstore_0: store_two(current, 0); break;
261 case Bytecodes::_lstore_1: store_two(current, 1); break;
262 case Bytecodes::_lstore_2: store_two(current, 2); break;
263 case Bytecodes::_lstore_3: store_two(current, 3); break;
264 case Bytecodes::_fstore_0: store_one(current, 0); break;
265 case Bytecodes::_fstore_1: store_one(current, 1); break;
266 case Bytecodes::_fstore_2: store_one(current, 2); break;
267 case Bytecodes::_fstore_3: store_one(current, 3); break;
268 case Bytecodes::_dstore_0: store_two(current, 0); break;
269 case Bytecodes::_dstore_1: store_two(current, 1); break;
270 case Bytecodes::_dstore_2: store_two(current, 2); break;
271 case Bytecodes::_dstore_3: store_two(current, 3); break;
272 case Bytecodes::_astore_0: store_one(current, 0); break;
273 case Bytecodes::_astore_1: store_one(current, 1); break;
274 case Bytecodes::_astore_2: store_one(current, 2); break;
275 case Bytecodes::_astore_3: store_one(current, 3); break;
276
277 // track bytecodes that affect the control flow
278 case Bytecodes::_athrow: // fall through
279 case Bytecodes::_ret: // fall through
280 case Bytecodes::_ireturn: // fall through
281 case Bytecodes::_lreturn: // fall through
282 case Bytecodes::_freturn: // fall through
283 case Bytecodes::_dreturn: // fall through
284 case Bytecodes::_areturn: // fall through
285 case Bytecodes::_return:
286 current = NULL;
287 break;
288
289 case Bytecodes::_ifeq: // fall through
290 case Bytecodes::_ifne: // fall through
291 case Bytecodes::_iflt: // fall through
292 case Bytecodes::_ifge: // fall through
293 case Bytecodes::_ifgt: // fall through
294 case Bytecodes::_ifle: // fall through
295 case Bytecodes::_if_icmpeq: // fall through
296 case Bytecodes::_if_icmpne: // fall through
297 case Bytecodes::_if_icmplt: // fall through
298 case Bytecodes::_if_icmpge: // fall through
299 case Bytecodes::_if_icmpgt: // fall through
300 case Bytecodes::_if_icmple: // fall through
301 case Bytecodes::_if_acmpeq: // fall through
302 case Bytecodes::_if_acmpne: // fall through
303 case Bytecodes::_ifnull: // fall through
304 case Bytecodes::_ifnonnull:
305 make_block_at(s.next_bci(), current);
306 make_block_at(s.get_dest(), current);
307 current = NULL;
308 break;
309
310 case Bytecodes::_goto:
311 make_block_at(s.get_dest(), current);
312 current = NULL;
313 break;
314
315 case Bytecodes::_goto_w:
316 make_block_at(s.get_far_dest(), current);
317 current = NULL;
318 break;
319
320 case Bytecodes::_jsr:
321 handle_jsr(current, s.get_dest(), s.next_bci());
322 current = NULL;
323 break;
324
325 case Bytecodes::_jsr_w:
326 handle_jsr(current, s.get_far_dest(), s.next_bci());
327 current = NULL;
328 break;
329
330 case Bytecodes::_tableswitch: {
331 // set block for each case
332 Bytecode_tableswitch sw(&s);
333 int l = sw.length();
334 for (int i = 0; i < l; i++) {
335 make_block_at(cur_bci + sw.dest_offset_at(i), current);
336 }
337 make_block_at(cur_bci + sw.default_offset(), current);
338 current = NULL;
339 break;
340 }
341
342 case Bytecodes::_lookupswitch: {
343 // set block for each case
344 Bytecode_lookupswitch sw(&s);
345 int l = sw.number_of_pairs();
346 for (int i = 0; i < l; i++) {
347 make_block_at(cur_bci + sw.pair_at(i).offset(), current);
348 }
349 make_block_at(cur_bci + sw.default_offset(), current);
350 current = NULL;
351 break;
352 }
353
354 default:
355 break;
356 }
357 }
358 }
359
360
361 void BlockListBuilder::mark_loops() {
362 ResourceMark rm;
363
364 _active.initialize(BlockBegin::number_of_blocks());
365 _visited.initialize(BlockBegin::number_of_blocks());
366 _loop_map = intArray(BlockBegin::number_of_blocks(), BlockBegin::number_of_blocks(), 0);
367 _next_loop_index = 0;
368 _next_block_number = _blocks.length();
369
370 // recursively iterate the control flow graph
371 mark_loops(_bci2block->at(0), false);
372 assert(_next_block_number >= 0, "invalid block numbers");
373
374 // Remove dangling Resource pointers before the ResourceMark goes out-of-scope.
375 _active.resize(0);
376 _visited.resize(0);
377 }
378
379 void BlockListBuilder::make_loop_header(BlockBegin* block) {
380 if (block->is_set(BlockBegin::exception_entry_flag)) {
381 // exception edges may look like loops but don't mark them as such
382 // since it screws up block ordering.
383 return;
384 }
385 if (!block->is_set(BlockBegin::parser_loop_header_flag)) {
386 block->set(BlockBegin::parser_loop_header_flag);
387
388 assert(_loop_map.at(block->block_id()) == 0, "must not be set yet");
389 assert(0 <= _next_loop_index && _next_loop_index < BitsPerInt, "_next_loop_index is used as a bit-index in integer");
390 _loop_map.at_put(block->block_id(), 1 << _next_loop_index);
391 if (_next_loop_index < 31) _next_loop_index++;
392 } else {
393 // block already marked as loop header
394 assert(is_power_of_2((unsigned int)_loop_map.at(block->block_id())), "exactly one bit must be set");
395 }
396 }
397
398 int BlockListBuilder::mark_loops(BlockBegin* block, bool in_subroutine) {
399 int block_id = block->block_id();
400
401 if (_visited.at(block_id)) {
402 if (_active.at(block_id)) {
403 // reached block via backward branch
404 make_loop_header(block);
405 }
406 // return cached loop information for this block
407 return _loop_map.at(block_id);
408 }
409
410 if (block->is_set(BlockBegin::subroutine_entry_flag)) {
411 in_subroutine = true;
412 }
413
414 // set active and visited bits before successors are processed
415 _visited.set_bit(block_id);
416 _active.set_bit(block_id);
417
418 intptr_t loop_state = 0;
419 for (int i = block->number_of_sux() - 1; i >= 0; i--) {
420 // recursively process all successors
421 loop_state |= mark_loops(block->sux_at(i), in_subroutine);
422 }
423
424 // clear active-bit after all successors are processed
425 _active.clear_bit(block_id);
426
427 // reverse-post-order numbering of all blocks
428 block->set_depth_first_number(_next_block_number);
429 _next_block_number--;
430
431 if (loop_state != 0 || in_subroutine ) {
432 // block is contained at least in one loop, so phi functions are necessary
433 // phi functions are also necessary for all locals stored in a subroutine
434 scope()->requires_phi_function().set_union(block->stores_to_locals());
435 }
436
437 if (block->is_set(BlockBegin::parser_loop_header_flag)) {
438 int header_loop_state = _loop_map.at(block_id);
439 assert(is_power_of_2((unsigned)header_loop_state), "exactly one bit must be set");
440
441 // If the highest bit is set (i.e. when integer value is negative), the method
442 // has 32 or more loops. This bit is never cleared because it is used for multiple loops
443 if (header_loop_state >= 0) {
444 clear_bits(loop_state, header_loop_state);
445 }
446 }
447
448 // cache and return loop information for this block
449 _loop_map.at_put(block_id, loop_state);
450 return loop_state;
451 }
452
453
454 #ifndef PRODUCT
455
456 int compare_depth_first(BlockBegin** a, BlockBegin** b) {
457 return (*a)->depth_first_number() - (*b)->depth_first_number();
458 }
459
460 void BlockListBuilder::print() {
461 tty->print("----- initial block list of BlockListBuilder for method ");
462 method()->print_short_name();
463 tty->cr();
464
465 // better readability if blocks are sorted in processing order
466 _blocks.sort(compare_depth_first);
467
468 for (int i = 0; i < _blocks.length(); i++) {
469 BlockBegin* cur = _blocks.at(i);
470 tty->print("%4d: B%-4d bci: %-4d preds: %-4d ", cur->depth_first_number(), cur->block_id(), cur->bci(), cur->total_preds());
471
472 tty->print(cur->is_set(BlockBegin::std_entry_flag) ? " std" : " ");
473 tty->print(cur->is_set(BlockBegin::osr_entry_flag) ? " osr" : " ");
474 tty->print(cur->is_set(BlockBegin::exception_entry_flag) ? " ex" : " ");
475 tty->print(cur->is_set(BlockBegin::subroutine_entry_flag) ? " sr" : " ");
476 tty->print(cur->is_set(BlockBegin::parser_loop_header_flag) ? " lh" : " ");
477
478 if (cur->number_of_sux() > 0) {
479 tty->print(" sux: ");
480 for (int j = 0; j < cur->number_of_sux(); j++) {
481 BlockBegin* sux = cur->sux_at(j);
482 tty->print("B%d ", sux->block_id());
483 }
484 }
485 tty->cr();
486 }
487 }
488
489 #endif
490
491
492 // A simple growable array of Values indexed by ciFields
493 class FieldBuffer: public CompilationResourceObj {
494 private:
495 GrowableArray<Value> _values;
496
497 public:
498 FieldBuffer() {}
499
500 void kill() {
501 _values.trunc_to(0);
502 }
503
504 Value at(ciField* field) {
505 assert(field->holder()->is_loaded(), "must be a loaded field");
506 int offset = field->offset();
507 if (offset < _values.length()) {
508 return _values.at(offset);
509 } else {
510 return NULL;
511 }
512 }
513
514 void at_put(ciField* field, Value value) {
515 assert(field->holder()->is_loaded(), "must be a loaded field");
516 int offset = field->offset();
517 _values.at_put_grow(offset, value, NULL);
518 }
519
520 };
521
522
523 // MemoryBuffer is fairly simple model of the current state of memory.
524 // It partitions memory into several pieces. The first piece is
525 // generic memory where little is known about the owner of the memory.
526 // This is conceptually represented by the tuple <O, F, V> which says
527 // that the field F of object O has value V. This is flattened so
528 // that F is represented by the offset of the field and the parallel
529 // arrays _objects and _values are used for O and V. Loads of O.F can
530 // simply use V. Newly allocated objects are kept in a separate list
531 // along with a parallel array for each object which represents the
532 // current value of its fields. Stores of the default value to fields
533 // which have never been stored to before are eliminated since they
534 // are redundant. Once newly allocated objects are stored into
535 // another object or they are passed out of the current compile they
536 // are treated like generic memory.
537
538 class MemoryBuffer: public CompilationResourceObj {
539 private:
540 FieldBuffer _values;
541 GrowableArray<Value> _objects;
542 GrowableArray<Value> _newobjects;
543 GrowableArray<FieldBuffer*> _fields;
544
545 public:
546 MemoryBuffer() {}
547
548 StoreField* store(StoreField* st) {
549 if (!EliminateFieldAccess) {
550 return st;
551 }
552
553 Value object = st->obj();
554 Value value = st->value();
555 ciField* field = st->field();
556 if (field->holder()->is_loaded()) {
557 int offset = field->offset();
558 int index = _newobjects.find(object);
559 if (index != -1) {
560 // newly allocated object with no other stores performed on this field
561 FieldBuffer* buf = _fields.at(index);
562 if (buf->at(field) == NULL && is_default_value(value)) {
563 #ifndef PRODUCT
564 if (PrintIRDuringConstruction && Verbose) {
565 tty->print_cr("Eliminated store for object %d:", index);
566 st->print_line();
567 }
568 #endif
569 return NULL;
570 } else {
571 buf->at_put(field, value);
572 }
573 } else {
574 _objects.at_put_grow(offset, object, NULL);
575 _values.at_put(field, value);
576 }
577
578 store_value(value);
579 } else {
580 // if we held onto field names we could alias based on names but
581 // we don't know what's being stored to so kill it all.
582 kill();
583 }
584 return st;
585 }
586
587
588 // return true if this value correspond to the default value of a field.
589 bool is_default_value(Value value) {
590 Constant* con = value->as_Constant();
591 if (con) {
592 switch (con->type()->tag()) {
593 case intTag: return con->type()->as_IntConstant()->value() == 0;
594 case longTag: return con->type()->as_LongConstant()->value() == 0;
595 case floatTag: return jint_cast(con->type()->as_FloatConstant()->value()) == 0;
596 case doubleTag: return jlong_cast(con->type()->as_DoubleConstant()->value()) == jlong_cast(0);
597 case objectTag: return con->type() == objectNull;
598 default: ShouldNotReachHere();
599 }
600 }
601 return false;
602 }
603
604
605 // return either the actual value of a load or the load itself
606 Value load(LoadField* load) {
607 if (!EliminateFieldAccess) {
608 return load;
609 }
610
611 if (RoundFPResults && UseSSE < 2 && load->type()->is_float_kind()) {
612 // can't skip load since value might get rounded as a side effect
613 return load;
614 }
615
616 ciField* field = load->field();
617 Value object = load->obj();
618 if (field->holder()->is_loaded() && !field->is_volatile()) {
619 int offset = field->offset();
620 Value result = NULL;
621 int index = _newobjects.find(object);
622 if (index != -1) {
623 result = _fields.at(index)->at(field);
624 } else if (_objects.at_grow(offset, NULL) == object) {
625 result = _values.at(field);
626 }
627 if (result != NULL) {
628 #ifndef PRODUCT
629 if (PrintIRDuringConstruction && Verbose) {
630 tty->print_cr("Eliminated load: ");
631 load->print_line();
632 }
633 #endif
634 assert(result->type()->tag() == load->type()->tag(), "wrong types");
635 return result;
636 }
637 }
638 return load;
639 }
640
641 // Record this newly allocated object
642 void new_instance(NewInstance* object) {
643 int index = _newobjects.length();
644 _newobjects.append(object);
645 if (_fields.at_grow(index, NULL) == NULL) {
646 _fields.at_put(index, new FieldBuffer());
647 } else {
648 _fields.at(index)->kill();
649 }
650 }
651
652 // Record this newly allocated object
653 void new_instance(NewValueTypeInstance* object) {
654 int index = _newobjects.length();
655 _newobjects.append(object);
656 if (_fields.at_grow(index, NULL) == NULL) {
657 _fields.at_put(index, new FieldBuffer());
658 } else {
659 _fields.at(index)->kill();
660 }
661 }
662
663 void store_value(Value value) {
664 int index = _newobjects.find(value);
665 if (index != -1) {
666 // stored a newly allocated object into another object.
667 // Assume we've lost track of it as separate slice of memory.
668 // We could do better by keeping track of whether individual
669 // fields could alias each other.
670 _newobjects.remove_at(index);
671 // pull out the field info and store it at the end up the list
672 // of field info list to be reused later.
673 _fields.append(_fields.at(index));
674 _fields.remove_at(index);
675 }
676 }
677
678 void kill() {
679 _newobjects.trunc_to(0);
680 _objects.trunc_to(0);
681 _values.kill();
682 }
683 };
684
685
686 // Implementation of GraphBuilder's ScopeData
687
688 GraphBuilder::ScopeData::ScopeData(ScopeData* parent)
689 : _parent(parent)
690 , _bci2block(NULL)
691 , _scope(NULL)
692 , _has_handler(false)
693 , _stream(NULL)
694 , _work_list(NULL)
695 , _caller_stack_size(-1)
696 , _continuation(NULL)
697 , _parsing_jsr(false)
698 , _jsr_xhandlers(NULL)
699 , _num_returns(0)
700 , _cleanup_block(NULL)
701 , _cleanup_return_prev(NULL)
702 , _cleanup_state(NULL)
703 , _ignore_return(false)
704 {
705 if (parent != NULL) {
706 _max_inline_size = (intx) ((float) NestedInliningSizeRatio * (float) parent->max_inline_size() / 100.0f);
707 } else {
708 _max_inline_size = MaxInlineSize;
709 }
710 if (_max_inline_size < MaxTrivialSize) {
711 _max_inline_size = MaxTrivialSize;
712 }
713 }
714
715
716 void GraphBuilder::kill_all() {
717 if (UseLocalValueNumbering) {
718 vmap()->kill_all();
719 }
720 _memory->kill();
721 }
722
723
724 BlockBegin* GraphBuilder::ScopeData::block_at(int bci) {
725 if (parsing_jsr()) {
726 // It is necessary to clone all blocks associated with a
727 // subroutine, including those for exception handlers in the scope
728 // of the method containing the jsr (because those exception
729 // handlers may contain ret instructions in some cases).
730 BlockBegin* block = bci2block()->at(bci);
731 if (block != NULL && block == parent()->bci2block()->at(bci)) {
732 BlockBegin* new_block = new BlockBegin(block->bci());
733 if (PrintInitialBlockList) {
734 tty->print_cr("CFG: cloned block %d (bci %d) as block %d for jsr",
735 block->block_id(), block->bci(), new_block->block_id());
736 }
737 // copy data from cloned blocked
738 new_block->set_depth_first_number(block->depth_first_number());
739 if (block->is_set(BlockBegin::parser_loop_header_flag)) new_block->set(BlockBegin::parser_loop_header_flag);
740 // Preserve certain flags for assertion checking
741 if (block->is_set(BlockBegin::subroutine_entry_flag)) new_block->set(BlockBegin::subroutine_entry_flag);
742 if (block->is_set(BlockBegin::exception_entry_flag)) new_block->set(BlockBegin::exception_entry_flag);
743
744 // copy was_visited_flag to allow early detection of bailouts
745 // if a block that is used in a jsr has already been visited before,
746 // it is shared between the normal control flow and a subroutine
747 // BlockBegin::try_merge returns false when the flag is set, this leads
748 // to a compilation bailout
749 if (block->is_set(BlockBegin::was_visited_flag)) new_block->set(BlockBegin::was_visited_flag);
750
751 bci2block()->at_put(bci, new_block);
752 block = new_block;
753 }
754 return block;
755 } else {
756 return bci2block()->at(bci);
757 }
758 }
759
760
761 XHandlers* GraphBuilder::ScopeData::xhandlers() const {
762 if (_jsr_xhandlers == NULL) {
763 assert(!parsing_jsr(), "");
764 return scope()->xhandlers();
765 }
766 assert(parsing_jsr(), "");
767 return _jsr_xhandlers;
768 }
769
770
771 void GraphBuilder::ScopeData::set_scope(IRScope* scope) {
772 _scope = scope;
773 bool parent_has_handler = false;
774 if (parent() != NULL) {
775 parent_has_handler = parent()->has_handler();
776 }
777 _has_handler = parent_has_handler || scope->xhandlers()->has_handlers();
778 }
779
780
781 void GraphBuilder::ScopeData::set_inline_cleanup_info(BlockBegin* block,
782 Instruction* return_prev,
783 ValueStack* return_state) {
784 _cleanup_block = block;
785 _cleanup_return_prev = return_prev;
786 _cleanup_state = return_state;
787 }
788
789
790 void GraphBuilder::ScopeData::add_to_work_list(BlockBegin* block) {
791 if (_work_list == NULL) {
792 _work_list = new BlockList();
793 }
794
795 if (!block->is_set(BlockBegin::is_on_work_list_flag)) {
796 // Do not start parsing the continuation block while in a
797 // sub-scope
798 if (parsing_jsr()) {
799 if (block == jsr_continuation()) {
800 return;
801 }
802 } else {
803 if (block == continuation()) {
804 return;
805 }
806 }
807 block->set(BlockBegin::is_on_work_list_flag);
808 _work_list->push(block);
809
810 sort_top_into_worklist(_work_list, block);
811 }
812 }
813
814
815 void GraphBuilder::sort_top_into_worklist(BlockList* worklist, BlockBegin* top) {
816 assert(worklist->top() == top, "");
817 // sort block descending into work list
818 const int dfn = top->depth_first_number();
819 assert(dfn != -1, "unknown depth first number");
820 int i = worklist->length()-2;
821 while (i >= 0) {
822 BlockBegin* b = worklist->at(i);
823 if (b->depth_first_number() < dfn) {
824 worklist->at_put(i+1, b);
825 } else {
826 break;
827 }
828 i --;
829 }
830 if (i >= -1) worklist->at_put(i + 1, top);
831 }
832
833
834 BlockBegin* GraphBuilder::ScopeData::remove_from_work_list() {
835 if (is_work_list_empty()) {
836 return NULL;
837 }
838 return _work_list->pop();
839 }
840
841
842 bool GraphBuilder::ScopeData::is_work_list_empty() const {
843 return (_work_list == NULL || _work_list->length() == 0);
844 }
845
846
847 void GraphBuilder::ScopeData::setup_jsr_xhandlers() {
848 assert(parsing_jsr(), "");
849 // clone all the exception handlers from the scope
850 XHandlers* handlers = new XHandlers(scope()->xhandlers());
851 const int n = handlers->length();
852 for (int i = 0; i < n; i++) {
853 // The XHandlers need to be adjusted to dispatch to the cloned
854 // handler block instead of the default one but the synthetic
855 // unlocker needs to be handled specially. The synthetic unlocker
856 // should be left alone since there can be only one and all code
857 // should dispatch to the same one.
858 XHandler* h = handlers->handler_at(i);
859 assert(h->handler_bci() != SynchronizationEntryBCI, "must be real");
860 h->set_entry_block(block_at(h->handler_bci()));
861 }
862 _jsr_xhandlers = handlers;
863 }
864
865
866 int GraphBuilder::ScopeData::num_returns() {
867 if (parsing_jsr()) {
868 return parent()->num_returns();
869 }
870 return _num_returns;
871 }
872
873
874 void GraphBuilder::ScopeData::incr_num_returns() {
875 if (parsing_jsr()) {
876 parent()->incr_num_returns();
877 } else {
878 ++_num_returns;
879 }
880 }
881
882
883 // Implementation of GraphBuilder
884
885 #define INLINE_BAILOUT(msg) { inline_bailout(msg); return false; }
886
887
888 void GraphBuilder::load_constant() {
889 ciConstant con = stream()->get_constant();
890 if (con.basic_type() == T_ILLEGAL) {
891 // FIXME: an unresolved Dynamic constant can get here,
892 // and that should not terminate the whole compilation.
893 BAILOUT("could not resolve a constant");
894 } else {
895 ValueType* t = illegalType;
896 ValueStack* patch_state = NULL;
897 switch (con.basic_type()) {
898 case T_BOOLEAN: t = new IntConstant (con.as_boolean()); break;
899 case T_BYTE : t = new IntConstant (con.as_byte ()); break;
900 case T_CHAR : t = new IntConstant (con.as_char ()); break;
901 case T_SHORT : t = new IntConstant (con.as_short ()); break;
902 case T_INT : t = new IntConstant (con.as_int ()); break;
903 case T_LONG : t = new LongConstant (con.as_long ()); break;
904 case T_FLOAT : t = new FloatConstant (con.as_float ()); break;
905 case T_DOUBLE : t = new DoubleConstant (con.as_double ()); break;
906 case T_ARRAY : t = new ArrayConstant (con.as_object ()->as_array ()); break;
907 case T_OBJECT :
908 {
909 ciObject* obj = con.as_object();
910 if (!obj->is_loaded()
911 || (PatchALot && obj->klass() != ciEnv::current()->String_klass())) {
912 // A Class, MethodType, MethodHandle, or String.
913 // Unloaded condy nodes show up as T_ILLEGAL, above.
914 patch_state = copy_state_before();
915 t = new ObjectConstant(obj);
916 } else {
917 // Might be a Class, MethodType, MethodHandle, or Dynamic constant
918 // result, which might turn out to be an array.
919 if (obj->is_null_object())
920 t = objectNull;
921 else if (obj->is_array())
922 t = new ArrayConstant(obj->as_array());
923 else
924 t = new InstanceConstant(obj->as_instance());
925 }
926 break;
927 }
928 default : ShouldNotReachHere();
929 }
930 Value x;
931 if (patch_state != NULL) {
932 x = new Constant(t, patch_state);
933 } else {
934 x = new Constant(t);
935 }
936 push(t, append(x));
937 }
938 }
939
940
941 void GraphBuilder::load_local(ValueType* type, int index) {
942 Value x = state()->local_at(index);
943 assert(x != NULL && !x->type()->is_illegal(), "access of illegal local variable");
944 push(type, x);
945 }
946
947
948 void GraphBuilder::store_local(ValueType* type, int index) {
949 Value x = pop(type);
950 store_local(state(), x, index);
951 }
952
953
954 void GraphBuilder::store_local(ValueStack* state, Value x, int index) {
955 if (parsing_jsr()) {
956 // We need to do additional tracking of the location of the return
957 // address for jsrs since we don't handle arbitrary jsr/ret
958 // constructs. Here we are figuring out in which circumstances we
959 // need to bail out.
960 if (x->type()->is_address()) {
961 scope_data()->set_jsr_return_address_local(index);
962
963 // Also check parent jsrs (if any) at this time to see whether
964 // they are using this local. We don't handle skipping over a
965 // ret.
966 for (ScopeData* cur_scope_data = scope_data()->parent();
967 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
968 cur_scope_data = cur_scope_data->parent()) {
969 if (cur_scope_data->jsr_return_address_local() == index) {
970 BAILOUT("subroutine overwrites return address from previous subroutine");
971 }
972 }
973 } else if (index == scope_data()->jsr_return_address_local()) {
974 scope_data()->set_jsr_return_address_local(-1);
975 }
976 }
977
978 state->store_local(index, round_fp(x));
979 }
980
981
982 void GraphBuilder::load_indexed(BasicType type) {
983 // In case of in block code motion in range check elimination
984 ValueStack* state_before = copy_state_indexed_access();
985 compilation()->set_has_access_indexed(true);
986 Value index = ipop();
987 Value array = apop();
988 Value length = NULL;
989 if (CSEArrayLength ||
990 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
991 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) {
992 length = append(new ArrayLength(array, state_before));
993 }
994
995 if (array->is_loaded_flattened_array()) {
996 ciType* array_type = array->declared_type();
997 ciValueKlass* elem_klass = array_type->as_value_array_klass()->element_klass()->as_value_klass();
998 NewValueTypeInstance* new_instance = new NewValueTypeInstance(elem_klass, state_before, false);
999 _memory->new_instance(new_instance);
1000 apush(append_split(new_instance));
1001 LoadIndexed* load_indexed = new LoadIndexed(array, index, length, type, state_before);
1002 load_indexed->set_vt(new_instance);
1003 append(load_indexed);
1004 } else {
1005 push(as_ValueType(type), append(new LoadIndexed(array, index, length, type, state_before)));
1006 }
1007 }
1008
1009
1010 void GraphBuilder::store_indexed(BasicType type) {
1011 // In case of in block code motion in range check elimination
1012 ValueStack* state_before = copy_state_indexed_access();
1013 compilation()->set_has_access_indexed(true);
1014 Value value = pop(as_ValueType(type));
1015 Value index = ipop();
1016 Value array = apop();
1017 Value length = NULL;
1018 if (CSEArrayLength ||
1019 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
1020 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) {
1021 length = append(new ArrayLength(array, state_before));
1022 }
1023 ciType* array_type = array->declared_type();
1024 bool check_boolean = false;
1025 if (array_type != NULL) {
1026 if (array_type->is_loaded() &&
1027 array_type->as_array_klass()->element_type()->basic_type() == T_BOOLEAN) {
1028 assert(type == T_BYTE, "boolean store uses bastore");
1029 Value mask = append(new Constant(new IntConstant(1)));
1030 value = append(new LogicOp(Bytecodes::_iand, value, mask));
1031 }
1032 } else if (type == T_BYTE) {
1033 check_boolean = true;
1034 }
1035
1036 StoreIndexed* result = new StoreIndexed(array, index, length, type, value, state_before, check_boolean);
1037 append(result);
1038 _memory->store_value(value);
1039
1040 if (type == T_OBJECT && is_profiling()) {
1041 // Note that we'd collect profile data in this method if we wanted it.
1042 compilation()->set_would_profile(true);
1043
1044 if (profile_checkcasts()) {
1045 result->set_profiled_method(method());
1046 result->set_profiled_bci(bci());
1047 result->set_should_profile(true);
1048 }
1049 }
1050 }
1051
1052
1053 void GraphBuilder::stack_op(Bytecodes::Code code) {
1054 switch (code) {
1055 case Bytecodes::_pop:
1056 { state()->raw_pop();
1057 }
1058 break;
1059 case Bytecodes::_pop2:
1060 { state()->raw_pop();
1061 state()->raw_pop();
1062 }
1063 break;
1064 case Bytecodes::_dup:
1065 { Value w = state()->raw_pop();
1066 state()->raw_push(w);
1067 state()->raw_push(w);
1068 }
1069 break;
1070 case Bytecodes::_dup_x1:
1071 { Value w1 = state()->raw_pop();
1072 Value w2 = state()->raw_pop();
1073 state()->raw_push(w1);
1074 state()->raw_push(w2);
1075 state()->raw_push(w1);
1076 }
1077 break;
1078 case Bytecodes::_dup_x2:
1079 { Value w1 = state()->raw_pop();
1080 Value w2 = state()->raw_pop();
1081 Value w3 = state()->raw_pop();
1082 state()->raw_push(w1);
1083 state()->raw_push(w3);
1084 state()->raw_push(w2);
1085 state()->raw_push(w1);
1086 }
1087 break;
1088 case Bytecodes::_dup2:
1089 { Value w1 = state()->raw_pop();
1090 Value w2 = state()->raw_pop();
1091 state()->raw_push(w2);
1092 state()->raw_push(w1);
1093 state()->raw_push(w2);
1094 state()->raw_push(w1);
1095 }
1096 break;
1097 case Bytecodes::_dup2_x1:
1098 { Value w1 = state()->raw_pop();
1099 Value w2 = state()->raw_pop();
1100 Value w3 = state()->raw_pop();
1101 state()->raw_push(w2);
1102 state()->raw_push(w1);
1103 state()->raw_push(w3);
1104 state()->raw_push(w2);
1105 state()->raw_push(w1);
1106 }
1107 break;
1108 case Bytecodes::_dup2_x2:
1109 { Value w1 = state()->raw_pop();
1110 Value w2 = state()->raw_pop();
1111 Value w3 = state()->raw_pop();
1112 Value w4 = state()->raw_pop();
1113 state()->raw_push(w2);
1114 state()->raw_push(w1);
1115 state()->raw_push(w4);
1116 state()->raw_push(w3);
1117 state()->raw_push(w2);
1118 state()->raw_push(w1);
1119 }
1120 break;
1121 case Bytecodes::_swap:
1122 { Value w1 = state()->raw_pop();
1123 Value w2 = state()->raw_pop();
1124 state()->raw_push(w1);
1125 state()->raw_push(w2);
1126 }
1127 break;
1128 default:
1129 ShouldNotReachHere();
1130 break;
1131 }
1132 }
1133
1134
1135 void GraphBuilder::arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* state_before) {
1136 Value y = pop(type);
1137 Value x = pop(type);
1138 // NOTE: strictfp can be queried from current method since we don't
1139 // inline methods with differing strictfp bits
1140 Value res = new ArithmeticOp(code, x, y, method()->is_strict(), state_before);
1141 // Note: currently single-precision floating-point rounding on Intel is handled at the LIRGenerator level
1142 res = append(res);
1143 if (method()->is_strict()) {
1144 res = round_fp(res);
1145 }
1146 push(type, res);
1147 }
1148
1149
1150 void GraphBuilder::negate_op(ValueType* type) {
1151 push(type, append(new NegateOp(pop(type))));
1152 }
1153
1154
1155 void GraphBuilder::shift_op(ValueType* type, Bytecodes::Code code) {
1156 Value s = ipop();
1157 Value x = pop(type);
1158 // try to simplify
1159 // Note: This code should go into the canonicalizer as soon as it can
1160 // can handle canonicalized forms that contain more than one node.
1161 if (CanonicalizeNodes && code == Bytecodes::_iushr) {
1162 // pattern: x >>> s
1163 IntConstant* s1 = s->type()->as_IntConstant();
1164 if (s1 != NULL) {
1165 // pattern: x >>> s1, with s1 constant
1166 ShiftOp* l = x->as_ShiftOp();
1167 if (l != NULL && l->op() == Bytecodes::_ishl) {
1168 // pattern: (a << b) >>> s1
1169 IntConstant* s0 = l->y()->type()->as_IntConstant();
1170 if (s0 != NULL) {
1171 // pattern: (a << s0) >>> s1
1172 const int s0c = s0->value() & 0x1F; // only the low 5 bits are significant for shifts
1173 const int s1c = s1->value() & 0x1F; // only the low 5 bits are significant for shifts
1174 if (s0c == s1c) {
1175 if (s0c == 0) {
1176 // pattern: (a << 0) >>> 0 => simplify to: a
1177 ipush(l->x());
1178 } else {
1179 // pattern: (a << s0c) >>> s0c => simplify to: a & m, with m constant
1180 assert(0 < s0c && s0c < BitsPerInt, "adjust code below to handle corner cases");
1181 const int m = (1 << (BitsPerInt - s0c)) - 1;
1182 Value s = append(new Constant(new IntConstant(m)));
1183 ipush(append(new LogicOp(Bytecodes::_iand, l->x(), s)));
1184 }
1185 return;
1186 }
1187 }
1188 }
1189 }
1190 }
1191 // could not simplify
1192 push(type, append(new ShiftOp(code, x, s)));
1193 }
1194
1195
1196 void GraphBuilder::logic_op(ValueType* type, Bytecodes::Code code) {
1197 Value y = pop(type);
1198 Value x = pop(type);
1199 push(type, append(new LogicOp(code, x, y)));
1200 }
1201
1202
1203 void GraphBuilder::compare_op(ValueType* type, Bytecodes::Code code) {
1204 ValueStack* state_before = copy_state_before();
1205 Value y = pop(type);
1206 Value x = pop(type);
1207 ipush(append(new CompareOp(code, x, y, state_before)));
1208 }
1209
1210
1211 void GraphBuilder::convert(Bytecodes::Code op, BasicType from, BasicType to) {
1212 push(as_ValueType(to), append(new Convert(op, pop(as_ValueType(from)), as_ValueType(to))));
1213 }
1214
1215
1216 void GraphBuilder::increment() {
1217 int index = stream()->get_index();
1218 int delta = stream()->is_wide() ? (signed short)Bytes::get_Java_u2(stream()->cur_bcp() + 4) : (signed char)(stream()->cur_bcp()[2]);
1219 load_local(intType, index);
1220 ipush(append(new Constant(new IntConstant(delta))));
1221 arithmetic_op(intType, Bytecodes::_iadd);
1222 store_local(intType, index);
1223 }
1224
1225
1226 void GraphBuilder::_goto(int from_bci, int to_bci) {
1227 Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci);
1228 if (is_profiling()) {
1229 compilation()->set_would_profile(true);
1230 x->set_profiled_bci(bci());
1231 if (profile_branches()) {
1232 x->set_profiled_method(method());
1233 x->set_should_profile(true);
1234 }
1235 }
1236 append(x);
1237 }
1238
1239
1240 void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) {
1241 BlockBegin* tsux = block_at(stream()->get_dest());
1242 BlockBegin* fsux = block_at(stream()->next_bci());
1243 bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci();
1244 // In case of loop invariant code motion or predicate insertion
1245 // before the body of a loop the state is needed
1246 Instruction *i = append(new If(x, cond, false, y, tsux, fsux, (is_bb || compilation()->is_optimistic()) ? state_before : NULL, is_bb));
1247
1248 assert(i->as_Goto() == NULL ||
1249 (i->as_Goto()->sux_at(0) == tsux && i->as_Goto()->is_safepoint() == tsux->bci() < stream()->cur_bci()) ||
1250 (i->as_Goto()->sux_at(0) == fsux && i->as_Goto()->is_safepoint() == fsux->bci() < stream()->cur_bci()),
1251 "safepoint state of Goto returned by canonicalizer incorrect");
1252
1253 if (is_profiling()) {
1254 If* if_node = i->as_If();
1255 if (if_node != NULL) {
1256 // Note that we'd collect profile data in this method if we wanted it.
1257 compilation()->set_would_profile(true);
1258 // At level 2 we need the proper bci to count backedges
1259 if_node->set_profiled_bci(bci());
1260 if (profile_branches()) {
1261 // Successors can be rotated by the canonicalizer, check for this case.
1262 if_node->set_profiled_method(method());
1263 if_node->set_should_profile(true);
1264 if (if_node->tsux() == fsux) {
1265 if_node->set_swapped(true);
1266 }
1267 }
1268 return;
1269 }
1270
1271 // Check if this If was reduced to Goto.
1272 Goto *goto_node = i->as_Goto();
1273 if (goto_node != NULL) {
1274 compilation()->set_would_profile(true);
1275 goto_node->set_profiled_bci(bci());
1276 if (profile_branches()) {
1277 goto_node->set_profiled_method(method());
1278 goto_node->set_should_profile(true);
1279 // Find out which successor is used.
1280 if (goto_node->default_sux() == tsux) {
1281 goto_node->set_direction(Goto::taken);
1282 } else if (goto_node->default_sux() == fsux) {
1283 goto_node->set_direction(Goto::not_taken);
1284 } else {
1285 ShouldNotReachHere();
1286 }
1287 }
1288 return;
1289 }
1290 }
1291 }
1292
1293
1294 void GraphBuilder::if_zero(ValueType* type, If::Condition cond) {
1295 Value y = append(new Constant(intZero));
1296 ValueStack* state_before = copy_state_before();
1297 Value x = ipop();
1298 if_node(x, cond, y, state_before);
1299 }
1300
1301
1302 void GraphBuilder::if_null(ValueType* type, If::Condition cond) {
1303 Value y = append(new Constant(objectNull));
1304 ValueStack* state_before = copy_state_before();
1305 Value x = apop();
1306 if_node(x, cond, y, state_before);
1307 }
1308
1309
1310 void GraphBuilder::if_same(ValueType* type, If::Condition cond) {
1311 ValueStack* state_before = copy_state_before();
1312 Value y = pop(type);
1313 Value x = pop(type);
1314 if_node(x, cond, y, state_before);
1315 }
1316
1317
1318 void GraphBuilder::jsr(int dest) {
1319 // We only handle well-formed jsrs (those which are "block-structured").
1320 // If the bytecodes are strange (jumping out of a jsr block) then we
1321 // might end up trying to re-parse a block containing a jsr which
1322 // has already been activated. Watch for this case and bail out.
1323 for (ScopeData* cur_scope_data = scope_data();
1324 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
1325 cur_scope_data = cur_scope_data->parent()) {
1326 if (cur_scope_data->jsr_entry_bci() == dest) {
1327 BAILOUT("too-complicated jsr/ret structure");
1328 }
1329 }
1330
1331 push(addressType, append(new Constant(new AddressConstant(next_bci()))));
1332 if (!try_inline_jsr(dest)) {
1333 return; // bailed out while parsing and inlining subroutine
1334 }
1335 }
1336
1337
1338 void GraphBuilder::ret(int local_index) {
1339 if (!parsing_jsr()) BAILOUT("ret encountered while not parsing subroutine");
1340
1341 if (local_index != scope_data()->jsr_return_address_local()) {
1342 BAILOUT("can not handle complicated jsr/ret constructs");
1343 }
1344
1345 // Rets simply become (NON-SAFEPOINT) gotos to the jsr continuation
1346 append(new Goto(scope_data()->jsr_continuation(), false));
1347 }
1348
1349
1350 void GraphBuilder::table_switch() {
1351 Bytecode_tableswitch sw(stream());
1352 const int l = sw.length();
1353 if (CanonicalizeNodes && l == 1 && compilation()->env()->comp_level() != CompLevel_full_profile) {
1354 // total of 2 successors => use If instead of switch
1355 // Note: This code should go into the canonicalizer as soon as it can
1356 // can handle canonicalized forms that contain more than one node.
1357 Value key = append(new Constant(new IntConstant(sw.low_key())));
1358 BlockBegin* tsux = block_at(bci() + sw.dest_offset_at(0));
1359 BlockBegin* fsux = block_at(bci() + sw.default_offset());
1360 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
1361 // In case of loop invariant code motion or predicate insertion
1362 // before the body of a loop the state is needed
1363 ValueStack* state_before = copy_state_if_bb(is_bb);
1364 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
1365 } else {
1366 // collect successors
1367 BlockList* sux = new BlockList(l + 1, NULL);
1368 int i;
1369 bool has_bb = false;
1370 for (i = 0; i < l; i++) {
1371 sux->at_put(i, block_at(bci() + sw.dest_offset_at(i)));
1372 if (sw.dest_offset_at(i) < 0) has_bb = true;
1373 }
1374 // add default successor
1375 if (sw.default_offset() < 0) has_bb = true;
1376 sux->at_put(i, block_at(bci() + sw.default_offset()));
1377 // In case of loop invariant code motion or predicate insertion
1378 // before the body of a loop the state is needed
1379 ValueStack* state_before = copy_state_if_bb(has_bb);
1380 Instruction* res = append(new TableSwitch(ipop(), sux, sw.low_key(), state_before, has_bb));
1381 #ifdef ASSERT
1382 if (res->as_Goto()) {
1383 for (i = 0; i < l; i++) {
1384 if (sux->at(i) == res->as_Goto()->sux_at(0)) {
1385 assert(res->as_Goto()->is_safepoint() == sw.dest_offset_at(i) < 0, "safepoint state of Goto returned by canonicalizer incorrect");
1386 }
1387 }
1388 }
1389 #endif
1390 }
1391 }
1392
1393
1394 void GraphBuilder::lookup_switch() {
1395 Bytecode_lookupswitch sw(stream());
1396 const int l = sw.number_of_pairs();
1397 if (CanonicalizeNodes && l == 1 && compilation()->env()->comp_level() != CompLevel_full_profile) {
1398 // total of 2 successors => use If instead of switch
1399 // Note: This code should go into the canonicalizer as soon as it can
1400 // can handle canonicalized forms that contain more than one node.
1401 // simplify to If
1402 LookupswitchPair pair = sw.pair_at(0);
1403 Value key = append(new Constant(new IntConstant(pair.match())));
1404 BlockBegin* tsux = block_at(bci() + pair.offset());
1405 BlockBegin* fsux = block_at(bci() + sw.default_offset());
1406 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
1407 // In case of loop invariant code motion or predicate insertion
1408 // before the body of a loop the state is needed
1409 ValueStack* state_before = copy_state_if_bb(is_bb);;
1410 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
1411 } else {
1412 // collect successors & keys
1413 BlockList* sux = new BlockList(l + 1, NULL);
1414 intArray* keys = new intArray(l, l, 0);
1415 int i;
1416 bool has_bb = false;
1417 for (i = 0; i < l; i++) {
1418 LookupswitchPair pair = sw.pair_at(i);
1419 if (pair.offset() < 0) has_bb = true;
1420 sux->at_put(i, block_at(bci() + pair.offset()));
1421 keys->at_put(i, pair.match());
1422 }
1423 // add default successor
1424 if (sw.default_offset() < 0) has_bb = true;
1425 sux->at_put(i, block_at(bci() + sw.default_offset()));
1426 // In case of loop invariant code motion or predicate insertion
1427 // before the body of a loop the state is needed
1428 ValueStack* state_before = copy_state_if_bb(has_bb);
1429 Instruction* res = append(new LookupSwitch(ipop(), sux, keys, state_before, has_bb));
1430 #ifdef ASSERT
1431 if (res->as_Goto()) {
1432 for (i = 0; i < l; i++) {
1433 if (sux->at(i) == res->as_Goto()->sux_at(0)) {
1434 assert(res->as_Goto()->is_safepoint() == sw.pair_at(i).offset() < 0, "safepoint state of Goto returned by canonicalizer incorrect");
1435 }
1436 }
1437 }
1438 #endif
1439 }
1440 }
1441
1442 void GraphBuilder::call_register_finalizer() {
1443 // If the receiver requires finalization then emit code to perform
1444 // the registration on return.
1445
1446 // Gather some type information about the receiver
1447 Value receiver = state()->local_at(0);
1448 assert(receiver != NULL, "must have a receiver");
1449 ciType* declared_type = receiver->declared_type();
1450 ciType* exact_type = receiver->exact_type();
1451 if (exact_type == NULL &&
1452 receiver->as_Local() &&
1453 receiver->as_Local()->java_index() == 0) {
1454 ciInstanceKlass* ik = compilation()->method()->holder();
1455 if (ik->is_final()) {
1456 exact_type = ik;
1457 } else if (UseCHA && !(ik->has_subklass() || ik->is_interface())) {
1458 // test class is leaf class
1459 compilation()->dependency_recorder()->assert_leaf_type(ik);
1460 exact_type = ik;
1461 } else {
1462 declared_type = ik;
1463 }
1464 }
1465
1466 // see if we know statically that registration isn't required
1467 bool needs_check = true;
1468 if (exact_type != NULL) {
1469 needs_check = exact_type->as_instance_klass()->has_finalizer();
1470 } else if (declared_type != NULL) {
1471 ciInstanceKlass* ik = declared_type->as_instance_klass();
1472 if (!Dependencies::has_finalizable_subclass(ik)) {
1473 compilation()->dependency_recorder()->assert_has_no_finalizable_subclasses(ik);
1474 needs_check = false;
1475 }
1476 }
1477
1478 if (needs_check) {
1479 // Perform the registration of finalizable objects.
1480 ValueStack* state_before = copy_state_for_exception();
1481 load_local(objectType, 0);
1482 append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init,
1483 state()->pop_arguments(1),
1484 true, state_before, true));
1485 }
1486 }
1487
1488
1489 void GraphBuilder::method_return(Value x, bool ignore_return) {
1490 if (RegisterFinalizersAtInit &&
1491 method()->intrinsic_id() == vmIntrinsics::_Object_init) {
1492 call_register_finalizer();
1493 }
1494
1495 bool need_mem_bar = false;
1496 if (method()->name() == ciSymbol::object_initializer_name() &&
1497 (scope()->wrote_final() || (AlwaysSafeConstructors && scope()->wrote_fields())
1498 || (support_IRIW_for_not_multiple_copy_atomic_cpu && scope()->wrote_volatile())
1499 )){
1500 need_mem_bar = true;
1501 }
1502
1503 BasicType bt = method()->return_type()->basic_type();
1504 switch (bt) {
1505 case T_BYTE:
1506 {
1507 Value shift = append(new Constant(new IntConstant(24)));
1508 x = append(new ShiftOp(Bytecodes::_ishl, x, shift));
1509 x = append(new ShiftOp(Bytecodes::_ishr, x, shift));
1510 break;
1511 }
1512 case T_SHORT:
1513 {
1514 Value shift = append(new Constant(new IntConstant(16)));
1515 x = append(new ShiftOp(Bytecodes::_ishl, x, shift));
1516 x = append(new ShiftOp(Bytecodes::_ishr, x, shift));
1517 break;
1518 }
1519 case T_CHAR:
1520 {
1521 Value mask = append(new Constant(new IntConstant(0xFFFF)));
1522 x = append(new LogicOp(Bytecodes::_iand, x, mask));
1523 break;
1524 }
1525 case T_BOOLEAN:
1526 {
1527 Value mask = append(new Constant(new IntConstant(1)));
1528 x = append(new LogicOp(Bytecodes::_iand, x, mask));
1529 break;
1530 }
1531 default:
1532 break;
1533 }
1534
1535 // Check to see whether we are inlining. If so, Return
1536 // instructions become Gotos to the continuation point.
1537 if (continuation() != NULL) {
1538
1539 int invoke_bci = state()->caller_state()->bci();
1540
1541 if (x != NULL && !ignore_return) {
1542 ciMethod* caller = state()->scope()->caller()->method();
1543 Bytecodes::Code invoke_raw_bc = caller->raw_code_at_bci(invoke_bci);
1544 if (invoke_raw_bc == Bytecodes::_invokehandle || invoke_raw_bc == Bytecodes::_invokedynamic) {
1545 ciType* declared_ret_type = caller->get_declared_signature_at_bci(invoke_bci)->return_type();
1546 if (declared_ret_type->is_klass() && x->exact_type() == NULL &&
1547 x->declared_type() != declared_ret_type && declared_ret_type != compilation()->env()->Object_klass()) {
1548 x = append(new TypeCast(declared_ret_type->as_klass(), x, copy_state_before()));
1549 }
1550 }
1551 }
1552
1553 assert(!method()->is_synchronized() || InlineSynchronizedMethods, "can not inline synchronized methods yet");
1554
1555 if (compilation()->env()->dtrace_method_probes()) {
1556 // Report exit from inline methods
1557 Values* args = new Values(1);
1558 args->push(append(new Constant(new MethodConstant(method()))));
1559 append(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args));
1560 }
1561
1562 // If the inlined method is synchronized, the monitor must be
1563 // released before we jump to the continuation block.
1564 if (method()->is_synchronized()) {
1565 assert(state()->locks_size() == 1, "receiver must be locked here");
1566 monitorexit(state()->lock_at(0), SynchronizationEntryBCI);
1567 }
1568
1569 if (need_mem_bar) {
1570 append(new MemBar(lir_membar_storestore));
1571 }
1572
1573 // State at end of inlined method is the state of the caller
1574 // without the method parameters on stack, including the
1575 // return value, if any, of the inlined method on operand stack.
1576 set_state(state()->caller_state()->copy_for_parsing());
1577 if (x != NULL) {
1578 if (!ignore_return) {
1579 state()->push(x->type(), x);
1580 }
1581 if (profile_return() && x->type()->is_object_kind()) {
1582 ciMethod* caller = state()->scope()->method();
1583 profile_return_type(x, method(), caller, invoke_bci);
1584 }
1585 }
1586 Goto* goto_callee = new Goto(continuation(), false);
1587
1588 // See whether this is the first return; if so, store off some
1589 // of the state for later examination
1590 if (num_returns() == 0) {
1591 set_inline_cleanup_info();
1592 }
1593
1594 // The current bci() is in the wrong scope, so use the bci() of
1595 // the continuation point.
1596 append_with_bci(goto_callee, scope_data()->continuation()->bci());
1597 incr_num_returns();
1598 return;
1599 }
1600
1601 state()->truncate_stack(0);
1602 if (method()->is_synchronized()) {
1603 // perform the unlocking before exiting the method
1604 Value receiver;
1605 if (!method()->is_static()) {
1606 receiver = _initial_state->local_at(0);
1607 } else {
1608 receiver = append(new Constant(new ClassConstant(method()->holder())));
1609 }
1610 append_split(new MonitorExit(receiver, state()->unlock()));
1611 }
1612
1613 if (need_mem_bar) {
1614 append(new MemBar(lir_membar_storestore));
1615 }
1616
1617 assert(!ignore_return, "Ignoring return value works only for inlining");
1618 append(new Return(x));
1619 }
1620
1621 Value GraphBuilder::make_constant(ciConstant field_value, ciField* field) {
1622 if (!field_value.is_valid()) return NULL;
1623
1624 BasicType field_type = field_value.basic_type();
1625 ValueType* value = as_ValueType(field_value);
1626
1627 // Attach dimension info to stable arrays.
1628 if (FoldStableValues &&
1629 field->is_stable() && field_type == T_ARRAY && !field_value.is_null_or_zero()) {
1630 ciArray* array = field_value.as_object()->as_array();
1631 jint dimension = field->type()->as_array_klass()->dimension();
1632 value = new StableArrayConstant(array, dimension);
1633 }
1634
1635 switch (field_type) {
1636 case T_ARRAY:
1637 case T_OBJECT:
1638 if (field_value.as_object()->should_be_constant()) {
1639 return new Constant(value);
1640 }
1641 return NULL; // Not a constant.
1642 default:
1643 return new Constant(value);
1644 }
1645 }
1646
1647 void GraphBuilder::copy_value_content(ciValueKlass* vk, Value src, int src_off, Value dest, int dest_off,
1648 ValueStack* state_before, bool needs_patching) {
1649 for (int i = 0; i < vk->nof_nonstatic_fields(); i++) {
1650 ciField* inner_field = vk->nonstatic_field_at(i);
1651 assert(!inner_field->is_flattened(), "the iteration over nested fields is handled by the loop itself");
1652 int off = inner_field->offset() - vk->first_field_offset();
1653 LoadField* load = new LoadField(src, src_off + off, inner_field, false, state_before, needs_patching);
1654 Value replacement = append(load);
1655 StoreField* store = new StoreField(dest, dest_off + off, inner_field, replacement, false, state_before, needs_patching);
1656 append(store);
1657 }
1658 }
1659
1660 void GraphBuilder::access_field(Bytecodes::Code code) {
1661 bool will_link;
1662 ciField* field = stream()->get_field(will_link);
1663 ciInstanceKlass* holder = field->holder();
1664 BasicType field_type = field->type()->basic_type();
1665 ValueType* type = as_ValueType(field_type);
1666
1667 // call will_link again to determine if the field is valid.
1668 const bool needs_patching = !holder->is_loaded() ||
1669 !field->will_link(method(), code) ||
1670 PatchALot;
1671
1672 ValueStack* state_before = NULL;
1673 if (!holder->is_initialized() || needs_patching) {
1674 // save state before instruction for debug info when
1675 // deoptimization happens during patching
1676 state_before = copy_state_before();
1677 }
1678
1679 Value obj = NULL;
1680 if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) {
1681 if (state_before != NULL) {
1682 // build a patching constant
1683 obj = new Constant(new InstanceConstant(holder->java_mirror()), state_before);
1684 } else {
1685 obj = new Constant(new InstanceConstant(holder->java_mirror()));
1686 }
1687 }
1688
1689 if (field->is_final() && (code == Bytecodes::_putfield)) {
1690 scope()->set_wrote_final();
1691 }
1692
1693 if (code == Bytecodes::_putfield) {
1694 scope()->set_wrote_fields();
1695 if (field->is_volatile()) {
1696 scope()->set_wrote_volatile();
1697 }
1698 }
1699
1700 const int offset = !needs_patching ? field->offset() : -1;
1701 switch (code) {
1702 case Bytecodes::_getstatic: {
1703 // check for compile-time constants, i.e., initialized static final fields
1704 Value constant = NULL;
1705 if (field->is_static_constant() && !PatchALot) {
1706 ciConstant field_value = field->constant_value();
1707 assert(!field->is_stable() || !field_value.is_null_or_zero(),
1708 "stable static w/ default value shouldn't be a constant");
1709 constant = make_constant(field_value, field);
1710 }
1711 if (constant != NULL) {
1712 push(type, append(constant));
1713 } else {
1714 if (state_before == NULL) {
1715 state_before = copy_state_for_exception();
1716 }
1717 LoadField* load_field = new LoadField(append(obj), offset, field, true,
1718 state_before, needs_patching);
1719 if (field->is_q_type()) {
1720 load_field->set_never_null(true);
1721 }
1722 push(type, append(load_field));
1723 }
1724 break;
1725 }
1726 case Bytecodes::_putstatic: {
1727 Value val = pop(type);
1728 if (state_before == NULL) {
1729 state_before = copy_state_for_exception();
1730 }
1731 if (field->type()->basic_type() == T_BOOLEAN) {
1732 Value mask = append(new Constant(new IntConstant(1)));
1733 val = append(new LogicOp(Bytecodes::_iand, val, mask));
1734 }
1735 append(new StoreField(append(obj), offset, field, val, true, state_before, needs_patching));
1736 break;
1737 }
1738 case Bytecodes::_getfield: {
1739 // Check for compile-time constants, i.e., trusted final non-static fields.
1740 Value constant = NULL;
1741 obj = apop();
1742 ObjectType* obj_type = obj->type()->as_ObjectType();
1743 if (field->is_constant() && !field->is_flattened() && obj_type->is_constant() && !PatchALot) {
1744 ciObject* const_oop = obj_type->constant_value();
1745 if (!const_oop->is_null_object() && const_oop->is_loaded()) {
1746 ciConstant field_value = field->constant_value_of(const_oop);
1747 if (field_value.is_valid()) {
1748 constant = make_constant(field_value, field);
1749 // For CallSite objects add a dependency for invalidation of the optimization.
1750 if (field->is_call_site_target()) {
1751 ciCallSite* call_site = const_oop->as_call_site();
1752 if (!call_site->is_constant_call_site()) {
1753 ciMethodHandle* target = field_value.as_object()->as_method_handle();
1754 dependency_recorder()->assert_call_site_target_value(call_site, target);
1755 }
1756 }
1757 }
1758 }
1759 }
1760 if (constant != NULL) {
1761 push(type, append(constant));
1762 } else {
1763 if (state_before == NULL) {
1764 state_before = copy_state_for_exception();
1765 }
1766
1767 if (!field->is_flattened()) {
1768 LoadField* load = new LoadField(obj, offset, field, false, state_before, needs_patching);
1769 Value replacement = !needs_patching ? _memory->load(load) : load;
1770 if (replacement != load) {
1771 assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked");
1772 push(type, replacement);
1773 } else {
1774 push(type, append(load));
1775 }
1776 } else { // flattened field, not optimized solution: re-instantiate the flattened value
1777 assert(field->type()->is_valuetype(), "Sanity check");
1778 ciValueKlass* value_klass = field->type()->as_value_klass();
1779 int flattening_offset = field->offset() - value_klass->first_field_offset();
1780 assert(field->type()->is_valuetype(), "Sanity check");
1781 scope()->set_wrote_final();
1782 scope()->set_wrote_fields();
1783 NewValueTypeInstance* new_instance = new NewValueTypeInstance(value_klass, state_before, false);
1784 _memory->new_instance(new_instance);
1785 apush(append_split(new_instance));
1786 copy_value_content(value_klass, obj, field->offset() , new_instance, value_klass->first_field_offset(),
1787 state_before, needs_patching);
1788 }
1789 }
1790 break;
1791 }
1792 case Bytecodes::_putfield: {
1793 Value val = pop(type);
1794 obj = apop();
1795 if (state_before == NULL) {
1796 state_before = copy_state_for_exception();
1797 }
1798 if (field->type()->basic_type() == T_BOOLEAN) {
1799 Value mask = append(new Constant(new IntConstant(1)));
1800 val = append(new LogicOp(Bytecodes::_iand, val, mask));
1801 }
1802
1803 if (!field->is_flattened()) {
1804 StoreField* store = new StoreField(obj, offset, field, val, false, state_before, needs_patching);
1805 if (!needs_patching) store = _memory->store(store);
1806 if (store != NULL) {
1807 append(store);
1808 }
1809 } else {
1810 assert(field->type()->is_valuetype(), "Sanity check");
1811 ciValueKlass* value_klass = field->type()->as_value_klass();
1812 int flattening_offset = field->offset() - value_klass->first_field_offset();
1813 copy_value_content(value_klass, val, value_klass->first_field_offset(), obj, field->offset(),
1814 state_before, needs_patching);
1815 }
1816 break;
1817 }
1818 default:
1819 ShouldNotReachHere();
1820 break;
1821 }
1822 }
1823
1824 // Baseline version of withfield, allocate every time
1825 void GraphBuilder::withfield(int field_index)
1826 {
1827 bool will_link;
1828 ciField* field_modify = stream()->get_field(will_link);
1829 ciInstanceKlass* holder = field_modify->holder();
1830 assert(holder->is_valuetype(), "must be a value klass");
1831 BasicType field_type = field_modify->type()->basic_type();
1832 ValueType* type = as_ValueType(field_type);
1833
1834 // call will_link again to determine if the field is valid.
1835 const bool needs_patching = !holder->is_loaded() ||
1836 !field_modify->will_link(method(), Bytecodes::_withfield) ||
1837 PatchALot;
1838
1839
1840 scope()->set_wrote_final();
1841 scope()->set_wrote_fields();
1842
1843 const int offset = !needs_patching ? field_modify->offset() : -1;
1844 Value val = pop(type);
1845 Value obj = apop();
1846
1847 ValueStack* state_before = copy_state_for_exception();
1848
1849 NewValueTypeInstance* new_instance = new NewValueTypeInstance(holder->as_value_klass(), state_before, false);
1850 _memory->new_instance(new_instance);
1851 apush(append_split(new_instance));
1852
1853 for (int i = 0; i < holder->nof_nonstatic_fields(); i++) {
1854 ciField* field = holder->nonstatic_field_at(i);
1855 int off = field->offset();
1856
1857 if (field->offset() != offset) {
1858 if (field->is_flattened()) {
1859 assert(field->type()->is_valuetype(), "Sanity check");
1860 assert(field->type()->is_valuetype(), "Only value types can be flattened");
1861 ciValueKlass* vk = field->type()->as_value_klass();
1862 copy_value_content(vk, obj, off, new_instance, vk->first_field_offset(), state_before, needs_patching);
1863 } else {
1864 // Only load those fields who are not modified
1865 LoadField* load = new LoadField(obj, off, field, false, state_before, needs_patching);
1866 Value replacement = append(load);
1867 StoreField* store = new StoreField(new_instance, off, field, replacement, false, state_before, needs_patching);
1868 append(store);
1869 }
1870 }
1871 }
1872
1873 // Field to modify
1874 if (field_modify->type()->basic_type() == T_BOOLEAN) {
1875 Value mask = append(new Constant(new IntConstant(1)));
1876 val = append(new LogicOp(Bytecodes::_iand, val, mask));
1877 }
1878 if (field_modify->is_flattened()) {
1879 assert(field_modify->type()->is_valuetype(), "Only value types can be flattened");
1880 ciValueKlass* vk = field_modify->type()->as_value_klass();
1881 copy_value_content(vk, val, vk->first_field_offset(), new_instance, field_modify->offset(), state_before, needs_patching);
1882 } else {
1883 StoreField* store = new StoreField(new_instance, offset, field_modify, val, false, state_before, needs_patching);
1884 append(store);
1885 }
1886 }
1887
1888 Dependencies* GraphBuilder::dependency_recorder() const {
1889 assert(DeoptC1, "need debug information");
1890 return compilation()->dependency_recorder();
1891 }
1892
1893 // How many arguments do we want to profile?
1894 Values* GraphBuilder::args_list_for_profiling(ciMethod* target, int& start, bool may_have_receiver) {
1895 int n = 0;
1896 bool has_receiver = may_have_receiver && Bytecodes::has_receiver(method()->java_code_at_bci(bci()));
1897 start = has_receiver ? 1 : 0;
1898 if (profile_arguments()) {
1899 ciProfileData* data = method()->method_data()->bci_to_data(bci());
1900 if (data != NULL && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) {
1901 n = data->is_CallTypeData() ? data->as_CallTypeData()->number_of_arguments() : data->as_VirtualCallTypeData()->number_of_arguments();
1902 }
1903 }
1904 // If we are inlining then we need to collect arguments to profile parameters for the target
1905 if (profile_parameters() && target != NULL) {
1906 if (target->method_data() != NULL && target->method_data()->parameters_type_data() != NULL) {
1907 // The receiver is profiled on method entry so it's included in
1908 // the number of parameters but here we're only interested in
1909 // actual arguments.
1910 n = MAX2(n, target->method_data()->parameters_type_data()->number_of_parameters() - start);
1911 }
1912 }
1913 if (n > 0) {
1914 return new Values(n);
1915 }
1916 return NULL;
1917 }
1918
1919 void GraphBuilder::check_args_for_profiling(Values* obj_args, int expected) {
1920 #ifdef ASSERT
1921 bool ignored_will_link;
1922 ciSignature* declared_signature = NULL;
1923 ciMethod* real_target = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature);
1924 assert(expected == obj_args->max_length() || real_target->is_method_handle_intrinsic(), "missed on arg?");
1925 #endif
1926 }
1927
1928 // Collect arguments that we want to profile in a list
1929 Values* GraphBuilder::collect_args_for_profiling(Values* args, ciMethod* target, bool may_have_receiver) {
1930 int start = 0;
1931 Values* obj_args = args_list_for_profiling(target, start, may_have_receiver);
1932 if (obj_args == NULL) {
1933 return NULL;
1934 }
1935 int s = obj_args->max_length();
1936 // if called through method handle invoke, some arguments may have been popped
1937 for (int i = start, j = 0; j < s && i < args->length(); i++) {
1938 if (args->at(i)->type()->is_object_kind()) {
1939 obj_args->push(args->at(i));
1940 j++;
1941 }
1942 }
1943 check_args_for_profiling(obj_args, s);
1944 return obj_args;
1945 }
1946
1947
1948 void GraphBuilder::invoke(Bytecodes::Code code) {
1949 bool will_link;
1950 ciSignature* declared_signature = NULL;
1951 ciMethod* target = stream()->get_method(will_link, &declared_signature);
1952 ciKlass* holder = stream()->get_declared_method_holder();
1953 const Bytecodes::Code bc_raw = stream()->cur_bc_raw();
1954 assert(declared_signature != NULL, "cannot be null");
1955 assert(will_link == target->is_loaded(), "");
1956
1957 ciInstanceKlass* klass = target->holder();
1958 assert(!target->is_loaded() || klass->is_loaded(), "loaded target must imply loaded klass");
1959
1960 // check if CHA possible: if so, change the code to invoke_special
1961 ciInstanceKlass* calling_klass = method()->holder();
1962 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder);
1963 ciInstanceKlass* actual_recv = callee_holder;
1964
1965 CompileLog* log = compilation()->log();
1966 if (log != NULL)
1967 log->elem("call method='%d' instr='%s'",
1968 log->identify(target),
1969 Bytecodes::name(code));
1970
1971 // invoke-special-super
1972 if (bc_raw == Bytecodes::_invokespecial && !target->is_object_initializer()) {
1973 ciInstanceKlass* sender_klass =
1974 calling_klass->is_unsafe_anonymous() ? calling_klass->unsafe_anonymous_host() :
1975 calling_klass;
1976 if (sender_klass->is_interface()) {
1977 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
1978 Value receiver = state()->stack_at(index);
1979 CheckCast* c = new CheckCast(sender_klass, receiver, copy_state_before());
1980 c->set_invokespecial_receiver_check();
1981 state()->stack_at_put(index, append_split(c));
1982 }
1983 }
1984
1985 // Some methods are obviously bindable without any type checks so
1986 // convert them directly to an invokespecial or invokestatic.
1987 if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) {
1988 switch (bc_raw) {
1989 case Bytecodes::_invokevirtual:
1990 code = Bytecodes::_invokespecial;
1991 break;
1992 case Bytecodes::_invokehandle:
1993 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial;
1994 break;
1995 default:
1996 break;
1997 }
1998 } else {
1999 if (bc_raw == Bytecodes::_invokehandle) {
2000 assert(!will_link, "should come here only for unlinked call");
2001 code = Bytecodes::_invokespecial;
2002 }
2003 }
2004
2005 // Push appendix argument (MethodType, CallSite, etc.), if one.
2006 bool patch_for_appendix = false;
2007 int patching_appendix_arg = 0;
2008 if (Bytecodes::has_optional_appendix(bc_raw) && (!will_link || PatchALot)) {
2009 Value arg = append(new Constant(new ObjectConstant(compilation()->env()->unloaded_ciinstance()), copy_state_before()));
2010 apush(arg);
2011 patch_for_appendix = true;
2012 patching_appendix_arg = (will_link && stream()->has_appendix()) ? 0 : 1;
2013 } else if (stream()->has_appendix()) {
2014 ciObject* appendix = stream()->get_appendix();
2015 Value arg = append(new Constant(new ObjectConstant(appendix)));
2016 apush(arg);
2017 }
2018
2019 ciMethod* cha_monomorphic_target = NULL;
2020 ciMethod* exact_target = NULL;
2021 Value better_receiver = NULL;
2022 if (UseCHA && DeoptC1 && target->is_loaded() &&
2023 !(// %%% FIXME: Are both of these relevant?
2024 target->is_method_handle_intrinsic() ||
2025 target->is_compiled_lambda_form()) &&
2026 !patch_for_appendix) {
2027 Value receiver = NULL;
2028 ciInstanceKlass* receiver_klass = NULL;
2029 bool type_is_exact = false;
2030 // try to find a precise receiver type
2031 if (will_link && !target->is_static()) {
2032 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
2033 receiver = state()->stack_at(index);
2034 ciType* type = receiver->exact_type();
2035 if (type != NULL && type->is_loaded() &&
2036 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
2037 receiver_klass = (ciInstanceKlass*) type;
2038 type_is_exact = true;
2039 }
2040 if (type == NULL) {
2041 type = receiver->declared_type();
2042 if (type != NULL && type->is_loaded() &&
2043 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
2044 receiver_klass = (ciInstanceKlass*) type;
2045 if (receiver_klass->is_leaf_type() && !receiver_klass->is_final()) {
2046 // Insert a dependency on this type since
2047 // find_monomorphic_target may assume it's already done.
2048 dependency_recorder()->assert_leaf_type(receiver_klass);
2049 type_is_exact = true;
2050 }
2051 }
2052 }
2053 }
2054 if (receiver_klass != NULL && type_is_exact &&
2055 receiver_klass->is_loaded() && code != Bytecodes::_invokespecial) {
2056 // If we have the exact receiver type we can bind directly to
2057 // the method to call.
2058 exact_target = target->resolve_invoke(calling_klass, receiver_klass);
2059 if (exact_target != NULL) {
2060 target = exact_target;
2061 code = Bytecodes::_invokespecial;
2062 }
2063 }
2064 if (receiver_klass != NULL &&
2065 receiver_klass->is_subtype_of(actual_recv) &&
2066 actual_recv->is_initialized()) {
2067 actual_recv = receiver_klass;
2068 }
2069
2070 if ((code == Bytecodes::_invokevirtual && callee_holder->is_initialized()) ||
2071 (code == Bytecodes::_invokeinterface && callee_holder->is_initialized() && !actual_recv->is_interface())) {
2072 // Use CHA on the receiver to select a more precise method.
2073 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv);
2074 } else if (code == Bytecodes::_invokeinterface && callee_holder->is_loaded() && receiver != NULL) {
2075 assert(callee_holder->is_interface(), "invokeinterface to non interface?");
2076 // If there is only one implementor of this interface then we
2077 // may be able bind this invoke directly to the implementing
2078 // klass but we need both a dependence on the single interface
2079 // and on the method we bind to. Additionally since all we know
2080 // about the receiver type is the it's supposed to implement the
2081 // interface we have to insert a check that it's the class we
2082 // expect. Interface types are not checked by the verifier so
2083 // they are roughly equivalent to Object.
2084 // The number of implementors for declared_interface is less or
2085 // equal to the number of implementors for target->holder() so
2086 // if number of implementors of target->holder() == 1 then
2087 // number of implementors for decl_interface is 0 or 1. If
2088 // it's 0 then no class implements decl_interface and there's
2089 // no point in inlining.
2090 ciInstanceKlass* singleton = NULL;
2091 ciInstanceKlass* declared_interface = callee_holder;
2092 if (declared_interface->nof_implementors() == 1 &&
2093 (!target->is_default_method() || target->is_overpass()) /* CHA doesn't support default methods yet. */) {
2094 singleton = declared_interface->implementor();
2095 assert(singleton != NULL && singleton != declared_interface, "");
2096 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, declared_interface, singleton);
2097 if (cha_monomorphic_target != NULL) {
2098 if (cha_monomorphic_target->holder() != compilation()->env()->Object_klass()) {
2099 // If CHA is able to bind this invoke then update the class
2100 // to match that class, otherwise klass will refer to the
2101 // interface.
2102 klass = cha_monomorphic_target->holder();
2103 actual_recv = declared_interface;
2104
2105 // insert a check it's really the expected class.
2106 CheckCast* c = new CheckCast(klass, receiver, copy_state_for_exception());
2107 c->set_incompatible_class_change_check();
2108 c->set_direct_compare(klass->is_final());
2109 // pass the result of the checkcast so that the compiler has
2110 // more accurate type info in the inlinee
2111 better_receiver = append_split(c);
2112 } else {
2113 cha_monomorphic_target = NULL; // subtype check against Object is useless
2114 }
2115 }
2116 }
2117 }
2118 }
2119
2120 if (cha_monomorphic_target != NULL) {
2121 assert(!cha_monomorphic_target->is_abstract(), "");
2122 if (!target->is_final_method() && !target->is_private()) {
2123 // If we inlined because CHA revealed only a single target method,
2124 // then we are dependent on that target method not getting overridden
2125 // by dynamic class loading. Be sure to test the "static" receiver
2126 // dest_method here, as opposed to the actual receiver, which may
2127 // falsely lead us to believe that the receiver is final or private.
2128 dependency_recorder()->assert_unique_concrete_method(actual_recv, cha_monomorphic_target);
2129 }
2130 code = Bytecodes::_invokespecial;
2131 }
2132
2133 // check if we could do inlining
2134 if (!PatchALot && Inline && target->is_loaded() &&
2135 (klass->is_initialized() || (klass->is_interface() && target->holder()->is_initialized()))
2136 && !patch_for_appendix) {
2137 // callee is known => check if we have static binding
2138 if (code == Bytecodes::_invokestatic ||
2139 code == Bytecodes::_invokespecial ||
2140 (code == Bytecodes::_invokevirtual && target->is_final_method()) ||
2141 code == Bytecodes::_invokedynamic) {
2142 ciMethod* inline_target = (cha_monomorphic_target != NULL) ? cha_monomorphic_target : target;
2143 // static binding => check if callee is ok
2144 bool success = try_inline(inline_target, (cha_monomorphic_target != NULL) || (exact_target != NULL), false, code, better_receiver);
2145
2146 CHECK_BAILOUT();
2147 clear_inline_bailout();
2148
2149 if (success) {
2150 // Register dependence if JVMTI has either breakpoint
2151 // setting or hotswapping of methods capabilities since they may
2152 // cause deoptimization.
2153 if (compilation()->env()->jvmti_can_hotswap_or_post_breakpoint()) {
2154 dependency_recorder()->assert_evol_method(inline_target);
2155 }
2156 return;
2157 }
2158 } else {
2159 print_inlining(target, "no static binding", /*success*/ false);
2160 }
2161 } else {
2162 print_inlining(target, "not inlineable", /*success*/ false);
2163 }
2164
2165 // If we attempted an inline which did not succeed because of a
2166 // bailout during construction of the callee graph, the entire
2167 // compilation has to be aborted. This is fairly rare and currently
2168 // seems to only occur for jasm-generated classes which contain
2169 // jsr/ret pairs which are not associated with finally clauses and
2170 // do not have exception handlers in the containing method, and are
2171 // therefore not caught early enough to abort the inlining without
2172 // corrupting the graph. (We currently bail out with a non-empty
2173 // stack at a ret in these situations.)
2174 CHECK_BAILOUT();
2175
2176 // inlining not successful => standard invoke
2177 ValueType* result_type = as_ValueType(declared_signature->return_type());
2178 ValueStack* state_before = copy_state_exhandling();
2179
2180 // The bytecode (code) might change in this method so we are checking this very late.
2181 const bool has_receiver =
2182 code == Bytecodes::_invokespecial ||
2183 code == Bytecodes::_invokevirtual ||
2184 code == Bytecodes::_invokeinterface;
2185 Values* args = state()->pop_arguments(target->arg_size_no_receiver() + patching_appendix_arg);
2186 Value recv = has_receiver ? apop() : NULL;
2187 int vtable_index = Method::invalid_vtable_index;
2188
2189 #ifdef SPARC
2190 // Currently only supported on Sparc.
2191 // The UseInlineCaches only controls dispatch to invokevirtuals for
2192 // loaded classes which we weren't able to statically bind.
2193 if (!UseInlineCaches && target->is_loaded() && code == Bytecodes::_invokevirtual
2194 && !target->can_be_statically_bound()) {
2195 // Find a vtable index if one is available
2196 // For arrays, callee_holder is Object. Resolving the call with
2197 // Object would allow an illegal call to finalize() on an
2198 // array. We use holder instead: illegal calls to finalize() won't
2199 // be compiled as vtable calls (IC call resolution will catch the
2200 // illegal call) and the few legal calls on array types won't be
2201 // either.
2202 vtable_index = target->resolve_vtable_index(calling_klass, holder);
2203 }
2204 #endif
2205
2206 // A null check is required here (when there is a receiver) for any of the following cases
2207 // - invokespecial, always need a null check.
2208 // - invokevirtual, when the target is final and loaded. Calls to final targets will become optimized
2209 // and require null checking. If the target is loaded a null check is emitted here.
2210 // If the target isn't loaded the null check must happen after the call resolution. We achieve that
2211 // by using the target methods unverified entry point (see CompiledIC::compute_monomorphic_entry).
2212 // (The JVM specification requires that LinkageError must be thrown before a NPE. An unloaded target may
2213 // potentially fail, and can't have the null check before the resolution.)
2214 // - A call that will be profiled. (But we can't add a null check when the target is unloaded, by the same
2215 // reason as above, so calls with a receiver to unloaded targets can't be profiled.)
2216 //
2217 // Normal invokevirtual will perform the null check during lookup
2218
2219 bool need_null_check = (code == Bytecodes::_invokespecial) ||
2220 (target->is_loaded() && (target->is_final_method() || (is_profiling() && profile_calls())));
2221
2222 if (need_null_check) {
2223 if (recv != NULL) {
2224 null_check(recv);
2225 }
2226
2227 if (is_profiling()) {
2228 // Note that we'd collect profile data in this method if we wanted it.
2229 compilation()->set_would_profile(true);
2230
2231 if (profile_calls()) {
2232 assert(cha_monomorphic_target == NULL || exact_target == NULL, "both can not be set");
2233 ciKlass* target_klass = NULL;
2234 if (cha_monomorphic_target != NULL) {
2235 target_klass = cha_monomorphic_target->holder();
2236 } else if (exact_target != NULL) {
2237 target_klass = exact_target->holder();
2238 }
2239 profile_call(target, recv, target_klass, collect_args_for_profiling(args, NULL, false), false);
2240 }
2241 }
2242 }
2243
2244 Invoke* result = new Invoke(code, result_type, recv, args, vtable_index, target, state_before,
2245 declared_signature->returns_never_null());
2246 // push result
2247 append_split(result);
2248
2249 if (result_type != voidType) {
2250 if (method()->is_strict()) {
2251 push(result_type, round_fp(result));
2252 } else {
2253 push(result_type, result);
2254 }
2255 }
2256 if (profile_return() && result_type->is_object_kind()) {
2257 profile_return_type(result, target);
2258 }
2259 }
2260
2261
2262 void GraphBuilder::new_instance(int klass_index) {
2263 ValueStack* state_before = copy_state_exhandling();
2264 bool will_link;
2265 ciKlass* klass = stream()->get_klass(will_link);
2266 assert(klass->is_instance_klass(), "must be an instance klass");
2267 assert(!klass->is_valuetype(), "must not be a value klass");
2268 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before, stream()->is_unresolved_klass());
2269 _memory->new_instance(new_instance);
2270 apush(append_split(new_instance));
2271 }
2272
2273 void GraphBuilder::new_value_type_instance(int klass_index) {
2274 ValueStack* state_before = copy_state_exhandling();
2275 bool will_link;
2276 ciKlass* klass = stream()->get_klass(will_link);
2277 assert(klass->is_valuetype(), "must be a value klass");
2278 NewValueTypeInstance* new_instance = new NewValueTypeInstance(klass->as_value_klass(),
2279 state_before, stream()->is_unresolved_klass());
2280 _memory->new_instance(new_instance);
2281 apush(append_split(new_instance));
2282 }
2283
2284 void GraphBuilder::new_type_array() {
2285 ValueStack* state_before = copy_state_exhandling();
2286 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before)));
2287 }
2288
2289
2290 void GraphBuilder::new_object_array() {
2291 bool will_link;
2292 ciKlass* klass = stream()->get_klass(will_link);
2293 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2294 NewArray* n = new NewObjectArray(klass, ipop(), state_before);
2295 if (stream()->is_klass_never_null()) {
2296 n->set_never_null(true);
2297 }
2298 apush(append_split(n));
2299 }
2300
2301
2302 bool GraphBuilder::direct_compare(ciKlass* k) {
2303 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) {
2304 ciInstanceKlass* ik = k->as_instance_klass();
2305 if (ik->is_final()) {
2306 return true;
2307 } else {
2308 if (DeoptC1 && UseCHA && !(ik->has_subklass() || ik->is_interface())) {
2309 // test class is leaf class
2310 dependency_recorder()->assert_leaf_type(ik);
2311 return true;
2312 }
2313 }
2314 }
2315 return false;
2316 }
2317
2318
2319 void GraphBuilder::check_cast(int klass_index) {
2320 bool will_link;
2321 ciKlass* klass = stream()->get_klass(will_link);
2322 bool never_null = stream()->is_klass_never_null();
2323 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_for_exception();
2324 CheckCast* c = new CheckCast(klass, apop(), state_before, never_null);
2325 apush(append_split(c));
2326 c->set_direct_compare(direct_compare(klass));
2327
2328 if (is_profiling()) {
2329 // Note that we'd collect profile data in this method if we wanted it.
2330 compilation()->set_would_profile(true);
2331
2332 if (profile_checkcasts()) {
2333 c->set_profiled_method(method());
2334 c->set_profiled_bci(bci());
2335 c->set_should_profile(true);
2336 }
2337 }
2338 }
2339
2340
2341 void GraphBuilder::instance_of(int klass_index) {
2342 bool will_link;
2343 ciKlass* klass = stream()->get_klass(will_link);
2344 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2345 InstanceOf* i = new InstanceOf(klass, apop(), state_before);
2346 ipush(append_split(i));
2347 i->set_direct_compare(direct_compare(klass));
2348
2349 if (is_profiling()) {
2350 // Note that we'd collect profile data in this method if we wanted it.
2351 compilation()->set_would_profile(true);
2352
2353 if (profile_checkcasts()) {
2354 i->set_profiled_method(method());
2355 i->set_profiled_bci(bci());
2356 i->set_should_profile(true);
2357 }
2358 }
2359 }
2360
2361
2362 void GraphBuilder::monitorenter(Value x, int bci) {
2363 bool maybe_valuetype = false;
2364 if (bci == InvocationEntryBci) {
2365 // Called by GraphBuilder::inline_sync_entry.
2366 #ifdef ASSERT
2367 ciType* obj_type = x->declared_type();
2368 assert(obj_type == NULL || !obj_type->is_valuetype(), "valuetypes cannot have synchronized methods");
2369 #endif
2370 } else {
2371 // We are compiling a monitorenter bytecode
2372 if (EnableValhalla) {
2373 ciType* obj_type = x->declared_type();
2374 if (obj_type == NULL || obj_type->is_valuetype() || obj_type->as_klass()->is_java_lang_Object()) {
2375 // If we're (possibly) locking on a valuetype, check for markOopDesc::always_locked_pattern
2376 // and throw IMSE. (obj_type is null for Phi nodes, so let's just be conservative).
2377 maybe_valuetype = true;
2378 }
2379 }
2380 }
2381
2382 // save state before locking in case of deoptimization after a NullPointerException
2383 ValueStack* state_before = copy_state_for_exception_with_bci(bci);
2384 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before, maybe_valuetype), bci);
2385 kill_all();
2386 }
2387
2388
2389 void GraphBuilder::monitorexit(Value x, int bci) {
2390 append_with_bci(new MonitorExit(x, state()->unlock()), bci);
2391 kill_all();
2392 }
2393
2394
2395 void GraphBuilder::new_multi_array(int dimensions) {
2396 bool will_link;
2397 ciKlass* klass = stream()->get_klass(will_link);
2398 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2399
2400 Values* dims = new Values(dimensions, dimensions, NULL);
2401 // fill in all dimensions
2402 int i = dimensions;
2403 while (i-- > 0) dims->at_put(i, ipop());
2404 // create array
2405 NewArray* n = new NewMultiArray(klass, dims, state_before);
2406 apush(append_split(n));
2407 }
2408
2409
2410 void GraphBuilder::throw_op(int bci) {
2411 // We require that the debug info for a Throw be the "state before"
2412 // the Throw (i.e., exception oop is still on TOS)
2413 ValueStack* state_before = copy_state_before_with_bci(bci);
2414 Throw* t = new Throw(apop(), state_before);
2415 // operand stack not needed after a throw
2416 state()->truncate_stack(0);
2417 append_with_bci(t, bci);
2418 }
2419
2420
2421 Value GraphBuilder::round_fp(Value fp_value) {
2422 // no rounding needed if SSE2 is used
2423 if (RoundFPResults && UseSSE < 2) {
2424 // Must currently insert rounding node for doubleword values that
2425 // are results of expressions (i.e., not loads from memory or
2426 // constants)
2427 if (fp_value->type()->tag() == doubleTag &&
2428 fp_value->as_Constant() == NULL &&
2429 fp_value->as_Local() == NULL && // method parameters need no rounding
2430 fp_value->as_RoundFP() == NULL) {
2431 return append(new RoundFP(fp_value));
2432 }
2433 }
2434 return fp_value;
2435 }
2436
2437
2438 Instruction* GraphBuilder::append_with_bci(Instruction* instr, int bci) {
2439 Canonicalizer canon(compilation(), instr, bci);
2440 Instruction* i1 = canon.canonical();
2441 if (i1->is_linked() || !i1->can_be_linked()) {
2442 // Canonicalizer returned an instruction which was already
2443 // appended so simply return it.
2444 return i1;
2445 }
2446
2447 if (UseLocalValueNumbering) {
2448 // Lookup the instruction in the ValueMap and add it to the map if
2449 // it's not found.
2450 Instruction* i2 = vmap()->find_insert(i1);
2451 if (i2 != i1) {
2452 // found an entry in the value map, so just return it.
2453 assert(i2->is_linked(), "should already be linked");
2454 return i2;
2455 }
2456 ValueNumberingEffects vne(vmap());
2457 i1->visit(&vne);
2458 }
2459
2460 // i1 was not eliminated => append it
2461 assert(i1->next() == NULL, "shouldn't already be linked");
2462 _last = _last->set_next(i1, canon.bci());
2463
2464 if (++_instruction_count >= InstructionCountCutoff && !bailed_out()) {
2465 // set the bailout state but complete normal processing. We
2466 // might do a little more work before noticing the bailout so we
2467 // want processing to continue normally until it's noticed.
2468 bailout("Method and/or inlining is too large");
2469 }
2470
2471 #ifndef PRODUCT
2472 if (PrintIRDuringConstruction) {
2473 InstructionPrinter ip;
2474 ip.print_line(i1);
2475 if (Verbose) {
2476 state()->print();
2477 }
2478 }
2479 #endif
2480
2481 // save state after modification of operand stack for StateSplit instructions
2482 StateSplit* s = i1->as_StateSplit();
2483 if (s != NULL) {
2484 if (EliminateFieldAccess) {
2485 Intrinsic* intrinsic = s->as_Intrinsic();
2486 if (s->as_Invoke() != NULL || (intrinsic && !intrinsic->preserves_state())) {
2487 _memory->kill();
2488 }
2489 }
2490 s->set_state(state()->copy(ValueStack::StateAfter, canon.bci()));
2491 }
2492
2493 // set up exception handlers for this instruction if necessary
2494 if (i1->can_trap()) {
2495 i1->set_exception_handlers(handle_exception(i1));
2496 assert(i1->exception_state() != NULL || !i1->needs_exception_state() || bailed_out(), "handle_exception must set exception state");
2497 }
2498 return i1;
2499 }
2500
2501
2502 Instruction* GraphBuilder::append(Instruction* instr) {
2503 assert(instr->as_StateSplit() == NULL || instr->as_BlockEnd() != NULL, "wrong append used");
2504 return append_with_bci(instr, bci());
2505 }
2506
2507
2508 Instruction* GraphBuilder::append_split(StateSplit* instr) {
2509 return append_with_bci(instr, bci());
2510 }
2511
2512
2513 void GraphBuilder::null_check(Value value) {
2514 if (value->as_NewArray() != NULL || value->as_NewInstance() != NULL) {
2515 return;
2516 } else {
2517 Constant* con = value->as_Constant();
2518 if (con) {
2519 ObjectType* c = con->type()->as_ObjectType();
2520 if (c && c->is_loaded()) {
2521 ObjectConstant* oc = c->as_ObjectConstant();
2522 if (!oc || !oc->value()->is_null_object()) {
2523 return;
2524 }
2525 }
2526 }
2527 }
2528 append(new NullCheck(value, copy_state_for_exception()));
2529 }
2530
2531
2532
2533 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) {
2534 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != NULL)) {
2535 assert(instruction->exception_state() == NULL
2536 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState
2537 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->should_retain_local_variables()),
2538 "exception_state should be of exception kind");
2539 return new XHandlers();
2540 }
2541
2542 XHandlers* exception_handlers = new XHandlers();
2543 ScopeData* cur_scope_data = scope_data();
2544 ValueStack* cur_state = instruction->state_before();
2545 ValueStack* prev_state = NULL;
2546 int scope_count = 0;
2547
2548 assert(cur_state != NULL, "state_before must be set");
2549 do {
2550 int cur_bci = cur_state->bci();
2551 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2552 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci(), "invalid bci");
2553
2554 // join with all potential exception handlers
2555 XHandlers* list = cur_scope_data->xhandlers();
2556 const int n = list->length();
2557 for (int i = 0; i < n; i++) {
2558 XHandler* h = list->handler_at(i);
2559 if (h->covers(cur_bci)) {
2560 // h is a potential exception handler => join it
2561 compilation()->set_has_exception_handlers(true);
2562
2563 BlockBegin* entry = h->entry_block();
2564 if (entry == block()) {
2565 // It's acceptable for an exception handler to cover itself
2566 // but we don't handle that in the parser currently. It's
2567 // very rare so we bailout instead of trying to handle it.
2568 BAILOUT_("exception handler covers itself", exception_handlers);
2569 }
2570 assert(entry->bci() == h->handler_bci(), "must match");
2571 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond");
2572
2573 // previously this was a BAILOUT, but this is not necessary
2574 // now because asynchronous exceptions are not handled this way.
2575 assert(entry->state() == NULL || cur_state->total_locks_size() == entry->state()->total_locks_size(), "locks do not match");
2576
2577 // xhandler start with an empty expression stack
2578 if (cur_state->stack_size() != 0) {
2579 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
2580 }
2581 if (instruction->exception_state() == NULL) {
2582 instruction->set_exception_state(cur_state);
2583 }
2584
2585 // Note: Usually this join must work. However, very
2586 // complicated jsr-ret structures where we don't ret from
2587 // the subroutine can cause the objects on the monitor
2588 // stacks to not match because blocks can be parsed twice.
2589 // The only test case we've seen so far which exhibits this
2590 // problem is caught by the infinite recursion test in
2591 // GraphBuilder::jsr() if the join doesn't work.
2592 if (!entry->try_merge(cur_state)) {
2593 BAILOUT_("error while joining with exception handler, prob. due to complicated jsr/rets", exception_handlers);
2594 }
2595
2596 // add current state for correct handling of phi functions at begin of xhandler
2597 int phi_operand = entry->add_exception_state(cur_state);
2598
2599 // add entry to the list of xhandlers of this block
2600 _block->add_exception_handler(entry);
2601
2602 // add back-edge from xhandler entry to this block
2603 if (!entry->is_predecessor(_block)) {
2604 entry->add_predecessor(_block);
2605 }
2606
2607 // clone XHandler because phi_operand and scope_count can not be shared
2608 XHandler* new_xhandler = new XHandler(h);
2609 new_xhandler->set_phi_operand(phi_operand);
2610 new_xhandler->set_scope_count(scope_count);
2611 exception_handlers->append(new_xhandler);
2612
2613 // fill in exception handler subgraph lazily
2614 assert(!entry->is_set(BlockBegin::was_visited_flag), "entry must not be visited yet");
2615 cur_scope_data->add_to_work_list(entry);
2616
2617 // stop when reaching catchall
2618 if (h->catch_type() == 0) {
2619 return exception_handlers;
2620 }
2621 }
2622 }
2623
2624 if (exception_handlers->length() == 0) {
2625 // This scope and all callees do not handle exceptions, so the local
2626 // variables of this scope are not needed. However, the scope itself is
2627 // required for a correct exception stack trace -> clear out the locals.
2628 if (_compilation->env()->should_retain_local_variables()) {
2629 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
2630 } else {
2631 cur_state = cur_state->copy(ValueStack::EmptyExceptionState, cur_state->bci());
2632 }
2633 if (prev_state != NULL) {
2634 prev_state->set_caller_state(cur_state);
2635 }
2636 if (instruction->exception_state() == NULL) {
2637 instruction->set_exception_state(cur_state);
2638 }
2639 }
2640
2641 // Set up iteration for next time.
2642 // If parsing a jsr, do not grab exception handlers from the
2643 // parent scopes for this method (already got them, and they
2644 // needed to be cloned)
2645
2646 while (cur_scope_data->parsing_jsr()) {
2647 cur_scope_data = cur_scope_data->parent();
2648 }
2649
2650 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2651 assert(cur_state->locks_size() == 0 || cur_state->locks_size() == 1, "unlocking must be done in a catchall exception handler");
2652
2653 prev_state = cur_state;
2654 cur_state = cur_state->caller_state();
2655 cur_scope_data = cur_scope_data->parent();
2656 scope_count++;
2657 } while (cur_scope_data != NULL);
2658
2659 return exception_handlers;
2660 }
2661
2662
2663 // Helper class for simplifying Phis.
2664 class PhiSimplifier : public BlockClosure {
2665 private:
2666 bool _has_substitutions;
2667 Value simplify(Value v);
2668
2669 public:
2670 PhiSimplifier(BlockBegin* start) : _has_substitutions(false) {
2671 start->iterate_preorder(this);
2672 if (_has_substitutions) {
2673 SubstitutionResolver sr(start);
2674 }
2675 }
2676 void block_do(BlockBegin* b);
2677 bool has_substitutions() const { return _has_substitutions; }
2678 };
2679
2680
2681 Value PhiSimplifier::simplify(Value v) {
2682 Phi* phi = v->as_Phi();
2683
2684 if (phi == NULL) {
2685 // no phi function
2686 return v;
2687 } else if (v->has_subst()) {
2688 // already substituted; subst can be phi itself -> simplify
2689 return simplify(v->subst());
2690 } else if (phi->is_set(Phi::cannot_simplify)) {
2691 // already tried to simplify phi before
2692 return phi;
2693 } else if (phi->is_set(Phi::visited)) {
2694 // break cycles in phi functions
2695 return phi;
2696 } else if (phi->type()->is_illegal()) {
2697 // illegal phi functions are ignored anyway
2698 return phi;
2699
2700 } else {
2701 // mark phi function as processed to break cycles in phi functions
2702 phi->set(Phi::visited);
2703
2704 // simplify x = [y, x] and x = [y, y] to y
2705 Value subst = NULL;
2706 int opd_count = phi->operand_count();
2707 for (int i = 0; i < opd_count; i++) {
2708 Value opd = phi->operand_at(i);
2709 assert(opd != NULL, "Operand must exist!");
2710
2711 if (opd->type()->is_illegal()) {
2712 // if one operand is illegal, the entire phi function is illegal
2713 phi->make_illegal();
2714 phi->clear(Phi::visited);
2715 return phi;
2716 }
2717
2718 Value new_opd = simplify(opd);
2719 assert(new_opd != NULL, "Simplified operand must exist!");
2720
2721 if (new_opd != phi && new_opd != subst) {
2722 if (subst == NULL) {
2723 subst = new_opd;
2724 } else {
2725 // no simplification possible
2726 phi->set(Phi::cannot_simplify);
2727 phi->clear(Phi::visited);
2728 return phi;
2729 }
2730 }
2731 }
2732
2733 // sucessfully simplified phi function
2734 assert(subst != NULL, "illegal phi function");
2735 _has_substitutions = true;
2736 phi->clear(Phi::visited);
2737 phi->set_subst(subst);
2738
2739 #ifndef PRODUCT
2740 if (PrintPhiFunctions) {
2741 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());
2742 }
2743 #endif
2744
2745 return subst;
2746 }
2747 }
2748
2749
2750 void PhiSimplifier::block_do(BlockBegin* b) {
2751 for_each_phi_fun(b, phi,
2752 simplify(phi);
2753 );
2754
2755 #ifdef ASSERT
2756 for_each_phi_fun(b, phi,
2757 assert(phi->operand_count() != 1 || phi->subst() != phi, "missed trivial simplification");
2758 );
2759
2760 ValueStack* state = b->state()->caller_state();
2761 for_each_state_value(state, value,
2762 Phi* phi = value->as_Phi();
2763 assert(phi == NULL || phi->block() != b, "must not have phi function to simplify in caller state");
2764 );
2765 #endif
2766 }
2767
2768 // This method is called after all blocks are filled with HIR instructions
2769 // It eliminates all Phi functions of the form x = [y, y] and x = [y, x]
2770 void GraphBuilder::eliminate_redundant_phis(BlockBegin* start) {
2771 PhiSimplifier simplifier(start);
2772 }
2773
2774
2775 void GraphBuilder::connect_to_end(BlockBegin* beg) {
2776 // setup iteration
2777 kill_all();
2778 _block = beg;
2779 _state = beg->state()->copy_for_parsing();
2780 _last = beg;
2781 iterate_bytecodes_for_block(beg->bci());
2782 }
2783
2784
2785 BlockEnd* GraphBuilder::iterate_bytecodes_for_block(int bci) {
2786 #ifndef PRODUCT
2787 if (PrintIRDuringConstruction) {
2788 tty->cr();
2789 InstructionPrinter ip;
2790 ip.print_instr(_block); tty->cr();
2791 ip.print_stack(_block->state()); tty->cr();
2792 ip.print_inline_level(_block);
2793 ip.print_head();
2794 tty->print_cr("locals size: %d stack size: %d", state()->locals_size(), state()->stack_size());
2795 }
2796 #endif
2797 _skip_block = false;
2798 assert(state() != NULL, "ValueStack missing!");
2799 CompileLog* log = compilation()->log();
2800 ciBytecodeStream s(method());
2801 s.reset_to_bci(bci);
2802 int prev_bci = bci;
2803 scope_data()->set_stream(&s);
2804 // iterate
2805 Bytecodes::Code code = Bytecodes::_illegal;
2806 bool push_exception = false;
2807
2808 if (block()->is_set(BlockBegin::exception_entry_flag) && block()->next() == NULL) {
2809 // first thing in the exception entry block should be the exception object.
2810 push_exception = true;
2811 }
2812
2813 bool ignore_return = scope_data()->ignore_return();
2814
2815 while (!bailed_out() && last()->as_BlockEnd() == NULL &&
2816 (code = stream()->next()) != ciBytecodeStream::EOBC() &&
2817 (block_at(s.cur_bci()) == NULL || block_at(s.cur_bci()) == block())) {
2818 assert(state()->kind() == ValueStack::Parsing, "invalid state kind");
2819
2820 if (log != NULL)
2821 log->set_context("bc code='%d' bci='%d'", (int)code, s.cur_bci());
2822
2823 // Check for active jsr during OSR compilation
2824 if (compilation()->is_osr_compile()
2825 && scope()->is_top_scope()
2826 && parsing_jsr()
2827 && s.cur_bci() == compilation()->osr_bci()) {
2828 bailout("OSR not supported while a jsr is active");
2829 }
2830
2831 if (push_exception) {
2832 apush(append(new ExceptionObject()));
2833 push_exception = false;
2834 }
2835
2836 // handle bytecode
2837 switch (code) {
2838 case Bytecodes::_nop : /* nothing to do */ break;
2839 case Bytecodes::_aconst_null : apush(append(new Constant(objectNull ))); break;
2840 case Bytecodes::_iconst_m1 : ipush(append(new Constant(new IntConstant (-1)))); break;
2841 case Bytecodes::_iconst_0 : ipush(append(new Constant(intZero ))); break;
2842 case Bytecodes::_iconst_1 : ipush(append(new Constant(intOne ))); break;
2843 case Bytecodes::_iconst_2 : ipush(append(new Constant(new IntConstant ( 2)))); break;
2844 case Bytecodes::_iconst_3 : ipush(append(new Constant(new IntConstant ( 3)))); break;
2845 case Bytecodes::_iconst_4 : ipush(append(new Constant(new IntConstant ( 4)))); break;
2846 case Bytecodes::_iconst_5 : ipush(append(new Constant(new IntConstant ( 5)))); break;
2847 case Bytecodes::_lconst_0 : lpush(append(new Constant(new LongConstant ( 0)))); break;
2848 case Bytecodes::_lconst_1 : lpush(append(new Constant(new LongConstant ( 1)))); break;
2849 case Bytecodes::_fconst_0 : fpush(append(new Constant(new FloatConstant ( 0)))); break;
2850 case Bytecodes::_fconst_1 : fpush(append(new Constant(new FloatConstant ( 1)))); break;
2851 case Bytecodes::_fconst_2 : fpush(append(new Constant(new FloatConstant ( 2)))); break;
2852 case Bytecodes::_dconst_0 : dpush(append(new Constant(new DoubleConstant( 0)))); break;
2853 case Bytecodes::_dconst_1 : dpush(append(new Constant(new DoubleConstant( 1)))); break;
2854 case Bytecodes::_bipush : ipush(append(new Constant(new IntConstant(((signed char*)s.cur_bcp())[1])))); break;
2855 case Bytecodes::_sipush : ipush(append(new Constant(new IntConstant((short)Bytes::get_Java_u2(s.cur_bcp()+1))))); break;
2856 case Bytecodes::_ldc : // fall through
2857 case Bytecodes::_ldc_w : // fall through
2858 case Bytecodes::_ldc2_w : load_constant(); break;
2859 case Bytecodes::_iload : load_local(intType , s.get_index()); break;
2860 case Bytecodes::_lload : load_local(longType , s.get_index()); break;
2861 case Bytecodes::_fload : load_local(floatType , s.get_index()); break;
2862 case Bytecodes::_dload : load_local(doubleType , s.get_index()); break;
2863 case Bytecodes::_aload : load_local(instanceType, s.get_index()); break;
2864 case Bytecodes::_iload_0 : load_local(intType , 0); break;
2865 case Bytecodes::_iload_1 : load_local(intType , 1); break;
2866 case Bytecodes::_iload_2 : load_local(intType , 2); break;
2867 case Bytecodes::_iload_3 : load_local(intType , 3); break;
2868 case Bytecodes::_lload_0 : load_local(longType , 0); break;
2869 case Bytecodes::_lload_1 : load_local(longType , 1); break;
2870 case Bytecodes::_lload_2 : load_local(longType , 2); break;
2871 case Bytecodes::_lload_3 : load_local(longType , 3); break;
2872 case Bytecodes::_fload_0 : load_local(floatType , 0); break;
2873 case Bytecodes::_fload_1 : load_local(floatType , 1); break;
2874 case Bytecodes::_fload_2 : load_local(floatType , 2); break;
2875 case Bytecodes::_fload_3 : load_local(floatType , 3); break;
2876 case Bytecodes::_dload_0 : load_local(doubleType, 0); break;
2877 case Bytecodes::_dload_1 : load_local(doubleType, 1); break;
2878 case Bytecodes::_dload_2 : load_local(doubleType, 2); break;
2879 case Bytecodes::_dload_3 : load_local(doubleType, 3); break;
2880 case Bytecodes::_aload_0 : load_local(objectType, 0); break;
2881 case Bytecodes::_aload_1 : load_local(objectType, 1); break;
2882 case Bytecodes::_aload_2 : load_local(objectType, 2); break;
2883 case Bytecodes::_aload_3 : load_local(objectType, 3); break;
2884 case Bytecodes::_iaload : load_indexed(T_INT ); break;
2885 case Bytecodes::_laload : load_indexed(T_LONG ); break;
2886 case Bytecodes::_faload : load_indexed(T_FLOAT ); break;
2887 case Bytecodes::_daload : load_indexed(T_DOUBLE); break;
2888 case Bytecodes::_aaload : load_indexed(T_OBJECT); break;
2889 case Bytecodes::_baload : load_indexed(T_BYTE ); break;
2890 case Bytecodes::_caload : load_indexed(T_CHAR ); break;
2891 case Bytecodes::_saload : load_indexed(T_SHORT ); break;
2892 case Bytecodes::_istore : store_local(intType , s.get_index()); break;
2893 case Bytecodes::_lstore : store_local(longType , s.get_index()); break;
2894 case Bytecodes::_fstore : store_local(floatType , s.get_index()); break;
2895 case Bytecodes::_dstore : store_local(doubleType, s.get_index()); break;
2896 case Bytecodes::_astore : store_local(objectType, s.get_index()); break;
2897 case Bytecodes::_istore_0 : store_local(intType , 0); break;
2898 case Bytecodes::_istore_1 : store_local(intType , 1); break;
2899 case Bytecodes::_istore_2 : store_local(intType , 2); break;
2900 case Bytecodes::_istore_3 : store_local(intType , 3); break;
2901 case Bytecodes::_lstore_0 : store_local(longType , 0); break;
2902 case Bytecodes::_lstore_1 : store_local(longType , 1); break;
2903 case Bytecodes::_lstore_2 : store_local(longType , 2); break;
2904 case Bytecodes::_lstore_3 : store_local(longType , 3); break;
2905 case Bytecodes::_fstore_0 : store_local(floatType , 0); break;
2906 case Bytecodes::_fstore_1 : store_local(floatType , 1); break;
2907 case Bytecodes::_fstore_2 : store_local(floatType , 2); break;
2908 case Bytecodes::_fstore_3 : store_local(floatType , 3); break;
2909 case Bytecodes::_dstore_0 : store_local(doubleType, 0); break;
2910 case Bytecodes::_dstore_1 : store_local(doubleType, 1); break;
2911 case Bytecodes::_dstore_2 : store_local(doubleType, 2); break;
2912 case Bytecodes::_dstore_3 : store_local(doubleType, 3); break;
2913 case Bytecodes::_astore_0 : store_local(objectType, 0); break;
2914 case Bytecodes::_astore_1 : store_local(objectType, 1); break;
2915 case Bytecodes::_astore_2 : store_local(objectType, 2); break;
2916 case Bytecodes::_astore_3 : store_local(objectType, 3); break;
2917 case Bytecodes::_iastore : store_indexed(T_INT ); break;
2918 case Bytecodes::_lastore : store_indexed(T_LONG ); break;
2919 case Bytecodes::_fastore : store_indexed(T_FLOAT ); break;
2920 case Bytecodes::_dastore : store_indexed(T_DOUBLE); break;
2921 case Bytecodes::_aastore : store_indexed(T_OBJECT); break;
2922 case Bytecodes::_bastore : store_indexed(T_BYTE ); break;
2923 case Bytecodes::_castore : store_indexed(T_CHAR ); break;
2924 case Bytecodes::_sastore : store_indexed(T_SHORT ); break;
2925 case Bytecodes::_pop : // fall through
2926 case Bytecodes::_pop2 : // fall through
2927 case Bytecodes::_dup : // fall through
2928 case Bytecodes::_dup_x1 : // fall through
2929 case Bytecodes::_dup_x2 : // fall through
2930 case Bytecodes::_dup2 : // fall through
2931 case Bytecodes::_dup2_x1 : // fall through
2932 case Bytecodes::_dup2_x2 : // fall through
2933 case Bytecodes::_swap : stack_op(code); break;
2934 case Bytecodes::_iadd : arithmetic_op(intType , code); break;
2935 case Bytecodes::_ladd : arithmetic_op(longType , code); break;
2936 case Bytecodes::_fadd : arithmetic_op(floatType , code); break;
2937 case Bytecodes::_dadd : arithmetic_op(doubleType, code); break;
2938 case Bytecodes::_isub : arithmetic_op(intType , code); break;
2939 case Bytecodes::_lsub : arithmetic_op(longType , code); break;
2940 case Bytecodes::_fsub : arithmetic_op(floatType , code); break;
2941 case Bytecodes::_dsub : arithmetic_op(doubleType, code); break;
2942 case Bytecodes::_imul : arithmetic_op(intType , code); break;
2943 case Bytecodes::_lmul : arithmetic_op(longType , code); break;
2944 case Bytecodes::_fmul : arithmetic_op(floatType , code); break;
2945 case Bytecodes::_dmul : arithmetic_op(doubleType, code); break;
2946 case Bytecodes::_idiv : arithmetic_op(intType , code, copy_state_for_exception()); break;
2947 case Bytecodes::_ldiv : arithmetic_op(longType , code, copy_state_for_exception()); break;
2948 case Bytecodes::_fdiv : arithmetic_op(floatType , code); break;
2949 case Bytecodes::_ddiv : arithmetic_op(doubleType, code); break;
2950 case Bytecodes::_irem : arithmetic_op(intType , code, copy_state_for_exception()); break;
2951 case Bytecodes::_lrem : arithmetic_op(longType , code, copy_state_for_exception()); break;
2952 case Bytecodes::_frem : arithmetic_op(floatType , code); break;
2953 case Bytecodes::_drem : arithmetic_op(doubleType, code); break;
2954 case Bytecodes::_ineg : negate_op(intType ); break;
2955 case Bytecodes::_lneg : negate_op(longType ); break;
2956 case Bytecodes::_fneg : negate_op(floatType ); break;
2957 case Bytecodes::_dneg : negate_op(doubleType); break;
2958 case Bytecodes::_ishl : shift_op(intType , code); break;
2959 case Bytecodes::_lshl : shift_op(longType, code); break;
2960 case Bytecodes::_ishr : shift_op(intType , code); break;
2961 case Bytecodes::_lshr : shift_op(longType, code); break;
2962 case Bytecodes::_iushr : shift_op(intType , code); break;
2963 case Bytecodes::_lushr : shift_op(longType, code); break;
2964 case Bytecodes::_iand : logic_op(intType , code); break;
2965 case Bytecodes::_land : logic_op(longType, code); break;
2966 case Bytecodes::_ior : logic_op(intType , code); break;
2967 case Bytecodes::_lor : logic_op(longType, code); break;
2968 case Bytecodes::_ixor : logic_op(intType , code); break;
2969 case Bytecodes::_lxor : logic_op(longType, code); break;
2970 case Bytecodes::_iinc : increment(); break;
2971 case Bytecodes::_i2l : convert(code, T_INT , T_LONG ); break;
2972 case Bytecodes::_i2f : convert(code, T_INT , T_FLOAT ); break;
2973 case Bytecodes::_i2d : convert(code, T_INT , T_DOUBLE); break;
2974 case Bytecodes::_l2i : convert(code, T_LONG , T_INT ); break;
2975 case Bytecodes::_l2f : convert(code, T_LONG , T_FLOAT ); break;
2976 case Bytecodes::_l2d : convert(code, T_LONG , T_DOUBLE); break;
2977 case Bytecodes::_f2i : convert(code, T_FLOAT , T_INT ); break;
2978 case Bytecodes::_f2l : convert(code, T_FLOAT , T_LONG ); break;
2979 case Bytecodes::_f2d : convert(code, T_FLOAT , T_DOUBLE); break;
2980 case Bytecodes::_d2i : convert(code, T_DOUBLE, T_INT ); break;
2981 case Bytecodes::_d2l : convert(code, T_DOUBLE, T_LONG ); break;
2982 case Bytecodes::_d2f : convert(code, T_DOUBLE, T_FLOAT ); break;
2983 case Bytecodes::_i2b : convert(code, T_INT , T_BYTE ); break;
2984 case Bytecodes::_i2c : convert(code, T_INT , T_CHAR ); break;
2985 case Bytecodes::_i2s : convert(code, T_INT , T_SHORT ); break;
2986 case Bytecodes::_lcmp : compare_op(longType , code); break;
2987 case Bytecodes::_fcmpl : compare_op(floatType , code); break;
2988 case Bytecodes::_fcmpg : compare_op(floatType , code); break;
2989 case Bytecodes::_dcmpl : compare_op(doubleType, code); break;
2990 case Bytecodes::_dcmpg : compare_op(doubleType, code); break;
2991 case Bytecodes::_ifeq : if_zero(intType , If::eql); break;
2992 case Bytecodes::_ifne : if_zero(intType , If::neq); break;
2993 case Bytecodes::_iflt : if_zero(intType , If::lss); break;
2994 case Bytecodes::_ifge : if_zero(intType , If::geq); break;
2995 case Bytecodes::_ifgt : if_zero(intType , If::gtr); break;
2996 case Bytecodes::_ifle : if_zero(intType , If::leq); break;
2997 case Bytecodes::_if_icmpeq : if_same(intType , If::eql); break;
2998 case Bytecodes::_if_icmpne : if_same(intType , If::neq); break;
2999 case Bytecodes::_if_icmplt : if_same(intType , If::lss); break;
3000 case Bytecodes::_if_icmpge : if_same(intType , If::geq); break;
3001 case Bytecodes::_if_icmpgt : if_same(intType , If::gtr); break;
3002 case Bytecodes::_if_icmple : if_same(intType , If::leq); break;
3003 case Bytecodes::_if_acmpeq : if_same(objectType, If::eql); break;
3004 case Bytecodes::_if_acmpne : if_same(objectType, If::neq); break;
3005 case Bytecodes::_goto : _goto(s.cur_bci(), s.get_dest()); break;
3006 case Bytecodes::_jsr : jsr(s.get_dest()); break;
3007 case Bytecodes::_ret : ret(s.get_index()); break;
3008 case Bytecodes::_tableswitch : table_switch(); break;
3009 case Bytecodes::_lookupswitch : lookup_switch(); break;
3010 case Bytecodes::_ireturn : method_return(ipop(), ignore_return); break;
3011 case Bytecodes::_lreturn : method_return(lpop(), ignore_return); break;
3012 case Bytecodes::_freturn : method_return(fpop(), ignore_return); break;
3013 case Bytecodes::_dreturn : method_return(dpop(), ignore_return); break;
3014 case Bytecodes::_areturn : method_return(apop(), ignore_return); break;
3015 case Bytecodes::_return : method_return(NULL , ignore_return); break;
3016 case Bytecodes::_getstatic : // fall through
3017 case Bytecodes::_putstatic : // fall through
3018 case Bytecodes::_getfield : // fall through
3019 case Bytecodes::_putfield : access_field(code); break;
3020 case Bytecodes::_invokevirtual : // fall through
3021 case Bytecodes::_invokespecial : // fall through
3022 case Bytecodes::_invokestatic : // fall through
3023 case Bytecodes::_invokedynamic : // fall through
3024 case Bytecodes::_invokeinterface: invoke(code); break;
3025 case Bytecodes::_new : new_instance(s.get_index_u2()); break;
3026 case Bytecodes::_newarray : new_type_array(); break;
3027 case Bytecodes::_anewarray : new_object_array(); break;
3028 case Bytecodes::_arraylength : { ValueStack* state_before = copy_state_for_exception(); ipush(append(new ArrayLength(apop(), state_before))); break; }
3029 case Bytecodes::_athrow : throw_op(s.cur_bci()); break;
3030 case Bytecodes::_checkcast : check_cast(s.get_index_u2()); break;
3031 case Bytecodes::_instanceof : instance_of(s.get_index_u2()); break;
3032 case Bytecodes::_monitorenter : monitorenter(apop(), s.cur_bci()); break;
3033 case Bytecodes::_monitorexit : monitorexit (apop(), s.cur_bci()); break;
3034 case Bytecodes::_wide : ShouldNotReachHere(); break;
3035 case Bytecodes::_multianewarray : new_multi_array(s.cur_bcp()[3]); break;
3036 case Bytecodes::_ifnull : if_null(objectType, If::eql); break;
3037 case Bytecodes::_ifnonnull : if_null(objectType, If::neq); break;
3038 case Bytecodes::_goto_w : _goto(s.cur_bci(), s.get_far_dest()); break;
3039 case Bytecodes::_jsr_w : jsr(s.get_far_dest()); break;
3040 case Bytecodes::_defaultvalue : new_value_type_instance(s.get_index_u2()); break;
3041 case Bytecodes::_withfield : withfield(s.get_index_u2()); break;
3042 case Bytecodes::_breakpoint : BAILOUT_("concurrent setting of breakpoint", NULL);
3043 default : ShouldNotReachHere(); break;
3044 }
3045
3046 if (log != NULL)
3047 log->clear_context(); // skip marker if nothing was printed
3048
3049 // save current bci to setup Goto at the end
3050 prev_bci = s.cur_bci();
3051
3052 }
3053 CHECK_BAILOUT_(NULL);
3054 // stop processing of this block (see try_inline_full)
3055 if (_skip_block) {
3056 _skip_block = false;
3057 assert(_last && _last->as_BlockEnd(), "");
3058 return _last->as_BlockEnd();
3059 }
3060 // if there are any, check if last instruction is a BlockEnd instruction
3061 BlockEnd* end = last()->as_BlockEnd();
3062 if (end == NULL) {
3063 // all blocks must end with a BlockEnd instruction => add a Goto
3064 end = new Goto(block_at(s.cur_bci()), false);
3065 append(end);
3066 }
3067 assert(end == last()->as_BlockEnd(), "inconsistency");
3068
3069 assert(end->state() != NULL, "state must already be present");
3070 assert(end->as_Return() == NULL || end->as_Throw() == NULL || end->state()->stack_size() == 0, "stack not needed for return and throw");
3071
3072 // connect to begin & set state
3073 // NOTE that inlining may have changed the block we are parsing
3074 block()->set_end(end);
3075 // propagate state
3076 for (int i = end->number_of_sux() - 1; i >= 0; i--) {
3077 BlockBegin* sux = end->sux_at(i);
3078 assert(sux->is_predecessor(block()), "predecessor missing");
3079 // be careful, bailout if bytecodes are strange
3080 if (!sux->try_merge(end->state())) BAILOUT_("block join failed", NULL);
3081 scope_data()->add_to_work_list(end->sux_at(i));
3082 }
3083
3084 scope_data()->set_stream(NULL);
3085
3086 // done
3087 return end;
3088 }
3089
3090
3091 void GraphBuilder::iterate_all_blocks(bool start_in_current_block_for_inlining) {
3092 do {
3093 if (start_in_current_block_for_inlining && !bailed_out()) {
3094 iterate_bytecodes_for_block(0);
3095 start_in_current_block_for_inlining = false;
3096 } else {
3097 BlockBegin* b;
3098 while ((b = scope_data()->remove_from_work_list()) != NULL) {
3099 if (!b->is_set(BlockBegin::was_visited_flag)) {
3100 if (b->is_set(BlockBegin::osr_entry_flag)) {
3101 // we're about to parse the osr entry block, so make sure
3102 // we setup the OSR edge leading into this block so that
3103 // Phis get setup correctly.
3104 setup_osr_entry_block();
3105 // this is no longer the osr entry block, so clear it.
3106 b->clear(BlockBegin::osr_entry_flag);
3107 }
3108 b->set(BlockBegin::was_visited_flag);
3109 connect_to_end(b);
3110 }
3111 }
3112 }
3113 } while (!bailed_out() && !scope_data()->is_work_list_empty());
3114 }
3115
3116
3117 bool GraphBuilder::_can_trap [Bytecodes::number_of_java_codes];
3118
3119 void GraphBuilder::initialize() {
3120 // the following bytecodes are assumed to potentially
3121 // throw exceptions in compiled code - note that e.g.
3122 // monitorexit & the return bytecodes do not throw
3123 // exceptions since monitor pairing proved that they
3124 // succeed (if monitor pairing succeeded)
3125 Bytecodes::Code can_trap_list[] =
3126 { Bytecodes::_ldc
3127 , Bytecodes::_ldc_w
3128 , Bytecodes::_ldc2_w
3129 , Bytecodes::_iaload
3130 , Bytecodes::_laload
3131 , Bytecodes::_faload
3132 , Bytecodes::_daload
3133 , Bytecodes::_aaload
3134 , Bytecodes::_baload
3135 , Bytecodes::_caload
3136 , Bytecodes::_saload
3137 , Bytecodes::_iastore
3138 , Bytecodes::_lastore
3139 , Bytecodes::_fastore
3140 , Bytecodes::_dastore
3141 , Bytecodes::_aastore
3142 , Bytecodes::_bastore
3143 , Bytecodes::_castore
3144 , Bytecodes::_sastore
3145 , Bytecodes::_idiv
3146 , Bytecodes::_ldiv
3147 , Bytecodes::_irem
3148 , Bytecodes::_lrem
3149 , Bytecodes::_getstatic
3150 , Bytecodes::_putstatic
3151 , Bytecodes::_getfield
3152 , Bytecodes::_putfield
3153 , Bytecodes::_invokevirtual
3154 , Bytecodes::_invokespecial
3155 , Bytecodes::_invokestatic
3156 , Bytecodes::_invokedynamic
3157 , Bytecodes::_invokeinterface
3158 , Bytecodes::_new
3159 , Bytecodes::_newarray
3160 , Bytecodes::_anewarray
3161 , Bytecodes::_arraylength
3162 , Bytecodes::_athrow
3163 , Bytecodes::_checkcast
3164 , Bytecodes::_instanceof
3165 , Bytecodes::_monitorenter
3166 , Bytecodes::_multianewarray
3167 };
3168
3169 // inititialize trap tables
3170 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) {
3171 _can_trap[i] = false;
3172 }
3173 // set standard trap info
3174 for (uint j = 0; j < ARRAY_SIZE(can_trap_list); j++) {
3175 _can_trap[can_trap_list[j]] = true;
3176 }
3177 }
3178
3179
3180 BlockBegin* GraphBuilder::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) {
3181 assert(entry->is_set(f), "entry/flag mismatch");
3182 // create header block
3183 BlockBegin* h = new BlockBegin(entry->bci());
3184 h->set_depth_first_number(0);
3185
3186 Value l = h;
3187 BlockEnd* g = new Goto(entry, false);
3188 l->set_next(g, entry->bci());
3189 h->set_end(g);
3190 h->set(f);
3191 // setup header block end state
3192 ValueStack* s = state->copy(ValueStack::StateAfter, entry->bci()); // can use copy since stack is empty (=> no phis)
3193 assert(s->stack_is_empty(), "must have empty stack at entry point");
3194 g->set_state(s);
3195 return h;
3196 }
3197
3198
3199
3200 BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* state) {
3201 BlockBegin* start = new BlockBegin(0);
3202
3203 // This code eliminates the empty start block at the beginning of
3204 // each method. Previously, each method started with the
3205 // start-block created below, and this block was followed by the
3206 // header block that was always empty. This header block is only
3207 // necesary if std_entry is also a backward branch target because
3208 // then phi functions may be necessary in the header block. It's
3209 // also necessary when profiling so that there's a single block that
3210 // can increment the interpreter_invocation_count.
3211 BlockBegin* new_header_block;
3212 if (std_entry->number_of_preds() > 0 || count_invocations() || count_backedges()) {
3213 new_header_block = header_block(std_entry, BlockBegin::std_entry_flag, state);
3214 } else {
3215 new_header_block = std_entry;
3216 }
3217
3218 // setup start block (root for the IR graph)
3219 Base* base =
3220 new Base(
3221 new_header_block,
3222 osr_entry
3223 );
3224 start->set_next(base, 0);
3225 start->set_end(base);
3226 // create & setup state for start block
3227 start->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
3228 base->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
3229
3230 if (base->std_entry()->state() == NULL) {
3231 // setup states for header blocks
3232 base->std_entry()->merge(state);
3233 }
3234
3235 assert(base->std_entry()->state() != NULL, "");
3236 return start;
3237 }
3238
3239
3240 void GraphBuilder::setup_osr_entry_block() {
3241 assert(compilation()->is_osr_compile(), "only for osrs");
3242
3243 int osr_bci = compilation()->osr_bci();
3244 ciBytecodeStream s(method());
3245 s.reset_to_bci(osr_bci);
3246 s.next();
3247 scope_data()->set_stream(&s);
3248
3249 // create a new block to be the osr setup code
3250 _osr_entry = new BlockBegin(osr_bci);
3251 _osr_entry->set(BlockBegin::osr_entry_flag);
3252 _osr_entry->set_depth_first_number(0);
3253 BlockBegin* target = bci2block()->at(osr_bci);
3254 assert(target != NULL && target->is_set(BlockBegin::osr_entry_flag), "must be there");
3255 // the osr entry has no values for locals
3256 ValueStack* state = target->state()->copy();
3257 _osr_entry->set_state(state);
3258
3259 kill_all();
3260 _block = _osr_entry;
3261 _state = _osr_entry->state()->copy();
3262 assert(_state->bci() == osr_bci, "mismatch");
3263 _last = _osr_entry;
3264 Value e = append(new OsrEntry());
3265 e->set_needs_null_check(false);
3266
3267 // OSR buffer is
3268 //
3269 // locals[nlocals-1..0]
3270 // monitors[number_of_locks-1..0]
3271 //
3272 // locals is a direct copy of the interpreter frame so in the osr buffer
3273 // so first slot in the local array is the last local from the interpreter
3274 // and last slot is local[0] (receiver) from the interpreter
3275 //
3276 // Similarly with locks. The first lock slot in the osr buffer is the nth lock
3277 // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock
3278 // in the interpreter frame (the method lock if a sync method)
3279
3280 // Initialize monitors in the compiled activation.
3281
3282 int index;
3283 Value local;
3284
3285 // find all the locals that the interpreter thinks contain live oops
3286 const ResourceBitMap live_oops = method()->live_local_oops_at_bci(osr_bci);
3287
3288 // compute the offset into the locals so that we can treat the buffer
3289 // as if the locals were still in the interpreter frame
3290 int locals_offset = BytesPerWord * (method()->max_locals() - 1);
3291 for_each_local_value(state, index, local) {
3292 int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord;
3293 Value get;
3294 if (local->type()->is_object_kind() && !live_oops.at(index)) {
3295 // The interpreter thinks this local is dead but the compiler
3296 // doesn't so pretend that the interpreter passed in null.
3297 get = append(new Constant(objectNull));
3298 } else {
3299 get = append(new UnsafeGetRaw(as_BasicType(local->type()), e,
3300 append(new Constant(new IntConstant(offset))),
3301 0,
3302 true /*unaligned*/, true /*wide*/));
3303 }
3304 _state->store_local(index, get);
3305 }
3306
3307 // the storage for the OSR buffer is freed manually in the LIRGenerator.
3308
3309 assert(state->caller_state() == NULL, "should be top scope");
3310 state->clear_locals();
3311 Goto* g = new Goto(target, false);
3312 append(g);
3313 _osr_entry->set_end(g);
3314 target->merge(_osr_entry->end()->state());
3315
3316 scope_data()->set_stream(NULL);
3317 }
3318
3319
3320 ValueStack* GraphBuilder::state_at_entry() {
3321 ValueStack* state = new ValueStack(scope(), NULL);
3322
3323 // Set up locals for receiver
3324 int idx = 0;
3325 if (!method()->is_static()) {
3326 // we should always see the receiver
3327 state->store_local(idx, new Local(method()->holder(), objectType, idx,
3328 /*receiver*/ true, /*never_null*/ method()->holder()->is_value_array_klass()));
3329 idx = 1;
3330 }
3331
3332 // Set up locals for incoming arguments
3333 ciSignature* sig = method()->signature();
3334 for (int i = 0; i < sig->count(); i++) {
3335 ciType* type = sig->type_at(i);
3336 BasicType basic_type = type->basic_type();
3337 // don't allow T_ARRAY to propagate into locals types
3338 if (basic_type == T_ARRAY || basic_type == T_VALUETYPE) basic_type = T_OBJECT;
3339 ValueType* vt = as_ValueType(basic_type);
3340 state->store_local(idx, new Local(type, vt, idx, false, sig->is_never_null_at(i)));
3341 idx += type->size();
3342 }
3343
3344 // lock synchronized method
3345 if (method()->is_synchronized()) {
3346 state->lock(NULL);
3347 }
3348
3349 return state;
3350 }
3351
3352
3353 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope)
3354 : _scope_data(NULL)
3355 , _compilation(compilation)
3356 , _memory(new MemoryBuffer())
3357 , _inline_bailout_msg(NULL)
3358 , _instruction_count(0)
3359 , _osr_entry(NULL)
3360 {
3361 int osr_bci = compilation->osr_bci();
3362
3363 // determine entry points and bci2block mapping
3364 BlockListBuilder blm(compilation, scope, osr_bci);
3365 CHECK_BAILOUT();
3366
3367 BlockList* bci2block = blm.bci2block();
3368 BlockBegin* start_block = bci2block->at(0);
3369
3370 push_root_scope(scope, bci2block, start_block);
3371
3372 // setup state for std entry
3373 _initial_state = state_at_entry();
3374 start_block->merge(_initial_state);
3375
3376 // complete graph
3377 _vmap = new ValueMap();
3378 switch (scope->method()->intrinsic_id()) {
3379 case vmIntrinsics::_dabs : // fall through
3380 case vmIntrinsics::_dsqrt : // fall through
3381 case vmIntrinsics::_dsin : // fall through
3382 case vmIntrinsics::_dcos : // fall through
3383 case vmIntrinsics::_dtan : // fall through
3384 case vmIntrinsics::_dlog : // fall through
3385 case vmIntrinsics::_dlog10 : // fall through
3386 case vmIntrinsics::_dexp : // fall through
3387 case vmIntrinsics::_dpow : // fall through
3388 {
3389 // Compiles where the root method is an intrinsic need a special
3390 // compilation environment because the bytecodes for the method
3391 // shouldn't be parsed during the compilation, only the special
3392 // Intrinsic node should be emitted. If this isn't done the the
3393 // code for the inlined version will be different than the root
3394 // compiled version which could lead to monotonicity problems on
3395 // intel.
3396 if (CheckIntrinsics && !scope->method()->intrinsic_candidate()) {
3397 BAILOUT("failed to inline intrinsic, method not annotated");
3398 }
3399
3400 // Set up a stream so that appending instructions works properly.
3401 ciBytecodeStream s(scope->method());
3402 s.reset_to_bci(0);
3403 scope_data()->set_stream(&s);
3404 s.next();
3405
3406 // setup the initial block state
3407 _block = start_block;
3408 _state = start_block->state()->copy_for_parsing();
3409 _last = start_block;
3410 load_local(doubleType, 0);
3411 if (scope->method()->intrinsic_id() == vmIntrinsics::_dpow) {
3412 load_local(doubleType, 2);
3413 }
3414
3415 // Emit the intrinsic node.
3416 bool result = try_inline_intrinsics(scope->method());
3417 if (!result) BAILOUT("failed to inline intrinsic");
3418 method_return(dpop());
3419
3420 // connect the begin and end blocks and we're all done.
3421 BlockEnd* end = last()->as_BlockEnd();
3422 block()->set_end(end);
3423 break;
3424 }
3425
3426 case vmIntrinsics::_Reference_get:
3427 {
3428 {
3429 // With java.lang.ref.reference.get() we must go through the
3430 // intrinsic - when G1 is enabled - even when get() is the root
3431 // method of the compile so that, if necessary, the value in
3432 // the referent field of the reference object gets recorded by
3433 // the pre-barrier code.
3434 // Specifically, if G1 is enabled, the value in the referent
3435 // field is recorded by the G1 SATB pre barrier. This will
3436 // result in the referent being marked live and the reference
3437 // object removed from the list of discovered references during
3438 // reference processing.
3439 if (CheckIntrinsics && !scope->method()->intrinsic_candidate()) {
3440 BAILOUT("failed to inline intrinsic, method not annotated");
3441 }
3442
3443 // Also we need intrinsic to prevent commoning reads from this field
3444 // across safepoint since GC can change its value.
3445
3446 // Set up a stream so that appending instructions works properly.
3447 ciBytecodeStream s(scope->method());
3448 s.reset_to_bci(0);
3449 scope_data()->set_stream(&s);
3450 s.next();
3451
3452 // setup the initial block state
3453 _block = start_block;
3454 _state = start_block->state()->copy_for_parsing();
3455 _last = start_block;
3456 load_local(objectType, 0);
3457
3458 // Emit the intrinsic node.
3459 bool result = try_inline_intrinsics(scope->method());
3460 if (!result) BAILOUT("failed to inline intrinsic");
3461 method_return(apop());
3462
3463 // connect the begin and end blocks and we're all done.
3464 BlockEnd* end = last()->as_BlockEnd();
3465 block()->set_end(end);
3466 break;
3467 }
3468 // Otherwise, fall thru
3469 }
3470
3471 default:
3472 scope_data()->add_to_work_list(start_block);
3473 iterate_all_blocks();
3474 break;
3475 }
3476 CHECK_BAILOUT();
3477
3478 _start = setup_start_block(osr_bci, start_block, _osr_entry, _initial_state);
3479
3480 eliminate_redundant_phis(_start);
3481
3482 NOT_PRODUCT(if (PrintValueNumbering && Verbose) print_stats());
3483 // for osr compile, bailout if some requirements are not fulfilled
3484 if (osr_bci != -1) {
3485 BlockBegin* osr_block = blm.bci2block()->at(osr_bci);
3486 if (!osr_block->is_set(BlockBegin::was_visited_flag)) {
3487 BAILOUT("osr entry must have been visited for osr compile");
3488 }
3489
3490 // check if osr entry point has empty stack - we cannot handle non-empty stacks at osr entry points
3491 if (!osr_block->state()->stack_is_empty()) {
3492 BAILOUT("stack not empty at OSR entry point");
3493 }
3494 }
3495 #ifndef PRODUCT
3496 if (PrintCompilation && Verbose) tty->print_cr("Created %d Instructions", _instruction_count);
3497 #endif
3498 }
3499
3500
3501 ValueStack* GraphBuilder::copy_state_before() {
3502 return copy_state_before_with_bci(bci());
3503 }
3504
3505 ValueStack* GraphBuilder::copy_state_exhandling() {
3506 return copy_state_exhandling_with_bci(bci());
3507 }
3508
3509 ValueStack* GraphBuilder::copy_state_for_exception() {
3510 return copy_state_for_exception_with_bci(bci());
3511 }
3512
3513 ValueStack* GraphBuilder::copy_state_before_with_bci(int bci) {
3514 return state()->copy(ValueStack::StateBefore, bci);
3515 }
3516
3517 ValueStack* GraphBuilder::copy_state_exhandling_with_bci(int bci) {
3518 if (!has_handler()) return NULL;
3519 return state()->copy(ValueStack::StateBefore, bci);
3520 }
3521
3522 ValueStack* GraphBuilder::copy_state_for_exception_with_bci(int bci) {
3523 ValueStack* s = copy_state_exhandling_with_bci(bci);
3524 if (s == NULL) {
3525 if (_compilation->env()->should_retain_local_variables()) {
3526 s = state()->copy(ValueStack::ExceptionState, bci);
3527 } else {
3528 s = state()->copy(ValueStack::EmptyExceptionState, bci);
3529 }
3530 }
3531 return s;
3532 }
3533
3534 int GraphBuilder::recursive_inline_level(ciMethod* cur_callee) const {
3535 int recur_level = 0;
3536 for (IRScope* s = scope(); s != NULL; s = s->caller()) {
3537 if (s->method() == cur_callee) {
3538 ++recur_level;
3539 }
3540 }
3541 return recur_level;
3542 }
3543
3544
3545 bool GraphBuilder::try_inline(ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc, Value receiver) {
3546 const char* msg = NULL;
3547
3548 // clear out any existing inline bailout condition
3549 clear_inline_bailout();
3550
3551 // exclude methods we don't want to inline
3552 msg = should_not_inline(callee);
3553 if (msg != NULL) {
3554 print_inlining(callee, msg, /*success*/ false);
3555 return false;
3556 }
3557
3558 // method handle invokes
3559 if (callee->is_method_handle_intrinsic()) {
3560 if (try_method_handle_inline(callee, ignore_return)) {
3561 if (callee->has_reserved_stack_access()) {
3562 compilation()->set_has_reserved_stack_access(true);
3563 }
3564 return true;
3565 }
3566 return false;
3567 }
3568
3569 // handle intrinsics
3570 if (callee->intrinsic_id() != vmIntrinsics::_none &&
3571 (CheckIntrinsics ? callee->intrinsic_candidate() : true)) {
3572 if (try_inline_intrinsics(callee, ignore_return)) {
3573 print_inlining(callee, "intrinsic");
3574 if (callee->has_reserved_stack_access()) {
3575 compilation()->set_has_reserved_stack_access(true);
3576 }
3577 return true;
3578 }
3579 // try normal inlining
3580 }
3581
3582 // certain methods cannot be parsed at all
3583 msg = check_can_parse(callee);
3584 if (msg != NULL) {
3585 print_inlining(callee, msg, /*success*/ false);
3586 return false;
3587 }
3588
3589 // If bytecode not set use the current one.
3590 if (bc == Bytecodes::_illegal) {
3591 bc = code();
3592 }
3593 if (try_inline_full(callee, holder_known, ignore_return, bc, receiver)) {
3594 if (callee->has_reserved_stack_access()) {
3595 compilation()->set_has_reserved_stack_access(true);
3596 }
3597 return true;
3598 }
3599
3600 // Entire compilation could fail during try_inline_full call.
3601 // In that case printing inlining decision info is useless.
3602 if (!bailed_out())
3603 print_inlining(callee, _inline_bailout_msg, /*success*/ false);
3604
3605 return false;
3606 }
3607
3608
3609 const char* GraphBuilder::check_can_parse(ciMethod* callee) const {
3610 // Certain methods cannot be parsed at all:
3611 if ( callee->is_native()) return "native method";
3612 if ( callee->is_abstract()) return "abstract method";
3613 if (!callee->can_be_compiled()) return "not compilable (disabled)";
3614 if (!callee->can_be_parsed()) return "cannot be parsed";
3615 return NULL;
3616 }
3617
3618 // negative filter: should callee NOT be inlined? returns NULL, ok to inline, or rejection msg
3619 const char* GraphBuilder::should_not_inline(ciMethod* callee) const {
3620 if ( compilation()->directive()->should_not_inline(callee)) return "disallowed by CompileCommand";
3621 if ( callee->dont_inline()) return "don't inline by annotation";
3622 return NULL;
3623 }
3624
3625 void GraphBuilder::build_graph_for_intrinsic(ciMethod* callee, bool ignore_return) {
3626 vmIntrinsics::ID id = callee->intrinsic_id();
3627 assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
3628
3629 // Some intrinsics need special IR nodes.
3630 switch(id) {
3631 case vmIntrinsics::_getReference : append_unsafe_get_obj(callee, T_OBJECT, false); return;
3632 case vmIntrinsics::_getBoolean : append_unsafe_get_obj(callee, T_BOOLEAN, false); return;
3633 case vmIntrinsics::_getByte : append_unsafe_get_obj(callee, T_BYTE, false); return;
3634 case vmIntrinsics::_getShort : append_unsafe_get_obj(callee, T_SHORT, false); return;
3635 case vmIntrinsics::_getChar : append_unsafe_get_obj(callee, T_CHAR, false); return;
3636 case vmIntrinsics::_getInt : append_unsafe_get_obj(callee, T_INT, false); return;
3637 case vmIntrinsics::_getLong : append_unsafe_get_obj(callee, T_LONG, false); return;
3638 case vmIntrinsics::_getFloat : append_unsafe_get_obj(callee, T_FLOAT, false); return;
3639 case vmIntrinsics::_getDouble : append_unsafe_get_obj(callee, T_DOUBLE, false); return;
3640 case vmIntrinsics::_putReference : append_unsafe_put_obj(callee, T_OBJECT, false); return;
3641 case vmIntrinsics::_putBoolean : append_unsafe_put_obj(callee, T_BOOLEAN, false); return;
3642 case vmIntrinsics::_putByte : append_unsafe_put_obj(callee, T_BYTE, false); return;
3643 case vmIntrinsics::_putShort : append_unsafe_put_obj(callee, T_SHORT, false); return;
3644 case vmIntrinsics::_putChar : append_unsafe_put_obj(callee, T_CHAR, false); return;
3645 case vmIntrinsics::_putInt : append_unsafe_put_obj(callee, T_INT, false); return;
3646 case vmIntrinsics::_putLong : append_unsafe_put_obj(callee, T_LONG, false); return;
3647 case vmIntrinsics::_putFloat : append_unsafe_put_obj(callee, T_FLOAT, false); return;
3648 case vmIntrinsics::_putDouble : append_unsafe_put_obj(callee, T_DOUBLE, false); return;
3649 case vmIntrinsics::_getShortUnaligned : append_unsafe_get_obj(callee, T_SHORT, false); return;
3650 case vmIntrinsics::_getCharUnaligned : append_unsafe_get_obj(callee, T_CHAR, false); return;
3651 case vmIntrinsics::_getIntUnaligned : append_unsafe_get_obj(callee, T_INT, false); return;
3652 case vmIntrinsics::_getLongUnaligned : append_unsafe_get_obj(callee, T_LONG, false); return;
3653 case vmIntrinsics::_putShortUnaligned : append_unsafe_put_obj(callee, T_SHORT, false); return;
3654 case vmIntrinsics::_putCharUnaligned : append_unsafe_put_obj(callee, T_CHAR, false); return;
3655 case vmIntrinsics::_putIntUnaligned : append_unsafe_put_obj(callee, T_INT, false); return;
3656 case vmIntrinsics::_putLongUnaligned : append_unsafe_put_obj(callee, T_LONG, false); return;
3657 case vmIntrinsics::_getReferenceVolatile : append_unsafe_get_obj(callee, T_OBJECT, true); return;
3658 case vmIntrinsics::_getBooleanVolatile : append_unsafe_get_obj(callee, T_BOOLEAN, true); return;
3659 case vmIntrinsics::_getByteVolatile : append_unsafe_get_obj(callee, T_BYTE, true); return;
3660 case vmIntrinsics::_getShortVolatile : append_unsafe_get_obj(callee, T_SHORT, true); return;
3661 case vmIntrinsics::_getCharVolatile : append_unsafe_get_obj(callee, T_CHAR, true); return;
3662 case vmIntrinsics::_getIntVolatile : append_unsafe_get_obj(callee, T_INT, true); return;
3663 case vmIntrinsics::_getLongVolatile : append_unsafe_get_obj(callee, T_LONG, true); return;
3664 case vmIntrinsics::_getFloatVolatile : append_unsafe_get_obj(callee, T_FLOAT, true); return;
3665 case vmIntrinsics::_getDoubleVolatile : append_unsafe_get_obj(callee, T_DOUBLE, true); return;
3666 case vmIntrinsics::_putReferenceVolatile : append_unsafe_put_obj(callee, T_OBJECT, true); return;
3667 case vmIntrinsics::_putBooleanVolatile : append_unsafe_put_obj(callee, T_BOOLEAN, true); return;
3668 case vmIntrinsics::_putByteVolatile : append_unsafe_put_obj(callee, T_BYTE, true); return;
3669 case vmIntrinsics::_putShortVolatile : append_unsafe_put_obj(callee, T_SHORT, true); return;
3670 case vmIntrinsics::_putCharVolatile : append_unsafe_put_obj(callee, T_CHAR, true); return;
3671 case vmIntrinsics::_putIntVolatile : append_unsafe_put_obj(callee, T_INT, true); return;
3672 case vmIntrinsics::_putLongVolatile : append_unsafe_put_obj(callee, T_LONG, true); return;
3673 case vmIntrinsics::_putFloatVolatile : append_unsafe_put_obj(callee, T_FLOAT, true); return;
3674 case vmIntrinsics::_putDoubleVolatile : append_unsafe_put_obj(callee, T_DOUBLE, true); return;
3675 case vmIntrinsics::_compareAndSetLong:
3676 case vmIntrinsics::_compareAndSetInt:
3677 case vmIntrinsics::_compareAndSetReference : append_unsafe_CAS(callee); return;
3678 case vmIntrinsics::_getAndAddInt:
3679 case vmIntrinsics::_getAndAddLong : append_unsafe_get_and_set_obj(callee, true); return;
3680 case vmIntrinsics::_getAndSetInt :
3681 case vmIntrinsics::_getAndSetLong :
3682 case vmIntrinsics::_getAndSetReference : append_unsafe_get_and_set_obj(callee, false); return;
3683 case vmIntrinsics::_getCharStringU : append_char_access(callee, false); return;
3684 case vmIntrinsics::_putCharStringU : append_char_access(callee, true); return;
3685 default:
3686 break;
3687 }
3688
3689 // create intrinsic node
3690 const bool has_receiver = !callee->is_static();
3691 ValueType* result_type = as_ValueType(callee->return_type());
3692 ValueStack* state_before = copy_state_for_exception();
3693
3694 Values* args = state()->pop_arguments(callee->arg_size());
3695
3696 if (is_profiling()) {
3697 // Don't profile in the special case where the root method
3698 // is the intrinsic
3699 if (callee != method()) {
3700 // Note that we'd collect profile data in this method if we wanted it.
3701 compilation()->set_would_profile(true);
3702 if (profile_calls()) {
3703 Value recv = NULL;
3704 if (has_receiver) {
3705 recv = args->at(0);
3706 null_check(recv);
3707 }
3708 profile_call(callee, recv, NULL, collect_args_for_profiling(args, callee, true), true);
3709 }
3710 }
3711 }
3712
3713 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(),
3714 args, has_receiver, state_before,
3715 vmIntrinsics::preserves_state(id),
3716 vmIntrinsics::can_trap(id));
3717 // append instruction & push result
3718 Value value = append_split(result);
3719 if (result_type != voidType && !ignore_return) {
3720 push(result_type, value);
3721 }
3722
3723 if (callee != method() && profile_return() && result_type->is_object_kind()) {
3724 profile_return_type(result, callee);
3725 }
3726 }
3727
3728 bool GraphBuilder::try_inline_intrinsics(ciMethod* callee, bool ignore_return) {
3729 // For calling is_intrinsic_available we need to transition to
3730 // the '_thread_in_vm' state because is_intrinsic_available()
3731 // accesses critical VM-internal data.
3732 bool is_available = false;
3733 {
3734 VM_ENTRY_MARK;
3735 methodHandle mh(THREAD, callee->get_Method());
3736 is_available = _compilation->compiler()->is_intrinsic_available(mh, _compilation->directive());
3737 }
3738
3739 if (!is_available) {
3740 if (!InlineNatives) {
3741 // Return false and also set message that the inlining of
3742 // intrinsics has been disabled in general.
3743 INLINE_BAILOUT("intrinsic method inlining disabled");
3744 } else {
3745 return false;
3746 }
3747 }
3748 build_graph_for_intrinsic(callee, ignore_return);
3749 return true;
3750 }
3751
3752
3753 bool GraphBuilder::try_inline_jsr(int jsr_dest_bci) {
3754 // Introduce a new callee continuation point - all Ret instructions
3755 // will be replaced with Gotos to this point.
3756 BlockBegin* cont = block_at(next_bci());
3757 assert(cont != NULL, "continuation must exist (BlockListBuilder starts a new block after a jsr");
3758
3759 // Note: can not assign state to continuation yet, as we have to
3760 // pick up the state from the Ret instructions.
3761
3762 // Push callee scope
3763 push_scope_for_jsr(cont, jsr_dest_bci);
3764
3765 // Temporarily set up bytecode stream so we can append instructions
3766 // (only using the bci of this stream)
3767 scope_data()->set_stream(scope_data()->parent()->stream());
3768
3769 BlockBegin* jsr_start_block = block_at(jsr_dest_bci);
3770 assert(jsr_start_block != NULL, "jsr start block must exist");
3771 assert(!jsr_start_block->is_set(BlockBegin::was_visited_flag), "should not have visited jsr yet");
3772 Goto* goto_sub = new Goto(jsr_start_block, false);
3773 // Must copy state to avoid wrong sharing when parsing bytecodes
3774 assert(jsr_start_block->state() == NULL, "should have fresh jsr starting block");
3775 jsr_start_block->set_state(copy_state_before_with_bci(jsr_dest_bci));
3776 append(goto_sub);
3777 _block->set_end(goto_sub);
3778 _last = _block = jsr_start_block;
3779
3780 // Clear out bytecode stream
3781 scope_data()->set_stream(NULL);
3782
3783 scope_data()->add_to_work_list(jsr_start_block);
3784
3785 // Ready to resume parsing in subroutine
3786 iterate_all_blocks();
3787
3788 // If we bailed out during parsing, return immediately (this is bad news)
3789 CHECK_BAILOUT_(false);
3790
3791 // Detect whether the continuation can actually be reached. If not,
3792 // it has not had state set by the join() operations in
3793 // iterate_bytecodes_for_block()/ret() and we should not touch the
3794 // iteration state. The calling activation of
3795 // iterate_bytecodes_for_block will then complete normally.
3796 if (cont->state() != NULL) {
3797 if (!cont->is_set(BlockBegin::was_visited_flag)) {
3798 // add continuation to work list instead of parsing it immediately
3799 scope_data()->parent()->add_to_work_list(cont);
3800 }
3801 }
3802
3803 assert(jsr_continuation() == cont, "continuation must not have changed");
3804 assert(!jsr_continuation()->is_set(BlockBegin::was_visited_flag) ||
3805 jsr_continuation()->is_set(BlockBegin::parser_loop_header_flag),
3806 "continuation can only be visited in case of backward branches");
3807 assert(_last && _last->as_BlockEnd(), "block must have end");
3808
3809 // continuation is in work list, so end iteration of current block
3810 _skip_block = true;
3811 pop_scope_for_jsr();
3812
3813 return true;
3814 }
3815
3816
3817 // Inline the entry of a synchronized method as a monitor enter and
3818 // register the exception handler which releases the monitor if an
3819 // exception is thrown within the callee. Note that the monitor enter
3820 // cannot throw an exception itself, because the receiver is
3821 // guaranteed to be non-null by the explicit null check at the
3822 // beginning of inlining.
3823 void GraphBuilder::inline_sync_entry(Value lock, BlockBegin* sync_handler) {
3824 assert(lock != NULL && sync_handler != NULL, "lock or handler missing");
3825
3826 monitorenter(lock, SynchronizationEntryBCI);
3827 assert(_last->as_MonitorEnter() != NULL, "monitor enter expected");
3828 _last->set_needs_null_check(false);
3829
3830 sync_handler->set(BlockBegin::exception_entry_flag);
3831 sync_handler->set(BlockBegin::is_on_work_list_flag);
3832
3833 ciExceptionHandler* desc = new ciExceptionHandler(method()->holder(), 0, method()->code_size(), -1, 0);
3834 XHandler* h = new XHandler(desc);
3835 h->set_entry_block(sync_handler);
3836 scope_data()->xhandlers()->append(h);
3837 scope_data()->set_has_handler();
3838 }
3839
3840
3841 // If an exception is thrown and not handled within an inlined
3842 // synchronized method, the monitor must be released before the
3843 // exception is rethrown in the outer scope. Generate the appropriate
3844 // instructions here.
3845 void GraphBuilder::fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler) {
3846 BlockBegin* orig_block = _block;
3847 ValueStack* orig_state = _state;
3848 Instruction* orig_last = _last;
3849 _last = _block = sync_handler;
3850 _state = sync_handler->state()->copy();
3851
3852 assert(sync_handler != NULL, "handler missing");
3853 assert(!sync_handler->is_set(BlockBegin::was_visited_flag), "is visited here");
3854
3855 assert(lock != NULL || default_handler, "lock or handler missing");
3856
3857 XHandler* h = scope_data()->xhandlers()->remove_last();
3858 assert(h->entry_block() == sync_handler, "corrupt list of handlers");
3859
3860 block()->set(BlockBegin::was_visited_flag);
3861 Value exception = append_with_bci(new ExceptionObject(), SynchronizationEntryBCI);
3862 assert(exception->is_pinned(), "must be");
3863
3864 int bci = SynchronizationEntryBCI;
3865 if (compilation()->env()->dtrace_method_probes()) {
3866 // Report exit from inline methods. We don't have a stream here
3867 // so pass an explicit bci of SynchronizationEntryBCI.
3868 Values* args = new Values(1);
3869 args->push(append_with_bci(new Constant(new MethodConstant(method())), bci));
3870 append_with_bci(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args), bci);
3871 }
3872
3873 if (lock) {
3874 assert(state()->locks_size() > 0 && state()->lock_at(state()->locks_size() - 1) == lock, "lock is missing");
3875 if (!lock->is_linked()) {
3876 lock = append_with_bci(lock, bci);
3877 }
3878
3879 // exit the monitor in the context of the synchronized method
3880 monitorexit(lock, bci);
3881
3882 // exit the context of the synchronized method
3883 if (!default_handler) {
3884 pop_scope();
3885 bci = _state->caller_state()->bci();
3886 _state = _state->caller_state()->copy_for_parsing();
3887 }
3888 }
3889
3890 // perform the throw as if at the the call site
3891 apush(exception);
3892 throw_op(bci);
3893
3894 BlockEnd* end = last()->as_BlockEnd();
3895 block()->set_end(end);
3896
3897 _block = orig_block;
3898 _state = orig_state;
3899 _last = orig_last;
3900 }
3901
3902
3903 bool GraphBuilder::try_inline_full(ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc, Value receiver) {
3904 assert(!callee->is_native(), "callee must not be native");
3905 if (CompilationPolicy::policy()->should_not_inline(compilation()->env(), callee)) {
3906 INLINE_BAILOUT("inlining prohibited by policy");
3907 }
3908 // first perform tests of things it's not possible to inline
3909 if (callee->has_exception_handlers() &&
3910 !InlineMethodsWithExceptionHandlers) INLINE_BAILOUT("callee has exception handlers");
3911 if (callee->is_synchronized() &&
3912 !InlineSynchronizedMethods ) INLINE_BAILOUT("callee is synchronized");
3913 if (!callee->holder()->is_initialized()) INLINE_BAILOUT("callee's klass not initialized yet");
3914 if (!callee->has_balanced_monitors()) INLINE_BAILOUT("callee's monitors do not match");
3915
3916 // Proper inlining of methods with jsrs requires a little more work.
3917 if (callee->has_jsrs() ) INLINE_BAILOUT("jsrs not handled properly by inliner yet");
3918
3919 // When SSE2 is used on intel, then no special handling is needed
3920 // for strictfp because the enum-constant is fixed at compile time,
3921 // the check for UseSSE2 is needed here
3922 if (strict_fp_requires_explicit_rounding && UseSSE < 2 && method()->is_strict() != callee->is_strict()) {
3923 INLINE_BAILOUT("caller and callee have different strict fp requirements");
3924 }
3925
3926 if (is_profiling() && !callee->ensure_method_data()) {
3927 INLINE_BAILOUT("mdo allocation failed");
3928 }
3929
3930 // now perform tests that are based on flag settings
3931 bool inlinee_by_directive = compilation()->directive()->should_inline(callee);
3932 if (callee->force_inline() || inlinee_by_directive) {
3933 if (inline_level() > MaxForceInlineLevel ) INLINE_BAILOUT("MaxForceInlineLevel");
3934 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep");
3935
3936 const char* msg = "";
3937 if (callee->force_inline()) msg = "force inline by annotation";
3938 if (inlinee_by_directive) msg = "force inline by CompileCommand";
3939 print_inlining(callee, msg);
3940 } else {
3941 // use heuristic controls on inlining
3942 if (inline_level() > MaxInlineLevel ) INLINE_BAILOUT("inlining too deep");
3943 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep");
3944 if (callee->code_size_for_inlining() > max_inline_size() ) INLINE_BAILOUT("callee is too large");
3945
3946 // don't inline throwable methods unless the inlining tree is rooted in a throwable class
3947 if (callee->name() == ciSymbol::object_initializer_name() &&
3948 callee->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
3949 // Throwable constructor call
3950 IRScope* top = scope();
3951 while (top->caller() != NULL) {
3952 top = top->caller();
3953 }
3954 if (!top->method()->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
3955 INLINE_BAILOUT("don't inline Throwable constructors");
3956 }
3957 }
3958
3959 if (compilation()->env()->num_inlined_bytecodes() > DesiredMethodLimit) {
3960 INLINE_BAILOUT("total inlining greater than DesiredMethodLimit");
3961 }
3962 // printing
3963 print_inlining(callee);
3964 }
3965
3966 // NOTE: Bailouts from this point on, which occur at the
3967 // GraphBuilder level, do not cause bailout just of the inlining but
3968 // in fact of the entire compilation.
3969
3970 BlockBegin* orig_block = block();
3971
3972 const bool is_invokedynamic = bc == Bytecodes::_invokedynamic;
3973 const bool has_receiver = (bc != Bytecodes::_invokestatic && !is_invokedynamic);
3974
3975 const int args_base = state()->stack_size() - callee->arg_size();
3976 assert(args_base >= 0, "stack underflow during inlining");
3977
3978 // Insert null check if necessary
3979 Value recv = NULL;
3980 if (has_receiver) {
3981 // note: null check must happen even if first instruction of callee does
3982 // an implicit null check since the callee is in a different scope
3983 // and we must make sure exception handling does the right thing
3984 assert(!callee->is_static(), "callee must not be static");
3985 assert(callee->arg_size() > 0, "must have at least a receiver");
3986 recv = state()->stack_at(args_base);
3987 null_check(recv);
3988 }
3989
3990 if (is_profiling()) {
3991 // Note that we'd collect profile data in this method if we wanted it.
3992 // this may be redundant here...
3993 compilation()->set_would_profile(true);
3994
3995 if (profile_calls()) {
3996 int start = 0;
3997 Values* obj_args = args_list_for_profiling(callee, start, has_receiver);
3998 if (obj_args != NULL) {
3999 int s = obj_args->max_length();
4000 // if called through method handle invoke, some arguments may have been popped
4001 for (int i = args_base+start, j = 0; j < obj_args->max_length() && i < state()->stack_size(); ) {
4002 Value v = state()->stack_at_inc(i);
4003 if (v->type()->is_object_kind()) {
4004 obj_args->push(v);
4005 j++;
4006 }
4007 }
4008 check_args_for_profiling(obj_args, s);
4009 }
4010 profile_call(callee, recv, holder_known ? callee->holder() : NULL, obj_args, true);
4011 }
4012 }
4013
4014 // Introduce a new callee continuation point - if the callee has
4015 // more than one return instruction or the return does not allow
4016 // fall-through of control flow, all return instructions of the
4017 // callee will need to be replaced by Goto's pointing to this
4018 // continuation point.
4019 BlockBegin* cont = block_at(next_bci());
4020 bool continuation_existed = true;
4021 if (cont == NULL) {
4022 cont = new BlockBegin(next_bci());
4023 // low number so that continuation gets parsed as early as possible
4024 cont->set_depth_first_number(0);
4025 if (PrintInitialBlockList) {
4026 tty->print_cr("CFG: created block %d (bci %d) as continuation for inline at bci %d",
4027 cont->block_id(), cont->bci(), bci());
4028 }
4029 continuation_existed = false;
4030 }
4031 // Record number of predecessors of continuation block before
4032 // inlining, to detect if inlined method has edges to its
4033 // continuation after inlining.
4034 int continuation_preds = cont->number_of_preds();
4035
4036 // Push callee scope
4037 push_scope(callee, cont);
4038
4039 // the BlockListBuilder for the callee could have bailed out
4040 if (bailed_out())
4041 return false;
4042
4043 // Temporarily set up bytecode stream so we can append instructions
4044 // (only using the bci of this stream)
4045 scope_data()->set_stream(scope_data()->parent()->stream());
4046
4047 // Pass parameters into callee state: add assignments
4048 // note: this will also ensure that all arguments are computed before being passed
4049 ValueStack* callee_state = state();
4050 ValueStack* caller_state = state()->caller_state();
4051 for (int i = args_base; i < caller_state->stack_size(); ) {
4052 const int arg_no = i - args_base;
4053 Value arg = caller_state->stack_at_inc(i);
4054 store_local(callee_state, arg, arg_no);
4055 }
4056
4057 // Remove args from stack.
4058 // Note that we preserve locals state in case we can use it later
4059 // (see use of pop_scope() below)
4060 caller_state->truncate_stack(args_base);
4061 assert(callee_state->stack_size() == 0, "callee stack must be empty");
4062
4063 Value lock = NULL;
4064 BlockBegin* sync_handler = NULL;
4065
4066 // Inline the locking of the receiver if the callee is synchronized
4067 if (callee->is_synchronized()) {
4068 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror())))
4069 : state()->local_at(0);
4070 sync_handler = new BlockBegin(SynchronizationEntryBCI);
4071 inline_sync_entry(lock, sync_handler);
4072 }
4073
4074 if (compilation()->env()->dtrace_method_probes()) {
4075 Values* args = new Values(1);
4076 args->push(append(new Constant(new MethodConstant(method()))));
4077 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args));
4078 }
4079
4080 if (profile_inlined_calls()) {
4081 profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI));
4082 }
4083
4084 BlockBegin* callee_start_block = block_at(0);
4085 if (callee_start_block != NULL) {
4086 assert(callee_start_block->is_set(BlockBegin::parser_loop_header_flag), "must be loop header");
4087 Goto* goto_callee = new Goto(callee_start_block, false);
4088 // The state for this goto is in the scope of the callee, so use
4089 // the entry bci for the callee instead of the call site bci.
4090 append_with_bci(goto_callee, 0);
4091 _block->set_end(goto_callee);
4092 callee_start_block->merge(callee_state);
4093
4094 _last = _block = callee_start_block;
4095
4096 scope_data()->add_to_work_list(callee_start_block);
4097 }
4098
4099 // Clear out bytecode stream
4100 scope_data()->set_stream(NULL);
4101 scope_data()->set_ignore_return(ignore_return);
4102
4103 CompileLog* log = compilation()->log();
4104 if (log != NULL) log->head("parse method='%d'", log->identify(callee));
4105
4106 // Ready to resume parsing in callee (either in the same block we
4107 // were in before or in the callee's start block)
4108 iterate_all_blocks(callee_start_block == NULL);
4109
4110 if (log != NULL) log->done("parse");
4111
4112 // If we bailed out during parsing, return immediately (this is bad news)
4113 if (bailed_out())
4114 return false;
4115
4116 // iterate_all_blocks theoretically traverses in random order; in
4117 // practice, we have only traversed the continuation if we are
4118 // inlining into a subroutine
4119 assert(continuation_existed ||
4120 !continuation()->is_set(BlockBegin::was_visited_flag),
4121 "continuation should not have been parsed yet if we created it");
4122
4123 // At this point we are almost ready to return and resume parsing of
4124 // the caller back in the GraphBuilder. The only thing we want to do
4125 // first is an optimization: during parsing of the callee we
4126 // generated at least one Goto to the continuation block. If we
4127 // generated exactly one, and if the inlined method spanned exactly
4128 // one block (and we didn't have to Goto its entry), then we snip
4129 // off the Goto to the continuation, allowing control to fall
4130 // through back into the caller block and effectively performing
4131 // block merging. This allows load elimination and CSE to take place
4132 // across multiple callee scopes if they are relatively simple, and
4133 // is currently essential to making inlining profitable.
4134 if (num_returns() == 1
4135 && block() == orig_block
4136 && block() == inline_cleanup_block()) {
4137 _last = inline_cleanup_return_prev();
4138 _state = inline_cleanup_state();
4139 } else if (continuation_preds == cont->number_of_preds()) {
4140 // Inlining caused that the instructions after the invoke in the
4141 // caller are not reachable any more. So skip filling this block
4142 // with instructions!
4143 assert(cont == continuation(), "");
4144 assert(_last && _last->as_BlockEnd(), "");
4145 _skip_block = true;
4146 } else {
4147 // Resume parsing in continuation block unless it was already parsed.
4148 // Note that if we don't change _last here, iteration in
4149 // iterate_bytecodes_for_block will stop when we return.
4150 if (!continuation()->is_set(BlockBegin::was_visited_flag)) {
4151 // add continuation to work list instead of parsing it immediately
4152 assert(_last && _last->as_BlockEnd(), "");
4153 scope_data()->parent()->add_to_work_list(continuation());
4154 _skip_block = true;
4155 }
4156 }
4157
4158 // Fill the exception handler for synchronized methods with instructions
4159 if (callee->is_synchronized() && sync_handler->state() != NULL) {
4160 fill_sync_handler(lock, sync_handler);
4161 } else {
4162 pop_scope();
4163 }
4164
4165 compilation()->notice_inlined_method(callee);
4166
4167 return true;
4168 }
4169
4170
4171 bool GraphBuilder::try_method_handle_inline(ciMethod* callee, bool ignore_return) {
4172 ValueStack* state_before = copy_state_before();
4173 vmIntrinsics::ID iid = callee->intrinsic_id();
4174 switch (iid) {
4175 case vmIntrinsics::_invokeBasic:
4176 {
4177 // get MethodHandle receiver
4178 const int args_base = state()->stack_size() - callee->arg_size();
4179 ValueType* type = state()->stack_at(args_base)->type();
4180 if (type->is_constant()) {
4181 ciMethod* target = type->as_ObjectType()->constant_value()->as_method_handle()->get_vmtarget();
4182 // We don't do CHA here so only inline static and statically bindable methods.
4183 if (target->is_static() || target->can_be_statically_bound()) {
4184 if (ciMethod::is_consistent_info(callee, target)) {
4185 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual;
4186 ignore_return = ignore_return || (callee->return_type()->is_void() && !target->return_type()->is_void());
4187 if (try_inline(target, /*holder_known*/ true, ignore_return, bc)) {
4188 return true;
4189 }
4190 } else {
4191 print_inlining(target, "signatures mismatch", /*success*/ false);
4192 }
4193 } else {
4194 print_inlining(target, "not static or statically bindable", /*success*/ false);
4195 }
4196 } else {
4197 print_inlining(callee, "receiver not constant", /*success*/ false);
4198 }
4199 }
4200 break;
4201
4202 case vmIntrinsics::_linkToVirtual:
4203 case vmIntrinsics::_linkToStatic:
4204 case vmIntrinsics::_linkToSpecial:
4205 case vmIntrinsics::_linkToInterface:
4206 {
4207 // pop MemberName argument
4208 const int args_base = state()->stack_size() - callee->arg_size();
4209 ValueType* type = apop()->type();
4210 if (type->is_constant()) {
4211 ciMethod* target = type->as_ObjectType()->constant_value()->as_member_name()->get_vmtarget();
4212 ignore_return = ignore_return || (callee->return_type()->is_void() && !target->return_type()->is_void());
4213 // If the target is another method handle invoke, try to recursively get
4214 // a better target.
4215 if (target->is_method_handle_intrinsic()) {
4216 if (try_method_handle_inline(target, ignore_return)) {
4217 return true;
4218 }
4219 } else if (!ciMethod::is_consistent_info(callee, target)) {
4220 print_inlining(target, "signatures mismatch", /*success*/ false);
4221 } else {
4222 ciSignature* signature = target->signature();
4223 const int receiver_skip = target->is_static() ? 0 : 1;
4224 // Cast receiver to its type.
4225 if (!target->is_static()) {
4226 ciKlass* tk = signature->accessing_klass();
4227 Value obj = state()->stack_at(args_base);
4228 if (obj->exact_type() == NULL &&
4229 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) {
4230 TypeCast* c = new TypeCast(tk, obj, state_before);
4231 append(c);
4232 state()->stack_at_put(args_base, c);
4233 }
4234 }
4235 // Cast reference arguments to its type.
4236 for (int i = 0, j = 0; i < signature->count(); i++) {
4237 ciType* t = signature->type_at(i);
4238 if (t->is_klass()) {
4239 ciKlass* tk = t->as_klass();
4240 Value obj = state()->stack_at(args_base + receiver_skip + j);
4241 if (obj->exact_type() == NULL &&
4242 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) {
4243 TypeCast* c = new TypeCast(t, obj, state_before);
4244 append(c);
4245 state()->stack_at_put(args_base + receiver_skip + j, c);
4246 }
4247 }
4248 j += t->size(); // long and double take two slots
4249 }
4250 // We don't do CHA here so only inline static and statically bindable methods.
4251 if (target->is_static() || target->can_be_statically_bound()) {
4252 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual;
4253 if (try_inline(target, /*holder_known*/ true, ignore_return, bc)) {
4254 return true;
4255 }
4256 } else {
4257 print_inlining(target, "not static or statically bindable", /*success*/ false);
4258 }
4259 }
4260 } else {
4261 print_inlining(callee, "MemberName not constant", /*success*/ false);
4262 }
4263 }
4264 break;
4265
4266 default:
4267 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
4268 break;
4269 }
4270 set_state(state_before->copy_for_parsing());
4271 return false;
4272 }
4273
4274
4275 void GraphBuilder::inline_bailout(const char* msg) {
4276 assert(msg != NULL, "inline bailout msg must exist");
4277 _inline_bailout_msg = msg;
4278 }
4279
4280
4281 void GraphBuilder::clear_inline_bailout() {
4282 _inline_bailout_msg = NULL;
4283 }
4284
4285
4286 void GraphBuilder::push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start) {
4287 ScopeData* data = new ScopeData(NULL);
4288 data->set_scope(scope);
4289 data->set_bci2block(bci2block);
4290 _scope_data = data;
4291 _block = start;
4292 }
4293
4294
4295 void GraphBuilder::push_scope(ciMethod* callee, BlockBegin* continuation) {
4296 IRScope* callee_scope = new IRScope(compilation(), scope(), bci(), callee, -1, false);
4297 scope()->add_callee(callee_scope);
4298
4299 BlockListBuilder blb(compilation(), callee_scope, -1);
4300 CHECK_BAILOUT();
4301
4302 if (!blb.bci2block()->at(0)->is_set(BlockBegin::parser_loop_header_flag)) {
4303 // this scope can be inlined directly into the caller so remove
4304 // the block at bci 0.
4305 blb.bci2block()->at_put(0, NULL);
4306 }
4307
4308 set_state(new ValueStack(callee_scope, state()->copy(ValueStack::CallerState, bci())));
4309
4310 ScopeData* data = new ScopeData(scope_data());
4311 data->set_scope(callee_scope);
4312 data->set_bci2block(blb.bci2block());
4313 data->set_continuation(continuation);
4314 _scope_data = data;
4315 }
4316
4317
4318 void GraphBuilder::push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci) {
4319 ScopeData* data = new ScopeData(scope_data());
4320 data->set_parsing_jsr();
4321 data->set_jsr_entry_bci(jsr_dest_bci);
4322 data->set_jsr_return_address_local(-1);
4323 // Must clone bci2block list as we will be mutating it in order to
4324 // properly clone all blocks in jsr region as well as exception
4325 // handlers containing rets
4326 BlockList* new_bci2block = new BlockList(bci2block()->length());
4327 new_bci2block->appendAll(bci2block());
4328 data->set_bci2block(new_bci2block);
4329 data->set_scope(scope());
4330 data->setup_jsr_xhandlers();
4331 data->set_continuation(continuation());
4332 data->set_jsr_continuation(jsr_continuation);
4333 _scope_data = data;
4334 }
4335
4336
4337 void GraphBuilder::pop_scope() {
4338 int number_of_locks = scope()->number_of_locks();
4339 _scope_data = scope_data()->parent();
4340 // accumulate minimum number of monitor slots to be reserved
4341 scope()->set_min_number_of_locks(number_of_locks);
4342 }
4343
4344
4345 void GraphBuilder::pop_scope_for_jsr() {
4346 _scope_data = scope_data()->parent();
4347 }
4348
4349 void GraphBuilder::append_unsafe_get_obj(ciMethod* callee, BasicType t, bool is_volatile) {
4350 Values* args = state()->pop_arguments(callee->arg_size());
4351 null_check(args->at(0));
4352 Instruction* offset = args->at(2);
4353 #ifndef _LP64
4354 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4355 #endif
4356 Instruction* op = append(new UnsafeGetObject(t, args->at(1), offset, is_volatile));
4357 push(op->type(), op);
4358 compilation()->set_has_unsafe_access(true);
4359 }
4360
4361
4362 void GraphBuilder::append_unsafe_put_obj(ciMethod* callee, BasicType t, bool is_volatile) {
4363 Values* args = state()->pop_arguments(callee->arg_size());
4364 null_check(args->at(0));
4365 Instruction* offset = args->at(2);
4366 #ifndef _LP64
4367 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4368 #endif
4369 Value val = args->at(3);
4370 if (t == T_BOOLEAN) {
4371 Value mask = append(new Constant(new IntConstant(1)));
4372 val = append(new LogicOp(Bytecodes::_iand, val, mask));
4373 }
4374 Instruction* op = append(new UnsafePutObject(t, args->at(1), offset, val, is_volatile));
4375 compilation()->set_has_unsafe_access(true);
4376 kill_all();
4377 }
4378
4379
4380 void GraphBuilder::append_unsafe_get_raw(ciMethod* callee, BasicType t) {
4381 Values* args = state()->pop_arguments(callee->arg_size());
4382 null_check(args->at(0));
4383 Instruction* op = append(new UnsafeGetRaw(t, args->at(1), false));
4384 push(op->type(), op);
4385 compilation()->set_has_unsafe_access(true);
4386 }
4387
4388
4389 void GraphBuilder::append_unsafe_put_raw(ciMethod* callee, BasicType t) {
4390 Values* args = state()->pop_arguments(callee->arg_size());
4391 null_check(args->at(0));
4392 Instruction* op = append(new UnsafePutRaw(t, args->at(1), args->at(2)));
4393 compilation()->set_has_unsafe_access(true);
4394 }
4395
4396
4397 void GraphBuilder::append_unsafe_CAS(ciMethod* callee) {
4398 ValueStack* state_before = copy_state_for_exception();
4399 ValueType* result_type = as_ValueType(callee->return_type());
4400 assert(result_type->is_int(), "int result");
4401 Values* args = state()->pop_arguments(callee->arg_size());
4402
4403 // Pop off some args to specially handle, then push back
4404 Value newval = args->pop();
4405 Value cmpval = args->pop();
4406 Value offset = args->pop();
4407 Value src = args->pop();
4408 Value unsafe_obj = args->pop();
4409
4410 // Separately handle the unsafe arg. It is not needed for code
4411 // generation, but must be null checked
4412 null_check(unsafe_obj);
4413
4414 #ifndef _LP64
4415 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4416 #endif
4417
4418 args->push(src);
4419 args->push(offset);
4420 args->push(cmpval);
4421 args->push(newval);
4422
4423 // An unsafe CAS can alias with other field accesses, but we don't
4424 // know which ones so mark the state as no preserved. This will
4425 // cause CSE to invalidate memory across it.
4426 bool preserves_state = false;
4427 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), args, false, state_before, preserves_state);
4428 append_split(result);
4429 push(result_type, result);
4430 compilation()->set_has_unsafe_access(true);
4431 }
4432
4433 void GraphBuilder::append_char_access(ciMethod* callee, bool is_store) {
4434 // This intrinsic accesses byte[] array as char[] array. Computing the offsets
4435 // correctly requires matched array shapes.
4436 assert (arrayOopDesc::base_offset_in_bytes(T_CHAR) == arrayOopDesc::base_offset_in_bytes(T_BYTE),
4437 "sanity: byte[] and char[] bases agree");
4438 assert (type2aelembytes(T_CHAR) == type2aelembytes(T_BYTE)*2,
4439 "sanity: byte[] and char[] scales agree");
4440
4441 ValueStack* state_before = copy_state_indexed_access();
4442 compilation()->set_has_access_indexed(true);
4443 Values* args = state()->pop_arguments(callee->arg_size());
4444 Value array = args->at(0);
4445 Value index = args->at(1);
4446 if (is_store) {
4447 Value value = args->at(2);
4448 Instruction* store = append(new StoreIndexed(array, index, NULL, T_CHAR, value, state_before, false, true));
4449 store->set_flag(Instruction::NeedsRangeCheckFlag, false);
4450 _memory->store_value(value);
4451 } else {
4452 Instruction* load = append(new LoadIndexed(array, index, NULL, T_CHAR, state_before, true));
4453 load->set_flag(Instruction::NeedsRangeCheckFlag, false);
4454 push(load->type(), load);
4455 }
4456 }
4457
4458 static void post_inlining_event(EventCompilerInlining* event,
4459 int compile_id,
4460 const char* msg,
4461 bool success,
4462 int bci,
4463 ciMethod* caller,
4464 ciMethod* callee) {
4465 assert(caller != NULL, "invariant");
4466 assert(callee != NULL, "invariant");
4467 assert(event != NULL, "invariant");
4468 assert(event->should_commit(), "invariant");
4469 JfrStructCalleeMethod callee_struct;
4470 callee_struct.set_type(callee->holder()->name()->as_utf8());
4471 callee_struct.set_name(callee->name()->as_utf8());
4472 callee_struct.set_descriptor(callee->signature()->as_symbol()->as_utf8());
4473 event->set_compileId(compile_id);
4474 event->set_message(msg);
4475 event->set_succeeded(success);
4476 event->set_bci(bci);
4477 event->set_caller(caller->get_Method());
4478 event->set_callee(callee_struct);
4479 event->commit();
4480 }
4481
4482 void GraphBuilder::print_inlining(ciMethod* callee, const char* msg, bool success) {
4483 CompileLog* log = compilation()->log();
4484 if (log != NULL) {
4485 if (success) {
4486 if (msg != NULL)
4487 log->inline_success(msg);
4488 else
4489 log->inline_success("receiver is statically known");
4490 } else {
4491 if (msg != NULL)
4492 log->inline_fail(msg);
4493 else
4494 log->inline_fail("reason unknown");
4495 }
4496 }
4497 EventCompilerInlining event;
4498 if (event.should_commit()) {
4499 post_inlining_event(&event, compilation()->env()->task()->compile_id(), msg, success, bci(), method(), callee);
4500 }
4501
4502 CompileTask::print_inlining_ul(callee, scope()->level(), bci(), msg);
4503
4504 if (!compilation()->directive()->PrintInliningOption) {
4505 return;
4506 }
4507 CompileTask::print_inlining_tty(callee, scope()->level(), bci(), msg);
4508 if (success && CIPrintMethodCodes) {
4509 callee->print_codes();
4510 }
4511 }
4512
4513 void GraphBuilder::append_unsafe_get_and_set_obj(ciMethod* callee, bool is_add) {
4514 Values* args = state()->pop_arguments(callee->arg_size());
4515 BasicType t = callee->return_type()->basic_type();
4516 null_check(args->at(0));
4517 Instruction* offset = args->at(2);
4518 #ifndef _LP64
4519 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4520 #endif
4521 Instruction* op = append(new UnsafeGetAndSetObject(t, args->at(1), offset, args->at(3), is_add));
4522 compilation()->set_has_unsafe_access(true);
4523 kill_all();
4524 push(op->type(), op);
4525 }
4526
4527 #ifndef PRODUCT
4528 void GraphBuilder::print_stats() {
4529 vmap()->print();
4530 }
4531 #endif // PRODUCT
4532
4533 void GraphBuilder::profile_call(ciMethod* callee, Value recv, ciKlass* known_holder, Values* obj_args, bool inlined) {
4534 assert(known_holder == NULL || (known_holder->is_instance_klass() &&
4535 (!known_holder->is_interface() ||
4536 ((ciInstanceKlass*)known_holder)->has_nonstatic_concrete_methods())), "should be non-static concrete method");
4537 if (known_holder != NULL) {
4538 if (known_holder->exact_klass() == NULL) {
4539 known_holder = compilation()->cha_exact_type(known_holder);
4540 }
4541 }
4542
4543 append(new ProfileCall(method(), bci(), callee, recv, known_holder, obj_args, inlined));
4544 }
4545
4546 void GraphBuilder::profile_return_type(Value ret, ciMethod* callee, ciMethod* m, int invoke_bci) {
4547 assert((m == NULL) == (invoke_bci < 0), "invalid method and invalid bci together");
4548 if (m == NULL) {
4549 m = method();
4550 }
4551 if (invoke_bci < 0) {
4552 invoke_bci = bci();
4553 }
4554 ciMethodData* md = m->method_data_or_null();
4555 ciProfileData* data = md->bci_to_data(invoke_bci);
4556 if (data != NULL && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) {
4557 bool has_return = data->is_CallTypeData() ? ((ciCallTypeData*)data)->has_return() : ((ciVirtualCallTypeData*)data)->has_return();
4558 if (has_return) {
4559 append(new ProfileReturnType(m , invoke_bci, callee, ret));
4560 }
4561 }
4562 }
4563
4564 void GraphBuilder::profile_invocation(ciMethod* callee, ValueStack* state) {
4565 append(new ProfileInvoke(callee, state));
4566 }