Sat, 24 Oct 2020 16:43:47 +0800
Merge
1 /*
2 * Copyright (c) 1999, 2016, 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 */
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 "compiler/compileBroker.hpp"
36 #include "interpreter/bytecode.hpp"
37 #include "jfr/jfrEvents.hpp"
38 #include "runtime/sharedRuntime.hpp"
39 #include "runtime/compilationPolicy.hpp"
40 #include "utilities/bitMap.inline.hpp"
42 class BlockListBuilder VALUE_OBJ_CLASS_SPEC {
43 private:
44 Compilation* _compilation;
45 IRScope* _scope;
47 BlockList _blocks; // internal list of all blocks
48 BlockList* _bci2block; // mapping from bci to blocks for GraphBuilder
50 // fields used by mark_loops
51 BitMap _active; // for iteration of control flow graph
52 BitMap _visited; // for iteration of control flow graph
53 intArray _loop_map; // caches the information if a block is contained in a loop
54 int _next_loop_index; // next free loop number
55 int _next_block_number; // for reverse postorder numbering of blocks
57 // accessors
58 Compilation* compilation() const { return _compilation; }
59 IRScope* scope() const { return _scope; }
60 ciMethod* method() const { return scope()->method(); }
61 XHandlers* xhandlers() const { return scope()->xhandlers(); }
63 // unified bailout support
64 void bailout(const char* msg) const { compilation()->bailout(msg); }
65 bool bailed_out() const { return compilation()->bailed_out(); }
67 // helper functions
68 BlockBegin* make_block_at(int bci, BlockBegin* predecessor);
69 void handle_exceptions(BlockBegin* current, int cur_bci);
70 void handle_jsr(BlockBegin* current, int sr_bci, int next_bci);
71 void store_one(BlockBegin* current, int local);
72 void store_two(BlockBegin* current, int local);
73 void set_entries(int osr_bci);
74 void set_leaders();
76 void make_loop_header(BlockBegin* block);
77 void mark_loops();
78 int mark_loops(BlockBegin* b, bool in_subroutine);
80 // debugging
81 #ifndef PRODUCT
82 void print();
83 #endif
85 public:
86 // creation
87 BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci);
89 // accessors for GraphBuilder
90 BlockList* bci2block() const { return _bci2block; }
91 };
94 // Implementation of BlockListBuilder
96 BlockListBuilder::BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci)
97 : _compilation(compilation)
98 , _scope(scope)
99 , _blocks(16)
100 , _bci2block(new BlockList(scope->method()->code_size(), NULL))
101 , _next_block_number(0)
102 , _active() // size not known yet
103 , _visited() // size not known yet
104 , _next_loop_index(0)
105 , _loop_map() // size not known yet
106 {
107 set_entries(osr_bci);
108 set_leaders();
109 CHECK_BAILOUT();
111 mark_loops();
112 NOT_PRODUCT(if (PrintInitialBlockList) print());
114 #ifndef PRODUCT
115 if (PrintCFGToFile) {
116 stringStream title;
117 title.print("BlockListBuilder ");
118 scope->method()->print_name(&title);
119 CFGPrinter::print_cfg(_bci2block, title.as_string(), false, false);
120 }
121 #endif
122 }
125 void BlockListBuilder::set_entries(int osr_bci) {
126 // generate start blocks
127 BlockBegin* std_entry = make_block_at(0, NULL);
128 if (scope()->caller() == NULL) {
129 std_entry->set(BlockBegin::std_entry_flag);
130 }
131 if (osr_bci != -1) {
132 BlockBegin* osr_entry = make_block_at(osr_bci, NULL);
133 osr_entry->set(BlockBegin::osr_entry_flag);
134 }
136 // generate exception entry blocks
137 XHandlers* list = xhandlers();
138 const int n = list->length();
139 for (int i = 0; i < n; i++) {
140 XHandler* h = list->handler_at(i);
141 BlockBegin* entry = make_block_at(h->handler_bci(), NULL);
142 entry->set(BlockBegin::exception_entry_flag);
143 h->set_entry_block(entry);
144 }
145 }
148 BlockBegin* BlockListBuilder::make_block_at(int cur_bci, BlockBegin* predecessor) {
149 assert(method()->bci_block_start().at(cur_bci), "wrong block starts of MethodLivenessAnalyzer");
151 BlockBegin* block = _bci2block->at(cur_bci);
152 if (block == NULL) {
153 block = new BlockBegin(cur_bci);
154 block->init_stores_to_locals(method()->max_locals());
155 _bci2block->at_put(cur_bci, block);
156 _blocks.append(block);
158 assert(predecessor == NULL || predecessor->bci() < cur_bci, "targets for backward branches must already exist");
159 }
161 if (predecessor != NULL) {
162 if (block->is_set(BlockBegin::exception_entry_flag)) {
163 BAILOUT_("Exception handler can be reached by both normal and exceptional control flow", block);
164 }
166 predecessor->add_successor(block);
167 block->increment_total_preds();
168 }
170 return block;
171 }
174 inline void BlockListBuilder::store_one(BlockBegin* current, int local) {
175 current->stores_to_locals().set_bit(local);
176 }
177 inline void BlockListBuilder::store_two(BlockBegin* current, int local) {
178 store_one(current, local);
179 store_one(current, local + 1);
180 }
183 void BlockListBuilder::handle_exceptions(BlockBegin* current, int cur_bci) {
184 // Draws edges from a block to its exception handlers
185 XHandlers* list = xhandlers();
186 const int n = list->length();
188 for (int i = 0; i < n; i++) {
189 XHandler* h = list->handler_at(i);
191 if (h->covers(cur_bci)) {
192 BlockBegin* entry = h->entry_block();
193 assert(entry != NULL && entry == _bci2block->at(h->handler_bci()), "entry must be set");
194 assert(entry->is_set(BlockBegin::exception_entry_flag), "flag must be set");
196 // add each exception handler only once
197 if (!current->is_successor(entry)) {
198 current->add_successor(entry);
199 entry->increment_total_preds();
200 }
202 // stop when reaching catchall
203 if (h->catch_type() == 0) break;
204 }
205 }
206 }
208 void BlockListBuilder::handle_jsr(BlockBegin* current, int sr_bci, int next_bci) {
209 // start a new block after jsr-bytecode and link this block into cfg
210 make_block_at(next_bci, current);
212 // start a new block at the subroutine entry at mark it with special flag
213 BlockBegin* sr_block = make_block_at(sr_bci, current);
214 if (!sr_block->is_set(BlockBegin::subroutine_entry_flag)) {
215 sr_block->set(BlockBegin::subroutine_entry_flag);
216 }
217 }
220 void BlockListBuilder::set_leaders() {
221 bool has_xhandlers = xhandlers()->has_handlers();
222 BlockBegin* current = NULL;
224 // The information which bci starts a new block simplifies the analysis
225 // Without it, backward branches could jump to a bci where no block was created
226 // during bytecode iteration. This would require the creation of a new block at the
227 // branch target and a modification of the successor lists.
228 BitMap bci_block_start = method()->bci_block_start();
230 ciBytecodeStream s(method());
231 while (s.next() != ciBytecodeStream::EOBC()) {
232 int cur_bci = s.cur_bci();
234 if (bci_block_start.at(cur_bci)) {
235 current = make_block_at(cur_bci, current);
236 }
237 assert(current != NULL, "must have current block");
239 if (has_xhandlers && GraphBuilder::can_trap(method(), s.cur_bc())) {
240 handle_exceptions(current, cur_bci);
241 }
243 switch (s.cur_bc()) {
244 // track stores to local variables for selective creation of phi functions
245 case Bytecodes::_iinc: store_one(current, s.get_index()); break;
246 case Bytecodes::_istore: store_one(current, s.get_index()); break;
247 case Bytecodes::_lstore: store_two(current, s.get_index()); break;
248 case Bytecodes::_fstore: store_one(current, s.get_index()); break;
249 case Bytecodes::_dstore: store_two(current, s.get_index()); break;
250 case Bytecodes::_astore: store_one(current, s.get_index()); break;
251 case Bytecodes::_istore_0: store_one(current, 0); break;
252 case Bytecodes::_istore_1: store_one(current, 1); break;
253 case Bytecodes::_istore_2: store_one(current, 2); break;
254 case Bytecodes::_istore_3: store_one(current, 3); break;
255 case Bytecodes::_lstore_0: store_two(current, 0); break;
256 case Bytecodes::_lstore_1: store_two(current, 1); break;
257 case Bytecodes::_lstore_2: store_two(current, 2); break;
258 case Bytecodes::_lstore_3: store_two(current, 3); break;
259 case Bytecodes::_fstore_0: store_one(current, 0); break;
260 case Bytecodes::_fstore_1: store_one(current, 1); break;
261 case Bytecodes::_fstore_2: store_one(current, 2); break;
262 case Bytecodes::_fstore_3: store_one(current, 3); break;
263 case Bytecodes::_dstore_0: store_two(current, 0); break;
264 case Bytecodes::_dstore_1: store_two(current, 1); break;
265 case Bytecodes::_dstore_2: store_two(current, 2); break;
266 case Bytecodes::_dstore_3: store_two(current, 3); break;
267 case Bytecodes::_astore_0: store_one(current, 0); break;
268 case Bytecodes::_astore_1: store_one(current, 1); break;
269 case Bytecodes::_astore_2: store_one(current, 2); break;
270 case Bytecodes::_astore_3: store_one(current, 3); break;
272 // track bytecodes that affect the control flow
273 case Bytecodes::_athrow: // fall through
274 case Bytecodes::_ret: // fall through
275 case Bytecodes::_ireturn: // fall through
276 case Bytecodes::_lreturn: // fall through
277 case Bytecodes::_freturn: // fall through
278 case Bytecodes::_dreturn: // fall through
279 case Bytecodes::_areturn: // fall through
280 case Bytecodes::_return:
281 current = NULL;
282 break;
284 case Bytecodes::_ifeq: // fall through
285 case Bytecodes::_ifne: // fall through
286 case Bytecodes::_iflt: // fall through
287 case Bytecodes::_ifge: // fall through
288 case Bytecodes::_ifgt: // fall through
289 case Bytecodes::_ifle: // fall through
290 case Bytecodes::_if_icmpeq: // fall through
291 case Bytecodes::_if_icmpne: // fall through
292 case Bytecodes::_if_icmplt: // fall through
293 case Bytecodes::_if_icmpge: // fall through
294 case Bytecodes::_if_icmpgt: // fall through
295 case Bytecodes::_if_icmple: // fall through
296 case Bytecodes::_if_acmpeq: // fall through
297 case Bytecodes::_if_acmpne: // fall through
298 case Bytecodes::_ifnull: // fall through
299 case Bytecodes::_ifnonnull:
300 make_block_at(s.next_bci(), current);
301 make_block_at(s.get_dest(), current);
302 current = NULL;
303 break;
305 case Bytecodes::_goto:
306 make_block_at(s.get_dest(), current);
307 current = NULL;
308 break;
310 case Bytecodes::_goto_w:
311 make_block_at(s.get_far_dest(), current);
312 current = NULL;
313 break;
315 case Bytecodes::_jsr:
316 handle_jsr(current, s.get_dest(), s.next_bci());
317 current = NULL;
318 break;
320 case Bytecodes::_jsr_w:
321 handle_jsr(current, s.get_far_dest(), s.next_bci());
322 current = NULL;
323 break;
325 case Bytecodes::_tableswitch: {
326 // set block for each case
327 Bytecode_tableswitch sw(&s);
328 int l = sw.length();
329 for (int i = 0; i < l; i++) {
330 make_block_at(cur_bci + sw.dest_offset_at(i), current);
331 }
332 make_block_at(cur_bci + sw.default_offset(), current);
333 current = NULL;
334 break;
335 }
337 case Bytecodes::_lookupswitch: {
338 // set block for each case
339 Bytecode_lookupswitch sw(&s);
340 int l = sw.number_of_pairs();
341 for (int i = 0; i < l; i++) {
342 make_block_at(cur_bci + sw.pair_at(i).offset(), current);
343 }
344 make_block_at(cur_bci + sw.default_offset(), current);
345 current = NULL;
346 break;
347 }
348 }
349 }
350 }
353 void BlockListBuilder::mark_loops() {
354 ResourceMark rm;
356 _active = BitMap(BlockBegin::number_of_blocks()); _active.clear();
357 _visited = BitMap(BlockBegin::number_of_blocks()); _visited.clear();
358 _loop_map = intArray(BlockBegin::number_of_blocks(), 0);
359 _next_loop_index = 0;
360 _next_block_number = _blocks.length();
362 // recursively iterate the control flow graph
363 mark_loops(_bci2block->at(0), false);
364 assert(_next_block_number >= 0, "invalid block numbers");
365 }
367 void BlockListBuilder::make_loop_header(BlockBegin* block) {
368 if (block->is_set(BlockBegin::exception_entry_flag)) {
369 // exception edges may look like loops but don't mark them as such
370 // since it screws up block ordering.
371 return;
372 }
373 if (!block->is_set(BlockBegin::parser_loop_header_flag)) {
374 block->set(BlockBegin::parser_loop_header_flag);
376 assert(_loop_map.at(block->block_id()) == 0, "must not be set yet");
377 assert(0 <= _next_loop_index && _next_loop_index < BitsPerInt, "_next_loop_index is used as a bit-index in integer");
378 _loop_map.at_put(block->block_id(), 1 << _next_loop_index);
379 if (_next_loop_index < 31) _next_loop_index++;
380 } else {
381 // block already marked as loop header
382 assert(is_power_of_2((unsigned int)_loop_map.at(block->block_id())), "exactly one bit must be set");
383 }
384 }
386 int BlockListBuilder::mark_loops(BlockBegin* block, bool in_subroutine) {
387 int block_id = block->block_id();
389 if (_visited.at(block_id)) {
390 if (_active.at(block_id)) {
391 // reached block via backward branch
392 make_loop_header(block);
393 }
394 // return cached loop information for this block
395 return _loop_map.at(block_id);
396 }
398 if (block->is_set(BlockBegin::subroutine_entry_flag)) {
399 in_subroutine = true;
400 }
402 // set active and visited bits before successors are processed
403 _visited.set_bit(block_id);
404 _active.set_bit(block_id);
406 intptr_t loop_state = 0;
407 for (int i = block->number_of_sux() - 1; i >= 0; i--) {
408 // recursively process all successors
409 loop_state |= mark_loops(block->sux_at(i), in_subroutine);
410 }
412 // clear active-bit after all successors are processed
413 _active.clear_bit(block_id);
415 // reverse-post-order numbering of all blocks
416 block->set_depth_first_number(_next_block_number);
417 _next_block_number--;
419 if (loop_state != 0 || in_subroutine ) {
420 // block is contained at least in one loop, so phi functions are necessary
421 // phi functions are also necessary for all locals stored in a subroutine
422 scope()->requires_phi_function().set_union(block->stores_to_locals());
423 }
425 if (block->is_set(BlockBegin::parser_loop_header_flag)) {
426 int header_loop_state = _loop_map.at(block_id);
427 assert(is_power_of_2((unsigned)header_loop_state), "exactly one bit must be set");
429 // If the highest bit is set (i.e. when integer value is negative), the method
430 // has 32 or more loops. This bit is never cleared because it is used for multiple loops
431 if (header_loop_state >= 0) {
432 clear_bits(loop_state, header_loop_state);
433 }
434 }
436 // cache and return loop information for this block
437 _loop_map.at_put(block_id, loop_state);
438 return loop_state;
439 }
442 #ifndef PRODUCT
444 int compare_depth_first(BlockBegin** a, BlockBegin** b) {
445 return (*a)->depth_first_number() - (*b)->depth_first_number();
446 }
448 void BlockListBuilder::print() {
449 tty->print("----- initial block list of BlockListBuilder for method ");
450 method()->print_short_name();
451 tty->cr();
453 // better readability if blocks are sorted in processing order
454 _blocks.sort(compare_depth_first);
456 for (int i = 0; i < _blocks.length(); i++) {
457 BlockBegin* cur = _blocks.at(i);
458 tty->print("%4d: B%-4d bci: %-4d preds: %-4d ", cur->depth_first_number(), cur->block_id(), cur->bci(), cur->total_preds());
460 tty->print(cur->is_set(BlockBegin::std_entry_flag) ? " std" : " ");
461 tty->print(cur->is_set(BlockBegin::osr_entry_flag) ? " osr" : " ");
462 tty->print(cur->is_set(BlockBegin::exception_entry_flag) ? " ex" : " ");
463 tty->print(cur->is_set(BlockBegin::subroutine_entry_flag) ? " sr" : " ");
464 tty->print(cur->is_set(BlockBegin::parser_loop_header_flag) ? " lh" : " ");
466 if (cur->number_of_sux() > 0) {
467 tty->print(" sux: ");
468 for (int j = 0; j < cur->number_of_sux(); j++) {
469 BlockBegin* sux = cur->sux_at(j);
470 tty->print("B%d ", sux->block_id());
471 }
472 }
473 tty->cr();
474 }
475 }
477 #endif
480 // A simple growable array of Values indexed by ciFields
481 class FieldBuffer: public CompilationResourceObj {
482 private:
483 GrowableArray<Value> _values;
485 public:
486 FieldBuffer() {}
488 void kill() {
489 _values.trunc_to(0);
490 }
492 Value at(ciField* field) {
493 assert(field->holder()->is_loaded(), "must be a loaded field");
494 int offset = field->offset();
495 if (offset < _values.length()) {
496 return _values.at(offset);
497 } else {
498 return NULL;
499 }
500 }
502 void at_put(ciField* field, Value value) {
503 assert(field->holder()->is_loaded(), "must be a loaded field");
504 int offset = field->offset();
505 _values.at_put_grow(offset, value, NULL);
506 }
508 };
511 // MemoryBuffer is fairly simple model of the current state of memory.
512 // It partitions memory into several pieces. The first piece is
513 // generic memory where little is known about the owner of the memory.
514 // This is conceptually represented by the tuple <O, F, V> which says
515 // that the field F of object O has value V. This is flattened so
516 // that F is represented by the offset of the field and the parallel
517 // arrays _objects and _values are used for O and V. Loads of O.F can
518 // simply use V. Newly allocated objects are kept in a separate list
519 // along with a parallel array for each object which represents the
520 // current value of its fields. Stores of the default value to fields
521 // which have never been stored to before are eliminated since they
522 // are redundant. Once newly allocated objects are stored into
523 // another object or they are passed out of the current compile they
524 // are treated like generic memory.
526 class MemoryBuffer: public CompilationResourceObj {
527 private:
528 FieldBuffer _values;
529 GrowableArray<Value> _objects;
530 GrowableArray<Value> _newobjects;
531 GrowableArray<FieldBuffer*> _fields;
533 public:
534 MemoryBuffer() {}
536 StoreField* store(StoreField* st) {
537 if (!EliminateFieldAccess) {
538 return st;
539 }
541 Value object = st->obj();
542 Value value = st->value();
543 ciField* field = st->field();
544 if (field->holder()->is_loaded()) {
545 int offset = field->offset();
546 int index = _newobjects.find(object);
547 if (index != -1) {
548 // newly allocated object with no other stores performed on this field
549 FieldBuffer* buf = _fields.at(index);
550 if (buf->at(field) == NULL && is_default_value(value)) {
551 #ifndef PRODUCT
552 if (PrintIRDuringConstruction && Verbose) {
553 tty->print_cr("Eliminated store for object %d:", index);
554 st->print_line();
555 }
556 #endif
557 return NULL;
558 } else {
559 buf->at_put(field, value);
560 }
561 } else {
562 _objects.at_put_grow(offset, object, NULL);
563 _values.at_put(field, value);
564 }
566 store_value(value);
567 } else {
568 // if we held onto field names we could alias based on names but
569 // we don't know what's being stored to so kill it all.
570 kill();
571 }
572 return st;
573 }
576 // return true if this value correspond to the default value of a field.
577 bool is_default_value(Value value) {
578 Constant* con = value->as_Constant();
579 if (con) {
580 switch (con->type()->tag()) {
581 case intTag: return con->type()->as_IntConstant()->value() == 0;
582 case longTag: return con->type()->as_LongConstant()->value() == 0;
583 case floatTag: return jint_cast(con->type()->as_FloatConstant()->value()) == 0;
584 case doubleTag: return jlong_cast(con->type()->as_DoubleConstant()->value()) == jlong_cast(0);
585 case objectTag: return con->type() == objectNull;
586 default: ShouldNotReachHere();
587 }
588 }
589 return false;
590 }
593 // return either the actual value of a load or the load itself
594 Value load(LoadField* load) {
595 if (!EliminateFieldAccess) {
596 return load;
597 }
599 if (RoundFPResults && UseSSE < 2 && load->type()->is_float_kind()) {
600 // can't skip load since value might get rounded as a side effect
601 return load;
602 }
604 ciField* field = load->field();
605 Value object = load->obj();
606 if (field->holder()->is_loaded() && !field->is_volatile()) {
607 int offset = field->offset();
608 Value result = NULL;
609 int index = _newobjects.find(object);
610 if (index != -1) {
611 result = _fields.at(index)->at(field);
612 } else if (_objects.at_grow(offset, NULL) == object) {
613 result = _values.at(field);
614 }
615 if (result != NULL) {
616 #ifndef PRODUCT
617 if (PrintIRDuringConstruction && Verbose) {
618 tty->print_cr("Eliminated load: ");
619 load->print_line();
620 }
621 #endif
622 assert(result->type()->tag() == load->type()->tag(), "wrong types");
623 return result;
624 }
625 }
626 return load;
627 }
629 // Record this newly allocated object
630 void new_instance(NewInstance* object) {
631 int index = _newobjects.length();
632 _newobjects.append(object);
633 if (_fields.at_grow(index, NULL) == NULL) {
634 _fields.at_put(index, new FieldBuffer());
635 } else {
636 _fields.at(index)->kill();
637 }
638 }
640 void store_value(Value value) {
641 int index = _newobjects.find(value);
642 if (index != -1) {
643 // stored a newly allocated object into another object.
644 // Assume we've lost track of it as separate slice of memory.
645 // We could do better by keeping track of whether individual
646 // fields could alias each other.
647 _newobjects.remove_at(index);
648 // pull out the field info and store it at the end up the list
649 // of field info list to be reused later.
650 _fields.append(_fields.at(index));
651 _fields.remove_at(index);
652 }
653 }
655 void kill() {
656 _newobjects.trunc_to(0);
657 _objects.trunc_to(0);
658 _values.kill();
659 }
660 };
663 // Implementation of GraphBuilder's ScopeData
665 GraphBuilder::ScopeData::ScopeData(ScopeData* parent)
666 : _parent(parent)
667 , _bci2block(NULL)
668 , _scope(NULL)
669 , _has_handler(false)
670 , _stream(NULL)
671 , _work_list(NULL)
672 , _parsing_jsr(false)
673 , _jsr_xhandlers(NULL)
674 , _caller_stack_size(-1)
675 , _continuation(NULL)
676 , _num_returns(0)
677 , _cleanup_block(NULL)
678 , _cleanup_return_prev(NULL)
679 , _cleanup_state(NULL)
680 {
681 if (parent != NULL) {
682 _max_inline_size = (intx) ((float) NestedInliningSizeRatio * (float) parent->max_inline_size() / 100.0f);
683 } else {
684 _max_inline_size = MaxInlineSize;
685 }
686 if (_max_inline_size < MaxTrivialSize) {
687 _max_inline_size = MaxTrivialSize;
688 }
689 }
692 void GraphBuilder::kill_all() {
693 if (UseLocalValueNumbering) {
694 vmap()->kill_all();
695 }
696 _memory->kill();
697 }
700 BlockBegin* GraphBuilder::ScopeData::block_at(int bci) {
701 if (parsing_jsr()) {
702 // It is necessary to clone all blocks associated with a
703 // subroutine, including those for exception handlers in the scope
704 // of the method containing the jsr (because those exception
705 // handlers may contain ret instructions in some cases).
706 BlockBegin* block = bci2block()->at(bci);
707 if (block != NULL && block == parent()->bci2block()->at(bci)) {
708 BlockBegin* new_block = new BlockBegin(block->bci());
709 #ifndef PRODUCT
710 if (PrintInitialBlockList) {
711 tty->print_cr("CFG: cloned block %d (bci %d) as block %d for jsr",
712 block->block_id(), block->bci(), new_block->block_id());
713 }
714 #endif
715 // copy data from cloned blocked
716 new_block->set_depth_first_number(block->depth_first_number());
717 if (block->is_set(BlockBegin::parser_loop_header_flag)) new_block->set(BlockBegin::parser_loop_header_flag);
718 // Preserve certain flags for assertion checking
719 if (block->is_set(BlockBegin::subroutine_entry_flag)) new_block->set(BlockBegin::subroutine_entry_flag);
720 if (block->is_set(BlockBegin::exception_entry_flag)) new_block->set(BlockBegin::exception_entry_flag);
722 // copy was_visited_flag to allow early detection of bailouts
723 // if a block that is used in a jsr has already been visited before,
724 // it is shared between the normal control flow and a subroutine
725 // BlockBegin::try_merge returns false when the flag is set, this leads
726 // to a compilation bailout
727 if (block->is_set(BlockBegin::was_visited_flag)) new_block->set(BlockBegin::was_visited_flag);
729 bci2block()->at_put(bci, new_block);
730 block = new_block;
731 }
732 return block;
733 } else {
734 return bci2block()->at(bci);
735 }
736 }
739 XHandlers* GraphBuilder::ScopeData::xhandlers() const {
740 if (_jsr_xhandlers == NULL) {
741 assert(!parsing_jsr(), "");
742 return scope()->xhandlers();
743 }
744 assert(parsing_jsr(), "");
745 return _jsr_xhandlers;
746 }
749 void GraphBuilder::ScopeData::set_scope(IRScope* scope) {
750 _scope = scope;
751 bool parent_has_handler = false;
752 if (parent() != NULL) {
753 parent_has_handler = parent()->has_handler();
754 }
755 _has_handler = parent_has_handler || scope->xhandlers()->has_handlers();
756 }
759 void GraphBuilder::ScopeData::set_inline_cleanup_info(BlockBegin* block,
760 Instruction* return_prev,
761 ValueStack* return_state) {
762 _cleanup_block = block;
763 _cleanup_return_prev = return_prev;
764 _cleanup_state = return_state;
765 }
768 void GraphBuilder::ScopeData::add_to_work_list(BlockBegin* block) {
769 if (_work_list == NULL) {
770 _work_list = new BlockList();
771 }
773 if (!block->is_set(BlockBegin::is_on_work_list_flag)) {
774 // Do not start parsing the continuation block while in a
775 // sub-scope
776 if (parsing_jsr()) {
777 if (block == jsr_continuation()) {
778 return;
779 }
780 } else {
781 if (block == continuation()) {
782 return;
783 }
784 }
785 block->set(BlockBegin::is_on_work_list_flag);
786 _work_list->push(block);
788 sort_top_into_worklist(_work_list, block);
789 }
790 }
793 void GraphBuilder::sort_top_into_worklist(BlockList* worklist, BlockBegin* top) {
794 assert(worklist->top() == top, "");
795 // sort block descending into work list
796 const int dfn = top->depth_first_number();
797 assert(dfn != -1, "unknown depth first number");
798 int i = worklist->length()-2;
799 while (i >= 0) {
800 BlockBegin* b = worklist->at(i);
801 if (b->depth_first_number() < dfn) {
802 worklist->at_put(i+1, b);
803 } else {
804 break;
805 }
806 i --;
807 }
808 if (i >= -1) worklist->at_put(i + 1, top);
809 }
812 BlockBegin* GraphBuilder::ScopeData::remove_from_work_list() {
813 if (is_work_list_empty()) {
814 return NULL;
815 }
816 return _work_list->pop();
817 }
820 bool GraphBuilder::ScopeData::is_work_list_empty() const {
821 return (_work_list == NULL || _work_list->length() == 0);
822 }
825 void GraphBuilder::ScopeData::setup_jsr_xhandlers() {
826 assert(parsing_jsr(), "");
827 // clone all the exception handlers from the scope
828 XHandlers* handlers = new XHandlers(scope()->xhandlers());
829 const int n = handlers->length();
830 for (int i = 0; i < n; i++) {
831 // The XHandlers need to be adjusted to dispatch to the cloned
832 // handler block instead of the default one but the synthetic
833 // unlocker needs to be handled specially. The synthetic unlocker
834 // should be left alone since there can be only one and all code
835 // should dispatch to the same one.
836 XHandler* h = handlers->handler_at(i);
837 assert(h->handler_bci() != SynchronizationEntryBCI, "must be real");
838 h->set_entry_block(block_at(h->handler_bci()));
839 }
840 _jsr_xhandlers = handlers;
841 }
844 int GraphBuilder::ScopeData::num_returns() {
845 if (parsing_jsr()) {
846 return parent()->num_returns();
847 }
848 return _num_returns;
849 }
852 void GraphBuilder::ScopeData::incr_num_returns() {
853 if (parsing_jsr()) {
854 parent()->incr_num_returns();
855 } else {
856 ++_num_returns;
857 }
858 }
861 // Implementation of GraphBuilder
863 #define INLINE_BAILOUT(msg) { inline_bailout(msg); return false; }
866 void GraphBuilder::load_constant() {
867 ciConstant con = stream()->get_constant();
868 if (con.basic_type() == T_ILLEGAL) {
869 BAILOUT("could not resolve a constant");
870 } else {
871 ValueType* t = illegalType;
872 ValueStack* patch_state = NULL;
873 switch (con.basic_type()) {
874 case T_BOOLEAN: t = new IntConstant (con.as_boolean()); break;
875 case T_BYTE : t = new IntConstant (con.as_byte ()); break;
876 case T_CHAR : t = new IntConstant (con.as_char ()); break;
877 case T_SHORT : t = new IntConstant (con.as_short ()); break;
878 case T_INT : t = new IntConstant (con.as_int ()); break;
879 case T_LONG : t = new LongConstant (con.as_long ()); break;
880 case T_FLOAT : t = new FloatConstant (con.as_float ()); break;
881 case T_DOUBLE : t = new DoubleConstant (con.as_double ()); break;
882 case T_ARRAY : t = new ArrayConstant (con.as_object ()->as_array ()); break;
883 case T_OBJECT :
884 {
885 ciObject* obj = con.as_object();
886 if (!obj->is_loaded()
887 || (PatchALot && obj->klass() != ciEnv::current()->String_klass())) {
888 patch_state = copy_state_before();
889 t = new ObjectConstant(obj);
890 } else {
891 assert(obj->is_instance(), "must be java_mirror of klass");
892 t = new InstanceConstant(obj->as_instance());
893 }
894 break;
895 }
896 default : ShouldNotReachHere();
897 }
898 Value x;
899 if (patch_state != NULL) {
900 x = new Constant(t, patch_state);
901 } else {
902 x = new Constant(t);
903 }
904 push(t, append(x));
905 }
906 }
909 void GraphBuilder::load_local(ValueType* type, int index) {
910 Value x = state()->local_at(index);
911 assert(x != NULL && !x->type()->is_illegal(), "access of illegal local variable");
912 push(type, x);
913 }
916 void GraphBuilder::store_local(ValueType* type, int index) {
917 Value x = pop(type);
918 store_local(state(), x, index);
919 }
922 void GraphBuilder::store_local(ValueStack* state, Value x, int index) {
923 if (parsing_jsr()) {
924 // We need to do additional tracking of the location of the return
925 // address for jsrs since we don't handle arbitrary jsr/ret
926 // constructs. Here we are figuring out in which circumstances we
927 // need to bail out.
928 if (x->type()->is_address()) {
929 scope_data()->set_jsr_return_address_local(index);
931 // Also check parent jsrs (if any) at this time to see whether
932 // they are using this local. We don't handle skipping over a
933 // ret.
934 for (ScopeData* cur_scope_data = scope_data()->parent();
935 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
936 cur_scope_data = cur_scope_data->parent()) {
937 if (cur_scope_data->jsr_return_address_local() == index) {
938 BAILOUT("subroutine overwrites return address from previous subroutine");
939 }
940 }
941 } else if (index == scope_data()->jsr_return_address_local()) {
942 scope_data()->set_jsr_return_address_local(-1);
943 }
944 }
946 state->store_local(index, round_fp(x));
947 }
950 void GraphBuilder::load_indexed(BasicType type) {
951 // In case of in block code motion in range check elimination
952 ValueStack* state_before = copy_state_indexed_access();
953 compilation()->set_has_access_indexed(true);
954 Value index = ipop();
955 Value array = apop();
956 Value length = NULL;
957 if (CSEArrayLength ||
958 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
959 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) {
960 length = append(new ArrayLength(array, state_before));
961 }
962 push(as_ValueType(type), append(new LoadIndexed(array, index, length, type, state_before)));
963 }
966 void GraphBuilder::store_indexed(BasicType type) {
967 // In case of in block code motion in range check elimination
968 ValueStack* state_before = copy_state_indexed_access();
969 compilation()->set_has_access_indexed(true);
970 Value value = pop(as_ValueType(type));
971 Value index = ipop();
972 Value array = apop();
973 Value length = NULL;
974 if (CSEArrayLength ||
975 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
976 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) {
977 length = append(new ArrayLength(array, state_before));
978 }
979 ciType* array_type = array->declared_type();
980 bool check_boolean = false;
981 if (array_type != NULL) {
982 if (array_type->is_loaded() &&
983 array_type->as_array_klass()->element_type()->basic_type() == T_BOOLEAN) {
984 assert(type == T_BYTE, "boolean store uses bastore");
985 Value mask = append(new Constant(new IntConstant(1)));
986 value = append(new LogicOp(Bytecodes::_iand, value, mask));
987 }
988 } else if (type == T_BYTE) {
989 check_boolean = true;
990 }
991 StoreIndexed* result = new StoreIndexed(array, index, length, type, value, state_before, check_boolean);
992 append(result);
993 _memory->store_value(value);
995 if (type == T_OBJECT && is_profiling()) {
996 // Note that we'd collect profile data in this method if we wanted it.
997 compilation()->set_would_profile(true);
999 if (profile_checkcasts()) {
1000 result->set_profiled_method(method());
1001 result->set_profiled_bci(bci());
1002 result->set_should_profile(true);
1003 }
1004 }
1005 }
1008 void GraphBuilder::stack_op(Bytecodes::Code code) {
1009 switch (code) {
1010 case Bytecodes::_pop:
1011 { state()->raw_pop();
1012 }
1013 break;
1014 case Bytecodes::_pop2:
1015 { state()->raw_pop();
1016 state()->raw_pop();
1017 }
1018 break;
1019 case Bytecodes::_dup:
1020 { Value w = state()->raw_pop();
1021 state()->raw_push(w);
1022 state()->raw_push(w);
1023 }
1024 break;
1025 case Bytecodes::_dup_x1:
1026 { Value w1 = state()->raw_pop();
1027 Value w2 = state()->raw_pop();
1028 state()->raw_push(w1);
1029 state()->raw_push(w2);
1030 state()->raw_push(w1);
1031 }
1032 break;
1033 case Bytecodes::_dup_x2:
1034 { Value w1 = state()->raw_pop();
1035 Value w2 = state()->raw_pop();
1036 Value w3 = state()->raw_pop();
1037 state()->raw_push(w1);
1038 state()->raw_push(w3);
1039 state()->raw_push(w2);
1040 state()->raw_push(w1);
1041 }
1042 break;
1043 case Bytecodes::_dup2:
1044 { Value w1 = state()->raw_pop();
1045 Value w2 = state()->raw_pop();
1046 state()->raw_push(w2);
1047 state()->raw_push(w1);
1048 state()->raw_push(w2);
1049 state()->raw_push(w1);
1050 }
1051 break;
1052 case Bytecodes::_dup2_x1:
1053 { Value w1 = state()->raw_pop();
1054 Value w2 = state()->raw_pop();
1055 Value w3 = state()->raw_pop();
1056 state()->raw_push(w2);
1057 state()->raw_push(w1);
1058 state()->raw_push(w3);
1059 state()->raw_push(w2);
1060 state()->raw_push(w1);
1061 }
1062 break;
1063 case Bytecodes::_dup2_x2:
1064 { Value w1 = state()->raw_pop();
1065 Value w2 = state()->raw_pop();
1066 Value w3 = state()->raw_pop();
1067 Value w4 = state()->raw_pop();
1068 state()->raw_push(w2);
1069 state()->raw_push(w1);
1070 state()->raw_push(w4);
1071 state()->raw_push(w3);
1072 state()->raw_push(w2);
1073 state()->raw_push(w1);
1074 }
1075 break;
1076 case Bytecodes::_swap:
1077 { Value w1 = state()->raw_pop();
1078 Value w2 = state()->raw_pop();
1079 state()->raw_push(w1);
1080 state()->raw_push(w2);
1081 }
1082 break;
1083 default:
1084 ShouldNotReachHere();
1085 break;
1086 }
1087 }
1090 void GraphBuilder::arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* state_before) {
1091 Value y = pop(type);
1092 Value x = pop(type);
1093 // NOTE: strictfp can be queried from current method since we don't
1094 // inline methods with differing strictfp bits
1095 Value res = new ArithmeticOp(code, x, y, method()->is_strict(), state_before);
1096 // Note: currently single-precision floating-point rounding on Intel is handled at the LIRGenerator level
1097 res = append(res);
1098 if (method()->is_strict()) {
1099 res = round_fp(res);
1100 }
1101 push(type, res);
1102 }
1105 void GraphBuilder::negate_op(ValueType* type) {
1106 push(type, append(new NegateOp(pop(type))));
1107 }
1110 void GraphBuilder::shift_op(ValueType* type, Bytecodes::Code code) {
1111 Value s = ipop();
1112 Value x = pop(type);
1113 // try to simplify
1114 // Note: This code should go into the canonicalizer as soon as it can
1115 // can handle canonicalized forms that contain more than one node.
1116 if (CanonicalizeNodes && code == Bytecodes::_iushr) {
1117 // pattern: x >>> s
1118 IntConstant* s1 = s->type()->as_IntConstant();
1119 if (s1 != NULL) {
1120 // pattern: x >>> s1, with s1 constant
1121 ShiftOp* l = x->as_ShiftOp();
1122 if (l != NULL && l->op() == Bytecodes::_ishl) {
1123 // pattern: (a << b) >>> s1
1124 IntConstant* s0 = l->y()->type()->as_IntConstant();
1125 if (s0 != NULL) {
1126 // pattern: (a << s0) >>> s1
1127 const int s0c = s0->value() & 0x1F; // only the low 5 bits are significant for shifts
1128 const int s1c = s1->value() & 0x1F; // only the low 5 bits are significant for shifts
1129 if (s0c == s1c) {
1130 if (s0c == 0) {
1131 // pattern: (a << 0) >>> 0 => simplify to: a
1132 ipush(l->x());
1133 } else {
1134 // pattern: (a << s0c) >>> s0c => simplify to: a & m, with m constant
1135 assert(0 < s0c && s0c < BitsPerInt, "adjust code below to handle corner cases");
1136 const int m = (1 << (BitsPerInt - s0c)) - 1;
1137 Value s = append(new Constant(new IntConstant(m)));
1138 ipush(append(new LogicOp(Bytecodes::_iand, l->x(), s)));
1139 }
1140 return;
1141 }
1142 }
1143 }
1144 }
1145 }
1146 // could not simplify
1147 push(type, append(new ShiftOp(code, x, s)));
1148 }
1151 void GraphBuilder::logic_op(ValueType* type, Bytecodes::Code code) {
1152 Value y = pop(type);
1153 Value x = pop(type);
1154 push(type, append(new LogicOp(code, x, y)));
1155 }
1158 void GraphBuilder::compare_op(ValueType* type, Bytecodes::Code code) {
1159 ValueStack* state_before = copy_state_before();
1160 Value y = pop(type);
1161 Value x = pop(type);
1162 ipush(append(new CompareOp(code, x, y, state_before)));
1163 }
1166 void GraphBuilder::convert(Bytecodes::Code op, BasicType from, BasicType to) {
1167 push(as_ValueType(to), append(new Convert(op, pop(as_ValueType(from)), as_ValueType(to))));
1168 }
1171 void GraphBuilder::increment() {
1172 int index = stream()->get_index();
1173 int delta = stream()->is_wide() ? (signed short)Bytes::get_Java_u2(stream()->cur_bcp() + 4) : (signed char)(stream()->cur_bcp()[2]);
1174 load_local(intType, index);
1175 ipush(append(new Constant(new IntConstant(delta))));
1176 arithmetic_op(intType, Bytecodes::_iadd);
1177 store_local(intType, index);
1178 }
1181 void GraphBuilder::_goto(int from_bci, int to_bci) {
1182 Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci);
1183 if (is_profiling()) {
1184 compilation()->set_would_profile(true);
1185 x->set_profiled_bci(bci());
1186 if (profile_branches()) {
1187 x->set_profiled_method(method());
1188 x->set_should_profile(true);
1189 }
1190 }
1191 append(x);
1192 }
1195 void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) {
1196 BlockBegin* tsux = block_at(stream()->get_dest());
1197 BlockBegin* fsux = block_at(stream()->next_bci());
1198 bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci();
1199 // In case of loop invariant code motion or predicate insertion
1200 // before the body of a loop the state is needed
1201 Instruction *i = append(new If(x, cond, false, y, tsux, fsux, (is_bb || compilation()->is_optimistic()) ? state_before : NULL, is_bb));
1203 assert(i->as_Goto() == NULL ||
1204 (i->as_Goto()->sux_at(0) == tsux && i->as_Goto()->is_safepoint() == tsux->bci() < stream()->cur_bci()) ||
1205 (i->as_Goto()->sux_at(0) == fsux && i->as_Goto()->is_safepoint() == fsux->bci() < stream()->cur_bci()),
1206 "safepoint state of Goto returned by canonicalizer incorrect");
1208 if (is_profiling()) {
1209 If* if_node = i->as_If();
1210 if (if_node != NULL) {
1211 // Note that we'd collect profile data in this method if we wanted it.
1212 compilation()->set_would_profile(true);
1213 // At level 2 we need the proper bci to count backedges
1214 if_node->set_profiled_bci(bci());
1215 if (profile_branches()) {
1216 // Successors can be rotated by the canonicalizer, check for this case.
1217 if_node->set_profiled_method(method());
1218 if_node->set_should_profile(true);
1219 if (if_node->tsux() == fsux) {
1220 if_node->set_swapped(true);
1221 }
1222 }
1223 return;
1224 }
1226 // Check if this If was reduced to Goto.
1227 Goto *goto_node = i->as_Goto();
1228 if (goto_node != NULL) {
1229 compilation()->set_would_profile(true);
1230 goto_node->set_profiled_bci(bci());
1231 if (profile_branches()) {
1232 goto_node->set_profiled_method(method());
1233 goto_node->set_should_profile(true);
1234 // Find out which successor is used.
1235 if (goto_node->default_sux() == tsux) {
1236 goto_node->set_direction(Goto::taken);
1237 } else if (goto_node->default_sux() == fsux) {
1238 goto_node->set_direction(Goto::not_taken);
1239 } else {
1240 ShouldNotReachHere();
1241 }
1242 }
1243 return;
1244 }
1245 }
1246 }
1249 void GraphBuilder::if_zero(ValueType* type, If::Condition cond) {
1250 Value y = append(new Constant(intZero));
1251 ValueStack* state_before = copy_state_before();
1252 Value x = ipop();
1253 if_node(x, cond, y, state_before);
1254 }
1257 void GraphBuilder::if_null(ValueType* type, If::Condition cond) {
1258 Value y = append(new Constant(objectNull));
1259 ValueStack* state_before = copy_state_before();
1260 Value x = apop();
1261 if_node(x, cond, y, state_before);
1262 }
1265 void GraphBuilder::if_same(ValueType* type, If::Condition cond) {
1266 ValueStack* state_before = copy_state_before();
1267 Value y = pop(type);
1268 Value x = pop(type);
1269 if_node(x, cond, y, state_before);
1270 }
1273 void GraphBuilder::jsr(int dest) {
1274 // We only handle well-formed jsrs (those which are "block-structured").
1275 // If the bytecodes are strange (jumping out of a jsr block) then we
1276 // might end up trying to re-parse a block containing a jsr which
1277 // has already been activated. Watch for this case and bail out.
1278 for (ScopeData* cur_scope_data = scope_data();
1279 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
1280 cur_scope_data = cur_scope_data->parent()) {
1281 if (cur_scope_data->jsr_entry_bci() == dest) {
1282 BAILOUT("too-complicated jsr/ret structure");
1283 }
1284 }
1286 push(addressType, append(new Constant(new AddressConstant(next_bci()))));
1287 if (!try_inline_jsr(dest)) {
1288 return; // bailed out while parsing and inlining subroutine
1289 }
1290 }
1293 void GraphBuilder::ret(int local_index) {
1294 if (!parsing_jsr()) BAILOUT("ret encountered while not parsing subroutine");
1296 if (local_index != scope_data()->jsr_return_address_local()) {
1297 BAILOUT("can not handle complicated jsr/ret constructs");
1298 }
1300 // Rets simply become (NON-SAFEPOINT) gotos to the jsr continuation
1301 append(new Goto(scope_data()->jsr_continuation(), false));
1302 }
1305 void GraphBuilder::table_switch() {
1306 Bytecode_tableswitch sw(stream());
1307 const int l = sw.length();
1308 if (CanonicalizeNodes && l == 1) {
1309 // total of 2 successors => use If instead of switch
1310 // Note: This code should go into the canonicalizer as soon as it can
1311 // can handle canonicalized forms that contain more than one node.
1312 Value key = append(new Constant(new IntConstant(sw.low_key())));
1313 BlockBegin* tsux = block_at(bci() + sw.dest_offset_at(0));
1314 BlockBegin* fsux = block_at(bci() + sw.default_offset());
1315 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
1316 // In case of loop invariant code motion or predicate insertion
1317 // before the body of a loop the state is needed
1318 ValueStack* state_before = copy_state_if_bb(is_bb);
1319 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
1320 } else {
1321 // collect successors
1322 BlockList* sux = new BlockList(l + 1, NULL);
1323 int i;
1324 bool has_bb = false;
1325 for (i = 0; i < l; i++) {
1326 sux->at_put(i, block_at(bci() + sw.dest_offset_at(i)));
1327 if (sw.dest_offset_at(i) < 0) has_bb = true;
1328 }
1329 // add default successor
1330 if (sw.default_offset() < 0) has_bb = true;
1331 sux->at_put(i, block_at(bci() + sw.default_offset()));
1332 // In case of loop invariant code motion or predicate insertion
1333 // before the body of a loop the state is needed
1334 ValueStack* state_before = copy_state_if_bb(has_bb);
1335 Instruction* res = append(new TableSwitch(ipop(), sux, sw.low_key(), state_before, has_bb));
1336 #ifdef ASSERT
1337 if (res->as_Goto()) {
1338 for (i = 0; i < l; i++) {
1339 if (sux->at(i) == res->as_Goto()->sux_at(0)) {
1340 assert(res->as_Goto()->is_safepoint() == sw.dest_offset_at(i) < 0, "safepoint state of Goto returned by canonicalizer incorrect");
1341 }
1342 }
1343 }
1344 #endif
1345 }
1346 }
1349 void GraphBuilder::lookup_switch() {
1350 Bytecode_lookupswitch sw(stream());
1351 const int l = sw.number_of_pairs();
1352 if (CanonicalizeNodes && l == 1) {
1353 // total of 2 successors => use If instead of switch
1354 // Note: This code should go into the canonicalizer as soon as it can
1355 // can handle canonicalized forms that contain more than one node.
1356 // simplify to If
1357 LookupswitchPair pair = sw.pair_at(0);
1358 Value key = append(new Constant(new IntConstant(pair.match())));
1359 BlockBegin* tsux = block_at(bci() + pair.offset());
1360 BlockBegin* fsux = block_at(bci() + sw.default_offset());
1361 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
1362 // In case of loop invariant code motion or predicate insertion
1363 // before the body of a loop the state is needed
1364 ValueStack* state_before = copy_state_if_bb(is_bb);;
1365 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
1366 } else {
1367 // collect successors & keys
1368 BlockList* sux = new BlockList(l + 1, NULL);
1369 intArray* keys = new intArray(l, 0);
1370 int i;
1371 bool has_bb = false;
1372 for (i = 0; i < l; i++) {
1373 LookupswitchPair pair = sw.pair_at(i);
1374 if (pair.offset() < 0) has_bb = true;
1375 sux->at_put(i, block_at(bci() + pair.offset()));
1376 keys->at_put(i, pair.match());
1377 }
1378 // add default successor
1379 if (sw.default_offset() < 0) has_bb = true;
1380 sux->at_put(i, block_at(bci() + sw.default_offset()));
1381 // In case of loop invariant code motion or predicate insertion
1382 // before the body of a loop the state is needed
1383 ValueStack* state_before = copy_state_if_bb(has_bb);
1384 Instruction* res = append(new LookupSwitch(ipop(), sux, keys, state_before, has_bb));
1385 #ifdef ASSERT
1386 if (res->as_Goto()) {
1387 for (i = 0; i < l; i++) {
1388 if (sux->at(i) == res->as_Goto()->sux_at(0)) {
1389 assert(res->as_Goto()->is_safepoint() == sw.pair_at(i).offset() < 0, "safepoint state of Goto returned by canonicalizer incorrect");
1390 }
1391 }
1392 }
1393 #endif
1394 }
1395 }
1397 void GraphBuilder::call_register_finalizer() {
1398 // If the receiver requires finalization then emit code to perform
1399 // the registration on return.
1401 // Gather some type information about the receiver
1402 Value receiver = state()->local_at(0);
1403 assert(receiver != NULL, "must have a receiver");
1404 ciType* declared_type = receiver->declared_type();
1405 ciType* exact_type = receiver->exact_type();
1406 if (exact_type == NULL &&
1407 receiver->as_Local() &&
1408 receiver->as_Local()->java_index() == 0) {
1409 ciInstanceKlass* ik = compilation()->method()->holder();
1410 if (ik->is_final()) {
1411 exact_type = ik;
1412 } else if (UseCHA && !(ik->has_subklass() || ik->is_interface())) {
1413 // test class is leaf class
1414 compilation()->dependency_recorder()->assert_leaf_type(ik);
1415 exact_type = ik;
1416 } else {
1417 declared_type = ik;
1418 }
1419 }
1421 // see if we know statically that registration isn't required
1422 bool needs_check = true;
1423 if (exact_type != NULL) {
1424 needs_check = exact_type->as_instance_klass()->has_finalizer();
1425 } else if (declared_type != NULL) {
1426 ciInstanceKlass* ik = declared_type->as_instance_klass();
1427 if (!Dependencies::has_finalizable_subclass(ik)) {
1428 compilation()->dependency_recorder()->assert_has_no_finalizable_subclasses(ik);
1429 needs_check = false;
1430 }
1431 }
1433 if (needs_check) {
1434 // Perform the registration of finalizable objects.
1435 ValueStack* state_before = copy_state_for_exception();
1436 load_local(objectType, 0);
1437 append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init,
1438 state()->pop_arguments(1),
1439 true, state_before, true));
1440 }
1441 }
1444 void GraphBuilder::method_return(Value x) {
1445 if (RegisterFinalizersAtInit &&
1446 method()->intrinsic_id() == vmIntrinsics::_Object_init) {
1447 call_register_finalizer();
1448 }
1450 bool need_mem_bar = false;
1451 if (method()->name() == ciSymbol::object_initializer_name() &&
1452 scope()->wrote_final()) {
1453 need_mem_bar = true;
1454 }
1456 BasicType bt = method()->return_type()->basic_type();
1457 switch (bt) {
1458 case T_BYTE:
1459 {
1460 Value shift = append(new Constant(new IntConstant(24)));
1461 x = append(new ShiftOp(Bytecodes::_ishl, x, shift));
1462 x = append(new ShiftOp(Bytecodes::_ishr, x, shift));
1463 break;
1464 }
1465 case T_SHORT:
1466 {
1467 Value shift = append(new Constant(new IntConstant(16)));
1468 x = append(new ShiftOp(Bytecodes::_ishl, x, shift));
1469 x = append(new ShiftOp(Bytecodes::_ishr, x, shift));
1470 break;
1471 }
1472 case T_CHAR:
1473 {
1474 Value mask = append(new Constant(new IntConstant(0xFFFF)));
1475 x = append(new LogicOp(Bytecodes::_iand, x, mask));
1476 break;
1477 }
1478 case T_BOOLEAN:
1479 {
1480 Value mask = append(new Constant(new IntConstant(1)));
1481 x = append(new LogicOp(Bytecodes::_iand, x, mask));
1482 break;
1483 }
1484 }
1486 // Check to see whether we are inlining. If so, Return
1487 // instructions become Gotos to the continuation point.
1488 if (continuation() != NULL) {
1490 int invoke_bci = state()->caller_state()->bci();
1492 if (x != NULL) {
1493 ciMethod* caller = state()->scope()->caller()->method();
1494 Bytecodes::Code invoke_raw_bc = caller->raw_code_at_bci(invoke_bci);
1495 if (invoke_raw_bc == Bytecodes::_invokehandle || invoke_raw_bc == Bytecodes::_invokedynamic) {
1496 ciType* declared_ret_type = caller->get_declared_signature_at_bci(invoke_bci)->return_type();
1497 if (declared_ret_type->is_klass() && x->exact_type() == NULL &&
1498 x->declared_type() != declared_ret_type && declared_ret_type != compilation()->env()->Object_klass()) {
1499 x = append(new TypeCast(declared_ret_type->as_klass(), x, copy_state_before()));
1500 }
1501 }
1502 }
1504 assert(!method()->is_synchronized() || InlineSynchronizedMethods, "can not inline synchronized methods yet");
1506 if (compilation()->env()->dtrace_method_probes()) {
1507 // Report exit from inline methods
1508 Values* args = new Values(1);
1509 args->push(append(new Constant(new MethodConstant(method()))));
1510 append(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args));
1511 }
1513 // If the inlined method is synchronized, the monitor must be
1514 // released before we jump to the continuation block.
1515 if (method()->is_synchronized()) {
1516 assert(state()->locks_size() == 1, "receiver must be locked here");
1517 monitorexit(state()->lock_at(0), SynchronizationEntryBCI);
1518 }
1520 if (need_mem_bar) {
1521 append(new MemBar(lir_membar_storestore));
1522 }
1524 // State at end of inlined method is the state of the caller
1525 // without the method parameters on stack, including the
1526 // return value, if any, of the inlined method on operand stack.
1527 set_state(state()->caller_state()->copy_for_parsing());
1528 if (x != NULL) {
1529 state()->push(x->type(), x);
1530 if (profile_return() && x->type()->is_object_kind()) {
1531 ciMethod* caller = state()->scope()->method();
1532 ciMethodData* md = caller->method_data_or_null();
1533 ciProfileData* data = md->bci_to_data(invoke_bci);
1534 if (data != NULL && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) {
1535 bool has_return = data->is_CallTypeData() ? ((ciCallTypeData*)data)->has_return() : ((ciVirtualCallTypeData*)data)->has_return();
1536 // May not be true in case of an inlined call through a method handle intrinsic.
1537 if (has_return) {
1538 profile_return_type(x, method(), caller, invoke_bci);
1539 }
1540 }
1541 }
1542 }
1543 Goto* goto_callee = new Goto(continuation(), false);
1545 // See whether this is the first return; if so, store off some
1546 // of the state for later examination
1547 if (num_returns() == 0) {
1548 set_inline_cleanup_info();
1549 }
1551 // The current bci() is in the wrong scope, so use the bci() of
1552 // the continuation point.
1553 append_with_bci(goto_callee, scope_data()->continuation()->bci());
1554 incr_num_returns();
1555 return;
1556 }
1558 state()->truncate_stack(0);
1559 if (method()->is_synchronized()) {
1560 // perform the unlocking before exiting the method
1561 Value receiver;
1562 if (!method()->is_static()) {
1563 receiver = _initial_state->local_at(0);
1564 } else {
1565 receiver = append(new Constant(new ClassConstant(method()->holder())));
1566 }
1567 append_split(new MonitorExit(receiver, state()->unlock()));
1568 }
1570 if (need_mem_bar) {
1571 append(new MemBar(lir_membar_storestore));
1572 }
1574 append(new Return(x));
1575 }
1578 void GraphBuilder::access_field(Bytecodes::Code code) {
1579 bool will_link;
1580 ciField* field = stream()->get_field(will_link);
1581 ciInstanceKlass* holder = field->holder();
1582 BasicType field_type = field->type()->basic_type();
1583 ValueType* type = as_ValueType(field_type);
1584 // call will_link again to determine if the field is valid.
1585 const bool needs_patching = !holder->is_loaded() ||
1586 !field->will_link(method()->holder(), code) ||
1587 PatchALot;
1589 ValueStack* state_before = NULL;
1590 if (!holder->is_initialized() || needs_patching) {
1591 // save state before instruction for debug info when
1592 // deoptimization happens during patching
1593 state_before = copy_state_before();
1594 }
1596 Value obj = NULL;
1597 if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) {
1598 if (state_before != NULL) {
1599 // build a patching constant
1600 obj = new Constant(new InstanceConstant(holder->java_mirror()), state_before);
1601 } else {
1602 obj = new Constant(new InstanceConstant(holder->java_mirror()));
1603 }
1604 }
1606 if (field->is_final() && (code == Bytecodes::_putfield)) {
1607 scope()->set_wrote_final();
1608 }
1610 const int offset = !needs_patching ? field->offset() : -1;
1611 switch (code) {
1612 case Bytecodes::_getstatic: {
1613 // check for compile-time constants, i.e., initialized static final fields
1614 Instruction* constant = NULL;
1615 if (field->is_constant() && !PatchALot) {
1616 ciConstant field_val = field->constant_value();
1617 BasicType field_type = field_val.basic_type();
1618 switch (field_type) {
1619 case T_ARRAY:
1620 case T_OBJECT:
1621 if (field_val.as_object()->should_be_constant()) {
1622 constant = new Constant(as_ValueType(field_val));
1623 }
1624 break;
1626 default:
1627 constant = new Constant(as_ValueType(field_val));
1628 }
1629 // Stable static fields are checked for non-default values in ciField::initialize_from().
1630 }
1631 if (constant != NULL) {
1632 push(type, append(constant));
1633 } else {
1634 if (state_before == NULL) {
1635 state_before = copy_state_for_exception();
1636 }
1637 push(type, append(new LoadField(append(obj), offset, field, true,
1638 state_before, needs_patching)));
1639 }
1640 break;
1641 }
1642 case Bytecodes::_putstatic:
1643 { Value val = pop(type);
1644 if (state_before == NULL) {
1645 state_before = copy_state_for_exception();
1646 }
1647 if (field->type()->basic_type() == T_BOOLEAN) {
1648 Value mask = append(new Constant(new IntConstant(1)));
1649 val = append(new LogicOp(Bytecodes::_iand, val, mask));
1650 }
1651 append(new StoreField(append(obj), offset, field, val, true, state_before, needs_patching));
1652 }
1653 break;
1654 case Bytecodes::_getfield: {
1655 // Check for compile-time constants, i.e., trusted final non-static fields.
1656 Instruction* constant = NULL;
1657 obj = apop();
1658 ObjectType* obj_type = obj->type()->as_ObjectType();
1659 if (obj_type->is_constant() && !PatchALot) {
1660 ciObject* const_oop = obj_type->constant_value();
1661 if (!const_oop->is_null_object() && const_oop->is_loaded()) {
1662 if (field->is_constant()) {
1663 ciConstant field_val = field->constant_value_of(const_oop);
1664 BasicType field_type = field_val.basic_type();
1665 switch (field_type) {
1666 case T_ARRAY:
1667 case T_OBJECT:
1668 if (field_val.as_object()->should_be_constant()) {
1669 constant = new Constant(as_ValueType(field_val));
1670 }
1671 break;
1672 default:
1673 constant = new Constant(as_ValueType(field_val));
1674 }
1675 if (FoldStableValues && field->is_stable() && field_val.is_null_or_zero()) {
1676 // Stable field with default value can't be constant.
1677 constant = NULL;
1678 }
1679 } else {
1680 // For CallSite objects treat the target field as a compile time constant.
1681 if (const_oop->is_call_site()) {
1682 ciCallSite* call_site = const_oop->as_call_site();
1683 if (field->is_call_site_target()) {
1684 ciMethodHandle* target = call_site->get_target();
1685 if (target != NULL) { // just in case
1686 ciConstant field_val(T_OBJECT, target);
1687 constant = new Constant(as_ValueType(field_val));
1688 // Add a dependence for invalidation of the optimization.
1689 if (!call_site->is_constant_call_site()) {
1690 dependency_recorder()->assert_call_site_target_value(call_site, target);
1691 }
1692 }
1693 }
1694 }
1695 }
1696 }
1697 }
1698 if (constant != NULL) {
1699 push(type, append(constant));
1700 } else {
1701 if (state_before == NULL) {
1702 state_before = copy_state_for_exception();
1703 }
1704 LoadField* load = new LoadField(obj, offset, field, false, state_before, needs_patching);
1705 Value replacement = !needs_patching ? _memory->load(load) : load;
1706 if (replacement != load) {
1707 assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked");
1708 // Writing an (integer) value to a boolean, byte, char or short field includes an implicit narrowing
1709 // conversion. Emit an explicit conversion here to get the correct field value after the write.
1710 BasicType bt = field->type()->basic_type();
1711 switch (bt) {
1712 case T_BOOLEAN:
1713 case T_BYTE:
1714 replacement = append(new Convert(Bytecodes::_i2b, replacement, as_ValueType(bt)));
1715 break;
1716 case T_CHAR:
1717 replacement = append(new Convert(Bytecodes::_i2c, replacement, as_ValueType(bt)));
1718 break;
1719 case T_SHORT:
1720 replacement = append(new Convert(Bytecodes::_i2s, replacement, as_ValueType(bt)));
1721 break;
1722 default:
1723 break;
1724 }
1725 push(type, replacement);
1726 } else {
1727 push(type, append(load));
1728 }
1729 }
1730 break;
1731 }
1732 case Bytecodes::_putfield: {
1733 Value val = pop(type);
1734 obj = apop();
1735 if (state_before == NULL) {
1736 state_before = copy_state_for_exception();
1737 }
1738 if (field->type()->basic_type() == T_BOOLEAN) {
1739 Value mask = append(new Constant(new IntConstant(1)));
1740 val = append(new LogicOp(Bytecodes::_iand, val, mask));
1741 }
1742 StoreField* store = new StoreField(obj, offset, field, val, false, state_before, needs_patching);
1743 if (!needs_patching) store = _memory->store(store);
1744 if (store != NULL) {
1745 append(store);
1746 }
1747 break;
1748 }
1749 default:
1750 ShouldNotReachHere();
1751 break;
1752 }
1753 }
1756 Dependencies* GraphBuilder::dependency_recorder() const {
1757 assert(DeoptC1, "need debug information");
1758 return compilation()->dependency_recorder();
1759 }
1761 // How many arguments do we want to profile?
1762 Values* GraphBuilder::args_list_for_profiling(ciMethod* target, int& start, bool may_have_receiver) {
1763 int n = 0;
1764 bool has_receiver = may_have_receiver && Bytecodes::has_receiver(method()->java_code_at_bci(bci()));
1765 start = has_receiver ? 1 : 0;
1766 if (profile_arguments()) {
1767 ciProfileData* data = method()->method_data()->bci_to_data(bci());
1768 if (data != NULL && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) {
1769 n = data->is_CallTypeData() ? data->as_CallTypeData()->number_of_arguments() : data->as_VirtualCallTypeData()->number_of_arguments();
1770 }
1771 }
1772 // If we are inlining then we need to collect arguments to profile parameters for the target
1773 if (profile_parameters() && target != NULL) {
1774 if (target->method_data() != NULL && target->method_data()->parameters_type_data() != NULL) {
1775 // The receiver is profiled on method entry so it's included in
1776 // the number of parameters but here we're only interested in
1777 // actual arguments.
1778 n = MAX2(n, target->method_data()->parameters_type_data()->number_of_parameters() - start);
1779 }
1780 }
1781 if (n > 0) {
1782 return new Values(n);
1783 }
1784 return NULL;
1785 }
1787 void GraphBuilder::check_args_for_profiling(Values* obj_args, int expected) {
1788 #ifdef ASSERT
1789 bool ignored_will_link;
1790 ciSignature* declared_signature = NULL;
1791 ciMethod* real_target = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature);
1792 assert(expected == obj_args->length() || real_target->is_method_handle_intrinsic(), "missed on arg?");
1793 #endif
1794 }
1796 // Collect arguments that we want to profile in a list
1797 Values* GraphBuilder::collect_args_for_profiling(Values* args, ciMethod* target, bool may_have_receiver) {
1798 int start = 0;
1799 Values* obj_args = args_list_for_profiling(target, start, may_have_receiver);
1800 if (obj_args == NULL) {
1801 return NULL;
1802 }
1803 int s = obj_args->size();
1804 // if called through method handle invoke, some arguments may have been popped
1805 for (int i = start, j = 0; j < s && i < args->length(); i++) {
1806 if (args->at(i)->type()->is_object_kind()) {
1807 obj_args->push(args->at(i));
1808 j++;
1809 }
1810 }
1811 check_args_for_profiling(obj_args, s);
1812 return obj_args;
1813 }
1816 void GraphBuilder::invoke(Bytecodes::Code code) {
1817 bool will_link;
1818 ciSignature* declared_signature = NULL;
1819 ciMethod* target = stream()->get_method(will_link, &declared_signature);
1820 ciKlass* holder = stream()->get_declared_method_holder();
1821 const Bytecodes::Code bc_raw = stream()->cur_bc_raw();
1822 assert(declared_signature != NULL, "cannot be null");
1824 if (!C1PatchInvokeDynamic && Bytecodes::has_optional_appendix(bc_raw) && !will_link) {
1825 BAILOUT("unlinked call site (C1PatchInvokeDynamic is off)");
1826 }
1828 // we have to make sure the argument size (incl. the receiver)
1829 // is correct for compilation (the call would fail later during
1830 // linkage anyway) - was bug (gri 7/28/99)
1831 {
1832 // Use raw to get rewritten bytecode.
1833 const bool is_invokestatic = bc_raw == Bytecodes::_invokestatic;
1834 const bool allow_static =
1835 is_invokestatic ||
1836 bc_raw == Bytecodes::_invokehandle ||
1837 bc_raw == Bytecodes::_invokedynamic;
1838 if (target->is_loaded()) {
1839 if (( target->is_static() && !allow_static) ||
1840 (!target->is_static() && is_invokestatic)) {
1841 BAILOUT("will cause link error");
1842 }
1843 }
1844 }
1845 ciInstanceKlass* klass = target->holder();
1847 // check if CHA possible: if so, change the code to invoke_special
1848 ciInstanceKlass* calling_klass = method()->holder();
1849 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder);
1850 ciInstanceKlass* actual_recv = callee_holder;
1852 CompileLog* log = compilation()->log();
1853 if (log != NULL)
1854 log->elem("call method='%d' instr='%s'",
1855 log->identify(target),
1856 Bytecodes::name(code));
1858 // invoke-special-super
1859 if (bc_raw == Bytecodes::_invokespecial && !target->is_object_initializer()) {
1860 ciInstanceKlass* sender_klass =
1861 calling_klass->is_anonymous() ? calling_klass->host_klass() :
1862 calling_klass;
1863 if (sender_klass->is_interface()) {
1864 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
1865 Value receiver = state()->stack_at(index);
1866 CheckCast* c = new CheckCast(sender_klass, receiver, copy_state_before());
1867 c->set_invokespecial_receiver_check();
1868 state()->stack_at_put(index, append_split(c));
1869 }
1870 }
1872 // Some methods are obviously bindable without any type checks so
1873 // convert them directly to an invokespecial or invokestatic.
1874 if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) {
1875 switch (bc_raw) {
1876 case Bytecodes::_invokevirtual:
1877 code = Bytecodes::_invokespecial;
1878 break;
1879 case Bytecodes::_invokehandle:
1880 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial;
1881 break;
1882 }
1883 } else {
1884 if (bc_raw == Bytecodes::_invokehandle) {
1885 assert(!will_link, "should come here only for unlinked call");
1886 code = Bytecodes::_invokespecial;
1887 }
1888 }
1890 // Push appendix argument (MethodType, CallSite, etc.), if one.
1891 bool patch_for_appendix = false;
1892 int patching_appendix_arg = 0;
1893 if (C1PatchInvokeDynamic &&
1894 (Bytecodes::has_optional_appendix(bc_raw) && (!will_link || PatchALot))) {
1895 Value arg = append(new Constant(new ObjectConstant(compilation()->env()->unloaded_ciinstance()), copy_state_before()));
1896 apush(arg);
1897 patch_for_appendix = true;
1898 patching_appendix_arg = (will_link && stream()->has_appendix()) ? 0 : 1;
1899 } else if (stream()->has_appendix()) {
1900 ciObject* appendix = stream()->get_appendix();
1901 Value arg = append(new Constant(new ObjectConstant(appendix)));
1902 apush(arg);
1903 }
1905 // NEEDS_CLEANUP
1906 // I've added the target->is_loaded() test below but I don't really understand
1907 // how klass->is_loaded() can be true and yet target->is_loaded() is false.
1908 // this happened while running the JCK invokevirtual tests under doit. TKR
1909 ciMethod* cha_monomorphic_target = NULL;
1910 ciMethod* exact_target = NULL;
1911 Value better_receiver = NULL;
1912 if (UseCHA && DeoptC1 && klass->is_loaded() && target->is_loaded() &&
1913 !(// %%% FIXME: Are both of these relevant?
1914 target->is_method_handle_intrinsic() ||
1915 target->is_compiled_lambda_form()) &&
1916 !patch_for_appendix) {
1917 Value receiver = NULL;
1918 ciInstanceKlass* receiver_klass = NULL;
1919 bool type_is_exact = false;
1920 // try to find a precise receiver type
1921 if (will_link && !target->is_static()) {
1922 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
1923 receiver = state()->stack_at(index);
1924 ciType* type = receiver->exact_type();
1925 if (type != NULL && type->is_loaded() &&
1926 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
1927 receiver_klass = (ciInstanceKlass*) type;
1928 type_is_exact = true;
1929 }
1930 if (type == NULL) {
1931 type = receiver->declared_type();
1932 if (type != NULL && type->is_loaded() &&
1933 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
1934 receiver_klass = (ciInstanceKlass*) type;
1935 if (receiver_klass->is_leaf_type() && !receiver_klass->is_final()) {
1936 // Insert a dependency on this type since
1937 // find_monomorphic_target may assume it's already done.
1938 dependency_recorder()->assert_leaf_type(receiver_klass);
1939 type_is_exact = true;
1940 }
1941 }
1942 }
1943 }
1944 if (receiver_klass != NULL && type_is_exact &&
1945 receiver_klass->is_loaded() && code != Bytecodes::_invokespecial) {
1946 // If we have the exact receiver type we can bind directly to
1947 // the method to call.
1948 exact_target = target->resolve_invoke(calling_klass, receiver_klass);
1949 if (exact_target != NULL) {
1950 target = exact_target;
1951 code = Bytecodes::_invokespecial;
1952 }
1953 }
1954 if (receiver_klass != NULL &&
1955 receiver_klass->is_subtype_of(actual_recv) &&
1956 actual_recv->is_initialized()) {
1957 actual_recv = receiver_klass;
1958 }
1960 if ((code == Bytecodes::_invokevirtual && callee_holder->is_initialized()) ||
1961 (code == Bytecodes::_invokeinterface && callee_holder->is_initialized() && !actual_recv->is_interface())) {
1962 // Use CHA on the receiver to select a more precise method.
1963 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv);
1964 } else if (code == Bytecodes::_invokeinterface && callee_holder->is_loaded() && receiver != NULL) {
1965 // if there is only one implementor of this interface then we
1966 // may be able bind this invoke directly to the implementing
1967 // klass but we need both a dependence on the single interface
1968 // and on the method we bind to. Additionally since all we know
1969 // about the receiver type is the it's supposed to implement the
1970 // interface we have to insert a check that it's the class we
1971 // expect. Interface types are not checked by the verifier so
1972 // they are roughly equivalent to Object.
1973 ciInstanceKlass* singleton = NULL;
1974 if (target->holder()->nof_implementors() == 1) {
1975 singleton = target->holder()->implementor();
1976 assert(singleton != NULL && singleton != target->holder(),
1977 "just checking");
1979 assert(holder->is_interface(), "invokeinterface to non interface?");
1980 ciInstanceKlass* decl_interface = (ciInstanceKlass*)holder;
1981 // the number of implementors for decl_interface is less or
1982 // equal to the number of implementors for target->holder() so
1983 // if number of implementors of target->holder() == 1 then
1984 // number of implementors for decl_interface is 0 or 1. If
1985 // it's 0 then no class implements decl_interface and there's
1986 // no point in inlining.
1987 if (!holder->is_loaded() || decl_interface->nof_implementors() != 1 || decl_interface->has_default_methods()) {
1988 singleton = NULL;
1989 }
1990 }
1991 if (singleton) {
1992 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, target->holder(), singleton);
1993 if (cha_monomorphic_target != NULL) {
1994 // If CHA is able to bind this invoke then update the class
1995 // to match that class, otherwise klass will refer to the
1996 // interface.
1997 klass = cha_monomorphic_target->holder();
1998 actual_recv = target->holder();
2000 // insert a check it's really the expected class.
2001 CheckCast* c = new CheckCast(klass, receiver, copy_state_for_exception());
2002 c->set_incompatible_class_change_check();
2003 c->set_direct_compare(klass->is_final());
2004 // pass the result of the checkcast so that the compiler has
2005 // more accurate type info in the inlinee
2006 better_receiver = append_split(c);
2007 }
2008 }
2009 }
2010 }
2012 if (cha_monomorphic_target != NULL) {
2013 if (cha_monomorphic_target->is_abstract()) {
2014 // Do not optimize for abstract methods
2015 cha_monomorphic_target = NULL;
2016 }
2017 }
2019 if (cha_monomorphic_target != NULL) {
2020 if (!(target->is_final_method())) {
2021 // If we inlined because CHA revealed only a single target method,
2022 // then we are dependent on that target method not getting overridden
2023 // by dynamic class loading. Be sure to test the "static" receiver
2024 // dest_method here, as opposed to the actual receiver, which may
2025 // falsely lead us to believe that the receiver is final or private.
2026 dependency_recorder()->assert_unique_concrete_method(actual_recv, cha_monomorphic_target);
2027 }
2028 code = Bytecodes::_invokespecial;
2029 }
2031 // check if we could do inlining
2032 if (!PatchALot && Inline && klass->is_loaded() &&
2033 (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized())
2034 && target->is_loaded()
2035 && !patch_for_appendix) {
2036 // callee is known => check if we have static binding
2037 assert(target->is_loaded(), "callee must be known");
2038 if (code == Bytecodes::_invokestatic ||
2039 code == Bytecodes::_invokespecial ||
2040 code == Bytecodes::_invokevirtual && target->is_final_method() ||
2041 code == Bytecodes::_invokedynamic) {
2042 ciMethod* inline_target = (cha_monomorphic_target != NULL) ? cha_monomorphic_target : target;
2043 // static binding => check if callee is ok
2044 bool success = try_inline(inline_target, (cha_monomorphic_target != NULL) || (exact_target != NULL), code, better_receiver);
2046 CHECK_BAILOUT();
2047 clear_inline_bailout();
2049 if (success) {
2050 // Register dependence if JVMTI has either breakpoint
2051 // setting or hotswapping of methods capabilities since they may
2052 // cause deoptimization.
2053 if (compilation()->env()->jvmti_can_hotswap_or_post_breakpoint()) {
2054 dependency_recorder()->assert_evol_method(inline_target);
2055 }
2056 return;
2057 }
2058 } else {
2059 print_inlining(target, "no static binding", /*success*/ false);
2060 }
2061 } else {
2062 print_inlining(target, "not inlineable", /*success*/ false);
2063 }
2065 // If we attempted an inline which did not succeed because of a
2066 // bailout during construction of the callee graph, the entire
2067 // compilation has to be aborted. This is fairly rare and currently
2068 // seems to only occur for jasm-generated classes which contain
2069 // jsr/ret pairs which are not associated with finally clauses and
2070 // do not have exception handlers in the containing method, and are
2071 // therefore not caught early enough to abort the inlining without
2072 // corrupting the graph. (We currently bail out with a non-empty
2073 // stack at a ret in these situations.)
2074 CHECK_BAILOUT();
2076 // inlining not successful => standard invoke
2077 bool is_loaded = target->is_loaded();
2078 ValueType* result_type = as_ValueType(declared_signature->return_type());
2079 ValueStack* state_before = copy_state_exhandling();
2081 // The bytecode (code) might change in this method so we are checking this very late.
2082 const bool has_receiver =
2083 code == Bytecodes::_invokespecial ||
2084 code == Bytecodes::_invokevirtual ||
2085 code == Bytecodes::_invokeinterface;
2086 Values* args = state()->pop_arguments(target->arg_size_no_receiver() + patching_appendix_arg);
2087 Value recv = has_receiver ? apop() : NULL;
2088 int vtable_index = Method::invalid_vtable_index;
2090 #ifdef SPARC
2091 // Currently only supported on Sparc.
2092 // The UseInlineCaches only controls dispatch to invokevirtuals for
2093 // loaded classes which we weren't able to statically bind.
2094 if (!UseInlineCaches && is_loaded && code == Bytecodes::_invokevirtual
2095 && !target->can_be_statically_bound()) {
2096 // Find a vtable index if one is available
2097 // For arrays, callee_holder is Object. Resolving the call with
2098 // Object would allow an illegal call to finalize() on an
2099 // array. We use holder instead: illegal calls to finalize() won't
2100 // be compiled as vtable calls (IC call resolution will catch the
2101 // illegal call) and the few legal calls on array types won't be
2102 // either.
2103 vtable_index = target->resolve_vtable_index(calling_klass, holder);
2104 }
2105 #endif
2107 if (recv != NULL &&
2108 (code == Bytecodes::_invokespecial ||
2109 !is_loaded || target->is_final())) {
2110 // invokespecial always needs a NULL check. invokevirtual where
2111 // the target is final or where it's not known that whether the
2112 // target is final requires a NULL check. Otherwise normal
2113 // invokevirtual will perform the null check during the lookup
2114 // logic or the unverified entry point. Profiling of calls
2115 // requires that the null check is performed in all cases.
2116 null_check(recv);
2117 }
2119 if (is_profiling()) {
2120 if (recv != NULL && profile_calls()) {
2121 null_check(recv);
2122 }
2123 // Note that we'd collect profile data in this method if we wanted it.
2124 compilation()->set_would_profile(true);
2126 if (profile_calls()) {
2127 assert(cha_monomorphic_target == NULL || exact_target == NULL, "both can not be set");
2128 ciKlass* target_klass = NULL;
2129 if (cha_monomorphic_target != NULL) {
2130 target_klass = cha_monomorphic_target->holder();
2131 } else if (exact_target != NULL) {
2132 target_klass = exact_target->holder();
2133 }
2134 profile_call(target, recv, target_klass, collect_args_for_profiling(args, NULL, false), false);
2135 }
2136 }
2138 Invoke* result = new Invoke(code, result_type, recv, args, vtable_index, target, state_before);
2139 // push result
2140 append_split(result);
2142 if (result_type != voidType) {
2143 if (method()->is_strict()) {
2144 push(result_type, round_fp(result));
2145 } else {
2146 push(result_type, result);
2147 }
2148 }
2149 if (profile_return() && result_type->is_object_kind()) {
2150 profile_return_type(result, target);
2151 }
2152 }
2155 void GraphBuilder::new_instance(int klass_index) {
2156 ValueStack* state_before = copy_state_exhandling();
2157 bool will_link;
2158 ciKlass* klass = stream()->get_klass(will_link);
2159 assert(klass->is_instance_klass(), "must be an instance klass");
2160 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before, stream()->is_unresolved_klass());
2161 _memory->new_instance(new_instance);
2162 apush(append_split(new_instance));
2163 }
2166 void GraphBuilder::new_type_array() {
2167 ValueStack* state_before = copy_state_exhandling();
2168 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before)));
2169 }
2172 void GraphBuilder::new_object_array() {
2173 bool will_link;
2174 ciKlass* klass = stream()->get_klass(will_link);
2175 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2176 NewArray* n = new NewObjectArray(klass, ipop(), state_before);
2177 apush(append_split(n));
2178 }
2181 bool GraphBuilder::direct_compare(ciKlass* k) {
2182 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) {
2183 ciInstanceKlass* ik = k->as_instance_klass();
2184 if (ik->is_final()) {
2185 return true;
2186 } else {
2187 if (DeoptC1 && UseCHA && !(ik->has_subklass() || ik->is_interface())) {
2188 // test class is leaf class
2189 dependency_recorder()->assert_leaf_type(ik);
2190 return true;
2191 }
2192 }
2193 }
2194 return false;
2195 }
2198 void GraphBuilder::check_cast(int klass_index) {
2199 bool will_link;
2200 ciKlass* klass = stream()->get_klass(will_link);
2201 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_for_exception();
2202 CheckCast* c = new CheckCast(klass, apop(), state_before);
2203 apush(append_split(c));
2204 c->set_direct_compare(direct_compare(klass));
2206 if (is_profiling()) {
2207 // Note that we'd collect profile data in this method if we wanted it.
2208 compilation()->set_would_profile(true);
2210 if (profile_checkcasts()) {
2211 c->set_profiled_method(method());
2212 c->set_profiled_bci(bci());
2213 c->set_should_profile(true);
2214 }
2215 }
2216 }
2219 void GraphBuilder::instance_of(int klass_index) {
2220 bool will_link;
2221 ciKlass* klass = stream()->get_klass(will_link);
2222 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2223 InstanceOf* i = new InstanceOf(klass, apop(), state_before);
2224 ipush(append_split(i));
2225 i->set_direct_compare(direct_compare(klass));
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);
2231 if (profile_checkcasts()) {
2232 i->set_profiled_method(method());
2233 i->set_profiled_bci(bci());
2234 i->set_should_profile(true);
2235 }
2236 }
2237 }
2240 void GraphBuilder::monitorenter(Value x, int bci) {
2241 // save state before locking in case of deoptimization after a NullPointerException
2242 ValueStack* state_before = copy_state_for_exception_with_bci(bci);
2243 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before), bci);
2244 kill_all();
2245 }
2248 void GraphBuilder::monitorexit(Value x, int bci) {
2249 append_with_bci(new MonitorExit(x, state()->unlock()), bci);
2250 kill_all();
2251 }
2254 void GraphBuilder::new_multi_array(int dimensions) {
2255 bool will_link;
2256 ciKlass* klass = stream()->get_klass(will_link);
2257 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2259 Values* dims = new Values(dimensions, NULL);
2260 // fill in all dimensions
2261 int i = dimensions;
2262 while (i-- > 0) dims->at_put(i, ipop());
2263 // create array
2264 NewArray* n = new NewMultiArray(klass, dims, state_before);
2265 apush(append_split(n));
2266 }
2269 void GraphBuilder::throw_op(int bci) {
2270 // We require that the debug info for a Throw be the "state before"
2271 // the Throw (i.e., exception oop is still on TOS)
2272 ValueStack* state_before = copy_state_before_with_bci(bci);
2273 Throw* t = new Throw(apop(), state_before);
2274 // operand stack not needed after a throw
2275 state()->truncate_stack(0);
2276 append_with_bci(t, bci);
2277 }
2280 Value GraphBuilder::round_fp(Value fp_value) {
2281 // no rounding needed if SSE2 is used
2282 if (RoundFPResults && UseSSE < 2) {
2283 // Must currently insert rounding node for doubleword values that
2284 // are results of expressions (i.e., not loads from memory or
2285 // constants)
2286 if (fp_value->type()->tag() == doubleTag &&
2287 fp_value->as_Constant() == NULL &&
2288 fp_value->as_Local() == NULL && // method parameters need no rounding
2289 fp_value->as_RoundFP() == NULL) {
2290 return append(new RoundFP(fp_value));
2291 }
2292 }
2293 return fp_value;
2294 }
2297 Instruction* GraphBuilder::append_with_bci(Instruction* instr, int bci) {
2298 Canonicalizer canon(compilation(), instr, bci);
2299 Instruction* i1 = canon.canonical();
2300 if (i1->is_linked() || !i1->can_be_linked()) {
2301 // Canonicalizer returned an instruction which was already
2302 // appended so simply return it.
2303 return i1;
2304 }
2306 if (UseLocalValueNumbering) {
2307 // Lookup the instruction in the ValueMap and add it to the map if
2308 // it's not found.
2309 Instruction* i2 = vmap()->find_insert(i1);
2310 if (i2 != i1) {
2311 // found an entry in the value map, so just return it.
2312 assert(i2->is_linked(), "should already be linked");
2313 return i2;
2314 }
2315 ValueNumberingEffects vne(vmap());
2316 i1->visit(&vne);
2317 }
2319 // i1 was not eliminated => append it
2320 assert(i1->next() == NULL, "shouldn't already be linked");
2321 _last = _last->set_next(i1, canon.bci());
2323 if (++_instruction_count >= InstructionCountCutoff && !bailed_out()) {
2324 // set the bailout state but complete normal processing. We
2325 // might do a little more work before noticing the bailout so we
2326 // want processing to continue normally until it's noticed.
2327 bailout("Method and/or inlining is too large");
2328 }
2330 #ifndef PRODUCT
2331 if (PrintIRDuringConstruction) {
2332 InstructionPrinter ip;
2333 ip.print_line(i1);
2334 if (Verbose) {
2335 state()->print();
2336 }
2337 }
2338 #endif
2340 // save state after modification of operand stack for StateSplit instructions
2341 StateSplit* s = i1->as_StateSplit();
2342 if (s != NULL) {
2343 if (EliminateFieldAccess) {
2344 Intrinsic* intrinsic = s->as_Intrinsic();
2345 if (s->as_Invoke() != NULL || (intrinsic && !intrinsic->preserves_state())) {
2346 _memory->kill();
2347 }
2348 }
2349 s->set_state(state()->copy(ValueStack::StateAfter, canon.bci()));
2350 }
2352 // set up exception handlers for this instruction if necessary
2353 if (i1->can_trap()) {
2354 i1->set_exception_handlers(handle_exception(i1));
2355 assert(i1->exception_state() != NULL || !i1->needs_exception_state() || bailed_out(), "handle_exception must set exception state");
2356 }
2357 return i1;
2358 }
2361 Instruction* GraphBuilder::append(Instruction* instr) {
2362 assert(instr->as_StateSplit() == NULL || instr->as_BlockEnd() != NULL, "wrong append used");
2363 return append_with_bci(instr, bci());
2364 }
2367 Instruction* GraphBuilder::append_split(StateSplit* instr) {
2368 return append_with_bci(instr, bci());
2369 }
2372 void GraphBuilder::null_check(Value value) {
2373 if (value->as_NewArray() != NULL || value->as_NewInstance() != NULL) {
2374 return;
2375 } else {
2376 Constant* con = value->as_Constant();
2377 if (con) {
2378 ObjectType* c = con->type()->as_ObjectType();
2379 if (c && c->is_loaded()) {
2380 ObjectConstant* oc = c->as_ObjectConstant();
2381 if (!oc || !oc->value()->is_null_object()) {
2382 return;
2383 }
2384 }
2385 }
2386 }
2387 append(new NullCheck(value, copy_state_for_exception()));
2388 }
2392 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) {
2393 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != NULL)) {
2394 assert(instruction->exception_state() == NULL
2395 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState
2396 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->should_retain_local_variables()),
2397 "exception_state should be of exception kind");
2398 return new XHandlers();
2399 }
2401 XHandlers* exception_handlers = new XHandlers();
2402 ScopeData* cur_scope_data = scope_data();
2403 ValueStack* cur_state = instruction->state_before();
2404 ValueStack* prev_state = NULL;
2405 int scope_count = 0;
2407 assert(cur_state != NULL, "state_before must be set");
2408 do {
2409 int cur_bci = cur_state->bci();
2410 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2411 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci(), "invalid bci");
2413 // join with all potential exception handlers
2414 XHandlers* list = cur_scope_data->xhandlers();
2415 const int n = list->length();
2416 for (int i = 0; i < n; i++) {
2417 XHandler* h = list->handler_at(i);
2418 if (h->covers(cur_bci)) {
2419 // h is a potential exception handler => join it
2420 compilation()->set_has_exception_handlers(true);
2422 BlockBegin* entry = h->entry_block();
2423 if (entry == block()) {
2424 // It's acceptable for an exception handler to cover itself
2425 // but we don't handle that in the parser currently. It's
2426 // very rare so we bailout instead of trying to handle it.
2427 BAILOUT_("exception handler covers itself", exception_handlers);
2428 }
2429 assert(entry->bci() == h->handler_bci(), "must match");
2430 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond");
2432 // previously this was a BAILOUT, but this is not necessary
2433 // now because asynchronous exceptions are not handled this way.
2434 assert(entry->state() == NULL || cur_state->total_locks_size() == entry->state()->total_locks_size(), "locks do not match");
2436 // xhandler start with an empty expression stack
2437 if (cur_state->stack_size() != 0) {
2438 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
2439 }
2440 if (instruction->exception_state() == NULL) {
2441 instruction->set_exception_state(cur_state);
2442 }
2444 // Note: Usually this join must work. However, very
2445 // complicated jsr-ret structures where we don't ret from
2446 // the subroutine can cause the objects on the monitor
2447 // stacks to not match because blocks can be parsed twice.
2448 // The only test case we've seen so far which exhibits this
2449 // problem is caught by the infinite recursion test in
2450 // GraphBuilder::jsr() if the join doesn't work.
2451 if (!entry->try_merge(cur_state)) {
2452 BAILOUT_("error while joining with exception handler, prob. due to complicated jsr/rets", exception_handlers);
2453 }
2455 // add current state for correct handling of phi functions at begin of xhandler
2456 int phi_operand = entry->add_exception_state(cur_state);
2458 // add entry to the list of xhandlers of this block
2459 _block->add_exception_handler(entry);
2461 // add back-edge from xhandler entry to this block
2462 if (!entry->is_predecessor(_block)) {
2463 entry->add_predecessor(_block);
2464 }
2466 // clone XHandler because phi_operand and scope_count can not be shared
2467 XHandler* new_xhandler = new XHandler(h);
2468 new_xhandler->set_phi_operand(phi_operand);
2469 new_xhandler->set_scope_count(scope_count);
2470 exception_handlers->append(new_xhandler);
2472 // fill in exception handler subgraph lazily
2473 assert(!entry->is_set(BlockBegin::was_visited_flag), "entry must not be visited yet");
2474 cur_scope_data->add_to_work_list(entry);
2476 // stop when reaching catchall
2477 if (h->catch_type() == 0) {
2478 return exception_handlers;
2479 }
2480 }
2481 }
2483 if (exception_handlers->length() == 0) {
2484 // This scope and all callees do not handle exceptions, so the local
2485 // variables of this scope are not needed. However, the scope itself is
2486 // required for a correct exception stack trace -> clear out the locals.
2487 if (_compilation->env()->should_retain_local_variables()) {
2488 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
2489 } else {
2490 cur_state = cur_state->copy(ValueStack::EmptyExceptionState, cur_state->bci());
2491 }
2492 if (prev_state != NULL) {
2493 prev_state->set_caller_state(cur_state);
2494 }
2495 if (instruction->exception_state() == NULL) {
2496 instruction->set_exception_state(cur_state);
2497 }
2498 }
2500 // Set up iteration for next time.
2501 // If parsing a jsr, do not grab exception handlers from the
2502 // parent scopes for this method (already got them, and they
2503 // needed to be cloned)
2505 while (cur_scope_data->parsing_jsr()) {
2506 cur_scope_data = cur_scope_data->parent();
2507 }
2509 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2510 assert(cur_state->locks_size() == 0 || cur_state->locks_size() == 1, "unlocking must be done in a catchall exception handler");
2512 prev_state = cur_state;
2513 cur_state = cur_state->caller_state();
2514 cur_scope_data = cur_scope_data->parent();
2515 scope_count++;
2516 } while (cur_scope_data != NULL);
2518 return exception_handlers;
2519 }
2522 // Helper class for simplifying Phis.
2523 class PhiSimplifier : public BlockClosure {
2524 private:
2525 bool _has_substitutions;
2526 Value simplify(Value v);
2528 public:
2529 PhiSimplifier(BlockBegin* start) : _has_substitutions(false) {
2530 start->iterate_preorder(this);
2531 if (_has_substitutions) {
2532 SubstitutionResolver sr(start);
2533 }
2534 }
2535 void block_do(BlockBegin* b);
2536 bool has_substitutions() const { return _has_substitutions; }
2537 };
2540 Value PhiSimplifier::simplify(Value v) {
2541 Phi* phi = v->as_Phi();
2543 if (phi == NULL) {
2544 // no phi function
2545 return v;
2546 } else if (v->has_subst()) {
2547 // already substituted; subst can be phi itself -> simplify
2548 return simplify(v->subst());
2549 } else if (phi->is_set(Phi::cannot_simplify)) {
2550 // already tried to simplify phi before
2551 return phi;
2552 } else if (phi->is_set(Phi::visited)) {
2553 // break cycles in phi functions
2554 return phi;
2555 } else if (phi->type()->is_illegal()) {
2556 // illegal phi functions are ignored anyway
2557 return phi;
2559 } else {
2560 // mark phi function as processed to break cycles in phi functions
2561 phi->set(Phi::visited);
2563 // simplify x = [y, x] and x = [y, y] to y
2564 Value subst = NULL;
2565 int opd_count = phi->operand_count();
2566 for (int i = 0; i < opd_count; i++) {
2567 Value opd = phi->operand_at(i);
2568 assert(opd != NULL, "Operand must exist!");
2570 if (opd->type()->is_illegal()) {
2571 // if one operand is illegal, the entire phi function is illegal
2572 phi->make_illegal();
2573 phi->clear(Phi::visited);
2574 return phi;
2575 }
2577 Value new_opd = simplify(opd);
2578 assert(new_opd != NULL, "Simplified operand must exist!");
2580 if (new_opd != phi && new_opd != subst) {
2581 if (subst == NULL) {
2582 subst = new_opd;
2583 } else {
2584 // no simplification possible
2585 phi->set(Phi::cannot_simplify);
2586 phi->clear(Phi::visited);
2587 return phi;
2588 }
2589 }
2590 }
2592 // sucessfully simplified phi function
2593 assert(subst != NULL, "illegal phi function");
2594 _has_substitutions = true;
2595 phi->clear(Phi::visited);
2596 phi->set_subst(subst);
2598 #ifndef PRODUCT
2599 if (PrintPhiFunctions) {
2600 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());
2601 }
2602 #endif
2604 return subst;
2605 }
2606 }
2609 void PhiSimplifier::block_do(BlockBegin* b) {
2610 for_each_phi_fun(b, phi,
2611 simplify(phi);
2612 );
2614 #ifdef ASSERT
2615 for_each_phi_fun(b, phi,
2616 assert(phi->operand_count() != 1 || phi->subst() != phi, "missed trivial simplification");
2617 );
2619 ValueStack* state = b->state()->caller_state();
2620 for_each_state_value(state, value,
2621 Phi* phi = value->as_Phi();
2622 assert(phi == NULL || phi->block() != b, "must not have phi function to simplify in caller state");
2623 );
2624 #endif
2625 }
2627 // This method is called after all blocks are filled with HIR instructions
2628 // It eliminates all Phi functions of the form x = [y, y] and x = [y, x]
2629 void GraphBuilder::eliminate_redundant_phis(BlockBegin* start) {
2630 PhiSimplifier simplifier(start);
2631 }
2634 void GraphBuilder::connect_to_end(BlockBegin* beg) {
2635 // setup iteration
2636 kill_all();
2637 _block = beg;
2638 _state = beg->state()->copy_for_parsing();
2639 _last = beg;
2640 iterate_bytecodes_for_block(beg->bci());
2641 }
2644 BlockEnd* GraphBuilder::iterate_bytecodes_for_block(int bci) {
2645 #ifndef PRODUCT
2646 if (PrintIRDuringConstruction) {
2647 tty->cr();
2648 InstructionPrinter ip;
2649 ip.print_instr(_block); tty->cr();
2650 ip.print_stack(_block->state()); tty->cr();
2651 ip.print_inline_level(_block);
2652 ip.print_head();
2653 tty->print_cr("locals size: %d stack size: %d", state()->locals_size(), state()->stack_size());
2654 }
2655 #endif
2656 _skip_block = false;
2657 assert(state() != NULL, "ValueStack missing!");
2658 CompileLog* log = compilation()->log();
2659 ciBytecodeStream s(method());
2660 s.reset_to_bci(bci);
2661 int prev_bci = bci;
2662 scope_data()->set_stream(&s);
2663 // iterate
2664 Bytecodes::Code code = Bytecodes::_illegal;
2665 bool push_exception = false;
2667 if (block()->is_set(BlockBegin::exception_entry_flag) && block()->next() == NULL) {
2668 // first thing in the exception entry block should be the exception object.
2669 push_exception = true;
2670 }
2672 while (!bailed_out() && last()->as_BlockEnd() == NULL &&
2673 (code = stream()->next()) != ciBytecodeStream::EOBC() &&
2674 (block_at(s.cur_bci()) == NULL || block_at(s.cur_bci()) == block())) {
2675 assert(state()->kind() == ValueStack::Parsing, "invalid state kind");
2677 if (log != NULL)
2678 log->set_context("bc code='%d' bci='%d'", (int)code, s.cur_bci());
2680 // Check for active jsr during OSR compilation
2681 if (compilation()->is_osr_compile()
2682 && scope()->is_top_scope()
2683 && parsing_jsr()
2684 && s.cur_bci() == compilation()->osr_bci()) {
2685 bailout("OSR not supported while a jsr is active");
2686 }
2688 if (push_exception) {
2689 apush(append(new ExceptionObject()));
2690 push_exception = false;
2691 }
2693 // handle bytecode
2694 switch (code) {
2695 case Bytecodes::_nop : /* nothing to do */ break;
2696 case Bytecodes::_aconst_null : apush(append(new Constant(objectNull ))); break;
2697 case Bytecodes::_iconst_m1 : ipush(append(new Constant(new IntConstant (-1)))); break;
2698 case Bytecodes::_iconst_0 : ipush(append(new Constant(intZero ))); break;
2699 case Bytecodes::_iconst_1 : ipush(append(new Constant(intOne ))); break;
2700 case Bytecodes::_iconst_2 : ipush(append(new Constant(new IntConstant ( 2)))); break;
2701 case Bytecodes::_iconst_3 : ipush(append(new Constant(new IntConstant ( 3)))); break;
2702 case Bytecodes::_iconst_4 : ipush(append(new Constant(new IntConstant ( 4)))); break;
2703 case Bytecodes::_iconst_5 : ipush(append(new Constant(new IntConstant ( 5)))); break;
2704 case Bytecodes::_lconst_0 : lpush(append(new Constant(new LongConstant ( 0)))); break;
2705 case Bytecodes::_lconst_1 : lpush(append(new Constant(new LongConstant ( 1)))); break;
2706 case Bytecodes::_fconst_0 : fpush(append(new Constant(new FloatConstant ( 0)))); break;
2707 case Bytecodes::_fconst_1 : fpush(append(new Constant(new FloatConstant ( 1)))); break;
2708 case Bytecodes::_fconst_2 : fpush(append(new Constant(new FloatConstant ( 2)))); break;
2709 case Bytecodes::_dconst_0 : dpush(append(new Constant(new DoubleConstant( 0)))); break;
2710 case Bytecodes::_dconst_1 : dpush(append(new Constant(new DoubleConstant( 1)))); break;
2711 case Bytecodes::_bipush : ipush(append(new Constant(new IntConstant(((signed char*)s.cur_bcp())[1])))); break;
2712 case Bytecodes::_sipush : ipush(append(new Constant(new IntConstant((short)Bytes::get_Java_u2(s.cur_bcp()+1))))); break;
2713 case Bytecodes::_ldc : // fall through
2714 case Bytecodes::_ldc_w : // fall through
2715 case Bytecodes::_ldc2_w : load_constant(); break;
2716 case Bytecodes::_iload : load_local(intType , s.get_index()); break;
2717 case Bytecodes::_lload : load_local(longType , s.get_index()); break;
2718 case Bytecodes::_fload : load_local(floatType , s.get_index()); break;
2719 case Bytecodes::_dload : load_local(doubleType , s.get_index()); break;
2720 case Bytecodes::_aload : load_local(instanceType, s.get_index()); break;
2721 case Bytecodes::_iload_0 : load_local(intType , 0); break;
2722 case Bytecodes::_iload_1 : load_local(intType , 1); break;
2723 case Bytecodes::_iload_2 : load_local(intType , 2); break;
2724 case Bytecodes::_iload_3 : load_local(intType , 3); break;
2725 case Bytecodes::_lload_0 : load_local(longType , 0); break;
2726 case Bytecodes::_lload_1 : load_local(longType , 1); break;
2727 case Bytecodes::_lload_2 : load_local(longType , 2); break;
2728 case Bytecodes::_lload_3 : load_local(longType , 3); break;
2729 case Bytecodes::_fload_0 : load_local(floatType , 0); break;
2730 case Bytecodes::_fload_1 : load_local(floatType , 1); break;
2731 case Bytecodes::_fload_2 : load_local(floatType , 2); break;
2732 case Bytecodes::_fload_3 : load_local(floatType , 3); break;
2733 case Bytecodes::_dload_0 : load_local(doubleType, 0); break;
2734 case Bytecodes::_dload_1 : load_local(doubleType, 1); break;
2735 case Bytecodes::_dload_2 : load_local(doubleType, 2); break;
2736 case Bytecodes::_dload_3 : load_local(doubleType, 3); break;
2737 case Bytecodes::_aload_0 : load_local(objectType, 0); break;
2738 case Bytecodes::_aload_1 : load_local(objectType, 1); break;
2739 case Bytecodes::_aload_2 : load_local(objectType, 2); break;
2740 case Bytecodes::_aload_3 : load_local(objectType, 3); break;
2741 case Bytecodes::_iaload : load_indexed(T_INT ); break;
2742 case Bytecodes::_laload : load_indexed(T_LONG ); break;
2743 case Bytecodes::_faload : load_indexed(T_FLOAT ); break;
2744 case Bytecodes::_daload : load_indexed(T_DOUBLE); break;
2745 case Bytecodes::_aaload : load_indexed(T_OBJECT); break;
2746 case Bytecodes::_baload : load_indexed(T_BYTE ); break;
2747 case Bytecodes::_caload : load_indexed(T_CHAR ); break;
2748 case Bytecodes::_saload : load_indexed(T_SHORT ); break;
2749 case Bytecodes::_istore : store_local(intType , s.get_index()); break;
2750 case Bytecodes::_lstore : store_local(longType , s.get_index()); break;
2751 case Bytecodes::_fstore : store_local(floatType , s.get_index()); break;
2752 case Bytecodes::_dstore : store_local(doubleType, s.get_index()); break;
2753 case Bytecodes::_astore : store_local(objectType, s.get_index()); break;
2754 case Bytecodes::_istore_0 : store_local(intType , 0); break;
2755 case Bytecodes::_istore_1 : store_local(intType , 1); break;
2756 case Bytecodes::_istore_2 : store_local(intType , 2); break;
2757 case Bytecodes::_istore_3 : store_local(intType , 3); break;
2758 case Bytecodes::_lstore_0 : store_local(longType , 0); break;
2759 case Bytecodes::_lstore_1 : store_local(longType , 1); break;
2760 case Bytecodes::_lstore_2 : store_local(longType , 2); break;
2761 case Bytecodes::_lstore_3 : store_local(longType , 3); break;
2762 case Bytecodes::_fstore_0 : store_local(floatType , 0); break;
2763 case Bytecodes::_fstore_1 : store_local(floatType , 1); break;
2764 case Bytecodes::_fstore_2 : store_local(floatType , 2); break;
2765 case Bytecodes::_fstore_3 : store_local(floatType , 3); break;
2766 case Bytecodes::_dstore_0 : store_local(doubleType, 0); break;
2767 case Bytecodes::_dstore_1 : store_local(doubleType, 1); break;
2768 case Bytecodes::_dstore_2 : store_local(doubleType, 2); break;
2769 case Bytecodes::_dstore_3 : store_local(doubleType, 3); break;
2770 case Bytecodes::_astore_0 : store_local(objectType, 0); break;
2771 case Bytecodes::_astore_1 : store_local(objectType, 1); break;
2772 case Bytecodes::_astore_2 : store_local(objectType, 2); break;
2773 case Bytecodes::_astore_3 : store_local(objectType, 3); break;
2774 case Bytecodes::_iastore : store_indexed(T_INT ); break;
2775 case Bytecodes::_lastore : store_indexed(T_LONG ); break;
2776 case Bytecodes::_fastore : store_indexed(T_FLOAT ); break;
2777 case Bytecodes::_dastore : store_indexed(T_DOUBLE); break;
2778 case Bytecodes::_aastore : store_indexed(T_OBJECT); break;
2779 case Bytecodes::_bastore : store_indexed(T_BYTE ); break;
2780 case Bytecodes::_castore : store_indexed(T_CHAR ); break;
2781 case Bytecodes::_sastore : store_indexed(T_SHORT ); break;
2782 case Bytecodes::_pop : // fall through
2783 case Bytecodes::_pop2 : // fall through
2784 case Bytecodes::_dup : // fall through
2785 case Bytecodes::_dup_x1 : // fall through
2786 case Bytecodes::_dup_x2 : // fall through
2787 case Bytecodes::_dup2 : // fall through
2788 case Bytecodes::_dup2_x1 : // fall through
2789 case Bytecodes::_dup2_x2 : // fall through
2790 case Bytecodes::_swap : stack_op(code); break;
2791 case Bytecodes::_iadd : arithmetic_op(intType , code); break;
2792 case Bytecodes::_ladd : arithmetic_op(longType , code); break;
2793 case Bytecodes::_fadd : arithmetic_op(floatType , code); break;
2794 case Bytecodes::_dadd : arithmetic_op(doubleType, code); break;
2795 case Bytecodes::_isub : arithmetic_op(intType , code); break;
2796 case Bytecodes::_lsub : arithmetic_op(longType , code); break;
2797 case Bytecodes::_fsub : arithmetic_op(floatType , code); break;
2798 case Bytecodes::_dsub : arithmetic_op(doubleType, code); break;
2799 case Bytecodes::_imul : arithmetic_op(intType , code); break;
2800 case Bytecodes::_lmul : arithmetic_op(longType , code); break;
2801 case Bytecodes::_fmul : arithmetic_op(floatType , code); break;
2802 case Bytecodes::_dmul : arithmetic_op(doubleType, code); break;
2803 case Bytecodes::_idiv : arithmetic_op(intType , code, copy_state_for_exception()); break;
2804 case Bytecodes::_ldiv : arithmetic_op(longType , code, copy_state_for_exception()); break;
2805 case Bytecodes::_fdiv : arithmetic_op(floatType , code); break;
2806 case Bytecodes::_ddiv : arithmetic_op(doubleType, code); break;
2807 case Bytecodes::_irem : arithmetic_op(intType , code, copy_state_for_exception()); break;
2808 case Bytecodes::_lrem : arithmetic_op(longType , code, copy_state_for_exception()); break;
2809 case Bytecodes::_frem : arithmetic_op(floatType , code); break;
2810 case Bytecodes::_drem : arithmetic_op(doubleType, code); break;
2811 case Bytecodes::_ineg : negate_op(intType ); break;
2812 case Bytecodes::_lneg : negate_op(longType ); break;
2813 case Bytecodes::_fneg : negate_op(floatType ); break;
2814 case Bytecodes::_dneg : negate_op(doubleType); break;
2815 case Bytecodes::_ishl : shift_op(intType , code); break;
2816 case Bytecodes::_lshl : shift_op(longType, code); break;
2817 case Bytecodes::_ishr : shift_op(intType , code); break;
2818 case Bytecodes::_lshr : shift_op(longType, code); break;
2819 case Bytecodes::_iushr : shift_op(intType , code); break;
2820 case Bytecodes::_lushr : shift_op(longType, code); break;
2821 case Bytecodes::_iand : logic_op(intType , code); break;
2822 case Bytecodes::_land : logic_op(longType, code); break;
2823 case Bytecodes::_ior : logic_op(intType , code); break;
2824 case Bytecodes::_lor : logic_op(longType, code); break;
2825 case Bytecodes::_ixor : logic_op(intType , code); break;
2826 case Bytecodes::_lxor : logic_op(longType, code); break;
2827 case Bytecodes::_iinc : increment(); break;
2828 case Bytecodes::_i2l : convert(code, T_INT , T_LONG ); break;
2829 case Bytecodes::_i2f : convert(code, T_INT , T_FLOAT ); break;
2830 case Bytecodes::_i2d : convert(code, T_INT , T_DOUBLE); break;
2831 case Bytecodes::_l2i : convert(code, T_LONG , T_INT ); break;
2832 case Bytecodes::_l2f : convert(code, T_LONG , T_FLOAT ); break;
2833 case Bytecodes::_l2d : convert(code, T_LONG , T_DOUBLE); break;
2834 case Bytecodes::_f2i : convert(code, T_FLOAT , T_INT ); break;
2835 case Bytecodes::_f2l : convert(code, T_FLOAT , T_LONG ); break;
2836 case Bytecodes::_f2d : convert(code, T_FLOAT , T_DOUBLE); break;
2837 case Bytecodes::_d2i : convert(code, T_DOUBLE, T_INT ); break;
2838 case Bytecodes::_d2l : convert(code, T_DOUBLE, T_LONG ); break;
2839 case Bytecodes::_d2f : convert(code, T_DOUBLE, T_FLOAT ); break;
2840 case Bytecodes::_i2b : convert(code, T_INT , T_BYTE ); break;
2841 case Bytecodes::_i2c : convert(code, T_INT , T_CHAR ); break;
2842 case Bytecodes::_i2s : convert(code, T_INT , T_SHORT ); break;
2843 case Bytecodes::_lcmp : compare_op(longType , code); break;
2844 case Bytecodes::_fcmpl : compare_op(floatType , code); break;
2845 case Bytecodes::_fcmpg : compare_op(floatType , code); break;
2846 case Bytecodes::_dcmpl : compare_op(doubleType, code); break;
2847 case Bytecodes::_dcmpg : compare_op(doubleType, code); break;
2848 case Bytecodes::_ifeq : if_zero(intType , If::eql); break;
2849 case Bytecodes::_ifne : if_zero(intType , If::neq); break;
2850 case Bytecodes::_iflt : if_zero(intType , If::lss); break;
2851 case Bytecodes::_ifge : if_zero(intType , If::geq); break;
2852 case Bytecodes::_ifgt : if_zero(intType , If::gtr); break;
2853 case Bytecodes::_ifle : if_zero(intType , If::leq); break;
2854 case Bytecodes::_if_icmpeq : if_same(intType , If::eql); break;
2855 case Bytecodes::_if_icmpne : if_same(intType , If::neq); break;
2856 case Bytecodes::_if_icmplt : if_same(intType , If::lss); break;
2857 case Bytecodes::_if_icmpge : if_same(intType , If::geq); break;
2858 case Bytecodes::_if_icmpgt : if_same(intType , If::gtr); break;
2859 case Bytecodes::_if_icmple : if_same(intType , If::leq); break;
2860 case Bytecodes::_if_acmpeq : if_same(objectType, If::eql); break;
2861 case Bytecodes::_if_acmpne : if_same(objectType, If::neq); break;
2862 case Bytecodes::_goto : _goto(s.cur_bci(), s.get_dest()); break;
2863 case Bytecodes::_jsr : jsr(s.get_dest()); break;
2864 case Bytecodes::_ret : ret(s.get_index()); break;
2865 case Bytecodes::_tableswitch : table_switch(); break;
2866 case Bytecodes::_lookupswitch : lookup_switch(); break;
2867 case Bytecodes::_ireturn : method_return(ipop()); break;
2868 case Bytecodes::_lreturn : method_return(lpop()); break;
2869 case Bytecodes::_freturn : method_return(fpop()); break;
2870 case Bytecodes::_dreturn : method_return(dpop()); break;
2871 case Bytecodes::_areturn : method_return(apop()); break;
2872 case Bytecodes::_return : method_return(NULL ); break;
2873 case Bytecodes::_getstatic : // fall through
2874 case Bytecodes::_putstatic : // fall through
2875 case Bytecodes::_getfield : // fall through
2876 case Bytecodes::_putfield : access_field(code); break;
2877 case Bytecodes::_invokevirtual : // fall through
2878 case Bytecodes::_invokespecial : // fall through
2879 case Bytecodes::_invokestatic : // fall through
2880 case Bytecodes::_invokedynamic : // fall through
2881 case Bytecodes::_invokeinterface: invoke(code); break;
2882 case Bytecodes::_new : new_instance(s.get_index_u2()); break;
2883 case Bytecodes::_newarray : new_type_array(); break;
2884 case Bytecodes::_anewarray : new_object_array(); break;
2885 case Bytecodes::_arraylength : { ValueStack* state_before = copy_state_for_exception(); ipush(append(new ArrayLength(apop(), state_before))); break; }
2886 case Bytecodes::_athrow : throw_op(s.cur_bci()); break;
2887 case Bytecodes::_checkcast : check_cast(s.get_index_u2()); break;
2888 case Bytecodes::_instanceof : instance_of(s.get_index_u2()); break;
2889 case Bytecodes::_monitorenter : monitorenter(apop(), s.cur_bci()); break;
2890 case Bytecodes::_monitorexit : monitorexit (apop(), s.cur_bci()); break;
2891 case Bytecodes::_wide : ShouldNotReachHere(); break;
2892 case Bytecodes::_multianewarray : new_multi_array(s.cur_bcp()[3]); break;
2893 case Bytecodes::_ifnull : if_null(objectType, If::eql); break;
2894 case Bytecodes::_ifnonnull : if_null(objectType, If::neq); break;
2895 case Bytecodes::_goto_w : _goto(s.cur_bci(), s.get_far_dest()); break;
2896 case Bytecodes::_jsr_w : jsr(s.get_far_dest()); break;
2897 case Bytecodes::_breakpoint : BAILOUT_("concurrent setting of breakpoint", NULL);
2898 default : ShouldNotReachHere(); break;
2899 }
2901 if (log != NULL)
2902 log->clear_context(); // skip marker if nothing was printed
2904 // save current bci to setup Goto at the end
2905 prev_bci = s.cur_bci();
2907 }
2908 CHECK_BAILOUT_(NULL);
2909 // stop processing of this block (see try_inline_full)
2910 if (_skip_block) {
2911 _skip_block = false;
2912 assert(_last && _last->as_BlockEnd(), "");
2913 return _last->as_BlockEnd();
2914 }
2915 // if there are any, check if last instruction is a BlockEnd instruction
2916 BlockEnd* end = last()->as_BlockEnd();
2917 if (end == NULL) {
2918 // all blocks must end with a BlockEnd instruction => add a Goto
2919 end = new Goto(block_at(s.cur_bci()), false);
2920 append(end);
2921 }
2922 assert(end == last()->as_BlockEnd(), "inconsistency");
2924 assert(end->state() != NULL, "state must already be present");
2925 assert(end->as_Return() == NULL || end->as_Throw() == NULL || end->state()->stack_size() == 0, "stack not needed for return and throw");
2927 // connect to begin & set state
2928 // NOTE that inlining may have changed the block we are parsing
2929 block()->set_end(end);
2930 // propagate state
2931 for (int i = end->number_of_sux() - 1; i >= 0; i--) {
2932 BlockBegin* sux = end->sux_at(i);
2933 assert(sux->is_predecessor(block()), "predecessor missing");
2934 // be careful, bailout if bytecodes are strange
2935 if (!sux->try_merge(end->state())) BAILOUT_("block join failed", NULL);
2936 scope_data()->add_to_work_list(end->sux_at(i));
2937 }
2939 scope_data()->set_stream(NULL);
2941 // done
2942 return end;
2943 }
2946 void GraphBuilder::iterate_all_blocks(bool start_in_current_block_for_inlining) {
2947 do {
2948 if (start_in_current_block_for_inlining && !bailed_out()) {
2949 iterate_bytecodes_for_block(0);
2950 start_in_current_block_for_inlining = false;
2951 } else {
2952 BlockBegin* b;
2953 while ((b = scope_data()->remove_from_work_list()) != NULL) {
2954 if (!b->is_set(BlockBegin::was_visited_flag)) {
2955 if (b->is_set(BlockBegin::osr_entry_flag)) {
2956 // we're about to parse the osr entry block, so make sure
2957 // we setup the OSR edge leading into this block so that
2958 // Phis get setup correctly.
2959 setup_osr_entry_block();
2960 // this is no longer the osr entry block, so clear it.
2961 b->clear(BlockBegin::osr_entry_flag);
2962 }
2963 b->set(BlockBegin::was_visited_flag);
2964 connect_to_end(b);
2965 }
2966 }
2967 }
2968 } while (!bailed_out() && !scope_data()->is_work_list_empty());
2969 }
2972 bool GraphBuilder::_can_trap [Bytecodes::number_of_java_codes];
2974 void GraphBuilder::initialize() {
2975 // the following bytecodes are assumed to potentially
2976 // throw exceptions in compiled code - note that e.g.
2977 // monitorexit & the return bytecodes do not throw
2978 // exceptions since monitor pairing proved that they
2979 // succeed (if monitor pairing succeeded)
2980 Bytecodes::Code can_trap_list[] =
2981 { Bytecodes::_ldc
2982 , Bytecodes::_ldc_w
2983 , Bytecodes::_ldc2_w
2984 , Bytecodes::_iaload
2985 , Bytecodes::_laload
2986 , Bytecodes::_faload
2987 , Bytecodes::_daload
2988 , Bytecodes::_aaload
2989 , Bytecodes::_baload
2990 , Bytecodes::_caload
2991 , Bytecodes::_saload
2992 , Bytecodes::_iastore
2993 , Bytecodes::_lastore
2994 , Bytecodes::_fastore
2995 , Bytecodes::_dastore
2996 , Bytecodes::_aastore
2997 , Bytecodes::_bastore
2998 , Bytecodes::_castore
2999 , Bytecodes::_sastore
3000 , Bytecodes::_idiv
3001 , Bytecodes::_ldiv
3002 , Bytecodes::_irem
3003 , Bytecodes::_lrem
3004 , Bytecodes::_getstatic
3005 , Bytecodes::_putstatic
3006 , Bytecodes::_getfield
3007 , Bytecodes::_putfield
3008 , Bytecodes::_invokevirtual
3009 , Bytecodes::_invokespecial
3010 , Bytecodes::_invokestatic
3011 , Bytecodes::_invokedynamic
3012 , Bytecodes::_invokeinterface
3013 , Bytecodes::_new
3014 , Bytecodes::_newarray
3015 , Bytecodes::_anewarray
3016 , Bytecodes::_arraylength
3017 , Bytecodes::_athrow
3018 , Bytecodes::_checkcast
3019 , Bytecodes::_instanceof
3020 , Bytecodes::_monitorenter
3021 , Bytecodes::_multianewarray
3022 };
3024 // inititialize trap tables
3025 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) {
3026 _can_trap[i] = false;
3027 }
3028 // set standard trap info
3029 for (uint j = 0; j < ARRAY_SIZE(can_trap_list); j++) {
3030 _can_trap[can_trap_list[j]] = true;
3031 }
3032 }
3035 BlockBegin* GraphBuilder::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) {
3036 assert(entry->is_set(f), "entry/flag mismatch");
3037 // create header block
3038 BlockBegin* h = new BlockBegin(entry->bci());
3039 h->set_depth_first_number(0);
3041 Value l = h;
3042 BlockEnd* g = new Goto(entry, false);
3043 l->set_next(g, entry->bci());
3044 h->set_end(g);
3045 h->set(f);
3046 // setup header block end state
3047 ValueStack* s = state->copy(ValueStack::StateAfter, entry->bci()); // can use copy since stack is empty (=> no phis)
3048 assert(s->stack_is_empty(), "must have empty stack at entry point");
3049 g->set_state(s);
3050 return h;
3051 }
3055 BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* state) {
3056 BlockBegin* start = new BlockBegin(0);
3058 // This code eliminates the empty start block at the beginning of
3059 // each method. Previously, each method started with the
3060 // start-block created below, and this block was followed by the
3061 // header block that was always empty. This header block is only
3062 // necesary if std_entry is also a backward branch target because
3063 // then phi functions may be necessary in the header block. It's
3064 // also necessary when profiling so that there's a single block that
3065 // can increment the interpreter_invocation_count.
3066 BlockBegin* new_header_block;
3067 if (std_entry->number_of_preds() > 0 || count_invocations() || count_backedges()) {
3068 new_header_block = header_block(std_entry, BlockBegin::std_entry_flag, state);
3069 } else {
3070 new_header_block = std_entry;
3071 }
3073 // setup start block (root for the IR graph)
3074 Base* base =
3075 new Base(
3076 new_header_block,
3077 osr_entry
3078 );
3079 start->set_next(base, 0);
3080 start->set_end(base);
3081 // create & setup state for start block
3082 start->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
3083 base->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
3085 if (base->std_entry()->state() == NULL) {
3086 // setup states for header blocks
3087 base->std_entry()->merge(state);
3088 }
3090 assert(base->std_entry()->state() != NULL, "");
3091 return start;
3092 }
3095 void GraphBuilder::setup_osr_entry_block() {
3096 assert(compilation()->is_osr_compile(), "only for osrs");
3098 int osr_bci = compilation()->osr_bci();
3099 ciBytecodeStream s(method());
3100 s.reset_to_bci(osr_bci);
3101 s.next();
3102 scope_data()->set_stream(&s);
3104 // create a new block to be the osr setup code
3105 _osr_entry = new BlockBegin(osr_bci);
3106 _osr_entry->set(BlockBegin::osr_entry_flag);
3107 _osr_entry->set_depth_first_number(0);
3108 BlockBegin* target = bci2block()->at(osr_bci);
3109 assert(target != NULL && target->is_set(BlockBegin::osr_entry_flag), "must be there");
3110 // the osr entry has no values for locals
3111 ValueStack* state = target->state()->copy();
3112 _osr_entry->set_state(state);
3114 kill_all();
3115 _block = _osr_entry;
3116 _state = _osr_entry->state()->copy();
3117 assert(_state->bci() == osr_bci, "mismatch");
3118 _last = _osr_entry;
3119 Value e = append(new OsrEntry());
3120 e->set_needs_null_check(false);
3122 // OSR buffer is
3123 //
3124 // locals[nlocals-1..0]
3125 // monitors[number_of_locks-1..0]
3126 //
3127 // locals is a direct copy of the interpreter frame so in the osr buffer
3128 // so first slot in the local array is the last local from the interpreter
3129 // and last slot is local[0] (receiver) from the interpreter
3130 //
3131 // Similarly with locks. The first lock slot in the osr buffer is the nth lock
3132 // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock
3133 // in the interpreter frame (the method lock if a sync method)
3135 // Initialize monitors in the compiled activation.
3137 int index;
3138 Value local;
3140 // find all the locals that the interpreter thinks contain live oops
3141 const BitMap live_oops = method()->live_local_oops_at_bci(osr_bci);
3143 // compute the offset into the locals so that we can treat the buffer
3144 // as if the locals were still in the interpreter frame
3145 int locals_offset = BytesPerWord * (method()->max_locals() - 1);
3146 for_each_local_value(state, index, local) {
3147 int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord;
3148 Value get;
3149 if (local->type()->is_object_kind() && !live_oops.at(index)) {
3150 // The interpreter thinks this local is dead but the compiler
3151 // doesn't so pretend that the interpreter passed in null.
3152 get = append(new Constant(objectNull));
3153 } else {
3154 get = append(new UnsafeGetRaw(as_BasicType(local->type()), e,
3155 append(new Constant(new IntConstant(offset))),
3156 0,
3157 true /*unaligned*/, true /*wide*/));
3158 }
3159 _state->store_local(index, get);
3160 }
3162 // the storage for the OSR buffer is freed manually in the LIRGenerator.
3164 assert(state->caller_state() == NULL, "should be top scope");
3165 state->clear_locals();
3166 Goto* g = new Goto(target, false);
3167 append(g);
3168 _osr_entry->set_end(g);
3169 target->merge(_osr_entry->end()->state());
3171 scope_data()->set_stream(NULL);
3172 }
3175 ValueStack* GraphBuilder::state_at_entry() {
3176 ValueStack* state = new ValueStack(scope(), NULL);
3178 // Set up locals for receiver
3179 int idx = 0;
3180 if (!method()->is_static()) {
3181 // we should always see the receiver
3182 state->store_local(idx, new Local(method()->holder(), objectType, idx));
3183 idx = 1;
3184 }
3186 // Set up locals for incoming arguments
3187 ciSignature* sig = method()->signature();
3188 for (int i = 0; i < sig->count(); i++) {
3189 ciType* type = sig->type_at(i);
3190 BasicType basic_type = type->basic_type();
3191 // don't allow T_ARRAY to propagate into locals types
3192 if (basic_type == T_ARRAY) basic_type = T_OBJECT;
3193 ValueType* vt = as_ValueType(basic_type);
3194 state->store_local(idx, new Local(type, vt, idx));
3195 idx += type->size();
3196 }
3198 // lock synchronized method
3199 if (method()->is_synchronized()) {
3200 state->lock(NULL);
3201 }
3203 return state;
3204 }
3207 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope)
3208 : _scope_data(NULL)
3209 , _instruction_count(0)
3210 , _osr_entry(NULL)
3211 , _memory(new MemoryBuffer())
3212 , _compilation(compilation)
3213 , _inline_bailout_msg(NULL)
3214 {
3215 int osr_bci = compilation->osr_bci();
3217 // determine entry points and bci2block mapping
3218 BlockListBuilder blm(compilation, scope, osr_bci);
3219 CHECK_BAILOUT();
3221 BlockList* bci2block = blm.bci2block();
3222 BlockBegin* start_block = bci2block->at(0);
3224 push_root_scope(scope, bci2block, start_block);
3226 // setup state for std entry
3227 _initial_state = state_at_entry();
3228 start_block->merge(_initial_state);
3230 // complete graph
3231 _vmap = new ValueMap();
3232 switch (scope->method()->intrinsic_id()) {
3233 case vmIntrinsics::_dabs : // fall through
3234 case vmIntrinsics::_dsqrt : // fall through
3235 case vmIntrinsics::_dsin : // fall through
3236 case vmIntrinsics::_dcos : // fall through
3237 case vmIntrinsics::_dtan : // fall through
3238 case vmIntrinsics::_dlog : // fall through
3239 case vmIntrinsics::_dlog10 : // fall through
3240 case vmIntrinsics::_dexp : // fall through
3241 case vmIntrinsics::_dpow : // fall through
3242 {
3243 // Compiles where the root method is an intrinsic need a special
3244 // compilation environment because the bytecodes for the method
3245 // shouldn't be parsed during the compilation, only the special
3246 // Intrinsic node should be emitted. If this isn't done the the
3247 // code for the inlined version will be different than the root
3248 // compiled version which could lead to monotonicity problems on
3249 // intel.
3251 // Set up a stream so that appending instructions works properly.
3252 ciBytecodeStream s(scope->method());
3253 s.reset_to_bci(0);
3254 scope_data()->set_stream(&s);
3255 s.next();
3257 // setup the initial block state
3258 _block = start_block;
3259 _state = start_block->state()->copy_for_parsing();
3260 _last = start_block;
3261 load_local(doubleType, 0);
3262 if (scope->method()->intrinsic_id() == vmIntrinsics::_dpow) {
3263 load_local(doubleType, 2);
3264 }
3266 // Emit the intrinsic node.
3267 bool result = try_inline_intrinsics(scope->method());
3268 if (!result) BAILOUT("failed to inline intrinsic");
3269 method_return(dpop());
3271 // connect the begin and end blocks and we're all done.
3272 BlockEnd* end = last()->as_BlockEnd();
3273 block()->set_end(end);
3274 break;
3275 }
3277 case vmIntrinsics::_Reference_get:
3278 {
3279 {
3280 // With java.lang.ref.reference.get() we must go through the
3281 // intrinsic - when G1 is enabled - even when get() is the root
3282 // method of the compile so that, if necessary, the value in
3283 // the referent field of the reference object gets recorded by
3284 // the pre-barrier code.
3285 // Specifically, if G1 is enabled, the value in the referent
3286 // field is recorded by the G1 SATB pre barrier. This will
3287 // result in the referent being marked live and the reference
3288 // object removed from the list of discovered references during
3289 // reference processing.
3291 // Also we need intrinsic to prevent commoning reads from this field
3292 // across safepoint since GC can change its value.
3294 // Set up a stream so that appending instructions works properly.
3295 ciBytecodeStream s(scope->method());
3296 s.reset_to_bci(0);
3297 scope_data()->set_stream(&s);
3298 s.next();
3300 // setup the initial block state
3301 _block = start_block;
3302 _state = start_block->state()->copy_for_parsing();
3303 _last = start_block;
3304 load_local(objectType, 0);
3306 // Emit the intrinsic node.
3307 bool result = try_inline_intrinsics(scope->method());
3308 if (!result) BAILOUT("failed to inline intrinsic");
3309 method_return(apop());
3311 // connect the begin and end blocks and we're all done.
3312 BlockEnd* end = last()->as_BlockEnd();
3313 block()->set_end(end);
3314 break;
3315 }
3316 // Otherwise, fall thru
3317 }
3319 default:
3320 scope_data()->add_to_work_list(start_block);
3321 iterate_all_blocks();
3322 break;
3323 }
3324 CHECK_BAILOUT();
3326 _start = setup_start_block(osr_bci, start_block, _osr_entry, _initial_state);
3328 eliminate_redundant_phis(_start);
3330 NOT_PRODUCT(if (PrintValueNumbering && Verbose) print_stats());
3331 // for osr compile, bailout if some requirements are not fulfilled
3332 if (osr_bci != -1) {
3333 BlockBegin* osr_block = blm.bci2block()->at(osr_bci);
3334 if (!osr_block->is_set(BlockBegin::was_visited_flag)) {
3335 BAILOUT("osr entry must have been visited for osr compile");
3336 }
3338 // check if osr entry point has empty stack - we cannot handle non-empty stacks at osr entry points
3339 if (!osr_block->state()->stack_is_empty()) {
3340 BAILOUT("stack not empty at OSR entry point");
3341 }
3342 }
3343 #ifndef PRODUCT
3344 if (PrintCompilation && Verbose) tty->print_cr("Created %d Instructions", _instruction_count);
3345 #endif
3346 }
3349 ValueStack* GraphBuilder::copy_state_before() {
3350 return copy_state_before_with_bci(bci());
3351 }
3353 ValueStack* GraphBuilder::copy_state_exhandling() {
3354 return copy_state_exhandling_with_bci(bci());
3355 }
3357 ValueStack* GraphBuilder::copy_state_for_exception() {
3358 return copy_state_for_exception_with_bci(bci());
3359 }
3361 ValueStack* GraphBuilder::copy_state_before_with_bci(int bci) {
3362 return state()->copy(ValueStack::StateBefore, bci);
3363 }
3365 ValueStack* GraphBuilder::copy_state_exhandling_with_bci(int bci) {
3366 if (!has_handler()) return NULL;
3367 return state()->copy(ValueStack::StateBefore, bci);
3368 }
3370 ValueStack* GraphBuilder::copy_state_for_exception_with_bci(int bci) {
3371 ValueStack* s = copy_state_exhandling_with_bci(bci);
3372 if (s == NULL) {
3373 if (_compilation->env()->should_retain_local_variables()) {
3374 s = state()->copy(ValueStack::ExceptionState, bci);
3375 } else {
3376 s = state()->copy(ValueStack::EmptyExceptionState, bci);
3377 }
3378 }
3379 return s;
3380 }
3382 int GraphBuilder::recursive_inline_level(ciMethod* cur_callee) const {
3383 int recur_level = 0;
3384 for (IRScope* s = scope(); s != NULL; s = s->caller()) {
3385 if (s->method() == cur_callee) {
3386 ++recur_level;
3387 }
3388 }
3389 return recur_level;
3390 }
3393 bool GraphBuilder::try_inline(ciMethod* callee, bool holder_known, Bytecodes::Code bc, Value receiver) {
3394 const char* msg = NULL;
3396 // clear out any existing inline bailout condition
3397 clear_inline_bailout();
3399 // exclude methods we don't want to inline
3400 msg = should_not_inline(callee);
3401 if (msg != NULL) {
3402 print_inlining(callee, msg, /*success*/ false);
3403 return false;
3404 }
3406 // method handle invokes
3407 if (callee->is_method_handle_intrinsic()) {
3408 return try_method_handle_inline(callee);
3409 }
3411 // handle intrinsics
3412 if (callee->intrinsic_id() != vmIntrinsics::_none) {
3413 if (try_inline_intrinsics(callee)) {
3414 print_inlining(callee, "intrinsic");
3415 return true;
3416 }
3417 // try normal inlining
3418 }
3420 // certain methods cannot be parsed at all
3421 msg = check_can_parse(callee);
3422 if (msg != NULL) {
3423 print_inlining(callee, msg, /*success*/ false);
3424 return false;
3425 }
3427 // If bytecode not set use the current one.
3428 if (bc == Bytecodes::_illegal) {
3429 bc = code();
3430 }
3431 if (try_inline_full(callee, holder_known, bc, receiver))
3432 return true;
3434 // Entire compilation could fail during try_inline_full call.
3435 // In that case printing inlining decision info is useless.
3436 if (!bailed_out())
3437 print_inlining(callee, _inline_bailout_msg, /*success*/ false);
3439 return false;
3440 }
3443 const char* GraphBuilder::check_can_parse(ciMethod* callee) const {
3444 // Certain methods cannot be parsed at all:
3445 if ( callee->is_native()) return "native method";
3446 if ( callee->is_abstract()) return "abstract method";
3447 if (!callee->can_be_compiled()) return "not compilable (disabled)";
3448 return NULL;
3449 }
3452 // negative filter: should callee NOT be inlined? returns NULL, ok to inline, or rejection msg
3453 const char* GraphBuilder::should_not_inline(ciMethod* callee) const {
3454 if ( callee->should_exclude()) return "excluded by CompilerOracle";
3455 if ( callee->should_not_inline()) return "disallowed by CompilerOracle";
3456 if ( callee->dont_inline()) return "don't inline by annotation";
3457 return NULL;
3458 }
3461 bool GraphBuilder::try_inline_intrinsics(ciMethod* callee) {
3462 if (callee->is_synchronized()) {
3463 // We don't currently support any synchronized intrinsics
3464 return false;
3465 }
3467 // callee seems like a good candidate
3468 // determine id
3469 vmIntrinsics::ID id = callee->intrinsic_id();
3470 if (!InlineNatives && id != vmIntrinsics::_Reference_get) {
3471 // InlineNatives does not control Reference.get
3472 INLINE_BAILOUT("intrinsic method inlining disabled");
3473 }
3474 bool preserves_state = false;
3475 bool cantrap = true;
3476 switch (id) {
3477 case vmIntrinsics::_arraycopy:
3478 #ifndef MIPS
3479 if (!InlineArrayCopy) return false;
3480 #else
3481 // Return false for mips since LIR_Assembler::emit_arraycopy isn't implemented yet.
3482 return false;
3483 #endif
3484 break;
3486 #ifdef JFR_HAVE_INTRINSICS
3487 #if defined(_LP64) || !defined(TRACE_ID_CLASS_SHIFT)
3488 case vmIntrinsics::_getClassId:
3489 preserves_state = false;
3490 cantrap = false;
3491 break;
3492 #endif
3494 case vmIntrinsics::_getEventWriter:
3495 preserves_state = false;
3496 cantrap = true;
3497 break;
3499 case vmIntrinsics::_counterTime:
3500 preserves_state = true;
3501 cantrap = false;
3502 break;
3503 #endif
3505 case vmIntrinsics::_currentTimeMillis:
3506 case vmIntrinsics::_nanoTime:
3507 preserves_state = true;
3508 cantrap = false;
3509 break;
3511 case vmIntrinsics::_floatToRawIntBits :
3512 case vmIntrinsics::_intBitsToFloat :
3513 case vmIntrinsics::_doubleToRawLongBits :
3514 case vmIntrinsics::_longBitsToDouble :
3515 if (!InlineMathNatives) return false;
3516 preserves_state = true;
3517 cantrap = false;
3518 break;
3520 case vmIntrinsics::_getClass :
3521 case vmIntrinsics::_isInstance :
3522 if (!InlineClassNatives) return false;
3523 preserves_state = true;
3524 break;
3526 case vmIntrinsics::_currentThread :
3527 if (!InlineThreadNatives) return false;
3528 preserves_state = true;
3529 cantrap = false;
3530 break;
3532 case vmIntrinsics::_dabs : // fall through
3533 case vmIntrinsics::_dsqrt : // fall through
3534 case vmIntrinsics::_dsin : // fall through
3535 case vmIntrinsics::_dcos : // fall through
3536 case vmIntrinsics::_dtan : // fall through
3537 case vmIntrinsics::_dlog : // fall through
3538 case vmIntrinsics::_dlog10 : // fall through
3539 case vmIntrinsics::_dexp : // fall through
3540 case vmIntrinsics::_dpow : // fall through
3541 if (!InlineMathNatives) return false;
3542 cantrap = false;
3543 preserves_state = true;
3544 break;
3546 // Use special nodes for Unsafe instructions so we can more easily
3547 // perform an address-mode optimization on the raw variants
3548 case vmIntrinsics::_getObject : return append_unsafe_get_obj(callee, T_OBJECT, false);
3549 case vmIntrinsics::_getBoolean: return append_unsafe_get_obj(callee, T_BOOLEAN, false);
3550 case vmIntrinsics::_getByte : return append_unsafe_get_obj(callee, T_BYTE, false);
3551 case vmIntrinsics::_getShort : return append_unsafe_get_obj(callee, T_SHORT, false);
3552 case vmIntrinsics::_getChar : return append_unsafe_get_obj(callee, T_CHAR, false);
3553 case vmIntrinsics::_getInt : return append_unsafe_get_obj(callee, T_INT, false);
3554 case vmIntrinsics::_getLong : return append_unsafe_get_obj(callee, T_LONG, false);
3555 case vmIntrinsics::_getFloat : return append_unsafe_get_obj(callee, T_FLOAT, false);
3556 case vmIntrinsics::_getDouble : return append_unsafe_get_obj(callee, T_DOUBLE, false);
3558 case vmIntrinsics::_putObject : return append_unsafe_put_obj(callee, T_OBJECT, false);
3559 case vmIntrinsics::_putBoolean: return append_unsafe_put_obj(callee, T_BOOLEAN, false);
3560 case vmIntrinsics::_putByte : return append_unsafe_put_obj(callee, T_BYTE, false);
3561 case vmIntrinsics::_putShort : return append_unsafe_put_obj(callee, T_SHORT, false);
3562 case vmIntrinsics::_putChar : return append_unsafe_put_obj(callee, T_CHAR, false);
3563 case vmIntrinsics::_putInt : return append_unsafe_put_obj(callee, T_INT, false);
3564 case vmIntrinsics::_putLong : return append_unsafe_put_obj(callee, T_LONG, false);
3565 case vmIntrinsics::_putFloat : return append_unsafe_put_obj(callee, T_FLOAT, false);
3566 case vmIntrinsics::_putDouble : return append_unsafe_put_obj(callee, T_DOUBLE, false);
3568 case vmIntrinsics::_getObjectVolatile : return append_unsafe_get_obj(callee, T_OBJECT, true);
3569 case vmIntrinsics::_getBooleanVolatile: return append_unsafe_get_obj(callee, T_BOOLEAN, true);
3570 case vmIntrinsics::_getByteVolatile : return append_unsafe_get_obj(callee, T_BYTE, true);
3571 case vmIntrinsics::_getShortVolatile : return append_unsafe_get_obj(callee, T_SHORT, true);
3572 case vmIntrinsics::_getCharVolatile : return append_unsafe_get_obj(callee, T_CHAR, true);
3573 case vmIntrinsics::_getIntVolatile : return append_unsafe_get_obj(callee, T_INT, true);
3574 case vmIntrinsics::_getLongVolatile : return append_unsafe_get_obj(callee, T_LONG, true);
3575 case vmIntrinsics::_getFloatVolatile : return append_unsafe_get_obj(callee, T_FLOAT, true);
3576 case vmIntrinsics::_getDoubleVolatile : return append_unsafe_get_obj(callee, T_DOUBLE, true);
3578 case vmIntrinsics::_putObjectVolatile : return append_unsafe_put_obj(callee, T_OBJECT, true);
3579 case vmIntrinsics::_putBooleanVolatile: return append_unsafe_put_obj(callee, T_BOOLEAN, true);
3580 case vmIntrinsics::_putByteVolatile : return append_unsafe_put_obj(callee, T_BYTE, true);
3581 case vmIntrinsics::_putShortVolatile : return append_unsafe_put_obj(callee, T_SHORT, true);
3582 case vmIntrinsics::_putCharVolatile : return append_unsafe_put_obj(callee, T_CHAR, true);
3583 case vmIntrinsics::_putIntVolatile : return append_unsafe_put_obj(callee, T_INT, true);
3584 case vmIntrinsics::_putLongVolatile : return append_unsafe_put_obj(callee, T_LONG, true);
3585 case vmIntrinsics::_putFloatVolatile : return append_unsafe_put_obj(callee, T_FLOAT, true);
3586 case vmIntrinsics::_putDoubleVolatile : return append_unsafe_put_obj(callee, T_DOUBLE, true);
3588 case vmIntrinsics::_getByte_raw : return append_unsafe_get_raw(callee, T_BYTE);
3589 case vmIntrinsics::_getShort_raw : return append_unsafe_get_raw(callee, T_SHORT);
3590 case vmIntrinsics::_getChar_raw : return append_unsafe_get_raw(callee, T_CHAR);
3591 case vmIntrinsics::_getInt_raw : return append_unsafe_get_raw(callee, T_INT);
3592 case vmIntrinsics::_getLong_raw : return append_unsafe_get_raw(callee, T_LONG);
3593 case vmIntrinsics::_getFloat_raw : return append_unsafe_get_raw(callee, T_FLOAT);
3594 case vmIntrinsics::_getDouble_raw : return append_unsafe_get_raw(callee, T_DOUBLE);
3596 case vmIntrinsics::_putByte_raw : return append_unsafe_put_raw(callee, T_BYTE);
3597 case vmIntrinsics::_putShort_raw : return append_unsafe_put_raw(callee, T_SHORT);
3598 case vmIntrinsics::_putChar_raw : return append_unsafe_put_raw(callee, T_CHAR);
3599 case vmIntrinsics::_putInt_raw : return append_unsafe_put_raw(callee, T_INT);
3600 case vmIntrinsics::_putLong_raw : return append_unsafe_put_raw(callee, T_LONG);
3601 case vmIntrinsics::_putFloat_raw : return append_unsafe_put_raw(callee, T_FLOAT);
3602 case vmIntrinsics::_putDouble_raw : return append_unsafe_put_raw(callee, T_DOUBLE);
3604 case vmIntrinsics::_prefetchRead : return append_unsafe_prefetch(callee, false, false);
3605 case vmIntrinsics::_prefetchWrite : return append_unsafe_prefetch(callee, false, true);
3606 case vmIntrinsics::_prefetchReadStatic : return append_unsafe_prefetch(callee, true, false);
3607 case vmIntrinsics::_prefetchWriteStatic : return append_unsafe_prefetch(callee, true, true);
3609 case vmIntrinsics::_checkIndex :
3610 if (!InlineNIOCheckIndex) return false;
3611 preserves_state = true;
3612 break;
3613 case vmIntrinsics::_putOrderedObject : return append_unsafe_put_obj(callee, T_OBJECT, true);
3614 case vmIntrinsics::_putOrderedInt : return append_unsafe_put_obj(callee, T_INT, true);
3615 case vmIntrinsics::_putOrderedLong : return append_unsafe_put_obj(callee, T_LONG, true);
3617 case vmIntrinsics::_compareAndSwapLong:
3618 if (!VM_Version::supports_cx8()) return false;
3619 // fall through
3620 case vmIntrinsics::_compareAndSwapInt:
3621 case vmIntrinsics::_compareAndSwapObject:
3622 append_unsafe_CAS(callee);
3623 return true;
3625 case vmIntrinsics::_getAndAddInt:
3626 if (!VM_Version::supports_atomic_getadd4()) {
3627 return false;
3628 }
3629 return append_unsafe_get_and_set_obj(callee, true);
3630 case vmIntrinsics::_getAndAddLong:
3631 if (!VM_Version::supports_atomic_getadd8()) {
3632 return false;
3633 }
3634 return append_unsafe_get_and_set_obj(callee, true);
3635 case vmIntrinsics::_getAndSetInt:
3636 if (!VM_Version::supports_atomic_getset4()) {
3637 return false;
3638 }
3639 return append_unsafe_get_and_set_obj(callee, false);
3640 case vmIntrinsics::_getAndSetLong:
3641 if (!VM_Version::supports_atomic_getset8()) {
3642 return false;
3643 }
3644 return append_unsafe_get_and_set_obj(callee, false);
3645 case vmIntrinsics::_getAndSetObject:
3646 #ifdef _LP64
3647 if (!UseCompressedOops && !VM_Version::supports_atomic_getset8()) {
3648 return false;
3649 }
3650 if (UseCompressedOops && !VM_Version::supports_atomic_getset4()) {
3651 return false;
3652 }
3653 #else
3654 if (!VM_Version::supports_atomic_getset4()) {
3655 return false;
3656 }
3657 #endif
3658 return append_unsafe_get_and_set_obj(callee, false);
3660 case vmIntrinsics::_Reference_get:
3661 // Use the intrinsic version of Reference.get() so that the value in
3662 // the referent field can be registered by the G1 pre-barrier code.
3663 // Also to prevent commoning reads from this field across safepoint
3664 // since GC can change its value.
3665 preserves_state = true;
3666 break;
3668 case vmIntrinsics::_updateCRC32:
3669 case vmIntrinsics::_updateBytesCRC32:
3670 case vmIntrinsics::_updateByteBufferCRC32:
3671 if (!UseCRC32Intrinsics) return false;
3672 cantrap = false;
3673 preserves_state = true;
3674 break;
3676 case vmIntrinsics::_loadFence :
3677 case vmIntrinsics::_storeFence:
3678 case vmIntrinsics::_fullFence :
3679 break;
3681 default : return false; // do not inline
3682 }
3683 // create intrinsic node
3684 const bool has_receiver = !callee->is_static();
3685 ValueType* result_type = as_ValueType(callee->return_type());
3686 ValueStack* state_before = copy_state_for_exception();
3688 Values* args = state()->pop_arguments(callee->arg_size());
3690 if (is_profiling()) {
3691 // Don't profile in the special case where the root method
3692 // is the intrinsic
3693 if (callee != method()) {
3694 // Note that we'd collect profile data in this method if we wanted it.
3695 compilation()->set_would_profile(true);
3696 if (profile_calls()) {
3697 Value recv = NULL;
3698 if (has_receiver) {
3699 recv = args->at(0);
3700 null_check(recv);
3701 }
3702 profile_call(callee, recv, NULL, collect_args_for_profiling(args, callee, true), true);
3703 }
3704 }
3705 }
3707 Intrinsic* result = new Intrinsic(result_type, id, args, has_receiver, state_before,
3708 preserves_state, cantrap);
3709 // append instruction & push result
3710 Value value = append_split(result);
3711 if (result_type != voidType) push(result_type, value);
3713 if (callee != method() && profile_return() && result_type->is_object_kind()) {
3714 profile_return_type(result, callee);
3715 }
3717 // done
3718 return true;
3719 }
3722 bool GraphBuilder::try_inline_jsr(int jsr_dest_bci) {
3723 // Introduce a new callee continuation point - all Ret instructions
3724 // will be replaced with Gotos to this point.
3725 BlockBegin* cont = block_at(next_bci());
3726 assert(cont != NULL, "continuation must exist (BlockListBuilder starts a new block after a jsr");
3728 // Note: can not assign state to continuation yet, as we have to
3729 // pick up the state from the Ret instructions.
3731 // Push callee scope
3732 push_scope_for_jsr(cont, jsr_dest_bci);
3734 // Temporarily set up bytecode stream so we can append instructions
3735 // (only using the bci of this stream)
3736 scope_data()->set_stream(scope_data()->parent()->stream());
3738 BlockBegin* jsr_start_block = block_at(jsr_dest_bci);
3739 assert(jsr_start_block != NULL, "jsr start block must exist");
3740 assert(!jsr_start_block->is_set(BlockBegin::was_visited_flag), "should not have visited jsr yet");
3741 Goto* goto_sub = new Goto(jsr_start_block, false);
3742 // Must copy state to avoid wrong sharing when parsing bytecodes
3743 assert(jsr_start_block->state() == NULL, "should have fresh jsr starting block");
3744 jsr_start_block->set_state(copy_state_before_with_bci(jsr_dest_bci));
3745 append(goto_sub);
3746 _block->set_end(goto_sub);
3747 _last = _block = jsr_start_block;
3749 // Clear out bytecode stream
3750 scope_data()->set_stream(NULL);
3752 scope_data()->add_to_work_list(jsr_start_block);
3754 // Ready to resume parsing in subroutine
3755 iterate_all_blocks();
3757 // If we bailed out during parsing, return immediately (this is bad news)
3758 CHECK_BAILOUT_(false);
3760 // Detect whether the continuation can actually be reached. If not,
3761 // it has not had state set by the join() operations in
3762 // iterate_bytecodes_for_block()/ret() and we should not touch the
3763 // iteration state. The calling activation of
3764 // iterate_bytecodes_for_block will then complete normally.
3765 if (cont->state() != NULL) {
3766 if (!cont->is_set(BlockBegin::was_visited_flag)) {
3767 // add continuation to work list instead of parsing it immediately
3768 scope_data()->parent()->add_to_work_list(cont);
3769 }
3770 }
3772 assert(jsr_continuation() == cont, "continuation must not have changed");
3773 assert(!jsr_continuation()->is_set(BlockBegin::was_visited_flag) ||
3774 jsr_continuation()->is_set(BlockBegin::parser_loop_header_flag),
3775 "continuation can only be visited in case of backward branches");
3776 assert(_last && _last->as_BlockEnd(), "block must have end");
3778 // continuation is in work list, so end iteration of current block
3779 _skip_block = true;
3780 pop_scope_for_jsr();
3782 return true;
3783 }
3786 // Inline the entry of a synchronized method as a monitor enter and
3787 // register the exception handler which releases the monitor if an
3788 // exception is thrown within the callee. Note that the monitor enter
3789 // cannot throw an exception itself, because the receiver is
3790 // guaranteed to be non-null by the explicit null check at the
3791 // beginning of inlining.
3792 void GraphBuilder::inline_sync_entry(Value lock, BlockBegin* sync_handler) {
3793 assert(lock != NULL && sync_handler != NULL, "lock or handler missing");
3795 monitorenter(lock, SynchronizationEntryBCI);
3796 assert(_last->as_MonitorEnter() != NULL, "monitor enter expected");
3797 _last->set_needs_null_check(false);
3799 sync_handler->set(BlockBegin::exception_entry_flag);
3800 sync_handler->set(BlockBegin::is_on_work_list_flag);
3802 ciExceptionHandler* desc = new ciExceptionHandler(method()->holder(), 0, method()->code_size(), -1, 0);
3803 XHandler* h = new XHandler(desc);
3804 h->set_entry_block(sync_handler);
3805 scope_data()->xhandlers()->append(h);
3806 scope_data()->set_has_handler();
3807 }
3810 // If an exception is thrown and not handled within an inlined
3811 // synchronized method, the monitor must be released before the
3812 // exception is rethrown in the outer scope. Generate the appropriate
3813 // instructions here.
3814 void GraphBuilder::fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler) {
3815 BlockBegin* orig_block = _block;
3816 ValueStack* orig_state = _state;
3817 Instruction* orig_last = _last;
3818 _last = _block = sync_handler;
3819 _state = sync_handler->state()->copy();
3821 assert(sync_handler != NULL, "handler missing");
3822 assert(!sync_handler->is_set(BlockBegin::was_visited_flag), "is visited here");
3824 assert(lock != NULL || default_handler, "lock or handler missing");
3826 XHandler* h = scope_data()->xhandlers()->remove_last();
3827 assert(h->entry_block() == sync_handler, "corrupt list of handlers");
3829 block()->set(BlockBegin::was_visited_flag);
3830 Value exception = append_with_bci(new ExceptionObject(), SynchronizationEntryBCI);
3831 assert(exception->is_pinned(), "must be");
3833 int bci = SynchronizationEntryBCI;
3834 if (compilation()->env()->dtrace_method_probes()) {
3835 // Report exit from inline methods. We don't have a stream here
3836 // so pass an explicit bci of SynchronizationEntryBCI.
3837 Values* args = new Values(1);
3838 args->push(append_with_bci(new Constant(new MethodConstant(method())), bci));
3839 append_with_bci(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args), bci);
3840 }
3842 if (lock) {
3843 assert(state()->locks_size() > 0 && state()->lock_at(state()->locks_size() - 1) == lock, "lock is missing");
3844 if (!lock->is_linked()) {
3845 lock = append_with_bci(lock, bci);
3846 }
3848 // exit the monitor in the context of the synchronized method
3849 monitorexit(lock, bci);
3851 // exit the context of the synchronized method
3852 if (!default_handler) {
3853 pop_scope();
3854 bci = _state->caller_state()->bci();
3855 _state = _state->caller_state()->copy_for_parsing();
3856 }
3857 }
3859 // perform the throw as if at the the call site
3860 apush(exception);
3861 throw_op(bci);
3863 BlockEnd* end = last()->as_BlockEnd();
3864 block()->set_end(end);
3866 _block = orig_block;
3867 _state = orig_state;
3868 _last = orig_last;
3869 }
3872 bool GraphBuilder::try_inline_full(ciMethod* callee, bool holder_known, Bytecodes::Code bc, Value receiver) {
3873 assert(!callee->is_native(), "callee must not be native");
3874 if (CompilationPolicy::policy()->should_not_inline(compilation()->env(), callee)) {
3875 INLINE_BAILOUT("inlining prohibited by policy");
3876 }
3877 // first perform tests of things it's not possible to inline
3878 if (callee->has_exception_handlers() &&
3879 !InlineMethodsWithExceptionHandlers) INLINE_BAILOUT("callee has exception handlers");
3880 if (callee->is_synchronized() &&
3881 !InlineSynchronizedMethods ) INLINE_BAILOUT("callee is synchronized");
3882 if (!callee->holder()->is_initialized()) INLINE_BAILOUT("callee's klass not initialized yet");
3883 if (!callee->has_balanced_monitors()) INLINE_BAILOUT("callee's monitors do not match");
3885 // Proper inlining of methods with jsrs requires a little more work.
3886 if (callee->has_jsrs() ) INLINE_BAILOUT("jsrs not handled properly by inliner yet");
3888 // When SSE2 is used on intel, then no special handling is needed
3889 // for strictfp because the enum-constant is fixed at compile time,
3890 // the check for UseSSE2 is needed here
3891 if (strict_fp_requires_explicit_rounding && UseSSE < 2 && method()->is_strict() != callee->is_strict()) {
3892 INLINE_BAILOUT("caller and callee have different strict fp requirements");
3893 }
3895 if (is_profiling() && !callee->ensure_method_data()) {
3896 INLINE_BAILOUT("mdo allocation failed");
3897 }
3899 // now perform tests that are based on flag settings
3900 if (callee->force_inline() || callee->should_inline()) {
3901 if (inline_level() > MaxForceInlineLevel ) INLINE_BAILOUT("MaxForceInlineLevel");
3902 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep");
3904 const char* msg = "";
3905 if (callee->force_inline()) msg = "force inline by annotation";
3906 if (callee->should_inline()) msg = "force inline by CompileOracle";
3907 print_inlining(callee, msg);
3908 } else {
3909 // use heuristic controls on inlining
3910 if (inline_level() > MaxInlineLevel ) INLINE_BAILOUT("inlining too deep");
3911 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep");
3912 if (callee->code_size_for_inlining() > max_inline_size() ) INLINE_BAILOUT("callee is too large");
3914 // don't inline throwable methods unless the inlining tree is rooted in a throwable class
3915 if (callee->name() == ciSymbol::object_initializer_name() &&
3916 callee->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
3917 // Throwable constructor call
3918 IRScope* top = scope();
3919 while (top->caller() != NULL) {
3920 top = top->caller();
3921 }
3922 if (!top->method()->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
3923 INLINE_BAILOUT("don't inline Throwable constructors");
3924 }
3925 }
3927 if (compilation()->env()->num_inlined_bytecodes() > DesiredMethodLimit) {
3928 INLINE_BAILOUT("total inlining greater than DesiredMethodLimit");
3929 }
3930 // printing
3931 print_inlining(callee);
3932 }
3934 // NOTE: Bailouts from this point on, which occur at the
3935 // GraphBuilder level, do not cause bailout just of the inlining but
3936 // in fact of the entire compilation.
3938 BlockBegin* orig_block = block();
3940 const bool is_invokedynamic = bc == Bytecodes::_invokedynamic;
3941 const bool has_receiver = (bc != Bytecodes::_invokestatic && !is_invokedynamic);
3943 const int args_base = state()->stack_size() - callee->arg_size();
3944 assert(args_base >= 0, "stack underflow during inlining");
3946 // Insert null check if necessary
3947 Value recv = NULL;
3948 if (has_receiver) {
3949 // note: null check must happen even if first instruction of callee does
3950 // an implicit null check since the callee is in a different scope
3951 // and we must make sure exception handling does the right thing
3952 assert(!callee->is_static(), "callee must not be static");
3953 assert(callee->arg_size() > 0, "must have at least a receiver");
3954 recv = state()->stack_at(args_base);
3955 null_check(recv);
3956 }
3958 if (is_profiling()) {
3959 // Note that we'd collect profile data in this method if we wanted it.
3960 // this may be redundant here...
3961 compilation()->set_would_profile(true);
3963 if (profile_calls()) {
3964 int start = 0;
3965 Values* obj_args = args_list_for_profiling(callee, start, has_receiver);
3966 if (obj_args != NULL) {
3967 int s = obj_args->size();
3968 // if called through method handle invoke, some arguments may have been popped
3969 for (int i = args_base+start, j = 0; j < obj_args->size() && i < state()->stack_size(); ) {
3970 Value v = state()->stack_at_inc(i);
3971 if (v->type()->is_object_kind()) {
3972 obj_args->push(v);
3973 j++;
3974 }
3975 }
3976 check_args_for_profiling(obj_args, s);
3977 }
3978 profile_call(callee, recv, holder_known ? callee->holder() : NULL, obj_args, true);
3979 }
3980 }
3982 // Introduce a new callee continuation point - if the callee has
3983 // more than one return instruction or the return does not allow
3984 // fall-through of control flow, all return instructions of the
3985 // callee will need to be replaced by Goto's pointing to this
3986 // continuation point.
3987 BlockBegin* cont = block_at(next_bci());
3988 bool continuation_existed = true;
3989 if (cont == NULL) {
3990 cont = new BlockBegin(next_bci());
3991 // low number so that continuation gets parsed as early as possible
3992 cont->set_depth_first_number(0);
3993 #ifndef PRODUCT
3994 if (PrintInitialBlockList) {
3995 tty->print_cr("CFG: created block %d (bci %d) as continuation for inline at bci %d",
3996 cont->block_id(), cont->bci(), bci());
3997 }
3998 #endif
3999 continuation_existed = false;
4000 }
4001 // Record number of predecessors of continuation block before
4002 // inlining, to detect if inlined method has edges to its
4003 // continuation after inlining.
4004 int continuation_preds = cont->number_of_preds();
4006 // Push callee scope
4007 push_scope(callee, cont);
4009 // the BlockListBuilder for the callee could have bailed out
4010 if (bailed_out())
4011 return false;
4013 // Temporarily set up bytecode stream so we can append instructions
4014 // (only using the bci of this stream)
4015 scope_data()->set_stream(scope_data()->parent()->stream());
4017 // Pass parameters into callee state: add assignments
4018 // note: this will also ensure that all arguments are computed before being passed
4019 ValueStack* callee_state = state();
4020 ValueStack* caller_state = state()->caller_state();
4021 for (int i = args_base; i < caller_state->stack_size(); ) {
4022 const int arg_no = i - args_base;
4023 Value arg = caller_state->stack_at_inc(i);
4024 store_local(callee_state, arg, arg_no);
4025 }
4027 // Remove args from stack.
4028 // Note that we preserve locals state in case we can use it later
4029 // (see use of pop_scope() below)
4030 caller_state->truncate_stack(args_base);
4031 assert(callee_state->stack_size() == 0, "callee stack must be empty");
4033 Value lock = NULL;
4034 BlockBegin* sync_handler = NULL;
4036 // Inline the locking of the receiver if the callee is synchronized
4037 if (callee->is_synchronized()) {
4038 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror())))
4039 : state()->local_at(0);
4040 sync_handler = new BlockBegin(SynchronizationEntryBCI);
4041 inline_sync_entry(lock, sync_handler);
4042 }
4044 if (compilation()->env()->dtrace_method_probes()) {
4045 Values* args = new Values(1);
4046 args->push(append(new Constant(new MethodConstant(method()))));
4047 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args));
4048 }
4050 if (profile_inlined_calls()) {
4051 profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI));
4052 }
4054 BlockBegin* callee_start_block = block_at(0);
4055 if (callee_start_block != NULL) {
4056 assert(callee_start_block->is_set(BlockBegin::parser_loop_header_flag), "must be loop header");
4057 Goto* goto_callee = new Goto(callee_start_block, false);
4058 // The state for this goto is in the scope of the callee, so use
4059 // the entry bci for the callee instead of the call site bci.
4060 append_with_bci(goto_callee, 0);
4061 _block->set_end(goto_callee);
4062 callee_start_block->merge(callee_state);
4064 _last = _block = callee_start_block;
4066 scope_data()->add_to_work_list(callee_start_block);
4067 }
4069 // Clear out bytecode stream
4070 scope_data()->set_stream(NULL);
4072 CompileLog* log = compilation()->log();
4073 if (log != NULL) log->head("parse method='%d'", log->identify(callee));
4075 // Ready to resume parsing in callee (either in the same block we
4076 // were in before or in the callee's start block)
4077 iterate_all_blocks(callee_start_block == NULL);
4079 if (log != NULL) log->done("parse");
4081 // If we bailed out during parsing, return immediately (this is bad news)
4082 if (bailed_out())
4083 return false;
4085 // iterate_all_blocks theoretically traverses in random order; in
4086 // practice, we have only traversed the continuation if we are
4087 // inlining into a subroutine
4088 assert(continuation_existed ||
4089 !continuation()->is_set(BlockBegin::was_visited_flag),
4090 "continuation should not have been parsed yet if we created it");
4092 // At this point we are almost ready to return and resume parsing of
4093 // the caller back in the GraphBuilder. The only thing we want to do
4094 // first is an optimization: during parsing of the callee we
4095 // generated at least one Goto to the continuation block. If we
4096 // generated exactly one, and if the inlined method spanned exactly
4097 // one block (and we didn't have to Goto its entry), then we snip
4098 // off the Goto to the continuation, allowing control to fall
4099 // through back into the caller block and effectively performing
4100 // block merging. This allows load elimination and CSE to take place
4101 // across multiple callee scopes if they are relatively simple, and
4102 // is currently essential to making inlining profitable.
4103 if (num_returns() == 1
4104 && block() == orig_block
4105 && block() == inline_cleanup_block()) {
4106 _last = inline_cleanup_return_prev();
4107 _state = inline_cleanup_state();
4108 } else if (continuation_preds == cont->number_of_preds()) {
4109 // Inlining caused that the instructions after the invoke in the
4110 // caller are not reachable any more. So skip filling this block
4111 // with instructions!
4112 assert(cont == continuation(), "");
4113 assert(_last && _last->as_BlockEnd(), "");
4114 _skip_block = true;
4115 } else {
4116 // Resume parsing in continuation block unless it was already parsed.
4117 // Note that if we don't change _last here, iteration in
4118 // iterate_bytecodes_for_block will stop when we return.
4119 if (!continuation()->is_set(BlockBegin::was_visited_flag)) {
4120 // add continuation to work list instead of parsing it immediately
4121 assert(_last && _last->as_BlockEnd(), "");
4122 scope_data()->parent()->add_to_work_list(continuation());
4123 _skip_block = true;
4124 }
4125 }
4127 // Fill the exception handler for synchronized methods with instructions
4128 if (callee->is_synchronized() && sync_handler->state() != NULL) {
4129 fill_sync_handler(lock, sync_handler);
4130 } else {
4131 pop_scope();
4132 }
4134 compilation()->notice_inlined_method(callee);
4136 return true;
4137 }
4140 bool GraphBuilder::try_method_handle_inline(ciMethod* callee) {
4141 ValueStack* state_before = state()->copy_for_parsing();
4142 vmIntrinsics::ID iid = callee->intrinsic_id();
4143 switch (iid) {
4144 case vmIntrinsics::_invokeBasic:
4145 {
4146 // get MethodHandle receiver
4147 const int args_base = state()->stack_size() - callee->arg_size();
4148 ValueType* type = state()->stack_at(args_base)->type();
4149 if (type->is_constant()) {
4150 ciMethod* target = type->as_ObjectType()->constant_value()->as_method_handle()->get_vmtarget();
4151 // We don't do CHA here so only inline static and statically bindable methods.
4152 if (target->is_static() || target->can_be_statically_bound()) {
4153 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual;
4154 if (try_inline(target, /*holder_known*/ true, bc)) {
4155 return true;
4156 }
4157 } else {
4158 print_inlining(target, "not static or statically bindable", /*success*/ false);
4159 }
4160 } else {
4161 print_inlining(callee, "receiver not constant", /*success*/ false);
4162 }
4163 }
4164 break;
4166 case vmIntrinsics::_linkToVirtual:
4167 case vmIntrinsics::_linkToStatic:
4168 case vmIntrinsics::_linkToSpecial:
4169 case vmIntrinsics::_linkToInterface:
4170 {
4171 // pop MemberName argument
4172 const int args_base = state()->stack_size() - callee->arg_size();
4173 ValueType* type = apop()->type();
4174 if (type->is_constant()) {
4175 ciMethod* target = type->as_ObjectType()->constant_value()->as_member_name()->get_vmtarget();
4176 // If the target is another method handle invoke, try to recursively get
4177 // a better target.
4178 if (target->is_method_handle_intrinsic()) {
4179 if (try_method_handle_inline(target)) {
4180 return true;
4181 }
4182 } else {
4183 ciSignature* signature = target->signature();
4184 const int receiver_skip = target->is_static() ? 0 : 1;
4185 // Cast receiver to its type.
4186 if (!target->is_static()) {
4187 ciKlass* tk = signature->accessing_klass();
4188 Value obj = state()->stack_at(args_base);
4189 if (obj->exact_type() == NULL &&
4190 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) {
4191 TypeCast* c = new TypeCast(tk, obj, state_before);
4192 append(c);
4193 state()->stack_at_put(args_base, c);
4194 }
4195 }
4196 // Cast reference arguments to its type.
4197 for (int i = 0, j = 0; i < signature->count(); i++) {
4198 ciType* t = signature->type_at(i);
4199 if (t->is_klass()) {
4200 ciKlass* tk = t->as_klass();
4201 Value obj = state()->stack_at(args_base + receiver_skip + j);
4202 if (obj->exact_type() == NULL &&
4203 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) {
4204 TypeCast* c = new TypeCast(t, obj, state_before);
4205 append(c);
4206 state()->stack_at_put(args_base + receiver_skip + j, c);
4207 }
4208 }
4209 j += t->size(); // long and double take two slots
4210 }
4211 // We don't do CHA here so only inline static and statically bindable methods.
4212 if (target->is_static() || target->can_be_statically_bound()) {
4213 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual;
4214 if (try_inline(target, /*holder_known*/ true, bc)) {
4215 return true;
4216 }
4217 } else {
4218 print_inlining(target, "not static or statically bindable", /*success*/ false);
4219 }
4220 }
4221 } else {
4222 print_inlining(callee, "MemberName not constant", /*success*/ false);
4223 }
4224 }
4225 break;
4227 default:
4228 fatal(err_msg("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
4229 break;
4230 }
4231 set_state(state_before);
4232 return false;
4233 }
4236 void GraphBuilder::inline_bailout(const char* msg) {
4237 assert(msg != NULL, "inline bailout msg must exist");
4238 _inline_bailout_msg = msg;
4239 }
4242 void GraphBuilder::clear_inline_bailout() {
4243 _inline_bailout_msg = NULL;
4244 }
4247 void GraphBuilder::push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start) {
4248 ScopeData* data = new ScopeData(NULL);
4249 data->set_scope(scope);
4250 data->set_bci2block(bci2block);
4251 _scope_data = data;
4252 _block = start;
4253 }
4256 void GraphBuilder::push_scope(ciMethod* callee, BlockBegin* continuation) {
4257 IRScope* callee_scope = new IRScope(compilation(), scope(), bci(), callee, -1, false);
4258 scope()->add_callee(callee_scope);
4260 BlockListBuilder blb(compilation(), callee_scope, -1);
4261 CHECK_BAILOUT();
4263 if (!blb.bci2block()->at(0)->is_set(BlockBegin::parser_loop_header_flag)) {
4264 // this scope can be inlined directly into the caller so remove
4265 // the block at bci 0.
4266 blb.bci2block()->at_put(0, NULL);
4267 }
4269 set_state(new ValueStack(callee_scope, state()->copy(ValueStack::CallerState, bci())));
4271 ScopeData* data = new ScopeData(scope_data());
4272 data->set_scope(callee_scope);
4273 data->set_bci2block(blb.bci2block());
4274 data->set_continuation(continuation);
4275 _scope_data = data;
4276 }
4279 void GraphBuilder::push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci) {
4280 ScopeData* data = new ScopeData(scope_data());
4281 data->set_parsing_jsr();
4282 data->set_jsr_entry_bci(jsr_dest_bci);
4283 data->set_jsr_return_address_local(-1);
4284 // Must clone bci2block list as we will be mutating it in order to
4285 // properly clone all blocks in jsr region as well as exception
4286 // handlers containing rets
4287 BlockList* new_bci2block = new BlockList(bci2block()->length());
4288 new_bci2block->push_all(bci2block());
4289 data->set_bci2block(new_bci2block);
4290 data->set_scope(scope());
4291 data->setup_jsr_xhandlers();
4292 data->set_continuation(continuation());
4293 data->set_jsr_continuation(jsr_continuation);
4294 _scope_data = data;
4295 }
4298 void GraphBuilder::pop_scope() {
4299 int number_of_locks = scope()->number_of_locks();
4300 _scope_data = scope_data()->parent();
4301 // accumulate minimum number of monitor slots to be reserved
4302 scope()->set_min_number_of_locks(number_of_locks);
4303 }
4306 void GraphBuilder::pop_scope_for_jsr() {
4307 _scope_data = scope_data()->parent();
4308 }
4310 bool GraphBuilder::append_unsafe_get_obj(ciMethod* callee, BasicType t, bool is_volatile) {
4311 if (InlineUnsafeOps) {
4312 Values* args = state()->pop_arguments(callee->arg_size());
4313 null_check(args->at(0));
4314 Instruction* offset = args->at(2);
4315 #ifndef _LP64
4316 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4317 #endif
4318 Instruction* op = append(new UnsafeGetObject(t, args->at(1), offset, is_volatile));
4319 push(op->type(), op);
4320 compilation()->set_has_unsafe_access(true);
4321 }
4322 return InlineUnsafeOps;
4323 }
4326 bool GraphBuilder::append_unsafe_put_obj(ciMethod* callee, BasicType t, bool is_volatile) {
4327 if (InlineUnsafeOps) {
4328 Values* args = state()->pop_arguments(callee->arg_size());
4329 null_check(args->at(0));
4330 Instruction* offset = args->at(2);
4331 #ifndef _LP64
4332 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4333 #endif
4334 Value val = args->at(3);
4335 if (t == T_BOOLEAN) {
4336 Value mask = append(new Constant(new IntConstant(1)));
4337 val = append(new LogicOp(Bytecodes::_iand, val, mask));
4338 }
4339 Instruction* op = append(new UnsafePutObject(t, args->at(1), offset, val, is_volatile));
4340 compilation()->set_has_unsafe_access(true);
4341 kill_all();
4342 }
4343 return InlineUnsafeOps;
4344 }
4347 bool GraphBuilder::append_unsafe_get_raw(ciMethod* callee, BasicType t) {
4348 if (InlineUnsafeOps) {
4349 Values* args = state()->pop_arguments(callee->arg_size());
4350 null_check(args->at(0));
4351 Instruction* op = append(new UnsafeGetRaw(t, args->at(1), false));
4352 push(op->type(), op);
4353 compilation()->set_has_unsafe_access(true);
4354 }
4355 return InlineUnsafeOps;
4356 }
4359 bool GraphBuilder::append_unsafe_put_raw(ciMethod* callee, BasicType t) {
4360 if (InlineUnsafeOps) {
4361 Values* args = state()->pop_arguments(callee->arg_size());
4362 null_check(args->at(0));
4363 Instruction* op = append(new UnsafePutRaw(t, args->at(1), args->at(2)));
4364 compilation()->set_has_unsafe_access(true);
4365 }
4366 return InlineUnsafeOps;
4367 }
4370 bool GraphBuilder::append_unsafe_prefetch(ciMethod* callee, bool is_static, bool is_store) {
4371 if (InlineUnsafeOps) {
4372 Values* args = state()->pop_arguments(callee->arg_size());
4373 int obj_arg_index = 1; // Assume non-static case
4374 if (is_static) {
4375 obj_arg_index = 0;
4376 } else {
4377 null_check(args->at(0));
4378 }
4379 Instruction* offset = args->at(obj_arg_index + 1);
4380 #ifndef _LP64
4381 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4382 #endif
4383 Instruction* op = is_store ? append(new UnsafePrefetchWrite(args->at(obj_arg_index), offset))
4384 : append(new UnsafePrefetchRead (args->at(obj_arg_index), offset));
4385 compilation()->set_has_unsafe_access(true);
4386 }
4387 return InlineUnsafeOps;
4388 }
4391 void GraphBuilder::append_unsafe_CAS(ciMethod* callee) {
4392 ValueStack* state_before = copy_state_for_exception();
4393 ValueType* result_type = as_ValueType(callee->return_type());
4394 assert(result_type->is_int(), "int result");
4395 Values* args = state()->pop_arguments(callee->arg_size());
4397 // Pop off some args to speically handle, then push back
4398 Value newval = args->pop();
4399 Value cmpval = args->pop();
4400 Value offset = args->pop();
4401 Value src = args->pop();
4402 Value unsafe_obj = args->pop();
4404 // Separately handle the unsafe arg. It is not needed for code
4405 // generation, but must be null checked
4406 null_check(unsafe_obj);
4408 #ifndef _LP64
4409 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4410 #endif
4412 args->push(src);
4413 args->push(offset);
4414 args->push(cmpval);
4415 args->push(newval);
4417 // An unsafe CAS can alias with other field accesses, but we don't
4418 // know which ones so mark the state as no preserved. This will
4419 // cause CSE to invalidate memory across it.
4420 bool preserves_state = false;
4421 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), args, false, state_before, preserves_state);
4422 append_split(result);
4423 push(result_type, result);
4424 compilation()->set_has_unsafe_access(true);
4425 }
4428 static void post_inlining_event(EventCompilerInlining* event,
4429 int compile_id,
4430 const char* msg,
4431 bool success,
4432 int bci,
4433 ciMethod* caller,
4434 ciMethod* callee) {
4435 assert(caller != NULL, "invariant");
4436 assert(callee != NULL, "invariant");
4437 assert(event != NULL, "invariant");
4438 assert(event->should_commit(), "invariant");
4439 JfrStructCalleeMethod callee_struct;
4440 callee_struct.set_type(callee->holder()->name()->as_utf8());
4441 callee_struct.set_name(callee->name()->as_utf8());
4442 callee_struct.set_descriptor(callee->signature()->as_symbol()->as_utf8());
4443 event->set_compileId(compile_id);
4444 event->set_message(msg);
4445 event->set_succeeded(success);
4446 event->set_bci(bci);
4447 event->set_caller(caller->get_Method());
4448 event->set_callee(callee_struct);
4449 event->commit();
4450 }
4452 void GraphBuilder::print_inlining(ciMethod* callee, const char* msg, bool success) {
4453 CompileLog* log = compilation()->log();
4454 if (log != NULL) {
4455 if (success) {
4456 if (msg != NULL)
4457 log->inline_success(msg);
4458 else
4459 log->inline_success("receiver is statically known");
4460 } else {
4461 if (msg != NULL)
4462 log->inline_fail(msg);
4463 else
4464 log->inline_fail("reason unknown");
4465 }
4466 }
4468 EventCompilerInlining event;
4469 if (event.should_commit()) {
4470 post_inlining_event(&event, compilation()->env()->task()->compile_id(), msg, success, bci(), method(), callee);
4471 }
4473 if (!PrintInlining && !compilation()->method()->has_option("PrintInlining")) {
4474 return;
4475 }
4476 CompileTask::print_inlining(callee, scope()->level(), bci(), msg);
4477 if (success && CIPrintMethodCodes) {
4478 callee->print_codes();
4479 }
4480 }
4482 bool GraphBuilder::append_unsafe_get_and_set_obj(ciMethod* callee, bool is_add) {
4483 if (InlineUnsafeOps) {
4484 Values* args = state()->pop_arguments(callee->arg_size());
4485 BasicType t = callee->return_type()->basic_type();
4486 null_check(args->at(0));
4487 Instruction* offset = args->at(2);
4488 #ifndef _LP64
4489 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
4490 #endif
4491 Instruction* op = append(new UnsafeGetAndSetObject(t, args->at(1), offset, args->at(3), is_add));
4492 compilation()->set_has_unsafe_access(true);
4493 kill_all();
4494 push(op->type(), op);
4495 }
4496 return InlineUnsafeOps;
4497 }
4499 #ifndef PRODUCT
4500 void GraphBuilder::print_stats() {
4501 vmap()->print();
4502 }
4503 #endif // PRODUCT
4505 void GraphBuilder::profile_call(ciMethod* callee, Value recv, ciKlass* known_holder, Values* obj_args, bool inlined) {
4506 assert(known_holder == NULL || (known_holder->is_instance_klass() &&
4507 (!known_holder->is_interface() ||
4508 ((ciInstanceKlass*)known_holder)->has_default_methods())), "should be default method");
4509 if (known_holder != NULL) {
4510 if (known_holder->exact_klass() == NULL) {
4511 known_holder = compilation()->cha_exact_type(known_holder);
4512 }
4513 }
4515 append(new ProfileCall(method(), bci(), callee, recv, known_holder, obj_args, inlined));
4516 }
4518 void GraphBuilder::profile_return_type(Value ret, ciMethod* callee, ciMethod* m, int invoke_bci) {
4519 assert((m == NULL) == (invoke_bci < 0), "invalid method and invalid bci together");
4520 if (m == NULL) {
4521 m = method();
4522 }
4523 if (invoke_bci < 0) {
4524 invoke_bci = bci();
4525 }
4526 ciMethodData* md = m->method_data_or_null();
4527 ciProfileData* data = md->bci_to_data(invoke_bci);
4528 if (data != NULL && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) {
4529 append(new ProfileReturnType(m , invoke_bci, callee, ret));
4530 }
4531 }
4533 void GraphBuilder::profile_invocation(ciMethod* callee, ValueStack* state) {
4534 append(new ProfileInvoke(callee, state));
4535 }