Wed, 02 Feb 2011 11:35:26 -0500
7016023: Enable building ARM and PPC from src/closed repository
Reviewed-by: dholmes, bdelsart
1 /*
2 * Copyright (c) 1999, 2011, 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/ciField.hpp"
32 #include "ci/ciKlass.hpp"
33 #include "interpreter/bytecode.hpp"
34 #include "runtime/sharedRuntime.hpp"
35 #include "utilities/bitMap.inline.hpp"
37 class BlockListBuilder VALUE_OBJ_CLASS_SPEC {
38 private:
39 Compilation* _compilation;
40 IRScope* _scope;
42 BlockList _blocks; // internal list of all blocks
43 BlockList* _bci2block; // mapping from bci to blocks for GraphBuilder
45 // fields used by mark_loops
46 BitMap _active; // for iteration of control flow graph
47 BitMap _visited; // for iteration of control flow graph
48 intArray _loop_map; // caches the information if a block is contained in a loop
49 int _next_loop_index; // next free loop number
50 int _next_block_number; // for reverse postorder numbering of blocks
52 // accessors
53 Compilation* compilation() const { return _compilation; }
54 IRScope* scope() const { return _scope; }
55 ciMethod* method() const { return scope()->method(); }
56 XHandlers* xhandlers() const { return scope()->xhandlers(); }
58 // unified bailout support
59 void bailout(const char* msg) const { compilation()->bailout(msg); }
60 bool bailed_out() const { return compilation()->bailed_out(); }
62 // helper functions
63 BlockBegin* make_block_at(int bci, BlockBegin* predecessor);
64 void handle_exceptions(BlockBegin* current, int cur_bci);
65 void handle_jsr(BlockBegin* current, int sr_bci, int next_bci);
66 void store_one(BlockBegin* current, int local);
67 void store_two(BlockBegin* current, int local);
68 void set_entries(int osr_bci);
69 void set_leaders();
71 void make_loop_header(BlockBegin* block);
72 void mark_loops();
73 int mark_loops(BlockBegin* b, bool in_subroutine);
75 // debugging
76 #ifndef PRODUCT
77 void print();
78 #endif
80 public:
81 // creation
82 BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci);
84 // accessors for GraphBuilder
85 BlockList* bci2block() const { return _bci2block; }
86 };
89 // Implementation of BlockListBuilder
91 BlockListBuilder::BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci)
92 : _compilation(compilation)
93 , _scope(scope)
94 , _blocks(16)
95 , _bci2block(new BlockList(scope->method()->code_size(), NULL))
96 , _next_block_number(0)
97 , _active() // size not known yet
98 , _visited() // size not known yet
99 , _next_loop_index(0)
100 , _loop_map() // size not known yet
101 {
102 set_entries(osr_bci);
103 set_leaders();
104 CHECK_BAILOUT();
106 mark_loops();
107 NOT_PRODUCT(if (PrintInitialBlockList) print());
109 #ifndef PRODUCT
110 if (PrintCFGToFile) {
111 stringStream title;
112 title.print("BlockListBuilder ");
113 scope->method()->print_name(&title);
114 CFGPrinter::print_cfg(_bci2block, title.as_string(), false, false);
115 }
116 #endif
117 }
120 void BlockListBuilder::set_entries(int osr_bci) {
121 // generate start blocks
122 BlockBegin* std_entry = make_block_at(0, NULL);
123 if (scope()->caller() == NULL) {
124 std_entry->set(BlockBegin::std_entry_flag);
125 }
126 if (osr_bci != -1) {
127 BlockBegin* osr_entry = make_block_at(osr_bci, NULL);
128 osr_entry->set(BlockBegin::osr_entry_flag);
129 }
131 // generate exception entry blocks
132 XHandlers* list = xhandlers();
133 const int n = list->length();
134 for (int i = 0; i < n; i++) {
135 XHandler* h = list->handler_at(i);
136 BlockBegin* entry = make_block_at(h->handler_bci(), NULL);
137 entry->set(BlockBegin::exception_entry_flag);
138 h->set_entry_block(entry);
139 }
140 }
143 BlockBegin* BlockListBuilder::make_block_at(int cur_bci, BlockBegin* predecessor) {
144 assert(method()->bci_block_start().at(cur_bci), "wrong block starts of MethodLivenessAnalyzer");
146 BlockBegin* block = _bci2block->at(cur_bci);
147 if (block == NULL) {
148 block = new BlockBegin(cur_bci);
149 block->init_stores_to_locals(method()->max_locals());
150 _bci2block->at_put(cur_bci, block);
151 _blocks.append(block);
153 assert(predecessor == NULL || predecessor->bci() < cur_bci, "targets for backward branches must already exist");
154 }
156 if (predecessor != NULL) {
157 if (block->is_set(BlockBegin::exception_entry_flag)) {
158 BAILOUT_("Exception handler can be reached by both normal and exceptional control flow", block);
159 }
161 predecessor->add_successor(block);
162 block->increment_total_preds();
163 }
165 return block;
166 }
169 inline void BlockListBuilder::store_one(BlockBegin* current, int local) {
170 current->stores_to_locals().set_bit(local);
171 }
172 inline void BlockListBuilder::store_two(BlockBegin* current, int local) {
173 store_one(current, local);
174 store_one(current, local + 1);
175 }
178 void BlockListBuilder::handle_exceptions(BlockBegin* current, int cur_bci) {
179 // Draws edges from a block to its exception handlers
180 XHandlers* list = xhandlers();
181 const int n = list->length();
183 for (int i = 0; i < n; i++) {
184 XHandler* h = list->handler_at(i);
186 if (h->covers(cur_bci)) {
187 BlockBegin* entry = h->entry_block();
188 assert(entry != NULL && entry == _bci2block->at(h->handler_bci()), "entry must be set");
189 assert(entry->is_set(BlockBegin::exception_entry_flag), "flag must be set");
191 // add each exception handler only once
192 if (!current->is_successor(entry)) {
193 current->add_successor(entry);
194 entry->increment_total_preds();
195 }
197 // stop when reaching catchall
198 if (h->catch_type() == 0) break;
199 }
200 }
201 }
203 void BlockListBuilder::handle_jsr(BlockBegin* current, int sr_bci, int next_bci) {
204 // start a new block after jsr-bytecode and link this block into cfg
205 make_block_at(next_bci, current);
207 // start a new block at the subroutine entry at mark it with special flag
208 BlockBegin* sr_block = make_block_at(sr_bci, current);
209 if (!sr_block->is_set(BlockBegin::subroutine_entry_flag)) {
210 sr_block->set(BlockBegin::subroutine_entry_flag);
211 }
212 }
215 void BlockListBuilder::set_leaders() {
216 bool has_xhandlers = xhandlers()->has_handlers();
217 BlockBegin* current = NULL;
219 // The information which bci starts a new block simplifies the analysis
220 // Without it, backward branches could jump to a bci where no block was created
221 // during bytecode iteration. This would require the creation of a new block at the
222 // branch target and a modification of the successor lists.
223 BitMap bci_block_start = method()->bci_block_start();
225 ciBytecodeStream s(method());
226 while (s.next() != ciBytecodeStream::EOBC()) {
227 int cur_bci = s.cur_bci();
229 if (bci_block_start.at(cur_bci)) {
230 current = make_block_at(cur_bci, current);
231 }
232 assert(current != NULL, "must have current block");
234 if (has_xhandlers && GraphBuilder::can_trap(method(), s.cur_bc())) {
235 handle_exceptions(current, cur_bci);
236 }
238 switch (s.cur_bc()) {
239 // track stores to local variables for selective creation of phi functions
240 case Bytecodes::_iinc: store_one(current, s.get_index()); break;
241 case Bytecodes::_istore: store_one(current, s.get_index()); break;
242 case Bytecodes::_lstore: store_two(current, s.get_index()); break;
243 case Bytecodes::_fstore: store_one(current, s.get_index()); break;
244 case Bytecodes::_dstore: store_two(current, s.get_index()); break;
245 case Bytecodes::_astore: store_one(current, s.get_index()); break;
246 case Bytecodes::_istore_0: store_one(current, 0); break;
247 case Bytecodes::_istore_1: store_one(current, 1); break;
248 case Bytecodes::_istore_2: store_one(current, 2); break;
249 case Bytecodes::_istore_3: store_one(current, 3); break;
250 case Bytecodes::_lstore_0: store_two(current, 0); break;
251 case Bytecodes::_lstore_1: store_two(current, 1); break;
252 case Bytecodes::_lstore_2: store_two(current, 2); break;
253 case Bytecodes::_lstore_3: store_two(current, 3); break;
254 case Bytecodes::_fstore_0: store_one(current, 0); break;
255 case Bytecodes::_fstore_1: store_one(current, 1); break;
256 case Bytecodes::_fstore_2: store_one(current, 2); break;
257 case Bytecodes::_fstore_3: store_one(current, 3); break;
258 case Bytecodes::_dstore_0: store_two(current, 0); break;
259 case Bytecodes::_dstore_1: store_two(current, 1); break;
260 case Bytecodes::_dstore_2: store_two(current, 2); break;
261 case Bytecodes::_dstore_3: store_two(current, 3); break;
262 case Bytecodes::_astore_0: store_one(current, 0); break;
263 case Bytecodes::_astore_1: store_one(current, 1); break;
264 case Bytecodes::_astore_2: store_one(current, 2); break;
265 case Bytecodes::_astore_3: store_one(current, 3); break;
267 // track bytecodes that affect the control flow
268 case Bytecodes::_athrow: // fall through
269 case Bytecodes::_ret: // fall through
270 case Bytecodes::_ireturn: // fall through
271 case Bytecodes::_lreturn: // fall through
272 case Bytecodes::_freturn: // fall through
273 case Bytecodes::_dreturn: // fall through
274 case Bytecodes::_areturn: // fall through
275 case Bytecodes::_return:
276 current = NULL;
277 break;
279 case Bytecodes::_ifeq: // fall through
280 case Bytecodes::_ifne: // fall through
281 case Bytecodes::_iflt: // fall through
282 case Bytecodes::_ifge: // fall through
283 case Bytecodes::_ifgt: // fall through
284 case Bytecodes::_ifle: // fall through
285 case Bytecodes::_if_icmpeq: // fall through
286 case Bytecodes::_if_icmpne: // fall through
287 case Bytecodes::_if_icmplt: // fall through
288 case Bytecodes::_if_icmpge: // fall through
289 case Bytecodes::_if_icmpgt: // fall through
290 case Bytecodes::_if_icmple: // fall through
291 case Bytecodes::_if_acmpeq: // fall through
292 case Bytecodes::_if_acmpne: // fall through
293 case Bytecodes::_ifnull: // fall through
294 case Bytecodes::_ifnonnull:
295 make_block_at(s.next_bci(), current);
296 make_block_at(s.get_dest(), current);
297 current = NULL;
298 break;
300 case Bytecodes::_goto:
301 make_block_at(s.get_dest(), current);
302 current = NULL;
303 break;
305 case Bytecodes::_goto_w:
306 make_block_at(s.get_far_dest(), current);
307 current = NULL;
308 break;
310 case Bytecodes::_jsr:
311 handle_jsr(current, s.get_dest(), s.next_bci());
312 current = NULL;
313 break;
315 case Bytecodes::_jsr_w:
316 handle_jsr(current, s.get_far_dest(), s.next_bci());
317 current = NULL;
318 break;
320 case Bytecodes::_tableswitch: {
321 // set block for each case
322 Bytecode_tableswitch sw(&s);
323 int l = sw.length();
324 for (int i = 0; i < l; i++) {
325 make_block_at(cur_bci + sw.dest_offset_at(i), current);
326 }
327 make_block_at(cur_bci + sw.default_offset(), current);
328 current = NULL;
329 break;
330 }
332 case Bytecodes::_lookupswitch: {
333 // set block for each case
334 Bytecode_lookupswitch sw(&s);
335 int l = sw.number_of_pairs();
336 for (int i = 0; i < l; i++) {
337 make_block_at(cur_bci + sw.pair_at(i).offset(), current);
338 }
339 make_block_at(cur_bci + sw.default_offset(), current);
340 current = NULL;
341 break;
342 }
343 }
344 }
345 }
348 void BlockListBuilder::mark_loops() {
349 ResourceMark rm;
351 _active = BitMap(BlockBegin::number_of_blocks()); _active.clear();
352 _visited = BitMap(BlockBegin::number_of_blocks()); _visited.clear();
353 _loop_map = intArray(BlockBegin::number_of_blocks(), 0);
354 _next_loop_index = 0;
355 _next_block_number = _blocks.length();
357 // recursively iterate the control flow graph
358 mark_loops(_bci2block->at(0), false);
359 assert(_next_block_number >= 0, "invalid block numbers");
360 }
362 void BlockListBuilder::make_loop_header(BlockBegin* block) {
363 if (block->is_set(BlockBegin::exception_entry_flag)) {
364 // exception edges may look like loops but don't mark them as such
365 // since it screws up block ordering.
366 return;
367 }
368 if (!block->is_set(BlockBegin::parser_loop_header_flag)) {
369 block->set(BlockBegin::parser_loop_header_flag);
371 assert(_loop_map.at(block->block_id()) == 0, "must not be set yet");
372 assert(0 <= _next_loop_index && _next_loop_index < BitsPerInt, "_next_loop_index is used as a bit-index in integer");
373 _loop_map.at_put(block->block_id(), 1 << _next_loop_index);
374 if (_next_loop_index < 31) _next_loop_index++;
375 } else {
376 // block already marked as loop header
377 assert(is_power_of_2((unsigned int)_loop_map.at(block->block_id())), "exactly one bit must be set");
378 }
379 }
381 int BlockListBuilder::mark_loops(BlockBegin* block, bool in_subroutine) {
382 int block_id = block->block_id();
384 if (_visited.at(block_id)) {
385 if (_active.at(block_id)) {
386 // reached block via backward branch
387 make_loop_header(block);
388 }
389 // return cached loop information for this block
390 return _loop_map.at(block_id);
391 }
393 if (block->is_set(BlockBegin::subroutine_entry_flag)) {
394 in_subroutine = true;
395 }
397 // set active and visited bits before successors are processed
398 _visited.set_bit(block_id);
399 _active.set_bit(block_id);
401 intptr_t loop_state = 0;
402 for (int i = block->number_of_sux() - 1; i >= 0; i--) {
403 // recursively process all successors
404 loop_state |= mark_loops(block->sux_at(i), in_subroutine);
405 }
407 // clear active-bit after all successors are processed
408 _active.clear_bit(block_id);
410 // reverse-post-order numbering of all blocks
411 block->set_depth_first_number(_next_block_number);
412 _next_block_number--;
414 if (loop_state != 0 || in_subroutine ) {
415 // block is contained at least in one loop, so phi functions are necessary
416 // phi functions are also necessary for all locals stored in a subroutine
417 scope()->requires_phi_function().set_union(block->stores_to_locals());
418 }
420 if (block->is_set(BlockBegin::parser_loop_header_flag)) {
421 int header_loop_state = _loop_map.at(block_id);
422 assert(is_power_of_2((unsigned)header_loop_state), "exactly one bit must be set");
424 // If the highest bit is set (i.e. when integer value is negative), the method
425 // has 32 or more loops. This bit is never cleared because it is used for multiple loops
426 if (header_loop_state >= 0) {
427 clear_bits(loop_state, header_loop_state);
428 }
429 }
431 // cache and return loop information for this block
432 _loop_map.at_put(block_id, loop_state);
433 return loop_state;
434 }
437 #ifndef PRODUCT
439 int compare_depth_first(BlockBegin** a, BlockBegin** b) {
440 return (*a)->depth_first_number() - (*b)->depth_first_number();
441 }
443 void BlockListBuilder::print() {
444 tty->print("----- initial block list of BlockListBuilder for method ");
445 method()->print_short_name();
446 tty->cr();
448 // better readability if blocks are sorted in processing order
449 _blocks.sort(compare_depth_first);
451 for (int i = 0; i < _blocks.length(); i++) {
452 BlockBegin* cur = _blocks.at(i);
453 tty->print("%4d: B%-4d bci: %-4d preds: %-4d ", cur->depth_first_number(), cur->block_id(), cur->bci(), cur->total_preds());
455 tty->print(cur->is_set(BlockBegin::std_entry_flag) ? " std" : " ");
456 tty->print(cur->is_set(BlockBegin::osr_entry_flag) ? " osr" : " ");
457 tty->print(cur->is_set(BlockBegin::exception_entry_flag) ? " ex" : " ");
458 tty->print(cur->is_set(BlockBegin::subroutine_entry_flag) ? " sr" : " ");
459 tty->print(cur->is_set(BlockBegin::parser_loop_header_flag) ? " lh" : " ");
461 if (cur->number_of_sux() > 0) {
462 tty->print(" sux: ");
463 for (int j = 0; j < cur->number_of_sux(); j++) {
464 BlockBegin* sux = cur->sux_at(j);
465 tty->print("B%d ", sux->block_id());
466 }
467 }
468 tty->cr();
469 }
470 }
472 #endif
475 // A simple growable array of Values indexed by ciFields
476 class FieldBuffer: public CompilationResourceObj {
477 private:
478 GrowableArray<Value> _values;
480 public:
481 FieldBuffer() {}
483 void kill() {
484 _values.trunc_to(0);
485 }
487 Value at(ciField* field) {
488 assert(field->holder()->is_loaded(), "must be a loaded field");
489 int offset = field->offset();
490 if (offset < _values.length()) {
491 return _values.at(offset);
492 } else {
493 return NULL;
494 }
495 }
497 void at_put(ciField* field, Value value) {
498 assert(field->holder()->is_loaded(), "must be a loaded field");
499 int offset = field->offset();
500 _values.at_put_grow(offset, value, NULL);
501 }
503 };
506 // MemoryBuffer is fairly simple model of the current state of memory.
507 // It partitions memory into several pieces. The first piece is
508 // generic memory where little is known about the owner of the memory.
509 // This is conceptually represented by the tuple <O, F, V> which says
510 // that the field F of object O has value V. This is flattened so
511 // that F is represented by the offset of the field and the parallel
512 // arrays _objects and _values are used for O and V. Loads of O.F can
513 // simply use V. Newly allocated objects are kept in a separate list
514 // along with a parallel array for each object which represents the
515 // current value of its fields. Stores of the default value to fields
516 // which have never been stored to before are eliminated since they
517 // are redundant. Once newly allocated objects are stored into
518 // another object or they are passed out of the current compile they
519 // are treated like generic memory.
521 class MemoryBuffer: public CompilationResourceObj {
522 private:
523 FieldBuffer _values;
524 GrowableArray<Value> _objects;
525 GrowableArray<Value> _newobjects;
526 GrowableArray<FieldBuffer*> _fields;
528 public:
529 MemoryBuffer() {}
531 StoreField* store(StoreField* st) {
532 if (!EliminateFieldAccess) {
533 return st;
534 }
536 Value object = st->obj();
537 Value value = st->value();
538 ciField* field = st->field();
539 if (field->holder()->is_loaded()) {
540 int offset = field->offset();
541 int index = _newobjects.find(object);
542 if (index != -1) {
543 // newly allocated object with no other stores performed on this field
544 FieldBuffer* buf = _fields.at(index);
545 if (buf->at(field) == NULL && is_default_value(value)) {
546 #ifndef PRODUCT
547 if (PrintIRDuringConstruction && Verbose) {
548 tty->print_cr("Eliminated store for object %d:", index);
549 st->print_line();
550 }
551 #endif
552 return NULL;
553 } else {
554 buf->at_put(field, value);
555 }
556 } else {
557 _objects.at_put_grow(offset, object, NULL);
558 _values.at_put(field, value);
559 }
561 store_value(value);
562 } else {
563 // if we held onto field names we could alias based on names but
564 // we don't know what's being stored to so kill it all.
565 kill();
566 }
567 return st;
568 }
571 // return true if this value correspond to the default value of a field.
572 bool is_default_value(Value value) {
573 Constant* con = value->as_Constant();
574 if (con) {
575 switch (con->type()->tag()) {
576 case intTag: return con->type()->as_IntConstant()->value() == 0;
577 case longTag: return con->type()->as_LongConstant()->value() == 0;
578 case floatTag: return jint_cast(con->type()->as_FloatConstant()->value()) == 0;
579 case doubleTag: return jlong_cast(con->type()->as_DoubleConstant()->value()) == jlong_cast(0);
580 case objectTag: return con->type() == objectNull;
581 default: ShouldNotReachHere();
582 }
583 }
584 return false;
585 }
588 // return either the actual value of a load or the load itself
589 Value load(LoadField* load) {
590 if (!EliminateFieldAccess) {
591 return load;
592 }
594 if (RoundFPResults && UseSSE < 2 && load->type()->is_float_kind()) {
595 // can't skip load since value might get rounded as a side effect
596 return load;
597 }
599 ciField* field = load->field();
600 Value object = load->obj();
601 if (field->holder()->is_loaded() && !field->is_volatile()) {
602 int offset = field->offset();
603 Value result = NULL;
604 int index = _newobjects.find(object);
605 if (index != -1) {
606 result = _fields.at(index)->at(field);
607 } else if (_objects.at_grow(offset, NULL) == object) {
608 result = _values.at(field);
609 }
610 if (result != NULL) {
611 #ifndef PRODUCT
612 if (PrintIRDuringConstruction && Verbose) {
613 tty->print_cr("Eliminated load: ");
614 load->print_line();
615 }
616 #endif
617 assert(result->type()->tag() == load->type()->tag(), "wrong types");
618 return result;
619 }
620 }
621 return load;
622 }
624 // Record this newly allocated object
625 void new_instance(NewInstance* object) {
626 int index = _newobjects.length();
627 _newobjects.append(object);
628 if (_fields.at_grow(index, NULL) == NULL) {
629 _fields.at_put(index, new FieldBuffer());
630 } else {
631 _fields.at(index)->kill();
632 }
633 }
635 void store_value(Value value) {
636 int index = _newobjects.find(value);
637 if (index != -1) {
638 // stored a newly allocated object into another object.
639 // Assume we've lost track of it as separate slice of memory.
640 // We could do better by keeping track of whether individual
641 // fields could alias each other.
642 _newobjects.remove_at(index);
643 // pull out the field info and store it at the end up the list
644 // of field info list to be reused later.
645 _fields.append(_fields.at(index));
646 _fields.remove_at(index);
647 }
648 }
650 void kill() {
651 _newobjects.trunc_to(0);
652 _objects.trunc_to(0);
653 _values.kill();
654 }
655 };
658 // Implementation of GraphBuilder's ScopeData
660 GraphBuilder::ScopeData::ScopeData(ScopeData* parent)
661 : _parent(parent)
662 , _bci2block(NULL)
663 , _scope(NULL)
664 , _has_handler(false)
665 , _stream(NULL)
666 , _work_list(NULL)
667 , _parsing_jsr(false)
668 , _jsr_xhandlers(NULL)
669 , _caller_stack_size(-1)
670 , _continuation(NULL)
671 , _num_returns(0)
672 , _cleanup_block(NULL)
673 , _cleanup_return_prev(NULL)
674 , _cleanup_state(NULL)
675 {
676 if (parent != NULL) {
677 _max_inline_size = (intx) ((float) NestedInliningSizeRatio * (float) parent->max_inline_size() / 100.0f);
678 } else {
679 _max_inline_size = MaxInlineSize;
680 }
681 if (_max_inline_size < MaxTrivialSize) {
682 _max_inline_size = MaxTrivialSize;
683 }
684 }
687 void GraphBuilder::kill_all() {
688 if (UseLocalValueNumbering) {
689 vmap()->kill_all();
690 }
691 _memory->kill();
692 }
695 BlockBegin* GraphBuilder::ScopeData::block_at(int bci) {
696 if (parsing_jsr()) {
697 // It is necessary to clone all blocks associated with a
698 // subroutine, including those for exception handlers in the scope
699 // of the method containing the jsr (because those exception
700 // handlers may contain ret instructions in some cases).
701 BlockBegin* block = bci2block()->at(bci);
702 if (block != NULL && block == parent()->bci2block()->at(bci)) {
703 BlockBegin* new_block = new BlockBegin(block->bci());
704 #ifndef PRODUCT
705 if (PrintInitialBlockList) {
706 tty->print_cr("CFG: cloned block %d (bci %d) as block %d for jsr",
707 block->block_id(), block->bci(), new_block->block_id());
708 }
709 #endif
710 // copy data from cloned blocked
711 new_block->set_depth_first_number(block->depth_first_number());
712 if (block->is_set(BlockBegin::parser_loop_header_flag)) new_block->set(BlockBegin::parser_loop_header_flag);
713 // Preserve certain flags for assertion checking
714 if (block->is_set(BlockBegin::subroutine_entry_flag)) new_block->set(BlockBegin::subroutine_entry_flag);
715 if (block->is_set(BlockBegin::exception_entry_flag)) new_block->set(BlockBegin::exception_entry_flag);
717 // copy was_visited_flag to allow early detection of bailouts
718 // if a block that is used in a jsr has already been visited before,
719 // it is shared between the normal control flow and a subroutine
720 // BlockBegin::try_merge returns false when the flag is set, this leads
721 // to a compilation bailout
722 if (block->is_set(BlockBegin::was_visited_flag)) new_block->set(BlockBegin::was_visited_flag);
724 bci2block()->at_put(bci, new_block);
725 block = new_block;
726 }
727 return block;
728 } else {
729 return bci2block()->at(bci);
730 }
731 }
734 XHandlers* GraphBuilder::ScopeData::xhandlers() const {
735 if (_jsr_xhandlers == NULL) {
736 assert(!parsing_jsr(), "");
737 return scope()->xhandlers();
738 }
739 assert(parsing_jsr(), "");
740 return _jsr_xhandlers;
741 }
744 void GraphBuilder::ScopeData::set_scope(IRScope* scope) {
745 _scope = scope;
746 bool parent_has_handler = false;
747 if (parent() != NULL) {
748 parent_has_handler = parent()->has_handler();
749 }
750 _has_handler = parent_has_handler || scope->xhandlers()->has_handlers();
751 }
754 void GraphBuilder::ScopeData::set_inline_cleanup_info(BlockBegin* block,
755 Instruction* return_prev,
756 ValueStack* return_state) {
757 _cleanup_block = block;
758 _cleanup_return_prev = return_prev;
759 _cleanup_state = return_state;
760 }
763 void GraphBuilder::ScopeData::add_to_work_list(BlockBegin* block) {
764 if (_work_list == NULL) {
765 _work_list = new BlockList();
766 }
768 if (!block->is_set(BlockBegin::is_on_work_list_flag)) {
769 // Do not start parsing the continuation block while in a
770 // sub-scope
771 if (parsing_jsr()) {
772 if (block == jsr_continuation()) {
773 return;
774 }
775 } else {
776 if (block == continuation()) {
777 return;
778 }
779 }
780 block->set(BlockBegin::is_on_work_list_flag);
781 _work_list->push(block);
783 sort_top_into_worklist(_work_list, block);
784 }
785 }
788 void GraphBuilder::sort_top_into_worklist(BlockList* worklist, BlockBegin* top) {
789 assert(worklist->top() == top, "");
790 // sort block descending into work list
791 const int dfn = top->depth_first_number();
792 assert(dfn != -1, "unknown depth first number");
793 int i = worklist->length()-2;
794 while (i >= 0) {
795 BlockBegin* b = worklist->at(i);
796 if (b->depth_first_number() < dfn) {
797 worklist->at_put(i+1, b);
798 } else {
799 break;
800 }
801 i --;
802 }
803 if (i >= -1) worklist->at_put(i + 1, top);
804 }
807 BlockBegin* GraphBuilder::ScopeData::remove_from_work_list() {
808 if (is_work_list_empty()) {
809 return NULL;
810 }
811 return _work_list->pop();
812 }
815 bool GraphBuilder::ScopeData::is_work_list_empty() const {
816 return (_work_list == NULL || _work_list->length() == 0);
817 }
820 void GraphBuilder::ScopeData::setup_jsr_xhandlers() {
821 assert(parsing_jsr(), "");
822 // clone all the exception handlers from the scope
823 XHandlers* handlers = new XHandlers(scope()->xhandlers());
824 const int n = handlers->length();
825 for (int i = 0; i < n; i++) {
826 // The XHandlers need to be adjusted to dispatch to the cloned
827 // handler block instead of the default one but the synthetic
828 // unlocker needs to be handled specially. The synthetic unlocker
829 // should be left alone since there can be only one and all code
830 // should dispatch to the same one.
831 XHandler* h = handlers->handler_at(i);
832 assert(h->handler_bci() != SynchronizationEntryBCI, "must be real");
833 h->set_entry_block(block_at(h->handler_bci()));
834 }
835 _jsr_xhandlers = handlers;
836 }
839 int GraphBuilder::ScopeData::num_returns() {
840 if (parsing_jsr()) {
841 return parent()->num_returns();
842 }
843 return _num_returns;
844 }
847 void GraphBuilder::ScopeData::incr_num_returns() {
848 if (parsing_jsr()) {
849 parent()->incr_num_returns();
850 } else {
851 ++_num_returns;
852 }
853 }
856 // Implementation of GraphBuilder
858 #define INLINE_BAILOUT(msg) { inline_bailout(msg); return false; }
861 void GraphBuilder::load_constant() {
862 ciConstant con = stream()->get_constant();
863 if (con.basic_type() == T_ILLEGAL) {
864 BAILOUT("could not resolve a constant");
865 } else {
866 ValueType* t = illegalType;
867 ValueStack* patch_state = NULL;
868 switch (con.basic_type()) {
869 case T_BOOLEAN: t = new IntConstant (con.as_boolean()); break;
870 case T_BYTE : t = new IntConstant (con.as_byte ()); break;
871 case T_CHAR : t = new IntConstant (con.as_char ()); break;
872 case T_SHORT : t = new IntConstant (con.as_short ()); break;
873 case T_INT : t = new IntConstant (con.as_int ()); break;
874 case T_LONG : t = new LongConstant (con.as_long ()); break;
875 case T_FLOAT : t = new FloatConstant (con.as_float ()); break;
876 case T_DOUBLE : t = new DoubleConstant (con.as_double ()); break;
877 case T_ARRAY : t = new ArrayConstant (con.as_object ()->as_array ()); break;
878 case T_OBJECT :
879 {
880 ciObject* obj = con.as_object();
881 if (!obj->is_loaded()
882 || (PatchALot && obj->klass() != ciEnv::current()->String_klass())) {
883 patch_state = copy_state_before();
884 t = new ObjectConstant(obj);
885 } else {
886 assert(!obj->is_klass(), "must be java_mirror of klass");
887 t = new InstanceConstant(obj->as_instance());
888 }
889 break;
890 }
891 default : ShouldNotReachHere();
892 }
893 Value x;
894 if (patch_state != NULL) {
895 x = new Constant(t, patch_state);
896 } else {
897 x = new Constant(t);
898 }
899 push(t, append(x));
900 }
901 }
904 void GraphBuilder::load_local(ValueType* type, int index) {
905 Value x = state()->local_at(index);
906 assert(x != NULL && !x->type()->is_illegal(), "access of illegal local variable");
907 push(type, x);
908 }
911 void GraphBuilder::store_local(ValueType* type, int index) {
912 Value x = pop(type);
913 store_local(state(), x, type, index);
914 }
917 void GraphBuilder::store_local(ValueStack* state, Value x, ValueType* type, int index) {
918 if (parsing_jsr()) {
919 // We need to do additional tracking of the location of the return
920 // address for jsrs since we don't handle arbitrary jsr/ret
921 // constructs. Here we are figuring out in which circumstances we
922 // need to bail out.
923 if (x->type()->is_address()) {
924 scope_data()->set_jsr_return_address_local(index);
926 // Also check parent jsrs (if any) at this time to see whether
927 // they are using this local. We don't handle skipping over a
928 // ret.
929 for (ScopeData* cur_scope_data = scope_data()->parent();
930 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
931 cur_scope_data = cur_scope_data->parent()) {
932 if (cur_scope_data->jsr_return_address_local() == index) {
933 BAILOUT("subroutine overwrites return address from previous subroutine");
934 }
935 }
936 } else if (index == scope_data()->jsr_return_address_local()) {
937 scope_data()->set_jsr_return_address_local(-1);
938 }
939 }
941 state->store_local(index, round_fp(x));
942 }
945 void GraphBuilder::load_indexed(BasicType type) {
946 ValueStack* state_before = copy_state_for_exception();
947 Value index = ipop();
948 Value array = apop();
949 Value length = NULL;
950 if (CSEArrayLength ||
951 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
952 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) {
953 length = append(new ArrayLength(array, state_before));
954 }
955 push(as_ValueType(type), append(new LoadIndexed(array, index, length, type, state_before)));
956 }
959 void GraphBuilder::store_indexed(BasicType type) {
960 ValueStack* state_before = copy_state_for_exception();
961 Value value = pop(as_ValueType(type));
962 Value index = ipop();
963 Value array = apop();
964 Value length = NULL;
965 if (CSEArrayLength ||
966 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
967 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) {
968 length = append(new ArrayLength(array, state_before));
969 }
970 StoreIndexed* result = new StoreIndexed(array, index, length, type, value, state_before);
971 append(result);
972 _memory->store_value(value);
974 if (type == T_OBJECT && is_profiling()) {
975 // Note that we'd collect profile data in this method if we wanted it.
976 compilation()->set_would_profile(true);
978 if (profile_checkcasts()) {
979 result->set_profiled_method(method());
980 result->set_profiled_bci(bci());
981 result->set_should_profile(true);
982 }
983 }
984 }
987 void GraphBuilder::stack_op(Bytecodes::Code code) {
988 switch (code) {
989 case Bytecodes::_pop:
990 { state()->raw_pop();
991 }
992 break;
993 case Bytecodes::_pop2:
994 { state()->raw_pop();
995 state()->raw_pop();
996 }
997 break;
998 case Bytecodes::_dup:
999 { Value w = state()->raw_pop();
1000 state()->raw_push(w);
1001 state()->raw_push(w);
1002 }
1003 break;
1004 case Bytecodes::_dup_x1:
1005 { Value w1 = state()->raw_pop();
1006 Value w2 = state()->raw_pop();
1007 state()->raw_push(w1);
1008 state()->raw_push(w2);
1009 state()->raw_push(w1);
1010 }
1011 break;
1012 case Bytecodes::_dup_x2:
1013 { Value w1 = state()->raw_pop();
1014 Value w2 = state()->raw_pop();
1015 Value w3 = state()->raw_pop();
1016 state()->raw_push(w1);
1017 state()->raw_push(w3);
1018 state()->raw_push(w2);
1019 state()->raw_push(w1);
1020 }
1021 break;
1022 case Bytecodes::_dup2:
1023 { Value w1 = state()->raw_pop();
1024 Value w2 = state()->raw_pop();
1025 state()->raw_push(w2);
1026 state()->raw_push(w1);
1027 state()->raw_push(w2);
1028 state()->raw_push(w1);
1029 }
1030 break;
1031 case Bytecodes::_dup2_x1:
1032 { Value w1 = state()->raw_pop();
1033 Value w2 = state()->raw_pop();
1034 Value w3 = state()->raw_pop();
1035 state()->raw_push(w2);
1036 state()->raw_push(w1);
1037 state()->raw_push(w3);
1038 state()->raw_push(w2);
1039 state()->raw_push(w1);
1040 }
1041 break;
1042 case Bytecodes::_dup2_x2:
1043 { Value w1 = state()->raw_pop();
1044 Value w2 = state()->raw_pop();
1045 Value w3 = state()->raw_pop();
1046 Value w4 = state()->raw_pop();
1047 state()->raw_push(w2);
1048 state()->raw_push(w1);
1049 state()->raw_push(w4);
1050 state()->raw_push(w3);
1051 state()->raw_push(w2);
1052 state()->raw_push(w1);
1053 }
1054 break;
1055 case Bytecodes::_swap:
1056 { Value w1 = state()->raw_pop();
1057 Value w2 = state()->raw_pop();
1058 state()->raw_push(w1);
1059 state()->raw_push(w2);
1060 }
1061 break;
1062 default:
1063 ShouldNotReachHere();
1064 break;
1065 }
1066 }
1069 void GraphBuilder::arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* state_before) {
1070 Value y = pop(type);
1071 Value x = pop(type);
1072 // NOTE: strictfp can be queried from current method since we don't
1073 // inline methods with differing strictfp bits
1074 Value res = new ArithmeticOp(code, x, y, method()->is_strict(), state_before);
1075 // Note: currently single-precision floating-point rounding on Intel is handled at the LIRGenerator level
1076 res = append(res);
1077 if (method()->is_strict()) {
1078 res = round_fp(res);
1079 }
1080 push(type, res);
1081 }
1084 void GraphBuilder::negate_op(ValueType* type) {
1085 push(type, append(new NegateOp(pop(type))));
1086 }
1089 void GraphBuilder::shift_op(ValueType* type, Bytecodes::Code code) {
1090 Value s = ipop();
1091 Value x = pop(type);
1092 // try to simplify
1093 // Note: This code should go into the canonicalizer as soon as it can
1094 // can handle canonicalized forms that contain more than one node.
1095 if (CanonicalizeNodes && code == Bytecodes::_iushr) {
1096 // pattern: x >>> s
1097 IntConstant* s1 = s->type()->as_IntConstant();
1098 if (s1 != NULL) {
1099 // pattern: x >>> s1, with s1 constant
1100 ShiftOp* l = x->as_ShiftOp();
1101 if (l != NULL && l->op() == Bytecodes::_ishl) {
1102 // pattern: (a << b) >>> s1
1103 IntConstant* s0 = l->y()->type()->as_IntConstant();
1104 if (s0 != NULL) {
1105 // pattern: (a << s0) >>> s1
1106 const int s0c = s0->value() & 0x1F; // only the low 5 bits are significant for shifts
1107 const int s1c = s1->value() & 0x1F; // only the low 5 bits are significant for shifts
1108 if (s0c == s1c) {
1109 if (s0c == 0) {
1110 // pattern: (a << 0) >>> 0 => simplify to: a
1111 ipush(l->x());
1112 } else {
1113 // pattern: (a << s0c) >>> s0c => simplify to: a & m, with m constant
1114 assert(0 < s0c && s0c < BitsPerInt, "adjust code below to handle corner cases");
1115 const int m = (1 << (BitsPerInt - s0c)) - 1;
1116 Value s = append(new Constant(new IntConstant(m)));
1117 ipush(append(new LogicOp(Bytecodes::_iand, l->x(), s)));
1118 }
1119 return;
1120 }
1121 }
1122 }
1123 }
1124 }
1125 // could not simplify
1126 push(type, append(new ShiftOp(code, x, s)));
1127 }
1130 void GraphBuilder::logic_op(ValueType* type, Bytecodes::Code code) {
1131 Value y = pop(type);
1132 Value x = pop(type);
1133 push(type, append(new LogicOp(code, x, y)));
1134 }
1137 void GraphBuilder::compare_op(ValueType* type, Bytecodes::Code code) {
1138 ValueStack* state_before = copy_state_before();
1139 Value y = pop(type);
1140 Value x = pop(type);
1141 ipush(append(new CompareOp(code, x, y, state_before)));
1142 }
1145 void GraphBuilder::convert(Bytecodes::Code op, BasicType from, BasicType to) {
1146 push(as_ValueType(to), append(new Convert(op, pop(as_ValueType(from)), as_ValueType(to))));
1147 }
1150 void GraphBuilder::increment() {
1151 int index = stream()->get_index();
1152 int delta = stream()->is_wide() ? (signed short)Bytes::get_Java_u2(stream()->cur_bcp() + 4) : (signed char)(stream()->cur_bcp()[2]);
1153 load_local(intType, index);
1154 ipush(append(new Constant(new IntConstant(delta))));
1155 arithmetic_op(intType, Bytecodes::_iadd);
1156 store_local(intType, index);
1157 }
1160 void GraphBuilder::_goto(int from_bci, int to_bci) {
1161 Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci);
1162 if (is_profiling()) {
1163 compilation()->set_would_profile(true);
1164 }
1165 if (profile_branches()) {
1166 x->set_profiled_method(method());
1167 x->set_profiled_bci(bci());
1168 x->set_should_profile(true);
1169 }
1170 append(x);
1171 }
1174 void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) {
1175 BlockBegin* tsux = block_at(stream()->get_dest());
1176 BlockBegin* fsux = block_at(stream()->next_bci());
1177 bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci();
1178 Instruction *i = append(new If(x, cond, false, y, tsux, fsux, is_bb ? state_before : NULL, is_bb));
1180 if (is_profiling()) {
1181 If* if_node = i->as_If();
1182 if (if_node != NULL) {
1183 // Note that we'd collect profile data in this method if we wanted it.
1184 compilation()->set_would_profile(true);
1185 // At level 2 we need the proper bci to count backedges
1186 if_node->set_profiled_bci(bci());
1187 if (profile_branches()) {
1188 // Successors can be rotated by the canonicalizer, check for this case.
1189 if_node->set_profiled_method(method());
1190 if_node->set_should_profile(true);
1191 if (if_node->tsux() == fsux) {
1192 if_node->set_swapped(true);
1193 }
1194 }
1195 return;
1196 }
1198 // Check if this If was reduced to Goto.
1199 Goto *goto_node = i->as_Goto();
1200 if (goto_node != NULL) {
1201 compilation()->set_would_profile(true);
1202 if (profile_branches()) {
1203 goto_node->set_profiled_method(method());
1204 goto_node->set_profiled_bci(bci());
1205 goto_node->set_should_profile(true);
1206 // Find out which successor is used.
1207 if (goto_node->default_sux() == tsux) {
1208 goto_node->set_direction(Goto::taken);
1209 } else if (goto_node->default_sux() == fsux) {
1210 goto_node->set_direction(Goto::not_taken);
1211 } else {
1212 ShouldNotReachHere();
1213 }
1214 }
1215 return;
1216 }
1217 }
1218 }
1221 void GraphBuilder::if_zero(ValueType* type, If::Condition cond) {
1222 Value y = append(new Constant(intZero));
1223 ValueStack* state_before = copy_state_before();
1224 Value x = ipop();
1225 if_node(x, cond, y, state_before);
1226 }
1229 void GraphBuilder::if_null(ValueType* type, If::Condition cond) {
1230 Value y = append(new Constant(objectNull));
1231 ValueStack* state_before = copy_state_before();
1232 Value x = apop();
1233 if_node(x, cond, y, state_before);
1234 }
1237 void GraphBuilder::if_same(ValueType* type, If::Condition cond) {
1238 ValueStack* state_before = copy_state_before();
1239 Value y = pop(type);
1240 Value x = pop(type);
1241 if_node(x, cond, y, state_before);
1242 }
1245 void GraphBuilder::jsr(int dest) {
1246 // We only handle well-formed jsrs (those which are "block-structured").
1247 // If the bytecodes are strange (jumping out of a jsr block) then we
1248 // might end up trying to re-parse a block containing a jsr which
1249 // has already been activated. Watch for this case and bail out.
1250 for (ScopeData* cur_scope_data = scope_data();
1251 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
1252 cur_scope_data = cur_scope_data->parent()) {
1253 if (cur_scope_data->jsr_entry_bci() == dest) {
1254 BAILOUT("too-complicated jsr/ret structure");
1255 }
1256 }
1258 push(addressType, append(new Constant(new AddressConstant(next_bci()))));
1259 if (!try_inline_jsr(dest)) {
1260 return; // bailed out while parsing and inlining subroutine
1261 }
1262 }
1265 void GraphBuilder::ret(int local_index) {
1266 if (!parsing_jsr()) BAILOUT("ret encountered while not parsing subroutine");
1268 if (local_index != scope_data()->jsr_return_address_local()) {
1269 BAILOUT("can not handle complicated jsr/ret constructs");
1270 }
1272 // Rets simply become (NON-SAFEPOINT) gotos to the jsr continuation
1273 append(new Goto(scope_data()->jsr_continuation(), false));
1274 }
1277 void GraphBuilder::table_switch() {
1278 Bytecode_tableswitch sw(stream());
1279 const int l = sw.length();
1280 if (CanonicalizeNodes && l == 1) {
1281 // total of 2 successors => use If instead of switch
1282 // Note: This code should go into the canonicalizer as soon as it can
1283 // can handle canonicalized forms that contain more than one node.
1284 Value key = append(new Constant(new IntConstant(sw.low_key())));
1285 BlockBegin* tsux = block_at(bci() + sw.dest_offset_at(0));
1286 BlockBegin* fsux = block_at(bci() + sw.default_offset());
1287 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
1288 ValueStack* state_before = is_bb ? copy_state_before() : NULL;
1289 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
1290 } else {
1291 // collect successors
1292 BlockList* sux = new BlockList(l + 1, NULL);
1293 int i;
1294 bool has_bb = false;
1295 for (i = 0; i < l; i++) {
1296 sux->at_put(i, block_at(bci() + sw.dest_offset_at(i)));
1297 if (sw.dest_offset_at(i) < 0) has_bb = true;
1298 }
1299 // add default successor
1300 sux->at_put(i, block_at(bci() + sw.default_offset()));
1301 ValueStack* state_before = has_bb ? copy_state_before() : NULL;
1302 append(new TableSwitch(ipop(), sux, sw.low_key(), state_before, has_bb));
1303 }
1304 }
1307 void GraphBuilder::lookup_switch() {
1308 Bytecode_lookupswitch sw(stream());
1309 const int l = sw.number_of_pairs();
1310 if (CanonicalizeNodes && l == 1) {
1311 // total of 2 successors => use If instead of switch
1312 // Note: This code should go into the canonicalizer as soon as it can
1313 // can handle canonicalized forms that contain more than one node.
1314 // simplify to If
1315 LookupswitchPair pair = sw.pair_at(0);
1316 Value key = append(new Constant(new IntConstant(pair.match())));
1317 BlockBegin* tsux = block_at(bci() + pair.offset());
1318 BlockBegin* fsux = block_at(bci() + sw.default_offset());
1319 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
1320 ValueStack* state_before = is_bb ? copy_state_before() : NULL;
1321 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
1322 } else {
1323 // collect successors & keys
1324 BlockList* sux = new BlockList(l + 1, NULL);
1325 intArray* keys = new intArray(l, 0);
1326 int i;
1327 bool has_bb = false;
1328 for (i = 0; i < l; i++) {
1329 LookupswitchPair pair = sw.pair_at(i);
1330 if (pair.offset() < 0) has_bb = true;
1331 sux->at_put(i, block_at(bci() + pair.offset()));
1332 keys->at_put(i, pair.match());
1333 }
1334 // add default successor
1335 sux->at_put(i, block_at(bci() + sw.default_offset()));
1336 ValueStack* state_before = has_bb ? copy_state_before() : NULL;
1337 append(new LookupSwitch(ipop(), sux, keys, state_before, has_bb));
1338 }
1339 }
1341 void GraphBuilder::call_register_finalizer() {
1342 // If the receiver requires finalization then emit code to perform
1343 // the registration on return.
1345 // Gather some type information about the receiver
1346 Value receiver = state()->local_at(0);
1347 assert(receiver != NULL, "must have a receiver");
1348 ciType* declared_type = receiver->declared_type();
1349 ciType* exact_type = receiver->exact_type();
1350 if (exact_type == NULL &&
1351 receiver->as_Local() &&
1352 receiver->as_Local()->java_index() == 0) {
1353 ciInstanceKlass* ik = compilation()->method()->holder();
1354 if (ik->is_final()) {
1355 exact_type = ik;
1356 } else if (UseCHA && !(ik->has_subklass() || ik->is_interface())) {
1357 // test class is leaf class
1358 compilation()->dependency_recorder()->assert_leaf_type(ik);
1359 exact_type = ik;
1360 } else {
1361 declared_type = ik;
1362 }
1363 }
1365 // see if we know statically that registration isn't required
1366 bool needs_check = true;
1367 if (exact_type != NULL) {
1368 needs_check = exact_type->as_instance_klass()->has_finalizer();
1369 } else if (declared_type != NULL) {
1370 ciInstanceKlass* ik = declared_type->as_instance_klass();
1371 if (!Dependencies::has_finalizable_subclass(ik)) {
1372 compilation()->dependency_recorder()->assert_has_no_finalizable_subclasses(ik);
1373 needs_check = false;
1374 }
1375 }
1377 if (needs_check) {
1378 // Perform the registration of finalizable objects.
1379 ValueStack* state_before = copy_state_for_exception();
1380 load_local(objectType, 0);
1381 append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init,
1382 state()->pop_arguments(1),
1383 true, state_before, true));
1384 }
1385 }
1388 void GraphBuilder::method_return(Value x) {
1389 if (RegisterFinalizersAtInit &&
1390 method()->intrinsic_id() == vmIntrinsics::_Object_init) {
1391 call_register_finalizer();
1392 }
1394 // Check to see whether we are inlining. If so, Return
1395 // instructions become Gotos to the continuation point.
1396 if (continuation() != NULL) {
1397 assert(!method()->is_synchronized() || InlineSynchronizedMethods, "can not inline synchronized methods yet");
1399 if (compilation()->env()->dtrace_method_probes()) {
1400 // Report exit from inline methods
1401 Values* args = new Values(1);
1402 args->push(append(new Constant(new ObjectConstant(method()))));
1403 append(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args));
1404 }
1406 // If the inlined method is synchronized, the monitor must be
1407 // released before we jump to the continuation block.
1408 if (method()->is_synchronized()) {
1409 assert(state()->locks_size() == 1, "receiver must be locked here");
1410 monitorexit(state()->lock_at(0), SynchronizationEntryBCI);
1411 }
1413 // State at end of inlined method is the state of the caller
1414 // without the method parameters on stack, including the
1415 // return value, if any, of the inlined method on operand stack.
1416 set_state(state()->caller_state()->copy_for_parsing());
1417 if (x != NULL) {
1418 state()->push(x->type(), x);
1419 }
1420 Goto* goto_callee = new Goto(continuation(), false);
1422 // See whether this is the first return; if so, store off some
1423 // of the state for later examination
1424 if (num_returns() == 0) {
1425 set_inline_cleanup_info(_block, _last, state());
1426 }
1428 // The current bci() is in the wrong scope, so use the bci() of
1429 // the continuation point.
1430 append_with_bci(goto_callee, scope_data()->continuation()->bci());
1431 incr_num_returns();
1433 return;
1434 }
1436 state()->truncate_stack(0);
1437 if (method()->is_synchronized()) {
1438 // perform the unlocking before exiting the method
1439 Value receiver;
1440 if (!method()->is_static()) {
1441 receiver = _initial_state->local_at(0);
1442 } else {
1443 receiver = append(new Constant(new ClassConstant(method()->holder())));
1444 }
1445 append_split(new MonitorExit(receiver, state()->unlock()));
1446 }
1448 append(new Return(x));
1449 }
1452 void GraphBuilder::access_field(Bytecodes::Code code) {
1453 bool will_link;
1454 ciField* field = stream()->get_field(will_link);
1455 ciInstanceKlass* holder = field->holder();
1456 BasicType field_type = field->type()->basic_type();
1457 ValueType* type = as_ValueType(field_type);
1458 // call will_link again to determine if the field is valid.
1459 const bool is_loaded = holder->is_loaded() &&
1460 field->will_link(method()->holder(), code);
1461 const bool is_initialized = is_loaded && holder->is_initialized();
1463 ValueStack* state_before = NULL;
1464 if (!is_initialized || PatchALot) {
1465 // save state before instruction for debug info when
1466 // deoptimization happens during patching
1467 state_before = copy_state_before();
1468 }
1470 Value obj = NULL;
1471 if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) {
1472 // commoning of class constants should only occur if the class is
1473 // fully initialized and resolved in this constant pool. The will_link test
1474 // above essentially checks if this class is resolved in this constant pool
1475 // so, the is_initialized flag should be suffiect.
1476 if (state_before != NULL) {
1477 // build a patching constant
1478 obj = new Constant(new ClassConstant(holder), state_before);
1479 } else {
1480 obj = new Constant(new ClassConstant(holder));
1481 }
1482 }
1485 const int offset = is_loaded ? field->offset() : -1;
1486 switch (code) {
1487 case Bytecodes::_getstatic: {
1488 // check for compile-time constants, i.e., initialized static final fields
1489 Instruction* constant = NULL;
1490 if (field->is_constant() && !PatchALot) {
1491 ciConstant field_val = field->constant_value();
1492 BasicType field_type = field_val.basic_type();
1493 switch (field_type) {
1494 case T_ARRAY:
1495 case T_OBJECT:
1496 if (field_val.as_object()->should_be_constant()) {
1497 constant = new Constant(as_ValueType(field_val));
1498 }
1499 break;
1501 default:
1502 constant = new Constant(as_ValueType(field_val));
1503 }
1504 }
1505 if (constant != NULL) {
1506 push(type, append(constant));
1507 } else {
1508 if (state_before == NULL) {
1509 state_before = copy_state_for_exception();
1510 }
1511 push(type, append(new LoadField(append(obj), offset, field, true,
1512 state_before, is_loaded, is_initialized)));
1513 }
1514 break;
1515 }
1516 case Bytecodes::_putstatic:
1517 { Value val = pop(type);
1518 if (state_before == NULL) {
1519 state_before = copy_state_for_exception();
1520 }
1521 append(new StoreField(append(obj), offset, field, val, true, state_before, is_loaded, is_initialized));
1522 }
1523 break;
1524 case Bytecodes::_getfield :
1525 {
1526 if (state_before == NULL) {
1527 state_before = copy_state_for_exception();
1528 }
1529 LoadField* load = new LoadField(apop(), offset, field, false, state_before, is_loaded, true);
1530 Value replacement = is_loaded ? _memory->load(load) : load;
1531 if (replacement != load) {
1532 assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked");
1533 push(type, replacement);
1534 } else {
1535 push(type, append(load));
1536 }
1537 break;
1538 }
1540 case Bytecodes::_putfield :
1541 { Value val = pop(type);
1542 if (state_before == NULL) {
1543 state_before = copy_state_for_exception();
1544 }
1545 StoreField* store = new StoreField(apop(), offset, field, val, false, state_before, is_loaded, true);
1546 if (is_loaded) store = _memory->store(store);
1547 if (store != NULL) {
1548 append(store);
1549 }
1550 }
1551 break;
1552 default :
1553 ShouldNotReachHere();
1554 break;
1555 }
1556 }
1559 Dependencies* GraphBuilder::dependency_recorder() const {
1560 assert(DeoptC1, "need debug information");
1561 return compilation()->dependency_recorder();
1562 }
1565 void GraphBuilder::invoke(Bytecodes::Code code) {
1566 bool will_link;
1567 ciMethod* target = stream()->get_method(will_link);
1568 // we have to make sure the argument size (incl. the receiver)
1569 // is correct for compilation (the call would fail later during
1570 // linkage anyway) - was bug (gri 7/28/99)
1571 if (target->is_loaded() && target->is_static() != (code == Bytecodes::_invokestatic)) BAILOUT("will cause link error");
1572 ciInstanceKlass* klass = target->holder();
1574 // check if CHA possible: if so, change the code to invoke_special
1575 ciInstanceKlass* calling_klass = method()->holder();
1576 ciKlass* holder = stream()->get_declared_method_holder();
1577 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder);
1578 ciInstanceKlass* actual_recv = callee_holder;
1580 // some methods are obviously bindable without any type checks so
1581 // convert them directly to an invokespecial.
1582 if (target->is_loaded() && !target->is_abstract() &&
1583 target->can_be_statically_bound() && code == Bytecodes::_invokevirtual) {
1584 code = Bytecodes::_invokespecial;
1585 }
1587 // NEEDS_CLEANUP
1588 // I've added the target-is_loaded() test below but I don't really understand
1589 // how klass->is_loaded() can be true and yet target->is_loaded() is false.
1590 // this happened while running the JCK invokevirtual tests under doit. TKR
1591 ciMethod* cha_monomorphic_target = NULL;
1592 ciMethod* exact_target = NULL;
1593 if (UseCHA && DeoptC1 && klass->is_loaded() && target->is_loaded() &&
1594 !target->is_method_handle_invoke()) {
1595 Value receiver = NULL;
1596 ciInstanceKlass* receiver_klass = NULL;
1597 bool type_is_exact = false;
1598 // try to find a precise receiver type
1599 if (will_link && !target->is_static()) {
1600 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
1601 receiver = state()->stack_at(index);
1602 ciType* type = receiver->exact_type();
1603 if (type != NULL && type->is_loaded() &&
1604 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
1605 receiver_klass = (ciInstanceKlass*) type;
1606 type_is_exact = true;
1607 }
1608 if (type == NULL) {
1609 type = receiver->declared_type();
1610 if (type != NULL && type->is_loaded() &&
1611 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
1612 receiver_klass = (ciInstanceKlass*) type;
1613 if (receiver_klass->is_leaf_type() && !receiver_klass->is_final()) {
1614 // Insert a dependency on this type since
1615 // find_monomorphic_target may assume it's already done.
1616 dependency_recorder()->assert_leaf_type(receiver_klass);
1617 type_is_exact = true;
1618 }
1619 }
1620 }
1621 }
1622 if (receiver_klass != NULL && type_is_exact &&
1623 receiver_klass->is_loaded() && code != Bytecodes::_invokespecial) {
1624 // If we have the exact receiver type we can bind directly to
1625 // the method to call.
1626 exact_target = target->resolve_invoke(calling_klass, receiver_klass);
1627 if (exact_target != NULL) {
1628 target = exact_target;
1629 code = Bytecodes::_invokespecial;
1630 }
1631 }
1632 if (receiver_klass != NULL &&
1633 receiver_klass->is_subtype_of(actual_recv) &&
1634 actual_recv->is_initialized()) {
1635 actual_recv = receiver_klass;
1636 }
1638 if ((code == Bytecodes::_invokevirtual && callee_holder->is_initialized()) ||
1639 (code == Bytecodes::_invokeinterface && callee_holder->is_initialized() && !actual_recv->is_interface())) {
1640 // Use CHA on the receiver to select a more precise method.
1641 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv);
1642 } else if (code == Bytecodes::_invokeinterface && callee_holder->is_loaded() && receiver != NULL) {
1643 // if there is only one implementor of this interface then we
1644 // may be able bind this invoke directly to the implementing
1645 // klass but we need both a dependence on the single interface
1646 // and on the method we bind to. Additionally since all we know
1647 // about the receiver type is the it's supposed to implement the
1648 // interface we have to insert a check that it's the class we
1649 // expect. Interface types are not checked by the verifier so
1650 // they are roughly equivalent to Object.
1651 ciInstanceKlass* singleton = NULL;
1652 if (target->holder()->nof_implementors() == 1) {
1653 singleton = target->holder()->implementor(0);
1654 }
1655 if (singleton) {
1656 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, target->holder(), singleton);
1657 if (cha_monomorphic_target != NULL) {
1658 // If CHA is able to bind this invoke then update the class
1659 // to match that class, otherwise klass will refer to the
1660 // interface.
1661 klass = cha_monomorphic_target->holder();
1662 actual_recv = target->holder();
1664 // insert a check it's really the expected class.
1665 CheckCast* c = new CheckCast(klass, receiver, copy_state_for_exception());
1666 c->set_incompatible_class_change_check();
1667 c->set_direct_compare(klass->is_final());
1668 append_split(c);
1669 }
1670 }
1671 }
1672 }
1674 if (cha_monomorphic_target != NULL) {
1675 if (cha_monomorphic_target->is_abstract()) {
1676 // Do not optimize for abstract methods
1677 cha_monomorphic_target = NULL;
1678 }
1679 }
1681 if (cha_monomorphic_target != NULL) {
1682 if (!(target->is_final_method())) {
1683 // If we inlined because CHA revealed only a single target method,
1684 // then we are dependent on that target method not getting overridden
1685 // by dynamic class loading. Be sure to test the "static" receiver
1686 // dest_method here, as opposed to the actual receiver, which may
1687 // falsely lead us to believe that the receiver is final or private.
1688 dependency_recorder()->assert_unique_concrete_method(actual_recv, cha_monomorphic_target);
1689 }
1690 code = Bytecodes::_invokespecial;
1691 }
1692 // check if we could do inlining
1693 if (!PatchALot && Inline && klass->is_loaded() &&
1694 (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized())
1695 && target->will_link(klass, callee_holder, code)) {
1696 // callee is known => check if we have static binding
1697 assert(target->is_loaded(), "callee must be known");
1698 if (code == Bytecodes::_invokestatic
1699 || code == Bytecodes::_invokespecial
1700 || code == Bytecodes::_invokevirtual && target->is_final_method()
1701 ) {
1702 // static binding => check if callee is ok
1703 ciMethod* inline_target = (cha_monomorphic_target != NULL)
1704 ? cha_monomorphic_target
1705 : target;
1706 bool res = try_inline(inline_target, (cha_monomorphic_target != NULL) || (exact_target != NULL));
1707 CHECK_BAILOUT();
1709 #ifndef PRODUCT
1710 // printing
1711 if (PrintInlining && !res) {
1712 // if it was successfully inlined, then it was already printed.
1713 print_inline_result(inline_target, res);
1714 }
1715 #endif
1716 clear_inline_bailout();
1717 if (res) {
1718 // Register dependence if JVMTI has either breakpoint
1719 // setting or hotswapping of methods capabilities since they may
1720 // cause deoptimization.
1721 if (compilation()->env()->jvmti_can_hotswap_or_post_breakpoint()) {
1722 dependency_recorder()->assert_evol_method(inline_target);
1723 }
1724 return;
1725 }
1726 }
1727 }
1728 // If we attempted an inline which did not succeed because of a
1729 // bailout during construction of the callee graph, the entire
1730 // compilation has to be aborted. This is fairly rare and currently
1731 // seems to only occur for jasm-generated classes which contain
1732 // jsr/ret pairs which are not associated with finally clauses and
1733 // do not have exception handlers in the containing method, and are
1734 // therefore not caught early enough to abort the inlining without
1735 // corrupting the graph. (We currently bail out with a non-empty
1736 // stack at a ret in these situations.)
1737 CHECK_BAILOUT();
1739 // inlining not successful => standard invoke
1740 bool is_loaded = target->is_loaded();
1741 bool has_receiver =
1742 code == Bytecodes::_invokespecial ||
1743 code == Bytecodes::_invokevirtual ||
1744 code == Bytecodes::_invokeinterface;
1745 bool is_invokedynamic = code == Bytecodes::_invokedynamic;
1746 ValueType* result_type = as_ValueType(target->return_type());
1748 // We require the debug info to be the "state before" because
1749 // invokedynamics may deoptimize.
1750 ValueStack* state_before = is_invokedynamic ? copy_state_before() : copy_state_exhandling();
1752 Values* args = state()->pop_arguments(target->arg_size_no_receiver());
1753 Value recv = has_receiver ? apop() : NULL;
1754 int vtable_index = methodOopDesc::invalid_vtable_index;
1756 #ifdef SPARC
1757 // Currently only supported on Sparc.
1758 // The UseInlineCaches only controls dispatch to invokevirtuals for
1759 // loaded classes which we weren't able to statically bind.
1760 if (!UseInlineCaches && is_loaded && code == Bytecodes::_invokevirtual
1761 && !target->can_be_statically_bound()) {
1762 // Find a vtable index if one is available
1763 vtable_index = target->resolve_vtable_index(calling_klass, callee_holder);
1764 }
1765 #endif
1767 if (recv != NULL &&
1768 (code == Bytecodes::_invokespecial ||
1769 !is_loaded || target->is_final())) {
1770 // invokespecial always needs a NULL check. invokevirtual where
1771 // the target is final or where it's not known that whether the
1772 // target is final requires a NULL check. Otherwise normal
1773 // invokevirtual will perform the null check during the lookup
1774 // logic or the unverified entry point. Profiling of calls
1775 // requires that the null check is performed in all cases.
1776 null_check(recv);
1777 }
1779 if (is_profiling()) {
1780 if (recv != NULL && profile_calls()) {
1781 null_check(recv);
1782 }
1783 // Note that we'd collect profile data in this method if we wanted it.
1784 compilation()->set_would_profile(true);
1786 if (profile_calls()) {
1787 assert(cha_monomorphic_target == NULL || exact_target == NULL, "both can not be set");
1788 ciKlass* target_klass = NULL;
1789 if (cha_monomorphic_target != NULL) {
1790 target_klass = cha_monomorphic_target->holder();
1791 } else if (exact_target != NULL) {
1792 target_klass = exact_target->holder();
1793 }
1794 profile_call(recv, target_klass);
1795 }
1796 }
1798 Invoke* result = new Invoke(code, result_type, recv, args, vtable_index, target, state_before);
1799 // push result
1800 append_split(result);
1802 if (result_type != voidType) {
1803 if (method()->is_strict()) {
1804 push(result_type, round_fp(result));
1805 } else {
1806 push(result_type, result);
1807 }
1808 }
1809 }
1812 void GraphBuilder::new_instance(int klass_index) {
1813 ValueStack* state_before = copy_state_exhandling();
1814 bool will_link;
1815 ciKlass* klass = stream()->get_klass(will_link);
1816 assert(klass->is_instance_klass(), "must be an instance klass");
1817 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before);
1818 _memory->new_instance(new_instance);
1819 apush(append_split(new_instance));
1820 }
1823 void GraphBuilder::new_type_array() {
1824 ValueStack* state_before = copy_state_exhandling();
1825 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before)));
1826 }
1829 void GraphBuilder::new_object_array() {
1830 bool will_link;
1831 ciKlass* klass = stream()->get_klass(will_link);
1832 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
1833 NewArray* n = new NewObjectArray(klass, ipop(), state_before);
1834 apush(append_split(n));
1835 }
1838 bool GraphBuilder::direct_compare(ciKlass* k) {
1839 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) {
1840 ciInstanceKlass* ik = k->as_instance_klass();
1841 if (ik->is_final()) {
1842 return true;
1843 } else {
1844 if (DeoptC1 && UseCHA && !(ik->has_subklass() || ik->is_interface())) {
1845 // test class is leaf class
1846 dependency_recorder()->assert_leaf_type(ik);
1847 return true;
1848 }
1849 }
1850 }
1851 return false;
1852 }
1855 void GraphBuilder::check_cast(int klass_index) {
1856 bool will_link;
1857 ciKlass* klass = stream()->get_klass(will_link);
1858 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_for_exception();
1859 CheckCast* c = new CheckCast(klass, apop(), state_before);
1860 apush(append_split(c));
1861 c->set_direct_compare(direct_compare(klass));
1863 if (is_profiling()) {
1864 // Note that we'd collect profile data in this method if we wanted it.
1865 compilation()->set_would_profile(true);
1867 if (profile_checkcasts()) {
1868 c->set_profiled_method(method());
1869 c->set_profiled_bci(bci());
1870 c->set_should_profile(true);
1871 }
1872 }
1873 }
1876 void GraphBuilder::instance_of(int klass_index) {
1877 bool will_link;
1878 ciKlass* klass = stream()->get_klass(will_link);
1879 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
1880 InstanceOf* i = new InstanceOf(klass, apop(), state_before);
1881 ipush(append_split(i));
1882 i->set_direct_compare(direct_compare(klass));
1884 if (is_profiling()) {
1885 // Note that we'd collect profile data in this method if we wanted it.
1886 compilation()->set_would_profile(true);
1888 if (profile_checkcasts()) {
1889 i->set_profiled_method(method());
1890 i->set_profiled_bci(bci());
1891 i->set_should_profile(true);
1892 }
1893 }
1894 }
1897 void GraphBuilder::monitorenter(Value x, int bci) {
1898 // save state before locking in case of deoptimization after a NullPointerException
1899 ValueStack* state_before = copy_state_for_exception_with_bci(bci);
1900 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before), bci);
1901 kill_all();
1902 }
1905 void GraphBuilder::monitorexit(Value x, int bci) {
1906 append_with_bci(new MonitorExit(x, state()->unlock()), bci);
1907 kill_all();
1908 }
1911 void GraphBuilder::new_multi_array(int dimensions) {
1912 bool will_link;
1913 ciKlass* klass = stream()->get_klass(will_link);
1914 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
1916 Values* dims = new Values(dimensions, NULL);
1917 // fill in all dimensions
1918 int i = dimensions;
1919 while (i-- > 0) dims->at_put(i, ipop());
1920 // create array
1921 NewArray* n = new NewMultiArray(klass, dims, state_before);
1922 apush(append_split(n));
1923 }
1926 void GraphBuilder::throw_op(int bci) {
1927 // We require that the debug info for a Throw be the "state before"
1928 // the Throw (i.e., exception oop is still on TOS)
1929 ValueStack* state_before = copy_state_before_with_bci(bci);
1930 Throw* t = new Throw(apop(), state_before);
1931 // operand stack not needed after a throw
1932 state()->truncate_stack(0);
1933 append_with_bci(t, bci);
1934 }
1937 Value GraphBuilder::round_fp(Value fp_value) {
1938 // no rounding needed if SSE2 is used
1939 if (RoundFPResults && UseSSE < 2) {
1940 // Must currently insert rounding node for doubleword values that
1941 // are results of expressions (i.e., not loads from memory or
1942 // constants)
1943 if (fp_value->type()->tag() == doubleTag &&
1944 fp_value->as_Constant() == NULL &&
1945 fp_value->as_Local() == NULL && // method parameters need no rounding
1946 fp_value->as_RoundFP() == NULL) {
1947 return append(new RoundFP(fp_value));
1948 }
1949 }
1950 return fp_value;
1951 }
1954 Instruction* GraphBuilder::append_with_bci(Instruction* instr, int bci) {
1955 Canonicalizer canon(compilation(), instr, bci);
1956 Instruction* i1 = canon.canonical();
1957 if (i1->is_linked() || !i1->can_be_linked()) {
1958 // Canonicalizer returned an instruction which was already
1959 // appended so simply return it.
1960 return i1;
1961 }
1963 if (UseLocalValueNumbering) {
1964 // Lookup the instruction in the ValueMap and add it to the map if
1965 // it's not found.
1966 Instruction* i2 = vmap()->find_insert(i1);
1967 if (i2 != i1) {
1968 // found an entry in the value map, so just return it.
1969 assert(i2->is_linked(), "should already be linked");
1970 return i2;
1971 }
1972 ValueNumberingEffects vne(vmap());
1973 i1->visit(&vne);
1974 }
1976 // i1 was not eliminated => append it
1977 assert(i1->next() == NULL, "shouldn't already be linked");
1978 _last = _last->set_next(i1, canon.bci());
1980 if (++_instruction_count >= InstructionCountCutoff && !bailed_out()) {
1981 // set the bailout state but complete normal processing. We
1982 // might do a little more work before noticing the bailout so we
1983 // want processing to continue normally until it's noticed.
1984 bailout("Method and/or inlining is too large");
1985 }
1987 #ifndef PRODUCT
1988 if (PrintIRDuringConstruction) {
1989 InstructionPrinter ip;
1990 ip.print_line(i1);
1991 if (Verbose) {
1992 state()->print();
1993 }
1994 }
1995 #endif
1997 // save state after modification of operand stack for StateSplit instructions
1998 StateSplit* s = i1->as_StateSplit();
1999 if (s != NULL) {
2000 if (EliminateFieldAccess) {
2001 Intrinsic* intrinsic = s->as_Intrinsic();
2002 if (s->as_Invoke() != NULL || (intrinsic && !intrinsic->preserves_state())) {
2003 _memory->kill();
2004 }
2005 }
2006 s->set_state(state()->copy(ValueStack::StateAfter, canon.bci()));
2007 }
2009 // set up exception handlers for this instruction if necessary
2010 if (i1->can_trap()) {
2011 i1->set_exception_handlers(handle_exception(i1));
2012 assert(i1->exception_state() != NULL || !i1->needs_exception_state() || bailed_out(), "handle_exception must set exception state");
2013 }
2014 return i1;
2015 }
2018 Instruction* GraphBuilder::append(Instruction* instr) {
2019 assert(instr->as_StateSplit() == NULL || instr->as_BlockEnd() != NULL, "wrong append used");
2020 return append_with_bci(instr, bci());
2021 }
2024 Instruction* GraphBuilder::append_split(StateSplit* instr) {
2025 return append_with_bci(instr, bci());
2026 }
2029 void GraphBuilder::null_check(Value value) {
2030 if (value->as_NewArray() != NULL || value->as_NewInstance() != NULL) {
2031 return;
2032 } else {
2033 Constant* con = value->as_Constant();
2034 if (con) {
2035 ObjectType* c = con->type()->as_ObjectType();
2036 if (c && c->is_loaded()) {
2037 ObjectConstant* oc = c->as_ObjectConstant();
2038 if (!oc || !oc->value()->is_null_object()) {
2039 return;
2040 }
2041 }
2042 }
2043 }
2044 append(new NullCheck(value, copy_state_for_exception()));
2045 }
2049 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) {
2050 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != NULL)) {
2051 assert(instruction->exception_state() == NULL
2052 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState
2053 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->jvmti_can_access_local_variables()),
2054 "exception_state should be of exception kind");
2055 return new XHandlers();
2056 }
2058 XHandlers* exception_handlers = new XHandlers();
2059 ScopeData* cur_scope_data = scope_data();
2060 ValueStack* cur_state = instruction->state_before();
2061 ValueStack* prev_state = NULL;
2062 int scope_count = 0;
2064 assert(cur_state != NULL, "state_before must be set");
2065 do {
2066 int cur_bci = cur_state->bci();
2067 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2068 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci(), "invalid bci");
2070 // join with all potential exception handlers
2071 XHandlers* list = cur_scope_data->xhandlers();
2072 const int n = list->length();
2073 for (int i = 0; i < n; i++) {
2074 XHandler* h = list->handler_at(i);
2075 if (h->covers(cur_bci)) {
2076 // h is a potential exception handler => join it
2077 compilation()->set_has_exception_handlers(true);
2079 BlockBegin* entry = h->entry_block();
2080 if (entry == block()) {
2081 // It's acceptable for an exception handler to cover itself
2082 // but we don't handle that in the parser currently. It's
2083 // very rare so we bailout instead of trying to handle it.
2084 BAILOUT_("exception handler covers itself", exception_handlers);
2085 }
2086 assert(entry->bci() == h->handler_bci(), "must match");
2087 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond");
2089 // previously this was a BAILOUT, but this is not necessary
2090 // now because asynchronous exceptions are not handled this way.
2091 assert(entry->state() == NULL || cur_state->total_locks_size() == entry->state()->total_locks_size(), "locks do not match");
2093 // xhandler start with an empty expression stack
2094 if (cur_state->stack_size() != 0) {
2095 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
2096 }
2097 if (instruction->exception_state() == NULL) {
2098 instruction->set_exception_state(cur_state);
2099 }
2101 // Note: Usually this join must work. However, very
2102 // complicated jsr-ret structures where we don't ret from
2103 // the subroutine can cause the objects on the monitor
2104 // stacks to not match because blocks can be parsed twice.
2105 // The only test case we've seen so far which exhibits this
2106 // problem is caught by the infinite recursion test in
2107 // GraphBuilder::jsr() if the join doesn't work.
2108 if (!entry->try_merge(cur_state)) {
2109 BAILOUT_("error while joining with exception handler, prob. due to complicated jsr/rets", exception_handlers);
2110 }
2112 // add current state for correct handling of phi functions at begin of xhandler
2113 int phi_operand = entry->add_exception_state(cur_state);
2115 // add entry to the list of xhandlers of this block
2116 _block->add_exception_handler(entry);
2118 // add back-edge from xhandler entry to this block
2119 if (!entry->is_predecessor(_block)) {
2120 entry->add_predecessor(_block);
2121 }
2123 // clone XHandler because phi_operand and scope_count can not be shared
2124 XHandler* new_xhandler = new XHandler(h);
2125 new_xhandler->set_phi_operand(phi_operand);
2126 new_xhandler->set_scope_count(scope_count);
2127 exception_handlers->append(new_xhandler);
2129 // fill in exception handler subgraph lazily
2130 assert(!entry->is_set(BlockBegin::was_visited_flag), "entry must not be visited yet");
2131 cur_scope_data->add_to_work_list(entry);
2133 // stop when reaching catchall
2134 if (h->catch_type() == 0) {
2135 return exception_handlers;
2136 }
2137 }
2138 }
2140 if (exception_handlers->length() == 0) {
2141 // This scope and all callees do not handle exceptions, so the local
2142 // variables of this scope are not needed. However, the scope itself is
2143 // required for a correct exception stack trace -> clear out the locals.
2144 if (_compilation->env()->jvmti_can_access_local_variables()) {
2145 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
2146 } else {
2147 cur_state = cur_state->copy(ValueStack::EmptyExceptionState, cur_state->bci());
2148 }
2149 if (prev_state != NULL) {
2150 prev_state->set_caller_state(cur_state);
2151 }
2152 if (instruction->exception_state() == NULL) {
2153 instruction->set_exception_state(cur_state);
2154 }
2155 }
2157 // Set up iteration for next time.
2158 // If parsing a jsr, do not grab exception handlers from the
2159 // parent scopes for this method (already got them, and they
2160 // needed to be cloned)
2162 while (cur_scope_data->parsing_jsr()) {
2163 cur_scope_data = cur_scope_data->parent();
2164 }
2166 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2167 assert(cur_state->locks_size() == 0 || cur_state->locks_size() == 1, "unlocking must be done in a catchall exception handler");
2169 prev_state = cur_state;
2170 cur_state = cur_state->caller_state();
2171 cur_scope_data = cur_scope_data->parent();
2172 scope_count++;
2173 } while (cur_scope_data != NULL);
2175 return exception_handlers;
2176 }
2179 // Helper class for simplifying Phis.
2180 class PhiSimplifier : public BlockClosure {
2181 private:
2182 bool _has_substitutions;
2183 Value simplify(Value v);
2185 public:
2186 PhiSimplifier(BlockBegin* start) : _has_substitutions(false) {
2187 start->iterate_preorder(this);
2188 if (_has_substitutions) {
2189 SubstitutionResolver sr(start);
2190 }
2191 }
2192 void block_do(BlockBegin* b);
2193 bool has_substitutions() const { return _has_substitutions; }
2194 };
2197 Value PhiSimplifier::simplify(Value v) {
2198 Phi* phi = v->as_Phi();
2200 if (phi == NULL) {
2201 // no phi function
2202 return v;
2203 } else if (v->has_subst()) {
2204 // already substituted; subst can be phi itself -> simplify
2205 return simplify(v->subst());
2206 } else if (phi->is_set(Phi::cannot_simplify)) {
2207 // already tried to simplify phi before
2208 return phi;
2209 } else if (phi->is_set(Phi::visited)) {
2210 // break cycles in phi functions
2211 return phi;
2212 } else if (phi->type()->is_illegal()) {
2213 // illegal phi functions are ignored anyway
2214 return phi;
2216 } else {
2217 // mark phi function as processed to break cycles in phi functions
2218 phi->set(Phi::visited);
2220 // simplify x = [y, x] and x = [y, y] to y
2221 Value subst = NULL;
2222 int opd_count = phi->operand_count();
2223 for (int i = 0; i < opd_count; i++) {
2224 Value opd = phi->operand_at(i);
2225 assert(opd != NULL, "Operand must exist!");
2227 if (opd->type()->is_illegal()) {
2228 // if one operand is illegal, the entire phi function is illegal
2229 phi->make_illegal();
2230 phi->clear(Phi::visited);
2231 return phi;
2232 }
2234 Value new_opd = simplify(opd);
2235 assert(new_opd != NULL, "Simplified operand must exist!");
2237 if (new_opd != phi && new_opd != subst) {
2238 if (subst == NULL) {
2239 subst = new_opd;
2240 } else {
2241 // no simplification possible
2242 phi->set(Phi::cannot_simplify);
2243 phi->clear(Phi::visited);
2244 return phi;
2245 }
2246 }
2247 }
2249 // sucessfully simplified phi function
2250 assert(subst != NULL, "illegal phi function");
2251 _has_substitutions = true;
2252 phi->clear(Phi::visited);
2253 phi->set_subst(subst);
2255 #ifndef PRODUCT
2256 if (PrintPhiFunctions) {
2257 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());
2258 }
2259 #endif
2261 return subst;
2262 }
2263 }
2266 void PhiSimplifier::block_do(BlockBegin* b) {
2267 for_each_phi_fun(b, phi,
2268 simplify(phi);
2269 );
2271 #ifdef ASSERT
2272 for_each_phi_fun(b, phi,
2273 assert(phi->operand_count() != 1 || phi->subst() != phi, "missed trivial simplification");
2274 );
2276 ValueStack* state = b->state()->caller_state();
2277 for_each_state_value(state, value,
2278 Phi* phi = value->as_Phi();
2279 assert(phi == NULL || phi->block() != b, "must not have phi function to simplify in caller state");
2280 );
2281 #endif
2282 }
2284 // This method is called after all blocks are filled with HIR instructions
2285 // It eliminates all Phi functions of the form x = [y, y] and x = [y, x]
2286 void GraphBuilder::eliminate_redundant_phis(BlockBegin* start) {
2287 PhiSimplifier simplifier(start);
2288 }
2291 void GraphBuilder::connect_to_end(BlockBegin* beg) {
2292 // setup iteration
2293 kill_all();
2294 _block = beg;
2295 _state = beg->state()->copy_for_parsing();
2296 _last = beg;
2297 iterate_bytecodes_for_block(beg->bci());
2298 }
2301 BlockEnd* GraphBuilder::iterate_bytecodes_for_block(int bci) {
2302 #ifndef PRODUCT
2303 if (PrintIRDuringConstruction) {
2304 tty->cr();
2305 InstructionPrinter ip;
2306 ip.print_instr(_block); tty->cr();
2307 ip.print_stack(_block->state()); tty->cr();
2308 ip.print_inline_level(_block);
2309 ip.print_head();
2310 tty->print_cr("locals size: %d stack size: %d", state()->locals_size(), state()->stack_size());
2311 }
2312 #endif
2313 _skip_block = false;
2314 assert(state() != NULL, "ValueStack missing!");
2315 ciBytecodeStream s(method());
2316 s.reset_to_bci(bci);
2317 int prev_bci = bci;
2318 scope_data()->set_stream(&s);
2319 // iterate
2320 Bytecodes::Code code = Bytecodes::_illegal;
2321 bool push_exception = false;
2323 if (block()->is_set(BlockBegin::exception_entry_flag) && block()->next() == NULL) {
2324 // first thing in the exception entry block should be the exception object.
2325 push_exception = true;
2326 }
2328 while (!bailed_out() && last()->as_BlockEnd() == NULL &&
2329 (code = stream()->next()) != ciBytecodeStream::EOBC() &&
2330 (block_at(s.cur_bci()) == NULL || block_at(s.cur_bci()) == block())) {
2331 assert(state()->kind() == ValueStack::Parsing, "invalid state kind");
2333 // Check for active jsr during OSR compilation
2334 if (compilation()->is_osr_compile()
2335 && scope()->is_top_scope()
2336 && parsing_jsr()
2337 && s.cur_bci() == compilation()->osr_bci()) {
2338 bailout("OSR not supported while a jsr is active");
2339 }
2341 if (push_exception) {
2342 apush(append(new ExceptionObject()));
2343 push_exception = false;
2344 }
2346 // handle bytecode
2347 switch (code) {
2348 case Bytecodes::_nop : /* nothing to do */ break;
2349 case Bytecodes::_aconst_null : apush(append(new Constant(objectNull ))); break;
2350 case Bytecodes::_iconst_m1 : ipush(append(new Constant(new IntConstant (-1)))); break;
2351 case Bytecodes::_iconst_0 : ipush(append(new Constant(intZero ))); break;
2352 case Bytecodes::_iconst_1 : ipush(append(new Constant(intOne ))); break;
2353 case Bytecodes::_iconst_2 : ipush(append(new Constant(new IntConstant ( 2)))); break;
2354 case Bytecodes::_iconst_3 : ipush(append(new Constant(new IntConstant ( 3)))); break;
2355 case Bytecodes::_iconst_4 : ipush(append(new Constant(new IntConstant ( 4)))); break;
2356 case Bytecodes::_iconst_5 : ipush(append(new Constant(new IntConstant ( 5)))); break;
2357 case Bytecodes::_lconst_0 : lpush(append(new Constant(new LongConstant ( 0)))); break;
2358 case Bytecodes::_lconst_1 : lpush(append(new Constant(new LongConstant ( 1)))); break;
2359 case Bytecodes::_fconst_0 : fpush(append(new Constant(new FloatConstant ( 0)))); break;
2360 case Bytecodes::_fconst_1 : fpush(append(new Constant(new FloatConstant ( 1)))); break;
2361 case Bytecodes::_fconst_2 : fpush(append(new Constant(new FloatConstant ( 2)))); break;
2362 case Bytecodes::_dconst_0 : dpush(append(new Constant(new DoubleConstant( 0)))); break;
2363 case Bytecodes::_dconst_1 : dpush(append(new Constant(new DoubleConstant( 1)))); break;
2364 case Bytecodes::_bipush : ipush(append(new Constant(new IntConstant(((signed char*)s.cur_bcp())[1])))); break;
2365 case Bytecodes::_sipush : ipush(append(new Constant(new IntConstant((short)Bytes::get_Java_u2(s.cur_bcp()+1))))); break;
2366 case Bytecodes::_ldc : // fall through
2367 case Bytecodes::_ldc_w : // fall through
2368 case Bytecodes::_ldc2_w : load_constant(); break;
2369 case Bytecodes::_iload : load_local(intType , s.get_index()); break;
2370 case Bytecodes::_lload : load_local(longType , s.get_index()); break;
2371 case Bytecodes::_fload : load_local(floatType , s.get_index()); break;
2372 case Bytecodes::_dload : load_local(doubleType , s.get_index()); break;
2373 case Bytecodes::_aload : load_local(instanceType, s.get_index()); break;
2374 case Bytecodes::_iload_0 : load_local(intType , 0); break;
2375 case Bytecodes::_iload_1 : load_local(intType , 1); break;
2376 case Bytecodes::_iload_2 : load_local(intType , 2); break;
2377 case Bytecodes::_iload_3 : load_local(intType , 3); break;
2378 case Bytecodes::_lload_0 : load_local(longType , 0); break;
2379 case Bytecodes::_lload_1 : load_local(longType , 1); break;
2380 case Bytecodes::_lload_2 : load_local(longType , 2); break;
2381 case Bytecodes::_lload_3 : load_local(longType , 3); break;
2382 case Bytecodes::_fload_0 : load_local(floatType , 0); break;
2383 case Bytecodes::_fload_1 : load_local(floatType , 1); break;
2384 case Bytecodes::_fload_2 : load_local(floatType , 2); break;
2385 case Bytecodes::_fload_3 : load_local(floatType , 3); break;
2386 case Bytecodes::_dload_0 : load_local(doubleType, 0); break;
2387 case Bytecodes::_dload_1 : load_local(doubleType, 1); break;
2388 case Bytecodes::_dload_2 : load_local(doubleType, 2); break;
2389 case Bytecodes::_dload_3 : load_local(doubleType, 3); break;
2390 case Bytecodes::_aload_0 : load_local(objectType, 0); break;
2391 case Bytecodes::_aload_1 : load_local(objectType, 1); break;
2392 case Bytecodes::_aload_2 : load_local(objectType, 2); break;
2393 case Bytecodes::_aload_3 : load_local(objectType, 3); break;
2394 case Bytecodes::_iaload : load_indexed(T_INT ); break;
2395 case Bytecodes::_laload : load_indexed(T_LONG ); break;
2396 case Bytecodes::_faload : load_indexed(T_FLOAT ); break;
2397 case Bytecodes::_daload : load_indexed(T_DOUBLE); break;
2398 case Bytecodes::_aaload : load_indexed(T_OBJECT); break;
2399 case Bytecodes::_baload : load_indexed(T_BYTE ); break;
2400 case Bytecodes::_caload : load_indexed(T_CHAR ); break;
2401 case Bytecodes::_saload : load_indexed(T_SHORT ); break;
2402 case Bytecodes::_istore : store_local(intType , s.get_index()); break;
2403 case Bytecodes::_lstore : store_local(longType , s.get_index()); break;
2404 case Bytecodes::_fstore : store_local(floatType , s.get_index()); break;
2405 case Bytecodes::_dstore : store_local(doubleType, s.get_index()); break;
2406 case Bytecodes::_astore : store_local(objectType, s.get_index()); break;
2407 case Bytecodes::_istore_0 : store_local(intType , 0); break;
2408 case Bytecodes::_istore_1 : store_local(intType , 1); break;
2409 case Bytecodes::_istore_2 : store_local(intType , 2); break;
2410 case Bytecodes::_istore_3 : store_local(intType , 3); break;
2411 case Bytecodes::_lstore_0 : store_local(longType , 0); break;
2412 case Bytecodes::_lstore_1 : store_local(longType , 1); break;
2413 case Bytecodes::_lstore_2 : store_local(longType , 2); break;
2414 case Bytecodes::_lstore_3 : store_local(longType , 3); break;
2415 case Bytecodes::_fstore_0 : store_local(floatType , 0); break;
2416 case Bytecodes::_fstore_1 : store_local(floatType , 1); break;
2417 case Bytecodes::_fstore_2 : store_local(floatType , 2); break;
2418 case Bytecodes::_fstore_3 : store_local(floatType , 3); break;
2419 case Bytecodes::_dstore_0 : store_local(doubleType, 0); break;
2420 case Bytecodes::_dstore_1 : store_local(doubleType, 1); break;
2421 case Bytecodes::_dstore_2 : store_local(doubleType, 2); break;
2422 case Bytecodes::_dstore_3 : store_local(doubleType, 3); break;
2423 case Bytecodes::_astore_0 : store_local(objectType, 0); break;
2424 case Bytecodes::_astore_1 : store_local(objectType, 1); break;
2425 case Bytecodes::_astore_2 : store_local(objectType, 2); break;
2426 case Bytecodes::_astore_3 : store_local(objectType, 3); break;
2427 case Bytecodes::_iastore : store_indexed(T_INT ); break;
2428 case Bytecodes::_lastore : store_indexed(T_LONG ); break;
2429 case Bytecodes::_fastore : store_indexed(T_FLOAT ); break;
2430 case Bytecodes::_dastore : store_indexed(T_DOUBLE); break;
2431 case Bytecodes::_aastore : store_indexed(T_OBJECT); break;
2432 case Bytecodes::_bastore : store_indexed(T_BYTE ); break;
2433 case Bytecodes::_castore : store_indexed(T_CHAR ); break;
2434 case Bytecodes::_sastore : store_indexed(T_SHORT ); break;
2435 case Bytecodes::_pop : // fall through
2436 case Bytecodes::_pop2 : // fall through
2437 case Bytecodes::_dup : // fall through
2438 case Bytecodes::_dup_x1 : // fall through
2439 case Bytecodes::_dup_x2 : // fall through
2440 case Bytecodes::_dup2 : // fall through
2441 case Bytecodes::_dup2_x1 : // fall through
2442 case Bytecodes::_dup2_x2 : // fall through
2443 case Bytecodes::_swap : stack_op(code); break;
2444 case Bytecodes::_iadd : arithmetic_op(intType , code); break;
2445 case Bytecodes::_ladd : arithmetic_op(longType , code); break;
2446 case Bytecodes::_fadd : arithmetic_op(floatType , code); break;
2447 case Bytecodes::_dadd : arithmetic_op(doubleType, code); break;
2448 case Bytecodes::_isub : arithmetic_op(intType , code); break;
2449 case Bytecodes::_lsub : arithmetic_op(longType , code); break;
2450 case Bytecodes::_fsub : arithmetic_op(floatType , code); break;
2451 case Bytecodes::_dsub : arithmetic_op(doubleType, code); break;
2452 case Bytecodes::_imul : arithmetic_op(intType , code); break;
2453 case Bytecodes::_lmul : arithmetic_op(longType , code); break;
2454 case Bytecodes::_fmul : arithmetic_op(floatType , code); break;
2455 case Bytecodes::_dmul : arithmetic_op(doubleType, code); break;
2456 case Bytecodes::_idiv : arithmetic_op(intType , code, copy_state_for_exception()); break;
2457 case Bytecodes::_ldiv : arithmetic_op(longType , code, copy_state_for_exception()); break;
2458 case Bytecodes::_fdiv : arithmetic_op(floatType , code); break;
2459 case Bytecodes::_ddiv : arithmetic_op(doubleType, code); break;
2460 case Bytecodes::_irem : arithmetic_op(intType , code, copy_state_for_exception()); break;
2461 case Bytecodes::_lrem : arithmetic_op(longType , code, copy_state_for_exception()); break;
2462 case Bytecodes::_frem : arithmetic_op(floatType , code); break;
2463 case Bytecodes::_drem : arithmetic_op(doubleType, code); break;
2464 case Bytecodes::_ineg : negate_op(intType ); break;
2465 case Bytecodes::_lneg : negate_op(longType ); break;
2466 case Bytecodes::_fneg : negate_op(floatType ); break;
2467 case Bytecodes::_dneg : negate_op(doubleType); break;
2468 case Bytecodes::_ishl : shift_op(intType , code); break;
2469 case Bytecodes::_lshl : shift_op(longType, code); break;
2470 case Bytecodes::_ishr : shift_op(intType , code); break;
2471 case Bytecodes::_lshr : shift_op(longType, code); break;
2472 case Bytecodes::_iushr : shift_op(intType , code); break;
2473 case Bytecodes::_lushr : shift_op(longType, code); break;
2474 case Bytecodes::_iand : logic_op(intType , code); break;
2475 case Bytecodes::_land : logic_op(longType, code); break;
2476 case Bytecodes::_ior : logic_op(intType , code); break;
2477 case Bytecodes::_lor : logic_op(longType, code); break;
2478 case Bytecodes::_ixor : logic_op(intType , code); break;
2479 case Bytecodes::_lxor : logic_op(longType, code); break;
2480 case Bytecodes::_iinc : increment(); break;
2481 case Bytecodes::_i2l : convert(code, T_INT , T_LONG ); break;
2482 case Bytecodes::_i2f : convert(code, T_INT , T_FLOAT ); break;
2483 case Bytecodes::_i2d : convert(code, T_INT , T_DOUBLE); break;
2484 case Bytecodes::_l2i : convert(code, T_LONG , T_INT ); break;
2485 case Bytecodes::_l2f : convert(code, T_LONG , T_FLOAT ); break;
2486 case Bytecodes::_l2d : convert(code, T_LONG , T_DOUBLE); break;
2487 case Bytecodes::_f2i : convert(code, T_FLOAT , T_INT ); break;
2488 case Bytecodes::_f2l : convert(code, T_FLOAT , T_LONG ); break;
2489 case Bytecodes::_f2d : convert(code, T_FLOAT , T_DOUBLE); break;
2490 case Bytecodes::_d2i : convert(code, T_DOUBLE, T_INT ); break;
2491 case Bytecodes::_d2l : convert(code, T_DOUBLE, T_LONG ); break;
2492 case Bytecodes::_d2f : convert(code, T_DOUBLE, T_FLOAT ); break;
2493 case Bytecodes::_i2b : convert(code, T_INT , T_BYTE ); break;
2494 case Bytecodes::_i2c : convert(code, T_INT , T_CHAR ); break;
2495 case Bytecodes::_i2s : convert(code, T_INT , T_SHORT ); break;
2496 case Bytecodes::_lcmp : compare_op(longType , code); break;
2497 case Bytecodes::_fcmpl : compare_op(floatType , code); break;
2498 case Bytecodes::_fcmpg : compare_op(floatType , code); break;
2499 case Bytecodes::_dcmpl : compare_op(doubleType, code); break;
2500 case Bytecodes::_dcmpg : compare_op(doubleType, code); break;
2501 case Bytecodes::_ifeq : if_zero(intType , If::eql); break;
2502 case Bytecodes::_ifne : if_zero(intType , If::neq); break;
2503 case Bytecodes::_iflt : if_zero(intType , If::lss); break;
2504 case Bytecodes::_ifge : if_zero(intType , If::geq); break;
2505 case Bytecodes::_ifgt : if_zero(intType , If::gtr); break;
2506 case Bytecodes::_ifle : if_zero(intType , If::leq); break;
2507 case Bytecodes::_if_icmpeq : if_same(intType , If::eql); break;
2508 case Bytecodes::_if_icmpne : if_same(intType , If::neq); break;
2509 case Bytecodes::_if_icmplt : if_same(intType , If::lss); break;
2510 case Bytecodes::_if_icmpge : if_same(intType , If::geq); break;
2511 case Bytecodes::_if_icmpgt : if_same(intType , If::gtr); break;
2512 case Bytecodes::_if_icmple : if_same(intType , If::leq); break;
2513 case Bytecodes::_if_acmpeq : if_same(objectType, If::eql); break;
2514 case Bytecodes::_if_acmpne : if_same(objectType, If::neq); break;
2515 case Bytecodes::_goto : _goto(s.cur_bci(), s.get_dest()); break;
2516 case Bytecodes::_jsr : jsr(s.get_dest()); break;
2517 case Bytecodes::_ret : ret(s.get_index()); break;
2518 case Bytecodes::_tableswitch : table_switch(); break;
2519 case Bytecodes::_lookupswitch : lookup_switch(); break;
2520 case Bytecodes::_ireturn : method_return(ipop()); break;
2521 case Bytecodes::_lreturn : method_return(lpop()); break;
2522 case Bytecodes::_freturn : method_return(fpop()); break;
2523 case Bytecodes::_dreturn : method_return(dpop()); break;
2524 case Bytecodes::_areturn : method_return(apop()); break;
2525 case Bytecodes::_return : method_return(NULL ); break;
2526 case Bytecodes::_getstatic : // fall through
2527 case Bytecodes::_putstatic : // fall through
2528 case Bytecodes::_getfield : // fall through
2529 case Bytecodes::_putfield : access_field(code); break;
2530 case Bytecodes::_invokevirtual : // fall through
2531 case Bytecodes::_invokespecial : // fall through
2532 case Bytecodes::_invokestatic : // fall through
2533 case Bytecodes::_invokedynamic : // fall through
2534 case Bytecodes::_invokeinterface: invoke(code); break;
2535 case Bytecodes::_new : new_instance(s.get_index_u2()); break;
2536 case Bytecodes::_newarray : new_type_array(); break;
2537 case Bytecodes::_anewarray : new_object_array(); break;
2538 case Bytecodes::_arraylength : { ValueStack* state_before = copy_state_for_exception(); ipush(append(new ArrayLength(apop(), state_before))); break; }
2539 case Bytecodes::_athrow : throw_op(s.cur_bci()); break;
2540 case Bytecodes::_checkcast : check_cast(s.get_index_u2()); break;
2541 case Bytecodes::_instanceof : instance_of(s.get_index_u2()); break;
2542 case Bytecodes::_monitorenter : monitorenter(apop(), s.cur_bci()); break;
2543 case Bytecodes::_monitorexit : monitorexit (apop(), s.cur_bci()); break;
2544 case Bytecodes::_wide : ShouldNotReachHere(); break;
2545 case Bytecodes::_multianewarray : new_multi_array(s.cur_bcp()[3]); break;
2546 case Bytecodes::_ifnull : if_null(objectType, If::eql); break;
2547 case Bytecodes::_ifnonnull : if_null(objectType, If::neq); break;
2548 case Bytecodes::_goto_w : _goto(s.cur_bci(), s.get_far_dest()); break;
2549 case Bytecodes::_jsr_w : jsr(s.get_far_dest()); break;
2550 case Bytecodes::_breakpoint : BAILOUT_("concurrent setting of breakpoint", NULL);
2551 default : ShouldNotReachHere(); break;
2552 }
2553 // save current bci to setup Goto at the end
2554 prev_bci = s.cur_bci();
2555 }
2556 CHECK_BAILOUT_(NULL);
2557 // stop processing of this block (see try_inline_full)
2558 if (_skip_block) {
2559 _skip_block = false;
2560 assert(_last && _last->as_BlockEnd(), "");
2561 return _last->as_BlockEnd();
2562 }
2563 // if there are any, check if last instruction is a BlockEnd instruction
2564 BlockEnd* end = last()->as_BlockEnd();
2565 if (end == NULL) {
2566 // all blocks must end with a BlockEnd instruction => add a Goto
2567 end = new Goto(block_at(s.cur_bci()), false);
2568 append(end);
2569 }
2570 assert(end == last()->as_BlockEnd(), "inconsistency");
2572 assert(end->state() != NULL, "state must already be present");
2573 assert(end->as_Return() == NULL || end->as_Throw() == NULL || end->state()->stack_size() == 0, "stack not needed for return and throw");
2575 // connect to begin & set state
2576 // NOTE that inlining may have changed the block we are parsing
2577 block()->set_end(end);
2578 // propagate state
2579 for (int i = end->number_of_sux() - 1; i >= 0; i--) {
2580 BlockBegin* sux = end->sux_at(i);
2581 assert(sux->is_predecessor(block()), "predecessor missing");
2582 // be careful, bailout if bytecodes are strange
2583 if (!sux->try_merge(end->state())) BAILOUT_("block join failed", NULL);
2584 scope_data()->add_to_work_list(end->sux_at(i));
2585 }
2587 scope_data()->set_stream(NULL);
2589 // done
2590 return end;
2591 }
2594 void GraphBuilder::iterate_all_blocks(bool start_in_current_block_for_inlining) {
2595 do {
2596 if (start_in_current_block_for_inlining && !bailed_out()) {
2597 iterate_bytecodes_for_block(0);
2598 start_in_current_block_for_inlining = false;
2599 } else {
2600 BlockBegin* b;
2601 while ((b = scope_data()->remove_from_work_list()) != NULL) {
2602 if (!b->is_set(BlockBegin::was_visited_flag)) {
2603 if (b->is_set(BlockBegin::osr_entry_flag)) {
2604 // we're about to parse the osr entry block, so make sure
2605 // we setup the OSR edge leading into this block so that
2606 // Phis get setup correctly.
2607 setup_osr_entry_block();
2608 // this is no longer the osr entry block, so clear it.
2609 b->clear(BlockBegin::osr_entry_flag);
2610 }
2611 b->set(BlockBegin::was_visited_flag);
2612 connect_to_end(b);
2613 }
2614 }
2615 }
2616 } while (!bailed_out() && !scope_data()->is_work_list_empty());
2617 }
2620 bool GraphBuilder::_can_trap [Bytecodes::number_of_java_codes];
2622 void GraphBuilder::initialize() {
2623 // the following bytecodes are assumed to potentially
2624 // throw exceptions in compiled code - note that e.g.
2625 // monitorexit & the return bytecodes do not throw
2626 // exceptions since monitor pairing proved that they
2627 // succeed (if monitor pairing succeeded)
2628 Bytecodes::Code can_trap_list[] =
2629 { Bytecodes::_ldc
2630 , Bytecodes::_ldc_w
2631 , Bytecodes::_ldc2_w
2632 , Bytecodes::_iaload
2633 , Bytecodes::_laload
2634 , Bytecodes::_faload
2635 , Bytecodes::_daload
2636 , Bytecodes::_aaload
2637 , Bytecodes::_baload
2638 , Bytecodes::_caload
2639 , Bytecodes::_saload
2640 , Bytecodes::_iastore
2641 , Bytecodes::_lastore
2642 , Bytecodes::_fastore
2643 , Bytecodes::_dastore
2644 , Bytecodes::_aastore
2645 , Bytecodes::_bastore
2646 , Bytecodes::_castore
2647 , Bytecodes::_sastore
2648 , Bytecodes::_idiv
2649 , Bytecodes::_ldiv
2650 , Bytecodes::_irem
2651 , Bytecodes::_lrem
2652 , Bytecodes::_getstatic
2653 , Bytecodes::_putstatic
2654 , Bytecodes::_getfield
2655 , Bytecodes::_putfield
2656 , Bytecodes::_invokevirtual
2657 , Bytecodes::_invokespecial
2658 , Bytecodes::_invokestatic
2659 , Bytecodes::_invokedynamic
2660 , Bytecodes::_invokeinterface
2661 , Bytecodes::_new
2662 , Bytecodes::_newarray
2663 , Bytecodes::_anewarray
2664 , Bytecodes::_arraylength
2665 , Bytecodes::_athrow
2666 , Bytecodes::_checkcast
2667 , Bytecodes::_instanceof
2668 , Bytecodes::_monitorenter
2669 , Bytecodes::_multianewarray
2670 };
2672 // inititialize trap tables
2673 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) {
2674 _can_trap[i] = false;
2675 }
2676 // set standard trap info
2677 for (uint j = 0; j < ARRAY_SIZE(can_trap_list); j++) {
2678 _can_trap[can_trap_list[j]] = true;
2679 }
2680 }
2683 BlockBegin* GraphBuilder::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) {
2684 assert(entry->is_set(f), "entry/flag mismatch");
2685 // create header block
2686 BlockBegin* h = new BlockBegin(entry->bci());
2687 h->set_depth_first_number(0);
2689 Value l = h;
2690 BlockEnd* g = new Goto(entry, false);
2691 l->set_next(g, entry->bci());
2692 h->set_end(g);
2693 h->set(f);
2694 // setup header block end state
2695 ValueStack* s = state->copy(ValueStack::StateAfter, entry->bci()); // can use copy since stack is empty (=> no phis)
2696 assert(s->stack_is_empty(), "must have empty stack at entry point");
2697 g->set_state(s);
2698 return h;
2699 }
2703 BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* state) {
2704 BlockBegin* start = new BlockBegin(0);
2706 // This code eliminates the empty start block at the beginning of
2707 // each method. Previously, each method started with the
2708 // start-block created below, and this block was followed by the
2709 // header block that was always empty. This header block is only
2710 // necesary if std_entry is also a backward branch target because
2711 // then phi functions may be necessary in the header block. It's
2712 // also necessary when profiling so that there's a single block that
2713 // can increment the interpreter_invocation_count.
2714 BlockBegin* new_header_block;
2715 if (std_entry->number_of_preds() > 0 || count_invocations() || count_backedges()) {
2716 new_header_block = header_block(std_entry, BlockBegin::std_entry_flag, state);
2717 } else {
2718 new_header_block = std_entry;
2719 }
2721 // setup start block (root for the IR graph)
2722 Base* base =
2723 new Base(
2724 new_header_block,
2725 osr_entry
2726 );
2727 start->set_next(base, 0);
2728 start->set_end(base);
2729 // create & setup state for start block
2730 start->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
2731 base->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
2733 if (base->std_entry()->state() == NULL) {
2734 // setup states for header blocks
2735 base->std_entry()->merge(state);
2736 }
2738 assert(base->std_entry()->state() != NULL, "");
2739 return start;
2740 }
2743 void GraphBuilder::setup_osr_entry_block() {
2744 assert(compilation()->is_osr_compile(), "only for osrs");
2746 int osr_bci = compilation()->osr_bci();
2747 ciBytecodeStream s(method());
2748 s.reset_to_bci(osr_bci);
2749 s.next();
2750 scope_data()->set_stream(&s);
2752 // create a new block to be the osr setup code
2753 _osr_entry = new BlockBegin(osr_bci);
2754 _osr_entry->set(BlockBegin::osr_entry_flag);
2755 _osr_entry->set_depth_first_number(0);
2756 BlockBegin* target = bci2block()->at(osr_bci);
2757 assert(target != NULL && target->is_set(BlockBegin::osr_entry_flag), "must be there");
2758 // the osr entry has no values for locals
2759 ValueStack* state = target->state()->copy();
2760 _osr_entry->set_state(state);
2762 kill_all();
2763 _block = _osr_entry;
2764 _state = _osr_entry->state()->copy();
2765 assert(_state->bci() == osr_bci, "mismatch");
2766 _last = _osr_entry;
2767 Value e = append(new OsrEntry());
2768 e->set_needs_null_check(false);
2770 // OSR buffer is
2771 //
2772 // locals[nlocals-1..0]
2773 // monitors[number_of_locks-1..0]
2774 //
2775 // locals is a direct copy of the interpreter frame so in the osr buffer
2776 // so first slot in the local array is the last local from the interpreter
2777 // and last slot is local[0] (receiver) from the interpreter
2778 //
2779 // Similarly with locks. The first lock slot in the osr buffer is the nth lock
2780 // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock
2781 // in the interpreter frame (the method lock if a sync method)
2783 // Initialize monitors in the compiled activation.
2785 int index;
2786 Value local;
2788 // find all the locals that the interpreter thinks contain live oops
2789 const BitMap live_oops = method()->live_local_oops_at_bci(osr_bci);
2791 // compute the offset into the locals so that we can treat the buffer
2792 // as if the locals were still in the interpreter frame
2793 int locals_offset = BytesPerWord * (method()->max_locals() - 1);
2794 for_each_local_value(state, index, local) {
2795 int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord;
2796 Value get;
2797 if (local->type()->is_object_kind() && !live_oops.at(index)) {
2798 // The interpreter thinks this local is dead but the compiler
2799 // doesn't so pretend that the interpreter passed in null.
2800 get = append(new Constant(objectNull));
2801 } else {
2802 get = append(new UnsafeGetRaw(as_BasicType(local->type()), e,
2803 append(new Constant(new IntConstant(offset))),
2804 0,
2805 true /*unaligned*/, true /*wide*/));
2806 }
2807 _state->store_local(index, get);
2808 }
2810 // the storage for the OSR buffer is freed manually in the LIRGenerator.
2812 assert(state->caller_state() == NULL, "should be top scope");
2813 state->clear_locals();
2814 Goto* g = new Goto(target, false);
2815 append(g);
2816 _osr_entry->set_end(g);
2817 target->merge(_osr_entry->end()->state());
2819 scope_data()->set_stream(NULL);
2820 }
2823 ValueStack* GraphBuilder::state_at_entry() {
2824 ValueStack* state = new ValueStack(scope(), NULL);
2826 // Set up locals for receiver
2827 int idx = 0;
2828 if (!method()->is_static()) {
2829 // we should always see the receiver
2830 state->store_local(idx, new Local(objectType, idx));
2831 idx = 1;
2832 }
2834 // Set up locals for incoming arguments
2835 ciSignature* sig = method()->signature();
2836 for (int i = 0; i < sig->count(); i++) {
2837 ciType* type = sig->type_at(i);
2838 BasicType basic_type = type->basic_type();
2839 // don't allow T_ARRAY to propagate into locals types
2840 if (basic_type == T_ARRAY) basic_type = T_OBJECT;
2841 ValueType* vt = as_ValueType(basic_type);
2842 state->store_local(idx, new Local(vt, idx));
2843 idx += type->size();
2844 }
2846 // lock synchronized method
2847 if (method()->is_synchronized()) {
2848 state->lock(NULL);
2849 }
2851 return state;
2852 }
2855 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope)
2856 : _scope_data(NULL)
2857 , _instruction_count(0)
2858 , _osr_entry(NULL)
2859 , _memory(new MemoryBuffer())
2860 , _compilation(compilation)
2861 , _inline_bailout_msg(NULL)
2862 {
2863 int osr_bci = compilation->osr_bci();
2865 // determine entry points and bci2block mapping
2866 BlockListBuilder blm(compilation, scope, osr_bci);
2867 CHECK_BAILOUT();
2869 BlockList* bci2block = blm.bci2block();
2870 BlockBegin* start_block = bci2block->at(0);
2872 push_root_scope(scope, bci2block, start_block);
2874 // setup state for std entry
2875 _initial_state = state_at_entry();
2876 start_block->merge(_initial_state);
2878 // complete graph
2879 _vmap = new ValueMap();
2880 switch (scope->method()->intrinsic_id()) {
2881 case vmIntrinsics::_dabs : // fall through
2882 case vmIntrinsics::_dsqrt : // fall through
2883 case vmIntrinsics::_dsin : // fall through
2884 case vmIntrinsics::_dcos : // fall through
2885 case vmIntrinsics::_dtan : // fall through
2886 case vmIntrinsics::_dlog : // fall through
2887 case vmIntrinsics::_dlog10 : // fall through
2888 {
2889 // Compiles where the root method is an intrinsic need a special
2890 // compilation environment because the bytecodes for the method
2891 // shouldn't be parsed during the compilation, only the special
2892 // Intrinsic node should be emitted. If this isn't done the the
2893 // code for the inlined version will be different than the root
2894 // compiled version which could lead to monotonicity problems on
2895 // intel.
2897 // Set up a stream so that appending instructions works properly.
2898 ciBytecodeStream s(scope->method());
2899 s.reset_to_bci(0);
2900 scope_data()->set_stream(&s);
2901 s.next();
2903 // setup the initial block state
2904 _block = start_block;
2905 _state = start_block->state()->copy_for_parsing();
2906 _last = start_block;
2907 load_local(doubleType, 0);
2909 // Emit the intrinsic node.
2910 bool result = try_inline_intrinsics(scope->method());
2911 if (!result) BAILOUT("failed to inline intrinsic");
2912 method_return(dpop());
2914 // connect the begin and end blocks and we're all done.
2915 BlockEnd* end = last()->as_BlockEnd();
2916 block()->set_end(end);
2917 break;
2918 }
2919 default:
2920 scope_data()->add_to_work_list(start_block);
2921 iterate_all_blocks();
2922 break;
2923 }
2924 CHECK_BAILOUT();
2926 _start = setup_start_block(osr_bci, start_block, _osr_entry, _initial_state);
2928 eliminate_redundant_phis(_start);
2930 NOT_PRODUCT(if (PrintValueNumbering && Verbose) print_stats());
2931 // for osr compile, bailout if some requirements are not fulfilled
2932 if (osr_bci != -1) {
2933 BlockBegin* osr_block = blm.bci2block()->at(osr_bci);
2934 assert(osr_block->is_set(BlockBegin::was_visited_flag),"osr entry must have been visited for osr compile");
2936 // check if osr entry point has empty stack - we cannot handle non-empty stacks at osr entry points
2937 if (!osr_block->state()->stack_is_empty()) {
2938 BAILOUT("stack not empty at OSR entry point");
2939 }
2940 }
2941 #ifndef PRODUCT
2942 if (PrintCompilation && Verbose) tty->print_cr("Created %d Instructions", _instruction_count);
2943 #endif
2944 }
2947 ValueStack* GraphBuilder::copy_state_before() {
2948 return copy_state_before_with_bci(bci());
2949 }
2951 ValueStack* GraphBuilder::copy_state_exhandling() {
2952 return copy_state_exhandling_with_bci(bci());
2953 }
2955 ValueStack* GraphBuilder::copy_state_for_exception() {
2956 return copy_state_for_exception_with_bci(bci());
2957 }
2959 ValueStack* GraphBuilder::copy_state_before_with_bci(int bci) {
2960 return state()->copy(ValueStack::StateBefore, bci);
2961 }
2963 ValueStack* GraphBuilder::copy_state_exhandling_with_bci(int bci) {
2964 if (!has_handler()) return NULL;
2965 return state()->copy(ValueStack::StateBefore, bci);
2966 }
2968 ValueStack* GraphBuilder::copy_state_for_exception_with_bci(int bci) {
2969 ValueStack* s = copy_state_exhandling_with_bci(bci);
2970 if (s == NULL) {
2971 if (_compilation->env()->jvmti_can_access_local_variables()) {
2972 s = state()->copy(ValueStack::ExceptionState, bci);
2973 } else {
2974 s = state()->copy(ValueStack::EmptyExceptionState, bci);
2975 }
2976 }
2977 return s;
2978 }
2980 int GraphBuilder::recursive_inline_level(ciMethod* cur_callee) const {
2981 int recur_level = 0;
2982 for (IRScope* s = scope(); s != NULL; s = s->caller()) {
2983 if (s->method() == cur_callee) {
2984 ++recur_level;
2985 }
2986 }
2987 return recur_level;
2988 }
2991 bool GraphBuilder::try_inline(ciMethod* callee, bool holder_known) {
2992 // Clear out any existing inline bailout condition
2993 clear_inline_bailout();
2995 if (callee->should_exclude()) {
2996 // callee is excluded
2997 INLINE_BAILOUT("excluded by CompilerOracle")
2998 } else if (!callee->can_be_compiled()) {
2999 // callee is not compilable (prob. has breakpoints)
3000 INLINE_BAILOUT("not compilable")
3001 } else if (callee->intrinsic_id() != vmIntrinsics::_none && try_inline_intrinsics(callee)) {
3002 // intrinsics can be native or not
3003 return true;
3004 } else if (callee->is_native()) {
3005 // non-intrinsic natives cannot be inlined
3006 INLINE_BAILOUT("non-intrinsic native")
3007 } else if (callee->is_abstract()) {
3008 INLINE_BAILOUT("abstract")
3009 } else {
3010 return try_inline_full(callee, holder_known);
3011 }
3012 }
3015 bool GraphBuilder::try_inline_intrinsics(ciMethod* callee) {
3016 if (!InlineNatives ) INLINE_BAILOUT("intrinsic method inlining disabled");
3017 if (callee->is_synchronized()) {
3018 // We don't currently support any synchronized intrinsics
3019 return false;
3020 }
3022 // callee seems like a good candidate
3023 // determine id
3024 bool preserves_state = false;
3025 bool cantrap = true;
3026 vmIntrinsics::ID id = callee->intrinsic_id();
3027 switch (id) {
3028 case vmIntrinsics::_arraycopy :
3029 if (!InlineArrayCopy) return false;
3030 break;
3032 case vmIntrinsics::_currentTimeMillis:
3033 case vmIntrinsics::_nanoTime:
3034 preserves_state = true;
3035 cantrap = false;
3036 break;
3038 case vmIntrinsics::_floatToRawIntBits :
3039 case vmIntrinsics::_intBitsToFloat :
3040 case vmIntrinsics::_doubleToRawLongBits :
3041 case vmIntrinsics::_longBitsToDouble :
3042 if (!InlineMathNatives) return false;
3043 preserves_state = true;
3044 cantrap = false;
3045 break;
3047 case vmIntrinsics::_getClass :
3048 if (!InlineClassNatives) return false;
3049 preserves_state = true;
3050 break;
3052 case vmIntrinsics::_currentThread :
3053 if (!InlineThreadNatives) return false;
3054 preserves_state = true;
3055 cantrap = false;
3056 break;
3058 case vmIntrinsics::_dabs : // fall through
3059 case vmIntrinsics::_dsqrt : // fall through
3060 case vmIntrinsics::_dsin : // fall through
3061 case vmIntrinsics::_dcos : // fall through
3062 case vmIntrinsics::_dtan : // fall through
3063 case vmIntrinsics::_dlog : // fall through
3064 case vmIntrinsics::_dlog10 : // fall through
3065 if (!InlineMathNatives) return false;
3066 cantrap = false;
3067 preserves_state = true;
3068 break;
3070 // sun/misc/AtomicLong.attemptUpdate
3071 case vmIntrinsics::_attemptUpdate :
3072 if (!VM_Version::supports_cx8()) return false;
3073 if (!InlineAtomicLong) return false;
3074 preserves_state = true;
3075 break;
3077 // Use special nodes for Unsafe instructions so we can more easily
3078 // perform an address-mode optimization on the raw variants
3079 case vmIntrinsics::_getObject : return append_unsafe_get_obj(callee, T_OBJECT, false);
3080 case vmIntrinsics::_getBoolean: return append_unsafe_get_obj(callee, T_BOOLEAN, false);
3081 case vmIntrinsics::_getByte : return append_unsafe_get_obj(callee, T_BYTE, false);
3082 case vmIntrinsics::_getShort : return append_unsafe_get_obj(callee, T_SHORT, false);
3083 case vmIntrinsics::_getChar : return append_unsafe_get_obj(callee, T_CHAR, false);
3084 case vmIntrinsics::_getInt : return append_unsafe_get_obj(callee, T_INT, false);
3085 case vmIntrinsics::_getLong : return append_unsafe_get_obj(callee, T_LONG, false);
3086 case vmIntrinsics::_getFloat : return append_unsafe_get_obj(callee, T_FLOAT, false);
3087 case vmIntrinsics::_getDouble : return append_unsafe_get_obj(callee, T_DOUBLE, false);
3089 case vmIntrinsics::_putObject : return append_unsafe_put_obj(callee, T_OBJECT, false);
3090 case vmIntrinsics::_putBoolean: return append_unsafe_put_obj(callee, T_BOOLEAN, false);
3091 case vmIntrinsics::_putByte : return append_unsafe_put_obj(callee, T_BYTE, false);
3092 case vmIntrinsics::_putShort : return append_unsafe_put_obj(callee, T_SHORT, false);
3093 case vmIntrinsics::_putChar : return append_unsafe_put_obj(callee, T_CHAR, false);
3094 case vmIntrinsics::_putInt : return append_unsafe_put_obj(callee, T_INT, false);
3095 case vmIntrinsics::_putLong : return append_unsafe_put_obj(callee, T_LONG, false);
3096 case vmIntrinsics::_putFloat : return append_unsafe_put_obj(callee, T_FLOAT, false);
3097 case vmIntrinsics::_putDouble : return append_unsafe_put_obj(callee, T_DOUBLE, false);
3099 case vmIntrinsics::_getObjectVolatile : return append_unsafe_get_obj(callee, T_OBJECT, true);
3100 case vmIntrinsics::_getBooleanVolatile: return append_unsafe_get_obj(callee, T_BOOLEAN, true);
3101 case vmIntrinsics::_getByteVolatile : return append_unsafe_get_obj(callee, T_BYTE, true);
3102 case vmIntrinsics::_getShortVolatile : return append_unsafe_get_obj(callee, T_SHORT, true);
3103 case vmIntrinsics::_getCharVolatile : return append_unsafe_get_obj(callee, T_CHAR, true);
3104 case vmIntrinsics::_getIntVolatile : return append_unsafe_get_obj(callee, T_INT, true);
3105 case vmIntrinsics::_getLongVolatile : return append_unsafe_get_obj(callee, T_LONG, true);
3106 case vmIntrinsics::_getFloatVolatile : return append_unsafe_get_obj(callee, T_FLOAT, true);
3107 case vmIntrinsics::_getDoubleVolatile : return append_unsafe_get_obj(callee, T_DOUBLE, true);
3109 case vmIntrinsics::_putObjectVolatile : return append_unsafe_put_obj(callee, T_OBJECT, true);
3110 case vmIntrinsics::_putBooleanVolatile: return append_unsafe_put_obj(callee, T_BOOLEAN, true);
3111 case vmIntrinsics::_putByteVolatile : return append_unsafe_put_obj(callee, T_BYTE, true);
3112 case vmIntrinsics::_putShortVolatile : return append_unsafe_put_obj(callee, T_SHORT, true);
3113 case vmIntrinsics::_putCharVolatile : return append_unsafe_put_obj(callee, T_CHAR, true);
3114 case vmIntrinsics::_putIntVolatile : return append_unsafe_put_obj(callee, T_INT, true);
3115 case vmIntrinsics::_putLongVolatile : return append_unsafe_put_obj(callee, T_LONG, true);
3116 case vmIntrinsics::_putFloatVolatile : return append_unsafe_put_obj(callee, T_FLOAT, true);
3117 case vmIntrinsics::_putDoubleVolatile : return append_unsafe_put_obj(callee, T_DOUBLE, true);
3119 case vmIntrinsics::_getByte_raw : return append_unsafe_get_raw(callee, T_BYTE);
3120 case vmIntrinsics::_getShort_raw : return append_unsafe_get_raw(callee, T_SHORT);
3121 case vmIntrinsics::_getChar_raw : return append_unsafe_get_raw(callee, T_CHAR);
3122 case vmIntrinsics::_getInt_raw : return append_unsafe_get_raw(callee, T_INT);
3123 case vmIntrinsics::_getLong_raw : return append_unsafe_get_raw(callee, T_LONG);
3124 case vmIntrinsics::_getFloat_raw : return append_unsafe_get_raw(callee, T_FLOAT);
3125 case vmIntrinsics::_getDouble_raw : return append_unsafe_get_raw(callee, T_DOUBLE);
3127 case vmIntrinsics::_putByte_raw : return append_unsafe_put_raw(callee, T_BYTE);
3128 case vmIntrinsics::_putShort_raw : return append_unsafe_put_raw(callee, T_SHORT);
3129 case vmIntrinsics::_putChar_raw : return append_unsafe_put_raw(callee, T_CHAR);
3130 case vmIntrinsics::_putInt_raw : return append_unsafe_put_raw(callee, T_INT);
3131 case vmIntrinsics::_putLong_raw : return append_unsafe_put_raw(callee, T_LONG);
3132 case vmIntrinsics::_putFloat_raw : return append_unsafe_put_raw(callee, T_FLOAT);
3133 case vmIntrinsics::_putDouble_raw : return append_unsafe_put_raw(callee, T_DOUBLE);
3135 case vmIntrinsics::_prefetchRead : return append_unsafe_prefetch(callee, false, false);
3136 case vmIntrinsics::_prefetchWrite : return append_unsafe_prefetch(callee, false, true);
3137 case vmIntrinsics::_prefetchReadStatic : return append_unsafe_prefetch(callee, true, false);
3138 case vmIntrinsics::_prefetchWriteStatic : return append_unsafe_prefetch(callee, true, true);
3140 case vmIntrinsics::_checkIndex :
3141 if (!InlineNIOCheckIndex) return false;
3142 preserves_state = true;
3143 break;
3144 case vmIntrinsics::_putOrderedObject : return append_unsafe_put_obj(callee, T_OBJECT, true);
3145 case vmIntrinsics::_putOrderedInt : return append_unsafe_put_obj(callee, T_INT, true);
3146 case vmIntrinsics::_putOrderedLong : return append_unsafe_put_obj(callee, T_LONG, true);
3148 case vmIntrinsics::_compareAndSwapLong:
3149 if (!VM_Version::supports_cx8()) return false;
3150 // fall through
3151 case vmIntrinsics::_compareAndSwapInt:
3152 case vmIntrinsics::_compareAndSwapObject:
3153 append_unsafe_CAS(callee);
3154 return true;
3156 default : return false; // do not inline
3157 }
3158 // create intrinsic node
3159 const bool has_receiver = !callee->is_static();
3160 ValueType* result_type = as_ValueType(callee->return_type());
3161 ValueStack* state_before = copy_state_for_exception();
3163 Values* args = state()->pop_arguments(callee->arg_size());
3165 if (is_profiling()) {
3166 // Don't profile in the special case where the root method
3167 // is the intrinsic
3168 if (callee != method()) {
3169 // Note that we'd collect profile data in this method if we wanted it.
3170 compilation()->set_would_profile(true);
3171 if (profile_calls()) {
3172 Value recv = NULL;
3173 if (has_receiver) {
3174 recv = args->at(0);
3175 null_check(recv);
3176 }
3177 profile_call(recv, NULL);
3178 }
3179 }
3180 }
3182 Intrinsic* result = new Intrinsic(result_type, id, args, has_receiver, state_before,
3183 preserves_state, cantrap);
3184 // append instruction & push result
3185 Value value = append_split(result);
3186 if (result_type != voidType) push(result_type, value);
3188 #ifndef PRODUCT
3189 // printing
3190 if (PrintInlining) {
3191 print_inline_result(callee, true);
3192 }
3193 #endif
3195 // done
3196 return true;
3197 }
3200 bool GraphBuilder::try_inline_jsr(int jsr_dest_bci) {
3201 // Introduce a new callee continuation point - all Ret instructions
3202 // will be replaced with Gotos to this point.
3203 BlockBegin* cont = block_at(next_bci());
3204 assert(cont != NULL, "continuation must exist (BlockListBuilder starts a new block after a jsr");
3206 // Note: can not assign state to continuation yet, as we have to
3207 // pick up the state from the Ret instructions.
3209 // Push callee scope
3210 push_scope_for_jsr(cont, jsr_dest_bci);
3212 // Temporarily set up bytecode stream so we can append instructions
3213 // (only using the bci of this stream)
3214 scope_data()->set_stream(scope_data()->parent()->stream());
3216 BlockBegin* jsr_start_block = block_at(jsr_dest_bci);
3217 assert(jsr_start_block != NULL, "jsr start block must exist");
3218 assert(!jsr_start_block->is_set(BlockBegin::was_visited_flag), "should not have visited jsr yet");
3219 Goto* goto_sub = new Goto(jsr_start_block, false);
3220 // Must copy state to avoid wrong sharing when parsing bytecodes
3221 assert(jsr_start_block->state() == NULL, "should have fresh jsr starting block");
3222 jsr_start_block->set_state(copy_state_before_with_bci(jsr_dest_bci));
3223 append(goto_sub);
3224 _block->set_end(goto_sub);
3225 _last = _block = jsr_start_block;
3227 // Clear out bytecode stream
3228 scope_data()->set_stream(NULL);
3230 scope_data()->add_to_work_list(jsr_start_block);
3232 // Ready to resume parsing in subroutine
3233 iterate_all_blocks();
3235 // If we bailed out during parsing, return immediately (this is bad news)
3236 CHECK_BAILOUT_(false);
3238 // Detect whether the continuation can actually be reached. If not,
3239 // it has not had state set by the join() operations in
3240 // iterate_bytecodes_for_block()/ret() and we should not touch the
3241 // iteration state. The calling activation of
3242 // iterate_bytecodes_for_block will then complete normally.
3243 if (cont->state() != NULL) {
3244 if (!cont->is_set(BlockBegin::was_visited_flag)) {
3245 // add continuation to work list instead of parsing it immediately
3246 scope_data()->parent()->add_to_work_list(cont);
3247 }
3248 }
3250 assert(jsr_continuation() == cont, "continuation must not have changed");
3251 assert(!jsr_continuation()->is_set(BlockBegin::was_visited_flag) ||
3252 jsr_continuation()->is_set(BlockBegin::parser_loop_header_flag),
3253 "continuation can only be visited in case of backward branches");
3254 assert(_last && _last->as_BlockEnd(), "block must have end");
3256 // continuation is in work list, so end iteration of current block
3257 _skip_block = true;
3258 pop_scope_for_jsr();
3260 return true;
3261 }
3264 // Inline the entry of a synchronized method as a monitor enter and
3265 // register the exception handler which releases the monitor if an
3266 // exception is thrown within the callee. Note that the monitor enter
3267 // cannot throw an exception itself, because the receiver is
3268 // guaranteed to be non-null by the explicit null check at the
3269 // beginning of inlining.
3270 void GraphBuilder::inline_sync_entry(Value lock, BlockBegin* sync_handler) {
3271 assert(lock != NULL && sync_handler != NULL, "lock or handler missing");
3273 monitorenter(lock, SynchronizationEntryBCI);
3274 assert(_last->as_MonitorEnter() != NULL, "monitor enter expected");
3275 _last->set_needs_null_check(false);
3277 sync_handler->set(BlockBegin::exception_entry_flag);
3278 sync_handler->set(BlockBegin::is_on_work_list_flag);
3280 ciExceptionHandler* desc = new ciExceptionHandler(method()->holder(), 0, method()->code_size(), -1, 0);
3281 XHandler* h = new XHandler(desc);
3282 h->set_entry_block(sync_handler);
3283 scope_data()->xhandlers()->append(h);
3284 scope_data()->set_has_handler();
3285 }
3288 // If an exception is thrown and not handled within an inlined
3289 // synchronized method, the monitor must be released before the
3290 // exception is rethrown in the outer scope. Generate the appropriate
3291 // instructions here.
3292 void GraphBuilder::fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler) {
3293 BlockBegin* orig_block = _block;
3294 ValueStack* orig_state = _state;
3295 Instruction* orig_last = _last;
3296 _last = _block = sync_handler;
3297 _state = sync_handler->state()->copy();
3299 assert(sync_handler != NULL, "handler missing");
3300 assert(!sync_handler->is_set(BlockBegin::was_visited_flag), "is visited here");
3302 assert(lock != NULL || default_handler, "lock or handler missing");
3304 XHandler* h = scope_data()->xhandlers()->remove_last();
3305 assert(h->entry_block() == sync_handler, "corrupt list of handlers");
3307 block()->set(BlockBegin::was_visited_flag);
3308 Value exception = append_with_bci(new ExceptionObject(), SynchronizationEntryBCI);
3309 assert(exception->is_pinned(), "must be");
3311 if (compilation()->env()->dtrace_method_probes()) {
3312 // Report exit from inline methods
3313 Values* args = new Values(1);
3314 args->push(append(new Constant(new ObjectConstant(method()))));
3315 append(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args));
3316 }
3318 int bci = SynchronizationEntryBCI;
3319 if (lock) {
3320 assert(state()->locks_size() > 0 && state()->lock_at(state()->locks_size() - 1) == lock, "lock is missing");
3321 if (!lock->is_linked()) {
3322 lock = append_with_bci(lock, -1);
3323 }
3325 // exit the monitor in the context of the synchronized method
3326 monitorexit(lock, SynchronizationEntryBCI);
3328 // exit the context of the synchronized method
3329 if (!default_handler) {
3330 pop_scope();
3331 bci = _state->caller_state()->bci();
3332 _state = _state->caller_state()->copy_for_parsing();
3333 }
3334 }
3336 // perform the throw as if at the the call site
3337 apush(exception);
3338 throw_op(bci);
3340 BlockEnd* end = last()->as_BlockEnd();
3341 block()->set_end(end);
3343 _block = orig_block;
3344 _state = orig_state;
3345 _last = orig_last;
3346 }
3349 bool GraphBuilder::try_inline_full(ciMethod* callee, bool holder_known) {
3350 assert(!callee->is_native(), "callee must not be native");
3351 if (count_backedges() && callee->has_loops()) {
3352 INLINE_BAILOUT("too complex for tiered");
3353 }
3354 // first perform tests of things it's not possible to inline
3355 if (callee->has_exception_handlers() &&
3356 !InlineMethodsWithExceptionHandlers) INLINE_BAILOUT("callee has exception handlers");
3357 if (callee->is_synchronized() &&
3358 !InlineSynchronizedMethods ) INLINE_BAILOUT("callee is synchronized");
3359 if (!callee->holder()->is_initialized()) INLINE_BAILOUT("callee's klass not initialized yet");
3360 if (!callee->has_balanced_monitors()) INLINE_BAILOUT("callee's monitors do not match");
3362 // Proper inlining of methods with jsrs requires a little more work.
3363 if (callee->has_jsrs() ) INLINE_BAILOUT("jsrs not handled properly by inliner yet");
3365 // now perform tests that are based on flag settings
3366 if (inline_level() > MaxInlineLevel ) INLINE_BAILOUT("too-deep inlining");
3367 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("too-deep recursive inlining");
3368 if (callee->code_size() > max_inline_size() ) INLINE_BAILOUT("callee is too large");
3370 // don't inline throwable methods unless the inlining tree is rooted in a throwable class
3371 if (callee->name() == ciSymbol::object_initializer_name() &&
3372 callee->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
3373 // Throwable constructor call
3374 IRScope* top = scope();
3375 while (top->caller() != NULL) {
3376 top = top->caller();
3377 }
3378 if (!top->method()->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
3379 INLINE_BAILOUT("don't inline Throwable constructors");
3380 }
3381 }
3383 // When SSE2 is used on intel, then no special handling is needed
3384 // for strictfp because the enum-constant is fixed at compile time,
3385 // the check for UseSSE2 is needed here
3386 if (strict_fp_requires_explicit_rounding && UseSSE < 2 && method()->is_strict() != callee->is_strict()) {
3387 INLINE_BAILOUT("caller and callee have different strict fp requirements");
3388 }
3390 if (compilation()->env()->num_inlined_bytecodes() > DesiredMethodLimit) {
3391 INLINE_BAILOUT("total inlining greater than DesiredMethodLimit");
3392 }
3394 if (is_profiling() && !callee->ensure_method_data()) {
3395 INLINE_BAILOUT("mdo allocation failed");
3396 }
3397 #ifndef PRODUCT
3398 // printing
3399 if (PrintInlining) {
3400 print_inline_result(callee, true);
3401 }
3402 #endif
3404 // NOTE: Bailouts from this point on, which occur at the
3405 // GraphBuilder level, do not cause bailout just of the inlining but
3406 // in fact of the entire compilation.
3408 BlockBegin* orig_block = block();
3410 const int args_base = state()->stack_size() - callee->arg_size();
3411 assert(args_base >= 0, "stack underflow during inlining");
3413 // Insert null check if necessary
3414 Value recv = NULL;
3415 if (code() != Bytecodes::_invokestatic) {
3416 // note: null check must happen even if first instruction of callee does
3417 // an implicit null check since the callee is in a different scope
3418 // and we must make sure exception handling does the right thing
3419 assert(!callee->is_static(), "callee must not be static");
3420 assert(callee->arg_size() > 0, "must have at least a receiver");
3421 recv = state()->stack_at(args_base);
3422 null_check(recv);
3423 }
3425 if (is_profiling()) {
3426 // Note that we'd collect profile data in this method if we wanted it.
3427 // this may be redundant here...
3428 compilation()->set_would_profile(true);
3430 if (profile_calls()) {
3431 profile_call(recv, holder_known ? callee->holder() : NULL);
3432 }
3433 if (profile_inlined_calls()) {
3434 profile_invocation(callee, copy_state_before());
3435 }
3436 }
3438 // Introduce a new callee continuation point - if the callee has
3439 // more than one return instruction or the return does not allow
3440 // fall-through of control flow, all return instructions of the
3441 // callee will need to be replaced by Goto's pointing to this
3442 // continuation point.
3443 BlockBegin* cont = block_at(next_bci());
3444 bool continuation_existed = true;
3445 if (cont == NULL) {
3446 cont = new BlockBegin(next_bci());
3447 // low number so that continuation gets parsed as early as possible
3448 cont->set_depth_first_number(0);
3449 #ifndef PRODUCT
3450 if (PrintInitialBlockList) {
3451 tty->print_cr("CFG: created block %d (bci %d) as continuation for inline at bci %d",
3452 cont->block_id(), cont->bci(), bci());
3453 }
3454 #endif
3455 continuation_existed = false;
3456 }
3457 // Record number of predecessors of continuation block before
3458 // inlining, to detect if inlined method has edges to its
3459 // continuation after inlining.
3460 int continuation_preds = cont->number_of_preds();
3462 // Push callee scope
3463 push_scope(callee, cont);
3465 // the BlockListBuilder for the callee could have bailed out
3466 CHECK_BAILOUT_(false);
3468 // Temporarily set up bytecode stream so we can append instructions
3469 // (only using the bci of this stream)
3470 scope_data()->set_stream(scope_data()->parent()->stream());
3472 // Pass parameters into callee state: add assignments
3473 // note: this will also ensure that all arguments are computed before being passed
3474 ValueStack* callee_state = state();
3475 ValueStack* caller_state = state()->caller_state();
3476 { int i = args_base;
3477 while (i < caller_state->stack_size()) {
3478 const int par_no = i - args_base;
3479 Value arg = caller_state->stack_at_inc(i);
3480 // NOTE: take base() of arg->type() to avoid problems storing
3481 // constants
3482 store_local(callee_state, arg, arg->type()->base(), par_no);
3483 }
3484 }
3486 // Remove args from stack.
3487 // Note that we preserve locals state in case we can use it later
3488 // (see use of pop_scope() below)
3489 caller_state->truncate_stack(args_base);
3490 assert(callee_state->stack_size() == 0, "callee stack must be empty");
3492 Value lock;
3493 BlockBegin* sync_handler;
3495 // Inline the locking of the receiver if the callee is synchronized
3496 if (callee->is_synchronized()) {
3497 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror())))
3498 : state()->local_at(0);
3499 sync_handler = new BlockBegin(SynchronizationEntryBCI);
3500 inline_sync_entry(lock, sync_handler);
3501 }
3503 if (compilation()->env()->dtrace_method_probes()) {
3504 Values* args = new Values(1);
3505 args->push(append(new Constant(new ObjectConstant(method()))));
3506 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args));
3507 }
3509 BlockBegin* callee_start_block = block_at(0);
3510 if (callee_start_block != NULL) {
3511 assert(callee_start_block->is_set(BlockBegin::parser_loop_header_flag), "must be loop header");
3512 Goto* goto_callee = new Goto(callee_start_block, false);
3513 // The state for this goto is in the scope of the callee, so use
3514 // the entry bci for the callee instead of the call site bci.
3515 append_with_bci(goto_callee, 0);
3516 _block->set_end(goto_callee);
3517 callee_start_block->merge(callee_state);
3519 _last = _block = callee_start_block;
3521 scope_data()->add_to_work_list(callee_start_block);
3522 }
3524 // Clear out bytecode stream
3525 scope_data()->set_stream(NULL);
3527 // Ready to resume parsing in callee (either in the same block we
3528 // were in before or in the callee's start block)
3529 iterate_all_blocks(callee_start_block == NULL);
3531 // If we bailed out during parsing, return immediately (this is bad news)
3532 if (bailed_out()) return false;
3534 // iterate_all_blocks theoretically traverses in random order; in
3535 // practice, we have only traversed the continuation if we are
3536 // inlining into a subroutine
3537 assert(continuation_existed ||
3538 !continuation()->is_set(BlockBegin::was_visited_flag),
3539 "continuation should not have been parsed yet if we created it");
3541 // If we bailed out during parsing, return immediately (this is bad news)
3542 CHECK_BAILOUT_(false);
3544 // At this point we are almost ready to return and resume parsing of
3545 // the caller back in the GraphBuilder. The only thing we want to do
3546 // first is an optimization: during parsing of the callee we
3547 // generated at least one Goto to the continuation block. If we
3548 // generated exactly one, and if the inlined method spanned exactly
3549 // one block (and we didn't have to Goto its entry), then we snip
3550 // off the Goto to the continuation, allowing control to fall
3551 // through back into the caller block and effectively performing
3552 // block merging. This allows load elimination and CSE to take place
3553 // across multiple callee scopes if they are relatively simple, and
3554 // is currently essential to making inlining profitable.
3555 if ( num_returns() == 1
3556 && block() == orig_block
3557 && block() == inline_cleanup_block()) {
3558 _last = inline_cleanup_return_prev();
3559 _state = inline_cleanup_state();
3560 } else if (continuation_preds == cont->number_of_preds()) {
3561 // Inlining caused that the instructions after the invoke in the
3562 // caller are not reachable any more. So skip filling this block
3563 // with instructions!
3564 assert (cont == continuation(), "");
3565 assert(_last && _last->as_BlockEnd(), "");
3566 _skip_block = true;
3567 } else {
3568 // Resume parsing in continuation block unless it was already parsed.
3569 // Note that if we don't change _last here, iteration in
3570 // iterate_bytecodes_for_block will stop when we return.
3571 if (!continuation()->is_set(BlockBegin::was_visited_flag)) {
3572 // add continuation to work list instead of parsing it immediately
3573 assert(_last && _last->as_BlockEnd(), "");
3574 scope_data()->parent()->add_to_work_list(continuation());
3575 _skip_block = true;
3576 }
3577 }
3579 // Fill the exception handler for synchronized methods with instructions
3580 if (callee->is_synchronized() && sync_handler->state() != NULL) {
3581 fill_sync_handler(lock, sync_handler);
3582 } else {
3583 pop_scope();
3584 }
3586 compilation()->notice_inlined_method(callee);
3588 return true;
3589 }
3592 void GraphBuilder::inline_bailout(const char* msg) {
3593 assert(msg != NULL, "inline bailout msg must exist");
3594 _inline_bailout_msg = msg;
3595 }
3598 void GraphBuilder::clear_inline_bailout() {
3599 _inline_bailout_msg = NULL;
3600 }
3603 void GraphBuilder::push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start) {
3604 ScopeData* data = new ScopeData(NULL);
3605 data->set_scope(scope);
3606 data->set_bci2block(bci2block);
3607 _scope_data = data;
3608 _block = start;
3609 }
3612 void GraphBuilder::push_scope(ciMethod* callee, BlockBegin* continuation) {
3613 IRScope* callee_scope = new IRScope(compilation(), scope(), bci(), callee, -1, false);
3614 scope()->add_callee(callee_scope);
3616 BlockListBuilder blb(compilation(), callee_scope, -1);
3617 CHECK_BAILOUT();
3619 if (!blb.bci2block()->at(0)->is_set(BlockBegin::parser_loop_header_flag)) {
3620 // this scope can be inlined directly into the caller so remove
3621 // the block at bci 0.
3622 blb.bci2block()->at_put(0, NULL);
3623 }
3625 set_state(new ValueStack(callee_scope, state()->copy(ValueStack::CallerState, bci())));
3627 ScopeData* data = new ScopeData(scope_data());
3628 data->set_scope(callee_scope);
3629 data->set_bci2block(blb.bci2block());
3630 data->set_continuation(continuation);
3631 _scope_data = data;
3632 }
3635 void GraphBuilder::push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci) {
3636 ScopeData* data = new ScopeData(scope_data());
3637 data->set_parsing_jsr();
3638 data->set_jsr_entry_bci(jsr_dest_bci);
3639 data->set_jsr_return_address_local(-1);
3640 // Must clone bci2block list as we will be mutating it in order to
3641 // properly clone all blocks in jsr region as well as exception
3642 // handlers containing rets
3643 BlockList* new_bci2block = new BlockList(bci2block()->length());
3644 new_bci2block->push_all(bci2block());
3645 data->set_bci2block(new_bci2block);
3646 data->set_scope(scope());
3647 data->setup_jsr_xhandlers();
3648 data->set_continuation(continuation());
3649 data->set_jsr_continuation(jsr_continuation);
3650 _scope_data = data;
3651 }
3654 void GraphBuilder::pop_scope() {
3655 int number_of_locks = scope()->number_of_locks();
3656 _scope_data = scope_data()->parent();
3657 // accumulate minimum number of monitor slots to be reserved
3658 scope()->set_min_number_of_locks(number_of_locks);
3659 }
3662 void GraphBuilder::pop_scope_for_jsr() {
3663 _scope_data = scope_data()->parent();
3664 }
3666 bool GraphBuilder::append_unsafe_get_obj(ciMethod* callee, BasicType t, bool is_volatile) {
3667 if (InlineUnsafeOps) {
3668 Values* args = state()->pop_arguments(callee->arg_size());
3669 null_check(args->at(0));
3670 Instruction* offset = args->at(2);
3671 #ifndef _LP64
3672 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
3673 #endif
3674 Instruction* op = append(new UnsafeGetObject(t, args->at(1), offset, is_volatile));
3675 push(op->type(), op);
3676 compilation()->set_has_unsafe_access(true);
3677 }
3678 return InlineUnsafeOps;
3679 }
3682 bool GraphBuilder::append_unsafe_put_obj(ciMethod* callee, BasicType t, bool is_volatile) {
3683 if (InlineUnsafeOps) {
3684 Values* args = state()->pop_arguments(callee->arg_size());
3685 null_check(args->at(0));
3686 Instruction* offset = args->at(2);
3687 #ifndef _LP64
3688 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
3689 #endif
3690 Instruction* op = append(new UnsafePutObject(t, args->at(1), offset, args->at(3), is_volatile));
3691 compilation()->set_has_unsafe_access(true);
3692 kill_all();
3693 }
3694 return InlineUnsafeOps;
3695 }
3698 bool GraphBuilder::append_unsafe_get_raw(ciMethod* callee, BasicType t) {
3699 if (InlineUnsafeOps) {
3700 Values* args = state()->pop_arguments(callee->arg_size());
3701 null_check(args->at(0));
3702 Instruction* op = append(new UnsafeGetRaw(t, args->at(1), false));
3703 push(op->type(), op);
3704 compilation()->set_has_unsafe_access(true);
3705 }
3706 return InlineUnsafeOps;
3707 }
3710 bool GraphBuilder::append_unsafe_put_raw(ciMethod* callee, BasicType t) {
3711 if (InlineUnsafeOps) {
3712 Values* args = state()->pop_arguments(callee->arg_size());
3713 null_check(args->at(0));
3714 Instruction* op = append(new UnsafePutRaw(t, args->at(1), args->at(2)));
3715 compilation()->set_has_unsafe_access(true);
3716 }
3717 return InlineUnsafeOps;
3718 }
3721 bool GraphBuilder::append_unsafe_prefetch(ciMethod* callee, bool is_static, bool is_store) {
3722 if (InlineUnsafeOps) {
3723 Values* args = state()->pop_arguments(callee->arg_size());
3724 int obj_arg_index = 1; // Assume non-static case
3725 if (is_static) {
3726 obj_arg_index = 0;
3727 } else {
3728 null_check(args->at(0));
3729 }
3730 Instruction* offset = args->at(obj_arg_index + 1);
3731 #ifndef _LP64
3732 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
3733 #endif
3734 Instruction* op = is_store ? append(new UnsafePrefetchWrite(args->at(obj_arg_index), offset))
3735 : append(new UnsafePrefetchRead (args->at(obj_arg_index), offset));
3736 compilation()->set_has_unsafe_access(true);
3737 }
3738 return InlineUnsafeOps;
3739 }
3742 void GraphBuilder::append_unsafe_CAS(ciMethod* callee) {
3743 ValueStack* state_before = copy_state_for_exception();
3744 ValueType* result_type = as_ValueType(callee->return_type());
3745 assert(result_type->is_int(), "int result");
3746 Values* args = state()->pop_arguments(callee->arg_size());
3748 // Pop off some args to speically handle, then push back
3749 Value newval = args->pop();
3750 Value cmpval = args->pop();
3751 Value offset = args->pop();
3752 Value src = args->pop();
3753 Value unsafe_obj = args->pop();
3755 // Separately handle the unsafe arg. It is not needed for code
3756 // generation, but must be null checked
3757 null_check(unsafe_obj);
3759 #ifndef _LP64
3760 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
3761 #endif
3763 args->push(src);
3764 args->push(offset);
3765 args->push(cmpval);
3766 args->push(newval);
3768 // An unsafe CAS can alias with other field accesses, but we don't
3769 // know which ones so mark the state as no preserved. This will
3770 // cause CSE to invalidate memory across it.
3771 bool preserves_state = false;
3772 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), args, false, state_before, preserves_state);
3773 append_split(result);
3774 push(result_type, result);
3775 compilation()->set_has_unsafe_access(true);
3776 }
3779 #ifndef PRODUCT
3780 void GraphBuilder::print_inline_result(ciMethod* callee, bool res) {
3781 const char sync_char = callee->is_synchronized() ? 's' : ' ';
3782 const char exception_char = callee->has_exception_handlers() ? '!' : ' ';
3783 const char monitors_char = callee->has_monitor_bytecodes() ? 'm' : ' ';
3784 tty->print(" %c%c%c ", sync_char, exception_char, monitors_char);
3785 for (int i = 0; i < scope()->level(); i++) tty->print(" ");
3786 if (res) {
3787 tty->print(" ");
3788 } else {
3789 tty->print("- ");
3790 }
3791 tty->print("@ %d ", bci());
3792 callee->print_short_name();
3793 tty->print(" (%d bytes)", callee->code_size());
3794 if (_inline_bailout_msg) {
3795 tty->print(" %s", _inline_bailout_msg);
3796 }
3797 tty->cr();
3799 if (res && CIPrintMethodCodes) {
3800 callee->print_codes();
3801 }
3802 }
3805 void GraphBuilder::print_stats() {
3806 vmap()->print();
3807 }
3808 #endif // PRODUCT
3810 void GraphBuilder::profile_call(Value recv, ciKlass* known_holder) {
3811 append(new ProfileCall(method(), bci(), recv, known_holder));
3812 }
3814 void GraphBuilder::profile_invocation(ciMethod* callee, ValueStack* state) {
3815 append(new ProfileInvoke(callee, state));
3816 }