Fri, 02 Mar 2012 16:04:24 +0100
6910464: Lookupswitch and Tableswitch default branches not recognized as safepoints
Summary: C1 does not recognize the default branch of a lookupswitch or tableswitch bytecode to be a safepoint if backward.
Reviewed-by: kvn, never
1 /*
2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "c1/c1_CFGPrinter.hpp"
27 #include "c1/c1_Canonicalizer.hpp"
28 #include "c1/c1_Compilation.hpp"
29 #include "c1/c1_GraphBuilder.hpp"
30 #include "c1/c1_InstructionPrinter.hpp"
31 #include "ci/ciCallSite.hpp"
32 #include "ci/ciField.hpp"
33 #include "ci/ciKlass.hpp"
34 #include "ci/ciMethodHandle.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "interpreter/bytecode.hpp"
37 #include "runtime/sharedRuntime.hpp"
38 #include "runtime/compilationPolicy.hpp"
39 #include "utilities/bitMap.inline.hpp"
41 class BlockListBuilder VALUE_OBJ_CLASS_SPEC {
42 private:
43 Compilation* _compilation;
44 IRScope* _scope;
46 BlockList _blocks; // internal list of all blocks
47 BlockList* _bci2block; // mapping from bci to blocks for GraphBuilder
49 // fields used by mark_loops
50 BitMap _active; // for iteration of control flow graph
51 BitMap _visited; // for iteration of control flow graph
52 intArray _loop_map; // caches the information if a block is contained in a loop
53 int _next_loop_index; // next free loop number
54 int _next_block_number; // for reverse postorder numbering of blocks
56 // accessors
57 Compilation* compilation() const { return _compilation; }
58 IRScope* scope() const { return _scope; }
59 ciMethod* method() const { return scope()->method(); }
60 XHandlers* xhandlers() const { return scope()->xhandlers(); }
62 // unified bailout support
63 void bailout(const char* msg) const { compilation()->bailout(msg); }
64 bool bailed_out() const { return compilation()->bailed_out(); }
66 // helper functions
67 BlockBegin* make_block_at(int bci, BlockBegin* predecessor);
68 void handle_exceptions(BlockBegin* current, int cur_bci);
69 void handle_jsr(BlockBegin* current, int sr_bci, int next_bci);
70 void store_one(BlockBegin* current, int local);
71 void store_two(BlockBegin* current, int local);
72 void set_entries(int osr_bci);
73 void set_leaders();
75 void make_loop_header(BlockBegin* block);
76 void mark_loops();
77 int mark_loops(BlockBegin* b, bool in_subroutine);
79 // debugging
80 #ifndef PRODUCT
81 void print();
82 #endif
84 public:
85 // creation
86 BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci);
88 // accessors for GraphBuilder
89 BlockList* bci2block() const { return _bci2block; }
90 };
93 // Implementation of BlockListBuilder
95 BlockListBuilder::BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci)
96 : _compilation(compilation)
97 , _scope(scope)
98 , _blocks(16)
99 , _bci2block(new BlockList(scope->method()->code_size(), NULL))
100 , _next_block_number(0)
101 , _active() // size not known yet
102 , _visited() // size not known yet
103 , _next_loop_index(0)
104 , _loop_map() // size not known yet
105 {
106 set_entries(osr_bci);
107 set_leaders();
108 CHECK_BAILOUT();
110 mark_loops();
111 NOT_PRODUCT(if (PrintInitialBlockList) print());
113 #ifndef PRODUCT
114 if (PrintCFGToFile) {
115 stringStream title;
116 title.print("BlockListBuilder ");
117 scope->method()->print_name(&title);
118 CFGPrinter::print_cfg(_bci2block, title.as_string(), false, false);
119 }
120 #endif
121 }
124 void BlockListBuilder::set_entries(int osr_bci) {
125 // generate start blocks
126 BlockBegin* std_entry = make_block_at(0, NULL);
127 if (scope()->caller() == NULL) {
128 std_entry->set(BlockBegin::std_entry_flag);
129 }
130 if (osr_bci != -1) {
131 BlockBegin* osr_entry = make_block_at(osr_bci, NULL);
132 osr_entry->set(BlockBegin::osr_entry_flag);
133 }
135 // generate exception entry blocks
136 XHandlers* list = xhandlers();
137 const int n = list->length();
138 for (int i = 0; i < n; i++) {
139 XHandler* h = list->handler_at(i);
140 BlockBegin* entry = make_block_at(h->handler_bci(), NULL);
141 entry->set(BlockBegin::exception_entry_flag);
142 h->set_entry_block(entry);
143 }
144 }
147 BlockBegin* BlockListBuilder::make_block_at(int cur_bci, BlockBegin* predecessor) {
148 assert(method()->bci_block_start().at(cur_bci), "wrong block starts of MethodLivenessAnalyzer");
150 BlockBegin* block = _bci2block->at(cur_bci);
151 if (block == NULL) {
152 block = new BlockBegin(cur_bci);
153 block->init_stores_to_locals(method()->max_locals());
154 _bci2block->at_put(cur_bci, block);
155 _blocks.append(block);
157 assert(predecessor == NULL || predecessor->bci() < cur_bci, "targets for backward branches must already exist");
158 }
160 if (predecessor != NULL) {
161 if (block->is_set(BlockBegin::exception_entry_flag)) {
162 BAILOUT_("Exception handler can be reached by both normal and exceptional control flow", block);
163 }
165 predecessor->add_successor(block);
166 block->increment_total_preds();
167 }
169 return block;
170 }
173 inline void BlockListBuilder::store_one(BlockBegin* current, int local) {
174 current->stores_to_locals().set_bit(local);
175 }
176 inline void BlockListBuilder::store_two(BlockBegin* current, int local) {
177 store_one(current, local);
178 store_one(current, local + 1);
179 }
182 void BlockListBuilder::handle_exceptions(BlockBegin* current, int cur_bci) {
183 // Draws edges from a block to its exception handlers
184 XHandlers* list = xhandlers();
185 const int n = list->length();
187 for (int i = 0; i < n; i++) {
188 XHandler* h = list->handler_at(i);
190 if (h->covers(cur_bci)) {
191 BlockBegin* entry = h->entry_block();
192 assert(entry != NULL && entry == _bci2block->at(h->handler_bci()), "entry must be set");
193 assert(entry->is_set(BlockBegin::exception_entry_flag), "flag must be set");
195 // add each exception handler only once
196 if (!current->is_successor(entry)) {
197 current->add_successor(entry);
198 entry->increment_total_preds();
199 }
201 // stop when reaching catchall
202 if (h->catch_type() == 0) break;
203 }
204 }
205 }
207 void BlockListBuilder::handle_jsr(BlockBegin* current, int sr_bci, int next_bci) {
208 // start a new block after jsr-bytecode and link this block into cfg
209 make_block_at(next_bci, current);
211 // start a new block at the subroutine entry at mark it with special flag
212 BlockBegin* sr_block = make_block_at(sr_bci, current);
213 if (!sr_block->is_set(BlockBegin::subroutine_entry_flag)) {
214 sr_block->set(BlockBegin::subroutine_entry_flag);
215 }
216 }
219 void BlockListBuilder::set_leaders() {
220 bool has_xhandlers = xhandlers()->has_handlers();
221 BlockBegin* current = NULL;
223 // The information which bci starts a new block simplifies the analysis
224 // Without it, backward branches could jump to a bci where no block was created
225 // during bytecode iteration. This would require the creation of a new block at the
226 // branch target and a modification of the successor lists.
227 BitMap bci_block_start = method()->bci_block_start();
229 ciBytecodeStream s(method());
230 while (s.next() != ciBytecodeStream::EOBC()) {
231 int cur_bci = s.cur_bci();
233 if (bci_block_start.at(cur_bci)) {
234 current = make_block_at(cur_bci, current);
235 }
236 assert(current != NULL, "must have current block");
238 if (has_xhandlers && GraphBuilder::can_trap(method(), s.cur_bc())) {
239 handle_exceptions(current, cur_bci);
240 }
242 switch (s.cur_bc()) {
243 // track stores to local variables for selective creation of phi functions
244 case Bytecodes::_iinc: store_one(current, s.get_index()); break;
245 case Bytecodes::_istore: store_one(current, s.get_index()); break;
246 case Bytecodes::_lstore: store_two(current, s.get_index()); break;
247 case Bytecodes::_fstore: store_one(current, s.get_index()); break;
248 case Bytecodes::_dstore: store_two(current, s.get_index()); break;
249 case Bytecodes::_astore: store_one(current, s.get_index()); break;
250 case Bytecodes::_istore_0: store_one(current, 0); break;
251 case Bytecodes::_istore_1: store_one(current, 1); break;
252 case Bytecodes::_istore_2: store_one(current, 2); break;
253 case Bytecodes::_istore_3: store_one(current, 3); break;
254 case Bytecodes::_lstore_0: store_two(current, 0); break;
255 case Bytecodes::_lstore_1: store_two(current, 1); break;
256 case Bytecodes::_lstore_2: store_two(current, 2); break;
257 case Bytecodes::_lstore_3: store_two(current, 3); break;
258 case Bytecodes::_fstore_0: store_one(current, 0); break;
259 case Bytecodes::_fstore_1: store_one(current, 1); break;
260 case Bytecodes::_fstore_2: store_one(current, 2); break;
261 case Bytecodes::_fstore_3: store_one(current, 3); break;
262 case Bytecodes::_dstore_0: store_two(current, 0); break;
263 case Bytecodes::_dstore_1: store_two(current, 1); break;
264 case Bytecodes::_dstore_2: store_two(current, 2); break;
265 case Bytecodes::_dstore_3: store_two(current, 3); break;
266 case Bytecodes::_astore_0: store_one(current, 0); break;
267 case Bytecodes::_astore_1: store_one(current, 1); break;
268 case Bytecodes::_astore_2: store_one(current, 2); break;
269 case Bytecodes::_astore_3: store_one(current, 3); break;
271 // track bytecodes that affect the control flow
272 case Bytecodes::_athrow: // fall through
273 case Bytecodes::_ret: // fall through
274 case Bytecodes::_ireturn: // fall through
275 case Bytecodes::_lreturn: // fall through
276 case Bytecodes::_freturn: // fall through
277 case Bytecodes::_dreturn: // fall through
278 case Bytecodes::_areturn: // fall through
279 case Bytecodes::_return:
280 current = NULL;
281 break;
283 case Bytecodes::_ifeq: // fall through
284 case Bytecodes::_ifne: // fall through
285 case Bytecodes::_iflt: // fall through
286 case Bytecodes::_ifge: // fall through
287 case Bytecodes::_ifgt: // fall through
288 case Bytecodes::_ifle: // fall through
289 case Bytecodes::_if_icmpeq: // fall through
290 case Bytecodes::_if_icmpne: // fall through
291 case Bytecodes::_if_icmplt: // fall through
292 case Bytecodes::_if_icmpge: // fall through
293 case Bytecodes::_if_icmpgt: // fall through
294 case Bytecodes::_if_icmple: // fall through
295 case Bytecodes::_if_acmpeq: // fall through
296 case Bytecodes::_if_acmpne: // fall through
297 case Bytecodes::_ifnull: // fall through
298 case Bytecodes::_ifnonnull:
299 make_block_at(s.next_bci(), current);
300 make_block_at(s.get_dest(), current);
301 current = NULL;
302 break;
304 case Bytecodes::_goto:
305 make_block_at(s.get_dest(), current);
306 current = NULL;
307 break;
309 case Bytecodes::_goto_w:
310 make_block_at(s.get_far_dest(), current);
311 current = NULL;
312 break;
314 case Bytecodes::_jsr:
315 handle_jsr(current, s.get_dest(), s.next_bci());
316 current = NULL;
317 break;
319 case Bytecodes::_jsr_w:
320 handle_jsr(current, s.get_far_dest(), s.next_bci());
321 current = NULL;
322 break;
324 case Bytecodes::_tableswitch: {
325 // set block for each case
326 Bytecode_tableswitch sw(&s);
327 int l = sw.length();
328 for (int i = 0; i < l; i++) {
329 make_block_at(cur_bci + sw.dest_offset_at(i), current);
330 }
331 make_block_at(cur_bci + sw.default_offset(), current);
332 current = NULL;
333 break;
334 }
336 case Bytecodes::_lookupswitch: {
337 // set block for each case
338 Bytecode_lookupswitch sw(&s);
339 int l = sw.number_of_pairs();
340 for (int i = 0; i < l; i++) {
341 make_block_at(cur_bci + sw.pair_at(i).offset(), current);
342 }
343 make_block_at(cur_bci + sw.default_offset(), current);
344 current = NULL;
345 break;
346 }
347 }
348 }
349 }
352 void BlockListBuilder::mark_loops() {
353 ResourceMark rm;
355 _active = BitMap(BlockBegin::number_of_blocks()); _active.clear();
356 _visited = BitMap(BlockBegin::number_of_blocks()); _visited.clear();
357 _loop_map = intArray(BlockBegin::number_of_blocks(), 0);
358 _next_loop_index = 0;
359 _next_block_number = _blocks.length();
361 // recursively iterate the control flow graph
362 mark_loops(_bci2block->at(0), false);
363 assert(_next_block_number >= 0, "invalid block numbers");
364 }
366 void BlockListBuilder::make_loop_header(BlockBegin* block) {
367 if (block->is_set(BlockBegin::exception_entry_flag)) {
368 // exception edges may look like loops but don't mark them as such
369 // since it screws up block ordering.
370 return;
371 }
372 if (!block->is_set(BlockBegin::parser_loop_header_flag)) {
373 block->set(BlockBegin::parser_loop_header_flag);
375 assert(_loop_map.at(block->block_id()) == 0, "must not be set yet");
376 assert(0 <= _next_loop_index && _next_loop_index < BitsPerInt, "_next_loop_index is used as a bit-index in integer");
377 _loop_map.at_put(block->block_id(), 1 << _next_loop_index);
378 if (_next_loop_index < 31) _next_loop_index++;
379 } else {
380 // block already marked as loop header
381 assert(is_power_of_2((unsigned int)_loop_map.at(block->block_id())), "exactly one bit must be set");
382 }
383 }
385 int BlockListBuilder::mark_loops(BlockBegin* block, bool in_subroutine) {
386 int block_id = block->block_id();
388 if (_visited.at(block_id)) {
389 if (_active.at(block_id)) {
390 // reached block via backward branch
391 make_loop_header(block);
392 }
393 // return cached loop information for this block
394 return _loop_map.at(block_id);
395 }
397 if (block->is_set(BlockBegin::subroutine_entry_flag)) {
398 in_subroutine = true;
399 }
401 // set active and visited bits before successors are processed
402 _visited.set_bit(block_id);
403 _active.set_bit(block_id);
405 intptr_t loop_state = 0;
406 for (int i = block->number_of_sux() - 1; i >= 0; i--) {
407 // recursively process all successors
408 loop_state |= mark_loops(block->sux_at(i), in_subroutine);
409 }
411 // clear active-bit after all successors are processed
412 _active.clear_bit(block_id);
414 // reverse-post-order numbering of all blocks
415 block->set_depth_first_number(_next_block_number);
416 _next_block_number--;
418 if (loop_state != 0 || in_subroutine ) {
419 // block is contained at least in one loop, so phi functions are necessary
420 // phi functions are also necessary for all locals stored in a subroutine
421 scope()->requires_phi_function().set_union(block->stores_to_locals());
422 }
424 if (block->is_set(BlockBegin::parser_loop_header_flag)) {
425 int header_loop_state = _loop_map.at(block_id);
426 assert(is_power_of_2((unsigned)header_loop_state), "exactly one bit must be set");
428 // If the highest bit is set (i.e. when integer value is negative), the method
429 // has 32 or more loops. This bit is never cleared because it is used for multiple loops
430 if (header_loop_state >= 0) {
431 clear_bits(loop_state, header_loop_state);
432 }
433 }
435 // cache and return loop information for this block
436 _loop_map.at_put(block_id, loop_state);
437 return loop_state;
438 }
441 #ifndef PRODUCT
443 int compare_depth_first(BlockBegin** a, BlockBegin** b) {
444 return (*a)->depth_first_number() - (*b)->depth_first_number();
445 }
447 void BlockListBuilder::print() {
448 tty->print("----- initial block list of BlockListBuilder for method ");
449 method()->print_short_name();
450 tty->cr();
452 // better readability if blocks are sorted in processing order
453 _blocks.sort(compare_depth_first);
455 for (int i = 0; i < _blocks.length(); i++) {
456 BlockBegin* cur = _blocks.at(i);
457 tty->print("%4d: B%-4d bci: %-4d preds: %-4d ", cur->depth_first_number(), cur->block_id(), cur->bci(), cur->total_preds());
459 tty->print(cur->is_set(BlockBegin::std_entry_flag) ? " std" : " ");
460 tty->print(cur->is_set(BlockBegin::osr_entry_flag) ? " osr" : " ");
461 tty->print(cur->is_set(BlockBegin::exception_entry_flag) ? " ex" : " ");
462 tty->print(cur->is_set(BlockBegin::subroutine_entry_flag) ? " sr" : " ");
463 tty->print(cur->is_set(BlockBegin::parser_loop_header_flag) ? " lh" : " ");
465 if (cur->number_of_sux() > 0) {
466 tty->print(" sux: ");
467 for (int j = 0; j < cur->number_of_sux(); j++) {
468 BlockBegin* sux = cur->sux_at(j);
469 tty->print("B%d ", sux->block_id());
470 }
471 }
472 tty->cr();
473 }
474 }
476 #endif
479 // A simple growable array of Values indexed by ciFields
480 class FieldBuffer: public CompilationResourceObj {
481 private:
482 GrowableArray<Value> _values;
484 public:
485 FieldBuffer() {}
487 void kill() {
488 _values.trunc_to(0);
489 }
491 Value at(ciField* field) {
492 assert(field->holder()->is_loaded(), "must be a loaded field");
493 int offset = field->offset();
494 if (offset < _values.length()) {
495 return _values.at(offset);
496 } else {
497 return NULL;
498 }
499 }
501 void at_put(ciField* field, Value value) {
502 assert(field->holder()->is_loaded(), "must be a loaded field");
503 int offset = field->offset();
504 _values.at_put_grow(offset, value, NULL);
505 }
507 };
510 // MemoryBuffer is fairly simple model of the current state of memory.
511 // It partitions memory into several pieces. The first piece is
512 // generic memory where little is known about the owner of the memory.
513 // This is conceptually represented by the tuple <O, F, V> which says
514 // that the field F of object O has value V. This is flattened so
515 // that F is represented by the offset of the field and the parallel
516 // arrays _objects and _values are used for O and V. Loads of O.F can
517 // simply use V. Newly allocated objects are kept in a separate list
518 // along with a parallel array for each object which represents the
519 // current value of its fields. Stores of the default value to fields
520 // which have never been stored to before are eliminated since they
521 // are redundant. Once newly allocated objects are stored into
522 // another object or they are passed out of the current compile they
523 // are treated like generic memory.
525 class MemoryBuffer: public CompilationResourceObj {
526 private:
527 FieldBuffer _values;
528 GrowableArray<Value> _objects;
529 GrowableArray<Value> _newobjects;
530 GrowableArray<FieldBuffer*> _fields;
532 public:
533 MemoryBuffer() {}
535 StoreField* store(StoreField* st) {
536 if (!EliminateFieldAccess) {
537 return st;
538 }
540 Value object = st->obj();
541 Value value = st->value();
542 ciField* field = st->field();
543 if (field->holder()->is_loaded()) {
544 int offset = field->offset();
545 int index = _newobjects.find(object);
546 if (index != -1) {
547 // newly allocated object with no other stores performed on this field
548 FieldBuffer* buf = _fields.at(index);
549 if (buf->at(field) == NULL && is_default_value(value)) {
550 #ifndef PRODUCT
551 if (PrintIRDuringConstruction && Verbose) {
552 tty->print_cr("Eliminated store for object %d:", index);
553 st->print_line();
554 }
555 #endif
556 return NULL;
557 } else {
558 buf->at_put(field, value);
559 }
560 } else {
561 _objects.at_put_grow(offset, object, NULL);
562 _values.at_put(field, value);
563 }
565 store_value(value);
566 } else {
567 // if we held onto field names we could alias based on names but
568 // we don't know what's being stored to so kill it all.
569 kill();
570 }
571 return st;
572 }
575 // return true if this value correspond to the default value of a field.
576 bool is_default_value(Value value) {
577 Constant* con = value->as_Constant();
578 if (con) {
579 switch (con->type()->tag()) {
580 case intTag: return con->type()->as_IntConstant()->value() == 0;
581 case longTag: return con->type()->as_LongConstant()->value() == 0;
582 case floatTag: return jint_cast(con->type()->as_FloatConstant()->value()) == 0;
583 case doubleTag: return jlong_cast(con->type()->as_DoubleConstant()->value()) == jlong_cast(0);
584 case objectTag: return con->type() == objectNull;
585 default: ShouldNotReachHere();
586 }
587 }
588 return false;
589 }
592 // return either the actual value of a load or the load itself
593 Value load(LoadField* load) {
594 if (!EliminateFieldAccess) {
595 return load;
596 }
598 if (RoundFPResults && UseSSE < 2 && load->type()->is_float_kind()) {
599 // can't skip load since value might get rounded as a side effect
600 return load;
601 }
603 ciField* field = load->field();
604 Value object = load->obj();
605 if (field->holder()->is_loaded() && !field->is_volatile()) {
606 int offset = field->offset();
607 Value result = NULL;
608 int index = _newobjects.find(object);
609 if (index != -1) {
610 result = _fields.at(index)->at(field);
611 } else if (_objects.at_grow(offset, NULL) == object) {
612 result = _values.at(field);
613 }
614 if (result != NULL) {
615 #ifndef PRODUCT
616 if (PrintIRDuringConstruction && Verbose) {
617 tty->print_cr("Eliminated load: ");
618 load->print_line();
619 }
620 #endif
621 assert(result->type()->tag() == load->type()->tag(), "wrong types");
622 return result;
623 }
624 }
625 return load;
626 }
628 // Record this newly allocated object
629 void new_instance(NewInstance* object) {
630 int index = _newobjects.length();
631 _newobjects.append(object);
632 if (_fields.at_grow(index, NULL) == NULL) {
633 _fields.at_put(index, new FieldBuffer());
634 } else {
635 _fields.at(index)->kill();
636 }
637 }
639 void store_value(Value value) {
640 int index = _newobjects.find(value);
641 if (index != -1) {
642 // stored a newly allocated object into another object.
643 // Assume we've lost track of it as separate slice of memory.
644 // We could do better by keeping track of whether individual
645 // fields could alias each other.
646 _newobjects.remove_at(index);
647 // pull out the field info and store it at the end up the list
648 // of field info list to be reused later.
649 _fields.append(_fields.at(index));
650 _fields.remove_at(index);
651 }
652 }
654 void kill() {
655 _newobjects.trunc_to(0);
656 _objects.trunc_to(0);
657 _values.kill();
658 }
659 };
662 // Implementation of GraphBuilder's ScopeData
664 GraphBuilder::ScopeData::ScopeData(ScopeData* parent)
665 : _parent(parent)
666 , _bci2block(NULL)
667 , _scope(NULL)
668 , _has_handler(false)
669 , _stream(NULL)
670 , _work_list(NULL)
671 , _parsing_jsr(false)
672 , _jsr_xhandlers(NULL)
673 , _caller_stack_size(-1)
674 , _continuation(NULL)
675 , _num_returns(0)
676 , _cleanup_block(NULL)
677 , _cleanup_return_prev(NULL)
678 , _cleanup_state(NULL)
679 {
680 if (parent != NULL) {
681 _max_inline_size = (intx) ((float) NestedInliningSizeRatio * (float) parent->max_inline_size() / 100.0f);
682 } else {
683 _max_inline_size = MaxInlineSize;
684 }
685 if (_max_inline_size < MaxTrivialSize) {
686 _max_inline_size = MaxTrivialSize;
687 }
688 }
691 void GraphBuilder::kill_all() {
692 if (UseLocalValueNumbering) {
693 vmap()->kill_all();
694 }
695 _memory->kill();
696 }
699 BlockBegin* GraphBuilder::ScopeData::block_at(int bci) {
700 if (parsing_jsr()) {
701 // It is necessary to clone all blocks associated with a
702 // subroutine, including those for exception handlers in the scope
703 // of the method containing the jsr (because those exception
704 // handlers may contain ret instructions in some cases).
705 BlockBegin* block = bci2block()->at(bci);
706 if (block != NULL && block == parent()->bci2block()->at(bci)) {
707 BlockBegin* new_block = new BlockBegin(block->bci());
708 #ifndef PRODUCT
709 if (PrintInitialBlockList) {
710 tty->print_cr("CFG: cloned block %d (bci %d) as block %d for jsr",
711 block->block_id(), block->bci(), new_block->block_id());
712 }
713 #endif
714 // copy data from cloned blocked
715 new_block->set_depth_first_number(block->depth_first_number());
716 if (block->is_set(BlockBegin::parser_loop_header_flag)) new_block->set(BlockBegin::parser_loop_header_flag);
717 // Preserve certain flags for assertion checking
718 if (block->is_set(BlockBegin::subroutine_entry_flag)) new_block->set(BlockBegin::subroutine_entry_flag);
719 if (block->is_set(BlockBegin::exception_entry_flag)) new_block->set(BlockBegin::exception_entry_flag);
721 // copy was_visited_flag to allow early detection of bailouts
722 // if a block that is used in a jsr has already been visited before,
723 // it is shared between the normal control flow and a subroutine
724 // BlockBegin::try_merge returns false when the flag is set, this leads
725 // to a compilation bailout
726 if (block->is_set(BlockBegin::was_visited_flag)) new_block->set(BlockBegin::was_visited_flag);
728 bci2block()->at_put(bci, new_block);
729 block = new_block;
730 }
731 return block;
732 } else {
733 return bci2block()->at(bci);
734 }
735 }
738 XHandlers* GraphBuilder::ScopeData::xhandlers() const {
739 if (_jsr_xhandlers == NULL) {
740 assert(!parsing_jsr(), "");
741 return scope()->xhandlers();
742 }
743 assert(parsing_jsr(), "");
744 return _jsr_xhandlers;
745 }
748 void GraphBuilder::ScopeData::set_scope(IRScope* scope) {
749 _scope = scope;
750 bool parent_has_handler = false;
751 if (parent() != NULL) {
752 parent_has_handler = parent()->has_handler();
753 }
754 _has_handler = parent_has_handler || scope->xhandlers()->has_handlers();
755 }
758 void GraphBuilder::ScopeData::set_inline_cleanup_info(BlockBegin* block,
759 Instruction* return_prev,
760 ValueStack* return_state) {
761 _cleanup_block = block;
762 _cleanup_return_prev = return_prev;
763 _cleanup_state = return_state;
764 }
767 void GraphBuilder::ScopeData::add_to_work_list(BlockBegin* block) {
768 if (_work_list == NULL) {
769 _work_list = new BlockList();
770 }
772 if (!block->is_set(BlockBegin::is_on_work_list_flag)) {
773 // Do not start parsing the continuation block while in a
774 // sub-scope
775 if (parsing_jsr()) {
776 if (block == jsr_continuation()) {
777 return;
778 }
779 } else {
780 if (block == continuation()) {
781 return;
782 }
783 }
784 block->set(BlockBegin::is_on_work_list_flag);
785 _work_list->push(block);
787 sort_top_into_worklist(_work_list, block);
788 }
789 }
792 void GraphBuilder::sort_top_into_worklist(BlockList* worklist, BlockBegin* top) {
793 assert(worklist->top() == top, "");
794 // sort block descending into work list
795 const int dfn = top->depth_first_number();
796 assert(dfn != -1, "unknown depth first number");
797 int i = worklist->length()-2;
798 while (i >= 0) {
799 BlockBegin* b = worklist->at(i);
800 if (b->depth_first_number() < dfn) {
801 worklist->at_put(i+1, b);
802 } else {
803 break;
804 }
805 i --;
806 }
807 if (i >= -1) worklist->at_put(i + 1, top);
808 }
811 BlockBegin* GraphBuilder::ScopeData::remove_from_work_list() {
812 if (is_work_list_empty()) {
813 return NULL;
814 }
815 return _work_list->pop();
816 }
819 bool GraphBuilder::ScopeData::is_work_list_empty() const {
820 return (_work_list == NULL || _work_list->length() == 0);
821 }
824 void GraphBuilder::ScopeData::setup_jsr_xhandlers() {
825 assert(parsing_jsr(), "");
826 // clone all the exception handlers from the scope
827 XHandlers* handlers = new XHandlers(scope()->xhandlers());
828 const int n = handlers->length();
829 for (int i = 0; i < n; i++) {
830 // The XHandlers need to be adjusted to dispatch to the cloned
831 // handler block instead of the default one but the synthetic
832 // unlocker needs to be handled specially. The synthetic unlocker
833 // should be left alone since there can be only one and all code
834 // should dispatch to the same one.
835 XHandler* h = handlers->handler_at(i);
836 assert(h->handler_bci() != SynchronizationEntryBCI, "must be real");
837 h->set_entry_block(block_at(h->handler_bci()));
838 }
839 _jsr_xhandlers = handlers;
840 }
843 int GraphBuilder::ScopeData::num_returns() {
844 if (parsing_jsr()) {
845 return parent()->num_returns();
846 }
847 return _num_returns;
848 }
851 void GraphBuilder::ScopeData::incr_num_returns() {
852 if (parsing_jsr()) {
853 parent()->incr_num_returns();
854 } else {
855 ++_num_returns;
856 }
857 }
860 // Implementation of GraphBuilder
862 #define INLINE_BAILOUT(msg) { inline_bailout(msg); return false; }
865 void GraphBuilder::load_constant() {
866 ciConstant con = stream()->get_constant();
867 if (con.basic_type() == T_ILLEGAL) {
868 BAILOUT("could not resolve a constant");
869 } else {
870 ValueType* t = illegalType;
871 ValueStack* patch_state = NULL;
872 switch (con.basic_type()) {
873 case T_BOOLEAN: t = new IntConstant (con.as_boolean()); break;
874 case T_BYTE : t = new IntConstant (con.as_byte ()); break;
875 case T_CHAR : t = new IntConstant (con.as_char ()); break;
876 case T_SHORT : t = new IntConstant (con.as_short ()); break;
877 case T_INT : t = new IntConstant (con.as_int ()); break;
878 case T_LONG : t = new LongConstant (con.as_long ()); break;
879 case T_FLOAT : t = new FloatConstant (con.as_float ()); break;
880 case T_DOUBLE : t = new DoubleConstant (con.as_double ()); break;
881 case T_ARRAY : t = new ArrayConstant (con.as_object ()->as_array ()); break;
882 case T_OBJECT :
883 {
884 ciObject* obj = con.as_object();
885 if (!obj->is_loaded()
886 || (PatchALot && obj->klass() != ciEnv::current()->String_klass())) {
887 patch_state = copy_state_before();
888 t = new ObjectConstant(obj);
889 } else {
890 assert(!obj->is_klass(), "must be java_mirror of klass");
891 t = new InstanceConstant(obj->as_instance());
892 }
893 break;
894 }
895 default : ShouldNotReachHere();
896 }
897 Value x;
898 if (patch_state != NULL) {
899 x = new Constant(t, patch_state);
900 } else {
901 x = new Constant(t);
902 }
903 push(t, append(x));
904 }
905 }
908 void GraphBuilder::load_local(ValueType* type, int index) {
909 Value x = state()->local_at(index);
910 assert(x != NULL && !x->type()->is_illegal(), "access of illegal local variable");
911 push(type, x);
912 }
915 void GraphBuilder::store_local(ValueType* type, int index) {
916 Value x = pop(type);
917 store_local(state(), x, type, index);
918 }
921 void GraphBuilder::store_local(ValueStack* state, Value x, ValueType* type, int index) {
922 if (parsing_jsr()) {
923 // We need to do additional tracking of the location of the return
924 // address for jsrs since we don't handle arbitrary jsr/ret
925 // constructs. Here we are figuring out in which circumstances we
926 // need to bail out.
927 if (x->type()->is_address()) {
928 scope_data()->set_jsr_return_address_local(index);
930 // Also check parent jsrs (if any) at this time to see whether
931 // they are using this local. We don't handle skipping over a
932 // ret.
933 for (ScopeData* cur_scope_data = scope_data()->parent();
934 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
935 cur_scope_data = cur_scope_data->parent()) {
936 if (cur_scope_data->jsr_return_address_local() == index) {
937 BAILOUT("subroutine overwrites return address from previous subroutine");
938 }
939 }
940 } else if (index == scope_data()->jsr_return_address_local()) {
941 scope_data()->set_jsr_return_address_local(-1);
942 }
943 }
945 state->store_local(index, round_fp(x));
946 }
949 void GraphBuilder::load_indexed(BasicType type) {
950 ValueStack* state_before = copy_state_for_exception();
951 Value index = ipop();
952 Value array = apop();
953 Value length = NULL;
954 if (CSEArrayLength ||
955 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
956 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) {
957 length = append(new ArrayLength(array, state_before));
958 }
959 push(as_ValueType(type), append(new LoadIndexed(array, index, length, type, state_before)));
960 }
963 void GraphBuilder::store_indexed(BasicType type) {
964 ValueStack* state_before = copy_state_for_exception();
965 Value value = pop(as_ValueType(type));
966 Value index = ipop();
967 Value array = apop();
968 Value length = NULL;
969 if (CSEArrayLength ||
970 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
971 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) {
972 length = append(new ArrayLength(array, state_before));
973 }
974 StoreIndexed* result = new StoreIndexed(array, index, length, type, value, state_before);
975 append(result);
976 _memory->store_value(value);
978 if (type == T_OBJECT && is_profiling()) {
979 // Note that we'd collect profile data in this method if we wanted it.
980 compilation()->set_would_profile(true);
982 if (profile_checkcasts()) {
983 result->set_profiled_method(method());
984 result->set_profiled_bci(bci());
985 result->set_should_profile(true);
986 }
987 }
988 }
991 void GraphBuilder::stack_op(Bytecodes::Code code) {
992 switch (code) {
993 case Bytecodes::_pop:
994 { state()->raw_pop();
995 }
996 break;
997 case Bytecodes::_pop2:
998 { state()->raw_pop();
999 state()->raw_pop();
1000 }
1001 break;
1002 case Bytecodes::_dup:
1003 { Value w = state()->raw_pop();
1004 state()->raw_push(w);
1005 state()->raw_push(w);
1006 }
1007 break;
1008 case Bytecodes::_dup_x1:
1009 { Value w1 = state()->raw_pop();
1010 Value w2 = state()->raw_pop();
1011 state()->raw_push(w1);
1012 state()->raw_push(w2);
1013 state()->raw_push(w1);
1014 }
1015 break;
1016 case Bytecodes::_dup_x2:
1017 { Value w1 = state()->raw_pop();
1018 Value w2 = state()->raw_pop();
1019 Value w3 = state()->raw_pop();
1020 state()->raw_push(w1);
1021 state()->raw_push(w3);
1022 state()->raw_push(w2);
1023 state()->raw_push(w1);
1024 }
1025 break;
1026 case Bytecodes::_dup2:
1027 { Value w1 = state()->raw_pop();
1028 Value w2 = state()->raw_pop();
1029 state()->raw_push(w2);
1030 state()->raw_push(w1);
1031 state()->raw_push(w2);
1032 state()->raw_push(w1);
1033 }
1034 break;
1035 case Bytecodes::_dup2_x1:
1036 { Value w1 = state()->raw_pop();
1037 Value w2 = state()->raw_pop();
1038 Value w3 = state()->raw_pop();
1039 state()->raw_push(w2);
1040 state()->raw_push(w1);
1041 state()->raw_push(w3);
1042 state()->raw_push(w2);
1043 state()->raw_push(w1);
1044 }
1045 break;
1046 case Bytecodes::_dup2_x2:
1047 { Value w1 = state()->raw_pop();
1048 Value w2 = state()->raw_pop();
1049 Value w3 = state()->raw_pop();
1050 Value w4 = state()->raw_pop();
1051 state()->raw_push(w2);
1052 state()->raw_push(w1);
1053 state()->raw_push(w4);
1054 state()->raw_push(w3);
1055 state()->raw_push(w2);
1056 state()->raw_push(w1);
1057 }
1058 break;
1059 case Bytecodes::_swap:
1060 { Value w1 = state()->raw_pop();
1061 Value w2 = state()->raw_pop();
1062 state()->raw_push(w1);
1063 state()->raw_push(w2);
1064 }
1065 break;
1066 default:
1067 ShouldNotReachHere();
1068 break;
1069 }
1070 }
1073 void GraphBuilder::arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* state_before) {
1074 Value y = pop(type);
1075 Value x = pop(type);
1076 // NOTE: strictfp can be queried from current method since we don't
1077 // inline methods with differing strictfp bits
1078 Value res = new ArithmeticOp(code, x, y, method()->is_strict(), state_before);
1079 // Note: currently single-precision floating-point rounding on Intel is handled at the LIRGenerator level
1080 res = append(res);
1081 if (method()->is_strict()) {
1082 res = round_fp(res);
1083 }
1084 push(type, res);
1085 }
1088 void GraphBuilder::negate_op(ValueType* type) {
1089 push(type, append(new NegateOp(pop(type))));
1090 }
1093 void GraphBuilder::shift_op(ValueType* type, Bytecodes::Code code) {
1094 Value s = ipop();
1095 Value x = pop(type);
1096 // try to simplify
1097 // Note: This code should go into the canonicalizer as soon as it can
1098 // can handle canonicalized forms that contain more than one node.
1099 if (CanonicalizeNodes && code == Bytecodes::_iushr) {
1100 // pattern: x >>> s
1101 IntConstant* s1 = s->type()->as_IntConstant();
1102 if (s1 != NULL) {
1103 // pattern: x >>> s1, with s1 constant
1104 ShiftOp* l = x->as_ShiftOp();
1105 if (l != NULL && l->op() == Bytecodes::_ishl) {
1106 // pattern: (a << b) >>> s1
1107 IntConstant* s0 = l->y()->type()->as_IntConstant();
1108 if (s0 != NULL) {
1109 // pattern: (a << s0) >>> s1
1110 const int s0c = s0->value() & 0x1F; // only the low 5 bits are significant for shifts
1111 const int s1c = s1->value() & 0x1F; // only the low 5 bits are significant for shifts
1112 if (s0c == s1c) {
1113 if (s0c == 0) {
1114 // pattern: (a << 0) >>> 0 => simplify to: a
1115 ipush(l->x());
1116 } else {
1117 // pattern: (a << s0c) >>> s0c => simplify to: a & m, with m constant
1118 assert(0 < s0c && s0c < BitsPerInt, "adjust code below to handle corner cases");
1119 const int m = (1 << (BitsPerInt - s0c)) - 1;
1120 Value s = append(new Constant(new IntConstant(m)));
1121 ipush(append(new LogicOp(Bytecodes::_iand, l->x(), s)));
1122 }
1123 return;
1124 }
1125 }
1126 }
1127 }
1128 }
1129 // could not simplify
1130 push(type, append(new ShiftOp(code, x, s)));
1131 }
1134 void GraphBuilder::logic_op(ValueType* type, Bytecodes::Code code) {
1135 Value y = pop(type);
1136 Value x = pop(type);
1137 push(type, append(new LogicOp(code, x, y)));
1138 }
1141 void GraphBuilder::compare_op(ValueType* type, Bytecodes::Code code) {
1142 ValueStack* state_before = copy_state_before();
1143 Value y = pop(type);
1144 Value x = pop(type);
1145 ipush(append(new CompareOp(code, x, y, state_before)));
1146 }
1149 void GraphBuilder::convert(Bytecodes::Code op, BasicType from, BasicType to) {
1150 push(as_ValueType(to), append(new Convert(op, pop(as_ValueType(from)), as_ValueType(to))));
1151 }
1154 void GraphBuilder::increment() {
1155 int index = stream()->get_index();
1156 int delta = stream()->is_wide() ? (signed short)Bytes::get_Java_u2(stream()->cur_bcp() + 4) : (signed char)(stream()->cur_bcp()[2]);
1157 load_local(intType, index);
1158 ipush(append(new Constant(new IntConstant(delta))));
1159 arithmetic_op(intType, Bytecodes::_iadd);
1160 store_local(intType, index);
1161 }
1164 void GraphBuilder::_goto(int from_bci, int to_bci) {
1165 Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci);
1166 if (is_profiling()) {
1167 compilation()->set_would_profile(true);
1168 x->set_profiled_bci(bci());
1169 if (profile_branches()) {
1170 x->set_profiled_method(method());
1171 x->set_should_profile(true);
1172 }
1173 }
1174 append(x);
1175 }
1178 void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) {
1179 BlockBegin* tsux = block_at(stream()->get_dest());
1180 BlockBegin* fsux = block_at(stream()->next_bci());
1181 bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci();
1182 Instruction *i = append(new If(x, cond, false, y, tsux, fsux, is_bb ? state_before : NULL, is_bb));
1184 assert(i->as_Goto() == NULL ||
1185 (i->as_Goto()->sux_at(0) == tsux && i->as_Goto()->is_safepoint() == tsux->bci() < stream()->cur_bci()) ||
1186 (i->as_Goto()->sux_at(0) == fsux && i->as_Goto()->is_safepoint() == fsux->bci() < stream()->cur_bci()),
1187 "safepoint state of Goto returned by canonicalizer incorrect");
1189 if (is_profiling()) {
1190 If* if_node = i->as_If();
1191 if (if_node != NULL) {
1192 // Note that we'd collect profile data in this method if we wanted it.
1193 compilation()->set_would_profile(true);
1194 // At level 2 we need the proper bci to count backedges
1195 if_node->set_profiled_bci(bci());
1196 if (profile_branches()) {
1197 // Successors can be rotated by the canonicalizer, check for this case.
1198 if_node->set_profiled_method(method());
1199 if_node->set_should_profile(true);
1200 if (if_node->tsux() == fsux) {
1201 if_node->set_swapped(true);
1202 }
1203 }
1204 return;
1205 }
1207 // Check if this If was reduced to Goto.
1208 Goto *goto_node = i->as_Goto();
1209 if (goto_node != NULL) {
1210 compilation()->set_would_profile(true);
1211 goto_node->set_profiled_bci(bci());
1212 if (profile_branches()) {
1213 goto_node->set_profiled_method(method());
1214 goto_node->set_should_profile(true);
1215 // Find out which successor is used.
1216 if (goto_node->default_sux() == tsux) {
1217 goto_node->set_direction(Goto::taken);
1218 } else if (goto_node->default_sux() == fsux) {
1219 goto_node->set_direction(Goto::not_taken);
1220 } else {
1221 ShouldNotReachHere();
1222 }
1223 }
1224 return;
1225 }
1226 }
1227 }
1230 void GraphBuilder::if_zero(ValueType* type, If::Condition cond) {
1231 Value y = append(new Constant(intZero));
1232 ValueStack* state_before = copy_state_before();
1233 Value x = ipop();
1234 if_node(x, cond, y, state_before);
1235 }
1238 void GraphBuilder::if_null(ValueType* type, If::Condition cond) {
1239 Value y = append(new Constant(objectNull));
1240 ValueStack* state_before = copy_state_before();
1241 Value x = apop();
1242 if_node(x, cond, y, state_before);
1243 }
1246 void GraphBuilder::if_same(ValueType* type, If::Condition cond) {
1247 ValueStack* state_before = copy_state_before();
1248 Value y = pop(type);
1249 Value x = pop(type);
1250 if_node(x, cond, y, state_before);
1251 }
1254 void GraphBuilder::jsr(int dest) {
1255 // We only handle well-formed jsrs (those which are "block-structured").
1256 // If the bytecodes are strange (jumping out of a jsr block) then we
1257 // might end up trying to re-parse a block containing a jsr which
1258 // has already been activated. Watch for this case and bail out.
1259 for (ScopeData* cur_scope_data = scope_data();
1260 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
1261 cur_scope_data = cur_scope_data->parent()) {
1262 if (cur_scope_data->jsr_entry_bci() == dest) {
1263 BAILOUT("too-complicated jsr/ret structure");
1264 }
1265 }
1267 push(addressType, append(new Constant(new AddressConstant(next_bci()))));
1268 if (!try_inline_jsr(dest)) {
1269 return; // bailed out while parsing and inlining subroutine
1270 }
1271 }
1274 void GraphBuilder::ret(int local_index) {
1275 if (!parsing_jsr()) BAILOUT("ret encountered while not parsing subroutine");
1277 if (local_index != scope_data()->jsr_return_address_local()) {
1278 BAILOUT("can not handle complicated jsr/ret constructs");
1279 }
1281 // Rets simply become (NON-SAFEPOINT) gotos to the jsr continuation
1282 append(new Goto(scope_data()->jsr_continuation(), false));
1283 }
1286 void GraphBuilder::table_switch() {
1287 Bytecode_tableswitch sw(stream());
1288 const int l = sw.length();
1289 if (CanonicalizeNodes && l == 1) {
1290 // total of 2 successors => use If instead of switch
1291 // Note: This code should go into the canonicalizer as soon as it can
1292 // can handle canonicalized forms that contain more than one node.
1293 Value key = append(new Constant(new IntConstant(sw.low_key())));
1294 BlockBegin* tsux = block_at(bci() + sw.dest_offset_at(0));
1295 BlockBegin* fsux = block_at(bci() + sw.default_offset());
1296 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
1297 ValueStack* state_before = is_bb ? copy_state_before() : NULL;
1298 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
1299 } else {
1300 // collect successors
1301 BlockList* sux = new BlockList(l + 1, NULL);
1302 int i;
1303 bool has_bb = false;
1304 for (i = 0; i < l; i++) {
1305 sux->at_put(i, block_at(bci() + sw.dest_offset_at(i)));
1306 if (sw.dest_offset_at(i) < 0) has_bb = true;
1307 }
1308 // add default successor
1309 if (sw.default_offset() < 0) has_bb = true;
1310 sux->at_put(i, block_at(bci() + sw.default_offset()));
1311 ValueStack* state_before = has_bb ? copy_state_before() : NULL;
1312 Instruction* res = append(new TableSwitch(ipop(), sux, sw.low_key(), state_before, has_bb));
1313 #ifdef ASSERT
1314 if (res->as_Goto()) {
1315 for (i = 0; i < l; i++) {
1316 if (sux->at(i) == res->as_Goto()->sux_at(0)) {
1317 assert(res->as_Goto()->is_safepoint() == sw.dest_offset_at(i) < 0, "safepoint state of Goto returned by canonicalizer incorrect");
1318 }
1319 }
1320 }
1321 #endif
1322 }
1323 }
1326 void GraphBuilder::lookup_switch() {
1327 Bytecode_lookupswitch sw(stream());
1328 const int l = sw.number_of_pairs();
1329 if (CanonicalizeNodes && l == 1) {
1330 // total of 2 successors => use If instead of switch
1331 // Note: This code should go into the canonicalizer as soon as it can
1332 // can handle canonicalized forms that contain more than one node.
1333 // simplify to If
1334 LookupswitchPair pair = sw.pair_at(0);
1335 Value key = append(new Constant(new IntConstant(pair.match())));
1336 BlockBegin* tsux = block_at(bci() + pair.offset());
1337 BlockBegin* fsux = block_at(bci() + sw.default_offset());
1338 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
1339 ValueStack* state_before = is_bb ? copy_state_before() : NULL;
1340 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
1341 } else {
1342 // collect successors & keys
1343 BlockList* sux = new BlockList(l + 1, NULL);
1344 intArray* keys = new intArray(l, 0);
1345 int i;
1346 bool has_bb = false;
1347 for (i = 0; i < l; i++) {
1348 LookupswitchPair pair = sw.pair_at(i);
1349 if (pair.offset() < 0) has_bb = true;
1350 sux->at_put(i, block_at(bci() + pair.offset()));
1351 keys->at_put(i, pair.match());
1352 }
1353 // add default successor
1354 if (sw.default_offset() < 0) has_bb = true;
1355 sux->at_put(i, block_at(bci() + sw.default_offset()));
1356 ValueStack* state_before = has_bb ? copy_state_before() : NULL;
1357 Instruction* res = append(new LookupSwitch(ipop(), sux, keys, state_before, has_bb));
1358 #ifdef ASSERT
1359 if (res->as_Goto()) {
1360 for (i = 0; i < l; i++) {
1361 if (sux->at(i) == res->as_Goto()->sux_at(0)) {
1362 assert(res->as_Goto()->is_safepoint() == sw.pair_at(i).offset() < 0, "safepoint state of Goto returned by canonicalizer incorrect");
1363 }
1364 }
1365 }
1366 #endif
1367 }
1368 }
1370 void GraphBuilder::call_register_finalizer() {
1371 // If the receiver requires finalization then emit code to perform
1372 // the registration on return.
1374 // Gather some type information about the receiver
1375 Value receiver = state()->local_at(0);
1376 assert(receiver != NULL, "must have a receiver");
1377 ciType* declared_type = receiver->declared_type();
1378 ciType* exact_type = receiver->exact_type();
1379 if (exact_type == NULL &&
1380 receiver->as_Local() &&
1381 receiver->as_Local()->java_index() == 0) {
1382 ciInstanceKlass* ik = compilation()->method()->holder();
1383 if (ik->is_final()) {
1384 exact_type = ik;
1385 } else if (UseCHA && !(ik->has_subklass() || ik->is_interface())) {
1386 // test class is leaf class
1387 compilation()->dependency_recorder()->assert_leaf_type(ik);
1388 exact_type = ik;
1389 } else {
1390 declared_type = ik;
1391 }
1392 }
1394 // see if we know statically that registration isn't required
1395 bool needs_check = true;
1396 if (exact_type != NULL) {
1397 needs_check = exact_type->as_instance_klass()->has_finalizer();
1398 } else if (declared_type != NULL) {
1399 ciInstanceKlass* ik = declared_type->as_instance_klass();
1400 if (!Dependencies::has_finalizable_subclass(ik)) {
1401 compilation()->dependency_recorder()->assert_has_no_finalizable_subclasses(ik);
1402 needs_check = false;
1403 }
1404 }
1406 if (needs_check) {
1407 // Perform the registration of finalizable objects.
1408 ValueStack* state_before = copy_state_for_exception();
1409 load_local(objectType, 0);
1410 append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init,
1411 state()->pop_arguments(1),
1412 true, state_before, true));
1413 }
1414 }
1417 void GraphBuilder::method_return(Value x) {
1418 if (RegisterFinalizersAtInit &&
1419 method()->intrinsic_id() == vmIntrinsics::_Object_init) {
1420 call_register_finalizer();
1421 }
1423 // Check to see whether we are inlining. If so, Return
1424 // instructions become Gotos to the continuation point.
1425 if (continuation() != NULL) {
1426 assert(!method()->is_synchronized() || InlineSynchronizedMethods, "can not inline synchronized methods yet");
1428 if (compilation()->env()->dtrace_method_probes()) {
1429 // Report exit from inline methods
1430 Values* args = new Values(1);
1431 args->push(append(new Constant(new ObjectConstant(method()))));
1432 append(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args));
1433 }
1435 // If the inlined method is synchronized, the monitor must be
1436 // released before we jump to the continuation block.
1437 if (method()->is_synchronized()) {
1438 assert(state()->locks_size() == 1, "receiver must be locked here");
1439 monitorexit(state()->lock_at(0), SynchronizationEntryBCI);
1440 }
1442 // State at end of inlined method is the state of the caller
1443 // without the method parameters on stack, including the
1444 // return value, if any, of the inlined method on operand stack.
1445 set_state(state()->caller_state()->copy_for_parsing());
1446 if (x != NULL) {
1447 state()->push(x->type(), x);
1448 }
1449 Goto* goto_callee = new Goto(continuation(), false);
1451 // See whether this is the first return; if so, store off some
1452 // of the state for later examination
1453 if (num_returns() == 0) {
1454 set_inline_cleanup_info();
1455 }
1457 // The current bci() is in the wrong scope, so use the bci() of
1458 // the continuation point.
1459 append_with_bci(goto_callee, scope_data()->continuation()->bci());
1460 incr_num_returns();
1462 return;
1463 }
1465 state()->truncate_stack(0);
1466 if (method()->is_synchronized()) {
1467 // perform the unlocking before exiting the method
1468 Value receiver;
1469 if (!method()->is_static()) {
1470 receiver = _initial_state->local_at(0);
1471 } else {
1472 receiver = append(new Constant(new ClassConstant(method()->holder())));
1473 }
1474 append_split(new MonitorExit(receiver, state()->unlock()));
1475 }
1477 append(new Return(x));
1478 }
1481 void GraphBuilder::access_field(Bytecodes::Code code) {
1482 bool will_link;
1483 ciField* field = stream()->get_field(will_link);
1484 ciInstanceKlass* holder = field->holder();
1485 BasicType field_type = field->type()->basic_type();
1486 ValueType* type = as_ValueType(field_type);
1487 // call will_link again to determine if the field is valid.
1488 const bool needs_patching = !holder->is_loaded() ||
1489 !field->will_link(method()->holder(), code) ||
1490 PatchALot;
1492 ValueStack* state_before = NULL;
1493 if (!holder->is_initialized() || needs_patching) {
1494 // save state before instruction for debug info when
1495 // deoptimization happens during patching
1496 state_before = copy_state_before();
1497 }
1499 Value obj = NULL;
1500 if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) {
1501 if (state_before != NULL) {
1502 // build a patching constant
1503 obj = new Constant(new InstanceConstant(holder->java_mirror()), state_before);
1504 } else {
1505 obj = new Constant(new InstanceConstant(holder->java_mirror()));
1506 }
1507 }
1510 const int offset = !needs_patching ? field->offset() : -1;
1511 switch (code) {
1512 case Bytecodes::_getstatic: {
1513 // check for compile-time constants, i.e., initialized static final fields
1514 Instruction* constant = NULL;
1515 if (field->is_constant() && !PatchALot) {
1516 ciConstant field_val = field->constant_value();
1517 BasicType field_type = field_val.basic_type();
1518 switch (field_type) {
1519 case T_ARRAY:
1520 case T_OBJECT:
1521 if (field_val.as_object()->should_be_constant()) {
1522 constant = new Constant(as_ValueType(field_val));
1523 }
1524 break;
1526 default:
1527 constant = new Constant(as_ValueType(field_val));
1528 }
1529 }
1530 if (constant != NULL) {
1531 push(type, append(constant));
1532 } else {
1533 if (state_before == NULL) {
1534 state_before = copy_state_for_exception();
1535 }
1536 push(type, append(new LoadField(append(obj), offset, field, true,
1537 state_before, needs_patching)));
1538 }
1539 break;
1540 }
1541 case Bytecodes::_putstatic:
1542 { Value val = pop(type);
1543 if (state_before == NULL) {
1544 state_before = copy_state_for_exception();
1545 }
1546 append(new StoreField(append(obj), offset, field, val, true, state_before, needs_patching));
1547 }
1548 break;
1549 case Bytecodes::_getfield :
1550 {
1551 if (state_before == NULL) {
1552 state_before = copy_state_for_exception();
1553 }
1554 LoadField* load = new LoadField(apop(), offset, field, false, state_before, needs_patching);
1555 Value replacement = !needs_patching ? _memory->load(load) : load;
1556 if (replacement != load) {
1557 assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked");
1558 push(type, replacement);
1559 } else {
1560 push(type, append(load));
1561 }
1562 break;
1563 }
1565 case Bytecodes::_putfield :
1566 { Value val = pop(type);
1567 if (state_before == NULL) {
1568 state_before = copy_state_for_exception();
1569 }
1570 StoreField* store = new StoreField(apop(), offset, field, val, false, state_before, needs_patching);
1571 if (!needs_patching) store = _memory->store(store);
1572 if (store != NULL) {
1573 append(store);
1574 }
1575 }
1576 break;
1577 default :
1578 ShouldNotReachHere();
1579 break;
1580 }
1581 }
1584 Dependencies* GraphBuilder::dependency_recorder() const {
1585 assert(DeoptC1, "need debug information");
1586 return compilation()->dependency_recorder();
1587 }
1590 void GraphBuilder::invoke(Bytecodes::Code code) {
1591 bool will_link;
1592 ciMethod* target = stream()->get_method(will_link);
1593 // we have to make sure the argument size (incl. the receiver)
1594 // is correct for compilation (the call would fail later during
1595 // linkage anyway) - was bug (gri 7/28/99)
1596 if (target->is_loaded() && target->is_static() != (code == Bytecodes::_invokestatic)) BAILOUT("will cause link error");
1597 ciInstanceKlass* klass = target->holder();
1599 // check if CHA possible: if so, change the code to invoke_special
1600 ciInstanceKlass* calling_klass = method()->holder();
1601 ciKlass* holder = stream()->get_declared_method_holder();
1602 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder);
1603 ciInstanceKlass* actual_recv = callee_holder;
1605 // some methods are obviously bindable without any type checks so
1606 // convert them directly to an invokespecial.
1607 if (target->is_loaded() && !target->is_abstract() &&
1608 target->can_be_statically_bound() && code == Bytecodes::_invokevirtual) {
1609 code = Bytecodes::_invokespecial;
1610 }
1612 bool is_invokedynamic = code == Bytecodes::_invokedynamic;
1614 // NEEDS_CLEANUP
1615 // I've added the target-is_loaded() test below but I don't really understand
1616 // how klass->is_loaded() can be true and yet target->is_loaded() is false.
1617 // this happened while running the JCK invokevirtual tests under doit. TKR
1618 ciMethod* cha_monomorphic_target = NULL;
1619 ciMethod* exact_target = NULL;
1620 Value better_receiver = NULL;
1621 if (UseCHA && DeoptC1 && klass->is_loaded() && target->is_loaded() &&
1622 !target->is_method_handle_invoke()) {
1623 Value receiver = NULL;
1624 ciInstanceKlass* receiver_klass = NULL;
1625 bool type_is_exact = false;
1626 // try to find a precise receiver type
1627 if (will_link && !target->is_static()) {
1628 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
1629 receiver = state()->stack_at(index);
1630 ciType* type = receiver->exact_type();
1631 if (type != NULL && type->is_loaded() &&
1632 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
1633 receiver_klass = (ciInstanceKlass*) type;
1634 type_is_exact = true;
1635 }
1636 if (type == NULL) {
1637 type = receiver->declared_type();
1638 if (type != NULL && type->is_loaded() &&
1639 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
1640 receiver_klass = (ciInstanceKlass*) type;
1641 if (receiver_klass->is_leaf_type() && !receiver_klass->is_final()) {
1642 // Insert a dependency on this type since
1643 // find_monomorphic_target may assume it's already done.
1644 dependency_recorder()->assert_leaf_type(receiver_klass);
1645 type_is_exact = true;
1646 }
1647 }
1648 }
1649 }
1650 if (receiver_klass != NULL && type_is_exact &&
1651 receiver_klass->is_loaded() && code != Bytecodes::_invokespecial) {
1652 // If we have the exact receiver type we can bind directly to
1653 // the method to call.
1654 exact_target = target->resolve_invoke(calling_klass, receiver_klass);
1655 if (exact_target != NULL) {
1656 target = exact_target;
1657 code = Bytecodes::_invokespecial;
1658 }
1659 }
1660 if (receiver_klass != NULL &&
1661 receiver_klass->is_subtype_of(actual_recv) &&
1662 actual_recv->is_initialized()) {
1663 actual_recv = receiver_klass;
1664 }
1666 if ((code == Bytecodes::_invokevirtual && callee_holder->is_initialized()) ||
1667 (code == Bytecodes::_invokeinterface && callee_holder->is_initialized() && !actual_recv->is_interface())) {
1668 // Use CHA on the receiver to select a more precise method.
1669 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv);
1670 } else if (code == Bytecodes::_invokeinterface && callee_holder->is_loaded() && receiver != NULL) {
1671 // if there is only one implementor of this interface then we
1672 // may be able bind this invoke directly to the implementing
1673 // klass but we need both a dependence on the single interface
1674 // and on the method we bind to. Additionally since all we know
1675 // about the receiver type is the it's supposed to implement the
1676 // interface we have to insert a check that it's the class we
1677 // expect. Interface types are not checked by the verifier so
1678 // they are roughly equivalent to Object.
1679 ciInstanceKlass* singleton = NULL;
1680 if (target->holder()->nof_implementors() == 1) {
1681 singleton = target->holder()->implementor(0);
1683 assert(holder->is_interface(), "invokeinterface to non interface?");
1684 ciInstanceKlass* decl_interface = (ciInstanceKlass*)holder;
1685 // the number of implementors for decl_interface is less or
1686 // equal to the number of implementors for target->holder() so
1687 // if number of implementors of target->holder() == 1 then
1688 // number of implementors for decl_interface is 0 or 1. If
1689 // it's 0 then no class implements decl_interface and there's
1690 // no point in inlining.
1691 if (!holder->is_loaded() || decl_interface->nof_implementors() != 1) {
1692 singleton = NULL;
1693 }
1694 }
1695 if (singleton) {
1696 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, target->holder(), singleton);
1697 if (cha_monomorphic_target != NULL) {
1698 // If CHA is able to bind this invoke then update the class
1699 // to match that class, otherwise klass will refer to the
1700 // interface.
1701 klass = cha_monomorphic_target->holder();
1702 actual_recv = target->holder();
1704 // insert a check it's really the expected class.
1705 CheckCast* c = new CheckCast(klass, receiver, copy_state_for_exception());
1706 c->set_incompatible_class_change_check();
1707 c->set_direct_compare(klass->is_final());
1708 // pass the result of the checkcast so that the compiler has
1709 // more accurate type info in the inlinee
1710 better_receiver = append_split(c);
1711 }
1712 }
1713 }
1714 }
1716 if (cha_monomorphic_target != NULL) {
1717 if (cha_monomorphic_target->is_abstract()) {
1718 // Do not optimize for abstract methods
1719 cha_monomorphic_target = NULL;
1720 }
1721 }
1723 if (cha_monomorphic_target != NULL) {
1724 if (!(target->is_final_method())) {
1725 // If we inlined because CHA revealed only a single target method,
1726 // then we are dependent on that target method not getting overridden
1727 // by dynamic class loading. Be sure to test the "static" receiver
1728 // dest_method here, as opposed to the actual receiver, which may
1729 // falsely lead us to believe that the receiver is final or private.
1730 dependency_recorder()->assert_unique_concrete_method(actual_recv, cha_monomorphic_target);
1731 }
1732 code = Bytecodes::_invokespecial;
1733 }
1734 // check if we could do inlining
1735 if (!PatchALot && Inline && klass->is_loaded() &&
1736 (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized())
1737 && target->will_link(klass, callee_holder, code)) {
1738 // callee is known => check if we have static binding
1739 assert(target->is_loaded(), "callee must be known");
1740 if (code == Bytecodes::_invokestatic ||
1741 code == Bytecodes::_invokespecial ||
1742 code == Bytecodes::_invokevirtual && target->is_final_method() ||
1743 code == Bytecodes::_invokedynamic) {
1744 ciMethod* inline_target = (cha_monomorphic_target != NULL) ? cha_monomorphic_target : target;
1745 bool success = false;
1746 if (target->is_method_handle_invoke()) {
1747 // method handle invokes
1748 success = !is_invokedynamic ? for_method_handle_inline(target) : for_invokedynamic_inline(target);
1749 }
1750 if (!success) {
1751 // static binding => check if callee is ok
1752 success = try_inline(inline_target, (cha_monomorphic_target != NULL) || (exact_target != NULL), better_receiver);
1753 }
1754 CHECK_BAILOUT();
1756 #ifndef PRODUCT
1757 // printing
1758 if (PrintInlining && !success) {
1759 // if it was successfully inlined, then it was already printed.
1760 print_inline_result(inline_target, success);
1761 }
1762 #endif
1763 clear_inline_bailout();
1764 if (success) {
1765 // Register dependence if JVMTI has either breakpoint
1766 // setting or hotswapping of methods capabilities since they may
1767 // cause deoptimization.
1768 if (compilation()->env()->jvmti_can_hotswap_or_post_breakpoint()) {
1769 dependency_recorder()->assert_evol_method(inline_target);
1770 }
1771 return;
1772 }
1773 }
1774 }
1775 // If we attempted an inline which did not succeed because of a
1776 // bailout during construction of the callee graph, the entire
1777 // compilation has to be aborted. This is fairly rare and currently
1778 // seems to only occur for jasm-generated classes which contain
1779 // jsr/ret pairs which are not associated with finally clauses and
1780 // do not have exception handlers in the containing method, and are
1781 // therefore not caught early enough to abort the inlining without
1782 // corrupting the graph. (We currently bail out with a non-empty
1783 // stack at a ret in these situations.)
1784 CHECK_BAILOUT();
1786 // inlining not successful => standard invoke
1787 bool is_loaded = target->is_loaded();
1788 bool has_receiver =
1789 code == Bytecodes::_invokespecial ||
1790 code == Bytecodes::_invokevirtual ||
1791 code == Bytecodes::_invokeinterface;
1792 ValueType* result_type = as_ValueType(target->return_type());
1794 // We require the debug info to be the "state before" because
1795 // invokedynamics may deoptimize.
1796 ValueStack* state_before = is_invokedynamic ? copy_state_before() : copy_state_exhandling();
1798 Values* args = state()->pop_arguments(target->arg_size_no_receiver());
1799 Value recv = has_receiver ? apop() : NULL;
1800 int vtable_index = methodOopDesc::invalid_vtable_index;
1802 #ifdef SPARC
1803 // Currently only supported on Sparc.
1804 // The UseInlineCaches only controls dispatch to invokevirtuals for
1805 // loaded classes which we weren't able to statically bind.
1806 if (!UseInlineCaches && is_loaded && code == Bytecodes::_invokevirtual
1807 && !target->can_be_statically_bound()) {
1808 // Find a vtable index if one is available
1809 vtable_index = target->resolve_vtable_index(calling_klass, callee_holder);
1810 }
1811 #endif
1813 if (recv != NULL &&
1814 (code == Bytecodes::_invokespecial ||
1815 !is_loaded || target->is_final())) {
1816 // invokespecial always needs a NULL check. invokevirtual where
1817 // the target is final or where it's not known that whether the
1818 // target is final requires a NULL check. Otherwise normal
1819 // invokevirtual will perform the null check during the lookup
1820 // logic or the unverified entry point. Profiling of calls
1821 // requires that the null check is performed in all cases.
1822 null_check(recv);
1823 }
1825 if (is_profiling()) {
1826 if (recv != NULL && profile_calls()) {
1827 null_check(recv);
1828 }
1829 // Note that we'd collect profile data in this method if we wanted it.
1830 compilation()->set_would_profile(true);
1832 if (profile_calls()) {
1833 assert(cha_monomorphic_target == NULL || exact_target == NULL, "both can not be set");
1834 ciKlass* target_klass = NULL;
1835 if (cha_monomorphic_target != NULL) {
1836 target_klass = cha_monomorphic_target->holder();
1837 } else if (exact_target != NULL) {
1838 target_klass = exact_target->holder();
1839 }
1840 profile_call(recv, target_klass);
1841 }
1842 }
1844 Invoke* result = new Invoke(code, result_type, recv, args, vtable_index, target, state_before);
1845 // push result
1846 append_split(result);
1848 if (result_type != voidType) {
1849 if (method()->is_strict()) {
1850 push(result_type, round_fp(result));
1851 } else {
1852 push(result_type, result);
1853 }
1854 }
1855 }
1858 void GraphBuilder::new_instance(int klass_index) {
1859 ValueStack* state_before = copy_state_exhandling();
1860 bool will_link;
1861 ciKlass* klass = stream()->get_klass(will_link);
1862 assert(klass->is_instance_klass(), "must be an instance klass");
1863 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before);
1864 _memory->new_instance(new_instance);
1865 apush(append_split(new_instance));
1866 }
1869 void GraphBuilder::new_type_array() {
1870 ValueStack* state_before = copy_state_exhandling();
1871 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before)));
1872 }
1875 void GraphBuilder::new_object_array() {
1876 bool will_link;
1877 ciKlass* klass = stream()->get_klass(will_link);
1878 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
1879 NewArray* n = new NewObjectArray(klass, ipop(), state_before);
1880 apush(append_split(n));
1881 }
1884 bool GraphBuilder::direct_compare(ciKlass* k) {
1885 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) {
1886 ciInstanceKlass* ik = k->as_instance_klass();
1887 if (ik->is_final()) {
1888 return true;
1889 } else {
1890 if (DeoptC1 && UseCHA && !(ik->has_subklass() || ik->is_interface())) {
1891 // test class is leaf class
1892 dependency_recorder()->assert_leaf_type(ik);
1893 return true;
1894 }
1895 }
1896 }
1897 return false;
1898 }
1901 void GraphBuilder::check_cast(int klass_index) {
1902 bool will_link;
1903 ciKlass* klass = stream()->get_klass(will_link);
1904 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_for_exception();
1905 CheckCast* c = new CheckCast(klass, apop(), state_before);
1906 apush(append_split(c));
1907 c->set_direct_compare(direct_compare(klass));
1909 if (is_profiling()) {
1910 // Note that we'd collect profile data in this method if we wanted it.
1911 compilation()->set_would_profile(true);
1913 if (profile_checkcasts()) {
1914 c->set_profiled_method(method());
1915 c->set_profiled_bci(bci());
1916 c->set_should_profile(true);
1917 }
1918 }
1919 }
1922 void GraphBuilder::instance_of(int klass_index) {
1923 bool will_link;
1924 ciKlass* klass = stream()->get_klass(will_link);
1925 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
1926 InstanceOf* i = new InstanceOf(klass, apop(), state_before);
1927 ipush(append_split(i));
1928 i->set_direct_compare(direct_compare(klass));
1930 if (is_profiling()) {
1931 // Note that we'd collect profile data in this method if we wanted it.
1932 compilation()->set_would_profile(true);
1934 if (profile_checkcasts()) {
1935 i->set_profiled_method(method());
1936 i->set_profiled_bci(bci());
1937 i->set_should_profile(true);
1938 }
1939 }
1940 }
1943 void GraphBuilder::monitorenter(Value x, int bci) {
1944 // save state before locking in case of deoptimization after a NullPointerException
1945 ValueStack* state_before = copy_state_for_exception_with_bci(bci);
1946 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before), bci);
1947 kill_all();
1948 }
1951 void GraphBuilder::monitorexit(Value x, int bci) {
1952 append_with_bci(new MonitorExit(x, state()->unlock()), bci);
1953 kill_all();
1954 }
1957 void GraphBuilder::new_multi_array(int dimensions) {
1958 bool will_link;
1959 ciKlass* klass = stream()->get_klass(will_link);
1960 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
1962 Values* dims = new Values(dimensions, NULL);
1963 // fill in all dimensions
1964 int i = dimensions;
1965 while (i-- > 0) dims->at_put(i, ipop());
1966 // create array
1967 NewArray* n = new NewMultiArray(klass, dims, state_before);
1968 apush(append_split(n));
1969 }
1972 void GraphBuilder::throw_op(int bci) {
1973 // We require that the debug info for a Throw be the "state before"
1974 // the Throw (i.e., exception oop is still on TOS)
1975 ValueStack* state_before = copy_state_before_with_bci(bci);
1976 Throw* t = new Throw(apop(), state_before);
1977 // operand stack not needed after a throw
1978 state()->truncate_stack(0);
1979 append_with_bci(t, bci);
1980 }
1983 Value GraphBuilder::round_fp(Value fp_value) {
1984 // no rounding needed if SSE2 is used
1985 if (RoundFPResults && UseSSE < 2) {
1986 // Must currently insert rounding node for doubleword values that
1987 // are results of expressions (i.e., not loads from memory or
1988 // constants)
1989 if (fp_value->type()->tag() == doubleTag &&
1990 fp_value->as_Constant() == NULL &&
1991 fp_value->as_Local() == NULL && // method parameters need no rounding
1992 fp_value->as_RoundFP() == NULL) {
1993 return append(new RoundFP(fp_value));
1994 }
1995 }
1996 return fp_value;
1997 }
2000 Instruction* GraphBuilder::append_with_bci(Instruction* instr, int bci) {
2001 Canonicalizer canon(compilation(), instr, bci);
2002 Instruction* i1 = canon.canonical();
2003 if (i1->is_linked() || !i1->can_be_linked()) {
2004 // Canonicalizer returned an instruction which was already
2005 // appended so simply return it.
2006 return i1;
2007 }
2009 if (UseLocalValueNumbering) {
2010 // Lookup the instruction in the ValueMap and add it to the map if
2011 // it's not found.
2012 Instruction* i2 = vmap()->find_insert(i1);
2013 if (i2 != i1) {
2014 // found an entry in the value map, so just return it.
2015 assert(i2->is_linked(), "should already be linked");
2016 return i2;
2017 }
2018 ValueNumberingEffects vne(vmap());
2019 i1->visit(&vne);
2020 }
2022 // i1 was not eliminated => append it
2023 assert(i1->next() == NULL, "shouldn't already be linked");
2024 _last = _last->set_next(i1, canon.bci());
2026 if (++_instruction_count >= InstructionCountCutoff && !bailed_out()) {
2027 // set the bailout state but complete normal processing. We
2028 // might do a little more work before noticing the bailout so we
2029 // want processing to continue normally until it's noticed.
2030 bailout("Method and/or inlining is too large");
2031 }
2033 #ifndef PRODUCT
2034 if (PrintIRDuringConstruction) {
2035 InstructionPrinter ip;
2036 ip.print_line(i1);
2037 if (Verbose) {
2038 state()->print();
2039 }
2040 }
2041 #endif
2043 // save state after modification of operand stack for StateSplit instructions
2044 StateSplit* s = i1->as_StateSplit();
2045 if (s != NULL) {
2046 if (EliminateFieldAccess) {
2047 Intrinsic* intrinsic = s->as_Intrinsic();
2048 if (s->as_Invoke() != NULL || (intrinsic && !intrinsic->preserves_state())) {
2049 _memory->kill();
2050 }
2051 }
2052 s->set_state(state()->copy(ValueStack::StateAfter, canon.bci()));
2053 }
2055 // set up exception handlers for this instruction if necessary
2056 if (i1->can_trap()) {
2057 i1->set_exception_handlers(handle_exception(i1));
2058 assert(i1->exception_state() != NULL || !i1->needs_exception_state() || bailed_out(), "handle_exception must set exception state");
2059 }
2060 return i1;
2061 }
2064 Instruction* GraphBuilder::append(Instruction* instr) {
2065 assert(instr->as_StateSplit() == NULL || instr->as_BlockEnd() != NULL, "wrong append used");
2066 return append_with_bci(instr, bci());
2067 }
2070 Instruction* GraphBuilder::append_split(StateSplit* instr) {
2071 return append_with_bci(instr, bci());
2072 }
2075 void GraphBuilder::null_check(Value value) {
2076 if (value->as_NewArray() != NULL || value->as_NewInstance() != NULL) {
2077 return;
2078 } else {
2079 Constant* con = value->as_Constant();
2080 if (con) {
2081 ObjectType* c = con->type()->as_ObjectType();
2082 if (c && c->is_loaded()) {
2083 ObjectConstant* oc = c->as_ObjectConstant();
2084 if (!oc || !oc->value()->is_null_object()) {
2085 return;
2086 }
2087 }
2088 }
2089 }
2090 append(new NullCheck(value, copy_state_for_exception()));
2091 }
2095 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) {
2096 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != NULL)) {
2097 assert(instruction->exception_state() == NULL
2098 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState
2099 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->jvmti_can_access_local_variables()),
2100 "exception_state should be of exception kind");
2101 return new XHandlers();
2102 }
2104 XHandlers* exception_handlers = new XHandlers();
2105 ScopeData* cur_scope_data = scope_data();
2106 ValueStack* cur_state = instruction->state_before();
2107 ValueStack* prev_state = NULL;
2108 int scope_count = 0;
2110 assert(cur_state != NULL, "state_before must be set");
2111 do {
2112 int cur_bci = cur_state->bci();
2113 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2114 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci(), "invalid bci");
2116 // join with all potential exception handlers
2117 XHandlers* list = cur_scope_data->xhandlers();
2118 const int n = list->length();
2119 for (int i = 0; i < n; i++) {
2120 XHandler* h = list->handler_at(i);
2121 if (h->covers(cur_bci)) {
2122 // h is a potential exception handler => join it
2123 compilation()->set_has_exception_handlers(true);
2125 BlockBegin* entry = h->entry_block();
2126 if (entry == block()) {
2127 // It's acceptable for an exception handler to cover itself
2128 // but we don't handle that in the parser currently. It's
2129 // very rare so we bailout instead of trying to handle it.
2130 BAILOUT_("exception handler covers itself", exception_handlers);
2131 }
2132 assert(entry->bci() == h->handler_bci(), "must match");
2133 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond");
2135 // previously this was a BAILOUT, but this is not necessary
2136 // now because asynchronous exceptions are not handled this way.
2137 assert(entry->state() == NULL || cur_state->total_locks_size() == entry->state()->total_locks_size(), "locks do not match");
2139 // xhandler start with an empty expression stack
2140 if (cur_state->stack_size() != 0) {
2141 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
2142 }
2143 if (instruction->exception_state() == NULL) {
2144 instruction->set_exception_state(cur_state);
2145 }
2147 // Note: Usually this join must work. However, very
2148 // complicated jsr-ret structures where we don't ret from
2149 // the subroutine can cause the objects on the monitor
2150 // stacks to not match because blocks can be parsed twice.
2151 // The only test case we've seen so far which exhibits this
2152 // problem is caught by the infinite recursion test in
2153 // GraphBuilder::jsr() if the join doesn't work.
2154 if (!entry->try_merge(cur_state)) {
2155 BAILOUT_("error while joining with exception handler, prob. due to complicated jsr/rets", exception_handlers);
2156 }
2158 // add current state for correct handling of phi functions at begin of xhandler
2159 int phi_operand = entry->add_exception_state(cur_state);
2161 // add entry to the list of xhandlers of this block
2162 _block->add_exception_handler(entry);
2164 // add back-edge from xhandler entry to this block
2165 if (!entry->is_predecessor(_block)) {
2166 entry->add_predecessor(_block);
2167 }
2169 // clone XHandler because phi_operand and scope_count can not be shared
2170 XHandler* new_xhandler = new XHandler(h);
2171 new_xhandler->set_phi_operand(phi_operand);
2172 new_xhandler->set_scope_count(scope_count);
2173 exception_handlers->append(new_xhandler);
2175 // fill in exception handler subgraph lazily
2176 assert(!entry->is_set(BlockBegin::was_visited_flag), "entry must not be visited yet");
2177 cur_scope_data->add_to_work_list(entry);
2179 // stop when reaching catchall
2180 if (h->catch_type() == 0) {
2181 return exception_handlers;
2182 }
2183 }
2184 }
2186 if (exception_handlers->length() == 0) {
2187 // This scope and all callees do not handle exceptions, so the local
2188 // variables of this scope are not needed. However, the scope itself is
2189 // required for a correct exception stack trace -> clear out the locals.
2190 if (_compilation->env()->jvmti_can_access_local_variables()) {
2191 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
2192 } else {
2193 cur_state = cur_state->copy(ValueStack::EmptyExceptionState, cur_state->bci());
2194 }
2195 if (prev_state != NULL) {
2196 prev_state->set_caller_state(cur_state);
2197 }
2198 if (instruction->exception_state() == NULL) {
2199 instruction->set_exception_state(cur_state);
2200 }
2201 }
2203 // Set up iteration for next time.
2204 // If parsing a jsr, do not grab exception handlers from the
2205 // parent scopes for this method (already got them, and they
2206 // needed to be cloned)
2208 while (cur_scope_data->parsing_jsr()) {
2209 cur_scope_data = cur_scope_data->parent();
2210 }
2212 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2213 assert(cur_state->locks_size() == 0 || cur_state->locks_size() == 1, "unlocking must be done in a catchall exception handler");
2215 prev_state = cur_state;
2216 cur_state = cur_state->caller_state();
2217 cur_scope_data = cur_scope_data->parent();
2218 scope_count++;
2219 } while (cur_scope_data != NULL);
2221 return exception_handlers;
2222 }
2225 // Helper class for simplifying Phis.
2226 class PhiSimplifier : public BlockClosure {
2227 private:
2228 bool _has_substitutions;
2229 Value simplify(Value v);
2231 public:
2232 PhiSimplifier(BlockBegin* start) : _has_substitutions(false) {
2233 start->iterate_preorder(this);
2234 if (_has_substitutions) {
2235 SubstitutionResolver sr(start);
2236 }
2237 }
2238 void block_do(BlockBegin* b);
2239 bool has_substitutions() const { return _has_substitutions; }
2240 };
2243 Value PhiSimplifier::simplify(Value v) {
2244 Phi* phi = v->as_Phi();
2246 if (phi == NULL) {
2247 // no phi function
2248 return v;
2249 } else if (v->has_subst()) {
2250 // already substituted; subst can be phi itself -> simplify
2251 return simplify(v->subst());
2252 } else if (phi->is_set(Phi::cannot_simplify)) {
2253 // already tried to simplify phi before
2254 return phi;
2255 } else if (phi->is_set(Phi::visited)) {
2256 // break cycles in phi functions
2257 return phi;
2258 } else if (phi->type()->is_illegal()) {
2259 // illegal phi functions are ignored anyway
2260 return phi;
2262 } else {
2263 // mark phi function as processed to break cycles in phi functions
2264 phi->set(Phi::visited);
2266 // simplify x = [y, x] and x = [y, y] to y
2267 Value subst = NULL;
2268 int opd_count = phi->operand_count();
2269 for (int i = 0; i < opd_count; i++) {
2270 Value opd = phi->operand_at(i);
2271 assert(opd != NULL, "Operand must exist!");
2273 if (opd->type()->is_illegal()) {
2274 // if one operand is illegal, the entire phi function is illegal
2275 phi->make_illegal();
2276 phi->clear(Phi::visited);
2277 return phi;
2278 }
2280 Value new_opd = simplify(opd);
2281 assert(new_opd != NULL, "Simplified operand must exist!");
2283 if (new_opd != phi && new_opd != subst) {
2284 if (subst == NULL) {
2285 subst = new_opd;
2286 } else {
2287 // no simplification possible
2288 phi->set(Phi::cannot_simplify);
2289 phi->clear(Phi::visited);
2290 return phi;
2291 }
2292 }
2293 }
2295 // sucessfully simplified phi function
2296 assert(subst != NULL, "illegal phi function");
2297 _has_substitutions = true;
2298 phi->clear(Phi::visited);
2299 phi->set_subst(subst);
2301 #ifndef PRODUCT
2302 if (PrintPhiFunctions) {
2303 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());
2304 }
2305 #endif
2307 return subst;
2308 }
2309 }
2312 void PhiSimplifier::block_do(BlockBegin* b) {
2313 for_each_phi_fun(b, phi,
2314 simplify(phi);
2315 );
2317 #ifdef ASSERT
2318 for_each_phi_fun(b, phi,
2319 assert(phi->operand_count() != 1 || phi->subst() != phi, "missed trivial simplification");
2320 );
2322 ValueStack* state = b->state()->caller_state();
2323 for_each_state_value(state, value,
2324 Phi* phi = value->as_Phi();
2325 assert(phi == NULL || phi->block() != b, "must not have phi function to simplify in caller state");
2326 );
2327 #endif
2328 }
2330 // This method is called after all blocks are filled with HIR instructions
2331 // It eliminates all Phi functions of the form x = [y, y] and x = [y, x]
2332 void GraphBuilder::eliminate_redundant_phis(BlockBegin* start) {
2333 PhiSimplifier simplifier(start);
2334 }
2337 void GraphBuilder::connect_to_end(BlockBegin* beg) {
2338 // setup iteration
2339 kill_all();
2340 _block = beg;
2341 _state = beg->state()->copy_for_parsing();
2342 _last = beg;
2343 iterate_bytecodes_for_block(beg->bci());
2344 }
2347 BlockEnd* GraphBuilder::iterate_bytecodes_for_block(int bci) {
2348 #ifndef PRODUCT
2349 if (PrintIRDuringConstruction) {
2350 tty->cr();
2351 InstructionPrinter ip;
2352 ip.print_instr(_block); tty->cr();
2353 ip.print_stack(_block->state()); tty->cr();
2354 ip.print_inline_level(_block);
2355 ip.print_head();
2356 tty->print_cr("locals size: %d stack size: %d", state()->locals_size(), state()->stack_size());
2357 }
2358 #endif
2359 _skip_block = false;
2360 assert(state() != NULL, "ValueStack missing!");
2361 ciBytecodeStream s(method());
2362 s.reset_to_bci(bci);
2363 int prev_bci = bci;
2364 scope_data()->set_stream(&s);
2365 // iterate
2366 Bytecodes::Code code = Bytecodes::_illegal;
2367 bool push_exception = false;
2369 if (block()->is_set(BlockBegin::exception_entry_flag) && block()->next() == NULL) {
2370 // first thing in the exception entry block should be the exception object.
2371 push_exception = true;
2372 }
2374 while (!bailed_out() && last()->as_BlockEnd() == NULL &&
2375 (code = stream()->next()) != ciBytecodeStream::EOBC() &&
2376 (block_at(s.cur_bci()) == NULL || block_at(s.cur_bci()) == block())) {
2377 assert(state()->kind() == ValueStack::Parsing, "invalid state kind");
2379 // Check for active jsr during OSR compilation
2380 if (compilation()->is_osr_compile()
2381 && scope()->is_top_scope()
2382 && parsing_jsr()
2383 && s.cur_bci() == compilation()->osr_bci()) {
2384 bailout("OSR not supported while a jsr is active");
2385 }
2387 if (push_exception) {
2388 apush(append(new ExceptionObject()));
2389 push_exception = false;
2390 }
2392 // handle bytecode
2393 switch (code) {
2394 case Bytecodes::_nop : /* nothing to do */ break;
2395 case Bytecodes::_aconst_null : apush(append(new Constant(objectNull ))); break;
2396 case Bytecodes::_iconst_m1 : ipush(append(new Constant(new IntConstant (-1)))); break;
2397 case Bytecodes::_iconst_0 : ipush(append(new Constant(intZero ))); break;
2398 case Bytecodes::_iconst_1 : ipush(append(new Constant(intOne ))); break;
2399 case Bytecodes::_iconst_2 : ipush(append(new Constant(new IntConstant ( 2)))); break;
2400 case Bytecodes::_iconst_3 : ipush(append(new Constant(new IntConstant ( 3)))); break;
2401 case Bytecodes::_iconst_4 : ipush(append(new Constant(new IntConstant ( 4)))); break;
2402 case Bytecodes::_iconst_5 : ipush(append(new Constant(new IntConstant ( 5)))); break;
2403 case Bytecodes::_lconst_0 : lpush(append(new Constant(new LongConstant ( 0)))); break;
2404 case Bytecodes::_lconst_1 : lpush(append(new Constant(new LongConstant ( 1)))); break;
2405 case Bytecodes::_fconst_0 : fpush(append(new Constant(new FloatConstant ( 0)))); break;
2406 case Bytecodes::_fconst_1 : fpush(append(new Constant(new FloatConstant ( 1)))); break;
2407 case Bytecodes::_fconst_2 : fpush(append(new Constant(new FloatConstant ( 2)))); break;
2408 case Bytecodes::_dconst_0 : dpush(append(new Constant(new DoubleConstant( 0)))); break;
2409 case Bytecodes::_dconst_1 : dpush(append(new Constant(new DoubleConstant( 1)))); break;
2410 case Bytecodes::_bipush : ipush(append(new Constant(new IntConstant(((signed char*)s.cur_bcp())[1])))); break;
2411 case Bytecodes::_sipush : ipush(append(new Constant(new IntConstant((short)Bytes::get_Java_u2(s.cur_bcp()+1))))); break;
2412 case Bytecodes::_ldc : // fall through
2413 case Bytecodes::_ldc_w : // fall through
2414 case Bytecodes::_ldc2_w : load_constant(); break;
2415 case Bytecodes::_iload : load_local(intType , s.get_index()); break;
2416 case Bytecodes::_lload : load_local(longType , s.get_index()); break;
2417 case Bytecodes::_fload : load_local(floatType , s.get_index()); break;
2418 case Bytecodes::_dload : load_local(doubleType , s.get_index()); break;
2419 case Bytecodes::_aload : load_local(instanceType, s.get_index()); break;
2420 case Bytecodes::_iload_0 : load_local(intType , 0); break;
2421 case Bytecodes::_iload_1 : load_local(intType , 1); break;
2422 case Bytecodes::_iload_2 : load_local(intType , 2); break;
2423 case Bytecodes::_iload_3 : load_local(intType , 3); break;
2424 case Bytecodes::_lload_0 : load_local(longType , 0); break;
2425 case Bytecodes::_lload_1 : load_local(longType , 1); break;
2426 case Bytecodes::_lload_2 : load_local(longType , 2); break;
2427 case Bytecodes::_lload_3 : load_local(longType , 3); break;
2428 case Bytecodes::_fload_0 : load_local(floatType , 0); break;
2429 case Bytecodes::_fload_1 : load_local(floatType , 1); break;
2430 case Bytecodes::_fload_2 : load_local(floatType , 2); break;
2431 case Bytecodes::_fload_3 : load_local(floatType , 3); break;
2432 case Bytecodes::_dload_0 : load_local(doubleType, 0); break;
2433 case Bytecodes::_dload_1 : load_local(doubleType, 1); break;
2434 case Bytecodes::_dload_2 : load_local(doubleType, 2); break;
2435 case Bytecodes::_dload_3 : load_local(doubleType, 3); break;
2436 case Bytecodes::_aload_0 : load_local(objectType, 0); break;
2437 case Bytecodes::_aload_1 : load_local(objectType, 1); break;
2438 case Bytecodes::_aload_2 : load_local(objectType, 2); break;
2439 case Bytecodes::_aload_3 : load_local(objectType, 3); break;
2440 case Bytecodes::_iaload : load_indexed(T_INT ); break;
2441 case Bytecodes::_laload : load_indexed(T_LONG ); break;
2442 case Bytecodes::_faload : load_indexed(T_FLOAT ); break;
2443 case Bytecodes::_daload : load_indexed(T_DOUBLE); break;
2444 case Bytecodes::_aaload : load_indexed(T_OBJECT); break;
2445 case Bytecodes::_baload : load_indexed(T_BYTE ); break;
2446 case Bytecodes::_caload : load_indexed(T_CHAR ); break;
2447 case Bytecodes::_saload : load_indexed(T_SHORT ); break;
2448 case Bytecodes::_istore : store_local(intType , s.get_index()); break;
2449 case Bytecodes::_lstore : store_local(longType , s.get_index()); break;
2450 case Bytecodes::_fstore : store_local(floatType , s.get_index()); break;
2451 case Bytecodes::_dstore : store_local(doubleType, s.get_index()); break;
2452 case Bytecodes::_astore : store_local(objectType, s.get_index()); break;
2453 case Bytecodes::_istore_0 : store_local(intType , 0); break;
2454 case Bytecodes::_istore_1 : store_local(intType , 1); break;
2455 case Bytecodes::_istore_2 : store_local(intType , 2); break;
2456 case Bytecodes::_istore_3 : store_local(intType , 3); break;
2457 case Bytecodes::_lstore_0 : store_local(longType , 0); break;
2458 case Bytecodes::_lstore_1 : store_local(longType , 1); break;
2459 case Bytecodes::_lstore_2 : store_local(longType , 2); break;
2460 case Bytecodes::_lstore_3 : store_local(longType , 3); break;
2461 case Bytecodes::_fstore_0 : store_local(floatType , 0); break;
2462 case Bytecodes::_fstore_1 : store_local(floatType , 1); break;
2463 case Bytecodes::_fstore_2 : store_local(floatType , 2); break;
2464 case Bytecodes::_fstore_3 : store_local(floatType , 3); break;
2465 case Bytecodes::_dstore_0 : store_local(doubleType, 0); break;
2466 case Bytecodes::_dstore_1 : store_local(doubleType, 1); break;
2467 case Bytecodes::_dstore_2 : store_local(doubleType, 2); break;
2468 case Bytecodes::_dstore_3 : store_local(doubleType, 3); break;
2469 case Bytecodes::_astore_0 : store_local(objectType, 0); break;
2470 case Bytecodes::_astore_1 : store_local(objectType, 1); break;
2471 case Bytecodes::_astore_2 : store_local(objectType, 2); break;
2472 case Bytecodes::_astore_3 : store_local(objectType, 3); break;
2473 case Bytecodes::_iastore : store_indexed(T_INT ); break;
2474 case Bytecodes::_lastore : store_indexed(T_LONG ); break;
2475 case Bytecodes::_fastore : store_indexed(T_FLOAT ); break;
2476 case Bytecodes::_dastore : store_indexed(T_DOUBLE); break;
2477 case Bytecodes::_aastore : store_indexed(T_OBJECT); break;
2478 case Bytecodes::_bastore : store_indexed(T_BYTE ); break;
2479 case Bytecodes::_castore : store_indexed(T_CHAR ); break;
2480 case Bytecodes::_sastore : store_indexed(T_SHORT ); break;
2481 case Bytecodes::_pop : // fall through
2482 case Bytecodes::_pop2 : // fall through
2483 case Bytecodes::_dup : // fall through
2484 case Bytecodes::_dup_x1 : // fall through
2485 case Bytecodes::_dup_x2 : // fall through
2486 case Bytecodes::_dup2 : // fall through
2487 case Bytecodes::_dup2_x1 : // fall through
2488 case Bytecodes::_dup2_x2 : // fall through
2489 case Bytecodes::_swap : stack_op(code); break;
2490 case Bytecodes::_iadd : arithmetic_op(intType , code); break;
2491 case Bytecodes::_ladd : arithmetic_op(longType , code); break;
2492 case Bytecodes::_fadd : arithmetic_op(floatType , code); break;
2493 case Bytecodes::_dadd : arithmetic_op(doubleType, code); break;
2494 case Bytecodes::_isub : arithmetic_op(intType , code); break;
2495 case Bytecodes::_lsub : arithmetic_op(longType , code); break;
2496 case Bytecodes::_fsub : arithmetic_op(floatType , code); break;
2497 case Bytecodes::_dsub : arithmetic_op(doubleType, code); break;
2498 case Bytecodes::_imul : arithmetic_op(intType , code); break;
2499 case Bytecodes::_lmul : arithmetic_op(longType , code); break;
2500 case Bytecodes::_fmul : arithmetic_op(floatType , code); break;
2501 case Bytecodes::_dmul : arithmetic_op(doubleType, code); break;
2502 case Bytecodes::_idiv : arithmetic_op(intType , code, copy_state_for_exception()); break;
2503 case Bytecodes::_ldiv : arithmetic_op(longType , code, copy_state_for_exception()); break;
2504 case Bytecodes::_fdiv : arithmetic_op(floatType , code); break;
2505 case Bytecodes::_ddiv : arithmetic_op(doubleType, code); break;
2506 case Bytecodes::_irem : arithmetic_op(intType , code, copy_state_for_exception()); break;
2507 case Bytecodes::_lrem : arithmetic_op(longType , code, copy_state_for_exception()); break;
2508 case Bytecodes::_frem : arithmetic_op(floatType , code); break;
2509 case Bytecodes::_drem : arithmetic_op(doubleType, code); break;
2510 case Bytecodes::_ineg : negate_op(intType ); break;
2511 case Bytecodes::_lneg : negate_op(longType ); break;
2512 case Bytecodes::_fneg : negate_op(floatType ); break;
2513 case Bytecodes::_dneg : negate_op(doubleType); break;
2514 case Bytecodes::_ishl : shift_op(intType , code); break;
2515 case Bytecodes::_lshl : shift_op(longType, code); break;
2516 case Bytecodes::_ishr : shift_op(intType , code); break;
2517 case Bytecodes::_lshr : shift_op(longType, code); break;
2518 case Bytecodes::_iushr : shift_op(intType , code); break;
2519 case Bytecodes::_lushr : shift_op(longType, code); break;
2520 case Bytecodes::_iand : logic_op(intType , code); break;
2521 case Bytecodes::_land : logic_op(longType, code); break;
2522 case Bytecodes::_ior : logic_op(intType , code); break;
2523 case Bytecodes::_lor : logic_op(longType, code); break;
2524 case Bytecodes::_ixor : logic_op(intType , code); break;
2525 case Bytecodes::_lxor : logic_op(longType, code); break;
2526 case Bytecodes::_iinc : increment(); break;
2527 case Bytecodes::_i2l : convert(code, T_INT , T_LONG ); break;
2528 case Bytecodes::_i2f : convert(code, T_INT , T_FLOAT ); break;
2529 case Bytecodes::_i2d : convert(code, T_INT , T_DOUBLE); break;
2530 case Bytecodes::_l2i : convert(code, T_LONG , T_INT ); break;
2531 case Bytecodes::_l2f : convert(code, T_LONG , T_FLOAT ); break;
2532 case Bytecodes::_l2d : convert(code, T_LONG , T_DOUBLE); break;
2533 case Bytecodes::_f2i : convert(code, T_FLOAT , T_INT ); break;
2534 case Bytecodes::_f2l : convert(code, T_FLOAT , T_LONG ); break;
2535 case Bytecodes::_f2d : convert(code, T_FLOAT , T_DOUBLE); break;
2536 case Bytecodes::_d2i : convert(code, T_DOUBLE, T_INT ); break;
2537 case Bytecodes::_d2l : convert(code, T_DOUBLE, T_LONG ); break;
2538 case Bytecodes::_d2f : convert(code, T_DOUBLE, T_FLOAT ); break;
2539 case Bytecodes::_i2b : convert(code, T_INT , T_BYTE ); break;
2540 case Bytecodes::_i2c : convert(code, T_INT , T_CHAR ); break;
2541 case Bytecodes::_i2s : convert(code, T_INT , T_SHORT ); break;
2542 case Bytecodes::_lcmp : compare_op(longType , code); break;
2543 case Bytecodes::_fcmpl : compare_op(floatType , code); break;
2544 case Bytecodes::_fcmpg : compare_op(floatType , code); break;
2545 case Bytecodes::_dcmpl : compare_op(doubleType, code); break;
2546 case Bytecodes::_dcmpg : compare_op(doubleType, code); break;
2547 case Bytecodes::_ifeq : if_zero(intType , If::eql); break;
2548 case Bytecodes::_ifne : if_zero(intType , If::neq); break;
2549 case Bytecodes::_iflt : if_zero(intType , If::lss); break;
2550 case Bytecodes::_ifge : if_zero(intType , If::geq); break;
2551 case Bytecodes::_ifgt : if_zero(intType , If::gtr); break;
2552 case Bytecodes::_ifle : if_zero(intType , If::leq); break;
2553 case Bytecodes::_if_icmpeq : if_same(intType , If::eql); break;
2554 case Bytecodes::_if_icmpne : if_same(intType , If::neq); break;
2555 case Bytecodes::_if_icmplt : if_same(intType , If::lss); break;
2556 case Bytecodes::_if_icmpge : if_same(intType , If::geq); break;
2557 case Bytecodes::_if_icmpgt : if_same(intType , If::gtr); break;
2558 case Bytecodes::_if_icmple : if_same(intType , If::leq); break;
2559 case Bytecodes::_if_acmpeq : if_same(objectType, If::eql); break;
2560 case Bytecodes::_if_acmpne : if_same(objectType, If::neq); break;
2561 case Bytecodes::_goto : _goto(s.cur_bci(), s.get_dest()); break;
2562 case Bytecodes::_jsr : jsr(s.get_dest()); break;
2563 case Bytecodes::_ret : ret(s.get_index()); break;
2564 case Bytecodes::_tableswitch : table_switch(); break;
2565 case Bytecodes::_lookupswitch : lookup_switch(); break;
2566 case Bytecodes::_ireturn : method_return(ipop()); break;
2567 case Bytecodes::_lreturn : method_return(lpop()); break;
2568 case Bytecodes::_freturn : method_return(fpop()); break;
2569 case Bytecodes::_dreturn : method_return(dpop()); break;
2570 case Bytecodes::_areturn : method_return(apop()); break;
2571 case Bytecodes::_return : method_return(NULL ); break;
2572 case Bytecodes::_getstatic : // fall through
2573 case Bytecodes::_putstatic : // fall through
2574 case Bytecodes::_getfield : // fall through
2575 case Bytecodes::_putfield : access_field(code); break;
2576 case Bytecodes::_invokevirtual : // fall through
2577 case Bytecodes::_invokespecial : // fall through
2578 case Bytecodes::_invokestatic : // fall through
2579 case Bytecodes::_invokedynamic : // fall through
2580 case Bytecodes::_invokeinterface: invoke(code); break;
2581 case Bytecodes::_new : new_instance(s.get_index_u2()); break;
2582 case Bytecodes::_newarray : new_type_array(); break;
2583 case Bytecodes::_anewarray : new_object_array(); break;
2584 case Bytecodes::_arraylength : { ValueStack* state_before = copy_state_for_exception(); ipush(append(new ArrayLength(apop(), state_before))); break; }
2585 case Bytecodes::_athrow : throw_op(s.cur_bci()); break;
2586 case Bytecodes::_checkcast : check_cast(s.get_index_u2()); break;
2587 case Bytecodes::_instanceof : instance_of(s.get_index_u2()); break;
2588 case Bytecodes::_monitorenter : monitorenter(apop(), s.cur_bci()); break;
2589 case Bytecodes::_monitorexit : monitorexit (apop(), s.cur_bci()); break;
2590 case Bytecodes::_wide : ShouldNotReachHere(); break;
2591 case Bytecodes::_multianewarray : new_multi_array(s.cur_bcp()[3]); break;
2592 case Bytecodes::_ifnull : if_null(objectType, If::eql); break;
2593 case Bytecodes::_ifnonnull : if_null(objectType, If::neq); break;
2594 case Bytecodes::_goto_w : _goto(s.cur_bci(), s.get_far_dest()); break;
2595 case Bytecodes::_jsr_w : jsr(s.get_far_dest()); break;
2596 case Bytecodes::_breakpoint : BAILOUT_("concurrent setting of breakpoint", NULL);
2597 default : ShouldNotReachHere(); break;
2598 }
2599 // save current bci to setup Goto at the end
2600 prev_bci = s.cur_bci();
2601 }
2602 CHECK_BAILOUT_(NULL);
2603 // stop processing of this block (see try_inline_full)
2604 if (_skip_block) {
2605 _skip_block = false;
2606 assert(_last && _last->as_BlockEnd(), "");
2607 return _last->as_BlockEnd();
2608 }
2609 // if there are any, check if last instruction is a BlockEnd instruction
2610 BlockEnd* end = last()->as_BlockEnd();
2611 if (end == NULL) {
2612 // all blocks must end with a BlockEnd instruction => add a Goto
2613 end = new Goto(block_at(s.cur_bci()), false);
2614 append(end);
2615 }
2616 assert(end == last()->as_BlockEnd(), "inconsistency");
2618 assert(end->state() != NULL, "state must already be present");
2619 assert(end->as_Return() == NULL || end->as_Throw() == NULL || end->state()->stack_size() == 0, "stack not needed for return and throw");
2621 // connect to begin & set state
2622 // NOTE that inlining may have changed the block we are parsing
2623 block()->set_end(end);
2624 // propagate state
2625 for (int i = end->number_of_sux() - 1; i >= 0; i--) {
2626 BlockBegin* sux = end->sux_at(i);
2627 assert(sux->is_predecessor(block()), "predecessor missing");
2628 // be careful, bailout if bytecodes are strange
2629 if (!sux->try_merge(end->state())) BAILOUT_("block join failed", NULL);
2630 scope_data()->add_to_work_list(end->sux_at(i));
2631 }
2633 scope_data()->set_stream(NULL);
2635 // done
2636 return end;
2637 }
2640 void GraphBuilder::iterate_all_blocks(bool start_in_current_block_for_inlining) {
2641 do {
2642 if (start_in_current_block_for_inlining && !bailed_out()) {
2643 iterate_bytecodes_for_block(0);
2644 start_in_current_block_for_inlining = false;
2645 } else {
2646 BlockBegin* b;
2647 while ((b = scope_data()->remove_from_work_list()) != NULL) {
2648 if (!b->is_set(BlockBegin::was_visited_flag)) {
2649 if (b->is_set(BlockBegin::osr_entry_flag)) {
2650 // we're about to parse the osr entry block, so make sure
2651 // we setup the OSR edge leading into this block so that
2652 // Phis get setup correctly.
2653 setup_osr_entry_block();
2654 // this is no longer the osr entry block, so clear it.
2655 b->clear(BlockBegin::osr_entry_flag);
2656 }
2657 b->set(BlockBegin::was_visited_flag);
2658 connect_to_end(b);
2659 }
2660 }
2661 }
2662 } while (!bailed_out() && !scope_data()->is_work_list_empty());
2663 }
2666 bool GraphBuilder::_can_trap [Bytecodes::number_of_java_codes];
2668 void GraphBuilder::initialize() {
2669 // the following bytecodes are assumed to potentially
2670 // throw exceptions in compiled code - note that e.g.
2671 // monitorexit & the return bytecodes do not throw
2672 // exceptions since monitor pairing proved that they
2673 // succeed (if monitor pairing succeeded)
2674 Bytecodes::Code can_trap_list[] =
2675 { Bytecodes::_ldc
2676 , Bytecodes::_ldc_w
2677 , Bytecodes::_ldc2_w
2678 , Bytecodes::_iaload
2679 , Bytecodes::_laload
2680 , Bytecodes::_faload
2681 , Bytecodes::_daload
2682 , Bytecodes::_aaload
2683 , Bytecodes::_baload
2684 , Bytecodes::_caload
2685 , Bytecodes::_saload
2686 , Bytecodes::_iastore
2687 , Bytecodes::_lastore
2688 , Bytecodes::_fastore
2689 , Bytecodes::_dastore
2690 , Bytecodes::_aastore
2691 , Bytecodes::_bastore
2692 , Bytecodes::_castore
2693 , Bytecodes::_sastore
2694 , Bytecodes::_idiv
2695 , Bytecodes::_ldiv
2696 , Bytecodes::_irem
2697 , Bytecodes::_lrem
2698 , Bytecodes::_getstatic
2699 , Bytecodes::_putstatic
2700 , Bytecodes::_getfield
2701 , Bytecodes::_putfield
2702 , Bytecodes::_invokevirtual
2703 , Bytecodes::_invokespecial
2704 , Bytecodes::_invokestatic
2705 , Bytecodes::_invokedynamic
2706 , Bytecodes::_invokeinterface
2707 , Bytecodes::_new
2708 , Bytecodes::_newarray
2709 , Bytecodes::_anewarray
2710 , Bytecodes::_arraylength
2711 , Bytecodes::_athrow
2712 , Bytecodes::_checkcast
2713 , Bytecodes::_instanceof
2714 , Bytecodes::_monitorenter
2715 , Bytecodes::_multianewarray
2716 };
2718 // inititialize trap tables
2719 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) {
2720 _can_trap[i] = false;
2721 }
2722 // set standard trap info
2723 for (uint j = 0; j < ARRAY_SIZE(can_trap_list); j++) {
2724 _can_trap[can_trap_list[j]] = true;
2725 }
2726 }
2729 BlockBegin* GraphBuilder::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) {
2730 assert(entry->is_set(f), "entry/flag mismatch");
2731 // create header block
2732 BlockBegin* h = new BlockBegin(entry->bci());
2733 h->set_depth_first_number(0);
2735 Value l = h;
2736 BlockEnd* g = new Goto(entry, false);
2737 l->set_next(g, entry->bci());
2738 h->set_end(g);
2739 h->set(f);
2740 // setup header block end state
2741 ValueStack* s = state->copy(ValueStack::StateAfter, entry->bci()); // can use copy since stack is empty (=> no phis)
2742 assert(s->stack_is_empty(), "must have empty stack at entry point");
2743 g->set_state(s);
2744 return h;
2745 }
2749 BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* state) {
2750 BlockBegin* start = new BlockBegin(0);
2752 // This code eliminates the empty start block at the beginning of
2753 // each method. Previously, each method started with the
2754 // start-block created below, and this block was followed by the
2755 // header block that was always empty. This header block is only
2756 // necesary if std_entry is also a backward branch target because
2757 // then phi functions may be necessary in the header block. It's
2758 // also necessary when profiling so that there's a single block that
2759 // can increment the interpreter_invocation_count.
2760 BlockBegin* new_header_block;
2761 if (std_entry->number_of_preds() > 0 || count_invocations() || count_backedges()) {
2762 new_header_block = header_block(std_entry, BlockBegin::std_entry_flag, state);
2763 } else {
2764 new_header_block = std_entry;
2765 }
2767 // setup start block (root for the IR graph)
2768 Base* base =
2769 new Base(
2770 new_header_block,
2771 osr_entry
2772 );
2773 start->set_next(base, 0);
2774 start->set_end(base);
2775 // create & setup state for start block
2776 start->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
2777 base->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
2779 if (base->std_entry()->state() == NULL) {
2780 // setup states for header blocks
2781 base->std_entry()->merge(state);
2782 }
2784 assert(base->std_entry()->state() != NULL, "");
2785 return start;
2786 }
2789 void GraphBuilder::setup_osr_entry_block() {
2790 assert(compilation()->is_osr_compile(), "only for osrs");
2792 int osr_bci = compilation()->osr_bci();
2793 ciBytecodeStream s(method());
2794 s.reset_to_bci(osr_bci);
2795 s.next();
2796 scope_data()->set_stream(&s);
2798 // create a new block to be the osr setup code
2799 _osr_entry = new BlockBegin(osr_bci);
2800 _osr_entry->set(BlockBegin::osr_entry_flag);
2801 _osr_entry->set_depth_first_number(0);
2802 BlockBegin* target = bci2block()->at(osr_bci);
2803 assert(target != NULL && target->is_set(BlockBegin::osr_entry_flag), "must be there");
2804 // the osr entry has no values for locals
2805 ValueStack* state = target->state()->copy();
2806 _osr_entry->set_state(state);
2808 kill_all();
2809 _block = _osr_entry;
2810 _state = _osr_entry->state()->copy();
2811 assert(_state->bci() == osr_bci, "mismatch");
2812 _last = _osr_entry;
2813 Value e = append(new OsrEntry());
2814 e->set_needs_null_check(false);
2816 // OSR buffer is
2817 //
2818 // locals[nlocals-1..0]
2819 // monitors[number_of_locks-1..0]
2820 //
2821 // locals is a direct copy of the interpreter frame so in the osr buffer
2822 // so first slot in the local array is the last local from the interpreter
2823 // and last slot is local[0] (receiver) from the interpreter
2824 //
2825 // Similarly with locks. The first lock slot in the osr buffer is the nth lock
2826 // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock
2827 // in the interpreter frame (the method lock if a sync method)
2829 // Initialize monitors in the compiled activation.
2831 int index;
2832 Value local;
2834 // find all the locals that the interpreter thinks contain live oops
2835 const BitMap live_oops = method()->live_local_oops_at_bci(osr_bci);
2837 // compute the offset into the locals so that we can treat the buffer
2838 // as if the locals were still in the interpreter frame
2839 int locals_offset = BytesPerWord * (method()->max_locals() - 1);
2840 for_each_local_value(state, index, local) {
2841 int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord;
2842 Value get;
2843 if (local->type()->is_object_kind() && !live_oops.at(index)) {
2844 // The interpreter thinks this local is dead but the compiler
2845 // doesn't so pretend that the interpreter passed in null.
2846 get = append(new Constant(objectNull));
2847 } else {
2848 get = append(new UnsafeGetRaw(as_BasicType(local->type()), e,
2849 append(new Constant(new IntConstant(offset))),
2850 0,
2851 true /*unaligned*/, true /*wide*/));
2852 }
2853 _state->store_local(index, get);
2854 }
2856 // the storage for the OSR buffer is freed manually in the LIRGenerator.
2858 assert(state->caller_state() == NULL, "should be top scope");
2859 state->clear_locals();
2860 Goto* g = new Goto(target, false);
2861 append(g);
2862 _osr_entry->set_end(g);
2863 target->merge(_osr_entry->end()->state());
2865 scope_data()->set_stream(NULL);
2866 }
2869 ValueStack* GraphBuilder::state_at_entry() {
2870 ValueStack* state = new ValueStack(scope(), NULL);
2872 // Set up locals for receiver
2873 int idx = 0;
2874 if (!method()->is_static()) {
2875 // we should always see the receiver
2876 state->store_local(idx, new Local(method()->holder(), objectType, idx));
2877 idx = 1;
2878 }
2880 // Set up locals for incoming arguments
2881 ciSignature* sig = method()->signature();
2882 for (int i = 0; i < sig->count(); i++) {
2883 ciType* type = sig->type_at(i);
2884 BasicType basic_type = type->basic_type();
2885 // don't allow T_ARRAY to propagate into locals types
2886 if (basic_type == T_ARRAY) basic_type = T_OBJECT;
2887 ValueType* vt = as_ValueType(basic_type);
2888 state->store_local(idx, new Local(type, vt, idx));
2889 idx += type->size();
2890 }
2892 // lock synchronized method
2893 if (method()->is_synchronized()) {
2894 state->lock(NULL);
2895 }
2897 return state;
2898 }
2901 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope)
2902 : _scope_data(NULL)
2903 , _instruction_count(0)
2904 , _osr_entry(NULL)
2905 , _memory(new MemoryBuffer())
2906 , _compilation(compilation)
2907 , _inline_bailout_msg(NULL)
2908 {
2909 int osr_bci = compilation->osr_bci();
2911 // determine entry points and bci2block mapping
2912 BlockListBuilder blm(compilation, scope, osr_bci);
2913 CHECK_BAILOUT();
2915 BlockList* bci2block = blm.bci2block();
2916 BlockBegin* start_block = bci2block->at(0);
2918 push_root_scope(scope, bci2block, start_block);
2920 // setup state for std entry
2921 _initial_state = state_at_entry();
2922 start_block->merge(_initial_state);
2924 // complete graph
2925 _vmap = new ValueMap();
2926 switch (scope->method()->intrinsic_id()) {
2927 case vmIntrinsics::_dabs : // fall through
2928 case vmIntrinsics::_dsqrt : // fall through
2929 case vmIntrinsics::_dsin : // fall through
2930 case vmIntrinsics::_dcos : // fall through
2931 case vmIntrinsics::_dtan : // fall through
2932 case vmIntrinsics::_dlog : // fall through
2933 case vmIntrinsics::_dlog10 : // fall through
2934 {
2935 // Compiles where the root method is an intrinsic need a special
2936 // compilation environment because the bytecodes for the method
2937 // shouldn't be parsed during the compilation, only the special
2938 // Intrinsic node should be emitted. If this isn't done the the
2939 // code for the inlined version will be different than the root
2940 // compiled version which could lead to monotonicity problems on
2941 // intel.
2943 // Set up a stream so that appending instructions works properly.
2944 ciBytecodeStream s(scope->method());
2945 s.reset_to_bci(0);
2946 scope_data()->set_stream(&s);
2947 s.next();
2949 // setup the initial block state
2950 _block = start_block;
2951 _state = start_block->state()->copy_for_parsing();
2952 _last = start_block;
2953 load_local(doubleType, 0);
2955 // Emit the intrinsic node.
2956 bool result = try_inline_intrinsics(scope->method());
2957 if (!result) BAILOUT("failed to inline intrinsic");
2958 method_return(dpop());
2960 // connect the begin and end blocks and we're all done.
2961 BlockEnd* end = last()->as_BlockEnd();
2962 block()->set_end(end);
2963 break;
2964 }
2966 case vmIntrinsics::_Reference_get:
2967 {
2968 if (UseG1GC) {
2969 // With java.lang.ref.reference.get() we must go through the
2970 // intrinsic - when G1 is enabled - even when get() is the root
2971 // method of the compile so that, if necessary, the value in
2972 // the referent field of the reference object gets recorded by
2973 // the pre-barrier code.
2974 // Specifically, if G1 is enabled, the value in the referent
2975 // field is recorded by the G1 SATB pre barrier. This will
2976 // result in the referent being marked live and the reference
2977 // object removed from the list of discovered references during
2978 // reference processing.
2980 // Set up a stream so that appending instructions works properly.
2981 ciBytecodeStream s(scope->method());
2982 s.reset_to_bci(0);
2983 scope_data()->set_stream(&s);
2984 s.next();
2986 // setup the initial block state
2987 _block = start_block;
2988 _state = start_block->state()->copy_for_parsing();
2989 _last = start_block;
2990 load_local(objectType, 0);
2992 // Emit the intrinsic node.
2993 bool result = try_inline_intrinsics(scope->method());
2994 if (!result) BAILOUT("failed to inline intrinsic");
2995 method_return(apop());
2997 // connect the begin and end blocks and we're all done.
2998 BlockEnd* end = last()->as_BlockEnd();
2999 block()->set_end(end);
3000 break;
3001 }
3002 // Otherwise, fall thru
3003 }
3005 default:
3006 scope_data()->add_to_work_list(start_block);
3007 iterate_all_blocks();
3008 break;
3009 }
3010 CHECK_BAILOUT();
3012 _start = setup_start_block(osr_bci, start_block, _osr_entry, _initial_state);
3014 eliminate_redundant_phis(_start);
3016 NOT_PRODUCT(if (PrintValueNumbering && Verbose) print_stats());
3017 // for osr compile, bailout if some requirements are not fulfilled
3018 if (osr_bci != -1) {
3019 BlockBegin* osr_block = blm.bci2block()->at(osr_bci);
3020 assert(osr_block->is_set(BlockBegin::was_visited_flag),"osr entry must have been visited for osr compile");
3022 // check if osr entry point has empty stack - we cannot handle non-empty stacks at osr entry points
3023 if (!osr_block->state()->stack_is_empty()) {
3024 BAILOUT("stack not empty at OSR entry point");
3025 }
3026 }
3027 #ifndef PRODUCT
3028 if (PrintCompilation && Verbose) tty->print_cr("Created %d Instructions", _instruction_count);
3029 #endif
3030 }
3033 ValueStack* GraphBuilder::copy_state_before() {
3034 return copy_state_before_with_bci(bci());
3035 }
3037 ValueStack* GraphBuilder::copy_state_exhandling() {
3038 return copy_state_exhandling_with_bci(bci());
3039 }
3041 ValueStack* GraphBuilder::copy_state_for_exception() {
3042 return copy_state_for_exception_with_bci(bci());
3043 }
3045 ValueStack* GraphBuilder::copy_state_before_with_bci(int bci) {
3046 return state()->copy(ValueStack::StateBefore, bci);
3047 }
3049 ValueStack* GraphBuilder::copy_state_exhandling_with_bci(int bci) {
3050 if (!has_handler()) return NULL;
3051 return state()->copy(ValueStack::StateBefore, bci);
3052 }
3054 ValueStack* GraphBuilder::copy_state_for_exception_with_bci(int bci) {
3055 ValueStack* s = copy_state_exhandling_with_bci(bci);
3056 if (s == NULL) {
3057 if (_compilation->env()->jvmti_can_access_local_variables()) {
3058 s = state()->copy(ValueStack::ExceptionState, bci);
3059 } else {
3060 s = state()->copy(ValueStack::EmptyExceptionState, bci);
3061 }
3062 }
3063 return s;
3064 }
3066 int GraphBuilder::recursive_inline_level(ciMethod* cur_callee) const {
3067 int recur_level = 0;
3068 for (IRScope* s = scope(); s != NULL; s = s->caller()) {
3069 if (s->method() == cur_callee) {
3070 ++recur_level;
3071 }
3072 }
3073 return recur_level;
3074 }
3077 bool GraphBuilder::try_inline(ciMethod* callee, bool holder_known, Value receiver) {
3078 // Clear out any existing inline bailout condition
3079 clear_inline_bailout();
3081 if (callee->should_exclude()) {
3082 // callee is excluded
3083 INLINE_BAILOUT("excluded by CompilerOracle")
3084 } else if (callee->should_not_inline()) {
3085 // callee is excluded
3086 INLINE_BAILOUT("disallowed by CompilerOracle")
3087 } else if (!callee->can_be_compiled()) {
3088 // callee is not compilable (prob. has breakpoints)
3089 INLINE_BAILOUT("not compilable (disabled)")
3090 } else if (callee->intrinsic_id() != vmIntrinsics::_none && try_inline_intrinsics(callee)) {
3091 // intrinsics can be native or not
3092 return true;
3093 } else if (callee->is_native()) {
3094 // non-intrinsic natives cannot be inlined
3095 INLINE_BAILOUT("non-intrinsic native")
3096 } else if (callee->is_abstract()) {
3097 INLINE_BAILOUT("abstract")
3098 } else {
3099 return try_inline_full(callee, holder_known, NULL, receiver);
3100 }
3101 }
3104 bool GraphBuilder::try_inline_intrinsics(ciMethod* callee) {
3105 if (!InlineNatives ) INLINE_BAILOUT("intrinsic method inlining disabled");
3106 if (callee->is_synchronized()) {
3107 // We don't currently support any synchronized intrinsics
3108 return false;
3109 }
3111 // callee seems like a good candidate
3112 // determine id
3113 bool preserves_state = false;
3114 bool cantrap = true;
3115 vmIntrinsics::ID id = callee->intrinsic_id();
3116 switch (id) {
3117 case vmIntrinsics::_arraycopy :
3118 if (!InlineArrayCopy) return false;
3119 break;
3121 case vmIntrinsics::_currentTimeMillis:
3122 case vmIntrinsics::_nanoTime:
3123 preserves_state = true;
3124 cantrap = false;
3125 break;
3127 case vmIntrinsics::_floatToRawIntBits :
3128 case vmIntrinsics::_intBitsToFloat :
3129 case vmIntrinsics::_doubleToRawLongBits :
3130 case vmIntrinsics::_longBitsToDouble :
3131 if (!InlineMathNatives) return false;
3132 preserves_state = true;
3133 cantrap = false;
3134 break;
3136 case vmIntrinsics::_getClass :
3137 if (!InlineClassNatives) return false;
3138 preserves_state = true;
3139 break;
3141 case vmIntrinsics::_currentThread :
3142 if (!InlineThreadNatives) return false;
3143 preserves_state = true;
3144 cantrap = false;
3145 break;
3147 case vmIntrinsics::_dabs : // fall through
3148 case vmIntrinsics::_dsqrt : // fall through
3149 case vmIntrinsics::_dsin : // fall through
3150 case vmIntrinsics::_dcos : // fall through
3151 case vmIntrinsics::_dtan : // fall through
3152 case vmIntrinsics::_dlog : // fall through
3153 case vmIntrinsics::_dlog10 : // fall through
3154 if (!InlineMathNatives) return false;
3155 cantrap = false;
3156 preserves_state = true;
3157 break;
3159 // sun/misc/AtomicLong.attemptUpdate
3160 case vmIntrinsics::_attemptUpdate :
3161 if (!VM_Version::supports_cx8()) return false;
3162 if (!InlineAtomicLong) return false;
3163 preserves_state = true;
3164 break;
3166 // Use special nodes for Unsafe instructions so we can more easily
3167 // perform an address-mode optimization on the raw variants
3168 case vmIntrinsics::_getObject : return append_unsafe_get_obj(callee, T_OBJECT, false);
3169 case vmIntrinsics::_getBoolean: return append_unsafe_get_obj(callee, T_BOOLEAN, false);
3170 case vmIntrinsics::_getByte : return append_unsafe_get_obj(callee, T_BYTE, false);
3171 case vmIntrinsics::_getShort : return append_unsafe_get_obj(callee, T_SHORT, false);
3172 case vmIntrinsics::_getChar : return append_unsafe_get_obj(callee, T_CHAR, false);
3173 case vmIntrinsics::_getInt : return append_unsafe_get_obj(callee, T_INT, false);
3174 case vmIntrinsics::_getLong : return append_unsafe_get_obj(callee, T_LONG, false);
3175 case vmIntrinsics::_getFloat : return append_unsafe_get_obj(callee, T_FLOAT, false);
3176 case vmIntrinsics::_getDouble : return append_unsafe_get_obj(callee, T_DOUBLE, false);
3178 case vmIntrinsics::_putObject : return append_unsafe_put_obj(callee, T_OBJECT, false);
3179 case vmIntrinsics::_putBoolean: return append_unsafe_put_obj(callee, T_BOOLEAN, false);
3180 case vmIntrinsics::_putByte : return append_unsafe_put_obj(callee, T_BYTE, false);
3181 case vmIntrinsics::_putShort : return append_unsafe_put_obj(callee, T_SHORT, false);
3182 case vmIntrinsics::_putChar : return append_unsafe_put_obj(callee, T_CHAR, false);
3183 case vmIntrinsics::_putInt : return append_unsafe_put_obj(callee, T_INT, false);
3184 case vmIntrinsics::_putLong : return append_unsafe_put_obj(callee, T_LONG, false);
3185 case vmIntrinsics::_putFloat : return append_unsafe_put_obj(callee, T_FLOAT, false);
3186 case vmIntrinsics::_putDouble : return append_unsafe_put_obj(callee, T_DOUBLE, false);
3188 case vmIntrinsics::_getObjectVolatile : return append_unsafe_get_obj(callee, T_OBJECT, true);
3189 case vmIntrinsics::_getBooleanVolatile: return append_unsafe_get_obj(callee, T_BOOLEAN, true);
3190 case vmIntrinsics::_getByteVolatile : return append_unsafe_get_obj(callee, T_BYTE, true);
3191 case vmIntrinsics::_getShortVolatile : return append_unsafe_get_obj(callee, T_SHORT, true);
3192 case vmIntrinsics::_getCharVolatile : return append_unsafe_get_obj(callee, T_CHAR, true);
3193 case vmIntrinsics::_getIntVolatile : return append_unsafe_get_obj(callee, T_INT, true);
3194 case vmIntrinsics::_getLongVolatile : return append_unsafe_get_obj(callee, T_LONG, true);
3195 case vmIntrinsics::_getFloatVolatile : return append_unsafe_get_obj(callee, T_FLOAT, true);
3196 case vmIntrinsics::_getDoubleVolatile : return append_unsafe_get_obj(callee, T_DOUBLE, true);
3198 case vmIntrinsics::_putObjectVolatile : return append_unsafe_put_obj(callee, T_OBJECT, true);
3199 case vmIntrinsics::_putBooleanVolatile: return append_unsafe_put_obj(callee, T_BOOLEAN, true);
3200 case vmIntrinsics::_putByteVolatile : return append_unsafe_put_obj(callee, T_BYTE, true);
3201 case vmIntrinsics::_putShortVolatile : return append_unsafe_put_obj(callee, T_SHORT, true);
3202 case vmIntrinsics::_putCharVolatile : return append_unsafe_put_obj(callee, T_CHAR, true);
3203 case vmIntrinsics::_putIntVolatile : return append_unsafe_put_obj(callee, T_INT, true);
3204 case vmIntrinsics::_putLongVolatile : return append_unsafe_put_obj(callee, T_LONG, true);
3205 case vmIntrinsics::_putFloatVolatile : return append_unsafe_put_obj(callee, T_FLOAT, true);
3206 case vmIntrinsics::_putDoubleVolatile : return append_unsafe_put_obj(callee, T_DOUBLE, true);
3208 case vmIntrinsics::_getByte_raw : return append_unsafe_get_raw(callee, T_BYTE);
3209 case vmIntrinsics::_getShort_raw : return append_unsafe_get_raw(callee, T_SHORT);
3210 case vmIntrinsics::_getChar_raw : return append_unsafe_get_raw(callee, T_CHAR);
3211 case vmIntrinsics::_getInt_raw : return append_unsafe_get_raw(callee, T_INT);
3212 case vmIntrinsics::_getLong_raw : return append_unsafe_get_raw(callee, T_LONG);
3213 case vmIntrinsics::_getFloat_raw : return append_unsafe_get_raw(callee, T_FLOAT);
3214 case vmIntrinsics::_getDouble_raw : return append_unsafe_get_raw(callee, T_DOUBLE);
3216 case vmIntrinsics::_putByte_raw : return append_unsafe_put_raw(callee, T_BYTE);
3217 case vmIntrinsics::_putShort_raw : return append_unsafe_put_raw(callee, T_SHORT);
3218 case vmIntrinsics::_putChar_raw : return append_unsafe_put_raw(callee, T_CHAR);
3219 case vmIntrinsics::_putInt_raw : return append_unsafe_put_raw(callee, T_INT);
3220 case vmIntrinsics::_putLong_raw : return append_unsafe_put_raw(callee, T_LONG);
3221 case vmIntrinsics::_putFloat_raw : return append_unsafe_put_raw(callee, T_FLOAT);
3222 case vmIntrinsics::_putDouble_raw : return append_unsafe_put_raw(callee, T_DOUBLE);
3224 case vmIntrinsics::_prefetchRead : return append_unsafe_prefetch(callee, false, false);
3225 case vmIntrinsics::_prefetchWrite : return append_unsafe_prefetch(callee, false, true);
3226 case vmIntrinsics::_prefetchReadStatic : return append_unsafe_prefetch(callee, true, false);
3227 case vmIntrinsics::_prefetchWriteStatic : return append_unsafe_prefetch(callee, true, true);
3229 case vmIntrinsics::_checkIndex :
3230 if (!InlineNIOCheckIndex) return false;
3231 preserves_state = true;
3232 break;
3233 case vmIntrinsics::_putOrderedObject : return append_unsafe_put_obj(callee, T_OBJECT, true);
3234 case vmIntrinsics::_putOrderedInt : return append_unsafe_put_obj(callee, T_INT, true);
3235 case vmIntrinsics::_putOrderedLong : return append_unsafe_put_obj(callee, T_LONG, true);
3237 case vmIntrinsics::_compareAndSwapLong:
3238 if (!VM_Version::supports_cx8()) return false;
3239 // fall through
3240 case vmIntrinsics::_compareAndSwapInt:
3241 case vmIntrinsics::_compareAndSwapObject:
3242 append_unsafe_CAS(callee);
3243 return true;
3245 case vmIntrinsics::_Reference_get:
3246 // It is only when G1 is enabled that we absolutely
3247 // need to use the intrinsic version of Reference.get()
3248 // so that the value in the referent field, if necessary,
3249 // can be registered by the pre-barrier code.
3250 if (!UseG1GC) return false;
3251 preserves_state = true;
3252 break;
3254 default : return false; // do not inline
3255 }
3256 // create intrinsic node
3257 const bool has_receiver = !callee->is_static();
3258 ValueType* result_type = as_ValueType(callee->return_type());
3259 ValueStack* state_before = copy_state_for_exception();
3261 Values* args = state()->pop_arguments(callee->arg_size());
3263 if (is_profiling()) {
3264 // Don't profile in the special case where the root method
3265 // is the intrinsic
3266 if (callee != method()) {
3267 // Note that we'd collect profile data in this method if we wanted it.
3268 compilation()->set_would_profile(true);
3269 if (profile_calls()) {
3270 Value recv = NULL;
3271 if (has_receiver) {
3272 recv = args->at(0);
3273 null_check(recv);
3274 }
3275 profile_call(recv, NULL);
3276 }
3277 }
3278 }
3280 Intrinsic* result = new Intrinsic(result_type, id, args, has_receiver, state_before,
3281 preserves_state, cantrap);
3282 // append instruction & push result
3283 Value value = append_split(result);
3284 if (result_type != voidType) push(result_type, value);
3286 #ifndef PRODUCT
3287 // printing
3288 if (PrintInlining) {
3289 print_inline_result(callee, true);
3290 }
3291 #endif
3293 // done
3294 return true;
3295 }
3298 bool GraphBuilder::try_inline_jsr(int jsr_dest_bci) {
3299 // Introduce a new callee continuation point - all Ret instructions
3300 // will be replaced with Gotos to this point.
3301 BlockBegin* cont = block_at(next_bci());
3302 assert(cont != NULL, "continuation must exist (BlockListBuilder starts a new block after a jsr");
3304 // Note: can not assign state to continuation yet, as we have to
3305 // pick up the state from the Ret instructions.
3307 // Push callee scope
3308 push_scope_for_jsr(cont, jsr_dest_bci);
3310 // Temporarily set up bytecode stream so we can append instructions
3311 // (only using the bci of this stream)
3312 scope_data()->set_stream(scope_data()->parent()->stream());
3314 BlockBegin* jsr_start_block = block_at(jsr_dest_bci);
3315 assert(jsr_start_block != NULL, "jsr start block must exist");
3316 assert(!jsr_start_block->is_set(BlockBegin::was_visited_flag), "should not have visited jsr yet");
3317 Goto* goto_sub = new Goto(jsr_start_block, false);
3318 // Must copy state to avoid wrong sharing when parsing bytecodes
3319 assert(jsr_start_block->state() == NULL, "should have fresh jsr starting block");
3320 jsr_start_block->set_state(copy_state_before_with_bci(jsr_dest_bci));
3321 append(goto_sub);
3322 _block->set_end(goto_sub);
3323 _last = _block = jsr_start_block;
3325 // Clear out bytecode stream
3326 scope_data()->set_stream(NULL);
3328 scope_data()->add_to_work_list(jsr_start_block);
3330 // Ready to resume parsing in subroutine
3331 iterate_all_blocks();
3333 // If we bailed out during parsing, return immediately (this is bad news)
3334 CHECK_BAILOUT_(false);
3336 // Detect whether the continuation can actually be reached. If not,
3337 // it has not had state set by the join() operations in
3338 // iterate_bytecodes_for_block()/ret() and we should not touch the
3339 // iteration state. The calling activation of
3340 // iterate_bytecodes_for_block will then complete normally.
3341 if (cont->state() != NULL) {
3342 if (!cont->is_set(BlockBegin::was_visited_flag)) {
3343 // add continuation to work list instead of parsing it immediately
3344 scope_data()->parent()->add_to_work_list(cont);
3345 }
3346 }
3348 assert(jsr_continuation() == cont, "continuation must not have changed");
3349 assert(!jsr_continuation()->is_set(BlockBegin::was_visited_flag) ||
3350 jsr_continuation()->is_set(BlockBegin::parser_loop_header_flag),
3351 "continuation can only be visited in case of backward branches");
3352 assert(_last && _last->as_BlockEnd(), "block must have end");
3354 // continuation is in work list, so end iteration of current block
3355 _skip_block = true;
3356 pop_scope_for_jsr();
3358 return true;
3359 }
3362 // Inline the entry of a synchronized method as a monitor enter and
3363 // register the exception handler which releases the monitor if an
3364 // exception is thrown within the callee. Note that the monitor enter
3365 // cannot throw an exception itself, because the receiver is
3366 // guaranteed to be non-null by the explicit null check at the
3367 // beginning of inlining.
3368 void GraphBuilder::inline_sync_entry(Value lock, BlockBegin* sync_handler) {
3369 assert(lock != NULL && sync_handler != NULL, "lock or handler missing");
3371 monitorenter(lock, SynchronizationEntryBCI);
3372 assert(_last->as_MonitorEnter() != NULL, "monitor enter expected");
3373 _last->set_needs_null_check(false);
3375 sync_handler->set(BlockBegin::exception_entry_flag);
3376 sync_handler->set(BlockBegin::is_on_work_list_flag);
3378 ciExceptionHandler* desc = new ciExceptionHandler(method()->holder(), 0, method()->code_size(), -1, 0);
3379 XHandler* h = new XHandler(desc);
3380 h->set_entry_block(sync_handler);
3381 scope_data()->xhandlers()->append(h);
3382 scope_data()->set_has_handler();
3383 }
3386 // If an exception is thrown and not handled within an inlined
3387 // synchronized method, the monitor must be released before the
3388 // exception is rethrown in the outer scope. Generate the appropriate
3389 // instructions here.
3390 void GraphBuilder::fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler) {
3391 BlockBegin* orig_block = _block;
3392 ValueStack* orig_state = _state;
3393 Instruction* orig_last = _last;
3394 _last = _block = sync_handler;
3395 _state = sync_handler->state()->copy();
3397 assert(sync_handler != NULL, "handler missing");
3398 assert(!sync_handler->is_set(BlockBegin::was_visited_flag), "is visited here");
3400 assert(lock != NULL || default_handler, "lock or handler missing");
3402 XHandler* h = scope_data()->xhandlers()->remove_last();
3403 assert(h->entry_block() == sync_handler, "corrupt list of handlers");
3405 block()->set(BlockBegin::was_visited_flag);
3406 Value exception = append_with_bci(new ExceptionObject(), SynchronizationEntryBCI);
3407 assert(exception->is_pinned(), "must be");
3409 int bci = SynchronizationEntryBCI;
3410 if (compilation()->env()->dtrace_method_probes()) {
3411 // Report exit from inline methods. We don't have a stream here
3412 // so pass an explicit bci of SynchronizationEntryBCI.
3413 Values* args = new Values(1);
3414 args->push(append_with_bci(new Constant(new ObjectConstant(method())), bci));
3415 append_with_bci(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args), bci);
3416 }
3418 if (lock) {
3419 assert(state()->locks_size() > 0 && state()->lock_at(state()->locks_size() - 1) == lock, "lock is missing");
3420 if (!lock->is_linked()) {
3421 lock = append_with_bci(lock, bci);
3422 }
3424 // exit the monitor in the context of the synchronized method
3425 monitorexit(lock, bci);
3427 // exit the context of the synchronized method
3428 if (!default_handler) {
3429 pop_scope();
3430 bci = _state->caller_state()->bci();
3431 _state = _state->caller_state()->copy_for_parsing();
3432 }
3433 }
3435 // perform the throw as if at the the call site
3436 apush(exception);
3437 throw_op(bci);
3439 BlockEnd* end = last()->as_BlockEnd();
3440 block()->set_end(end);
3442 _block = orig_block;
3443 _state = orig_state;
3444 _last = orig_last;
3445 }
3448 bool GraphBuilder::try_inline_full(ciMethod* callee, bool holder_known, BlockBegin* cont_block, Value receiver) {
3449 assert(!callee->is_native(), "callee must not be native");
3450 if (CompilationPolicy::policy()->should_not_inline(compilation()->env(), callee)) {
3451 INLINE_BAILOUT("inlining prohibited by policy");
3452 }
3453 // first perform tests of things it's not possible to inline
3454 if (callee->has_exception_handlers() &&
3455 !InlineMethodsWithExceptionHandlers) INLINE_BAILOUT("callee has exception handlers");
3456 if (callee->is_synchronized() &&
3457 !InlineSynchronizedMethods ) INLINE_BAILOUT("callee is synchronized");
3458 if (!callee->holder()->is_initialized()) INLINE_BAILOUT("callee's klass not initialized yet");
3459 if (!callee->has_balanced_monitors()) INLINE_BAILOUT("callee's monitors do not match");
3461 // Proper inlining of methods with jsrs requires a little more work.
3462 if (callee->has_jsrs() ) INLINE_BAILOUT("jsrs not handled properly by inliner yet");
3464 // When SSE2 is used on intel, then no special handling is needed
3465 // for strictfp because the enum-constant is fixed at compile time,
3466 // the check for UseSSE2 is needed here
3467 if (strict_fp_requires_explicit_rounding && UseSSE < 2 && method()->is_strict() != callee->is_strict()) {
3468 INLINE_BAILOUT("caller and callee have different strict fp requirements");
3469 }
3471 if (is_profiling() && !callee->ensure_method_data()) {
3472 INLINE_BAILOUT("mdo allocation failed");
3473 }
3475 // now perform tests that are based on flag settings
3476 if (callee->should_inline()) {
3477 // ignore heuristic controls on inlining
3478 } else {
3479 if (inline_level() > MaxInlineLevel ) INLINE_BAILOUT("too-deep inlining");
3480 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("too-deep recursive inlining");
3481 if (callee->code_size_for_inlining() > max_inline_size() ) INLINE_BAILOUT("callee is too large");
3483 // don't inline throwable methods unless the inlining tree is rooted in a throwable class
3484 if (callee->name() == ciSymbol::object_initializer_name() &&
3485 callee->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
3486 // Throwable constructor call
3487 IRScope* top = scope();
3488 while (top->caller() != NULL) {
3489 top = top->caller();
3490 }
3491 if (!top->method()->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
3492 INLINE_BAILOUT("don't inline Throwable constructors");
3493 }
3494 }
3496 if (compilation()->env()->num_inlined_bytecodes() > DesiredMethodLimit) {
3497 INLINE_BAILOUT("total inlining greater than DesiredMethodLimit");
3498 }
3499 }
3501 #ifndef PRODUCT
3502 // printing
3503 if (PrintInlining) {
3504 print_inline_result(callee, true);
3505 }
3506 #endif
3508 // NOTE: Bailouts from this point on, which occur at the
3509 // GraphBuilder level, do not cause bailout just of the inlining but
3510 // in fact of the entire compilation.
3512 BlockBegin* orig_block = block();
3514 const int args_base = state()->stack_size() - callee->arg_size();
3515 assert(args_base >= 0, "stack underflow during inlining");
3517 // Insert null check if necessary
3518 Value recv = NULL;
3519 if (code() != Bytecodes::_invokestatic &&
3520 code() != Bytecodes::_invokedynamic) {
3521 // note: null check must happen even if first instruction of callee does
3522 // an implicit null check since the callee is in a different scope
3523 // and we must make sure exception handling does the right thing
3524 assert(!callee->is_static(), "callee must not be static");
3525 assert(callee->arg_size() > 0, "must have at least a receiver");
3526 recv = state()->stack_at(args_base);
3527 null_check(recv);
3528 }
3530 if (is_profiling()) {
3531 // Note that we'd collect profile data in this method if we wanted it.
3532 // this may be redundant here...
3533 compilation()->set_would_profile(true);
3535 if (profile_calls()) {
3536 profile_call(recv, holder_known ? callee->holder() : NULL);
3537 }
3538 }
3540 // Introduce a new callee continuation point - if the callee has
3541 // more than one return instruction or the return does not allow
3542 // fall-through of control flow, all return instructions of the
3543 // callee will need to be replaced by Goto's pointing to this
3544 // continuation point.
3545 BlockBegin* cont = cont_block != NULL ? cont_block : block_at(next_bci());
3546 bool continuation_existed = true;
3547 if (cont == NULL) {
3548 cont = new BlockBegin(next_bci());
3549 // low number so that continuation gets parsed as early as possible
3550 cont->set_depth_first_number(0);
3551 #ifndef PRODUCT
3552 if (PrintInitialBlockList) {
3553 tty->print_cr("CFG: created block %d (bci %d) as continuation for inline at bci %d",
3554 cont->block_id(), cont->bci(), bci());
3555 }
3556 #endif
3557 continuation_existed = false;
3558 }
3559 // Record number of predecessors of continuation block before
3560 // inlining, to detect if inlined method has edges to its
3561 // continuation after inlining.
3562 int continuation_preds = cont->number_of_preds();
3564 // Push callee scope
3565 push_scope(callee, cont);
3567 // the BlockListBuilder for the callee could have bailed out
3568 CHECK_BAILOUT_(false);
3570 // Temporarily set up bytecode stream so we can append instructions
3571 // (only using the bci of this stream)
3572 scope_data()->set_stream(scope_data()->parent()->stream());
3574 // Pass parameters into callee state: add assignments
3575 // note: this will also ensure that all arguments are computed before being passed
3576 ValueStack* callee_state = state();
3577 ValueStack* caller_state = state()->caller_state();
3578 { int i = args_base;
3579 while (i < caller_state->stack_size()) {
3580 const int par_no = i - args_base;
3581 Value arg = caller_state->stack_at_inc(i);
3582 // NOTE: take base() of arg->type() to avoid problems storing
3583 // constants
3584 if (receiver != NULL && par_no == 0) {
3585 arg = receiver;
3586 }
3587 store_local(callee_state, arg, arg->type()->base(), par_no);
3588 }
3589 }
3591 // Remove args from stack.
3592 // Note that we preserve locals state in case we can use it later
3593 // (see use of pop_scope() below)
3594 caller_state->truncate_stack(args_base);
3595 assert(callee_state->stack_size() == 0, "callee stack must be empty");
3597 Value lock;
3598 BlockBegin* sync_handler;
3600 // Inline the locking of the receiver if the callee is synchronized
3601 if (callee->is_synchronized()) {
3602 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror())))
3603 : state()->local_at(0);
3604 sync_handler = new BlockBegin(SynchronizationEntryBCI);
3605 inline_sync_entry(lock, sync_handler);
3606 }
3608 if (compilation()->env()->dtrace_method_probes()) {
3609 Values* args = new Values(1);
3610 args->push(append(new Constant(new ObjectConstant(method()))));
3611 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args));
3612 }
3614 if (profile_inlined_calls()) {
3615 profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI));
3616 }
3618 BlockBegin* callee_start_block = block_at(0);
3619 if (callee_start_block != NULL) {
3620 assert(callee_start_block->is_set(BlockBegin::parser_loop_header_flag), "must be loop header");
3621 Goto* goto_callee = new Goto(callee_start_block, false);
3622 // The state for this goto is in the scope of the callee, so use
3623 // the entry bci for the callee instead of the call site bci.
3624 append_with_bci(goto_callee, 0);
3625 _block->set_end(goto_callee);
3626 callee_start_block->merge(callee_state);
3628 _last = _block = callee_start_block;
3630 scope_data()->add_to_work_list(callee_start_block);
3631 }
3633 // Clear out bytecode stream
3634 scope_data()->set_stream(NULL);
3636 // Ready to resume parsing in callee (either in the same block we
3637 // were in before or in the callee's start block)
3638 iterate_all_blocks(callee_start_block == NULL);
3640 // If we bailed out during parsing, return immediately (this is bad news)
3641 if (bailed_out()) return false;
3643 // iterate_all_blocks theoretically traverses in random order; in
3644 // practice, we have only traversed the continuation if we are
3645 // inlining into a subroutine
3646 assert(continuation_existed ||
3647 !continuation()->is_set(BlockBegin::was_visited_flag),
3648 "continuation should not have been parsed yet if we created it");
3650 // If we bailed out during parsing, return immediately (this is bad news)
3651 CHECK_BAILOUT_(false);
3653 // At this point we are almost ready to return and resume parsing of
3654 // the caller back in the GraphBuilder. The only thing we want to do
3655 // first is an optimization: during parsing of the callee we
3656 // generated at least one Goto to the continuation block. If we
3657 // generated exactly one, and if the inlined method spanned exactly
3658 // one block (and we didn't have to Goto its entry), then we snip
3659 // off the Goto to the continuation, allowing control to fall
3660 // through back into the caller block and effectively performing
3661 // block merging. This allows load elimination and CSE to take place
3662 // across multiple callee scopes if they are relatively simple, and
3663 // is currently essential to making inlining profitable.
3664 if (cont_block == NULL) {
3665 if (num_returns() == 1
3666 && block() == orig_block
3667 && block() == inline_cleanup_block()) {
3668 _last = inline_cleanup_return_prev();
3669 _state = inline_cleanup_state();
3670 } else if (continuation_preds == cont->number_of_preds()) {
3671 // Inlining caused that the instructions after the invoke in the
3672 // caller are not reachable any more. So skip filling this block
3673 // with instructions!
3674 assert(cont == continuation(), "");
3675 assert(_last && _last->as_BlockEnd(), "");
3676 _skip_block = true;
3677 } else {
3678 // Resume parsing in continuation block unless it was already parsed.
3679 // Note that if we don't change _last here, iteration in
3680 // iterate_bytecodes_for_block will stop when we return.
3681 if (!continuation()->is_set(BlockBegin::was_visited_flag)) {
3682 // add continuation to work list instead of parsing it immediately
3683 assert(_last && _last->as_BlockEnd(), "");
3684 scope_data()->parent()->add_to_work_list(continuation());
3685 _skip_block = true;
3686 }
3687 }
3688 }
3690 // Fill the exception handler for synchronized methods with instructions
3691 if (callee->is_synchronized() && sync_handler->state() != NULL) {
3692 fill_sync_handler(lock, sync_handler);
3693 } else {
3694 pop_scope();
3695 }
3697 compilation()->notice_inlined_method(callee);
3699 return true;
3700 }
3703 bool GraphBuilder::for_method_handle_inline(ciMethod* callee) {
3704 assert(!callee->is_static(), "change next line");
3705 int index = state()->stack_size() - (callee->arg_size_no_receiver() + 1);
3706 Value receiver = state()->stack_at(index);
3708 if (receiver->type()->is_constant()) {
3709 ciMethodHandle* method_handle = receiver->type()->as_ObjectType()->constant_value()->as_method_handle();
3711 // Set the callee to have access to the class and signature in
3712 // the MethodHandleCompiler.
3713 method_handle->set_callee(callee);
3714 method_handle->set_caller(method());
3716 // Get an adapter for the MethodHandle.
3717 ciMethod* method_handle_adapter = method_handle->get_method_handle_adapter();
3718 if (method_handle_adapter != NULL) {
3719 return try_inline(method_handle_adapter, /*holder_known=*/ true);
3720 }
3721 } else if (receiver->as_CheckCast()) {
3722 // Match MethodHandle.selectAlternative idiom
3723 Phi* phi = receiver->as_CheckCast()->obj()->as_Phi();
3725 if (phi != NULL && phi->operand_count() == 2) {
3726 // Get the two MethodHandle inputs from the Phi.
3727 Value op1 = phi->operand_at(0);
3728 Value op2 = phi->operand_at(1);
3729 ObjectType* op1type = op1->type()->as_ObjectType();
3730 ObjectType* op2type = op2->type()->as_ObjectType();
3732 if (op1type->is_constant() && op2type->is_constant()) {
3733 ciMethodHandle* mh1 = op1type->constant_value()->as_method_handle();
3734 ciMethodHandle* mh2 = op2type->constant_value()->as_method_handle();
3736 // Set the callee to have access to the class and signature in
3737 // the MethodHandleCompiler.
3738 mh1->set_callee(callee);
3739 mh1->set_caller(method());
3740 mh2->set_callee(callee);
3741 mh2->set_caller(method());
3743 // Get adapters for the MethodHandles.
3744 ciMethod* mh1_adapter = mh1->get_method_handle_adapter();
3745 ciMethod* mh2_adapter = mh2->get_method_handle_adapter();
3747 if (mh1_adapter != NULL && mh2_adapter != NULL) {
3748 set_inline_cleanup_info();
3750 // Build the If guard
3751 BlockBegin* one = new BlockBegin(next_bci());
3752 BlockBegin* two = new BlockBegin(next_bci());
3753 BlockBegin* end = new BlockBegin(next_bci());
3754 Instruction* iff = append(new If(phi, If::eql, false, op1, one, two, NULL, false));
3755 block()->set_end(iff->as_BlockEnd());
3757 // Connect up the states
3758 one->merge(block()->end()->state());
3759 two->merge(block()->end()->state());
3761 // Save the state for the second inlinee
3762 ValueStack* state_before = copy_state_before();
3764 // Parse first adapter
3765 _last = _block = one;
3766 if (!try_inline_full(mh1_adapter, /*holder_known=*/ true, end, NULL)) {
3767 restore_inline_cleanup_info();
3768 block()->clear_end(); // remove appended iff
3769 return false;
3770 }
3772 // Parse second adapter
3773 _last = _block = two;
3774 _state = state_before;
3775 if (!try_inline_full(mh2_adapter, /*holder_known=*/ true, end, NULL)) {
3776 restore_inline_cleanup_info();
3777 block()->clear_end(); // remove appended iff
3778 return false;
3779 }
3781 connect_to_end(end);
3782 return true;
3783 }
3784 }
3785 }
3786 }
3787 return false;
3788 }
3791 bool GraphBuilder::for_invokedynamic_inline(ciMethod* callee) {
3792 // Get the MethodHandle from the CallSite.
3793 ciCallSite* call_site = stream()->get_call_site();
3794 ciMethodHandle* method_handle = call_site->get_target();
3796 // Set the callee to have access to the class and signature in the
3797 // MethodHandleCompiler.
3798 method_handle->set_callee(callee);
3799 method_handle->set_caller(method());
3801 // Get an adapter for the MethodHandle.
3802 ciMethod* method_handle_adapter = method_handle->get_invokedynamic_adapter();
3803 if (method_handle_adapter != NULL) {
3804 if (try_inline(method_handle_adapter, /*holder_known=*/ true)) {
3805 // Add a dependence for invalidation of the optimization.
3806 if (!call_site->is_constant_call_site()) {
3807 dependency_recorder()->assert_call_site_target_value(call_site, method_handle);
3808 }
3809 return true;
3810 }
3811 }
3812 return false;
3813 }
3816 void GraphBuilder::inline_bailout(const char* msg) {
3817 assert(msg != NULL, "inline bailout msg must exist");
3818 _inline_bailout_msg = msg;
3819 }
3822 void GraphBuilder::clear_inline_bailout() {
3823 _inline_bailout_msg = NULL;
3824 }
3827 void GraphBuilder::push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start) {
3828 ScopeData* data = new ScopeData(NULL);
3829 data->set_scope(scope);
3830 data->set_bci2block(bci2block);
3831 _scope_data = data;
3832 _block = start;
3833 }
3836 void GraphBuilder::push_scope(ciMethod* callee, BlockBegin* continuation) {
3837 IRScope* callee_scope = new IRScope(compilation(), scope(), bci(), callee, -1, false);
3838 scope()->add_callee(callee_scope);
3840 BlockListBuilder blb(compilation(), callee_scope, -1);
3841 CHECK_BAILOUT();
3843 if (!blb.bci2block()->at(0)->is_set(BlockBegin::parser_loop_header_flag)) {
3844 // this scope can be inlined directly into the caller so remove
3845 // the block at bci 0.
3846 blb.bci2block()->at_put(0, NULL);
3847 }
3849 set_state(new ValueStack(callee_scope, state()->copy(ValueStack::CallerState, bci())));
3851 ScopeData* data = new ScopeData(scope_data());
3852 data->set_scope(callee_scope);
3853 data->set_bci2block(blb.bci2block());
3854 data->set_continuation(continuation);
3855 _scope_data = data;
3856 }
3859 void GraphBuilder::push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci) {
3860 ScopeData* data = new ScopeData(scope_data());
3861 data->set_parsing_jsr();
3862 data->set_jsr_entry_bci(jsr_dest_bci);
3863 data->set_jsr_return_address_local(-1);
3864 // Must clone bci2block list as we will be mutating it in order to
3865 // properly clone all blocks in jsr region as well as exception
3866 // handlers containing rets
3867 BlockList* new_bci2block = new BlockList(bci2block()->length());
3868 new_bci2block->push_all(bci2block());
3869 data->set_bci2block(new_bci2block);
3870 data->set_scope(scope());
3871 data->setup_jsr_xhandlers();
3872 data->set_continuation(continuation());
3873 data->set_jsr_continuation(jsr_continuation);
3874 _scope_data = data;
3875 }
3878 void GraphBuilder::pop_scope() {
3879 int number_of_locks = scope()->number_of_locks();
3880 _scope_data = scope_data()->parent();
3881 // accumulate minimum number of monitor slots to be reserved
3882 scope()->set_min_number_of_locks(number_of_locks);
3883 }
3886 void GraphBuilder::pop_scope_for_jsr() {
3887 _scope_data = scope_data()->parent();
3888 }
3890 bool GraphBuilder::append_unsafe_get_obj(ciMethod* callee, BasicType t, bool is_volatile) {
3891 if (InlineUnsafeOps) {
3892 Values* args = state()->pop_arguments(callee->arg_size());
3893 null_check(args->at(0));
3894 Instruction* offset = args->at(2);
3895 #ifndef _LP64
3896 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
3897 #endif
3898 Instruction* op = append(new UnsafeGetObject(t, args->at(1), offset, is_volatile));
3899 push(op->type(), op);
3900 compilation()->set_has_unsafe_access(true);
3901 }
3902 return InlineUnsafeOps;
3903 }
3906 bool GraphBuilder::append_unsafe_put_obj(ciMethod* callee, BasicType t, bool is_volatile) {
3907 if (InlineUnsafeOps) {
3908 Values* args = state()->pop_arguments(callee->arg_size());
3909 null_check(args->at(0));
3910 Instruction* offset = args->at(2);
3911 #ifndef _LP64
3912 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
3913 #endif
3914 Instruction* op = append(new UnsafePutObject(t, args->at(1), offset, args->at(3), is_volatile));
3915 compilation()->set_has_unsafe_access(true);
3916 kill_all();
3917 }
3918 return InlineUnsafeOps;
3919 }
3922 bool GraphBuilder::append_unsafe_get_raw(ciMethod* callee, BasicType t) {
3923 if (InlineUnsafeOps) {
3924 Values* args = state()->pop_arguments(callee->arg_size());
3925 null_check(args->at(0));
3926 Instruction* op = append(new UnsafeGetRaw(t, args->at(1), false));
3927 push(op->type(), op);
3928 compilation()->set_has_unsafe_access(true);
3929 }
3930 return InlineUnsafeOps;
3931 }
3934 bool GraphBuilder::append_unsafe_put_raw(ciMethod* callee, BasicType t) {
3935 if (InlineUnsafeOps) {
3936 Values* args = state()->pop_arguments(callee->arg_size());
3937 null_check(args->at(0));
3938 Instruction* op = append(new UnsafePutRaw(t, args->at(1), args->at(2)));
3939 compilation()->set_has_unsafe_access(true);
3940 }
3941 return InlineUnsafeOps;
3942 }
3945 bool GraphBuilder::append_unsafe_prefetch(ciMethod* callee, bool is_static, bool is_store) {
3946 if (InlineUnsafeOps) {
3947 Values* args = state()->pop_arguments(callee->arg_size());
3948 int obj_arg_index = 1; // Assume non-static case
3949 if (is_static) {
3950 obj_arg_index = 0;
3951 } else {
3952 null_check(args->at(0));
3953 }
3954 Instruction* offset = args->at(obj_arg_index + 1);
3955 #ifndef _LP64
3956 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
3957 #endif
3958 Instruction* op = is_store ? append(new UnsafePrefetchWrite(args->at(obj_arg_index), offset))
3959 : append(new UnsafePrefetchRead (args->at(obj_arg_index), offset));
3960 compilation()->set_has_unsafe_access(true);
3961 }
3962 return InlineUnsafeOps;
3963 }
3966 void GraphBuilder::append_unsafe_CAS(ciMethod* callee) {
3967 ValueStack* state_before = copy_state_for_exception();
3968 ValueType* result_type = as_ValueType(callee->return_type());
3969 assert(result_type->is_int(), "int result");
3970 Values* args = state()->pop_arguments(callee->arg_size());
3972 // Pop off some args to speically handle, then push back
3973 Value newval = args->pop();
3974 Value cmpval = args->pop();
3975 Value offset = args->pop();
3976 Value src = args->pop();
3977 Value unsafe_obj = args->pop();
3979 // Separately handle the unsafe arg. It is not needed for code
3980 // generation, but must be null checked
3981 null_check(unsafe_obj);
3983 #ifndef _LP64
3984 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
3985 #endif
3987 args->push(src);
3988 args->push(offset);
3989 args->push(cmpval);
3990 args->push(newval);
3992 // An unsafe CAS can alias with other field accesses, but we don't
3993 // know which ones so mark the state as no preserved. This will
3994 // cause CSE to invalidate memory across it.
3995 bool preserves_state = false;
3996 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), args, false, state_before, preserves_state);
3997 append_split(result);
3998 push(result_type, result);
3999 compilation()->set_has_unsafe_access(true);
4000 }
4003 #ifndef PRODUCT
4004 void GraphBuilder::print_inline_result(ciMethod* callee, bool res) {
4005 CompileTask::print_inlining(callee, scope()->level(), bci(), _inline_bailout_msg);
4006 if (res && CIPrintMethodCodes) {
4007 callee->print_codes();
4008 }
4009 }
4012 void GraphBuilder::print_stats() {
4013 vmap()->print();
4014 }
4015 #endif // PRODUCT
4017 void GraphBuilder::profile_call(Value recv, ciKlass* known_holder) {
4018 append(new ProfileCall(method(), bci(), recv, known_holder));
4019 }
4021 void GraphBuilder::profile_invocation(ciMethod* callee, ValueStack* state) {
4022 append(new ProfileInvoke(callee, state));
4023 }