1 /*
2 * Copyright (c) 1998, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/ciMethodData.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "compiler/compileLog.hpp"
29 #include "interpreter/linkResolver.hpp"
30 #include "jvm_io.h"
31 #include "memory/resourceArea.hpp"
32 #include "memory/universe.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "opto/addnode.hpp"
35 #include "opto/castnode.hpp"
36 #include "opto/convertnode.hpp"
37 #include "opto/divnode.hpp"
38 #include "opto/idealGraphPrinter.hpp"
39 #include "opto/matcher.hpp"
40 #include "opto/memnode.hpp"
41 #include "opto/mulnode.hpp"
42 #include "opto/opaquenode.hpp"
43 #include "opto/parse.hpp"
44 #include "opto/runtime.hpp"
45 #include "runtime/deoptimization.hpp"
46 #include "runtime/sharedRuntime.hpp"
47
48 #ifndef PRODUCT
49 extern int explicit_null_checks_inserted,
50 explicit_null_checks_elided;
51 #endif
52
53 //---------------------------------array_load----------------------------------
54 void Parse::array_load(BasicType bt) {
55 const Type* elemtype = Type::TOP;
56 bool big_val = bt == T_DOUBLE || bt == T_LONG;
57 Node* adr = array_addressing(bt, 0, elemtype);
58 if (stopped()) return; // guaranteed null or range check
59
60 pop(); // index (already used)
61 Node* array = pop(); // the array itself
62
63 if (elemtype == TypeInt::BOOL) {
64 bt = T_BOOLEAN;
65 }
66 const TypeAryPtr* adr_type = TypeAryPtr::get_array_body_type(bt);
67
68 Node* ld = access_load_at(array, adr, adr_type, elemtype, bt,
69 IN_HEAP | IS_ARRAY | C2_CONTROL_DEPENDENT_LOAD);
70 if (big_val) {
71 push_pair(ld);
72 } else {
73 push(ld);
74 }
75 }
76
77
78 //--------------------------------array_store----------------------------------
79 void Parse::array_store(BasicType bt) {
80 const Type* elemtype = Type::TOP;
81 bool big_val = bt == T_DOUBLE || bt == T_LONG;
82 Node* adr = array_addressing(bt, big_val ? 2 : 1, elemtype);
83 if (stopped()) return; // guaranteed null or range check
84 if (bt == T_OBJECT) {
85 array_store_check();
86 if (stopped()) {
87 return;
88 }
89 }
90 Node* val; // Oop to store
91 if (big_val) {
92 val = pop_pair();
93 } else {
94 val = pop();
95 }
96 pop(); // index (already used)
97 Node* array = pop(); // the array itself
98
99 if (elemtype == TypeInt::BOOL) {
100 bt = T_BOOLEAN;
101 }
102 const TypeAryPtr* adr_type = TypeAryPtr::get_array_body_type(bt);
103
104 access_store_at(array, adr, adr_type, val, elemtype, bt, MO_UNORDERED | IN_HEAP | IS_ARRAY);
105 }
106
107
108 //------------------------------array_addressing-------------------------------
109 // Pull array and index from the stack. Compute pointer-to-element.
110 Node* Parse::array_addressing(BasicType type, int vals, const Type*& elemtype) {
111 Node *idx = peek(0+vals); // Get from stack without popping
112 Node *ary = peek(1+vals); // in case of exception
113
114 // Null check the array base, with correct stack contents
115 ary = null_check(ary, T_ARRAY);
116 // Compile-time detect of null-exception?
117 if (stopped()) return top();
118
119 const TypeAryPtr* arytype = _gvn.type(ary)->is_aryptr();
120 const TypeInt* sizetype = arytype->size();
121 elemtype = arytype->elem();
122
123 if (UseUniqueSubclasses) {
124 const Type* el = elemtype->make_ptr();
125 if (el && el->isa_instptr()) {
126 const TypeInstPtr* toop = el->is_instptr();
127 if (toop->instance_klass()->unique_concrete_subklass()) {
128 // If we load from "AbstractClass[]" we must see "ConcreteSubClass".
129 const Type* subklass = Type::get_const_type(toop->instance_klass());
130 elemtype = subklass->join_speculative(el);
131 }
132 }
133 }
134
135 // Check for big class initializers with all constant offsets
136 // feeding into a known-size array.
137 const TypeInt* idxtype = _gvn.type(idx)->is_int();
138 // See if the highest idx value is less than the lowest array bound,
139 // and if the idx value cannot be negative:
140 bool need_range_check = true;
141 if (idxtype->_hi < sizetype->_lo && idxtype->_lo >= 0) {
142 need_range_check = false;
143 if (C->log() != nullptr) C->log()->elem("observe that='!need_range_check'");
144 }
145
146 if (!arytype->is_loaded()) {
147 // Only fails for some -Xcomp runs
148 // The class is unloaded. We have to run this bytecode in the interpreter.
149 ciKlass* klass = arytype->unloaded_klass();
150
151 uncommon_trap(Deoptimization::Reason_unloaded,
152 Deoptimization::Action_reinterpret,
153 klass, "!loaded array");
154 return top();
155 }
156
157 // Do the range check
158 if (need_range_check) {
159 Node* tst;
160 if (sizetype->_hi <= 0) {
161 // The greatest array bound is negative, so we can conclude that we're
162 // compiling unreachable code, but the unsigned compare trick used below
163 // only works with non-negative lengths. Instead, hack "tst" to be zero so
164 // the uncommon_trap path will always be taken.
165 tst = _gvn.intcon(0);
166 } else {
167 // Range is constant in array-oop, so we can use the original state of mem
168 Node* len = load_array_length(ary);
169
170 // Test length vs index (standard trick using unsigned compare)
171 Node* chk = _gvn.transform( new CmpUNode(idx, len) );
172 BoolTest::mask btest = BoolTest::lt;
173 tst = _gvn.transform( new BoolNode(chk, btest) );
174 }
175 RangeCheckNode* rc = new RangeCheckNode(control(), tst, PROB_MAX, COUNT_UNKNOWN);
176 _gvn.set_type(rc, rc->Value(&_gvn));
177 if (!tst->is_Con()) {
178 record_for_igvn(rc);
179 }
180 set_control(_gvn.transform(new IfTrueNode(rc)));
181 // Branch to failure if out of bounds
182 {
183 PreserveJVMState pjvms(this);
184 set_control(_gvn.transform(new IfFalseNode(rc)));
185 if (C->allow_range_check_smearing()) {
186 // Do not use builtin_throw, since range checks are sometimes
187 // made more stringent by an optimistic transformation.
188 // This creates "tentative" range checks at this point,
189 // which are not guaranteed to throw exceptions.
190 // See IfNode::Ideal, is_range_check, adjust_check.
191 uncommon_trap(Deoptimization::Reason_range_check,
192 Deoptimization::Action_make_not_entrant,
193 nullptr, "range_check");
194 } else {
195 // If we have already recompiled with the range-check-widening
196 // heroic optimization turned off, then we must really be throwing
197 // range check exceptions.
198 builtin_throw(Deoptimization::Reason_range_check);
199 }
200 }
201 }
202 // Check for always knowing you are throwing a range-check exception
203 if (stopped()) return top();
204
205 // Make array address computation control dependent to prevent it
206 // from floating above the range check during loop optimizations.
207 Node* ptr = array_element_address(ary, idx, type, sizetype, control());
208 assert(ptr != top(), "top should go hand-in-hand with stopped");
209
210 return ptr;
211 }
212
213
214 // returns IfNode
215 IfNode* Parse::jump_if_fork_int(Node* a, Node* b, BoolTest::mask mask, float prob, float cnt) {
216 Node *cmp = _gvn.transform(new CmpINode(a, b)); // two cases: shiftcount > 32 and shiftcount <= 32
217 Node *tst = _gvn.transform(new BoolNode(cmp, mask));
218 IfNode *iff = create_and_map_if(control(), tst, prob, cnt);
219 return iff;
220 }
221
222
223 // sentinel value for the target bci to mark never taken branches
224 // (according to profiling)
225 static const int never_reached = INT_MAX;
226
227 //------------------------------helper for tableswitch-------------------------
228 void Parse::jump_if_true_fork(IfNode *iff, int dest_bci_if_true, bool unc) {
229 // True branch, use existing map info
230 { PreserveJVMState pjvms(this);
231 Node *iftrue = _gvn.transform( new IfTrueNode (iff) );
232 set_control( iftrue );
233 if (unc) {
234 repush_if_args();
235 uncommon_trap(Deoptimization::Reason_unstable_if,
236 Deoptimization::Action_reinterpret,
237 nullptr,
238 "taken always");
239 } else {
240 assert(dest_bci_if_true != never_reached, "inconsistent dest");
241 merge_new_path(dest_bci_if_true);
242 }
243 }
244
245 // False branch
246 Node *iffalse = _gvn.transform( new IfFalseNode(iff) );
247 set_control( iffalse );
248 }
249
250 void Parse::jump_if_false_fork(IfNode *iff, int dest_bci_if_true, bool unc) {
251 // True branch, use existing map info
252 { PreserveJVMState pjvms(this);
253 Node *iffalse = _gvn.transform( new IfFalseNode (iff) );
254 set_control( iffalse );
255 if (unc) {
256 repush_if_args();
257 uncommon_trap(Deoptimization::Reason_unstable_if,
258 Deoptimization::Action_reinterpret,
259 nullptr,
260 "taken never");
261 } else {
262 assert(dest_bci_if_true != never_reached, "inconsistent dest");
263 merge_new_path(dest_bci_if_true);
264 }
265 }
266
267 // False branch
268 Node *iftrue = _gvn.transform( new IfTrueNode(iff) );
269 set_control( iftrue );
270 }
271
272 void Parse::jump_if_always_fork(int dest_bci, bool unc) {
273 // False branch, use existing map and control()
274 if (unc) {
275 repush_if_args();
276 uncommon_trap(Deoptimization::Reason_unstable_if,
277 Deoptimization::Action_reinterpret,
278 nullptr,
279 "taken never");
280 } else {
281 assert(dest_bci != never_reached, "inconsistent dest");
282 merge_new_path(dest_bci);
283 }
284 }
285
286
287 extern "C" {
288 static int jint_cmp(const void *i, const void *j) {
289 int a = *(jint *)i;
290 int b = *(jint *)j;
291 return a > b ? 1 : a < b ? -1 : 0;
292 }
293 }
294
295
296 class SwitchRange : public StackObj {
297 // a range of integers coupled with a bci destination
298 jint _lo; // inclusive lower limit
299 jint _hi; // inclusive upper limit
300 int _dest;
301 float _cnt; // how many times this range was hit according to profiling
302
303 public:
304 jint lo() const { return _lo; }
305 jint hi() const { return _hi; }
306 int dest() const { return _dest; }
307 bool is_singleton() const { return _lo == _hi; }
308 float cnt() const { return _cnt; }
309
310 void setRange(jint lo, jint hi, int dest, float cnt) {
311 assert(lo <= hi, "must be a non-empty range");
312 _lo = lo, _hi = hi; _dest = dest; _cnt = cnt;
313 assert(_cnt >= 0, "");
314 }
315 bool adjoinRange(jint lo, jint hi, int dest, float cnt, bool trim_ranges) {
316 assert(lo <= hi, "must be a non-empty range");
317 if (lo == _hi+1) {
318 // see merge_ranges() comment below
319 if (trim_ranges) {
320 if (cnt == 0) {
321 if (_cnt != 0) {
322 return false;
323 }
324 if (dest != _dest) {
325 _dest = never_reached;
326 }
327 } else {
328 if (_cnt == 0) {
329 return false;
330 }
331 if (dest != _dest) {
332 return false;
333 }
334 }
335 } else {
336 if (dest != _dest) {
337 return false;
338 }
339 }
340 _hi = hi;
341 _cnt += cnt;
342 return true;
343 }
344 return false;
345 }
346
347 void set (jint value, int dest, float cnt) {
348 setRange(value, value, dest, cnt);
349 }
350 bool adjoin(jint value, int dest, float cnt, bool trim_ranges) {
351 return adjoinRange(value, value, dest, cnt, trim_ranges);
352 }
353 bool adjoin(SwitchRange& other) {
354 return adjoinRange(other._lo, other._hi, other._dest, other._cnt, false);
355 }
356
357 void print() {
358 if (is_singleton())
359 tty->print(" {%d}=>%d (cnt=%f)", lo(), dest(), cnt());
360 else if (lo() == min_jint)
361 tty->print(" {..%d}=>%d (cnt=%f)", hi(), dest(), cnt());
362 else if (hi() == max_jint)
363 tty->print(" {%d..}=>%d (cnt=%f)", lo(), dest(), cnt());
364 else
365 tty->print(" {%d..%d}=>%d (cnt=%f)", lo(), hi(), dest(), cnt());
366 }
367 };
368
369 // We try to minimize the number of ranges and the size of the taken
370 // ones using profiling data. When ranges are created,
371 // SwitchRange::adjoinRange() only allows 2 adjoining ranges to merge
372 // if both were never hit or both were hit to build longer unreached
373 // ranges. Here, we now merge adjoining ranges with the same
374 // destination and finally set destination of unreached ranges to the
375 // special value never_reached because it can help minimize the number
376 // of tests that are necessary.
377 //
378 // For instance:
379 // [0, 1] to target1 sometimes taken
380 // [1, 2] to target1 never taken
381 // [2, 3] to target2 never taken
382 // would lead to:
383 // [0, 1] to target1 sometimes taken
384 // [1, 3] never taken
385 //
386 // (first 2 ranges to target1 are not merged)
387 static void merge_ranges(SwitchRange* ranges, int& rp) {
388 if (rp == 0) {
389 return;
390 }
391 int shift = 0;
392 for (int j = 0; j < rp; j++) {
393 SwitchRange& r1 = ranges[j-shift];
394 SwitchRange& r2 = ranges[j+1];
395 if (r1.adjoin(r2)) {
396 shift++;
397 } else if (shift > 0) {
398 ranges[j+1-shift] = r2;
399 }
400 }
401 rp -= shift;
402 for (int j = 0; j <= rp; j++) {
403 SwitchRange& r = ranges[j];
404 if (r.cnt() == 0 && r.dest() != never_reached) {
405 r.setRange(r.lo(), r.hi(), never_reached, r.cnt());
406 }
407 }
408 }
409
410 //-------------------------------do_tableswitch--------------------------------
411 void Parse::do_tableswitch() {
412 // Get information about tableswitch
413 int default_dest = iter().get_dest_table(0);
414 jint lo_index = iter().get_int_table(1);
415 jint hi_index = iter().get_int_table(2);
416 int len = hi_index - lo_index + 1;
417
418 if (len < 1) {
419 // If this is a backward branch, add safepoint
420 maybe_add_safepoint(default_dest);
421 pop(); // the effect of the instruction execution on the operand stack
422 merge(default_dest);
423 return;
424 }
425
426 ciMethodData* methodData = method()->method_data();
427 ciMultiBranchData* profile = nullptr;
428 if (methodData->is_mature() && UseSwitchProfiling) {
429 ciProfileData* data = methodData->bci_to_data(bci());
430 if (data != nullptr && data->is_MultiBranchData()) {
431 profile = (ciMultiBranchData*)data;
432 }
433 }
434 bool trim_ranges = !C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if);
435
436 // generate decision tree, using trichotomy when possible
437 int rnum = len+2;
438 bool makes_backward_branch = (default_dest <= bci());
439 SwitchRange* ranges = NEW_RESOURCE_ARRAY(SwitchRange, rnum);
440 int rp = -1;
441 if (lo_index != min_jint) {
442 float cnt = 1.0F;
443 if (profile != nullptr) {
444 cnt = (float)profile->default_count() / (hi_index != max_jint ? 2.0F : 1.0F);
445 }
446 ranges[++rp].setRange(min_jint, lo_index-1, default_dest, cnt);
447 }
448 for (int j = 0; j < len; j++) {
449 jint match_int = lo_index+j;
450 int dest = iter().get_dest_table(j+3);
451 makes_backward_branch |= (dest <= bci());
452 float cnt = 1.0F;
453 if (profile != nullptr) {
454 cnt = (float)profile->count_at(j);
455 }
456 if (rp < 0 || !ranges[rp].adjoin(match_int, dest, cnt, trim_ranges)) {
457 ranges[++rp].set(match_int, dest, cnt);
458 }
459 }
460 jint highest = lo_index+(len-1);
461 assert(ranges[rp].hi() == highest, "");
462 if (highest != max_jint) {
463 float cnt = 1.0F;
464 if (profile != nullptr) {
465 cnt = (float)profile->default_count() / (lo_index != min_jint ? 2.0F : 1.0F);
466 }
467 if (!ranges[rp].adjoinRange(highest+1, max_jint, default_dest, cnt, trim_ranges)) {
468 ranges[++rp].setRange(highest+1, max_jint, default_dest, cnt);
469 }
470 }
471 assert(rp < len+2, "not too many ranges");
472
473 if (trim_ranges) {
474 merge_ranges(ranges, rp);
475 }
476
477 // Safepoint in case if backward branch observed
478 if (makes_backward_branch) {
479 add_safepoint();
480 }
481
482 Node* lookup = pop(); // lookup value
483 jump_switch_ranges(lookup, &ranges[0], &ranges[rp]);
484 }
485
486
487 //------------------------------do_lookupswitch--------------------------------
488 void Parse::do_lookupswitch() {
489 // Get information about lookupswitch
490 int default_dest = iter().get_dest_table(0);
491 jint len = iter().get_int_table(1);
492
493 if (len < 1) { // If this is a backward branch, add safepoint
494 maybe_add_safepoint(default_dest);
495 pop(); // the effect of the instruction execution on the operand stack
496 merge(default_dest);
497 return;
498 }
499
500 ciMethodData* methodData = method()->method_data();
501 ciMultiBranchData* profile = nullptr;
502 if (methodData->is_mature() && UseSwitchProfiling) {
503 ciProfileData* data = methodData->bci_to_data(bci());
504 if (data != nullptr && data->is_MultiBranchData()) {
505 profile = (ciMultiBranchData*)data;
506 }
507 }
508 bool trim_ranges = !C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if);
509
510 // generate decision tree, using trichotomy when possible
511 jint* table = NEW_RESOURCE_ARRAY(jint, len*3);
512 {
513 for (int j = 0; j < len; j++) {
514 table[3*j+0] = iter().get_int_table(2+2*j);
515 table[3*j+1] = iter().get_dest_table(2+2*j+1);
516 // Handle overflow when converting from uint to jint
517 table[3*j+2] = (profile == nullptr) ? 1 : (jint)MIN2<uint>((uint)max_jint, profile->count_at(j));
518 }
519 qsort(table, len, 3*sizeof(table[0]), jint_cmp);
520 }
521
522 float default_cnt = 1.0F;
523 if (profile != nullptr) {
524 juint defaults = max_juint - len;
525 default_cnt = (float)profile->default_count()/(float)defaults;
526 }
527
528 int rnum = len*2+1;
529 bool makes_backward_branch = (default_dest <= bci());
530 SwitchRange* ranges = NEW_RESOURCE_ARRAY(SwitchRange, rnum);
531 int rp = -1;
532 for (int j = 0; j < len; j++) {
533 jint match_int = table[3*j+0];
534 jint dest = table[3*j+1];
535 jint cnt = table[3*j+2];
536 jint next_lo = rp < 0 ? min_jint : ranges[rp].hi()+1;
537 makes_backward_branch |= (dest <= bci());
538 float c = default_cnt * ((float)match_int - (float)next_lo);
539 if (match_int != next_lo && (rp < 0 || !ranges[rp].adjoinRange(next_lo, match_int-1, default_dest, c, trim_ranges))) {
540 assert(default_dest != never_reached, "sentinel value for dead destinations");
541 ranges[++rp].setRange(next_lo, match_int-1, default_dest, c);
542 }
543 if (rp < 0 || !ranges[rp].adjoin(match_int, dest, (float)cnt, trim_ranges)) {
544 assert(dest != never_reached, "sentinel value for dead destinations");
545 ranges[++rp].set(match_int, dest, (float)cnt);
546 }
547 }
548 jint highest = table[3*(len-1)];
549 assert(ranges[rp].hi() == highest, "");
550 if (highest != max_jint &&
551 !ranges[rp].adjoinRange(highest+1, max_jint, default_dest, default_cnt * ((float)max_jint - (float)highest), trim_ranges)) {
552 ranges[++rp].setRange(highest+1, max_jint, default_dest, default_cnt * ((float)max_jint - (float)highest));
553 }
554 assert(rp < rnum, "not too many ranges");
555
556 if (trim_ranges) {
557 merge_ranges(ranges, rp);
558 }
559
560 // Safepoint in case backward branch observed
561 if (makes_backward_branch) {
562 add_safepoint();
563 }
564
565 Node *lookup = pop(); // lookup value
566 jump_switch_ranges(lookup, &ranges[0], &ranges[rp]);
567 }
568
569 static float if_prob(float taken_cnt, float total_cnt) {
570 assert(taken_cnt <= total_cnt, "");
571 if (total_cnt == 0) {
572 return PROB_FAIR;
573 }
574 float p = taken_cnt / total_cnt;
575 return clamp(p, PROB_MIN, PROB_MAX);
576 }
577
578 static float if_cnt(float cnt) {
579 if (cnt == 0) {
580 return COUNT_UNKNOWN;
581 }
582 return cnt;
583 }
584
585 static float sum_of_cnts(SwitchRange *lo, SwitchRange *hi) {
586 float total_cnt = 0;
587 for (SwitchRange* sr = lo; sr <= hi; sr++) {
588 total_cnt += sr->cnt();
589 }
590 return total_cnt;
591 }
592
593 class SwitchRanges : public ResourceObj {
594 public:
595 SwitchRange* _lo;
596 SwitchRange* _hi;
597 SwitchRange* _mid;
598 float _cost;
599
600 enum {
601 Start,
602 LeftDone,
603 RightDone,
604 Done
605 } _state;
606
607 SwitchRanges(SwitchRange *lo, SwitchRange *hi)
608 : _lo(lo), _hi(hi), _mid(nullptr),
609 _cost(0), _state(Start) {
610 }
611
612 SwitchRanges()
613 : _lo(nullptr), _hi(nullptr), _mid(nullptr),
614 _cost(0), _state(Start) {}
615 };
616
617 // Estimate cost of performing a binary search on lo..hi
618 static float compute_tree_cost(SwitchRange *lo, SwitchRange *hi, float total_cnt) {
619 GrowableArray<SwitchRanges> tree;
620 SwitchRanges root(lo, hi);
621 tree.push(root);
622
623 float cost = 0;
624 do {
625 SwitchRanges& r = *tree.adr_at(tree.length()-1);
626 if (r._hi != r._lo) {
627 if (r._mid == nullptr) {
628 float r_cnt = sum_of_cnts(r._lo, r._hi);
629
630 if (r_cnt == 0) {
631 tree.pop();
632 cost = 0;
633 continue;
634 }
635
636 SwitchRange* mid = nullptr;
637 mid = r._lo;
638 for (float cnt = 0; ; ) {
639 assert(mid <= r._hi, "out of bounds");
640 cnt += mid->cnt();
641 if (cnt > r_cnt / 2) {
642 break;
643 }
644 mid++;
645 }
646 assert(mid <= r._hi, "out of bounds");
647 r._mid = mid;
648 r._cost = r_cnt / total_cnt;
649 }
650 r._cost += cost;
651 if (r._state < SwitchRanges::LeftDone && r._mid > r._lo) {
652 cost = 0;
653 r._state = SwitchRanges::LeftDone;
654 tree.push(SwitchRanges(r._lo, r._mid-1));
655 } else if (r._state < SwitchRanges::RightDone) {
656 cost = 0;
657 r._state = SwitchRanges::RightDone;
658 tree.push(SwitchRanges(r._mid == r._lo ? r._mid+1 : r._mid, r._hi));
659 } else {
660 tree.pop();
661 cost = r._cost;
662 }
663 } else {
664 tree.pop();
665 cost = r._cost;
666 }
667 } while (tree.length() > 0);
668
669
670 return cost;
671 }
672
673 // It sometimes pays off to test most common ranges before the binary search
674 void Parse::linear_search_switch_ranges(Node* key_val, SwitchRange*& lo, SwitchRange*& hi) {
675 uint nr = hi - lo + 1;
676 float total_cnt = sum_of_cnts(lo, hi);
677
678 float min = compute_tree_cost(lo, hi, total_cnt);
679 float extra = 1;
680 float sub = 0;
681
682 SwitchRange* array1 = lo;
683 SwitchRange* array2 = NEW_RESOURCE_ARRAY(SwitchRange, nr);
684
685 SwitchRange* ranges = nullptr;
686
687 while (nr >= 2) {
688 assert(lo == array1 || lo == array2, "one the 2 already allocated arrays");
689 ranges = (lo == array1) ? array2 : array1;
690
691 // Find highest frequency range
692 SwitchRange* candidate = lo;
693 for (SwitchRange* sr = lo+1; sr <= hi; sr++) {
694 if (sr->cnt() > candidate->cnt()) {
695 candidate = sr;
696 }
697 }
698 SwitchRange most_freq = *candidate;
699 if (most_freq.cnt() == 0) {
700 break;
701 }
702
703 // Copy remaining ranges into another array
704 int shift = 0;
705 for (uint i = 0; i < nr; i++) {
706 SwitchRange* sr = &lo[i];
707 if (sr != candidate) {
708 ranges[i-shift] = *sr;
709 } else {
710 shift++;
711 if (i > 0 && i < nr-1) {
712 SwitchRange prev = lo[i-1];
713 prev.setRange(prev.lo(), sr->hi(), prev.dest(), prev.cnt());
714 if (prev.adjoin(lo[i+1])) {
715 shift++;
716 i++;
717 }
718 ranges[i-shift] = prev;
719 }
720 }
721 }
722 nr -= shift;
723
724 // Evaluate cost of testing the most common range and performing a
725 // binary search on the other ranges
726 float cost = extra + compute_tree_cost(&ranges[0], &ranges[nr-1], total_cnt);
727 if (cost >= min) {
728 break;
729 }
730 // swap arrays
731 lo = &ranges[0];
732 hi = &ranges[nr-1];
733
734 // It pays off: emit the test for the most common range
735 assert(most_freq.cnt() > 0, "must be taken");
736 Node* val = _gvn.transform(new SubINode(key_val, _gvn.intcon(most_freq.lo())));
737 Node* cmp = _gvn.transform(new CmpUNode(val, _gvn.intcon(java_subtract(most_freq.hi(), most_freq.lo()))));
738 Node* tst = _gvn.transform(new BoolNode(cmp, BoolTest::le));
739 IfNode* iff = create_and_map_if(control(), tst, if_prob(most_freq.cnt(), total_cnt), if_cnt(most_freq.cnt()));
740 jump_if_true_fork(iff, most_freq.dest(), false);
741
742 sub += most_freq.cnt() / total_cnt;
743 extra += 1 - sub;
744 min = cost;
745 }
746 }
747
748 //----------------------------create_jump_tables-------------------------------
749 bool Parse::create_jump_tables(Node* key_val, SwitchRange* lo, SwitchRange* hi) {
750 // Are jumptables enabled
751 if (!UseJumpTables) return false;
752
753 // Are jumptables supported
754 if (!Matcher::has_match_rule(Op_Jump)) return false;
755
756 bool trim_ranges = !C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if);
757
758 // Decide if a guard is needed to lop off big ranges at either (or
759 // both) end(s) of the input set. We'll call this the default target
760 // even though we can't be sure that it is the true "default".
761
762 bool needs_guard = false;
763 int default_dest;
764 int64_t total_outlier_size = 0;
765 int64_t hi_size = ((int64_t)hi->hi()) - ((int64_t)hi->lo()) + 1;
766 int64_t lo_size = ((int64_t)lo->hi()) - ((int64_t)lo->lo()) + 1;
767
768 if (lo->dest() == hi->dest()) {
769 total_outlier_size = hi_size + lo_size;
770 default_dest = lo->dest();
771 } else if (lo_size > hi_size) {
772 total_outlier_size = lo_size;
773 default_dest = lo->dest();
774 } else {
775 total_outlier_size = hi_size;
776 default_dest = hi->dest();
777 }
778
779 float total = sum_of_cnts(lo, hi);
780 float cost = compute_tree_cost(lo, hi, total);
781
782 // If a guard test will eliminate very sparse end ranges, then
783 // it is worth the cost of an extra jump.
784 float trimmed_cnt = 0;
785 if (total_outlier_size > (MaxJumpTableSparseness * 4)) {
786 needs_guard = true;
787 if (default_dest == lo->dest()) {
788 trimmed_cnt += lo->cnt();
789 lo++;
790 }
791 if (default_dest == hi->dest()) {
792 trimmed_cnt += hi->cnt();
793 hi--;
794 }
795 }
796
797 // Find the total number of cases and ranges
798 int64_t num_cases = ((int64_t)hi->hi()) - ((int64_t)lo->lo()) + 1;
799 int num_range = hi - lo + 1;
800
801 // Don't create table if: too large, too small, or too sparse.
802 if (num_cases > MaxJumpTableSize)
803 return false;
804 if (UseSwitchProfiling) {
805 // MinJumpTableSize is set so with a well balanced binary tree,
806 // when the number of ranges is MinJumpTableSize, it's cheaper to
807 // go through a JumpNode that a tree of IfNodes. Average cost of a
808 // tree of IfNodes with MinJumpTableSize is
809 // log2f(MinJumpTableSize) comparisons. So if the cost computed
810 // from profile data is less than log2f(MinJumpTableSize) then
811 // going with the binary search is cheaper.
812 if (cost < log2f(MinJumpTableSize)) {
813 return false;
814 }
815 } else {
816 if (num_cases < MinJumpTableSize)
817 return false;
818 }
819 if (num_cases > (MaxJumpTableSparseness * num_range))
820 return false;
821
822 // Normalize table lookups to zero
823 int lowval = lo->lo();
824 key_val = _gvn.transform( new SubINode(key_val, _gvn.intcon(lowval)) );
825
826 // Generate a guard to protect against input keyvals that aren't
827 // in the switch domain.
828 if (needs_guard) {
829 Node* size = _gvn.intcon(num_cases);
830 Node* cmp = _gvn.transform(new CmpUNode(key_val, size));
831 Node* tst = _gvn.transform(new BoolNode(cmp, BoolTest::ge));
832 IfNode* iff = create_and_map_if(control(), tst, if_prob(trimmed_cnt, total), if_cnt(trimmed_cnt));
833 jump_if_true_fork(iff, default_dest, trim_ranges && trimmed_cnt == 0);
834
835 total -= trimmed_cnt;
836 }
837
838 // Create an ideal node JumpTable that has projections
839 // of all possible ranges for a switch statement
840 // The key_val input must be converted to a pointer offset and scaled.
841 // Compare Parse::array_addressing above.
842
843 // Clean the 32-bit int into a real 64-bit offset.
844 // Otherwise, the jint value 0 might turn into an offset of 0x0800000000.
845 // Make I2L conversion control dependent to prevent it from
846 // floating above the range check during loop optimizations.
847 // Do not use a narrow int type here to prevent the data path from dying
848 // while the control path is not removed. This can happen if the type of key_val
849 // is later known to be out of bounds of [0, num_cases] and therefore a narrow cast
850 // would be replaced by TOP while C2 is not able to fold the corresponding range checks.
851 // Set _carry_dependency for the cast to avoid being removed by IGVN.
852 #ifdef _LP64
853 key_val = C->constrained_convI2L(&_gvn, key_val, TypeInt::INT, control(), true /* carry_dependency */);
854 #endif
855
856 // Shift the value by wordsize so we have an index into the table, rather
857 // than a switch value
858 Node *shiftWord = _gvn.MakeConX(wordSize);
859 key_val = _gvn.transform( new MulXNode( key_val, shiftWord));
860
861 // Create the JumpNode
862 Arena* arena = C->comp_arena();
863 float* probs = (float*)arena->Amalloc(sizeof(float)*num_cases);
864 int i = 0;
865 if (total == 0) {
866 for (SwitchRange* r = lo; r <= hi; r++) {
867 for (int64_t j = r->lo(); j <= r->hi(); j++, i++) {
868 probs[i] = 1.0F / num_cases;
869 }
870 }
871 } else {
872 for (SwitchRange* r = lo; r <= hi; r++) {
873 float prob = r->cnt()/total;
874 for (int64_t j = r->lo(); j <= r->hi(); j++, i++) {
875 probs[i] = prob / (r->hi() - r->lo() + 1);
876 }
877 }
878 }
879
880 ciMethodData* methodData = method()->method_data();
881 ciMultiBranchData* profile = nullptr;
882 if (methodData->is_mature()) {
883 ciProfileData* data = methodData->bci_to_data(bci());
884 if (data != nullptr && data->is_MultiBranchData()) {
885 profile = (ciMultiBranchData*)data;
886 }
887 }
888
889 Node* jtn = _gvn.transform(new JumpNode(control(), key_val, num_cases, probs, profile == nullptr ? COUNT_UNKNOWN : total));
890
891 // These are the switch destinations hanging off the jumpnode
892 i = 0;
893 for (SwitchRange* r = lo; r <= hi; r++) {
894 for (int64_t j = r->lo(); j <= r->hi(); j++, i++) {
895 Node* input = _gvn.transform(new JumpProjNode(jtn, i, r->dest(), (int)(j - lowval)));
896 {
897 PreserveJVMState pjvms(this);
898 set_control(input);
899 jump_if_always_fork(r->dest(), trim_ranges && r->cnt() == 0);
900 }
901 }
902 }
903 assert(i == num_cases, "miscount of cases");
904 stop_and_kill_map(); // no more uses for this JVMS
905 return true;
906 }
907
908 //----------------------------jump_switch_ranges-------------------------------
909 void Parse::jump_switch_ranges(Node* key_val, SwitchRange *lo, SwitchRange *hi, int switch_depth) {
910 Block* switch_block = block();
911 bool trim_ranges = !C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if);
912
913 if (switch_depth == 0) {
914 // Do special processing for the top-level call.
915 assert(lo->lo() == min_jint, "initial range must exhaust Type::INT");
916 assert(hi->hi() == max_jint, "initial range must exhaust Type::INT");
917
918 // Decrement pred-numbers for the unique set of nodes.
919 #ifdef ASSERT
920 if (!trim_ranges) {
921 // Ensure that the block's successors are a (duplicate-free) set.
922 int successors_counted = 0; // block occurrences in [hi..lo]
923 int unique_successors = switch_block->num_successors();
924 for (int i = 0; i < unique_successors; i++) {
925 Block* target = switch_block->successor_at(i);
926
927 // Check that the set of successors is the same in both places.
928 int successors_found = 0;
929 for (SwitchRange* p = lo; p <= hi; p++) {
930 if (p->dest() == target->start()) successors_found++;
931 }
932 assert(successors_found > 0, "successor must be known");
933 successors_counted += successors_found;
934 }
935 assert(successors_counted == (hi-lo)+1, "no unexpected successors");
936 }
937 #endif
938
939 // Maybe prune the inputs, based on the type of key_val.
940 jint min_val = min_jint;
941 jint max_val = max_jint;
942 const TypeInt* ti = key_val->bottom_type()->isa_int();
943 if (ti != nullptr) {
944 min_val = ti->_lo;
945 max_val = ti->_hi;
946 assert(min_val <= max_val, "invalid int type");
947 }
948 while (lo->hi() < min_val) {
949 lo++;
950 }
951 if (lo->lo() < min_val) {
952 lo->setRange(min_val, lo->hi(), lo->dest(), lo->cnt());
953 }
954 while (hi->lo() > max_val) {
955 hi--;
956 }
957 if (hi->hi() > max_val) {
958 hi->setRange(hi->lo(), max_val, hi->dest(), hi->cnt());
959 }
960
961 linear_search_switch_ranges(key_val, lo, hi);
962 }
963
964 #ifndef PRODUCT
965 if (switch_depth == 0) {
966 _max_switch_depth = 0;
967 _est_switch_depth = log2i_graceful((hi - lo + 1) - 1) + 1;
968 }
969 #endif
970
971 assert(lo <= hi, "must be a non-empty set of ranges");
972 if (lo == hi) {
973 jump_if_always_fork(lo->dest(), trim_ranges && lo->cnt() == 0);
974 } else {
975 assert(lo->hi() == (lo+1)->lo()-1, "contiguous ranges");
976 assert(hi->lo() == (hi-1)->hi()+1, "contiguous ranges");
977
978 if (create_jump_tables(key_val, lo, hi)) return;
979
980 SwitchRange* mid = nullptr;
981 float total_cnt = sum_of_cnts(lo, hi);
982
983 int nr = hi - lo + 1;
984 if (UseSwitchProfiling) {
985 // Don't keep the binary search tree balanced: pick up mid point
986 // that split frequencies in half.
987 float cnt = 0;
988 for (SwitchRange* sr = lo; sr <= hi; sr++) {
989 cnt += sr->cnt();
990 if (cnt >= total_cnt / 2) {
991 mid = sr;
992 break;
993 }
994 }
995 } else {
996 mid = lo + nr/2;
997
998 // if there is an easy choice, pivot at a singleton:
999 if (nr > 3 && !mid->is_singleton() && (mid-1)->is_singleton()) mid--;
1000
1001 assert(lo < mid && mid <= hi, "good pivot choice");
1002 assert(nr != 2 || mid == hi, "should pick higher of 2");
1003 assert(nr != 3 || mid == hi-1, "should pick middle of 3");
1004 }
1005
1006
1007 Node *test_val = _gvn.intcon(mid == lo ? mid->hi() : mid->lo());
1008
1009 if (mid->is_singleton()) {
1010 IfNode *iff_ne = jump_if_fork_int(key_val, test_val, BoolTest::ne, 1-if_prob(mid->cnt(), total_cnt), if_cnt(mid->cnt()));
1011 jump_if_false_fork(iff_ne, mid->dest(), trim_ranges && mid->cnt() == 0);
1012
1013 // Special Case: If there are exactly three ranges, and the high
1014 // and low range each go to the same place, omit the "gt" test,
1015 // since it will not discriminate anything.
1016 bool eq_test_only = (hi == lo+2 && hi->dest() == lo->dest() && mid == hi-1) || mid == lo;
1017
1018 // if there is a higher range, test for it and process it:
1019 if (mid < hi && !eq_test_only) {
1020 // two comparisons of same values--should enable 1 test for 2 branches
1021 // Use BoolTest::lt instead of BoolTest::gt
1022 float cnt = sum_of_cnts(lo, mid-1);
1023 IfNode *iff_lt = jump_if_fork_int(key_val, test_val, BoolTest::lt, if_prob(cnt, total_cnt), if_cnt(cnt));
1024 Node *iftrue = _gvn.transform( new IfTrueNode(iff_lt) );
1025 Node *iffalse = _gvn.transform( new IfFalseNode(iff_lt) );
1026 { PreserveJVMState pjvms(this);
1027 set_control(iffalse);
1028 jump_switch_ranges(key_val, mid+1, hi, switch_depth+1);
1029 }
1030 set_control(iftrue);
1031 }
1032
1033 } else {
1034 // mid is a range, not a singleton, so treat mid..hi as a unit
1035 float cnt = sum_of_cnts(mid == lo ? mid+1 : mid, hi);
1036 IfNode *iff_ge = jump_if_fork_int(key_val, test_val, mid == lo ? BoolTest::gt : BoolTest::ge, if_prob(cnt, total_cnt), if_cnt(cnt));
1037
1038 // if there is a higher range, test for it and process it:
1039 if (mid == hi) {
1040 jump_if_true_fork(iff_ge, mid->dest(), trim_ranges && cnt == 0);
1041 } else {
1042 Node *iftrue = _gvn.transform( new IfTrueNode(iff_ge) );
1043 Node *iffalse = _gvn.transform( new IfFalseNode(iff_ge) );
1044 { PreserveJVMState pjvms(this);
1045 set_control(iftrue);
1046 jump_switch_ranges(key_val, mid == lo ? mid+1 : mid, hi, switch_depth+1);
1047 }
1048 set_control(iffalse);
1049 }
1050 }
1051
1052 // in any case, process the lower range
1053 if (mid == lo) {
1054 if (mid->is_singleton()) {
1055 jump_switch_ranges(key_val, lo+1, hi, switch_depth+1);
1056 } else {
1057 jump_if_always_fork(lo->dest(), trim_ranges && lo->cnt() == 0);
1058 }
1059 } else {
1060 jump_switch_ranges(key_val, lo, mid-1, switch_depth+1);
1061 }
1062 }
1063
1064 // Decrease pred_count for each successor after all is done.
1065 if (switch_depth == 0) {
1066 int unique_successors = switch_block->num_successors();
1067 for (int i = 0; i < unique_successors; i++) {
1068 Block* target = switch_block->successor_at(i);
1069 // Throw away the pre-allocated path for each unique successor.
1070 target->next_path_num();
1071 }
1072 }
1073
1074 #ifndef PRODUCT
1075 _max_switch_depth = MAX2(switch_depth, _max_switch_depth);
1076 if (TraceOptoParse && Verbose && WizardMode && switch_depth == 0) {
1077 SwitchRange* r;
1078 int nsing = 0;
1079 for( r = lo; r <= hi; r++ ) {
1080 if( r->is_singleton() ) nsing++;
1081 }
1082 tty->print(">>> ");
1083 _method->print_short_name();
1084 tty->print_cr(" switch decision tree");
1085 tty->print_cr(" %d ranges (%d singletons), max_depth=%d, est_depth=%d",
1086 (int) (hi-lo+1), nsing, _max_switch_depth, _est_switch_depth);
1087 if (_max_switch_depth > _est_switch_depth) {
1088 tty->print_cr("******** BAD SWITCH DEPTH ********");
1089 }
1090 tty->print(" ");
1091 for( r = lo; r <= hi; r++ ) {
1092 r->print();
1093 }
1094 tty->cr();
1095 }
1096 #endif
1097 }
1098
1099 void Parse::modf() {
1100 Node *f2 = pop();
1101 Node *f1 = pop();
1102 Node* c = make_runtime_call(RC_LEAF, OptoRuntime::modf_Type(),
1103 CAST_FROM_FN_PTR(address, SharedRuntime::frem),
1104 "frem", nullptr, //no memory effects
1105 f1, f2);
1106 Node* res = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 0));
1107
1108 push(res);
1109 }
1110
1111 void Parse::modd() {
1112 Node *d2 = pop_pair();
1113 Node *d1 = pop_pair();
1114 Node* c = make_runtime_call(RC_LEAF, OptoRuntime::Math_DD_D_Type(),
1115 CAST_FROM_FN_PTR(address, SharedRuntime::drem),
1116 "drem", nullptr, //no memory effects
1117 d1, top(), d2, top());
1118 Node* res_d = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 0));
1119
1120 #ifdef ASSERT
1121 Node* res_top = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 1));
1122 assert(res_top == top(), "second value must be top");
1123 #endif
1124
1125 push_pair(res_d);
1126 }
1127
1128 void Parse::l2f() {
1129 Node* f2 = pop();
1130 Node* f1 = pop();
1131 Node* c = make_runtime_call(RC_LEAF, OptoRuntime::l2f_Type(),
1132 CAST_FROM_FN_PTR(address, SharedRuntime::l2f),
1133 "l2f", nullptr, //no memory effects
1134 f1, f2);
1135 Node* res = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 0));
1136
1137 push(res);
1138 }
1139
1140 // Handle jsr and jsr_w bytecode
1141 void Parse::do_jsr() {
1142 assert(bc() == Bytecodes::_jsr || bc() == Bytecodes::_jsr_w, "wrong bytecode");
1143
1144 // Store information about current state, tagged with new _jsr_bci
1145 int return_bci = iter().next_bci();
1146 int jsr_bci = (bc() == Bytecodes::_jsr) ? iter().get_dest() : iter().get_far_dest();
1147
1148 // The way we do things now, there is only one successor block
1149 // for the jsr, because the target code is cloned by ciTypeFlow.
1150 Block* target = successor_for_bci(jsr_bci);
1151
1152 // What got pushed?
1153 const Type* ret_addr = target->peek();
1154 assert(ret_addr->singleton(), "must be a constant (cloned jsr body)");
1155
1156 // Effect on jsr on stack
1157 push(_gvn.makecon(ret_addr));
1158
1159 // Flow to the jsr.
1160 merge(jsr_bci);
1161 }
1162
1163 // Handle ret bytecode
1164 void Parse::do_ret() {
1165 // Find to whom we return.
1166 assert(block()->num_successors() == 1, "a ret can only go one place now");
1167 Block* target = block()->successor_at(0);
1168 assert(!target->is_ready(), "our arrival must be expected");
1169 int pnum = target->next_path_num();
1170 merge_common(target, pnum);
1171 }
1172
1173 static bool has_injected_profile(BoolTest::mask btest, Node* test, int& taken, int& not_taken) {
1174 if (btest != BoolTest::eq && btest != BoolTest::ne) {
1175 // Only ::eq and ::ne are supported for profile injection.
1176 return false;
1177 }
1178 if (test->is_Cmp() &&
1179 test->in(1)->Opcode() == Op_ProfileBoolean) {
1180 ProfileBooleanNode* profile = (ProfileBooleanNode*)test->in(1);
1181 int false_cnt = profile->false_count();
1182 int true_cnt = profile->true_count();
1183
1184 // Counts matching depends on the actual test operation (::eq or ::ne).
1185 // No need to scale the counts because profile injection was designed
1186 // to feed exact counts into VM.
1187 taken = (btest == BoolTest::eq) ? false_cnt : true_cnt;
1188 not_taken = (btest == BoolTest::eq) ? true_cnt : false_cnt;
1189
1190 profile->consume();
1191 return true;
1192 }
1193 return false;
1194 }
1195
1196 // Give up if too few (or too many, in which case the sum will overflow) counts to be meaningful.
1197 // We also check that individual counters are positive first, otherwise the sum can become positive.
1198 // (check for saturation, integer overflow, and immature counts)
1199 static bool counters_are_meaningful(int counter1, int counter2, int min) {
1200 // check for saturation, including "uint" values too big to fit in "int"
1201 if (counter1 < 0 || counter2 < 0) {
1202 return false;
1203 }
1204 // check for integer overflow of the sum
1205 int64_t sum = (int64_t)counter1 + (int64_t)counter2;
1206 STATIC_ASSERT(sizeof(counter1) < sizeof(sum));
1207 if (sum > INT_MAX) {
1208 return false;
1209 }
1210 // check if mature
1211 return (counter1 + counter2) >= min;
1212 }
1213
1214 //--------------------------dynamic_branch_prediction--------------------------
1215 // Try to gather dynamic branch prediction behavior. Return a probability
1216 // of the branch being taken and set the "cnt" field. Returns a -1.0
1217 // if we need to use static prediction for some reason.
1218 float Parse::dynamic_branch_prediction(float &cnt, BoolTest::mask btest, Node* test) {
1219 ResourceMark rm;
1220
1221 cnt = COUNT_UNKNOWN;
1222
1223 int taken = 0;
1224 int not_taken = 0;
1225
1226 bool use_mdo = !has_injected_profile(btest, test, taken, not_taken);
1227
1228 if (use_mdo) {
1229 // Use MethodData information if it is available
1230 // FIXME: free the ProfileData structure
1231 ciMethodData* methodData = method()->method_data();
1232 if (!methodData->is_mature()) return PROB_UNKNOWN;
1233 ciProfileData* data = methodData->bci_to_data(bci());
1234 if (data == nullptr) {
1235 return PROB_UNKNOWN;
1236 }
1237 if (!data->is_JumpData()) return PROB_UNKNOWN;
1238
1239 // get taken and not taken values
1240 // NOTE: saturated UINT_MAX values become negative,
1241 // as do counts above INT_MAX.
1242 taken = data->as_JumpData()->taken();
1243 not_taken = 0;
1244 if (data->is_BranchData()) {
1245 not_taken = data->as_BranchData()->not_taken();
1246 }
1247
1248 // scale the counts to be commensurate with invocation counts:
1249 // NOTE: overflow for positive values is clamped at INT_MAX
1250 taken = method()->scale_count(taken);
1251 not_taken = method()->scale_count(not_taken);
1252 }
1253 // At this point, saturation or overflow is indicated by INT_MAX
1254 // or a negative value.
1255
1256 // Give up if too few (or too many, in which case the sum will overflow) counts to be meaningful.
1257 // We also check that individual counters are positive first, otherwise the sum can become positive.
1258 if (!counters_are_meaningful(taken, not_taken, 40)) {
1259 if (C->log() != nullptr) {
1260 C->log()->elem("branch target_bci='%d' taken='%d' not_taken='%d'", iter().get_dest(), taken, not_taken);
1261 }
1262 return PROB_UNKNOWN;
1263 }
1264
1265 // Compute frequency that we arrive here
1266 float sum = taken + not_taken;
1267 // Adjust, if this block is a cloned private block but the
1268 // Jump counts are shared. Taken the private counts for
1269 // just this path instead of the shared counts.
1270 if( block()->count() > 0 )
1271 sum = block()->count();
1272 cnt = sum / FreqCountInvocations;
1273
1274 // Pin probability to sane limits
1275 float prob;
1276 if( !taken )
1277 prob = (0+PROB_MIN) / 2;
1278 else if( !not_taken )
1279 prob = (1+PROB_MAX) / 2;
1280 else { // Compute probability of true path
1281 prob = (float)taken / (float)(taken + not_taken);
1282 if (prob > PROB_MAX) prob = PROB_MAX;
1283 if (prob < PROB_MIN) prob = PROB_MIN;
1284 }
1285
1286 assert((cnt > 0.0f) && (prob > 0.0f),
1287 "Bad frequency assignment in if cnt=%g prob=%g taken=%d not_taken=%d", cnt, prob, taken, not_taken);
1288
1289 if (C->log() != nullptr) {
1290 const char* prob_str = nullptr;
1291 if (prob >= PROB_MAX) prob_str = (prob == PROB_MAX) ? "max" : "always";
1292 if (prob <= PROB_MIN) prob_str = (prob == PROB_MIN) ? "min" : "never";
1293 char prob_str_buf[30];
1294 if (prob_str == nullptr) {
1295 jio_snprintf(prob_str_buf, sizeof(prob_str_buf), "%20.2f", prob);
1296 prob_str = prob_str_buf;
1297 }
1298 C->log()->elem("branch target_bci='%d' taken='%d' not_taken='%d' cnt='%f' prob='%s'",
1299 iter().get_dest(), taken, not_taken, cnt, prob_str);
1300 }
1301 return prob;
1302 }
1303
1304 //-----------------------------branch_prediction-------------------------------
1305 float Parse::branch_prediction(float& cnt,
1306 BoolTest::mask btest,
1307 int target_bci,
1308 Node* test) {
1309 float prob = dynamic_branch_prediction(cnt, btest, test);
1310 // If prob is unknown, switch to static prediction
1311 if (prob != PROB_UNKNOWN) return prob;
1312
1313 prob = PROB_FAIR; // Set default value
1314 if (btest == BoolTest::eq) // Exactly equal test?
1315 prob = PROB_STATIC_INFREQUENT; // Assume its relatively infrequent
1316 else if (btest == BoolTest::ne)
1317 prob = PROB_STATIC_FREQUENT; // Assume its relatively frequent
1318
1319 // If this is a conditional test guarding a backwards branch,
1320 // assume its a loop-back edge. Make it a likely taken branch.
1321 if (target_bci < bci()) {
1322 if (is_osr_parse()) { // Could be a hot OSR'd loop; force deopt
1323 // Since it's an OSR, we probably have profile data, but since
1324 // branch_prediction returned PROB_UNKNOWN, the counts are too small.
1325 // Let's make a special check here for completely zero counts.
1326 ciMethodData* methodData = method()->method_data();
1327 if (!methodData->is_empty()) {
1328 ciProfileData* data = methodData->bci_to_data(bci());
1329 // Only stop for truly zero counts, which mean an unknown part
1330 // of the OSR-ed method, and we want to deopt to gather more stats.
1331 // If you have ANY counts, then this loop is simply 'cold' relative
1332 // to the OSR loop.
1333 if (data == nullptr ||
1334 (data->as_BranchData()->taken() + data->as_BranchData()->not_taken() == 0)) {
1335 // This is the only way to return PROB_UNKNOWN:
1336 return PROB_UNKNOWN;
1337 }
1338 }
1339 }
1340 prob = PROB_STATIC_FREQUENT; // Likely to take backwards branch
1341 }
1342
1343 assert(prob != PROB_UNKNOWN, "must have some guess at this point");
1344 return prob;
1345 }
1346
1347 // The magic constants are chosen so as to match the output of
1348 // branch_prediction() when the profile reports a zero taken count.
1349 // It is important to distinguish zero counts unambiguously, because
1350 // some branches (e.g., _213_javac.Assembler.eliminate) validly produce
1351 // very small but nonzero probabilities, which if confused with zero
1352 // counts would keep the program recompiling indefinitely.
1353 bool Parse::seems_never_taken(float prob) const {
1354 return prob < PROB_MIN;
1355 }
1356
1357 // True if the comparison seems to be the kind that will not change its
1358 // statistics from true to false. See comments in adjust_map_after_if.
1359 // This question is only asked along paths which are already
1360 // classified as untaken (by seems_never_taken), so really,
1361 // if a path is never taken, its controlling comparison is
1362 // already acting in a stable fashion. If the comparison
1363 // seems stable, we will put an expensive uncommon trap
1364 // on the untaken path.
1365 bool Parse::seems_stable_comparison() const {
1366 if (C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if)) {
1367 return false;
1368 }
1369 return true;
1370 }
1371
1372 //-------------------------------repush_if_args--------------------------------
1373 // Push arguments of an "if" bytecode back onto the stack by adjusting _sp.
1374 inline int Parse::repush_if_args() {
1375 if (PrintOpto && WizardMode) {
1376 tty->print("defending against excessive implicit null exceptions on %s @%d in ",
1377 Bytecodes::name(iter().cur_bc()), iter().cur_bci());
1378 method()->print_name(); tty->cr();
1379 }
1380 int bc_depth = - Bytecodes::depth(iter().cur_bc());
1381 assert(bc_depth == 1 || bc_depth == 2, "only two kinds of branches");
1382 DEBUG_ONLY(sync_jvms()); // argument(n) requires a synced jvms
1383 assert(argument(0) != nullptr, "must exist");
1384 assert(bc_depth == 1 || argument(1) != nullptr, "two must exist");
1385 inc_sp(bc_depth);
1386 return bc_depth;
1387 }
1388
1389 //----------------------------------do_ifnull----------------------------------
1390 void Parse::do_ifnull(BoolTest::mask btest, Node *c) {
1391 int target_bci = iter().get_dest();
1392
1393 Block* branch_block = successor_for_bci(target_bci);
1394 Block* next_block = successor_for_bci(iter().next_bci());
1395
1396 float cnt;
1397 float prob = branch_prediction(cnt, btest, target_bci, c);
1398 if (prob == PROB_UNKNOWN) {
1399 // (An earlier version of do_ifnull omitted this trap for OSR methods.)
1400 if (PrintOpto && Verbose) {
1401 tty->print_cr("Never-taken edge stops compilation at bci %d", bci());
1402 }
1403 repush_if_args(); // to gather stats on loop
1404 uncommon_trap(Deoptimization::Reason_unreached,
1405 Deoptimization::Action_reinterpret,
1406 nullptr, "cold");
1407 if (C->eliminate_boxing()) {
1408 // Mark the successor blocks as parsed
1409 branch_block->next_path_num();
1410 next_block->next_path_num();
1411 }
1412 return;
1413 }
1414
1415 NOT_PRODUCT(explicit_null_checks_inserted++);
1416
1417 // Generate real control flow
1418 Node *tst = _gvn.transform( new BoolNode( c, btest ) );
1419
1420 // Sanity check the probability value
1421 assert(prob > 0.0f,"Bad probability in Parser");
1422 // Need xform to put node in hash table
1423 IfNode *iff = create_and_xform_if( control(), tst, prob, cnt );
1424 assert(iff->_prob > 0.0f,"Optimizer made bad probability in parser");
1425 // True branch
1426 { PreserveJVMState pjvms(this);
1427 Node* iftrue = _gvn.transform( new IfTrueNode (iff) );
1428 set_control(iftrue);
1429
1430 if (stopped()) { // Path is dead?
1431 NOT_PRODUCT(explicit_null_checks_elided++);
1432 if (C->eliminate_boxing()) {
1433 // Mark the successor block as parsed
1434 branch_block->next_path_num();
1435 }
1436 } else { // Path is live.
1437 adjust_map_after_if(btest, c, prob, branch_block);
1438 if (!stopped()) {
1439 merge(target_bci);
1440 }
1441 }
1442 }
1443
1444 // False branch
1445 Node* iffalse = _gvn.transform( new IfFalseNode(iff) );
1446 set_control(iffalse);
1447
1448 if (stopped()) { // Path is dead?
1449 NOT_PRODUCT(explicit_null_checks_elided++);
1450 if (C->eliminate_boxing()) {
1451 // Mark the successor block as parsed
1452 next_block->next_path_num();
1453 }
1454 } else { // Path is live.
1455 adjust_map_after_if(BoolTest(btest).negate(), c, 1.0-prob, next_block);
1456 }
1457 }
1458
1459 //------------------------------------do_if------------------------------------
1460 void Parse::do_if(BoolTest::mask btest, Node* c) {
1461 int target_bci = iter().get_dest();
1462
1463 Block* branch_block = successor_for_bci(target_bci);
1464 Block* next_block = successor_for_bci(iter().next_bci());
1465
1466 float cnt;
1467 float prob = branch_prediction(cnt, btest, target_bci, c);
1468 float untaken_prob = 1.0 - prob;
1469
1470 if (prob == PROB_UNKNOWN) {
1471 if (PrintOpto && Verbose) {
1472 tty->print_cr("Never-taken edge stops compilation at bci %d", bci());
1473 }
1474 repush_if_args(); // to gather stats on loop
1475 uncommon_trap(Deoptimization::Reason_unreached,
1476 Deoptimization::Action_reinterpret,
1477 nullptr, "cold");
1478 if (C->eliminate_boxing()) {
1479 // Mark the successor blocks as parsed
1480 branch_block->next_path_num();
1481 next_block->next_path_num();
1482 }
1483 return;
1484 }
1485
1486 // Sanity check the probability value
1487 assert(0.0f < prob && prob < 1.0f,"Bad probability in Parser");
1488
1489 bool taken_if_true = true;
1490 // Convert BoolTest to canonical form:
1491 if (!BoolTest(btest).is_canonical()) {
1492 btest = BoolTest(btest).negate();
1493 taken_if_true = false;
1494 // prob is NOT updated here; it remains the probability of the taken
1495 // path (as opposed to the prob of the path guarded by an 'IfTrueNode').
1496 }
1497 assert(btest != BoolTest::eq, "!= is the only canonical exact test");
1498
1499 Node* tst0 = new BoolNode(c, btest);
1500 Node* tst = _gvn.transform(tst0);
1501 BoolTest::mask taken_btest = BoolTest::illegal;
1502 BoolTest::mask untaken_btest = BoolTest::illegal;
1503
1504 if (tst->is_Bool()) {
1505 // Refresh c from the transformed bool node, since it may be
1506 // simpler than the original c. Also re-canonicalize btest.
1507 // This wins when (Bool ne (Conv2B p) 0) => (Bool ne (CmpP p null)).
1508 // That can arise from statements like: if (x instanceof C) ...
1509 if (tst != tst0) {
1510 // Canonicalize one more time since transform can change it.
1511 btest = tst->as_Bool()->_test._test;
1512 if (!BoolTest(btest).is_canonical()) {
1513 // Reverse edges one more time...
1514 tst = _gvn.transform( tst->as_Bool()->negate(&_gvn) );
1515 btest = tst->as_Bool()->_test._test;
1516 assert(BoolTest(btest).is_canonical(), "sanity");
1517 taken_if_true = !taken_if_true;
1518 }
1519 c = tst->in(1);
1520 }
1521 BoolTest::mask neg_btest = BoolTest(btest).negate();
1522 taken_btest = taken_if_true ? btest : neg_btest;
1523 untaken_btest = taken_if_true ? neg_btest : btest;
1524 }
1525
1526 // Generate real control flow
1527 float true_prob = (taken_if_true ? prob : untaken_prob);
1528 IfNode* iff = create_and_map_if(control(), tst, true_prob, cnt);
1529 assert(iff->_prob > 0.0f,"Optimizer made bad probability in parser");
1530 Node* taken_branch = new IfTrueNode(iff);
1531 Node* untaken_branch = new IfFalseNode(iff);
1532 if (!taken_if_true) { // Finish conversion to canonical form
1533 Node* tmp = taken_branch;
1534 taken_branch = untaken_branch;
1535 untaken_branch = tmp;
1536 }
1537
1538 // Branch is taken:
1539 { PreserveJVMState pjvms(this);
1540 taken_branch = _gvn.transform(taken_branch);
1541 set_control(taken_branch);
1542
1543 if (stopped()) {
1544 if (C->eliminate_boxing()) {
1545 // Mark the successor block as parsed
1546 branch_block->next_path_num();
1547 }
1548 } else {
1549 adjust_map_after_if(taken_btest, c, prob, branch_block);
1550 if (!stopped()) {
1551 merge(target_bci);
1552 }
1553 }
1554 }
1555
1556 untaken_branch = _gvn.transform(untaken_branch);
1557 set_control(untaken_branch);
1558
1559 // Branch not taken.
1560 if (stopped()) {
1561 if (C->eliminate_boxing()) {
1562 // Mark the successor block as parsed
1563 next_block->next_path_num();
1564 }
1565 } else {
1566 adjust_map_after_if(untaken_btest, c, untaken_prob, next_block);
1567 }
1568 }
1569
1570 bool Parse::path_is_suitable_for_uncommon_trap(float prob) const {
1571 // Don't want to speculate on uncommon traps when running with -Xcomp
1572 if (!UseInterpreter) {
1573 return false;
1574 }
1575 return (seems_never_taken(prob) && seems_stable_comparison());
1576 }
1577
1578 void Parse::maybe_add_predicate_after_if(Block* path) {
1579 if (path->is_SEL_head() && path->preds_parsed() == 0) {
1580 // Add predicates at bci of if dominating the loop so traps can be
1581 // recorded on the if's profile data
1582 int bc_depth = repush_if_args();
1583 add_parse_predicates();
1584 dec_sp(bc_depth);
1585 path->set_has_predicates();
1586 }
1587 }
1588
1589
1590 //----------------------------adjust_map_after_if------------------------------
1591 // Adjust the JVM state to reflect the result of taking this path.
1592 // Basically, it means inspecting the CmpNode controlling this
1593 // branch, seeing how it constrains a tested value, and then
1594 // deciding if it's worth our while to encode this constraint
1595 // as graph nodes in the current abstract interpretation map.
1596 void Parse::adjust_map_after_if(BoolTest::mask btest, Node* c, float prob, Block* path) {
1597 if (!c->is_Cmp()) {
1598 maybe_add_predicate_after_if(path);
1599 return;
1600 }
1601
1602 if (stopped() || btest == BoolTest::illegal) {
1603 return; // nothing to do
1604 }
1605
1606 bool is_fallthrough = (path == successor_for_bci(iter().next_bci()));
1607
1608 if (path_is_suitable_for_uncommon_trap(prob)) {
1609 repush_if_args();
1610 Node* call = uncommon_trap(Deoptimization::Reason_unstable_if,
1611 Deoptimization::Action_reinterpret,
1612 nullptr,
1613 (is_fallthrough ? "taken always" : "taken never"));
1614
1615 if (call != nullptr) {
1616 C->record_unstable_if_trap(new UnstableIfTrap(call->as_CallStaticJava(), path));
1617 }
1618 return;
1619 }
1620
1621 Node* val = c->in(1);
1622 Node* con = c->in(2);
1623 const Type* tcon = _gvn.type(con);
1624 const Type* tval = _gvn.type(val);
1625 bool have_con = tcon->singleton();
1626 if (tval->singleton()) {
1627 if (!have_con) {
1628 // Swap, so constant is in con.
1629 con = val;
1630 tcon = tval;
1631 val = c->in(2);
1632 tval = _gvn.type(val);
1633 btest = BoolTest(btest).commute();
1634 have_con = true;
1635 } else {
1636 // Do we have two constants? Then leave well enough alone.
1637 have_con = false;
1638 }
1639 }
1640 if (!have_con) { // remaining adjustments need a con
1641 maybe_add_predicate_after_if(path);
1642 return;
1643 }
1644
1645 sharpen_type_after_if(btest, con, tcon, val, tval);
1646 maybe_add_predicate_after_if(path);
1647 }
1648
1649
1650 static Node* extract_obj_from_klass_load(PhaseGVN* gvn, Node* n) {
1651 Node* ldk;
1652 if (n->is_DecodeNKlass()) {
1653 if (n->in(1)->Opcode() != Op_LoadNKlass) {
1654 return nullptr;
1655 } else {
1656 ldk = n->in(1);
1657 }
1658 } else if (n->Opcode() != Op_LoadKlass) {
1659 return nullptr;
1660 } else {
1661 ldk = n;
1662 }
1663 assert(ldk != nullptr && ldk->is_Load(), "should have found a LoadKlass or LoadNKlass node");
1664
1665 Node* adr = ldk->in(MemNode::Address);
1666 intptr_t off = 0;
1667 Node* obj = AddPNode::Ideal_base_and_offset(adr, gvn, off);
1668 if (obj == nullptr || off != oopDesc::klass_offset_in_bytes()) // loading oopDesc::_klass?
1669 return nullptr;
1670 const TypePtr* tp = gvn->type(obj)->is_ptr();
1671 if (tp == nullptr || !(tp->isa_instptr() || tp->isa_aryptr())) // is obj a Java object ptr?
1672 return nullptr;
1673
1674 return obj;
1675 }
1676
1677 void Parse::sharpen_type_after_if(BoolTest::mask btest,
1678 Node* con, const Type* tcon,
1679 Node* val, const Type* tval) {
1680 // Look for opportunities to sharpen the type of a node
1681 // whose klass is compared with a constant klass.
1682 if (btest == BoolTest::eq && tcon->isa_klassptr()) {
1683 Node* obj = extract_obj_from_klass_load(&_gvn, val);
1684 const TypeOopPtr* con_type = tcon->isa_klassptr()->as_instance_type();
1685 if (obj != nullptr && (con_type->isa_instptr() || con_type->isa_aryptr())) {
1686 // Found:
1687 // Bool(CmpP(LoadKlass(obj._klass), ConP(Foo.klass)), [eq])
1688 // or the narrowOop equivalent.
1689 const Type* obj_type = _gvn.type(obj);
1690 const TypeOopPtr* tboth = obj_type->join_speculative(con_type)->isa_oopptr();
1691 if (tboth != nullptr && tboth->klass_is_exact() && tboth != obj_type &&
1692 tboth->higher_equal(obj_type)) {
1693 // obj has to be of the exact type Foo if the CmpP succeeds.
1694 int obj_in_map = map()->find_edge(obj);
1695 JVMState* jvms = this->jvms();
1696 if (obj_in_map >= 0 &&
1697 (jvms->is_loc(obj_in_map) || jvms->is_stk(obj_in_map))) {
1698 TypeNode* ccast = new CheckCastPPNode(control(), obj, tboth);
1699 const Type* tcc = ccast->as_Type()->type();
1700 assert(tcc != obj_type && tcc->higher_equal(obj_type), "must improve");
1701 // Delay transform() call to allow recovery of pre-cast value
1702 // at the control merge.
1703 _gvn.set_type_bottom(ccast);
1704 record_for_igvn(ccast);
1705 // Here's the payoff.
1706 replace_in_map(obj, ccast);
1707 }
1708 }
1709 }
1710 }
1711
1712 int val_in_map = map()->find_edge(val);
1713 if (val_in_map < 0) return; // replace_in_map would be useless
1714 {
1715 JVMState* jvms = this->jvms();
1716 if (!(jvms->is_loc(val_in_map) ||
1717 jvms->is_stk(val_in_map)))
1718 return; // again, it would be useless
1719 }
1720
1721 // Check for a comparison to a constant, and "know" that the compared
1722 // value is constrained on this path.
1723 assert(tcon->singleton(), "");
1724 ConstraintCastNode* ccast = nullptr;
1725 Node* cast = nullptr;
1726
1727 switch (btest) {
1728 case BoolTest::eq: // Constant test?
1729 {
1730 const Type* tboth = tcon->join_speculative(tval);
1731 if (tboth == tval) break; // Nothing to gain.
1732 if (tcon->isa_int()) {
1733 ccast = new CastIINode(val, tboth);
1734 } else if (tcon == TypePtr::NULL_PTR) {
1735 // Cast to null, but keep the pointer identity temporarily live.
1736 ccast = new CastPPNode(val, tboth);
1737 } else {
1738 const TypeF* tf = tcon->isa_float_constant();
1739 const TypeD* td = tcon->isa_double_constant();
1740 // Exclude tests vs float/double 0 as these could be
1741 // either +0 or -0. Just because you are equal to +0
1742 // doesn't mean you ARE +0!
1743 // Note, following code also replaces Long and Oop values.
1744 if ((!tf || tf->_f != 0.0) &&
1745 (!td || td->_d != 0.0))
1746 cast = con; // Replace non-constant val by con.
1747 }
1748 }
1749 break;
1750
1751 case BoolTest::ne:
1752 if (tcon == TypePtr::NULL_PTR) {
1753 cast = cast_not_null(val, false);
1754 }
1755 break;
1756
1757 default:
1758 // (At this point we could record int range types with CastII.)
1759 break;
1760 }
1761
1762 if (ccast != nullptr) {
1763 const Type* tcc = ccast->as_Type()->type();
1764 assert(tcc != tval && tcc->higher_equal(tval), "must improve");
1765 // Delay transform() call to allow recovery of pre-cast value
1766 // at the control merge.
1767 ccast->set_req(0, control());
1768 _gvn.set_type_bottom(ccast);
1769 record_for_igvn(ccast);
1770 cast = ccast;
1771 }
1772
1773 if (cast != nullptr) { // Here's the payoff.
1774 replace_in_map(val, cast);
1775 }
1776 }
1777
1778 /**
1779 * Use speculative type to optimize CmpP node: if comparison is
1780 * against the low level class, cast the object to the speculative
1781 * type if any. CmpP should then go away.
1782 *
1783 * @param c expected CmpP node
1784 * @return result of CmpP on object casted to speculative type
1785 *
1786 */
1787 Node* Parse::optimize_cmp_with_klass(Node* c) {
1788 // If this is transformed by the _gvn to a comparison with the low
1789 // level klass then we may be able to use speculation
1790 if (c->Opcode() == Op_CmpP &&
1791 (c->in(1)->Opcode() == Op_LoadKlass || c->in(1)->Opcode() == Op_DecodeNKlass) &&
1792 c->in(2)->is_Con()) {
1793 Node* load_klass = nullptr;
1794 Node* decode = nullptr;
1795 if (c->in(1)->Opcode() == Op_DecodeNKlass) {
1796 decode = c->in(1);
1797 load_klass = c->in(1)->in(1);
1798 } else {
1799 load_klass = c->in(1);
1800 }
1801 if (load_klass->in(2)->is_AddP()) {
1802 Node* addp = load_klass->in(2);
1803 Node* obj = addp->in(AddPNode::Address);
1804 const TypeOopPtr* obj_type = _gvn.type(obj)->is_oopptr();
1805 if (obj_type->speculative_type_not_null() != nullptr) {
1806 ciKlass* k = obj_type->speculative_type();
1807 inc_sp(2);
1808 obj = maybe_cast_profiled_obj(obj, k);
1809 dec_sp(2);
1810 // Make the CmpP use the casted obj
1811 addp = basic_plus_adr(obj, addp->in(AddPNode::Offset));
1812 load_klass = load_klass->clone();
1813 load_klass->set_req(2, addp);
1814 load_klass = _gvn.transform(load_klass);
1815 if (decode != nullptr) {
1816 decode = decode->clone();
1817 decode->set_req(1, load_klass);
1818 load_klass = _gvn.transform(decode);
1819 }
1820 c = c->clone();
1821 c->set_req(1, load_klass);
1822 c = _gvn.transform(c);
1823 }
1824 }
1825 }
1826 return c;
1827 }
1828
1829 //------------------------------do_one_bytecode--------------------------------
1830 // Parse this bytecode, and alter the Parsers JVM->Node mapping
1831 void Parse::do_one_bytecode() {
1832 Node *a, *b, *c, *d; // Handy temps
1833 BoolTest::mask btest;
1834 int i;
1835
1836 assert(!has_exceptions(), "bytecode entry state must be clear of throws");
1837
1838 if (C->check_node_count(NodeLimitFudgeFactor * 5,
1839 "out of nodes parsing method")) {
1840 return;
1841 }
1842
1843 #ifdef ASSERT
1844 // for setting breakpoints
1845 if (TraceOptoParse) {
1846 tty->print(" @");
1847 dump_bci(bci());
1848 tty->print(" %s", Bytecodes::name(bc()));
1849 tty->cr();
1850 }
1851 #endif
1852
1853 switch (bc()) {
1854 case Bytecodes::_nop:
1855 // do nothing
1856 break;
1857 case Bytecodes::_lconst_0:
1858 push_pair(longcon(0));
1859 break;
1860
1861 case Bytecodes::_lconst_1:
1862 push_pair(longcon(1));
1863 break;
1864
1865 case Bytecodes::_fconst_0:
1866 push(zerocon(T_FLOAT));
1867 break;
1868
1869 case Bytecodes::_fconst_1:
1870 push(makecon(TypeF::ONE));
1871 break;
1872
1873 case Bytecodes::_fconst_2:
1874 push(makecon(TypeF::make(2.0f)));
1875 break;
1876
1877 case Bytecodes::_dconst_0:
1878 push_pair(zerocon(T_DOUBLE));
1879 break;
1880
1881 case Bytecodes::_dconst_1:
1882 push_pair(makecon(TypeD::ONE));
1883 break;
1884
1885 case Bytecodes::_iconst_m1:push(intcon(-1)); break;
1886 case Bytecodes::_iconst_0: push(intcon( 0)); break;
1887 case Bytecodes::_iconst_1: push(intcon( 1)); break;
1888 case Bytecodes::_iconst_2: push(intcon( 2)); break;
1889 case Bytecodes::_iconst_3: push(intcon( 3)); break;
1890 case Bytecodes::_iconst_4: push(intcon( 4)); break;
1891 case Bytecodes::_iconst_5: push(intcon( 5)); break;
1892 case Bytecodes::_bipush: push(intcon(iter().get_constant_u1())); break;
1893 case Bytecodes::_sipush: push(intcon(iter().get_constant_u2())); break;
1894 case Bytecodes::_aconst_null: push(null()); break;
1895
1896 case Bytecodes::_ldc:
1897 case Bytecodes::_ldc_w:
1898 case Bytecodes::_ldc2_w: {
1899 ciConstant constant = iter().get_constant();
1900 if (constant.is_loaded()) {
1901 const Type* con_type = Type::make_from_constant(constant);
1902 if (con_type != nullptr) {
1903 push_node(con_type->basic_type(), makecon(con_type));
1904 }
1905 } else {
1906 // If the constant is unresolved or in error state, run this BC in the interpreter.
1907 if (iter().is_in_error()) {
1908 uncommon_trap(Deoptimization::make_trap_request(Deoptimization::Reason_unhandled,
1909 Deoptimization::Action_none),
1910 nullptr, "constant in error state", true /* must_throw */);
1911
1912 } else {
1913 int index = iter().get_constant_pool_index();
1914 uncommon_trap(Deoptimization::make_trap_request(Deoptimization::Reason_unloaded,
1915 Deoptimization::Action_reinterpret,
1916 index),
1917 nullptr, "unresolved constant", false /* must_throw */);
1918 }
1919 }
1920 break;
1921 }
1922
1923 case Bytecodes::_aload_0:
1924 push( local(0) );
1925 break;
1926 case Bytecodes::_aload_1:
1927 push( local(1) );
1928 break;
1929 case Bytecodes::_aload_2:
1930 push( local(2) );
1931 break;
1932 case Bytecodes::_aload_3:
1933 push( local(3) );
1934 break;
1935 case Bytecodes::_aload:
1936 push( local(iter().get_index()) );
1937 break;
1938
1939 case Bytecodes::_fload_0:
1940 case Bytecodes::_iload_0:
1941 push( local(0) );
1942 break;
1943 case Bytecodes::_fload_1:
1944 case Bytecodes::_iload_1:
1945 push( local(1) );
1946 break;
1947 case Bytecodes::_fload_2:
1948 case Bytecodes::_iload_2:
1949 push( local(2) );
1950 break;
1951 case Bytecodes::_fload_3:
1952 case Bytecodes::_iload_3:
1953 push( local(3) );
1954 break;
1955 case Bytecodes::_fload:
1956 case Bytecodes::_iload:
1957 push( local(iter().get_index()) );
1958 break;
1959 case Bytecodes::_lload_0:
1960 push_pair_local( 0 );
1961 break;
1962 case Bytecodes::_lload_1:
1963 push_pair_local( 1 );
1964 break;
1965 case Bytecodes::_lload_2:
1966 push_pair_local( 2 );
1967 break;
1968 case Bytecodes::_lload_3:
1969 push_pair_local( 3 );
1970 break;
1971 case Bytecodes::_lload:
1972 push_pair_local( iter().get_index() );
1973 break;
1974
1975 case Bytecodes::_dload_0:
1976 push_pair_local(0);
1977 break;
1978 case Bytecodes::_dload_1:
1979 push_pair_local(1);
1980 break;
1981 case Bytecodes::_dload_2:
1982 push_pair_local(2);
1983 break;
1984 case Bytecodes::_dload_3:
1985 push_pair_local(3);
1986 break;
1987 case Bytecodes::_dload:
1988 push_pair_local(iter().get_index());
1989 break;
1990 case Bytecodes::_fstore_0:
1991 case Bytecodes::_istore_0:
1992 case Bytecodes::_astore_0:
1993 set_local( 0, pop() );
1994 break;
1995 case Bytecodes::_fstore_1:
1996 case Bytecodes::_istore_1:
1997 case Bytecodes::_astore_1:
1998 set_local( 1, pop() );
1999 break;
2000 case Bytecodes::_fstore_2:
2001 case Bytecodes::_istore_2:
2002 case Bytecodes::_astore_2:
2003 set_local( 2, pop() );
2004 break;
2005 case Bytecodes::_fstore_3:
2006 case Bytecodes::_istore_3:
2007 case Bytecodes::_astore_3:
2008 set_local( 3, pop() );
2009 break;
2010 case Bytecodes::_fstore:
2011 case Bytecodes::_istore:
2012 case Bytecodes::_astore:
2013 set_local( iter().get_index(), pop() );
2014 break;
2015 // long stores
2016 case Bytecodes::_lstore_0:
2017 set_pair_local( 0, pop_pair() );
2018 break;
2019 case Bytecodes::_lstore_1:
2020 set_pair_local( 1, pop_pair() );
2021 break;
2022 case Bytecodes::_lstore_2:
2023 set_pair_local( 2, pop_pair() );
2024 break;
2025 case Bytecodes::_lstore_3:
2026 set_pair_local( 3, pop_pair() );
2027 break;
2028 case Bytecodes::_lstore:
2029 set_pair_local( iter().get_index(), pop_pair() );
2030 break;
2031
2032 // double stores
2033 case Bytecodes::_dstore_0:
2034 set_pair_local( 0, dprecision_rounding(pop_pair()) );
2035 break;
2036 case Bytecodes::_dstore_1:
2037 set_pair_local( 1, dprecision_rounding(pop_pair()) );
2038 break;
2039 case Bytecodes::_dstore_2:
2040 set_pair_local( 2, dprecision_rounding(pop_pair()) );
2041 break;
2042 case Bytecodes::_dstore_3:
2043 set_pair_local( 3, dprecision_rounding(pop_pair()) );
2044 break;
2045 case Bytecodes::_dstore:
2046 set_pair_local( iter().get_index(), dprecision_rounding(pop_pair()) );
2047 break;
2048
2049 case Bytecodes::_pop: dec_sp(1); break;
2050 case Bytecodes::_pop2: dec_sp(2); break;
2051 case Bytecodes::_swap:
2052 a = pop();
2053 b = pop();
2054 push(a);
2055 push(b);
2056 break;
2057 case Bytecodes::_dup:
2058 a = pop();
2059 push(a);
2060 push(a);
2061 break;
2062 case Bytecodes::_dup_x1:
2063 a = pop();
2064 b = pop();
2065 push( a );
2066 push( b );
2067 push( a );
2068 break;
2069 case Bytecodes::_dup_x2:
2070 a = pop();
2071 b = pop();
2072 c = pop();
2073 push( a );
2074 push( c );
2075 push( b );
2076 push( a );
2077 break;
2078 case Bytecodes::_dup2:
2079 a = pop();
2080 b = pop();
2081 push( b );
2082 push( a );
2083 push( b );
2084 push( a );
2085 break;
2086
2087 case Bytecodes::_dup2_x1:
2088 // before: .. c, b, a
2089 // after: .. b, a, c, b, a
2090 // not tested
2091 a = pop();
2092 b = pop();
2093 c = pop();
2094 push( b );
2095 push( a );
2096 push( c );
2097 push( b );
2098 push( a );
2099 break;
2100 case Bytecodes::_dup2_x2:
2101 // before: .. d, c, b, a
2102 // after: .. b, a, d, c, b, a
2103 // not tested
2104 a = pop();
2105 b = pop();
2106 c = pop();
2107 d = pop();
2108 push( b );
2109 push( a );
2110 push( d );
2111 push( c );
2112 push( b );
2113 push( a );
2114 break;
2115
2116 case Bytecodes::_arraylength: {
2117 // Must do null-check with value on expression stack
2118 Node *ary = null_check(peek(), T_ARRAY);
2119 // Compile-time detect of null-exception?
2120 if (stopped()) return;
2121 a = pop();
2122 push(load_array_length(a));
2123 break;
2124 }
2125
2126 case Bytecodes::_baload: array_load(T_BYTE); break;
2127 case Bytecodes::_caload: array_load(T_CHAR); break;
2128 case Bytecodes::_iaload: array_load(T_INT); break;
2129 case Bytecodes::_saload: array_load(T_SHORT); break;
2130 case Bytecodes::_faload: array_load(T_FLOAT); break;
2131 case Bytecodes::_aaload: array_load(T_OBJECT); break;
2132 case Bytecodes::_laload: array_load(T_LONG); break;
2133 case Bytecodes::_daload: array_load(T_DOUBLE); break;
2134 case Bytecodes::_bastore: array_store(T_BYTE); break;
2135 case Bytecodes::_castore: array_store(T_CHAR); break;
2136 case Bytecodes::_iastore: array_store(T_INT); break;
2137 case Bytecodes::_sastore: array_store(T_SHORT); break;
2138 case Bytecodes::_fastore: array_store(T_FLOAT); break;
2139 case Bytecodes::_aastore: array_store(T_OBJECT); break;
2140 case Bytecodes::_lastore: array_store(T_LONG); break;
2141 case Bytecodes::_dastore: array_store(T_DOUBLE); break;
2142
2143 case Bytecodes::_getfield:
2144 do_getfield();
2145 break;
2146
2147 case Bytecodes::_getstatic:
2148 do_getstatic();
2149 break;
2150
2151 case Bytecodes::_putfield:
2152 do_putfield();
2153 break;
2154
2155 case Bytecodes::_putstatic:
2156 do_putstatic();
2157 break;
2158
2159 case Bytecodes::_irem:
2160 // Must keep both values on the expression-stack during null-check
2161 zero_check_int(peek());
2162 // Compile-time detect of null-exception?
2163 if (stopped()) return;
2164 b = pop();
2165 a = pop();
2166 push(_gvn.transform(new ModINode(control(), a, b)));
2167 break;
2168 case Bytecodes::_idiv:
2169 // Must keep both values on the expression-stack during null-check
2170 zero_check_int(peek());
2171 // Compile-time detect of null-exception?
2172 if (stopped()) return;
2173 b = pop();
2174 a = pop();
2175 push( _gvn.transform( new DivINode(control(),a,b) ) );
2176 break;
2177 case Bytecodes::_imul:
2178 b = pop(); a = pop();
2179 push( _gvn.transform( new MulINode(a,b) ) );
2180 break;
2181 case Bytecodes::_iadd:
2182 b = pop(); a = pop();
2183 push( _gvn.transform( new AddINode(a,b) ) );
2184 break;
2185 case Bytecodes::_ineg:
2186 a = pop();
2187 push( _gvn.transform( new SubINode(_gvn.intcon(0),a)) );
2188 break;
2189 case Bytecodes::_isub:
2190 b = pop(); a = pop();
2191 push( _gvn.transform( new SubINode(a,b) ) );
2192 break;
2193 case Bytecodes::_iand:
2194 b = pop(); a = pop();
2195 push( _gvn.transform( new AndINode(a,b) ) );
2196 break;
2197 case Bytecodes::_ior:
2198 b = pop(); a = pop();
2199 push( _gvn.transform( new OrINode(a,b) ) );
2200 break;
2201 case Bytecodes::_ixor:
2202 b = pop(); a = pop();
2203 push( _gvn.transform( new XorINode(a,b) ) );
2204 break;
2205 case Bytecodes::_ishl:
2206 b = pop(); a = pop();
2207 push( _gvn.transform( new LShiftINode(a,b) ) );
2208 break;
2209 case Bytecodes::_ishr:
2210 b = pop(); a = pop();
2211 push( _gvn.transform( new RShiftINode(a,b) ) );
2212 break;
2213 case Bytecodes::_iushr:
2214 b = pop(); a = pop();
2215 push( _gvn.transform( new URShiftINode(a,b) ) );
2216 break;
2217
2218 case Bytecodes::_fneg:
2219 a = pop();
2220 b = _gvn.transform(new NegFNode (a));
2221 push(b);
2222 break;
2223
2224 case Bytecodes::_fsub:
2225 b = pop();
2226 a = pop();
2227 c = _gvn.transform( new SubFNode(a,b) );
2228 d = precision_rounding(c);
2229 push( d );
2230 break;
2231
2232 case Bytecodes::_fadd:
2233 b = pop();
2234 a = pop();
2235 c = _gvn.transform( new AddFNode(a,b) );
2236 d = precision_rounding(c);
2237 push( d );
2238 break;
2239
2240 case Bytecodes::_fmul:
2241 b = pop();
2242 a = pop();
2243 c = _gvn.transform( new MulFNode(a,b) );
2244 d = precision_rounding(c);
2245 push( d );
2246 break;
2247
2248 case Bytecodes::_fdiv:
2249 b = pop();
2250 a = pop();
2251 c = _gvn.transform( new DivFNode(0,a,b) );
2252 d = precision_rounding(c);
2253 push( d );
2254 break;
2255
2256 case Bytecodes::_frem:
2257 if (Matcher::has_match_rule(Op_ModF)) {
2258 // Generate a ModF node.
2259 b = pop();
2260 a = pop();
2261 c = _gvn.transform( new ModFNode(0,a,b) );
2262 d = precision_rounding(c);
2263 push( d );
2264 }
2265 else {
2266 // Generate a call.
2267 modf();
2268 }
2269 break;
2270
2271 case Bytecodes::_fcmpl:
2272 b = pop();
2273 a = pop();
2274 c = _gvn.transform( new CmpF3Node( a, b));
2275 push(c);
2276 break;
2277 case Bytecodes::_fcmpg:
2278 b = pop();
2279 a = pop();
2280
2281 // Same as fcmpl but need to flip the unordered case. Swap the inputs,
2282 // which negates the result sign except for unordered. Flip the unordered
2283 // as well by using CmpF3 which implements unordered-lesser instead of
2284 // unordered-greater semantics. Finally, commute the result bits. Result
2285 // is same as using a CmpF3Greater except we did it with CmpF3 alone.
2286 c = _gvn.transform( new CmpF3Node( b, a));
2287 c = _gvn.transform( new SubINode(_gvn.intcon(0),c) );
2288 push(c);
2289 break;
2290
2291 case Bytecodes::_f2i:
2292 a = pop();
2293 push(_gvn.transform(new ConvF2INode(a)));
2294 break;
2295
2296 case Bytecodes::_d2i:
2297 a = pop_pair();
2298 b = _gvn.transform(new ConvD2INode(a));
2299 push( b );
2300 break;
2301
2302 case Bytecodes::_f2d:
2303 a = pop();
2304 b = _gvn.transform( new ConvF2DNode(a));
2305 push_pair( b );
2306 break;
2307
2308 case Bytecodes::_d2f:
2309 a = pop_pair();
2310 b = _gvn.transform( new ConvD2FNode(a));
2311 // This breaks _227_mtrt (speed & correctness) and _222_mpegaudio (speed)
2312 //b = _gvn.transform(new RoundFloatNode(0, b) );
2313 push( b );
2314 break;
2315
2316 case Bytecodes::_l2f:
2317 if (Matcher::convL2FSupported()) {
2318 a = pop_pair();
2319 b = _gvn.transform( new ConvL2FNode(a));
2320 // For x86_32.ad, FILD doesn't restrict precision to 24 or 53 bits.
2321 // Rather than storing the result into an FP register then pushing
2322 // out to memory to round, the machine instruction that implements
2323 // ConvL2D is responsible for rounding.
2324 // c = precision_rounding(b);
2325 push(b);
2326 } else {
2327 l2f();
2328 }
2329 break;
2330
2331 case Bytecodes::_l2d:
2332 a = pop_pair();
2333 b = _gvn.transform( new ConvL2DNode(a));
2334 // For x86_32.ad, rounding is always necessary (see _l2f above).
2335 // c = dprecision_rounding(b);
2336 push_pair(b);
2337 break;
2338
2339 case Bytecodes::_f2l:
2340 a = pop();
2341 b = _gvn.transform( new ConvF2LNode(a));
2342 push_pair(b);
2343 break;
2344
2345 case Bytecodes::_d2l:
2346 a = pop_pair();
2347 b = _gvn.transform( new ConvD2LNode(a));
2348 push_pair(b);
2349 break;
2350
2351 case Bytecodes::_dsub:
2352 b = pop_pair();
2353 a = pop_pair();
2354 c = _gvn.transform( new SubDNode(a,b) );
2355 d = dprecision_rounding(c);
2356 push_pair( d );
2357 break;
2358
2359 case Bytecodes::_dadd:
2360 b = pop_pair();
2361 a = pop_pair();
2362 c = _gvn.transform( new AddDNode(a,b) );
2363 d = dprecision_rounding(c);
2364 push_pair( d );
2365 break;
2366
2367 case Bytecodes::_dmul:
2368 b = pop_pair();
2369 a = pop_pair();
2370 c = _gvn.transform( new MulDNode(a,b) );
2371 d = dprecision_rounding(c);
2372 push_pair( d );
2373 break;
2374
2375 case Bytecodes::_ddiv:
2376 b = pop_pair();
2377 a = pop_pair();
2378 c = _gvn.transform( new DivDNode(0,a,b) );
2379 d = dprecision_rounding(c);
2380 push_pair( d );
2381 break;
2382
2383 case Bytecodes::_dneg:
2384 a = pop_pair();
2385 b = _gvn.transform(new NegDNode (a));
2386 push_pair(b);
2387 break;
2388
2389 case Bytecodes::_drem:
2390 if (Matcher::has_match_rule(Op_ModD)) {
2391 // Generate a ModD node.
2392 b = pop_pair();
2393 a = pop_pair();
2394 // a % b
2395
2396 c = _gvn.transform( new ModDNode(0,a,b) );
2397 d = dprecision_rounding(c);
2398 push_pair( d );
2399 }
2400 else {
2401 // Generate a call.
2402 modd();
2403 }
2404 break;
2405
2406 case Bytecodes::_dcmpl:
2407 b = pop_pair();
2408 a = pop_pair();
2409 c = _gvn.transform( new CmpD3Node( a, b));
2410 push(c);
2411 break;
2412
2413 case Bytecodes::_dcmpg:
2414 b = pop_pair();
2415 a = pop_pair();
2416 // Same as dcmpl but need to flip the unordered case.
2417 // Commute the inputs, which negates the result sign except for unordered.
2418 // Flip the unordered as well by using CmpD3 which implements
2419 // unordered-lesser instead of unordered-greater semantics.
2420 // Finally, negate the result bits. Result is same as using a
2421 // CmpD3Greater except we did it with CmpD3 alone.
2422 c = _gvn.transform( new CmpD3Node( b, a));
2423 c = _gvn.transform( new SubINode(_gvn.intcon(0),c) );
2424 push(c);
2425 break;
2426
2427
2428 // Note for longs -> lo word is on TOS, hi word is on TOS - 1
2429 case Bytecodes::_land:
2430 b = pop_pair();
2431 a = pop_pair();
2432 c = _gvn.transform( new AndLNode(a,b) );
2433 push_pair(c);
2434 break;
2435 case Bytecodes::_lor:
2436 b = pop_pair();
2437 a = pop_pair();
2438 c = _gvn.transform( new OrLNode(a,b) );
2439 push_pair(c);
2440 break;
2441 case Bytecodes::_lxor:
2442 b = pop_pair();
2443 a = pop_pair();
2444 c = _gvn.transform( new XorLNode(a,b) );
2445 push_pair(c);
2446 break;
2447
2448 case Bytecodes::_lshl:
2449 b = pop(); // the shift count
2450 a = pop_pair(); // value to be shifted
2451 c = _gvn.transform( new LShiftLNode(a,b) );
2452 push_pair(c);
2453 break;
2454 case Bytecodes::_lshr:
2455 b = pop(); // the shift count
2456 a = pop_pair(); // value to be shifted
2457 c = _gvn.transform( new RShiftLNode(a,b) );
2458 push_pair(c);
2459 break;
2460 case Bytecodes::_lushr:
2461 b = pop(); // the shift count
2462 a = pop_pair(); // value to be shifted
2463 c = _gvn.transform( new URShiftLNode(a,b) );
2464 push_pair(c);
2465 break;
2466 case Bytecodes::_lmul:
2467 b = pop_pair();
2468 a = pop_pair();
2469 c = _gvn.transform( new MulLNode(a,b) );
2470 push_pair(c);
2471 break;
2472
2473 case Bytecodes::_lrem:
2474 // Must keep both values on the expression-stack during null-check
2475 assert(peek(0) == top(), "long word order");
2476 zero_check_long(peek(1));
2477 // Compile-time detect of null-exception?
2478 if (stopped()) return;
2479 b = pop_pair();
2480 a = pop_pair();
2481 c = _gvn.transform( new ModLNode(control(),a,b) );
2482 push_pair(c);
2483 break;
2484
2485 case Bytecodes::_ldiv:
2486 // Must keep both values on the expression-stack during null-check
2487 assert(peek(0) == top(), "long word order");
2488 zero_check_long(peek(1));
2489 // Compile-time detect of null-exception?
2490 if (stopped()) return;
2491 b = pop_pair();
2492 a = pop_pair();
2493 c = _gvn.transform( new DivLNode(control(),a,b) );
2494 push_pair(c);
2495 break;
2496
2497 case Bytecodes::_ladd:
2498 b = pop_pair();
2499 a = pop_pair();
2500 c = _gvn.transform( new AddLNode(a,b) );
2501 push_pair(c);
2502 break;
2503 case Bytecodes::_lsub:
2504 b = pop_pair();
2505 a = pop_pair();
2506 c = _gvn.transform( new SubLNode(a,b) );
2507 push_pair(c);
2508 break;
2509 case Bytecodes::_lcmp:
2510 // Safepoints are now inserted _before_ branches. The long-compare
2511 // bytecode painfully produces a 3-way value (-1,0,+1) which requires a
2512 // slew of control flow. These are usually followed by a CmpI vs zero and
2513 // a branch; this pattern then optimizes to the obvious long-compare and
2514 // branch. However, if the branch is backwards there's a Safepoint
2515 // inserted. The inserted Safepoint captures the JVM state at the
2516 // pre-branch point, i.e. it captures the 3-way value. Thus if a
2517 // long-compare is used to control a loop the debug info will force
2518 // computation of the 3-way value, even though the generated code uses a
2519 // long-compare and branch. We try to rectify the situation by inserting
2520 // a SafePoint here and have it dominate and kill the safepoint added at a
2521 // following backwards branch. At this point the JVM state merely holds 2
2522 // longs but not the 3-way value.
2523 switch (iter().next_bc()) {
2524 case Bytecodes::_ifgt:
2525 case Bytecodes::_iflt:
2526 case Bytecodes::_ifge:
2527 case Bytecodes::_ifle:
2528 case Bytecodes::_ifne:
2529 case Bytecodes::_ifeq:
2530 // If this is a backwards branch in the bytecodes, add Safepoint
2531 maybe_add_safepoint(iter().next_get_dest());
2532 default:
2533 break;
2534 }
2535 b = pop_pair();
2536 a = pop_pair();
2537 c = _gvn.transform( new CmpL3Node( a, b ));
2538 push(c);
2539 break;
2540
2541 case Bytecodes::_lneg:
2542 a = pop_pair();
2543 b = _gvn.transform( new SubLNode(longcon(0),a));
2544 push_pair(b);
2545 break;
2546 case Bytecodes::_l2i:
2547 a = pop_pair();
2548 push( _gvn.transform( new ConvL2INode(a)));
2549 break;
2550 case Bytecodes::_i2l:
2551 a = pop();
2552 b = _gvn.transform( new ConvI2LNode(a));
2553 push_pair(b);
2554 break;
2555 case Bytecodes::_i2b:
2556 // Sign extend
2557 a = pop();
2558 a = Compile::narrow_value(T_BYTE, a, nullptr, &_gvn, true);
2559 push(a);
2560 break;
2561 case Bytecodes::_i2s:
2562 a = pop();
2563 a = Compile::narrow_value(T_SHORT, a, nullptr, &_gvn, true);
2564 push(a);
2565 break;
2566 case Bytecodes::_i2c:
2567 a = pop();
2568 a = Compile::narrow_value(T_CHAR, a, nullptr, &_gvn, true);
2569 push(a);
2570 break;
2571
2572 case Bytecodes::_i2f:
2573 a = pop();
2574 b = _gvn.transform( new ConvI2FNode(a) ) ;
2575 c = precision_rounding(b);
2576 push (b);
2577 break;
2578
2579 case Bytecodes::_i2d:
2580 a = pop();
2581 b = _gvn.transform( new ConvI2DNode(a));
2582 push_pair(b);
2583 break;
2584
2585 case Bytecodes::_iinc: // Increment local
2586 i = iter().get_index(); // Get local index
2587 set_local( i, _gvn.transform( new AddINode( _gvn.intcon(iter().get_iinc_con()), local(i) ) ) );
2588 break;
2589
2590 // Exit points of synchronized methods must have an unlock node
2591 case Bytecodes::_return:
2592 return_current(nullptr);
2593 break;
2594
2595 case Bytecodes::_ireturn:
2596 case Bytecodes::_areturn:
2597 case Bytecodes::_freturn:
2598 return_current(pop());
2599 break;
2600 case Bytecodes::_lreturn:
2601 return_current(pop_pair());
2602 break;
2603 case Bytecodes::_dreturn:
2604 return_current(pop_pair());
2605 break;
2606
2607 case Bytecodes::_athrow:
2608 // null exception oop throws null pointer exception
2609 null_check(peek());
2610 if (stopped()) return;
2611 // Hook the thrown exception directly to subsequent handlers.
2612 if (BailoutToInterpreterForThrows) {
2613 // Keep method interpreted from now on.
2614 uncommon_trap(Deoptimization::Reason_unhandled,
2615 Deoptimization::Action_make_not_compilable);
2616 return;
2617 }
2618 if (env()->jvmti_can_post_on_exceptions()) {
2619 // check if we must post exception events, take uncommon trap if so (with must_throw = false)
2620 uncommon_trap_if_should_post_on_exceptions(Deoptimization::Reason_unhandled, false);
2621 }
2622 // Here if either can_post_on_exceptions or should_post_on_exceptions is false
2623 add_exception_state(make_exception_state(peek()));
2624 break;
2625
2626 case Bytecodes::_goto: // fall through
2627 case Bytecodes::_goto_w: {
2628 int target_bci = (bc() == Bytecodes::_goto) ? iter().get_dest() : iter().get_far_dest();
2629
2630 // If this is a backwards branch in the bytecodes, add Safepoint
2631 maybe_add_safepoint(target_bci);
2632
2633 // Merge the current control into the target basic block
2634 merge(target_bci);
2635
2636 // See if we can get some profile data and hand it off to the next block
2637 Block *target_block = block()->successor_for_bci(target_bci);
2638 if (target_block->pred_count() != 1) break;
2639 ciMethodData* methodData = method()->method_data();
2640 if (!methodData->is_mature()) break;
2641 ciProfileData* data = methodData->bci_to_data(bci());
2642 assert(data != nullptr && data->is_JumpData(), "need JumpData for taken branch");
2643 int taken = ((ciJumpData*)data)->taken();
2644 taken = method()->scale_count(taken);
2645 target_block->set_count(taken);
2646 break;
2647 }
2648
2649 case Bytecodes::_ifnull: btest = BoolTest::eq; goto handle_if_null;
2650 case Bytecodes::_ifnonnull: btest = BoolTest::ne; goto handle_if_null;
2651 handle_if_null:
2652 // If this is a backwards branch in the bytecodes, add Safepoint
2653 maybe_add_safepoint(iter().get_dest());
2654 a = null();
2655 b = pop();
2656 if (!_gvn.type(b)->speculative_maybe_null() &&
2657 !too_many_traps(Deoptimization::Reason_speculate_null_check)) {
2658 inc_sp(1);
2659 Node* null_ctl = top();
2660 b = null_check_oop(b, &null_ctl, true, true, true);
2661 assert(null_ctl->is_top(), "no null control here");
2662 dec_sp(1);
2663 } else if (_gvn.type(b)->speculative_always_null() &&
2664 !too_many_traps(Deoptimization::Reason_speculate_null_assert)) {
2665 inc_sp(1);
2666 b = null_assert(b);
2667 dec_sp(1);
2668 }
2669 c = _gvn.transform( new CmpPNode(b, a) );
2670 do_ifnull(btest, c);
2671 break;
2672
2673 case Bytecodes::_if_acmpeq: btest = BoolTest::eq; goto handle_if_acmp;
2674 case Bytecodes::_if_acmpne: btest = BoolTest::ne; goto handle_if_acmp;
2675 handle_if_acmp:
2676 // If this is a backwards branch in the bytecodes, add Safepoint
2677 maybe_add_safepoint(iter().get_dest());
2678 a = pop();
2679 b = pop();
2680 c = _gvn.transform( new CmpPNode(b, a) );
2681 c = optimize_cmp_with_klass(c);
2682 do_if(btest, c);
2683 break;
2684
2685 case Bytecodes::_ifeq: btest = BoolTest::eq; goto handle_ifxx;
2686 case Bytecodes::_ifne: btest = BoolTest::ne; goto handle_ifxx;
2687 case Bytecodes::_iflt: btest = BoolTest::lt; goto handle_ifxx;
2688 case Bytecodes::_ifle: btest = BoolTest::le; goto handle_ifxx;
2689 case Bytecodes::_ifgt: btest = BoolTest::gt; goto handle_ifxx;
2690 case Bytecodes::_ifge: btest = BoolTest::ge; goto handle_ifxx;
2691 handle_ifxx:
2692 // If this is a backwards branch in the bytecodes, add Safepoint
2693 maybe_add_safepoint(iter().get_dest());
2694 a = _gvn.intcon(0);
2695 b = pop();
2696 c = _gvn.transform( new CmpINode(b, a) );
2697 do_if(btest, c);
2698 break;
2699
2700 case Bytecodes::_if_icmpeq: btest = BoolTest::eq; goto handle_if_icmp;
2701 case Bytecodes::_if_icmpne: btest = BoolTest::ne; goto handle_if_icmp;
2702 case Bytecodes::_if_icmplt: btest = BoolTest::lt; goto handle_if_icmp;
2703 case Bytecodes::_if_icmple: btest = BoolTest::le; goto handle_if_icmp;
2704 case Bytecodes::_if_icmpgt: btest = BoolTest::gt; goto handle_if_icmp;
2705 case Bytecodes::_if_icmpge: btest = BoolTest::ge; goto handle_if_icmp;
2706 handle_if_icmp:
2707 // If this is a backwards branch in the bytecodes, add Safepoint
2708 maybe_add_safepoint(iter().get_dest());
2709 a = pop();
2710 b = pop();
2711 c = _gvn.transform( new CmpINode( b, a ) );
2712 do_if(btest, c);
2713 break;
2714
2715 case Bytecodes::_tableswitch:
2716 do_tableswitch();
2717 break;
2718
2719 case Bytecodes::_lookupswitch:
2720 do_lookupswitch();
2721 break;
2722
2723 case Bytecodes::_invokestatic:
2724 case Bytecodes::_invokedynamic:
2725 case Bytecodes::_invokespecial:
2726 case Bytecodes::_invokevirtual:
2727 case Bytecodes::_invokeinterface:
2728 do_call();
2729 break;
2730 case Bytecodes::_checkcast:
2731 do_checkcast();
2732 break;
2733 case Bytecodes::_instanceof:
2734 do_instanceof();
2735 break;
2736 case Bytecodes::_anewarray:
2737 do_anewarray();
2738 break;
2739 case Bytecodes::_newarray:
2740 do_newarray((BasicType)iter().get_index());
2741 break;
2742 case Bytecodes::_multianewarray:
2743 do_multianewarray();
2744 break;
2745 case Bytecodes::_new:
2746 do_new();
2747 break;
2748
2749 case Bytecodes::_jsr:
2750 case Bytecodes::_jsr_w:
2751 do_jsr();
2752 break;
2753
2754 case Bytecodes::_ret:
2755 do_ret();
2756 break;
2757
2758
2759 case Bytecodes::_monitorenter:
2760 do_monitor_enter();
2761 break;
2762
2763 case Bytecodes::_monitorexit:
2764 do_monitor_exit();
2765 break;
2766
2767 case Bytecodes::_breakpoint:
2768 // Breakpoint set concurrently to compile
2769 // %%% use an uncommon trap?
2770 C->record_failure("breakpoint in method");
2771 return;
2772
2773 default:
2774 #ifndef PRODUCT
2775 map()->dump(99);
2776 #endif
2777 tty->print("\nUnhandled bytecode %s\n", Bytecodes::name(bc()) );
2778 ShouldNotReachHere();
2779 }
2780
2781 #ifndef PRODUCT
2782 if (C->should_print_igv(1)) {
2783 IdealGraphPrinter* printer = C->igv_printer();
2784 char buffer[256];
2785 jio_snprintf(buffer, sizeof(buffer), "Bytecode %d: %s", bci(), Bytecodes::name(bc()));
2786 bool old = printer->traverse_outs();
2787 printer->set_traverse_outs(true);
2788 printer->print_method(buffer, 4);
2789 printer->set_traverse_outs(old);
2790 }
2791 #endif
2792 }