1 /*
2 * Copyright (c) 1998, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/ciMethodData.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "compiler/compileLog.hpp"
30 #include "interpreter/linkResolver.hpp"
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/idealKit.hpp"
40 #include "opto/matcher.hpp"
41 #include "opto/memnode.hpp"
42 #include "opto/mulnode.hpp"
43 #include "opto/opaquenode.hpp"
44 #include "opto/parse.hpp"
45 #include "opto/runtime.hpp"
46 #include "opto/valuetypenode.hpp"
47 #include "runtime/deoptimization.hpp"
48 #include "runtime/sharedRuntime.hpp"
49
50 #ifndef PRODUCT
51 extern int explicit_null_checks_inserted,
52 explicit_null_checks_elided;
53 #endif
54
55 //---------------------------------array_load----------------------------------
56 void Parse::array_load(BasicType bt) {
57 const Type* elemtype = Type::TOP;
58 Node* adr = array_addressing(bt, 0, &elemtype);
59 if (stopped()) return; // guaranteed null or range check
60
61 Node* idx = pop();
62 Node* ary = pop();
63
64 // Handle value type arrays
65 const TypeOopPtr* elemptr = elemtype->make_oopptr();
66 const TypeAryPtr* ary_t = _gvn.type(ary)->is_aryptr();
67 if (elemtype->isa_valuetype() != NULL) {
68 C->set_flattened_accesses();
69 // Load from flattened value type array
70 Node* vt = ValueTypeNode::make_from_flattened(this, elemtype->value_klass(), ary, adr);
71 push(vt);
72 return;
73 } else if (elemptr != NULL && elemptr->is_valuetypeptr() && !elemptr->maybe_null()) {
74 // Load from non-flattened but flattenable value type array (elements can never be null)
75 bt = T_VALUETYPE;
76 } else if (ValueArrayFlatten && elemptr != NULL && elemptr->can_be_value_type() &&
77 !ary_t->klass_is_exact() && (!elemptr->is_valuetypeptr() || elemptr->value_klass()->flatten_array())) {
78 // Cannot statically determine if array is flattened, emit runtime check
79 Node* ctl = control();
80 IdealKit ideal(this);
81 IdealVariable res(ideal);
82 ideal.declarations_done();
83 Node* kls = load_object_klass(ary);
84 Node* tag = load_lh_array_tag(kls);
85 ideal.if_then(tag, BoolTest::ne, intcon(Klass::_lh_array_tag_vt_value)); {
86 // non-flattened
87 sync_kit(ideal);
88 const TypeAryPtr* adr_type = TypeAryPtr::get_array_body_type(bt);
89 Node* ld = access_load_at(ary, adr, adr_type, elemptr, bt,
90 IN_HEAP | IS_ARRAY | C2_CONTROL_DEPENDENT_LOAD, ctl);
91 ideal.sync_kit(this);
92 ideal.set(res, ld);
93 } ideal.else_(); {
94 // flattened
95 sync_kit(ideal);
96 if (elemptr->is_valuetypeptr()) {
97 // Element type is known, cast and load from flattened representation
98 assert(elemptr->maybe_null(), "must be nullable");
99 ciValueKlass* vk = elemptr->value_klass();
100 assert(vk->flatten_array(), "must be flattenable");
101 ciArrayKlass* array_klass = ciArrayKlass::make(vk, /* never_null */ true);
102 const TypeAryPtr* arytype = TypeOopPtr::make_from_klass(array_klass)->isa_aryptr();
103 Node* cast = _gvn.transform(new CheckCastPPNode(control(), ary, arytype));
104 adr = array_element_address(cast, idx, T_VALUETYPE, ary_t->size(), control());
105 Node* vt = ValueTypeNode::make_from_flattened(this, vk, cast, adr)->allocate(this, false, false)->get_oop();
106 ideal.set(res, vt);
107 ideal.sync_kit(this);
108 } else {
109 // Element type is unknown, emit runtime call
110 assert(!ary_t->klass_is_exact(), "should not have exact type here");
111 Node* k_adr = basic_plus_adr(kls, in_bytes(ArrayKlass::element_klass_offset()));
112 Node* elem_klass = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), k_adr, TypeInstPtr::KLASS));
113 Node* obj_size = NULL;
114 kill_dead_locals();
115 inc_sp(2);
116 Node* alloc_obj = new_instance(elem_klass, NULL, &obj_size, /*deoptimize_on_exception=*/true);
117 dec_sp(2);
118
119 AllocateNode* alloc = AllocateNode::Ideal_allocation(alloc_obj, &_gvn);
120 assert(alloc->maybe_set_complete(&_gvn), "");
121 alloc->initialization()->set_complete_with_arraycopy();
122
123 // This membar keeps this access to an unknown flattened array
124 // correctly ordered with other unknown and known flattened
125 // array accesses.
126 insert_mem_bar_volatile(Op_MemBarCPUOrder, C->get_alias_index(TypeAryPtr::VALUES));
127
128 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
129 // Unknown value type might contain reference fields
130 if (!bs->array_copy_requires_gc_barriers(false, T_OBJECT, false, BarrierSetC2::Parsing)) {
131 int base_off = sizeof(instanceOopDesc);
132 Node* dst_base = basic_plus_adr(alloc_obj, base_off);
133 Node* countx = obj_size;
134 countx = _gvn.transform(new SubXNode(countx, MakeConX(base_off)));
135 countx = _gvn.transform(new URShiftXNode(countx, intcon(LogBytesPerLong)));
136
137 assert(Klass::_lh_log2_element_size_shift == 0, "use shift in place");
138 Node* lhp = basic_plus_adr(kls, in_bytes(Klass::layout_helper_offset()));
139 Node* elem_shift = make_load(NULL, lhp, TypeInt::INT, T_INT, MemNode::unordered);
140 uint header = arrayOopDesc::base_offset_in_bytes(T_VALUETYPE);
141 Node* base = basic_plus_adr(ary, header);
142 idx = Compile::conv_I2X_index(&_gvn, idx, TypeInt::POS, control());
143 Node* scale = _gvn.transform(new LShiftXNode(idx, elem_shift));
144 Node* adr = basic_plus_adr(ary, base, scale);
145
146 access_clone(adr, dst_base, countx, false);
147 } else {
148 ideal.sync_kit(this);
149 ideal.make_leaf_call(OptoRuntime::load_unknown_value_Type(),
150 CAST_FROM_FN_PTR(address, OptoRuntime::load_unknown_value),
151 "load_unknown_value",
152 ary, idx, alloc_obj);
153 sync_kit(ideal);
154 }
155
156 // This makes sure no other thread sees a partially initialized buffered value
157 insert_mem_bar_volatile(Op_MemBarStoreStore, Compile::AliasIdxRaw, alloc->proj_out_or_null(AllocateNode::RawAddress));
158
159 // Same as MemBarCPUOrder above: keep this unknown flattened
160 // array access correctly ordered with other flattened array
161 // access
162 insert_mem_bar_volatile(Op_MemBarCPUOrder, C->get_alias_index(TypeAryPtr::VALUES));
163
164 // Prevent any use of the newly allocated value before it is
165 // fully initialized
166 alloc_obj = new CastPPNode(alloc_obj, _gvn.type(alloc_obj), true);
167 alloc_obj->set_req(0, control());
168 alloc_obj = _gvn.transform(alloc_obj);
169
170 ideal.sync_kit(this);
171
172 ideal.set(res, alloc_obj);
173 }
174 } ideal.end_if();
175 sync_kit(ideal);
176 push_node(bt, _gvn.transform(ideal.value(res)));
177 return;
178 }
179
180 if (elemtype == TypeInt::BOOL) {
181 bt = T_BOOLEAN;
182 } else if (bt == T_OBJECT) {
183 elemtype = ary_t->elem()->make_oopptr();
184 }
185
186 const TypeAryPtr* adr_type = TypeAryPtr::get_array_body_type(bt);
187 Node* ld = access_load_at(ary, adr, adr_type, elemtype, bt,
188 IN_HEAP | IS_ARRAY | C2_CONTROL_DEPENDENT_LOAD);
189 if (bt == T_VALUETYPE) {
190 // Loading a non-flattened (but flattenable) value type from an array
191 assert(!gvn().type(ld)->maybe_null(), "value type array elements should never be null");
192 if (elemptr->value_klass()->is_scalarizable()) {
193 ld = ValueTypeNode::make_from_oop(this, ld, elemptr->value_klass());
194 }
195 }
196
197 push_node(bt, ld);
198 }
199
200
201 //--------------------------------array_store----------------------------------
202 void Parse::array_store(BasicType bt) {
203 const Type* elemtype = Type::TOP;
204 Node* adr = array_addressing(bt, type2size[bt], &elemtype);
205 if (stopped()) return; // guaranteed null or range check
206 Node* cast_val = NULL;
207 if (bt == T_OBJECT) {
208 cast_val = array_store_check();
209 if (stopped()) return;
210 }
211 Node* val = pop_node(bt); // Value to store
212 Node* idx = pop(); // Index in the array
213 Node* ary = pop(); // The array itself
214
215 const TypeAryPtr* ary_t = _gvn.type(ary)->is_aryptr();
216 if (bt == T_OBJECT) {
217 const TypeOopPtr* elemptr = elemtype->make_oopptr();
218 const Type* val_t = _gvn.type(val);
219 if (elemtype->isa_valuetype() != NULL) {
220 C->set_flattened_accesses();
221 // Store to flattened value type array
222 if (!cast_val->is_ValueType()) {
223 inc_sp(3);
224 cast_val = null_check(cast_val);
225 if (stopped()) return;
226 dec_sp(3);
227 cast_val = ValueTypeNode::make_from_oop(this, cast_val, elemtype->value_klass());
228 }
229 cast_val->as_ValueType()->store_flattened(this, ary, adr);
230 return;
231 } else if (elemptr->is_valuetypeptr() && !elemptr->maybe_null()) {
232 // Store to non-flattened but flattenable value type array (elements can never be null)
233 if (!cast_val->is_ValueType()) {
234 inc_sp(3);
235 cast_val = null_check(cast_val);
236 if (stopped()) return;
237 dec_sp(3);
238 }
239 } else if (elemptr->can_be_value_type() && (!ary_t->klass_is_exact() || elemptr->is_valuetypeptr()) &&
240 (val->is_ValueType() || val_t == TypePtr::NULL_PTR || val_t->is_oopptr()->can_be_value_type())) {
241 // Cannot statically determine if array is flattened, emit runtime check
242 ciValueKlass* vk = NULL;
243 // Try to determine the value klass
244 if (val->is_ValueType()) {
245 vk = val_t->value_klass();
246 } else if (elemptr->is_valuetypeptr()) {
247 vk = elemptr->value_klass();
248 }
249 if (ValueArrayFlatten && (vk == NULL || vk->flatten_array())) {
250 IdealKit ideal(this);
251 Node* kls = load_object_klass(ary);
252 Node* layout_val = load_lh_array_tag(kls);
253 ideal.if_then(layout_val, BoolTest::ne, intcon(Klass::_lh_array_tag_vt_value)); {
254 // non-flattened
255 sync_kit(ideal);
256 gen_value_array_null_guard(ary, val, 3);
257 const TypeAryPtr* adr_type = TypeAryPtr::get_array_body_type(bt);
258 elemtype = ary_t->elem()->make_oopptr();
259 access_store_at(ary, adr, adr_type, val, elemtype, bt, MO_UNORDERED | IN_HEAP | IS_ARRAY, false, false);
260 ideal.sync_kit(this);
261 } ideal.else_(); {
262 // flattened
263 if (!val->is_ValueType() && TypePtr::NULL_PTR->higher_equal(val_t)) {
264 // Add null check
265 sync_kit(ideal);
266 Node* null_ctl = top();
267 val = null_check_oop(val, &null_ctl);
268 if (null_ctl != top()) {
269 PreserveJVMState pjvms(this);
270 inc_sp(3);
271 set_control(null_ctl);
272 uncommon_trap(Deoptimization::Reason_null_check, Deoptimization::Action_none);
273 dec_sp(3);
274 }
275 ideal.sync_kit(this);
276 }
277 if (vk != NULL && !stopped()) {
278 // Element type is known, cast and store to flattened representation
279 sync_kit(ideal);
280 assert(vk->flatten_array(), "must be flattenable");
281 assert(elemptr->maybe_null(), "must be nullable");
282 ciArrayKlass* array_klass = ciArrayKlass::make(vk, /* never_null */ true);
283 const TypeAryPtr* arytype = TypeOopPtr::make_from_klass(array_klass)->isa_aryptr();
284 ary = _gvn.transform(new CheckCastPPNode(control(), ary, arytype));
285 adr = array_element_address(ary, idx, T_OBJECT, arytype->size(), control());
286 if (!val->is_ValueType()) {
287 assert(!gvn().type(val)->maybe_null(), "value type array elements should never be null");
288 val = ValueTypeNode::make_from_oop(this, val, vk);
289 }
290 val->as_ValueType()->store_flattened(this, ary, adr);
291 ideal.sync_kit(this);
292 } else if (!ideal.ctrl()->is_top()) {
293 // Element type is unknown, emit runtime call
294 assert(!ary_t->klass_is_exact(), "should not have exact type here");
295 sync_kit(ideal);
296
297 // This membar keeps this access to an unknown flattened
298 // array correctly ordered with other unknown and known
299 // flattened array accesses.
300 insert_mem_bar_volatile(Op_MemBarCPUOrder, C->get_alias_index(TypeAryPtr::VALUES));
301 ideal.sync_kit(this);
302
303 ideal.make_leaf_call(OptoRuntime::store_unknown_value_Type(),
304 CAST_FROM_FN_PTR(address, OptoRuntime::store_unknown_value),
305 "store_unknown_value",
306 val, ary, idx);
307
308 sync_kit(ideal);
309 // Same as MemBarCPUOrder above: keep this unknown
310 // flattened array access correctly ordered with other
311 // flattened array access
312 insert_mem_bar_volatile(Op_MemBarCPUOrder, C->get_alias_index(TypeAryPtr::VALUES));
313 ideal.sync_kit(this);
314
315 }
316 } ideal.end_if();
317 sync_kit(ideal);
318 return;
319 } else {
320 gen_value_array_null_guard(ary, val, 3);
321 }
322 }
323 }
324
325 if (elemtype == TypeInt::BOOL) {
326 bt = T_BOOLEAN;
327 } else if (bt == T_OBJECT) {
328 elemtype = ary_t->elem()->make_oopptr();
329 }
330
331 const TypeAryPtr* adr_type = TypeAryPtr::get_array_body_type(bt);
332
333 access_store_at(ary, adr, adr_type, val, elemtype, bt, MO_UNORDERED | IN_HEAP | IS_ARRAY);
334 }
335
336
337 //------------------------------array_addressing-------------------------------
338 // Pull array and index from the stack. Compute pointer-to-element.
339 Node* Parse::array_addressing(BasicType type, int vals, const Type* *result2) {
340 Node *idx = peek(0+vals); // Get from stack without popping
341 Node *ary = peek(1+vals); // in case of exception
342
343 // Null check the array base, with correct stack contents
344 ary = null_check(ary, T_ARRAY);
345 // Compile-time detect of null-exception?
346 if (stopped()) return top();
347
348 const TypeAryPtr* arytype = _gvn.type(ary)->is_aryptr();
349 const TypeInt* sizetype = arytype->size();
350 const Type* elemtype = arytype->elem();
351
352 if (UseUniqueSubclasses && result2 != NULL) {
353 const Type* el = elemtype->make_ptr();
354 if (el && el->isa_instptr()) {
355 const TypeInstPtr* toop = el->is_instptr();
356 if (toop->klass()->as_instance_klass()->unique_concrete_subklass()) {
357 // If we load from "AbstractClass[]" we must see "ConcreteSubClass".
358 const Type* subklass = Type::get_const_type(toop->klass());
359 elemtype = subklass->join_speculative(el);
360 }
361 }
362 }
363
364 // Check for big class initializers with all constant offsets
365 // feeding into a known-size array.
366 const TypeInt* idxtype = _gvn.type(idx)->is_int();
367 // See if the highest idx value is less than the lowest array bound,
368 // and if the idx value cannot be negative:
369 bool need_range_check = true;
370 if (idxtype->_hi < sizetype->_lo && idxtype->_lo >= 0) {
371 need_range_check = false;
372 if (C->log() != NULL) C->log()->elem("observe that='!need_range_check'");
373 }
374
375 ciKlass * arytype_klass = arytype->klass();
376 if ((arytype_klass != NULL) && (!arytype_klass->is_loaded())) {
377 // Only fails for some -Xcomp runs
378 // The class is unloaded. We have to run this bytecode in the interpreter.
379 uncommon_trap(Deoptimization::Reason_unloaded,
380 Deoptimization::Action_reinterpret,
381 arytype->klass(), "!loaded array");
382 return top();
383 }
384
385 // Do the range check
386 if (GenerateRangeChecks && need_range_check) {
387 Node* tst;
388 if (sizetype->_hi <= 0) {
389 // The greatest array bound is negative, so we can conclude that we're
390 // compiling unreachable code, but the unsigned compare trick used below
391 // only works with non-negative lengths. Instead, hack "tst" to be zero so
392 // the uncommon_trap path will always be taken.
393 tst = _gvn.intcon(0);
394 } else {
395 // Range is constant in array-oop, so we can use the original state of mem
396 Node* len = load_array_length(ary);
397
398 // Test length vs index (standard trick using unsigned compare)
399 Node* chk = _gvn.transform( new CmpUNode(idx, len) );
400 BoolTest::mask btest = BoolTest::lt;
401 tst = _gvn.transform( new BoolNode(chk, btest) );
402 }
403 RangeCheckNode* rc = new RangeCheckNode(control(), tst, PROB_MAX, COUNT_UNKNOWN);
404 _gvn.set_type(rc, rc->Value(&_gvn));
405 if (!tst->is_Con()) {
406 record_for_igvn(rc);
407 }
408 set_control(_gvn.transform(new IfTrueNode(rc)));
409 // Branch to failure if out of bounds
410 {
411 PreserveJVMState pjvms(this);
412 set_control(_gvn.transform(new IfFalseNode(rc)));
413 if (C->allow_range_check_smearing()) {
414 // Do not use builtin_throw, since range checks are sometimes
415 // made more stringent by an optimistic transformation.
416 // This creates "tentative" range checks at this point,
417 // which are not guaranteed to throw exceptions.
418 // See IfNode::Ideal, is_range_check, adjust_check.
419 uncommon_trap(Deoptimization::Reason_range_check,
420 Deoptimization::Action_make_not_entrant,
421 NULL, "range_check");
422 } else {
423 // If we have already recompiled with the range-check-widening
424 // heroic optimization turned off, then we must really be throwing
425 // range check exceptions.
426 builtin_throw(Deoptimization::Reason_range_check, idx);
427 }
428 }
429 }
430 // Check for always knowing you are throwing a range-check exception
431 if (stopped()) return top();
432
433 // Make array address computation control dependent to prevent it
434 // from floating above the range check during loop optimizations.
435 Node* ptr = array_element_address(ary, idx, type, sizetype, control());
436
437 if (result2 != NULL) *result2 = elemtype;
438
439 assert(ptr != top(), "top should go hand-in-hand with stopped");
440
441 return ptr;
442 }
443
444
445 // returns IfNode
446 IfNode* Parse::jump_if_fork_int(Node* a, Node* b, BoolTest::mask mask, float prob, float cnt) {
447 Node *cmp = _gvn.transform(new CmpINode(a, b)); // two cases: shiftcount > 32 and shiftcount <= 32
448 Node *tst = _gvn.transform(new BoolNode(cmp, mask));
449 IfNode *iff = create_and_map_if(control(), tst, prob, cnt);
450 return iff;
451 }
452
453 // return Region node
454 Node* Parse::jump_if_join(Node* iffalse, Node* iftrue) {
455 Node *region = new RegionNode(3); // 2 results
456 record_for_igvn(region);
457 region->init_req(1, iffalse);
458 region->init_req(2, iftrue );
459 _gvn.set_type(region, Type::CONTROL);
460 region = _gvn.transform(region);
461 set_control (region);
462 return region;
463 }
464
465 // sentinel value for the target bci to mark never taken branches
466 // (according to profiling)
467 static const int never_reached = INT_MAX;
468
469 //------------------------------helper for tableswitch-------------------------
470 void Parse::jump_if_true_fork(IfNode *iff, int dest_bci_if_true, int prof_table_index, bool unc) {
471 // True branch, use existing map info
472 { PreserveJVMState pjvms(this);
473 Node *iftrue = _gvn.transform( new IfTrueNode (iff) );
474 set_control( iftrue );
475 if (unc) {
476 repush_if_args();
477 uncommon_trap(Deoptimization::Reason_unstable_if,
478 Deoptimization::Action_reinterpret,
479 NULL,
480 "taken always");
481 } else {
482 assert(dest_bci_if_true != never_reached, "inconsistent dest");
483 profile_switch_case(prof_table_index);
484 merge_new_path(dest_bci_if_true);
485 }
486 }
487
488 // False branch
489 Node *iffalse = _gvn.transform( new IfFalseNode(iff) );
490 set_control( iffalse );
491 }
492
493 void Parse::jump_if_false_fork(IfNode *iff, int dest_bci_if_true, int prof_table_index, bool unc) {
494 // True branch, use existing map info
495 { PreserveJVMState pjvms(this);
496 Node *iffalse = _gvn.transform( new IfFalseNode (iff) );
497 set_control( iffalse );
498 if (unc) {
499 repush_if_args();
500 uncommon_trap(Deoptimization::Reason_unstable_if,
501 Deoptimization::Action_reinterpret,
502 NULL,
503 "taken never");
504 } else {
505 assert(dest_bci_if_true != never_reached, "inconsistent dest");
506 profile_switch_case(prof_table_index);
507 merge_new_path(dest_bci_if_true);
508 }
509 }
510
511 // False branch
512 Node *iftrue = _gvn.transform( new IfTrueNode(iff) );
513 set_control( iftrue );
514 }
515
516 void Parse::jump_if_always_fork(int dest_bci, int prof_table_index, bool unc) {
517 // False branch, use existing map and control()
518 if (unc) {
519 repush_if_args();
520 uncommon_trap(Deoptimization::Reason_unstable_if,
521 Deoptimization::Action_reinterpret,
522 NULL,
523 "taken never");
524 } else {
525 assert(dest_bci != never_reached, "inconsistent dest");
526 profile_switch_case(prof_table_index);
527 merge_new_path(dest_bci);
528 }
529 }
530
531
532 extern "C" {
533 static int jint_cmp(const void *i, const void *j) {
534 int a = *(jint *)i;
535 int b = *(jint *)j;
536 return a > b ? 1 : a < b ? -1 : 0;
537 }
538 }
539
540
541 // Default value for methodData switch indexing. Must be a negative value to avoid
542 // conflict with any legal switch index.
543 #define NullTableIndex -1
544
545 class SwitchRange : public StackObj {
546 // a range of integers coupled with a bci destination
547 jint _lo; // inclusive lower limit
548 jint _hi; // inclusive upper limit
549 int _dest;
550 int _table_index; // index into method data table
551 float _cnt; // how many times this range was hit according to profiling
552
553 public:
554 jint lo() const { return _lo; }
555 jint hi() const { return _hi; }
556 int dest() const { return _dest; }
557 int table_index() const { return _table_index; }
558 bool is_singleton() const { return _lo == _hi; }
559 float cnt() const { return _cnt; }
560
561 void setRange(jint lo, jint hi, int dest, int table_index, float cnt) {
562 assert(lo <= hi, "must be a non-empty range");
563 _lo = lo, _hi = hi; _dest = dest; _table_index = table_index; _cnt = cnt;
564 assert(_cnt >= 0, "");
565 }
566 bool adjoinRange(jint lo, jint hi, int dest, int table_index, float cnt, bool trim_ranges) {
567 assert(lo <= hi, "must be a non-empty range");
568 if (lo == _hi+1 && table_index == _table_index) {
569 // see merge_ranges() comment below
570 if (trim_ranges) {
571 if (cnt == 0) {
572 if (_cnt != 0) {
573 return false;
574 }
575 if (dest != _dest) {
576 _dest = never_reached;
577 }
578 } else {
579 if (_cnt == 0) {
580 return false;
581 }
582 if (dest != _dest) {
583 return false;
584 }
585 }
586 } else {
587 if (dest != _dest) {
588 return false;
589 }
590 }
591 _hi = hi;
592 _cnt += cnt;
593 return true;
594 }
595 return false;
596 }
597
598 void set (jint value, int dest, int table_index, float cnt) {
599 setRange(value, value, dest, table_index, cnt);
600 }
601 bool adjoin(jint value, int dest, int table_index, float cnt, bool trim_ranges) {
602 return adjoinRange(value, value, dest, table_index, cnt, trim_ranges);
603 }
604 bool adjoin(SwitchRange& other) {
605 return adjoinRange(other._lo, other._hi, other._dest, other._table_index, other._cnt, false);
606 }
607
608 void print() {
609 if (is_singleton())
610 tty->print(" {%d}=>%d (cnt=%f)", lo(), dest(), cnt());
611 else if (lo() == min_jint)
612 tty->print(" {..%d}=>%d (cnt=%f)", hi(), dest(), cnt());
613 else if (hi() == max_jint)
614 tty->print(" {%d..}=>%d (cnt=%f)", lo(), dest(), cnt());
615 else
616 tty->print(" {%d..%d}=>%d (cnt=%f)", lo(), hi(), dest(), cnt());
617 }
618 };
619
620 // We try to minimize the number of ranges and the size of the taken
621 // ones using profiling data. When ranges are created,
622 // SwitchRange::adjoinRange() only allows 2 adjoining ranges to merge
623 // if both were never hit or both were hit to build longer unreached
624 // ranges. Here, we now merge adjoining ranges with the same
625 // destination and finally set destination of unreached ranges to the
626 // special value never_reached because it can help minimize the number
627 // of tests that are necessary.
628 //
629 // For instance:
630 // [0, 1] to target1 sometimes taken
631 // [1, 2] to target1 never taken
632 // [2, 3] to target2 never taken
633 // would lead to:
634 // [0, 1] to target1 sometimes taken
635 // [1, 3] never taken
636 //
637 // (first 2 ranges to target1 are not merged)
638 static void merge_ranges(SwitchRange* ranges, int& rp) {
639 if (rp == 0) {
640 return;
641 }
642 int shift = 0;
643 for (int j = 0; j < rp; j++) {
644 SwitchRange& r1 = ranges[j-shift];
645 SwitchRange& r2 = ranges[j+1];
646 if (r1.adjoin(r2)) {
647 shift++;
648 } else if (shift > 0) {
649 ranges[j+1-shift] = r2;
650 }
651 }
652 rp -= shift;
653 for (int j = 0; j <= rp; j++) {
654 SwitchRange& r = ranges[j];
655 if (r.cnt() == 0 && r.dest() != never_reached) {
656 r.setRange(r.lo(), r.hi(), never_reached, r.table_index(), r.cnt());
657 }
658 }
659 }
660
661 //-------------------------------do_tableswitch--------------------------------
662 void Parse::do_tableswitch() {
663 Node* lookup = pop();
664 // Get information about tableswitch
665 int default_dest = iter().get_dest_table(0);
666 int lo_index = iter().get_int_table(1);
667 int hi_index = iter().get_int_table(2);
668 int len = hi_index - lo_index + 1;
669
670 if (len < 1) {
671 // If this is a backward branch, add safepoint
672 maybe_add_safepoint(default_dest);
673 merge(default_dest);
674 return;
675 }
676
677 ciMethodData* methodData = method()->method_data();
678 ciMultiBranchData* profile = NULL;
679 if (methodData->is_mature() && UseSwitchProfiling) {
680 ciProfileData* data = methodData->bci_to_data(bci());
681 if (data != NULL && data->is_MultiBranchData()) {
682 profile = (ciMultiBranchData*)data;
683 }
684 }
685 bool trim_ranges = !method_data_update() && !C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if);
686
687 // generate decision tree, using trichotomy when possible
688 int rnum = len+2;
689 bool makes_backward_branch = false;
690 SwitchRange* ranges = NEW_RESOURCE_ARRAY(SwitchRange, rnum);
691 int rp = -1;
692 if (lo_index != min_jint) {
693 uint cnt = 1;
694 if (profile != NULL) {
695 cnt = profile->default_count() / (hi_index != max_jint ? 2 : 1);
696 }
697 ranges[++rp].setRange(min_jint, lo_index-1, default_dest, NullTableIndex, cnt);
698 }
699 for (int j = 0; j < len; j++) {
700 jint match_int = lo_index+j;
701 int dest = iter().get_dest_table(j+3);
702 makes_backward_branch |= (dest <= bci());
703 int table_index = method_data_update() ? j : NullTableIndex;
704 uint cnt = 1;
705 if (profile != NULL) {
706 cnt = profile->count_at(j);
707 }
708 if (rp < 0 || !ranges[rp].adjoin(match_int, dest, table_index, cnt, trim_ranges)) {
709 ranges[++rp].set(match_int, dest, table_index, cnt);
710 }
711 }
712 jint highest = lo_index+(len-1);
713 assert(ranges[rp].hi() == highest, "");
714 if (highest != max_jint) {
715 uint cnt = 1;
716 if (profile != NULL) {
717 cnt = profile->default_count() / (lo_index != min_jint ? 2 : 1);
718 }
719 if (!ranges[rp].adjoinRange(highest+1, max_jint, default_dest, NullTableIndex, cnt, trim_ranges)) {
720 ranges[++rp].setRange(highest+1, max_jint, default_dest, NullTableIndex, cnt);
721 }
722 }
723 assert(rp < len+2, "not too many ranges");
724
725 if (trim_ranges) {
726 merge_ranges(ranges, rp);
727 }
728
729 // Safepoint in case if backward branch observed
730 if( makes_backward_branch && UseLoopSafepoints )
731 add_safepoint();
732
733 jump_switch_ranges(lookup, &ranges[0], &ranges[rp]);
734 }
735
736
737 //------------------------------do_lookupswitch--------------------------------
738 void Parse::do_lookupswitch() {
739 Node *lookup = pop(); // lookup value
740 // Get information about lookupswitch
741 int default_dest = iter().get_dest_table(0);
742 int len = iter().get_int_table(1);
743
744 if (len < 1) { // If this is a backward branch, add safepoint
745 maybe_add_safepoint(default_dest);
746 merge(default_dest);
747 return;
748 }
749
750 ciMethodData* methodData = method()->method_data();
751 ciMultiBranchData* profile = NULL;
752 if (methodData->is_mature() && UseSwitchProfiling) {
753 ciProfileData* data = methodData->bci_to_data(bci());
754 if (data != NULL && data->is_MultiBranchData()) {
755 profile = (ciMultiBranchData*)data;
756 }
757 }
758 bool trim_ranges = !method_data_update() && !C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if);
759
760 // generate decision tree, using trichotomy when possible
761 jint* table = NEW_RESOURCE_ARRAY(jint, len*3);
762 {
763 for (int j = 0; j < len; j++) {
764 table[3*j+0] = iter().get_int_table(2+2*j);
765 table[3*j+1] = iter().get_dest_table(2+2*j+1);
766 table[3*j+2] = profile == NULL ? 1 : profile->count_at(j);
767 }
768 qsort(table, len, 3*sizeof(table[0]), jint_cmp);
769 }
770
771 float defaults = 0;
772 jint prev = min_jint;
773 for (int j = 0; j < len; j++) {
774 jint match_int = table[3*j+0];
775 if (match_int != prev) {
776 defaults += (float)match_int - prev;
777 }
778 prev = match_int+1;
779 }
780 if (prev-1 != max_jint) {
781 defaults += (float)max_jint - prev + 1;
782 }
783 float default_cnt = 1;
784 if (profile != NULL) {
785 default_cnt = profile->default_count()/defaults;
786 }
787
788 int rnum = len*2+1;
789 bool makes_backward_branch = false;
790 SwitchRange* ranges = NEW_RESOURCE_ARRAY(SwitchRange, rnum);
791 int rp = -1;
792 for (int j = 0; j < len; j++) {
793 jint match_int = table[3*j+0];
794 int dest = table[3*j+1];
795 int cnt = table[3*j+2];
796 int next_lo = rp < 0 ? min_jint : ranges[rp].hi()+1;
797 int table_index = method_data_update() ? j : NullTableIndex;
798 makes_backward_branch |= (dest <= bci());
799 float c = default_cnt * ((float)match_int - next_lo);
800 if (match_int != next_lo && (rp < 0 || !ranges[rp].adjoinRange(next_lo, match_int-1, default_dest, NullTableIndex, c, trim_ranges))) {
801 assert(default_dest != never_reached, "sentinel value for dead destinations");
802 ranges[++rp].setRange(next_lo, match_int-1, default_dest, NullTableIndex, c);
803 }
804 if (rp < 0 || !ranges[rp].adjoin(match_int, dest, table_index, cnt, trim_ranges)) {
805 assert(dest != never_reached, "sentinel value for dead destinations");
806 ranges[++rp].set(match_int, dest, table_index, cnt);
807 }
808 }
809 jint highest = table[3*(len-1)];
810 assert(ranges[rp].hi() == highest, "");
811 if (highest != max_jint &&
812 !ranges[rp].adjoinRange(highest+1, max_jint, default_dest, NullTableIndex, default_cnt * ((float)max_jint - highest), trim_ranges)) {
813 ranges[++rp].setRange(highest+1, max_jint, default_dest, NullTableIndex, default_cnt * ((float)max_jint - highest));
814 }
815 assert(rp < rnum, "not too many ranges");
816
817 if (trim_ranges) {
818 merge_ranges(ranges, rp);
819 }
820
821 // Safepoint in case backward branch observed
822 if (makes_backward_branch && UseLoopSafepoints)
823 add_safepoint();
824
825 jump_switch_ranges(lookup, &ranges[0], &ranges[rp]);
826 }
827
828 static float if_prob(float taken_cnt, float total_cnt) {
829 assert(taken_cnt <= total_cnt, "");
830 if (total_cnt == 0) {
831 return PROB_FAIR;
832 }
833 float p = taken_cnt / total_cnt;
834 return MIN2(MAX2(p, PROB_MIN), PROB_MAX);
835 }
836
837 static float if_cnt(float cnt) {
838 if (cnt == 0) {
839 return COUNT_UNKNOWN;
840 }
841 return cnt;
842 }
843
844 static float sum_of_cnts(SwitchRange *lo, SwitchRange *hi) {
845 float total_cnt = 0;
846 for (SwitchRange* sr = lo; sr <= hi; sr++) {
847 total_cnt += sr->cnt();
848 }
849 return total_cnt;
850 }
851
852 class SwitchRanges : public ResourceObj {
853 public:
854 SwitchRange* _lo;
855 SwitchRange* _hi;
856 SwitchRange* _mid;
857 float _cost;
858
859 enum {
860 Start,
861 LeftDone,
862 RightDone,
863 Done
864 } _state;
865
866 SwitchRanges(SwitchRange *lo, SwitchRange *hi)
867 : _lo(lo), _hi(hi), _mid(NULL),
868 _cost(0), _state(Start) {
869 }
870
871 SwitchRanges()
872 : _lo(NULL), _hi(NULL), _mid(NULL),
873 _cost(0), _state(Start) {}
874 };
875
876 // Estimate cost of performing a binary search on lo..hi
877 static float compute_tree_cost(SwitchRange *lo, SwitchRange *hi, float total_cnt) {
878 GrowableArray<SwitchRanges> tree;
879 SwitchRanges root(lo, hi);
880 tree.push(root);
881
882 float cost = 0;
883 do {
884 SwitchRanges& r = *tree.adr_at(tree.length()-1);
885 if (r._hi != r._lo) {
886 if (r._mid == NULL) {
887 float r_cnt = sum_of_cnts(r._lo, r._hi);
888
889 if (r_cnt == 0) {
890 tree.pop();
891 cost = 0;
892 continue;
893 }
894
895 SwitchRange* mid = NULL;
896 mid = r._lo;
897 for (float cnt = 0; ; ) {
898 assert(mid <= r._hi, "out of bounds");
899 cnt += mid->cnt();
900 if (cnt > r_cnt / 2) {
901 break;
902 }
903 mid++;
904 }
905 assert(mid <= r._hi, "out of bounds");
906 r._mid = mid;
907 r._cost = r_cnt / total_cnt;
908 }
909 r._cost += cost;
910 if (r._state < SwitchRanges::LeftDone && r._mid > r._lo) {
911 cost = 0;
912 r._state = SwitchRanges::LeftDone;
913 tree.push(SwitchRanges(r._lo, r._mid-1));
914 } else if (r._state < SwitchRanges::RightDone) {
915 cost = 0;
916 r._state = SwitchRanges::RightDone;
917 tree.push(SwitchRanges(r._mid == r._lo ? r._mid+1 : r._mid, r._hi));
918 } else {
919 tree.pop();
920 cost = r._cost;
921 }
922 } else {
923 tree.pop();
924 cost = r._cost;
925 }
926 } while (tree.length() > 0);
927
928
929 return cost;
930 }
931
932 // It sometimes pays off to test most common ranges before the binary search
933 void Parse::linear_search_switch_ranges(Node* key_val, SwitchRange*& lo, SwitchRange*& hi) {
934 uint nr = hi - lo + 1;
935 float total_cnt = sum_of_cnts(lo, hi);
936
937 float min = compute_tree_cost(lo, hi, total_cnt);
938 float extra = 1;
939 float sub = 0;
940
941 SwitchRange* array1 = lo;
942 SwitchRange* array2 = NEW_RESOURCE_ARRAY(SwitchRange, nr);
943
944 SwitchRange* ranges = NULL;
945
946 while (nr >= 2) {
947 assert(lo == array1 || lo == array2, "one the 2 already allocated arrays");
948 ranges = (lo == array1) ? array2 : array1;
949
950 // Find highest frequency range
951 SwitchRange* candidate = lo;
952 for (SwitchRange* sr = lo+1; sr <= hi; sr++) {
953 if (sr->cnt() > candidate->cnt()) {
954 candidate = sr;
955 }
956 }
957 SwitchRange most_freq = *candidate;
958 if (most_freq.cnt() == 0) {
959 break;
960 }
961
962 // Copy remaining ranges into another array
963 int shift = 0;
964 for (uint i = 0; i < nr; i++) {
965 SwitchRange* sr = &lo[i];
966 if (sr != candidate) {
967 ranges[i-shift] = *sr;
968 } else {
969 shift++;
970 if (i > 0 && i < nr-1) {
971 SwitchRange prev = lo[i-1];
972 prev.setRange(prev.lo(), sr->hi(), prev.dest(), prev.table_index(), prev.cnt());
973 if (prev.adjoin(lo[i+1])) {
974 shift++;
975 i++;
976 }
977 ranges[i-shift] = prev;
978 }
979 }
980 }
981 nr -= shift;
982
983 // Evaluate cost of testing the most common range and performing a
984 // binary search on the other ranges
985 float cost = extra + compute_tree_cost(&ranges[0], &ranges[nr-1], total_cnt);
986 if (cost >= min) {
987 break;
988 }
989 // swap arrays
990 lo = &ranges[0];
991 hi = &ranges[nr-1];
992
993 // It pays off: emit the test for the most common range
994 assert(most_freq.cnt() > 0, "must be taken");
995 Node* val = _gvn.transform(new SubINode(key_val, _gvn.intcon(most_freq.lo())));
996 Node* cmp = _gvn.transform(new CmpUNode(val, _gvn.intcon(most_freq.hi() - most_freq.lo())));
997 Node* tst = _gvn.transform(new BoolNode(cmp, BoolTest::le));
998 IfNode* iff = create_and_map_if(control(), tst, if_prob(most_freq.cnt(), total_cnt), if_cnt(most_freq.cnt()));
999 jump_if_true_fork(iff, most_freq.dest(), most_freq.table_index(), false);
1000
1001 sub += most_freq.cnt() / total_cnt;
1002 extra += 1 - sub;
1003 min = cost;
1004 }
1005 }
1006
1007 //----------------------------create_jump_tables-------------------------------
1008 bool Parse::create_jump_tables(Node* key_val, SwitchRange* lo, SwitchRange* hi) {
1009 // Are jumptables enabled
1010 if (!UseJumpTables) return false;
1011
1012 // Are jumptables supported
1013 if (!Matcher::has_match_rule(Op_Jump)) return false;
1014
1015 // Don't make jump table if profiling
1016 if (method_data_update()) return false;
1017
1018 bool trim_ranges = !C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if);
1019
1020 // Decide if a guard is needed to lop off big ranges at either (or
1021 // both) end(s) of the input set. We'll call this the default target
1022 // even though we can't be sure that it is the true "default".
1023
1024 bool needs_guard = false;
1025 int default_dest;
1026 int64_t total_outlier_size = 0;
1027 int64_t hi_size = ((int64_t)hi->hi()) - ((int64_t)hi->lo()) + 1;
1028 int64_t lo_size = ((int64_t)lo->hi()) - ((int64_t)lo->lo()) + 1;
1029
1030 if (lo->dest() == hi->dest()) {
1031 total_outlier_size = hi_size + lo_size;
1032 default_dest = lo->dest();
1033 } else if (lo_size > hi_size) {
1034 total_outlier_size = lo_size;
1035 default_dest = lo->dest();
1036 } else {
1037 total_outlier_size = hi_size;
1038 default_dest = hi->dest();
1039 }
1040
1041 float total = sum_of_cnts(lo, hi);
1042 float cost = compute_tree_cost(lo, hi, total);
1043
1044 // If a guard test will eliminate very sparse end ranges, then
1045 // it is worth the cost of an extra jump.
1046 float trimmed_cnt = 0;
1047 if (total_outlier_size > (MaxJumpTableSparseness * 4)) {
1048 needs_guard = true;
1049 if (default_dest == lo->dest()) {
1050 trimmed_cnt += lo->cnt();
1051 lo++;
1052 }
1053 if (default_dest == hi->dest()) {
1054 trimmed_cnt += hi->cnt();
1055 hi--;
1056 }
1057 }
1058
1059 // Find the total number of cases and ranges
1060 int64_t num_cases = ((int64_t)hi->hi()) - ((int64_t)lo->lo()) + 1;
1061 int num_range = hi - lo + 1;
1062
1063 // Don't create table if: too large, too small, or too sparse.
1064 if (num_cases > MaxJumpTableSize)
1065 return false;
1066 if (UseSwitchProfiling) {
1067 // MinJumpTableSize is set so with a well balanced binary tree,
1068 // when the number of ranges is MinJumpTableSize, it's cheaper to
1069 // go through a JumpNode that a tree of IfNodes. Average cost of a
1070 // tree of IfNodes with MinJumpTableSize is
1071 // log2f(MinJumpTableSize) comparisons. So if the cost computed
1072 // from profile data is less than log2f(MinJumpTableSize) then
1073 // going with the binary search is cheaper.
1074 if (cost < log2f(MinJumpTableSize)) {
1075 return false;
1076 }
1077 } else {
1078 if (num_cases < MinJumpTableSize)
1079 return false;
1080 }
1081 if (num_cases > (MaxJumpTableSparseness * num_range))
1082 return false;
1083
1084 // Normalize table lookups to zero
1085 int lowval = lo->lo();
1086 key_val = _gvn.transform( new SubINode(key_val, _gvn.intcon(lowval)) );
1087
1088 // Generate a guard to protect against input keyvals that aren't
1089 // in the switch domain.
1090 if (needs_guard) {
1091 Node* size = _gvn.intcon(num_cases);
1092 Node* cmp = _gvn.transform(new CmpUNode(key_val, size));
1093 Node* tst = _gvn.transform(new BoolNode(cmp, BoolTest::ge));
1094 IfNode* iff = create_and_map_if(control(), tst, if_prob(trimmed_cnt, total), if_cnt(trimmed_cnt));
1095 jump_if_true_fork(iff, default_dest, NullTableIndex, trim_ranges && trimmed_cnt == 0);
1096
1097 total -= trimmed_cnt;
1098 }
1099
1100 // Create an ideal node JumpTable that has projections
1101 // of all possible ranges for a switch statement
1102 // The key_val input must be converted to a pointer offset and scaled.
1103 // Compare Parse::array_addressing above.
1104
1105 // Clean the 32-bit int into a real 64-bit offset.
1106 // Otherwise, the jint value 0 might turn into an offset of 0x0800000000.
1107 const TypeInt* ikeytype = TypeInt::make(0, num_cases, Type::WidenMin);
1108 // Make I2L conversion control dependent to prevent it from
1109 // floating above the range check during loop optimizations.
1110 key_val = C->conv_I2X_index(&_gvn, key_val, ikeytype, control());
1111
1112 // Shift the value by wordsize so we have an index into the table, rather
1113 // than a switch value
1114 Node *shiftWord = _gvn.MakeConX(wordSize);
1115 key_val = _gvn.transform( new MulXNode( key_val, shiftWord));
1116
1117 // Create the JumpNode
1118 Arena* arena = C->comp_arena();
1119 float* probs = (float*)arena->Amalloc(sizeof(float)*num_cases);
1120 int i = 0;
1121 if (total == 0) {
1122 for (SwitchRange* r = lo; r <= hi; r++) {
1123 for (int64_t j = r->lo(); j <= r->hi(); j++, i++) {
1124 probs[i] = 1.0F / num_cases;
1125 }
1126 }
1127 } else {
1128 for (SwitchRange* r = lo; r <= hi; r++) {
1129 float prob = r->cnt()/total;
1130 for (int64_t j = r->lo(); j <= r->hi(); j++, i++) {
1131 probs[i] = prob / (r->hi() - r->lo() + 1);
1132 }
1133 }
1134 }
1135
1136 ciMethodData* methodData = method()->method_data();
1137 ciMultiBranchData* profile = NULL;
1138 if (methodData->is_mature()) {
1139 ciProfileData* data = methodData->bci_to_data(bci());
1140 if (data != NULL && data->is_MultiBranchData()) {
1141 profile = (ciMultiBranchData*)data;
1142 }
1143 }
1144
1145 Node* jtn = _gvn.transform(new JumpNode(control(), key_val, num_cases, probs, profile == NULL ? COUNT_UNKNOWN : total));
1146
1147 // These are the switch destinations hanging off the jumpnode
1148 i = 0;
1149 for (SwitchRange* r = lo; r <= hi; r++) {
1150 for (int64_t j = r->lo(); j <= r->hi(); j++, i++) {
1151 Node* input = _gvn.transform(new JumpProjNode(jtn, i, r->dest(), (int)(j - lowval)));
1152 {
1153 PreserveJVMState pjvms(this);
1154 set_control(input);
1155 jump_if_always_fork(r->dest(), r->table_index(), trim_ranges && r->cnt() == 0);
1156 }
1157 }
1158 }
1159 assert(i == num_cases, "miscount of cases");
1160 stop_and_kill_map(); // no more uses for this JVMS
1161 return true;
1162 }
1163
1164 //----------------------------jump_switch_ranges-------------------------------
1165 void Parse::jump_switch_ranges(Node* key_val, SwitchRange *lo, SwitchRange *hi, int switch_depth) {
1166 Block* switch_block = block();
1167 bool trim_ranges = !method_data_update() && !C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if);
1168
1169 if (switch_depth == 0) {
1170 // Do special processing for the top-level call.
1171 assert(lo->lo() == min_jint, "initial range must exhaust Type::INT");
1172 assert(hi->hi() == max_jint, "initial range must exhaust Type::INT");
1173
1174 // Decrement pred-numbers for the unique set of nodes.
1175 #ifdef ASSERT
1176 if (!trim_ranges) {
1177 // Ensure that the block's successors are a (duplicate-free) set.
1178 int successors_counted = 0; // block occurrences in [hi..lo]
1179 int unique_successors = switch_block->num_successors();
1180 for (int i = 0; i < unique_successors; i++) {
1181 Block* target = switch_block->successor_at(i);
1182
1183 // Check that the set of successors is the same in both places.
1184 int successors_found = 0;
1185 for (SwitchRange* p = lo; p <= hi; p++) {
1186 if (p->dest() == target->start()) successors_found++;
1187 }
1188 assert(successors_found > 0, "successor must be known");
1189 successors_counted += successors_found;
1190 }
1191 assert(successors_counted == (hi-lo)+1, "no unexpected successors");
1192 }
1193 #endif
1194
1195 // Maybe prune the inputs, based on the type of key_val.
1196 jint min_val = min_jint;
1197 jint max_val = max_jint;
1198 const TypeInt* ti = key_val->bottom_type()->isa_int();
1199 if (ti != NULL) {
1200 min_val = ti->_lo;
1201 max_val = ti->_hi;
1202 assert(min_val <= max_val, "invalid int type");
1203 }
1204 while (lo->hi() < min_val) {
1205 lo++;
1206 }
1207 if (lo->lo() < min_val) {
1208 lo->setRange(min_val, lo->hi(), lo->dest(), lo->table_index(), lo->cnt());
1209 }
1210 while (hi->lo() > max_val) {
1211 hi--;
1212 }
1213 if (hi->hi() > max_val) {
1214 hi->setRange(hi->lo(), max_val, hi->dest(), hi->table_index(), hi->cnt());
1215 }
1216
1217 linear_search_switch_ranges(key_val, lo, hi);
1218 }
1219
1220 #ifndef PRODUCT
1221 if (switch_depth == 0) {
1222 _max_switch_depth = 0;
1223 _est_switch_depth = log2_intptr((hi-lo+1)-1)+1;
1224 }
1225 #endif
1226
1227 assert(lo <= hi, "must be a non-empty set of ranges");
1228 if (lo == hi) {
1229 jump_if_always_fork(lo->dest(), lo->table_index(), trim_ranges && lo->cnt() == 0);
1230 } else {
1231 assert(lo->hi() == (lo+1)->lo()-1, "contiguous ranges");
1232 assert(hi->lo() == (hi-1)->hi()+1, "contiguous ranges");
1233
1234 if (create_jump_tables(key_val, lo, hi)) return;
1235
1236 SwitchRange* mid = NULL;
1237 float total_cnt = sum_of_cnts(lo, hi);
1238
1239 int nr = hi - lo + 1;
1240 if (UseSwitchProfiling) {
1241 // Don't keep the binary search tree balanced: pick up mid point
1242 // that split frequencies in half.
1243 float cnt = 0;
1244 for (SwitchRange* sr = lo; sr <= hi; sr++) {
1245 cnt += sr->cnt();
1246 if (cnt >= total_cnt / 2) {
1247 mid = sr;
1248 break;
1249 }
1250 }
1251 } else {
1252 mid = lo + nr/2;
1253
1254 // if there is an easy choice, pivot at a singleton:
1255 if (nr > 3 && !mid->is_singleton() && (mid-1)->is_singleton()) mid--;
1256
1257 assert(lo < mid && mid <= hi, "good pivot choice");
1258 assert(nr != 2 || mid == hi, "should pick higher of 2");
1259 assert(nr != 3 || mid == hi-1, "should pick middle of 3");
1260 }
1261
1262
1263 Node *test_val = _gvn.intcon(mid == lo ? mid->hi() : mid->lo());
1264
1265 if (mid->is_singleton()) {
1266 IfNode *iff_ne = jump_if_fork_int(key_val, test_val, BoolTest::ne, 1-if_prob(mid->cnt(), total_cnt), if_cnt(mid->cnt()));
1267 jump_if_false_fork(iff_ne, mid->dest(), mid->table_index(), trim_ranges && mid->cnt() == 0);
1268
1269 // Special Case: If there are exactly three ranges, and the high
1270 // and low range each go to the same place, omit the "gt" test,
1271 // since it will not discriminate anything.
1272 bool eq_test_only = (hi == lo+2 && hi->dest() == lo->dest() && mid == hi-1) || mid == lo;
1273
1274 // if there is a higher range, test for it and process it:
1275 if (mid < hi && !eq_test_only) {
1276 // two comparisons of same values--should enable 1 test for 2 branches
1277 // Use BoolTest::le instead of BoolTest::gt
1278 float cnt = sum_of_cnts(lo, mid-1);
1279 IfNode *iff_le = jump_if_fork_int(key_val, test_val, BoolTest::le, if_prob(cnt, total_cnt), if_cnt(cnt));
1280 Node *iftrue = _gvn.transform( new IfTrueNode(iff_le) );
1281 Node *iffalse = _gvn.transform( new IfFalseNode(iff_le) );
1282 { PreserveJVMState pjvms(this);
1283 set_control(iffalse);
1284 jump_switch_ranges(key_val, mid+1, hi, switch_depth+1);
1285 }
1286 set_control(iftrue);
1287 }
1288
1289 } else {
1290 // mid is a range, not a singleton, so treat mid..hi as a unit
1291 float cnt = sum_of_cnts(mid == lo ? mid+1 : mid, hi);
1292 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));
1293
1294 // if there is a higher range, test for it and process it:
1295 if (mid == hi) {
1296 jump_if_true_fork(iff_ge, mid->dest(), mid->table_index(), trim_ranges && cnt == 0);
1297 } else {
1298 Node *iftrue = _gvn.transform( new IfTrueNode(iff_ge) );
1299 Node *iffalse = _gvn.transform( new IfFalseNode(iff_ge) );
1300 { PreserveJVMState pjvms(this);
1301 set_control(iftrue);
1302 jump_switch_ranges(key_val, mid == lo ? mid+1 : mid, hi, switch_depth+1);
1303 }
1304 set_control(iffalse);
1305 }
1306 }
1307
1308 // in any case, process the lower range
1309 if (mid == lo) {
1310 if (mid->is_singleton()) {
1311 jump_switch_ranges(key_val, lo+1, hi, switch_depth+1);
1312 } else {
1313 jump_if_always_fork(lo->dest(), lo->table_index(), trim_ranges && lo->cnt() == 0);
1314 }
1315 } else {
1316 jump_switch_ranges(key_val, lo, mid-1, switch_depth+1);
1317 }
1318 }
1319
1320 // Decrease pred_count for each successor after all is done.
1321 if (switch_depth == 0) {
1322 int unique_successors = switch_block->num_successors();
1323 for (int i = 0; i < unique_successors; i++) {
1324 Block* target = switch_block->successor_at(i);
1325 // Throw away the pre-allocated path for each unique successor.
1326 target->next_path_num();
1327 }
1328 }
1329
1330 #ifndef PRODUCT
1331 _max_switch_depth = MAX2(switch_depth, _max_switch_depth);
1332 if (TraceOptoParse && Verbose && WizardMode && switch_depth == 0) {
1333 SwitchRange* r;
1334 int nsing = 0;
1335 for( r = lo; r <= hi; r++ ) {
1336 if( r->is_singleton() ) nsing++;
1337 }
1338 tty->print(">>> ");
1339 _method->print_short_name();
1340 tty->print_cr(" switch decision tree");
1341 tty->print_cr(" %d ranges (%d singletons), max_depth=%d, est_depth=%d",
1342 (int) (hi-lo+1), nsing, _max_switch_depth, _est_switch_depth);
1343 if (_max_switch_depth > _est_switch_depth) {
1344 tty->print_cr("******** BAD SWITCH DEPTH ********");
1345 }
1346 tty->print(" ");
1347 for( r = lo; r <= hi; r++ ) {
1348 r->print();
1349 }
1350 tty->cr();
1351 }
1352 #endif
1353 }
1354
1355 void Parse::modf() {
1356 Node *f2 = pop();
1357 Node *f1 = pop();
1358 Node* c = make_runtime_call(RC_LEAF, OptoRuntime::modf_Type(),
1359 CAST_FROM_FN_PTR(address, SharedRuntime::frem),
1360 "frem", NULL, //no memory effects
1361 f1, f2);
1362 Node* res = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 0));
1363
1364 push(res);
1365 }
1366
1367 void Parse::modd() {
1368 Node *d2 = pop_pair();
1369 Node *d1 = pop_pair();
1370 Node* c = make_runtime_call(RC_LEAF, OptoRuntime::Math_DD_D_Type(),
1371 CAST_FROM_FN_PTR(address, SharedRuntime::drem),
1372 "drem", NULL, //no memory effects
1373 d1, top(), d2, top());
1374 Node* res_d = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 0));
1375
1376 #ifdef ASSERT
1377 Node* res_top = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 1));
1378 assert(res_top == top(), "second value must be top");
1379 #endif
1380
1381 push_pair(res_d);
1382 }
1383
1384 void Parse::l2f() {
1385 Node* f2 = pop();
1386 Node* f1 = pop();
1387 Node* c = make_runtime_call(RC_LEAF, OptoRuntime::l2f_Type(),
1388 CAST_FROM_FN_PTR(address, SharedRuntime::l2f),
1389 "l2f", NULL, //no memory effects
1390 f1, f2);
1391 Node* res = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 0));
1392
1393 push(res);
1394 }
1395
1396 void Parse::do_irem() {
1397 // Must keep both values on the expression-stack during null-check
1398 zero_check_int(peek());
1399 // Compile-time detect of null-exception?
1400 if (stopped()) return;
1401
1402 Node* b = pop();
1403 Node* a = pop();
1404
1405 const Type *t = _gvn.type(b);
1406 if (t != Type::TOP) {
1407 const TypeInt *ti = t->is_int();
1408 if (ti->is_con()) {
1409 int divisor = ti->get_con();
1410 // check for positive power of 2
1411 if (divisor > 0 &&
1412 (divisor & ~(divisor-1)) == divisor) {
1413 // yes !
1414 Node *mask = _gvn.intcon((divisor - 1));
1415 // Sigh, must handle negative dividends
1416 Node *zero = _gvn.intcon(0);
1417 IfNode *ifff = jump_if_fork_int(a, zero, BoolTest::lt, PROB_FAIR, COUNT_UNKNOWN);
1418 Node *iff = _gvn.transform( new IfFalseNode(ifff) );
1419 Node *ift = _gvn.transform( new IfTrueNode (ifff) );
1420 Node *reg = jump_if_join(ift, iff);
1421 Node *phi = PhiNode::make(reg, NULL, TypeInt::INT);
1422 // Negative path; negate/and/negate
1423 Node *neg = _gvn.transform( new SubINode(zero, a) );
1424 Node *andn= _gvn.transform( new AndINode(neg, mask) );
1425 Node *negn= _gvn.transform( new SubINode(zero, andn) );
1426 phi->init_req(1, negn);
1427 // Fast positive case
1428 Node *andx = _gvn.transform( new AndINode(a, mask) );
1429 phi->init_req(2, andx);
1430 // Push the merge
1431 push( _gvn.transform(phi) );
1432 return;
1433 }
1434 }
1435 }
1436 // Default case
1437 push( _gvn.transform( new ModINode(control(),a,b) ) );
1438 }
1439
1440 // Handle jsr and jsr_w bytecode
1441 void Parse::do_jsr() {
1442 assert(bc() == Bytecodes::_jsr || bc() == Bytecodes::_jsr_w, "wrong bytecode");
1443
1444 // Store information about current state, tagged with new _jsr_bci
1445 int return_bci = iter().next_bci();
1446 int jsr_bci = (bc() == Bytecodes::_jsr) ? iter().get_dest() : iter().get_far_dest();
1447
1448 // Update method data
1449 profile_taken_branch(jsr_bci);
1450
1451 // The way we do things now, there is only one successor block
1452 // for the jsr, because the target code is cloned by ciTypeFlow.
1453 Block* target = successor_for_bci(jsr_bci);
1454
1455 // What got pushed?
1456 const Type* ret_addr = target->peek();
1457 assert(ret_addr->singleton(), "must be a constant (cloned jsr body)");
1458
1459 // Effect on jsr on stack
1460 push(_gvn.makecon(ret_addr));
1461
1462 // Flow to the jsr.
1463 merge(jsr_bci);
1464 }
1465
1466 // Handle ret bytecode
1467 void Parse::do_ret() {
1468 // Find to whom we return.
1469 assert(block()->num_successors() == 1, "a ret can only go one place now");
1470 Block* target = block()->successor_at(0);
1471 assert(!target->is_ready(), "our arrival must be expected");
1472 profile_ret(target->flow()->start());
1473 int pnum = target->next_path_num();
1474 merge_common(target, pnum);
1475 }
1476
1477 static bool has_injected_profile(BoolTest::mask btest, Node* test, int& taken, int& not_taken) {
1478 if (btest != BoolTest::eq && btest != BoolTest::ne) {
1479 // Only ::eq and ::ne are supported for profile injection.
1480 return false;
1481 }
1482 if (test->is_Cmp() &&
1483 test->in(1)->Opcode() == Op_ProfileBoolean) {
1484 ProfileBooleanNode* profile = (ProfileBooleanNode*)test->in(1);
1485 int false_cnt = profile->false_count();
1486 int true_cnt = profile->true_count();
1487
1488 // Counts matching depends on the actual test operation (::eq or ::ne).
1489 // No need to scale the counts because profile injection was designed
1490 // to feed exact counts into VM.
1491 taken = (btest == BoolTest::eq) ? false_cnt : true_cnt;
1492 not_taken = (btest == BoolTest::eq) ? true_cnt : false_cnt;
1493
1494 profile->consume();
1495 return true;
1496 }
1497 return false;
1498 }
1499 //--------------------------dynamic_branch_prediction--------------------------
1500 // Try to gather dynamic branch prediction behavior. Return a probability
1501 // of the branch being taken and set the "cnt" field. Returns a -1.0
1502 // if we need to use static prediction for some reason.
1503 float Parse::dynamic_branch_prediction(float &cnt, BoolTest::mask btest, Node* test) {
1504 ResourceMark rm;
1505
1506 cnt = COUNT_UNKNOWN;
1507
1508 int taken = 0;
1509 int not_taken = 0;
1510
1511 bool use_mdo = !has_injected_profile(btest, test, taken, not_taken);
1512
1513 if (use_mdo) {
1514 // Use MethodData information if it is available
1515 // FIXME: free the ProfileData structure
1516 ciMethodData* methodData = method()->method_data();
1517 if (!methodData->is_mature()) return PROB_UNKNOWN;
1518 ciProfileData* data = methodData->bci_to_data(bci());
1519 if (data == NULL) {
1520 return PROB_UNKNOWN;
1521 }
1522 if (!data->is_JumpData()) return PROB_UNKNOWN;
1523
1524 // get taken and not taken values
1525 taken = data->as_JumpData()->taken();
1526 not_taken = 0;
1527 if (data->is_BranchData()) {
1528 not_taken = data->as_BranchData()->not_taken();
1529 }
1530
1531 // scale the counts to be commensurate with invocation counts:
1532 taken = method()->scale_count(taken);
1533 not_taken = method()->scale_count(not_taken);
1534 }
1535
1536 // Give up if too few (or too many, in which case the sum will overflow) counts to be meaningful.
1537 // We also check that individual counters are positive first, otherwise the sum can become positive.
1538 if (taken < 0 || not_taken < 0 || taken + not_taken < 40) {
1539 if (C->log() != NULL) {
1540 C->log()->elem("branch target_bci='%d' taken='%d' not_taken='%d'", iter().get_dest(), taken, not_taken);
1541 }
1542 return PROB_UNKNOWN;
1543 }
1544
1545 // Compute frequency that we arrive here
1546 float sum = taken + not_taken;
1547 // Adjust, if this block is a cloned private block but the
1548 // Jump counts are shared. Taken the private counts for
1549 // just this path instead of the shared counts.
1550 if( block()->count() > 0 )
1551 sum = block()->count();
1552 cnt = sum / FreqCountInvocations;
1553
1554 // Pin probability to sane limits
1555 float prob;
1556 if( !taken )
1557 prob = (0+PROB_MIN) / 2;
1558 else if( !not_taken )
1559 prob = (1+PROB_MAX) / 2;
1560 else { // Compute probability of true path
1561 prob = (float)taken / (float)(taken + not_taken);
1562 if (prob > PROB_MAX) prob = PROB_MAX;
1563 if (prob < PROB_MIN) prob = PROB_MIN;
1564 }
1565
1566 assert((cnt > 0.0f) && (prob > 0.0f),
1567 "Bad frequency assignment in if");
1568
1569 if (C->log() != NULL) {
1570 const char* prob_str = NULL;
1571 if (prob >= PROB_MAX) prob_str = (prob == PROB_MAX) ? "max" : "always";
1572 if (prob <= PROB_MIN) prob_str = (prob == PROB_MIN) ? "min" : "never";
1573 char prob_str_buf[30];
1574 if (prob_str == NULL) {
1575 jio_snprintf(prob_str_buf, sizeof(prob_str_buf), "%20.2f", prob);
1576 prob_str = prob_str_buf;
1577 }
1578 C->log()->elem("branch target_bci='%d' taken='%d' not_taken='%d' cnt='%f' prob='%s'",
1579 iter().get_dest(), taken, not_taken, cnt, prob_str);
1580 }
1581 return prob;
1582 }
1583
1584 //-----------------------------branch_prediction-------------------------------
1585 float Parse::branch_prediction(float& cnt,
1586 BoolTest::mask btest,
1587 int target_bci,
1588 Node* test) {
1589 float prob = dynamic_branch_prediction(cnt, btest, test);
1590 // If prob is unknown, switch to static prediction
1591 if (prob != PROB_UNKNOWN) return prob;
1592
1593 prob = PROB_FAIR; // Set default value
1594 if (btest == BoolTest::eq) // Exactly equal test?
1595 prob = PROB_STATIC_INFREQUENT; // Assume its relatively infrequent
1596 else if (btest == BoolTest::ne)
1597 prob = PROB_STATIC_FREQUENT; // Assume its relatively frequent
1598
1599 // If this is a conditional test guarding a backwards branch,
1600 // assume its a loop-back edge. Make it a likely taken branch.
1601 if (target_bci < bci()) {
1602 if (is_osr_parse()) { // Could be a hot OSR'd loop; force deopt
1603 // Since it's an OSR, we probably have profile data, but since
1604 // branch_prediction returned PROB_UNKNOWN, the counts are too small.
1605 // Let's make a special check here for completely zero counts.
1606 ciMethodData* methodData = method()->method_data();
1607 if (!methodData->is_empty()) {
1608 ciProfileData* data = methodData->bci_to_data(bci());
1609 // Only stop for truly zero counts, which mean an unknown part
1610 // of the OSR-ed method, and we want to deopt to gather more stats.
1611 // If you have ANY counts, then this loop is simply 'cold' relative
1612 // to the OSR loop.
1613 if (data == NULL ||
1614 (data->as_BranchData()->taken() + data->as_BranchData()->not_taken() == 0)) {
1615 // This is the only way to return PROB_UNKNOWN:
1616 return PROB_UNKNOWN;
1617 }
1618 }
1619 }
1620 prob = PROB_STATIC_FREQUENT; // Likely to take backwards branch
1621 }
1622
1623 assert(prob != PROB_UNKNOWN, "must have some guess at this point");
1624 return prob;
1625 }
1626
1627 // The magic constants are chosen so as to match the output of
1628 // branch_prediction() when the profile reports a zero taken count.
1629 // It is important to distinguish zero counts unambiguously, because
1630 // some branches (e.g., _213_javac.Assembler.eliminate) validly produce
1631 // very small but nonzero probabilities, which if confused with zero
1632 // counts would keep the program recompiling indefinitely.
1633 bool Parse::seems_never_taken(float prob) const {
1634 return prob < PROB_MIN;
1635 }
1636
1637 // True if the comparison seems to be the kind that will not change its
1638 // statistics from true to false. See comments in adjust_map_after_if.
1639 // This question is only asked along paths which are already
1640 // classifed as untaken (by seems_never_taken), so really,
1641 // if a path is never taken, its controlling comparison is
1642 // already acting in a stable fashion. If the comparison
1643 // seems stable, we will put an expensive uncommon trap
1644 // on the untaken path.
1645 bool Parse::seems_stable_comparison() const {
1646 if (C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if)) {
1647 return false;
1648 }
1649 return true;
1650 }
1651
1652 //-------------------------------repush_if_args--------------------------------
1653 // Push arguments of an "if" bytecode back onto the stack by adjusting _sp.
1654 inline int Parse::repush_if_args() {
1655 if (PrintOpto && WizardMode) {
1656 tty->print("defending against excessive implicit null exceptions on %s @%d in ",
1657 Bytecodes::name(iter().cur_bc()), iter().cur_bci());
1658 method()->print_name(); tty->cr();
1659 }
1660 int bc_depth = - Bytecodes::depth(iter().cur_bc());
1661 assert(bc_depth == 1 || bc_depth == 2, "only two kinds of branches");
1662 DEBUG_ONLY(sync_jvms()); // argument(n) requires a synced jvms
1663 assert(argument(0) != NULL, "must exist");
1664 assert(bc_depth == 1 || argument(1) != NULL, "two must exist");
1665 inc_sp(bc_depth);
1666 return bc_depth;
1667 }
1668
1669 //----------------------------------do_ifnull----------------------------------
1670 void Parse::do_ifnull(BoolTest::mask btest, Node *c) {
1671 int target_bci = iter().get_dest();
1672
1673 Block* branch_block = successor_for_bci(target_bci);
1674 Block* next_block = successor_for_bci(iter().next_bci());
1675
1676 float cnt;
1677 float prob = branch_prediction(cnt, btest, target_bci, c);
1678 if (prob == PROB_UNKNOWN) {
1679 // (An earlier version of do_ifnull omitted this trap for OSR methods.)
1680 if (PrintOpto && Verbose) {
1681 tty->print_cr("Never-taken edge stops compilation at bci %d", bci());
1682 }
1683 repush_if_args(); // to gather stats on loop
1684 // We need to mark this branch as taken so that if we recompile we will
1685 // see that it is possible. In the tiered system the interpreter doesn't
1686 // do profiling and by the time we get to the lower tier from the interpreter
1687 // the path may be cold again. Make sure it doesn't look untaken
1688 profile_taken_branch(target_bci, !ProfileInterpreter);
1689 uncommon_trap(Deoptimization::Reason_unreached,
1690 Deoptimization::Action_reinterpret,
1691 NULL, "cold");
1692 if (C->eliminate_boxing()) {
1693 // Mark the successor blocks as parsed
1694 branch_block->next_path_num();
1695 next_block->next_path_num();
1696 }
1697 return;
1698 }
1699
1700 NOT_PRODUCT(explicit_null_checks_inserted++);
1701
1702 // Generate real control flow
1703 Node *tst = _gvn.transform( new BoolNode( c, btest ) );
1704
1705 // Sanity check the probability value
1706 assert(prob > 0.0f,"Bad probability in Parser");
1707 // Need xform to put node in hash table
1708 IfNode *iff = create_and_xform_if( control(), tst, prob, cnt );
1709 assert(iff->_prob > 0.0f,"Optimizer made bad probability in parser");
1710 // True branch
1711 { PreserveJVMState pjvms(this);
1712 Node* iftrue = _gvn.transform( new IfTrueNode (iff) );
1713 set_control(iftrue);
1714
1715 if (stopped()) { // Path is dead?
1716 NOT_PRODUCT(explicit_null_checks_elided++);
1717 if (C->eliminate_boxing()) {
1718 // Mark the successor block as parsed
1719 branch_block->next_path_num();
1720 }
1721 } else { // Path is live.
1722 // Update method data
1723 profile_taken_branch(target_bci);
1724 adjust_map_after_if(btest, c, prob, branch_block);
1725 if (!stopped()) {
1726 merge(target_bci);
1727 }
1728 }
1729 }
1730
1731 // False branch
1732 Node* iffalse = _gvn.transform( new IfFalseNode(iff) );
1733 set_control(iffalse);
1734
1735 if (stopped()) { // Path is dead?
1736 NOT_PRODUCT(explicit_null_checks_elided++);
1737 if (C->eliminate_boxing()) {
1738 // Mark the successor block as parsed
1739 next_block->next_path_num();
1740 }
1741 } else { // Path is live.
1742 // Update method data
1743 profile_not_taken_branch();
1744 adjust_map_after_if(BoolTest(btest).negate(), c, 1.0-prob, next_block);
1745 }
1746 }
1747
1748 //------------------------------------do_if------------------------------------
1749 void Parse::do_if(BoolTest::mask btest, Node* c, bool new_path, Node** ctrl_taken) {
1750 int target_bci = iter().get_dest();
1751
1752 Block* branch_block = successor_for_bci(target_bci);
1753 Block* next_block = successor_for_bci(iter().next_bci());
1754
1755 float cnt;
1756 float prob = branch_prediction(cnt, btest, target_bci, c);
1757 float untaken_prob = 1.0 - prob;
1758
1759 if (prob == PROB_UNKNOWN) {
1760 if (PrintOpto && Verbose) {
1761 tty->print_cr("Never-taken edge stops compilation at bci %d", bci());
1762 }
1763 repush_if_args(); // to gather stats on loop
1764 // We need to mark this branch as taken so that if we recompile we will
1765 // see that it is possible. In the tiered system the interpreter doesn't
1766 // do profiling and by the time we get to the lower tier from the interpreter
1767 // the path may be cold again. Make sure it doesn't look untaken
1768 profile_taken_branch(target_bci, !ProfileInterpreter);
1769 uncommon_trap(Deoptimization::Reason_unreached,
1770 Deoptimization::Action_reinterpret,
1771 NULL, "cold");
1772 if (C->eliminate_boxing()) {
1773 // Mark the successor blocks as parsed
1774 branch_block->next_path_num();
1775 next_block->next_path_num();
1776 }
1777 return;
1778 }
1779
1780 // Sanity check the probability value
1781 assert(0.0f < prob && prob < 1.0f,"Bad probability in Parser");
1782
1783 bool taken_if_true = true;
1784 // Convert BoolTest to canonical form:
1785 if (!BoolTest(btest).is_canonical()) {
1786 btest = BoolTest(btest).negate();
1787 taken_if_true = false;
1788 // prob is NOT updated here; it remains the probability of the taken
1789 // path (as opposed to the prob of the path guarded by an 'IfTrueNode').
1790 }
1791 assert(btest != BoolTest::eq, "!= is the only canonical exact test");
1792
1793 Node* tst0 = new BoolNode(c, btest);
1794 Node* tst = _gvn.transform(tst0);
1795 BoolTest::mask taken_btest = BoolTest::illegal;
1796 BoolTest::mask untaken_btest = BoolTest::illegal;
1797
1798 if (tst->is_Bool()) {
1799 // Refresh c from the transformed bool node, since it may be
1800 // simpler than the original c. Also re-canonicalize btest.
1801 // This wins when (Bool ne (Conv2B p) 0) => (Bool ne (CmpP p NULL)).
1802 // That can arise from statements like: if (x instanceof C) ...
1803 if (tst != tst0) {
1804 // Canonicalize one more time since transform can change it.
1805 btest = tst->as_Bool()->_test._test;
1806 if (!BoolTest(btest).is_canonical()) {
1807 // Reverse edges one more time...
1808 tst = _gvn.transform( tst->as_Bool()->negate(&_gvn) );
1809 btest = tst->as_Bool()->_test._test;
1810 assert(BoolTest(btest).is_canonical(), "sanity");
1811 taken_if_true = !taken_if_true;
1812 }
1813 c = tst->in(1);
1814 }
1815 BoolTest::mask neg_btest = BoolTest(btest).negate();
1816 taken_btest = taken_if_true ? btest : neg_btest;
1817 untaken_btest = taken_if_true ? neg_btest : btest;
1818 }
1819
1820 // Generate real control flow
1821 float true_prob = (taken_if_true ? prob : untaken_prob);
1822 IfNode* iff = create_and_map_if(control(), tst, true_prob, cnt);
1823 assert(iff->_prob > 0.0f,"Optimizer made bad probability in parser");
1824 Node* taken_branch = new IfTrueNode(iff);
1825 Node* untaken_branch = new IfFalseNode(iff);
1826 if (!taken_if_true) { // Finish conversion to canonical form
1827 Node* tmp = taken_branch;
1828 taken_branch = untaken_branch;
1829 untaken_branch = tmp;
1830 }
1831
1832 // Branch is taken:
1833 { PreserveJVMState pjvms(this);
1834 taken_branch = _gvn.transform(taken_branch);
1835 set_control(taken_branch);
1836
1837 if (stopped()) {
1838 if (C->eliminate_boxing() && !new_path) {
1839 // Mark the successor block as parsed (if we haven't created a new path)
1840 branch_block->next_path_num();
1841 }
1842 } else {
1843 // Update method data
1844 profile_taken_branch(target_bci);
1845 adjust_map_after_if(taken_btest, c, prob, branch_block);
1846 if (!stopped()) {
1847 if (new_path) {
1848 // Merge by using a new path
1849 merge_new_path(target_bci);
1850 } else if (ctrl_taken != NULL) {
1851 // Don't merge but save taken branch to be wired by caller
1852 *ctrl_taken = control();
1853 } else {
1854 merge(target_bci);
1855 }
1856 }
1857 }
1858 }
1859
1860 untaken_branch = _gvn.transform(untaken_branch);
1861 set_control(untaken_branch);
1862
1863 // Branch not taken.
1864 if (stopped() && ctrl_taken == NULL) {
1865 if (C->eliminate_boxing()) {
1866 // Mark the successor block as parsed (if caller does not re-wire control flow)
1867 next_block->next_path_num();
1868 }
1869 } else {
1870 // Update method data
1871 profile_not_taken_branch();
1872 adjust_map_after_if(untaken_btest, c, untaken_prob, next_block);
1873 }
1874 }
1875
1876 void Parse::do_acmp(BoolTest::mask btest, Node* a, Node* b) {
1877 ciMethod* subst_method = ciEnv::current()->ValueBootstrapMethods_klass()->find_method(ciSymbol::isSubstitutable_name(), ciSymbol::object_object_boolean_signature());
1878 // If current method is ValueBootstrapMethods::isSubstitutable(),
1879 // compile the acmp as a regular pointer comparison otherwise we
1880 // could call ValueBootstrapMethods::isSubstitutable() back
1881 if (ACmpOnValues == 0 || method() == subst_method) {
1882 Node* cmp = CmpP(a, b);
1883 cmp = optimize_cmp_with_klass(cmp);
1884 do_if(btest, cmp);
1885 return;
1886 }
1887
1888 if (ACmpOnValues == 3) {
1889 // Substitutability test
1890 if (a->is_ValueType()) {
1891 inc_sp(2);
1892 a = a->as_ValueType()->allocate(this, true)->get_oop();
1893 dec_sp(2);
1894 }
1895 if (b->is_ValueType()) {
1896 inc_sp(2);
1897 b = b->as_ValueType()->allocate(this, true)->get_oop();
1898 dec_sp(2);
1899 }
1900
1901 const TypeOopPtr* ta = _gvn.type(a)->isa_oopptr();
1902 const TypeOopPtr* tb = _gvn.type(b)->isa_oopptr();
1903
1904 if (ta == NULL || !ta->can_be_value_type_raw() ||
1905 tb == NULL || !tb->can_be_value_type_raw()) {
1906 Node* cmp = CmpP(a, b);
1907 cmp = optimize_cmp_with_klass(cmp);
1908 do_if(btest, cmp);
1909 return;
1910 }
1911
1912 Node* cmp = CmpP(a, b);
1913 cmp = optimize_cmp_with_klass(cmp);
1914 Node* eq_region = NULL;
1915 if (btest == BoolTest::eq) {
1916 do_if(btest, cmp, true);
1917 if (stopped()) {
1918 return;
1919 }
1920 } else {
1921 assert(btest == BoolTest::ne, "only eq or ne");
1922 Node* is_not_equal = NULL;
1923 eq_region = new RegionNode(3);
1924 {
1925 PreserveJVMState pjvms(this);
1926 do_if(btest, cmp, false, &is_not_equal);
1927 if (!stopped()) {
1928 eq_region->init_req(1, control());
1929 }
1930 }
1931 if (is_not_equal == NULL || is_not_equal->is_top()) {
1932 record_for_igvn(eq_region);
1933 set_control(_gvn.transform(eq_region));
1934 return;
1935 }
1936 set_control(is_not_equal);
1937 }
1938 // Pointers not equal, check for values
1939 Node* ne_region = new RegionNode(6);
1940 inc_sp(2);
1941 Node* null_ctl = top();
1942 Node* not_null_a = null_check_oop(a, &null_ctl, !too_many_traps(Deoptimization::Reason_null_check), false, false);
1943 dec_sp(2);
1944 ne_region->init_req(1, null_ctl);
1945 if (stopped()) {
1946 record_for_igvn(ne_region);
1947 set_control(_gvn.transform(ne_region));
1948 if (btest == BoolTest::ne) {
1949 {
1950 PreserveJVMState pjvms(this);
1951 int target_bci = iter().get_dest();
1952 merge(target_bci);
1953 }
1954 record_for_igvn(eq_region);
1955 set_control(_gvn.transform(eq_region));
1956 }
1957 return;
1958 }
1959
1960 Node* is_value = is_always_locked(not_null_a);
1961 Node* value_mask = _gvn.MakeConX(markOopDesc::always_locked_pattern);
1962 Node* is_value_cmp = _gvn.transform(new CmpXNode(is_value, value_mask));
1963 Node* is_value_bol = _gvn.transform(new BoolNode(is_value_cmp, BoolTest::ne));
1964 IfNode* is_value_iff = create_and_map_if(control(), is_value_bol, PROB_FAIR, COUNT_UNKNOWN);
1965 Node* not_value = _gvn.transform(new IfTrueNode(is_value_iff));
1966 set_control(_gvn.transform(new IfFalseNode(is_value_iff)));
1967 ne_region->init_req(2, not_value);
1968
1969 // One of the 2 pointers refers to a value, check if both are of
1970 // the same class
1971 inc_sp(2);
1972 null_ctl = top();
1973 Node* not_null_b = null_check_oop(b, &null_ctl, !too_many_traps(Deoptimization::Reason_null_check), false, false);
1974 dec_sp(2);
1975 ne_region->init_req(3, null_ctl);
1976 if (stopped()) {
1977 record_for_igvn(ne_region);
1978 set_control(_gvn.transform(ne_region));
1979 if (btest == BoolTest::ne) {
1980 {
1981 PreserveJVMState pjvms(this);
1982 int target_bci = iter().get_dest();
1983 merge(target_bci);
1984 }
1985 record_for_igvn(eq_region);
1986 set_control(_gvn.transform(eq_region));
1987 }
1988 return;
1989 }
1990 Node* kls_a = load_object_klass(not_null_a);
1991 Node* kls_b = load_object_klass(not_null_b);
1992 Node* kls_cmp = CmpP(kls_a, kls_b);
1993 Node* kls_bol = _gvn.transform(new BoolNode(kls_cmp, BoolTest::ne));
1994 IfNode* kls_iff = create_and_map_if(control(), kls_bol, PROB_FAIR, COUNT_UNKNOWN);
1995 Node* kls_ne = _gvn.transform(new IfTrueNode(kls_iff));
1996 set_control(_gvn.transform(new IfFalseNode(kls_iff)));
1997 ne_region->init_req(4, kls_ne);
1998
1999 if (stopped()) {
2000 record_for_igvn(ne_region);
2001 set_control(_gvn.transform(ne_region));
2002 if (btest == BoolTest::ne) {
2003 {
2004 PreserveJVMState pjvms(this);
2005 int target_bci = iter().get_dest();
2006 merge(target_bci);
2007 }
2008 record_for_igvn(eq_region);
2009 set_control(_gvn.transform(eq_region));
2010 }
2011 return;
2012 }
2013 // Both are values of the same class, we need to perform a
2014 // substitutability test. Delegate to
2015 // ValueBootstrapMethods::isSubstitutable().
2016
2017 Node* ne_io_phi = PhiNode::make(ne_region, i_o());
2018 Node* mem = reset_memory();
2019 Node* ne_mem_phi = PhiNode::make(ne_region, mem);
2020
2021 Node* eq_io_phi = NULL;
2022 Node* eq_mem_phi = NULL;
2023 if (eq_region != NULL) {
2024 eq_io_phi = PhiNode::make(eq_region, i_o());
2025 eq_mem_phi = PhiNode::make(eq_region, mem);
2026 }
2027
2028 set_all_memory(mem);
2029
2030 kill_dead_locals();
2031 CallStaticJavaNode *call = new CallStaticJavaNode(C, TypeFunc::make(subst_method), SharedRuntime::get_resolve_static_call_stub(), subst_method, bci());
2032 call->set_override_symbolic_info(true);
2033 call->init_req(TypeFunc::Parms, not_null_a);
2034 call->init_req(TypeFunc::Parms+1, not_null_b);
2035 inc_sp(2);
2036 set_edges_for_java_call(call, false, false);
2037 Node* ret = set_results_for_java_call(call, false, true);
2038 dec_sp(2);
2039
2040 // Test the return value of ValueBootstrapMethods::isSubstitutable()
2041 Node* subst_cmp = _gvn.transform(new CmpINode(ret, intcon(1)));
2042 Node* ctl = C->top();
2043 if (btest == BoolTest::eq) {
2044 PreserveJVMState pjvms(this);
2045 do_if(btest, subst_cmp);
2046 if (!stopped()) {
2047 ctl = control();
2048 }
2049 } else {
2050 assert(btest == BoolTest::ne, "only eq or ne");
2051 PreserveJVMState pjvms(this);
2052 do_if(btest, subst_cmp, false, &ctl);
2053 if (!stopped()) {
2054 eq_region->init_req(2, control());
2055 eq_io_phi->init_req(2, i_o());
2056 eq_mem_phi->init_req(2, reset_memory());
2057 }
2058 }
2059 ne_region->init_req(5, ctl);
2060 ne_io_phi->init_req(5, i_o());
2061 ne_mem_phi->init_req(5, reset_memory());
2062
2063 record_for_igvn(ne_region);
2064 set_control(_gvn.transform(ne_region));
2065 set_i_o(_gvn.transform(ne_io_phi));
2066 set_all_memory(_gvn.transform(ne_mem_phi));
2067
2068 if (btest == BoolTest::ne) {
2069 {
2070 PreserveJVMState pjvms(this);
2071 int target_bci = iter().get_dest();
2072 merge(target_bci);
2073 }
2074
2075 record_for_igvn(eq_region);
2076 set_control(_gvn.transform(eq_region));
2077 set_i_o(_gvn.transform(eq_io_phi));
2078 set_all_memory(_gvn.transform(eq_mem_phi));
2079 }
2080
2081 return;
2082 }
2083 // In the case were both operands might be value types, we need to
2084 // use the new acmp implementation. Otherwise, i.e. if one operand
2085 // is not a value type, we can use the old acmp implementation.
2086 Node* cmp = C->optimize_acmp(&_gvn, a, b);
2087 if (cmp != NULL) {
2088 // Use optimized/old acmp
2089 cmp = optimize_cmp_with_klass(_gvn.transform(cmp));
2090 do_if(btest, cmp);
2091 return;
2092 }
2093
2094 Node* ctrl = NULL;
2095 bool safe_for_replace = true;
2096 if (ACmpOnValues != 1) {
2097 // Emit old acmp before new acmp for quick a != b check
2098 cmp = CmpP(a, b);
2099 cmp = optimize_cmp_with_klass(_gvn.transform(cmp));
2100 if (btest == BoolTest::ne) {
2101 do_if(btest, cmp, true);
2102 if (stopped()) {
2103 return; // Never equal
2104 }
2105 } else if (btest == BoolTest::eq) {
2106 Node* is_equal = NULL;
2107 {
2108 PreserveJVMState pjvms(this);
2109 do_if(btest, cmp, false, &is_equal);
2110 if (!stopped()) {
2111 // Not equal, skip valuetype check
2112 ctrl = new RegionNode(3);
2113 ctrl->init_req(1, control());
2114 _gvn.set_type(ctrl, Type::CONTROL);
2115 record_for_igvn(ctrl);
2116 safe_for_replace = false;
2117 }
2118 }
2119 if (is_equal == NULL) {
2120 assert(ctrl != NULL, "no control left");
2121 set_control(_gvn.transform(ctrl));
2122 return; // Never equal
2123 }
2124 set_control(is_equal);
2125 }
2126 }
2127
2128 // Null check operand before loading the is_value bit
2129 bool speculate = false;
2130 if (!TypePtr::NULL_PTR->higher_equal(_gvn.type(b))) {
2131 // Operand 'b' is never null, swap operands to avoid null check
2132 swap(a, b);
2133 } else if (!too_many_traps(Deoptimization::Reason_speculate_null_check)) {
2134 // Speculate on non-nullness of one operand
2135 if (!_gvn.type(a)->speculative_maybe_null()) {
2136 speculate = true;
2137 } else if (!_gvn.type(b)->speculative_maybe_null()) {
2138 speculate = true;
2139 swap(a, b);
2140 }
2141 }
2142 inc_sp(2);
2143 Node* null_ctl = top();
2144 Node* not_null_a = null_check_oop(a, &null_ctl, speculate, safe_for_replace, speculate);
2145 assert(!stopped(), "operand is always null");
2146 dec_sp(2);
2147 Node* region = new RegionNode(2);
2148 Node* is_value = new PhiNode(region, TypeX_X);
2149 if (null_ctl != top()) {
2150 assert(!speculate, "should never be null");
2151 region->add_req(null_ctl);
2152 is_value->add_req(_gvn.MakeConX(0));
2153 }
2154
2155 Node* value_mask = _gvn.MakeConX(markOopDesc::always_locked_pattern);
2156 if (ACmpOnValues == 1) {
2157 Node* mark_addr = basic_plus_adr(not_null_a, oopDesc::mark_offset_in_bytes());
2158 Node* mark = make_load(NULL, mark_addr, TypeX_X, TypeX_X->basic_type(), MemNode::unordered);
2159 Node* not_mark = _gvn.transform(new XorXNode(mark, _gvn.MakeConX(-1)));
2160 Node* andn = _gvn.transform(new AndXNode(not_mark, value_mask));
2161 Node* neg_if_value = _gvn.transform(new SubXNode(andn, _gvn.MakeConX(1)));
2162 is_value->init_req(1, _gvn.transform(new RShiftXNode(neg_if_value, _gvn.intcon(63))));
2163 } else {
2164 is_value->init_req(1, is_always_locked(not_null_a));
2165 }
2166 region->init_req(1, control());
2167
2168 set_control(_gvn.transform(region));
2169 is_value = _gvn.transform(is_value);
2170
2171 if (ACmpOnValues == 1) {
2172 // Perturbe oop if operand is a value type to make comparison fail
2173 Node* pert = _gvn.transform(new AddPNode(a, a, is_value));
2174 cmp = _gvn.transform(new CmpPNode(pert, b));
2175 } else {
2176 // Check for a value type because we already know that operands are equal
2177 cmp = _gvn.transform(new CmpXNode(is_value, value_mask));
2178 btest = (btest == BoolTest::eq) ? BoolTest::ne : BoolTest::eq;
2179 }
2180 cmp = optimize_cmp_with_klass(cmp);
2181 do_if(btest, cmp);
2182
2183 if (ctrl != NULL) {
2184 ctrl->init_req(2, control());
2185 set_control(_gvn.transform(ctrl));
2186 }
2187 }
2188
2189 bool Parse::path_is_suitable_for_uncommon_trap(float prob) const {
2190 // Don't want to speculate on uncommon traps when running with -Xcomp
2191 if (!UseInterpreter) {
2192 return false;
2193 }
2194 return (seems_never_taken(prob) && seems_stable_comparison());
2195 }
2196
2197 void Parse::maybe_add_predicate_after_if(Block* path) {
2198 if (path->is_SEL_head() && path->preds_parsed() == 0) {
2199 // Add predicates at bci of if dominating the loop so traps can be
2200 // recorded on the if's profile data
2201 int bc_depth = repush_if_args();
2202 add_predicate();
2203 dec_sp(bc_depth);
2204 path->set_has_predicates();
2205 }
2206 }
2207
2208
2209 //----------------------------adjust_map_after_if------------------------------
2210 // Adjust the JVM state to reflect the result of taking this path.
2211 // Basically, it means inspecting the CmpNode controlling this
2212 // branch, seeing how it constrains a tested value, and then
2213 // deciding if it's worth our while to encode this constraint
2214 // as graph nodes in the current abstract interpretation map.
2215 void Parse::adjust_map_after_if(BoolTest::mask btest, Node* c, float prob, Block* path) {
2216 if (!c->is_Cmp()) {
2217 maybe_add_predicate_after_if(path);
2218 return;
2219 }
2220
2221 if (stopped() || btest == BoolTest::illegal) {
2222 return; // nothing to do
2223 }
2224
2225 bool is_fallthrough = (path == successor_for_bci(iter().next_bci()));
2226
2227 if (path_is_suitable_for_uncommon_trap(prob)) {
2228 repush_if_args();
2229 uncommon_trap(Deoptimization::Reason_unstable_if,
2230 Deoptimization::Action_reinterpret,
2231 NULL,
2232 (is_fallthrough ? "taken always" : "taken never"));
2233 return;
2234 }
2235
2236 Node* val = c->in(1);
2237 Node* con = c->in(2);
2238 const Type* tcon = _gvn.type(con);
2239 const Type* tval = _gvn.type(val);
2240 bool have_con = tcon->singleton();
2241 if (tval->singleton()) {
2242 if (!have_con) {
2243 // Swap, so constant is in con.
2244 con = val;
2245 tcon = tval;
2246 val = c->in(2);
2247 tval = _gvn.type(val);
2248 btest = BoolTest(btest).commute();
2249 have_con = true;
2250 } else {
2251 // Do we have two constants? Then leave well enough alone.
2252 have_con = false;
2253 }
2254 }
2255 if (!have_con) { // remaining adjustments need a con
2256 maybe_add_predicate_after_if(path);
2257 return;
2258 }
2259
2260 sharpen_type_after_if(btest, con, tcon, val, tval);
2261 maybe_add_predicate_after_if(path);
2262 }
2263
2264
2265 static Node* extract_obj_from_klass_load(PhaseGVN* gvn, Node* n) {
2266 Node* ldk;
2267 if (n->is_DecodeNKlass()) {
2268 if (n->in(1)->Opcode() != Op_LoadNKlass) {
2269 return NULL;
2270 } else {
2271 ldk = n->in(1);
2272 }
2273 } else if (n->Opcode() != Op_LoadKlass) {
2274 return NULL;
2275 } else {
2276 ldk = n;
2277 }
2278 assert(ldk != NULL && ldk->is_Load(), "should have found a LoadKlass or LoadNKlass node");
2279
2280 Node* adr = ldk->in(MemNode::Address);
2281 intptr_t off = 0;
2282 Node* obj = AddPNode::Ideal_base_and_offset(adr, gvn, off);
2283 if (obj == NULL || off != oopDesc::klass_offset_in_bytes()) // loading oopDesc::_klass?
2284 return NULL;
2285 const TypePtr* tp = gvn->type(obj)->is_ptr();
2286 if (tp == NULL || !(tp->isa_instptr() || tp->isa_aryptr())) // is obj a Java object ptr?
2287 return NULL;
2288
2289 return obj;
2290 }
2291
2292 void Parse::sharpen_type_after_if(BoolTest::mask btest,
2293 Node* con, const Type* tcon,
2294 Node* val, const Type* tval) {
2295 // Look for opportunities to sharpen the type of a node
2296 // whose klass is compared with a constant klass.
2297 if (btest == BoolTest::eq && tcon->isa_klassptr()) {
2298 Node* obj = extract_obj_from_klass_load(&_gvn, val);
2299 const TypeOopPtr* con_type = tcon->isa_klassptr()->as_instance_type();
2300 if (obj != NULL && (con_type->isa_instptr() || con_type->isa_aryptr())) {
2301 // Found:
2302 // Bool(CmpP(LoadKlass(obj._klass), ConP(Foo.klass)), [eq])
2303 // or the narrowOop equivalent.
2304 const Type* obj_type = _gvn.type(obj);
2305 const TypeOopPtr* tboth = obj_type->join_speculative(con_type)->isa_oopptr();
2306 if (tboth != NULL && tboth->klass_is_exact() && tboth != obj_type &&
2307 tboth->higher_equal(obj_type)) {
2308 // obj has to be of the exact type Foo if the CmpP succeeds.
2309 int obj_in_map = map()->find_edge(obj);
2310 JVMState* jvms = this->jvms();
2311 if (obj_in_map >= 0 &&
2312 (jvms->is_loc(obj_in_map) || jvms->is_stk(obj_in_map))) {
2313 TypeNode* ccast = new CheckCastPPNode(control(), obj, tboth);
2314 const Type* tcc = ccast->as_Type()->type();
2315 assert(tcc != obj_type && tcc->higher_equal(obj_type), "must improve");
2316 // Delay transform() call to allow recovery of pre-cast value
2317 // at the control merge.
2318 _gvn.set_type_bottom(ccast);
2319 record_for_igvn(ccast);
2320 // Here's the payoff.
2321 replace_in_map(obj, ccast);
2322 }
2323 }
2324 }
2325 }
2326
2327 int val_in_map = map()->find_edge(val);
2328 if (val_in_map < 0) return; // replace_in_map would be useless
2329 {
2330 JVMState* jvms = this->jvms();
2331 if (!(jvms->is_loc(val_in_map) ||
2332 jvms->is_stk(val_in_map)))
2333 return; // again, it would be useless
2334 }
2335
2336 // Check for a comparison to a constant, and "know" that the compared
2337 // value is constrained on this path.
2338 assert(tcon->singleton(), "");
2339 ConstraintCastNode* ccast = NULL;
2340 Node* cast = NULL;
2341
2342 switch (btest) {
2343 case BoolTest::eq: // Constant test?
2344 {
2345 const Type* tboth = tcon->join_speculative(tval);
2346 if (tboth == tval) break; // Nothing to gain.
2347 if (tcon->isa_int()) {
2348 ccast = new CastIINode(val, tboth);
2349 } else if (tcon == TypePtr::NULL_PTR) {
2350 // Cast to null, but keep the pointer identity temporarily live.
2351 ccast = new CastPPNode(val, tboth);
2352 } else {
2353 const TypeF* tf = tcon->isa_float_constant();
2354 const TypeD* td = tcon->isa_double_constant();
2355 // Exclude tests vs float/double 0 as these could be
2356 // either +0 or -0. Just because you are equal to +0
2357 // doesn't mean you ARE +0!
2358 // Note, following code also replaces Long and Oop values.
2359 if ((!tf || tf->_f != 0.0) &&
2360 (!td || td->_d != 0.0))
2361 cast = con; // Replace non-constant val by con.
2362 }
2363 }
2364 break;
2365
2366 case BoolTest::ne:
2367 if (tcon == TypePtr::NULL_PTR) {
2368 cast = cast_not_null(val, false);
2369 }
2370 break;
2371
2372 default:
2373 // (At this point we could record int range types with CastII.)
2374 break;
2375 }
2376
2377 if (ccast != NULL) {
2378 const Type* tcc = ccast->as_Type()->type();
2379 assert(tcc != tval && tcc->higher_equal(tval), "must improve");
2380 // Delay transform() call to allow recovery of pre-cast value
2381 // at the control merge.
2382 ccast->set_req(0, control());
2383 _gvn.set_type_bottom(ccast);
2384 record_for_igvn(ccast);
2385 cast = ccast;
2386 }
2387
2388 if (cast != NULL) { // Here's the payoff.
2389 replace_in_map(val, cast);
2390 }
2391 }
2392
2393 /**
2394 * Use speculative type to optimize CmpP node: if comparison is
2395 * against the low level class, cast the object to the speculative
2396 * type if any. CmpP should then go away.
2397 *
2398 * @param c expected CmpP node
2399 * @return result of CmpP on object casted to speculative type
2400 *
2401 */
2402 Node* Parse::optimize_cmp_with_klass(Node* c) {
2403 // If this is transformed by the _gvn to a comparison with the low
2404 // level klass then we may be able to use speculation
2405 if (c->Opcode() == Op_CmpP &&
2406 (c->in(1)->Opcode() == Op_LoadKlass || c->in(1)->Opcode() == Op_DecodeNKlass) &&
2407 c->in(2)->is_Con()) {
2408 Node* load_klass = NULL;
2409 Node* decode = NULL;
2410 if (c->in(1)->Opcode() == Op_DecodeNKlass) {
2411 decode = c->in(1);
2412 load_klass = c->in(1)->in(1);
2413 } else {
2414 load_klass = c->in(1);
2415 }
2416 if (load_klass->in(2)->is_AddP()) {
2417 Node* addp = load_klass->in(2);
2418 Node* obj = addp->in(AddPNode::Address);
2419 const TypeOopPtr* obj_type = _gvn.type(obj)->is_oopptr();
2420 if (obj_type->speculative_type_not_null() != NULL) {
2421 ciKlass* k = obj_type->speculative_type();
2422 inc_sp(2);
2423 obj = maybe_cast_profiled_obj(obj, k);
2424 dec_sp(2);
2425 if (obj->is_ValueType()) {
2426 assert(obj->as_ValueType()->is_allocated(&_gvn), "must be allocated");
2427 obj = obj->as_ValueType()->get_oop();
2428 }
2429 // Make the CmpP use the casted obj
2430 addp = basic_plus_adr(obj, addp->in(AddPNode::Offset));
2431 load_klass = load_klass->clone();
2432 load_klass->set_req(2, addp);
2433 load_klass = _gvn.transform(load_klass);
2434 if (decode != NULL) {
2435 decode = decode->clone();
2436 decode->set_req(1, load_klass);
2437 load_klass = _gvn.transform(decode);
2438 }
2439 c = c->clone();
2440 c->set_req(1, load_klass);
2441 c = _gvn.transform(c);
2442 }
2443 }
2444 }
2445 return c;
2446 }
2447
2448 //------------------------------do_one_bytecode--------------------------------
2449 // Parse this bytecode, and alter the Parsers JVM->Node mapping
2450 void Parse::do_one_bytecode() {
2451 Node *a, *b, *c, *d; // Handy temps
2452 BoolTest::mask btest;
2453 int i;
2454
2455 assert(!has_exceptions(), "bytecode entry state must be clear of throws");
2456
2457 if (C->check_node_count(NodeLimitFudgeFactor * 5,
2458 "out of nodes parsing method")) {
2459 return;
2460 }
2461
2462 #ifdef ASSERT
2463 // for setting breakpoints
2464 if (TraceOptoParse) {
2465 tty->print(" @");
2466 dump_bci(bci());
2467 tty->cr();
2468 }
2469 #endif
2470
2471 switch (bc()) {
2472 case Bytecodes::_nop:
2473 // do nothing
2474 break;
2475 case Bytecodes::_lconst_0:
2476 push_pair(longcon(0));
2477 break;
2478
2479 case Bytecodes::_lconst_1:
2480 push_pair(longcon(1));
2481 break;
2482
2483 case Bytecodes::_fconst_0:
2484 push(zerocon(T_FLOAT));
2485 break;
2486
2487 case Bytecodes::_fconst_1:
2488 push(makecon(TypeF::ONE));
2489 break;
2490
2491 case Bytecodes::_fconst_2:
2492 push(makecon(TypeF::make(2.0f)));
2493 break;
2494
2495 case Bytecodes::_dconst_0:
2496 push_pair(zerocon(T_DOUBLE));
2497 break;
2498
2499 case Bytecodes::_dconst_1:
2500 push_pair(makecon(TypeD::ONE));
2501 break;
2502
2503 case Bytecodes::_iconst_m1:push(intcon(-1)); break;
2504 case Bytecodes::_iconst_0: push(intcon( 0)); break;
2505 case Bytecodes::_iconst_1: push(intcon( 1)); break;
2506 case Bytecodes::_iconst_2: push(intcon( 2)); break;
2507 case Bytecodes::_iconst_3: push(intcon( 3)); break;
2508 case Bytecodes::_iconst_4: push(intcon( 4)); break;
2509 case Bytecodes::_iconst_5: push(intcon( 5)); break;
2510 case Bytecodes::_bipush: push(intcon(iter().get_constant_u1())); break;
2511 case Bytecodes::_sipush: push(intcon(iter().get_constant_u2())); break;
2512 case Bytecodes::_aconst_null: push(null()); break;
2513 case Bytecodes::_ldc:
2514 case Bytecodes::_ldc_w:
2515 case Bytecodes::_ldc2_w:
2516 // If the constant is unresolved, run this BC once in the interpreter.
2517 {
2518 ciConstant constant = iter().get_constant();
2519 if (!constant.is_valid() ||
2520 (constant.basic_type() == T_OBJECT &&
2521 !constant.as_object()->is_loaded())) {
2522 int index = iter().get_constant_pool_index();
2523 constantTag tag = iter().get_constant_pool_tag(index);
2524 uncommon_trap(Deoptimization::make_trap_request
2525 (Deoptimization::Reason_unloaded,
2526 Deoptimization::Action_reinterpret,
2527 index),
2528 NULL, tag.internal_name());
2529 break;
2530 }
2531 assert(constant.basic_type() != T_OBJECT || constant.as_object()->is_instance(),
2532 "must be java_mirror of klass");
2533 const Type* con_type = Type::make_from_constant(constant);
2534 if (con_type != NULL) {
2535 push_node(con_type->basic_type(), makecon(con_type));
2536 }
2537 }
2538
2539 break;
2540
2541 case Bytecodes::_aload_0:
2542 push( local(0) );
2543 break;
2544 case Bytecodes::_aload_1:
2545 push( local(1) );
2546 break;
2547 case Bytecodes::_aload_2:
2548 push( local(2) );
2549 break;
2550 case Bytecodes::_aload_3:
2551 push( local(3) );
2552 break;
2553 case Bytecodes::_aload:
2554 push( local(iter().get_index()) );
2555 break;
2556
2557 case Bytecodes::_fload_0:
2558 case Bytecodes::_iload_0:
2559 push( local(0) );
2560 break;
2561 case Bytecodes::_fload_1:
2562 case Bytecodes::_iload_1:
2563 push( local(1) );
2564 break;
2565 case Bytecodes::_fload_2:
2566 case Bytecodes::_iload_2:
2567 push( local(2) );
2568 break;
2569 case Bytecodes::_fload_3:
2570 case Bytecodes::_iload_3:
2571 push( local(3) );
2572 break;
2573 case Bytecodes::_fload:
2574 case Bytecodes::_iload:
2575 push( local(iter().get_index()) );
2576 break;
2577 case Bytecodes::_lload_0:
2578 push_pair_local( 0 );
2579 break;
2580 case Bytecodes::_lload_1:
2581 push_pair_local( 1 );
2582 break;
2583 case Bytecodes::_lload_2:
2584 push_pair_local( 2 );
2585 break;
2586 case Bytecodes::_lload_3:
2587 push_pair_local( 3 );
2588 break;
2589 case Bytecodes::_lload:
2590 push_pair_local( iter().get_index() );
2591 break;
2592
2593 case Bytecodes::_dload_0:
2594 push_pair_local(0);
2595 break;
2596 case Bytecodes::_dload_1:
2597 push_pair_local(1);
2598 break;
2599 case Bytecodes::_dload_2:
2600 push_pair_local(2);
2601 break;
2602 case Bytecodes::_dload_3:
2603 push_pair_local(3);
2604 break;
2605 case Bytecodes::_dload:
2606 push_pair_local(iter().get_index());
2607 break;
2608 case Bytecodes::_fstore_0:
2609 case Bytecodes::_istore_0:
2610 case Bytecodes::_astore_0:
2611 set_local( 0, pop() );
2612 break;
2613 case Bytecodes::_fstore_1:
2614 case Bytecodes::_istore_1:
2615 case Bytecodes::_astore_1:
2616 set_local( 1, pop() );
2617 break;
2618 case Bytecodes::_fstore_2:
2619 case Bytecodes::_istore_2:
2620 case Bytecodes::_astore_2:
2621 set_local( 2, pop() );
2622 break;
2623 case Bytecodes::_fstore_3:
2624 case Bytecodes::_istore_3:
2625 case Bytecodes::_astore_3:
2626 set_local( 3, pop() );
2627 break;
2628 case Bytecodes::_fstore:
2629 case Bytecodes::_istore:
2630 case Bytecodes::_astore:
2631 set_local( iter().get_index(), pop() );
2632 break;
2633 // long stores
2634 case Bytecodes::_lstore_0:
2635 set_pair_local( 0, pop_pair() );
2636 break;
2637 case Bytecodes::_lstore_1:
2638 set_pair_local( 1, pop_pair() );
2639 break;
2640 case Bytecodes::_lstore_2:
2641 set_pair_local( 2, pop_pair() );
2642 break;
2643 case Bytecodes::_lstore_3:
2644 set_pair_local( 3, pop_pair() );
2645 break;
2646 case Bytecodes::_lstore:
2647 set_pair_local( iter().get_index(), pop_pair() );
2648 break;
2649
2650 // double stores
2651 case Bytecodes::_dstore_0:
2652 set_pair_local( 0, dstore_rounding(pop_pair()) );
2653 break;
2654 case Bytecodes::_dstore_1:
2655 set_pair_local( 1, dstore_rounding(pop_pair()) );
2656 break;
2657 case Bytecodes::_dstore_2:
2658 set_pair_local( 2, dstore_rounding(pop_pair()) );
2659 break;
2660 case Bytecodes::_dstore_3:
2661 set_pair_local( 3, dstore_rounding(pop_pair()) );
2662 break;
2663 case Bytecodes::_dstore:
2664 set_pair_local( iter().get_index(), dstore_rounding(pop_pair()) );
2665 break;
2666
2667 case Bytecodes::_pop: dec_sp(1); break;
2668 case Bytecodes::_pop2: dec_sp(2); break;
2669 case Bytecodes::_swap:
2670 a = pop();
2671 b = pop();
2672 push(a);
2673 push(b);
2674 break;
2675 case Bytecodes::_dup:
2676 a = pop();
2677 push(a);
2678 push(a);
2679 break;
2680 case Bytecodes::_dup_x1:
2681 a = pop();
2682 b = pop();
2683 push( a );
2684 push( b );
2685 push( a );
2686 break;
2687 case Bytecodes::_dup_x2:
2688 a = pop();
2689 b = pop();
2690 c = pop();
2691 push( a );
2692 push( c );
2693 push( b );
2694 push( a );
2695 break;
2696 case Bytecodes::_dup2:
2697 a = pop();
2698 b = pop();
2699 push( b );
2700 push( a );
2701 push( b );
2702 push( a );
2703 break;
2704
2705 case Bytecodes::_dup2_x1:
2706 // before: .. c, b, a
2707 // after: .. b, a, c, b, a
2708 // not tested
2709 a = pop();
2710 b = pop();
2711 c = pop();
2712 push( b );
2713 push( a );
2714 push( c );
2715 push( b );
2716 push( a );
2717 break;
2718 case Bytecodes::_dup2_x2:
2719 // before: .. d, c, b, a
2720 // after: .. b, a, d, c, b, a
2721 // not tested
2722 a = pop();
2723 b = pop();
2724 c = pop();
2725 d = pop();
2726 push( b );
2727 push( a );
2728 push( d );
2729 push( c );
2730 push( b );
2731 push( a );
2732 break;
2733
2734 case Bytecodes::_arraylength: {
2735 // Must do null-check with value on expression stack
2736 Node *ary = null_check(peek(), T_ARRAY);
2737 // Compile-time detect of null-exception?
2738 if (stopped()) return;
2739 a = pop();
2740 push(load_array_length(a));
2741 break;
2742 }
2743
2744 case Bytecodes::_baload: array_load(T_BYTE); break;
2745 case Bytecodes::_caload: array_load(T_CHAR); break;
2746 case Bytecodes::_iaload: array_load(T_INT); break;
2747 case Bytecodes::_saload: array_load(T_SHORT); break;
2748 case Bytecodes::_faload: array_load(T_FLOAT); break;
2749 case Bytecodes::_aaload: array_load(T_OBJECT); break;
2750 case Bytecodes::_laload: array_load(T_LONG); break;
2751 case Bytecodes::_daload: array_load(T_DOUBLE); break;
2752 case Bytecodes::_bastore: array_store(T_BYTE); break;
2753 case Bytecodes::_castore: array_store(T_CHAR); break;
2754 case Bytecodes::_iastore: array_store(T_INT); break;
2755 case Bytecodes::_sastore: array_store(T_SHORT); break;
2756 case Bytecodes::_fastore: array_store(T_FLOAT); break;
2757 case Bytecodes::_aastore: array_store(T_OBJECT); break;
2758 case Bytecodes::_lastore: array_store(T_LONG); break;
2759 case Bytecodes::_dastore: array_store(T_DOUBLE); break;
2760
2761 case Bytecodes::_getfield:
2762 do_getfield();
2763 break;
2764
2765 case Bytecodes::_getstatic:
2766 do_getstatic();
2767 break;
2768
2769 case Bytecodes::_putfield:
2770 do_putfield();
2771 break;
2772
2773 case Bytecodes::_putstatic:
2774 do_putstatic();
2775 break;
2776
2777 case Bytecodes::_irem:
2778 do_irem();
2779 break;
2780 case Bytecodes::_idiv:
2781 // Must keep both values on the expression-stack during null-check
2782 zero_check_int(peek());
2783 // Compile-time detect of null-exception?
2784 if (stopped()) return;
2785 b = pop();
2786 a = pop();
2787 push( _gvn.transform( new DivINode(control(),a,b) ) );
2788 break;
2789 case Bytecodes::_imul:
2790 b = pop(); a = pop();
2791 push( _gvn.transform( new MulINode(a,b) ) );
2792 break;
2793 case Bytecodes::_iadd:
2794 b = pop(); a = pop();
2795 push( _gvn.transform( new AddINode(a,b) ) );
2796 break;
2797 case Bytecodes::_ineg:
2798 a = pop();
2799 push( _gvn.transform( new SubINode(_gvn.intcon(0),a)) );
2800 break;
2801 case Bytecodes::_isub:
2802 b = pop(); a = pop();
2803 push( _gvn.transform( new SubINode(a,b) ) );
2804 break;
2805 case Bytecodes::_iand:
2806 b = pop(); a = pop();
2807 push( _gvn.transform( new AndINode(a,b) ) );
2808 break;
2809 case Bytecodes::_ior:
2810 b = pop(); a = pop();
2811 push( _gvn.transform( new OrINode(a,b) ) );
2812 break;
2813 case Bytecodes::_ixor:
2814 b = pop(); a = pop();
2815 push( _gvn.transform( new XorINode(a,b) ) );
2816 break;
2817 case Bytecodes::_ishl:
2818 b = pop(); a = pop();
2819 push( _gvn.transform( new LShiftINode(a,b) ) );
2820 break;
2821 case Bytecodes::_ishr:
2822 b = pop(); a = pop();
2823 push( _gvn.transform( new RShiftINode(a,b) ) );
2824 break;
2825 case Bytecodes::_iushr:
2826 b = pop(); a = pop();
2827 push( _gvn.transform( new URShiftINode(a,b) ) );
2828 break;
2829
2830 case Bytecodes::_fneg:
2831 a = pop();
2832 b = _gvn.transform(new NegFNode (a));
2833 push(b);
2834 break;
2835
2836 case Bytecodes::_fsub:
2837 b = pop();
2838 a = pop();
2839 c = _gvn.transform( new SubFNode(a,b) );
2840 d = precision_rounding(c);
2841 push( d );
2842 break;
2843
2844 case Bytecodes::_fadd:
2845 b = pop();
2846 a = pop();
2847 c = _gvn.transform( new AddFNode(a,b) );
2848 d = precision_rounding(c);
2849 push( d );
2850 break;
2851
2852 case Bytecodes::_fmul:
2853 b = pop();
2854 a = pop();
2855 c = _gvn.transform( new MulFNode(a,b) );
2856 d = precision_rounding(c);
2857 push( d );
2858 break;
2859
2860 case Bytecodes::_fdiv:
2861 b = pop();
2862 a = pop();
2863 c = _gvn.transform( new DivFNode(0,a,b) );
2864 d = precision_rounding(c);
2865 push( d );
2866 break;
2867
2868 case Bytecodes::_frem:
2869 if (Matcher::has_match_rule(Op_ModF)) {
2870 // Generate a ModF node.
2871 b = pop();
2872 a = pop();
2873 c = _gvn.transform( new ModFNode(0,a,b) );
2874 d = precision_rounding(c);
2875 push( d );
2876 }
2877 else {
2878 // Generate a call.
2879 modf();
2880 }
2881 break;
2882
2883 case Bytecodes::_fcmpl:
2884 b = pop();
2885 a = pop();
2886 c = _gvn.transform( new CmpF3Node( a, b));
2887 push(c);
2888 break;
2889 case Bytecodes::_fcmpg:
2890 b = pop();
2891 a = pop();
2892
2893 // Same as fcmpl but need to flip the unordered case. Swap the inputs,
2894 // which negates the result sign except for unordered. Flip the unordered
2895 // as well by using CmpF3 which implements unordered-lesser instead of
2896 // unordered-greater semantics. Finally, commute the result bits. Result
2897 // is same as using a CmpF3Greater except we did it with CmpF3 alone.
2898 c = _gvn.transform( new CmpF3Node( b, a));
2899 c = _gvn.transform( new SubINode(_gvn.intcon(0),c) );
2900 push(c);
2901 break;
2902
2903 case Bytecodes::_f2i:
2904 a = pop();
2905 push(_gvn.transform(new ConvF2INode(a)));
2906 break;
2907
2908 case Bytecodes::_d2i:
2909 a = pop_pair();
2910 b = _gvn.transform(new ConvD2INode(a));
2911 push( b );
2912 break;
2913
2914 case Bytecodes::_f2d:
2915 a = pop();
2916 b = _gvn.transform( new ConvF2DNode(a));
2917 push_pair( b );
2918 break;
2919
2920 case Bytecodes::_d2f:
2921 a = pop_pair();
2922 b = _gvn.transform( new ConvD2FNode(a));
2923 // This breaks _227_mtrt (speed & correctness) and _222_mpegaudio (speed)
2924 //b = _gvn.transform(new RoundFloatNode(0, b) );
2925 push( b );
2926 break;
2927
2928 case Bytecodes::_l2f:
2929 if (Matcher::convL2FSupported()) {
2930 a = pop_pair();
2931 b = _gvn.transform( new ConvL2FNode(a));
2932 // For i486.ad, FILD doesn't restrict precision to 24 or 53 bits.
2933 // Rather than storing the result into an FP register then pushing
2934 // out to memory to round, the machine instruction that implements
2935 // ConvL2D is responsible for rounding.
2936 // c = precision_rounding(b);
2937 c = _gvn.transform(b);
2938 push(c);
2939 } else {
2940 l2f();
2941 }
2942 break;
2943
2944 case Bytecodes::_l2d:
2945 a = pop_pair();
2946 b = _gvn.transform( new ConvL2DNode(a));
2947 // For i486.ad, rounding is always necessary (see _l2f above).
2948 // c = dprecision_rounding(b);
2949 c = _gvn.transform(b);
2950 push_pair(c);
2951 break;
2952
2953 case Bytecodes::_f2l:
2954 a = pop();
2955 b = _gvn.transform( new ConvF2LNode(a));
2956 push_pair(b);
2957 break;
2958
2959 case Bytecodes::_d2l:
2960 a = pop_pair();
2961 b = _gvn.transform( new ConvD2LNode(a));
2962 push_pair(b);
2963 break;
2964
2965 case Bytecodes::_dsub:
2966 b = pop_pair();
2967 a = pop_pair();
2968 c = _gvn.transform( new SubDNode(a,b) );
2969 d = dprecision_rounding(c);
2970 push_pair( d );
2971 break;
2972
2973 case Bytecodes::_dadd:
2974 b = pop_pair();
2975 a = pop_pair();
2976 c = _gvn.transform( new AddDNode(a,b) );
2977 d = dprecision_rounding(c);
2978 push_pair( d );
2979 break;
2980
2981 case Bytecodes::_dmul:
2982 b = pop_pair();
2983 a = pop_pair();
2984 c = _gvn.transform( new MulDNode(a,b) );
2985 d = dprecision_rounding(c);
2986 push_pair( d );
2987 break;
2988
2989 case Bytecodes::_ddiv:
2990 b = pop_pair();
2991 a = pop_pair();
2992 c = _gvn.transform( new DivDNode(0,a,b) );
2993 d = dprecision_rounding(c);
2994 push_pair( d );
2995 break;
2996
2997 case Bytecodes::_dneg:
2998 a = pop_pair();
2999 b = _gvn.transform(new NegDNode (a));
3000 push_pair(b);
3001 break;
3002
3003 case Bytecodes::_drem:
3004 if (Matcher::has_match_rule(Op_ModD)) {
3005 // Generate a ModD node.
3006 b = pop_pair();
3007 a = pop_pair();
3008 // a % b
3009
3010 c = _gvn.transform( new ModDNode(0,a,b) );
3011 d = dprecision_rounding(c);
3012 push_pair( d );
3013 }
3014 else {
3015 // Generate a call.
3016 modd();
3017 }
3018 break;
3019
3020 case Bytecodes::_dcmpl:
3021 b = pop_pair();
3022 a = pop_pair();
3023 c = _gvn.transform( new CmpD3Node( a, b));
3024 push(c);
3025 break;
3026
3027 case Bytecodes::_dcmpg:
3028 b = pop_pair();
3029 a = pop_pair();
3030 // Same as dcmpl but need to flip the unordered case.
3031 // Commute the inputs, which negates the result sign except for unordered.
3032 // Flip the unordered as well by using CmpD3 which implements
3033 // unordered-lesser instead of unordered-greater semantics.
3034 // Finally, negate the result bits. Result is same as using a
3035 // CmpD3Greater except we did it with CmpD3 alone.
3036 c = _gvn.transform( new CmpD3Node( b, a));
3037 c = _gvn.transform( new SubINode(_gvn.intcon(0),c) );
3038 push(c);
3039 break;
3040
3041
3042 // Note for longs -> lo word is on TOS, hi word is on TOS - 1
3043 case Bytecodes::_land:
3044 b = pop_pair();
3045 a = pop_pair();
3046 c = _gvn.transform( new AndLNode(a,b) );
3047 push_pair(c);
3048 break;
3049 case Bytecodes::_lor:
3050 b = pop_pair();
3051 a = pop_pair();
3052 c = _gvn.transform( new OrLNode(a,b) );
3053 push_pair(c);
3054 break;
3055 case Bytecodes::_lxor:
3056 b = pop_pair();
3057 a = pop_pair();
3058 c = _gvn.transform( new XorLNode(a,b) );
3059 push_pair(c);
3060 break;
3061
3062 case Bytecodes::_lshl:
3063 b = pop(); // the shift count
3064 a = pop_pair(); // value to be shifted
3065 c = _gvn.transform( new LShiftLNode(a,b) );
3066 push_pair(c);
3067 break;
3068 case Bytecodes::_lshr:
3069 b = pop(); // the shift count
3070 a = pop_pair(); // value to be shifted
3071 c = _gvn.transform( new RShiftLNode(a,b) );
3072 push_pair(c);
3073 break;
3074 case Bytecodes::_lushr:
3075 b = pop(); // the shift count
3076 a = pop_pair(); // value to be shifted
3077 c = _gvn.transform( new URShiftLNode(a,b) );
3078 push_pair(c);
3079 break;
3080 case Bytecodes::_lmul:
3081 b = pop_pair();
3082 a = pop_pair();
3083 c = _gvn.transform( new MulLNode(a,b) );
3084 push_pair(c);
3085 break;
3086
3087 case Bytecodes::_lrem:
3088 // Must keep both values on the expression-stack during null-check
3089 assert(peek(0) == top(), "long word order");
3090 zero_check_long(peek(1));
3091 // Compile-time detect of null-exception?
3092 if (stopped()) return;
3093 b = pop_pair();
3094 a = pop_pair();
3095 c = _gvn.transform( new ModLNode(control(),a,b) );
3096 push_pair(c);
3097 break;
3098
3099 case Bytecodes::_ldiv:
3100 // Must keep both values on the expression-stack during null-check
3101 assert(peek(0) == top(), "long word order");
3102 zero_check_long(peek(1));
3103 // Compile-time detect of null-exception?
3104 if (stopped()) return;
3105 b = pop_pair();
3106 a = pop_pair();
3107 c = _gvn.transform( new DivLNode(control(),a,b) );
3108 push_pair(c);
3109 break;
3110
3111 case Bytecodes::_ladd:
3112 b = pop_pair();
3113 a = pop_pair();
3114 c = _gvn.transform( new AddLNode(a,b) );
3115 push_pair(c);
3116 break;
3117 case Bytecodes::_lsub:
3118 b = pop_pair();
3119 a = pop_pair();
3120 c = _gvn.transform( new SubLNode(a,b) );
3121 push_pair(c);
3122 break;
3123 case Bytecodes::_lcmp:
3124 // Safepoints are now inserted _before_ branches. The long-compare
3125 // bytecode painfully produces a 3-way value (-1,0,+1) which requires a
3126 // slew of control flow. These are usually followed by a CmpI vs zero and
3127 // a branch; this pattern then optimizes to the obvious long-compare and
3128 // branch. However, if the branch is backwards there's a Safepoint
3129 // inserted. The inserted Safepoint captures the JVM state at the
3130 // pre-branch point, i.e. it captures the 3-way value. Thus if a
3131 // long-compare is used to control a loop the debug info will force
3132 // computation of the 3-way value, even though the generated code uses a
3133 // long-compare and branch. We try to rectify the situation by inserting
3134 // a SafePoint here and have it dominate and kill the safepoint added at a
3135 // following backwards branch. At this point the JVM state merely holds 2
3136 // longs but not the 3-way value.
3137 if( UseLoopSafepoints ) {
3138 switch( iter().next_bc() ) {
3139 case Bytecodes::_ifgt:
3140 case Bytecodes::_iflt:
3141 case Bytecodes::_ifge:
3142 case Bytecodes::_ifle:
3143 case Bytecodes::_ifne:
3144 case Bytecodes::_ifeq:
3145 // If this is a backwards branch in the bytecodes, add Safepoint
3146 maybe_add_safepoint(iter().next_get_dest());
3147 default:
3148 break;
3149 }
3150 }
3151 b = pop_pair();
3152 a = pop_pair();
3153 c = _gvn.transform( new CmpL3Node( a, b ));
3154 push(c);
3155 break;
3156
3157 case Bytecodes::_lneg:
3158 a = pop_pair();
3159 b = _gvn.transform( new SubLNode(longcon(0),a));
3160 push_pair(b);
3161 break;
3162 case Bytecodes::_l2i:
3163 a = pop_pair();
3164 push( _gvn.transform( new ConvL2INode(a)));
3165 break;
3166 case Bytecodes::_i2l:
3167 a = pop();
3168 b = _gvn.transform( new ConvI2LNode(a));
3169 push_pair(b);
3170 break;
3171 case Bytecodes::_i2b:
3172 // Sign extend
3173 a = pop();
3174 a = _gvn.transform( new LShiftINode(a,_gvn.intcon(24)) );
3175 a = _gvn.transform( new RShiftINode(a,_gvn.intcon(24)) );
3176 push( a );
3177 break;
3178 case Bytecodes::_i2s:
3179 a = pop();
3180 a = _gvn.transform( new LShiftINode(a,_gvn.intcon(16)) );
3181 a = _gvn.transform( new RShiftINode(a,_gvn.intcon(16)) );
3182 push( a );
3183 break;
3184 case Bytecodes::_i2c:
3185 a = pop();
3186 push( _gvn.transform( new AndINode(a,_gvn.intcon(0xFFFF)) ) );
3187 break;
3188
3189 case Bytecodes::_i2f:
3190 a = pop();
3191 b = _gvn.transform( new ConvI2FNode(a) ) ;
3192 c = precision_rounding(b);
3193 push (b);
3194 break;
3195
3196 case Bytecodes::_i2d:
3197 a = pop();
3198 b = _gvn.transform( new ConvI2DNode(a));
3199 push_pair(b);
3200 break;
3201
3202 case Bytecodes::_iinc: // Increment local
3203 i = iter().get_index(); // Get local index
3204 set_local( i, _gvn.transform( new AddINode( _gvn.intcon(iter().get_iinc_con()), local(i) ) ) );
3205 break;
3206
3207 // Exit points of synchronized methods must have an unlock node
3208 case Bytecodes::_return:
3209 return_current(NULL);
3210 break;
3211
3212 case Bytecodes::_ireturn:
3213 case Bytecodes::_areturn:
3214 case Bytecodes::_freturn:
3215 return_current(pop());
3216 break;
3217 case Bytecodes::_lreturn:
3218 return_current(pop_pair());
3219 break;
3220 case Bytecodes::_dreturn:
3221 return_current(pop_pair());
3222 break;
3223
3224 case Bytecodes::_athrow:
3225 // null exception oop throws NULL pointer exception
3226 null_check(peek());
3227 if (stopped()) return;
3228 // Hook the thrown exception directly to subsequent handlers.
3229 if (BailoutToInterpreterForThrows) {
3230 // Keep method interpreted from now on.
3231 uncommon_trap(Deoptimization::Reason_unhandled,
3232 Deoptimization::Action_make_not_compilable);
3233 return;
3234 }
3235 if (env()->jvmti_can_post_on_exceptions()) {
3236 // check if we must post exception events, take uncommon trap if so (with must_throw = false)
3237 uncommon_trap_if_should_post_on_exceptions(Deoptimization::Reason_unhandled, false);
3238 }
3239 // Here if either can_post_on_exceptions or should_post_on_exceptions is false
3240 add_exception_state(make_exception_state(peek()));
3241 break;
3242
3243 case Bytecodes::_goto: // fall through
3244 case Bytecodes::_goto_w: {
3245 int target_bci = (bc() == Bytecodes::_goto) ? iter().get_dest() : iter().get_far_dest();
3246
3247 // If this is a backwards branch in the bytecodes, add Safepoint
3248 maybe_add_safepoint(target_bci);
3249
3250 // Update method data
3251 profile_taken_branch(target_bci);
3252
3253 // Merge the current control into the target basic block
3254 merge(target_bci);
3255
3256 // See if we can get some profile data and hand it off to the next block
3257 Block *target_block = block()->successor_for_bci(target_bci);
3258 if (target_block->pred_count() != 1) break;
3259 ciMethodData* methodData = method()->method_data();
3260 if (!methodData->is_mature()) break;
3261 ciProfileData* data = methodData->bci_to_data(bci());
3262 assert(data != NULL && data->is_JumpData(), "need JumpData for taken branch");
3263 int taken = ((ciJumpData*)data)->taken();
3264 taken = method()->scale_count(taken);
3265 target_block->set_count(taken);
3266 break;
3267 }
3268
3269 case Bytecodes::_ifnull: btest = BoolTest::eq; goto handle_if_null;
3270 case Bytecodes::_ifnonnull: btest = BoolTest::ne; goto handle_if_null;
3271 handle_if_null:
3272 // If this is a backwards branch in the bytecodes, add Safepoint
3273 maybe_add_safepoint(iter().get_dest());
3274 a = null();
3275 b = pop();
3276 if (b->is_ValueType()) {
3277 // Return constant false because 'b' is always non-null
3278 c = _gvn.makecon(TypeInt::CC_GT);
3279 } else {
3280 if (!_gvn.type(b)->speculative_maybe_null() &&
3281 !too_many_traps(Deoptimization::Reason_speculate_null_check)) {
3282 inc_sp(1);
3283 Node* null_ctl = top();
3284 b = null_check_oop(b, &null_ctl, true, true, true);
3285 assert(null_ctl->is_top(), "no null control here");
3286 dec_sp(1);
3287 } else if (_gvn.type(b)->speculative_always_null() &&
3288 !too_many_traps(Deoptimization::Reason_speculate_null_assert)) {
3289 inc_sp(1);
3290 b = null_assert(b);
3291 dec_sp(1);
3292 }
3293 c = _gvn.transform( new CmpPNode(b, a) );
3294 }
3295 do_ifnull(btest, c);
3296 break;
3297
3298 case Bytecodes::_if_acmpeq: btest = BoolTest::eq; goto handle_if_acmp;
3299 case Bytecodes::_if_acmpne: btest = BoolTest::ne; goto handle_if_acmp;
3300 handle_if_acmp:
3301 // If this is a backwards branch in the bytecodes, add Safepoint
3302 maybe_add_safepoint(iter().get_dest());
3303 a = access_resolve(pop(), 0);
3304 b = access_resolve(pop(), 0);
3305 do_acmp(btest, a, b);
3306 break;
3307
3308 case Bytecodes::_ifeq: btest = BoolTest::eq; goto handle_ifxx;
3309 case Bytecodes::_ifne: btest = BoolTest::ne; goto handle_ifxx;
3310 case Bytecodes::_iflt: btest = BoolTest::lt; goto handle_ifxx;
3311 case Bytecodes::_ifle: btest = BoolTest::le; goto handle_ifxx;
3312 case Bytecodes::_ifgt: btest = BoolTest::gt; goto handle_ifxx;
3313 case Bytecodes::_ifge: btest = BoolTest::ge; goto handle_ifxx;
3314 handle_ifxx:
3315 // If this is a backwards branch in the bytecodes, add Safepoint
3316 maybe_add_safepoint(iter().get_dest());
3317 a = _gvn.intcon(0);
3318 b = pop();
3319 c = _gvn.transform( new CmpINode(b, a) );
3320 do_if(btest, c);
3321 break;
3322
3323 case Bytecodes::_if_icmpeq: btest = BoolTest::eq; goto handle_if_icmp;
3324 case Bytecodes::_if_icmpne: btest = BoolTest::ne; goto handle_if_icmp;
3325 case Bytecodes::_if_icmplt: btest = BoolTest::lt; goto handle_if_icmp;
3326 case Bytecodes::_if_icmple: btest = BoolTest::le; goto handle_if_icmp;
3327 case Bytecodes::_if_icmpgt: btest = BoolTest::gt; goto handle_if_icmp;
3328 case Bytecodes::_if_icmpge: btest = BoolTest::ge; goto handle_if_icmp;
3329 handle_if_icmp:
3330 // If this is a backwards branch in the bytecodes, add Safepoint
3331 maybe_add_safepoint(iter().get_dest());
3332 a = pop();
3333 b = pop();
3334 c = _gvn.transform( new CmpINode( b, a ) );
3335 do_if(btest, c);
3336 break;
3337
3338 case Bytecodes::_tableswitch:
3339 do_tableswitch();
3340 break;
3341
3342 case Bytecodes::_lookupswitch:
3343 do_lookupswitch();
3344 break;
3345
3346 case Bytecodes::_invokestatic:
3347 case Bytecodes::_invokedynamic:
3348 case Bytecodes::_invokespecial:
3349 case Bytecodes::_invokevirtual:
3350 case Bytecodes::_invokeinterface:
3351 do_call();
3352 break;
3353 case Bytecodes::_checkcast:
3354 do_checkcast();
3355 break;
3356 case Bytecodes::_instanceof:
3357 do_instanceof();
3358 break;
3359 case Bytecodes::_anewarray:
3360 do_newarray();
3361 break;
3362 case Bytecodes::_newarray:
3363 do_newarray((BasicType)iter().get_index());
3364 break;
3365 case Bytecodes::_multianewarray:
3366 do_multianewarray();
3367 break;
3368 case Bytecodes::_new:
3369 do_new();
3370 break;
3371 case Bytecodes::_defaultvalue:
3372 do_defaultvalue();
3373 break;
3374 case Bytecodes::_withfield:
3375 do_withfield();
3376 break;
3377
3378 case Bytecodes::_jsr:
3379 case Bytecodes::_jsr_w:
3380 do_jsr();
3381 break;
3382
3383 case Bytecodes::_ret:
3384 do_ret();
3385 break;
3386
3387
3388 case Bytecodes::_monitorenter:
3389 do_monitor_enter();
3390 break;
3391
3392 case Bytecodes::_monitorexit:
3393 do_monitor_exit();
3394 break;
3395
3396 case Bytecodes::_breakpoint:
3397 // Breakpoint set concurrently to compile
3398 // %%% use an uncommon trap?
3399 C->record_failure("breakpoint in method");
3400 return;
3401
3402 default:
3403 #ifndef PRODUCT
3404 map()->dump(99);
3405 #endif
3406 tty->print("\nUnhandled bytecode %s\n", Bytecodes::name(bc()) );
3407 ShouldNotReachHere();
3408 }
3409
3410 #ifndef PRODUCT
3411 IdealGraphPrinter *printer = C->printer();
3412 if (printer && printer->should_print(1)) {
3413 char buffer[256];
3414 jio_snprintf(buffer, sizeof(buffer), "Bytecode %d: %s", bci(), Bytecodes::name(bc()));
3415 bool old = printer->traverse_outs();
3416 printer->set_traverse_outs(true);
3417 printer->print_method(buffer, 4);
3418 printer->set_traverse_outs(old);
3419 }
3420 #endif
3421 }