1 /*
2 * Copyright (c) 1998, 2023, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/ciMethodData.hpp"
27 #include "ci/ciSymbols.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "compiler/compileLog.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "jvm_io.h"
32 #include "memory/resourceArea.hpp"
33 #include "memory/universe.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "opto/addnode.hpp"
36 #include "opto/castnode.hpp"
37 #include "opto/convertnode.hpp"
38 #include "opto/divnode.hpp"
39 #include "opto/idealGraphPrinter.hpp"
40 #include "opto/idealKit.hpp"
41 #include "opto/inlinetypenode.hpp"
42 #include "opto/matcher.hpp"
43 #include "opto/memnode.hpp"
44 #include "opto/mulnode.hpp"
45 #include "opto/opaquenode.hpp"
46 #include "opto/parse.hpp"
47 #include "opto/runtime.hpp"
48 #include "runtime/deoptimization.hpp"
49 #include "runtime/sharedRuntime.hpp"
50
51 #ifndef PRODUCT
52 extern uint explicit_null_checks_inserted,
53 explicit_null_checks_elided;
54 #endif
55
56 Node* Parse::record_profile_for_speculation_at_array_load(Node* ld) {
57 // Feed unused profile data to type speculation
58 if (UseTypeSpeculation && UseArrayLoadStoreProfile) {
59 ciKlass* array_type = nullptr;
60 ciKlass* element_type = nullptr;
61 ProfilePtrKind element_ptr = ProfileMaybeNull;
62 bool flat_array = true;
63 bool null_free_array = true;
64 method()->array_access_profiled_type(bci(), array_type, element_type, element_ptr, flat_array, null_free_array);
65 if (element_type != nullptr || element_ptr != ProfileMaybeNull) {
66 ld = record_profile_for_speculation(ld, element_type, element_ptr);
67 }
68 }
69 return ld;
70 }
71
72
73 //---------------------------------array_load----------------------------------
74 void Parse::array_load(BasicType bt) {
75 const Type* elemtype = Type::TOP;
76 Node* adr = array_addressing(bt, 0, elemtype);
77 if (stopped()) return; // guaranteed null or range check
78
79 Node* idx = pop();
80 Node* ary = pop();
81
82 // Handle inline type arrays
83 const TypeOopPtr* elemptr = elemtype->make_oopptr();
84 const TypeAryPtr* ary_t = _gvn.type(ary)->is_aryptr();
85 if (ary_t->is_flat()) {
86 // Load from flat inline type array
87 Node* vt = InlineTypeNode::make_from_flat(this, elemtype->inline_klass(), ary, adr);
88 push(vt);
89 return;
90 } else if (ary_t->is_null_free()) {
91 // Load from non-flat inline type array (elements can never be null)
92 bt = T_PRIMITIVE_OBJECT;
93 } else if (!ary_t->is_not_flat()) {
94 // Cannot statically determine if array is a flat array, emit runtime check
95 assert(UseFlatArray && is_reference_type(bt) && elemptr->can_be_inline_type() && !ary_t->klass_is_exact() && !ary_t->is_not_null_free() &&
96 (!elemptr->is_inlinetypeptr() || elemptr->inline_klass()->flat_array()), "array can't be flat");
97 IdealKit ideal(this);
98 IdealVariable res(ideal);
99 ideal.declarations_done();
100 ideal.if_then(flat_array_test(ary, /* flat = */ false)); {
101 // non-flat array
102 assert(ideal.ctrl()->in(0)->as_If()->is_flat_array_check(&_gvn), "Should be found");
103 sync_kit(ideal);
104 const TypeAryPtr* adr_type = TypeAryPtr::get_array_body_type(bt);
105 Node* ld = access_load_at(ary, adr, adr_type, elemptr, bt,
106 IN_HEAP | IS_ARRAY | C2_CONTROL_DEPENDENT_LOAD);
107 if (elemptr->is_inlinetypeptr()) {
108 assert(elemptr->maybe_null(), "null free array should be handled above");
109 ld = InlineTypeNode::make_from_oop(this, ld, elemptr->inline_klass(), false);
110 }
111 ideal.sync_kit(this);
112 ideal.set(res, ld);
113 } ideal.else_(); {
114 // flat array
115 sync_kit(ideal);
116 if (elemptr->is_inlinetypeptr()) {
117 // Element type is known, cast and load from flat representation
118 ciInlineKlass* vk = elemptr->inline_klass();
119 assert(vk->flat_array() && elemptr->maybe_null(), "never/always flat - should be optimized");
120 ciArrayKlass* array_klass = ciArrayKlass::make(vk, /* null_free */ true);
121 const TypeAryPtr* arytype = TypeOopPtr::make_from_klass(array_klass)->isa_aryptr();
122 Node* cast = _gvn.transform(new CheckCastPPNode(control(), ary, arytype));
123 Node* casted_adr = array_element_address(cast, idx, T_PRIMITIVE_OBJECT, ary_t->size(), control());
124 // Re-execute flat array load if buffering triggers deoptimization
125 PreserveReexecuteState preexecs(this);
126 jvms()->set_should_reexecute(true);
127 inc_sp(2);
128 Node* vt = InlineTypeNode::make_from_flat(this, vk, cast, casted_adr)->buffer(this, false);
129 ideal.set(res, vt);
130 ideal.sync_kit(this);
131 } else {
132 // Element type is unknown, emit runtime call
133
134 // Below membars keep this access to an unknown flat array correctly
135 // ordered with other unknown and known flat array accesses.
136 insert_mem_bar_volatile(Op_MemBarCPUOrder, C->get_alias_index(TypeAryPtr::INLINES));
137
138 Node* call = nullptr;
139 {
140 // Re-execute flat array load if runtime call triggers deoptimization
141 PreserveReexecuteState preexecs(this);
142 jvms()->set_bci(_bci);
143 jvms()->set_should_reexecute(true);
144 inc_sp(2);
145 kill_dead_locals();
146 call = make_runtime_call(RC_NO_LEAF | RC_NO_IO,
147 OptoRuntime::load_unknown_inline_type(),
148 OptoRuntime::load_unknown_inline_Java(),
149 nullptr, TypeRawPtr::BOTTOM,
150 ary, idx);
151 }
152 make_slow_call_ex(call, env()->Throwable_klass(), false);
153 Node* buffer = _gvn.transform(new ProjNode(call, TypeFunc::Parms));
154
155 insert_mem_bar_volatile(Op_MemBarCPUOrder, C->get_alias_index(TypeAryPtr::INLINES));
156
157 // Keep track of the information that the inline type is in flat arrays
158 const Type* unknown_value = elemptr->is_instptr()->cast_to_flat_array();
159 buffer = _gvn.transform(new CheckCastPPNode(control(), buffer, unknown_value));
160
161 ideal.sync_kit(this);
162 ideal.set(res, buffer);
163 }
164 } ideal.end_if();
165 sync_kit(ideal);
166 Node* ld = _gvn.transform(ideal.value(res));
167 ld = record_profile_for_speculation_at_array_load(ld);
168 push_node(bt, ld);
169 return;
170 }
171
172 if (elemtype == TypeInt::BOOL) {
173 bt = T_BOOLEAN;
174 }
175 const TypeAryPtr* adr_type = TypeAryPtr::get_array_body_type(bt);
176 Node* ld = access_load_at(ary, adr, adr_type, elemtype, bt,
177 IN_HEAP | IS_ARRAY | C2_CONTROL_DEPENDENT_LOAD);
178 ld = record_profile_for_speculation_at_array_load(ld);
179 // Loading an inline type from a non-flat array
180 if (elemptr != nullptr && elemptr->is_inlinetypeptr()) {
181 assert(!ary_t->is_null_free() || !elemptr->maybe_null(), "inline type array elements should never be null");
182 ld = InlineTypeNode::make_from_oop(this, ld, elemptr->inline_klass(), !elemptr->maybe_null());
183 }
184 push_node(bt, ld);
185 }
186
187
188 //--------------------------------array_store----------------------------------
189 void Parse::array_store(BasicType bt) {
190 const Type* elemtype = Type::TOP;
191 Node* adr = array_addressing(bt, type2size[bt], elemtype);
192 if (stopped()) return; // guaranteed null or range check
193 Node* cast_val = nullptr;
194 if (bt == T_OBJECT) {
195 cast_val = array_store_check(adr, elemtype);
196 if (stopped()) return;
197 }
198 Node* val = pop_node(bt); // Value to store
199 Node* idx = pop(); // Index in the array
200 Node* ary = pop(); // The array itself
201
202 const TypeAryPtr* ary_t = _gvn.type(ary)->is_aryptr();
203 const TypeAryPtr* adr_type = TypeAryPtr::get_array_body_type(bt);
204
205 if (elemtype == TypeInt::BOOL) {
206 bt = T_BOOLEAN;
207 } else if (bt == T_OBJECT) {
208 elemtype = elemtype->make_oopptr();
209 const Type* tval = _gvn.type(cast_val);
210 // Based on the value to be stored, try to determine if the array is not null-free and/or not flat.
211 // This is only legal for non-null stores because the array_store_check always passes for null, even
212 // if the array is null-free. Null stores are handled in GraphKit::gen_inline_array_null_guard().
213 bool not_null_free = !tval->maybe_null() && !tval->is_oopptr()->can_be_inline_type();
214 bool not_flat = not_null_free || (tval->is_inlinetypeptr() && !tval->inline_klass()->flat_array());
215 if (!ary_t->is_not_null_free() && not_null_free) {
216 // Storing a non-inline type, mark array as not null-free (-> not flat).
217 ary_t = ary_t->cast_to_not_null_free();
218 Node* cast = _gvn.transform(new CheckCastPPNode(control(), ary, ary_t));
219 replace_in_map(ary, cast);
220 ary = cast;
221 } else if (!ary_t->is_not_flat() && not_flat) {
222 // Storing to a non-flat array, mark array as not flat.
223 ary_t = ary_t->cast_to_not_flat();
224 Node* cast = _gvn.transform(new CheckCastPPNode(control(), ary, ary_t));
225 replace_in_map(ary, cast);
226 ary = cast;
227 }
228
229 if (ary_t->is_flat()) {
230 // Store to flat inline type array
231 assert(!tval->maybe_null(), "should be guaranteed by array store check");
232 // Re-execute flat array store if buffering triggers deoptimization
233 PreserveReexecuteState preexecs(this);
234 inc_sp(3);
235 jvms()->set_should_reexecute(true);
236 cast_val->as_InlineType()->store_flat(this, ary, adr, nullptr, 0, MO_UNORDERED | IN_HEAP | IS_ARRAY);
237 return;
238 } else if (ary_t->is_null_free()) {
239 // Store to non-flat inline type array (elements can never be null)
240 assert(!tval->maybe_null(), "should be guaranteed by array store check");
241 if (elemtype->inline_klass()->is_empty()) {
242 // Ignore empty inline stores, array is already initialized.
243 return;
244 }
245 } else if (!ary_t->is_not_flat() && (tval != TypePtr::NULL_PTR || StressReflectiveCode)) {
246 // Array might be a flat array, emit runtime checks (for nullptr, a simple inline_array_null_guard is sufficient).
247 assert(UseFlatArray && !not_flat && elemtype->is_oopptr()->can_be_inline_type() &&
248 !ary_t->klass_is_exact() && !ary_t->is_not_null_free(), "array can't be a flat array");
249 IdealKit ideal(this);
250 ideal.if_then(flat_array_test(ary, /* flat = */ false)); {
251 // non-flat array
252 assert(ideal.ctrl()->in(0)->as_If()->is_flat_array_check(&_gvn), "Should be found");
253 sync_kit(ideal);
254 Node* cast_ary = inline_array_null_guard(ary, cast_val, 3);
255 inc_sp(3);
256 access_store_at(cast_ary, adr, adr_type, cast_val, elemtype, bt, MO_UNORDERED | IN_HEAP | IS_ARRAY, false);
257 dec_sp(3);
258 ideal.sync_kit(this);
259 } ideal.else_(); {
260 sync_kit(ideal);
261 // flat array
262 Node* null_ctl = top();
263 Node* val = null_check_oop(cast_val, &null_ctl);
264 if (null_ctl != top()) {
265 PreserveJVMState pjvms(this);
266 inc_sp(3);
267 set_control(null_ctl);
268 uncommon_trap(Deoptimization::Reason_null_check, Deoptimization::Action_none);
269 dec_sp(3);
270 }
271 // Try to determine the inline klass
272 ciInlineKlass* vk = nullptr;
273 if (tval->is_inlinetypeptr()) {
274 vk = tval->inline_klass();
275 } else if (elemtype->is_inlinetypeptr()) {
276 vk = elemtype->inline_klass();
277 }
278 Node* casted_ary = ary;
279 if (vk != nullptr && !stopped()) {
280 // Element type is known, cast and store to flat representation
281 assert(vk->flat_array() && elemtype->maybe_null(), "never/always flat - should be optimized");
282 ciArrayKlass* array_klass = ciArrayKlass::make(vk, /* null_free */ true);
283 const TypeAryPtr* arytype = TypeOopPtr::make_from_klass(array_klass)->isa_aryptr();
284 casted_ary = _gvn.transform(new CheckCastPPNode(control(), casted_ary, arytype));
285 Node* casted_adr = array_element_address(casted_ary, idx, T_OBJECT, arytype->size(), control());
286 if (!val->is_InlineType()) {
287 assert(!gvn().type(val)->maybe_null(), "inline type array elements should never be null");
288 val = InlineTypeNode::make_from_oop(this, val, vk);
289 }
290 // Re-execute flat array store if buffering triggers deoptimization
291 PreserveReexecuteState preexecs(this);
292 inc_sp(3);
293 jvms()->set_should_reexecute(true);
294 val->as_InlineType()->store_flat(this, casted_ary, casted_adr, nullptr, 0, MO_UNORDERED | IN_HEAP | IS_ARRAY);
295 } else if (!stopped()) {
296 // Element type is unknown, emit runtime call
297
298 // Below membars keep this access to an unknown flat array correctly
299 // ordered with other unknown and known flat array accesses.
300 insert_mem_bar_volatile(Op_MemBarCPUOrder, C->get_alias_index(TypeAryPtr::INLINES));
301
302 make_runtime_call(RC_LEAF,
303 OptoRuntime::store_unknown_inline_type(),
304 CAST_FROM_FN_PTR(address, OptoRuntime::store_unknown_inline),
305 "store_unknown_inline", TypeRawPtr::BOTTOM,
306 val, casted_ary, idx);
307
308 insert_mem_bar_volatile(Op_MemBarCPUOrder, C->get_alias_index(TypeAryPtr::INLINES));
309 }
310 ideal.sync_kit(this);
311 }
312 ideal.end_if();
313 sync_kit(ideal);
314 return;
315 } else if (!ary_t->is_not_null_free()) {
316 // Array is not flat but may be null free
317 assert(elemtype->is_oopptr()->can_be_inline_type() && !ary_t->klass_is_exact(), "array can't be null-free");
318 ary = inline_array_null_guard(ary, cast_val, 3, true);
319 }
320 }
321 inc_sp(3);
322 access_store_at(ary, adr, adr_type, val, elemtype, bt, MO_UNORDERED | IN_HEAP | IS_ARRAY);
323 dec_sp(3);
324 }
325
326
327 //------------------------------array_addressing-------------------------------
328 // Pull array and index from the stack. Compute pointer-to-element.
329 Node* Parse::array_addressing(BasicType type, int vals, const Type*& elemtype) {
330 Node *idx = peek(0+vals); // Get from stack without popping
331 Node *ary = peek(1+vals); // in case of exception
332
333 // Null check the array base, with correct stack contents
334 ary = null_check(ary, T_ARRAY);
335 // Compile-time detect of null-exception?
336 if (stopped()) return top();
337
338 const TypeAryPtr* arytype = _gvn.type(ary)->is_aryptr();
339 const TypeInt* sizetype = arytype->size();
340 elemtype = arytype->elem();
341
342 if (UseUniqueSubclasses) {
343 const Type* el = elemtype->make_ptr();
344 if (el && el->isa_instptr()) {
345 const TypeInstPtr* toop = el->is_instptr();
346 if (toop->instance_klass()->unique_concrete_subklass()) {
347 // If we load from "AbstractClass[]" we must see "ConcreteSubClass".
348 const Type* subklass = Type::get_const_type(toop->instance_klass());
349 elemtype = subklass->join_speculative(el);
350 }
351 }
352 }
353
354 // Check for big class initializers with all constant offsets
355 // feeding into a known-size array.
356 const TypeInt* idxtype = _gvn.type(idx)->is_int();
357 // See if the highest idx value is less than the lowest array bound,
358 // and if the idx value cannot be negative:
359 bool need_range_check = true;
360 if (idxtype->_hi < sizetype->_lo && idxtype->_lo >= 0) {
361 need_range_check = false;
362 if (C->log() != nullptr) C->log()->elem("observe that='!need_range_check'");
363 }
364
365 if (!arytype->is_loaded()) {
366 // Only fails for some -Xcomp runs
367 // The class is unloaded. We have to run this bytecode in the interpreter.
368 ciKlass* klass = arytype->unloaded_klass();
369
370 uncommon_trap(Deoptimization::Reason_unloaded,
371 Deoptimization::Action_reinterpret,
372 klass, "!loaded array");
373 return top();
374 }
375
376 // Do the range check
377 if (need_range_check) {
378 Node* tst;
379 if (sizetype->_hi <= 0) {
380 // The greatest array bound is negative, so we can conclude that we're
381 // compiling unreachable code, but the unsigned compare trick used below
382 // only works with non-negative lengths. Instead, hack "tst" to be zero so
383 // the uncommon_trap path will always be taken.
384 tst = _gvn.intcon(0);
385 } else {
386 // Range is constant in array-oop, so we can use the original state of mem
387 Node* len = load_array_length(ary);
388
389 // Test length vs index (standard trick using unsigned compare)
390 Node* chk = _gvn.transform( new CmpUNode(idx, len) );
391 BoolTest::mask btest = BoolTest::lt;
392 tst = _gvn.transform( new BoolNode(chk, btest) );
393 }
394 RangeCheckNode* rc = new RangeCheckNode(control(), tst, PROB_MAX, COUNT_UNKNOWN);
395 _gvn.set_type(rc, rc->Value(&_gvn));
396 if (!tst->is_Con()) {
397 record_for_igvn(rc);
398 }
399 set_control(_gvn.transform(new IfTrueNode(rc)));
400 // Branch to failure if out of bounds
401 {
402 PreserveJVMState pjvms(this);
403 set_control(_gvn.transform(new IfFalseNode(rc)));
404 if (C->allow_range_check_smearing()) {
405 // Do not use builtin_throw, since range checks are sometimes
406 // made more stringent by an optimistic transformation.
407 // This creates "tentative" range checks at this point,
408 // which are not guaranteed to throw exceptions.
409 // See IfNode::Ideal, is_range_check, adjust_check.
410 uncommon_trap(Deoptimization::Reason_range_check,
411 Deoptimization::Action_make_not_entrant,
412 nullptr, "range_check");
413 } else {
414 // If we have already recompiled with the range-check-widening
415 // heroic optimization turned off, then we must really be throwing
416 // range check exceptions.
417 builtin_throw(Deoptimization::Reason_range_check);
418 }
419 }
420 }
421 // Check for always knowing you are throwing a range-check exception
422 if (stopped()) return top();
423
424 // This could be an access to an inline type array. We can't tell if it's
425 // flat or not. Knowing the exact type avoids runtime checks and leads to
426 // a much simpler graph shape. Check profile information.
427 if (!arytype->is_flat() && !arytype->is_not_flat()) {
428 // First check the speculative type
429 Deoptimization::DeoptReason reason = Deoptimization::Reason_speculate_class_check;
430 ciKlass* array_type = arytype->speculative_type();
431 if (too_many_traps_or_recompiles(reason) || array_type == nullptr) {
432 // No speculative type, check profile data at this bci
433 array_type = nullptr;
434 reason = Deoptimization::Reason_class_check;
435 if (UseArrayLoadStoreProfile && !too_many_traps_or_recompiles(reason)) {
436 ciKlass* element_type = nullptr;
437 ProfilePtrKind element_ptr = ProfileMaybeNull;
438 bool flat_array = true;
439 bool null_free_array = true;
440 method()->array_access_profiled_type(bci(), array_type, element_type, element_ptr, flat_array, null_free_array);
441 }
442 }
443 if (array_type != nullptr) {
444 // Speculate that this array has the exact type reported by profile data
445 Node* better_ary = nullptr;
446 DEBUG_ONLY(Node* old_control = control();)
447 Node* slow_ctl = type_check_receiver(ary, array_type, 1.0, &better_ary);
448 if (stopped()) {
449 // The check always fails and therefore profile information is incorrect. Don't use it.
450 assert(old_control == slow_ctl, "type check should have been removed");
451 set_control(slow_ctl);
452 } else if (!slow_ctl->is_top()) {
453 { PreserveJVMState pjvms(this);
454 set_control(slow_ctl);
455 uncommon_trap_exact(reason, Deoptimization::Action_maybe_recompile);
456 }
457 replace_in_map(ary, better_ary);
458 ary = better_ary;
459 arytype = _gvn.type(ary)->is_aryptr();
460 elemtype = arytype->elem();
461 }
462 }
463 } else if (UseTypeSpeculation && UseArrayLoadStoreProfile) {
464 // No need to speculate: feed profile data at this bci for the
465 // array to type speculation
466 ciKlass* array_type = nullptr;
467 ciKlass* element_type = nullptr;
468 ProfilePtrKind element_ptr = ProfileMaybeNull;
469 bool flat_array = true;
470 bool null_free_array = true;
471 method()->array_access_profiled_type(bci(), array_type, element_type, element_ptr, flat_array, null_free_array);
472 if (array_type != nullptr) {
473 ary = record_profile_for_speculation(ary, array_type, ProfileMaybeNull);
474 }
475 }
476
477 // We have no exact array type from profile data. Check profile data
478 // for a non null-free or non flat array. Non null-free implies non
479 // flat so check this one first. Speculating on a non null-free
480 // array doesn't help aaload but could be profitable for a
481 // subsequent aastore.
482 if (!arytype->is_null_free() && !arytype->is_not_null_free()) {
483 bool null_free_array = true;
484 Deoptimization::DeoptReason reason = Deoptimization::Reason_none;
485 if (arytype->speculative() != nullptr &&
486 arytype->speculative()->is_aryptr()->is_not_null_free() &&
487 !too_many_traps_or_recompiles(Deoptimization::Reason_speculate_class_check)) {
488 null_free_array = false;
489 reason = Deoptimization::Reason_speculate_class_check;
490 } else if (UseArrayLoadStoreProfile && !too_many_traps_or_recompiles(Deoptimization::Reason_class_check)) {
491 ciKlass* array_type = nullptr;
492 ciKlass* element_type = nullptr;
493 ProfilePtrKind element_ptr = ProfileMaybeNull;
494 bool flat_array = true;
495 method()->array_access_profiled_type(bci(), array_type, element_type, element_ptr, flat_array, null_free_array);
496 reason = Deoptimization::Reason_class_check;
497 }
498 if (!null_free_array) {
499 { // Deoptimize if null-free array
500 BuildCutout unless(this, null_free_array_test(load_object_klass(ary), /* null_free = */ false), PROB_MAX);
501 uncommon_trap_exact(reason, Deoptimization::Action_maybe_recompile);
502 }
503 assert(!stopped(), "null-free array should have been caught earlier");
504 Node* better_ary = _gvn.transform(new CheckCastPPNode(control(), ary, arytype->cast_to_not_null_free()));
505 replace_in_map(ary, better_ary);
506 ary = better_ary;
507 arytype = _gvn.type(ary)->is_aryptr();
508 }
509 }
510
511 if (!arytype->is_flat() && !arytype->is_not_flat()) {
512 bool flat_array = true;
513 Deoptimization::DeoptReason reason = Deoptimization::Reason_none;
514 if (arytype->speculative() != nullptr &&
515 arytype->speculative()->is_aryptr()->is_not_flat() &&
516 !too_many_traps_or_recompiles(Deoptimization::Reason_speculate_class_check)) {
517 flat_array = false;
518 reason = Deoptimization::Reason_speculate_class_check;
519 } else if (UseArrayLoadStoreProfile && !too_many_traps_or_recompiles(reason)) {
520 ciKlass* array_type = nullptr;
521 ciKlass* element_type = nullptr;
522 ProfilePtrKind element_ptr = ProfileMaybeNull;
523 bool null_free_array = true;
524 method()->array_access_profiled_type(bci(), array_type, element_type, element_ptr, flat_array, null_free_array);
525 reason = Deoptimization::Reason_class_check;
526 }
527 if (!flat_array) {
528 { // Deoptimize if flat array
529 BuildCutout unless(this, flat_array_test(ary, /* flat = */ false), PROB_MAX);
530 uncommon_trap_exact(reason, Deoptimization::Action_maybe_recompile);
531 }
532 assert(!stopped(), "flat array should have been caught earlier");
533 Node* better_ary = _gvn.transform(new CheckCastPPNode(control(), ary, arytype->cast_to_not_flat()));
534 replace_in_map(ary, better_ary);
535 ary = better_ary;
536 arytype = _gvn.type(ary)->is_aryptr();
537 }
538 }
539
540 // Make array address computation control dependent to prevent it
541 // from floating above the range check during loop optimizations.
542 Node* ptr = array_element_address(ary, idx, type, sizetype, control());
543 assert(ptr != top(), "top should go hand-in-hand with stopped");
544
545 return ptr;
546 }
547
548
549 // returns IfNode
550 IfNode* Parse::jump_if_fork_int(Node* a, Node* b, BoolTest::mask mask, float prob, float cnt) {
551 Node *cmp = _gvn.transform(new CmpINode(a, b)); // two cases: shiftcount > 32 and shiftcount <= 32
552 Node *tst = _gvn.transform(new BoolNode(cmp, mask));
553 IfNode *iff = create_and_map_if(control(), tst, prob, cnt);
554 return iff;
555 }
556
557
558 // sentinel value for the target bci to mark never taken branches
559 // (according to profiling)
560 static const int never_reached = INT_MAX;
561
562 //------------------------------helper for tableswitch-------------------------
563 void Parse::jump_if_true_fork(IfNode *iff, int dest_bci_if_true, bool unc) {
564 // True branch, use existing map info
565 { PreserveJVMState pjvms(this);
566 Node *iftrue = _gvn.transform( new IfTrueNode (iff) );
567 set_control( iftrue );
568 if (unc) {
569 repush_if_args();
570 uncommon_trap(Deoptimization::Reason_unstable_if,
571 Deoptimization::Action_reinterpret,
572 nullptr,
573 "taken always");
574 } else {
575 assert(dest_bci_if_true != never_reached, "inconsistent dest");
576 merge_new_path(dest_bci_if_true);
577 }
578 }
579
580 // False branch
581 Node *iffalse = _gvn.transform( new IfFalseNode(iff) );
582 set_control( iffalse );
583 }
584
585 void Parse::jump_if_false_fork(IfNode *iff, int dest_bci_if_true, bool unc) {
586 // True branch, use existing map info
587 { PreserveJVMState pjvms(this);
588 Node *iffalse = _gvn.transform( new IfFalseNode (iff) );
589 set_control( iffalse );
590 if (unc) {
591 repush_if_args();
592 uncommon_trap(Deoptimization::Reason_unstable_if,
593 Deoptimization::Action_reinterpret,
594 nullptr,
595 "taken never");
596 } else {
597 assert(dest_bci_if_true != never_reached, "inconsistent dest");
598 merge_new_path(dest_bci_if_true);
599 }
600 }
601
602 // False branch
603 Node *iftrue = _gvn.transform( new IfTrueNode(iff) );
604 set_control( iftrue );
605 }
606
607 void Parse::jump_if_always_fork(int dest_bci, bool unc) {
608 // False branch, use existing map and control()
609 if (unc) {
610 repush_if_args();
611 uncommon_trap(Deoptimization::Reason_unstable_if,
612 Deoptimization::Action_reinterpret,
613 nullptr,
614 "taken never");
615 } else {
616 assert(dest_bci != never_reached, "inconsistent dest");
617 merge_new_path(dest_bci);
618 }
619 }
620
621
622 extern "C" {
623 static int jint_cmp(const void *i, const void *j) {
624 int a = *(jint *)i;
625 int b = *(jint *)j;
626 return a > b ? 1 : a < b ? -1 : 0;
627 }
628 }
629
630
631 class SwitchRange : public StackObj {
632 // a range of integers coupled with a bci destination
633 jint _lo; // inclusive lower limit
634 jint _hi; // inclusive upper limit
635 int _dest;
636 float _cnt; // how many times this range was hit according to profiling
637
638 public:
639 jint lo() const { return _lo; }
640 jint hi() const { return _hi; }
641 int dest() const { return _dest; }
642 bool is_singleton() const { return _lo == _hi; }
643 float cnt() const { return _cnt; }
644
645 void setRange(jint lo, jint hi, int dest, float cnt) {
646 assert(lo <= hi, "must be a non-empty range");
647 _lo = lo, _hi = hi; _dest = dest; _cnt = cnt;
648 assert(_cnt >= 0, "");
649 }
650 bool adjoinRange(jint lo, jint hi, int dest, float cnt, bool trim_ranges) {
651 assert(lo <= hi, "must be a non-empty range");
652 if (lo == _hi+1) {
653 // see merge_ranges() comment below
654 if (trim_ranges) {
655 if (cnt == 0) {
656 if (_cnt != 0) {
657 return false;
658 }
659 if (dest != _dest) {
660 _dest = never_reached;
661 }
662 } else {
663 if (_cnt == 0) {
664 return false;
665 }
666 if (dest != _dest) {
667 return false;
668 }
669 }
670 } else {
671 if (dest != _dest) {
672 return false;
673 }
674 }
675 _hi = hi;
676 _cnt += cnt;
677 return true;
678 }
679 return false;
680 }
681
682 void set (jint value, int dest, float cnt) {
683 setRange(value, value, dest, cnt);
684 }
685 bool adjoin(jint value, int dest, float cnt, bool trim_ranges) {
686 return adjoinRange(value, value, dest, cnt, trim_ranges);
687 }
688 bool adjoin(SwitchRange& other) {
689 return adjoinRange(other._lo, other._hi, other._dest, other._cnt, false);
690 }
691
692 void print() {
693 if (is_singleton())
694 tty->print(" {%d}=>%d (cnt=%f)", lo(), dest(), cnt());
695 else if (lo() == min_jint)
696 tty->print(" {..%d}=>%d (cnt=%f)", hi(), dest(), cnt());
697 else if (hi() == max_jint)
698 tty->print(" {%d..}=>%d (cnt=%f)", lo(), dest(), cnt());
699 else
700 tty->print(" {%d..%d}=>%d (cnt=%f)", lo(), hi(), dest(), cnt());
701 }
702 };
703
704 // We try to minimize the number of ranges and the size of the taken
705 // ones using profiling data. When ranges are created,
706 // SwitchRange::adjoinRange() only allows 2 adjoining ranges to merge
707 // if both were never hit or both were hit to build longer unreached
708 // ranges. Here, we now merge adjoining ranges with the same
709 // destination and finally set destination of unreached ranges to the
710 // special value never_reached because it can help minimize the number
711 // of tests that are necessary.
712 //
713 // For instance:
714 // [0, 1] to target1 sometimes taken
715 // [1, 2] to target1 never taken
716 // [2, 3] to target2 never taken
717 // would lead to:
718 // [0, 1] to target1 sometimes taken
719 // [1, 3] never taken
720 //
721 // (first 2 ranges to target1 are not merged)
722 static void merge_ranges(SwitchRange* ranges, int& rp) {
723 if (rp == 0) {
724 return;
725 }
726 int shift = 0;
727 for (int j = 0; j < rp; j++) {
728 SwitchRange& r1 = ranges[j-shift];
729 SwitchRange& r2 = ranges[j+1];
730 if (r1.adjoin(r2)) {
731 shift++;
732 } else if (shift > 0) {
733 ranges[j+1-shift] = r2;
734 }
735 }
736 rp -= shift;
737 for (int j = 0; j <= rp; j++) {
738 SwitchRange& r = ranges[j];
739 if (r.cnt() == 0 && r.dest() != never_reached) {
740 r.setRange(r.lo(), r.hi(), never_reached, r.cnt());
741 }
742 }
743 }
744
745 //-------------------------------do_tableswitch--------------------------------
746 void Parse::do_tableswitch() {
747 // Get information about tableswitch
748 int default_dest = iter().get_dest_table(0);
749 jint lo_index = iter().get_int_table(1);
750 jint hi_index = iter().get_int_table(2);
751 int len = hi_index - lo_index + 1;
752
753 if (len < 1) {
754 // If this is a backward branch, add safepoint
755 maybe_add_safepoint(default_dest);
756 pop(); // the effect of the instruction execution on the operand stack
757 merge(default_dest);
758 return;
759 }
760
761 ciMethodData* methodData = method()->method_data();
762 ciMultiBranchData* profile = nullptr;
763 if (methodData->is_mature() && UseSwitchProfiling) {
764 ciProfileData* data = methodData->bci_to_data(bci());
765 if (data != nullptr && data->is_MultiBranchData()) {
766 profile = (ciMultiBranchData*)data;
767 }
768 }
769 bool trim_ranges = !C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if);
770
771 // generate decision tree, using trichotomy when possible
772 int rnum = len+2;
773 bool makes_backward_branch = (default_dest <= bci());
774 SwitchRange* ranges = NEW_RESOURCE_ARRAY(SwitchRange, rnum);
775 int rp = -1;
776 if (lo_index != min_jint) {
777 float cnt = 1.0F;
778 if (profile != nullptr) {
779 cnt = (float)profile->default_count() / (hi_index != max_jint ? 2.0F : 1.0F);
780 }
781 ranges[++rp].setRange(min_jint, lo_index-1, default_dest, cnt);
782 }
783 for (int j = 0; j < len; j++) {
784 jint match_int = lo_index+j;
785 int dest = iter().get_dest_table(j+3);
786 makes_backward_branch |= (dest <= bci());
787 float cnt = 1.0F;
788 if (profile != nullptr) {
789 cnt = (float)profile->count_at(j);
790 }
791 if (rp < 0 || !ranges[rp].adjoin(match_int, dest, cnt, trim_ranges)) {
792 ranges[++rp].set(match_int, dest, cnt);
793 }
794 }
795 jint highest = lo_index+(len-1);
796 assert(ranges[rp].hi() == highest, "");
797 if (highest != max_jint) {
798 float cnt = 1.0F;
799 if (profile != nullptr) {
800 cnt = (float)profile->default_count() / (lo_index != min_jint ? 2.0F : 1.0F);
801 }
802 if (!ranges[rp].adjoinRange(highest+1, max_jint, default_dest, cnt, trim_ranges)) {
803 ranges[++rp].setRange(highest+1, max_jint, default_dest, cnt);
804 }
805 }
806 assert(rp < len+2, "not too many ranges");
807
808 if (trim_ranges) {
809 merge_ranges(ranges, rp);
810 }
811
812 // Safepoint in case if backward branch observed
813 if (makes_backward_branch) {
814 add_safepoint();
815 }
816
817 Node* lookup = pop(); // lookup value
818 jump_switch_ranges(lookup, &ranges[0], &ranges[rp]);
819 }
820
821
822 //------------------------------do_lookupswitch--------------------------------
823 void Parse::do_lookupswitch() {
824 // Get information about lookupswitch
825 int default_dest = iter().get_dest_table(0);
826 jint len = iter().get_int_table(1);
827
828 if (len < 1) { // If this is a backward branch, add safepoint
829 maybe_add_safepoint(default_dest);
830 pop(); // the effect of the instruction execution on the operand stack
831 merge(default_dest);
832 return;
833 }
834
835 ciMethodData* methodData = method()->method_data();
836 ciMultiBranchData* profile = nullptr;
837 if (methodData->is_mature() && UseSwitchProfiling) {
838 ciProfileData* data = methodData->bci_to_data(bci());
839 if (data != nullptr && data->is_MultiBranchData()) {
840 profile = (ciMultiBranchData*)data;
841 }
842 }
843 bool trim_ranges = !C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if);
844
845 // generate decision tree, using trichotomy when possible
846 jint* table = NEW_RESOURCE_ARRAY(jint, len*3);
847 {
848 for (int j = 0; j < len; j++) {
849 table[3*j+0] = iter().get_int_table(2+2*j);
850 table[3*j+1] = iter().get_dest_table(2+2*j+1);
851 // Handle overflow when converting from uint to jint
852 table[3*j+2] = (profile == nullptr) ? 1 : (jint)MIN2<uint>((uint)max_jint, profile->count_at(j));
853 }
854 qsort(table, len, 3*sizeof(table[0]), jint_cmp);
855 }
856
857 float default_cnt = 1.0F;
858 if (profile != nullptr) {
859 juint defaults = max_juint - len;
860 default_cnt = (float)profile->default_count()/(float)defaults;
861 }
862
863 int rnum = len*2+1;
864 bool makes_backward_branch = (default_dest <= bci());
865 SwitchRange* ranges = NEW_RESOURCE_ARRAY(SwitchRange, rnum);
866 int rp = -1;
867 for (int j = 0; j < len; j++) {
868 jint match_int = table[3*j+0];
869 jint dest = table[3*j+1];
870 jint cnt = table[3*j+2];
871 jint next_lo = rp < 0 ? min_jint : ranges[rp].hi()+1;
872 makes_backward_branch |= (dest <= bci());
873 float c = default_cnt * ((float)match_int - (float)next_lo);
874 if (match_int != next_lo && (rp < 0 || !ranges[rp].adjoinRange(next_lo, match_int-1, default_dest, c, trim_ranges))) {
875 assert(default_dest != never_reached, "sentinel value for dead destinations");
876 ranges[++rp].setRange(next_lo, match_int-1, default_dest, c);
877 }
878 if (rp < 0 || !ranges[rp].adjoin(match_int, dest, (float)cnt, trim_ranges)) {
879 assert(dest != never_reached, "sentinel value for dead destinations");
880 ranges[++rp].set(match_int, dest, (float)cnt);
881 }
882 }
883 jint highest = table[3*(len-1)];
884 assert(ranges[rp].hi() == highest, "");
885 if (highest != max_jint &&
886 !ranges[rp].adjoinRange(highest+1, max_jint, default_dest, default_cnt * ((float)max_jint - (float)highest), trim_ranges)) {
887 ranges[++rp].setRange(highest+1, max_jint, default_dest, default_cnt * ((float)max_jint - (float)highest));
888 }
889 assert(rp < rnum, "not too many ranges");
890
891 if (trim_ranges) {
892 merge_ranges(ranges, rp);
893 }
894
895 // Safepoint in case backward branch observed
896 if (makes_backward_branch) {
897 add_safepoint();
898 }
899
900 Node *lookup = pop(); // lookup value
901 jump_switch_ranges(lookup, &ranges[0], &ranges[rp]);
902 }
903
904 static float if_prob(float taken_cnt, float total_cnt) {
905 assert(taken_cnt <= total_cnt, "");
906 if (total_cnt == 0) {
907 return PROB_FAIR;
908 }
909 float p = taken_cnt / total_cnt;
910 return clamp(p, PROB_MIN, PROB_MAX);
911 }
912
913 static float if_cnt(float cnt) {
914 if (cnt == 0) {
915 return COUNT_UNKNOWN;
916 }
917 return cnt;
918 }
919
920 static float sum_of_cnts(SwitchRange *lo, SwitchRange *hi) {
921 float total_cnt = 0;
922 for (SwitchRange* sr = lo; sr <= hi; sr++) {
923 total_cnt += sr->cnt();
924 }
925 return total_cnt;
926 }
927
928 class SwitchRanges : public ResourceObj {
929 public:
930 SwitchRange* _lo;
931 SwitchRange* _hi;
932 SwitchRange* _mid;
933 float _cost;
934
935 enum {
936 Start,
937 LeftDone,
938 RightDone,
939 Done
940 } _state;
941
942 SwitchRanges(SwitchRange *lo, SwitchRange *hi)
943 : _lo(lo), _hi(hi), _mid(nullptr),
944 _cost(0), _state(Start) {
945 }
946
947 SwitchRanges()
948 : _lo(nullptr), _hi(nullptr), _mid(nullptr),
949 _cost(0), _state(Start) {}
950 };
951
952 // Estimate cost of performing a binary search on lo..hi
953 static float compute_tree_cost(SwitchRange *lo, SwitchRange *hi, float total_cnt) {
954 GrowableArray<SwitchRanges> tree;
955 SwitchRanges root(lo, hi);
956 tree.push(root);
957
958 float cost = 0;
959 do {
960 SwitchRanges& r = *tree.adr_at(tree.length()-1);
961 if (r._hi != r._lo) {
962 if (r._mid == nullptr) {
963 float r_cnt = sum_of_cnts(r._lo, r._hi);
964
965 if (r_cnt == 0) {
966 tree.pop();
967 cost = 0;
968 continue;
969 }
970
971 SwitchRange* mid = nullptr;
972 mid = r._lo;
973 for (float cnt = 0; ; ) {
974 assert(mid <= r._hi, "out of bounds");
975 cnt += mid->cnt();
976 if (cnt > r_cnt / 2) {
977 break;
978 }
979 mid++;
980 }
981 assert(mid <= r._hi, "out of bounds");
982 r._mid = mid;
983 r._cost = r_cnt / total_cnt;
984 }
985 r._cost += cost;
986 if (r._state < SwitchRanges::LeftDone && r._mid > r._lo) {
987 cost = 0;
988 r._state = SwitchRanges::LeftDone;
989 tree.push(SwitchRanges(r._lo, r._mid-1));
990 } else if (r._state < SwitchRanges::RightDone) {
991 cost = 0;
992 r._state = SwitchRanges::RightDone;
993 tree.push(SwitchRanges(r._mid == r._lo ? r._mid+1 : r._mid, r._hi));
994 } else {
995 tree.pop();
996 cost = r._cost;
997 }
998 } else {
999 tree.pop();
1000 cost = r._cost;
1001 }
1002 } while (tree.length() > 0);
1003
1004
1005 return cost;
1006 }
1007
1008 // It sometimes pays off to test most common ranges before the binary search
1009 void Parse::linear_search_switch_ranges(Node* key_val, SwitchRange*& lo, SwitchRange*& hi) {
1010 uint nr = hi - lo + 1;
1011 float total_cnt = sum_of_cnts(lo, hi);
1012
1013 float min = compute_tree_cost(lo, hi, total_cnt);
1014 float extra = 1;
1015 float sub = 0;
1016
1017 SwitchRange* array1 = lo;
1018 SwitchRange* array2 = NEW_RESOURCE_ARRAY(SwitchRange, nr);
1019
1020 SwitchRange* ranges = nullptr;
1021
1022 while (nr >= 2) {
1023 assert(lo == array1 || lo == array2, "one the 2 already allocated arrays");
1024 ranges = (lo == array1) ? array2 : array1;
1025
1026 // Find highest frequency range
1027 SwitchRange* candidate = lo;
1028 for (SwitchRange* sr = lo+1; sr <= hi; sr++) {
1029 if (sr->cnt() > candidate->cnt()) {
1030 candidate = sr;
1031 }
1032 }
1033 SwitchRange most_freq = *candidate;
1034 if (most_freq.cnt() == 0) {
1035 break;
1036 }
1037
1038 // Copy remaining ranges into another array
1039 int shift = 0;
1040 for (uint i = 0; i < nr; i++) {
1041 SwitchRange* sr = &lo[i];
1042 if (sr != candidate) {
1043 ranges[i-shift] = *sr;
1044 } else {
1045 shift++;
1046 if (i > 0 && i < nr-1) {
1047 SwitchRange prev = lo[i-1];
1048 prev.setRange(prev.lo(), sr->hi(), prev.dest(), prev.cnt());
1049 if (prev.adjoin(lo[i+1])) {
1050 shift++;
1051 i++;
1052 }
1053 ranges[i-shift] = prev;
1054 }
1055 }
1056 }
1057 nr -= shift;
1058
1059 // Evaluate cost of testing the most common range and performing a
1060 // binary search on the other ranges
1061 float cost = extra + compute_tree_cost(&ranges[0], &ranges[nr-1], total_cnt);
1062 if (cost >= min) {
1063 break;
1064 }
1065 // swap arrays
1066 lo = &ranges[0];
1067 hi = &ranges[nr-1];
1068
1069 // It pays off: emit the test for the most common range
1070 assert(most_freq.cnt() > 0, "must be taken");
1071 Node* val = _gvn.transform(new SubINode(key_val, _gvn.intcon(most_freq.lo())));
1072 Node* cmp = _gvn.transform(new CmpUNode(val, _gvn.intcon(java_subtract(most_freq.hi(), most_freq.lo()))));
1073 Node* tst = _gvn.transform(new BoolNode(cmp, BoolTest::le));
1074 IfNode* iff = create_and_map_if(control(), tst, if_prob(most_freq.cnt(), total_cnt), if_cnt(most_freq.cnt()));
1075 jump_if_true_fork(iff, most_freq.dest(), false);
1076
1077 sub += most_freq.cnt() / total_cnt;
1078 extra += 1 - sub;
1079 min = cost;
1080 }
1081 }
1082
1083 //----------------------------create_jump_tables-------------------------------
1084 bool Parse::create_jump_tables(Node* key_val, SwitchRange* lo, SwitchRange* hi) {
1085 // Are jumptables enabled
1086 if (!UseJumpTables) return false;
1087
1088 // Are jumptables supported
1089 if (!Matcher::has_match_rule(Op_Jump)) return false;
1090
1091 bool trim_ranges = !C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if);
1092
1093 // Decide if a guard is needed to lop off big ranges at either (or
1094 // both) end(s) of the input set. We'll call this the default target
1095 // even though we can't be sure that it is the true "default".
1096
1097 bool needs_guard = false;
1098 int default_dest;
1099 int64_t total_outlier_size = 0;
1100 int64_t hi_size = ((int64_t)hi->hi()) - ((int64_t)hi->lo()) + 1;
1101 int64_t lo_size = ((int64_t)lo->hi()) - ((int64_t)lo->lo()) + 1;
1102
1103 if (lo->dest() == hi->dest()) {
1104 total_outlier_size = hi_size + lo_size;
1105 default_dest = lo->dest();
1106 } else if (lo_size > hi_size) {
1107 total_outlier_size = lo_size;
1108 default_dest = lo->dest();
1109 } else {
1110 total_outlier_size = hi_size;
1111 default_dest = hi->dest();
1112 }
1113
1114 float total = sum_of_cnts(lo, hi);
1115 float cost = compute_tree_cost(lo, hi, total);
1116
1117 // If a guard test will eliminate very sparse end ranges, then
1118 // it is worth the cost of an extra jump.
1119 float trimmed_cnt = 0;
1120 if (total_outlier_size > (MaxJumpTableSparseness * 4)) {
1121 needs_guard = true;
1122 if (default_dest == lo->dest()) {
1123 trimmed_cnt += lo->cnt();
1124 lo++;
1125 }
1126 if (default_dest == hi->dest()) {
1127 trimmed_cnt += hi->cnt();
1128 hi--;
1129 }
1130 }
1131
1132 // Find the total number of cases and ranges
1133 int64_t num_cases = ((int64_t)hi->hi()) - ((int64_t)lo->lo()) + 1;
1134 int num_range = hi - lo + 1;
1135
1136 // Don't create table if: too large, too small, or too sparse.
1137 if (num_cases > MaxJumpTableSize)
1138 return false;
1139 if (UseSwitchProfiling) {
1140 // MinJumpTableSize is set so with a well balanced binary tree,
1141 // when the number of ranges is MinJumpTableSize, it's cheaper to
1142 // go through a JumpNode that a tree of IfNodes. Average cost of a
1143 // tree of IfNodes with MinJumpTableSize is
1144 // log2f(MinJumpTableSize) comparisons. So if the cost computed
1145 // from profile data is less than log2f(MinJumpTableSize) then
1146 // going with the binary search is cheaper.
1147 if (cost < log2f(MinJumpTableSize)) {
1148 return false;
1149 }
1150 } else {
1151 if (num_cases < MinJumpTableSize)
1152 return false;
1153 }
1154 if (num_cases > (MaxJumpTableSparseness * num_range))
1155 return false;
1156
1157 // Normalize table lookups to zero
1158 int lowval = lo->lo();
1159 key_val = _gvn.transform( new SubINode(key_val, _gvn.intcon(lowval)) );
1160
1161 // Generate a guard to protect against input keyvals that aren't
1162 // in the switch domain.
1163 if (needs_guard) {
1164 Node* size = _gvn.intcon(num_cases);
1165 Node* cmp = _gvn.transform(new CmpUNode(key_val, size));
1166 Node* tst = _gvn.transform(new BoolNode(cmp, BoolTest::ge));
1167 IfNode* iff = create_and_map_if(control(), tst, if_prob(trimmed_cnt, total), if_cnt(trimmed_cnt));
1168 jump_if_true_fork(iff, default_dest, trim_ranges && trimmed_cnt == 0);
1169
1170 total -= trimmed_cnt;
1171 }
1172
1173 // Create an ideal node JumpTable that has projections
1174 // of all possible ranges for a switch statement
1175 // The key_val input must be converted to a pointer offset and scaled.
1176 // Compare Parse::array_addressing above.
1177
1178 // Clean the 32-bit int into a real 64-bit offset.
1179 // Otherwise, the jint value 0 might turn into an offset of 0x0800000000.
1180 // Make I2L conversion control dependent to prevent it from
1181 // floating above the range check during loop optimizations.
1182 // Do not use a narrow int type here to prevent the data path from dying
1183 // while the control path is not removed. This can happen if the type of key_val
1184 // is later known to be out of bounds of [0, num_cases] and therefore a narrow cast
1185 // would be replaced by TOP while C2 is not able to fold the corresponding range checks.
1186 // Set _carry_dependency for the cast to avoid being removed by IGVN.
1187 #ifdef _LP64
1188 key_val = C->constrained_convI2L(&_gvn, key_val, TypeInt::INT, control(), true /* carry_dependency */);
1189 #endif
1190
1191 // Shift the value by wordsize so we have an index into the table, rather
1192 // than a switch value
1193 Node *shiftWord = _gvn.MakeConX(wordSize);
1194 key_val = _gvn.transform( new MulXNode( key_val, shiftWord));
1195
1196 // Create the JumpNode
1197 Arena* arena = C->comp_arena();
1198 float* probs = (float*)arena->Amalloc(sizeof(float)*num_cases);
1199 int i = 0;
1200 if (total == 0) {
1201 for (SwitchRange* r = lo; r <= hi; r++) {
1202 for (int64_t j = r->lo(); j <= r->hi(); j++, i++) {
1203 probs[i] = 1.0F / num_cases;
1204 }
1205 }
1206 } else {
1207 for (SwitchRange* r = lo; r <= hi; r++) {
1208 float prob = r->cnt()/total;
1209 for (int64_t j = r->lo(); j <= r->hi(); j++, i++) {
1210 probs[i] = prob / (r->hi() - r->lo() + 1);
1211 }
1212 }
1213 }
1214
1215 ciMethodData* methodData = method()->method_data();
1216 ciMultiBranchData* profile = nullptr;
1217 if (methodData->is_mature()) {
1218 ciProfileData* data = methodData->bci_to_data(bci());
1219 if (data != nullptr && data->is_MultiBranchData()) {
1220 profile = (ciMultiBranchData*)data;
1221 }
1222 }
1223
1224 Node* jtn = _gvn.transform(new JumpNode(control(), key_val, num_cases, probs, profile == nullptr ? COUNT_UNKNOWN : total));
1225
1226 // These are the switch destinations hanging off the jumpnode
1227 i = 0;
1228 for (SwitchRange* r = lo; r <= hi; r++) {
1229 for (int64_t j = r->lo(); j <= r->hi(); j++, i++) {
1230 Node* input = _gvn.transform(new JumpProjNode(jtn, i, r->dest(), (int)(j - lowval)));
1231 {
1232 PreserveJVMState pjvms(this);
1233 set_control(input);
1234 jump_if_always_fork(r->dest(), trim_ranges && r->cnt() == 0);
1235 }
1236 }
1237 }
1238 assert(i == num_cases, "miscount of cases");
1239 stop_and_kill_map(); // no more uses for this JVMS
1240 return true;
1241 }
1242
1243 //----------------------------jump_switch_ranges-------------------------------
1244 void Parse::jump_switch_ranges(Node* key_val, SwitchRange *lo, SwitchRange *hi, int switch_depth) {
1245 Block* switch_block = block();
1246 bool trim_ranges = !C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if);
1247
1248 if (switch_depth == 0) {
1249 // Do special processing for the top-level call.
1250 assert(lo->lo() == min_jint, "initial range must exhaust Type::INT");
1251 assert(hi->hi() == max_jint, "initial range must exhaust Type::INT");
1252
1253 // Decrement pred-numbers for the unique set of nodes.
1254 #ifdef ASSERT
1255 if (!trim_ranges) {
1256 // Ensure that the block's successors are a (duplicate-free) set.
1257 int successors_counted = 0; // block occurrences in [hi..lo]
1258 int unique_successors = switch_block->num_successors();
1259 for (int i = 0; i < unique_successors; i++) {
1260 Block* target = switch_block->successor_at(i);
1261
1262 // Check that the set of successors is the same in both places.
1263 int successors_found = 0;
1264 for (SwitchRange* p = lo; p <= hi; p++) {
1265 if (p->dest() == target->start()) successors_found++;
1266 }
1267 assert(successors_found > 0, "successor must be known");
1268 successors_counted += successors_found;
1269 }
1270 assert(successors_counted == (hi-lo)+1, "no unexpected successors");
1271 }
1272 #endif
1273
1274 // Maybe prune the inputs, based on the type of key_val.
1275 jint min_val = min_jint;
1276 jint max_val = max_jint;
1277 const TypeInt* ti = key_val->bottom_type()->isa_int();
1278 if (ti != nullptr) {
1279 min_val = ti->_lo;
1280 max_val = ti->_hi;
1281 assert(min_val <= max_val, "invalid int type");
1282 }
1283 while (lo->hi() < min_val) {
1284 lo++;
1285 }
1286 if (lo->lo() < min_val) {
1287 lo->setRange(min_val, lo->hi(), lo->dest(), lo->cnt());
1288 }
1289 while (hi->lo() > max_val) {
1290 hi--;
1291 }
1292 if (hi->hi() > max_val) {
1293 hi->setRange(hi->lo(), max_val, hi->dest(), hi->cnt());
1294 }
1295
1296 linear_search_switch_ranges(key_val, lo, hi);
1297 }
1298
1299 #ifndef PRODUCT
1300 if (switch_depth == 0) {
1301 _max_switch_depth = 0;
1302 _est_switch_depth = log2i_graceful((hi - lo + 1) - 1) + 1;
1303 }
1304 #endif
1305
1306 assert(lo <= hi, "must be a non-empty set of ranges");
1307 if (lo == hi) {
1308 jump_if_always_fork(lo->dest(), trim_ranges && lo->cnt() == 0);
1309 } else {
1310 assert(lo->hi() == (lo+1)->lo()-1, "contiguous ranges");
1311 assert(hi->lo() == (hi-1)->hi()+1, "contiguous ranges");
1312
1313 if (create_jump_tables(key_val, lo, hi)) return;
1314
1315 SwitchRange* mid = nullptr;
1316 float total_cnt = sum_of_cnts(lo, hi);
1317
1318 int nr = hi - lo + 1;
1319 if (UseSwitchProfiling) {
1320 // Don't keep the binary search tree balanced: pick up mid point
1321 // that split frequencies in half.
1322 float cnt = 0;
1323 for (SwitchRange* sr = lo; sr <= hi; sr++) {
1324 cnt += sr->cnt();
1325 if (cnt >= total_cnt / 2) {
1326 mid = sr;
1327 break;
1328 }
1329 }
1330 } else {
1331 mid = lo + nr/2;
1332
1333 // if there is an easy choice, pivot at a singleton:
1334 if (nr > 3 && !mid->is_singleton() && (mid-1)->is_singleton()) mid--;
1335
1336 assert(lo < mid && mid <= hi, "good pivot choice");
1337 assert(nr != 2 || mid == hi, "should pick higher of 2");
1338 assert(nr != 3 || mid == hi-1, "should pick middle of 3");
1339 }
1340
1341
1342 Node *test_val = _gvn.intcon(mid == lo ? mid->hi() : mid->lo());
1343
1344 if (mid->is_singleton()) {
1345 IfNode *iff_ne = jump_if_fork_int(key_val, test_val, BoolTest::ne, 1-if_prob(mid->cnt(), total_cnt), if_cnt(mid->cnt()));
1346 jump_if_false_fork(iff_ne, mid->dest(), trim_ranges && mid->cnt() == 0);
1347
1348 // Special Case: If there are exactly three ranges, and the high
1349 // and low range each go to the same place, omit the "gt" test,
1350 // since it will not discriminate anything.
1351 bool eq_test_only = (hi == lo+2 && hi->dest() == lo->dest() && mid == hi-1) || mid == lo;
1352
1353 // if there is a higher range, test for it and process it:
1354 if (mid < hi && !eq_test_only) {
1355 // two comparisons of same values--should enable 1 test for 2 branches
1356 // Use BoolTest::lt instead of BoolTest::gt
1357 float cnt = sum_of_cnts(lo, mid-1);
1358 IfNode *iff_lt = jump_if_fork_int(key_val, test_val, BoolTest::lt, if_prob(cnt, total_cnt), if_cnt(cnt));
1359 Node *iftrue = _gvn.transform( new IfTrueNode(iff_lt) );
1360 Node *iffalse = _gvn.transform( new IfFalseNode(iff_lt) );
1361 { PreserveJVMState pjvms(this);
1362 set_control(iffalse);
1363 jump_switch_ranges(key_val, mid+1, hi, switch_depth+1);
1364 }
1365 set_control(iftrue);
1366 }
1367
1368 } else {
1369 // mid is a range, not a singleton, so treat mid..hi as a unit
1370 float cnt = sum_of_cnts(mid == lo ? mid+1 : mid, hi);
1371 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));
1372
1373 // if there is a higher range, test for it and process it:
1374 if (mid == hi) {
1375 jump_if_true_fork(iff_ge, mid->dest(), trim_ranges && cnt == 0);
1376 } else {
1377 Node *iftrue = _gvn.transform( new IfTrueNode(iff_ge) );
1378 Node *iffalse = _gvn.transform( new IfFalseNode(iff_ge) );
1379 { PreserveJVMState pjvms(this);
1380 set_control(iftrue);
1381 jump_switch_ranges(key_val, mid == lo ? mid+1 : mid, hi, switch_depth+1);
1382 }
1383 set_control(iffalse);
1384 }
1385 }
1386
1387 // in any case, process the lower range
1388 if (mid == lo) {
1389 if (mid->is_singleton()) {
1390 jump_switch_ranges(key_val, lo+1, hi, switch_depth+1);
1391 } else {
1392 jump_if_always_fork(lo->dest(), trim_ranges && lo->cnt() == 0);
1393 }
1394 } else {
1395 jump_switch_ranges(key_val, lo, mid-1, switch_depth+1);
1396 }
1397 }
1398
1399 // Decrease pred_count for each successor after all is done.
1400 if (switch_depth == 0) {
1401 int unique_successors = switch_block->num_successors();
1402 for (int i = 0; i < unique_successors; i++) {
1403 Block* target = switch_block->successor_at(i);
1404 // Throw away the pre-allocated path for each unique successor.
1405 target->next_path_num();
1406 }
1407 }
1408
1409 #ifndef PRODUCT
1410 _max_switch_depth = MAX2(switch_depth, _max_switch_depth);
1411 if (TraceOptoParse && Verbose && WizardMode && switch_depth == 0) {
1412 SwitchRange* r;
1413 int nsing = 0;
1414 for( r = lo; r <= hi; r++ ) {
1415 if( r->is_singleton() ) nsing++;
1416 }
1417 tty->print(">>> ");
1418 _method->print_short_name();
1419 tty->print_cr(" switch decision tree");
1420 tty->print_cr(" %d ranges (%d singletons), max_depth=%d, est_depth=%d",
1421 (int) (hi-lo+1), nsing, _max_switch_depth, _est_switch_depth);
1422 if (_max_switch_depth > _est_switch_depth) {
1423 tty->print_cr("******** BAD SWITCH DEPTH ********");
1424 }
1425 tty->print(" ");
1426 for( r = lo; r <= hi; r++ ) {
1427 r->print();
1428 }
1429 tty->cr();
1430 }
1431 #endif
1432 }
1433
1434 void Parse::modf() {
1435 Node *f2 = pop();
1436 Node *f1 = pop();
1437 Node* c = make_runtime_call(RC_LEAF, OptoRuntime::modf_Type(),
1438 CAST_FROM_FN_PTR(address, SharedRuntime::frem),
1439 "frem", nullptr, //no memory effects
1440 f1, f2);
1441 Node* res = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 0));
1442
1443 push(res);
1444 }
1445
1446 void Parse::modd() {
1447 Node *d2 = pop_pair();
1448 Node *d1 = pop_pair();
1449 Node* c = make_runtime_call(RC_LEAF, OptoRuntime::Math_DD_D_Type(),
1450 CAST_FROM_FN_PTR(address, SharedRuntime::drem),
1451 "drem", nullptr, //no memory effects
1452 d1, top(), d2, top());
1453 Node* res_d = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 0));
1454
1455 #ifdef ASSERT
1456 Node* res_top = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 1));
1457 assert(res_top == top(), "second value must be top");
1458 #endif
1459
1460 push_pair(res_d);
1461 }
1462
1463 void Parse::l2f() {
1464 Node* f2 = pop();
1465 Node* f1 = pop();
1466 Node* c = make_runtime_call(RC_LEAF, OptoRuntime::l2f_Type(),
1467 CAST_FROM_FN_PTR(address, SharedRuntime::l2f),
1468 "l2f", nullptr, //no memory effects
1469 f1, f2);
1470 Node* res = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 0));
1471
1472 push(res);
1473 }
1474
1475 // Handle jsr and jsr_w bytecode
1476 void Parse::do_jsr() {
1477 assert(bc() == Bytecodes::_jsr || bc() == Bytecodes::_jsr_w, "wrong bytecode");
1478
1479 // Store information about current state, tagged with new _jsr_bci
1480 int return_bci = iter().next_bci();
1481 int jsr_bci = (bc() == Bytecodes::_jsr) ? iter().get_dest() : iter().get_far_dest();
1482
1483 // The way we do things now, there is only one successor block
1484 // for the jsr, because the target code is cloned by ciTypeFlow.
1485 Block* target = successor_for_bci(jsr_bci);
1486
1487 // What got pushed?
1488 const Type* ret_addr = target->peek();
1489 assert(ret_addr->singleton(), "must be a constant (cloned jsr body)");
1490
1491 // Effect on jsr on stack
1492 push(_gvn.makecon(ret_addr));
1493
1494 // Flow to the jsr.
1495 merge(jsr_bci);
1496 }
1497
1498 // Handle ret bytecode
1499 void Parse::do_ret() {
1500 // Find to whom we return.
1501 assert(block()->num_successors() == 1, "a ret can only go one place now");
1502 Block* target = block()->successor_at(0);
1503 assert(!target->is_ready(), "our arrival must be expected");
1504 int pnum = target->next_path_num();
1505 merge_common(target, pnum);
1506 }
1507
1508 static bool has_injected_profile(BoolTest::mask btest, Node* test, int& taken, int& not_taken) {
1509 if (btest != BoolTest::eq && btest != BoolTest::ne) {
1510 // Only ::eq and ::ne are supported for profile injection.
1511 return false;
1512 }
1513 if (test->is_Cmp() &&
1514 test->in(1)->Opcode() == Op_ProfileBoolean) {
1515 ProfileBooleanNode* profile = (ProfileBooleanNode*)test->in(1);
1516 int false_cnt = profile->false_count();
1517 int true_cnt = profile->true_count();
1518
1519 // Counts matching depends on the actual test operation (::eq or ::ne).
1520 // No need to scale the counts because profile injection was designed
1521 // to feed exact counts into VM.
1522 taken = (btest == BoolTest::eq) ? false_cnt : true_cnt;
1523 not_taken = (btest == BoolTest::eq) ? true_cnt : false_cnt;
1524
1525 profile->consume();
1526 return true;
1527 }
1528 return false;
1529 }
1530
1531 // Give up if too few (or too many, in which case the sum will overflow) counts to be meaningful.
1532 // We also check that individual counters are positive first, otherwise the sum can become positive.
1533 // (check for saturation, integer overflow, and immature counts)
1534 static bool counters_are_meaningful(int counter1, int counter2, int min) {
1535 // check for saturation, including "uint" values too big to fit in "int"
1536 if (counter1 < 0 || counter2 < 0) {
1537 return false;
1538 }
1539 // check for integer overflow of the sum
1540 int64_t sum = (int64_t)counter1 + (int64_t)counter2;
1541 STATIC_ASSERT(sizeof(counter1) < sizeof(sum));
1542 if (sum > INT_MAX) {
1543 return false;
1544 }
1545 // check if mature
1546 return (counter1 + counter2) >= min;
1547 }
1548
1549 //--------------------------dynamic_branch_prediction--------------------------
1550 // Try to gather dynamic branch prediction behavior. Return a probability
1551 // of the branch being taken and set the "cnt" field. Returns a -1.0
1552 // if we need to use static prediction for some reason.
1553 float Parse::dynamic_branch_prediction(float &cnt, BoolTest::mask btest, Node* test) {
1554 ResourceMark rm;
1555
1556 cnt = COUNT_UNKNOWN;
1557
1558 int taken = 0;
1559 int not_taken = 0;
1560
1561 bool use_mdo = !has_injected_profile(btest, test, taken, not_taken);
1562
1563 if (use_mdo) {
1564 // Use MethodData information if it is available
1565 // FIXME: free the ProfileData structure
1566 ciMethodData* methodData = method()->method_data();
1567 if (!methodData->is_mature()) return PROB_UNKNOWN;
1568 ciProfileData* data = methodData->bci_to_data(bci());
1569 if (data == nullptr) {
1570 return PROB_UNKNOWN;
1571 }
1572 if (!data->is_JumpData()) return PROB_UNKNOWN;
1573
1574 // get taken and not taken values
1575 // NOTE: saturated UINT_MAX values become negative,
1576 // as do counts above INT_MAX.
1577 taken = data->as_JumpData()->taken();
1578 not_taken = 0;
1579 if (data->is_BranchData()) {
1580 not_taken = data->as_BranchData()->not_taken();
1581 }
1582
1583 // scale the counts to be commensurate with invocation counts:
1584 // NOTE: overflow for positive values is clamped at INT_MAX
1585 taken = method()->scale_count(taken);
1586 not_taken = method()->scale_count(not_taken);
1587 }
1588 // At this point, saturation or overflow is indicated by INT_MAX
1589 // or a negative value.
1590
1591 // Give up if too few (or too many, in which case the sum will overflow) counts to be meaningful.
1592 // We also check that individual counters are positive first, otherwise the sum can become positive.
1593 if (!counters_are_meaningful(taken, not_taken, 40)) {
1594 if (C->log() != nullptr) {
1595 C->log()->elem("branch target_bci='%d' taken='%d' not_taken='%d'", iter().get_dest(), taken, not_taken);
1596 }
1597 return PROB_UNKNOWN;
1598 }
1599
1600 // Compute frequency that we arrive here
1601 float sum = taken + not_taken;
1602 // Adjust, if this block is a cloned private block but the
1603 // Jump counts are shared. Taken the private counts for
1604 // just this path instead of the shared counts.
1605 if( block()->count() > 0 )
1606 sum = block()->count();
1607 cnt = sum / FreqCountInvocations;
1608
1609 // Pin probability to sane limits
1610 float prob;
1611 if( !taken )
1612 prob = (0+PROB_MIN) / 2;
1613 else if( !not_taken )
1614 prob = (1+PROB_MAX) / 2;
1615 else { // Compute probability of true path
1616 prob = (float)taken / (float)(taken + not_taken);
1617 if (prob > PROB_MAX) prob = PROB_MAX;
1618 if (prob < PROB_MIN) prob = PROB_MIN;
1619 }
1620
1621 assert((cnt > 0.0f) && (prob > 0.0f),
1622 "Bad frequency assignment in if cnt=%g prob=%g taken=%d not_taken=%d", cnt, prob, taken, not_taken);
1623
1624 if (C->log() != nullptr) {
1625 const char* prob_str = nullptr;
1626 if (prob >= PROB_MAX) prob_str = (prob == PROB_MAX) ? "max" : "always";
1627 if (prob <= PROB_MIN) prob_str = (prob == PROB_MIN) ? "min" : "never";
1628 char prob_str_buf[30];
1629 if (prob_str == nullptr) {
1630 jio_snprintf(prob_str_buf, sizeof(prob_str_buf), "%20.2f", prob);
1631 prob_str = prob_str_buf;
1632 }
1633 C->log()->elem("branch target_bci='%d' taken='%d' not_taken='%d' cnt='%f' prob='%s'",
1634 iter().get_dest(), taken, not_taken, cnt, prob_str);
1635 }
1636 return prob;
1637 }
1638
1639 //-----------------------------branch_prediction-------------------------------
1640 float Parse::branch_prediction(float& cnt,
1641 BoolTest::mask btest,
1642 int target_bci,
1643 Node* test) {
1644 float prob = dynamic_branch_prediction(cnt, btest, test);
1645 // If prob is unknown, switch to static prediction
1646 if (prob != PROB_UNKNOWN) return prob;
1647
1648 prob = PROB_FAIR; // Set default value
1649 if (btest == BoolTest::eq) // Exactly equal test?
1650 prob = PROB_STATIC_INFREQUENT; // Assume its relatively infrequent
1651 else if (btest == BoolTest::ne)
1652 prob = PROB_STATIC_FREQUENT; // Assume its relatively frequent
1653
1654 // If this is a conditional test guarding a backwards branch,
1655 // assume its a loop-back edge. Make it a likely taken branch.
1656 if (target_bci < bci()) {
1657 if (is_osr_parse()) { // Could be a hot OSR'd loop; force deopt
1658 // Since it's an OSR, we probably have profile data, but since
1659 // branch_prediction returned PROB_UNKNOWN, the counts are too small.
1660 // Let's make a special check here for completely zero counts.
1661 ciMethodData* methodData = method()->method_data();
1662 if (!methodData->is_empty()) {
1663 ciProfileData* data = methodData->bci_to_data(bci());
1664 // Only stop for truly zero counts, which mean an unknown part
1665 // of the OSR-ed method, and we want to deopt to gather more stats.
1666 // If you have ANY counts, then this loop is simply 'cold' relative
1667 // to the OSR loop.
1668 if (data == nullptr ||
1669 (data->as_BranchData()->taken() + data->as_BranchData()->not_taken() == 0)) {
1670 // This is the only way to return PROB_UNKNOWN:
1671 return PROB_UNKNOWN;
1672 }
1673 }
1674 }
1675 prob = PROB_STATIC_FREQUENT; // Likely to take backwards branch
1676 }
1677
1678 assert(prob != PROB_UNKNOWN, "must have some guess at this point");
1679 return prob;
1680 }
1681
1682 // The magic constants are chosen so as to match the output of
1683 // branch_prediction() when the profile reports a zero taken count.
1684 // It is important to distinguish zero counts unambiguously, because
1685 // some branches (e.g., _213_javac.Assembler.eliminate) validly produce
1686 // very small but nonzero probabilities, which if confused with zero
1687 // counts would keep the program recompiling indefinitely.
1688 bool Parse::seems_never_taken(float prob) const {
1689 return prob < PROB_MIN;
1690 }
1691
1692 // True if the comparison seems to be the kind that will not change its
1693 // statistics from true to false. See comments in adjust_map_after_if.
1694 // This question is only asked along paths which are already
1695 // classified as untaken (by seems_never_taken), so really,
1696 // if a path is never taken, its controlling comparison is
1697 // already acting in a stable fashion. If the comparison
1698 // seems stable, we will put an expensive uncommon trap
1699 // on the untaken path.
1700 bool Parse::seems_stable_comparison() const {
1701 if (C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if)) {
1702 return false;
1703 }
1704 return true;
1705 }
1706
1707 //-------------------------------repush_if_args--------------------------------
1708 // Push arguments of an "if" bytecode back onto the stack by adjusting _sp.
1709 inline int Parse::repush_if_args() {
1710 if (PrintOpto && WizardMode) {
1711 tty->print("defending against excessive implicit null exceptions on %s @%d in ",
1712 Bytecodes::name(iter().cur_bc()), iter().cur_bci());
1713 method()->print_name(); tty->cr();
1714 }
1715 int bc_depth = - Bytecodes::depth(iter().cur_bc());
1716 assert(bc_depth == 1 || bc_depth == 2, "only two kinds of branches");
1717 DEBUG_ONLY(sync_jvms()); // argument(n) requires a synced jvms
1718 assert(argument(0) != nullptr, "must exist");
1719 assert(bc_depth == 1 || argument(1) != nullptr, "two must exist");
1720 inc_sp(bc_depth);
1721 return bc_depth;
1722 }
1723
1724 //----------------------------------do_ifnull----------------------------------
1725 void Parse::do_ifnull(BoolTest::mask btest, Node *c) {
1726 int target_bci = iter().get_dest();
1727
1728 Block* branch_block = successor_for_bci(target_bci);
1729 Block* next_block = successor_for_bci(iter().next_bci());
1730
1731 float cnt;
1732 float prob = branch_prediction(cnt, btest, target_bci, c);
1733 if (prob == PROB_UNKNOWN) {
1734 // (An earlier version of do_ifnull omitted this trap for OSR methods.)
1735 if (PrintOpto && Verbose) {
1736 tty->print_cr("Never-taken edge stops compilation at bci %d", bci());
1737 }
1738 repush_if_args(); // to gather stats on loop
1739 uncommon_trap(Deoptimization::Reason_unreached,
1740 Deoptimization::Action_reinterpret,
1741 nullptr, "cold");
1742 if (C->eliminate_boxing()) {
1743 // Mark the successor blocks as parsed
1744 branch_block->next_path_num();
1745 next_block->next_path_num();
1746 }
1747 return;
1748 }
1749
1750 NOT_PRODUCT(explicit_null_checks_inserted++);
1751
1752 // Generate real control flow
1753 Node *tst = _gvn.transform( new BoolNode( c, btest ) );
1754
1755 // Sanity check the probability value
1756 assert(prob > 0.0f,"Bad probability in Parser");
1757 // Need xform to put node in hash table
1758 IfNode *iff = create_and_xform_if( control(), tst, prob, cnt );
1759 assert(iff->_prob > 0.0f,"Optimizer made bad probability in parser");
1760 // True branch
1761 { PreserveJVMState pjvms(this);
1762 Node* iftrue = _gvn.transform( new IfTrueNode (iff) );
1763 set_control(iftrue);
1764
1765 if (stopped()) { // Path is dead?
1766 NOT_PRODUCT(explicit_null_checks_elided++);
1767 if (C->eliminate_boxing()) {
1768 // Mark the successor block as parsed
1769 branch_block->next_path_num();
1770 }
1771 } else { // Path is live.
1772 adjust_map_after_if(btest, c, prob, branch_block);
1773 if (!stopped()) {
1774 merge(target_bci);
1775 }
1776 }
1777 }
1778
1779 // False branch
1780 Node* iffalse = _gvn.transform( new IfFalseNode(iff) );
1781 set_control(iffalse);
1782
1783 if (stopped()) { // Path is dead?
1784 NOT_PRODUCT(explicit_null_checks_elided++);
1785 if (C->eliminate_boxing()) {
1786 // Mark the successor block as parsed
1787 next_block->next_path_num();
1788 }
1789 } else { // Path is live.
1790 adjust_map_after_if(BoolTest(btest).negate(), c, 1.0-prob, next_block);
1791 }
1792 }
1793
1794 //------------------------------------do_if------------------------------------
1795 void Parse::do_if(BoolTest::mask btest, Node* c, bool new_path, Node** ctrl_taken) {
1796 int target_bci = iter().get_dest();
1797
1798 Block* branch_block = successor_for_bci(target_bci);
1799 Block* next_block = successor_for_bci(iter().next_bci());
1800
1801 float cnt;
1802 float prob = branch_prediction(cnt, btest, target_bci, c);
1803 float untaken_prob = 1.0 - prob;
1804
1805 if (prob == PROB_UNKNOWN) {
1806 if (PrintOpto && Verbose) {
1807 tty->print_cr("Never-taken edge stops compilation at bci %d", bci());
1808 }
1809 repush_if_args(); // to gather stats on loop
1810 uncommon_trap(Deoptimization::Reason_unreached,
1811 Deoptimization::Action_reinterpret,
1812 nullptr, "cold");
1813 if (C->eliminate_boxing()) {
1814 // Mark the successor blocks as parsed
1815 branch_block->next_path_num();
1816 next_block->next_path_num();
1817 }
1818 return;
1819 }
1820
1821 // Sanity check the probability value
1822 assert(0.0f < prob && prob < 1.0f,"Bad probability in Parser");
1823
1824 bool taken_if_true = true;
1825 // Convert BoolTest to canonical form:
1826 if (!BoolTest(btest).is_canonical()) {
1827 btest = BoolTest(btest).negate();
1828 taken_if_true = false;
1829 // prob is NOT updated here; it remains the probability of the taken
1830 // path (as opposed to the prob of the path guarded by an 'IfTrueNode').
1831 }
1832 assert(btest != BoolTest::eq, "!= is the only canonical exact test");
1833
1834 Node* tst0 = new BoolNode(c, btest);
1835 Node* tst = _gvn.transform(tst0);
1836 BoolTest::mask taken_btest = BoolTest::illegal;
1837 BoolTest::mask untaken_btest = BoolTest::illegal;
1838
1839 if (tst->is_Bool()) {
1840 // Refresh c from the transformed bool node, since it may be
1841 // simpler than the original c. Also re-canonicalize btest.
1842 // This wins when (Bool ne (Conv2B p) 0) => (Bool ne (CmpP p null)).
1843 // That can arise from statements like: if (x instanceof C) ...
1844 if (tst != tst0) {
1845 // Canonicalize one more time since transform can change it.
1846 btest = tst->as_Bool()->_test._test;
1847 if (!BoolTest(btest).is_canonical()) {
1848 // Reverse edges one more time...
1849 tst = _gvn.transform( tst->as_Bool()->negate(&_gvn) );
1850 btest = tst->as_Bool()->_test._test;
1851 assert(BoolTest(btest).is_canonical(), "sanity");
1852 taken_if_true = !taken_if_true;
1853 }
1854 c = tst->in(1);
1855 }
1856 BoolTest::mask neg_btest = BoolTest(btest).negate();
1857 taken_btest = taken_if_true ? btest : neg_btest;
1858 untaken_btest = taken_if_true ? neg_btest : btest;
1859 }
1860
1861 // Generate real control flow
1862 float true_prob = (taken_if_true ? prob : untaken_prob);
1863 IfNode* iff = create_and_map_if(control(), tst, true_prob, cnt);
1864 assert(iff->_prob > 0.0f,"Optimizer made bad probability in parser");
1865 Node* taken_branch = new IfTrueNode(iff);
1866 Node* untaken_branch = new IfFalseNode(iff);
1867 if (!taken_if_true) { // Finish conversion to canonical form
1868 Node* tmp = taken_branch;
1869 taken_branch = untaken_branch;
1870 untaken_branch = tmp;
1871 }
1872
1873 // Branch is taken:
1874 { PreserveJVMState pjvms(this);
1875 taken_branch = _gvn.transform(taken_branch);
1876 set_control(taken_branch);
1877
1878 if (stopped()) {
1879 if (C->eliminate_boxing() && !new_path) {
1880 // Mark the successor block as parsed (if we haven't created a new path)
1881 branch_block->next_path_num();
1882 }
1883 } else {
1884 adjust_map_after_if(taken_btest, c, prob, branch_block);
1885 if (!stopped()) {
1886 if (new_path) {
1887 // Merge by using a new path
1888 merge_new_path(target_bci);
1889 } else if (ctrl_taken != nullptr) {
1890 // Don't merge but save taken branch to be wired by caller
1891 *ctrl_taken = control();
1892 } else {
1893 merge(target_bci);
1894 }
1895 }
1896 }
1897 }
1898
1899 untaken_branch = _gvn.transform(untaken_branch);
1900 set_control(untaken_branch);
1901
1902 // Branch not taken.
1903 if (stopped() && ctrl_taken == nullptr) {
1904 if (C->eliminate_boxing()) {
1905 // Mark the successor block as parsed (if caller does not re-wire control flow)
1906 next_block->next_path_num();
1907 }
1908 } else {
1909 adjust_map_after_if(untaken_btest, c, untaken_prob, next_block);
1910 }
1911 }
1912
1913
1914 static ProfilePtrKind speculative_ptr_kind(const TypeOopPtr* t) {
1915 if (t->speculative() == nullptr) {
1916 return ProfileUnknownNull;
1917 }
1918 if (t->speculative_always_null()) {
1919 return ProfileAlwaysNull;
1920 }
1921 if (t->speculative_maybe_null()) {
1922 return ProfileMaybeNull;
1923 }
1924 return ProfileNeverNull;
1925 }
1926
1927 void Parse::acmp_always_null_input(Node* input, const TypeOopPtr* tinput, BoolTest::mask btest, Node* eq_region) {
1928 inc_sp(2);
1929 Node* cast = null_check_common(input, T_OBJECT, true, nullptr,
1930 !too_many_traps_or_recompiles(Deoptimization::Reason_speculate_null_check) &&
1931 speculative_ptr_kind(tinput) == ProfileAlwaysNull);
1932 dec_sp(2);
1933 if (btest == BoolTest::ne) {
1934 {
1935 PreserveJVMState pjvms(this);
1936 replace_in_map(input, cast);
1937 int target_bci = iter().get_dest();
1938 merge(target_bci);
1939 }
1940 record_for_igvn(eq_region);
1941 set_control(_gvn.transform(eq_region));
1942 } else {
1943 replace_in_map(input, cast);
1944 }
1945 }
1946
1947 Node* Parse::acmp_null_check(Node* input, const TypeOopPtr* tinput, ProfilePtrKind input_ptr, Node*& null_ctl) {
1948 inc_sp(2);
1949 null_ctl = top();
1950 Node* cast = null_check_oop(input, &null_ctl,
1951 input_ptr == ProfileNeverNull || (input_ptr == ProfileUnknownNull && !too_many_traps_or_recompiles(Deoptimization::Reason_null_check)),
1952 false,
1953 speculative_ptr_kind(tinput) == ProfileNeverNull &&
1954 !too_many_traps_or_recompiles(Deoptimization::Reason_speculate_null_check));
1955 dec_sp(2);
1956 assert(!stopped(), "null input should have been caught earlier");
1957 return cast;
1958 }
1959
1960 void Parse::acmp_known_non_inline_type_input(Node* input, const TypeOopPtr* tinput, ProfilePtrKind input_ptr, ciKlass* input_type, BoolTest::mask btest, Node* eq_region) {
1961 Node* ne_region = new RegionNode(1);
1962 Node* null_ctl;
1963 Node* cast = acmp_null_check(input, tinput, input_ptr, null_ctl);
1964 ne_region->add_req(null_ctl);
1965
1966 Node* slow_ctl = type_check_receiver(cast, input_type, 1.0, &cast);
1967 {
1968 PreserveJVMState pjvms(this);
1969 inc_sp(2);
1970 set_control(slow_ctl);
1971 Deoptimization::DeoptReason reason;
1972 if (tinput->speculative_type() != nullptr && !too_many_traps_or_recompiles(Deoptimization::Reason_speculate_class_check)) {
1973 reason = Deoptimization::Reason_speculate_class_check;
1974 } else {
1975 reason = Deoptimization::Reason_class_check;
1976 }
1977 uncommon_trap_exact(reason, Deoptimization::Action_maybe_recompile);
1978 }
1979 ne_region->add_req(control());
1980
1981 record_for_igvn(ne_region);
1982 set_control(_gvn.transform(ne_region));
1983 if (btest == BoolTest::ne) {
1984 {
1985 PreserveJVMState pjvms(this);
1986 if (null_ctl == top()) {
1987 replace_in_map(input, cast);
1988 }
1989 int target_bci = iter().get_dest();
1990 merge(target_bci);
1991 }
1992 record_for_igvn(eq_region);
1993 set_control(_gvn.transform(eq_region));
1994 } else {
1995 if (null_ctl == top()) {
1996 replace_in_map(input, cast);
1997 }
1998 set_control(_gvn.transform(ne_region));
1999 }
2000 }
2001
2002 void Parse::acmp_unknown_non_inline_type_input(Node* input, const TypeOopPtr* tinput, ProfilePtrKind input_ptr, BoolTest::mask btest, Node* eq_region) {
2003 Node* ne_region = new RegionNode(1);
2004 Node* null_ctl;
2005 Node* cast = acmp_null_check(input, tinput, input_ptr, null_ctl);
2006 ne_region->add_req(null_ctl);
2007
2008 {
2009 BuildCutout unless(this, inline_type_test(cast, /* is_inline = */ false), PROB_MAX);
2010 inc_sp(2);
2011 uncommon_trap_exact(Deoptimization::Reason_class_check, Deoptimization::Action_maybe_recompile);
2012 }
2013
2014 ne_region->add_req(control());
2015
2016 record_for_igvn(ne_region);
2017 set_control(_gvn.transform(ne_region));
2018 if (btest == BoolTest::ne) {
2019 {
2020 PreserveJVMState pjvms(this);
2021 if (null_ctl == top()) {
2022 replace_in_map(input, cast);
2023 }
2024 int target_bci = iter().get_dest();
2025 merge(target_bci);
2026 }
2027 record_for_igvn(eq_region);
2028 set_control(_gvn.transform(eq_region));
2029 } else {
2030 if (null_ctl == top()) {
2031 replace_in_map(input, cast);
2032 }
2033 set_control(_gvn.transform(ne_region));
2034 }
2035 }
2036
2037 void Parse::do_acmp(BoolTest::mask btest, Node* left, Node* right) {
2038 ciKlass* left_type = nullptr;
2039 ciKlass* right_type = nullptr;
2040 ProfilePtrKind left_ptr = ProfileUnknownNull;
2041 ProfilePtrKind right_ptr = ProfileUnknownNull;
2042 bool left_inline_type = true;
2043 bool right_inline_type = true;
2044
2045 // Leverage profiling at acmp
2046 if (UseACmpProfile) {
2047 method()->acmp_profiled_type(bci(), left_type, right_type, left_ptr, right_ptr, left_inline_type, right_inline_type);
2048 if (too_many_traps_or_recompiles(Deoptimization::Reason_class_check)) {
2049 left_type = nullptr;
2050 right_type = nullptr;
2051 left_inline_type = true;
2052 right_inline_type = true;
2053 }
2054 if (too_many_traps_or_recompiles(Deoptimization::Reason_null_check)) {
2055 left_ptr = ProfileUnknownNull;
2056 right_ptr = ProfileUnknownNull;
2057 }
2058 }
2059
2060 if (UseTypeSpeculation) {
2061 record_profile_for_speculation(left, left_type, left_ptr);
2062 record_profile_for_speculation(right, right_type, right_ptr);
2063 }
2064
2065 if (!EnableValhalla) {
2066 Node* cmp = CmpP(left, right);
2067 cmp = optimize_cmp_with_klass(cmp);
2068 do_if(btest, cmp);
2069 return;
2070 }
2071
2072 // Check for equality before potentially allocating
2073 if (left == right) {
2074 do_if(btest, makecon(TypeInt::CC_EQ));
2075 return;
2076 }
2077
2078 // Allocate inline type operands and re-execute on deoptimization
2079 if (left->is_InlineType()) {
2080 if (_gvn.type(right)->is_zero_type() ||
2081 (right->is_InlineType() && _gvn.type(right->as_InlineType()->get_is_init())->is_zero_type())) {
2082 // Null checking a scalarized but nullable inline type. Check the IsInit
2083 // input instead of the oop input to avoid keeping buffer allocations alive.
2084 Node* cmp = CmpI(left->as_InlineType()->get_is_init(), intcon(0));
2085 do_if(btest, cmp);
2086 return;
2087 } else {
2088 PreserveReexecuteState preexecs(this);
2089 inc_sp(2);
2090 jvms()->set_should_reexecute(true);
2091 left = left->as_InlineType()->buffer(this)->get_oop();
2092 }
2093 }
2094 if (right->is_InlineType()) {
2095 PreserveReexecuteState preexecs(this);
2096 inc_sp(2);
2097 jvms()->set_should_reexecute(true);
2098 right = right->as_InlineType()->buffer(this)->get_oop();
2099 }
2100
2101 // First, do a normal pointer comparison
2102 const TypeOopPtr* tleft = _gvn.type(left)->isa_oopptr();
2103 const TypeOopPtr* tright = _gvn.type(right)->isa_oopptr();
2104 Node* cmp = CmpP(left, right);
2105 cmp = optimize_cmp_with_klass(cmp);
2106 if (tleft == nullptr || !tleft->can_be_inline_type() ||
2107 tright == nullptr || !tright->can_be_inline_type()) {
2108 // This is sufficient, if one of the operands can't be an inline type
2109 do_if(btest, cmp);
2110 return;
2111 }
2112 Node* eq_region = nullptr;
2113 if (btest == BoolTest::eq) {
2114 do_if(btest, cmp, true);
2115 if (stopped()) {
2116 return;
2117 }
2118 } else {
2119 assert(btest == BoolTest::ne, "only eq or ne");
2120 Node* is_not_equal = nullptr;
2121 eq_region = new RegionNode(3);
2122 {
2123 PreserveJVMState pjvms(this);
2124 do_if(btest, cmp, false, &is_not_equal);
2125 if (!stopped()) {
2126 eq_region->init_req(1, control());
2127 }
2128 }
2129 if (is_not_equal == nullptr || is_not_equal->is_top()) {
2130 record_for_igvn(eq_region);
2131 set_control(_gvn.transform(eq_region));
2132 return;
2133 }
2134 set_control(is_not_equal);
2135 }
2136
2137 // Prefer speculative types if available
2138 if (!too_many_traps_or_recompiles(Deoptimization::Reason_speculate_class_check)) {
2139 if (tleft->speculative_type() != nullptr) {
2140 left_type = tleft->speculative_type();
2141 }
2142 if (tright->speculative_type() != nullptr) {
2143 right_type = tright->speculative_type();
2144 }
2145 }
2146
2147 if (speculative_ptr_kind(tleft) != ProfileMaybeNull && speculative_ptr_kind(tleft) != ProfileUnknownNull) {
2148 ProfilePtrKind speculative_left_ptr = speculative_ptr_kind(tleft);
2149 if (speculative_left_ptr == ProfileAlwaysNull && !too_many_traps_or_recompiles(Deoptimization::Reason_speculate_null_assert)) {
2150 left_ptr = speculative_left_ptr;
2151 } else if (speculative_left_ptr == ProfileNeverNull && !too_many_traps_or_recompiles(Deoptimization::Reason_speculate_null_check)) {
2152 left_ptr = speculative_left_ptr;
2153 }
2154 }
2155 if (speculative_ptr_kind(tright) != ProfileMaybeNull && speculative_ptr_kind(tright) != ProfileUnknownNull) {
2156 ProfilePtrKind speculative_right_ptr = speculative_ptr_kind(tright);
2157 if (speculative_right_ptr == ProfileAlwaysNull && !too_many_traps_or_recompiles(Deoptimization::Reason_speculate_null_assert)) {
2158 right_ptr = speculative_right_ptr;
2159 } else if (speculative_right_ptr == ProfileNeverNull && !too_many_traps_or_recompiles(Deoptimization::Reason_speculate_null_check)) {
2160 right_ptr = speculative_right_ptr;
2161 }
2162 }
2163
2164 if (left_ptr == ProfileAlwaysNull) {
2165 // Comparison with null. Assert the input is indeed null and we're done.
2166 acmp_always_null_input(left, tleft, btest, eq_region);
2167 return;
2168 }
2169 if (right_ptr == ProfileAlwaysNull) {
2170 // Comparison with null. Assert the input is indeed null and we're done.
2171 acmp_always_null_input(right, tright, btest, eq_region);
2172 return;
2173 }
2174 if (left_type != nullptr && !left_type->is_inlinetype()) {
2175 // Comparison with an object of known type
2176 acmp_known_non_inline_type_input(left, tleft, left_ptr, left_type, btest, eq_region);
2177 return;
2178 }
2179 if (right_type != nullptr && !right_type->is_inlinetype()) {
2180 // Comparison with an object of known type
2181 acmp_known_non_inline_type_input(right, tright, right_ptr, right_type, btest, eq_region);
2182 return;
2183 }
2184 if (!left_inline_type) {
2185 // Comparison with an object known not to be an inline type
2186 acmp_unknown_non_inline_type_input(left, tleft, left_ptr, btest, eq_region);
2187 return;
2188 }
2189 if (!right_inline_type) {
2190 // Comparison with an object known not to be an inline type
2191 acmp_unknown_non_inline_type_input(right, tright, right_ptr, btest, eq_region);
2192 return;
2193 }
2194
2195 // Pointers are not equal, check if first operand is non-null
2196 Node* ne_region = new RegionNode(6);
2197 Node* null_ctl;
2198 Node* not_null_right = acmp_null_check(right, tright, right_ptr, null_ctl);
2199 ne_region->init_req(1, null_ctl);
2200
2201 // First operand is non-null, check if it is an inline type
2202 Node* is_value = inline_type_test(not_null_right);
2203 IfNode* is_value_iff = create_and_map_if(control(), is_value, PROB_FAIR, COUNT_UNKNOWN);
2204 Node* not_value = _gvn.transform(new IfFalseNode(is_value_iff));
2205 ne_region->init_req(2, not_value);
2206 set_control(_gvn.transform(new IfTrueNode(is_value_iff)));
2207
2208 // The first operand is an inline type, check if the second operand is non-null
2209 Node* not_null_left = acmp_null_check(left, tleft, left_ptr, null_ctl);
2210 ne_region->init_req(3, null_ctl);
2211
2212 // Check if both operands are of the same class.
2213 Node* kls_left = load_object_klass(not_null_left);
2214 Node* kls_right = load_object_klass(not_null_right);
2215 Node* kls_cmp = CmpP(kls_left, kls_right);
2216 Node* kls_bol = _gvn.transform(new BoolNode(kls_cmp, BoolTest::ne));
2217 IfNode* kls_iff = create_and_map_if(control(), kls_bol, PROB_FAIR, COUNT_UNKNOWN);
2218 Node* kls_ne = _gvn.transform(new IfTrueNode(kls_iff));
2219 set_control(_gvn.transform(new IfFalseNode(kls_iff)));
2220 ne_region->init_req(4, kls_ne);
2221
2222 if (stopped()) {
2223 record_for_igvn(ne_region);
2224 set_control(_gvn.transform(ne_region));
2225 if (btest == BoolTest::ne) {
2226 {
2227 PreserveJVMState pjvms(this);
2228 int target_bci = iter().get_dest();
2229 merge(target_bci);
2230 }
2231 record_for_igvn(eq_region);
2232 set_control(_gvn.transform(eq_region));
2233 }
2234 return;
2235 }
2236
2237 // Both operands are values types of the same class, we need to perform a
2238 // substitutability test. Delegate to ValueObjectMethods::isSubstitutable().
2239 Node* ne_io_phi = PhiNode::make(ne_region, i_o());
2240 Node* mem = reset_memory();
2241 Node* ne_mem_phi = PhiNode::make(ne_region, mem);
2242
2243 Node* eq_io_phi = nullptr;
2244 Node* eq_mem_phi = nullptr;
2245 if (eq_region != nullptr) {
2246 eq_io_phi = PhiNode::make(eq_region, i_o());
2247 eq_mem_phi = PhiNode::make(eq_region, mem);
2248 }
2249
2250 set_all_memory(mem);
2251
2252 kill_dead_locals();
2253 ciMethod* subst_method = ciEnv::current()->ValueObjectMethods_klass()->find_method(ciSymbols::isSubstitutable_name(), ciSymbols::object_object_boolean_signature());
2254 CallStaticJavaNode *call = new CallStaticJavaNode(C, TypeFunc::make(subst_method), SharedRuntime::get_resolve_static_call_stub(), subst_method);
2255 call->set_override_symbolic_info(true);
2256 call->init_req(TypeFunc::Parms, not_null_left);
2257 call->init_req(TypeFunc::Parms+1, not_null_right);
2258 inc_sp(2);
2259 set_edges_for_java_call(call, false, false);
2260 Node* ret = set_results_for_java_call(call, false, true);
2261 dec_sp(2);
2262
2263 // Test the return value of ValueObjectMethods::isSubstitutable()
2264 Node* subst_cmp = _gvn.transform(new CmpINode(ret, intcon(1)));
2265 Node* ctl = C->top();
2266 if (btest == BoolTest::eq) {
2267 PreserveJVMState pjvms(this);
2268 do_if(btest, subst_cmp);
2269 if (!stopped()) {
2270 ctl = control();
2271 }
2272 } else {
2273 assert(btest == BoolTest::ne, "only eq or ne");
2274 PreserveJVMState pjvms(this);
2275 do_if(btest, subst_cmp, false, &ctl);
2276 if (!stopped()) {
2277 eq_region->init_req(2, control());
2278 eq_io_phi->init_req(2, i_o());
2279 eq_mem_phi->init_req(2, reset_memory());
2280 }
2281 }
2282 ne_region->init_req(5, ctl);
2283 ne_io_phi->init_req(5, i_o());
2284 ne_mem_phi->init_req(5, reset_memory());
2285
2286 record_for_igvn(ne_region);
2287 set_control(_gvn.transform(ne_region));
2288 set_i_o(_gvn.transform(ne_io_phi));
2289 set_all_memory(_gvn.transform(ne_mem_phi));
2290
2291 if (btest == BoolTest::ne) {
2292 {
2293 PreserveJVMState pjvms(this);
2294 int target_bci = iter().get_dest();
2295 merge(target_bci);
2296 }
2297
2298 record_for_igvn(eq_region);
2299 set_control(_gvn.transform(eq_region));
2300 set_i_o(_gvn.transform(eq_io_phi));
2301 set_all_memory(_gvn.transform(eq_mem_phi));
2302 }
2303 }
2304
2305 bool Parse::path_is_suitable_for_uncommon_trap(float prob) const {
2306 // Don't want to speculate on uncommon traps when running with -Xcomp
2307 if (!UseInterpreter) {
2308 return false;
2309 }
2310 return (seems_never_taken(prob) && seems_stable_comparison());
2311 }
2312
2313 void Parse::maybe_add_predicate_after_if(Block* path) {
2314 if (path->is_SEL_head() && path->preds_parsed() == 0) {
2315 // Add predicates at bci of if dominating the loop so traps can be
2316 // recorded on the if's profile data
2317 int bc_depth = repush_if_args();
2318 add_parse_predicates();
2319 dec_sp(bc_depth);
2320 path->set_has_predicates();
2321 }
2322 }
2323
2324
2325 //----------------------------adjust_map_after_if------------------------------
2326 // Adjust the JVM state to reflect the result of taking this path.
2327 // Basically, it means inspecting the CmpNode controlling this
2328 // branch, seeing how it constrains a tested value, and then
2329 // deciding if it's worth our while to encode this constraint
2330 // as graph nodes in the current abstract interpretation map.
2331 void Parse::adjust_map_after_if(BoolTest::mask btest, Node* c, float prob, Block* path) {
2332 if (!c->is_Cmp()) {
2333 maybe_add_predicate_after_if(path);
2334 return;
2335 }
2336
2337 if (stopped() || btest == BoolTest::illegal) {
2338 return; // nothing to do
2339 }
2340
2341 bool is_fallthrough = (path == successor_for_bci(iter().next_bci()));
2342
2343 if (path_is_suitable_for_uncommon_trap(prob)) {
2344 repush_if_args();
2345 Node* call = uncommon_trap(Deoptimization::Reason_unstable_if,
2346 Deoptimization::Action_reinterpret,
2347 nullptr,
2348 (is_fallthrough ? "taken always" : "taken never"));
2349
2350 if (call != nullptr) {
2351 C->record_unstable_if_trap(new UnstableIfTrap(call->as_CallStaticJava(), path));
2352 }
2353 return;
2354 }
2355
2356 Node* val = c->in(1);
2357 Node* con = c->in(2);
2358 const Type* tcon = _gvn.type(con);
2359 const Type* tval = _gvn.type(val);
2360 bool have_con = tcon->singleton();
2361 if (tval->singleton()) {
2362 if (!have_con) {
2363 // Swap, so constant is in con.
2364 con = val;
2365 tcon = tval;
2366 val = c->in(2);
2367 tval = _gvn.type(val);
2368 btest = BoolTest(btest).commute();
2369 have_con = true;
2370 } else {
2371 // Do we have two constants? Then leave well enough alone.
2372 have_con = false;
2373 }
2374 }
2375 if (!have_con) { // remaining adjustments need a con
2376 maybe_add_predicate_after_if(path);
2377 return;
2378 }
2379
2380 sharpen_type_after_if(btest, con, tcon, val, tval);
2381 maybe_add_predicate_after_if(path);
2382 }
2383
2384
2385 static Node* extract_obj_from_klass_load(PhaseGVN* gvn, Node* n) {
2386 Node* ldk;
2387 if (n->is_DecodeNKlass()) {
2388 if (n->in(1)->Opcode() != Op_LoadNKlass) {
2389 return nullptr;
2390 } else {
2391 ldk = n->in(1);
2392 }
2393 } else if (n->Opcode() != Op_LoadKlass) {
2394 return nullptr;
2395 } else {
2396 ldk = n;
2397 }
2398 assert(ldk != nullptr && ldk->is_Load(), "should have found a LoadKlass or LoadNKlass node");
2399
2400 Node* adr = ldk->in(MemNode::Address);
2401 intptr_t off = 0;
2402 Node* obj = AddPNode::Ideal_base_and_offset(adr, gvn, off);
2403 if (obj == nullptr || off != oopDesc::klass_offset_in_bytes()) // loading oopDesc::_klass?
2404 return nullptr;
2405 const TypePtr* tp = gvn->type(obj)->is_ptr();
2406 if (tp == nullptr || !(tp->isa_instptr() || tp->isa_aryptr())) // is obj a Java object ptr?
2407 return nullptr;
2408
2409 return obj;
2410 }
2411
2412 void Parse::sharpen_type_after_if(BoolTest::mask btest,
2413 Node* con, const Type* tcon,
2414 Node* val, const Type* tval) {
2415 // Look for opportunities to sharpen the type of a node
2416 // whose klass is compared with a constant klass.
2417 if (btest == BoolTest::eq && tcon->isa_klassptr()) {
2418 Node* obj = extract_obj_from_klass_load(&_gvn, val);
2419 const TypeOopPtr* con_type = tcon->isa_klassptr()->as_instance_type();
2420 if (obj != nullptr && (con_type->isa_instptr() || con_type->isa_aryptr())) {
2421 // Found:
2422 // Bool(CmpP(LoadKlass(obj._klass), ConP(Foo.klass)), [eq])
2423 // or the narrowOop equivalent.
2424 const Type* obj_type = _gvn.type(obj);
2425 const TypeOopPtr* tboth = obj_type->join_speculative(con_type)->isa_oopptr();
2426 if (tboth != nullptr && tboth->klass_is_exact() && tboth != obj_type &&
2427 tboth->higher_equal(obj_type)) {
2428 // obj has to be of the exact type Foo if the CmpP succeeds.
2429 int obj_in_map = map()->find_edge(obj);
2430 JVMState* jvms = this->jvms();
2431 if (obj_in_map >= 0 &&
2432 (jvms->is_loc(obj_in_map) || jvms->is_stk(obj_in_map))) {
2433 TypeNode* ccast = new CheckCastPPNode(control(), obj, tboth);
2434 const Type* tcc = ccast->as_Type()->type();
2435 assert(tcc != obj_type && tcc->higher_equal(obj_type), "must improve");
2436 // Delay transform() call to allow recovery of pre-cast value
2437 // at the control merge.
2438 _gvn.set_type_bottom(ccast);
2439 record_for_igvn(ccast);
2440 if (tboth->is_inlinetypeptr()) {
2441 ccast = InlineTypeNode::make_from_oop(this, ccast, tboth->exact_klass(true)->as_inline_klass());
2442 }
2443 // Here's the payoff.
2444 replace_in_map(obj, ccast);
2445 }
2446 }
2447 }
2448 }
2449
2450 int val_in_map = map()->find_edge(val);
2451 if (val_in_map < 0) return; // replace_in_map would be useless
2452 {
2453 JVMState* jvms = this->jvms();
2454 if (!(jvms->is_loc(val_in_map) ||
2455 jvms->is_stk(val_in_map)))
2456 return; // again, it would be useless
2457 }
2458
2459 // Check for a comparison to a constant, and "know" that the compared
2460 // value is constrained on this path.
2461 assert(tcon->singleton(), "");
2462 ConstraintCastNode* ccast = nullptr;
2463 Node* cast = nullptr;
2464
2465 switch (btest) {
2466 case BoolTest::eq: // Constant test?
2467 {
2468 const Type* tboth = tcon->join_speculative(tval);
2469 if (tboth == tval) break; // Nothing to gain.
2470 if (tcon->isa_int()) {
2471 ccast = new CastIINode(val, tboth);
2472 } else if (tcon == TypePtr::NULL_PTR) {
2473 // Cast to null, but keep the pointer identity temporarily live.
2474 ccast = new CastPPNode(val, tboth);
2475 } else {
2476 const TypeF* tf = tcon->isa_float_constant();
2477 const TypeD* td = tcon->isa_double_constant();
2478 // Exclude tests vs float/double 0 as these could be
2479 // either +0 or -0. Just because you are equal to +0
2480 // doesn't mean you ARE +0!
2481 // Note, following code also replaces Long and Oop values.
2482 if ((!tf || tf->_f != 0.0) &&
2483 (!td || td->_d != 0.0))
2484 cast = con; // Replace non-constant val by con.
2485 }
2486 }
2487 break;
2488
2489 case BoolTest::ne:
2490 if (tcon == TypePtr::NULL_PTR) {
2491 cast = cast_not_null(val, false);
2492 }
2493 break;
2494
2495 default:
2496 // (At this point we could record int range types with CastII.)
2497 break;
2498 }
2499
2500 if (ccast != nullptr) {
2501 const Type* tcc = ccast->as_Type()->type();
2502 assert(tcc != tval && tcc->higher_equal(tval), "must improve");
2503 // Delay transform() call to allow recovery of pre-cast value
2504 // at the control merge.
2505 ccast->set_req(0, control());
2506 _gvn.set_type_bottom(ccast);
2507 record_for_igvn(ccast);
2508 cast = ccast;
2509 }
2510
2511 if (cast != nullptr) { // Here's the payoff.
2512 replace_in_map(val, cast);
2513 }
2514 }
2515
2516 /**
2517 * Use speculative type to optimize CmpP node: if comparison is
2518 * against the low level class, cast the object to the speculative
2519 * type if any. CmpP should then go away.
2520 *
2521 * @param c expected CmpP node
2522 * @return result of CmpP on object casted to speculative type
2523 *
2524 */
2525 Node* Parse::optimize_cmp_with_klass(Node* c) {
2526 // If this is transformed by the _gvn to a comparison with the low
2527 // level klass then we may be able to use speculation
2528 if (c->Opcode() == Op_CmpP &&
2529 (c->in(1)->Opcode() == Op_LoadKlass || c->in(1)->Opcode() == Op_DecodeNKlass) &&
2530 c->in(2)->is_Con()) {
2531 Node* load_klass = nullptr;
2532 Node* decode = nullptr;
2533 if (c->in(1)->Opcode() == Op_DecodeNKlass) {
2534 decode = c->in(1);
2535 load_klass = c->in(1)->in(1);
2536 } else {
2537 load_klass = c->in(1);
2538 }
2539 if (load_klass->in(2)->is_AddP()) {
2540 Node* addp = load_klass->in(2);
2541 Node* obj = addp->in(AddPNode::Address);
2542 const TypeOopPtr* obj_type = _gvn.type(obj)->is_oopptr();
2543 if (obj_type->speculative_type_not_null() != nullptr) {
2544 ciKlass* k = obj_type->speculative_type();
2545 inc_sp(2);
2546 obj = maybe_cast_profiled_obj(obj, k);
2547 dec_sp(2);
2548 if (obj->is_InlineType()) {
2549 assert(obj->as_InlineType()->is_allocated(&_gvn), "must be allocated");
2550 obj = obj->as_InlineType()->get_oop();
2551 }
2552 // Make the CmpP use the casted obj
2553 addp = basic_plus_adr(obj, addp->in(AddPNode::Offset));
2554 load_klass = load_klass->clone();
2555 load_klass->set_req(2, addp);
2556 load_klass = _gvn.transform(load_klass);
2557 if (decode != nullptr) {
2558 decode = decode->clone();
2559 decode->set_req(1, load_klass);
2560 load_klass = _gvn.transform(decode);
2561 }
2562 c = c->clone();
2563 c->set_req(1, load_klass);
2564 c = _gvn.transform(c);
2565 }
2566 }
2567 }
2568 return c;
2569 }
2570
2571 //------------------------------do_one_bytecode--------------------------------
2572 // Parse this bytecode, and alter the Parsers JVM->Node mapping
2573 void Parse::do_one_bytecode() {
2574 Node *a, *b, *c, *d; // Handy temps
2575 BoolTest::mask btest;
2576 int i;
2577
2578 assert(!has_exceptions(), "bytecode entry state must be clear of throws");
2579
2580 if (C->check_node_count(NodeLimitFudgeFactor * 5,
2581 "out of nodes parsing method")) {
2582 return;
2583 }
2584
2585 #ifdef ASSERT
2586 // for setting breakpoints
2587 if (TraceOptoParse) {
2588 tty->print(" @");
2589 dump_bci(bci());
2590 tty->print(" %s", Bytecodes::name(bc()));
2591 tty->cr();
2592 }
2593 #endif
2594
2595 switch (bc()) {
2596 case Bytecodes::_nop:
2597 // do nothing
2598 break;
2599 case Bytecodes::_lconst_0:
2600 push_pair(longcon(0));
2601 break;
2602
2603 case Bytecodes::_lconst_1:
2604 push_pair(longcon(1));
2605 break;
2606
2607 case Bytecodes::_fconst_0:
2608 push(zerocon(T_FLOAT));
2609 break;
2610
2611 case Bytecodes::_fconst_1:
2612 push(makecon(TypeF::ONE));
2613 break;
2614
2615 case Bytecodes::_fconst_2:
2616 push(makecon(TypeF::make(2.0f)));
2617 break;
2618
2619 case Bytecodes::_dconst_0:
2620 push_pair(zerocon(T_DOUBLE));
2621 break;
2622
2623 case Bytecodes::_dconst_1:
2624 push_pair(makecon(TypeD::ONE));
2625 break;
2626
2627 case Bytecodes::_iconst_m1:push(intcon(-1)); break;
2628 case Bytecodes::_iconst_0: push(intcon( 0)); break;
2629 case Bytecodes::_iconst_1: push(intcon( 1)); break;
2630 case Bytecodes::_iconst_2: push(intcon( 2)); break;
2631 case Bytecodes::_iconst_3: push(intcon( 3)); break;
2632 case Bytecodes::_iconst_4: push(intcon( 4)); break;
2633 case Bytecodes::_iconst_5: push(intcon( 5)); break;
2634 case Bytecodes::_bipush: push(intcon(iter().get_constant_u1())); break;
2635 case Bytecodes::_sipush: push(intcon(iter().get_constant_u2())); break;
2636 case Bytecodes::_aconst_null: push(null()); break;
2637
2638 case Bytecodes::_ldc:
2639 case Bytecodes::_ldc_w:
2640 case Bytecodes::_ldc2_w: {
2641 ciConstant constant = iter().get_constant();
2642 if (constant.is_loaded()) {
2643 const Type* con_type = Type::make_from_constant(constant);
2644 if (con_type != nullptr) {
2645 push_node(con_type->basic_type(), makecon(con_type));
2646 }
2647 } else {
2648 // If the constant is unresolved or in error state, run this BC in the interpreter.
2649 if (iter().is_in_error()) {
2650 uncommon_trap(Deoptimization::make_trap_request(Deoptimization::Reason_unhandled,
2651 Deoptimization::Action_none),
2652 nullptr, "constant in error state", true /* must_throw */);
2653
2654 } else {
2655 int index = iter().get_constant_pool_index();
2656 uncommon_trap(Deoptimization::make_trap_request(Deoptimization::Reason_unloaded,
2657 Deoptimization::Action_reinterpret,
2658 index),
2659 nullptr, "unresolved constant", false /* must_throw */);
2660 }
2661 }
2662 break;
2663 }
2664
2665 case Bytecodes::_aload_0:
2666 push( local(0) );
2667 break;
2668 case Bytecodes::_aload_1:
2669 push( local(1) );
2670 break;
2671 case Bytecodes::_aload_2:
2672 push( local(2) );
2673 break;
2674 case Bytecodes::_aload_3:
2675 push( local(3) );
2676 break;
2677 case Bytecodes::_aload:
2678 push( local(iter().get_index()) );
2679 break;
2680
2681 case Bytecodes::_fload_0:
2682 case Bytecodes::_iload_0:
2683 push( local(0) );
2684 break;
2685 case Bytecodes::_fload_1:
2686 case Bytecodes::_iload_1:
2687 push( local(1) );
2688 break;
2689 case Bytecodes::_fload_2:
2690 case Bytecodes::_iload_2:
2691 push( local(2) );
2692 break;
2693 case Bytecodes::_fload_3:
2694 case Bytecodes::_iload_3:
2695 push( local(3) );
2696 break;
2697 case Bytecodes::_fload:
2698 case Bytecodes::_iload:
2699 push( local(iter().get_index()) );
2700 break;
2701 case Bytecodes::_lload_0:
2702 push_pair_local( 0 );
2703 break;
2704 case Bytecodes::_lload_1:
2705 push_pair_local( 1 );
2706 break;
2707 case Bytecodes::_lload_2:
2708 push_pair_local( 2 );
2709 break;
2710 case Bytecodes::_lload_3:
2711 push_pair_local( 3 );
2712 break;
2713 case Bytecodes::_lload:
2714 push_pair_local( iter().get_index() );
2715 break;
2716
2717 case Bytecodes::_dload_0:
2718 push_pair_local(0);
2719 break;
2720 case Bytecodes::_dload_1:
2721 push_pair_local(1);
2722 break;
2723 case Bytecodes::_dload_2:
2724 push_pair_local(2);
2725 break;
2726 case Bytecodes::_dload_3:
2727 push_pair_local(3);
2728 break;
2729 case Bytecodes::_dload:
2730 push_pair_local(iter().get_index());
2731 break;
2732 case Bytecodes::_fstore_0:
2733 case Bytecodes::_istore_0:
2734 case Bytecodes::_astore_0:
2735 set_local( 0, pop() );
2736 break;
2737 case Bytecodes::_fstore_1:
2738 case Bytecodes::_istore_1:
2739 case Bytecodes::_astore_1:
2740 set_local( 1, pop() );
2741 break;
2742 case Bytecodes::_fstore_2:
2743 case Bytecodes::_istore_2:
2744 case Bytecodes::_astore_2:
2745 set_local( 2, pop() );
2746 break;
2747 case Bytecodes::_fstore_3:
2748 case Bytecodes::_istore_3:
2749 case Bytecodes::_astore_3:
2750 set_local( 3, pop() );
2751 break;
2752 case Bytecodes::_fstore:
2753 case Bytecodes::_istore:
2754 case Bytecodes::_astore:
2755 set_local( iter().get_index(), pop() );
2756 break;
2757 // long stores
2758 case Bytecodes::_lstore_0:
2759 set_pair_local( 0, pop_pair() );
2760 break;
2761 case Bytecodes::_lstore_1:
2762 set_pair_local( 1, pop_pair() );
2763 break;
2764 case Bytecodes::_lstore_2:
2765 set_pair_local( 2, pop_pair() );
2766 break;
2767 case Bytecodes::_lstore_3:
2768 set_pair_local( 3, pop_pair() );
2769 break;
2770 case Bytecodes::_lstore:
2771 set_pair_local( iter().get_index(), pop_pair() );
2772 break;
2773
2774 // double stores
2775 case Bytecodes::_dstore_0:
2776 set_pair_local( 0, dprecision_rounding(pop_pair()) );
2777 break;
2778 case Bytecodes::_dstore_1:
2779 set_pair_local( 1, dprecision_rounding(pop_pair()) );
2780 break;
2781 case Bytecodes::_dstore_2:
2782 set_pair_local( 2, dprecision_rounding(pop_pair()) );
2783 break;
2784 case Bytecodes::_dstore_3:
2785 set_pair_local( 3, dprecision_rounding(pop_pair()) );
2786 break;
2787 case Bytecodes::_dstore:
2788 set_pair_local( iter().get_index(), dprecision_rounding(pop_pair()) );
2789 break;
2790
2791 case Bytecodes::_pop: dec_sp(1); break;
2792 case Bytecodes::_pop2: dec_sp(2); break;
2793 case Bytecodes::_swap:
2794 a = pop();
2795 b = pop();
2796 push(a);
2797 push(b);
2798 break;
2799 case Bytecodes::_dup:
2800 a = pop();
2801 push(a);
2802 push(a);
2803 break;
2804 case Bytecodes::_dup_x1:
2805 a = pop();
2806 b = pop();
2807 push( a );
2808 push( b );
2809 push( a );
2810 break;
2811 case Bytecodes::_dup_x2:
2812 a = pop();
2813 b = pop();
2814 c = pop();
2815 push( a );
2816 push( c );
2817 push( b );
2818 push( a );
2819 break;
2820 case Bytecodes::_dup2:
2821 a = pop();
2822 b = pop();
2823 push( b );
2824 push( a );
2825 push( b );
2826 push( a );
2827 break;
2828
2829 case Bytecodes::_dup2_x1:
2830 // before: .. c, b, a
2831 // after: .. b, a, c, b, a
2832 // not tested
2833 a = pop();
2834 b = pop();
2835 c = pop();
2836 push( b );
2837 push( a );
2838 push( c );
2839 push( b );
2840 push( a );
2841 break;
2842 case Bytecodes::_dup2_x2:
2843 // before: .. d, c, b, a
2844 // after: .. b, a, d, c, b, a
2845 // not tested
2846 a = pop();
2847 b = pop();
2848 c = pop();
2849 d = pop();
2850 push( b );
2851 push( a );
2852 push( d );
2853 push( c );
2854 push( b );
2855 push( a );
2856 break;
2857
2858 case Bytecodes::_arraylength: {
2859 // Must do null-check with value on expression stack
2860 Node *ary = null_check(peek(), T_ARRAY);
2861 // Compile-time detect of null-exception?
2862 if (stopped()) return;
2863 a = pop();
2864 push(load_array_length(a));
2865 break;
2866 }
2867
2868 case Bytecodes::_baload: array_load(T_BYTE); break;
2869 case Bytecodes::_caload: array_load(T_CHAR); break;
2870 case Bytecodes::_iaload: array_load(T_INT); break;
2871 case Bytecodes::_saload: array_load(T_SHORT); break;
2872 case Bytecodes::_faload: array_load(T_FLOAT); break;
2873 case Bytecodes::_aaload: array_load(T_OBJECT); break;
2874 case Bytecodes::_laload: array_load(T_LONG); break;
2875 case Bytecodes::_daload: array_load(T_DOUBLE); break;
2876 case Bytecodes::_bastore: array_store(T_BYTE); break;
2877 case Bytecodes::_castore: array_store(T_CHAR); break;
2878 case Bytecodes::_iastore: array_store(T_INT); break;
2879 case Bytecodes::_sastore: array_store(T_SHORT); break;
2880 case Bytecodes::_fastore: array_store(T_FLOAT); break;
2881 case Bytecodes::_aastore: array_store(T_OBJECT); break;
2882 case Bytecodes::_lastore: array_store(T_LONG); break;
2883 case Bytecodes::_dastore: array_store(T_DOUBLE); break;
2884
2885 case Bytecodes::_getfield:
2886 do_getfield();
2887 break;
2888
2889 case Bytecodes::_getstatic:
2890 do_getstatic();
2891 break;
2892
2893 case Bytecodes::_putfield:
2894 do_putfield();
2895 break;
2896
2897 case Bytecodes::_putstatic:
2898 do_putstatic();
2899 break;
2900
2901 case Bytecodes::_irem:
2902 // Must keep both values on the expression-stack during null-check
2903 zero_check_int(peek());
2904 // Compile-time detect of null-exception?
2905 if (stopped()) return;
2906 b = pop();
2907 a = pop();
2908 push(_gvn.transform(new ModINode(control(), a, b)));
2909 break;
2910 case Bytecodes::_idiv:
2911 // Must keep both values on the expression-stack during null-check
2912 zero_check_int(peek());
2913 // Compile-time detect of null-exception?
2914 if (stopped()) return;
2915 b = pop();
2916 a = pop();
2917 push( _gvn.transform( new DivINode(control(),a,b) ) );
2918 break;
2919 case Bytecodes::_imul:
2920 b = pop(); a = pop();
2921 push( _gvn.transform( new MulINode(a,b) ) );
2922 break;
2923 case Bytecodes::_iadd:
2924 b = pop(); a = pop();
2925 push( _gvn.transform( new AddINode(a,b) ) );
2926 break;
2927 case Bytecodes::_ineg:
2928 a = pop();
2929 push( _gvn.transform( new SubINode(_gvn.intcon(0),a)) );
2930 break;
2931 case Bytecodes::_isub:
2932 b = pop(); a = pop();
2933 push( _gvn.transform( new SubINode(a,b) ) );
2934 break;
2935 case Bytecodes::_iand:
2936 b = pop(); a = pop();
2937 push( _gvn.transform( new AndINode(a,b) ) );
2938 break;
2939 case Bytecodes::_ior:
2940 b = pop(); a = pop();
2941 push( _gvn.transform( new OrINode(a,b) ) );
2942 break;
2943 case Bytecodes::_ixor:
2944 b = pop(); a = pop();
2945 push( _gvn.transform( new XorINode(a,b) ) );
2946 break;
2947 case Bytecodes::_ishl:
2948 b = pop(); a = pop();
2949 push( _gvn.transform( new LShiftINode(a,b) ) );
2950 break;
2951 case Bytecodes::_ishr:
2952 b = pop(); a = pop();
2953 push( _gvn.transform( new RShiftINode(a,b) ) );
2954 break;
2955 case Bytecodes::_iushr:
2956 b = pop(); a = pop();
2957 push( _gvn.transform( new URShiftINode(a,b) ) );
2958 break;
2959
2960 case Bytecodes::_fneg:
2961 a = pop();
2962 b = _gvn.transform(new NegFNode (a));
2963 push(b);
2964 break;
2965
2966 case Bytecodes::_fsub:
2967 b = pop();
2968 a = pop();
2969 c = _gvn.transform( new SubFNode(a,b) );
2970 d = precision_rounding(c);
2971 push( d );
2972 break;
2973
2974 case Bytecodes::_fadd:
2975 b = pop();
2976 a = pop();
2977 c = _gvn.transform( new AddFNode(a,b) );
2978 d = precision_rounding(c);
2979 push( d );
2980 break;
2981
2982 case Bytecodes::_fmul:
2983 b = pop();
2984 a = pop();
2985 c = _gvn.transform( new MulFNode(a,b) );
2986 d = precision_rounding(c);
2987 push( d );
2988 break;
2989
2990 case Bytecodes::_fdiv:
2991 b = pop();
2992 a = pop();
2993 c = _gvn.transform( new DivFNode(0,a,b) );
2994 d = precision_rounding(c);
2995 push( d );
2996 break;
2997
2998 case Bytecodes::_frem:
2999 if (Matcher::has_match_rule(Op_ModF)) {
3000 // Generate a ModF node.
3001 b = pop();
3002 a = pop();
3003 c = _gvn.transform( new ModFNode(0,a,b) );
3004 d = precision_rounding(c);
3005 push( d );
3006 }
3007 else {
3008 // Generate a call.
3009 modf();
3010 }
3011 break;
3012
3013 case Bytecodes::_fcmpl:
3014 b = pop();
3015 a = pop();
3016 c = _gvn.transform( new CmpF3Node( a, b));
3017 push(c);
3018 break;
3019 case Bytecodes::_fcmpg:
3020 b = pop();
3021 a = pop();
3022
3023 // Same as fcmpl but need to flip the unordered case. Swap the inputs,
3024 // which negates the result sign except for unordered. Flip the unordered
3025 // as well by using CmpF3 which implements unordered-lesser instead of
3026 // unordered-greater semantics. Finally, commute the result bits. Result
3027 // is same as using a CmpF3Greater except we did it with CmpF3 alone.
3028 c = _gvn.transform( new CmpF3Node( b, a));
3029 c = _gvn.transform( new SubINode(_gvn.intcon(0),c) );
3030 push(c);
3031 break;
3032
3033 case Bytecodes::_f2i:
3034 a = pop();
3035 push(_gvn.transform(new ConvF2INode(a)));
3036 break;
3037
3038 case Bytecodes::_d2i:
3039 a = pop_pair();
3040 b = _gvn.transform(new ConvD2INode(a));
3041 push( b );
3042 break;
3043
3044 case Bytecodes::_f2d:
3045 a = pop();
3046 b = _gvn.transform( new ConvF2DNode(a));
3047 push_pair( b );
3048 break;
3049
3050 case Bytecodes::_d2f:
3051 a = pop_pair();
3052 b = _gvn.transform( new ConvD2FNode(a));
3053 // This breaks _227_mtrt (speed & correctness) and _222_mpegaudio (speed)
3054 //b = _gvn.transform(new RoundFloatNode(0, b) );
3055 push( b );
3056 break;
3057
3058 case Bytecodes::_l2f:
3059 if (Matcher::convL2FSupported()) {
3060 a = pop_pair();
3061 b = _gvn.transform( new ConvL2FNode(a));
3062 // For x86_32.ad, FILD doesn't restrict precision to 24 or 53 bits.
3063 // Rather than storing the result into an FP register then pushing
3064 // out to memory to round, the machine instruction that implements
3065 // ConvL2D is responsible for rounding.
3066 // c = precision_rounding(b);
3067 push(b);
3068 } else {
3069 l2f();
3070 }
3071 break;
3072
3073 case Bytecodes::_l2d:
3074 a = pop_pair();
3075 b = _gvn.transform( new ConvL2DNode(a));
3076 // For x86_32.ad, rounding is always necessary (see _l2f above).
3077 // c = dprecision_rounding(b);
3078 push_pair(b);
3079 break;
3080
3081 case Bytecodes::_f2l:
3082 a = pop();
3083 b = _gvn.transform( new ConvF2LNode(a));
3084 push_pair(b);
3085 break;
3086
3087 case Bytecodes::_d2l:
3088 a = pop_pair();
3089 b = _gvn.transform( new ConvD2LNode(a));
3090 push_pair(b);
3091 break;
3092
3093 case Bytecodes::_dsub:
3094 b = pop_pair();
3095 a = pop_pair();
3096 c = _gvn.transform( new SubDNode(a,b) );
3097 d = dprecision_rounding(c);
3098 push_pair( d );
3099 break;
3100
3101 case Bytecodes::_dadd:
3102 b = pop_pair();
3103 a = pop_pair();
3104 c = _gvn.transform( new AddDNode(a,b) );
3105 d = dprecision_rounding(c);
3106 push_pair( d );
3107 break;
3108
3109 case Bytecodes::_dmul:
3110 b = pop_pair();
3111 a = pop_pair();
3112 c = _gvn.transform( new MulDNode(a,b) );
3113 d = dprecision_rounding(c);
3114 push_pair( d );
3115 break;
3116
3117 case Bytecodes::_ddiv:
3118 b = pop_pair();
3119 a = pop_pair();
3120 c = _gvn.transform( new DivDNode(0,a,b) );
3121 d = dprecision_rounding(c);
3122 push_pair( d );
3123 break;
3124
3125 case Bytecodes::_dneg:
3126 a = pop_pair();
3127 b = _gvn.transform(new NegDNode (a));
3128 push_pair(b);
3129 break;
3130
3131 case Bytecodes::_drem:
3132 if (Matcher::has_match_rule(Op_ModD)) {
3133 // Generate a ModD node.
3134 b = pop_pair();
3135 a = pop_pair();
3136 // a % b
3137
3138 c = _gvn.transform( new ModDNode(0,a,b) );
3139 d = dprecision_rounding(c);
3140 push_pair( d );
3141 }
3142 else {
3143 // Generate a call.
3144 modd();
3145 }
3146 break;
3147
3148 case Bytecodes::_dcmpl:
3149 b = pop_pair();
3150 a = pop_pair();
3151 c = _gvn.transform( new CmpD3Node( a, b));
3152 push(c);
3153 break;
3154
3155 case Bytecodes::_dcmpg:
3156 b = pop_pair();
3157 a = pop_pair();
3158 // Same as dcmpl but need to flip the unordered case.
3159 // Commute the inputs, which negates the result sign except for unordered.
3160 // Flip the unordered as well by using CmpD3 which implements
3161 // unordered-lesser instead of unordered-greater semantics.
3162 // Finally, negate the result bits. Result is same as using a
3163 // CmpD3Greater except we did it with CmpD3 alone.
3164 c = _gvn.transform( new CmpD3Node( b, a));
3165 c = _gvn.transform( new SubINode(_gvn.intcon(0),c) );
3166 push(c);
3167 break;
3168
3169
3170 // Note for longs -> lo word is on TOS, hi word is on TOS - 1
3171 case Bytecodes::_land:
3172 b = pop_pair();
3173 a = pop_pair();
3174 c = _gvn.transform( new AndLNode(a,b) );
3175 push_pair(c);
3176 break;
3177 case Bytecodes::_lor:
3178 b = pop_pair();
3179 a = pop_pair();
3180 c = _gvn.transform( new OrLNode(a,b) );
3181 push_pair(c);
3182 break;
3183 case Bytecodes::_lxor:
3184 b = pop_pair();
3185 a = pop_pair();
3186 c = _gvn.transform( new XorLNode(a,b) );
3187 push_pair(c);
3188 break;
3189
3190 case Bytecodes::_lshl:
3191 b = pop(); // the shift count
3192 a = pop_pair(); // value to be shifted
3193 c = _gvn.transform( new LShiftLNode(a,b) );
3194 push_pair(c);
3195 break;
3196 case Bytecodes::_lshr:
3197 b = pop(); // the shift count
3198 a = pop_pair(); // value to be shifted
3199 c = _gvn.transform( new RShiftLNode(a,b) );
3200 push_pair(c);
3201 break;
3202 case Bytecodes::_lushr:
3203 b = pop(); // the shift count
3204 a = pop_pair(); // value to be shifted
3205 c = _gvn.transform( new URShiftLNode(a,b) );
3206 push_pair(c);
3207 break;
3208 case Bytecodes::_lmul:
3209 b = pop_pair();
3210 a = pop_pair();
3211 c = _gvn.transform( new MulLNode(a,b) );
3212 push_pair(c);
3213 break;
3214
3215 case Bytecodes::_lrem:
3216 // Must keep both values on the expression-stack during null-check
3217 assert(peek(0) == top(), "long word order");
3218 zero_check_long(peek(1));
3219 // Compile-time detect of null-exception?
3220 if (stopped()) return;
3221 b = pop_pair();
3222 a = pop_pair();
3223 c = _gvn.transform( new ModLNode(control(),a,b) );
3224 push_pair(c);
3225 break;
3226
3227 case Bytecodes::_ldiv:
3228 // Must keep both values on the expression-stack during null-check
3229 assert(peek(0) == top(), "long word order");
3230 zero_check_long(peek(1));
3231 // Compile-time detect of null-exception?
3232 if (stopped()) return;
3233 b = pop_pair();
3234 a = pop_pair();
3235 c = _gvn.transform( new DivLNode(control(),a,b) );
3236 push_pair(c);
3237 break;
3238
3239 case Bytecodes::_ladd:
3240 b = pop_pair();
3241 a = pop_pair();
3242 c = _gvn.transform( new AddLNode(a,b) );
3243 push_pair(c);
3244 break;
3245 case Bytecodes::_lsub:
3246 b = pop_pair();
3247 a = pop_pair();
3248 c = _gvn.transform( new SubLNode(a,b) );
3249 push_pair(c);
3250 break;
3251 case Bytecodes::_lcmp:
3252 // Safepoints are now inserted _before_ branches. The long-compare
3253 // bytecode painfully produces a 3-way value (-1,0,+1) which requires a
3254 // slew of control flow. These are usually followed by a CmpI vs zero and
3255 // a branch; this pattern then optimizes to the obvious long-compare and
3256 // branch. However, if the branch is backwards there's a Safepoint
3257 // inserted. The inserted Safepoint captures the JVM state at the
3258 // pre-branch point, i.e. it captures the 3-way value. Thus if a
3259 // long-compare is used to control a loop the debug info will force
3260 // computation of the 3-way value, even though the generated code uses a
3261 // long-compare and branch. We try to rectify the situation by inserting
3262 // a SafePoint here and have it dominate and kill the safepoint added at a
3263 // following backwards branch. At this point the JVM state merely holds 2
3264 // longs but not the 3-way value.
3265 switch (iter().next_bc()) {
3266 case Bytecodes::_ifgt:
3267 case Bytecodes::_iflt:
3268 case Bytecodes::_ifge:
3269 case Bytecodes::_ifle:
3270 case Bytecodes::_ifne:
3271 case Bytecodes::_ifeq:
3272 // If this is a backwards branch in the bytecodes, add Safepoint
3273 maybe_add_safepoint(iter().next_get_dest());
3274 default:
3275 break;
3276 }
3277 b = pop_pair();
3278 a = pop_pair();
3279 c = _gvn.transform( new CmpL3Node( a, b ));
3280 push(c);
3281 break;
3282
3283 case Bytecodes::_lneg:
3284 a = pop_pair();
3285 b = _gvn.transform( new SubLNode(longcon(0),a));
3286 push_pair(b);
3287 break;
3288 case Bytecodes::_l2i:
3289 a = pop_pair();
3290 push( _gvn.transform( new ConvL2INode(a)));
3291 break;
3292 case Bytecodes::_i2l:
3293 a = pop();
3294 b = _gvn.transform( new ConvI2LNode(a));
3295 push_pair(b);
3296 break;
3297 case Bytecodes::_i2b:
3298 // Sign extend
3299 a = pop();
3300 a = Compile::narrow_value(T_BYTE, a, nullptr, &_gvn, true);
3301 push(a);
3302 break;
3303 case Bytecodes::_i2s:
3304 a = pop();
3305 a = Compile::narrow_value(T_SHORT, a, nullptr, &_gvn, true);
3306 push(a);
3307 break;
3308 case Bytecodes::_i2c:
3309 a = pop();
3310 a = Compile::narrow_value(T_CHAR, a, nullptr, &_gvn, true);
3311 push(a);
3312 break;
3313
3314 case Bytecodes::_i2f:
3315 a = pop();
3316 b = _gvn.transform( new ConvI2FNode(a) ) ;
3317 c = precision_rounding(b);
3318 push (b);
3319 break;
3320
3321 case Bytecodes::_i2d:
3322 a = pop();
3323 b = _gvn.transform( new ConvI2DNode(a));
3324 push_pair(b);
3325 break;
3326
3327 case Bytecodes::_iinc: // Increment local
3328 i = iter().get_index(); // Get local index
3329 set_local( i, _gvn.transform( new AddINode( _gvn.intcon(iter().get_iinc_con()), local(i) ) ) );
3330 break;
3331
3332 // Exit points of synchronized methods must have an unlock node
3333 case Bytecodes::_return:
3334 return_current(nullptr);
3335 break;
3336
3337 case Bytecodes::_ireturn:
3338 case Bytecodes::_areturn:
3339 case Bytecodes::_freturn:
3340 return_current(pop());
3341 break;
3342 case Bytecodes::_lreturn:
3343 return_current(pop_pair());
3344 break;
3345 case Bytecodes::_dreturn:
3346 return_current(pop_pair());
3347 break;
3348
3349 case Bytecodes::_athrow:
3350 // null exception oop throws null pointer exception
3351 null_check(peek());
3352 if (stopped()) return;
3353 // Hook the thrown exception directly to subsequent handlers.
3354 if (BailoutToInterpreterForThrows) {
3355 // Keep method interpreted from now on.
3356 uncommon_trap(Deoptimization::Reason_unhandled,
3357 Deoptimization::Action_make_not_compilable);
3358 return;
3359 }
3360 if (env()->jvmti_can_post_on_exceptions()) {
3361 // check if we must post exception events, take uncommon trap if so (with must_throw = false)
3362 uncommon_trap_if_should_post_on_exceptions(Deoptimization::Reason_unhandled, false);
3363 }
3364 // Here if either can_post_on_exceptions or should_post_on_exceptions is false
3365 add_exception_state(make_exception_state(peek()));
3366 break;
3367
3368 case Bytecodes::_goto: // fall through
3369 case Bytecodes::_goto_w: {
3370 int target_bci = (bc() == Bytecodes::_goto) ? iter().get_dest() : iter().get_far_dest();
3371
3372 // If this is a backwards branch in the bytecodes, add Safepoint
3373 maybe_add_safepoint(target_bci);
3374
3375 // Merge the current control into the target basic block
3376 merge(target_bci);
3377
3378 // See if we can get some profile data and hand it off to the next block
3379 Block *target_block = block()->successor_for_bci(target_bci);
3380 if (target_block->pred_count() != 1) break;
3381 ciMethodData* methodData = method()->method_data();
3382 if (!methodData->is_mature()) break;
3383 ciProfileData* data = methodData->bci_to_data(bci());
3384 assert(data != nullptr && data->is_JumpData(), "need JumpData for taken branch");
3385 int taken = ((ciJumpData*)data)->taken();
3386 taken = method()->scale_count(taken);
3387 target_block->set_count(taken);
3388 break;
3389 }
3390
3391 case Bytecodes::_ifnull: btest = BoolTest::eq; goto handle_if_null;
3392 case Bytecodes::_ifnonnull: btest = BoolTest::ne; goto handle_if_null;
3393 handle_if_null:
3394 // If this is a backwards branch in the bytecodes, add Safepoint
3395 maybe_add_safepoint(iter().get_dest());
3396 a = null();
3397 b = pop();
3398 if (b->is_InlineType()) {
3399 // Null checking a scalarized but nullable inline type. Check the IsInit
3400 // input instead of the oop input to avoid keeping buffer allocations alive
3401 c = _gvn.transform(new CmpINode(b->as_InlineType()->get_is_init(), zerocon(T_INT)));
3402 } else {
3403 if (!_gvn.type(b)->speculative_maybe_null() &&
3404 !too_many_traps(Deoptimization::Reason_speculate_null_check)) {
3405 inc_sp(1);
3406 Node* null_ctl = top();
3407 b = null_check_oop(b, &null_ctl, true, true, true);
3408 assert(null_ctl->is_top(), "no null control here");
3409 dec_sp(1);
3410 } else if (_gvn.type(b)->speculative_always_null() &&
3411 !too_many_traps(Deoptimization::Reason_speculate_null_assert)) {
3412 inc_sp(1);
3413 b = null_assert(b);
3414 dec_sp(1);
3415 }
3416 c = _gvn.transform( new CmpPNode(b, a) );
3417 }
3418 do_ifnull(btest, c);
3419 break;
3420
3421 case Bytecodes::_if_acmpeq: btest = BoolTest::eq; goto handle_if_acmp;
3422 case Bytecodes::_if_acmpne: btest = BoolTest::ne; goto handle_if_acmp;
3423 handle_if_acmp:
3424 // If this is a backwards branch in the bytecodes, add Safepoint
3425 maybe_add_safepoint(iter().get_dest());
3426 a = pop();
3427 b = pop();
3428 do_acmp(btest, b, a);
3429 break;
3430
3431 case Bytecodes::_ifeq: btest = BoolTest::eq; goto handle_ifxx;
3432 case Bytecodes::_ifne: btest = BoolTest::ne; goto handle_ifxx;
3433 case Bytecodes::_iflt: btest = BoolTest::lt; goto handle_ifxx;
3434 case Bytecodes::_ifle: btest = BoolTest::le; goto handle_ifxx;
3435 case Bytecodes::_ifgt: btest = BoolTest::gt; goto handle_ifxx;
3436 case Bytecodes::_ifge: btest = BoolTest::ge; goto handle_ifxx;
3437 handle_ifxx:
3438 // If this is a backwards branch in the bytecodes, add Safepoint
3439 maybe_add_safepoint(iter().get_dest());
3440 a = _gvn.intcon(0);
3441 b = pop();
3442 c = _gvn.transform( new CmpINode(b, a) );
3443 do_if(btest, c);
3444 break;
3445
3446 case Bytecodes::_if_icmpeq: btest = BoolTest::eq; goto handle_if_icmp;
3447 case Bytecodes::_if_icmpne: btest = BoolTest::ne; goto handle_if_icmp;
3448 case Bytecodes::_if_icmplt: btest = BoolTest::lt; goto handle_if_icmp;
3449 case Bytecodes::_if_icmple: btest = BoolTest::le; goto handle_if_icmp;
3450 case Bytecodes::_if_icmpgt: btest = BoolTest::gt; goto handle_if_icmp;
3451 case Bytecodes::_if_icmpge: btest = BoolTest::ge; goto handle_if_icmp;
3452 handle_if_icmp:
3453 // If this is a backwards branch in the bytecodes, add Safepoint
3454 maybe_add_safepoint(iter().get_dest());
3455 a = pop();
3456 b = pop();
3457 c = _gvn.transform( new CmpINode( b, a ) );
3458 do_if(btest, c);
3459 break;
3460
3461 case Bytecodes::_tableswitch:
3462 do_tableswitch();
3463 break;
3464
3465 case Bytecodes::_lookupswitch:
3466 do_lookupswitch();
3467 break;
3468
3469 case Bytecodes::_invokestatic:
3470 case Bytecodes::_invokedynamic:
3471 case Bytecodes::_invokespecial:
3472 case Bytecodes::_invokevirtual:
3473 case Bytecodes::_invokeinterface:
3474 do_call();
3475 break;
3476 case Bytecodes::_checkcast:
3477 do_checkcast();
3478 break;
3479 case Bytecodes::_instanceof:
3480 do_instanceof();
3481 break;
3482 case Bytecodes::_anewarray:
3483 do_newarray();
3484 break;
3485 case Bytecodes::_newarray:
3486 do_newarray((BasicType)iter().get_index());
3487 break;
3488 case Bytecodes::_multianewarray:
3489 do_multianewarray();
3490 break;
3491 case Bytecodes::_new:
3492 do_new();
3493 break;
3494 case Bytecodes::_aconst_init:
3495 do_aconst_init();
3496 break;
3497 case Bytecodes::_withfield:
3498 do_withfield();
3499 break;
3500
3501 case Bytecodes::_jsr:
3502 case Bytecodes::_jsr_w:
3503 do_jsr();
3504 break;
3505
3506 case Bytecodes::_ret:
3507 do_ret();
3508 break;
3509
3510
3511 case Bytecodes::_monitorenter:
3512 do_monitor_enter();
3513 break;
3514
3515 case Bytecodes::_monitorexit:
3516 do_monitor_exit();
3517 break;
3518
3519 case Bytecodes::_breakpoint:
3520 // Breakpoint set concurrently to compile
3521 // %%% use an uncommon trap?
3522 C->record_failure("breakpoint in method");
3523 return;
3524
3525 default:
3526 #ifndef PRODUCT
3527 map()->dump(99);
3528 #endif
3529 tty->print("\nUnhandled bytecode %s\n", Bytecodes::name(bc()) );
3530 ShouldNotReachHere();
3531 }
3532
3533 #ifndef PRODUCT
3534 if (C->should_print_igv(1)) {
3535 IdealGraphPrinter* printer = C->igv_printer();
3536 char buffer[256];
3537 jio_snprintf(buffer, sizeof(buffer), "Bytecode %d: %s", bci(), Bytecodes::name(bc()));
3538 bool old = printer->traverse_outs();
3539 printer->set_traverse_outs(true);
3540 printer->print_method(buffer, 4);
3541 printer->set_traverse_outs(old);
3542 }
3543 #endif
3544 }