1 /*
2 * Copyright (c) 2017, 2020, 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/ciInlineKlass.hpp"
27 #include "gc/shared/barrierSet.hpp"
28 #include "gc/shared/gc_globals.hpp"
29 #include "opto/addnode.hpp"
30 #include "opto/castnode.hpp"
31 #include "opto/graphKit.hpp"
32 #include "opto/inlinetypenode.hpp"
33 #include "opto/rootnode.hpp"
34 #include "opto/phaseX.hpp"
35
36 // Clones the inline type to handle control flow merges involving multiple inline types.
37 // The inputs are replaced by PhiNodes to represent the merged values for the given region.
38 InlineTypeBaseNode* InlineTypeBaseNode::clone_with_phis(PhaseGVN* gvn, Node* region, bool is_init) {
39 InlineTypeBaseNode* vt = clone()->as_InlineTypeBase();
40 if (vt->is_InlineTypePtr()) {
41 // Use nullable type
42 const Type* t = Type::get_const_type(inline_klass());
43 gvn->set_type(vt, t);
44 vt->as_InlineTypePtr()->set_type(t);
45 }
46
47 // Create a PhiNode for merging the oop values
48 const Type* phi_type = Type::get_const_type(inline_klass());
49 PhiNode* oop = PhiNode::make(region, vt->get_oop(), phi_type);
50 gvn->set_type(oop, phi_type);
51 gvn->record_for_igvn(oop);
52 vt->set_oop(oop);
53
54 // Create a PhiNode for merging the is_init values
55 Node* is_init_node;
56 if (is_init) {
57 is_init_node = gvn->intcon(1);
58 } else {
59 phi_type = Type::get_const_basic_type(T_BOOLEAN);
60 is_init_node = PhiNode::make(region, vt->get_is_init(), phi_type);
61 gvn->set_type(is_init_node, phi_type);
62 gvn->record_for_igvn(is_init_node);
63 }
64 vt->set_req(IsInit, is_init_node);
65
66 // Create a PhiNode each for merging the field values
67 for (uint i = 0; i < vt->field_count(); ++i) {
68 ciType* type = vt->field_type(i);
69 Node* value = vt->field_value(i);
70 if (value->is_InlineTypeBase()) {
71 // Handle inline type fields recursively
72 value = value->as_InlineTypeBase()->clone_with_phis(gvn, region);
73 } else {
74 phi_type = Type::get_const_type(type);
75 value = PhiNode::make(region, value, phi_type);
76 gvn->set_type(value, phi_type);
77 gvn->record_for_igvn(value);
78 }
79 vt->set_field_value(i, value);
80 }
81 gvn->set_type(vt, vt->bottom_type());
82 gvn->record_for_igvn(vt);
83 return vt;
84 }
85
86 // Checks if the inputs of the InlineTypeBaseTypeNode were replaced by PhiNodes
87 // for the given region (see InlineTypeBaseTypeNode::clone_with_phis).
88 bool InlineTypeBaseNode::has_phi_inputs(Node* region) {
89 // Check oop input
90 bool result = get_oop()->is_Phi() && get_oop()->as_Phi()->region() == region;
91 #ifdef ASSERT
92 if (result) {
93 // Check all field value inputs for consistency
94 for (uint i = Values; i < field_count(); ++i) {
95 Node* n = in(i);
96 if (n->is_InlineTypeBase()) {
97 assert(n->as_InlineTypeBase()->has_phi_inputs(region), "inconsistent phi inputs");
98 } else {
99 assert(n->is_Phi() && n->as_Phi()->region() == region, "inconsistent phi inputs");
100 }
101 }
102 }
103 #endif
104 return result;
105 }
106
107 // Check if all inline type fields have inline type node values
108 bool InlineTypeBaseNode::can_merge() {
109 for (uint i = 0; i < field_count(); ++i) {
110 ciType* type = field_type(i);
111 Node* val = field_value(i);
112 if (type->is_inlinetype() &&
113 (!val->is_InlineTypeBase() || !val->as_InlineTypeBase()->can_merge())) {
114 return false;
115 }
116 }
117 return true;
118 }
119
120 // Merges 'this' with 'other' by updating the input PhiNodes added by 'clone_with_phis'
121 InlineTypeBaseNode* InlineTypeBaseNode::merge_with(PhaseGVN* gvn, const InlineTypeBaseNode* other, int pnum, bool transform) {
122 // Merge oop inputs
123 PhiNode* phi = get_oop()->as_Phi();
124 phi->set_req(pnum, other->get_oop());
125 if (transform) {
126 set_oop(gvn->transform(phi));
127 }
128
129 Node* is_init = get_is_init();
130 if (is_init->is_Phi()) {
131 phi = is_init->as_Phi();
132 phi->set_req(pnum, other->get_is_init());
133 if (transform) {
134 set_req(IsInit, gvn->transform(phi));
135 }
136 } else {
137 assert(is_init->find_int_con(0) == 1, "only with a non null inline type");
138 }
139
140 // Merge field values
141 for (uint i = 0; i < field_count(); ++i) {
142 Node* val1 = field_value(i);
143 Node* val2 = other->field_value(i);
144 if (val1->is_InlineTypeBase()) {
145 val1->as_InlineTypeBase()->merge_with(gvn, val2->as_InlineTypeBase(), pnum, transform);
146 } else {
147 assert(val1->is_Phi(), "must be a phi node");
148 val1->set_req(pnum, val2);
149 }
150 if (transform) {
151 set_field_value(i, gvn->transform(val1));
152 }
153 }
154 return this;
155 }
156
157 // Adds a new merge path to an inline type node with phi inputs
158 void InlineTypeBaseNode::add_new_path(Node* region) {
159 assert(has_phi_inputs(region), "must have phi inputs");
160
161 PhiNode* phi = get_oop()->as_Phi();
162 phi->add_req(NULL);
163 assert(phi->req() == region->req(), "must be same size as region");
164
165 phi = get_is_init()->as_Phi();
166 phi->add_req(NULL);
167 assert(phi->req() == region->req(), "must be same size as region");
168
169 for (uint i = 0; i < field_count(); ++i) {
170 Node* val = field_value(i);
171 if (val->is_InlineTypeBase()) {
172 val->as_InlineTypeBase()->add_new_path(region);
173 } else {
174 val->as_Phi()->add_req(NULL);
175 assert(val->req() == region->req(), "must be same size as region");
176 }
177 }
178 }
179
180 Node* InlineTypeBaseNode::field_value(uint index) const {
181 assert(index < field_count(), "index out of bounds");
182 return in(Values + index);
183 }
184
185 // Get the value of the field at the given offset.
186 // If 'recursive' is true, flattened inline type fields will be resolved recursively.
187 Node* InlineTypeBaseNode::field_value_by_offset(int offset, bool recursive) const {
188 // If the field at 'offset' belongs to a flattened inline type field, 'index' refers to the
189 // corresponding InlineTypeNode input and 'sub_offset' is the offset in flattened inline type.
190 int index = inline_klass()->field_index_by_offset(offset);
191 int sub_offset = offset - field_offset(index);
192 Node* value = field_value(index);
193 assert(value != NULL, "field value not found");
194 if (recursive && value->is_InlineTypeBase()) {
195 if (field_is_flattened(index)) {
196 // Flattened inline type field
197 InlineTypeBaseNode* vt = value->as_InlineTypeBase();
198 sub_offset += vt->inline_klass()->first_field_offset(); // Add header size
199 return vt->field_value_by_offset(sub_offset, recursive);
200 } else {
201 assert(sub_offset == 0, "should not have a sub offset");
202 return value;
203 }
204 }
205 assert(!(recursive && value->is_InlineTypeBase()), "should not be an inline type");
206 assert(sub_offset == 0, "offset mismatch");
207 return value;
208 }
209
210 void InlineTypeBaseNode::set_field_value(uint index, Node* value) {
211 assert(index < field_count(), "index out of bounds");
212 set_req(Values + index, value);
213 }
214
215 void InlineTypeBaseNode::set_field_value_by_offset(int offset, Node* value) {
216 set_field_value(field_index(offset), value);
217 }
218
219 int InlineTypeBaseNode::field_offset(uint index) const {
220 assert(index < field_count(), "index out of bounds");
221 return inline_klass()->declared_nonstatic_field_at(index)->offset();
222 }
223
224 uint InlineTypeBaseNode::field_index(int offset) const {
225 uint i = 0;
226 for (; i < field_count() && field_offset(i) != offset; i++) { }
227 assert(i < field_count(), "field not found");
228 return i;
229 }
230
231 ciType* InlineTypeBaseNode::field_type(uint index) const {
232 assert(index < field_count(), "index out of bounds");
233 return inline_klass()->declared_nonstatic_field_at(index)->type();
234 }
235
236 bool InlineTypeBaseNode::field_is_flattened(uint index) const {
237 assert(index < field_count(), "index out of bounds");
238 ciField* field = inline_klass()->declared_nonstatic_field_at(index);
239 assert(!field->is_flattened() || field->type()->is_inlinetype(), "must be an inline type");
240 return field->is_flattened();
241 }
242
243 bool InlineTypeBaseNode::field_is_null_free(uint index) const {
244 assert(index < field_count(), "index out of bounds");
245 ciField* field = inline_klass()->declared_nonstatic_field_at(index);
246 assert(!field->is_flattened() || field->type()->is_inlinetype(), "must be an inline type");
247 return field->is_null_free();
248 }
249
250 void InlineTypeBaseNode::make_scalar_in_safepoint(PhaseIterGVN* igvn, Unique_Node_List& worklist, SafePointNode* sfpt) {
251 ciInlineKlass* vk = inline_klass();
252 uint nfields = vk->nof_nonstatic_fields();
253 JVMState* jvms = sfpt->jvms();
254 // Replace safepoint edge by SafePointScalarObjectNode and add field values
255 assert(jvms != NULL, "missing JVMS");
256 uint first_ind = (sfpt->req() - jvms->scloff());
257 SafePointScalarObjectNode* sobj = new SafePointScalarObjectNode(inline_ptr(),
258 #ifdef ASSERT
259 NULL,
260 #endif
261 first_ind, nfields);
262 sobj->init_req(0, igvn->C->root());
263 // Nullable inline types have an IsInit field that needs
264 // to be checked before using the field values.
265 if (!igvn->type(get_is_init())->is_int()->is_con(1)) {
266 sfpt->add_req(get_is_init());
267 } else {
268 sfpt->add_req(igvn->C->top());
269 }
270 // Iterate over the inline type fields in order of increasing
271 // offset and add the field values to the safepoint.
272 for (uint j = 0; j < nfields; ++j) {
273 int offset = vk->nonstatic_field_at(j)->offset();
274 Node* value = field_value_by_offset(offset, true /* include flattened inline type fields */);
275 if (value->is_InlineTypeBase()) {
276 // Add inline type field to the worklist to process later
277 worklist.push(value);
278 }
279 sfpt->add_req(value);
280 }
281 jvms->set_endoff(sfpt->req());
282 sobj = igvn->transform(sobj)->as_SafePointScalarObject();
283 igvn->rehash_node_delayed(sfpt);
284 for (uint i = jvms->debug_start(); i < jvms->debug_end(); i++) {
285 Node* debug = sfpt->in(i);
286 if (debug != NULL && debug->uncast() == this) {
287 sfpt->set_req(i, sobj);
288 }
289 }
290 }
291
292 void InlineTypeBaseNode::make_scalar_in_safepoints(PhaseIterGVN* igvn, bool allow_oop) {
293 // If the inline type has a constant or loaded oop, use the oop instead of scalarization
294 // in the safepoint to avoid keeping field loads live just for the debug info.
295 Node* oop = get_oop();
296 bool use_oop = allow_oop && (is_InlineTypePtr() || is_allocated(igvn)) &&
297 (oop->is_Con() || oop->is_Parm() || oop->is_Load() || (oop->isa_DecodeN() && oop->in(1)->is_Load()));
298
299 ResourceMark rm;
300 Unique_Node_List safepoints;
301 Unique_Node_List vt_worklist;
302 Unique_Node_List worklist;
303 worklist.push(this);
304 while (worklist.size() > 0) {
305 Node* n = worklist.pop();
306 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
307 Node* use = n->fast_out(i);
308 if (use->is_SafePoint() && !use->is_CallLeaf() && (!use->is_Call() || use->as_Call()->has_debug_use(n))) {
309 safepoints.push(use);
310 } else if (use->is_ConstraintCast()) {
311 worklist.push(use);
312 }
313 }
314 }
315
316 // Process all safepoint uses and scalarize inline type
317 while (safepoints.size() > 0) {
318 SafePointNode* sfpt = safepoints.pop()->as_SafePoint();
319 if (use_oop) {
320 for (uint i = sfpt->jvms()->debug_start(); i < sfpt->jvms()->debug_end(); i++) {
321 Node* debug = sfpt->in(i);
322 if (debug != NULL && debug->uncast() == this) {
323 sfpt->set_req(i, get_oop());
324 }
325 }
326 igvn->rehash_node_delayed(sfpt);
327 } else {
328 make_scalar_in_safepoint(igvn, vt_worklist, sfpt);
329 }
330 }
331 // Now scalarize non-flattened fields
332 for (uint i = 0; i < vt_worklist.size(); ++i) {
333 InlineTypeBaseNode* vt = vt_worklist.at(i)->isa_InlineTypeBase();
334 vt->make_scalar_in_safepoints(igvn);
335 }
336 if (outcnt() == 0) {
337 igvn->_worklist.push(this);
338 }
339 }
340
341 const TypePtr* InlineTypeBaseNode::field_adr_type(Node* base, int offset, ciInstanceKlass* holder, DecoratorSet decorators, PhaseGVN& gvn) const {
342 const TypeAryPtr* ary_type = gvn.type(base)->isa_aryptr();
343 const TypePtr* adr_type = NULL;
344 bool is_array = ary_type != NULL;
345 if ((decorators & C2_MISMATCHED) != 0) {
346 adr_type = TypeRawPtr::BOTTOM;
347 } else if (is_array) {
348 // In the case of a flattened inline type array, each field has its own slice
349 adr_type = ary_type->with_field_offset(offset)->add_offset(Type::OffsetBot);
350 } else {
351 ciField* field = holder->get_field_by_offset(offset, false);
352 assert(field != NULL, "field not found");
353 adr_type = gvn.C->alias_type(field)->adr_type();
354 }
355 return adr_type;
356 }
357
358 void InlineTypeBaseNode::load(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder, int holder_offset, DecoratorSet decorators) {
359 // Initialize the inline type by loading its field values from
360 // memory and adding the values as input edges to the node.
361 for (uint i = 0; i < field_count(); ++i) {
362 int offset = holder_offset + field_offset(i);
363 Node* value = NULL;
364 ciType* ft = field_type(i);
365 bool null_free = field_is_null_free(i);
366 if (null_free && ft->as_inline_klass()->is_empty()) {
367 // Loading from a field of an empty inline type. Just return the default instance.
368 value = InlineTypeNode::make_default(kit->gvn(), ft->as_inline_klass());
369 } else if (field_is_flattened(i)) {
370 // Recursively load the flattened inline type field
371 value = InlineTypeNode::make_from_flattened(kit, ft->as_inline_klass(), base, ptr, holder, offset, decorators);
372 } else {
373 const TypeOopPtr* oop_ptr = kit->gvn().type(base)->isa_oopptr();
374 bool is_array = (oop_ptr->isa_aryptr() != NULL);
375 bool mismatched = (decorators & C2_MISMATCHED) != 0;
376 if (base->is_Con() && !is_array && !mismatched) {
377 // If the oop to the inline type is constant (static final field), we can
378 // also treat the fields as constants because the inline type is immutable.
379 ciObject* constant_oop = oop_ptr->const_oop();
380 ciField* field = holder->get_field_by_offset(offset, false);
381 assert(field != NULL, "field not found");
382 ciConstant constant = constant_oop->as_instance()->field_value(field);
383 const Type* con_type = Type::make_from_constant(constant, /*require_const=*/ true);
384 assert(con_type != NULL, "type not found");
385 value = kit->gvn().transform(kit->makecon(con_type));
386 // Check type of constant which might be more precise than the static field type
387 if (con_type->is_inlinetypeptr() && !con_type->is_zero_type()) {
388 ft = con_type->inline_klass();
389 null_free = true;
390 }
391 } else {
392 // Load field value from memory
393 const TypePtr* adr_type = field_adr_type(base, offset, holder, decorators, kit->gvn());
394 Node* adr = kit->basic_plus_adr(base, ptr, offset);
395 BasicType bt = type2field[ft->basic_type()];
396 assert(is_java_primitive(bt) || adr->bottom_type()->is_ptr_to_narrowoop() == UseCompressedOops, "inconsistent");
397 const Type* val_type = Type::get_const_type(ft);
398 if (is_array) {
399 decorators |= IS_ARRAY;
400 }
401 value = kit->access_load_at(base, adr, adr_type, val_type, bt, decorators);
402 }
403 // Loading a non-flattened inline type from memory
404 if (ft->is_inlinetype()) {
405 value = InlineTypeNode::make_from_oop(kit, value, ft->as_inline_klass(), null_free);
406 }
407 }
408 set_field_value(i, value);
409 }
410 }
411
412 void InlineTypeBaseNode::store_flattened(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder, int holder_offset, DecoratorSet decorators) const {
413 if (kit->gvn().type(base)->isa_aryptr()) {
414 kit->C->set_flattened_accesses();
415 }
416 // The inline type is embedded into the object without an oop header. Subtract the
417 // offset of the first field to account for the missing header when storing the values.
418 if (holder == NULL) {
419 holder = inline_klass();
420 }
421 holder_offset -= inline_klass()->first_field_offset();
422 store(kit, base, ptr, holder, holder_offset, decorators);
423 }
424
425 void InlineTypeBaseNode::store(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder, int holder_offset, DecoratorSet decorators) const {
426 // Write field values to memory
427 for (uint i = 0; i < field_count(); ++i) {
428 int offset = holder_offset + field_offset(i);
429 Node* value = field_value(i);
430 ciType* ft = field_type(i);
431 if (field_is_flattened(i)) {
432 // Recursively store the flattened inline type field
433 if (!value->is_InlineTypeBase()) {
434 value = InlineTypeNode::make_from_oop(kit, value, ft->as_inline_klass());
435 }
436 value->as_InlineTypeBase()->store_flattened(kit, base, ptr, holder, offset, decorators);
437 } else {
438 // Store field value to memory
439 const TypePtr* adr_type = field_adr_type(base, offset, holder, decorators, kit->gvn());
440 Node* adr = kit->basic_plus_adr(base, ptr, offset);
441 BasicType bt = type2field[ft->basic_type()];
442 assert(is_java_primitive(bt) || adr->bottom_type()->is_ptr_to_narrowoop() == UseCompressedOops, "inconsistent");
443 const Type* val_type = Type::get_const_type(ft);
444 const TypeAryPtr* ary_type = kit->gvn().type(base)->isa_aryptr();
445 if (ary_type != NULL) {
446 decorators |= IS_ARRAY;
447 }
448 kit->access_store_at(base, adr, adr_type, value, val_type, bt, decorators);
449 }
450 }
451 }
452
453 InlineTypePtrNode* InlineTypeBaseNode::buffer(GraphKit* kit, bool safe_for_replace) {
454 assert(is_InlineType(), "sanity");
455
456 // Check if inline type is already buffered
457 Node* not_buffered_ctl = kit->top();
458 Node* not_null_oop = kit->null_check_oop(get_oop(), ¬_buffered_ctl, /* never_see_null = */ false, safe_for_replace);
459 if (not_buffered_ctl->is_top()) {
460 // Already buffered
461 InlineTypePtrNode* ptr = as_ptr(&kit->gvn(), false);
462 if (safe_for_replace) {
463 kit->replace_in_map(this, ptr);
464 }
465 return ptr;
466 }
467 Node* buffered_ctl = kit->control();
468 kit->set_control(not_buffered_ctl);
469
470 // Inline type is not buffered, check if it is null.
471 Node* null_ctl = kit->top();
472 kit->null_check_common(get_is_init(), T_INT, false, &null_ctl);
473 bool null_free = null_ctl->is_top();
474
475 RegionNode* region = new RegionNode(4);
476 PhiNode* oop = PhiNode::make(region, not_null_oop, inline_ptr()->join_speculative(null_free ? TypePtr::NOTNULL : TypePtr::BOTTOM));
477
478 // InlineType is already buffered
479 region->init_req(1, buffered_ctl);
480 oop->init_req(1, not_null_oop);
481
482 // InlineType is null
483 region->init_req(2, null_ctl);
484 oop->init_req(2, kit->gvn().zerocon(T_OBJECT));
485
486 PhiNode* io = PhiNode::make(region, kit->i_o(), Type::ABIO);
487 PhiNode* mem = PhiNode::make(region, kit->merged_memory(), Type::MEMORY, TypePtr::BOTTOM);
488
489 int bci = kit->bci();
490 bool reexecute = kit->jvms()->should_reexecute();
491 if (!kit->stopped()) {
492 assert(!is_allocated(&kit->gvn()), "already buffered");
493
494 // Allocate and initialize buffer
495 PreserveJVMState pjvms(kit);
496 // Propagate re-execution state and bci
497 kit->set_bci(bci);
498 kit->jvms()->set_bci(bci);
499 kit->jvms()->set_should_reexecute(reexecute);
500
501 kit->kill_dead_locals();
502 ciInlineKlass* vk = inline_klass();
503 Node* klass_node = kit->makecon(TypeKlassPtr::make(vk));
504 Node* alloc_oop = kit->new_instance(klass_node, NULL, NULL, /* deoptimize_on_exception */ true, this);
505 store(kit, alloc_oop, alloc_oop, vk);
506
507 // Do not let stores that initialize this buffer be reordered with a subsequent
508 // store that would make this buffer accessible by other threads.
509 AllocateNode* alloc = AllocateNode::Ideal_allocation(alloc_oop, &kit->gvn());
510 assert(alloc != NULL, "must have an allocation node");
511 kit->insert_mem_bar(Op_MemBarStoreStore, alloc->proj_out_or_null(AllocateNode::RawAddress));
512
513 region->init_req(3, kit->control());
514 oop ->init_req(3, alloc_oop);
515 io ->init_req(3, kit->i_o());
516 mem ->init_req(3, kit->merged_memory());
517 }
518
519 // Update GraphKit
520 kit->set_control(kit->gvn().transform(region));
521 kit->set_i_o(kit->gvn().transform(io));
522 kit->set_all_memory(kit->gvn().transform(mem));
523 kit->record_for_igvn(region);
524 kit->record_for_igvn(oop);
525 kit->record_for_igvn(io);
526 kit->record_for_igvn(mem);
527
528 // Use cloned InlineTypeNode to propagate oop from now on
529 Node* res_oop = kit->gvn().transform(oop);
530 InlineTypeBaseNode* vt = clone()->as_InlineTypeBase();
531 vt->set_oop(res_oop);
532 vt = kit->gvn().transform(vt)->as_InlineTypeBase();
533 if (safe_for_replace) {
534 kit->replace_in_map(this, vt);
535 }
536 // InlineTypeNode::remove_redundant_allocations piggybacks on split if.
537 // Make sure it gets a chance to remove this allocation.
538 kit->C->set_has_split_ifs(true);
539 return vt->as_ptr(&kit->gvn(), null_free);
540 }
541
542 bool InlineTypeBaseNode::is_allocated(PhaseGVN* phase) const {
543 Node* oop = get_oop();
544 const Type* oop_type = (phase != NULL) ? phase->type(oop) : oop->bottom_type();
545 return !oop_type->maybe_null();
546 }
547
548 InlineTypePtrNode* InlineTypeBaseNode::as_ptr(PhaseGVN* phase, bool null_free) const {
549 assert(!null_free || is_allocated(phase), "must be allocated");
550 if (is_InlineTypePtr()) {
551 return as_InlineTypePtr();
552 }
553 return phase->transform(new InlineTypePtrNode(this, null_free))->as_InlineTypePtr();
554 }
555
556 // When a call returns multiple values, it has several result
557 // projections, one per field. Replacing the result of the call by an
558 // inline type node (after late inlining) requires that for each result
559 // projection, we find the corresponding inline type field.
560 void InlineTypeBaseNode::replace_call_results(GraphKit* kit, CallNode* call, Compile* C, bool null_free) {
561 ciInlineKlass* vk = inline_klass();
562 for (DUIterator_Fast imax, i = call->fast_outs(imax); i < imax; i++) {
563 ProjNode* pn = call->fast_out(i)->as_Proj();
564 uint con = pn->_con;
565 Node* field = NULL;
566 if (con == TypeFunc::Parms) {
567 field = get_oop();
568 } else if (!null_free && con == (call->tf()->range_cc()->cnt() - 1)) {
569 field = get_is_init();
570 } else if (con > TypeFunc::Parms) {
571 uint field_nb = con - (TypeFunc::Parms+1);
572 int extra = 0;
573 for (uint j = 0; j < field_nb - extra; j++) {
574 ciField* f = vk->nonstatic_field_at(j);
575 BasicType bt = f->type()->basic_type();
576 if (bt == T_LONG || bt == T_DOUBLE) {
577 extra++;
578 }
579 }
580 ciField* f = vk->nonstatic_field_at(field_nb - extra);
581 field = field_value_by_offset(f->offset(), true);
582 if (field->is_InlineType()) {
583 assert(field->as_InlineType()->is_allocated(&kit->gvn()), "must be allocated");
584 field = field->as_InlineType()->get_oop();
585 }
586 }
587 if (field != NULL) {
588 C->gvn_replace_by(pn, field);
589 C->initial_gvn()->hash_delete(pn);
590 pn->set_req(0, C->top());
591 --i; --imax;
592 }
593 }
594 }
595
596 Node* InlineTypeBaseNode::allocate_fields(GraphKit* kit) {
597 InlineTypeBaseNode* vt = clone()->as_InlineTypeBase();
598 for (uint i = 0; i < field_count(); i++) {
599 Node* value = field_value(i);
600 if (field_is_flattened(i)) {
601 // Flattened inline type field
602 vt->set_field_value(i, value->as_InlineTypeBase()->allocate_fields(kit));
603 } else if (value->is_InlineType()) {
604 // Non-flattened inline type field
605 vt->set_field_value(i, value->as_InlineType()->buffer(kit));
606 }
607 }
608 vt = kit->gvn().transform(vt)->as_InlineTypeBase();
609 kit->replace_in_map(this, vt);
610 return vt;
611 }
612
613 Node* InlineTypeBaseNode::Ideal(PhaseGVN* phase, bool can_reshape) {
614 Node* is_init = get_is_init();
615 if (is_init->isa_InlineTypePtr()) {
616 set_req(IsInit, is_init->as_InlineTypePtr()->get_is_init());
617 return this;
618 }
619 Node* oop = get_oop();
620 if (oop->isa_InlineTypePtr() && !phase->type(oop)->maybe_null()) {
621 InlineTypePtrNode* vtptr = oop->as_InlineTypePtr();
622 set_oop(vtptr->get_oop());
623 set_is_init(*phase);
624 for (uint i = Values; i < vtptr->req(); ++i) {
625 set_req(i, vtptr->in(i));
626 }
627 return this;
628 }
629 return NULL;
630 }
631
632 InlineTypeNode* InlineTypeNode::make_uninitialized(PhaseGVN& gvn, ciInlineKlass* vk) {
633 // Create a new InlineTypeNode with uninitialized values and NULL oop
634 Node* oop = (vk->is_empty() && vk->is_initialized()) ? default_oop(gvn, vk) : gvn.zerocon(T_PRIMITIVE_OBJECT);
635 InlineTypeNode* vt = new InlineTypeNode(vk, oop);
636 vt->set_is_init(gvn);
637 return vt;
638 }
639
640 Node* InlineTypeBaseNode::default_oop(PhaseGVN& gvn, ciInlineKlass* vk) {
641 // Returns the constant oop of the default inline type allocation
642 return gvn.makecon(TypeInstPtr::make(vk->default_instance()));
643 }
644
645 InlineTypeNode* InlineTypeNode::make_default(PhaseGVN& gvn, ciInlineKlass* vk) {
646 // Create a new InlineTypeNode with default values
647 Node* oop = vk->is_initialized() ? default_oop(gvn, vk) : gvn.zerocon(T_PRIMITIVE_OBJECT);
648 InlineTypeNode* vt = new InlineTypeNode(vk, oop);
649 vt->set_is_init(gvn);
650 for (uint i = 0; i < vt->field_count(); ++i) {
651 ciType* field_type = vt->field_type(i);
652 Node* value = gvn.zerocon(field_type->basic_type());
653 if (field_type->is_inlinetype()) {
654 ciInlineKlass* vk = field_type->as_inline_klass();
655 if (vt->field_is_null_free(i)) {
656 value = make_default(gvn, vk);
657 } else {
658 value = InlineTypePtrNode::make_null(gvn, vk);
659 }
660 }
661 vt->set_field_value(i, value);
662 }
663 vt = gvn.transform(vt)->as_InlineType();
664 assert(vt->is_default(&gvn), "must be the default inline type");
665 return vt;
666 }
667
668 InlineTypeNode* InlineTypeNode::make_null(PhaseGVN& gvn, ciInlineKlass* vk) {
669 InlineTypeNode* vt = new InlineTypeNode(vk, gvn.zerocon(T_OBJECT));
670 vt->set_req(IsInit, gvn.intcon(0));
671 for (uint i = 0; i < vt->field_count(); i++) {
672 ciType* field_type = vt->field_type(i);
673 Node* value = gvn.zerocon(field_type->basic_type());
674 if (field_type->is_inlinetype()) {
675 if (vt->field_is_null_free(i)) {
676 value = InlineTypeNode::make_null(gvn, field_type->as_inline_klass());
677 } else {
678 value = InlineTypePtrNode::make_null(gvn, field_type->as_inline_klass());
679 }
680 }
681 vt->set_field_value(i, value);
682 }
683 return gvn.transform(vt)->as_InlineType();
684 }
685
686 bool InlineTypeBaseNode::is_default(PhaseGVN* gvn) const {
687 const Type* tinit = gvn->type(in(IsInit));
688 if (!tinit->isa_int() || !tinit->is_int()->is_con(1)) {
689 return false; // May be null
690 }
691 for (uint i = 0; i < field_count(); ++i) {
692 Node* value = field_value(i);
693 if (value->is_InlineTypePtr()) {
694 value = value->as_InlineTypePtr()->get_oop();
695 }
696 if (!gvn->type(value)->is_zero_type() &&
697 !(field_is_null_free(i) && value->is_InlineType() && value->as_InlineType()->is_default(gvn))) {
698 return false;
699 }
700 }
701 return true;
702 }
703
704 InlineTypeBaseNode* InlineTypeNode::make_from_oop(GraphKit* kit, Node* oop, ciInlineKlass* vk, bool null_free) {
705 PhaseGVN& gvn = kit->gvn();
706
707 if (vk->is_empty() && null_free) {
708 InlineTypeNode* def = make_default(gvn, vk);
709 kit->record_for_igvn(def);
710 return def;
711 }
712 // Create and initialize an InlineTypeNode by loading all field
713 // values from a heap-allocated version and also save the oop.
714 InlineTypeBaseNode* vt = NULL;
715
716 if (oop->isa_InlineTypePtr()) {
717 return oop->as_InlineTypePtr();
718 } else if (gvn.type(oop)->maybe_null()) {
719 // Add a null check because the oop may be null
720 Node* null_ctl = kit->top();
721 Node* not_null_oop = kit->null_check_oop(oop, &null_ctl);
722 if (kit->stopped()) {
723 // Constant null
724 kit->set_control(null_ctl);
725 if (null_free) {
726 vt = make_default(gvn, vk);
727 } else {
728 vt = InlineTypePtrNode::make_null(gvn, vk);
729 }
730 kit->record_for_igvn(vt);
731 return vt;
732 }
733 vt = new InlineTypePtrNode(vk, not_null_oop, null_free);
734 vt->set_is_init(gvn);
735 vt->load(kit, not_null_oop, not_null_oop, vk, /* holder_offset */ 0);
736
737 if (null_ctl != kit->top()) {
738 InlineTypeBaseNode* null_vt = NULL;
739 if (null_free) {
740 null_vt = make_default(gvn, vk)->as_ptr(&gvn);
741 } else {
742 null_vt = InlineTypePtrNode::make_null(gvn, vk);
743 }
744 Node* region = new RegionNode(3);
745 region->init_req(1, kit->control());
746 region->init_req(2, null_ctl);
747
748 vt = vt->clone_with_phis(&gvn, region);
749 vt->merge_with(&gvn, null_vt, 2, true);
750 if (!null_free) {
751 vt->set_oop(oop);
752 }
753 kit->set_control(gvn.transform(region));
754 }
755 } else {
756 // Oop can never be null
757 vt = new InlineTypePtrNode(vk, oop, /* null_free= */ true);
758 Node* init_ctl = kit->control();
759 vt->set_is_init(gvn);
760 vt->load(kit, oop, oop, vk, /* holder_offset */ 0);
761 // TODO fix with JDK-8278390
762 // assert(!null_free || vt->as_InlineType()->is_default(&gvn) || init_ctl != kit->control() || !gvn.type(oop)->is_inlinetypeptr() || oop->is_Con() || oop->Opcode() == Op_InlineTypePtr ||
763 // AllocateNode::Ideal_allocation(oop, &gvn) != NULL || vt->as_InlineType()->is_loaded(&gvn) == oop, "inline type should be loaded");
764 }
765 assert(!null_free || vt->is_allocated(&gvn), "inline type should be allocated");
766 kit->record_for_igvn(vt);
767 return gvn.transform(vt)->as_InlineTypeBase();
768 }
769
770 // GraphKit wrapper for the 'make_from_flattened' method
771 InlineTypeNode* InlineTypeNode::make_from_flattened(GraphKit* kit, ciInlineKlass* vk, Node* obj, Node* ptr, ciInstanceKlass* holder, int holder_offset, DecoratorSet decorators) {
772 if (kit->gvn().type(obj)->isa_aryptr()) {
773 kit->C->set_flattened_accesses();
774 }
775 // Create and initialize an InlineTypeNode by loading all field values from
776 // a flattened inline type field at 'holder_offset' or from an inline type array.
777 InlineTypeNode* vt = make_uninitialized(kit->gvn(), vk);
778 // The inline type is flattened into the object without an oop header. Subtract the
779 // offset of the first field to account for the missing header when loading the values.
780 holder_offset -= vk->first_field_offset();
781 vt->load(kit, obj, ptr, holder, holder_offset, decorators);
782 assert(vt->is_loaded(&kit->gvn()) != obj, "holder oop should not be used as flattened inline type oop");
783 return kit->gvn().transform(vt)->as_InlineType();
784 }
785
786 InlineTypeBaseNode* InlineTypeNode::make_from_multi(GraphKit* kit, MultiNode* multi, ciInlineKlass* vk, uint& base_input, bool in, bool null_free) {
787 InlineTypeNode* vt = make_uninitialized(kit->gvn(), vk);
788 if (!in) {
789 // Keep track of the oop. The returned inline type might already be buffered.
790 Node* oop = kit->gvn().transform(new ProjNode(multi, base_input++));
791 vt->set_oop(oop);
792 }
793 vt->initialize_fields(kit, multi, base_input, in, null_free);
794 return kit->gvn().transform(vt)->as_InlineTypeBase();
795 }
796
797 InlineTypeNode* InlineTypeBaseNode::make_larval(GraphKit* kit, bool allocate) const {
798 ciInlineKlass* vk = inline_klass();
799 InlineTypeNode* res = InlineTypeNode::make_uninitialized(kit->gvn(), vk);
800 for (uint i = 1; i < req(); ++i) {
801 res->set_req(i, in(i));
802 }
803
804 if (allocate) {
805 // Re-execute if buffering triggers deoptimization
806 PreserveReexecuteState preexecs(kit);
807 kit->jvms()->set_should_reexecute(true);
808 Node* klass_node = kit->makecon(TypeKlassPtr::make(vk));
809 Node* alloc_oop = kit->new_instance(klass_node, NULL, NULL, true);
810 AllocateNode* alloc = AllocateNode::Ideal_allocation(alloc_oop, &kit->gvn());
811 alloc->_larval = true;
812
813 store(kit, alloc_oop, alloc_oop, vk);
814 res->set_oop(alloc_oop);
815 }
816 res->set_type(TypeInlineType::make(vk, true));
817 res = kit->gvn().transform(res)->as_InlineType();
818 assert(!allocate || res->is_allocated(&kit->gvn()), "must be allocated");
819 return res;
820 }
821
822 InlineTypeNode* InlineTypeBaseNode::finish_larval(GraphKit* kit) const {
823 Node* obj = get_oop();
824 Node* mark_addr = kit->basic_plus_adr(obj, oopDesc::mark_offset_in_bytes());
825 Node* mark = kit->make_load(NULL, mark_addr, TypeX_X, TypeX_X->basic_type(), MemNode::unordered);
826 mark = kit->gvn().transform(new AndXNode(mark, kit->MakeConX(~markWord::larval_bit_in_place)));
827 kit->store_to_memory(kit->control(), mark_addr, mark, TypeX_X->basic_type(), kit->gvn().type(mark_addr)->is_ptr(), MemNode::unordered);
828
829 // Do not let stores that initialize this buffer be reordered with a subsequent
830 // store that would make this buffer accessible by other threads.
831 AllocateNode* alloc = AllocateNode::Ideal_allocation(obj, &kit->gvn());
832 assert(alloc != NULL, "must have an allocation node");
833 kit->insert_mem_bar(Op_MemBarStoreStore, alloc->proj_out_or_null(AllocateNode::RawAddress));
834
835 ciInlineKlass* vk = inline_klass();
836 InlineTypeNode* res = InlineTypeNode::make_uninitialized(kit->gvn(), vk);
837 for (uint i = 1; i < req(); ++i) {
838 res->set_req(i, in(i));
839 }
840 res->set_type(TypeInlineType::make(vk, false));
841 res = kit->gvn().transform(res)->as_InlineType();
842 return res;
843 }
844
845 Node* InlineTypeNode::is_loaded(PhaseGVN* phase, ciInlineKlass* vk, Node* base, int holder_offset) {
846 if (vk == NULL) {
847 vk = inline_klass();
848 }
849 if (field_count() == 0 && vk->is_initialized()) {
850 const Type* tinit = phase->type(in(IsInit));
851 if (tinit->isa_int() && tinit->is_int()->is_con(1)) {
852 assert(is_allocated(phase), "must be allocated");
853 return get_oop();
854 } else {
855 // TODO 8284443
856 return NULL;
857 }
858 }
859 for (uint i = 0; i < field_count(); ++i) {
860 int offset = holder_offset + field_offset(i);
861 Node* value = field_value(i);
862 if (value->is_InlineTypeBase()) {
863 InlineTypeBaseNode* vt = value->as_InlineTypeBase();
864 if (vt->type()->inline_klass()->is_empty()) {
865 continue;
866 } else if (field_is_flattened(i) && vt->is_InlineType()) {
867 // Check inline type field load recursively
868 base = vt->as_InlineType()->is_loaded(phase, vk, base, offset - vt->type()->inline_klass()->first_field_offset());
869 if (base == NULL) {
870 return NULL;
871 }
872 continue;
873 } else {
874 value = vt->get_oop();
875 if (value->Opcode() == Op_CastPP) {
876 // Skip CastPP
877 value = value->in(1);
878 }
879 }
880 }
881 if (value->isa_DecodeN()) {
882 // Skip DecodeN
883 value = value->in(1);
884 }
885 if (value->isa_Load()) {
886 // Check if base and offset of field load matches inline type layout
887 intptr_t loffset = 0;
888 Node* lbase = AddPNode::Ideal_base_and_offset(value->in(MemNode::Address), phase, loffset);
889 if (lbase == NULL || (lbase != base && base != NULL) || loffset != offset) {
890 return NULL;
891 } else if (base == NULL) {
892 // Set base and check if pointer type matches
893 base = lbase;
894 const TypeInstPtr* vtptr = phase->type(base)->isa_instptr();
895 if (vtptr == NULL || !vtptr->instance_klass()->equals(vk)) {
896 return NULL;
897 }
898 }
899 } else {
900 return NULL;
901 }
902 }
903 return base;
904 }
905
906 Node* InlineTypeBaseNode::tagged_klass(ciInlineKlass* vk, PhaseGVN& gvn) {
907 const TypeKlassPtr* tk = TypeKlassPtr::make(vk);
908 intptr_t bits = tk->get_con();
909 set_nth_bit(bits, 0);
910 return gvn.longcon((jlong)bits);
911 }
912
913 void InlineTypeBaseNode::pass_fields(GraphKit* kit, Node* n, uint& base_input, bool in, bool null_free) {
914 if (!null_free && in) {
915 n->init_req(base_input++, get_is_init());
916 }
917 for (uint i = 0; i < field_count(); i++) {
918 Node* arg = field_value(i);
919 if (field_is_flattened(i)) {
920 // Flattened inline type field
921 arg->as_InlineTypeBase()->pass_fields(kit, n, base_input, in);
922 } else {
923 if (arg->is_InlineType()) {
924 // Non-flattened inline type field
925 InlineTypeNode* vt = arg->as_InlineType();
926 assert(n->Opcode() != Op_Return || vt->is_allocated(&kit->gvn()), "inline type field should be allocated on return");
927 arg = vt->buffer(kit);
928 }
929 // Initialize call/return arguments
930 n->init_req(base_input++, arg);
931 if (field_type(i)->size() == 2) {
932 n->init_req(base_input++, kit->top());
933 }
934 }
935 }
936 // The last argument is used to pass IsInit information to compiled code and not required here.
937 if (!null_free && !in) {
938 n->init_req(base_input++, kit->top());
939 }
940 }
941
942 void InlineTypeNode::initialize_fields(GraphKit* kit, MultiNode* multi, uint& base_input, bool in, bool null_free, Node* null_check_region) {
943 PhaseGVN& gvn = kit->gvn();
944 Node* is_init = NULL;
945 if (!null_free) {
946 // Nullable inline type
947 if (in) {
948 // Set IsInit field
949 if (multi->is_Start()) {
950 is_init = gvn.transform(new ParmNode(multi->as_Start(), base_input));
951 } else {
952 is_init = multi->as_Call()->in(base_input);
953 }
954 set_req(IsInit, is_init);
955 base_input++;
956 }
957 // Add a null check to make subsequent loads dependent on
958 assert(null_check_region == NULL, "already set");
959 if (is_init == NULL) {
960 // Will only be initialized below, use dummy node for now
961 is_init = new Node(1);
962 gvn.set_type_bottom(is_init);
963 }
964 Node* null_ctrl = kit->top();
965 kit->null_check_common(is_init, T_INT, false, &null_ctrl);
966 Node* non_null_ctrl = kit->control();
967 null_check_region = new RegionNode(3);
968 null_check_region->init_req(1, non_null_ctrl);
969 null_check_region->init_req(2, null_ctrl);
970 null_check_region = gvn.transform(null_check_region);
971 kit->set_control(null_check_region);
972 }
973
974 for (uint i = 0; i < field_count(); ++i) {
975 ciType* type = field_type(i);
976 Node* parm = NULL;
977 if (field_is_flattened(i)) {
978 // Flattened inline type field
979 InlineTypeNode* vt = make_uninitialized(gvn, type->as_inline_klass());
980 vt->initialize_fields(kit, multi, base_input, in, true, null_check_region);
981 parm = gvn.transform(vt);
982 } else {
983 if (multi->is_Start()) {
984 assert(in, "return from start?");
985 parm = gvn.transform(new ParmNode(multi->as_Start(), base_input));
986 } else if (in) {
987 parm = multi->as_Call()->in(base_input);
988 } else {
989 parm = gvn.transform(new ProjNode(multi->as_Call(), base_input));
990 }
991 // Non-flattened inline type field
992 if (type->is_inlinetype()) {
993 if (null_check_region != NULL) {
994 // Holder is nullable, set field to NULL if holder is NULL to avoid loading from uninitialized memory
995 parm = PhiNode::make(null_check_region, parm, TypeInstPtr::make(TypePtr::BotPTR, type->as_inline_klass()));
996 parm->set_req(2, kit->zerocon(T_OBJECT));
997 parm = gvn.transform(parm);
998 }
999 parm = make_from_oop(kit, parm, type->as_inline_klass(), field_is_null_free(i));
1000 }
1001 base_input += type->size();
1002 }
1003 assert(parm != NULL, "should never be null");
1004 assert(field_value(i) == NULL, "already set");
1005 set_field_value(i, parm);
1006 gvn.record_for_igvn(parm);
1007 }
1008 // The last argument is used to pass IsInit information to compiled code
1009 if (!null_free && !in) {
1010 Node* cmp = is_init->raw_out(0);
1011 is_init= gvn.transform(new ProjNode(multi->as_Call(), base_input));
1012 set_req(IsInit, is_init);
1013 gvn.hash_delete(cmp);
1014 cmp->set_req(1, is_init);
1015 gvn.hash_find_insert(cmp);
1016 base_input++;
1017 }
1018 }
1019
1020 // Replace a buffer allocation by a dominating allocation
1021 static void replace_allocation(PhaseIterGVN* igvn, Node* res, Node* dom) {
1022 // Remove initializing stores and GC barriers
1023 for (DUIterator_Fast imax, i = res->fast_outs(imax); i < imax; i++) {
1024 Node* use = res->fast_out(i);
1025 if (use->is_AddP()) {
1026 for (DUIterator_Fast jmax, j = use->fast_outs(jmax); j < jmax; j++) {
1027 Node* store = use->fast_out(j)->isa_Store();
1028 if (store != NULL) {
1029 igvn->rehash_node_delayed(store);
1030 igvn->replace_in_uses(store, store->in(MemNode::Memory));
1031 }
1032 }
1033 } else if (use->Opcode() == Op_CastP2X) {
1034 if (UseG1GC && use->find_out_with(Op_XorX)->in(1) != use) {
1035 // The G1 pre-barrier uses a CastP2X both for the pointer of the object
1036 // we store into, as well as the value we are storing. Skip if this is a
1037 // barrier for storing 'res' into another object.
1038 continue;
1039 }
1040 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1041 bs->eliminate_gc_barrier(igvn, use);
1042 --i; --imax;
1043 }
1044 }
1045 igvn->replace_node(res, dom);
1046 }
1047
1048 Node* InlineTypeNode::Ideal(PhaseGVN* phase, bool can_reshape) {
1049 Node* oop = get_oop();
1050 if (is_default(phase) && inline_klass()->is_initialized() &&
1051 (!oop->is_Con() || phase->type(oop)->is_zero_type())) {
1052 // Use the pre-allocated oop for default inline types
1053 set_oop(default_oop(*phase, inline_klass()));
1054 assert(is_allocated(phase), "should now be allocated");
1055 return this;
1056 }
1057
1058 if (!is_allocated(phase)) {
1059 // Save base oop if fields are loaded from memory and the inline
1060 // type is not buffered (in this case we should not use the oop).
1061 Node* base = is_loaded(phase);
1062 if (base != NULL && !phase->type(base)->maybe_null()) {
1063 set_oop(base);
1064 assert(is_allocated(phase), "should now be allocated");
1065 return this;
1066 }
1067 }
1068
1069 if (can_reshape) {
1070 PhaseIterGVN* igvn = phase->is_IterGVN();
1071
1072 if (is_allocated(phase)) {
1073 // Search for and remove re-allocations of this inline type. Ignore scalar replaceable ones,
1074 // they will be removed anyway and changing the memory chain will confuse other optimizations.
1075 // This can happen with late inlining when we first allocate an inline type argument
1076 // but later decide to inline the call after the callee code also triggered allocation.
1077 for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) {
1078 AllocateNode* alloc = fast_out(i)->isa_Allocate();
1079 if (alloc != NULL && alloc->in(AllocateNode::InlineTypeNode) == this && !alloc->_is_scalar_replaceable) {
1080 // Found a re-allocation
1081 Node* res = alloc->result_cast();
1082 if (res != NULL && res->is_CheckCastPP()) {
1083 // Replace allocation by oop and unlink AllocateNode
1084 replace_allocation(igvn, res, oop);
1085 igvn->replace_input_of(alloc, AllocateNode::InlineTypeNode, igvn->C->top());
1086 --i; --imax;
1087 }
1088 }
1089 }
1090 }
1091 }
1092 return InlineTypeBaseNode::Ideal(phase, can_reshape);
1093 }
1094
1095 // Search for multiple allocations of this inline type and try to replace them by dominating allocations.
1096 void InlineTypeNode::remove_redundant_allocations(PhaseIterGVN* igvn, PhaseIdealLoop* phase) {
1097 // Search for allocations of this inline type. Ignore scalar replaceable ones, they
1098 // will be removed anyway and changing the memory chain will confuse other optimizations.
1099 for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) {
1100 AllocateNode* alloc = fast_out(i)->isa_Allocate();
1101 if (alloc != NULL && alloc->in(AllocateNode::InlineTypeNode) == this && !alloc->_is_scalar_replaceable) {
1102 Node* res = alloc->result_cast();
1103 if (res == NULL || !res->is_CheckCastPP()) {
1104 break; // No unique CheckCastPP
1105 }
1106 assert((!is_default(igvn) || !inline_klass()->is_initialized()) && !is_allocated(igvn), "re-allocation should be removed by Ideal transformation");
1107 // Search for a dominating allocation of the same inline type
1108 Node* res_dom = res;
1109 for (DUIterator_Fast jmax, j = fast_outs(jmax); j < jmax; j++) {
1110 AllocateNode* alloc_other = fast_out(j)->isa_Allocate();
1111 if (alloc_other != NULL && alloc_other->in(AllocateNode::InlineTypeNode) == this && !alloc_other->_is_scalar_replaceable) {
1112 Node* res_other = alloc_other->result_cast();
1113 if (res_other != NULL && res_other->is_CheckCastPP() && res_other != res_dom &&
1114 phase->is_dominator(res_other->in(0), res_dom->in(0))) {
1115 res_dom = res_other;
1116 }
1117 }
1118 }
1119 if (res_dom != res) {
1120 // Replace allocation by dominating one.
1121 replace_allocation(igvn, res, res_dom);
1122 // The result of the dominated allocation is now unused and will be removed
1123 // later in PhaseMacroExpand::eliminate_allocate_node to not confuse loop opts.
1124 igvn->_worklist.push(alloc);
1125 }
1126 }
1127 }
1128
1129 // Process users
1130 for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) {
1131 Node* out = fast_out(i);
1132 if (out->is_InlineType()) {
1133 // Recursively process inline type users
1134 igvn->rehash_node_delayed(out);
1135 out->as_InlineType()->remove_redundant_allocations(igvn, phase);
1136 } else if (out->isa_Allocate() != NULL) {
1137 // Unlink AllocateNode
1138 assert(out->in(AllocateNode::InlineTypeNode) == this, "should be linked");
1139 igvn->replace_input_of(out, AllocateNode::InlineTypeNode, igvn->C->top());
1140 --i; --imax;
1141 }
1142 }
1143 }
1144
1145 InlineTypePtrNode* InlineTypePtrNode::make_null(PhaseGVN& gvn, ciInlineKlass* vk) {
1146 InlineTypePtrNode* ptr = new InlineTypePtrNode(vk, gvn.zerocon(T_OBJECT), /* null_free= */ false);
1147 ptr->set_req(IsInit, gvn.intcon(0));
1148 for (uint i = 0; i < ptr->field_count(); i++) {
1149 ciType* field_type = ptr->field_type(i);
1150 Node* value = gvn.zerocon(field_type->basic_type());
1151 if (field_type->is_inlinetype()) {
1152 if (ptr->field_is_null_free(i)) {
1153 value = InlineTypeNode::make_null(gvn, field_type->as_inline_klass());
1154 } else {
1155 value = InlineTypePtrNode::make_null(gvn, field_type->as_inline_klass());
1156 }
1157 }
1158 ptr->set_field_value(i, value);
1159 }
1160 return gvn.transform(ptr)->as_InlineTypePtr();
1161 }
1162
1163 Node* InlineTypePtrNode::Identity(PhaseGVN* phase) {
1164 if (get_oop()->is_InlineTypePtr()) {
1165 return get_oop();
1166 }
1167 return this;
1168 }
1169
1170 const Type* InlineTypePtrNode::Value(PhaseGVN* phase) const {
1171 const Type* t = phase->type(get_oop())->filter_speculative(_type);
1172 if (t->singleton()) {
1173 // Don't replace InlineTypePtr by a constant
1174 t = _type;
1175 }
1176 const Type* tinit = phase->type(in(IsInit));
1177 if (tinit->isa_int() && tinit->is_int()->is_con(1)) {
1178 t = t->join_speculative(TypePtr::NOTNULL);
1179 }
1180 return t;
1181 }