1 /*
2 * Copyright (c) 2016, 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 "opto/arraycopynode.hpp"
27 #include "opto/graphKit.hpp"
28 #include "runtime/sharedRuntime.hpp"
29
30 ArrayCopyNode::ArrayCopyNode(Compile* C, bool alloc_tightly_coupled, bool has_negative_length_guard)
31 : CallNode(arraycopy_type(), NULL, TypeRawPtr::BOTTOM),
32 _alloc_tightly_coupled(alloc_tightly_coupled),
33 _has_negative_length_guard(has_negative_length_guard),
34 _kind(None),
35 _arguments_validated(false),
36 _src_type(TypeOopPtr::BOTTOM),
37 _dest_type(TypeOopPtr::BOTTOM) {
38 init_class_id(Class_ArrayCopy);
39 init_flags(Flag_is_macro);
40 C->add_macro_node(this);
41 }
42
43 uint ArrayCopyNode::size_of() const { return sizeof(*this); }
44
45 ArrayCopyNode* ArrayCopyNode::make(GraphKit* kit, bool may_throw,
46 Node* src, Node* src_offset,
47 Node* dest, Node* dest_offset,
48 Node* length,
49 bool alloc_tightly_coupled,
50 bool has_negative_length_guard,
51 Node* src_klass, Node* dest_klass,
52 Node* src_length, Node* dest_length) {
53
54 ArrayCopyNode* ac = new ArrayCopyNode(kit->C, alloc_tightly_coupled, has_negative_length_guard);
55 Node* prev_mem = kit->set_predefined_input_for_runtime_call(ac);
56
57 ac->init_req(ArrayCopyNode::Src, src);
58 ac->init_req(ArrayCopyNode::SrcPos, src_offset);
59 ac->init_req(ArrayCopyNode::Dest, dest);
60 ac->init_req(ArrayCopyNode::DestPos, dest_offset);
61 ac->init_req(ArrayCopyNode::Length, length);
62 ac->init_req(ArrayCopyNode::SrcLen, src_length);
63 ac->init_req(ArrayCopyNode::DestLen, dest_length);
64 ac->init_req(ArrayCopyNode::SrcKlass, src_klass);
65 ac->init_req(ArrayCopyNode::DestKlass, dest_klass);
66
67 if (may_throw) {
68 ac->set_req(TypeFunc::I_O , kit->i_o());
69 kit->add_safepoint_edges(ac, false);
70 }
71
72 return ac;
73 }
74
75 void ArrayCopyNode::connect_outputs(GraphKit* kit) {
76 kit->set_all_memory_call(this, true);
77 kit->set_control(kit->gvn().transform(new ProjNode(this,TypeFunc::Control)));
78 kit->set_i_o(kit->gvn().transform(new ProjNode(this, TypeFunc::I_O)));
79 kit->make_slow_call_ex(this, kit->env()->Throwable_klass(), true);
80 kit->set_all_memory_call(this);
81 }
82
83 #ifndef PRODUCT
84 const char* ArrayCopyNode::_kind_names[] = {"arraycopy", "arraycopy, validated arguments", "clone", "oop array clone", "CopyOf", "CopyOfRange"};
85
86 void ArrayCopyNode::dump_spec(outputStream *st) const {
87 CallNode::dump_spec(st);
88 st->print(" (%s%s)", _kind_names[_kind], _alloc_tightly_coupled ? ", tightly coupled allocation" : "");
89 }
90
91 void ArrayCopyNode::dump_compact_spec(outputStream* st) const {
92 st->print("%s%s", _kind_names[_kind], _alloc_tightly_coupled ? ",tight" : "");
93 }
94 #endif
95
96 intptr_t ArrayCopyNode::get_length_if_constant(PhaseGVN *phase) const {
97 // check that length is constant
98 Node* length = in(ArrayCopyNode::Length);
99 const Type* length_type = phase->type(length);
100
101 if (length_type == Type::TOP) {
102 return -1;
103 }
104
105 assert(is_clonebasic() || is_arraycopy() || is_copyof() || is_copyofrange(), "unexpected array copy type");
106
107 return is_clonebasic() ? length->find_intptr_t_con(-1) : length->find_int_con(-1);
108 }
109
110 int ArrayCopyNode::get_count(PhaseGVN *phase) const {
111 Node* src = in(ArrayCopyNode::Src);
112 const Type* src_type = phase->type(src);
113
114 if (is_clonebasic()) {
115 if (src_type->isa_instptr()) {
116 const TypeInstPtr* inst_src = src_type->is_instptr();
117 ciInstanceKlass* ik = inst_src->klass()->as_instance_klass();
118 // ciInstanceKlass::nof_nonstatic_fields() doesn't take injected
119 // fields into account. They are rare anyway so easier to simply
120 // skip instances with injected fields.
121 if ((!inst_src->klass_is_exact() && (ik->is_interface() || ik->has_subklass())) || ik->has_injected_fields()) {
122 return -1;
123 }
124 int nb_fields = ik->nof_nonstatic_fields();
125 return nb_fields;
126 } else {
127 const TypeAryPtr* ary_src = src_type->isa_aryptr();
128 assert (ary_src != NULL, "not an array or instance?");
129 // clone passes a length as a rounded number of longs. If we're
130 // cloning an array we'll do it element by element. If the
131 // length input to ArrayCopyNode is constant, length of input
132 // array must be too.
133
134 assert((get_length_if_constant(phase) == -1) == !ary_src->size()->is_con() ||
135 phase->is_IterGVN(), "inconsistent");
136
137 if (ary_src->size()->is_con()) {
138 return ary_src->size()->get_con();
139 }
140 return -1;
141 }
142 }
143
144 return get_length_if_constant(phase);
145 }
146
147 Node* ArrayCopyNode::try_clone_instance(PhaseGVN *phase, bool can_reshape, int count) {
148 if (!is_clonebasic()) {
149 return NULL;
150 }
151
152 Node* src = in(ArrayCopyNode::Src);
153 Node* dest = in(ArrayCopyNode::Dest);
154 Node* ctl = in(TypeFunc::Control);
155 Node* in_mem = in(TypeFunc::Memory);
156
157 const Type* src_type = phase->type(src);
158
159 assert(src->is_AddP(), "should be base + off");
160 assert(dest->is_AddP(), "should be base + off");
161 Node* base_src = src->in(AddPNode::Base);
162 Node* base_dest = dest->in(AddPNode::Base);
163
164 MergeMemNode* mem = MergeMemNode::make(in_mem);
165
166 const TypeInstPtr* inst_src = src_type->isa_instptr();
167
168 if (inst_src == NULL) {
169 return NULL;
170 }
171
172 if (!inst_src->klass_is_exact()) {
173 ciInstanceKlass* ik = inst_src->klass()->as_instance_klass();
174 assert(!ik->is_interface() && !ik->has_subklass(), "inconsistent klass hierarchy");
175 phase->C->dependencies()->assert_leaf_type(ik);
176 }
177
178 ciInstanceKlass* ik = inst_src->klass()->as_instance_klass();
179 assert(ik->nof_nonstatic_fields() <= ArrayCopyLoadStoreMaxElem, "too many fields");
180
181 for (int i = 0; i < count; i++) {
182 ciField* field = ik->nonstatic_field_at(i);
183 int fieldidx = phase->C->alias_type(field)->index();
184 const TypePtr* adr_type = phase->C->alias_type(field)->adr_type();
185 Node* off = phase->MakeConX(field->offset());
186 Node* next_src = phase->transform(new AddPNode(base_src,base_src,off));
187 Node* next_dest = phase->transform(new AddPNode(base_dest,base_dest,off));
188 BasicType bt = field->layout_type();
189
190 const Type *type;
191 if (bt == T_OBJECT) {
192 if (!field->type()->is_loaded()) {
193 type = TypeInstPtr::BOTTOM;
194 } else {
195 ciType* field_klass = field->type();
196 type = TypeOopPtr::make_from_klass(field_klass->as_klass());
197 }
198 } else {
199 type = Type::get_const_basic_type(bt);
200 }
201
202 Node* v = LoadNode::make(*phase, ctl, mem->memory_at(fieldidx), next_src, adr_type, type, bt, MemNode::unordered);
203 v = phase->transform(v);
204 Node* s = StoreNode::make(*phase, ctl, mem->memory_at(fieldidx), next_dest, adr_type, v, bt, MemNode::unordered);
205 s = phase->transform(s);
206 mem->set_memory_at(fieldidx, s);
207 }
208
209 if (!finish_transform(phase, can_reshape, ctl, mem)) {
210 // Return NodeSentinel to indicate that the transform failed
211 return NodeSentinel;
212 }
213
214 return mem;
215 }
216
217 bool ArrayCopyNode::prepare_array_copy(PhaseGVN *phase, bool can_reshape,
218 Node*& adr_src,
219 Node*& base_src,
220 Node*& adr_dest,
221 Node*& base_dest,
222 BasicType& copy_type,
223 const Type*& value_type,
224 bool& disjoint_bases) {
225 Node* src = in(ArrayCopyNode::Src);
226 Node* dest = in(ArrayCopyNode::Dest);
227 const Type* src_type = phase->type(src);
228 const TypeAryPtr* ary_src = src_type->isa_aryptr();
229
230 if (is_arraycopy() || is_copyofrange() || is_copyof()) {
231 const Type* dest_type = phase->type(dest);
232 const TypeAryPtr* ary_dest = dest_type->isa_aryptr();
233 Node* src_offset = in(ArrayCopyNode::SrcPos);
234 Node* dest_offset = in(ArrayCopyNode::DestPos);
235
236 // newly allocated object is guaranteed to not overlap with source object
237 disjoint_bases = is_alloc_tightly_coupled();
238
239 if (ary_src == NULL || ary_src->klass() == NULL ||
240 ary_dest == NULL || ary_dest->klass() == NULL) {
241 // We don't know if arguments are arrays
242 return false;
243 }
244
245 BasicType src_elem = ary_src->klass()->as_array_klass()->element_type()->basic_type();
246 BasicType dest_elem = ary_dest->klass()->as_array_klass()->element_type()->basic_type();
247 if (src_elem == T_ARRAY) src_elem = T_OBJECT;
248 if (dest_elem == T_ARRAY) dest_elem = T_OBJECT;
249
250 if (src_elem != dest_elem || dest_elem == T_VOID) {
251 // We don't know if arguments are arrays of the same type
252 return false;
253 }
254
255 if (dest_elem == T_OBJECT && (!is_alloc_tightly_coupled() || !GraphKit::use_ReduceInitialCardMarks())) {
256 // It's an object array copy but we can't emit the card marking
257 // that is needed
258 return false;
259 }
260
261 value_type = ary_src->elem();
262
263 base_src = src;
264 base_dest = dest;
265
266 uint shift = exact_log2(type2aelembytes(dest_elem));
267 uint header = arrayOopDesc::base_offset_in_bytes(dest_elem);
268
269 adr_src = src;
270 adr_dest = dest;
271
272 src_offset = Compile::conv_I2X_index(phase, src_offset, ary_src->size());
273 dest_offset = Compile::conv_I2X_index(phase, dest_offset, ary_dest->size());
274
275 Node* src_scale = phase->transform(new LShiftXNode(src_offset, phase->intcon(shift)));
276 Node* dest_scale = phase->transform(new LShiftXNode(dest_offset, phase->intcon(shift)));
277
278 adr_src = phase->transform(new AddPNode(base_src, adr_src, src_scale));
279 adr_dest = phase->transform(new AddPNode(base_dest, adr_dest, dest_scale));
280
281 adr_src = new AddPNode(base_src, adr_src, phase->MakeConX(header));
282 adr_dest = new AddPNode(base_dest, adr_dest, phase->MakeConX(header));
283
284 adr_src = phase->transform(adr_src);
285 adr_dest = phase->transform(adr_dest);
286
287 copy_type = dest_elem;
288 } else {
289 assert(ary_src != NULL, "should be a clone");
290 assert(is_clonebasic(), "should be");
291
292 disjoint_bases = true;
293 assert(src->is_AddP(), "should be base + off");
294 assert(dest->is_AddP(), "should be base + off");
295 adr_src = src;
296 base_src = src->in(AddPNode::Base);
297 adr_dest = dest;
298 base_dest = dest->in(AddPNode::Base);
299
300 assert(phase->type(src->in(AddPNode::Offset))->is_intptr_t()->get_con() == phase->type(dest->in(AddPNode::Offset))->is_intptr_t()->get_con(), "same start offset?");
301 BasicType elem = ary_src->klass()->as_array_klass()->element_type()->basic_type();
302 if (elem == T_ARRAY) elem = T_OBJECT;
303
304 int diff = arrayOopDesc::base_offset_in_bytes(elem) - phase->type(src->in(AddPNode::Offset))->is_intptr_t()->get_con();
305 assert(diff >= 0, "clone should not start after 1st array element");
306 if (diff > 0) {
307 adr_src = phase->transform(new AddPNode(base_src, adr_src, phase->MakeConX(diff)));
308 adr_dest = phase->transform(new AddPNode(base_dest, adr_dest, phase->MakeConX(diff)));
309 }
310
311 copy_type = elem;
312 value_type = ary_src->elem();
313 }
314 return true;
315 }
316
317 const TypePtr* ArrayCopyNode::get_address_type(PhaseGVN *phase, Node* n) {
318 const Type* at = phase->type(n);
319 assert(at != Type::TOP, "unexpected type");
320 const TypePtr* atp = at->isa_ptr();
321 // adjust atp to be the correct array element address type
322 atp = atp->add_offset(Type::OffsetBot);
323 return atp;
324 }
325
326 void ArrayCopyNode::array_copy_test_overlap(PhaseGVN *phase, bool can_reshape, bool disjoint_bases, int count, Node*& forward_ctl, Node*& backward_ctl) {
327 Node* ctl = in(TypeFunc::Control);
328 if (!disjoint_bases && count > 1) {
329 Node* src_offset = in(ArrayCopyNode::SrcPos);
330 Node* dest_offset = in(ArrayCopyNode::DestPos);
331 assert(src_offset != NULL && dest_offset != NULL, "should be");
332 Node* cmp = phase->transform(new CmpINode(src_offset, dest_offset));
333 Node *bol = phase->transform(new BoolNode(cmp, BoolTest::lt));
334 IfNode *iff = new IfNode(ctl, bol, PROB_FAIR, COUNT_UNKNOWN);
335
336 phase->transform(iff);
337
338 forward_ctl = phase->transform(new IfFalseNode(iff));
339 backward_ctl = phase->transform(new IfTrueNode(iff));
340 } else {
341 forward_ctl = ctl;
342 }
343 }
344
345 Node* ArrayCopyNode::array_copy_forward(PhaseGVN *phase,
346 bool can_reshape,
347 Node* forward_ctl,
348 Node* start_mem_src,
349 Node* start_mem_dest,
350 const TypePtr* atp_src,
351 const TypePtr* atp_dest,
352 Node* adr_src,
353 Node* base_src,
354 Node* adr_dest,
355 Node* base_dest,
356 BasicType copy_type,
357 const Type* value_type,
358 int count) {
359 Node* mem = phase->C->top();
360 if (!forward_ctl->is_top()) {
361 // copy forward
362 mem = start_mem_dest;
363
364 // FYI: linked LoadUBs/StoreBs are created here
365 if (count > 0) {
366 Node* v = LoadNode::make(*phase, forward_ctl, start_mem_src, adr_src, atp_src, value_type, copy_type, MemNode::unordered);
367 v = phase->transform(v);
368 mem = StoreNode::make(*phase, forward_ctl, mem, adr_dest, atp_dest, v, copy_type, MemNode::unordered);
369 mem = phase->transform(mem);
370 for (int i = 1; i < count; i++) {
371 Node* off = phase->MakeConX(type2aelembytes(copy_type) * i);
372 Node* next_src = phase->transform(new AddPNode(base_src,adr_src,off));
373 Node* next_dest = phase->transform(new AddPNode(base_dest,adr_dest,off));
374 v = LoadNode::make(*phase, forward_ctl, mem, next_src, atp_src, value_type, copy_type, MemNode::unordered);
375 v = phase->transform(v);
376 mem = StoreNode::make(*phase, forward_ctl,mem,next_dest,atp_dest,v, copy_type, MemNode::unordered);
377 mem = phase->transform(mem);
378 }
379 } else if(can_reshape) {
380 PhaseIterGVN* igvn = phase->is_IterGVN();
381 igvn->_worklist.push(adr_src);
382 igvn->_worklist.push(adr_dest);
383 }
384 }
385 return mem;
386 }
387
388 Node* ArrayCopyNode::array_copy_backward(PhaseGVN *phase,
389 bool can_reshape,
390 Node* backward_ctl,
391 Node* start_mem_src,
392 Node* start_mem_dest,
393 const TypePtr* atp_src,
394 const TypePtr* atp_dest,
395 Node* adr_src,
396 Node* base_src,
397 Node* adr_dest,
398 Node* base_dest,
399 BasicType copy_type,
400 const Type* value_type,
401 int count) {
402 Node* mem = phase->C->top();
403 if (!backward_ctl->is_top()) {
404 // copy backward
405 mem = start_mem_dest;
406
407 if (count > 0) {
408 for (int i = count-1; i >= 1; i--) {
409 Node* off = phase->MakeConX(type2aelembytes(copy_type) * i);
410 Node* next_src = phase->transform(new AddPNode(base_src,adr_src,off));
411 Node* next_dest = phase->transform(new AddPNode(base_dest,adr_dest,off));
412 Node* v = LoadNode::make(*phase, backward_ctl, mem, next_src, atp_src, value_type, copy_type, MemNode::unordered);
413 v = phase->transform(v);
414 mem = StoreNode::make(*phase, backward_ctl,mem,next_dest,atp_dest,v, copy_type, MemNode::unordered);
415 mem = phase->transform(mem);
416 }
417 Node* v = LoadNode::make(*phase, backward_ctl, mem, adr_src, atp_src, value_type, copy_type, MemNode::unordered);
418 v = phase->transform(v);
419 mem = StoreNode::make(*phase, backward_ctl, mem, adr_dest, atp_dest, v, copy_type, MemNode::unordered);
420 mem = phase->transform(mem);
421 } else if(can_reshape) {
422 PhaseIterGVN* igvn = phase->is_IterGVN();
423 igvn->_worklist.push(adr_src);
424 igvn->_worklist.push(adr_dest);
425 }
426 }
427 return mem;
428 }
429
430 bool ArrayCopyNode::finish_transform(PhaseGVN *phase, bool can_reshape,
431 Node* ctl, Node *mem) {
432 if (can_reshape) {
433 PhaseIterGVN* igvn = phase->is_IterGVN();
434 igvn->set_delay_transform(false);
435 if (is_clonebasic()) {
436 Node* out_mem = proj_out(TypeFunc::Memory);
437
438 if (out_mem->outcnt() != 1 || !out_mem->raw_out(0)->is_MergeMem() ||
439 out_mem->raw_out(0)->outcnt() != 1 || !out_mem->raw_out(0)->raw_out(0)->is_MemBar()) {
440 assert(!GraphKit::use_ReduceInitialCardMarks(), "can only happen with card marking");
441 return false;
442 }
443
444 igvn->replace_node(out_mem->raw_out(0), mem);
445
446 Node* out_ctl = proj_out(TypeFunc::Control);
447 igvn->replace_node(out_ctl, ctl);
448 } else {
449 // replace fallthrough projections of the ArrayCopyNode by the
450 // new memory, control and the input IO.
451 CallProjections callprojs;
452 extract_projections(&callprojs, true, false);
453
454 if (callprojs.fallthrough_ioproj != NULL) {
455 igvn->replace_node(callprojs.fallthrough_ioproj, in(TypeFunc::I_O));
456 }
457 if (callprojs.fallthrough_memproj != NULL) {
458 igvn->replace_node(callprojs.fallthrough_memproj, mem);
459 }
460 if (callprojs.fallthrough_catchproj != NULL) {
461 igvn->replace_node(callprojs.fallthrough_catchproj, ctl);
462 }
463
464 // The ArrayCopyNode is not disconnected. It still has the
465 // projections for the exception case. Replace current
466 // ArrayCopyNode with a dummy new one with a top() control so
467 // that this part of the graph stays consistent but is
468 // eventually removed.
469
470 set_req(0, phase->C->top());
471 remove_dead_region(phase, can_reshape);
472 }
473 } else {
474 if (in(TypeFunc::Control) != ctl) {
475 // we can't return new memory and control from Ideal at parse time
476 assert(!is_clonebasic(), "added control for clone?");
477 return false;
478 }
479 }
480 return true;
481 }
482
483
484 Node *ArrayCopyNode::Ideal(PhaseGVN *phase, bool can_reshape) {
485 if (remove_dead_region(phase, can_reshape)) return this;
486
487 if (StressArrayCopyMacroNode && !can_reshape) {
488 phase->record_for_igvn(this);
489 return NULL;
490 }
491
492 // See if it's a small array copy and we can inline it as
493 // loads/stores
494 // Here we can only do:
495 // - arraycopy if all arguments were validated before and we don't
496 // need card marking
497 // - clone for which we don't need to do card marking
498
499 if (!is_clonebasic() && !is_arraycopy_validated() &&
500 !is_copyofrange_validated() && !is_copyof_validated()) {
501 return NULL;
502 }
503
504 assert(in(TypeFunc::Control) != NULL &&
505 in(TypeFunc::Memory) != NULL &&
506 in(ArrayCopyNode::Src) != NULL &&
507 in(ArrayCopyNode::Dest) != NULL &&
508 in(ArrayCopyNode::Length) != NULL &&
509 ((in(ArrayCopyNode::SrcPos) != NULL && in(ArrayCopyNode::DestPos) != NULL) ||
510 is_clonebasic()), "broken inputs");
511
512 if (in(TypeFunc::Control)->is_top() ||
513 in(TypeFunc::Memory)->is_top() ||
514 phase->type(in(ArrayCopyNode::Src)) == Type::TOP ||
515 phase->type(in(ArrayCopyNode::Dest)) == Type::TOP ||
516 (in(ArrayCopyNode::SrcPos) != NULL && in(ArrayCopyNode::SrcPos)->is_top()) ||
517 (in(ArrayCopyNode::DestPos) != NULL && in(ArrayCopyNode::DestPos)->is_top())) {
518 return NULL;
519 }
520
521 int count = get_count(phase);
522
523 if (count < 0 || count > ArrayCopyLoadStoreMaxElem) {
524 return NULL;
525 }
526
527 Node* mem = try_clone_instance(phase, can_reshape, count);
528 if (mem != NULL) {
529 return (mem == NodeSentinel) ? NULL : mem;
530 }
531
532 Node* adr_src = NULL;
533 Node* base_src = NULL;
534 Node* adr_dest = NULL;
535 Node* base_dest = NULL;
536 BasicType copy_type = T_ILLEGAL;
537 const Type* value_type = NULL;
538 bool disjoint_bases = false;
539
540 if (!prepare_array_copy(phase, can_reshape,
541 adr_src, base_src, adr_dest, base_dest,
542 copy_type, value_type, disjoint_bases)) {
543 return NULL;
544 }
545
546 Node* src = in(ArrayCopyNode::Src);
547 Node* dest = in(ArrayCopyNode::Dest);
548 const TypePtr* atp_src = get_address_type(phase, src);
549 const TypePtr* atp_dest = get_address_type(phase, dest);
550 uint alias_idx_src = phase->C->get_alias_index(atp_src);
551 uint alias_idx_dest = phase->C->get_alias_index(atp_dest);
552
553 Node *in_mem = in(TypeFunc::Memory);
554 Node *start_mem_src = in_mem;
555 Node *start_mem_dest = in_mem;
556 if (in_mem->is_MergeMem()) {
557 start_mem_src = in_mem->as_MergeMem()->memory_at(alias_idx_src);
558 start_mem_dest = in_mem->as_MergeMem()->memory_at(alias_idx_dest);
559 }
560
561
562 if (can_reshape) {
563 assert(!phase->is_IterGVN()->delay_transform(), "cannot delay transforms");
564 phase->is_IterGVN()->set_delay_transform(true);
565 }
566
567 Node* backward_ctl = phase->C->top();
568 Node* forward_ctl = phase->C->top();
569 array_copy_test_overlap(phase, can_reshape, disjoint_bases, count, forward_ctl, backward_ctl);
570
571 Node* forward_mem = array_copy_forward(phase, can_reshape, forward_ctl,
572 start_mem_src, start_mem_dest,
573 atp_src, atp_dest,
574 adr_src, base_src, adr_dest, base_dest,
575 copy_type, value_type, count);
576
577 Node* backward_mem = array_copy_backward(phase, can_reshape, backward_ctl,
578 start_mem_src, start_mem_dest,
579 atp_src, atp_dest,
580 adr_src, base_src, adr_dest, base_dest,
581 copy_type, value_type, count);
582
583 Node* ctl = NULL;
584 if (!forward_ctl->is_top() && !backward_ctl->is_top()) {
585 ctl = new RegionNode(3);
586 mem = new PhiNode(ctl, Type::MEMORY, atp_dest);
587 ctl->init_req(1, forward_ctl);
588 mem->init_req(1, forward_mem);
589 ctl->init_req(2, backward_ctl);
590 mem->init_req(2, backward_mem);
591 ctl = phase->transform(ctl);
592 mem = phase->transform(mem);
593 } else if (!forward_ctl->is_top()) {
594 ctl = forward_ctl;
595 mem = forward_mem;
596 } else {
597 assert(!backward_ctl->is_top(), "no copy?");
598 ctl = backward_ctl;
599 mem = backward_mem;
600 }
601
602 if (can_reshape) {
603 assert(phase->is_IterGVN()->delay_transform(), "should be delaying transforms");
604 phase->is_IterGVN()->set_delay_transform(false);
605 }
606
607 MergeMemNode* out_mem = MergeMemNode::make(in_mem);
608 out_mem->set_memory_at(alias_idx_dest, mem);
609 mem = out_mem;
610
611 if (!finish_transform(phase, can_reshape, ctl, mem)) {
612 return NULL;
613 }
614
615 return mem;
616 }
617
618 bool ArrayCopyNode::may_modify(const TypeOopPtr *t_oop, PhaseTransform *phase) {
619 Node* dest = in(ArrayCopyNode::Dest);
620 if (dest->is_top()) {
621 return false;
622 }
623 const TypeOopPtr* dest_t = phase->type(dest)->is_oopptr();
624 assert(!dest_t->is_known_instance() || _dest_type->is_known_instance(), "result of EA not recorded");
625 assert(in(ArrayCopyNode::Src)->is_top() || !phase->type(in(ArrayCopyNode::Src))->is_oopptr()->is_known_instance() ||
626 _src_type->is_known_instance(), "result of EA not recorded");
627
628 if (_dest_type != TypeOopPtr::BOTTOM || t_oop->is_known_instance()) {
629 assert(_dest_type == TypeOopPtr::BOTTOM || _dest_type->is_known_instance(), "result of EA is known instance");
630 return t_oop->instance_id() == _dest_type->instance_id();
631 }
632
633 return CallNode::may_modify_arraycopy_helper(dest_t, t_oop, phase);
634 }
635
636 bool ArrayCopyNode::may_modify_helper(const TypeOopPtr *t_oop, Node* n, PhaseTransform *phase, CallNode*& call) {
637 if (n != NULL &&
638 n->is_Call() &&
639 n->as_Call()->may_modify(t_oop, phase) &&
640 (n->as_Call()->is_ArrayCopy() || n->as_Call()->is_call_to_arraycopystub())) {
641 call = n->as_Call();
642 return true;
643 }
644 return false;
645 }
646
647 static Node* step_over_gc_barrier(Node* c) {
648 if (UseG1GC && !GraphKit::use_ReduceInitialCardMarks() &&
649 c != NULL && c->is_Region() && c->req() == 3) {
650 for (uint i = 1; i < c->req(); i++) {
651 if (c->in(i) != NULL && c->in(i)->is_Region() &&
652 c->in(i)->req() == 3) {
653 Node* r = c->in(i);
654 for (uint j = 1; j < r->req(); j++) {
655 if (r->in(j) != NULL && r->in(j)->is_Proj() &&
656 r->in(j)->in(0) != NULL &&
657 r->in(j)->in(0)->Opcode() == Op_CallLeaf &&
658 r->in(j)->in(0)->as_Call()->entry_point() == CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post)) {
659 Node* call = r->in(j)->in(0);
660 c = c->in(i == 1 ? 2 : 1);
661 if (c != NULL) {
662 c = c->in(0);
663 if (c != NULL) {
664 c = c->in(0);
665 assert(call->in(0) == NULL ||
666 call->in(0)->in(0) == NULL ||
667 call->in(0)->in(0)->in(0) == NULL ||
668 call->in(0)->in(0)->in(0)->in(0) == NULL ||
669 call->in(0)->in(0)->in(0)->in(0)->in(0) == NULL ||
670 c == call->in(0)->in(0)->in(0)->in(0)->in(0), "bad barrier shape");
671 return c;
672 }
673 }
674 }
675 }
676 }
677 }
678 }
679 return c;
680 }
681
682 bool ArrayCopyNode::may_modify(const TypeOopPtr *t_oop, MemBarNode* mb, PhaseTransform *phase, ArrayCopyNode*& ac) {
683
684 Node* c = mb->in(0);
685
686 // step over g1 gc barrier if we're at a clone with ReduceInitialCardMarks off
687 c = step_over_gc_barrier(c);
688
689 CallNode* call = NULL;
690 if (c != NULL && c->is_Region()) {
691 for (uint i = 1; i < c->req(); i++) {
692 if (c->in(i) != NULL) {
693 Node* n = c->in(i)->in(0);
694 if (may_modify_helper(t_oop, n, phase, call)) {
695 ac = call->isa_ArrayCopy();
696 assert(c == mb->in(0), "only for clone");
697 return true;
698 }
699 }
700 }
701 } else if (may_modify_helper(t_oop, c->in(0), phase, call)) {
702 ac = call->isa_ArrayCopy();
703 assert(c == mb->in(0) || (ac != NULL && ac->is_clonebasic() && !GraphKit::use_ReduceInitialCardMarks()), "only for clone");
704 return true;
705 }
706
707 return false;
708 }
709
710 // Does this array copy modify offsets between offset_lo and offset_hi
711 // in the destination array
712 // if must_modify is false, return true if the copy could write
713 // between offset_lo and offset_hi
714 // if must_modify is true, return true if the copy is guaranteed to
715 // write between offset_lo and offset_hi
716 bool ArrayCopyNode::modifies(intptr_t offset_lo, intptr_t offset_hi, PhaseTransform* phase, bool must_modify) const {
717 assert(_kind == ArrayCopy || _kind == CopyOf || _kind == CopyOfRange, "only for real array copies");
718
719 Node* dest = in(Dest);
720 Node* dest_pos = in(DestPos);
721 Node* len = in(Length);
722
723 const TypeInt *dest_pos_t = phase->type(dest_pos)->isa_int();
724 const TypeInt *len_t = phase->type(len)->isa_int();
725 const TypeAryPtr* ary_t = phase->type(dest)->isa_aryptr();
726
727 if (dest_pos_t == NULL || len_t == NULL || ary_t == NULL) {
728 return !must_modify;
729 }
730
731 BasicType ary_elem = ary_t->klass()->as_array_klass()->element_type()->basic_type();
732 uint header = arrayOopDesc::base_offset_in_bytes(ary_elem);
733 uint elemsize = type2aelembytes(ary_elem);
734
735 jlong dest_pos_plus_len_lo = (((jlong)dest_pos_t->_lo) + len_t->_lo) * elemsize + header;
736 jlong dest_pos_plus_len_hi = (((jlong)dest_pos_t->_hi) + len_t->_hi) * elemsize + header;
737 jlong dest_pos_lo = ((jlong)dest_pos_t->_lo) * elemsize + header;
738 jlong dest_pos_hi = ((jlong)dest_pos_t->_hi) * elemsize + header;
739
740 if (must_modify) {
741 if (offset_lo >= dest_pos_hi && offset_hi < dest_pos_plus_len_lo) {
742 return true;
743 }
744 } else {
745 if (offset_hi >= dest_pos_lo && offset_lo < dest_pos_plus_len_hi) {
746 return true;
747 }
748 }
749 return false;
750 }
751