Mercurial > hg > graal-compiler
annotate src/share/vm/opto/memnode.cpp @ 33:3288958bf319
6667580: Optimize CmpP for allocations
Summary: CmpP could be optimized out if it compares new allocated objects.
Reviewed-by: jrose, never, rasbold
author | kvn |
---|---|
date | Fri, 29 Feb 2008 09:57:18 -0800 |
parents | d5fc211aea19 |
children | f34d9da7acb2 |
rev | line source |
---|---|
0 | 1 /* |
2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // Portions of code courtesy of Clifford Click | |
26 | |
27 // Optimization - Graph Style | |
28 | |
29 #include "incls/_precompiled.incl" | |
30 #include "incls/_memnode.cpp.incl" | |
31 | |
32 //============================================================================= | |
33 uint MemNode::size_of() const { return sizeof(*this); } | |
34 | |
35 const TypePtr *MemNode::adr_type() const { | |
36 Node* adr = in(Address); | |
37 const TypePtr* cross_check = NULL; | |
38 DEBUG_ONLY(cross_check = _adr_type); | |
39 return calculate_adr_type(adr->bottom_type(), cross_check); | |
40 } | |
41 | |
42 #ifndef PRODUCT | |
43 void MemNode::dump_spec(outputStream *st) const { | |
44 if (in(Address) == NULL) return; // node is dead | |
45 #ifndef ASSERT | |
46 // fake the missing field | |
47 const TypePtr* _adr_type = NULL; | |
48 if (in(Address) != NULL) | |
49 _adr_type = in(Address)->bottom_type()->isa_ptr(); | |
50 #endif | |
51 dump_adr_type(this, _adr_type, st); | |
52 | |
53 Compile* C = Compile::current(); | |
54 if( C->alias_type(_adr_type)->is_volatile() ) | |
55 st->print(" Volatile!"); | |
56 } | |
57 | |
58 void MemNode::dump_adr_type(const Node* mem, const TypePtr* adr_type, outputStream *st) { | |
59 st->print(" @"); | |
60 if (adr_type == NULL) { | |
61 st->print("NULL"); | |
62 } else { | |
63 adr_type->dump_on(st); | |
64 Compile* C = Compile::current(); | |
65 Compile::AliasType* atp = NULL; | |
66 if (C->have_alias_type(adr_type)) atp = C->alias_type(adr_type); | |
67 if (atp == NULL) | |
68 st->print(", idx=?\?;"); | |
69 else if (atp->index() == Compile::AliasIdxBot) | |
70 st->print(", idx=Bot;"); | |
71 else if (atp->index() == Compile::AliasIdxTop) | |
72 st->print(", idx=Top;"); | |
73 else if (atp->index() == Compile::AliasIdxRaw) | |
74 st->print(", idx=Raw;"); | |
75 else { | |
76 ciField* field = atp->field(); | |
77 if (field) { | |
78 st->print(", name="); | |
79 field->print_name_on(st); | |
80 } | |
81 st->print(", idx=%d;", atp->index()); | |
82 } | |
83 } | |
84 } | |
85 | |
86 extern void print_alias_types(); | |
87 | |
88 #endif | |
89 | |
90 //--------------------------Ideal_common--------------------------------------- | |
91 // Look for degenerate control and memory inputs. Bypass MergeMem inputs. | |
92 // Unhook non-raw memories from complete (macro-expanded) initializations. | |
93 Node *MemNode::Ideal_common(PhaseGVN *phase, bool can_reshape) { | |
94 // If our control input is a dead region, kill all below the region | |
95 Node *ctl = in(MemNode::Control); | |
96 if (ctl && remove_dead_region(phase, can_reshape)) | |
97 return this; | |
98 | |
99 // Ignore if memory is dead, or self-loop | |
100 Node *mem = in(MemNode::Memory); | |
101 if( phase->type( mem ) == Type::TOP ) return NodeSentinel; // caller will return NULL | |
102 assert( mem != this, "dead loop in MemNode::Ideal" ); | |
103 | |
104 Node *address = in(MemNode::Address); | |
105 const Type *t_adr = phase->type( address ); | |
106 if( t_adr == Type::TOP ) return NodeSentinel; // caller will return NULL | |
107 | |
108 // Avoid independent memory operations | |
109 Node* old_mem = mem; | |
110 | |
111 if (mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
112 InitializeNode* init = mem->in(0)->as_Initialize(); | |
113 if (init->is_complete()) { // i.e., after macro expansion | |
114 const TypePtr* tp = t_adr->is_ptr(); | |
115 uint alias_idx = phase->C->get_alias_index(tp); | |
116 // Free this slice from the init. It was hooked, temporarily, | |
117 // by GraphKit::set_output_for_allocation. | |
118 if (alias_idx > Compile::AliasIdxRaw) { | |
119 mem = init->memory(alias_idx); | |
120 // ...but not with the raw-pointer slice. | |
121 } | |
122 } | |
123 } | |
124 | |
125 if (mem->is_MergeMem()) { | |
126 MergeMemNode* mmem = mem->as_MergeMem(); | |
127 const TypePtr *tp = t_adr->is_ptr(); | |
128 uint alias_idx = phase->C->get_alias_index(tp); | |
129 #ifdef ASSERT | |
130 { | |
131 // Check that current type is consistent with the alias index used during graph construction | |
132 assert(alias_idx >= Compile::AliasIdxRaw, "must not be a bad alias_idx"); | |
133 const TypePtr *adr_t = adr_type(); | |
134 bool consistent = adr_t == NULL || adr_t->empty() || phase->C->must_alias(adr_t, alias_idx ); | |
135 // Sometimes dead array references collapse to a[-1], a[-2], or a[-3] | |
136 if( !consistent && adr_t != NULL && !adr_t->empty() && | |
137 tp->isa_aryptr() && tp->offset() == Type::OffsetBot && | |
138 adr_t->isa_aryptr() && adr_t->offset() != Type::OffsetBot && | |
139 ( adr_t->offset() == arrayOopDesc::length_offset_in_bytes() || | |
140 adr_t->offset() == oopDesc::klass_offset_in_bytes() || | |
141 adr_t->offset() == oopDesc::mark_offset_in_bytes() ) ) { | |
142 // don't assert if it is dead code. | |
143 consistent = true; | |
144 } | |
145 if( !consistent ) { | |
146 tty->print("alias_idx==%d, adr_type()==", alias_idx); if( adr_t == NULL ) { tty->print("NULL"); } else { adr_t->dump(); } | |
147 tty->cr(); | |
148 print_alias_types(); | |
149 assert(consistent, "adr_type must match alias idx"); | |
150 } | |
151 } | |
152 #endif | |
153 // TypeInstPtr::NOTNULL+any is an OOP with unknown offset - generally | |
154 // means an array I have not precisely typed yet. Do not do any | |
155 // alias stuff with it any time soon. | |
156 const TypeInstPtr *tinst = tp->isa_instptr(); | |
157 if( tp->base() != Type::AnyPtr && | |
158 !(tinst && | |
159 tinst->klass()->is_java_lang_Object() && | |
160 tinst->offset() == Type::OffsetBot) ) { | |
161 // compress paths and change unreachable cycles to TOP | |
162 // If not, we can update the input infinitely along a MergeMem cycle | |
163 // Equivalent code in PhiNode::Ideal | |
164 Node* m = phase->transform(mmem); | |
165 // If tranformed to a MergeMem, get the desired slice | |
166 // Otherwise the returned node represents memory for every slice | |
167 mem = (m->is_MergeMem())? m->as_MergeMem()->memory_at(alias_idx) : m; | |
168 // Update input if it is progress over what we have now | |
169 } | |
170 } | |
171 | |
172 if (mem != old_mem) { | |
173 set_req(MemNode::Memory, mem); | |
174 return this; | |
175 } | |
176 | |
177 // let the subclass continue analyzing... | |
178 return NULL; | |
179 } | |
180 | |
181 // Helper function for proving some simple control dominations. | |
182 // Attempt to prove that control input 'dom' dominates (or equals) 'sub'. | |
183 // Already assumes that 'dom' is available at 'sub', and that 'sub' | |
184 // is not a constant (dominated by the method's StartNode). | |
185 // Used by MemNode::find_previous_store to prove that the | |
186 // control input of a memory operation predates (dominates) | |
187 // an allocation it wants to look past. | |
188 bool MemNode::detect_dominating_control(Node* dom, Node* sub) { | |
189 if (dom == NULL) return false; | |
190 if (dom->is_Proj()) dom = dom->in(0); | |
191 if (dom->is_Start()) return true; // anything inside the method | |
192 if (dom->is_Root()) return true; // dom 'controls' a constant | |
193 int cnt = 20; // detect cycle or too much effort | |
194 while (sub != NULL) { // walk 'sub' up the chain to 'dom' | |
195 if (--cnt < 0) return false; // in a cycle or too complex | |
196 if (sub == dom) return true; | |
197 if (sub->is_Start()) return false; | |
198 if (sub->is_Root()) return false; | |
199 Node* up = sub->in(0); | |
200 if (sub == up && sub->is_Region()) { | |
201 for (uint i = 1; i < sub->req(); i++) { | |
202 Node* in = sub->in(i); | |
203 if (in != NULL && !in->is_top() && in != sub) { | |
204 up = in; break; // take any path on the way up to 'dom' | |
205 } | |
206 } | |
207 } | |
208 if (sub == up) return false; // some kind of tight cycle | |
209 sub = up; | |
210 } | |
211 return false; | |
212 } | |
213 | |
214 //---------------------detect_ptr_independence--------------------------------- | |
215 // Used by MemNode::find_previous_store to prove that two base | |
216 // pointers are never equal. | |
217 // The pointers are accompanied by their associated allocations, | |
218 // if any, which have been previously discovered by the caller. | |
219 bool MemNode::detect_ptr_independence(Node* p1, AllocateNode* a1, | |
220 Node* p2, AllocateNode* a2, | |
221 PhaseTransform* phase) { | |
222 // Attempt to prove that these two pointers cannot be aliased. | |
223 // They may both manifestly be allocations, and they should differ. | |
224 // Or, if they are not both allocations, they can be distinct constants. | |
225 // Otherwise, one is an allocation and the other a pre-existing value. | |
226 if (a1 == NULL && a2 == NULL) { // neither an allocation | |
227 return (p1 != p2) && p1->is_Con() && p2->is_Con(); | |
228 } else if (a1 != NULL && a2 != NULL) { // both allocations | |
229 return (a1 != a2); | |
230 } else if (a1 != NULL) { // one allocation a1 | |
231 // (Note: p2->is_Con implies p2->in(0)->is_Root, which dominates.) | |
232 return detect_dominating_control(p2->in(0), a1->in(0)); | |
233 } else { //(a2 != NULL) // one allocation a2 | |
234 return detect_dominating_control(p1->in(0), a2->in(0)); | |
235 } | |
236 return false; | |
237 } | |
238 | |
239 | |
240 // The logic for reordering loads and stores uses four steps: | |
241 // (a) Walk carefully past stores and initializations which we | |
242 // can prove are independent of this load. | |
243 // (b) Observe that the next memory state makes an exact match | |
244 // with self (load or store), and locate the relevant store. | |
245 // (c) Ensure that, if we were to wire self directly to the store, | |
246 // the optimizer would fold it up somehow. | |
247 // (d) Do the rewiring, and return, depending on some other part of | |
248 // the optimizer to fold up the load. | |
249 // This routine handles steps (a) and (b). Steps (c) and (d) are | |
250 // specific to loads and stores, so they are handled by the callers. | |
251 // (Currently, only LoadNode::Ideal has steps (c), (d). More later.) | |
252 // | |
253 Node* MemNode::find_previous_store(PhaseTransform* phase) { | |
254 Node* ctrl = in(MemNode::Control); | |
255 Node* adr = in(MemNode::Address); | |
256 intptr_t offset = 0; | |
257 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
258 AllocateNode* alloc = AllocateNode::Ideal_allocation(base, phase); | |
259 | |
260 if (offset == Type::OffsetBot) | |
261 return NULL; // cannot unalias unless there are precise offsets | |
262 | |
263 intptr_t size_in_bytes = memory_size(); | |
264 | |
265 Node* mem = in(MemNode::Memory); // start searching here... | |
266 | |
267 int cnt = 50; // Cycle limiter | |
268 for (;;) { // While we can dance past unrelated stores... | |
269 if (--cnt < 0) break; // Caught in cycle or a complicated dance? | |
270 | |
271 if (mem->is_Store()) { | |
272 Node* st_adr = mem->in(MemNode::Address); | |
273 intptr_t st_offset = 0; | |
274 Node* st_base = AddPNode::Ideal_base_and_offset(st_adr, phase, st_offset); | |
275 if (st_base == NULL) | |
276 break; // inscrutable pointer | |
277 if (st_offset != offset && st_offset != Type::OffsetBot) { | |
278 const int MAX_STORE = BytesPerLong; | |
279 if (st_offset >= offset + size_in_bytes || | |
280 st_offset <= offset - MAX_STORE || | |
281 st_offset <= offset - mem->as_Store()->memory_size()) { | |
282 // Success: The offsets are provably independent. | |
283 // (You may ask, why not just test st_offset != offset and be done? | |
284 // The answer is that stores of different sizes can co-exist | |
285 // in the same sequence of RawMem effects. We sometimes initialize | |
286 // a whole 'tile' of array elements with a single jint or jlong.) | |
287 mem = mem->in(MemNode::Memory); | |
288 continue; // (a) advance through independent store memory | |
289 } | |
290 } | |
291 if (st_base != base && | |
292 detect_ptr_independence(base, alloc, | |
293 st_base, | |
294 AllocateNode::Ideal_allocation(st_base, phase), | |
295 phase)) { | |
296 // Success: The bases are provably independent. | |
297 mem = mem->in(MemNode::Memory); | |
298 continue; // (a) advance through independent store memory | |
299 } | |
300 | |
301 // (b) At this point, if the bases or offsets do not agree, we lose, | |
302 // since we have not managed to prove 'this' and 'mem' independent. | |
303 if (st_base == base && st_offset == offset) { | |
304 return mem; // let caller handle steps (c), (d) | |
305 } | |
306 | |
307 } else if (mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
308 InitializeNode* st_init = mem->in(0)->as_Initialize(); | |
309 AllocateNode* st_alloc = st_init->allocation(); | |
310 if (st_alloc == NULL) | |
311 break; // something degenerated | |
312 bool known_identical = false; | |
313 bool known_independent = false; | |
314 if (alloc == st_alloc) | |
315 known_identical = true; | |
316 else if (alloc != NULL) | |
317 known_independent = true; | |
318 else if (ctrl != NULL && | |
319 detect_dominating_control(ctrl, st_alloc->in(0))) | |
320 known_independent = true; | |
321 | |
322 if (known_independent) { | |
323 // The bases are provably independent: Either they are | |
324 // manifestly distinct allocations, or else the control | |
325 // of this load dominates the store's allocation. | |
326 int alias_idx = phase->C->get_alias_index(adr_type()); | |
327 if (alias_idx == Compile::AliasIdxRaw) { | |
328 mem = st_alloc->in(TypeFunc::Memory); | |
329 } else { | |
330 mem = st_init->memory(alias_idx); | |
331 } | |
332 continue; // (a) advance through independent store memory | |
333 } | |
334 | |
335 // (b) at this point, if we are not looking at a store initializing | |
336 // the same allocation we are loading from, we lose. | |
337 if (known_identical) { | |
338 // From caller, can_see_stored_value will consult find_captured_store. | |
339 return mem; // let caller handle steps (c), (d) | |
340 } | |
341 | |
342 } | |
343 | |
344 // Unless there is an explicit 'continue', we must bail out here, | |
345 // because 'mem' is an inscrutable memory state (e.g., a call). | |
346 break; | |
347 } | |
348 | |
349 return NULL; // bail out | |
350 } | |
351 | |
352 //----------------------calculate_adr_type------------------------------------- | |
353 // Helper function. Notices when the given type of address hits top or bottom. | |
354 // Also, asserts a cross-check of the type against the expected address type. | |
355 const TypePtr* MemNode::calculate_adr_type(const Type* t, const TypePtr* cross_check) { | |
356 if (t == Type::TOP) return NULL; // does not touch memory any more? | |
357 #ifdef PRODUCT | |
358 cross_check = NULL; | |
359 #else | |
360 if (!VerifyAliases || is_error_reported() || Node::in_dump()) cross_check = NULL; | |
361 #endif | |
362 const TypePtr* tp = t->isa_ptr(); | |
363 if (tp == NULL) { | |
364 assert(cross_check == NULL || cross_check == TypePtr::BOTTOM, "expected memory type must be wide"); | |
365 return TypePtr::BOTTOM; // touches lots of memory | |
366 } else { | |
367 #ifdef ASSERT | |
368 // %%%% [phh] We don't check the alias index if cross_check is | |
369 // TypeRawPtr::BOTTOM. Needs to be investigated. | |
370 if (cross_check != NULL && | |
371 cross_check != TypePtr::BOTTOM && | |
372 cross_check != TypeRawPtr::BOTTOM) { | |
373 // Recheck the alias index, to see if it has changed (due to a bug). | |
374 Compile* C = Compile::current(); | |
375 assert(C->get_alias_index(cross_check) == C->get_alias_index(tp), | |
376 "must stay in the original alias category"); | |
377 // The type of the address must be contained in the adr_type, | |
378 // disregarding "null"-ness. | |
379 // (We make an exception for TypeRawPtr::BOTTOM, which is a bit bucket.) | |
380 const TypePtr* tp_notnull = tp->join(TypePtr::NOTNULL)->is_ptr(); | |
381 assert(cross_check->meet(tp_notnull) == cross_check, | |
382 "real address must not escape from expected memory type"); | |
383 } | |
384 #endif | |
385 return tp; | |
386 } | |
387 } | |
388 | |
389 //------------------------adr_phi_is_loop_invariant---------------------------- | |
390 // A helper function for Ideal_DU_postCCP to check if a Phi in a counted | |
391 // loop is loop invariant. Make a quick traversal of Phi and associated | |
392 // CastPP nodes, looking to see if they are a closed group within the loop. | |
393 bool MemNode::adr_phi_is_loop_invariant(Node* adr_phi, Node* cast) { | |
394 // The idea is that the phi-nest must boil down to only CastPP nodes | |
395 // with the same data. This implies that any path into the loop already | |
396 // includes such a CastPP, and so the original cast, whatever its input, | |
397 // must be covered by an equivalent cast, with an earlier control input. | |
398 ResourceMark rm; | |
399 | |
400 // The loop entry input of the phi should be the unique dominating | |
401 // node for every Phi/CastPP in the loop. | |
402 Unique_Node_List closure; | |
403 closure.push(adr_phi->in(LoopNode::EntryControl)); | |
404 | |
405 // Add the phi node and the cast to the worklist. | |
406 Unique_Node_List worklist; | |
407 worklist.push(adr_phi); | |
408 if( cast != NULL ){ | |
409 if( !cast->is_ConstraintCast() ) return false; | |
410 worklist.push(cast); | |
411 } | |
412 | |
413 // Begin recursive walk of phi nodes. | |
414 while( worklist.size() ){ | |
415 // Take a node off the worklist | |
416 Node *n = worklist.pop(); | |
417 if( !closure.member(n) ){ | |
418 // Add it to the closure. | |
419 closure.push(n); | |
420 // Make a sanity check to ensure we don't waste too much time here. | |
421 if( closure.size() > 20) return false; | |
422 // This node is OK if: | |
423 // - it is a cast of an identical value | |
424 // - or it is a phi node (then we add its inputs to the worklist) | |
425 // Otherwise, the node is not OK, and we presume the cast is not invariant | |
426 if( n->is_ConstraintCast() ){ | |
427 worklist.push(n->in(1)); | |
428 } else if( n->is_Phi() ) { | |
429 for( uint i = 1; i < n->req(); i++ ) { | |
430 worklist.push(n->in(i)); | |
431 } | |
432 } else { | |
433 return false; | |
434 } | |
435 } | |
436 } | |
437 | |
438 // Quit when the worklist is empty, and we've found no offending nodes. | |
439 return true; | |
440 } | |
441 | |
442 //------------------------------Ideal_DU_postCCP------------------------------- | |
443 // Find any cast-away of null-ness and keep its control. Null cast-aways are | |
444 // going away in this pass and we need to make this memory op depend on the | |
445 // gating null check. | |
446 | |
447 // I tried to leave the CastPP's in. This makes the graph more accurate in | |
448 // some sense; we get to keep around the knowledge that an oop is not-null | |
449 // after some test. Alas, the CastPP's interfere with GVN (some values are | |
450 // the regular oop, some are the CastPP of the oop, all merge at Phi's which | |
451 // cannot collapse, etc). This cost us 10% on SpecJVM, even when I removed | |
452 // some of the more trivial cases in the optimizer. Removing more useless | |
453 // Phi's started allowing Loads to illegally float above null checks. I gave | |
454 // up on this approach. CNC 10/20/2000 | |
455 Node *MemNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { | |
456 Node *ctr = in(MemNode::Control); | |
457 Node *mem = in(MemNode::Memory); | |
458 Node *adr = in(MemNode::Address); | |
459 Node *skipped_cast = NULL; | |
460 // Need a null check? Regular static accesses do not because they are | |
461 // from constant addresses. Array ops are gated by the range check (which | |
462 // always includes a NULL check). Just check field ops. | |
463 if( !ctr ) { | |
464 // Scan upwards for the highest location we can place this memory op. | |
465 while( true ) { | |
466 switch( adr->Opcode() ) { | |
467 | |
468 case Op_AddP: // No change to NULL-ness, so peek thru AddP's | |
469 adr = adr->in(AddPNode::Base); | |
470 continue; | |
471 | |
472 case Op_CastPP: | |
473 // If the CastPP is useless, just peek on through it. | |
474 if( ccp->type(adr) == ccp->type(adr->in(1)) ) { | |
475 // Remember the cast that we've peeked though. If we peek | |
476 // through more than one, then we end up remembering the highest | |
477 // one, that is, if in a loop, the one closest to the top. | |
478 skipped_cast = adr; | |
479 adr = adr->in(1); | |
480 continue; | |
481 } | |
482 // CastPP is going away in this pass! We need this memory op to be | |
483 // control-dependent on the test that is guarding the CastPP. | |
484 ccp->hash_delete(this); | |
485 set_req(MemNode::Control, adr->in(0)); | |
486 ccp->hash_insert(this); | |
487 return this; | |
488 | |
489 case Op_Phi: | |
490 // Attempt to float above a Phi to some dominating point. | |
491 if (adr->in(0) != NULL && adr->in(0)->is_CountedLoop()) { | |
492 // If we've already peeked through a Cast (which could have set the | |
493 // control), we can't float above a Phi, because the skipped Cast | |
494 // may not be loop invariant. | |
495 if (adr_phi_is_loop_invariant(adr, skipped_cast)) { | |
496 adr = adr->in(1); | |
497 continue; | |
498 } | |
499 } | |
500 | |
501 // Intentional fallthrough! | |
502 | |
503 // No obvious dominating point. The mem op is pinned below the Phi | |
504 // by the Phi itself. If the Phi goes away (no true value is merged) | |
505 // then the mem op can float, but not indefinitely. It must be pinned | |
506 // behind the controls leading to the Phi. | |
507 case Op_CheckCastPP: | |
508 // These usually stick around to change address type, however a | |
509 // useless one can be elided and we still need to pick up a control edge | |
510 if (adr->in(0) == NULL) { | |
511 // This CheckCastPP node has NO control and is likely useless. But we | |
512 // need check further up the ancestor chain for a control input to keep | |
513 // the node in place. 4959717. | |
514 skipped_cast = adr; | |
515 adr = adr->in(1); | |
516 continue; | |
517 } | |
518 ccp->hash_delete(this); | |
519 set_req(MemNode::Control, adr->in(0)); | |
520 ccp->hash_insert(this); | |
521 return this; | |
522 | |
523 // List of "safe" opcodes; those that implicitly block the memory | |
524 // op below any null check. | |
525 case Op_CastX2P: // no null checks on native pointers | |
526 case Op_Parm: // 'this' pointer is not null | |
527 case Op_LoadP: // Loading from within a klass | |
528 case Op_LoadKlass: // Loading from within a klass | |
529 case Op_ConP: // Loading from a klass | |
530 case Op_CreateEx: // Sucking up the guts of an exception oop | |
531 case Op_Con: // Reading from TLS | |
532 case Op_CMoveP: // CMoveP is pinned | |
533 break; // No progress | |
534 | |
535 case Op_Proj: // Direct call to an allocation routine | |
536 case Op_SCMemProj: // Memory state from store conditional ops | |
537 #ifdef ASSERT | |
538 { | |
539 assert(adr->as_Proj()->_con == TypeFunc::Parms, "must be return value"); | |
540 const Node* call = adr->in(0); | |
541 if (call->is_CallStaticJava()) { | |
542 const CallStaticJavaNode* call_java = call->as_CallStaticJava(); | |
543 assert(call_java && call_java->method() == NULL, "must be runtime call"); | |
544 // We further presume that this is one of | |
545 // new_instance_Java, new_array_Java, or | |
546 // the like, but do not assert for this. | |
547 } else if (call->is_Allocate()) { | |
548 // similar case to new_instance_Java, etc. | |
549 } else if (!call->is_CallLeaf()) { | |
550 // Projections from fetch_oop (OSR) are allowed as well. | |
551 ShouldNotReachHere(); | |
552 } | |
553 } | |
554 #endif | |
555 break; | |
556 default: | |
557 ShouldNotReachHere(); | |
558 } | |
559 break; | |
560 } | |
561 } | |
562 | |
563 return NULL; // No progress | |
564 } | |
565 | |
566 | |
567 //============================================================================= | |
568 uint LoadNode::size_of() const { return sizeof(*this); } | |
569 uint LoadNode::cmp( const Node &n ) const | |
570 { return !Type::cmp( _type, ((LoadNode&)n)._type ); } | |
571 const Type *LoadNode::bottom_type() const { return _type; } | |
572 uint LoadNode::ideal_reg() const { | |
573 return Matcher::base2reg[_type->base()]; | |
574 } | |
575 | |
576 #ifndef PRODUCT | |
577 void LoadNode::dump_spec(outputStream *st) const { | |
578 MemNode::dump_spec(st); | |
579 if( !Verbose && !WizardMode ) { | |
580 // standard dump does this in Verbose and WizardMode | |
581 st->print(" #"); _type->dump_on(st); | |
582 } | |
583 } | |
584 #endif | |
585 | |
586 | |
587 //----------------------------LoadNode::make----------------------------------- | |
588 // Polymorphic factory method: | |
589 LoadNode *LoadNode::make( Compile *C, Node *ctl, Node *mem, Node *adr, const TypePtr* adr_type, const Type *rt, BasicType bt ) { | |
590 // sanity check the alias category against the created node type | |
591 assert(!(adr_type->isa_oopptr() && | |
592 adr_type->offset() == oopDesc::klass_offset_in_bytes()), | |
593 "use LoadKlassNode instead"); | |
594 assert(!(adr_type->isa_aryptr() && | |
595 adr_type->offset() == arrayOopDesc::length_offset_in_bytes()), | |
596 "use LoadRangeNode instead"); | |
597 switch (bt) { | |
598 case T_BOOLEAN: | |
599 case T_BYTE: return new (C, 3) LoadBNode(ctl, mem, adr, adr_type, rt->is_int() ); | |
600 case T_INT: return new (C, 3) LoadINode(ctl, mem, adr, adr_type, rt->is_int() ); | |
601 case T_CHAR: return new (C, 3) LoadCNode(ctl, mem, adr, adr_type, rt->is_int() ); | |
602 case T_SHORT: return new (C, 3) LoadSNode(ctl, mem, adr, adr_type, rt->is_int() ); | |
603 case T_LONG: return new (C, 3) LoadLNode(ctl, mem, adr, adr_type, rt->is_long() ); | |
604 case T_FLOAT: return new (C, 3) LoadFNode(ctl, mem, adr, adr_type, rt ); | |
605 case T_DOUBLE: return new (C, 3) LoadDNode(ctl, mem, adr, adr_type, rt ); | |
606 case T_ADDRESS: return new (C, 3) LoadPNode(ctl, mem, adr, adr_type, rt->is_ptr() ); | |
607 case T_OBJECT: return new (C, 3) LoadPNode(ctl, mem, adr, adr_type, rt->is_oopptr()); | |
608 } | |
609 ShouldNotReachHere(); | |
610 return (LoadNode*)NULL; | |
611 } | |
612 | |
613 LoadLNode* LoadLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt) { | |
614 bool require_atomic = true; | |
615 return new (C, 3) LoadLNode(ctl, mem, adr, adr_type, rt->is_long(), require_atomic); | |
616 } | |
617 | |
618 | |
619 | |
620 | |
621 //------------------------------hash------------------------------------------- | |
622 uint LoadNode::hash() const { | |
623 // unroll addition of interesting fields | |
624 return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address); | |
625 } | |
626 | |
627 //---------------------------can_see_stored_value------------------------------ | |
628 // This routine exists to make sure this set of tests is done the same | |
629 // everywhere. We need to make a coordinated change: first LoadNode::Ideal | |
630 // will change the graph shape in a way which makes memory alive twice at the | |
631 // same time (uses the Oracle model of aliasing), then some | |
632 // LoadXNode::Identity will fold things back to the equivalence-class model | |
633 // of aliasing. | |
634 Node* MemNode::can_see_stored_value(Node* st, PhaseTransform* phase) const { | |
635 Node* ld_adr = in(MemNode::Address); | |
636 | |
17
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
637 const TypeInstPtr* tp = phase->type(ld_adr)->isa_instptr(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
638 Compile::AliasType* atp = tp != NULL ? phase->C->alias_type(tp) : NULL; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
639 if (EliminateAutoBox && atp != NULL && atp->index() >= Compile::AliasIdxRaw && |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
640 atp->field() != NULL && !atp->field()->is_volatile()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
641 uint alias_idx = atp->index(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
642 bool final = atp->field()->is_final(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
643 Node* result = NULL; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
644 Node* current = st; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
645 // Skip through chains of MemBarNodes checking the MergeMems for |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
646 // new states for the slice of this load. Stop once any other |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
647 // kind of node is encountered. Loads from final memory can skip |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
648 // through any kind of MemBar but normal loads shouldn't skip |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
649 // through MemBarAcquire since the could allow them to move out of |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
650 // a synchronized region. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
651 while (current->is_Proj()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
652 int opc = current->in(0)->Opcode(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
653 if ((final && opc == Op_MemBarAcquire) || |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
654 opc == Op_MemBarRelease || opc == Op_MemBarCPUOrder) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
655 Node* mem = current->in(0)->in(TypeFunc::Memory); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
656 if (mem->is_MergeMem()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
657 MergeMemNode* merge = mem->as_MergeMem(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
658 Node* new_st = merge->memory_at(alias_idx); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
659 if (new_st == merge->base_memory()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
660 // Keep searching |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
661 current = merge->base_memory(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
662 continue; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
663 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
664 // Save the new memory state for the slice and fall through |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
665 // to exit. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
666 result = new_st; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
667 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
668 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
669 break; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
670 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
671 if (result != NULL) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
672 st = result; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
673 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
674 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
675 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
676 |
0 | 677 // Loop around twice in the case Load -> Initialize -> Store. |
678 // (See PhaseIterGVN::add_users_to_worklist, which knows about this case.) | |
679 for (int trip = 0; trip <= 1; trip++) { | |
680 | |
681 if (st->is_Store()) { | |
682 Node* st_adr = st->in(MemNode::Address); | |
683 if (!phase->eqv(st_adr, ld_adr)) { | |
684 // Try harder before giving up... Match raw and non-raw pointers. | |
685 intptr_t st_off = 0; | |
686 AllocateNode* alloc = AllocateNode::Ideal_allocation(st_adr, phase, st_off); | |
687 if (alloc == NULL) return NULL; | |
688 intptr_t ld_off = 0; | |
689 AllocateNode* allo2 = AllocateNode::Ideal_allocation(ld_adr, phase, ld_off); | |
690 if (alloc != allo2) return NULL; | |
691 if (ld_off != st_off) return NULL; | |
692 // At this point we have proven something like this setup: | |
693 // A = Allocate(...) | |
694 // L = LoadQ(, AddP(CastPP(, A.Parm),, #Off)) | |
695 // S = StoreQ(, AddP(, A.Parm , #Off), V) | |
696 // (Actually, we haven't yet proven the Q's are the same.) | |
697 // In other words, we are loading from a casted version of | |
698 // the same pointer-and-offset that we stored to. | |
699 // Thus, we are able to replace L by V. | |
700 } | |
701 // Now prove that we have a LoadQ matched to a StoreQ, for some Q. | |
702 if (store_Opcode() != st->Opcode()) | |
703 return NULL; | |
704 return st->in(MemNode::ValueIn); | |
705 } | |
706 | |
707 intptr_t offset = 0; // scratch | |
708 | |
709 // A load from a freshly-created object always returns zero. | |
710 // (This can happen after LoadNode::Ideal resets the load's memory input | |
711 // to find_captured_store, which returned InitializeNode::zero_memory.) | |
712 if (st->is_Proj() && st->in(0)->is_Allocate() && | |
713 st->in(0) == AllocateNode::Ideal_allocation(ld_adr, phase, offset) && | |
714 offset >= st->in(0)->as_Allocate()->minimum_header_size()) { | |
715 // return a zero value for the load's basic type | |
716 // (This is one of the few places where a generic PhaseTransform | |
717 // can create new nodes. Think of it as lazily manifesting | |
718 // virtually pre-existing constants.) | |
719 return phase->zerocon(memory_type()); | |
720 } | |
721 | |
722 // A load from an initialization barrier can match a captured store. | |
723 if (st->is_Proj() && st->in(0)->is_Initialize()) { | |
724 InitializeNode* init = st->in(0)->as_Initialize(); | |
725 AllocateNode* alloc = init->allocation(); | |
726 if (alloc != NULL && | |
727 alloc == AllocateNode::Ideal_allocation(ld_adr, phase, offset)) { | |
728 // examine a captured store value | |
729 st = init->find_captured_store(offset, memory_size(), phase); | |
730 if (st != NULL) | |
731 continue; // take one more trip around | |
732 } | |
733 } | |
734 | |
735 break; | |
736 } | |
737 | |
738 return NULL; | |
739 } | |
740 | |
741 //------------------------------Identity--------------------------------------- | |
742 // Loads are identity if previous store is to same address | |
743 Node *LoadNode::Identity( PhaseTransform *phase ) { | |
744 // If the previous store-maker is the right kind of Store, and the store is | |
745 // to the same address, then we are equal to the value stored. | |
746 Node* mem = in(MemNode::Memory); | |
747 Node* value = can_see_stored_value(mem, phase); | |
748 if( value ) { | |
749 // byte, short & char stores truncate naturally. | |
750 // A load has to load the truncated value which requires | |
751 // some sort of masking operation and that requires an | |
752 // Ideal call instead of an Identity call. | |
753 if (memory_size() < BytesPerInt) { | |
754 // If the input to the store does not fit with the load's result type, | |
755 // it must be truncated via an Ideal call. | |
756 if (!phase->type(value)->higher_equal(phase->type(this))) | |
757 return this; | |
758 } | |
759 // (This works even when value is a Con, but LoadNode::Value | |
760 // usually runs first, producing the singleton type of the Con.) | |
761 return value; | |
762 } | |
763 return this; | |
764 } | |
765 | |
17
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
766 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
767 // Returns true if the AliasType refers to the field that holds the |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
768 // cached box array. Currently only handles the IntegerCache case. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
769 static bool is_autobox_cache(Compile::AliasType* atp) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
770 if (atp != NULL && atp->field() != NULL) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
771 ciField* field = atp->field(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
772 ciSymbol* klass = field->holder()->name(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
773 if (field->name() == ciSymbol::cache_field_name() && |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
774 field->holder()->uses_default_loader() && |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
775 klass == ciSymbol::java_lang_Integer_IntegerCache()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
776 return true; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
777 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
778 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
779 return false; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
780 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
781 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
782 // Fetch the base value in the autobox array |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
783 static bool fetch_autobox_base(Compile::AliasType* atp, int& cache_offset) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
784 if (atp != NULL && atp->field() != NULL) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
785 ciField* field = atp->field(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
786 ciSymbol* klass = field->holder()->name(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
787 if (field->name() == ciSymbol::cache_field_name() && |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
788 field->holder()->uses_default_loader() && |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
789 klass == ciSymbol::java_lang_Integer_IntegerCache()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
790 assert(field->is_constant(), "what?"); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
791 ciObjArray* array = field->constant_value().as_object()->as_obj_array(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
792 // Fetch the box object at the base of the array and get its value |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
793 ciInstance* box = array->obj_at(0)->as_instance(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
794 ciInstanceKlass* ik = box->klass()->as_instance_klass(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
795 if (ik->nof_nonstatic_fields() == 1) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
796 // This should be true nonstatic_field_at requires calling |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
797 // nof_nonstatic_fields so check it anyway |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
798 ciConstant c = box->field_value(ik->nonstatic_field_at(0)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
799 cache_offset = c.as_int(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
800 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
801 return true; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
802 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
803 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
804 return false; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
805 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
806 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
807 // Returns true if the AliasType refers to the value field of an |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
808 // autobox object. Currently only handles Integer. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
809 static bool is_autobox_object(Compile::AliasType* atp) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
810 if (atp != NULL && atp->field() != NULL) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
811 ciField* field = atp->field(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
812 ciSymbol* klass = field->holder()->name(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
813 if (field->name() == ciSymbol::value_name() && |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
814 field->holder()->uses_default_loader() && |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
815 klass == ciSymbol::java_lang_Integer()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
816 return true; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
817 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
818 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
819 return false; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
820 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
821 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
822 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
823 // We're loading from an object which has autobox behaviour. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
824 // If this object is result of a valueOf call we'll have a phi |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
825 // merging a newly allocated object and a load from the cache. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
826 // We want to replace this load with the original incoming |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
827 // argument to the valueOf call. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
828 Node* LoadNode::eliminate_autobox(PhaseGVN* phase) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
829 Node* base = in(Address)->in(AddPNode::Base); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
830 if (base->is_Phi() && base->req() == 3) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
831 AllocateNode* allocation = NULL; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
832 int allocation_index = -1; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
833 int load_index = -1; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
834 for (uint i = 1; i < base->req(); i++) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
835 allocation = AllocateNode::Ideal_allocation(base->in(i), phase); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
836 if (allocation != NULL) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
837 allocation_index = i; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
838 load_index = 3 - allocation_index; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
839 break; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
840 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
841 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
842 LoadNode* load = NULL; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
843 if (allocation != NULL && base->in(load_index)->is_Load()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
844 load = base->in(load_index)->as_Load(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
845 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
846 if (load != NULL && in(Memory)->is_Phi() && in(Memory)->in(0) == base->in(0)) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
847 // Push the loads from the phi that comes from valueOf up |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
848 // through it to allow elimination of the loads and the recovery |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
849 // of the original value. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
850 Node* mem_phi = in(Memory); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
851 Node* offset = in(Address)->in(AddPNode::Offset); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
852 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
853 Node* in1 = clone(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
854 Node* in1_addr = in1->in(Address)->clone(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
855 in1_addr->set_req(AddPNode::Base, base->in(allocation_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
856 in1_addr->set_req(AddPNode::Address, base->in(allocation_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
857 in1_addr->set_req(AddPNode::Offset, offset); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
858 in1->set_req(0, base->in(allocation_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
859 in1->set_req(Address, in1_addr); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
860 in1->set_req(Memory, mem_phi->in(allocation_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
861 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
862 Node* in2 = clone(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
863 Node* in2_addr = in2->in(Address)->clone(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
864 in2_addr->set_req(AddPNode::Base, base->in(load_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
865 in2_addr->set_req(AddPNode::Address, base->in(load_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
866 in2_addr->set_req(AddPNode::Offset, offset); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
867 in2->set_req(0, base->in(load_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
868 in2->set_req(Address, in2_addr); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
869 in2->set_req(Memory, mem_phi->in(load_index)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
870 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
871 in1_addr = phase->transform(in1_addr); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
872 in1 = phase->transform(in1); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
873 in2_addr = phase->transform(in2_addr); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
874 in2 = phase->transform(in2); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
875 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
876 PhiNode* result = PhiNode::make_blank(base->in(0), this); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
877 result->set_req(allocation_index, in1); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
878 result->set_req(load_index, in2); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
879 return result; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
880 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
881 } else if (base->is_Load()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
882 // Eliminate the load of Integer.value for integers from the cache |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
883 // array by deriving the value from the index into the array. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
884 // Capture the offset of the load and then reverse the computation. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
885 Node* load_base = base->in(Address)->in(AddPNode::Base); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
886 if (load_base != NULL) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
887 Compile::AliasType* atp = phase->C->alias_type(load_base->adr_type()); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
888 intptr_t cache_offset; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
889 int shift = -1; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
890 Node* cache = NULL; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
891 if (is_autobox_cache(atp)) { |
29
d5fc211aea19
6633953: type2aelembytes{T_ADDRESS} should be 8 bytes in 64 bit VM
kvn
parents:
17
diff
changeset
|
892 shift = exact_log2(type2aelembytes(T_OBJECT)); |
17
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
893 cache = AddPNode::Ideal_base_and_offset(load_base->in(Address), phase, cache_offset); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
894 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
895 if (cache != NULL && base->in(Address)->is_AddP()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
896 Node* elements[4]; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
897 int count = base->in(Address)->as_AddP()->unpack_offsets(elements, ARRAY_SIZE(elements)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
898 int cache_low; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
899 if (count > 0 && fetch_autobox_base(atp, cache_low)) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
900 int offset = arrayOopDesc::base_offset_in_bytes(memory_type()) - (cache_low << shift); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
901 // Add up all the offsets making of the address of the load |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
902 Node* result = elements[0]; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
903 for (int i = 1; i < count; i++) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
904 result = phase->transform(new (phase->C, 3) AddXNode(result, elements[i])); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
905 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
906 // Remove the constant offset from the address and then |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
907 // remove the scaling of the offset to recover the original index. |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
908 result = phase->transform(new (phase->C, 3) AddXNode(result, phase->MakeConX(-offset))); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
909 if (result->Opcode() == Op_LShiftX && result->in(2) == phase->intcon(shift)) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
910 // Peel the shift off directly but wrap it in a dummy node |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
911 // since Ideal can't return existing nodes |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
912 result = new (phase->C, 3) RShiftXNode(result->in(1), phase->intcon(0)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
913 } else { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
914 result = new (phase->C, 3) RShiftXNode(result, phase->intcon(shift)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
915 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
916 #ifdef _LP64 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
917 result = new (phase->C, 2) ConvL2INode(phase->transform(result)); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
918 #endif |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
919 return result; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
920 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
921 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
922 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
923 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
924 return NULL; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
925 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
926 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
927 |
0 | 928 //------------------------------Ideal------------------------------------------ |
929 // If the load is from Field memory and the pointer is non-null, we can | |
930 // zero out the control input. | |
931 // If the offset is constant and the base is an object allocation, | |
932 // try to hook me up to the exact initializing store. | |
933 Node *LoadNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
934 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
935 if (p) return (p == NodeSentinel) ? NULL : p; | |
936 | |
937 Node* ctrl = in(MemNode::Control); | |
938 Node* address = in(MemNode::Address); | |
939 | |
940 // Skip up past a SafePoint control. Cannot do this for Stores because | |
941 // pointer stores & cardmarks must stay on the same side of a SafePoint. | |
942 if( ctrl != NULL && ctrl->Opcode() == Op_SafePoint && | |
943 phase->C->get_alias_index(phase->type(address)->is_ptr()) != Compile::AliasIdxRaw ) { | |
944 ctrl = ctrl->in(0); | |
945 set_req(MemNode::Control,ctrl); | |
946 } | |
947 | |
948 // Check for useless control edge in some common special cases | |
949 if (in(MemNode::Control) != NULL) { | |
950 intptr_t ignore = 0; | |
951 Node* base = AddPNode::Ideal_base_and_offset(address, phase, ignore); | |
952 if (base != NULL | |
953 && phase->type(base)->higher_equal(TypePtr::NOTNULL) | |
954 && detect_dominating_control(base->in(0), phase->C->start())) { | |
955 // A method-invariant, non-null address (constant or 'this' argument). | |
956 set_req(MemNode::Control, NULL); | |
957 } | |
958 } | |
959 | |
17
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
960 if (EliminateAutoBox && can_reshape && in(Address)->is_AddP()) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
961 Node* base = in(Address)->in(AddPNode::Base); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
962 if (base != NULL) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
963 Compile::AliasType* atp = phase->C->alias_type(adr_type()); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
964 if (is_autobox_object(atp)) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
965 Node* result = eliminate_autobox(phase); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
966 if (result != NULL) return result; |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
967 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
968 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
969 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
970 |
0 | 971 // Check for prior store with a different base or offset; make Load |
972 // independent. Skip through any number of them. Bail out if the stores | |
973 // are in an endless dead cycle and report no progress. This is a key | |
974 // transform for Reflection. However, if after skipping through the Stores | |
975 // we can't then fold up against a prior store do NOT do the transform as | |
976 // this amounts to using the 'Oracle' model of aliasing. It leaves the same | |
977 // array memory alive twice: once for the hoisted Load and again after the | |
978 // bypassed Store. This situation only works if EVERYBODY who does | |
979 // anti-dependence work knows how to bypass. I.e. we need all | |
980 // anti-dependence checks to ask the same Oracle. Right now, that Oracle is | |
981 // the alias index stuff. So instead, peek through Stores and IFF we can | |
982 // fold up, do so. | |
983 Node* prev_mem = find_previous_store(phase); | |
984 // Steps (a), (b): Walk past independent stores to find an exact match. | |
985 if (prev_mem != NULL && prev_mem != in(MemNode::Memory)) { | |
986 // (c) See if we can fold up on the spot, but don't fold up here. | |
987 // Fold-up might require truncation (for LoadB/LoadS/LoadC) or | |
988 // just return a prior value, which is done by Identity calls. | |
989 if (can_see_stored_value(prev_mem, phase)) { | |
990 // Make ready for step (d): | |
991 set_req(MemNode::Memory, prev_mem); | |
992 return this; | |
993 } | |
994 } | |
995 | |
996 return NULL; // No further progress | |
997 } | |
998 | |
999 // Helper to recognize certain Klass fields which are invariant across | |
1000 // some group of array types (e.g., int[] or all T[] where T < Object). | |
1001 const Type* | |
1002 LoadNode::load_array_final_field(const TypeKlassPtr *tkls, | |
1003 ciKlass* klass) const { | |
1004 if (tkls->offset() == Klass::modifier_flags_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1005 // The field is Klass::_modifier_flags. Return its (constant) value. | |
1006 // (Folds up the 2nd indirection in aClassConstant.getModifiers().) | |
1007 assert(this->Opcode() == Op_LoadI, "must load an int from _modifier_flags"); | |
1008 return TypeInt::make(klass->modifier_flags()); | |
1009 } | |
1010 if (tkls->offset() == Klass::access_flags_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1011 // The field is Klass::_access_flags. Return its (constant) value. | |
1012 // (Folds up the 2nd indirection in Reflection.getClassAccessFlags(aClassConstant).) | |
1013 assert(this->Opcode() == Op_LoadI, "must load an int from _access_flags"); | |
1014 return TypeInt::make(klass->access_flags()); | |
1015 } | |
1016 if (tkls->offset() == Klass::layout_helper_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1017 // The field is Klass::_layout_helper. Return its constant value if known. | |
1018 assert(this->Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
1019 return TypeInt::make(klass->layout_helper()); | |
1020 } | |
1021 | |
1022 // No match. | |
1023 return NULL; | |
1024 } | |
1025 | |
1026 //------------------------------Value----------------------------------------- | |
1027 const Type *LoadNode::Value( PhaseTransform *phase ) const { | |
1028 // Either input is TOP ==> the result is TOP | |
1029 Node* mem = in(MemNode::Memory); | |
1030 const Type *t1 = phase->type(mem); | |
1031 if (t1 == Type::TOP) return Type::TOP; | |
1032 Node* adr = in(MemNode::Address); | |
1033 const TypePtr* tp = phase->type(adr)->isa_ptr(); | |
1034 if (tp == NULL || tp->empty()) return Type::TOP; | |
1035 int off = tp->offset(); | |
1036 assert(off != Type::OffsetTop, "case covered by TypePtr::empty"); | |
1037 | |
1038 // Try to guess loaded type from pointer type | |
1039 if (tp->base() == Type::AryPtr) { | |
1040 const Type *t = tp->is_aryptr()->elem(); | |
1041 // Don't do this for integer types. There is only potential profit if | |
1042 // the element type t is lower than _type; that is, for int types, if _type is | |
1043 // more restrictive than t. This only happens here if one is short and the other | |
1044 // char (both 16 bits), and in those cases we've made an intentional decision | |
1045 // to use one kind of load over the other. See AndINode::Ideal and 4965907. | |
1046 // Also, do not try to narrow the type for a LoadKlass, regardless of offset. | |
1047 // | |
1048 // Yes, it is possible to encounter an expression like (LoadKlass p1:(AddP x x 8)) | |
1049 // where the _gvn.type of the AddP is wider than 8. This occurs when an earlier | |
1050 // copy p0 of (AddP x x 8) has been proven equal to p1, and the p0 has been | |
1051 // subsumed by p1. If p1 is on the worklist but has not yet been re-transformed, | |
1052 // it is possible that p1 will have a type like Foo*[int+]:NotNull*+any. | |
1053 // In fact, that could have been the original type of p1, and p1 could have | |
1054 // had an original form like p1:(AddP x x (LShiftL quux 3)), where the | |
1055 // expression (LShiftL quux 3) independently optimized to the constant 8. | |
1056 if ((t->isa_int() == NULL) && (t->isa_long() == NULL) | |
1057 && Opcode() != Op_LoadKlass) { | |
1058 // t might actually be lower than _type, if _type is a unique | |
1059 // concrete subclass of abstract class t. | |
1060 // Make sure the reference is not into the header, by comparing | |
1061 // the offset against the offset of the start of the array's data. | |
1062 // Different array types begin at slightly different offsets (12 vs. 16). | |
1063 // We choose T_BYTE as an example base type that is least restrictive | |
1064 // as to alignment, which will therefore produce the smallest | |
1065 // possible base offset. | |
1066 const int min_base_off = arrayOopDesc::base_offset_in_bytes(T_BYTE); | |
1067 if ((uint)off >= (uint)min_base_off) { // is the offset beyond the header? | |
1068 const Type* jt = t->join(_type); | |
1069 // In any case, do not allow the join, per se, to empty out the type. | |
1070 if (jt->empty() && !t->empty()) { | |
1071 // This can happen if a interface-typed array narrows to a class type. | |
1072 jt = _type; | |
1073 } | |
17
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1074 |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1075 if (EliminateAutoBox) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1076 // The pointers in the autobox arrays are always non-null |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1077 Node* base = in(Address)->in(AddPNode::Base); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1078 if (base != NULL) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1079 Compile::AliasType* atp = phase->C->alias_type(base->adr_type()); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1080 if (is_autobox_cache(atp)) { |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1081 return jt->join(TypePtr::NOTNULL)->is_ptr(); |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1082 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1083 } |
ff5961f4c095
6395208: Elide autoboxing for calls to HashMap.get(int) and HashMap.get(long)
never
parents:
0
diff
changeset
|
1084 } |
0 | 1085 return jt; |
1086 } | |
1087 } | |
1088 } else if (tp->base() == Type::InstPtr) { | |
1089 assert( off != Type::OffsetBot || | |
1090 // arrays can be cast to Objects | |
1091 tp->is_oopptr()->klass()->is_java_lang_Object() || | |
1092 // unsafe field access may not have a constant offset | |
1093 phase->C->has_unsafe_access(), | |
1094 "Field accesses must be precise" ); | |
1095 // For oop loads, we expect the _type to be precise | |
1096 } else if (tp->base() == Type::KlassPtr) { | |
1097 assert( off != Type::OffsetBot || | |
1098 // arrays can be cast to Objects | |
1099 tp->is_klassptr()->klass()->is_java_lang_Object() || | |
1100 // also allow array-loading from the primary supertype | |
1101 // array during subtype checks | |
1102 Opcode() == Op_LoadKlass, | |
1103 "Field accesses must be precise" ); | |
1104 // For klass/static loads, we expect the _type to be precise | |
1105 } | |
1106 | |
1107 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
1108 if (tkls != NULL && !StressReflectiveCode) { | |
1109 ciKlass* klass = tkls->klass(); | |
1110 if (klass->is_loaded() && tkls->klass_is_exact()) { | |
1111 // We are loading a field from a Klass metaobject whose identity | |
1112 // is known at compile time (the type is "exact" or "precise"). | |
1113 // Check for fields we know are maintained as constants by the VM. | |
1114 if (tkls->offset() == Klass::super_check_offset_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1115 // The field is Klass::_super_check_offset. Return its (constant) value. | |
1116 // (Folds up type checking code.) | |
1117 assert(Opcode() == Op_LoadI, "must load an int from _super_check_offset"); | |
1118 return TypeInt::make(klass->super_check_offset()); | |
1119 } | |
1120 // Compute index into primary_supers array | |
1121 juint depth = (tkls->offset() - (Klass::primary_supers_offset_in_bytes() + (int)sizeof(oopDesc))) / sizeof(klassOop); | |
1122 // Check for overflowing; use unsigned compare to handle the negative case. | |
1123 if( depth < ciKlass::primary_super_limit() ) { | |
1124 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
1125 // (Folds up type checking code.) | |
1126 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
1127 ciKlass *ss = klass->super_of_depth(depth); | |
1128 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
1129 } | |
1130 const Type* aift = load_array_final_field(tkls, klass); | |
1131 if (aift != NULL) return aift; | |
1132 if (tkls->offset() == in_bytes(arrayKlass::component_mirror_offset()) + (int)sizeof(oopDesc) | |
1133 && klass->is_array_klass()) { | |
1134 // The field is arrayKlass::_component_mirror. Return its (constant) value. | |
1135 // (Folds up aClassConstant.getComponentType, common in Arrays.copyOf.) | |
1136 assert(Opcode() == Op_LoadP, "must load an oop from _component_mirror"); | |
1137 return TypeInstPtr::make(klass->as_array_klass()->component_mirror()); | |
1138 } | |
1139 if (tkls->offset() == Klass::java_mirror_offset_in_bytes() + (int)sizeof(oopDesc)) { | |
1140 // The field is Klass::_java_mirror. Return its (constant) value. | |
1141 // (Folds up the 2nd indirection in anObjConstant.getClass().) | |
1142 assert(Opcode() == Op_LoadP, "must load an oop from _java_mirror"); | |
1143 return TypeInstPtr::make(klass->java_mirror()); | |
1144 } | |
1145 } | |
1146 | |
1147 // We can still check if we are loading from the primary_supers array at a | |
1148 // shallow enough depth. Even though the klass is not exact, entries less | |
1149 // than or equal to its super depth are correct. | |
1150 if (klass->is_loaded() ) { | |
1151 ciType *inner = klass->klass(); | |
1152 while( inner->is_obj_array_klass() ) | |
1153 inner = inner->as_obj_array_klass()->base_element_type(); | |
1154 if( inner->is_instance_klass() && | |
1155 !inner->as_instance_klass()->flags().is_interface() ) { | |
1156 // Compute index into primary_supers array | |
1157 juint depth = (tkls->offset() - (Klass::primary_supers_offset_in_bytes() + (int)sizeof(oopDesc))) / sizeof(klassOop); | |
1158 // Check for overflowing; use unsigned compare to handle the negative case. | |
1159 if( depth < ciKlass::primary_super_limit() && | |
1160 depth <= klass->super_depth() ) { // allow self-depth checks to handle self-check case | |
1161 // The field is an element of Klass::_primary_supers. Return its (constant) value. | |
1162 // (Folds up type checking code.) | |
1163 assert(Opcode() == Op_LoadKlass, "must load a klass from _primary_supers"); | |
1164 ciKlass *ss = klass->super_of_depth(depth); | |
1165 return ss ? TypeKlassPtr::make(ss) : TypePtr::NULL_PTR; | |
1166 } | |
1167 } | |
1168 } | |
1169 | |
1170 // If the type is enough to determine that the thing is not an array, | |
1171 // we can give the layout_helper a positive interval type. | |
1172 // This will help short-circuit some reflective code. | |
1173 if (tkls->offset() == Klass::layout_helper_offset_in_bytes() + (int)sizeof(oopDesc) | |
1174 && !klass->is_array_klass() // not directly typed as an array | |
1175 && !klass->is_interface() // specifically not Serializable & Cloneable | |
1176 && !klass->is_java_lang_Object() // not the supertype of all T[] | |
1177 ) { | |
1178 // Note: When interfaces are reliable, we can narrow the interface | |
1179 // test to (klass != Serializable && klass != Cloneable). | |
1180 assert(Opcode() == Op_LoadI, "must load an int from _layout_helper"); | |
1181 jint min_size = Klass::instance_layout_helper(oopDesc::header_size(), false); | |
1182 // The key property of this type is that it folds up tests | |
1183 // for array-ness, since it proves that the layout_helper is positive. | |
1184 // Thus, a generic value like the basic object layout helper works fine. | |
1185 return TypeInt::make(min_size, max_jint, Type::WidenMin); | |
1186 } | |
1187 } | |
1188 | |
1189 // If we are loading from a freshly-allocated object, produce a zero, | |
1190 // if the load is provably beyond the header of the object. | |
1191 // (Also allow a variable load from a fresh array to produce zero.) | |
1192 if (ReduceFieldZeroing) { | |
1193 Node* value = can_see_stored_value(mem,phase); | |
1194 if (value != NULL && value->is_Con()) | |
1195 return value->bottom_type(); | |
1196 } | |
1197 | |
1198 return _type; | |
1199 } | |
1200 | |
1201 //------------------------------match_edge------------------------------------- | |
1202 // Do we Match on this edge index or not? Match only the address. | |
1203 uint LoadNode::match_edge(uint idx) const { | |
1204 return idx == MemNode::Address; | |
1205 } | |
1206 | |
1207 //--------------------------LoadBNode::Ideal-------------------------------------- | |
1208 // | |
1209 // If the previous store is to the same address as this load, | |
1210 // and the value stored was larger than a byte, replace this load | |
1211 // with the value stored truncated to a byte. If no truncation is | |
1212 // needed, the replacement is done in LoadNode::Identity(). | |
1213 // | |
1214 Node *LoadBNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1215 Node* mem = in(MemNode::Memory); | |
1216 Node* value = can_see_stored_value(mem,phase); | |
1217 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
1218 Node *result = phase->transform( new (phase->C, 3) LShiftINode(value, phase->intcon(24)) ); | |
1219 return new (phase->C, 3) RShiftINode(result, phase->intcon(24)); | |
1220 } | |
1221 // Identity call will handle the case where truncation is not needed. | |
1222 return LoadNode::Ideal(phase, can_reshape); | |
1223 } | |
1224 | |
1225 //--------------------------LoadCNode::Ideal-------------------------------------- | |
1226 // | |
1227 // If the previous store is to the same address as this load, | |
1228 // and the value stored was larger than a char, replace this load | |
1229 // with the value stored truncated to a char. If no truncation is | |
1230 // needed, the replacement is done in LoadNode::Identity(). | |
1231 // | |
1232 Node *LoadCNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1233 Node* mem = in(MemNode::Memory); | |
1234 Node* value = can_see_stored_value(mem,phase); | |
1235 if( value && !phase->type(value)->higher_equal( _type ) ) | |
1236 return new (phase->C, 3) AndINode(value,phase->intcon(0xFFFF)); | |
1237 // Identity call will handle the case where truncation is not needed. | |
1238 return LoadNode::Ideal(phase, can_reshape); | |
1239 } | |
1240 | |
1241 //--------------------------LoadSNode::Ideal-------------------------------------- | |
1242 // | |
1243 // If the previous store is to the same address as this load, | |
1244 // and the value stored was larger than a short, replace this load | |
1245 // with the value stored truncated to a short. If no truncation is | |
1246 // needed, the replacement is done in LoadNode::Identity(). | |
1247 // | |
1248 Node *LoadSNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1249 Node* mem = in(MemNode::Memory); | |
1250 Node* value = can_see_stored_value(mem,phase); | |
1251 if( value && !phase->type(value)->higher_equal( _type ) ) { | |
1252 Node *result = phase->transform( new (phase->C, 3) LShiftINode(value, phase->intcon(16)) ); | |
1253 return new (phase->C, 3) RShiftINode(result, phase->intcon(16)); | |
1254 } | |
1255 // Identity call will handle the case where truncation is not needed. | |
1256 return LoadNode::Ideal(phase, can_reshape); | |
1257 } | |
1258 | |
1259 //============================================================================= | |
1260 //------------------------------Value------------------------------------------ | |
1261 const Type *LoadKlassNode::Value( PhaseTransform *phase ) const { | |
1262 // Either input is TOP ==> the result is TOP | |
1263 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
1264 if (t1 == Type::TOP) return Type::TOP; | |
1265 Node *adr = in(MemNode::Address); | |
1266 const Type *t2 = phase->type( adr ); | |
1267 if (t2 == Type::TOP) return Type::TOP; | |
1268 const TypePtr *tp = t2->is_ptr(); | |
1269 if (TypePtr::above_centerline(tp->ptr()) || | |
1270 tp->ptr() == TypePtr::Null) return Type::TOP; | |
1271 | |
1272 // Return a more precise klass, if possible | |
1273 const TypeInstPtr *tinst = tp->isa_instptr(); | |
1274 if (tinst != NULL) { | |
1275 ciInstanceKlass* ik = tinst->klass()->as_instance_klass(); | |
1276 int offset = tinst->offset(); | |
1277 if (ik == phase->C->env()->Class_klass() | |
1278 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
1279 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
1280 // We are loading a special hidden field from a Class mirror object, | |
1281 // the field which points to the VM's Klass metaobject. | |
1282 ciType* t = tinst->java_mirror_type(); | |
1283 // java_mirror_type returns non-null for compile-time Class constants. | |
1284 if (t != NULL) { | |
1285 // constant oop => constant klass | |
1286 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { | |
1287 return TypeKlassPtr::make(ciArrayKlass::make(t)); | |
1288 } | |
1289 if (!t->is_klass()) { | |
1290 // a primitive Class (e.g., int.class) has NULL for a klass field | |
1291 return TypePtr::NULL_PTR; | |
1292 } | |
1293 // (Folds up the 1st indirection in aClassConstant.getModifiers().) | |
1294 return TypeKlassPtr::make(t->as_klass()); | |
1295 } | |
1296 // non-constant mirror, so we can't tell what's going on | |
1297 } | |
1298 if( !ik->is_loaded() ) | |
1299 return _type; // Bail out if not loaded | |
1300 if (offset == oopDesc::klass_offset_in_bytes()) { | |
1301 if (tinst->klass_is_exact()) { | |
1302 return TypeKlassPtr::make(ik); | |
1303 } | |
1304 // See if we can become precise: no subklasses and no interface | |
1305 // (Note: We need to support verified interfaces.) | |
1306 if (!ik->is_interface() && !ik->has_subklass()) { | |
1307 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1308 // Add a dependence; if any subclass added we need to recompile | |
1309 if (!ik->is_final()) { | |
1310 // %%% should use stronger assert_unique_concrete_subtype instead | |
1311 phase->C->dependencies()->assert_leaf_type(ik); | |
1312 } | |
1313 // Return precise klass | |
1314 return TypeKlassPtr::make(ik); | |
1315 } | |
1316 | |
1317 // Return root of possible klass | |
1318 return TypeKlassPtr::make(TypePtr::NotNull, ik, 0/*offset*/); | |
1319 } | |
1320 } | |
1321 | |
1322 // Check for loading klass from an array | |
1323 const TypeAryPtr *tary = tp->isa_aryptr(); | |
1324 if( tary != NULL ) { | |
1325 ciKlass *tary_klass = tary->klass(); | |
1326 if (tary_klass != NULL // can be NULL when at BOTTOM or TOP | |
1327 && tary->offset() == oopDesc::klass_offset_in_bytes()) { | |
1328 if (tary->klass_is_exact()) { | |
1329 return TypeKlassPtr::make(tary_klass); | |
1330 } | |
1331 ciArrayKlass *ak = tary->klass()->as_array_klass(); | |
1332 // If the klass is an object array, we defer the question to the | |
1333 // array component klass. | |
1334 if( ak->is_obj_array_klass() ) { | |
1335 assert( ak->is_loaded(), "" ); | |
1336 ciKlass *base_k = ak->as_obj_array_klass()->base_element_klass(); | |
1337 if( base_k->is_loaded() && base_k->is_instance_klass() ) { | |
1338 ciInstanceKlass* ik = base_k->as_instance_klass(); | |
1339 // See if we can become precise: no subklasses and no interface | |
1340 if (!ik->is_interface() && !ik->has_subklass()) { | |
1341 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1342 // Add a dependence; if any subclass added we need to recompile | |
1343 if (!ik->is_final()) { | |
1344 phase->C->dependencies()->assert_leaf_type(ik); | |
1345 } | |
1346 // Return precise array klass | |
1347 return TypeKlassPtr::make(ak); | |
1348 } | |
1349 } | |
1350 return TypeKlassPtr::make(TypePtr::NotNull, ak, 0/*offset*/); | |
1351 } else { // Found a type-array? | |
1352 //assert(!UseExactTypes, "this code should be useless with exact types"); | |
1353 assert( ak->is_type_array_klass(), "" ); | |
1354 return TypeKlassPtr::make(ak); // These are always precise | |
1355 } | |
1356 } | |
1357 } | |
1358 | |
1359 // Check for loading klass from an array klass | |
1360 const TypeKlassPtr *tkls = tp->isa_klassptr(); | |
1361 if (tkls != NULL && !StressReflectiveCode) { | |
1362 ciKlass* klass = tkls->klass(); | |
1363 if( !klass->is_loaded() ) | |
1364 return _type; // Bail out if not loaded | |
1365 if( klass->is_obj_array_klass() && | |
1366 (uint)tkls->offset() == objArrayKlass::element_klass_offset_in_bytes() + sizeof(oopDesc)) { | |
1367 ciKlass* elem = klass->as_obj_array_klass()->element_klass(); | |
1368 // // Always returning precise element type is incorrect, | |
1369 // // e.g., element type could be object and array may contain strings | |
1370 // return TypeKlassPtr::make(TypePtr::Constant, elem, 0); | |
1371 | |
1372 // The array's TypeKlassPtr was declared 'precise' or 'not precise' | |
1373 // according to the element type's subclassing. | |
1374 return TypeKlassPtr::make(tkls->ptr(), elem, 0/*offset*/); | |
1375 } | |
1376 if( klass->is_instance_klass() && tkls->klass_is_exact() && | |
1377 (uint)tkls->offset() == Klass::super_offset_in_bytes() + sizeof(oopDesc)) { | |
1378 ciKlass* sup = klass->as_instance_klass()->super(); | |
1379 // The field is Klass::_super. Return its (constant) value. | |
1380 // (Folds up the 2nd indirection in aClassConstant.getSuperClass().) | |
1381 return sup ? TypeKlassPtr::make(sup) : TypePtr::NULL_PTR; | |
1382 } | |
1383 } | |
1384 | |
1385 // Bailout case | |
1386 return LoadNode::Value(phase); | |
1387 } | |
1388 | |
1389 //------------------------------Identity--------------------------------------- | |
1390 // To clean up reflective code, simplify k.java_mirror.as_klass to plain k. | |
1391 // Also feed through the klass in Allocate(...klass...)._klass. | |
1392 Node* LoadKlassNode::Identity( PhaseTransform *phase ) { | |
1393 Node* x = LoadNode::Identity(phase); | |
1394 if (x != this) return x; | |
1395 | |
1396 // Take apart the address into an oop and and offset. | |
1397 // Return 'this' if we cannot. | |
1398 Node* adr = in(MemNode::Address); | |
1399 intptr_t offset = 0; | |
1400 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
1401 if (base == NULL) return this; | |
1402 const TypeOopPtr* toop = phase->type(adr)->isa_oopptr(); | |
1403 if (toop == NULL) return this; | |
1404 | |
1405 // We can fetch the klass directly through an AllocateNode. | |
1406 // This works even if the klass is not constant (clone or newArray). | |
1407 if (offset == oopDesc::klass_offset_in_bytes()) { | |
1408 Node* allocated_klass = AllocateNode::Ideal_klass(base, phase); | |
1409 if (allocated_klass != NULL) { | |
1410 return allocated_klass; | |
1411 } | |
1412 } | |
1413 | |
1414 // Simplify k.java_mirror.as_klass to plain k, where k is a klassOop. | |
1415 // Simplify ak.component_mirror.array_klass to plain ak, ak an arrayKlass. | |
1416 // See inline_native_Class_query for occurrences of these patterns. | |
1417 // Java Example: x.getClass().isAssignableFrom(y) | |
1418 // Java Example: Array.newInstance(x.getClass().getComponentType(), n) | |
1419 // | |
1420 // This improves reflective code, often making the Class | |
1421 // mirror go completely dead. (Current exception: Class | |
1422 // mirrors may appear in debug info, but we could clean them out by | |
1423 // introducing a new debug info operator for klassOop.java_mirror). | |
1424 if (toop->isa_instptr() && toop->klass() == phase->C->env()->Class_klass() | |
1425 && (offset == java_lang_Class::klass_offset_in_bytes() || | |
1426 offset == java_lang_Class::array_klass_offset_in_bytes())) { | |
1427 // We are loading a special hidden field from a Class mirror, | |
1428 // the field which points to its Klass or arrayKlass metaobject. | |
1429 if (base->is_Load()) { | |
1430 Node* adr2 = base->in(MemNode::Address); | |
1431 const TypeKlassPtr* tkls = phase->type(adr2)->isa_klassptr(); | |
1432 if (tkls != NULL && !tkls->empty() | |
1433 && (tkls->klass()->is_instance_klass() || | |
1434 tkls->klass()->is_array_klass()) | |
1435 && adr2->is_AddP() | |
1436 ) { | |
1437 int mirror_field = Klass::java_mirror_offset_in_bytes(); | |
1438 if (offset == java_lang_Class::array_klass_offset_in_bytes()) { | |
1439 mirror_field = in_bytes(arrayKlass::component_mirror_offset()); | |
1440 } | |
1441 if (tkls->offset() == mirror_field + (int)sizeof(oopDesc)) { | |
1442 return adr2->in(AddPNode::Base); | |
1443 } | |
1444 } | |
1445 } | |
1446 } | |
1447 | |
1448 return this; | |
1449 } | |
1450 | |
1451 //------------------------------Value----------------------------------------- | |
1452 const Type *LoadRangeNode::Value( PhaseTransform *phase ) const { | |
1453 // Either input is TOP ==> the result is TOP | |
1454 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
1455 if( t1 == Type::TOP ) return Type::TOP; | |
1456 Node *adr = in(MemNode::Address); | |
1457 const Type *t2 = phase->type( adr ); | |
1458 if( t2 == Type::TOP ) return Type::TOP; | |
1459 const TypePtr *tp = t2->is_ptr(); | |
1460 if (TypePtr::above_centerline(tp->ptr())) return Type::TOP; | |
1461 const TypeAryPtr *tap = tp->isa_aryptr(); | |
1462 if( !tap ) return _type; | |
1463 return tap->size(); | |
1464 } | |
1465 | |
1466 //------------------------------Identity--------------------------------------- | |
1467 // Feed through the length in AllocateArray(...length...)._length. | |
1468 Node* LoadRangeNode::Identity( PhaseTransform *phase ) { | |
1469 Node* x = LoadINode::Identity(phase); | |
1470 if (x != this) return x; | |
1471 | |
1472 // Take apart the address into an oop and and offset. | |
1473 // Return 'this' if we cannot. | |
1474 Node* adr = in(MemNode::Address); | |
1475 intptr_t offset = 0; | |
1476 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset); | |
1477 if (base == NULL) return this; | |
1478 const TypeAryPtr* tary = phase->type(adr)->isa_aryptr(); | |
1479 if (tary == NULL) return this; | |
1480 | |
1481 // We can fetch the length directly through an AllocateArrayNode. | |
1482 // This works even if the length is not constant (clone or newArray). | |
1483 if (offset == arrayOopDesc::length_offset_in_bytes()) { | |
1484 Node* allocated_length = AllocateArrayNode::Ideal_length(base, phase); | |
1485 if (allocated_length != NULL) { | |
1486 return allocated_length; | |
1487 } | |
1488 } | |
1489 | |
1490 return this; | |
1491 | |
1492 } | |
1493 //============================================================================= | |
1494 //---------------------------StoreNode::make----------------------------------- | |
1495 // Polymorphic factory method: | |
1496 StoreNode* StoreNode::make( Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val, BasicType bt ) { | |
1497 switch (bt) { | |
1498 case T_BOOLEAN: | |
1499 case T_BYTE: return new (C, 4) StoreBNode(ctl, mem, adr, adr_type, val); | |
1500 case T_INT: return new (C, 4) StoreINode(ctl, mem, adr, adr_type, val); | |
1501 case T_CHAR: | |
1502 case T_SHORT: return new (C, 4) StoreCNode(ctl, mem, adr, adr_type, val); | |
1503 case T_LONG: return new (C, 4) StoreLNode(ctl, mem, adr, adr_type, val); | |
1504 case T_FLOAT: return new (C, 4) StoreFNode(ctl, mem, adr, adr_type, val); | |
1505 case T_DOUBLE: return new (C, 4) StoreDNode(ctl, mem, adr, adr_type, val); | |
1506 case T_ADDRESS: | |
1507 case T_OBJECT: return new (C, 4) StorePNode(ctl, mem, adr, adr_type, val); | |
1508 } | |
1509 ShouldNotReachHere(); | |
1510 return (StoreNode*)NULL; | |
1511 } | |
1512 | |
1513 StoreLNode* StoreLNode::make_atomic(Compile *C, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, Node* val) { | |
1514 bool require_atomic = true; | |
1515 return new (C, 4) StoreLNode(ctl, mem, adr, adr_type, val, require_atomic); | |
1516 } | |
1517 | |
1518 | |
1519 //--------------------------bottom_type---------------------------------------- | |
1520 const Type *StoreNode::bottom_type() const { | |
1521 return Type::MEMORY; | |
1522 } | |
1523 | |
1524 //------------------------------hash------------------------------------------- | |
1525 uint StoreNode::hash() const { | |
1526 // unroll addition of interesting fields | |
1527 //return (uintptr_t)in(Control) + (uintptr_t)in(Memory) + (uintptr_t)in(Address) + (uintptr_t)in(ValueIn); | |
1528 | |
1529 // Since they are not commoned, do not hash them: | |
1530 return NO_HASH; | |
1531 } | |
1532 | |
1533 //------------------------------Ideal------------------------------------------ | |
1534 // Change back-to-back Store(, p, x) -> Store(m, p, y) to Store(m, p, x). | |
1535 // When a store immediately follows a relevant allocation/initialization, | |
1536 // try to capture it into the initialization, or hoist it above. | |
1537 Node *StoreNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1538 Node* p = MemNode::Ideal_common(phase, can_reshape); | |
1539 if (p) return (p == NodeSentinel) ? NULL : p; | |
1540 | |
1541 Node* mem = in(MemNode::Memory); | |
1542 Node* address = in(MemNode::Address); | |
1543 | |
1544 // Back-to-back stores to same address? Fold em up. | |
1545 // Generally unsafe if I have intervening uses... | |
1546 if (mem->is_Store() && phase->eqv_uncast(mem->in(MemNode::Address), address)) { | |
1547 // Looking at a dead closed cycle of memory? | |
1548 assert(mem != mem->in(MemNode::Memory), "dead loop in StoreNode::Ideal"); | |
1549 | |
1550 assert(Opcode() == mem->Opcode() || | |
1551 phase->C->get_alias_index(adr_type()) == Compile::AliasIdxRaw, | |
1552 "no mismatched stores, except on raw memory"); | |
1553 | |
1554 if (mem->outcnt() == 1 && // check for intervening uses | |
1555 mem->as_Store()->memory_size() <= this->memory_size()) { | |
1556 // If anybody other than 'this' uses 'mem', we cannot fold 'mem' away. | |
1557 // For example, 'mem' might be the final state at a conditional return. | |
1558 // Or, 'mem' might be used by some node which is live at the same time | |
1559 // 'this' is live, which might be unschedulable. So, require exactly | |
1560 // ONE user, the 'this' store, until such time as we clone 'mem' for | |
1561 // each of 'mem's uses (thus making the exactly-1-user-rule hold true). | |
1562 if (can_reshape) { // (%%% is this an anachronism?) | |
1563 set_req_X(MemNode::Memory, mem->in(MemNode::Memory), | |
1564 phase->is_IterGVN()); | |
1565 } else { | |
1566 // It's OK to do this in the parser, since DU info is always accurate, | |
1567 // and the parser always refers to nodes via SafePointNode maps. | |
1568 set_req(MemNode::Memory, mem->in(MemNode::Memory)); | |
1569 } | |
1570 return this; | |
1571 } | |
1572 } | |
1573 | |
1574 // Capture an unaliased, unconditional, simple store into an initializer. | |
1575 // Or, if it is independent of the allocation, hoist it above the allocation. | |
1576 if (ReduceFieldZeroing && /*can_reshape &&*/ | |
1577 mem->is_Proj() && mem->in(0)->is_Initialize()) { | |
1578 InitializeNode* init = mem->in(0)->as_Initialize(); | |
1579 intptr_t offset = init->can_capture_store(this, phase); | |
1580 if (offset > 0) { | |
1581 Node* moved = init->capture_store(this, offset, phase); | |
1582 // If the InitializeNode captured me, it made a raw copy of me, | |
1583 // and I need to disappear. | |
1584 if (moved != NULL) { | |
1585 // %%% hack to ensure that Ideal returns a new node: | |
1586 mem = MergeMemNode::make(phase->C, mem); | |
1587 return mem; // fold me away | |
1588 } | |
1589 } | |
1590 } | |
1591 | |
1592 return NULL; // No further progress | |
1593 } | |
1594 | |
1595 //------------------------------Value----------------------------------------- | |
1596 const Type *StoreNode::Value( PhaseTransform *phase ) const { | |
1597 // Either input is TOP ==> the result is TOP | |
1598 const Type *t1 = phase->type( in(MemNode::Memory) ); | |
1599 if( t1 == Type::TOP ) return Type::TOP; | |
1600 const Type *t2 = phase->type( in(MemNode::Address) ); | |
1601 if( t2 == Type::TOP ) return Type::TOP; | |
1602 const Type *t3 = phase->type( in(MemNode::ValueIn) ); | |
1603 if( t3 == Type::TOP ) return Type::TOP; | |
1604 return Type::MEMORY; | |
1605 } | |
1606 | |
1607 //------------------------------Identity--------------------------------------- | |
1608 // Remove redundant stores: | |
1609 // Store(m, p, Load(m, p)) changes to m. | |
1610 // Store(, p, x) -> Store(m, p, x) changes to Store(m, p, x). | |
1611 Node *StoreNode::Identity( PhaseTransform *phase ) { | |
1612 Node* mem = in(MemNode::Memory); | |
1613 Node* adr = in(MemNode::Address); | |
1614 Node* val = in(MemNode::ValueIn); | |
1615 | |
1616 // Load then Store? Then the Store is useless | |
1617 if (val->is_Load() && | |
1618 phase->eqv_uncast( val->in(MemNode::Address), adr ) && | |
1619 phase->eqv_uncast( val->in(MemNode::Memory ), mem ) && | |
1620 val->as_Load()->store_Opcode() == Opcode()) { | |
1621 return mem; | |
1622 } | |
1623 | |
1624 // Two stores in a row of the same value? | |
1625 if (mem->is_Store() && | |
1626 phase->eqv_uncast( mem->in(MemNode::Address), adr ) && | |
1627 phase->eqv_uncast( mem->in(MemNode::ValueIn), val ) && | |
1628 mem->Opcode() == Opcode()) { | |
1629 return mem; | |
1630 } | |
1631 | |
1632 // Store of zero anywhere into a freshly-allocated object? | |
1633 // Then the store is useless. | |
1634 // (It must already have been captured by the InitializeNode.) | |
1635 if (ReduceFieldZeroing && phase->type(val)->is_zero_type()) { | |
1636 // a newly allocated object is already all-zeroes everywhere | |
1637 if (mem->is_Proj() && mem->in(0)->is_Allocate()) { | |
1638 return mem; | |
1639 } | |
1640 | |
1641 // the store may also apply to zero-bits in an earlier object | |
1642 Node* prev_mem = find_previous_store(phase); | |
1643 // Steps (a), (b): Walk past independent stores to find an exact match. | |
1644 if (prev_mem != NULL) { | |
1645 Node* prev_val = can_see_stored_value(prev_mem, phase); | |
1646 if (prev_val != NULL && phase->eqv(prev_val, val)) { | |
1647 // prev_val and val might differ by a cast; it would be good | |
1648 // to keep the more informative of the two. | |
1649 return mem; | |
1650 } | |
1651 } | |
1652 } | |
1653 | |
1654 return this; | |
1655 } | |
1656 | |
1657 //------------------------------match_edge------------------------------------- | |
1658 // Do we Match on this edge index or not? Match only memory & value | |
1659 uint StoreNode::match_edge(uint idx) const { | |
1660 return idx == MemNode::Address || idx == MemNode::ValueIn; | |
1661 } | |
1662 | |
1663 //------------------------------cmp-------------------------------------------- | |
1664 // Do not common stores up together. They generally have to be split | |
1665 // back up anyways, so do not bother. | |
1666 uint StoreNode::cmp( const Node &n ) const { | |
1667 return (&n == this); // Always fail except on self | |
1668 } | |
1669 | |
1670 //------------------------------Ideal_masked_input----------------------------- | |
1671 // Check for a useless mask before a partial-word store | |
1672 // (StoreB ... (AndI valIn conIa) ) | |
1673 // If (conIa & mask == mask) this simplifies to | |
1674 // (StoreB ... (valIn) ) | |
1675 Node *StoreNode::Ideal_masked_input(PhaseGVN *phase, uint mask) { | |
1676 Node *val = in(MemNode::ValueIn); | |
1677 if( val->Opcode() == Op_AndI ) { | |
1678 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
1679 if( t && t->is_con() && (t->get_con() & mask) == mask ) { | |
1680 set_req(MemNode::ValueIn, val->in(1)); | |
1681 return this; | |
1682 } | |
1683 } | |
1684 return NULL; | |
1685 } | |
1686 | |
1687 | |
1688 //------------------------------Ideal_sign_extended_input---------------------- | |
1689 // Check for useless sign-extension before a partial-word store | |
1690 // (StoreB ... (RShiftI _ (LShiftI _ valIn conIL ) conIR) ) | |
1691 // If (conIL == conIR && conIR <= num_bits) this simplifies to | |
1692 // (StoreB ... (valIn) ) | |
1693 Node *StoreNode::Ideal_sign_extended_input(PhaseGVN *phase, int num_bits) { | |
1694 Node *val = in(MemNode::ValueIn); | |
1695 if( val->Opcode() == Op_RShiftI ) { | |
1696 const TypeInt *t = phase->type( val->in(2) )->isa_int(); | |
1697 if( t && t->is_con() && (t->get_con() <= num_bits) ) { | |
1698 Node *shl = val->in(1); | |
1699 if( shl->Opcode() == Op_LShiftI ) { | |
1700 const TypeInt *t2 = phase->type( shl->in(2) )->isa_int(); | |
1701 if( t2 && t2->is_con() && (t2->get_con() == t->get_con()) ) { | |
1702 set_req(MemNode::ValueIn, shl->in(1)); | |
1703 return this; | |
1704 } | |
1705 } | |
1706 } | |
1707 } | |
1708 return NULL; | |
1709 } | |
1710 | |
1711 //------------------------------value_never_loaded----------------------------------- | |
1712 // Determine whether there are any possible loads of the value stored. | |
1713 // For simplicity, we actually check if there are any loads from the | |
1714 // address stored to, not just for loads of the value stored by this node. | |
1715 // | |
1716 bool StoreNode::value_never_loaded( PhaseTransform *phase) const { | |
1717 Node *adr = in(Address); | |
1718 const TypeOopPtr *adr_oop = phase->type(adr)->isa_oopptr(); | |
1719 if (adr_oop == NULL) | |
1720 return false; | |
1721 if (!adr_oop->is_instance()) | |
1722 return false; // if not a distinct instance, there may be aliases of the address | |
1723 for (DUIterator_Fast imax, i = adr->fast_outs(imax); i < imax; i++) { | |
1724 Node *use = adr->fast_out(i); | |
1725 int opc = use->Opcode(); | |
1726 if (use->is_Load() || use->is_LoadStore()) { | |
1727 return false; | |
1728 } | |
1729 } | |
1730 return true; | |
1731 } | |
1732 | |
1733 //============================================================================= | |
1734 //------------------------------Ideal------------------------------------------ | |
1735 // If the store is from an AND mask that leaves the low bits untouched, then | |
1736 // we can skip the AND operation. If the store is from a sign-extension | |
1737 // (a left shift, then right shift) we can skip both. | |
1738 Node *StoreBNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
1739 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFF); | |
1740 if( progress != NULL ) return progress; | |
1741 | |
1742 progress = StoreNode::Ideal_sign_extended_input(phase, 24); | |
1743 if( progress != NULL ) return progress; | |
1744 | |
1745 // Finally check the default case | |
1746 return StoreNode::Ideal(phase, can_reshape); | |
1747 } | |
1748 | |
1749 //============================================================================= | |
1750 //------------------------------Ideal------------------------------------------ | |
1751 // If the store is from an AND mask that leaves the low bits untouched, then | |
1752 // we can skip the AND operation | |
1753 Node *StoreCNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
1754 Node *progress = StoreNode::Ideal_masked_input(phase, 0xFFFF); | |
1755 if( progress != NULL ) return progress; | |
1756 | |
1757 progress = StoreNode::Ideal_sign_extended_input(phase, 16); | |
1758 if( progress != NULL ) return progress; | |
1759 | |
1760 // Finally check the default case | |
1761 return StoreNode::Ideal(phase, can_reshape); | |
1762 } | |
1763 | |
1764 //============================================================================= | |
1765 //------------------------------Identity--------------------------------------- | |
1766 Node *StoreCMNode::Identity( PhaseTransform *phase ) { | |
1767 // No need to card mark when storing a null ptr | |
1768 Node* my_store = in(MemNode::OopStore); | |
1769 if (my_store->is_Store()) { | |
1770 const Type *t1 = phase->type( my_store->in(MemNode::ValueIn) ); | |
1771 if( t1 == TypePtr::NULL_PTR ) { | |
1772 return in(MemNode::Memory); | |
1773 } | |
1774 } | |
1775 return this; | |
1776 } | |
1777 | |
1778 //------------------------------Value----------------------------------------- | |
1779 const Type *StoreCMNode::Value( PhaseTransform *phase ) const { | |
1780 // If extra input is TOP ==> the result is TOP | |
1781 const Type *t1 = phase->type( in(MemNode::OopStore) ); | |
1782 if( t1 == Type::TOP ) return Type::TOP; | |
1783 | |
1784 return StoreNode::Value( phase ); | |
1785 } | |
1786 | |
1787 | |
1788 //============================================================================= | |
1789 //----------------------------------SCMemProjNode------------------------------ | |
1790 const Type * SCMemProjNode::Value( PhaseTransform *phase ) const | |
1791 { | |
1792 return bottom_type(); | |
1793 } | |
1794 | |
1795 //============================================================================= | |
1796 LoadStoreNode::LoadStoreNode( Node *c, Node *mem, Node *adr, Node *val, Node *ex ) : Node(5) { | |
1797 init_req(MemNode::Control, c ); | |
1798 init_req(MemNode::Memory , mem); | |
1799 init_req(MemNode::Address, adr); | |
1800 init_req(MemNode::ValueIn, val); | |
1801 init_req( ExpectedIn, ex ); | |
1802 init_class_id(Class_LoadStore); | |
1803 | |
1804 } | |
1805 | |
1806 //============================================================================= | |
1807 //-------------------------------adr_type-------------------------------------- | |
1808 // Do we Match on this edge index or not? Do not match memory | |
1809 const TypePtr* ClearArrayNode::adr_type() const { | |
1810 Node *adr = in(3); | |
1811 return MemNode::calculate_adr_type(adr->bottom_type()); | |
1812 } | |
1813 | |
1814 //------------------------------match_edge------------------------------------- | |
1815 // Do we Match on this edge index or not? Do not match memory | |
1816 uint ClearArrayNode::match_edge(uint idx) const { | |
1817 return idx > 1; | |
1818 } | |
1819 | |
1820 //------------------------------Identity--------------------------------------- | |
1821 // Clearing a zero length array does nothing | |
1822 Node *ClearArrayNode::Identity( PhaseTransform *phase ) { | |
1823 return phase->type(in(2))->higher_equal(TypeInt::ZERO) ? in(1) : this; | |
1824 } | |
1825 | |
1826 //------------------------------Idealize--------------------------------------- | |
1827 // Clearing a short array is faster with stores | |
1828 Node *ClearArrayNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
1829 const int unit = BytesPerLong; | |
1830 const TypeX* t = phase->type(in(2))->isa_intptr_t(); | |
1831 if (!t) return NULL; | |
1832 if (!t->is_con()) return NULL; | |
1833 intptr_t raw_count = t->get_con(); | |
1834 intptr_t size = raw_count; | |
1835 if (!Matcher::init_array_count_is_in_bytes) size *= unit; | |
1836 // Clearing nothing uses the Identity call. | |
1837 // Negative clears are possible on dead ClearArrays | |
1838 // (see jck test stmt114.stmt11402.val). | |
1839 if (size <= 0 || size % unit != 0) return NULL; | |
1840 intptr_t count = size / unit; | |
1841 // Length too long; use fast hardware clear | |
1842 if (size > Matcher::init_array_short_size) return NULL; | |
1843 Node *mem = in(1); | |
1844 if( phase->type(mem)==Type::TOP ) return NULL; | |
1845 Node *adr = in(3); | |
1846 const Type* at = phase->type(adr); | |
1847 if( at==Type::TOP ) return NULL; | |
1848 const TypePtr* atp = at->isa_ptr(); | |
1849 // adjust atp to be the correct array element address type | |
1850 if (atp == NULL) atp = TypePtr::BOTTOM; | |
1851 else atp = atp->add_offset(Type::OffsetBot); | |
1852 // Get base for derived pointer purposes | |
1853 if( adr->Opcode() != Op_AddP ) Unimplemented(); | |
1854 Node *base = adr->in(1); | |
1855 | |
1856 Node *zero = phase->makecon(TypeLong::ZERO); | |
1857 Node *off = phase->MakeConX(BytesPerLong); | |
1858 mem = new (phase->C, 4) StoreLNode(in(0),mem,adr,atp,zero); | |
1859 count--; | |
1860 while( count-- ) { | |
1861 mem = phase->transform(mem); | |
1862 adr = phase->transform(new (phase->C, 4) AddPNode(base,adr,off)); | |
1863 mem = new (phase->C, 4) StoreLNode(in(0),mem,adr,atp,zero); | |
1864 } | |
1865 return mem; | |
1866 } | |
1867 | |
1868 //----------------------------clear_memory------------------------------------- | |
1869 // Generate code to initialize object storage to zero. | |
1870 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
1871 intptr_t start_offset, | |
1872 Node* end_offset, | |
1873 PhaseGVN* phase) { | |
1874 Compile* C = phase->C; | |
1875 intptr_t offset = start_offset; | |
1876 | |
1877 int unit = BytesPerLong; | |
1878 if ((offset % unit) != 0) { | |
1879 Node* adr = new (C, 4) AddPNode(dest, dest, phase->MakeConX(offset)); | |
1880 adr = phase->transform(adr); | |
1881 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
1882 mem = StoreNode::make(C, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT); | |
1883 mem = phase->transform(mem); | |
1884 offset += BytesPerInt; | |
1885 } | |
1886 assert((offset % unit) == 0, ""); | |
1887 | |
1888 // Initialize the remaining stuff, if any, with a ClearArray. | |
1889 return clear_memory(ctl, mem, dest, phase->MakeConX(offset), end_offset, phase); | |
1890 } | |
1891 | |
1892 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
1893 Node* start_offset, | |
1894 Node* end_offset, | |
1895 PhaseGVN* phase) { | |
1896 Compile* C = phase->C; | |
1897 int unit = BytesPerLong; | |
1898 Node* zbase = start_offset; | |
1899 Node* zend = end_offset; | |
1900 | |
1901 // Scale to the unit required by the CPU: | |
1902 if (!Matcher::init_array_count_is_in_bytes) { | |
1903 Node* shift = phase->intcon(exact_log2(unit)); | |
1904 zbase = phase->transform( new(C,3) URShiftXNode(zbase, shift) ); | |
1905 zend = phase->transform( new(C,3) URShiftXNode(zend, shift) ); | |
1906 } | |
1907 | |
1908 Node* zsize = phase->transform( new(C,3) SubXNode(zend, zbase) ); | |
1909 Node* zinit = phase->zerocon((unit == BytesPerLong) ? T_LONG : T_INT); | |
1910 | |
1911 // Bulk clear double-words | |
1912 Node* adr = phase->transform( new(C,4) AddPNode(dest, dest, start_offset) ); | |
1913 mem = new (C, 4) ClearArrayNode(ctl, mem, zsize, adr); | |
1914 return phase->transform(mem); | |
1915 } | |
1916 | |
1917 Node* ClearArrayNode::clear_memory(Node* ctl, Node* mem, Node* dest, | |
1918 intptr_t start_offset, | |
1919 intptr_t end_offset, | |
1920 PhaseGVN* phase) { | |
1921 Compile* C = phase->C; | |
1922 assert((end_offset % BytesPerInt) == 0, "odd end offset"); | |
1923 intptr_t done_offset = end_offset; | |
1924 if ((done_offset % BytesPerLong) != 0) { | |
1925 done_offset -= BytesPerInt; | |
1926 } | |
1927 if (done_offset > start_offset) { | |
1928 mem = clear_memory(ctl, mem, dest, | |
1929 start_offset, phase->MakeConX(done_offset), phase); | |
1930 } | |
1931 if (done_offset < end_offset) { // emit the final 32-bit store | |
1932 Node* adr = new (C, 4) AddPNode(dest, dest, phase->MakeConX(done_offset)); | |
1933 adr = phase->transform(adr); | |
1934 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
1935 mem = StoreNode::make(C, ctl, mem, adr, atp, phase->zerocon(T_INT), T_INT); | |
1936 mem = phase->transform(mem); | |
1937 done_offset += BytesPerInt; | |
1938 } | |
1939 assert(done_offset == end_offset, ""); | |
1940 return mem; | |
1941 } | |
1942 | |
1943 //============================================================================= | |
1944 // Do we match on this edge? No memory edges | |
1945 uint StrCompNode::match_edge(uint idx) const { | |
1946 return idx == 5 || idx == 6; | |
1947 } | |
1948 | |
1949 //------------------------------Ideal------------------------------------------ | |
1950 // Return a node which is more "ideal" than the current node. Strip out | |
1951 // control copies | |
1952 Node *StrCompNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
1953 return remove_dead_region(phase, can_reshape) ? this : NULL; | |
1954 } | |
1955 | |
1956 | |
1957 //============================================================================= | |
1958 MemBarNode::MemBarNode(Compile* C, int alias_idx, Node* precedent) | |
1959 : MultiNode(TypeFunc::Parms + (precedent == NULL? 0: 1)), | |
1960 _adr_type(C->get_adr_type(alias_idx)) | |
1961 { | |
1962 init_class_id(Class_MemBar); | |
1963 Node* top = C->top(); | |
1964 init_req(TypeFunc::I_O,top); | |
1965 init_req(TypeFunc::FramePtr,top); | |
1966 init_req(TypeFunc::ReturnAdr,top); | |
1967 if (precedent != NULL) | |
1968 init_req(TypeFunc::Parms, precedent); | |
1969 } | |
1970 | |
1971 //------------------------------cmp-------------------------------------------- | |
1972 uint MemBarNode::hash() const { return NO_HASH; } | |
1973 uint MemBarNode::cmp( const Node &n ) const { | |
1974 return (&n == this); // Always fail except on self | |
1975 } | |
1976 | |
1977 //------------------------------make------------------------------------------- | |
1978 MemBarNode* MemBarNode::make(Compile* C, int opcode, int atp, Node* pn) { | |
1979 int len = Precedent + (pn == NULL? 0: 1); | |
1980 switch (opcode) { | |
1981 case Op_MemBarAcquire: return new(C, len) MemBarAcquireNode(C, atp, pn); | |
1982 case Op_MemBarRelease: return new(C, len) MemBarReleaseNode(C, atp, pn); | |
1983 case Op_MemBarVolatile: return new(C, len) MemBarVolatileNode(C, atp, pn); | |
1984 case Op_MemBarCPUOrder: return new(C, len) MemBarCPUOrderNode(C, atp, pn); | |
1985 case Op_Initialize: return new(C, len) InitializeNode(C, atp, pn); | |
1986 default: ShouldNotReachHere(); return NULL; | |
1987 } | |
1988 } | |
1989 | |
1990 //------------------------------Ideal------------------------------------------ | |
1991 // Return a node which is more "ideal" than the current node. Strip out | |
1992 // control copies | |
1993 Node *MemBarNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1994 if (remove_dead_region(phase, can_reshape)) return this; | |
1995 return NULL; | |
1996 } | |
1997 | |
1998 //------------------------------Value------------------------------------------ | |
1999 const Type *MemBarNode::Value( PhaseTransform *phase ) const { | |
2000 if( !in(0) ) return Type::TOP; | |
2001 if( phase->type(in(0)) == Type::TOP ) | |
2002 return Type::TOP; | |
2003 return TypeTuple::MEMBAR; | |
2004 } | |
2005 | |
2006 //------------------------------match------------------------------------------ | |
2007 // Construct projections for memory. | |
2008 Node *MemBarNode::match( const ProjNode *proj, const Matcher *m ) { | |
2009 switch (proj->_con) { | |
2010 case TypeFunc::Control: | |
2011 case TypeFunc::Memory: | |
2012 return new (m->C, 1) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); | |
2013 } | |
2014 ShouldNotReachHere(); | |
2015 return NULL; | |
2016 } | |
2017 | |
2018 //===========================InitializeNode==================================== | |
2019 // SUMMARY: | |
2020 // This node acts as a memory barrier on raw memory, after some raw stores. | |
2021 // The 'cooked' oop value feeds from the Initialize, not the Allocation. | |
2022 // The Initialize can 'capture' suitably constrained stores as raw inits. | |
2023 // It can coalesce related raw stores into larger units (called 'tiles'). | |
2024 // It can avoid zeroing new storage for memory units which have raw inits. | |
2025 // At macro-expansion, it is marked 'complete', and does not optimize further. | |
2026 // | |
2027 // EXAMPLE: | |
2028 // The object 'new short[2]' occupies 16 bytes in a 32-bit machine. | |
2029 // ctl = incoming control; mem* = incoming memory | |
2030 // (Note: A star * on a memory edge denotes I/O and other standard edges.) | |
2031 // First allocate uninitialized memory and fill in the header: | |
2032 // alloc = (Allocate ctl mem* 16 #short[].klass ...) | |
2033 // ctl := alloc.Control; mem* := alloc.Memory* | |
2034 // rawmem = alloc.Memory; rawoop = alloc.RawAddress | |
2035 // Then initialize to zero the non-header parts of the raw memory block: | |
2036 // init = (Initialize alloc.Control alloc.Memory* alloc.RawAddress) | |
2037 // ctl := init.Control; mem.SLICE(#short[*]) := init.Memory | |
2038 // After the initialize node executes, the object is ready for service: | |
2039 // oop := (CheckCastPP init.Control alloc.RawAddress #short[]) | |
2040 // Suppose its body is immediately initialized as {1,2}: | |
2041 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
2042 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
2043 // mem.SLICE(#short[*]) := store2 | |
2044 // | |
2045 // DETAILS: | |
2046 // An InitializeNode collects and isolates object initialization after | |
2047 // an AllocateNode and before the next possible safepoint. As a | |
2048 // memory barrier (MemBarNode), it keeps critical stores from drifting | |
2049 // down past any safepoint or any publication of the allocation. | |
2050 // Before this barrier, a newly-allocated object may have uninitialized bits. | |
2051 // After this barrier, it may be treated as a real oop, and GC is allowed. | |
2052 // | |
2053 // The semantics of the InitializeNode include an implicit zeroing of | |
2054 // the new object from object header to the end of the object. | |
2055 // (The object header and end are determined by the AllocateNode.) | |
2056 // | |
2057 // Certain stores may be added as direct inputs to the InitializeNode. | |
2058 // These stores must update raw memory, and they must be to addresses | |
2059 // derived from the raw address produced by AllocateNode, and with | |
2060 // a constant offset. They must be ordered by increasing offset. | |
2061 // The first one is at in(RawStores), the last at in(req()-1). | |
2062 // Unlike most memory operations, they are not linked in a chain, | |
2063 // but are displayed in parallel as users of the rawmem output of | |
2064 // the allocation. | |
2065 // | |
2066 // (See comments in InitializeNode::capture_store, which continue | |
2067 // the example given above.) | |
2068 // | |
2069 // When the associated Allocate is macro-expanded, the InitializeNode | |
2070 // may be rewritten to optimize collected stores. A ClearArrayNode | |
2071 // may also be created at that point to represent any required zeroing. | |
2072 // The InitializeNode is then marked 'complete', prohibiting further | |
2073 // capturing of nearby memory operations. | |
2074 // | |
2075 // During macro-expansion, all captured initializations which store | |
2076 // constant values of 32 bits or smaller are coalesced (if advantagous) | |
2077 // into larger 'tiles' 32 or 64 bits. This allows an object to be | |
2078 // initialized in fewer memory operations. Memory words which are | |
2079 // covered by neither tiles nor non-constant stores are pre-zeroed | |
2080 // by explicit stores of zero. (The code shape happens to do all | |
2081 // zeroing first, then all other stores, with both sequences occurring | |
2082 // in order of ascending offsets.) | |
2083 // | |
2084 // Alternatively, code may be inserted between an AllocateNode and its | |
2085 // InitializeNode, to perform arbitrary initialization of the new object. | |
2086 // E.g., the object copying intrinsics insert complex data transfers here. | |
2087 // The initialization must then be marked as 'complete' disable the | |
2088 // built-in zeroing semantics and the collection of initializing stores. | |
2089 // | |
2090 // While an InitializeNode is incomplete, reads from the memory state | |
2091 // produced by it are optimizable if they match the control edge and | |
2092 // new oop address associated with the allocation/initialization. | |
2093 // They return a stored value (if the offset matches) or else zero. | |
2094 // A write to the memory state, if it matches control and address, | |
2095 // and if it is to a constant offset, may be 'captured' by the | |
2096 // InitializeNode. It is cloned as a raw memory operation and rewired | |
2097 // inside the initialization, to the raw oop produced by the allocation. | |
2098 // Operations on addresses which are provably distinct (e.g., to | |
2099 // other AllocateNodes) are allowed to bypass the initialization. | |
2100 // | |
2101 // The effect of all this is to consolidate object initialization | |
2102 // (both arrays and non-arrays, both piecewise and bulk) into a | |
2103 // single location, where it can be optimized as a unit. | |
2104 // | |
2105 // Only stores with an offset less than TrackedInitializationLimit words | |
2106 // will be considered for capture by an InitializeNode. This puts a | |
2107 // reasonable limit on the complexity of optimized initializations. | |
2108 | |
2109 //---------------------------InitializeNode------------------------------------ | |
2110 InitializeNode::InitializeNode(Compile* C, int adr_type, Node* rawoop) | |
2111 : _is_complete(false), | |
2112 MemBarNode(C, adr_type, rawoop) | |
2113 { | |
2114 init_class_id(Class_Initialize); | |
2115 | |
2116 assert(adr_type == Compile::AliasIdxRaw, "only valid atp"); | |
2117 assert(in(RawAddress) == rawoop, "proper init"); | |
2118 // Note: allocation() can be NULL, for secondary initialization barriers | |
2119 } | |
2120 | |
2121 // Since this node is not matched, it will be processed by the | |
2122 // register allocator. Declare that there are no constraints | |
2123 // on the allocation of the RawAddress edge. | |
2124 const RegMask &InitializeNode::in_RegMask(uint idx) const { | |
2125 // This edge should be set to top, by the set_complete. But be conservative. | |
2126 if (idx == InitializeNode::RawAddress) | |
2127 return *(Compile::current()->matcher()->idealreg2spillmask[in(idx)->ideal_reg()]); | |
2128 return RegMask::Empty; | |
2129 } | |
2130 | |
2131 Node* InitializeNode::memory(uint alias_idx) { | |
2132 Node* mem = in(Memory); | |
2133 if (mem->is_MergeMem()) { | |
2134 return mem->as_MergeMem()->memory_at(alias_idx); | |
2135 } else { | |
2136 // incoming raw memory is not split | |
2137 return mem; | |
2138 } | |
2139 } | |
2140 | |
2141 bool InitializeNode::is_non_zero() { | |
2142 if (is_complete()) return false; | |
2143 remove_extra_zeroes(); | |
2144 return (req() > RawStores); | |
2145 } | |
2146 | |
2147 void InitializeNode::set_complete(PhaseGVN* phase) { | |
2148 assert(!is_complete(), "caller responsibility"); | |
2149 _is_complete = true; | |
2150 | |
2151 // After this node is complete, it contains a bunch of | |
2152 // raw-memory initializations. There is no need for | |
2153 // it to have anything to do with non-raw memory effects. | |
2154 // Therefore, tell all non-raw users to re-optimize themselves, | |
2155 // after skipping the memory effects of this initialization. | |
2156 PhaseIterGVN* igvn = phase->is_IterGVN(); | |
2157 if (igvn) igvn->add_users_to_worklist(this); | |
2158 } | |
2159 | |
2160 // convenience function | |
2161 // return false if the init contains any stores already | |
2162 bool AllocateNode::maybe_set_complete(PhaseGVN* phase) { | |
2163 InitializeNode* init = initialization(); | |
2164 if (init == NULL || init->is_complete()) return false; | |
2165 init->remove_extra_zeroes(); | |
2166 // for now, if this allocation has already collected any inits, bail: | |
2167 if (init->is_non_zero()) return false; | |
2168 init->set_complete(phase); | |
2169 return true; | |
2170 } | |
2171 | |
2172 void InitializeNode::remove_extra_zeroes() { | |
2173 if (req() == RawStores) return; | |
2174 Node* zmem = zero_memory(); | |
2175 uint fill = RawStores; | |
2176 for (uint i = fill; i < req(); i++) { | |
2177 Node* n = in(i); | |
2178 if (n->is_top() || n == zmem) continue; // skip | |
2179 if (fill < i) set_req(fill, n); // compact | |
2180 ++fill; | |
2181 } | |
2182 // delete any empty spaces created: | |
2183 while (fill < req()) { | |
2184 del_req(fill); | |
2185 } | |
2186 } | |
2187 | |
2188 // Helper for remembering which stores go with which offsets. | |
2189 intptr_t InitializeNode::get_store_offset(Node* st, PhaseTransform* phase) { | |
2190 if (!st->is_Store()) return -1; // can happen to dead code via subsume_node | |
2191 intptr_t offset = -1; | |
2192 Node* base = AddPNode::Ideal_base_and_offset(st->in(MemNode::Address), | |
2193 phase, offset); | |
2194 if (base == NULL) return -1; // something is dead, | |
2195 if (offset < 0) return -1; // dead, dead | |
2196 return offset; | |
2197 } | |
2198 | |
2199 // Helper for proving that an initialization expression is | |
2200 // "simple enough" to be folded into an object initialization. | |
2201 // Attempts to prove that a store's initial value 'n' can be captured | |
2202 // within the initialization without creating a vicious cycle, such as: | |
2203 // { Foo p = new Foo(); p.next = p; } | |
2204 // True for constants and parameters and small combinations thereof. | |
2205 bool InitializeNode::detect_init_independence(Node* n, | |
2206 bool st_is_pinned, | |
2207 int& count) { | |
2208 if (n == NULL) return true; // (can this really happen?) | |
2209 if (n->is_Proj()) n = n->in(0); | |
2210 if (n == this) return false; // found a cycle | |
2211 if (n->is_Con()) return true; | |
2212 if (n->is_Start()) return true; // params, etc., are OK | |
2213 if (n->is_Root()) return true; // even better | |
2214 | |
2215 Node* ctl = n->in(0); | |
2216 if (ctl != NULL && !ctl->is_top()) { | |
2217 if (ctl->is_Proj()) ctl = ctl->in(0); | |
2218 if (ctl == this) return false; | |
2219 | |
2220 // If we already know that the enclosing memory op is pinned right after | |
2221 // the init, then any control flow that the store has picked up | |
2222 // must have preceded the init, or else be equal to the init. | |
2223 // Even after loop optimizations (which might change control edges) | |
2224 // a store is never pinned *before* the availability of its inputs. | |
2225 if (!MemNode::detect_dominating_control(ctl, this->in(0))) | |
2226 return false; // failed to prove a good control | |
2227 | |
2228 } | |
2229 | |
2230 // Check data edges for possible dependencies on 'this'. | |
2231 if ((count += 1) > 20) return false; // complexity limit | |
2232 for (uint i = 1; i < n->req(); i++) { | |
2233 Node* m = n->in(i); | |
2234 if (m == NULL || m == n || m->is_top()) continue; | |
2235 uint first_i = n->find_edge(m); | |
2236 if (i != first_i) continue; // process duplicate edge just once | |
2237 if (!detect_init_independence(m, st_is_pinned, count)) { | |
2238 return false; | |
2239 } | |
2240 } | |
2241 | |
2242 return true; | |
2243 } | |
2244 | |
2245 // Here are all the checks a Store must pass before it can be moved into | |
2246 // an initialization. Returns zero if a check fails. | |
2247 // On success, returns the (constant) offset to which the store applies, | |
2248 // within the initialized memory. | |
2249 intptr_t InitializeNode::can_capture_store(StoreNode* st, PhaseTransform* phase) { | |
2250 const int FAIL = 0; | |
2251 if (st->req() != MemNode::ValueIn + 1) | |
2252 return FAIL; // an inscrutable StoreNode (card mark?) | |
2253 Node* ctl = st->in(MemNode::Control); | |
2254 if (!(ctl != NULL && ctl->is_Proj() && ctl->in(0) == this)) | |
2255 return FAIL; // must be unconditional after the initialization | |
2256 Node* mem = st->in(MemNode::Memory); | |
2257 if (!(mem->is_Proj() && mem->in(0) == this)) | |
2258 return FAIL; // must not be preceded by other stores | |
2259 Node* adr = st->in(MemNode::Address); | |
2260 intptr_t offset; | |
2261 AllocateNode* alloc = AllocateNode::Ideal_allocation(adr, phase, offset); | |
2262 if (alloc == NULL) | |
2263 return FAIL; // inscrutable address | |
2264 if (alloc != allocation()) | |
2265 return FAIL; // wrong allocation! (store needs to float up) | |
2266 Node* val = st->in(MemNode::ValueIn); | |
2267 int complexity_count = 0; | |
2268 if (!detect_init_independence(val, true, complexity_count)) | |
2269 return FAIL; // stored value must be 'simple enough' | |
2270 | |
2271 return offset; // success | |
2272 } | |
2273 | |
2274 // Find the captured store in(i) which corresponds to the range | |
2275 // [start..start+size) in the initialized object. | |
2276 // If there is one, return its index i. If there isn't, return the | |
2277 // negative of the index where it should be inserted. | |
2278 // Return 0 if the queried range overlaps an initialization boundary | |
2279 // or if dead code is encountered. | |
2280 // If size_in_bytes is zero, do not bother with overlap checks. | |
2281 int InitializeNode::captured_store_insertion_point(intptr_t start, | |
2282 int size_in_bytes, | |
2283 PhaseTransform* phase) { | |
2284 const int FAIL = 0, MAX_STORE = BytesPerLong; | |
2285 | |
2286 if (is_complete()) | |
2287 return FAIL; // arraycopy got here first; punt | |
2288 | |
2289 assert(allocation() != NULL, "must be present"); | |
2290 | |
2291 // no negatives, no header fields: | |
2292 if (start < (intptr_t) sizeof(oopDesc)) return FAIL; | |
2293 if (start < (intptr_t) sizeof(arrayOopDesc) && | |
2294 start < (intptr_t) allocation()->minimum_header_size()) return FAIL; | |
2295 | |
2296 // after a certain size, we bail out on tracking all the stores: | |
2297 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
2298 if (start >= ti_limit) return FAIL; | |
2299 | |
2300 for (uint i = InitializeNode::RawStores, limit = req(); ; ) { | |
2301 if (i >= limit) return -(int)i; // not found; here is where to put it | |
2302 | |
2303 Node* st = in(i); | |
2304 intptr_t st_off = get_store_offset(st, phase); | |
2305 if (st_off < 0) { | |
2306 if (st != zero_memory()) { | |
2307 return FAIL; // bail out if there is dead garbage | |
2308 } | |
2309 } else if (st_off > start) { | |
2310 // ...we are done, since stores are ordered | |
2311 if (st_off < start + size_in_bytes) { | |
2312 return FAIL; // the next store overlaps | |
2313 } | |
2314 return -(int)i; // not found; here is where to put it | |
2315 } else if (st_off < start) { | |
2316 if (size_in_bytes != 0 && | |
2317 start < st_off + MAX_STORE && | |
2318 start < st_off + st->as_Store()->memory_size()) { | |
2319 return FAIL; // the previous store overlaps | |
2320 } | |
2321 } else { | |
2322 if (size_in_bytes != 0 && | |
2323 st->as_Store()->memory_size() != size_in_bytes) { | |
2324 return FAIL; // mismatched store size | |
2325 } | |
2326 return i; | |
2327 } | |
2328 | |
2329 ++i; | |
2330 } | |
2331 } | |
2332 | |
2333 // Look for a captured store which initializes at the offset 'start' | |
2334 // with the given size. If there is no such store, and no other | |
2335 // initialization interferes, then return zero_memory (the memory | |
2336 // projection of the AllocateNode). | |
2337 Node* InitializeNode::find_captured_store(intptr_t start, int size_in_bytes, | |
2338 PhaseTransform* phase) { | |
2339 assert(stores_are_sane(phase), ""); | |
2340 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
2341 if (i == 0) { | |
2342 return NULL; // something is dead | |
2343 } else if (i < 0) { | |
2344 return zero_memory(); // just primordial zero bits here | |
2345 } else { | |
2346 Node* st = in(i); // here is the store at this position | |
2347 assert(get_store_offset(st->as_Store(), phase) == start, "sanity"); | |
2348 return st; | |
2349 } | |
2350 } | |
2351 | |
2352 // Create, as a raw pointer, an address within my new object at 'offset'. | |
2353 Node* InitializeNode::make_raw_address(intptr_t offset, | |
2354 PhaseTransform* phase) { | |
2355 Node* addr = in(RawAddress); | |
2356 if (offset != 0) { | |
2357 Compile* C = phase->C; | |
2358 addr = phase->transform( new (C, 4) AddPNode(C->top(), addr, | |
2359 phase->MakeConX(offset)) ); | |
2360 } | |
2361 return addr; | |
2362 } | |
2363 | |
2364 // Clone the given store, converting it into a raw store | |
2365 // initializing a field or element of my new object. | |
2366 // Caller is responsible for retiring the original store, | |
2367 // with subsume_node or the like. | |
2368 // | |
2369 // From the example above InitializeNode::InitializeNode, | |
2370 // here are the old stores to be captured: | |
2371 // store1 = (StoreC init.Control init.Memory (+ oop 12) 1) | |
2372 // store2 = (StoreC init.Control store1 (+ oop 14) 2) | |
2373 // | |
2374 // Here is the changed code; note the extra edges on init: | |
2375 // alloc = (Allocate ...) | |
2376 // rawoop = alloc.RawAddress | |
2377 // rawstore1 = (StoreC alloc.Control alloc.Memory (+ rawoop 12) 1) | |
2378 // rawstore2 = (StoreC alloc.Control alloc.Memory (+ rawoop 14) 2) | |
2379 // init = (Initialize alloc.Control alloc.Memory rawoop | |
2380 // rawstore1 rawstore2) | |
2381 // | |
2382 Node* InitializeNode::capture_store(StoreNode* st, intptr_t start, | |
2383 PhaseTransform* phase) { | |
2384 assert(stores_are_sane(phase), ""); | |
2385 | |
2386 if (start < 0) return NULL; | |
2387 assert(can_capture_store(st, phase) == start, "sanity"); | |
2388 | |
2389 Compile* C = phase->C; | |
2390 int size_in_bytes = st->memory_size(); | |
2391 int i = captured_store_insertion_point(start, size_in_bytes, phase); | |
2392 if (i == 0) return NULL; // bail out | |
2393 Node* prev_mem = NULL; // raw memory for the captured store | |
2394 if (i > 0) { | |
2395 prev_mem = in(i); // there is a pre-existing store under this one | |
2396 set_req(i, C->top()); // temporarily disconnect it | |
2397 // See StoreNode::Ideal 'st->outcnt() == 1' for the reason to disconnect. | |
2398 } else { | |
2399 i = -i; // no pre-existing store | |
2400 prev_mem = zero_memory(); // a slice of the newly allocated object | |
2401 if (i > InitializeNode::RawStores && in(i-1) == prev_mem) | |
2402 set_req(--i, C->top()); // reuse this edge; it has been folded away | |
2403 else | |
2404 ins_req(i, C->top()); // build a new edge | |
2405 } | |
2406 Node* new_st = st->clone(); | |
2407 new_st->set_req(MemNode::Control, in(Control)); | |
2408 new_st->set_req(MemNode::Memory, prev_mem); | |
2409 new_st->set_req(MemNode::Address, make_raw_address(start, phase)); | |
2410 new_st = phase->transform(new_st); | |
2411 | |
2412 // At this point, new_st might have swallowed a pre-existing store | |
2413 // at the same offset, or perhaps new_st might have disappeared, | |
2414 // if it redundantly stored the same value (or zero to fresh memory). | |
2415 | |
2416 // In any case, wire it in: | |
2417 set_req(i, new_st); | |
2418 | |
2419 // The caller may now kill the old guy. | |
2420 DEBUG_ONLY(Node* check_st = find_captured_store(start, size_in_bytes, phase)); | |
2421 assert(check_st == new_st || check_st == NULL, "must be findable"); | |
2422 assert(!is_complete(), ""); | |
2423 return new_st; | |
2424 } | |
2425 | |
2426 static bool store_constant(jlong* tiles, int num_tiles, | |
2427 intptr_t st_off, int st_size, | |
2428 jlong con) { | |
2429 if ((st_off & (st_size-1)) != 0) | |
2430 return false; // strange store offset (assume size==2**N) | |
2431 address addr = (address)tiles + st_off; | |
2432 assert(st_off >= 0 && addr+st_size <= (address)&tiles[num_tiles], "oob"); | |
2433 switch (st_size) { | |
2434 case sizeof(jbyte): *(jbyte*) addr = (jbyte) con; break; | |
2435 case sizeof(jchar): *(jchar*) addr = (jchar) con; break; | |
2436 case sizeof(jint): *(jint*) addr = (jint) con; break; | |
2437 case sizeof(jlong): *(jlong*) addr = (jlong) con; break; | |
2438 default: return false; // strange store size (detect size!=2**N here) | |
2439 } | |
2440 return true; // return success to caller | |
2441 } | |
2442 | |
2443 // Coalesce subword constants into int constants and possibly | |
2444 // into long constants. The goal, if the CPU permits, | |
2445 // is to initialize the object with a small number of 64-bit tiles. | |
2446 // Also, convert floating-point constants to bit patterns. | |
2447 // Non-constants are not relevant to this pass. | |
2448 // | |
2449 // In terms of the running example on InitializeNode::InitializeNode | |
2450 // and InitializeNode::capture_store, here is the transformation | |
2451 // of rawstore1 and rawstore2 into rawstore12: | |
2452 // alloc = (Allocate ...) | |
2453 // rawoop = alloc.RawAddress | |
2454 // tile12 = 0x00010002 | |
2455 // rawstore12 = (StoreI alloc.Control alloc.Memory (+ rawoop 12) tile12) | |
2456 // init = (Initialize alloc.Control alloc.Memory rawoop rawstore12) | |
2457 // | |
2458 void | |
2459 InitializeNode::coalesce_subword_stores(intptr_t header_size, | |
2460 Node* size_in_bytes, | |
2461 PhaseGVN* phase) { | |
2462 Compile* C = phase->C; | |
2463 | |
2464 assert(stores_are_sane(phase), ""); | |
2465 // Note: After this pass, they are not completely sane, | |
2466 // since there may be some overlaps. | |
2467 | |
2468 int old_subword = 0, old_long = 0, new_int = 0, new_long = 0; | |
2469 | |
2470 intptr_t ti_limit = (TrackedInitializationLimit * HeapWordSize); | |
2471 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, ti_limit); | |
2472 size_limit = MIN2(size_limit, ti_limit); | |
2473 size_limit = align_size_up(size_limit, BytesPerLong); | |
2474 int num_tiles = size_limit / BytesPerLong; | |
2475 | |
2476 // allocate space for the tile map: | |
2477 const int small_len = DEBUG_ONLY(true ? 3 :) 30; // keep stack frames small | |
2478 jlong tiles_buf[small_len]; | |
2479 Node* nodes_buf[small_len]; | |
2480 jlong inits_buf[small_len]; | |
2481 jlong* tiles = ((num_tiles <= small_len) ? &tiles_buf[0] | |
2482 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
2483 Node** nodes = ((num_tiles <= small_len) ? &nodes_buf[0] | |
2484 : NEW_RESOURCE_ARRAY(Node*, num_tiles)); | |
2485 jlong* inits = ((num_tiles <= small_len) ? &inits_buf[0] | |
2486 : NEW_RESOURCE_ARRAY(jlong, num_tiles)); | |
2487 // tiles: exact bitwise model of all primitive constants | |
2488 // nodes: last constant-storing node subsumed into the tiles model | |
2489 // inits: which bytes (in each tile) are touched by any initializations | |
2490 | |
2491 //// Pass A: Fill in the tile model with any relevant stores. | |
2492 | |
2493 Copy::zero_to_bytes(tiles, sizeof(tiles[0]) * num_tiles); | |
2494 Copy::zero_to_bytes(nodes, sizeof(nodes[0]) * num_tiles); | |
2495 Copy::zero_to_bytes(inits, sizeof(inits[0]) * num_tiles); | |
2496 Node* zmem = zero_memory(); // initially zero memory state | |
2497 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
2498 Node* st = in(i); | |
2499 intptr_t st_off = get_store_offset(st, phase); | |
2500 | |
2501 // Figure out the store's offset and constant value: | |
2502 if (st_off < header_size) continue; //skip (ignore header) | |
2503 if (st->in(MemNode::Memory) != zmem) continue; //skip (odd store chain) | |
2504 int st_size = st->as_Store()->memory_size(); | |
2505 if (st_off + st_size > size_limit) break; | |
2506 | |
2507 // Record which bytes are touched, whether by constant or not. | |
2508 if (!store_constant(inits, num_tiles, st_off, st_size, (jlong) -1)) | |
2509 continue; // skip (strange store size) | |
2510 | |
2511 const Type* val = phase->type(st->in(MemNode::ValueIn)); | |
2512 if (!val->singleton()) continue; //skip (non-con store) | |
2513 BasicType type = val->basic_type(); | |
2514 | |
2515 jlong con = 0; | |
2516 switch (type) { | |
2517 case T_INT: con = val->is_int()->get_con(); break; | |
2518 case T_LONG: con = val->is_long()->get_con(); break; | |
2519 case T_FLOAT: con = jint_cast(val->getf()); break; | |
2520 case T_DOUBLE: con = jlong_cast(val->getd()); break; | |
2521 default: continue; //skip (odd store type) | |
2522 } | |
2523 | |
2524 if (type == T_LONG && Matcher::isSimpleConstant64(con) && | |
2525 st->Opcode() == Op_StoreL) { | |
2526 continue; // This StoreL is already optimal. | |
2527 } | |
2528 | |
2529 // Store down the constant. | |
2530 store_constant(tiles, num_tiles, st_off, st_size, con); | |
2531 | |
2532 intptr_t j = st_off >> LogBytesPerLong; | |
2533 | |
2534 if (type == T_INT && st_size == BytesPerInt | |
2535 && (st_off & BytesPerInt) == BytesPerInt) { | |
2536 jlong lcon = tiles[j]; | |
2537 if (!Matcher::isSimpleConstant64(lcon) && | |
2538 st->Opcode() == Op_StoreI) { | |
2539 // This StoreI is already optimal by itself. | |
2540 jint* intcon = (jint*) &tiles[j]; | |
2541 intcon[1] = 0; // undo the store_constant() | |
2542 | |
2543 // If the previous store is also optimal by itself, back up and | |
2544 // undo the action of the previous loop iteration... if we can. | |
2545 // But if we can't, just let the previous half take care of itself. | |
2546 st = nodes[j]; | |
2547 st_off -= BytesPerInt; | |
2548 con = intcon[0]; | |
2549 if (con != 0 && st != NULL && st->Opcode() == Op_StoreI) { | |
2550 assert(st_off >= header_size, "still ignoring header"); | |
2551 assert(get_store_offset(st, phase) == st_off, "must be"); | |
2552 assert(in(i-1) == zmem, "must be"); | |
2553 DEBUG_ONLY(const Type* tcon = phase->type(st->in(MemNode::ValueIn))); | |
2554 assert(con == tcon->is_int()->get_con(), "must be"); | |
2555 // Undo the effects of the previous loop trip, which swallowed st: | |
2556 intcon[0] = 0; // undo store_constant() | |
2557 set_req(i-1, st); // undo set_req(i, zmem) | |
2558 nodes[j] = NULL; // undo nodes[j] = st | |
2559 --old_subword; // undo ++old_subword | |
2560 } | |
2561 continue; // This StoreI is already optimal. | |
2562 } | |
2563 } | |
2564 | |
2565 // This store is not needed. | |
2566 set_req(i, zmem); | |
2567 nodes[j] = st; // record for the moment | |
2568 if (st_size < BytesPerLong) // something has changed | |
2569 ++old_subword; // includes int/float, but who's counting... | |
2570 else ++old_long; | |
2571 } | |
2572 | |
2573 if ((old_subword + old_long) == 0) | |
2574 return; // nothing more to do | |
2575 | |
2576 //// Pass B: Convert any non-zero tiles into optimal constant stores. | |
2577 // Be sure to insert them before overlapping non-constant stores. | |
2578 // (E.g., byte[] x = { 1,2,y,4 } => x[int 0] = 0x01020004, x[2]=y.) | |
2579 for (int j = 0; j < num_tiles; j++) { | |
2580 jlong con = tiles[j]; | |
2581 jlong init = inits[j]; | |
2582 if (con == 0) continue; | |
2583 jint con0, con1; // split the constant, address-wise | |
2584 jint init0, init1; // split the init map, address-wise | |
2585 { union { jlong con; jint intcon[2]; } u; | |
2586 u.con = con; | |
2587 con0 = u.intcon[0]; | |
2588 con1 = u.intcon[1]; | |
2589 u.con = init; | |
2590 init0 = u.intcon[0]; | |
2591 init1 = u.intcon[1]; | |
2592 } | |
2593 | |
2594 Node* old = nodes[j]; | |
2595 assert(old != NULL, "need the prior store"); | |
2596 intptr_t offset = (j * BytesPerLong); | |
2597 | |
2598 bool split = !Matcher::isSimpleConstant64(con); | |
2599 | |
2600 if (offset < header_size) { | |
2601 assert(offset + BytesPerInt >= header_size, "second int counts"); | |
2602 assert(*(jint*)&tiles[j] == 0, "junk in header"); | |
2603 split = true; // only the second word counts | |
2604 // Example: int a[] = { 42 ... } | |
2605 } else if (con0 == 0 && init0 == -1) { | |
2606 split = true; // first word is covered by full inits | |
2607 // Example: int a[] = { ... foo(), 42 ... } | |
2608 } else if (con1 == 0 && init1 == -1) { | |
2609 split = true; // second word is covered by full inits | |
2610 // Example: int a[] = { ... 42, foo() ... } | |
2611 } | |
2612 | |
2613 // Here's a case where init0 is neither 0 nor -1: | |
2614 // byte a[] = { ... 0,0,foo(),0, 0,0,0,42 ... } | |
2615 // Assuming big-endian memory, init0, init1 are 0x0000FF00, 0x000000FF. | |
2616 // In this case the tile is not split; it is (jlong)42. | |
2617 // The big tile is stored down, and then the foo() value is inserted. | |
2618 // (If there were foo(),foo() instead of foo(),0, init0 would be -1.) | |
2619 | |
2620 Node* ctl = old->in(MemNode::Control); | |
2621 Node* adr = make_raw_address(offset, phase); | |
2622 const TypePtr* atp = TypeRawPtr::BOTTOM; | |
2623 | |
2624 // One or two coalesced stores to plop down. | |
2625 Node* st[2]; | |
2626 intptr_t off[2]; | |
2627 int nst = 0; | |
2628 if (!split) { | |
2629 ++new_long; | |
2630 off[nst] = offset; | |
2631 st[nst++] = StoreNode::make(C, ctl, zmem, adr, atp, | |
2632 phase->longcon(con), T_LONG); | |
2633 } else { | |
2634 // Omit either if it is a zero. | |
2635 if (con0 != 0) { | |
2636 ++new_int; | |
2637 off[nst] = offset; | |
2638 st[nst++] = StoreNode::make(C, ctl, zmem, adr, atp, | |
2639 phase->intcon(con0), T_INT); | |
2640 } | |
2641 if (con1 != 0) { | |
2642 ++new_int; | |
2643 offset += BytesPerInt; | |
2644 adr = make_raw_address(offset, phase); | |
2645 off[nst] = offset; | |
2646 st[nst++] = StoreNode::make(C, ctl, zmem, adr, atp, | |
2647 phase->intcon(con1), T_INT); | |
2648 } | |
2649 } | |
2650 | |
2651 // Insert second store first, then the first before the second. | |
2652 // Insert each one just before any overlapping non-constant stores. | |
2653 while (nst > 0) { | |
2654 Node* st1 = st[--nst]; | |
2655 C->copy_node_notes_to(st1, old); | |
2656 st1 = phase->transform(st1); | |
2657 offset = off[nst]; | |
2658 assert(offset >= header_size, "do not smash header"); | |
2659 int ins_idx = captured_store_insertion_point(offset, /*size:*/0, phase); | |
2660 guarantee(ins_idx != 0, "must re-insert constant store"); | |
2661 if (ins_idx < 0) ins_idx = -ins_idx; // never overlap | |
2662 if (ins_idx > InitializeNode::RawStores && in(ins_idx-1) == zmem) | |
2663 set_req(--ins_idx, st1); | |
2664 else | |
2665 ins_req(ins_idx, st1); | |
2666 } | |
2667 } | |
2668 | |
2669 if (PrintCompilation && WizardMode) | |
2670 tty->print_cr("Changed %d/%d subword/long constants into %d/%d int/long", | |
2671 old_subword, old_long, new_int, new_long); | |
2672 if (C->log() != NULL) | |
2673 C->log()->elem("comment that='%d/%d subword/long to %d/%d int/long'", | |
2674 old_subword, old_long, new_int, new_long); | |
2675 | |
2676 // Clean up any remaining occurrences of zmem: | |
2677 remove_extra_zeroes(); | |
2678 } | |
2679 | |
2680 // Explore forward from in(start) to find the first fully initialized | |
2681 // word, and return its offset. Skip groups of subword stores which | |
2682 // together initialize full words. If in(start) is itself part of a | |
2683 // fully initialized word, return the offset of in(start). If there | |
2684 // are no following full-word stores, or if something is fishy, return | |
2685 // a negative value. | |
2686 intptr_t InitializeNode::find_next_fullword_store(uint start, PhaseGVN* phase) { | |
2687 int int_map = 0; | |
2688 intptr_t int_map_off = 0; | |
2689 const int FULL_MAP = right_n_bits(BytesPerInt); // the int_map we hope for | |
2690 | |
2691 for (uint i = start, limit = req(); i < limit; i++) { | |
2692 Node* st = in(i); | |
2693 | |
2694 intptr_t st_off = get_store_offset(st, phase); | |
2695 if (st_off < 0) break; // return conservative answer | |
2696 | |
2697 int st_size = st->as_Store()->memory_size(); | |
2698 if (st_size >= BytesPerInt && (st_off % BytesPerInt) == 0) { | |
2699 return st_off; // we found a complete word init | |
2700 } | |
2701 | |
2702 // update the map: | |
2703 | |
2704 intptr_t this_int_off = align_size_down(st_off, BytesPerInt); | |
2705 if (this_int_off != int_map_off) { | |
2706 // reset the map: | |
2707 int_map = 0; | |
2708 int_map_off = this_int_off; | |
2709 } | |
2710 | |
2711 int subword_off = st_off - this_int_off; | |
2712 int_map |= right_n_bits(st_size) << subword_off; | |
2713 if ((int_map & FULL_MAP) == FULL_MAP) { | |
2714 return this_int_off; // we found a complete word init | |
2715 } | |
2716 | |
2717 // Did this store hit or cross the word boundary? | |
2718 intptr_t next_int_off = align_size_down(st_off + st_size, BytesPerInt); | |
2719 if (next_int_off == this_int_off + BytesPerInt) { | |
2720 // We passed the current int, without fully initializing it. | |
2721 int_map_off = next_int_off; | |
2722 int_map >>= BytesPerInt; | |
2723 } else if (next_int_off > this_int_off + BytesPerInt) { | |
2724 // We passed the current and next int. | |
2725 return this_int_off + BytesPerInt; | |
2726 } | |
2727 } | |
2728 | |
2729 return -1; | |
2730 } | |
2731 | |
2732 | |
2733 // Called when the associated AllocateNode is expanded into CFG. | |
2734 // At this point, we may perform additional optimizations. | |
2735 // Linearize the stores by ascending offset, to make memory | |
2736 // activity as coherent as possible. | |
2737 Node* InitializeNode::complete_stores(Node* rawctl, Node* rawmem, Node* rawptr, | |
2738 intptr_t header_size, | |
2739 Node* size_in_bytes, | |
2740 PhaseGVN* phase) { | |
2741 assert(!is_complete(), "not already complete"); | |
2742 assert(stores_are_sane(phase), ""); | |
2743 assert(allocation() != NULL, "must be present"); | |
2744 | |
2745 remove_extra_zeroes(); | |
2746 | |
2747 if (ReduceFieldZeroing || ReduceBulkZeroing) | |
2748 // reduce instruction count for common initialization patterns | |
2749 coalesce_subword_stores(header_size, size_in_bytes, phase); | |
2750 | |
2751 Node* zmem = zero_memory(); // initially zero memory state | |
2752 Node* inits = zmem; // accumulating a linearized chain of inits | |
2753 #ifdef ASSERT | |
2754 intptr_t last_init_off = sizeof(oopDesc); // previous init offset | |
2755 intptr_t last_init_end = sizeof(oopDesc); // previous init offset+size | |
2756 intptr_t last_tile_end = sizeof(oopDesc); // previous tile offset+size | |
2757 #endif | |
2758 intptr_t zeroes_done = header_size; | |
2759 | |
2760 bool do_zeroing = true; // we might give up if inits are very sparse | |
2761 int big_init_gaps = 0; // how many large gaps have we seen? | |
2762 | |
2763 if (ZeroTLAB) do_zeroing = false; | |
2764 if (!ReduceFieldZeroing && !ReduceBulkZeroing) do_zeroing = false; | |
2765 | |
2766 for (uint i = InitializeNode::RawStores, limit = req(); i < limit; i++) { | |
2767 Node* st = in(i); | |
2768 intptr_t st_off = get_store_offset(st, phase); | |
2769 if (st_off < 0) | |
2770 break; // unknown junk in the inits | |
2771 if (st->in(MemNode::Memory) != zmem) | |
2772 break; // complicated store chains somehow in list | |
2773 | |
2774 int st_size = st->as_Store()->memory_size(); | |
2775 intptr_t next_init_off = st_off + st_size; | |
2776 | |
2777 if (do_zeroing && zeroes_done < next_init_off) { | |
2778 // See if this store needs a zero before it or under it. | |
2779 intptr_t zeroes_needed = st_off; | |
2780 | |
2781 if (st_size < BytesPerInt) { | |
2782 // Look for subword stores which only partially initialize words. | |
2783 // If we find some, we must lay down some word-level zeroes first, | |
2784 // underneath the subword stores. | |
2785 // | |
2786 // Examples: | |
2787 // byte[] a = { p,q,r,s } => a[0]=p,a[1]=q,a[2]=r,a[3]=s | |
2788 // byte[] a = { x,y,0,0 } => a[0..3] = 0, a[0]=x,a[1]=y | |
2789 // byte[] a = { 0,0,z,0 } => a[0..3] = 0, a[2]=z | |
2790 // | |
2791 // Note: coalesce_subword_stores may have already done this, | |
2792 // if it was prompted by constant non-zero subword initializers. | |
2793 // But this case can still arise with non-constant stores. | |
2794 | |
2795 intptr_t next_full_store = find_next_fullword_store(i, phase); | |
2796 | |
2797 // In the examples above: | |
2798 // in(i) p q r s x y z | |
2799 // st_off 12 13 14 15 12 13 14 | |
2800 // st_size 1 1 1 1 1 1 1 | |
2801 // next_full_s. 12 16 16 16 16 16 16 | |
2802 // z's_done 12 16 16 16 12 16 12 | |
2803 // z's_needed 12 16 16 16 16 16 16 | |
2804 // zsize 0 0 0 0 4 0 4 | |
2805 if (next_full_store < 0) { | |
2806 // Conservative tack: Zero to end of current word. | |
2807 zeroes_needed = align_size_up(zeroes_needed, BytesPerInt); | |
2808 } else { | |
2809 // Zero to beginning of next fully initialized word. | |
2810 // Or, don't zero at all, if we are already in that word. | |
2811 assert(next_full_store >= zeroes_needed, "must go forward"); | |
2812 assert((next_full_store & (BytesPerInt-1)) == 0, "even boundary"); | |
2813 zeroes_needed = next_full_store; | |
2814 } | |
2815 } | |
2816 | |
2817 if (zeroes_needed > zeroes_done) { | |
2818 intptr_t zsize = zeroes_needed - zeroes_done; | |
2819 // Do some incremental zeroing on rawmem, in parallel with inits. | |
2820 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
2821 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
2822 zeroes_done, zeroes_needed, | |
2823 phase); | |
2824 zeroes_done = zeroes_needed; | |
2825 if (zsize > Matcher::init_array_short_size && ++big_init_gaps > 2) | |
2826 do_zeroing = false; // leave the hole, next time | |
2827 } | |
2828 } | |
2829 | |
2830 // Collect the store and move on: | |
2831 st->set_req(MemNode::Memory, inits); | |
2832 inits = st; // put it on the linearized chain | |
2833 set_req(i, zmem); // unhook from previous position | |
2834 | |
2835 if (zeroes_done == st_off) | |
2836 zeroes_done = next_init_off; | |
2837 | |
2838 assert(!do_zeroing || zeroes_done >= next_init_off, "don't miss any"); | |
2839 | |
2840 #ifdef ASSERT | |
2841 // Various order invariants. Weaker than stores_are_sane because | |
2842 // a large constant tile can be filled in by smaller non-constant stores. | |
2843 assert(st_off >= last_init_off, "inits do not reverse"); | |
2844 last_init_off = st_off; | |
2845 const Type* val = NULL; | |
2846 if (st_size >= BytesPerInt && | |
2847 (val = phase->type(st->in(MemNode::ValueIn)))->singleton() && | |
2848 (int)val->basic_type() < (int)T_OBJECT) { | |
2849 assert(st_off >= last_tile_end, "tiles do not overlap"); | |
2850 assert(st_off >= last_init_end, "tiles do not overwrite inits"); | |
2851 last_tile_end = MAX2(last_tile_end, next_init_off); | |
2852 } else { | |
2853 intptr_t st_tile_end = align_size_up(next_init_off, BytesPerLong); | |
2854 assert(st_tile_end >= last_tile_end, "inits stay with tiles"); | |
2855 assert(st_off >= last_init_end, "inits do not overlap"); | |
2856 last_init_end = next_init_off; // it's a non-tile | |
2857 } | |
2858 #endif //ASSERT | |
2859 } | |
2860 | |
2861 remove_extra_zeroes(); // clear out all the zmems left over | |
2862 add_req(inits); | |
2863 | |
2864 if (!ZeroTLAB) { | |
2865 // If anything remains to be zeroed, zero it all now. | |
2866 zeroes_done = align_size_down(zeroes_done, BytesPerInt); | |
2867 // if it is the last unused 4 bytes of an instance, forget about it | |
2868 intptr_t size_limit = phase->find_intptr_t_con(size_in_bytes, max_jint); | |
2869 if (zeroes_done + BytesPerLong >= size_limit) { | |
2870 assert(allocation() != NULL, ""); | |
2871 Node* klass_node = allocation()->in(AllocateNode::KlassNode); | |
2872 ciKlass* k = phase->type(klass_node)->is_klassptr()->klass(); | |
2873 if (zeroes_done == k->layout_helper()) | |
2874 zeroes_done = size_limit; | |
2875 } | |
2876 if (zeroes_done < size_limit) { | |
2877 rawmem = ClearArrayNode::clear_memory(rawctl, rawmem, rawptr, | |
2878 zeroes_done, size_in_bytes, phase); | |
2879 } | |
2880 } | |
2881 | |
2882 set_complete(phase); | |
2883 return rawmem; | |
2884 } | |
2885 | |
2886 | |
2887 #ifdef ASSERT | |
2888 bool InitializeNode::stores_are_sane(PhaseTransform* phase) { | |
2889 if (is_complete()) | |
2890 return true; // stores could be anything at this point | |
2891 intptr_t last_off = sizeof(oopDesc); | |
2892 for (uint i = InitializeNode::RawStores; i < req(); i++) { | |
2893 Node* st = in(i); | |
2894 intptr_t st_off = get_store_offset(st, phase); | |
2895 if (st_off < 0) continue; // ignore dead garbage | |
2896 if (last_off > st_off) { | |
2897 tty->print_cr("*** bad store offset at %d: %d > %d", i, last_off, st_off); | |
2898 this->dump(2); | |
2899 assert(false, "ascending store offsets"); | |
2900 return false; | |
2901 } | |
2902 last_off = st_off + st->as_Store()->memory_size(); | |
2903 } | |
2904 return true; | |
2905 } | |
2906 #endif //ASSERT | |
2907 | |
2908 | |
2909 | |
2910 | |
2911 //============================MergeMemNode===================================== | |
2912 // | |
2913 // SEMANTICS OF MEMORY MERGES: A MergeMem is a memory state assembled from several | |
2914 // contributing store or call operations. Each contributor provides the memory | |
2915 // state for a particular "alias type" (see Compile::alias_type). For example, | |
2916 // if a MergeMem has an input X for alias category #6, then any memory reference | |
2917 // to alias category #6 may use X as its memory state input, as an exact equivalent | |
2918 // to using the MergeMem as a whole. | |
2919 // Load<6>( MergeMem(<6>: X, ...), p ) <==> Load<6>(X,p) | |
2920 // | |
2921 // (Here, the <N> notation gives the index of the relevant adr_type.) | |
2922 // | |
2923 // In one special case (and more cases in the future), alias categories overlap. | |
2924 // The special alias category "Bot" (Compile::AliasIdxBot) includes all memory | |
2925 // states. Therefore, if a MergeMem has only one contributing input W for Bot, | |
2926 // it is exactly equivalent to that state W: | |
2927 // MergeMem(<Bot>: W) <==> W | |
2928 // | |
2929 // Usually, the merge has more than one input. In that case, where inputs | |
2930 // overlap (i.e., one is Bot), the narrower alias type determines the memory | |
2931 // state for that type, and the wider alias type (Bot) fills in everywhere else: | |
2932 // Load<5>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<5>(W,p) | |
2933 // Load<6>( MergeMem(<Bot>: W, <6>: X), p ) <==> Load<6>(X,p) | |
2934 // | |
2935 // A merge can take a "wide" memory state as one of its narrow inputs. | |
2936 // This simply means that the merge observes out only the relevant parts of | |
2937 // the wide input. That is, wide memory states arriving at narrow merge inputs | |
2938 // are implicitly "filtered" or "sliced" as necessary. (This is rare.) | |
2939 // | |
2940 // These rules imply that MergeMem nodes may cascade (via their <Bot> links), | |
2941 // and that memory slices "leak through": | |
2942 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y)) <==> MergeMem(<Bot>: W, <7>: Y) | |
2943 // | |
2944 // But, in such a cascade, repeated memory slices can "block the leak": | |
2945 // MergeMem(<Bot>: MergeMem(<Bot>: W, <7>: Y), <7>: Y') <==> MergeMem(<Bot>: W, <7>: Y') | |
2946 // | |
2947 // In the last example, Y is not part of the combined memory state of the | |
2948 // outermost MergeMem. The system must, of course, prevent unschedulable | |
2949 // memory states from arising, so you can be sure that the state Y is somehow | |
2950 // a precursor to state Y'. | |
2951 // | |
2952 // | |
2953 // REPRESENTATION OF MEMORY MERGES: The indexes used to address the Node::in array | |
2954 // of each MergeMemNode array are exactly the numerical alias indexes, including | |
2955 // but not limited to AliasIdxTop, AliasIdxBot, and AliasIdxRaw. The functions | |
2956 // Compile::alias_type (and kin) produce and manage these indexes. | |
2957 // | |
2958 // By convention, the value of in(AliasIdxTop) (i.e., in(1)) is always the top node. | |
2959 // (Note that this provides quick access to the top node inside MergeMem methods, | |
2960 // without the need to reach out via TLS to Compile::current.) | |
2961 // | |
2962 // As a consequence of what was just described, a MergeMem that represents a full | |
2963 // memory state has an edge in(AliasIdxBot) which is a "wide" memory state, | |
2964 // containing all alias categories. | |
2965 // | |
2966 // MergeMem nodes never (?) have control inputs, so in(0) is NULL. | |
2967 // | |
2968 // All other edges in(N) (including in(AliasIdxRaw), which is in(3)) are either | |
2969 // a memory state for the alias type <N>, or else the top node, meaning that | |
2970 // there is no particular input for that alias type. Note that the length of | |
2971 // a MergeMem is variable, and may be extended at any time to accommodate new | |
2972 // memory states at larger alias indexes. When merges grow, they are of course | |
2973 // filled with "top" in the unused in() positions. | |
2974 // | |
2975 // This use of top is named "empty_memory()", or "empty_mem" (no-memory) as a variable. | |
2976 // (Top was chosen because it works smoothly with passes like GCM.) | |
2977 // | |
2978 // For convenience, we hardwire the alias index for TypeRawPtr::BOTTOM. (It is | |
2979 // the type of random VM bits like TLS references.) Since it is always the | |
2980 // first non-Bot memory slice, some low-level loops use it to initialize an | |
2981 // index variable: for (i = AliasIdxRaw; i < req(); i++). | |
2982 // | |
2983 // | |
2984 // ACCESSORS: There is a special accessor MergeMemNode::base_memory which returns | |
2985 // the distinguished "wide" state. The accessor MergeMemNode::memory_at(N) returns | |
2986 // the memory state for alias type <N>, or (if there is no particular slice at <N>, | |
2987 // it returns the base memory. To prevent bugs, memory_at does not accept <Top> | |
2988 // or <Bot> indexes. The iterator MergeMemStream provides robust iteration over | |
2989 // MergeMem nodes or pairs of such nodes, ensuring that the non-top edges are visited. | |
2990 // | |
2991 // %%%% We may get rid of base_memory as a separate accessor at some point; it isn't | |
2992 // really that different from the other memory inputs. An abbreviation called | |
2993 // "bot_memory()" for "memory_at(AliasIdxBot)" would keep code tidy. | |
2994 // | |
2995 // | |
2996 // PARTIAL MEMORY STATES: During optimization, MergeMem nodes may arise that represent | |
2997 // partial memory states. When a Phi splits through a MergeMem, the copy of the Phi | |
2998 // that "emerges though" the base memory will be marked as excluding the alias types | |
2999 // of the other (narrow-memory) copies which "emerged through" the narrow edges: | |
3000 // | |
3001 // Phi<Bot>(U, MergeMem(<Bot>: W, <8>: Y)) | |
3002 // ==Ideal=> MergeMem(<Bot>: Phi<Bot-8>(U, W), Phi<8>(U, Y)) | |
3003 // | |
3004 // This strange "subtraction" effect is necessary to ensure IGVN convergence. | |
3005 // (It is currently unimplemented.) As you can see, the resulting merge is | |
3006 // actually a disjoint union of memory states, rather than an overlay. | |
3007 // | |
3008 | |
3009 //------------------------------MergeMemNode----------------------------------- | |
3010 Node* MergeMemNode::make_empty_memory() { | |
3011 Node* empty_memory = (Node*) Compile::current()->top(); | |
3012 assert(empty_memory->is_top(), "correct sentinel identity"); | |
3013 return empty_memory; | |
3014 } | |
3015 | |
3016 MergeMemNode::MergeMemNode(Node *new_base) : Node(1+Compile::AliasIdxRaw) { | |
3017 init_class_id(Class_MergeMem); | |
3018 // all inputs are nullified in Node::Node(int) | |
3019 // set_input(0, NULL); // no control input | |
3020 | |
3021 // Initialize the edges uniformly to top, for starters. | |
3022 Node* empty_mem = make_empty_memory(); | |
3023 for (uint i = Compile::AliasIdxTop; i < req(); i++) { | |
3024 init_req(i,empty_mem); | |
3025 } | |
3026 assert(empty_memory() == empty_mem, ""); | |
3027 | |
3028 if( new_base != NULL && new_base->is_MergeMem() ) { | |
3029 MergeMemNode* mdef = new_base->as_MergeMem(); | |
3030 assert(mdef->empty_memory() == empty_mem, "consistent sentinels"); | |
3031 for (MergeMemStream mms(this, mdef); mms.next_non_empty2(); ) { | |
3032 mms.set_memory(mms.memory2()); | |
3033 } | |
3034 assert(base_memory() == mdef->base_memory(), ""); | |
3035 } else { | |
3036 set_base_memory(new_base); | |
3037 } | |
3038 } | |
3039 | |
3040 // Make a new, untransformed MergeMem with the same base as 'mem'. | |
3041 // If mem is itself a MergeMem, populate the result with the same edges. | |
3042 MergeMemNode* MergeMemNode::make(Compile* C, Node* mem) { | |
3043 return new(C, 1+Compile::AliasIdxRaw) MergeMemNode(mem); | |
3044 } | |
3045 | |
3046 //------------------------------cmp-------------------------------------------- | |
3047 uint MergeMemNode::hash() const { return NO_HASH; } | |
3048 uint MergeMemNode::cmp( const Node &n ) const { | |
3049 return (&n == this); // Always fail except on self | |
3050 } | |
3051 | |
3052 //------------------------------Identity--------------------------------------- | |
3053 Node* MergeMemNode::Identity(PhaseTransform *phase) { | |
3054 // Identity if this merge point does not record any interesting memory | |
3055 // disambiguations. | |
3056 Node* base_mem = base_memory(); | |
3057 Node* empty_mem = empty_memory(); | |
3058 if (base_mem != empty_mem) { // Memory path is not dead? | |
3059 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3060 Node* mem = in(i); | |
3061 if (mem != empty_mem && mem != base_mem) { | |
3062 return this; // Many memory splits; no change | |
3063 } | |
3064 } | |
3065 } | |
3066 return base_mem; // No memory splits; ID on the one true input | |
3067 } | |
3068 | |
3069 //------------------------------Ideal------------------------------------------ | |
3070 // This method is invoked recursively on chains of MergeMem nodes | |
3071 Node *MergeMemNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
3072 // Remove chain'd MergeMems | |
3073 // | |
3074 // This is delicate, because the each "in(i)" (i >= Raw) is interpreted | |
3075 // relative to the "in(Bot)". Since we are patching both at the same time, | |
3076 // we have to be careful to read each "in(i)" relative to the old "in(Bot)", | |
3077 // but rewrite each "in(i)" relative to the new "in(Bot)". | |
3078 Node *progress = NULL; | |
3079 | |
3080 | |
3081 Node* old_base = base_memory(); | |
3082 Node* empty_mem = empty_memory(); | |
3083 if (old_base == empty_mem) | |
3084 return NULL; // Dead memory path. | |
3085 | |
3086 MergeMemNode* old_mbase; | |
3087 if (old_base != NULL && old_base->is_MergeMem()) | |
3088 old_mbase = old_base->as_MergeMem(); | |
3089 else | |
3090 old_mbase = NULL; | |
3091 Node* new_base = old_base; | |
3092 | |
3093 // simplify stacked MergeMems in base memory | |
3094 if (old_mbase) new_base = old_mbase->base_memory(); | |
3095 | |
3096 // the base memory might contribute new slices beyond my req() | |
3097 if (old_mbase) grow_to_match(old_mbase); | |
3098 | |
3099 // Look carefully at the base node if it is a phi. | |
3100 PhiNode* phi_base; | |
3101 if (new_base != NULL && new_base->is_Phi()) | |
3102 phi_base = new_base->as_Phi(); | |
3103 else | |
3104 phi_base = NULL; | |
3105 | |
3106 Node* phi_reg = NULL; | |
3107 uint phi_len = (uint)-1; | |
3108 if (phi_base != NULL && !phi_base->is_copy()) { | |
3109 // do not examine phi if degraded to a copy | |
3110 phi_reg = phi_base->region(); | |
3111 phi_len = phi_base->req(); | |
3112 // see if the phi is unfinished | |
3113 for (uint i = 1; i < phi_len; i++) { | |
3114 if (phi_base->in(i) == NULL) { | |
3115 // incomplete phi; do not look at it yet! | |
3116 phi_reg = NULL; | |
3117 phi_len = (uint)-1; | |
3118 break; | |
3119 } | |
3120 } | |
3121 } | |
3122 | |
3123 // Note: We do not call verify_sparse on entry, because inputs | |
3124 // can normalize to the base_memory via subsume_node or similar | |
3125 // mechanisms. This method repairs that damage. | |
3126 | |
3127 assert(!old_mbase || old_mbase->is_empty_memory(empty_mem), "consistent sentinels"); | |
3128 | |
3129 // Look at each slice. | |
3130 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3131 Node* old_in = in(i); | |
3132 // calculate the old memory value | |
3133 Node* old_mem = old_in; | |
3134 if (old_mem == empty_mem) old_mem = old_base; | |
3135 assert(old_mem == memory_at(i), ""); | |
3136 | |
3137 // maybe update (reslice) the old memory value | |
3138 | |
3139 // simplify stacked MergeMems | |
3140 Node* new_mem = old_mem; | |
3141 MergeMemNode* old_mmem; | |
3142 if (old_mem != NULL && old_mem->is_MergeMem()) | |
3143 old_mmem = old_mem->as_MergeMem(); | |
3144 else | |
3145 old_mmem = NULL; | |
3146 if (old_mmem == this) { | |
3147 // This can happen if loops break up and safepoints disappear. | |
3148 // A merge of BotPtr (default) with a RawPtr memory derived from a | |
3149 // safepoint can be rewritten to a merge of the same BotPtr with | |
3150 // the BotPtr phi coming into the loop. If that phi disappears | |
3151 // also, we can end up with a self-loop of the mergemem. | |
3152 // In general, if loops degenerate and memory effects disappear, | |
3153 // a mergemem can be left looking at itself. This simply means | |
3154 // that the mergemem's default should be used, since there is | |
3155 // no longer any apparent effect on this slice. | |
3156 // Note: If a memory slice is a MergeMem cycle, it is unreachable | |
3157 // from start. Update the input to TOP. | |
3158 new_mem = (new_base == this || new_base == empty_mem)? empty_mem : new_base; | |
3159 } | |
3160 else if (old_mmem != NULL) { | |
3161 new_mem = old_mmem->memory_at(i); | |
3162 } | |
3163 // else preceeding memory was not a MergeMem | |
3164 | |
3165 // replace equivalent phis (unfortunately, they do not GVN together) | |
3166 if (new_mem != NULL && new_mem != new_base && | |
3167 new_mem->req() == phi_len && new_mem->in(0) == phi_reg) { | |
3168 if (new_mem->is_Phi()) { | |
3169 PhiNode* phi_mem = new_mem->as_Phi(); | |
3170 for (uint i = 1; i < phi_len; i++) { | |
3171 if (phi_base->in(i) != phi_mem->in(i)) { | |
3172 phi_mem = NULL; | |
3173 break; | |
3174 } | |
3175 } | |
3176 if (phi_mem != NULL) { | |
3177 // equivalent phi nodes; revert to the def | |
3178 new_mem = new_base; | |
3179 } | |
3180 } | |
3181 } | |
3182 | |
3183 // maybe store down a new value | |
3184 Node* new_in = new_mem; | |
3185 if (new_in == new_base) new_in = empty_mem; | |
3186 | |
3187 if (new_in != old_in) { | |
3188 // Warning: Do not combine this "if" with the previous "if" | |
3189 // A memory slice might have be be rewritten even if it is semantically | |
3190 // unchanged, if the base_memory value has changed. | |
3191 set_req(i, new_in); | |
3192 progress = this; // Report progress | |
3193 } | |
3194 } | |
3195 | |
3196 if (new_base != old_base) { | |
3197 set_req(Compile::AliasIdxBot, new_base); | |
3198 // Don't use set_base_memory(new_base), because we need to update du. | |
3199 assert(base_memory() == new_base, ""); | |
3200 progress = this; | |
3201 } | |
3202 | |
3203 if( base_memory() == this ) { | |
3204 // a self cycle indicates this memory path is dead | |
3205 set_req(Compile::AliasIdxBot, empty_mem); | |
3206 } | |
3207 | |
3208 // Resolve external cycles by calling Ideal on a MergeMem base_memory | |
3209 // Recursion must occur after the self cycle check above | |
3210 if( base_memory()->is_MergeMem() ) { | |
3211 MergeMemNode *new_mbase = base_memory()->as_MergeMem(); | |
3212 Node *m = phase->transform(new_mbase); // Rollup any cycles | |
3213 if( m != NULL && (m->is_top() || | |
3214 m->is_MergeMem() && m->as_MergeMem()->base_memory() == empty_mem) ) { | |
3215 // propagate rollup of dead cycle to self | |
3216 set_req(Compile::AliasIdxBot, empty_mem); | |
3217 } | |
3218 } | |
3219 | |
3220 if( base_memory() == empty_mem ) { | |
3221 progress = this; | |
3222 // Cut inputs during Parse phase only. | |
3223 // During Optimize phase a dead MergeMem node will be subsumed by Top. | |
3224 if( !can_reshape ) { | |
3225 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3226 if( in(i) != empty_mem ) { set_req(i, empty_mem); } | |
3227 } | |
3228 } | |
3229 } | |
3230 | |
3231 if( !progress && base_memory()->is_Phi() && can_reshape ) { | |
3232 // Check if PhiNode::Ideal's "Split phis through memory merges" | |
3233 // transform should be attempted. Look for this->phi->this cycle. | |
3234 uint merge_width = req(); | |
3235 if (merge_width > Compile::AliasIdxRaw) { | |
3236 PhiNode* phi = base_memory()->as_Phi(); | |
3237 for( uint i = 1; i < phi->req(); ++i ) {// For all paths in | |
3238 if (phi->in(i) == this) { | |
3239 phase->is_IterGVN()->_worklist.push(phi); | |
3240 break; | |
3241 } | |
3242 } | |
3243 } | |
3244 } | |
3245 | |
3246 assert(verify_sparse(), "please, no dups of base"); | |
3247 return progress; | |
3248 } | |
3249 | |
3250 //-------------------------set_base_memory------------------------------------- | |
3251 void MergeMemNode::set_base_memory(Node *new_base) { | |
3252 Node* empty_mem = empty_memory(); | |
3253 set_req(Compile::AliasIdxBot, new_base); | |
3254 assert(memory_at(req()) == new_base, "must set default memory"); | |
3255 // Clear out other occurrences of new_base: | |
3256 if (new_base != empty_mem) { | |
3257 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3258 if (in(i) == new_base) set_req(i, empty_mem); | |
3259 } | |
3260 } | |
3261 } | |
3262 | |
3263 //------------------------------out_RegMask------------------------------------ | |
3264 const RegMask &MergeMemNode::out_RegMask() const { | |
3265 return RegMask::Empty; | |
3266 } | |
3267 | |
3268 //------------------------------dump_spec-------------------------------------- | |
3269 #ifndef PRODUCT | |
3270 void MergeMemNode::dump_spec(outputStream *st) const { | |
3271 st->print(" {"); | |
3272 Node* base_mem = base_memory(); | |
3273 for( uint i = Compile::AliasIdxRaw; i < req(); i++ ) { | |
3274 Node* mem = memory_at(i); | |
3275 if (mem == base_mem) { st->print(" -"); continue; } | |
3276 st->print( " N%d:", mem->_idx ); | |
3277 Compile::current()->get_adr_type(i)->dump_on(st); | |
3278 } | |
3279 st->print(" }"); | |
3280 } | |
3281 #endif // !PRODUCT | |
3282 | |
3283 | |
3284 #ifdef ASSERT | |
3285 static bool might_be_same(Node* a, Node* b) { | |
3286 if (a == b) return true; | |
3287 if (!(a->is_Phi() || b->is_Phi())) return false; | |
3288 // phis shift around during optimization | |
3289 return true; // pretty stupid... | |
3290 } | |
3291 | |
3292 // verify a narrow slice (either incoming or outgoing) | |
3293 static void verify_memory_slice(const MergeMemNode* m, int alias_idx, Node* n) { | |
3294 if (!VerifyAliases) return; // don't bother to verify unless requested | |
3295 if (is_error_reported()) return; // muzzle asserts when debugging an error | |
3296 if (Node::in_dump()) return; // muzzle asserts when printing | |
3297 assert(alias_idx >= Compile::AliasIdxRaw, "must not disturb base_memory or sentinel"); | |
3298 assert(n != NULL, ""); | |
3299 // Elide intervening MergeMem's | |
3300 while (n->is_MergeMem()) { | |
3301 n = n->as_MergeMem()->memory_at(alias_idx); | |
3302 } | |
3303 Compile* C = Compile::current(); | |
3304 const TypePtr* n_adr_type = n->adr_type(); | |
3305 if (n == m->empty_memory()) { | |
3306 // Implicit copy of base_memory() | |
3307 } else if (n_adr_type != TypePtr::BOTTOM) { | |
3308 assert(n_adr_type != NULL, "new memory must have a well-defined adr_type"); | |
3309 assert(C->must_alias(n_adr_type, alias_idx), "new memory must match selected slice"); | |
3310 } else { | |
3311 // A few places like make_runtime_call "know" that VM calls are narrow, | |
3312 // and can be used to update only the VM bits stored as TypeRawPtr::BOTTOM. | |
3313 bool expected_wide_mem = false; | |
3314 if (n == m->base_memory()) { | |
3315 expected_wide_mem = true; | |
3316 } else if (alias_idx == Compile::AliasIdxRaw || | |
3317 n == m->memory_at(Compile::AliasIdxRaw)) { | |
3318 expected_wide_mem = true; | |
3319 } else if (!C->alias_type(alias_idx)->is_rewritable()) { | |
3320 // memory can "leak through" calls on channels that | |
3321 // are write-once. Allow this also. | |
3322 expected_wide_mem = true; | |
3323 } | |
3324 assert(expected_wide_mem, "expected narrow slice replacement"); | |
3325 } | |
3326 } | |
3327 #else // !ASSERT | |
3328 #define verify_memory_slice(m,i,n) (0) // PRODUCT version is no-op | |
3329 #endif | |
3330 | |
3331 | |
3332 //-----------------------------memory_at--------------------------------------- | |
3333 Node* MergeMemNode::memory_at(uint alias_idx) const { | |
3334 assert(alias_idx >= Compile::AliasIdxRaw || | |
3335 alias_idx == Compile::AliasIdxBot && Compile::current()->AliasLevel() == 0, | |
3336 "must avoid base_memory and AliasIdxTop"); | |
3337 | |
3338 // Otherwise, it is a narrow slice. | |
3339 Node* n = alias_idx < req() ? in(alias_idx) : empty_memory(); | |
3340 Compile *C = Compile::current(); | |
3341 if (is_empty_memory(n)) { | |
3342 // the array is sparse; empty slots are the "top" node | |
3343 n = base_memory(); | |
3344 assert(Node::in_dump() | |
3345 || n == NULL || n->bottom_type() == Type::TOP | |
3346 || n->adr_type() == TypePtr::BOTTOM | |
3347 || n->adr_type() == TypeRawPtr::BOTTOM | |
3348 || Compile::current()->AliasLevel() == 0, | |
3349 "must be a wide memory"); | |
3350 // AliasLevel == 0 if we are organizing the memory states manually. | |
3351 // See verify_memory_slice for comments on TypeRawPtr::BOTTOM. | |
3352 } else { | |
3353 // make sure the stored slice is sane | |
3354 #ifdef ASSERT | |
3355 if (is_error_reported() || Node::in_dump()) { | |
3356 } else if (might_be_same(n, base_memory())) { | |
3357 // Give it a pass: It is a mostly harmless repetition of the base. | |
3358 // This can arise normally from node subsumption during optimization. | |
3359 } else { | |
3360 verify_memory_slice(this, alias_idx, n); | |
3361 } | |
3362 #endif | |
3363 } | |
3364 return n; | |
3365 } | |
3366 | |
3367 //---------------------------set_memory_at------------------------------------- | |
3368 void MergeMemNode::set_memory_at(uint alias_idx, Node *n) { | |
3369 verify_memory_slice(this, alias_idx, n); | |
3370 Node* empty_mem = empty_memory(); | |
3371 if (n == base_memory()) n = empty_mem; // collapse default | |
3372 uint need_req = alias_idx+1; | |
3373 if (req() < need_req) { | |
3374 if (n == empty_mem) return; // already the default, so do not grow me | |
3375 // grow the sparse array | |
3376 do { | |
3377 add_req(empty_mem); | |
3378 } while (req() < need_req); | |
3379 } | |
3380 set_req( alias_idx, n ); | |
3381 } | |
3382 | |
3383 | |
3384 | |
3385 //--------------------------iteration_setup------------------------------------ | |
3386 void MergeMemNode::iteration_setup(const MergeMemNode* other) { | |
3387 if (other != NULL) { | |
3388 grow_to_match(other); | |
3389 // invariant: the finite support of mm2 is within mm->req() | |
3390 #ifdef ASSERT | |
3391 for (uint i = req(); i < other->req(); i++) { | |
3392 assert(other->is_empty_memory(other->in(i)), "slice left uncovered"); | |
3393 } | |
3394 #endif | |
3395 } | |
3396 // Replace spurious copies of base_memory by top. | |
3397 Node* base_mem = base_memory(); | |
3398 if (base_mem != NULL && !base_mem->is_top()) { | |
3399 for (uint i = Compile::AliasIdxBot+1, imax = req(); i < imax; i++) { | |
3400 if (in(i) == base_mem) | |
3401 set_req(i, empty_memory()); | |
3402 } | |
3403 } | |
3404 } | |
3405 | |
3406 //---------------------------grow_to_match------------------------------------- | |
3407 void MergeMemNode::grow_to_match(const MergeMemNode* other) { | |
3408 Node* empty_mem = empty_memory(); | |
3409 assert(other->is_empty_memory(empty_mem), "consistent sentinels"); | |
3410 // look for the finite support of the other memory | |
3411 for (uint i = other->req(); --i >= req(); ) { | |
3412 if (other->in(i) != empty_mem) { | |
3413 uint new_len = i+1; | |
3414 while (req() < new_len) add_req(empty_mem); | |
3415 break; | |
3416 } | |
3417 } | |
3418 } | |
3419 | |
3420 //---------------------------verify_sparse------------------------------------- | |
3421 #ifndef PRODUCT | |
3422 bool MergeMemNode::verify_sparse() const { | |
3423 assert(is_empty_memory(make_empty_memory()), "sane sentinel"); | |
3424 Node* base_mem = base_memory(); | |
3425 // The following can happen in degenerate cases, since empty==top. | |
3426 if (is_empty_memory(base_mem)) return true; | |
3427 for (uint i = Compile::AliasIdxRaw; i < req(); i++) { | |
3428 assert(in(i) != NULL, "sane slice"); | |
3429 if (in(i) == base_mem) return false; // should have been the sentinel value! | |
3430 } | |
3431 return true; | |
3432 } | |
3433 | |
3434 bool MergeMemStream::match_memory(Node* mem, const MergeMemNode* mm, int idx) { | |
3435 Node* n; | |
3436 n = mm->in(idx); | |
3437 if (mem == n) return true; // might be empty_memory() | |
3438 n = (idx == Compile::AliasIdxBot)? mm->base_memory(): mm->memory_at(idx); | |
3439 if (mem == n) return true; | |
3440 while (n->is_Phi() && (n = n->as_Phi()->is_copy()) != NULL) { | |
3441 if (mem == n) return true; | |
3442 if (n == NULL) break; | |
3443 } | |
3444 return false; | |
3445 } | |
3446 #endif // !PRODUCT |