1 /*
2 * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "compiler/compileLog.hpp"
27 #include "libadt/vectset.hpp"
28 #include "opto/addnode.hpp"
29 #include "opto/arraycopynode.hpp"
30 #include "opto/callnode.hpp"
31 #include "opto/castnode.hpp"
32 #include "opto/cfgnode.hpp"
33 #include "opto/compile.hpp"
34 #include "opto/convertnode.hpp"
35 #include "opto/graphKit.hpp"
36 #include "opto/locknode.hpp"
37 #include "opto/loopnode.hpp"
38 #include "opto/macro.hpp"
39 #include "opto/memnode.hpp"
40 #include "opto/narrowptrnode.hpp"
41 #include "opto/node.hpp"
42 #include "opto/opaquenode.hpp"
43 #include "opto/phaseX.hpp"
44 #include "opto/rootnode.hpp"
45 #include "opto/runtime.hpp"
46 #include "opto/subnode.hpp"
47 #include "opto/type.hpp"
48 #include "runtime/sharedRuntime.hpp"
49
50
51 //
52 // Replace any references to "oldref" in inputs to "use" with "newref".
53 // Returns the number of replacements made.
54 //
55 int PhaseMacroExpand::replace_input(Node *use, Node *oldref, Node *newref) {
56 int nreplacements = 0;
57 uint req = use->req();
58 for (uint j = 0; j < use->len(); j++) {
59 Node *uin = use->in(j);
60 if (uin == oldref) {
61 if (j < req)
62 use->set_req(j, newref);
63 else
64 use->set_prec(j, newref);
65 nreplacements++;
66 } else if (j >= req && uin == NULL) {
67 break;
68 }
69 }
70 return nreplacements;
71 }
72
73 void PhaseMacroExpand::copy_call_debug_info(CallNode *oldcall, CallNode * newcall) {
74 // Copy debug information and adjust JVMState information
75 uint old_dbg_start = oldcall->tf()->domain()->cnt();
76 uint new_dbg_start = newcall->tf()->domain()->cnt();
77 int jvms_adj = new_dbg_start - old_dbg_start;
78 assert (new_dbg_start == newcall->req(), "argument count mismatch");
79
80 // SafePointScalarObject node could be referenced several times in debug info.
81 // Use Dict to record cloned nodes.
82 Dict* sosn_map = new Dict(cmpkey,hashkey);
83 for (uint i = old_dbg_start; i < oldcall->req(); i++) {
84 Node* old_in = oldcall->in(i);
85 // Clone old SafePointScalarObjectNodes, adjusting their field contents.
86 if (old_in != NULL && old_in->is_SafePointScalarObject()) {
87 SafePointScalarObjectNode* old_sosn = old_in->as_SafePointScalarObject();
88 uint old_unique = C->unique();
89 Node* new_in = old_sosn->clone(sosn_map);
90 if (old_unique != C->unique()) { // New node?
91 new_in->set_req(0, C->root()); // reset control edge
92 new_in = transform_later(new_in); // Register new node.
93 }
94 old_in = new_in;
95 }
96 newcall->add_req(old_in);
97 }
98
99 // JVMS may be shared so clone it before we modify it
100 newcall->set_jvms(oldcall->jvms() != NULL ? oldcall->jvms()->clone_deep(C) : NULL);
101 for (JVMState *jvms = newcall->jvms(); jvms != NULL; jvms = jvms->caller()) {
102 jvms->set_map(newcall);
103 jvms->set_locoff(jvms->locoff()+jvms_adj);
104 jvms->set_stkoff(jvms->stkoff()+jvms_adj);
105 jvms->set_monoff(jvms->monoff()+jvms_adj);
106 jvms->set_scloff(jvms->scloff()+jvms_adj);
107 jvms->set_endoff(jvms->endoff()+jvms_adj);
108 }
109 }
110
111 Node* PhaseMacroExpand::opt_bits_test(Node* ctrl, Node* region, int edge, Node* word, int mask, int bits, bool return_fast_path) {
112 Node* cmp;
113 if (mask != 0) {
114 Node* and_node = transform_later(new AndXNode(word, MakeConX(mask)));
115 cmp = transform_later(new CmpXNode(and_node, MakeConX(bits)));
116 } else {
117 cmp = word;
118 }
119 Node* bol = transform_later(new BoolNode(cmp, BoolTest::ne));
120 IfNode* iff = new IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN );
121 transform_later(iff);
122
123 // Fast path taken.
124 Node *fast_taken = transform_later(new IfFalseNode(iff));
125
126 // Fast path not-taken, i.e. slow path
127 Node *slow_taken = transform_later(new IfTrueNode(iff));
128
129 if (return_fast_path) {
130 region->init_req(edge, slow_taken); // Capture slow-control
131 return fast_taken;
132 } else {
133 region->init_req(edge, fast_taken); // Capture fast-control
134 return slow_taken;
135 }
136 }
137
138 //--------------------copy_predefined_input_for_runtime_call--------------------
139 void PhaseMacroExpand::copy_predefined_input_for_runtime_call(Node * ctrl, CallNode* oldcall, CallNode* call) {
140 // Set fixed predefined input arguments
141 call->init_req( TypeFunc::Control, ctrl );
142 call->init_req( TypeFunc::I_O , oldcall->in( TypeFunc::I_O) );
143 call->init_req( TypeFunc::Memory , oldcall->in( TypeFunc::Memory ) ); // ?????
144 call->init_req( TypeFunc::ReturnAdr, oldcall->in( TypeFunc::ReturnAdr ) );
145 call->init_req( TypeFunc::FramePtr, oldcall->in( TypeFunc::FramePtr ) );
146 }
147
148 //------------------------------make_slow_call---------------------------------
149 CallNode* PhaseMacroExpand::make_slow_call(CallNode *oldcall, const TypeFunc* slow_call_type,
150 address slow_call, const char* leaf_name, Node* slow_path,
151 Node* parm0, Node* parm1, Node* parm2) {
152
153 // Slow-path call
154 CallNode *call = leaf_name
155 ? (CallNode*)new CallLeafNode ( slow_call_type, slow_call, leaf_name, TypeRawPtr::BOTTOM )
156 : (CallNode*)new CallStaticJavaNode( slow_call_type, slow_call, OptoRuntime::stub_name(slow_call), oldcall->jvms()->bci(), TypeRawPtr::BOTTOM );
157
158 // Slow path call has no side-effects, uses few values
159 copy_predefined_input_for_runtime_call(slow_path, oldcall, call );
160 if (parm0 != NULL) call->init_req(TypeFunc::Parms+0, parm0);
161 if (parm1 != NULL) call->init_req(TypeFunc::Parms+1, parm1);
162 if (parm2 != NULL) call->init_req(TypeFunc::Parms+2, parm2);
163 copy_call_debug_info(oldcall, call);
164 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON.
165 _igvn.replace_node(oldcall, call);
166 transform_later(call);
167
168 return call;
169 }
170
171 void PhaseMacroExpand::extract_call_projections(CallNode *call) {
172 _fallthroughproj = NULL;
173 _fallthroughcatchproj = NULL;
174 _ioproj_fallthrough = NULL;
175 _ioproj_catchall = NULL;
176 _catchallcatchproj = NULL;
177 _memproj_fallthrough = NULL;
178 _memproj_catchall = NULL;
179 _resproj = NULL;
180 for (DUIterator_Fast imax, i = call->fast_outs(imax); i < imax; i++) {
181 ProjNode *pn = call->fast_out(i)->as_Proj();
182 switch (pn->_con) {
183 case TypeFunc::Control:
184 {
185 // For Control (fallthrough) and I_O (catch_all_index) we have CatchProj -> Catch -> Proj
186 _fallthroughproj = pn;
187 DUIterator_Fast jmax, j = pn->fast_outs(jmax);
188 const Node *cn = pn->fast_out(j);
189 if (cn->is_Catch()) {
190 ProjNode *cpn = NULL;
191 for (DUIterator_Fast kmax, k = cn->fast_outs(kmax); k < kmax; k++) {
192 cpn = cn->fast_out(k)->as_Proj();
193 assert(cpn->is_CatchProj(), "must be a CatchProjNode");
194 if (cpn->_con == CatchProjNode::fall_through_index)
195 _fallthroughcatchproj = cpn;
196 else {
197 assert(cpn->_con == CatchProjNode::catch_all_index, "must be correct index.");
198 _catchallcatchproj = cpn;
199 }
200 }
201 }
202 break;
203 }
204 case TypeFunc::I_O:
205 if (pn->_is_io_use)
206 _ioproj_catchall = pn;
207 else
208 _ioproj_fallthrough = pn;
209 break;
210 case TypeFunc::Memory:
211 if (pn->_is_io_use)
212 _memproj_catchall = pn;
213 else
214 _memproj_fallthrough = pn;
215 break;
216 case TypeFunc::Parms:
217 _resproj = pn;
218 break;
219 default:
220 assert(false, "unexpected projection from allocation node.");
221 }
222 }
223
224 }
225
226 // Eliminate a card mark sequence. p2x is a ConvP2XNode
227 void PhaseMacroExpand::eliminate_card_mark(Node* p2x) {
228 assert(p2x->Opcode() == Op_CastP2X, "ConvP2XNode required");
229 if (!UseG1GC) {
230 // vanilla/CMS post barrier
231 Node *shift = p2x->unique_out();
232 Node *addp = shift->unique_out();
233 for (DUIterator_Last jmin, j = addp->last_outs(jmin); j >= jmin; --j) {
234 Node *mem = addp->last_out(j);
235 if (UseCondCardMark && mem->is_Load()) {
236 assert(mem->Opcode() == Op_LoadB, "unexpected code shape");
237 // The load is checking if the card has been written so
238 // replace it with zero to fold the test.
239 _igvn.replace_node(mem, intcon(0));
240 continue;
241 }
242 assert(mem->is_Store(), "store required");
243 _igvn.replace_node(mem, mem->in(MemNode::Memory));
244 }
245 } else {
246 // G1 pre/post barriers
247 assert(p2x->outcnt() <= 2, "expects 1 or 2 users: Xor and URShift nodes");
248 // It could be only one user, URShift node, in Object.clone() intrinsic
249 // but the new allocation is passed to arraycopy stub and it could not
250 // be scalar replaced. So we don't check the case.
251
252 // An other case of only one user (Xor) is when the value check for NULL
253 // in G1 post barrier is folded after CCP so the code which used URShift
254 // is removed.
255
256 // Take Region node before eliminating post barrier since it also
257 // eliminates CastP2X node when it has only one user.
258 Node* this_region = p2x->in(0);
259 assert(this_region != NULL, "");
260
261 // Remove G1 post barrier.
262
263 // Search for CastP2X->Xor->URShift->Cmp path which
264 // checks if the store done to a different from the value's region.
265 // And replace Cmp with #0 (false) to collapse G1 post barrier.
266 Node* xorx = p2x->find_out_with(Op_XorX);
267 if (xorx != NULL) {
268 Node* shift = xorx->unique_out();
269 Node* cmpx = shift->unique_out();
270 assert(cmpx->is_Cmp() && cmpx->unique_out()->is_Bool() &&
271 cmpx->unique_out()->as_Bool()->_test._test == BoolTest::ne,
272 "missing region check in G1 post barrier");
273 _igvn.replace_node(cmpx, makecon(TypeInt::CC_EQ));
274
275 // Remove G1 pre barrier.
276
277 // Search "if (marking != 0)" check and set it to "false".
278 // There is no G1 pre barrier if previous stored value is NULL
279 // (for example, after initialization).
280 if (this_region->is_Region() && this_region->req() == 3) {
281 int ind = 1;
282 if (!this_region->in(ind)->is_IfFalse()) {
283 ind = 2;
284 }
285 if (this_region->in(ind)->is_IfFalse()) {
286 Node* bol = this_region->in(ind)->in(0)->in(1);
287 assert(bol->is_Bool(), "");
288 cmpx = bol->in(1);
289 if (bol->as_Bool()->_test._test == BoolTest::ne &&
290 cmpx->is_Cmp() && cmpx->in(2) == intcon(0) &&
291 cmpx->in(1)->is_Load()) {
292 Node* adr = cmpx->in(1)->as_Load()->in(MemNode::Address);
293 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() +
294 SATBMarkQueue::byte_offset_of_active());
295 if (adr->is_AddP() && adr->in(AddPNode::Base) == top() &&
296 adr->in(AddPNode::Address)->Opcode() == Op_ThreadLocal &&
297 adr->in(AddPNode::Offset) == MakeConX(marking_offset)) {
298 _igvn.replace_node(cmpx, makecon(TypeInt::CC_EQ));
299 }
300 }
301 }
302 }
303 } else {
304 assert(!GraphKit::use_ReduceInitialCardMarks(), "can only happen with card marking");
305 // This is a G1 post barrier emitted by the Object.clone() intrinsic.
306 // Search for the CastP2X->URShiftX->AddP->LoadB->Cmp path which checks if the card
307 // is marked as young_gen and replace the Cmp with 0 (false) to collapse the barrier.
308 Node* shift = p2x->find_out_with(Op_URShiftX);
309 assert(shift != NULL, "missing G1 post barrier");
310 Node* addp = shift->unique_out();
311 Node* load = addp->find_out_with(Op_LoadB);
312 assert(load != NULL, "missing G1 post barrier");
313 Node* cmpx = load->unique_out();
314 assert(cmpx->is_Cmp() && cmpx->unique_out()->is_Bool() &&
315 cmpx->unique_out()->as_Bool()->_test._test == BoolTest::ne,
316 "missing card value check in G1 post barrier");
317 _igvn.replace_node(cmpx, makecon(TypeInt::CC_EQ));
318 // There is no G1 pre barrier in this case
319 }
320 // Now CastP2X can be removed since it is used only on dead path
321 // which currently still alive until igvn optimize it.
322 assert(p2x->outcnt() == 0 || p2x->unique_out()->Opcode() == Op_URShiftX, "");
323 _igvn.replace_node(p2x, top());
324 }
325 }
326
327 // Search for a memory operation for the specified memory slice.
328 static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_mem, Node *alloc, PhaseGVN *phase) {
329 Node *orig_mem = mem;
330 Node *alloc_mem = alloc->in(TypeFunc::Memory);
331 const TypeOopPtr *tinst = phase->C->get_adr_type(alias_idx)->isa_oopptr();
332 while (true) {
333 if (mem == alloc_mem || mem == start_mem ) {
334 return mem; // hit one of our sentinels
335 } else if (mem->is_MergeMem()) {
336 mem = mem->as_MergeMem()->memory_at(alias_idx);
337 } else if (mem->is_Proj() && mem->as_Proj()->_con == TypeFunc::Memory) {
338 Node *in = mem->in(0);
339 // we can safely skip over safepoints, calls, locks and membars because we
340 // already know that the object is safe to eliminate.
341 if (in->is_Initialize() && in->as_Initialize()->allocation() == alloc) {
342 return in;
343 } else if (in->is_Call()) {
344 CallNode *call = in->as_Call();
345 if (call->may_modify(tinst, phase)) {
346 assert(call->is_ArrayCopy(), "ArrayCopy is the only call node that doesn't make allocation escape");
347 if (call->as_ArrayCopy()->modifies(offset, offset, phase, false)) {
348 return in;
349 }
350 }
351 mem = in->in(TypeFunc::Memory);
352 } else if (in->is_MemBar()) {
353 ArrayCopyNode* ac = NULL;
354 if (ArrayCopyNode::may_modify(tinst, in->as_MemBar(), phase, ac)) {
355 assert(ac != NULL && ac->is_clonebasic(), "Only basic clone is a non escaping clone");
356 return ac;
357 }
358 mem = in->in(TypeFunc::Memory);
359 } else {
360 assert(false, "unexpected projection");
361 }
362 } else if (mem->is_Store()) {
363 const TypePtr* atype = mem->as_Store()->adr_type();
364 int adr_idx = phase->C->get_alias_index(atype);
365 if (adr_idx == alias_idx) {
366 assert(atype->isa_oopptr(), "address type must be oopptr");
367 int adr_offset = atype->offset();
368 uint adr_iid = atype->is_oopptr()->instance_id();
369 // Array elements references have the same alias_idx
370 // but different offset and different instance_id.
371 if (adr_offset == offset && adr_iid == alloc->_idx)
372 return mem;
373 } else {
374 assert(adr_idx == Compile::AliasIdxRaw, "address must match or be raw");
375 }
376 mem = mem->in(MemNode::Memory);
377 } else if (mem->is_ClearArray()) {
378 if (!ClearArrayNode::step_through(&mem, alloc->_idx, phase)) {
379 // Can not bypass initialization of the instance
380 // we are looking.
381 debug_only(intptr_t offset;)
382 assert(alloc == AllocateNode::Ideal_allocation(mem->in(3), phase, offset), "sanity");
383 InitializeNode* init = alloc->as_Allocate()->initialization();
384 // We are looking for stored value, return Initialize node
385 // or memory edge from Allocate node.
386 if (init != NULL)
387 return init;
388 else
389 return alloc->in(TypeFunc::Memory); // It will produce zero value (see callers).
390 }
391 // Otherwise skip it (the call updated 'mem' value).
392 } else if (mem->Opcode() == Op_SCMemProj) {
393 mem = mem->in(0);
394 Node* adr = NULL;
395 if (mem->is_LoadStore()) {
396 adr = mem->in(MemNode::Address);
397 } else {
398 assert(mem->Opcode() == Op_EncodeISOArray ||
399 mem->Opcode() == Op_StrCompressedCopy, "sanity");
400 adr = mem->in(3); // Destination array
401 }
402 const TypePtr* atype = adr->bottom_type()->is_ptr();
403 int adr_idx = phase->C->get_alias_index(atype);
404 if (adr_idx == alias_idx) {
405 DEBUG_ONLY(mem->dump();)
406 assert(false, "Object is not scalar replaceable if a LoadStore node accesses its field");
407 return NULL;
408 }
409 mem = mem->in(MemNode::Memory);
410 } else if (mem->Opcode() == Op_StrInflatedCopy) {
411 Node* adr = mem->in(3); // Destination array
412 const TypePtr* atype = adr->bottom_type()->is_ptr();
413 int adr_idx = phase->C->get_alias_index(atype);
414 if (adr_idx == alias_idx) {
415 DEBUG_ONLY(mem->dump();)
416 assert(false, "Object is not scalar replaceable if a StrInflatedCopy node accesses its field");
417 return NULL;
418 }
419 mem = mem->in(MemNode::Memory);
420 } else {
421 return mem;
422 }
423 assert(mem != orig_mem, "dead memory loop");
424 }
425 }
426
427 // Generate loads from source of the arraycopy for fields of
428 // destination needed at a deoptimization point
429 Node* PhaseMacroExpand::make_arraycopy_load(ArrayCopyNode* ac, intptr_t offset, Node* ctl, Node* mem, BasicType ft, const Type *ftype, AllocateNode *alloc) {
430 BasicType bt = ft;
431 const Type *type = ftype;
432 if (ft == T_NARROWOOP) {
433 bt = T_OBJECT;
434 type = ftype->make_oopptr();
435 }
436 Node* res = NULL;
437 if (ac->is_clonebasic()) {
438 Node* base = ac->in(ArrayCopyNode::Src)->in(AddPNode::Base);
439 Node* adr = _igvn.transform(new AddPNode(base, base, MakeConX(offset)));
440 const TypePtr* adr_type = _igvn.type(base)->is_ptr()->add_offset(offset);
441 res = LoadNode::make(_igvn, ctl, mem, adr, adr_type, type, bt, MemNode::unordered, LoadNode::Pinned);
442 } else {
443 if (ac->modifies(offset, offset, &_igvn, true)) {
444 assert(ac->in(ArrayCopyNode::Dest) == alloc->result_cast(), "arraycopy destination should be allocation's result");
445 uint shift = exact_log2(type2aelembytes(bt));
446 Node* diff = _igvn.transform(new SubINode(ac->in(ArrayCopyNode::SrcPos), ac->in(ArrayCopyNode::DestPos)));
447 #ifdef _LP64
448 diff = _igvn.transform(new ConvI2LNode(diff));
449 #endif
450 diff = _igvn.transform(new LShiftXNode(diff, intcon(shift)));
451
452 Node* off = _igvn.transform(new AddXNode(MakeConX(offset), diff));
453 Node* base = ac->in(ArrayCopyNode::Src);
454 Node* adr = _igvn.transform(new AddPNode(base, base, off));
455 const TypePtr* adr_type = _igvn.type(base)->is_ptr()->add_offset(offset);
456 res = LoadNode::make(_igvn, ctl, mem, adr, adr_type, type, bt, MemNode::unordered, LoadNode::Pinned);
457 }
458 }
459 if (res != NULL) {
460 res = _igvn.transform(res);
461 if (ftype->isa_narrowoop()) {
462 // PhaseMacroExpand::scalar_replacement adds DecodeN nodes
463 res = _igvn.transform(new EncodePNode(res, ftype));
464 }
465 return res;
466 }
467 return NULL;
468 }
469
470 //
471 // Given a Memory Phi, compute a value Phi containing the values from stores
472 // on the input paths.
473 // Note: this function is recursive, its depth is limited by the "level" argument
474 // Returns the computed Phi, or NULL if it cannot compute it.
475 Node *PhaseMacroExpand::value_from_mem_phi(Node *mem, BasicType ft, const Type *phi_type, const TypeOopPtr *adr_t, AllocateNode *alloc, Node_Stack *value_phis, int level) {
476 assert(mem->is_Phi(), "sanity");
477 int alias_idx = C->get_alias_index(adr_t);
478 int offset = adr_t->offset();
479 int instance_id = adr_t->instance_id();
480
481 // Check if an appropriate value phi already exists.
482 Node* region = mem->in(0);
483 for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) {
484 Node* phi = region->fast_out(k);
485 if (phi->is_Phi() && phi != mem &&
486 phi->as_Phi()->is_same_inst_field(phi_type, (int)mem->_idx, instance_id, alias_idx, offset)) {
487 return phi;
488 }
489 }
490 // Check if an appropriate new value phi already exists.
491 Node* new_phi = value_phis->find(mem->_idx);
492 if (new_phi != NULL)
493 return new_phi;
494
495 if (level <= 0) {
496 return NULL; // Give up: phi tree too deep
497 }
498 Node *start_mem = C->start()->proj_out(TypeFunc::Memory);
499 Node *alloc_mem = alloc->in(TypeFunc::Memory);
500
501 uint length = mem->req();
502 GrowableArray <Node *> values(length, length, NULL, false);
503
504 // create a new Phi for the value
505 PhiNode *phi = new PhiNode(mem->in(0), phi_type, NULL, mem->_idx, instance_id, alias_idx, offset);
506 transform_later(phi);
507 value_phis->push(phi, mem->_idx);
508
509 for (uint j = 1; j < length; j++) {
510 Node *in = mem->in(j);
511 if (in == NULL || in->is_top()) {
512 values.at_put(j, in);
513 } else {
514 Node *val = scan_mem_chain(in, alias_idx, offset, start_mem, alloc, &_igvn);
515 if (val == start_mem || val == alloc_mem) {
516 // hit a sentinel, return appropriate 0 value
517 values.at_put(j, _igvn.zerocon(ft));
518 continue;
519 }
520 if (val->is_Initialize()) {
521 val = val->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
522 }
523 if (val == NULL) {
524 return NULL; // can't find a value on this path
525 }
526 if (val == mem) {
527 values.at_put(j, mem);
528 } else if (val->is_Store()) {
529 values.at_put(j, val->in(MemNode::ValueIn));
530 } else if(val->is_Proj() && val->in(0) == alloc) {
531 values.at_put(j, _igvn.zerocon(ft));
532 } else if (val->is_Phi()) {
533 val = value_from_mem_phi(val, ft, phi_type, adr_t, alloc, value_phis, level-1);
534 if (val == NULL) {
535 return NULL;
536 }
537 values.at_put(j, val);
538 } else if (val->Opcode() == Op_SCMemProj) {
539 assert(val->in(0)->is_LoadStore() ||
540 val->in(0)->Opcode() == Op_EncodeISOArray ||
541 val->in(0)->Opcode() == Op_StrCompressedCopy, "sanity");
542 assert(false, "Object is not scalar replaceable if a LoadStore node accesses its field");
543 return NULL;
544 } else if (val->is_ArrayCopy()) {
545 Node* res = make_arraycopy_load(val->as_ArrayCopy(), offset, val->in(0), val->in(TypeFunc::Memory), ft, phi_type, alloc);
546 if (res == NULL) {
547 return NULL;
548 }
549 values.at_put(j, res);
550 } else {
551 #ifdef ASSERT
552 val->dump();
553 assert(false, "unknown node on this path");
554 #endif
555 return NULL; // unknown node on this path
556 }
557 }
558 }
559 // Set Phi's inputs
560 for (uint j = 1; j < length; j++) {
561 if (values.at(j) == mem) {
562 phi->init_req(j, phi);
563 } else {
564 phi->init_req(j, values.at(j));
565 }
566 }
567 return phi;
568 }
569
570 // Search the last value stored into the object's field.
571 Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, Node *sfpt_ctl, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, AllocateNode *alloc) {
572 assert(adr_t->is_known_instance_field(), "instance required");
573 int instance_id = adr_t->instance_id();
574 assert((uint)instance_id == alloc->_idx, "wrong allocation");
575
576 int alias_idx = C->get_alias_index(adr_t);
577 int offset = adr_t->offset();
578 Node *start_mem = C->start()->proj_out(TypeFunc::Memory);
579 Node *alloc_ctrl = alloc->in(TypeFunc::Control);
580 Node *alloc_mem = alloc->in(TypeFunc::Memory);
581 Arena *a = Thread::current()->resource_area();
582 VectorSet visited(a);
583
584
585 bool done = sfpt_mem == alloc_mem;
586 Node *mem = sfpt_mem;
587 while (!done) {
588 if (visited.test_set(mem->_idx)) {
589 return NULL; // found a loop, give up
590 }
591 mem = scan_mem_chain(mem, alias_idx, offset, start_mem, alloc, &_igvn);
592 if (mem == start_mem || mem == alloc_mem) {
593 done = true; // hit a sentinel, return appropriate 0 value
594 } else if (mem->is_Initialize()) {
595 mem = mem->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
596 if (mem == NULL) {
597 done = true; // Something go wrong.
598 } else if (mem->is_Store()) {
599 const TypePtr* atype = mem->as_Store()->adr_type();
600 assert(C->get_alias_index(atype) == Compile::AliasIdxRaw, "store is correct memory slice");
601 done = true;
602 }
603 } else if (mem->is_Store()) {
604 const TypeOopPtr* atype = mem->as_Store()->adr_type()->isa_oopptr();
605 assert(atype != NULL, "address type must be oopptr");
606 assert(C->get_alias_index(atype) == alias_idx &&
607 atype->is_known_instance_field() && atype->offset() == offset &&
608 atype->instance_id() == instance_id, "store is correct memory slice");
609 done = true;
610 } else if (mem->is_Phi()) {
611 // try to find a phi's unique input
612 Node *unique_input = NULL;
613 Node *top = C->top();
614 for (uint i = 1; i < mem->req(); i++) {
615 Node *n = scan_mem_chain(mem->in(i), alias_idx, offset, start_mem, alloc, &_igvn);
616 if (n == NULL || n == top || n == mem) {
617 continue;
618 } else if (unique_input == NULL) {
619 unique_input = n;
620 } else if (unique_input != n) {
621 unique_input = top;
622 break;
623 }
624 }
625 if (unique_input != NULL && unique_input != top) {
626 mem = unique_input;
627 } else {
628 done = true;
629 }
630 } else if (mem->is_ArrayCopy()) {
631 done = true;
632 } else {
633 assert(false, "unexpected node");
634 }
635 }
636 if (mem != NULL) {
637 if (mem == start_mem || mem == alloc_mem) {
638 // hit a sentinel, return appropriate 0 value
639 return _igvn.zerocon(ft);
640 } else if (mem->is_Store()) {
641 return mem->in(MemNode::ValueIn);
642 } else if (mem->is_Phi()) {
643 // attempt to produce a Phi reflecting the values on the input paths of the Phi
644 Node_Stack value_phis(a, 8);
645 Node * phi = value_from_mem_phi(mem, ft, ftype, adr_t, alloc, &value_phis, ValueSearchLimit);
646 if (phi != NULL) {
647 return phi;
648 } else {
649 // Kill all new Phis
650 while(value_phis.is_nonempty()) {
651 Node* n = value_phis.node();
652 _igvn.replace_node(n, C->top());
653 value_phis.pop();
654 }
655 }
656 } else if (mem->is_ArrayCopy()) {
657 Node* ctl = mem->in(0);
658 Node* m = mem->in(TypeFunc::Memory);
659 if (sfpt_ctl->is_Proj() && sfpt_ctl->as_Proj()->is_uncommon_trap_proj(Deoptimization::Reason_none)) {
660 // pin the loads in the uncommon trap path
661 ctl = sfpt_ctl;
662 m = sfpt_mem;
663 }
664 return make_arraycopy_load(mem->as_ArrayCopy(), offset, ctl, m, ft, ftype, alloc);
665 }
666 }
667 // Something go wrong.
668 return NULL;
669 }
670
671 // Check the possibility of scalar replacement.
672 bool PhaseMacroExpand::can_eliminate_allocation(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) {
673 // Scan the uses of the allocation to check for anything that would
674 // prevent us from eliminating it.
675 NOT_PRODUCT( const char* fail_eliminate = NULL; )
676 DEBUG_ONLY( Node* disq_node = NULL; )
677 bool can_eliminate = true;
678
679 Node* res = alloc->result_cast();
680 const TypeOopPtr* res_type = NULL;
681 if (res == NULL) {
682 // All users were eliminated.
683 } else if (!res->is_CheckCastPP()) {
684 NOT_PRODUCT(fail_eliminate = "Allocation does not have unique CheckCastPP";)
685 can_eliminate = false;
686 } else {
687 res_type = _igvn.type(res)->isa_oopptr();
688 if (res_type == NULL) {
689 NOT_PRODUCT(fail_eliminate = "Neither instance or array allocation";)
690 can_eliminate = false;
691 } else if (res_type->isa_aryptr()) {
692 int length = alloc->in(AllocateNode::ALength)->find_int_con(-1);
693 if (length < 0) {
694 NOT_PRODUCT(fail_eliminate = "Array's size is not constant";)
695 can_eliminate = false;
696 }
697 }
698 }
699
700 if (can_eliminate && res != NULL) {
701 for (DUIterator_Fast jmax, j = res->fast_outs(jmax);
702 j < jmax && can_eliminate; j++) {
703 Node* use = res->fast_out(j);
704
705 if (use->is_AddP()) {
706 const TypePtr* addp_type = _igvn.type(use)->is_ptr();
707 int offset = addp_type->offset();
708
709 if (offset == Type::OffsetTop || offset == Type::OffsetBot) {
710 NOT_PRODUCT(fail_eliminate = "Undefined field referrence";)
711 can_eliminate = false;
712 break;
713 }
714 for (DUIterator_Fast kmax, k = use->fast_outs(kmax);
715 k < kmax && can_eliminate; k++) {
716 Node* n = use->fast_out(k);
717 if (!n->is_Store() && n->Opcode() != Op_CastP2X &&
718 !(n->is_ArrayCopy() &&
719 n->as_ArrayCopy()->is_clonebasic() &&
720 n->in(ArrayCopyNode::Dest) == use)) {
721 DEBUG_ONLY(disq_node = n;)
722 if (n->is_Load() || n->is_LoadStore()) {
723 NOT_PRODUCT(fail_eliminate = "Field load";)
724 } else {
725 NOT_PRODUCT(fail_eliminate = "Not store field referrence";)
726 }
727 can_eliminate = false;
728 }
729 }
730 } else if (use->is_ArrayCopy() &&
731 (use->as_ArrayCopy()->is_arraycopy_validated() ||
732 use->as_ArrayCopy()->is_copyof_validated() ||
733 use->as_ArrayCopy()->is_copyofrange_validated()) &&
734 use->in(ArrayCopyNode::Dest) == res) {
735 // ok to eliminate
736 } else if (use->is_SafePoint()) {
737 SafePointNode* sfpt = use->as_SafePoint();
738 if (sfpt->is_Call() && sfpt->as_Call()->has_non_debug_use(res)) {
739 // Object is passed as argument.
740 DEBUG_ONLY(disq_node = use;)
741 NOT_PRODUCT(fail_eliminate = "Object is passed as argument";)
742 can_eliminate = false;
743 }
744 Node* sfptMem = sfpt->memory();
745 if (sfptMem == NULL || sfptMem->is_top()) {
746 DEBUG_ONLY(disq_node = use;)
747 NOT_PRODUCT(fail_eliminate = "NULL or TOP memory";)
748 can_eliminate = false;
749 } else {
750 safepoints.append_if_missing(sfpt);
751 }
752 } else if (use->Opcode() != Op_CastP2X) { // CastP2X is used by card mark
753 if (use->is_Phi()) {
754 if (use->outcnt() == 1 && use->unique_out()->Opcode() == Op_Return) {
755 NOT_PRODUCT(fail_eliminate = "Object is return value";)
756 } else {
757 NOT_PRODUCT(fail_eliminate = "Object is referenced by Phi";)
758 }
759 DEBUG_ONLY(disq_node = use;)
760 } else {
761 if (use->Opcode() == Op_Return) {
762 NOT_PRODUCT(fail_eliminate = "Object is return value";)
763 }else {
764 NOT_PRODUCT(fail_eliminate = "Object is referenced by node";)
765 }
766 DEBUG_ONLY(disq_node = use;)
767 }
768 can_eliminate = false;
769 }
770 }
771 }
772
773 #ifndef PRODUCT
774 if (PrintEliminateAllocations) {
775 if (can_eliminate) {
776 tty->print("Scalar ");
777 if (res == NULL)
778 alloc->dump();
779 else
780 res->dump();
781 } else if (alloc->_is_scalar_replaceable) {
782 tty->print("NotScalar (%s)", fail_eliminate);
783 if (res == NULL)
784 alloc->dump();
785 else
786 res->dump();
787 #ifdef ASSERT
788 if (disq_node != NULL) {
789 tty->print(" >>>> ");
790 disq_node->dump();
791 }
792 #endif /*ASSERT*/
793 }
794 }
795 #endif
796 return can_eliminate;
797 }
798
799 // Do scalar replacement.
800 bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) {
801 GrowableArray <SafePointNode *> safepoints_done;
802
803 ciKlass* klass = NULL;
804 ciInstanceKlass* iklass = NULL;
805 int nfields = 0;
806 int array_base = 0;
807 int element_size = 0;
808 BasicType basic_elem_type = T_ILLEGAL;
809 ciType* elem_type = NULL;
810
811 Node* res = alloc->result_cast();
812 assert(res == NULL || res->is_CheckCastPP(), "unexpected AllocateNode result");
813 const TypeOopPtr* res_type = NULL;
814 if (res != NULL) { // Could be NULL when there are no users
815 res_type = _igvn.type(res)->isa_oopptr();
816 }
817
818 if (res != NULL) {
819 klass = res_type->klass();
820 if (res_type->isa_instptr()) {
821 // find the fields of the class which will be needed for safepoint debug information
822 assert(klass->is_instance_klass(), "must be an instance klass.");
823 iklass = klass->as_instance_klass();
824 nfields = iklass->nof_nonstatic_fields();
825 } else {
826 // find the array's elements which will be needed for safepoint debug information
827 nfields = alloc->in(AllocateNode::ALength)->find_int_con(-1);
828 assert(klass->is_array_klass() && nfields >= 0, "must be an array klass.");
829 elem_type = klass->as_array_klass()->element_type();
830 basic_elem_type = elem_type->basic_type();
831 array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type);
832 element_size = type2aelembytes(basic_elem_type);
833 }
834 }
835 //
836 // Process the safepoint uses
837 //
838 while (safepoints.length() > 0) {
839 SafePointNode* sfpt = safepoints.pop();
840 Node* mem = sfpt->memory();
841 Node* ctl = sfpt->control();
842 assert(sfpt->jvms() != NULL, "missed JVMS");
843 // Fields of scalar objs are referenced only at the end
844 // of regular debuginfo at the last (youngest) JVMS.
845 // Record relative start index.
846 uint first_ind = (sfpt->req() - sfpt->jvms()->scloff());
847 SafePointScalarObjectNode* sobj = new SafePointScalarObjectNode(res_type,
848 #ifdef ASSERT
849 alloc,
850 #endif
851 first_ind, nfields);
852 sobj->init_req(0, C->root());
853 transform_later(sobj);
854
855 // Scan object's fields adding an input to the safepoint for each field.
856 for (int j = 0; j < nfields; j++) {
857 intptr_t offset;
858 ciField* field = NULL;
859 if (iklass != NULL) {
860 field = iklass->nonstatic_field_at(j);
861 offset = field->offset();
862 elem_type = field->type();
863 basic_elem_type = field->layout_type();
864 } else {
865 offset = array_base + j * (intptr_t)element_size;
866 }
867
868 const Type *field_type;
869 // The next code is taken from Parse::do_get_xxx().
870 if (basic_elem_type == T_OBJECT || basic_elem_type == T_ARRAY) {
871 if (!elem_type->is_loaded()) {
872 field_type = TypeInstPtr::BOTTOM;
873 } else if (field != NULL && field->is_static_constant()) {
874 // This can happen if the constant oop is non-perm.
875 ciObject* con = field->constant_value().as_object();
876 // Do not "join" in the previous type; it doesn't add value,
877 // and may yield a vacuous result if the field is of interface type.
878 field_type = TypeOopPtr::make_from_constant(con)->isa_oopptr();
879 assert(field_type != NULL, "field singleton type must be consistent");
880 } else {
881 field_type = TypeOopPtr::make_from_klass(elem_type->as_klass());
882 }
883 if (UseCompressedOops) {
884 field_type = field_type->make_narrowoop();
885 basic_elem_type = T_NARROWOOP;
886 }
887 } else {
888 field_type = Type::get_const_basic_type(basic_elem_type);
889 }
890
891 const TypeOopPtr *field_addr_type = res_type->add_offset(offset)->isa_oopptr();
892
893 Node *field_val = value_from_mem(mem, ctl, basic_elem_type, field_type, field_addr_type, alloc);
894 if (field_val == NULL) {
895 // We weren't able to find a value for this field,
896 // give up on eliminating this allocation.
897
898 // Remove any extra entries we added to the safepoint.
899 uint last = sfpt->req() - 1;
900 for (int k = 0; k < j; k++) {
901 sfpt->del_req(last--);
902 }
903 _igvn._worklist.push(sfpt);
904 // rollback processed safepoints
905 while (safepoints_done.length() > 0) {
906 SafePointNode* sfpt_done = safepoints_done.pop();
907 // remove any extra entries we added to the safepoint
908 last = sfpt_done->req() - 1;
909 for (int k = 0; k < nfields; k++) {
910 sfpt_done->del_req(last--);
911 }
912 JVMState *jvms = sfpt_done->jvms();
913 jvms->set_endoff(sfpt_done->req());
914 // Now make a pass over the debug information replacing any references
915 // to SafePointScalarObjectNode with the allocated object.
916 int start = jvms->debug_start();
917 int end = jvms->debug_end();
918 for (int i = start; i < end; i++) {
919 if (sfpt_done->in(i)->is_SafePointScalarObject()) {
920 SafePointScalarObjectNode* scobj = sfpt_done->in(i)->as_SafePointScalarObject();
921 if (scobj->first_index(jvms) == sfpt_done->req() &&
922 scobj->n_fields() == (uint)nfields) {
923 assert(scobj->alloc() == alloc, "sanity");
924 sfpt_done->set_req(i, res);
925 }
926 }
927 }
928 _igvn._worklist.push(sfpt_done);
929 }
930 #ifndef PRODUCT
931 if (PrintEliminateAllocations) {
932 if (field != NULL) {
933 tty->print("=== At SafePoint node %d can't find value of Field: ",
934 sfpt->_idx);
935 field->print();
936 int field_idx = C->get_alias_index(field_addr_type);
937 tty->print(" (alias_idx=%d)", field_idx);
938 } else { // Array's element
939 tty->print("=== At SafePoint node %d can't find value of array element [%d]",
940 sfpt->_idx, j);
941 }
942 tty->print(", which prevents elimination of: ");
943 if (res == NULL)
944 alloc->dump();
945 else
946 res->dump();
947 }
948 #endif
949 return false;
950 }
951 if (UseCompressedOops && field_type->isa_narrowoop()) {
952 // Enable "DecodeN(EncodeP(Allocate)) --> Allocate" transformation
953 // to be able scalar replace the allocation.
954 if (field_val->is_EncodeP()) {
955 field_val = field_val->in(1);
956 } else {
957 field_val = transform_later(new DecodeNNode(field_val, field_val->get_ptr_type()));
958 }
959 }
960 sfpt->add_req(field_val);
961 }
962 JVMState *jvms = sfpt->jvms();
963 jvms->set_endoff(sfpt->req());
964 // Now make a pass over the debug information replacing any references
965 // to the allocated object with "sobj"
966 int start = jvms->debug_start();
967 int end = jvms->debug_end();
968 sfpt->replace_edges_in_range(res, sobj, start, end);
969 _igvn._worklist.push(sfpt);
970 safepoints_done.append_if_missing(sfpt); // keep it for rollback
971 }
972 return true;
973 }
974
975 static void disconnect_projections(MultiNode* n, PhaseIterGVN& igvn) {
976 Node* ctl_proj = n->proj_out(TypeFunc::Control);
977 Node* mem_proj = n->proj_out(TypeFunc::Memory);
978 if (ctl_proj != NULL) {
979 igvn.replace_node(ctl_proj, n->in(0));
980 }
981 if (mem_proj != NULL) {
982 igvn.replace_node(mem_proj, n->in(TypeFunc::Memory));
983 }
984 }
985
986 // Process users of eliminated allocation.
987 void PhaseMacroExpand::process_users_of_allocation(CallNode *alloc) {
988 Node* res = alloc->result_cast();
989 if (res != NULL) {
990 for (DUIterator_Last jmin, j = res->last_outs(jmin); j >= jmin; ) {
991 Node *use = res->last_out(j);
992 uint oc1 = res->outcnt();
993
994 if (use->is_AddP()) {
995 for (DUIterator_Last kmin, k = use->last_outs(kmin); k >= kmin; ) {
996 Node *n = use->last_out(k);
997 uint oc2 = use->outcnt();
998 if (n->is_Store()) {
999 #ifdef ASSERT
1000 // Verify that there is no dependent MemBarVolatile nodes,
1001 // they should be removed during IGVN, see MemBarNode::Ideal().
1002 for (DUIterator_Fast pmax, p = n->fast_outs(pmax);
1003 p < pmax; p++) {
1004 Node* mb = n->fast_out(p);
1005 assert(mb->is_Initialize() || !mb->is_MemBar() ||
1006 mb->req() <= MemBarNode::Precedent ||
1007 mb->in(MemBarNode::Precedent) != n,
1008 "MemBarVolatile should be eliminated for non-escaping object");
1009 }
1010 #endif
1011 _igvn.replace_node(n, n->in(MemNode::Memory));
1012 } else if (n->is_ArrayCopy()) {
1013 // Disconnect ArrayCopy node
1014 ArrayCopyNode* ac = n->as_ArrayCopy();
1015 assert(ac->is_clonebasic(), "unexpected array copy kind");
1016 Node* membar_after = ac->proj_out(TypeFunc::Control)->unique_ctrl_out();
1017 disconnect_projections(ac, _igvn);
1018 assert(alloc->in(0)->is_Proj() && alloc->in(0)->in(0)->Opcode() == Op_MemBarCPUOrder, "mem barrier expected before allocation");
1019 Node* membar_before = alloc->in(0)->in(0);
1020 disconnect_projections(membar_before->as_MemBar(), _igvn);
1021 if (membar_after->is_MemBar()) {
1022 disconnect_projections(membar_after->as_MemBar(), _igvn);
1023 }
1024 } else {
1025 eliminate_card_mark(n);
1026 }
1027 k -= (oc2 - use->outcnt());
1028 }
1029 } else if (use->is_ArrayCopy()) {
1030 // Disconnect ArrayCopy node
1031 ArrayCopyNode* ac = use->as_ArrayCopy();
1032 assert(ac->is_arraycopy_validated() ||
1033 ac->is_copyof_validated() ||
1034 ac->is_copyofrange_validated(), "unsupported");
1035 CallProjections callprojs;
1036 ac->extract_projections(&callprojs, true);
1037
1038 _igvn.replace_node(callprojs.fallthrough_ioproj, ac->in(TypeFunc::I_O));
1039 _igvn.replace_node(callprojs.fallthrough_memproj, ac->in(TypeFunc::Memory));
1040 _igvn.replace_node(callprojs.fallthrough_catchproj, ac->in(TypeFunc::Control));
1041
1042 // Set control to top. IGVN will remove the remaining projections
1043 ac->set_req(0, top());
1044 ac->replace_edge(res, top());
1045
1046 // Disconnect src right away: it can help find new
1047 // opportunities for allocation elimination
1048 Node* src = ac->in(ArrayCopyNode::Src);
1049 ac->replace_edge(src, top());
1050 // src can be top at this point if src and dest of the
1051 // arraycopy were the same
1052 if (src->outcnt() == 0 && !src->is_top()) {
1053 _igvn.remove_dead_node(src);
1054 }
1055
1056 _igvn._worklist.push(ac);
1057 } else {
1058 eliminate_card_mark(use);
1059 }
1060 j -= (oc1 - res->outcnt());
1061 }
1062 assert(res->outcnt() == 0, "all uses of allocated objects must be deleted");
1063 _igvn.remove_dead_node(res);
1064 }
1065
1066 //
1067 // Process other users of allocation's projections
1068 //
1069 if (_resproj != NULL && _resproj->outcnt() != 0) {
1070 // First disconnect stores captured by Initialize node.
1071 // If Initialize node is eliminated first in the following code,
1072 // it will kill such stores and DUIterator_Last will assert.
1073 for (DUIterator_Fast jmax, j = _resproj->fast_outs(jmax); j < jmax; j++) {
1074 Node *use = _resproj->fast_out(j);
1075 if (use->is_AddP()) {
1076 // raw memory addresses used only by the initialization
1077 _igvn.replace_node(use, C->top());
1078 --j; --jmax;
1079 }
1080 }
1081 for (DUIterator_Last jmin, j = _resproj->last_outs(jmin); j >= jmin; ) {
1082 Node *use = _resproj->last_out(j);
1083 uint oc1 = _resproj->outcnt();
1084 if (use->is_Initialize()) {
1085 // Eliminate Initialize node.
1086 InitializeNode *init = use->as_Initialize();
1087 assert(init->outcnt() <= 2, "only a control and memory projection expected");
1088 Node *ctrl_proj = init->proj_out(TypeFunc::Control);
1089 if (ctrl_proj != NULL) {
1090 assert(init->in(TypeFunc::Control) == _fallthroughcatchproj, "allocation control projection");
1091 _igvn.replace_node(ctrl_proj, _fallthroughcatchproj);
1092 }
1093 Node *mem_proj = init->proj_out(TypeFunc::Memory);
1094 if (mem_proj != NULL) {
1095 Node *mem = init->in(TypeFunc::Memory);
1096 #ifdef ASSERT
1097 if (mem->is_MergeMem()) {
1098 assert(mem->in(TypeFunc::Memory) == _memproj_fallthrough, "allocation memory projection");
1099 } else {
1100 assert(mem == _memproj_fallthrough, "allocation memory projection");
1101 }
1102 #endif
1103 _igvn.replace_node(mem_proj, mem);
1104 }
1105 } else {
1106 assert(false, "only Initialize or AddP expected");
1107 }
1108 j -= (oc1 - _resproj->outcnt());
1109 }
1110 }
1111 if (_fallthroughcatchproj != NULL) {
1112 _igvn.replace_node(_fallthroughcatchproj, alloc->in(TypeFunc::Control));
1113 }
1114 if (_memproj_fallthrough != NULL) {
1115 _igvn.replace_node(_memproj_fallthrough, alloc->in(TypeFunc::Memory));
1116 }
1117 if (_memproj_catchall != NULL) {
1118 _igvn.replace_node(_memproj_catchall, C->top());
1119 }
1120 if (_ioproj_fallthrough != NULL) {
1121 _igvn.replace_node(_ioproj_fallthrough, alloc->in(TypeFunc::I_O));
1122 }
1123 if (_ioproj_catchall != NULL) {
1124 _igvn.replace_node(_ioproj_catchall, C->top());
1125 }
1126 if (_catchallcatchproj != NULL) {
1127 _igvn.replace_node(_catchallcatchproj, C->top());
1128 }
1129 }
1130
1131 bool PhaseMacroExpand::eliminate_allocate_node(AllocateNode *alloc) {
1132 // Don't do scalar replacement if the frame can be popped by JVMTI:
1133 // if reallocation fails during deoptimization we'll pop all
1134 // interpreter frames for this compiled frame and that won't play
1135 // nice with JVMTI popframe.
1136 if (!EliminateAllocations || JvmtiExport::can_pop_frame() || !alloc->_is_non_escaping) {
1137 return false;
1138 }
1139 Node* klass = alloc->in(AllocateNode::KlassNode);
1140 const TypeKlassPtr* tklass = _igvn.type(klass)->is_klassptr();
1141 Node* res = alloc->result_cast();
1142 // Eliminate boxing allocations which are not used
1143 // regardless scalar replacable status.
1144 bool boxing_alloc = C->eliminate_boxing() &&
1145 tklass->klass()->is_instance_klass() &&
1146 tklass->klass()->as_instance_klass()->is_box_klass();
1147 if (!alloc->_is_scalar_replaceable && (!boxing_alloc || (res != NULL))) {
1148 return false;
1149 }
1150
1151 extract_call_projections(alloc);
1152
1153 GrowableArray <SafePointNode *> safepoints;
1154 if (!can_eliminate_allocation(alloc, safepoints)) {
1155 return false;
1156 }
1157
1158 if (!alloc->_is_scalar_replaceable) {
1159 assert(res == NULL, "sanity");
1160 // We can only eliminate allocation if all debug info references
1161 // are already replaced with SafePointScalarObject because
1162 // we can't search for a fields value without instance_id.
1163 if (safepoints.length() > 0) {
1164 return false;
1165 }
1166 }
1167
1168 if (!scalar_replacement(alloc, safepoints)) {
1169 return false;
1170 }
1171
1172 CompileLog* log = C->log();
1173 if (log != NULL) {
1174 log->head("eliminate_allocation type='%d'",
1175 log->identify(tklass->klass()));
1176 JVMState* p = alloc->jvms();
1177 while (p != NULL) {
1178 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1179 p = p->caller();
1180 }
1181 log->tail("eliminate_allocation");
1182 }
1183
1184 process_users_of_allocation(alloc);
1185
1186 #ifndef PRODUCT
1187 if (PrintEliminateAllocations) {
1188 if (alloc->is_AllocateArray())
1189 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx);
1190 else
1191 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx);
1192 }
1193 #endif
1194
1195 return true;
1196 }
1197
1198 bool PhaseMacroExpand::eliminate_boxing_node(CallStaticJavaNode *boxing) {
1199 // EA should remove all uses of non-escaping boxing node.
1200 if (!C->eliminate_boxing() || boxing->proj_out(TypeFunc::Parms) != NULL) {
1201 return false;
1202 }
1203
1204 assert(boxing->result_cast() == NULL, "unexpected boxing node result");
1205
1206 extract_call_projections(boxing);
1207
1208 const TypeTuple* r = boxing->tf()->range();
1209 assert(r->cnt() > TypeFunc::Parms, "sanity");
1210 const TypeInstPtr* t = r->field_at(TypeFunc::Parms)->isa_instptr();
1211 assert(t != NULL, "sanity");
1212
1213 CompileLog* log = C->log();
1214 if (log != NULL) {
1215 log->head("eliminate_boxing type='%d'",
1216 log->identify(t->klass()));
1217 JVMState* p = boxing->jvms();
1218 while (p != NULL) {
1219 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1220 p = p->caller();
1221 }
1222 log->tail("eliminate_boxing");
1223 }
1224
1225 process_users_of_allocation(boxing);
1226
1227 #ifndef PRODUCT
1228 if (PrintEliminateAllocations) {
1229 tty->print("++++ Eliminated: %d ", boxing->_idx);
1230 boxing->method()->print_short_name(tty);
1231 tty->cr();
1232 }
1233 #endif
1234
1235 return true;
1236 }
1237
1238 //---------------------------set_eden_pointers-------------------------
1239 void PhaseMacroExpand::set_eden_pointers(Node* &eden_top_adr, Node* &eden_end_adr) {
1240 if (UseTLAB) { // Private allocation: load from TLS
1241 Node* thread = transform_later(new ThreadLocalNode());
1242 int tlab_top_offset = in_bytes(JavaThread::tlab_top_offset());
1243 int tlab_end_offset = in_bytes(JavaThread::tlab_end_offset());
1244 eden_top_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_top_offset);
1245 eden_end_adr = basic_plus_adr(top()/*not oop*/, thread, tlab_end_offset);
1246 } else { // Shared allocation: load from globals
1247 CollectedHeap* ch = Universe::heap();
1248 address top_adr = (address)ch->top_addr();
1249 address end_adr = (address)ch->end_addr();
1250 eden_top_adr = makecon(TypeRawPtr::make(top_adr));
1251 eden_end_adr = basic_plus_adr(eden_top_adr, end_adr - top_adr);
1252 }
1253 }
1254
1255
1256 Node* PhaseMacroExpand::make_load(Node* ctl, Node* mem, Node* base, int offset, const Type* value_type, BasicType bt) {
1257 Node* adr = basic_plus_adr(base, offset);
1258 const TypePtr* adr_type = adr->bottom_type()->is_ptr();
1259 Node* value = LoadNode::make(_igvn, ctl, mem, adr, adr_type, value_type, bt, MemNode::unordered);
1260 transform_later(value);
1261 return value;
1262 }
1263
1264
1265 Node* PhaseMacroExpand::make_store(Node* ctl, Node* mem, Node* base, int offset, Node* value, BasicType bt) {
1266 Node* adr = basic_plus_adr(base, offset);
1267 mem = StoreNode::make(_igvn, ctl, mem, adr, NULL, value, bt, MemNode::unordered);
1268 transform_later(mem);
1269 return mem;
1270 }
1271
1272 //=============================================================================
1273 //
1274 // A L L O C A T I O N
1275 //
1276 // Allocation attempts to be fast in the case of frequent small objects.
1277 // It breaks down like this:
1278 //
1279 // 1) Size in doublewords is computed. This is a constant for objects and
1280 // variable for most arrays. Doubleword units are used to avoid size
1281 // overflow of huge doubleword arrays. We need doublewords in the end for
1282 // rounding.
1283 //
1284 // 2) Size is checked for being 'too large'. Too-large allocations will go
1285 // the slow path into the VM. The slow path can throw any required
1286 // exceptions, and does all the special checks for very large arrays. The
1287 // size test can constant-fold away for objects. For objects with
1288 // finalizers it constant-folds the otherway: you always go slow with
1289 // finalizers.
1290 //
1291 // 3) If NOT using TLABs, this is the contended loop-back point.
1292 // Load-Locked the heap top. If using TLABs normal-load the heap top.
1293 //
1294 // 4) Check that heap top + size*8 < max. If we fail go the slow ` route.
1295 // NOTE: "top+size*8" cannot wrap the 4Gig line! Here's why: for largish
1296 // "size*8" we always enter the VM, where "largish" is a constant picked small
1297 // enough that there's always space between the eden max and 4Gig (old space is
1298 // there so it's quite large) and large enough that the cost of entering the VM
1299 // is dwarfed by the cost to initialize the space.
1300 //
1301 // 5) If NOT using TLABs, Store-Conditional the adjusted heap top back
1302 // down. If contended, repeat at step 3. If using TLABs normal-store
1303 // adjusted heap top back down; there is no contention.
1304 //
1305 // 6) If !ZeroTLAB then Bulk-clear the object/array. Fill in klass & mark
1306 // fields.
1307 //
1308 // 7) Merge with the slow-path; cast the raw memory pointer to the correct
1309 // oop flavor.
1310 //
1311 //=============================================================================
1312 // FastAllocateSizeLimit value is in DOUBLEWORDS.
1313 // Allocations bigger than this always go the slow route.
1314 // This value must be small enough that allocation attempts that need to
1315 // trigger exceptions go the slow route. Also, it must be small enough so
1316 // that heap_top + size_in_bytes does not wrap around the 4Gig limit.
1317 //=============================================================================j//
1318 // %%% Here is an old comment from parseHelper.cpp; is it outdated?
1319 // The allocator will coalesce int->oop copies away. See comment in
1320 // coalesce.cpp about how this works. It depends critically on the exact
1321 // code shape produced here, so if you are changing this code shape
1322 // make sure the GC info for the heap-top is correct in and around the
1323 // slow-path call.
1324 //
1325
1326 void PhaseMacroExpand::expand_allocate_common(
1327 AllocateNode* alloc, // allocation node to be expanded
1328 Node* length, // array length for an array allocation
1329 const TypeFunc* slow_call_type, // Type of slow call
1330 address slow_call_address // Address of slow call
1331 )
1332 {
1333
1334 Node* ctrl = alloc->in(TypeFunc::Control);
1335 Node* mem = alloc->in(TypeFunc::Memory);
1336 Node* i_o = alloc->in(TypeFunc::I_O);
1337 Node* size_in_bytes = alloc->in(AllocateNode::AllocSize);
1338 Node* klass_node = alloc->in(AllocateNode::KlassNode);
1339 Node* initial_slow_test = alloc->in(AllocateNode::InitialTest);
1340
1341 assert(ctrl != NULL, "must have control");
1342 // We need a Region and corresponding Phi's to merge the slow-path and fast-path results.
1343 // they will not be used if "always_slow" is set
1344 enum { slow_result_path = 1, fast_result_path = 2 };
1345 Node *result_region = NULL;
1346 Node *result_phi_rawmem = NULL;
1347 Node *result_phi_rawoop = NULL;
1348 Node *result_phi_i_o = NULL;
1349
1350 // The initial slow comparison is a size check, the comparison
1351 // we want to do is a BoolTest::gt
1352 bool always_slow = false;
1353 int tv = _igvn.find_int_con(initial_slow_test, -1);
1354 if (tv >= 0) {
1355 always_slow = (tv == 1);
1356 initial_slow_test = NULL;
1357 } else {
1358 initial_slow_test = BoolNode::make_predicate(initial_slow_test, &_igvn);
1359 }
1360
1361 if (C->env()->dtrace_alloc_probes() ||
1362 !UseTLAB && (!Universe::heap()->supports_inline_contig_alloc())) {
1363 // Force slow-path allocation
1364 always_slow = true;
1365 initial_slow_test = NULL;
1366 }
1367
1368
1369 enum { too_big_or_final_path = 1, need_gc_path = 2 };
1370 Node *slow_region = NULL;
1371 Node *toobig_false = ctrl;
1372
1373 assert (initial_slow_test == NULL || !always_slow, "arguments must be consistent");
1374 // generate the initial test if necessary
1375 if (initial_slow_test != NULL ) {
1376 slow_region = new RegionNode(3);
1377
1378 // Now make the initial failure test. Usually a too-big test but
1379 // might be a TRUE for finalizers or a fancy class check for
1380 // newInstance0.
1381 IfNode *toobig_iff = new IfNode(ctrl, initial_slow_test, PROB_MIN, COUNT_UNKNOWN);
1382 transform_later(toobig_iff);
1383 // Plug the failing-too-big test into the slow-path region
1384 Node *toobig_true = new IfTrueNode( toobig_iff );
1385 transform_later(toobig_true);
1386 slow_region ->init_req( too_big_or_final_path, toobig_true );
1387 toobig_false = new IfFalseNode( toobig_iff );
1388 transform_later(toobig_false);
1389 } else { // No initial test, just fall into next case
1390 toobig_false = ctrl;
1391 debug_only(slow_region = NodeSentinel);
1392 }
1393
1394 Node *slow_mem = mem; // save the current memory state for slow path
1395 // generate the fast allocation code unless we know that the initial test will always go slow
1396 if (!always_slow) {
1397 // Fast path modifies only raw memory.
1398 if (mem->is_MergeMem()) {
1399 mem = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw);
1400 }
1401
1402 Node* eden_top_adr;
1403 Node* eden_end_adr;
1404
1405 set_eden_pointers(eden_top_adr, eden_end_adr);
1406
1407 // Load Eden::end. Loop invariant and hoisted.
1408 //
1409 // Note: We set the control input on "eden_end" and "old_eden_top" when using
1410 // a TLAB to work around a bug where these values were being moved across
1411 // a safepoint. These are not oops, so they cannot be include in the oop
1412 // map, but they can be changed by a GC. The proper way to fix this would
1413 // be to set the raw memory state when generating a SafepointNode. However
1414 // this will require extensive changes to the loop optimization in order to
1415 // prevent a degradation of the optimization.
1416 // See comment in memnode.hpp, around line 227 in class LoadPNode.
1417 Node *eden_end = make_load(ctrl, mem, eden_end_adr, 0, TypeRawPtr::BOTTOM, T_ADDRESS);
1418
1419 // allocate the Region and Phi nodes for the result
1420 result_region = new RegionNode(3);
1421 result_phi_rawmem = new PhiNode(result_region, Type::MEMORY, TypeRawPtr::BOTTOM);
1422 result_phi_rawoop = new PhiNode(result_region, TypeRawPtr::BOTTOM);
1423 result_phi_i_o = new PhiNode(result_region, Type::ABIO); // I/O is used for Prefetch
1424
1425 // We need a Region for the loop-back contended case.
1426 enum { fall_in_path = 1, contended_loopback_path = 2 };
1427 Node *contended_region;
1428 Node *contended_phi_rawmem;
1429 if (UseTLAB) {
1430 contended_region = toobig_false;
1431 contended_phi_rawmem = mem;
1432 } else {
1433 contended_region = new RegionNode(3);
1434 contended_phi_rawmem = new PhiNode(contended_region, Type::MEMORY, TypeRawPtr::BOTTOM);
1435 // Now handle the passing-too-big test. We fall into the contended
1436 // loop-back merge point.
1437 contended_region ->init_req(fall_in_path, toobig_false);
1438 contended_phi_rawmem->init_req(fall_in_path, mem);
1439 transform_later(contended_region);
1440 transform_later(contended_phi_rawmem);
1441 }
1442
1443 // Load(-locked) the heap top.
1444 // See note above concerning the control input when using a TLAB
1445 Node *old_eden_top = UseTLAB
1446 ? new LoadPNode (ctrl, contended_phi_rawmem, eden_top_adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM, MemNode::unordered)
1447 : new LoadPLockedNode(contended_region, contended_phi_rawmem, eden_top_adr, MemNode::acquire);
1448
1449 transform_later(old_eden_top);
1450 // Add to heap top to get a new heap top
1451 Node *new_eden_top = new AddPNode(top(), old_eden_top, size_in_bytes);
1452 transform_later(new_eden_top);
1453 // Check for needing a GC; compare against heap end
1454 Node *needgc_cmp = new CmpPNode(new_eden_top, eden_end);
1455 transform_later(needgc_cmp);
1456 Node *needgc_bol = new BoolNode(needgc_cmp, BoolTest::ge);
1457 transform_later(needgc_bol);
1458 IfNode *needgc_iff = new IfNode(contended_region, needgc_bol, PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN);
1459 transform_later(needgc_iff);
1460
1461 // Plug the failing-heap-space-need-gc test into the slow-path region
1462 Node *needgc_true = new IfTrueNode(needgc_iff);
1463 transform_later(needgc_true);
1464 if (initial_slow_test) {
1465 slow_region->init_req(need_gc_path, needgc_true);
1466 // This completes all paths into the slow merge point
1467 transform_later(slow_region);
1468 } else { // No initial slow path needed!
1469 // Just fall from the need-GC path straight into the VM call.
1470 slow_region = needgc_true;
1471 }
1472 // No need for a GC. Setup for the Store-Conditional
1473 Node *needgc_false = new IfFalseNode(needgc_iff);
1474 transform_later(needgc_false);
1475
1476 // Grab regular I/O before optional prefetch may change it.
1477 // Slow-path does no I/O so just set it to the original I/O.
1478 result_phi_i_o->init_req(slow_result_path, i_o);
1479
1480 i_o = prefetch_allocation(i_o, needgc_false, contended_phi_rawmem,
1481 old_eden_top, new_eden_top, length);
1482
1483 // Name successful fast-path variables
1484 Node* fast_oop = old_eden_top;
1485 Node* fast_oop_ctrl;
1486 Node* fast_oop_rawmem;
1487
1488 // Store (-conditional) the modified eden top back down.
1489 // StorePConditional produces flags for a test PLUS a modified raw
1490 // memory state.
1491 if (UseTLAB) {
1492 Node* store_eden_top =
1493 new StorePNode(needgc_false, contended_phi_rawmem, eden_top_adr,
1494 TypeRawPtr::BOTTOM, new_eden_top, MemNode::unordered);
1495 transform_later(store_eden_top);
1496 fast_oop_ctrl = needgc_false; // No contention, so this is the fast path
1497 fast_oop_rawmem = store_eden_top;
1498 } else {
1499 Node* store_eden_top =
1500 new StorePConditionalNode(needgc_false, contended_phi_rawmem, eden_top_adr,
1501 new_eden_top, fast_oop/*old_eden_top*/);
1502 transform_later(store_eden_top);
1503 Node *contention_check = new BoolNode(store_eden_top, BoolTest::ne);
1504 transform_later(contention_check);
1505 store_eden_top = new SCMemProjNode(store_eden_top);
1506 transform_later(store_eden_top);
1507
1508 // If not using TLABs, check to see if there was contention.
1509 IfNode *contention_iff = new IfNode (needgc_false, contention_check, PROB_MIN, COUNT_UNKNOWN);
1510 transform_later(contention_iff);
1511 Node *contention_true = new IfTrueNode(contention_iff);
1512 transform_later(contention_true);
1513 // If contention, loopback and try again.
1514 contended_region->init_req(contended_loopback_path, contention_true);
1515 contended_phi_rawmem->init_req(contended_loopback_path, store_eden_top);
1516
1517 // Fast-path succeeded with no contention!
1518 Node *contention_false = new IfFalseNode(contention_iff);
1519 transform_later(contention_false);
1520 fast_oop_ctrl = contention_false;
1521
1522 // Bump total allocated bytes for this thread
1523 Node* thread = new ThreadLocalNode();
1524 transform_later(thread);
1525 Node* alloc_bytes_adr = basic_plus_adr(top()/*not oop*/, thread,
1526 in_bytes(JavaThread::allocated_bytes_offset()));
1527 Node* alloc_bytes = make_load(fast_oop_ctrl, store_eden_top, alloc_bytes_adr,
1528 0, TypeLong::LONG, T_LONG);
1529 #ifdef _LP64
1530 Node* alloc_size = size_in_bytes;
1531 #else
1532 Node* alloc_size = new ConvI2LNode(size_in_bytes);
1533 transform_later(alloc_size);
1534 #endif
1535 Node* new_alloc_bytes = new AddLNode(alloc_bytes, alloc_size);
1536 transform_later(new_alloc_bytes);
1537 fast_oop_rawmem = make_store(fast_oop_ctrl, store_eden_top, alloc_bytes_adr,
1538 0, new_alloc_bytes, T_LONG);
1539 }
1540
1541 InitializeNode* init = alloc->initialization();
1542 fast_oop_rawmem = initialize_object(alloc,
1543 fast_oop_ctrl, fast_oop_rawmem, fast_oop,
1544 klass_node, length, size_in_bytes);
1545
1546 // If initialization is performed by an array copy, any required
1547 // MemBarStoreStore was already added. If the object does not
1548 // escape no need for a MemBarStoreStore. If the object does not
1549 // escape in its initializer and memory barrier (MemBarStoreStore or
1550 // stronger) is already added at exit of initializer, also no need
1551 // for a MemBarStoreStore. Otherwise we need a MemBarStoreStore
1552 // so that stores that initialize this object can't be reordered
1553 // with a subsequent store that makes this object accessible by
1554 // other threads.
1555 // Other threads include java threads and JVM internal threads
1556 // (for example concurrent GC threads). Current concurrent GC
1557 // implementation: CMS and G1 will not scan newly created object,
1558 // so it's safe to skip storestore barrier when allocation does
1559 // not escape.
1560 if (!alloc->does_not_escape_thread() &&
1561 !alloc->is_allocation_MemBar_redundant() &&
1562 (init == NULL || !init->is_complete_with_arraycopy())) {
1563 if (init == NULL || init->req() < InitializeNode::RawStores) {
1564 // No InitializeNode or no stores captured by zeroing
1565 // elimination. Simply add the MemBarStoreStore after object
1566 // initialization.
1567 MemBarNode* mb = MemBarNode::make(C, Op_MemBarStoreStore, Compile::AliasIdxBot);
1568 transform_later(mb);
1569
1570 mb->init_req(TypeFunc::Memory, fast_oop_rawmem);
1571 mb->init_req(TypeFunc::Control, fast_oop_ctrl);
1572 fast_oop_ctrl = new ProjNode(mb,TypeFunc::Control);
1573 transform_later(fast_oop_ctrl);
1574 fast_oop_rawmem = new ProjNode(mb,TypeFunc::Memory);
1575 transform_later(fast_oop_rawmem);
1576 } else {
1577 // Add the MemBarStoreStore after the InitializeNode so that
1578 // all stores performing the initialization that were moved
1579 // before the InitializeNode happen before the storestore
1580 // barrier.
1581
1582 Node* init_ctrl = init->proj_out(TypeFunc::Control);
1583 Node* init_mem = init->proj_out(TypeFunc::Memory);
1584
1585 MemBarNode* mb = MemBarNode::make(C, Op_MemBarStoreStore, Compile::AliasIdxBot);
1586 transform_later(mb);
1587
1588 Node* ctrl = new ProjNode(init,TypeFunc::Control);
1589 transform_later(ctrl);
1590 Node* mem = new ProjNode(init,TypeFunc::Memory);
1591 transform_later(mem);
1592
1593 // The MemBarStoreStore depends on control and memory coming
1594 // from the InitializeNode
1595 mb->init_req(TypeFunc::Memory, mem);
1596 mb->init_req(TypeFunc::Control, ctrl);
1597
1598 ctrl = new ProjNode(mb,TypeFunc::Control);
1599 transform_later(ctrl);
1600 mem = new ProjNode(mb,TypeFunc::Memory);
1601 transform_later(mem);
1602
1603 // All nodes that depended on the InitializeNode for control
1604 // and memory must now depend on the MemBarNode that itself
1605 // depends on the InitializeNode
1606 if (init_ctrl != NULL) {
1607 _igvn.replace_node(init_ctrl, ctrl);
1608 }
1609 if (init_mem != NULL) {
1610 _igvn.replace_node(init_mem, mem);
1611 }
1612 }
1613 }
1614
1615 if (C->env()->dtrace_extended_probes()) {
1616 // Slow-path call
1617 int size = TypeFunc::Parms + 2;
1618 CallLeafNode *call = new CallLeafNode(OptoRuntime::dtrace_object_alloc_Type(),
1619 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc_base),
1620 "dtrace_object_alloc",
1621 TypeRawPtr::BOTTOM);
1622
1623 // Get base of thread-local storage area
1624 Node* thread = new ThreadLocalNode();
1625 transform_later(thread);
1626
1627 call->init_req(TypeFunc::Parms+0, thread);
1628 call->init_req(TypeFunc::Parms+1, fast_oop);
1629 call->init_req(TypeFunc::Control, fast_oop_ctrl);
1630 call->init_req(TypeFunc::I_O , top()); // does no i/o
1631 call->init_req(TypeFunc::Memory , fast_oop_rawmem);
1632 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr));
1633 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr));
1634 transform_later(call);
1635 fast_oop_ctrl = new ProjNode(call,TypeFunc::Control);
1636 transform_later(fast_oop_ctrl);
1637 fast_oop_rawmem = new ProjNode(call,TypeFunc::Memory);
1638 transform_later(fast_oop_rawmem);
1639 }
1640
1641 // Plug in the successful fast-path into the result merge point
1642 result_region ->init_req(fast_result_path, fast_oop_ctrl);
1643 result_phi_rawoop->init_req(fast_result_path, fast_oop);
1644 result_phi_i_o ->init_req(fast_result_path, i_o);
1645 result_phi_rawmem->init_req(fast_result_path, fast_oop_rawmem);
1646 } else {
1647 slow_region = ctrl;
1648 result_phi_i_o = i_o; // Rename it to use in the following code.
1649 }
1650
1651 // Generate slow-path call
1652 CallNode *call = new CallStaticJavaNode(slow_call_type, slow_call_address,
1653 OptoRuntime::stub_name(slow_call_address),
1654 alloc->jvms()->bci(),
1655 TypePtr::BOTTOM);
1656 call->init_req( TypeFunc::Control, slow_region );
1657 call->init_req( TypeFunc::I_O , top() ) ; // does no i/o
1658 call->init_req( TypeFunc::Memory , slow_mem ); // may gc ptrs
1659 call->init_req( TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr) );
1660 call->init_req( TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr) );
1661
1662 call->init_req(TypeFunc::Parms+0, klass_node);
1663 if (length != NULL) {
1664 call->init_req(TypeFunc::Parms+1, length);
1665 }
1666
1667 // Copy debug information and adjust JVMState information, then replace
1668 // allocate node with the call
1669 copy_call_debug_info((CallNode *) alloc, call);
1670 if (!always_slow) {
1671 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON.
1672 } else {
1673 // Hook i_o projection to avoid its elimination during allocation
1674 // replacement (when only a slow call is generated).
1675 call->set_req(TypeFunc::I_O, result_phi_i_o);
1676 }
1677 _igvn.replace_node(alloc, call);
1678 transform_later(call);
1679
1680 // Identify the output projections from the allocate node and
1681 // adjust any references to them.
1682 // The control and io projections look like:
1683 //
1684 // v---Proj(ctrl) <-----+ v---CatchProj(ctrl)
1685 // Allocate Catch
1686 // ^---Proj(io) <-------+ ^---CatchProj(io)
1687 //
1688 // We are interested in the CatchProj nodes.
1689 //
1690 extract_call_projections(call);
1691
1692 // An allocate node has separate memory projections for the uses on
1693 // the control and i_o paths. Replace the control memory projection with
1694 // result_phi_rawmem (unless we are only generating a slow call when
1695 // both memory projections are combined)
1696 if (!always_slow && _memproj_fallthrough != NULL) {
1697 for (DUIterator_Fast imax, i = _memproj_fallthrough->fast_outs(imax); i < imax; i++) {
1698 Node *use = _memproj_fallthrough->fast_out(i);
1699 _igvn.rehash_node_delayed(use);
1700 imax -= replace_input(use, _memproj_fallthrough, result_phi_rawmem);
1701 // back up iterator
1702 --i;
1703 }
1704 }
1705 // Now change uses of _memproj_catchall to use _memproj_fallthrough and delete
1706 // _memproj_catchall so we end up with a call that has only 1 memory projection.
1707 if (_memproj_catchall != NULL ) {
1708 if (_memproj_fallthrough == NULL) {
1709 _memproj_fallthrough = new ProjNode(call, TypeFunc::Memory);
1710 transform_later(_memproj_fallthrough);
1711 }
1712 for (DUIterator_Fast imax, i = _memproj_catchall->fast_outs(imax); i < imax; i++) {
1713 Node *use = _memproj_catchall->fast_out(i);
1714 _igvn.rehash_node_delayed(use);
1715 imax -= replace_input(use, _memproj_catchall, _memproj_fallthrough);
1716 // back up iterator
1717 --i;
1718 }
1719 assert(_memproj_catchall->outcnt() == 0, "all uses must be deleted");
1720 _igvn.remove_dead_node(_memproj_catchall);
1721 }
1722
1723 // An allocate node has separate i_o projections for the uses on the control
1724 // and i_o paths. Always replace the control i_o projection with result i_o
1725 // otherwise incoming i_o become dead when only a slow call is generated
1726 // (it is different from memory projections where both projections are
1727 // combined in such case).
1728 if (_ioproj_fallthrough != NULL) {
1729 for (DUIterator_Fast imax, i = _ioproj_fallthrough->fast_outs(imax); i < imax; i++) {
1730 Node *use = _ioproj_fallthrough->fast_out(i);
1731 _igvn.rehash_node_delayed(use);
1732 imax -= replace_input(use, _ioproj_fallthrough, result_phi_i_o);
1733 // back up iterator
1734 --i;
1735 }
1736 }
1737 // Now change uses of _ioproj_catchall to use _ioproj_fallthrough and delete
1738 // _ioproj_catchall so we end up with a call that has only 1 i_o projection.
1739 if (_ioproj_catchall != NULL ) {
1740 if (_ioproj_fallthrough == NULL) {
1741 _ioproj_fallthrough = new ProjNode(call, TypeFunc::I_O);
1742 transform_later(_ioproj_fallthrough);
1743 }
1744 for (DUIterator_Fast imax, i = _ioproj_catchall->fast_outs(imax); i < imax; i++) {
1745 Node *use = _ioproj_catchall->fast_out(i);
1746 _igvn.rehash_node_delayed(use);
1747 imax -= replace_input(use, _ioproj_catchall, _ioproj_fallthrough);
1748 // back up iterator
1749 --i;
1750 }
1751 assert(_ioproj_catchall->outcnt() == 0, "all uses must be deleted");
1752 _igvn.remove_dead_node(_ioproj_catchall);
1753 }
1754
1755 // if we generated only a slow call, we are done
1756 if (always_slow) {
1757 // Now we can unhook i_o.
1758 if (result_phi_i_o->outcnt() > 1) {
1759 call->set_req(TypeFunc::I_O, top());
1760 } else {
1761 assert(result_phi_i_o->unique_ctrl_out() == call, "");
1762 // Case of new array with negative size known during compilation.
1763 // AllocateArrayNode::Ideal() optimization disconnect unreachable
1764 // following code since call to runtime will throw exception.
1765 // As result there will be no users of i_o after the call.
1766 // Leave i_o attached to this call to avoid problems in preceding graph.
1767 }
1768 return;
1769 }
1770
1771
1772 if (_fallthroughcatchproj != NULL) {
1773 ctrl = _fallthroughcatchproj->clone();
1774 transform_later(ctrl);
1775 _igvn.replace_node(_fallthroughcatchproj, result_region);
1776 } else {
1777 ctrl = top();
1778 }
1779 Node *slow_result;
1780 if (_resproj == NULL) {
1781 // no uses of the allocation result
1782 slow_result = top();
1783 } else {
1784 slow_result = _resproj->clone();
1785 transform_later(slow_result);
1786 _igvn.replace_node(_resproj, result_phi_rawoop);
1787 }
1788
1789 // Plug slow-path into result merge point
1790 result_region ->init_req( slow_result_path, ctrl );
1791 result_phi_rawoop->init_req( slow_result_path, slow_result);
1792 result_phi_rawmem->init_req( slow_result_path, _memproj_fallthrough );
1793 transform_later(result_region);
1794 transform_later(result_phi_rawoop);
1795 transform_later(result_phi_rawmem);
1796 transform_later(result_phi_i_o);
1797 // This completes all paths into the result merge point
1798 }
1799
1800
1801 // Helper for PhaseMacroExpand::expand_allocate_common.
1802 // Initializes the newly-allocated storage.
1803 Node*
1804 PhaseMacroExpand::initialize_object(AllocateNode* alloc,
1805 Node* control, Node* rawmem, Node* object,
1806 Node* klass_node, Node* length,
1807 Node* size_in_bytes) {
1808 InitializeNode* init = alloc->initialization();
1809 // Store the klass & mark bits
1810 Node* mark_node = NULL;
1811 // For now only enable fast locking for non-array types
1812 if (UseBiasedLocking && (length == NULL)) {
1813 mark_node = make_load(control, rawmem, klass_node, in_bytes(Klass::prototype_header_offset()), TypeRawPtr::BOTTOM, T_ADDRESS);
1814 } else {
1815 mark_node = makecon(TypeRawPtr::make((address)markOopDesc::prototype()));
1816 }
1817 rawmem = make_store(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, T_ADDRESS);
1818
1819 rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_METADATA);
1820 int header_size = alloc->minimum_header_size(); // conservatively small
1821
1822 // Array length
1823 if (length != NULL) { // Arrays need length field
1824 rawmem = make_store(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT);
1825 // conservatively small header size:
1826 header_size = arrayOopDesc::base_offset_in_bytes(T_BYTE);
1827 ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass();
1828 if (k->is_array_klass()) // we know the exact header size in most cases:
1829 header_size = Klass::layout_helper_header_size(k->layout_helper());
1830 }
1831
1832 // Clear the object body, if necessary.
1833 if (init == NULL) {
1834 // The init has somehow disappeared; be cautious and clear everything.
1835 //
1836 // This can happen if a node is allocated but an uncommon trap occurs
1837 // immediately. In this case, the Initialize gets associated with the
1838 // trap, and may be placed in a different (outer) loop, if the Allocate
1839 // is in a loop. If (this is rare) the inner loop gets unrolled, then
1840 // there can be two Allocates to one Initialize. The answer in all these
1841 // edge cases is safety first. It is always safe to clear immediately
1842 // within an Allocate, and then (maybe or maybe not) clear some more later.
1843 if (!(UseTLAB && ZeroTLAB)) {
1844 rawmem = ClearArrayNode::clear_memory(control, rawmem, object,
1845 header_size, size_in_bytes,
1846 &_igvn);
1847 }
1848 } else {
1849 if (!init->is_complete()) {
1850 // Try to win by zeroing only what the init does not store.
1851 // We can also try to do some peephole optimizations,
1852 // such as combining some adjacent subword stores.
1853 rawmem = init->complete_stores(control, rawmem, object,
1854 header_size, size_in_bytes, &_igvn);
1855 }
1856 // We have no more use for this link, since the AllocateNode goes away:
1857 init->set_req(InitializeNode::RawAddress, top());
1858 // (If we keep the link, it just confuses the register allocator,
1859 // who thinks he sees a real use of the address by the membar.)
1860 }
1861
1862 return rawmem;
1863 }
1864
1865 // Generate prefetch instructions for next allocations.
1866 Node* PhaseMacroExpand::prefetch_allocation(Node* i_o, Node*& needgc_false,
1867 Node*& contended_phi_rawmem,
1868 Node* old_eden_top, Node* new_eden_top,
1869 Node* length) {
1870 enum { fall_in_path = 1, pf_path = 2 };
1871 if( UseTLAB && AllocatePrefetchStyle == 2 ) {
1872 // Generate prefetch allocation with watermark check.
1873 // As an allocation hits the watermark, we will prefetch starting
1874 // at a "distance" away from watermark.
1875
1876 Node *pf_region = new RegionNode(3);
1877 Node *pf_phi_rawmem = new PhiNode( pf_region, Type::MEMORY,
1878 TypeRawPtr::BOTTOM );
1879 // I/O is used for Prefetch
1880 Node *pf_phi_abio = new PhiNode( pf_region, Type::ABIO );
1881
1882 Node *thread = new ThreadLocalNode();
1883 transform_later(thread);
1884
1885 Node *eden_pf_adr = new AddPNode( top()/*not oop*/, thread,
1886 _igvn.MakeConX(in_bytes(JavaThread::tlab_pf_top_offset())) );
1887 transform_later(eden_pf_adr);
1888
1889 Node *old_pf_wm = new LoadPNode(needgc_false,
1890 contended_phi_rawmem, eden_pf_adr,
1891 TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM,
1892 MemNode::unordered);
1893 transform_later(old_pf_wm);
1894
1895 // check against new_eden_top
1896 Node *need_pf_cmp = new CmpPNode( new_eden_top, old_pf_wm );
1897 transform_later(need_pf_cmp);
1898 Node *need_pf_bol = new BoolNode( need_pf_cmp, BoolTest::ge );
1899 transform_later(need_pf_bol);
1900 IfNode *need_pf_iff = new IfNode( needgc_false, need_pf_bol,
1901 PROB_UNLIKELY_MAG(4), COUNT_UNKNOWN );
1902 transform_later(need_pf_iff);
1903
1904 // true node, add prefetchdistance
1905 Node *need_pf_true = new IfTrueNode( need_pf_iff );
1906 transform_later(need_pf_true);
1907
1908 Node *need_pf_false = new IfFalseNode( need_pf_iff );
1909 transform_later(need_pf_false);
1910
1911 Node *new_pf_wmt = new AddPNode( top(), old_pf_wm,
1912 _igvn.MakeConX(AllocatePrefetchDistance) );
1913 transform_later(new_pf_wmt );
1914 new_pf_wmt->set_req(0, need_pf_true);
1915
1916 Node *store_new_wmt = new StorePNode(need_pf_true,
1917 contended_phi_rawmem, eden_pf_adr,
1918 TypeRawPtr::BOTTOM, new_pf_wmt,
1919 MemNode::unordered);
1920 transform_later(store_new_wmt);
1921
1922 // adding prefetches
1923 pf_phi_abio->init_req( fall_in_path, i_o );
1924
1925 Node *prefetch_adr;
1926 Node *prefetch;
1927 uint lines = (length != NULL) ? AllocatePrefetchLines : AllocateInstancePrefetchLines;
1928 uint step_size = AllocatePrefetchStepSize;
1929 uint distance = 0;
1930
1931 for ( uint i = 0; i < lines; i++ ) {
1932 prefetch_adr = new AddPNode( old_pf_wm, new_pf_wmt,
1933 _igvn.MakeConX(distance) );
1934 transform_later(prefetch_adr);
1935 prefetch = new PrefetchAllocationNode( i_o, prefetch_adr );
1936 transform_later(prefetch);
1937 distance += step_size;
1938 i_o = prefetch;
1939 }
1940 pf_phi_abio->set_req( pf_path, i_o );
1941
1942 pf_region->init_req( fall_in_path, need_pf_false );
1943 pf_region->init_req( pf_path, need_pf_true );
1944
1945 pf_phi_rawmem->init_req( fall_in_path, contended_phi_rawmem );
1946 pf_phi_rawmem->init_req( pf_path, store_new_wmt );
1947
1948 transform_later(pf_region);
1949 transform_later(pf_phi_rawmem);
1950 transform_later(pf_phi_abio);
1951
1952 needgc_false = pf_region;
1953 contended_phi_rawmem = pf_phi_rawmem;
1954 i_o = pf_phi_abio;
1955 } else if( UseTLAB && AllocatePrefetchStyle == 3 ) {
1956 // Insert a prefetch instruction for each allocation.
1957 // This code is used to generate 1 prefetch instruction per cache line.
1958
1959 // Generate several prefetch instructions.
1960 uint lines = (length != NULL) ? AllocatePrefetchLines : AllocateInstancePrefetchLines;
1961 uint step_size = AllocatePrefetchStepSize;
1962 uint distance = AllocatePrefetchDistance;
1963
1964 // Next cache address.
1965 Node *cache_adr = new AddPNode(old_eden_top, old_eden_top,
1966 _igvn.MakeConX(step_size + distance));
1967 transform_later(cache_adr);
1968 cache_adr = new CastP2XNode(needgc_false, cache_adr);
1969 transform_later(cache_adr);
1970 // Address is aligned to execute prefetch to the beginning of cache line size
1971 // (it is important when BIS instruction is used on SPARC as prefetch).
1972 Node* mask = _igvn.MakeConX(~(intptr_t)(step_size-1));
1973 cache_adr = new AndXNode(cache_adr, mask);
1974 transform_later(cache_adr);
1975 cache_adr = new CastX2PNode(cache_adr);
1976 transform_later(cache_adr);
1977
1978 // Prefetch
1979 Node *prefetch = new PrefetchAllocationNode( contended_phi_rawmem, cache_adr );
1980 prefetch->set_req(0, needgc_false);
1981 transform_later(prefetch);
1982 contended_phi_rawmem = prefetch;
1983 Node *prefetch_adr;
1984 distance = step_size;
1985 for ( uint i = 1; i < lines; i++ ) {
1986 prefetch_adr = new AddPNode( cache_adr, cache_adr,
1987 _igvn.MakeConX(distance) );
1988 transform_later(prefetch_adr);
1989 prefetch = new PrefetchAllocationNode( contended_phi_rawmem, prefetch_adr );
1990 transform_later(prefetch);
1991 distance += step_size;
1992 contended_phi_rawmem = prefetch;
1993 }
1994 } else if( AllocatePrefetchStyle > 0 ) {
1995 // Insert a prefetch for each allocation only on the fast-path
1996 Node *prefetch_adr;
1997 Node *prefetch;
1998 // Generate several prefetch instructions.
1999 uint lines = (length != NULL) ? AllocatePrefetchLines : AllocateInstancePrefetchLines;
2000 uint step_size = AllocatePrefetchStepSize;
2001 uint distance = AllocatePrefetchDistance;
2002 for ( uint i = 0; i < lines; i++ ) {
2003 prefetch_adr = new AddPNode( old_eden_top, new_eden_top,
2004 _igvn.MakeConX(distance) );
2005 transform_later(prefetch_adr);
2006 prefetch = new PrefetchAllocationNode( i_o, prefetch_adr );
2007 // Do not let it float too high, since if eden_top == eden_end,
2008 // both might be null.
2009 if( i == 0 ) { // Set control for first prefetch, next follows it
2010 prefetch->init_req(0, needgc_false);
2011 }
2012 transform_later(prefetch);
2013 distance += step_size;
2014 i_o = prefetch;
2015 }
2016 }
2017 return i_o;
2018 }
2019
2020
2021 void PhaseMacroExpand::expand_allocate(AllocateNode *alloc) {
2022 expand_allocate_common(alloc, NULL,
2023 OptoRuntime::new_instance_Type(),
2024 OptoRuntime::new_instance_Java());
2025 }
2026
2027 void PhaseMacroExpand::expand_allocate_array(AllocateArrayNode *alloc) {
2028 Node* length = alloc->in(AllocateNode::ALength);
2029 InitializeNode* init = alloc->initialization();
2030 Node* klass_node = alloc->in(AllocateNode::KlassNode);
2031 ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass();
2032 address slow_call_address; // Address of slow call
2033 if (init != NULL && init->is_complete_with_arraycopy() &&
2034 k->is_type_array_klass()) {
2035 // Don't zero type array during slow allocation in VM since
2036 // it will be initialized later by arraycopy in compiled code.
2037 slow_call_address = OptoRuntime::new_array_nozero_Java();
2038 } else {
2039 slow_call_address = OptoRuntime::new_array_Java();
2040 }
2041 expand_allocate_common(alloc, length,
2042 OptoRuntime::new_array_Type(),
2043 slow_call_address);
2044 }
2045
2046 //-------------------mark_eliminated_box----------------------------------
2047 //
2048 // During EA obj may point to several objects but after few ideal graph
2049 // transformations (CCP) it may point to only one non escaping object
2050 // (but still using phi), corresponding locks and unlocks will be marked
2051 // for elimination. Later obj could be replaced with a new node (new phi)
2052 // and which does not have escape information. And later after some graph
2053 // reshape other locks and unlocks (which were not marked for elimination
2054 // before) are connected to this new obj (phi) but they still will not be
2055 // marked for elimination since new obj has no escape information.
2056 // Mark all associated (same box and obj) lock and unlock nodes for
2057 // elimination if some of them marked already.
2058 void PhaseMacroExpand::mark_eliminated_box(Node* oldbox, Node* obj) {
2059 if (oldbox->as_BoxLock()->is_eliminated())
2060 return; // This BoxLock node was processed already.
2061
2062 // New implementation (EliminateNestedLocks) has separate BoxLock
2063 // node for each locked region so mark all associated locks/unlocks as
2064 // eliminated even if different objects are referenced in one locked region
2065 // (for example, OSR compilation of nested loop inside locked scope).
2066 if (EliminateNestedLocks ||
2067 oldbox->as_BoxLock()->is_simple_lock_region(NULL, obj)) {
2068 // Box is used only in one lock region. Mark this box as eliminated.
2069 _igvn.hash_delete(oldbox);
2070 oldbox->as_BoxLock()->set_eliminated(); // This changes box's hash value
2071 _igvn.hash_insert(oldbox);
2072
2073 for (uint i = 0; i < oldbox->outcnt(); i++) {
2074 Node* u = oldbox->raw_out(i);
2075 if (u->is_AbstractLock() && !u->as_AbstractLock()->is_non_esc_obj()) {
2076 AbstractLockNode* alock = u->as_AbstractLock();
2077 // Check lock's box since box could be referenced by Lock's debug info.
2078 if (alock->box_node() == oldbox) {
2079 // Mark eliminated all related locks and unlocks.
2080 #ifdef ASSERT
2081 alock->log_lock_optimization(C, "eliminate_lock_set_non_esc4");
2082 #endif
2083 alock->set_non_esc_obj();
2084 }
2085 }
2086 }
2087 return;
2088 }
2089
2090 // Create new "eliminated" BoxLock node and use it in monitor debug info
2091 // instead of oldbox for the same object.
2092 BoxLockNode* newbox = oldbox->clone()->as_BoxLock();
2093
2094 // Note: BoxLock node is marked eliminated only here and it is used
2095 // to indicate that all associated lock and unlock nodes are marked
2096 // for elimination.
2097 newbox->set_eliminated();
2098 transform_later(newbox);
2099
2100 // Replace old box node with new box for all users of the same object.
2101 for (uint i = 0; i < oldbox->outcnt();) {
2102 bool next_edge = true;
2103
2104 Node* u = oldbox->raw_out(i);
2105 if (u->is_AbstractLock()) {
2106 AbstractLockNode* alock = u->as_AbstractLock();
2107 if (alock->box_node() == oldbox && alock->obj_node()->eqv_uncast(obj)) {
2108 // Replace Box and mark eliminated all related locks and unlocks.
2109 #ifdef ASSERT
2110 alock->log_lock_optimization(C, "eliminate_lock_set_non_esc5");
2111 #endif
2112 alock->set_non_esc_obj();
2113 _igvn.rehash_node_delayed(alock);
2114 alock->set_box_node(newbox);
2115 next_edge = false;
2116 }
2117 }
2118 if (u->is_FastLock() && u->as_FastLock()->obj_node()->eqv_uncast(obj)) {
2119 FastLockNode* flock = u->as_FastLock();
2120 assert(flock->box_node() == oldbox, "sanity");
2121 _igvn.rehash_node_delayed(flock);
2122 flock->set_box_node(newbox);
2123 next_edge = false;
2124 }
2125
2126 // Replace old box in monitor debug info.
2127 if (u->is_SafePoint() && u->as_SafePoint()->jvms()) {
2128 SafePointNode* sfn = u->as_SafePoint();
2129 JVMState* youngest_jvms = sfn->jvms();
2130 int max_depth = youngest_jvms->depth();
2131 for (int depth = 1; depth <= max_depth; depth++) {
2132 JVMState* jvms = youngest_jvms->of_depth(depth);
2133 int num_mon = jvms->nof_monitors();
2134 // Loop over monitors
2135 for (int idx = 0; idx < num_mon; idx++) {
2136 Node* obj_node = sfn->monitor_obj(jvms, idx);
2137 Node* box_node = sfn->monitor_box(jvms, idx);
2138 if (box_node == oldbox && obj_node->eqv_uncast(obj)) {
2139 int j = jvms->monitor_box_offset(idx);
2140 _igvn.replace_input_of(u, j, newbox);
2141 next_edge = false;
2142 }
2143 }
2144 }
2145 }
2146 if (next_edge) i++;
2147 }
2148 }
2149
2150 //-----------------------mark_eliminated_locking_nodes-----------------------
2151 void PhaseMacroExpand::mark_eliminated_locking_nodes(AbstractLockNode *alock) {
2152 if (EliminateNestedLocks) {
2153 if (alock->is_nested()) {
2154 assert(alock->box_node()->as_BoxLock()->is_eliminated(), "sanity");
2155 return;
2156 } else if (!alock->is_non_esc_obj()) { // Not eliminated or coarsened
2157 // Only Lock node has JVMState needed here.
2158 // Not that preceding claim is documented anywhere else.
2159 if (alock->jvms() != NULL) {
2160 if (alock->as_Lock()->is_nested_lock_region()) {
2161 // Mark eliminated related nested locks and unlocks.
2162 Node* obj = alock->obj_node();
2163 BoxLockNode* box_node = alock->box_node()->as_BoxLock();
2164 assert(!box_node->is_eliminated(), "should not be marked yet");
2165 // Note: BoxLock node is marked eliminated only here
2166 // and it is used to indicate that all associated lock
2167 // and unlock nodes are marked for elimination.
2168 box_node->set_eliminated(); // Box's hash is always NO_HASH here
2169 for (uint i = 0; i < box_node->outcnt(); i++) {
2170 Node* u = box_node->raw_out(i);
2171 if (u->is_AbstractLock()) {
2172 alock = u->as_AbstractLock();
2173 if (alock->box_node() == box_node) {
2174 // Verify that this Box is referenced only by related locks.
2175 assert(alock->obj_node()->eqv_uncast(obj), "");
2176 // Mark all related locks and unlocks.
2177 #ifdef ASSERT
2178 alock->log_lock_optimization(C, "eliminate_lock_set_nested");
2179 #endif
2180 alock->set_nested();
2181 }
2182 }
2183 }
2184 } else {
2185 #ifdef ASSERT
2186 alock->log_lock_optimization(C, "eliminate_lock_NOT_nested_lock_region");
2187 if (C->log() != NULL)
2188 alock->as_Lock()->is_nested_lock_region(C); // rerun for debugging output
2189 #endif
2190 }
2191 }
2192 return;
2193 }
2194 // Process locks for non escaping object
2195 assert(alock->is_non_esc_obj(), "");
2196 } // EliminateNestedLocks
2197
2198 if (alock->is_non_esc_obj()) { // Lock is used for non escaping object
2199 // Look for all locks of this object and mark them and
2200 // corresponding BoxLock nodes as eliminated.
2201 Node* obj = alock->obj_node();
2202 for (uint j = 0; j < obj->outcnt(); j++) {
2203 Node* o = obj->raw_out(j);
2204 if (o->is_AbstractLock() &&
2205 o->as_AbstractLock()->obj_node()->eqv_uncast(obj)) {
2206 alock = o->as_AbstractLock();
2207 Node* box = alock->box_node();
2208 // Replace old box node with new eliminated box for all users
2209 // of the same object and mark related locks as eliminated.
2210 mark_eliminated_box(box, obj);
2211 }
2212 }
2213 }
2214 }
2215
2216 // we have determined that this lock/unlock can be eliminated, we simply
2217 // eliminate the node without expanding it.
2218 //
2219 // Note: The membar's associated with the lock/unlock are currently not
2220 // eliminated. This should be investigated as a future enhancement.
2221 //
2222 bool PhaseMacroExpand::eliminate_locking_node(AbstractLockNode *alock) {
2223
2224 if (!alock->is_eliminated()) {
2225 return false;
2226 }
2227 #ifdef ASSERT
2228 if (!alock->is_coarsened()) {
2229 // Check that new "eliminated" BoxLock node is created.
2230 BoxLockNode* oldbox = alock->box_node()->as_BoxLock();
2231 assert(oldbox->is_eliminated(), "should be done already");
2232 }
2233 #endif
2234
2235 alock->log_lock_optimization(C, "eliminate_lock");
2236
2237 #ifndef PRODUCT
2238 if (PrintEliminateLocks) {
2239 if (alock->is_Lock()) {
2240 tty->print_cr("++++ Eliminated: %d Lock", alock->_idx);
2241 } else {
2242 tty->print_cr("++++ Eliminated: %d Unlock", alock->_idx);
2243 }
2244 }
2245 #endif
2246
2247 Node* mem = alock->in(TypeFunc::Memory);
2248 Node* ctrl = alock->in(TypeFunc::Control);
2249
2250 extract_call_projections(alock);
2251 // There are 2 projections from the lock. The lock node will
2252 // be deleted when its last use is subsumed below.
2253 assert(alock->outcnt() == 2 &&
2254 _fallthroughproj != NULL &&
2255 _memproj_fallthrough != NULL,
2256 "Unexpected projections from Lock/Unlock");
2257
2258 Node* fallthroughproj = _fallthroughproj;
2259 Node* memproj_fallthrough = _memproj_fallthrough;
2260
2261 // The memory projection from a lock/unlock is RawMem
2262 // The input to a Lock is merged memory, so extract its RawMem input
2263 // (unless the MergeMem has been optimized away.)
2264 if (alock->is_Lock()) {
2265 // Seach for MemBarAcquireLock node and delete it also.
2266 MemBarNode* membar = fallthroughproj->unique_ctrl_out()->as_MemBar();
2267 assert(membar != NULL && membar->Opcode() == Op_MemBarAcquireLock, "");
2268 Node* ctrlproj = membar->proj_out(TypeFunc::Control);
2269 Node* memproj = membar->proj_out(TypeFunc::Memory);
2270 _igvn.replace_node(ctrlproj, fallthroughproj);
2271 _igvn.replace_node(memproj, memproj_fallthrough);
2272
2273 // Delete FastLock node also if this Lock node is unique user
2274 // (a loop peeling may clone a Lock node).
2275 Node* flock = alock->as_Lock()->fastlock_node();
2276 if (flock->outcnt() == 1) {
2277 assert(flock->unique_out() == alock, "sanity");
2278 _igvn.replace_node(flock, top());
2279 }
2280 }
2281
2282 // Seach for MemBarReleaseLock node and delete it also.
2283 if (alock->is_Unlock() && ctrl != NULL && ctrl->is_Proj() &&
2284 ctrl->in(0)->is_MemBar()) {
2285 MemBarNode* membar = ctrl->in(0)->as_MemBar();
2286 assert(membar->Opcode() == Op_MemBarReleaseLock &&
2287 mem->is_Proj() && membar == mem->in(0), "");
2288 _igvn.replace_node(fallthroughproj, ctrl);
2289 _igvn.replace_node(memproj_fallthrough, mem);
2290 fallthroughproj = ctrl;
2291 memproj_fallthrough = mem;
2292 ctrl = membar->in(TypeFunc::Control);
2293 mem = membar->in(TypeFunc::Memory);
2294 }
2295
2296 _igvn.replace_node(fallthroughproj, ctrl);
2297 _igvn.replace_node(memproj_fallthrough, mem);
2298 return true;
2299 }
2300
2301
2302 //------------------------------expand_lock_node----------------------
2303 void PhaseMacroExpand::expand_lock_node(LockNode *lock) {
2304
2305 Node* ctrl = lock->in(TypeFunc::Control);
2306 Node* mem = lock->in(TypeFunc::Memory);
2307 Node* obj = lock->obj_node();
2308 Node* box = lock->box_node();
2309 Node* flock = lock->fastlock_node();
2310
2311 assert(!box->as_BoxLock()->is_eliminated(), "sanity");
2312
2313 // Make the merge point
2314 Node *region;
2315 Node *mem_phi;
2316 Node *slow_path;
2317
2318 if (UseOptoBiasInlining) {
2319 /*
2320 * See the full description in MacroAssembler::biased_locking_enter().
2321 *
2322 * if( (mark_word & biased_lock_mask) == biased_lock_pattern ) {
2323 * // The object is biased.
2324 * proto_node = klass->prototype_header;
2325 * o_node = thread | proto_node;
2326 * x_node = o_node ^ mark_word;
2327 * if( (x_node & ~age_mask) == 0 ) { // Biased to the current thread ?
2328 * // Done.
2329 * } else {
2330 * if( (x_node & biased_lock_mask) != 0 ) {
2331 * // The klass's prototype header is no longer biased.
2332 * cas(&mark_word, mark_word, proto_node)
2333 * goto cas_lock;
2334 * } else {
2335 * // The klass's prototype header is still biased.
2336 * if( (x_node & epoch_mask) != 0 ) { // Expired epoch?
2337 * old = mark_word;
2338 * new = o_node;
2339 * } else {
2340 * // Different thread or anonymous biased.
2341 * old = mark_word & (epoch_mask | age_mask | biased_lock_mask);
2342 * new = thread | old;
2343 * }
2344 * // Try to rebias.
2345 * if( cas(&mark_word, old, new) == 0 ) {
2346 * // Done.
2347 * } else {
2348 * goto slow_path; // Failed.
2349 * }
2350 * }
2351 * }
2352 * } else {
2353 * // The object is not biased.
2354 * cas_lock:
2355 * if( FastLock(obj) == 0 ) {
2356 * // Done.
2357 * } else {
2358 * slow_path:
2359 * OptoRuntime::complete_monitor_locking_Java(obj);
2360 * }
2361 * }
2362 */
2363
2364 region = new RegionNode(5);
2365 // create a Phi for the memory state
2366 mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2367
2368 Node* fast_lock_region = new RegionNode(3);
2369 Node* fast_lock_mem_phi = new PhiNode( fast_lock_region, Type::MEMORY, TypeRawPtr::BOTTOM);
2370
2371 // First, check mark word for the biased lock pattern.
2372 Node* mark_node = make_load(ctrl, mem, obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type());
2373
2374 // Get fast path - mark word has the biased lock pattern.
2375 ctrl = opt_bits_test(ctrl, fast_lock_region, 1, mark_node,
2376 markOopDesc::biased_lock_mask_in_place,
2377 markOopDesc::biased_lock_pattern, true);
2378 // fast_lock_region->in(1) is set to slow path.
2379 fast_lock_mem_phi->init_req(1, mem);
2380
2381 // Now check that the lock is biased to the current thread and has
2382 // the same epoch and bias as Klass::_prototype_header.
2383
2384 // Special-case a fresh allocation to avoid building nodes:
2385 Node* klass_node = AllocateNode::Ideal_klass(obj, &_igvn);
2386 if (klass_node == NULL) {
2387 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes());
2388 klass_node = transform_later(LoadKlassNode::make(_igvn, NULL, mem, k_adr, _igvn.type(k_adr)->is_ptr()));
2389 #ifdef _LP64
2390 if (UseCompressedClassPointers && klass_node->is_DecodeNKlass()) {
2391 assert(klass_node->in(1)->Opcode() == Op_LoadNKlass, "sanity");
2392 klass_node->in(1)->init_req(0, ctrl);
2393 } else
2394 #endif
2395 klass_node->init_req(0, ctrl);
2396 }
2397 Node *proto_node = make_load(ctrl, mem, klass_node, in_bytes(Klass::prototype_header_offset()), TypeX_X, TypeX_X->basic_type());
2398
2399 Node* thread = transform_later(new ThreadLocalNode());
2400 Node* cast_thread = transform_later(new CastP2XNode(ctrl, thread));
2401 Node* o_node = transform_later(new OrXNode(cast_thread, proto_node));
2402 Node* x_node = transform_later(new XorXNode(o_node, mark_node));
2403
2404 // Get slow path - mark word does NOT match the value.
2405 Node* not_biased_ctrl = opt_bits_test(ctrl, region, 3, x_node,
2406 (~markOopDesc::age_mask_in_place), 0);
2407 // region->in(3) is set to fast path - the object is biased to the current thread.
2408 mem_phi->init_req(3, mem);
2409
2410
2411 // Mark word does NOT match the value (thread | Klass::_prototype_header).
2412
2413
2414 // First, check biased pattern.
2415 // Get fast path - _prototype_header has the same biased lock pattern.
2416 ctrl = opt_bits_test(not_biased_ctrl, fast_lock_region, 2, x_node,
2417 markOopDesc::biased_lock_mask_in_place, 0, true);
2418
2419 not_biased_ctrl = fast_lock_region->in(2); // Slow path
2420 // fast_lock_region->in(2) - the prototype header is no longer biased
2421 // and we have to revoke the bias on this object.
2422 // We are going to try to reset the mark of this object to the prototype
2423 // value and fall through to the CAS-based locking scheme.
2424 Node* adr = basic_plus_adr(obj, oopDesc::mark_offset_in_bytes());
2425 Node* cas = new StoreXConditionalNode(not_biased_ctrl, mem, adr,
2426 proto_node, mark_node);
2427 transform_later(cas);
2428 Node* proj = transform_later(new SCMemProjNode(cas));
2429 fast_lock_mem_phi->init_req(2, proj);
2430
2431
2432 // Second, check epoch bits.
2433 Node* rebiased_region = new RegionNode(3);
2434 Node* old_phi = new PhiNode( rebiased_region, TypeX_X);
2435 Node* new_phi = new PhiNode( rebiased_region, TypeX_X);
2436
2437 // Get slow path - mark word does NOT match epoch bits.
2438 Node* epoch_ctrl = opt_bits_test(ctrl, rebiased_region, 1, x_node,
2439 markOopDesc::epoch_mask_in_place, 0);
2440 // The epoch of the current bias is not valid, attempt to rebias the object
2441 // toward the current thread.
2442 rebiased_region->init_req(2, epoch_ctrl);
2443 old_phi->init_req(2, mark_node);
2444 new_phi->init_req(2, o_node);
2445
2446 // rebiased_region->in(1) is set to fast path.
2447 // The epoch of the current bias is still valid but we know
2448 // nothing about the owner; it might be set or it might be clear.
2449 Node* cmask = MakeConX(markOopDesc::biased_lock_mask_in_place |
2450 markOopDesc::age_mask_in_place |
2451 markOopDesc::epoch_mask_in_place);
2452 Node* old = transform_later(new AndXNode(mark_node, cmask));
2453 cast_thread = transform_later(new CastP2XNode(ctrl, thread));
2454 Node* new_mark = transform_later(new OrXNode(cast_thread, old));
2455 old_phi->init_req(1, old);
2456 new_phi->init_req(1, new_mark);
2457
2458 transform_later(rebiased_region);
2459 transform_later(old_phi);
2460 transform_later(new_phi);
2461
2462 // Try to acquire the bias of the object using an atomic operation.
2463 // If this fails we will go in to the runtime to revoke the object's bias.
2464 cas = new StoreXConditionalNode(rebiased_region, mem, adr, new_phi, old_phi);
2465 transform_later(cas);
2466 proj = transform_later(new SCMemProjNode(cas));
2467
2468 // Get slow path - Failed to CAS.
2469 not_biased_ctrl = opt_bits_test(rebiased_region, region, 4, cas, 0, 0);
2470 mem_phi->init_req(4, proj);
2471 // region->in(4) is set to fast path - the object is rebiased to the current thread.
2472
2473 // Failed to CAS.
2474 slow_path = new RegionNode(3);
2475 Node *slow_mem = new PhiNode( slow_path, Type::MEMORY, TypeRawPtr::BOTTOM);
2476
2477 slow_path->init_req(1, not_biased_ctrl); // Capture slow-control
2478 slow_mem->init_req(1, proj);
2479
2480 // Call CAS-based locking scheme (FastLock node).
2481
2482 transform_later(fast_lock_region);
2483 transform_later(fast_lock_mem_phi);
2484
2485 // Get slow path - FastLock failed to lock the object.
2486 ctrl = opt_bits_test(fast_lock_region, region, 2, flock, 0, 0);
2487 mem_phi->init_req(2, fast_lock_mem_phi);
2488 // region->in(2) is set to fast path - the object is locked to the current thread.
2489
2490 slow_path->init_req(2, ctrl); // Capture slow-control
2491 slow_mem->init_req(2, fast_lock_mem_phi);
2492
2493 transform_later(slow_path);
2494 transform_later(slow_mem);
2495 // Reset lock's memory edge.
2496 lock->set_req(TypeFunc::Memory, slow_mem);
2497
2498 } else {
2499 region = new RegionNode(3);
2500 // create a Phi for the memory state
2501 mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2502
2503 // Optimize test; set region slot 2
2504 slow_path = opt_bits_test(ctrl, region, 2, flock, 0, 0);
2505 mem_phi->init_req(2, mem);
2506 }
2507
2508 // Make slow path call
2509 CallNode *call = make_slow_call((CallNode *) lock, OptoRuntime::complete_monitor_enter_Type(),
2510 OptoRuntime::complete_monitor_locking_Java(), NULL, slow_path,
2511 obj, box, NULL);
2512
2513 extract_call_projections(call);
2514
2515 // Slow path can only throw asynchronous exceptions, which are always
2516 // de-opted. So the compiler thinks the slow-call can never throw an
2517 // exception. If it DOES throw an exception we would need the debug
2518 // info removed first (since if it throws there is no monitor).
2519 assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL &&
2520 _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock");
2521
2522 // Capture slow path
2523 // disconnect fall-through projection from call and create a new one
2524 // hook up users of fall-through projection to region
2525 Node *slow_ctrl = _fallthroughproj->clone();
2526 transform_later(slow_ctrl);
2527 _igvn.hash_delete(_fallthroughproj);
2528 _fallthroughproj->disconnect_inputs(NULL, C);
2529 region->init_req(1, slow_ctrl);
2530 // region inputs are now complete
2531 transform_later(region);
2532 _igvn.replace_node(_fallthroughproj, region);
2533
2534 Node *memproj = transform_later(new ProjNode(call, TypeFunc::Memory));
2535 mem_phi->init_req(1, memproj );
2536 transform_later(mem_phi);
2537 _igvn.replace_node(_memproj_fallthrough, mem_phi);
2538 }
2539
2540 //------------------------------expand_unlock_node----------------------
2541 void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) {
2542
2543 Node* ctrl = unlock->in(TypeFunc::Control);
2544 Node* mem = unlock->in(TypeFunc::Memory);
2545 Node* obj = unlock->obj_node();
2546 Node* box = unlock->box_node();
2547
2548 assert(!box->as_BoxLock()->is_eliminated(), "sanity");
2549
2550 // No need for a null check on unlock
2551
2552 // Make the merge point
2553 Node *region;
2554 Node *mem_phi;
2555
2556 if (UseOptoBiasInlining) {
2557 // Check for biased locking unlock case, which is a no-op.
2558 // See the full description in MacroAssembler::biased_locking_exit().
2559 region = new RegionNode(4);
2560 // create a Phi for the memory state
2561 mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2562 mem_phi->init_req(3, mem);
2563
2564 Node* mark_node = make_load(ctrl, mem, obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type());
2565 ctrl = opt_bits_test(ctrl, region, 3, mark_node,
2566 markOopDesc::biased_lock_mask_in_place,
2567 markOopDesc::biased_lock_pattern);
2568 } else {
2569 region = new RegionNode(3);
2570 // create a Phi for the memory state
2571 mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2572 }
2573
2574 FastUnlockNode *funlock = new FastUnlockNode( ctrl, obj, box );
2575 funlock = transform_later( funlock )->as_FastUnlock();
2576 // Optimize test; set region slot 2
2577 Node *slow_path = opt_bits_test(ctrl, region, 2, funlock, 0, 0);
2578 Node *thread = transform_later(new ThreadLocalNode());
2579
2580 CallNode *call = make_slow_call((CallNode *) unlock, OptoRuntime::complete_monitor_exit_Type(),
2581 CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C),
2582 "complete_monitor_unlocking_C", slow_path, obj, box, thread);
2583
2584 extract_call_projections(call);
2585
2586 assert ( _ioproj_fallthrough == NULL && _ioproj_catchall == NULL &&
2587 _memproj_catchall == NULL && _catchallcatchproj == NULL, "Unexpected projection from Lock");
2588
2589 // No exceptions for unlocking
2590 // Capture slow path
2591 // disconnect fall-through projection from call and create a new one
2592 // hook up users of fall-through projection to region
2593 Node *slow_ctrl = _fallthroughproj->clone();
2594 transform_later(slow_ctrl);
2595 _igvn.hash_delete(_fallthroughproj);
2596 _fallthroughproj->disconnect_inputs(NULL, C);
2597 region->init_req(1, slow_ctrl);
2598 // region inputs are now complete
2599 transform_later(region);
2600 _igvn.replace_node(_fallthroughproj, region);
2601
2602 Node *memproj = transform_later(new ProjNode(call, TypeFunc::Memory) );
2603 mem_phi->init_req(1, memproj );
2604 mem_phi->init_req(2, mem);
2605 transform_later(mem_phi);
2606 _igvn.replace_node(_memproj_fallthrough, mem_phi);
2607 }
2608
2609 //---------------------------eliminate_macro_nodes----------------------
2610 // Eliminate scalar replaced allocations and associated locks.
2611 void PhaseMacroExpand::eliminate_macro_nodes() {
2612 if (C->macro_count() == 0)
2613 return;
2614
2615 // First, attempt to eliminate locks
2616 int cnt = C->macro_count();
2617 for (int i=0; i < cnt; i++) {
2618 Node *n = C->macro_node(i);
2619 if (n->is_AbstractLock()) { // Lock and Unlock nodes
2620 // Before elimination mark all associated (same box and obj)
2621 // lock and unlock nodes.
2622 mark_eliminated_locking_nodes(n->as_AbstractLock());
2623 }
2624 }
2625 bool progress = true;
2626 while (progress) {
2627 progress = false;
2628 for (int i = C->macro_count(); i > 0; i--) {
2629 Node * n = C->macro_node(i-1);
2630 bool success = false;
2631 debug_only(int old_macro_count = C->macro_count(););
2632 if (n->is_AbstractLock()) {
2633 success = eliminate_locking_node(n->as_AbstractLock());
2634 }
2635 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count");
2636 progress = progress || success;
2637 }
2638 }
2639 // Next, attempt to eliminate allocations
2640 _has_locks = false;
2641 progress = true;
2642 while (progress) {
2643 progress = false;
2644 for (int i = C->macro_count(); i > 0; i--) {
2645 Node * n = C->macro_node(i-1);
2646 bool success = false;
2647 debug_only(int old_macro_count = C->macro_count(););
2648 switch (n->class_id()) {
2649 case Node::Class_Allocate:
2650 case Node::Class_AllocateArray:
2651 success = eliminate_allocate_node(n->as_Allocate());
2652 break;
2653 case Node::Class_CallStaticJava:
2654 success = eliminate_boxing_node(n->as_CallStaticJava());
2655 break;
2656 case Node::Class_Lock:
2657 case Node::Class_Unlock:
2658 assert(!n->as_AbstractLock()->is_eliminated(), "sanity");
2659 _has_locks = true;
2660 break;
2661 case Node::Class_ArrayCopy:
2662 break;
2663 default:
2664 assert(n->Opcode() == Op_LoopLimit ||
2665 n->Opcode() == Op_Opaque1 ||
2666 n->Opcode() == Op_Opaque2 ||
2667 n->Opcode() == Op_Opaque3 ||
2668 n->Opcode() == Op_Opaque4, "unknown node type in macro list");
2669 }
2670 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count");
2671 progress = progress || success;
2672 }
2673 }
2674 }
2675
2676 //------------------------------expand_macro_nodes----------------------
2677 // Returns true if a failure occurred.
2678 bool PhaseMacroExpand::expand_macro_nodes() {
2679 // Last attempt to eliminate macro nodes.
2680 eliminate_macro_nodes();
2681
2682 // Make sure expansion will not cause node limit to be exceeded.
2683 // Worst case is a macro node gets expanded into about 200 nodes.
2684 // Allow 50% more for optimization.
2685 if (C->check_node_count(C->macro_count() * 300, "out of nodes before macro expansion" ) )
2686 return true;
2687
2688 // Eliminate Opaque and LoopLimit nodes. Do it after all loop optimizations.
2689 bool progress = true;
2690 while (progress) {
2691 progress = false;
2692 for (int i = C->macro_count(); i > 0; i--) {
2693 Node * n = C->macro_node(i-1);
2694 bool success = false;
2695 debug_only(int old_macro_count = C->macro_count(););
2696 if (n->Opcode() == Op_LoopLimit) {
2697 // Remove it from macro list and put on IGVN worklist to optimize.
2698 C->remove_macro_node(n);
2699 _igvn._worklist.push(n);
2700 success = true;
2701 } else if (n->Opcode() == Op_CallStaticJava) {
2702 // Remove it from macro list and put on IGVN worklist to optimize.
2703 C->remove_macro_node(n);
2704 _igvn._worklist.push(n);
2705 success = true;
2706 } else if (n->Opcode() == Op_Opaque1 || n->Opcode() == Op_Opaque2) {
2707 _igvn.replace_node(n, n->in(1));
2708 success = true;
2709 #if INCLUDE_RTM_OPT
2710 } else if ((n->Opcode() == Op_Opaque3) && ((Opaque3Node*)n)->rtm_opt()) {
2711 assert(C->profile_rtm(), "should be used only in rtm deoptimization code");
2712 assert((n->outcnt() == 1) && n->unique_out()->is_Cmp(), "");
2713 Node* cmp = n->unique_out();
2714 #ifdef ASSERT
2715 // Validate graph.
2716 assert((cmp->outcnt() == 1) && cmp->unique_out()->is_Bool(), "");
2717 BoolNode* bol = cmp->unique_out()->as_Bool();
2718 assert((bol->outcnt() == 1) && bol->unique_out()->is_If() &&
2719 (bol->_test._test == BoolTest::ne), "");
2720 IfNode* ifn = bol->unique_out()->as_If();
2721 assert((ifn->outcnt() == 2) &&
2722 ifn->proj_out(1)->is_uncommon_trap_proj(Deoptimization::Reason_rtm_state_change) != NULL, "");
2723 #endif
2724 Node* repl = n->in(1);
2725 if (!_has_locks) {
2726 // Remove RTM state check if there are no locks in the code.
2727 // Replace input to compare the same value.
2728 repl = (cmp->in(1) == n) ? cmp->in(2) : cmp->in(1);
2729 }
2730 _igvn.replace_node(n, repl);
2731 success = true;
2732 #endif
2733 } else if (n->Opcode() == Op_Opaque4) {
2734 _igvn.replace_node(n, n->in(2));
2735 success = true;
2736 }
2737 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count");
2738 progress = progress || success;
2739 }
2740 }
2741
2742 // expand arraycopy "macro" nodes first
2743 // For ReduceBulkZeroing, we must first process all arraycopy nodes
2744 // before the allocate nodes are expanded.
2745 int macro_idx = C->macro_count() - 1;
2746 while (macro_idx >= 0) {
2747 Node * n = C->macro_node(macro_idx);
2748 assert(n->is_macro(), "only macro nodes expected here");
2749 if (_igvn.type(n) == Type::TOP || n->in(0)->is_top() ) {
2750 // node is unreachable, so don't try to expand it
2751 C->remove_macro_node(n);
2752 } else if (n->is_ArrayCopy()){
2753 int macro_count = C->macro_count();
2754 expand_arraycopy_node(n->as_ArrayCopy());
2755 assert(C->macro_count() < macro_count, "must have deleted a node from macro list");
2756 }
2757 if (C->failing()) return true;
2758 macro_idx --;
2759 }
2760
2761 // expand "macro" nodes
2762 // nodes are removed from the macro list as they are processed
2763 while (C->macro_count() > 0) {
2764 int macro_count = C->macro_count();
2765 Node * n = C->macro_node(macro_count-1);
2766 assert(n->is_macro(), "only macro nodes expected here");
2767 if (_igvn.type(n) == Type::TOP || n->in(0)->is_top() ) {
2768 // node is unreachable, so don't try to expand it
2769 C->remove_macro_node(n);
2770 continue;
2771 }
2772 switch (n->class_id()) {
2773 case Node::Class_Allocate:
2774 expand_allocate(n->as_Allocate());
2775 break;
2776 case Node::Class_AllocateArray:
2777 expand_allocate_array(n->as_AllocateArray());
2778 break;
2779 case Node::Class_Lock:
2780 expand_lock_node(n->as_Lock());
2781 break;
2782 case Node::Class_Unlock:
2783 expand_unlock_node(n->as_Unlock());
2784 break;
2785 default:
2786 assert(false, "unknown node type in macro list");
2787 }
2788 assert(C->macro_count() < macro_count, "must have deleted a node from macro list");
2789 if (C->failing()) return true;
2790 }
2791
2792 _igvn.set_delay_transform(false);
2793 _igvn.optimize();
2794 if (C->failing()) return true;
2795 return false;
2796 }