Mercurial > hg > graal-compiler
annotate src/share/vm/opto/idealKit.cpp @ 1468:e4cd5d2de7e1
Changes to sync with CRI changes.
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 19 Nov 2010 00:26:51 +0100 |
parents | a1423fe86a18 |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
948 | 2 * Copyright 2005-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_idealKit.cpp.incl" | |
27 | |
28 // Static initialization | |
29 | |
30 // This declares the position where vars are kept in the cvstate | |
31 // For some degree of consistency we use the TypeFunc enum to | |
32 // soak up spots in the inputs even though we only use early Control | |
33 // and Memory slots. (So far.) | |
34 const uint IdealKit::first_var = TypeFunc::Parms + 1; | |
35 | |
36 //----------------------------IdealKit----------------------------------------- | |
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37 IdealKit::IdealKit(PhaseGVN &gvn, Node* control, Node* mem, bool delay_all_transforms, bool has_declarations) : |
0 | 38 _gvn(gvn), C(gvn.C) { |
39 _initial_ctrl = control; | |
40 _initial_memory = mem; | |
41 _delay_all_transforms = delay_all_transforms; | |
42 _var_ct = 0; | |
43 _cvstate = NULL; | |
44 // We can go memory state free or else we need the entire memory state | |
45 assert(mem == NULL || mem->Opcode() == Op_MergeMem, "memory must be pre-split"); | |
46 int init_size = 5; | |
47 _pending_cvstates = new (C->node_arena()) GrowableArray<Node*>(C->node_arena(), init_size, 0, 0); | |
48 _delay_transform = new (C->node_arena()) GrowableArray<Node*>(C->node_arena(), init_size, 0, 0); | |
49 DEBUG_ONLY(_state = new (C->node_arena()) GrowableArray<int>(C->node_arena(), init_size, 0, 0)); | |
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50 if (!has_declarations) { |
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51 declarations_done(); |
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52 } |
0 | 53 } |
54 | |
55 //-------------------------------if_then------------------------------------- | |
56 // Create: if(left relop right) | |
57 // / \ | |
58 // iffalse iftrue | |
59 // Push the iffalse cvstate onto the stack. The iftrue becomes the current cvstate. | |
60 void IdealKit::if_then(Node* left, BoolTest::mask relop, | |
61 Node* right, float prob, float cnt, bool push_new_state) { | |
62 assert((state() & (BlockS|LoopS|IfThenS|ElseS)), "bad state for new If"); | |
63 Node* bol; | |
64 if (left->bottom_type()->isa_ptr() == NULL) { | |
65 if (left->bottom_type()->isa_int() != NULL) { | |
66 bol = Bool(CmpI(left, right), relop); | |
67 } else { | |
68 assert(left->bottom_type()->isa_long() != NULL, "what else?"); | |
69 bol = Bool(CmpL(left, right), relop); | |
70 } | |
71 | |
72 } else { | |
73 bol = Bool(CmpP(left, right), relop); | |
74 } | |
75 // Delay gvn.tranform on if-nodes until construction is finished | |
76 // to prevent a constant bool input from discarding a control output. | |
77 IfNode* iff = delay_transform(new (C, 2) IfNode(ctrl(), bol, prob, cnt))->as_If(); | |
78 Node* then = IfTrue(iff); | |
79 Node* elsen = IfFalse(iff); | |
80 Node* else_cvstate = copy_cvstate(); | |
81 else_cvstate->set_req(TypeFunc::Control, elsen); | |
82 _pending_cvstates->push(else_cvstate); | |
83 DEBUG_ONLY(if (push_new_state) _state->push(IfThenS)); | |
84 set_ctrl(then); | |
85 } | |
86 | |
87 //-------------------------------else_------------------------------------- | |
88 // Pop the else cvstate off the stack, and push the (current) then cvstate. | |
89 // The else cvstate becomes the current cvstate. | |
90 void IdealKit::else_() { | |
91 assert(state() == IfThenS, "bad state for new Else"); | |
92 Node* else_cvstate = _pending_cvstates->pop(); | |
93 DEBUG_ONLY(_state->pop()); | |
94 // save current (then) cvstate for later use at endif | |
95 _pending_cvstates->push(_cvstate); | |
96 DEBUG_ONLY(_state->push(ElseS)); | |
97 _cvstate = else_cvstate; | |
98 } | |
99 | |
100 //-------------------------------end_if------------------------------------- | |
101 // Merge the "then" and "else" cvstates. | |
102 // | |
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103 // The if_then() pushed a copy of the current state for later use |
0 | 104 // as the initial state for a future "else" clause. The |
105 // current state then became the initial state for the | |
106 // then clause. If an "else" clause was encountered, it will | |
107 // pop the top state and use it for it's initial state. | |
108 // It will also push the current state (the state at the end of | |
109 // the "then" clause) for latter use at the end_if. | |
110 // | |
111 // At the endif, the states are: | |
112 // 1) else exists a) current state is end of "else" clause | |
113 // b) top stack state is end of "then" clause | |
114 // | |
115 // 2) no else: a) current state is end of "then" clause | |
116 // b) top stack state is from the "if_then" which | |
117 // would have been the initial state of the else. | |
118 // | |
119 // Merging the states is accomplished by: | |
120 // 1) make a label for the merge | |
121 // 2) terminate the current state with a goto to the label | |
122 // 3) pop the top state from the stack and make it the | |
123 // current state | |
124 // 4) bind the label at the current state. Binding a label | |
125 // terminates the current state with a goto to the | |
126 // label and makes the label's state the current state. | |
127 // | |
128 void IdealKit::end_if() { | |
129 assert(state() & (IfThenS|ElseS), "bad state for new Endif"); | |
130 Node* lab = make_label(1); | |
131 | |
132 // Node* join_state = _pending_cvstates->pop(); | |
133 /* merging, join */ | |
134 goto_(lab); | |
135 _cvstate = _pending_cvstates->pop(); | |
136 | |
137 bind(lab); | |
138 DEBUG_ONLY(_state->pop()); | |
139 } | |
140 | |
141 //-------------------------------loop------------------------------------- | |
142 // Create the loop head portion (*) of: | |
143 // * iv = init | |
144 // * top: (region node) | |
145 // * if (iv relop limit) { | |
146 // loop body | |
147 // i = i + 1 | |
148 // goto top | |
149 // * } else // exits loop | |
150 // | |
151 // Pushes the loop top cvstate first, then the else (loop exit) cvstate | |
152 // onto the stack. | |
153 void IdealKit::loop(IdealVariable& iv, Node* init, BoolTest::mask relop, Node* limit, float prob, float cnt) { | |
154 assert((state() & (BlockS|LoopS|IfThenS|ElseS)), "bad state for new loop"); | |
155 set(iv, init); | |
156 Node* head = make_label(1); | |
157 bind(head); | |
158 _pending_cvstates->push(head); // push for use at end_loop | |
159 _cvstate = copy_cvstate(); | |
160 if_then(value(iv), relop, limit, prob, cnt, false /* no new state */); | |
161 DEBUG_ONLY(_state->push(LoopS)); | |
162 assert(ctrl()->is_IfTrue(), "true branch stays in loop"); | |
163 assert(_pending_cvstates->top()->in(TypeFunc::Control)->is_IfFalse(), "false branch exits loop"); | |
164 } | |
165 | |
166 //-------------------------------end_loop------------------------------------- | |
167 // Creates the goto top label. | |
168 // Expects the else (loop exit) cvstate to be on top of the | |
169 // stack, and the loop top cvstate to be 2nd. | |
170 void IdealKit::end_loop() { | |
171 assert((state() == LoopS), "bad state for new end_loop"); | |
172 Node* exit = _pending_cvstates->pop(); | |
173 Node* head = _pending_cvstates->pop(); | |
174 goto_(head); | |
175 clear(head); | |
176 DEBUG_ONLY(_state->pop()); | |
177 _cvstate = exit; | |
178 } | |
179 | |
180 //-------------------------------make_label------------------------------------- | |
181 // Creates a label. The number of goto's | |
182 // must be specified (which should be 1 less than | |
183 // the number of precedessors.) | |
184 Node* IdealKit::make_label(int goto_ct) { | |
185 assert(_cvstate != NULL, "must declare variables before labels"); | |
186 Node* lab = new_cvstate(); | |
187 int sz = 1 + goto_ct + 1 /* fall thru */; | |
188 Node* reg = delay_transform(new (C, sz) RegionNode(sz)); | |
189 lab->init_req(TypeFunc::Control, reg); | |
190 return lab; | |
191 } | |
192 | |
193 //-------------------------------bind------------------------------------- | |
194 // Bind a label at the current cvstate by simulating | |
195 // a goto to the label. | |
196 void IdealKit::bind(Node* lab) { | |
197 goto_(lab, true /* bind */); | |
198 _cvstate = lab; | |
199 } | |
200 | |
201 //-------------------------------goto_------------------------------------- | |
202 // Make the current cvstate a predecessor of the label, | |
203 // creating phi's to merge values. If bind is true and | |
204 // this is not the last control edge, then ensure that | |
205 // all live values have phis created. Used to create phis | |
206 // at loop-top regions. | |
207 void IdealKit::goto_(Node* lab, bool bind) { | |
208 Node* reg = lab->in(TypeFunc::Control); | |
209 // find next empty slot in region | |
210 uint slot = 1; | |
211 while (slot < reg->req() && reg->in(slot) != NULL) slot++; | |
212 assert(slot < reg->req(), "too many gotos"); | |
213 // If this is last predecessor, then don't force phi creation | |
214 if (slot == reg->req() - 1) bind = false; | |
215 reg->init_req(slot, ctrl()); | |
216 assert(first_var + _var_ct == _cvstate->req(), "bad _cvstate size"); | |
217 for (uint i = first_var; i < _cvstate->req(); i++) { | |
218 | |
219 // l is the value of var reaching the label. Could be a single value | |
220 // reaching the label, or a phi that merges multiples values reaching | |
221 // the label. The latter is true if the label's input: in(..) is | |
222 // a phi whose control input is the region node for the label. | |
223 | |
224 Node* l = lab->in(i); | |
225 // Get the current value of the var | |
226 Node* m = _cvstate->in(i); | |
227 // If the var went unused no need for a phi | |
228 if (m == NULL) { | |
229 continue; | |
230 } else if (l == NULL || m == l) { | |
231 // Only one unique value "m" is known to reach this label so a phi | |
232 // is not yet necessary unless: | |
233 // the label is being bound and all predecessors have not been seen, | |
234 // in which case "bind" will be true. | |
235 if (bind) { | |
236 m = promote_to_phi(m, reg); | |
237 } | |
238 // Record the phi/value used for this var in the label's cvstate | |
239 lab->set_req(i, m); | |
240 } else { | |
241 // More than one value for the variable reaches this label so | |
242 // a create a phi if one does not already exist. | |
243 if (!was_promoted_to_phi(l, reg)) { | |
244 l = promote_to_phi(l, reg); | |
245 lab->set_req(i, l); | |
246 } | |
247 // Record in the phi, the var's value from the current state | |
248 l->set_req(slot, m); | |
249 } | |
250 } | |
251 do_memory_merge(_cvstate, lab); | |
252 stop(); | |
253 } | |
254 | |
255 //-----------------------------promote_to_phi----------------------------------- | |
256 Node* IdealKit::promote_to_phi(Node* n, Node* reg) { | |
257 assert(!was_promoted_to_phi(n, reg), "n already promoted to phi on this region"); | |
258 // Get a conservative type for the phi | |
259 const BasicType bt = n->bottom_type()->basic_type(); | |
260 const Type* ct = Type::get_const_basic_type(bt); | |
261 return delay_transform(PhiNode::make(reg, n, ct)); | |
262 } | |
263 | |
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264 //-----------------------------declarations_done------------------------------- |
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265 void IdealKit::declarations_done() { |
0 | 266 _cvstate = new_cvstate(); // initialize current cvstate |
267 set_ctrl(_initial_ctrl); // initialize control in current cvstate | |
268 set_all_memory(_initial_memory);// initialize memory in current cvstate | |
269 DEBUG_ONLY(_state->push(BlockS)); | |
270 } | |
271 | |
272 //-----------------------------transform----------------------------------- | |
273 Node* IdealKit::transform(Node* n) { | |
274 if (_delay_all_transforms) { | |
275 return delay_transform(n); | |
276 } else { | |
277 return gvn().transform(n); | |
278 } | |
279 } | |
280 | |
281 //-----------------------------delay_transform----------------------------------- | |
282 Node* IdealKit::delay_transform(Node* n) { | |
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283 if (!gvn().is_IterGVN() || !gvn().is_IterGVN()->delay_transform()) { |
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284 gvn().set_type(n, n->bottom_type()); |
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285 } |
0 | 286 _delay_transform->push(n); |
287 return n; | |
288 } | |
289 | |
290 //-----------------------------new_cvstate----------------------------------- | |
291 Node* IdealKit::new_cvstate() { | |
292 uint sz = _var_ct + first_var; | |
293 return new (C, sz) Node(sz); | |
294 } | |
295 | |
296 //-----------------------------copy_cvstate----------------------------------- | |
297 Node* IdealKit::copy_cvstate() { | |
298 Node* ns = new_cvstate(); | |
299 for (uint i = 0; i < ns->req(); i++) ns->init_req(i, _cvstate->in(i)); | |
300 // We must clone memory since it will be updated as we do stores. | |
301 ns->set_req(TypeFunc::Memory, MergeMemNode::make(C, ns->in(TypeFunc::Memory))); | |
302 return ns; | |
303 } | |
304 | |
305 //-----------------------------clear----------------------------------- | |
306 void IdealKit::clear(Node* m) { | |
307 for (uint i = 0; i < m->req(); i++) m->set_req(i, NULL); | |
308 } | |
309 | |
310 //-----------------------------drain_delay_transform---------------------------- | |
311 void IdealKit::drain_delay_transform() { | |
312 while (_delay_transform->length() > 0) { | |
313 Node* n = _delay_transform->pop(); | |
314 gvn().transform(n); | |
315 if (!gvn().is_IterGVN()) { | |
316 C->record_for_igvn(n); | |
317 } | |
318 } | |
319 } | |
320 | |
321 //-----------------------------IdealVariable---------------------------- | |
322 IdealVariable::IdealVariable(IdealKit &k) { | |
323 k.declare(this); | |
324 } | |
325 | |
326 Node* IdealKit::memory(uint alias_idx) { | |
327 MergeMemNode* mem = merged_memory(); | |
328 Node* p = mem->memory_at(alias_idx); | |
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329 if (!gvn().is_IterGVN() || !gvn().is_IterGVN()->delay_transform()) { |
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330 _gvn.set_type(p, Type::MEMORY); // must be mapped |
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331 } |
0 | 332 return p; |
333 } | |
334 | |
335 void IdealKit::set_memory(Node* mem, uint alias_idx) { | |
336 merged_memory()->set_memory_at(alias_idx, mem); | |
337 } | |
338 | |
339 //----------------------------- make_load ---------------------------- | |
340 Node* IdealKit::load(Node* ctl, | |
341 Node* adr, | |
342 const Type* t, | |
343 BasicType bt, | |
344 int adr_idx, | |
345 bool require_atomic_access) { | |
346 | |
347 assert(adr_idx != Compile::AliasIdxTop, "use other make_load factory" ); | |
348 const TypePtr* adr_type = NULL; // debug-mode-only argument | |
349 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
350 Node* mem = memory(adr_idx); | |
351 Node* ld; | |
352 if (require_atomic_access && bt == T_LONG) { | |
353 ld = LoadLNode::make_atomic(C, ctl, mem, adr, adr_type, t); | |
354 } else { | |
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355 ld = LoadNode::make(_gvn, ctl, mem, adr, adr_type, t, bt); |
0 | 356 } |
357 return transform(ld); | |
358 } | |
359 | |
360 Node* IdealKit::store(Node* ctl, Node* adr, Node *val, BasicType bt, | |
361 int adr_idx, | |
362 bool require_atomic_access) { | |
363 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); | |
364 const TypePtr* adr_type = NULL; | |
365 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
366 Node *mem = memory(adr_idx); | |
367 Node* st; | |
368 if (require_atomic_access && bt == T_LONG) { | |
369 st = StoreLNode::make_atomic(C, ctl, mem, adr, adr_type, val); | |
370 } else { | |
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371 st = StoreNode::make(_gvn, ctl, mem, adr, adr_type, val, bt); |
0 | 372 } |
373 st = transform(st); | |
374 set_memory(st, adr_idx); | |
375 | |
376 return st; | |
377 } | |
378 | |
379 // Card mark store. Must be ordered so that it will come after the store of | |
380 // the oop. | |
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381 Node* IdealKit::storeCM(Node* ctl, Node* adr, Node *val, Node* oop_store, int oop_adr_idx, |
0 | 382 BasicType bt, |
383 int adr_idx) { | |
384 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); | |
385 const TypePtr* adr_type = NULL; | |
386 debug_only(adr_type = C->get_adr_type(adr_idx)); | |
387 Node *mem = memory(adr_idx); | |
388 | |
389 // Add required edge to oop_store, optimizer does not support precedence edges. | |
390 // Convert required edge to precedence edge before allocation. | |
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391 Node* st = new (C, 5) StoreCMNode(ctl, mem, adr, adr_type, val, oop_store, oop_adr_idx); |
0 | 392 |
393 st = transform(st); | |
394 set_memory(st, adr_idx); | |
395 | |
396 return st; | |
397 } | |
398 | |
399 //---------------------------- do_memory_merge -------------------------------- | |
400 // The memory from one merging cvstate needs to be merged with the memory for another | |
401 // join cvstate. If the join cvstate doesn't have a merged memory yet then we | |
402 // can just copy the state from the merging cvstate | |
403 | |
404 // Merge one slow path into the rest of memory. | |
405 void IdealKit::do_memory_merge(Node* merging, Node* join) { | |
406 | |
407 // Get the region for the join state | |
408 Node* join_region = join->in(TypeFunc::Control); | |
409 assert(join_region != NULL, "join region must exist"); | |
410 if (join->in(TypeFunc::Memory) == NULL ) { | |
411 join->set_req(TypeFunc::Memory, merging->in(TypeFunc::Memory)); | |
412 return; | |
413 } | |
414 | |
415 // The control flow for merging must have already been attached to the join region | |
416 // we need its index for the phis. | |
417 uint slot; | |
418 for (slot = 1; slot < join_region->req() ; slot ++ ) { | |
419 if (join_region->in(slot) == merging->in(TypeFunc::Control)) break; | |
420 } | |
421 assert(slot != join_region->req(), "edge must already exist"); | |
422 | |
423 MergeMemNode* join_m = join->in(TypeFunc::Memory)->as_MergeMem(); | |
424 MergeMemNode* merging_m = merging->in(TypeFunc::Memory)->as_MergeMem(); | |
425 | |
426 // join_m should be an ancestor mergemem of merging | |
427 // Slow path memory comes from the current map (which is from a slow call) | |
428 // Fast path/null path memory comes from the call's input | |
429 | |
430 // Merge the other fast-memory inputs with the new slow-default memory. | |
431 // for (MergeMemStream mms(merged_memory(), fast_mem->as_MergeMem()); mms.next_non_empty2(); ) { | |
432 for (MergeMemStream mms(join_m, merging_m); mms.next_non_empty2(); ) { | |
433 Node* join_slice = mms.force_memory(); | |
434 Node* merging_slice = mms.memory2(); | |
435 if (join_slice != merging_slice) { | |
436 PhiNode* phi; | |
437 // bool new_phi = false; | |
438 // Is the phi for this slice one that we created for this join region or simply | |
439 // one we copied? If it is ours then add | |
440 if (join_slice->is_Phi() && join_slice->as_Phi()->region() == join_region) { | |
441 phi = join_slice->as_Phi(); | |
442 } else { | |
443 // create the phi with join_slice filling supplying memory for all of the | |
444 // control edges to the join region | |
445 phi = PhiNode::make(join_region, join_slice, Type::MEMORY, mms.adr_type(C)); | |
446 phi = (PhiNode*) delay_transform(phi); | |
447 // gvn().set_type(phi, Type::MEMORY); | |
448 // new_phi = true; | |
449 } | |
450 // Now update the phi with the slice for the merging slice | |
451 phi->set_req(slot, merging_slice/* slow_path, slow_slice */); | |
452 // this updates join_m with the phi | |
453 mms.set_memory(phi); | |
454 } | |
455 } | |
456 } | |
457 | |
458 | |
459 //----------------------------- make_call ---------------------------- | |
460 // Trivial runtime call | |
461 void IdealKit::make_leaf_call(const TypeFunc *slow_call_type, | |
462 address slow_call, | |
463 const char *leaf_name, | |
464 Node* parm0, | |
465 Node* parm1, | |
466 Node* parm2) { | |
467 | |
468 // We only handle taking in RawMem and modifying RawMem | |
469 const TypePtr* adr_type = TypeRawPtr::BOTTOM; | |
470 uint adr_idx = C->get_alias_index(adr_type); | |
471 | |
472 // Slow-path leaf call | |
473 int size = slow_call_type->domain()->cnt(); | |
474 CallNode *call = (CallNode*)new (C, size) CallLeafNode( slow_call_type, slow_call, leaf_name, adr_type); | |
475 | |
476 // Set fixed predefined input arguments | |
477 call->init_req( TypeFunc::Control, ctrl() ); | |
478 call->init_req( TypeFunc::I_O , top() ) ; // does no i/o | |
479 // Narrow memory as only memory input | |
480 call->init_req( TypeFunc::Memory , memory(adr_idx)); | |
481 call->init_req( TypeFunc::FramePtr, top() /* frameptr() */ ); | |
482 call->init_req( TypeFunc::ReturnAdr, top() ); | |
483 | |
484 if (parm0 != NULL) call->init_req(TypeFunc::Parms+0, parm0); | |
485 if (parm1 != NULL) call->init_req(TypeFunc::Parms+1, parm1); | |
486 if (parm2 != NULL) call->init_req(TypeFunc::Parms+2, parm2); | |
487 | |
488 // Node *c = _gvn.transform(call); | |
489 call = (CallNode *) _gvn.transform(call); | |
490 Node *c = call; // dbx gets confused with call call->dump() | |
491 | |
492 // Slow leaf call has no side-effects, sets few values | |
493 | |
494 set_ctrl(transform( new (C, 1) ProjNode(call,TypeFunc::Control) )); | |
495 | |
496 // Make memory for the call | |
497 Node* mem = _gvn.transform( new (C, 1) ProjNode(call, TypeFunc::Memory) ); | |
498 | |
499 // Set the RawPtr memory state only. | |
500 set_memory(mem, adr_idx); | |
501 | |
502 assert(C->alias_type(call->adr_type()) == C->alias_type(adr_type), | |
503 "call node must be constructed correctly"); | |
504 } |