Mercurial > hg > graal-compiler
annotate src/share/vm/opto/node.cpp @ 11809:c7769440afd8
improve NodeUtil.cloneNode.
author | Andreas Woess <andreas.woess@jku.at> |
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date | Wed, 25 Sep 2013 17:34:01 +0200 |
parents | 70120f47d403 |
children | 766fac3395d6 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "libadt/vectset.hpp" | |
27 #include "memory/allocation.inline.hpp" | |
28 #include "opto/cfgnode.hpp" | |
29 #include "opto/connode.hpp" | |
30 #include "opto/machnode.hpp" | |
31 #include "opto/matcher.hpp" | |
32 #include "opto/node.hpp" | |
33 #include "opto/opcodes.hpp" | |
34 #include "opto/regmask.hpp" | |
35 #include "opto/type.hpp" | |
36 #include "utilities/copy.hpp" | |
0 | 37 |
38 class RegMask; | |
39 // #include "phase.hpp" | |
40 class PhaseTransform; | |
41 class PhaseGVN; | |
42 | |
43 // Arena we are currently building Nodes in | |
44 const uint Node::NotAMachineReg = 0xffff0000; | |
45 | |
46 #ifndef PRODUCT | |
47 extern int nodes_created; | |
48 #endif | |
49 | |
50 #ifdef ASSERT | |
51 | |
52 //-------------------------- construct_node------------------------------------ | |
53 // Set a breakpoint here to identify where a particular node index is built. | |
54 void Node::verify_construction() { | |
55 _debug_orig = NULL; | |
56 int old_debug_idx = Compile::debug_idx(); | |
57 int new_debug_idx = old_debug_idx+1; | |
58 if (new_debug_idx > 0) { | |
59 // Arrange that the lowest five decimal digits of _debug_idx | |
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60 // will repeat those of _idx. In case this is somehow pathological, |
0 | 61 // we continue to assign negative numbers (!) consecutively. |
62 const int mod = 100000; | |
63 int bump = (int)(_idx - new_debug_idx) % mod; | |
64 if (bump < 0) bump += mod; | |
65 assert(bump >= 0 && bump < mod, ""); | |
66 new_debug_idx += bump; | |
67 } | |
68 Compile::set_debug_idx(new_debug_idx); | |
69 set_debug_idx( new_debug_idx ); | |
10278 | 70 assert(Compile::current()->unique() < (INT_MAX - 1), "Node limit exceeded INT_MAX"); |
71 assert(Compile::current()->live_nodes() < (uint)MaxNodeLimit, "Live Node limit exceeded limit"); | |
0 | 72 if (BreakAtNode != 0 && (_debug_idx == BreakAtNode || (int)_idx == BreakAtNode)) { |
73 tty->print_cr("BreakAtNode: _idx=%d _debug_idx=%d", _idx, _debug_idx); | |
74 BREAKPOINT; | |
75 } | |
76 #if OPTO_DU_ITERATOR_ASSERT | |
77 _last_del = NULL; | |
78 _del_tick = 0; | |
79 #endif | |
80 _hash_lock = 0; | |
81 } | |
82 | |
83 | |
84 // #ifdef ASSERT ... | |
85 | |
86 #if OPTO_DU_ITERATOR_ASSERT | |
87 void DUIterator_Common::sample(const Node* node) { | |
88 _vdui = VerifyDUIterators; | |
89 _node = node; | |
90 _outcnt = node->_outcnt; | |
91 _del_tick = node->_del_tick; | |
92 _last = NULL; | |
93 } | |
94 | |
95 void DUIterator_Common::verify(const Node* node, bool at_end_ok) { | |
96 assert(_node == node, "consistent iterator source"); | |
97 assert(_del_tick == node->_del_tick, "no unexpected deletions allowed"); | |
98 } | |
99 | |
100 void DUIterator_Common::verify_resync() { | |
101 // Ensure that the loop body has just deleted the last guy produced. | |
102 const Node* node = _node; | |
103 // Ensure that at least one copy of the last-seen edge was deleted. | |
104 // Note: It is OK to delete multiple copies of the last-seen edge. | |
105 // Unfortunately, we have no way to verify that all the deletions delete | |
106 // that same edge. On this point we must use the Honor System. | |
107 assert(node->_del_tick >= _del_tick+1, "must have deleted an edge"); | |
108 assert(node->_last_del == _last, "must have deleted the edge just produced"); | |
109 // We liked this deletion, so accept the resulting outcnt and tick. | |
110 _outcnt = node->_outcnt; | |
111 _del_tick = node->_del_tick; | |
112 } | |
113 | |
114 void DUIterator_Common::reset(const DUIterator_Common& that) { | |
115 if (this == &that) return; // ignore assignment to self | |
116 if (!_vdui) { | |
117 // We need to initialize everything, overwriting garbage values. | |
118 _last = that._last; | |
119 _vdui = that._vdui; | |
120 } | |
121 // Note: It is legal (though odd) for an iterator over some node x | |
122 // to be reassigned to iterate over another node y. Some doubly-nested | |
123 // progress loops depend on being able to do this. | |
124 const Node* node = that._node; | |
125 // Re-initialize everything, except _last. | |
126 _node = node; | |
127 _outcnt = node->_outcnt; | |
128 _del_tick = node->_del_tick; | |
129 } | |
130 | |
131 void DUIterator::sample(const Node* node) { | |
132 DUIterator_Common::sample(node); // Initialize the assertion data. | |
133 _refresh_tick = 0; // No refreshes have happened, as yet. | |
134 } | |
135 | |
136 void DUIterator::verify(const Node* node, bool at_end_ok) { | |
137 DUIterator_Common::verify(node, at_end_ok); | |
138 assert(_idx < node->_outcnt + (uint)at_end_ok, "idx in range"); | |
139 } | |
140 | |
141 void DUIterator::verify_increment() { | |
142 if (_refresh_tick & 1) { | |
143 // We have refreshed the index during this loop. | |
144 // Fix up _idx to meet asserts. | |
145 if (_idx > _outcnt) _idx = _outcnt; | |
146 } | |
147 verify(_node, true); | |
148 } | |
149 | |
150 void DUIterator::verify_resync() { | |
151 // Note: We do not assert on _outcnt, because insertions are OK here. | |
152 DUIterator_Common::verify_resync(); | |
153 // Make sure we are still in sync, possibly with no more out-edges: | |
154 verify(_node, true); | |
155 } | |
156 | |
157 void DUIterator::reset(const DUIterator& that) { | |
158 if (this == &that) return; // self assignment is always a no-op | |
159 assert(that._refresh_tick == 0, "assign only the result of Node::outs()"); | |
160 assert(that._idx == 0, "assign only the result of Node::outs()"); | |
161 assert(_idx == that._idx, "already assigned _idx"); | |
162 if (!_vdui) { | |
163 // We need to initialize everything, overwriting garbage values. | |
164 sample(that._node); | |
165 } else { | |
166 DUIterator_Common::reset(that); | |
167 if (_refresh_tick & 1) { | |
168 _refresh_tick++; // Clear the "was refreshed" flag. | |
169 } | |
170 assert(_refresh_tick < 2*100000, "DU iteration must converge quickly"); | |
171 } | |
172 } | |
173 | |
174 void DUIterator::refresh() { | |
175 DUIterator_Common::sample(_node); // Re-fetch assertion data. | |
176 _refresh_tick |= 1; // Set the "was refreshed" flag. | |
177 } | |
178 | |
179 void DUIterator::verify_finish() { | |
180 // If the loop has killed the node, do not require it to re-run. | |
181 if (_node->_outcnt == 0) _refresh_tick &= ~1; | |
182 // If this assert triggers, it means that a loop used refresh_out_pos | |
183 // to re-synch an iteration index, but the loop did not correctly | |
184 // re-run itself, using a "while (progress)" construct. | |
185 // This iterator enforces the rule that you must keep trying the loop | |
186 // until it "runs clean" without any need for refreshing. | |
187 assert(!(_refresh_tick & 1), "the loop must run once with no refreshing"); | |
188 } | |
189 | |
190 | |
191 void DUIterator_Fast::verify(const Node* node, bool at_end_ok) { | |
192 DUIterator_Common::verify(node, at_end_ok); | |
193 Node** out = node->_out; | |
194 uint cnt = node->_outcnt; | |
195 assert(cnt == _outcnt, "no insertions allowed"); | |
196 assert(_outp >= out && _outp <= out + cnt - !at_end_ok, "outp in range"); | |
197 // This last check is carefully designed to work for NO_OUT_ARRAY. | |
198 } | |
199 | |
200 void DUIterator_Fast::verify_limit() { | |
201 const Node* node = _node; | |
202 verify(node, true); | |
203 assert(_outp == node->_out + node->_outcnt, "limit still correct"); | |
204 } | |
205 | |
206 void DUIterator_Fast::verify_resync() { | |
207 const Node* node = _node; | |
208 if (_outp == node->_out + _outcnt) { | |
209 // Note that the limit imax, not the pointer i, gets updated with the | |
210 // exact count of deletions. (For the pointer it's always "--i".) | |
211 assert(node->_outcnt+node->_del_tick == _outcnt+_del_tick, "no insertions allowed with deletion(s)"); | |
212 // This is a limit pointer, with a name like "imax". | |
213 // Fudge the _last field so that the common assert will be happy. | |
214 _last = (Node*) node->_last_del; | |
215 DUIterator_Common::verify_resync(); | |
216 } else { | |
217 assert(node->_outcnt < _outcnt, "no insertions allowed with deletion(s)"); | |
218 // A normal internal pointer. | |
219 DUIterator_Common::verify_resync(); | |
220 // Make sure we are still in sync, possibly with no more out-edges: | |
221 verify(node, true); | |
222 } | |
223 } | |
224 | |
225 void DUIterator_Fast::verify_relimit(uint n) { | |
226 const Node* node = _node; | |
227 assert((int)n > 0, "use imax -= n only with a positive count"); | |
228 // This must be a limit pointer, with a name like "imax". | |
229 assert(_outp == node->_out + node->_outcnt, "apply -= only to a limit (imax)"); | |
230 // The reported number of deletions must match what the node saw. | |
231 assert(node->_del_tick == _del_tick + n, "must have deleted n edges"); | |
232 // Fudge the _last field so that the common assert will be happy. | |
233 _last = (Node*) node->_last_del; | |
234 DUIterator_Common::verify_resync(); | |
235 } | |
236 | |
237 void DUIterator_Fast::reset(const DUIterator_Fast& that) { | |
238 assert(_outp == that._outp, "already assigned _outp"); | |
239 DUIterator_Common::reset(that); | |
240 } | |
241 | |
242 void DUIterator_Last::verify(const Node* node, bool at_end_ok) { | |
243 // at_end_ok means the _outp is allowed to underflow by 1 | |
244 _outp += at_end_ok; | |
245 DUIterator_Fast::verify(node, at_end_ok); // check _del_tick, etc. | |
246 _outp -= at_end_ok; | |
247 assert(_outp == (node->_out + node->_outcnt) - 1, "pointer must point to end of nodes"); | |
248 } | |
249 | |
250 void DUIterator_Last::verify_limit() { | |
251 // Do not require the limit address to be resynched. | |
252 //verify(node, true); | |
253 assert(_outp == _node->_out, "limit still correct"); | |
254 } | |
255 | |
256 void DUIterator_Last::verify_step(uint num_edges) { | |
257 assert((int)num_edges > 0, "need non-zero edge count for loop progress"); | |
258 _outcnt -= num_edges; | |
259 _del_tick += num_edges; | |
260 // Make sure we are still in sync, possibly with no more out-edges: | |
261 const Node* node = _node; | |
262 verify(node, true); | |
263 assert(node->_last_del == _last, "must have deleted the edge just produced"); | |
264 } | |
265 | |
266 #endif //OPTO_DU_ITERATOR_ASSERT | |
267 | |
268 | |
269 #endif //ASSERT | |
270 | |
271 | |
272 // This constant used to initialize _out may be any non-null value. | |
273 // The value NULL is reserved for the top node only. | |
274 #define NO_OUT_ARRAY ((Node**)-1) | |
275 | |
276 // This funny expression handshakes with Node::operator new | |
277 // to pull Compile::current out of the new node's _out field, | |
278 // and then calls a subroutine which manages most field | |
279 // initializations. The only one which is tricky is the | |
280 // _idx field, which is const, and so must be initialized | |
281 // by a return value, not an assignment. | |
282 // | |
283 // (Aren't you thankful that Java finals don't require so many tricks?) | |
284 #define IDX_INIT(req) this->Init((req), (Compile*) this->_out) | |
285 #ifdef _MSC_VER // the IDX_INIT hack falls foul of warning C4355 | |
286 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
287 #endif | |
288 | |
289 // Out-of-line code from node constructors. | |
290 // Executed only when extra debug info. is being passed around. | |
291 static void init_node_notes(Compile* C, int idx, Node_Notes* nn) { | |
292 C->set_node_notes_at(idx, nn); | |
293 } | |
294 | |
295 // Shared initialization code. | |
296 inline int Node::Init(int req, Compile* C) { | |
297 assert(Compile::current() == C, "must use operator new(Compile*)"); | |
298 int idx = C->next_unique(); | |
299 | |
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300 // Allocate memory for the necessary number of edges. |
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301 if (req > 0) { |
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302 // Allocate space for _in array to have double alignment. |
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303 _in = (Node **) ((char *) (C->node_arena()->Amalloc_D(req * sizeof(void*)))); |
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304 #ifdef ASSERT |
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305 _in[req-1] = this; // magic cookie for assertion check |
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306 #endif |
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307 } |
0 | 308 // If there are default notes floating around, capture them: |
309 Node_Notes* nn = C->default_node_notes(); | |
310 if (nn != NULL) init_node_notes(C, idx, nn); | |
311 | |
312 // Note: At this point, C is dead, | |
313 // and we begin to initialize the new Node. | |
314 | |
315 _cnt = _max = req; | |
316 _outcnt = _outmax = 0; | |
317 _class_id = Class_Node; | |
318 _flags = 0; | |
319 _out = NO_OUT_ARRAY; | |
320 return idx; | |
321 } | |
322 | |
323 //------------------------------Node------------------------------------------- | |
324 // Create a Node, with a given number of required edges. | |
325 Node::Node(uint req) | |
326 : _idx(IDX_INIT(req)) | |
327 { | |
328 assert( req < (uint)(MaxNodeLimit - NodeLimitFudgeFactor), "Input limit exceeded" ); | |
329 debug_only( verify_construction() ); | |
330 NOT_PRODUCT(nodes_created++); | |
331 if (req == 0) { | |
332 assert( _in == (Node**)this, "Must not pass arg count to 'new'" ); | |
333 _in = NULL; | |
334 } else { | |
335 assert( _in[req-1] == this, "Must pass arg count to 'new'" ); | |
336 Node** to = _in; | |
337 for(uint i = 0; i < req; i++) { | |
338 to[i] = NULL; | |
339 } | |
340 } | |
341 } | |
342 | |
343 //------------------------------Node------------------------------------------- | |
344 Node::Node(Node *n0) | |
345 : _idx(IDX_INIT(1)) | |
346 { | |
347 debug_only( verify_construction() ); | |
348 NOT_PRODUCT(nodes_created++); | |
349 // Assert we allocated space for input array already | |
350 assert( _in[0] == this, "Must pass arg count to 'new'" ); | |
351 assert( is_not_dead(n0), "can not use dead node"); | |
352 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
353 } | |
354 | |
355 //------------------------------Node------------------------------------------- | |
356 Node::Node(Node *n0, Node *n1) | |
357 : _idx(IDX_INIT(2)) | |
358 { | |
359 debug_only( verify_construction() ); | |
360 NOT_PRODUCT(nodes_created++); | |
361 // Assert we allocated space for input array already | |
362 assert( _in[1] == this, "Must pass arg count to 'new'" ); | |
363 assert( is_not_dead(n0), "can not use dead node"); | |
364 assert( is_not_dead(n1), "can not use dead node"); | |
365 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
366 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
367 } | |
368 | |
369 //------------------------------Node------------------------------------------- | |
370 Node::Node(Node *n0, Node *n1, Node *n2) | |
371 : _idx(IDX_INIT(3)) | |
372 { | |
373 debug_only( verify_construction() ); | |
374 NOT_PRODUCT(nodes_created++); | |
375 // Assert we allocated space for input array already | |
376 assert( _in[2] == this, "Must pass arg count to 'new'" ); | |
377 assert( is_not_dead(n0), "can not use dead node"); | |
378 assert( is_not_dead(n1), "can not use dead node"); | |
379 assert( is_not_dead(n2), "can not use dead node"); | |
380 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
381 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
382 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
383 } | |
384 | |
385 //------------------------------Node------------------------------------------- | |
386 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3) | |
387 : _idx(IDX_INIT(4)) | |
388 { | |
389 debug_only( verify_construction() ); | |
390 NOT_PRODUCT(nodes_created++); | |
391 // Assert we allocated space for input array already | |
392 assert( _in[3] == this, "Must pass arg count to 'new'" ); | |
393 assert( is_not_dead(n0), "can not use dead node"); | |
394 assert( is_not_dead(n1), "can not use dead node"); | |
395 assert( is_not_dead(n2), "can not use dead node"); | |
396 assert( is_not_dead(n3), "can not use dead node"); | |
397 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
398 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
399 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
400 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); | |
401 } | |
402 | |
403 //------------------------------Node------------------------------------------- | |
404 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3, Node *n4) | |
405 : _idx(IDX_INIT(5)) | |
406 { | |
407 debug_only( verify_construction() ); | |
408 NOT_PRODUCT(nodes_created++); | |
409 // Assert we allocated space for input array already | |
410 assert( _in[4] == this, "Must pass arg count to 'new'" ); | |
411 assert( is_not_dead(n0), "can not use dead node"); | |
412 assert( is_not_dead(n1), "can not use dead node"); | |
413 assert( is_not_dead(n2), "can not use dead node"); | |
414 assert( is_not_dead(n3), "can not use dead node"); | |
415 assert( is_not_dead(n4), "can not use dead node"); | |
416 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
417 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
418 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
419 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); | |
420 _in[4] = n4; if (n4 != NULL) n4->add_out((Node *)this); | |
421 } | |
422 | |
423 //------------------------------Node------------------------------------------- | |
424 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3, | |
425 Node *n4, Node *n5) | |
426 : _idx(IDX_INIT(6)) | |
427 { | |
428 debug_only( verify_construction() ); | |
429 NOT_PRODUCT(nodes_created++); | |
430 // Assert we allocated space for input array already | |
431 assert( _in[5] == this, "Must pass arg count to 'new'" ); | |
432 assert( is_not_dead(n0), "can not use dead node"); | |
433 assert( is_not_dead(n1), "can not use dead node"); | |
434 assert( is_not_dead(n2), "can not use dead node"); | |
435 assert( is_not_dead(n3), "can not use dead node"); | |
436 assert( is_not_dead(n4), "can not use dead node"); | |
437 assert( is_not_dead(n5), "can not use dead node"); | |
438 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
439 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
440 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
441 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); | |
442 _in[4] = n4; if (n4 != NULL) n4->add_out((Node *)this); | |
443 _in[5] = n5; if (n5 != NULL) n5->add_out((Node *)this); | |
444 } | |
445 | |
446 //------------------------------Node------------------------------------------- | |
447 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3, | |
448 Node *n4, Node *n5, Node *n6) | |
449 : _idx(IDX_INIT(7)) | |
450 { | |
451 debug_only( verify_construction() ); | |
452 NOT_PRODUCT(nodes_created++); | |
453 // Assert we allocated space for input array already | |
454 assert( _in[6] == this, "Must pass arg count to 'new'" ); | |
455 assert( is_not_dead(n0), "can not use dead node"); | |
456 assert( is_not_dead(n1), "can not use dead node"); | |
457 assert( is_not_dead(n2), "can not use dead node"); | |
458 assert( is_not_dead(n3), "can not use dead node"); | |
459 assert( is_not_dead(n4), "can not use dead node"); | |
460 assert( is_not_dead(n5), "can not use dead node"); | |
461 assert( is_not_dead(n6), "can not use dead node"); | |
462 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
463 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
464 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
465 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); | |
466 _in[4] = n4; if (n4 != NULL) n4->add_out((Node *)this); | |
467 _in[5] = n5; if (n5 != NULL) n5->add_out((Node *)this); | |
468 _in[6] = n6; if (n6 != NULL) n6->add_out((Node *)this); | |
469 } | |
470 | |
471 | |
472 //------------------------------clone------------------------------------------ | |
473 // Clone a Node. | |
474 Node *Node::clone() const { | |
10278 | 475 Compile* C = Compile::current(); |
0 | 476 uint s = size_of(); // Size of inherited Node |
10278 | 477 Node *n = (Node*)C->node_arena()->Amalloc_D(size_of() + _max*sizeof(Node*)); |
0 | 478 Copy::conjoint_words_to_lower((HeapWord*)this, (HeapWord*)n, s); |
479 // Set the new input pointer array | |
480 n->_in = (Node**)(((char*)n)+s); | |
481 // Cannot share the old output pointer array, so kill it | |
482 n->_out = NO_OUT_ARRAY; | |
483 // And reset the counters to 0 | |
484 n->_outcnt = 0; | |
485 n->_outmax = 0; | |
486 // Unlock this guy, since he is not in any hash table. | |
487 debug_only(n->_hash_lock = 0); | |
488 // Walk the old node's input list to duplicate its edges | |
489 uint i; | |
490 for( i = 0; i < len(); i++ ) { | |
491 Node *x = in(i); | |
492 n->_in[i] = x; | |
493 if (x != NULL) x->add_out(n); | |
494 } | |
495 if (is_macro()) | |
10278 | 496 C->add_macro_node(n); |
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497 if (is_expensive()) |
10278 | 498 C->add_expensive_node(n); |
0 | 499 |
10278 | 500 n->set_idx(C->next_unique()); // Get new unique index as well |
0 | 501 debug_only( n->verify_construction() ); |
502 NOT_PRODUCT(nodes_created++); | |
503 // Do not patch over the debug_idx of a clone, because it makes it | |
504 // impossible to break on the clone's moment of creation. | |
505 //debug_only( n->set_debug_idx( debug_idx() ) ); | |
506 | |
10278 | 507 C->copy_node_notes_to(n, (Node*) this); |
0 | 508 |
509 // MachNode clone | |
510 uint nopnds; | |
511 if (this->is_Mach() && (nopnds = this->as_Mach()->num_opnds()) > 0) { | |
512 MachNode *mach = n->as_Mach(); | |
513 MachNode *mthis = this->as_Mach(); | |
514 // Get address of _opnd_array. | |
515 // It should be the same offset since it is the clone of this node. | |
516 MachOper **from = mthis->_opnds; | |
517 MachOper **to = (MachOper **)((size_t)(&mach->_opnds) + | |
518 pointer_delta((const void*)from, | |
519 (const void*)(&mthis->_opnds), 1)); | |
520 mach->_opnds = to; | |
521 for ( uint i = 0; i < nopnds; ++i ) { | |
10278 | 522 to[i] = from[i]->clone(C); |
0 | 523 } |
524 } | |
525 // cloning CallNode may need to clone JVMState | |
526 if (n->is_Call()) { | |
10278 | 527 n->as_Call()->clone_jvms(C); |
0 | 528 } |
529 return n; // Return the clone | |
530 } | |
531 | |
532 //---------------------------setup_is_top-------------------------------------- | |
533 // Call this when changing the top node, to reassert the invariants | |
534 // required by Node::is_top. See Compile::set_cached_top_node. | |
535 void Node::setup_is_top() { | |
536 if (this == (Node*)Compile::current()->top()) { | |
537 // This node has just become top. Kill its out array. | |
538 _outcnt = _outmax = 0; | |
539 _out = NULL; // marker value for top | |
540 assert(is_top(), "must be top"); | |
541 } else { | |
542 if (_out == NULL) _out = NO_OUT_ARRAY; | |
543 assert(!is_top(), "must not be top"); | |
544 } | |
545 } | |
546 | |
547 | |
548 //------------------------------~Node------------------------------------------ | |
549 // Fancy destructor; eagerly attempt to reclaim Node numberings and storage | |
550 extern int reclaim_idx ; | |
551 extern int reclaim_in ; | |
552 extern int reclaim_node; | |
553 void Node::destruct() { | |
554 // Eagerly reclaim unique Node numberings | |
555 Compile* compile = Compile::current(); | |
556 if ((uint)_idx+1 == compile->unique()) { | |
557 compile->set_unique(compile->unique()-1); | |
558 #ifdef ASSERT | |
559 reclaim_idx++; | |
560 #endif | |
561 } | |
562 // Clear debug info: | |
563 Node_Notes* nn = compile->node_notes_at(_idx); | |
564 if (nn != NULL) nn->clear(); | |
565 // Walk the input array, freeing the corresponding output edges | |
566 _cnt = _max; // forget req/prec distinction | |
567 uint i; | |
568 for( i = 0; i < _max; i++ ) { | |
569 set_req(i, NULL); | |
570 //assert(def->out(def->outcnt()-1) == (Node *)this,"bad def-use hacking in reclaim"); | |
571 } | |
572 assert(outcnt() == 0, "deleting a node must not leave a dangling use"); | |
573 // See if the input array was allocated just prior to the object | |
574 int edge_size = _max*sizeof(void*); | |
575 int out_edge_size = _outmax*sizeof(void*); | |
576 char *edge_end = ((char*)_in) + edge_size; | |
577 char *out_array = (char*)(_out == NO_OUT_ARRAY? NULL: _out); | |
578 char *out_edge_end = out_array + out_edge_size; | |
579 int node_size = size_of(); | |
580 | |
581 // Free the output edge array | |
582 if (out_edge_size > 0) { | |
583 #ifdef ASSERT | |
584 if( out_edge_end == compile->node_arena()->hwm() ) | |
585 reclaim_in += out_edge_size; // count reclaimed out edges with in edges | |
586 #endif | |
587 compile->node_arena()->Afree(out_array, out_edge_size); | |
588 } | |
589 | |
590 // Free the input edge array and the node itself | |
591 if( edge_end == (char*)this ) { | |
592 #ifdef ASSERT | |
593 if( edge_end+node_size == compile->node_arena()->hwm() ) { | |
594 reclaim_in += edge_size; | |
595 reclaim_node+= node_size; | |
596 } | |
597 #else | |
598 // It was; free the input array and object all in one hit | |
599 compile->node_arena()->Afree(_in,edge_size+node_size); | |
600 #endif | |
601 } else { | |
602 | |
603 // Free just the input array | |
604 #ifdef ASSERT | |
605 if( edge_end == compile->node_arena()->hwm() ) | |
606 reclaim_in += edge_size; | |
607 #endif | |
608 compile->node_arena()->Afree(_in,edge_size); | |
609 | |
610 // Free just the object | |
611 #ifdef ASSERT | |
612 if( ((char*)this) + node_size == compile->node_arena()->hwm() ) | |
613 reclaim_node+= node_size; | |
614 #else | |
615 compile->node_arena()->Afree(this,node_size); | |
616 #endif | |
617 } | |
618 if (is_macro()) { | |
619 compile->remove_macro_node(this); | |
620 } | |
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621 if (is_expensive()) { |
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622 compile->remove_expensive_node(this); |
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623 } |
0 | 624 #ifdef ASSERT |
625 // We will not actually delete the storage, but we'll make the node unusable. | |
626 *(address*)this = badAddress; // smash the C++ vtbl, probably | |
627 _in = _out = (Node**) badAddress; | |
628 _max = _cnt = _outmax = _outcnt = 0; | |
629 #endif | |
630 } | |
631 | |
632 //------------------------------grow------------------------------------------- | |
633 // Grow the input array, making space for more edges | |
634 void Node::grow( uint len ) { | |
635 Arena* arena = Compile::current()->node_arena(); | |
636 uint new_max = _max; | |
637 if( new_max == 0 ) { | |
638 _max = 4; | |
639 _in = (Node**)arena->Amalloc(4*sizeof(Node*)); | |
640 Node** to = _in; | |
641 to[0] = NULL; | |
642 to[1] = NULL; | |
643 to[2] = NULL; | |
644 to[3] = NULL; | |
645 return; | |
646 } | |
647 while( new_max <= len ) new_max <<= 1; // Find next power-of-2 | |
648 // Trimming to limit allows a uint8 to handle up to 255 edges. | |
649 // Previously I was using only powers-of-2 which peaked at 128 edges. | |
650 //if( new_max >= limit ) new_max = limit-1; | |
651 _in = (Node**)arena->Arealloc(_in, _max*sizeof(Node*), new_max*sizeof(Node*)); | |
652 Copy::zero_to_bytes(&_in[_max], (new_max-_max)*sizeof(Node*)); // NULL all new space | |
653 _max = new_max; // Record new max length | |
654 // This assertion makes sure that Node::_max is wide enough to | |
655 // represent the numerical value of new_max. | |
656 assert(_max == new_max && _max > len, "int width of _max is too small"); | |
657 } | |
658 | |
659 //-----------------------------out_grow---------------------------------------- | |
660 // Grow the input array, making space for more edges | |
661 void Node::out_grow( uint len ) { | |
662 assert(!is_top(), "cannot grow a top node's out array"); | |
663 Arena* arena = Compile::current()->node_arena(); | |
664 uint new_max = _outmax; | |
665 if( new_max == 0 ) { | |
666 _outmax = 4; | |
667 _out = (Node **)arena->Amalloc(4*sizeof(Node*)); | |
668 return; | |
669 } | |
670 while( new_max <= len ) new_max <<= 1; // Find next power-of-2 | |
671 // Trimming to limit allows a uint8 to handle up to 255 edges. | |
672 // Previously I was using only powers-of-2 which peaked at 128 edges. | |
673 //if( new_max >= limit ) new_max = limit-1; | |
674 assert(_out != NULL && _out != NO_OUT_ARRAY, "out must have sensible value"); | |
675 _out = (Node**)arena->Arealloc(_out,_outmax*sizeof(Node*),new_max*sizeof(Node*)); | |
676 //Copy::zero_to_bytes(&_out[_outmax], (new_max-_outmax)*sizeof(Node*)); // NULL all new space | |
677 _outmax = new_max; // Record new max length | |
678 // This assertion makes sure that Node::_max is wide enough to | |
679 // represent the numerical value of new_max. | |
680 assert(_outmax == new_max && _outmax > len, "int width of _outmax is too small"); | |
681 } | |
682 | |
683 #ifdef ASSERT | |
684 //------------------------------is_dead---------------------------------------- | |
685 bool Node::is_dead() const { | |
686 // Mach and pinch point nodes may look like dead. | |
687 if( is_top() || is_Mach() || (Opcode() == Op_Node && _outcnt > 0) ) | |
688 return false; | |
689 for( uint i = 0; i < _max; i++ ) | |
690 if( _in[i] != NULL ) | |
691 return false; | |
692 dump(); | |
693 return true; | |
694 } | |
695 #endif | |
696 | |
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697 |
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698 //------------------------------is_unreachable--------------------------------- |
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699 bool Node::is_unreachable(PhaseIterGVN &igvn) const { |
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700 assert(!is_Mach(), "doesn't work with MachNodes"); |
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701 return outcnt() == 0 || igvn.type(this) == Type::TOP || in(0)->is_top(); |
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702 } |
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703 |
0 | 704 //------------------------------add_req---------------------------------------- |
705 // Add a new required input at the end | |
706 void Node::add_req( Node *n ) { | |
707 assert( is_not_dead(n), "can not use dead node"); | |
708 | |
709 // Look to see if I can move precedence down one without reallocating | |
710 if( (_cnt >= _max) || (in(_max-1) != NULL) ) | |
711 grow( _max+1 ); | |
712 | |
713 // Find a precedence edge to move | |
714 if( in(_cnt) != NULL ) { // Next precedence edge is busy? | |
715 uint i; | |
716 for( i=_cnt; i<_max; i++ ) | |
717 if( in(i) == NULL ) // Find the NULL at end of prec edge list | |
718 break; // There must be one, since we grew the array | |
719 _in[i] = in(_cnt); // Move prec over, making space for req edge | |
720 } | |
721 _in[_cnt++] = n; // Stuff over old prec edge | |
722 if (n != NULL) n->add_out((Node *)this); | |
723 } | |
724 | |
725 //---------------------------add_req_batch------------------------------------- | |
726 // Add a new required input at the end | |
727 void Node::add_req_batch( Node *n, uint m ) { | |
728 assert( is_not_dead(n), "can not use dead node"); | |
729 // check various edge cases | |
730 if ((int)m <= 1) { | |
731 assert((int)m >= 0, "oob"); | |
732 if (m != 0) add_req(n); | |
733 return; | |
734 } | |
735 | |
736 // Look to see if I can move precedence down one without reallocating | |
737 if( (_cnt+m) > _max || _in[_max-m] ) | |
738 grow( _max+m ); | |
739 | |
740 // Find a precedence edge to move | |
741 if( _in[_cnt] != NULL ) { // Next precedence edge is busy? | |
742 uint i; | |
743 for( i=_cnt; i<_max; i++ ) | |
744 if( _in[i] == NULL ) // Find the NULL at end of prec edge list | |
745 break; // There must be one, since we grew the array | |
746 // Slide all the precs over by m positions (assume #prec << m). | |
747 Copy::conjoint_words_to_higher((HeapWord*)&_in[_cnt], (HeapWord*)&_in[_cnt+m], ((i-_cnt)*sizeof(Node*))); | |
748 } | |
749 | |
750 // Stuff over the old prec edges | |
751 for(uint i=0; i<m; i++ ) { | |
752 _in[_cnt++] = n; | |
753 } | |
754 | |
755 // Insert multiple out edges on the node. | |
756 if (n != NULL && !n->is_top()) { | |
757 for(uint i=0; i<m; i++ ) { | |
758 n->add_out((Node *)this); | |
759 } | |
760 } | |
761 } | |
762 | |
763 //------------------------------del_req---------------------------------------- | |
764 // Delete the required edge and compact the edge array | |
765 void Node::del_req( uint idx ) { | |
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766 assert( idx < _cnt, "oob"); |
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767 assert( !VerifyHashTableKeys || _hash_lock == 0, |
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768 "remove node from hash table before modifying it"); |
0 | 769 // First remove corresponding def-use edge |
770 Node *n = in(idx); | |
771 if (n != NULL) n->del_out((Node *)this); | |
772 _in[idx] = in(--_cnt); // Compact the array | |
773 _in[_cnt] = NULL; // NULL out emptied slot | |
774 } | |
775 | |
776 //------------------------------ins_req---------------------------------------- | |
777 // Insert a new required input at the end | |
778 void Node::ins_req( uint idx, Node *n ) { | |
779 assert( is_not_dead(n), "can not use dead node"); | |
780 add_req(NULL); // Make space | |
781 assert( idx < _max, "Must have allocated enough space"); | |
782 // Slide over | |
783 if(_cnt-idx-1 > 0) { | |
784 Copy::conjoint_words_to_higher((HeapWord*)&_in[idx], (HeapWord*)&_in[idx+1], ((_cnt-idx-1)*sizeof(Node*))); | |
785 } | |
786 _in[idx] = n; // Stuff over old required edge | |
787 if (n != NULL) n->add_out((Node *)this); // Add reciprocal def-use edge | |
788 } | |
789 | |
790 //-----------------------------find_edge--------------------------------------- | |
791 int Node::find_edge(Node* n) { | |
792 for (uint i = 0; i < len(); i++) { | |
793 if (_in[i] == n) return i; | |
794 } | |
795 return -1; | |
796 } | |
797 | |
798 //----------------------------replace_edge------------------------------------- | |
799 int Node::replace_edge(Node* old, Node* neww) { | |
800 if (old == neww) return 0; // nothing to do | |
801 uint nrep = 0; | |
802 for (uint i = 0; i < len(); i++) { | |
803 if (in(i) == old) { | |
804 if (i < req()) | |
805 set_req(i, neww); | |
806 else | |
807 set_prec(i, neww); | |
808 nrep++; | |
809 } | |
810 } | |
811 return nrep; | |
812 } | |
813 | |
10278 | 814 /** |
815 * Replace input edges in the range pointing to 'old' node. | |
816 */ | |
817 int Node::replace_edges_in_range(Node* old, Node* neww, int start, int end) { | |
818 if (old == neww) return 0; // nothing to do | |
819 uint nrep = 0; | |
820 for (int i = start; i < end; i++) { | |
821 if (in(i) == old) { | |
822 set_req(i, neww); | |
823 nrep++; | |
824 } | |
825 } | |
826 return nrep; | |
827 } | |
828 | |
0 | 829 //-------------------------disconnect_inputs----------------------------------- |
830 // NULL out all inputs to eliminate incoming Def-Use edges. | |
831 // Return the number of edges between 'n' and 'this' | |
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832 int Node::disconnect_inputs(Node *n, Compile* C) { |
0 | 833 int edges_to_n = 0; |
834 | |
835 uint cnt = req(); | |
836 for( uint i = 0; i < cnt; ++i ) { | |
837 if( in(i) == 0 ) continue; | |
838 if( in(i) == n ) ++edges_to_n; | |
839 set_req(i, NULL); | |
840 } | |
841 // Remove precedence edges if any exist | |
842 // Note: Safepoints may have precedence edges, even during parsing | |
843 if( (req() != len()) && (in(req()) != NULL) ) { | |
844 uint max = len(); | |
845 for( uint i = 0; i < max; ++i ) { | |
846 if( in(i) == 0 ) continue; | |
847 if( in(i) == n ) ++edges_to_n; | |
848 set_prec(i, NULL); | |
849 } | |
850 } | |
851 | |
852 // Node::destruct requires all out edges be deleted first | |
853 // debug_only(destruct();) // no reuse benefit expected | |
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854 if (edges_to_n == 0) { |
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855 C->record_dead_node(_idx); |
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856 } |
0 | 857 return edges_to_n; |
858 } | |
859 | |
860 //-----------------------------uncast--------------------------------------- | |
861 // %%% Temporary, until we sort out CheckCastPP vs. CastPP. | |
862 // Strip away casting. (It is depth-limited.) | |
863 Node* Node::uncast() const { | |
864 // Should be inline: | |
865 //return is_ConstraintCast() ? uncast_helper(this) : (Node*) this; | |
65 | 866 if (is_ConstraintCast() || is_CheckCastPP()) |
0 | 867 return uncast_helper(this); |
868 else | |
869 return (Node*) this; | |
870 } | |
871 | |
872 //---------------------------uncast_helper------------------------------------- | |
873 Node* Node::uncast_helper(const Node* p) { | |
4778 | 874 #ifdef ASSERT |
875 uint depth_count = 0; | |
876 const Node* orig_p = p; | |
877 #endif | |
878 | |
879 while (true) { | |
880 #ifdef ASSERT | |
881 if (depth_count >= K) { | |
882 orig_p->dump(4); | |
883 if (p != orig_p) | |
884 p->dump(1); | |
885 } | |
886 assert(depth_count++ < K, "infinite loop in Node::uncast_helper"); | |
887 #endif | |
0 | 888 if (p == NULL || p->req() != 2) { |
889 break; | |
890 } else if (p->is_ConstraintCast()) { | |
891 p = p->in(1); | |
65 | 892 } else if (p->is_CheckCastPP()) { |
0 | 893 p = p->in(1); |
894 } else { | |
895 break; | |
896 } | |
897 } | |
898 return (Node*) p; | |
899 } | |
900 | |
901 //------------------------------add_prec--------------------------------------- | |
902 // Add a new precedence input. Precedence inputs are unordered, with | |
903 // duplicates removed and NULLs packed down at the end. | |
904 void Node::add_prec( Node *n ) { | |
905 assert( is_not_dead(n), "can not use dead node"); | |
906 | |
907 // Check for NULL at end | |
908 if( _cnt >= _max || in(_max-1) ) | |
909 grow( _max+1 ); | |
910 | |
911 // Find a precedence edge to move | |
912 uint i = _cnt; | |
913 while( in(i) != NULL ) i++; | |
914 _in[i] = n; // Stuff prec edge over NULL | |
915 if ( n != NULL) n->add_out((Node *)this); // Add mirror edge | |
916 } | |
917 | |
918 //------------------------------rm_prec---------------------------------------- | |
919 // Remove a precedence input. Precedence inputs are unordered, with | |
920 // duplicates removed and NULLs packed down at the end. | |
921 void Node::rm_prec( uint j ) { | |
922 | |
923 // Find end of precedence list to pack NULLs | |
924 uint i; | |
925 for( i=j; i<_max; i++ ) | |
926 if( !_in[i] ) // Find the NULL at end of prec edge list | |
927 break; | |
928 if (_in[j] != NULL) _in[j]->del_out((Node *)this); | |
929 _in[j] = _in[--i]; // Move last element over removed guy | |
930 _in[i] = NULL; // NULL out last element | |
931 } | |
932 | |
933 //------------------------------size_of---------------------------------------- | |
934 uint Node::size_of() const { return sizeof(*this); } | |
935 | |
936 //------------------------------ideal_reg-------------------------------------- | |
937 uint Node::ideal_reg() const { return 0; } | |
938 | |
939 //------------------------------jvms------------------------------------------- | |
940 JVMState* Node::jvms() const { return NULL; } | |
941 | |
942 #ifdef ASSERT | |
943 //------------------------------jvms------------------------------------------- | |
944 bool Node::verify_jvms(const JVMState* using_jvms) const { | |
945 for (JVMState* jvms = this->jvms(); jvms != NULL; jvms = jvms->caller()) { | |
946 if (jvms == using_jvms) return true; | |
947 } | |
948 return false; | |
949 } | |
950 | |
951 //------------------------------init_NodeProperty------------------------------ | |
952 void Node::init_NodeProperty() { | |
953 assert(_max_classes <= max_jushort, "too many NodeProperty classes"); | |
954 assert(_max_flags <= max_jushort, "too many NodeProperty flags"); | |
955 } | |
956 #endif | |
957 | |
958 //------------------------------format----------------------------------------- | |
959 // Print as assembly | |
960 void Node::format( PhaseRegAlloc *, outputStream *st ) const {} | |
961 //------------------------------emit------------------------------------------- | |
962 // Emit bytes starting at parameter 'ptr'. | |
963 void Node::emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const {} | |
964 //------------------------------size------------------------------------------- | |
965 // Size of instruction in bytes | |
966 uint Node::size(PhaseRegAlloc *ra_) const { return 0; } | |
967 | |
968 //------------------------------CFG Construction------------------------------- | |
969 // Nodes that end basic blocks, e.g. IfTrue/IfFalse, JumpProjNode, Root, | |
970 // Goto and Return. | |
971 const Node *Node::is_block_proj() const { return 0; } | |
972 | |
973 // Minimum guaranteed type | |
974 const Type *Node::bottom_type() const { return Type::BOTTOM; } | |
975 | |
976 | |
977 //------------------------------raise_bottom_type------------------------------ | |
978 // Get the worst-case Type output for this Node. | |
979 void Node::raise_bottom_type(const Type* new_type) { | |
980 if (is_Type()) { | |
981 TypeNode *n = this->as_Type(); | |
982 if (VerifyAliases) { | |
983 assert(new_type->higher_equal(n->type()), "new type must refine old type"); | |
984 } | |
985 n->set_type(new_type); | |
986 } else if (is_Load()) { | |
987 LoadNode *n = this->as_Load(); | |
988 if (VerifyAliases) { | |
989 assert(new_type->higher_equal(n->type()), "new type must refine old type"); | |
990 } | |
991 n->set_type(new_type); | |
992 } | |
993 } | |
994 | |
995 //------------------------------Identity--------------------------------------- | |
996 // Return a node that the given node is equivalent to. | |
997 Node *Node::Identity( PhaseTransform * ) { | |
998 return this; // Default to no identities | |
999 } | |
1000 | |
1001 //------------------------------Value------------------------------------------ | |
1002 // Compute a new Type for a node using the Type of the inputs. | |
1003 const Type *Node::Value( PhaseTransform * ) const { | |
1004 return bottom_type(); // Default to worst-case Type | |
1005 } | |
1006 | |
1007 //------------------------------Ideal------------------------------------------ | |
1008 // | |
1009 // 'Idealize' the graph rooted at this Node. | |
1010 // | |
1011 // In order to be efficient and flexible there are some subtle invariants | |
1012 // these Ideal calls need to hold. Running with '+VerifyIterativeGVN' checks | |
1013 // these invariants, although its too slow to have on by default. If you are | |
1014 // hacking an Ideal call, be sure to test with +VerifyIterativeGVN! | |
1015 // | |
1016 // The Ideal call almost arbitrarily reshape the graph rooted at the 'this' | |
1017 // pointer. If ANY change is made, it must return the root of the reshaped | |
1018 // graph - even if the root is the same Node. Example: swapping the inputs | |
1019 // to an AddINode gives the same answer and same root, but you still have to | |
1020 // return the 'this' pointer instead of NULL. | |
1021 // | |
1022 // You cannot return an OLD Node, except for the 'this' pointer. Use the | |
1023 // Identity call to return an old Node; basically if Identity can find | |
1024 // another Node have the Ideal call make no change and return NULL. | |
1025 // Example: AddINode::Ideal must check for add of zero; in this case it | |
1026 // returns NULL instead of doing any graph reshaping. | |
1027 // | |
1028 // You cannot modify any old Nodes except for the 'this' pointer. Due to | |
1029 // sharing there may be other users of the old Nodes relying on their current | |
1030 // semantics. Modifying them will break the other users. | |
1031 // Example: when reshape "(X+3)+4" into "X+7" you must leave the Node for | |
1032 // "X+3" unchanged in case it is shared. | |
1033 // | |
605 | 1034 // If you modify the 'this' pointer's inputs, you should use |
1035 // 'set_req'. If you are making a new Node (either as the new root or | |
1036 // some new internal piece) you may use 'init_req' to set the initial | |
1037 // value. You can make a new Node with either 'new' or 'clone'. In | |
1038 // either case, def-use info is correctly maintained. | |
1039 // | |
0 | 1040 // Example: reshape "(X+3)+4" into "X+7": |
605 | 1041 // set_req(1, in(1)->in(1)); |
1042 // set_req(2, phase->intcon(7)); | |
0 | 1043 // return this; |
605 | 1044 // Example: reshape "X*4" into "X<<2" |
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1045 // return new (C) LShiftINode(in(1), phase->intcon(2)); |
0 | 1046 // |
1047 // You must call 'phase->transform(X)' on any new Nodes X you make, except | |
605 | 1048 // for the returned root node. Example: reshape "X*31" with "(X<<5)-X". |
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1049 // Node *shift=phase->transform(new(C)LShiftINode(in(1),phase->intcon(5))); |
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1050 // return new (C) AddINode(shift, in(1)); |
0 | 1051 // |
1052 // When making a Node for a constant use 'phase->makecon' or 'phase->intcon'. | |
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1053 // These forms are faster than 'phase->transform(new (C) ConNode())' and Do |
0 | 1054 // The Right Thing with def-use info. |
1055 // | |
1056 // You cannot bury the 'this' Node inside of a graph reshape. If the reshaped | |
1057 // graph uses the 'this' Node it must be the root. If you want a Node with | |
1058 // the same Opcode as the 'this' pointer use 'clone'. | |
1059 // | |
1060 Node *Node::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1061 return NULL; // Default to being Ideal already | |
1062 } | |
1063 | |
1064 // Some nodes have specific Ideal subgraph transformations only if they are | |
1065 // unique users of specific nodes. Such nodes should be put on IGVN worklist | |
1066 // for the transformations to happen. | |
1067 bool Node::has_special_unique_user() const { | |
1068 assert(outcnt() == 1, "match only for unique out"); | |
1069 Node* n = unique_out(); | |
1070 int op = Opcode(); | |
1071 if( this->is_Store() ) { | |
1072 // Condition for back-to-back stores folding. | |
1073 return n->Opcode() == op && n->in(MemNode::Memory) == this; | |
1074 } else if( op == Op_AddL ) { | |
1075 // Condition for convL2I(addL(x,y)) ==> addI(convL2I(x),convL2I(y)) | |
1076 return n->Opcode() == Op_ConvL2I && n->in(1) == this; | |
1077 } else if( op == Op_SubI || op == Op_SubL ) { | |
1078 // Condition for subI(x,subI(y,z)) ==> subI(addI(x,z),y) | |
1079 return n->Opcode() == op && n->in(2) == this; | |
1080 } | |
1081 return false; | |
1082 }; | |
1083 | |
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1084 //--------------------------find_exact_control--------------------------------- |
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1085 // Skip Proj and CatchProj nodes chains. Check for Null and Top. |
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1086 Node* Node::find_exact_control(Node* ctrl) { |
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1087 if (ctrl == NULL && this->is_Region()) |
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1088 ctrl = this->as_Region()->is_copy(); |
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1089 |
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1090 if (ctrl != NULL && ctrl->is_CatchProj()) { |
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1091 if (ctrl->as_CatchProj()->_con == CatchProjNode::fall_through_index) |
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1092 ctrl = ctrl->in(0); |
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1093 if (ctrl != NULL && !ctrl->is_top()) |
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1094 ctrl = ctrl->in(0); |
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1095 } |
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1096 |
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1097 if (ctrl != NULL && ctrl->is_Proj()) |
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1098 ctrl = ctrl->in(0); |
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1099 |
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1100 return ctrl; |
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1101 } |
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1102 |
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1103 //--------------------------dominates------------------------------------------ |
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1104 // Helper function for MemNode::all_controls_dominate(). |
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1105 // Check if 'this' control node dominates or equal to 'sub' control node. |
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1106 // We already know that if any path back to Root or Start reaches 'this', |
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1107 // then all paths so, so this is a simple search for one example, |
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1108 // not an exhaustive search for a counterexample. |
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1109 bool Node::dominates(Node* sub, Node_List &nlist) { |
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1110 assert(this->is_CFG(), "expecting control"); |
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1111 assert(sub != NULL && sub->is_CFG(), "expecting control"); |
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1112 |
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1113 // detect dead cycle without regions |
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1114 int iterations_without_region_limit = DominatorSearchLimit; |
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1115 |
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1116 Node* orig_sub = sub; |
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1117 Node* dom = this; |
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1118 bool met_dom = false; |
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1119 nlist.clear(); |
163 | 1120 |
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1121 // Walk 'sub' backward up the chain to 'dom', watching for regions. |
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1122 // After seeing 'dom', continue up to Root or Start. |
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1123 // If we hit a region (backward split point), it may be a loop head. |
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1124 // Keep going through one of the region's inputs. If we reach the |
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1125 // same region again, go through a different input. Eventually we |
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1126 // will either exit through the loop head, or give up. |
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1127 // (If we get confused, break out and return a conservative 'false'.) |
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1128 while (sub != NULL) { |
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1129 if (sub->is_top()) break; // Conservative answer for dead code. |
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1130 if (sub == dom) { |
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1131 if (nlist.size() == 0) { |
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1132 // No Region nodes except loops were visited before and the EntryControl |
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1133 // path was taken for loops: it did not walk in a cycle. |
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1134 return true; |
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1135 } else if (met_dom) { |
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1136 break; // already met before: walk in a cycle |
163 | 1137 } else { |
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1138 // Region nodes were visited. Continue walk up to Start or Root |
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1139 // to make sure that it did not walk in a cycle. |
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1140 met_dom = true; // first time meet |
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1141 iterations_without_region_limit = DominatorSearchLimit; // Reset |
163 | 1142 } |
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1143 } |
163 | 1144 if (sub->is_Start() || sub->is_Root()) { |
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1145 // Success if we met 'dom' along a path to Start or Root. |
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1146 // We assume there are no alternative paths that avoid 'dom'. |
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1147 // (This assumption is up to the caller to ensure!) |
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1148 return met_dom; |
163 | 1149 } |
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1150 Node* up = sub->in(0); |
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1151 // Normalize simple pass-through regions and projections: |
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1152 up = sub->find_exact_control(up); |
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1153 // If sub == up, we found a self-loop. Try to push past it. |
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1154 if (sub == up && sub->is_Loop()) { |
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1155 // Take loop entry path on the way up to 'dom'. |
163 | 1156 up = sub->in(1); // in(LoopNode::EntryControl); |
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1157 } else if (sub == up && sub->is_Region() && sub->req() != 3) { |
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1158 // Always take in(1) path on the way up to 'dom' for clone regions |
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1159 // (with only one input) or regions which merge > 2 paths |
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1160 // (usually used to merge fast/slow paths). |
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1161 up = sub->in(1); |
163 | 1162 } else if (sub == up && sub->is_Region()) { |
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1163 // Try both paths for Regions with 2 input paths (it may be a loop head). |
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1164 // It could give conservative 'false' answer without information |
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1165 // which region's input is the entry path. |
163 | 1166 iterations_without_region_limit = DominatorSearchLimit; // Reset |
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1167 |
163 | 1168 bool region_was_visited_before = false; |
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1169 // Was this Region node visited before? |
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1170 // If so, we have reached it because we accidentally took a |
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1171 // loop-back edge from 'sub' back into the body of the loop, |
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1172 // and worked our way up again to the loop header 'sub'. |
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1173 // So, take the first unexplored path on the way up to 'dom'. |
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1174 for (int j = nlist.size() - 1; j >= 0; j--) { |
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1175 intptr_t ni = (intptr_t)nlist.at(j); |
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1176 Node* visited = (Node*)(ni & ~1); |
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1177 bool visited_twice_already = ((ni & 1) != 0); |
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1178 if (visited == sub) { |
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1179 if (visited_twice_already) { |
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1180 // Visited 2 paths, but still stuck in loop body. Give up. |
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1181 return false; |
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1182 } |
193
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1183 // The Region node was visited before only once. |
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1184 // (We will repush with the low bit set, below.) |
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1185 nlist.remove(j); |
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1186 // We will find a new edge and re-insert. |
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1187 region_was_visited_before = true; |
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1188 break; |
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1189 } |
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1190 } |
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1191 |
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1192 // Find an incoming edge which has not been seen yet; walk through it. |
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1193 assert(up == sub, ""); |
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1194 uint skip = region_was_visited_before ? 1 : 0; |
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1195 for (uint i = 1; i < sub->req(); i++) { |
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1196 Node* in = sub->in(i); |
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1197 if (in != NULL && !in->is_top() && in != sub) { |
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1198 if (skip == 0) { |
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1199 up = in; |
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1200 break; |
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1201 } |
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1202 --skip; // skip this nontrivial input |
163 | 1203 } |
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1204 } |
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1205 |
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1206 // Set 0 bit to indicate that both paths were taken. |
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1207 nlist.push((Node*)((intptr_t)sub + (region_was_visited_before ? 1 : 0))); |
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1208 } |
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1209 |
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1210 if (up == sub) { |
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1211 break; // some kind of tight cycle |
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1212 } |
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1213 if (up == orig_sub && met_dom) { |
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1214 // returned back after visiting 'dom' |
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1215 break; // some kind of cycle |
163 | 1216 } |
1217 if (--iterations_without_region_limit < 0) { | |
193
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1218 break; // dead cycle |
163 | 1219 } |
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1220 sub = up; |
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1221 } |
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1222 |
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1223 // Did not meet Root or Start node in pred. chain. |
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1224 // Conservative answer for dead code. |
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1225 return false; |
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1226 } |
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1227 |
0 | 1228 //------------------------------remove_dead_region----------------------------- |
1229 // This control node is dead. Follow the subgraph below it making everything | |
1230 // using it dead as well. This will happen normally via the usual IterGVN | |
1231 // worklist but this call is more efficient. Do not update use-def info | |
1232 // inside the dead region, just at the borders. | |
305 | 1233 static void kill_dead_code( Node *dead, PhaseIterGVN *igvn ) { |
0 | 1234 // Con's are a popular node to re-hit in the hash table again. |
305 | 1235 if( dead->is_Con() ) return; |
0 | 1236 |
1237 // Can't put ResourceMark here since igvn->_worklist uses the same arena | |
1238 // for verify pass with +VerifyOpto and we add/remove elements in it here. | |
1239 Node_List nstack(Thread::current()->resource_area()); | |
1240 | |
1241 Node *top = igvn->C->top(); | |
1242 nstack.push(dead); | |
1243 | |
1244 while (nstack.size() > 0) { | |
1245 dead = nstack.pop(); | |
1246 if (dead->outcnt() > 0) { | |
1247 // Keep dead node on stack until all uses are processed. | |
1248 nstack.push(dead); | |
1249 // For all Users of the Dead... ;-) | |
1250 for (DUIterator_Last kmin, k = dead->last_outs(kmin); k >= kmin; ) { | |
1251 Node* use = dead->last_out(k); | |
1252 igvn->hash_delete(use); // Yank from hash table prior to mod | |
1253 if (use->in(0) == dead) { // Found another dead node | |
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1254 assert (!use->is_Con(), "Control for Con node should be Root node."); |
0 | 1255 use->set_req(0, top); // Cut dead edge to prevent processing |
1256 nstack.push(use); // the dead node again. | |
1257 } else { // Else found a not-dead user | |
1258 for (uint j = 1; j < use->req(); j++) { | |
1259 if (use->in(j) == dead) { // Turn all dead inputs into TOP | |
1260 use->set_req(j, top); | |
1261 } | |
1262 } | |
1263 igvn->_worklist.push(use); | |
1264 } | |
1265 // Refresh the iterator, since any number of kills might have happened. | |
1266 k = dead->last_outs(kmin); | |
1267 } | |
1268 } else { // (dead->outcnt() == 0) | |
1269 // Done with outputs. | |
1270 igvn->hash_delete(dead); | |
1271 igvn->_worklist.remove(dead); | |
1272 igvn->set_type(dead, Type::TOP); | |
1273 if (dead->is_macro()) { | |
1274 igvn->C->remove_macro_node(dead); | |
1275 } | |
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1276 if (dead->is_expensive()) { |
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1277 igvn->C->remove_expensive_node(dead); |
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1278 } |
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1279 igvn->C->record_dead_node(dead->_idx); |
0 | 1280 // Kill all inputs to the dead guy |
1281 for (uint i=0; i < dead->req(); i++) { | |
1282 Node *n = dead->in(i); // Get input to dead guy | |
1283 if (n != NULL && !n->is_top()) { // Input is valid? | |
1284 dead->set_req(i, top); // Smash input away | |
1285 if (n->outcnt() == 0) { // Input also goes dead? | |
1286 if (!n->is_Con()) | |
1287 nstack.push(n); // Clear it out as well | |
1288 } else if (n->outcnt() == 1 && | |
1289 n->has_special_unique_user()) { | |
1290 igvn->add_users_to_worklist( n ); | |
1291 } else if (n->outcnt() <= 2 && n->is_Store()) { | |
1292 // Push store's uses on worklist to enable folding optimization for | |
1293 // store/store and store/load to the same address. | |
1294 // The restriction (outcnt() <= 2) is the same as in set_req_X() | |
1295 // and remove_globally_dead_node(). | |
1296 igvn->add_users_to_worklist( n ); | |
1297 } | |
1298 } | |
1299 } | |
1300 } // (dead->outcnt() == 0) | |
1301 } // while (nstack.size() > 0) for outputs | |
305 | 1302 return; |
0 | 1303 } |
1304 | |
1305 //------------------------------remove_dead_region----------------------------- | |
1306 bool Node::remove_dead_region(PhaseGVN *phase, bool can_reshape) { | |
1307 Node *n = in(0); | |
1308 if( !n ) return false; | |
1309 // Lost control into this guy? I.e., it became unreachable? | |
1310 // Aggressively kill all unreachable code. | |
1311 if (can_reshape && n->is_top()) { | |
305 | 1312 kill_dead_code(this, phase->is_IterGVN()); |
1313 return false; // Node is dead. | |
0 | 1314 } |
1315 | |
1316 if( n->is_Region() && n->as_Region()->is_copy() ) { | |
1317 Node *m = n->nonnull_req(); | |
1318 set_req(0, m); | |
1319 return true; | |
1320 } | |
1321 return false; | |
1322 } | |
1323 | |
1324 //------------------------------Ideal_DU_postCCP------------------------------- | |
1325 // Idealize graph, using DU info. Must clone result into new-space | |
1326 Node *Node::Ideal_DU_postCCP( PhaseCCP * ) { | |
1327 return NULL; // Default to no change | |
1328 } | |
1329 | |
1330 //------------------------------hash------------------------------------------- | |
1331 // Hash function over Nodes. | |
1332 uint Node::hash() const { | |
1333 uint sum = 0; | |
1334 for( uint i=0; i<_cnt; i++ ) // Add in all inputs | |
1335 sum = (sum<<1)-(uintptr_t)in(i); // Ignore embedded NULLs | |
1336 return (sum>>2) + _cnt + Opcode(); | |
1337 } | |
1338 | |
1339 //------------------------------cmp-------------------------------------------- | |
1340 // Compare special parts of simple Nodes | |
1341 uint Node::cmp( const Node &n ) const { | |
1342 return 1; // Must be same | |
1343 } | |
1344 | |
1345 //------------------------------rematerialize----------------------------------- | |
1346 // Should we clone rather than spill this instruction? | |
1347 bool Node::rematerialize() const { | |
1348 if ( is_Mach() ) | |
1349 return this->as_Mach()->rematerialize(); | |
1350 else | |
1351 return (_flags & Flag_rematerialize) != 0; | |
1352 } | |
1353 | |
1354 //------------------------------needs_anti_dependence_check--------------------- | |
1355 // Nodes which use memory without consuming it, hence need antidependences. | |
1356 bool Node::needs_anti_dependence_check() const { | |
1357 if( req() < 2 || (_flags & Flag_needs_anti_dependence_check) == 0 ) | |
1358 return false; | |
1359 else | |
1360 return in(1)->bottom_type()->has_memory(); | |
1361 } | |
1362 | |
1363 | |
1364 // Get an integer constant from a ConNode (or CastIINode). | |
1365 // Return a default value if there is no apparent constant here. | |
1366 const TypeInt* Node::find_int_type() const { | |
1367 if (this->is_Type()) { | |
1368 return this->as_Type()->type()->isa_int(); | |
1369 } else if (this->is_Con()) { | |
1370 assert(is_Mach(), "should be ConNode(TypeNode) or else a MachNode"); | |
1371 return this->bottom_type()->isa_int(); | |
1372 } | |
1373 return NULL; | |
1374 } | |
1375 | |
1376 // Get a pointer constant from a ConstNode. | |
1377 // Returns the constant if it is a pointer ConstNode | |
1378 intptr_t Node::get_ptr() const { | |
1379 assert( Opcode() == Op_ConP, "" ); | |
1380 return ((ConPNode*)this)->type()->is_ptr()->get_con(); | |
1381 } | |
1382 | |
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1383 // Get a narrow oop constant from a ConNNode. |
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1384 intptr_t Node::get_narrowcon() const { |
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1385 assert( Opcode() == Op_ConN, "" ); |
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1386 return ((ConNNode*)this)->type()->is_narrowoop()->get_con(); |
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1387 } |
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1388 |
0 | 1389 // Get a long constant from a ConNode. |
1390 // Return a default value if there is no apparent constant here. | |
1391 const TypeLong* Node::find_long_type() const { | |
1392 if (this->is_Type()) { | |
1393 return this->as_Type()->type()->isa_long(); | |
1394 } else if (this->is_Con()) { | |
1395 assert(is_Mach(), "should be ConNode(TypeNode) or else a MachNode"); | |
1396 return this->bottom_type()->isa_long(); | |
1397 } | |
1398 return NULL; | |
1399 } | |
1400 | |
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1401 |
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1402 /** |
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1403 * Return a ptr type for nodes which should have it. |
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1404 */ |
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1405 const TypePtr* Node::get_ptr_type() const { |
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1406 const TypePtr* tp = this->bottom_type()->make_ptr(); |
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1407 #ifdef ASSERT |
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1408 if (tp == NULL) { |
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1409 this->dump(1); |
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1410 assert((tp != NULL), "unexpected node type"); |
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1411 } |
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1412 #endif |
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1413 return tp; |
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1414 } |
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1415 |
0 | 1416 // Get a double constant from a ConstNode. |
1417 // Returns the constant if it is a double ConstNode | |
1418 jdouble Node::getd() const { | |
1419 assert( Opcode() == Op_ConD, "" ); | |
1420 return ((ConDNode*)this)->type()->is_double_constant()->getd(); | |
1421 } | |
1422 | |
1423 // Get a float constant from a ConstNode. | |
1424 // Returns the constant if it is a float ConstNode | |
1425 jfloat Node::getf() const { | |
1426 assert( Opcode() == Op_ConF, "" ); | |
1427 return ((ConFNode*)this)->type()->is_float_constant()->getf(); | |
1428 } | |
1429 | |
1430 #ifndef PRODUCT | |
1431 | |
1432 //----------------------------NotANode---------------------------------------- | |
1433 // Used in debugging code to avoid walking across dead or uninitialized edges. | |
1434 static inline bool NotANode(const Node* n) { | |
1435 if (n == NULL) return true; | |
1436 if (((intptr_t)n & 1) != 0) return true; // uninitialized, etc. | |
1437 if (*(address*)n == badAddress) return true; // kill by Node::destruct | |
1438 return false; | |
1439 } | |
1440 | |
1441 | |
1442 //------------------------------find------------------------------------------ | |
1443 // Find a neighbor of this Node with the given _idx | |
1444 // If idx is negative, find its absolute value, following both _in and _out. | |
2403 | 1445 static void find_recur(Compile* C, Node* &result, Node *n, int idx, bool only_ctrl, |
1446 VectorSet* old_space, VectorSet* new_space ) { | |
0 | 1447 int node_idx = (idx >= 0) ? idx : -idx; |
1448 if (NotANode(n)) return; // Gracefully handle NULL, -1, 0xabababab, etc. | |
2403 | 1449 // Contained in new_space or old_space? Check old_arena first since it's mostly empty. |
1450 VectorSet *v = C->old_arena()->contains(n) ? old_space : new_space; | |
0 | 1451 if( v->test(n->_idx) ) return; |
1452 if( (int)n->_idx == node_idx | |
1453 debug_only(|| n->debug_idx() == node_idx) ) { | |
1454 if (result != NULL) | |
1455 tty->print("find: " INTPTR_FORMAT " and " INTPTR_FORMAT " both have idx==%d\n", | |
1456 (uintptr_t)result, (uintptr_t)n, node_idx); | |
1457 result = n; | |
1458 } | |
1459 v->set(n->_idx); | |
1460 for( uint i=0; i<n->len(); i++ ) { | |
1461 if( only_ctrl && !(n->is_Region()) && (n->Opcode() != Op_Root) && (i != TypeFunc::Control) ) continue; | |
2403 | 1462 find_recur(C, result, n->in(i), idx, only_ctrl, old_space, new_space ); |
0 | 1463 } |
1464 // Search along forward edges also: | |
1465 if (idx < 0 && !only_ctrl) { | |
1466 for( uint j=0; j<n->outcnt(); j++ ) { | |
2403 | 1467 find_recur(C, result, n->raw_out(j), idx, only_ctrl, old_space, new_space ); |
0 | 1468 } |
1469 } | |
1470 #ifdef ASSERT | |
2403 | 1471 // Search along debug_orig edges last, checking for cycles |
1472 Node* orig = n->debug_orig(); | |
1473 if (orig != NULL) { | |
1474 do { | |
1475 if (NotANode(orig)) break; | |
1476 find_recur(C, result, orig, idx, only_ctrl, old_space, new_space ); | |
1477 orig = orig->debug_orig(); | |
1478 } while (orig != NULL && orig != n->debug_orig()); | |
0 | 1479 } |
1480 #endif //ASSERT | |
1481 } | |
1482 | |
1483 // call this from debugger: | |
1484 Node* find_node(Node* n, int idx) { | |
1485 return n->find(idx); | |
1486 } | |
1487 | |
1488 //------------------------------find------------------------------------------- | |
1489 Node* Node::find(int idx) const { | |
1490 ResourceArea *area = Thread::current()->resource_area(); | |
1491 VectorSet old_space(area), new_space(area); | |
1492 Node* result = NULL; | |
2403 | 1493 find_recur(Compile::current(), result, (Node*) this, idx, false, &old_space, &new_space ); |
0 | 1494 return result; |
1495 } | |
1496 | |
1497 //------------------------------find_ctrl-------------------------------------- | |
1498 // Find an ancestor to this node in the control history with given _idx | |
1499 Node* Node::find_ctrl(int idx) const { | |
1500 ResourceArea *area = Thread::current()->resource_area(); | |
1501 VectorSet old_space(area), new_space(area); | |
1502 Node* result = NULL; | |
2403 | 1503 find_recur(Compile::current(), result, (Node*) this, idx, true, &old_space, &new_space ); |
0 | 1504 return result; |
1505 } | |
1506 #endif | |
1507 | |
1508 | |
1509 | |
1510 #ifndef PRODUCT | |
1511 int Node::_in_dump_cnt = 0; | |
1512 | |
1513 // -----------------------------Name------------------------------------------- | |
1514 extern const char *NodeClassNames[]; | |
1515 const char *Node::Name() const { return NodeClassNames[Opcode()]; } | |
1516 | |
1517 static bool is_disconnected(const Node* n) { | |
1518 for (uint i = 0; i < n->req(); i++) { | |
1519 if (n->in(i) != NULL) return false; | |
1520 } | |
1521 return true; | |
1522 } | |
1523 | |
1524 #ifdef ASSERT | |
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1525 static void dump_orig(Node* orig, outputStream *st) { |
0 | 1526 Compile* C = Compile::current(); |
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1527 if (NotANode(orig)) orig = NULL; |
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1528 if (orig != NULL && !C->node_arena()->contains(orig)) orig = NULL; |
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1529 if (orig == NULL) return; |
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1530 st->print(" !orig="); |
0 | 1531 Node* fast = orig->debug_orig(); // tortoise & hare algorithm to detect loops |
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1532 if (NotANode(fast)) fast = NULL; |
0 | 1533 while (orig != NULL) { |
1534 bool discon = is_disconnected(orig); // if discon, print [123] else 123 | |
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1535 if (discon) st->print("["); |
0 | 1536 if (!Compile::current()->node_arena()->contains(orig)) |
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1537 st->print("o"); |
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1538 st->print("%d", orig->_idx); |
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1539 if (discon) st->print("]"); |
0 | 1540 orig = orig->debug_orig(); |
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1541 if (NotANode(orig)) orig = NULL; |
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1542 if (orig != NULL && !C->node_arena()->contains(orig)) orig = NULL; |
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1543 if (orig != NULL) st->print(","); |
0 | 1544 if (fast != NULL) { |
1545 // Step fast twice for each single step of orig: | |
1546 fast = fast->debug_orig(); | |
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1547 if (NotANode(fast)) fast = NULL; |
0 | 1548 if (fast != NULL && fast != orig) { |
1549 fast = fast->debug_orig(); | |
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1550 if (NotANode(fast)) fast = NULL; |
0 | 1551 } |
1552 if (fast == orig) { | |
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1553 st->print("..."); |
0 | 1554 break; |
1555 } | |
1556 } | |
1557 } | |
1558 } | |
1559 | |
1560 void Node::set_debug_orig(Node* orig) { | |
1561 _debug_orig = orig; | |
1562 if (BreakAtNode == 0) return; | |
1563 if (NotANode(orig)) orig = NULL; | |
1564 int trip = 10; | |
1565 while (orig != NULL) { | |
1566 if (orig->debug_idx() == BreakAtNode || (int)orig->_idx == BreakAtNode) { | |
1567 tty->print_cr("BreakAtNode: _idx=%d _debug_idx=%d orig._idx=%d orig._debug_idx=%d", | |
1568 this->_idx, this->debug_idx(), orig->_idx, orig->debug_idx()); | |
1569 BREAKPOINT; | |
1570 } | |
1571 orig = orig->debug_orig(); | |
1572 if (NotANode(orig)) orig = NULL; | |
1573 if (trip-- <= 0) break; | |
1574 } | |
1575 } | |
1576 #endif //ASSERT | |
1577 | |
1578 //------------------------------dump------------------------------------------ | |
1579 // Dump a Node | |
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1580 void Node::dump(const char* suffix, outputStream *st) const { |
0 | 1581 Compile* C = Compile::current(); |
1582 bool is_new = C->node_arena()->contains(this); | |
1583 _in_dump_cnt++; | |
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1584 st->print("%c%d\t%s\t=== ", is_new ? ' ' : 'o', _idx, Name()); |
0 | 1585 |
1586 // Dump the required and precedence inputs | |
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1587 dump_req(st); |
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1588 dump_prec(st); |
0 | 1589 // Dump the outputs |
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1590 dump_out(st); |
0 | 1591 |
1592 if (is_disconnected(this)) { | |
1593 #ifdef ASSERT | |
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1594 st->print(" [%d]",debug_idx()); |
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1595 dump_orig(debug_orig(), st); |
0 | 1596 #endif |
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1597 st->cr(); |
0 | 1598 _in_dump_cnt--; |
1599 return; // don't process dead nodes | |
1600 } | |
1601 | |
1602 // Dump node-specific info | |
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1603 dump_spec(st); |
0 | 1604 #ifdef ASSERT |
1605 // Dump the non-reset _debug_idx | |
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1606 if (Verbose && WizardMode) { |
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1607 st->print(" [%d]",debug_idx()); |
0 | 1608 } |
1609 #endif | |
1610 | |
1611 const Type *t = bottom_type(); | |
1612 | |
1613 if (t != NULL && (t->isa_instptr() || t->isa_klassptr())) { | |
1614 const TypeInstPtr *toop = t->isa_instptr(); | |
1615 const TypeKlassPtr *tkls = t->isa_klassptr(); | |
1616 ciKlass* klass = toop ? toop->klass() : (tkls ? tkls->klass() : NULL ); | |
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1617 if (klass && klass->is_loaded() && klass->is_interface()) { |
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1618 st->print(" Interface:"); |
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1619 } else if (toop) { |
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1620 st->print(" Oop:"); |
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1621 } else if (tkls) { |
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1622 st->print(" Klass:"); |
0 | 1623 } |
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1624 t->dump_on(st); |
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1625 } else if (t == Type::MEMORY) { |
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1626 st->print(" Memory:"); |
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1627 MemNode::dump_adr_type(this, adr_type(), st); |
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1628 } else if (Verbose || WizardMode) { |
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1629 st->print(" Type:"); |
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1630 if (t) { |
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1631 t->dump_on(st); |
0 | 1632 } else { |
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1633 st->print("no type"); |
0 | 1634 } |
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1635 } else if (t->isa_vect() && this->is_MachSpillCopy()) { |
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1636 // Dump MachSpillcopy vector type. |
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1637 t->dump_on(st); |
0 | 1638 } |
1639 if (is_new) { | |
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1640 debug_only(dump_orig(debug_orig(), st)); |
0 | 1641 Node_Notes* nn = C->node_notes_at(_idx); |
1642 if (nn != NULL && !nn->is_clear()) { | |
1643 if (nn->jvms() != NULL) { | |
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1644 st->print(" !jvms:"); |
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1645 nn->jvms()->dump_spec(st); |
0 | 1646 } |
1647 } | |
1648 } | |
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1649 if (suffix) st->print(suffix); |
0 | 1650 _in_dump_cnt--; |
1651 } | |
1652 | |
1653 //------------------------------dump_req-------------------------------------- | |
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1654 void Node::dump_req(outputStream *st) const { |
0 | 1655 // Dump the required input edges |
1656 for (uint i = 0; i < req(); i++) { // For all required inputs | |
1657 Node* d = in(i); | |
1658 if (d == NULL) { | |
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1659 st->print("_ "); |
0 | 1660 } else if (NotANode(d)) { |
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1661 st->print("NotANode "); // uninitialized, sentinel, garbage, etc. |
0 | 1662 } else { |
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1663 st->print("%c%d ", Compile::current()->node_arena()->contains(d) ? ' ' : 'o', d->_idx); |
0 | 1664 } |
1665 } | |
1666 } | |
1667 | |
1668 | |
1669 //------------------------------dump_prec------------------------------------- | |
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1670 void Node::dump_prec(outputStream *st) const { |
0 | 1671 // Dump the precedence edges |
1672 int any_prec = 0; | |
1673 for (uint i = req(); i < len(); i++) { // For all precedence inputs | |
1674 Node* p = in(i); | |
1675 if (p != NULL) { | |
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1676 if (!any_prec++) st->print(" |"); |
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1677 if (NotANode(p)) { st->print("NotANode "); continue; } |
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1678 st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx); |
0 | 1679 } |
1680 } | |
1681 } | |
1682 | |
1683 //------------------------------dump_out-------------------------------------- | |
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1684 void Node::dump_out(outputStream *st) const { |
0 | 1685 // Delimit the output edges |
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1686 st->print(" [["); |
0 | 1687 // Dump the output edges |
1688 for (uint i = 0; i < _outcnt; i++) { // For all outputs | |
1689 Node* u = _out[i]; | |
1690 if (u == NULL) { | |
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1691 st->print("_ "); |
0 | 1692 } else if (NotANode(u)) { |
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1693 st->print("NotANode "); |
0 | 1694 } else { |
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1695 st->print("%c%d ", Compile::current()->node_arena()->contains(u) ? ' ' : 'o', u->_idx); |
0 | 1696 } |
1697 } | |
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1698 st->print("]] "); |
0 | 1699 } |
1700 | |
1701 //------------------------------dump_nodes------------------------------------- | |
1702 static void dump_nodes(const Node* start, int d, bool only_ctrl) { | |
1703 Node* s = (Node*)start; // remove const | |
1704 if (NotANode(s)) return; | |
1705 | |
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1706 uint depth = (uint)ABS(d); |
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1707 int direction = d; |
0 | 1708 Compile* C = Compile::current(); |
40 | 1709 GrowableArray <Node *> nstack(C->unique()); |
0 | 1710 |
40 | 1711 nstack.append(s); |
1712 int begin = 0; | |
1713 int end = 0; | |
1714 for(uint i = 0; i < depth; i++) { | |
1715 end = nstack.length(); | |
1716 for(int j = begin; j < end; j++) { | |
1717 Node* tp = nstack.at(j); | |
1718 uint limit = direction > 0 ? tp->len() : tp->outcnt(); | |
1719 for(uint k = 0; k < limit; k++) { | |
1720 Node* n = direction > 0 ? tp->in(k) : tp->raw_out(k); | |
0 | 1721 |
40 | 1722 if (NotANode(n)) continue; |
1723 // do not recurse through top or the root (would reach unrelated stuff) | |
1724 if (n->is_Root() || n->is_top()) continue; | |
1725 if (only_ctrl && !n->is_CFG()) continue; | |
0 | 1726 |
40 | 1727 bool on_stack = nstack.contains(n); |
1728 if (!on_stack) { | |
1729 nstack.append(n); | |
0 | 1730 } |
1731 } | |
1732 } | |
40 | 1733 begin = end; |
1734 } | |
1735 end = nstack.length(); | |
1736 if (direction > 0) { | |
1737 for(int j = end-1; j >= 0; j--) { | |
1738 nstack.at(j)->dump(); | |
1739 } | |
1740 } else { | |
1741 for(int j = 0; j < end; j++) { | |
1742 nstack.at(j)->dump(); | |
1743 } | |
0 | 1744 } |
1745 } | |
1746 | |
1747 //------------------------------dump------------------------------------------- | |
1748 void Node::dump(int d) const { | |
1749 dump_nodes(this, d, false); | |
1750 } | |
1751 | |
1752 //------------------------------dump_ctrl-------------------------------------- | |
1753 // Dump a Node's control history to depth | |
1754 void Node::dump_ctrl(int d) const { | |
1755 dump_nodes(this, d, true); | |
1756 } | |
1757 | |
1758 // VERIFICATION CODE | |
1759 // For each input edge to a node (ie - for each Use-Def edge), verify that | |
1760 // there is a corresponding Def-Use edge. | |
1761 //------------------------------verify_edges----------------------------------- | |
1762 void Node::verify_edges(Unique_Node_List &visited) { | |
1763 uint i, j, idx; | |
1764 int cnt; | |
1765 Node *n; | |
1766 | |
1767 // Recursive termination test | |
1768 if (visited.member(this)) return; | |
1769 visited.push(this); | |
1770 | |
605 | 1771 // Walk over all input edges, checking for correspondence |
0 | 1772 for( i = 0; i < len(); i++ ) { |
1773 n = in(i); | |
1774 if (n != NULL && !n->is_top()) { | |
1775 // Count instances of (Node *)this | |
1776 cnt = 0; | |
1777 for (idx = 0; idx < n->_outcnt; idx++ ) { | |
1778 if (n->_out[idx] == (Node *)this) cnt++; | |
1779 } | |
1780 assert( cnt > 0,"Failed to find Def-Use edge." ); | |
1781 // Check for duplicate edges | |
1782 // walk the input array downcounting the input edges to n | |
1783 for( j = 0; j < len(); j++ ) { | |
1784 if( in(j) == n ) cnt--; | |
1785 } | |
1786 assert( cnt == 0,"Mismatched edge count."); | |
1787 } else if (n == NULL) { | |
1788 assert(i >= req() || i == 0 || is_Region() || is_Phi(), "only regions or phis have null data edges"); | |
1789 } else { | |
1790 assert(n->is_top(), "sanity"); | |
1791 // Nothing to check. | |
1792 } | |
1793 } | |
1794 // Recursive walk over all input edges | |
1795 for( i = 0; i < len(); i++ ) { | |
1796 n = in(i); | |
1797 if( n != NULL ) | |
1798 in(i)->verify_edges(visited); | |
1799 } | |
1800 } | |
1801 | |
1802 //------------------------------verify_recur----------------------------------- | |
1803 static const Node *unique_top = NULL; | |
1804 | |
1805 void Node::verify_recur(const Node *n, int verify_depth, | |
1806 VectorSet &old_space, VectorSet &new_space) { | |
1807 if ( verify_depth == 0 ) return; | |
1808 if (verify_depth > 0) --verify_depth; | |
1809 | |
1810 Compile* C = Compile::current(); | |
1811 | |
1812 // Contained in new_space or old_space? | |
1813 VectorSet *v = C->node_arena()->contains(n) ? &new_space : &old_space; | |
1814 // Check for visited in the proper space. Numberings are not unique | |
605 | 1815 // across spaces so we need a separate VectorSet for each space. |
0 | 1816 if( v->test_set(n->_idx) ) return; |
1817 | |
1818 if (n->is_Con() && n->bottom_type() == Type::TOP) { | |
1819 if (C->cached_top_node() == NULL) | |
1820 C->set_cached_top_node((Node*)n); | |
1821 assert(C->cached_top_node() == n, "TOP node must be unique"); | |
1822 } | |
1823 | |
1824 for( uint i = 0; i < n->len(); i++ ) { | |
1825 Node *x = n->in(i); | |
1826 if (!x || x->is_top()) continue; | |
1827 | |
1828 // Verify my input has a def-use edge to me | |
1829 if (true /*VerifyDefUse*/) { | |
1830 // Count use-def edges from n to x | |
1831 int cnt = 0; | |
1832 for( uint j = 0; j < n->len(); j++ ) | |
1833 if( n->in(j) == x ) | |
1834 cnt++; | |
1835 // Count def-use edges from x to n | |
1836 uint max = x->_outcnt; | |
1837 for( uint k = 0; k < max; k++ ) | |
1838 if (x->_out[k] == n) | |
1839 cnt--; | |
1840 assert( cnt == 0, "mismatched def-use edge counts" ); | |
1841 } | |
1842 | |
1843 verify_recur(x, verify_depth, old_space, new_space); | |
1844 } | |
1845 | |
1846 } | |
1847 | |
1848 //------------------------------verify----------------------------------------- | |
1849 // Check Def-Use info for my subgraph | |
1850 void Node::verify() const { | |
1851 Compile* C = Compile::current(); | |
1852 Node* old_top = C->cached_top_node(); | |
1853 ResourceMark rm; | |
1854 ResourceArea *area = Thread::current()->resource_area(); | |
1855 VectorSet old_space(area), new_space(area); | |
1856 verify_recur(this, -1, old_space, new_space); | |
1857 C->set_cached_top_node(old_top); | |
1858 } | |
1859 #endif | |
1860 | |
1861 | |
1862 //------------------------------walk------------------------------------------- | |
1863 // Graph walk, with both pre-order and post-order functions | |
1864 void Node::walk(NFunc pre, NFunc post, void *env) { | |
1865 VectorSet visited(Thread::current()->resource_area()); // Setup for local walk | |
1866 walk_(pre, post, env, visited); | |
1867 } | |
1868 | |
1869 void Node::walk_(NFunc pre, NFunc post, void *env, VectorSet &visited) { | |
1870 if( visited.test_set(_idx) ) return; | |
1871 pre(*this,env); // Call the pre-order walk function | |
1872 for( uint i=0; i<_max; i++ ) | |
1873 if( in(i) ) // Input exists and is not walked? | |
1874 in(i)->walk_(pre,post,env,visited); // Walk it with pre & post functions | |
1875 post(*this,env); // Call the post-order walk function | |
1876 } | |
1877 | |
1878 void Node::nop(Node &, void*) {} | |
1879 | |
1880 //------------------------------Registers-------------------------------------- | |
1881 // Do we Match on this edge index or not? Generally false for Control | |
1882 // and true for everything else. Weird for calls & returns. | |
1883 uint Node::match_edge(uint idx) const { | |
1884 return idx; // True for other than index 0 (control) | |
1885 } | |
1886 | |
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1887 static RegMask _not_used_at_all; |
0 | 1888 // Register classes are defined for specific machines |
1889 const RegMask &Node::out_RegMask() const { | |
1890 ShouldNotCallThis(); | |
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1891 return _not_used_at_all; |
0 | 1892 } |
1893 | |
1894 const RegMask &Node::in_RegMask(uint) const { | |
1895 ShouldNotCallThis(); | |
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1896 return _not_used_at_all; |
0 | 1897 } |
1898 | |
1899 //============================================================================= | |
1900 //----------------------------------------------------------------------------- | |
1901 void Node_Array::reset( Arena *new_arena ) { | |
1902 _a->Afree(_nodes,_max*sizeof(Node*)); | |
1903 _max = 0; | |
1904 _nodes = NULL; | |
1905 _a = new_arena; | |
1906 } | |
1907 | |
1908 //------------------------------clear------------------------------------------ | |
1909 // Clear all entries in _nodes to NULL but keep storage | |
1910 void Node_Array::clear() { | |
1911 Copy::zero_to_bytes( _nodes, _max*sizeof(Node*) ); | |
1912 } | |
1913 | |
1914 //----------------------------------------------------------------------------- | |
1915 void Node_Array::grow( uint i ) { | |
1916 if( !_max ) { | |
1917 _max = 1; | |
1918 _nodes = (Node**)_a->Amalloc( _max * sizeof(Node*) ); | |
1919 _nodes[0] = NULL; | |
1920 } | |
1921 uint old = _max; | |
1922 while( i >= _max ) _max <<= 1; // Double to fit | |
1923 _nodes = (Node**)_a->Arealloc( _nodes, old*sizeof(Node*),_max*sizeof(Node*)); | |
1924 Copy::zero_to_bytes( &_nodes[old], (_max-old)*sizeof(Node*) ); | |
1925 } | |
1926 | |
1927 //----------------------------------------------------------------------------- | |
1928 void Node_Array::insert( uint i, Node *n ) { | |
1929 if( _nodes[_max-1] ) grow(_max); // Get more space if full | |
1930 Copy::conjoint_words_to_higher((HeapWord*)&_nodes[i], (HeapWord*)&_nodes[i+1], ((_max-i-1)*sizeof(Node*))); | |
1931 _nodes[i] = n; | |
1932 } | |
1933 | |
1934 //----------------------------------------------------------------------------- | |
1935 void Node_Array::remove( uint i ) { | |
1936 Copy::conjoint_words_to_lower((HeapWord*)&_nodes[i+1], (HeapWord*)&_nodes[i], ((_max-i-1)*sizeof(Node*))); | |
1937 _nodes[_max-1] = NULL; | |
1938 } | |
1939 | |
1940 //----------------------------------------------------------------------------- | |
1941 void Node_Array::sort( C_sort_func_t func) { | |
1942 qsort( _nodes, _max, sizeof( Node* ), func ); | |
1943 } | |
1944 | |
1945 //----------------------------------------------------------------------------- | |
1946 void Node_Array::dump() const { | |
1947 #ifndef PRODUCT | |
1948 for( uint i = 0; i < _max; i++ ) { | |
1949 Node *nn = _nodes[i]; | |
1950 if( nn != NULL ) { | |
1951 tty->print("%5d--> ",i); nn->dump(); | |
1952 } | |
1953 } | |
1954 #endif | |
1955 } | |
1956 | |
1957 //--------------------------is_iteratively_computed------------------------------ | |
1958 // Operation appears to be iteratively computed (such as an induction variable) | |
1959 // It is possible for this operation to return false for a loop-varying | |
1960 // value, if it appears (by local graph inspection) to be computed by a simple conditional. | |
1961 bool Node::is_iteratively_computed() { | |
1962 if (ideal_reg()) { // does operation have a result register? | |
1963 for (uint i = 1; i < req(); i++) { | |
1964 Node* n = in(i); | |
1965 if (n != NULL && n->is_Phi()) { | |
1966 for (uint j = 1; j < n->req(); j++) { | |
1967 if (n->in(j) == this) { | |
1968 return true; | |
1969 } | |
1970 } | |
1971 } | |
1972 } | |
1973 } | |
1974 return false; | |
1975 } | |
1976 | |
1977 //--------------------------find_similar------------------------------ | |
1978 // Return a node with opcode "opc" and same inputs as "this" if one can | |
1979 // be found; Otherwise return NULL; | |
1980 Node* Node::find_similar(int opc) { | |
1981 if (req() >= 2) { | |
1982 Node* def = in(1); | |
1983 if (def && def->outcnt() >= 2) { | |
1984 for (DUIterator_Fast dmax, i = def->fast_outs(dmax); i < dmax; i++) { | |
1985 Node* use = def->fast_out(i); | |
1986 if (use->Opcode() == opc && | |
1987 use->req() == req()) { | |
1988 uint j; | |
1989 for (j = 0; j < use->req(); j++) { | |
1990 if (use->in(j) != in(j)) { | |
1991 break; | |
1992 } | |
1993 } | |
1994 if (j == use->req()) { | |
1995 return use; | |
1996 } | |
1997 } | |
1998 } | |
1999 } | |
2000 } | |
2001 return NULL; | |
2002 } | |
2003 | |
2004 | |
2005 //--------------------------unique_ctrl_out------------------------------ | |
2006 // Return the unique control out if only one. Null if none or more than one. | |
2007 Node* Node::unique_ctrl_out() { | |
2008 Node* found = NULL; | |
2009 for (uint i = 0; i < outcnt(); i++) { | |
2010 Node* use = raw_out(i); | |
2011 if (use->is_CFG() && use != this) { | |
2012 if (found != NULL) return NULL; | |
2013 found = use; | |
2014 } | |
2015 } | |
2016 return found; | |
2017 } | |
2018 | |
2019 //============================================================================= | |
2020 //------------------------------yank------------------------------------------- | |
2021 // Find and remove | |
2022 void Node_List::yank( Node *n ) { | |
2023 uint i; | |
2024 for( i = 0; i < _cnt; i++ ) | |
2025 if( _nodes[i] == n ) | |
2026 break; | |
2027 | |
2028 if( i < _cnt ) | |
2029 _nodes[i] = _nodes[--_cnt]; | |
2030 } | |
2031 | |
2032 //------------------------------dump------------------------------------------- | |
2033 void Node_List::dump() const { | |
2034 #ifndef PRODUCT | |
2035 for( uint i = 0; i < _cnt; i++ ) | |
2036 if( _nodes[i] ) { | |
2037 tty->print("%5d--> ",i); | |
2038 _nodes[i]->dump(); | |
2039 } | |
2040 #endif | |
2041 } | |
2042 | |
2043 //============================================================================= | |
2044 //------------------------------remove----------------------------------------- | |
2045 void Unique_Node_List::remove( Node *n ) { | |
2046 if( _in_worklist[n->_idx] ) { | |
2047 for( uint i = 0; i < size(); i++ ) | |
2048 if( _nodes[i] == n ) { | |
2049 map(i,Node_List::pop()); | |
2050 _in_worklist >>= n->_idx; | |
2051 return; | |
2052 } | |
2053 ShouldNotReachHere(); | |
2054 } | |
2055 } | |
2056 | |
2057 //-----------------------remove_useless_nodes---------------------------------- | |
2058 // Remove useless nodes from worklist | |
2059 void Unique_Node_List::remove_useless_nodes(VectorSet &useful) { | |
2060 | |
2061 for( uint i = 0; i < size(); ++i ) { | |
2062 Node *n = at(i); | |
2063 assert( n != NULL, "Did not expect null entries in worklist"); | |
2064 if( ! useful.test(n->_idx) ) { | |
2065 _in_worklist >>= n->_idx; | |
2066 map(i,Node_List::pop()); | |
2067 // Node *replacement = Node_List::pop(); | |
2068 // if( i != size() ) { // Check if removing last entry | |
2069 // _nodes[i] = replacement; | |
2070 // } | |
2071 --i; // Visit popped node | |
2072 // If it was last entry, loop terminates since size() was also reduced | |
2073 } | |
2074 } | |
2075 } | |
2076 | |
2077 //============================================================================= | |
2078 void Node_Stack::grow() { | |
2079 size_t old_top = pointer_delta(_inode_top,_inodes,sizeof(INode)); // save _top | |
2080 size_t old_max = pointer_delta(_inode_max,_inodes,sizeof(INode)); | |
2081 size_t max = old_max << 1; // max * 2 | |
2082 _inodes = REALLOC_ARENA_ARRAY(_a, INode, _inodes, old_max, max); | |
2083 _inode_max = _inodes + max; | |
2084 _inode_top = _inodes + old_top; // restore _top | |
2085 } | |
2086 | |
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2087 // Node_Stack is used to map nodes. |
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2088 Node* Node_Stack::find(uint idx) const { |
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2089 uint sz = size(); |
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2090 for (uint i=0; i < sz; i++) { |
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2091 if (idx == index_at(i) ) |
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2092 return node_at(i); |
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2093 } |
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2094 return NULL; |
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2095 } |
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2096 |
0 | 2097 //============================================================================= |
2098 uint TypeNode::size_of() const { return sizeof(*this); } | |
2099 #ifndef PRODUCT | |
2100 void TypeNode::dump_spec(outputStream *st) const { | |
2101 if( !Verbose && !WizardMode ) { | |
2102 // standard dump does this in Verbose and WizardMode | |
2103 st->print(" #"); _type->dump_on(st); | |
2104 } | |
2105 } | |
2106 #endif | |
2107 uint TypeNode::hash() const { | |
2108 return Node::hash() + _type->hash(); | |
2109 } | |
2110 uint TypeNode::cmp( const Node &n ) const | |
2111 { return !Type::cmp( _type, ((TypeNode&)n)._type ); } | |
2112 const Type *TypeNode::bottom_type() const { return _type; } | |
2113 const Type *TypeNode::Value( PhaseTransform * ) const { return _type; } | |
2114 | |
2115 //------------------------------ideal_reg-------------------------------------- | |
2116 uint TypeNode::ideal_reg() const { | |
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2117 return _type->ideal_reg(); |
0 | 2118 } |