Mercurial > hg > graal-compiler
annotate src/share/vm/opto/node.cpp @ 20327:411e30e5fbb8
8026796: Make replace_in_map() on parent maps generic
Summary: propagate node replacements along control flow edges to callers
Reviewed-by: kvn, vlivanov
author | roland |
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date | Wed, 13 Aug 2014 11:00:22 +0200 |
parents | 78bbf4d43a14 |
children | 91cb3b8aac2b |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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" | |
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30 #include "opto/loopnode.hpp" |
1972 | 31 #include "opto/machnode.hpp" |
32 #include "opto/matcher.hpp" | |
33 #include "opto/node.hpp" | |
34 #include "opto/opcodes.hpp" | |
35 #include "opto/regmask.hpp" | |
36 #include "opto/type.hpp" | |
37 #include "utilities/copy.hpp" | |
0 | 38 |
39 class RegMask; | |
40 // #include "phase.hpp" | |
41 class PhaseTransform; | |
42 class PhaseGVN; | |
43 | |
44 // Arena we are currently building Nodes in | |
45 const uint Node::NotAMachineReg = 0xffff0000; | |
46 | |
47 #ifndef PRODUCT | |
48 extern int nodes_created; | |
49 #endif | |
50 | |
51 #ifdef ASSERT | |
52 | |
53 //-------------------------- construct_node------------------------------------ | |
54 // Set a breakpoint here to identify where a particular node index is built. | |
55 void Node::verify_construction() { | |
56 _debug_orig = NULL; | |
57 int old_debug_idx = Compile::debug_idx(); | |
58 int new_debug_idx = old_debug_idx+1; | |
59 if (new_debug_idx > 0) { | |
60 // Arrange that the lowest five decimal digits of _debug_idx | |
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61 // will repeat those of _idx. In case this is somehow pathological, |
0 | 62 // we continue to assign negative numbers (!) consecutively. |
63 const int mod = 100000; | |
64 int bump = (int)(_idx - new_debug_idx) % mod; | |
65 if (bump < 0) bump += mod; | |
66 assert(bump >= 0 && bump < mod, ""); | |
67 new_debug_idx += bump; | |
68 } | |
69 Compile::set_debug_idx(new_debug_idx); | |
70 set_debug_idx( new_debug_idx ); | |
10278 | 71 assert(Compile::current()->unique() < (INT_MAX - 1), "Node limit exceeded INT_MAX"); |
72 assert(Compile::current()->live_nodes() < (uint)MaxNodeLimit, "Live Node limit exceeded limit"); | |
0 | 73 if (BreakAtNode != 0 && (_debug_idx == BreakAtNode || (int)_idx == BreakAtNode)) { |
74 tty->print_cr("BreakAtNode: _idx=%d _debug_idx=%d", _idx, _debug_idx); | |
75 BREAKPOINT; | |
76 } | |
77 #if OPTO_DU_ITERATOR_ASSERT | |
78 _last_del = NULL; | |
79 _del_tick = 0; | |
80 #endif | |
81 _hash_lock = 0; | |
82 } | |
83 | |
84 | |
85 // #ifdef ASSERT ... | |
86 | |
87 #if OPTO_DU_ITERATOR_ASSERT | |
88 void DUIterator_Common::sample(const Node* node) { | |
89 _vdui = VerifyDUIterators; | |
90 _node = node; | |
91 _outcnt = node->_outcnt; | |
92 _del_tick = node->_del_tick; | |
93 _last = NULL; | |
94 } | |
95 | |
96 void DUIterator_Common::verify(const Node* node, bool at_end_ok) { | |
97 assert(_node == node, "consistent iterator source"); | |
98 assert(_del_tick == node->_del_tick, "no unexpected deletions allowed"); | |
99 } | |
100 | |
101 void DUIterator_Common::verify_resync() { | |
102 // Ensure that the loop body has just deleted the last guy produced. | |
103 const Node* node = _node; | |
104 // Ensure that at least one copy of the last-seen edge was deleted. | |
105 // Note: It is OK to delete multiple copies of the last-seen edge. | |
106 // Unfortunately, we have no way to verify that all the deletions delete | |
107 // that same edge. On this point we must use the Honor System. | |
108 assert(node->_del_tick >= _del_tick+1, "must have deleted an edge"); | |
109 assert(node->_last_del == _last, "must have deleted the edge just produced"); | |
110 // We liked this deletion, so accept the resulting outcnt and tick. | |
111 _outcnt = node->_outcnt; | |
112 _del_tick = node->_del_tick; | |
113 } | |
114 | |
115 void DUIterator_Common::reset(const DUIterator_Common& that) { | |
116 if (this == &that) return; // ignore assignment to self | |
117 if (!_vdui) { | |
118 // We need to initialize everything, overwriting garbage values. | |
119 _last = that._last; | |
120 _vdui = that._vdui; | |
121 } | |
122 // Note: It is legal (though odd) for an iterator over some node x | |
123 // to be reassigned to iterate over another node y. Some doubly-nested | |
124 // progress loops depend on being able to do this. | |
125 const Node* node = that._node; | |
126 // Re-initialize everything, except _last. | |
127 _node = node; | |
128 _outcnt = node->_outcnt; | |
129 _del_tick = node->_del_tick; | |
130 } | |
131 | |
132 void DUIterator::sample(const Node* node) { | |
133 DUIterator_Common::sample(node); // Initialize the assertion data. | |
134 _refresh_tick = 0; // No refreshes have happened, as yet. | |
135 } | |
136 | |
137 void DUIterator::verify(const Node* node, bool at_end_ok) { | |
138 DUIterator_Common::verify(node, at_end_ok); | |
139 assert(_idx < node->_outcnt + (uint)at_end_ok, "idx in range"); | |
140 } | |
141 | |
142 void DUIterator::verify_increment() { | |
143 if (_refresh_tick & 1) { | |
144 // We have refreshed the index during this loop. | |
145 // Fix up _idx to meet asserts. | |
146 if (_idx > _outcnt) _idx = _outcnt; | |
147 } | |
148 verify(_node, true); | |
149 } | |
150 | |
151 void DUIterator::verify_resync() { | |
152 // Note: We do not assert on _outcnt, because insertions are OK here. | |
153 DUIterator_Common::verify_resync(); | |
154 // Make sure we are still in sync, possibly with no more out-edges: | |
155 verify(_node, true); | |
156 } | |
157 | |
158 void DUIterator::reset(const DUIterator& that) { | |
159 if (this == &that) return; // self assignment is always a no-op | |
160 assert(that._refresh_tick == 0, "assign only the result of Node::outs()"); | |
161 assert(that._idx == 0, "assign only the result of Node::outs()"); | |
162 assert(_idx == that._idx, "already assigned _idx"); | |
163 if (!_vdui) { | |
164 // We need to initialize everything, overwriting garbage values. | |
165 sample(that._node); | |
166 } else { | |
167 DUIterator_Common::reset(that); | |
168 if (_refresh_tick & 1) { | |
169 _refresh_tick++; // Clear the "was refreshed" flag. | |
170 } | |
171 assert(_refresh_tick < 2*100000, "DU iteration must converge quickly"); | |
172 } | |
173 } | |
174 | |
175 void DUIterator::refresh() { | |
176 DUIterator_Common::sample(_node); // Re-fetch assertion data. | |
177 _refresh_tick |= 1; // Set the "was refreshed" flag. | |
178 } | |
179 | |
180 void DUIterator::verify_finish() { | |
181 // If the loop has killed the node, do not require it to re-run. | |
182 if (_node->_outcnt == 0) _refresh_tick &= ~1; | |
183 // If this assert triggers, it means that a loop used refresh_out_pos | |
184 // to re-synch an iteration index, but the loop did not correctly | |
185 // re-run itself, using a "while (progress)" construct. | |
186 // This iterator enforces the rule that you must keep trying the loop | |
187 // until it "runs clean" without any need for refreshing. | |
188 assert(!(_refresh_tick & 1), "the loop must run once with no refreshing"); | |
189 } | |
190 | |
191 | |
192 void DUIterator_Fast::verify(const Node* node, bool at_end_ok) { | |
193 DUIterator_Common::verify(node, at_end_ok); | |
194 Node** out = node->_out; | |
195 uint cnt = node->_outcnt; | |
196 assert(cnt == _outcnt, "no insertions allowed"); | |
197 assert(_outp >= out && _outp <= out + cnt - !at_end_ok, "outp in range"); | |
198 // This last check is carefully designed to work for NO_OUT_ARRAY. | |
199 } | |
200 | |
201 void DUIterator_Fast::verify_limit() { | |
202 const Node* node = _node; | |
203 verify(node, true); | |
204 assert(_outp == node->_out + node->_outcnt, "limit still correct"); | |
205 } | |
206 | |
207 void DUIterator_Fast::verify_resync() { | |
208 const Node* node = _node; | |
209 if (_outp == node->_out + _outcnt) { | |
210 // Note that the limit imax, not the pointer i, gets updated with the | |
211 // exact count of deletions. (For the pointer it's always "--i".) | |
212 assert(node->_outcnt+node->_del_tick == _outcnt+_del_tick, "no insertions allowed with deletion(s)"); | |
213 // This is a limit pointer, with a name like "imax". | |
214 // Fudge the _last field so that the common assert will be happy. | |
215 _last = (Node*) node->_last_del; | |
216 DUIterator_Common::verify_resync(); | |
217 } else { | |
218 assert(node->_outcnt < _outcnt, "no insertions allowed with deletion(s)"); | |
219 // A normal internal pointer. | |
220 DUIterator_Common::verify_resync(); | |
221 // Make sure we are still in sync, possibly with no more out-edges: | |
222 verify(node, true); | |
223 } | |
224 } | |
225 | |
226 void DUIterator_Fast::verify_relimit(uint n) { | |
227 const Node* node = _node; | |
228 assert((int)n > 0, "use imax -= n only with a positive count"); | |
229 // This must be a limit pointer, with a name like "imax". | |
230 assert(_outp == node->_out + node->_outcnt, "apply -= only to a limit (imax)"); | |
231 // The reported number of deletions must match what the node saw. | |
232 assert(node->_del_tick == _del_tick + n, "must have deleted n edges"); | |
233 // Fudge the _last field so that the common assert will be happy. | |
234 _last = (Node*) node->_last_del; | |
235 DUIterator_Common::verify_resync(); | |
236 } | |
237 | |
238 void DUIterator_Fast::reset(const DUIterator_Fast& that) { | |
239 assert(_outp == that._outp, "already assigned _outp"); | |
240 DUIterator_Common::reset(that); | |
241 } | |
242 | |
243 void DUIterator_Last::verify(const Node* node, bool at_end_ok) { | |
244 // at_end_ok means the _outp is allowed to underflow by 1 | |
245 _outp += at_end_ok; | |
246 DUIterator_Fast::verify(node, at_end_ok); // check _del_tick, etc. | |
247 _outp -= at_end_ok; | |
248 assert(_outp == (node->_out + node->_outcnt) - 1, "pointer must point to end of nodes"); | |
249 } | |
250 | |
251 void DUIterator_Last::verify_limit() { | |
252 // Do not require the limit address to be resynched. | |
253 //verify(node, true); | |
254 assert(_outp == _node->_out, "limit still correct"); | |
255 } | |
256 | |
257 void DUIterator_Last::verify_step(uint num_edges) { | |
258 assert((int)num_edges > 0, "need non-zero edge count for loop progress"); | |
259 _outcnt -= num_edges; | |
260 _del_tick += num_edges; | |
261 // Make sure we are still in sync, possibly with no more out-edges: | |
262 const Node* node = _node; | |
263 verify(node, true); | |
264 assert(node->_last_del == _last, "must have deleted the edge just produced"); | |
265 } | |
266 | |
267 #endif //OPTO_DU_ITERATOR_ASSERT | |
268 | |
269 | |
270 #endif //ASSERT | |
271 | |
272 | |
273 // This constant used to initialize _out may be any non-null value. | |
274 // The value NULL is reserved for the top node only. | |
275 #define NO_OUT_ARRAY ((Node**)-1) | |
276 | |
277 // This funny expression handshakes with Node::operator new | |
278 // to pull Compile::current out of the new node's _out field, | |
279 // and then calls a subroutine which manages most field | |
280 // initializations. The only one which is tricky is the | |
281 // _idx field, which is const, and so must be initialized | |
282 // by a return value, not an assignment. | |
283 // | |
284 // (Aren't you thankful that Java finals don't require so many tricks?) | |
285 #define IDX_INIT(req) this->Init((req), (Compile*) this->_out) | |
286 #ifdef _MSC_VER // the IDX_INIT hack falls foul of warning C4355 | |
287 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
288 #endif | |
289 | |
290 // Out-of-line code from node constructors. | |
291 // Executed only when extra debug info. is being passed around. | |
292 static void init_node_notes(Compile* C, int idx, Node_Notes* nn) { | |
293 C->set_node_notes_at(idx, nn); | |
294 } | |
295 | |
296 // Shared initialization code. | |
297 inline int Node::Init(int req, Compile* C) { | |
298 assert(Compile::current() == C, "must use operator new(Compile*)"); | |
299 int idx = C->next_unique(); | |
300 | |
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301 // Allocate memory for the necessary number of edges. |
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302 if (req > 0) { |
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303 // Allocate space for _in array to have double alignment. |
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304 _in = (Node **) ((char *) (C->node_arena()->Amalloc_D(req * sizeof(void*)))); |
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305 #ifdef ASSERT |
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306 _in[req-1] = this; // magic cookie for assertion check |
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307 #endif |
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308 } |
0 | 309 // If there are default notes floating around, capture them: |
310 Node_Notes* nn = C->default_node_notes(); | |
311 if (nn != NULL) init_node_notes(C, idx, nn); | |
312 | |
313 // Note: At this point, C is dead, | |
314 // and we begin to initialize the new Node. | |
315 | |
316 _cnt = _max = req; | |
317 _outcnt = _outmax = 0; | |
318 _class_id = Class_Node; | |
319 _flags = 0; | |
320 _out = NO_OUT_ARRAY; | |
321 return idx; | |
322 } | |
323 | |
324 //------------------------------Node------------------------------------------- | |
325 // Create a Node, with a given number of required edges. | |
326 Node::Node(uint req) | |
327 : _idx(IDX_INIT(req)) | |
328 { | |
329 assert( req < (uint)(MaxNodeLimit - NodeLimitFudgeFactor), "Input limit exceeded" ); | |
330 debug_only( verify_construction() ); | |
331 NOT_PRODUCT(nodes_created++); | |
332 if (req == 0) { | |
333 assert( _in == (Node**)this, "Must not pass arg count to 'new'" ); | |
334 _in = NULL; | |
335 } else { | |
336 assert( _in[req-1] == this, "Must pass arg count to 'new'" ); | |
337 Node** to = _in; | |
338 for(uint i = 0; i < req; i++) { | |
339 to[i] = NULL; | |
340 } | |
341 } | |
342 } | |
343 | |
344 //------------------------------Node------------------------------------------- | |
345 Node::Node(Node *n0) | |
346 : _idx(IDX_INIT(1)) | |
347 { | |
348 debug_only( verify_construction() ); | |
349 NOT_PRODUCT(nodes_created++); | |
350 // Assert we allocated space for input array already | |
351 assert( _in[0] == this, "Must pass arg count to 'new'" ); | |
352 assert( is_not_dead(n0), "can not use dead node"); | |
353 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
354 } | |
355 | |
356 //------------------------------Node------------------------------------------- | |
357 Node::Node(Node *n0, Node *n1) | |
358 : _idx(IDX_INIT(2)) | |
359 { | |
360 debug_only( verify_construction() ); | |
361 NOT_PRODUCT(nodes_created++); | |
362 // Assert we allocated space for input array already | |
363 assert( _in[1] == this, "Must pass arg count to 'new'" ); | |
364 assert( is_not_dead(n0), "can not use dead node"); | |
365 assert( is_not_dead(n1), "can not use dead node"); | |
366 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
367 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
368 } | |
369 | |
370 //------------------------------Node------------------------------------------- | |
371 Node::Node(Node *n0, Node *n1, Node *n2) | |
372 : _idx(IDX_INIT(3)) | |
373 { | |
374 debug_only( verify_construction() ); | |
375 NOT_PRODUCT(nodes_created++); | |
376 // Assert we allocated space for input array already | |
377 assert( _in[2] == this, "Must pass arg count to 'new'" ); | |
378 assert( is_not_dead(n0), "can not use dead node"); | |
379 assert( is_not_dead(n1), "can not use dead node"); | |
380 assert( is_not_dead(n2), "can not use dead node"); | |
381 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
382 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
383 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
384 } | |
385 | |
386 //------------------------------Node------------------------------------------- | |
387 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3) | |
388 : _idx(IDX_INIT(4)) | |
389 { | |
390 debug_only( verify_construction() ); | |
391 NOT_PRODUCT(nodes_created++); | |
392 // Assert we allocated space for input array already | |
393 assert( _in[3] == this, "Must pass arg count to 'new'" ); | |
394 assert( is_not_dead(n0), "can not use dead node"); | |
395 assert( is_not_dead(n1), "can not use dead node"); | |
396 assert( is_not_dead(n2), "can not use dead node"); | |
397 assert( is_not_dead(n3), "can not use dead node"); | |
398 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
399 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
400 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
401 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); | |
402 } | |
403 | |
404 //------------------------------Node------------------------------------------- | |
405 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3, Node *n4) | |
406 : _idx(IDX_INIT(5)) | |
407 { | |
408 debug_only( verify_construction() ); | |
409 NOT_PRODUCT(nodes_created++); | |
410 // Assert we allocated space for input array already | |
411 assert( _in[4] == this, "Must pass arg count to 'new'" ); | |
412 assert( is_not_dead(n0), "can not use dead node"); | |
413 assert( is_not_dead(n1), "can not use dead node"); | |
414 assert( is_not_dead(n2), "can not use dead node"); | |
415 assert( is_not_dead(n3), "can not use dead node"); | |
416 assert( is_not_dead(n4), "can not use dead node"); | |
417 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
418 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
419 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
420 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); | |
421 _in[4] = n4; if (n4 != NULL) n4->add_out((Node *)this); | |
422 } | |
423 | |
424 //------------------------------Node------------------------------------------- | |
425 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3, | |
426 Node *n4, Node *n5) | |
427 : _idx(IDX_INIT(6)) | |
428 { | |
429 debug_only( verify_construction() ); | |
430 NOT_PRODUCT(nodes_created++); | |
431 // Assert we allocated space for input array already | |
432 assert( _in[5] == this, "Must pass arg count to 'new'" ); | |
433 assert( is_not_dead(n0), "can not use dead node"); | |
434 assert( is_not_dead(n1), "can not use dead node"); | |
435 assert( is_not_dead(n2), "can not use dead node"); | |
436 assert( is_not_dead(n3), "can not use dead node"); | |
437 assert( is_not_dead(n4), "can not use dead node"); | |
438 assert( is_not_dead(n5), "can not use dead node"); | |
439 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
440 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
441 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
442 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); | |
443 _in[4] = n4; if (n4 != NULL) n4->add_out((Node *)this); | |
444 _in[5] = n5; if (n5 != NULL) n5->add_out((Node *)this); | |
445 } | |
446 | |
447 //------------------------------Node------------------------------------------- | |
448 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3, | |
449 Node *n4, Node *n5, Node *n6) | |
450 : _idx(IDX_INIT(7)) | |
451 { | |
452 debug_only( verify_construction() ); | |
453 NOT_PRODUCT(nodes_created++); | |
454 // Assert we allocated space for input array already | |
455 assert( _in[6] == this, "Must pass arg count to 'new'" ); | |
456 assert( is_not_dead(n0), "can not use dead node"); | |
457 assert( is_not_dead(n1), "can not use dead node"); | |
458 assert( is_not_dead(n2), "can not use dead node"); | |
459 assert( is_not_dead(n3), "can not use dead node"); | |
460 assert( is_not_dead(n4), "can not use dead node"); | |
461 assert( is_not_dead(n5), "can not use dead node"); | |
462 assert( is_not_dead(n6), "can not use dead node"); | |
463 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
464 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
465 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
466 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); | |
467 _in[4] = n4; if (n4 != NULL) n4->add_out((Node *)this); | |
468 _in[5] = n5; if (n5 != NULL) n5->add_out((Node *)this); | |
469 _in[6] = n6; if (n6 != NULL) n6->add_out((Node *)this); | |
470 } | |
471 | |
472 | |
473 //------------------------------clone------------------------------------------ | |
474 // Clone a Node. | |
475 Node *Node::clone() const { | |
10278 | 476 Compile* C = Compile::current(); |
0 | 477 uint s = size_of(); // Size of inherited Node |
10278 | 478 Node *n = (Node*)C->node_arena()->Amalloc_D(size_of() + _max*sizeof(Node*)); |
0 | 479 Copy::conjoint_words_to_lower((HeapWord*)this, (HeapWord*)n, s); |
480 // Set the new input pointer array | |
481 n->_in = (Node**)(((char*)n)+s); | |
482 // Cannot share the old output pointer array, so kill it | |
483 n->_out = NO_OUT_ARRAY; | |
484 // And reset the counters to 0 | |
485 n->_outcnt = 0; | |
486 n->_outmax = 0; | |
487 // Unlock this guy, since he is not in any hash table. | |
488 debug_only(n->_hash_lock = 0); | |
489 // Walk the old node's input list to duplicate its edges | |
490 uint i; | |
491 for( i = 0; i < len(); i++ ) { | |
492 Node *x = in(i); | |
493 n->_in[i] = x; | |
494 if (x != NULL) x->add_out(n); | |
495 } | |
496 if (is_macro()) | |
10278 | 497 C->add_macro_node(n); |
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498 if (is_expensive()) |
10278 | 499 C->add_expensive_node(n); |
0 | 500 |
10278 | 501 n->set_idx(C->next_unique()); // Get new unique index as well |
0 | 502 debug_only( n->verify_construction() ); |
503 NOT_PRODUCT(nodes_created++); | |
504 // Do not patch over the debug_idx of a clone, because it makes it | |
505 // impossible to break on the clone's moment of creation. | |
506 //debug_only( n->set_debug_idx( debug_idx() ) ); | |
507 | |
10278 | 508 C->copy_node_notes_to(n, (Node*) this); |
0 | 509 |
510 // MachNode clone | |
511 uint nopnds; | |
512 if (this->is_Mach() && (nopnds = this->as_Mach()->num_opnds()) > 0) { | |
513 MachNode *mach = n->as_Mach(); | |
514 MachNode *mthis = this->as_Mach(); | |
515 // Get address of _opnd_array. | |
516 // It should be the same offset since it is the clone of this node. | |
517 MachOper **from = mthis->_opnds; | |
518 MachOper **to = (MachOper **)((size_t)(&mach->_opnds) + | |
519 pointer_delta((const void*)from, | |
520 (const void*)(&mthis->_opnds), 1)); | |
521 mach->_opnds = to; | |
522 for ( uint i = 0; i < nopnds; ++i ) { | |
10278 | 523 to[i] = from[i]->clone(C); |
0 | 524 } |
525 } | |
526 // cloning CallNode may need to clone JVMState | |
527 if (n->is_Call()) { | |
10278 | 528 n->as_Call()->clone_jvms(C); |
0 | 529 } |
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530 if (n->is_SafePoint()) { |
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531 n->as_SafePoint()->clone_replaced_nodes(); |
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532 } |
0 | 533 return n; // Return the clone |
534 } | |
535 | |
536 //---------------------------setup_is_top-------------------------------------- | |
537 // Call this when changing the top node, to reassert the invariants | |
538 // required by Node::is_top. See Compile::set_cached_top_node. | |
539 void Node::setup_is_top() { | |
540 if (this == (Node*)Compile::current()->top()) { | |
541 // This node has just become top. Kill its out array. | |
542 _outcnt = _outmax = 0; | |
543 _out = NULL; // marker value for top | |
544 assert(is_top(), "must be top"); | |
545 } else { | |
546 if (_out == NULL) _out = NO_OUT_ARRAY; | |
547 assert(!is_top(), "must not be top"); | |
548 } | |
549 } | |
550 | |
551 | |
552 //------------------------------~Node------------------------------------------ | |
553 // Fancy destructor; eagerly attempt to reclaim Node numberings and storage | |
554 extern int reclaim_idx ; | |
555 extern int reclaim_in ; | |
556 extern int reclaim_node; | |
557 void Node::destruct() { | |
558 // Eagerly reclaim unique Node numberings | |
559 Compile* compile = Compile::current(); | |
560 if ((uint)_idx+1 == compile->unique()) { | |
561 compile->set_unique(compile->unique()-1); | |
562 #ifdef ASSERT | |
563 reclaim_idx++; | |
564 #endif | |
565 } | |
566 // Clear debug info: | |
567 Node_Notes* nn = compile->node_notes_at(_idx); | |
568 if (nn != NULL) nn->clear(); | |
569 // Walk the input array, freeing the corresponding output edges | |
570 _cnt = _max; // forget req/prec distinction | |
571 uint i; | |
572 for( i = 0; i < _max; i++ ) { | |
573 set_req(i, NULL); | |
574 //assert(def->out(def->outcnt()-1) == (Node *)this,"bad def-use hacking in reclaim"); | |
575 } | |
576 assert(outcnt() == 0, "deleting a node must not leave a dangling use"); | |
577 // See if the input array was allocated just prior to the object | |
578 int edge_size = _max*sizeof(void*); | |
579 int out_edge_size = _outmax*sizeof(void*); | |
580 char *edge_end = ((char*)_in) + edge_size; | |
581 char *out_array = (char*)(_out == NO_OUT_ARRAY? NULL: _out); | |
582 char *out_edge_end = out_array + out_edge_size; | |
583 int node_size = size_of(); | |
584 | |
585 // Free the output edge array | |
586 if (out_edge_size > 0) { | |
587 #ifdef ASSERT | |
588 if( out_edge_end == compile->node_arena()->hwm() ) | |
589 reclaim_in += out_edge_size; // count reclaimed out edges with in edges | |
590 #endif | |
591 compile->node_arena()->Afree(out_array, out_edge_size); | |
592 } | |
593 | |
594 // Free the input edge array and the node itself | |
595 if( edge_end == (char*)this ) { | |
596 #ifdef ASSERT | |
597 if( edge_end+node_size == compile->node_arena()->hwm() ) { | |
598 reclaim_in += edge_size; | |
599 reclaim_node+= node_size; | |
600 } | |
601 #else | |
602 // It was; free the input array and object all in one hit | |
603 compile->node_arena()->Afree(_in,edge_size+node_size); | |
604 #endif | |
605 } else { | |
606 | |
607 // Free just the input array | |
608 #ifdef ASSERT | |
609 if( edge_end == compile->node_arena()->hwm() ) | |
610 reclaim_in += edge_size; | |
611 #endif | |
612 compile->node_arena()->Afree(_in,edge_size); | |
613 | |
614 // Free just the object | |
615 #ifdef ASSERT | |
616 if( ((char*)this) + node_size == compile->node_arena()->hwm() ) | |
617 reclaim_node+= node_size; | |
618 #else | |
619 compile->node_arena()->Afree(this,node_size); | |
620 #endif | |
621 } | |
622 if (is_macro()) { | |
623 compile->remove_macro_node(this); | |
624 } | |
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625 if (is_expensive()) { |
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626 compile->remove_expensive_node(this); |
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627 } |
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628 if (is_SafePoint()) { |
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629 as_SafePoint()->delete_replaced_nodes(); |
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630 } |
0 | 631 #ifdef ASSERT |
632 // We will not actually delete the storage, but we'll make the node unusable. | |
633 *(address*)this = badAddress; // smash the C++ vtbl, probably | |
634 _in = _out = (Node**) badAddress; | |
635 _max = _cnt = _outmax = _outcnt = 0; | |
636 #endif | |
637 } | |
638 | |
639 //------------------------------grow------------------------------------------- | |
640 // Grow the input array, making space for more edges | |
641 void Node::grow( uint len ) { | |
642 Arena* arena = Compile::current()->node_arena(); | |
643 uint new_max = _max; | |
644 if( new_max == 0 ) { | |
645 _max = 4; | |
646 _in = (Node**)arena->Amalloc(4*sizeof(Node*)); | |
647 Node** to = _in; | |
648 to[0] = NULL; | |
649 to[1] = NULL; | |
650 to[2] = NULL; | |
651 to[3] = NULL; | |
652 return; | |
653 } | |
654 while( new_max <= len ) new_max <<= 1; // Find next power-of-2 | |
655 // Trimming to limit allows a uint8 to handle up to 255 edges. | |
656 // Previously I was using only powers-of-2 which peaked at 128 edges. | |
657 //if( new_max >= limit ) new_max = limit-1; | |
658 _in = (Node**)arena->Arealloc(_in, _max*sizeof(Node*), new_max*sizeof(Node*)); | |
659 Copy::zero_to_bytes(&_in[_max], (new_max-_max)*sizeof(Node*)); // NULL all new space | |
660 _max = new_max; // Record new max length | |
661 // This assertion makes sure that Node::_max is wide enough to | |
662 // represent the numerical value of new_max. | |
663 assert(_max == new_max && _max > len, "int width of _max is too small"); | |
664 } | |
665 | |
666 //-----------------------------out_grow---------------------------------------- | |
667 // Grow the input array, making space for more edges | |
668 void Node::out_grow( uint len ) { | |
669 assert(!is_top(), "cannot grow a top node's out array"); | |
670 Arena* arena = Compile::current()->node_arena(); | |
671 uint new_max = _outmax; | |
672 if( new_max == 0 ) { | |
673 _outmax = 4; | |
674 _out = (Node **)arena->Amalloc(4*sizeof(Node*)); | |
675 return; | |
676 } | |
677 while( new_max <= len ) new_max <<= 1; // Find next power-of-2 | |
678 // Trimming to limit allows a uint8 to handle up to 255 edges. | |
679 // Previously I was using only powers-of-2 which peaked at 128 edges. | |
680 //if( new_max >= limit ) new_max = limit-1; | |
681 assert(_out != NULL && _out != NO_OUT_ARRAY, "out must have sensible value"); | |
682 _out = (Node**)arena->Arealloc(_out,_outmax*sizeof(Node*),new_max*sizeof(Node*)); | |
683 //Copy::zero_to_bytes(&_out[_outmax], (new_max-_outmax)*sizeof(Node*)); // NULL all new space | |
684 _outmax = new_max; // Record new max length | |
685 // This assertion makes sure that Node::_max is wide enough to | |
686 // represent the numerical value of new_max. | |
687 assert(_outmax == new_max && _outmax > len, "int width of _outmax is too small"); | |
688 } | |
689 | |
690 #ifdef ASSERT | |
691 //------------------------------is_dead---------------------------------------- | |
692 bool Node::is_dead() const { | |
693 // Mach and pinch point nodes may look like dead. | |
694 if( is_top() || is_Mach() || (Opcode() == Op_Node && _outcnt > 0) ) | |
695 return false; | |
696 for( uint i = 0; i < _max; i++ ) | |
697 if( _in[i] != NULL ) | |
698 return false; | |
699 dump(); | |
700 return true; | |
701 } | |
702 #endif | |
703 | |
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704 |
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705 //------------------------------is_unreachable--------------------------------- |
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706 bool Node::is_unreachable(PhaseIterGVN &igvn) const { |
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707 assert(!is_Mach(), "doesn't work with MachNodes"); |
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708 return outcnt() == 0 || igvn.type(this) == Type::TOP || in(0)->is_top(); |
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709 } |
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710 |
0 | 711 //------------------------------add_req---------------------------------------- |
712 // Add a new required input at the end | |
713 void Node::add_req( Node *n ) { | |
714 assert( is_not_dead(n), "can not use dead node"); | |
715 | |
716 // Look to see if I can move precedence down one without reallocating | |
717 if( (_cnt >= _max) || (in(_max-1) != NULL) ) | |
718 grow( _max+1 ); | |
719 | |
720 // Find a precedence edge to move | |
721 if( in(_cnt) != NULL ) { // Next precedence edge is busy? | |
722 uint i; | |
723 for( i=_cnt; i<_max; i++ ) | |
724 if( in(i) == NULL ) // Find the NULL at end of prec edge list | |
725 break; // There must be one, since we grew the array | |
726 _in[i] = in(_cnt); // Move prec over, making space for req edge | |
727 } | |
728 _in[_cnt++] = n; // Stuff over old prec edge | |
729 if (n != NULL) n->add_out((Node *)this); | |
730 } | |
731 | |
732 //---------------------------add_req_batch------------------------------------- | |
733 // Add a new required input at the end | |
734 void Node::add_req_batch( Node *n, uint m ) { | |
735 assert( is_not_dead(n), "can not use dead node"); | |
736 // check various edge cases | |
737 if ((int)m <= 1) { | |
738 assert((int)m >= 0, "oob"); | |
739 if (m != 0) add_req(n); | |
740 return; | |
741 } | |
742 | |
743 // Look to see if I can move precedence down one without reallocating | |
744 if( (_cnt+m) > _max || _in[_max-m] ) | |
745 grow( _max+m ); | |
746 | |
747 // Find a precedence edge to move | |
748 if( _in[_cnt] != NULL ) { // Next precedence edge is busy? | |
749 uint i; | |
750 for( i=_cnt; i<_max; i++ ) | |
751 if( _in[i] == NULL ) // Find the NULL at end of prec edge list | |
752 break; // There must be one, since we grew the array | |
753 // Slide all the precs over by m positions (assume #prec << m). | |
754 Copy::conjoint_words_to_higher((HeapWord*)&_in[_cnt], (HeapWord*)&_in[_cnt+m], ((i-_cnt)*sizeof(Node*))); | |
755 } | |
756 | |
757 // Stuff over the old prec edges | |
758 for(uint i=0; i<m; i++ ) { | |
759 _in[_cnt++] = n; | |
760 } | |
761 | |
762 // Insert multiple out edges on the node. | |
763 if (n != NULL && !n->is_top()) { | |
764 for(uint i=0; i<m; i++ ) { | |
765 n->add_out((Node *)this); | |
766 } | |
767 } | |
768 } | |
769 | |
770 //------------------------------del_req---------------------------------------- | |
771 // Delete the required edge and compact the edge array | |
772 void Node::del_req( uint idx ) { | |
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773 assert( idx < _cnt, "oob"); |
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774 assert( !VerifyHashTableKeys || _hash_lock == 0, |
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775 "remove node from hash table before modifying it"); |
0 | 776 // First remove corresponding def-use edge |
777 Node *n = in(idx); | |
778 if (n != NULL) n->del_out((Node *)this); | |
779 _in[idx] = in(--_cnt); // Compact the array | |
780 _in[_cnt] = NULL; // NULL out emptied slot | |
781 } | |
782 | |
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783 //------------------------------del_req_ordered-------------------------------- |
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784 // Delete the required edge and compact the edge array with preserved order |
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785 void Node::del_req_ordered( uint idx ) { |
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786 assert( idx < _cnt, "oob"); |
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787 assert( !VerifyHashTableKeys || _hash_lock == 0, |
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788 "remove node from hash table before modifying it"); |
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789 // First remove corresponding def-use edge |
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790 Node *n = in(idx); |
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791 if (n != NULL) n->del_out((Node *)this); |
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792 if (idx < _cnt - 1) { // Not last edge ? |
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793 Copy::conjoint_words_to_lower((HeapWord*)&_in[idx+1], (HeapWord*)&_in[idx], ((_cnt-idx-1)*sizeof(Node*))); |
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794 } |
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795 _in[--_cnt] = NULL; // NULL out emptied slot |
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796 } |
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797 |
0 | 798 //------------------------------ins_req---------------------------------------- |
799 // Insert a new required input at the end | |
800 void Node::ins_req( uint idx, Node *n ) { | |
801 assert( is_not_dead(n), "can not use dead node"); | |
802 add_req(NULL); // Make space | |
803 assert( idx < _max, "Must have allocated enough space"); | |
804 // Slide over | |
805 if(_cnt-idx-1 > 0) { | |
806 Copy::conjoint_words_to_higher((HeapWord*)&_in[idx], (HeapWord*)&_in[idx+1], ((_cnt-idx-1)*sizeof(Node*))); | |
807 } | |
808 _in[idx] = n; // Stuff over old required edge | |
809 if (n != NULL) n->add_out((Node *)this); // Add reciprocal def-use edge | |
810 } | |
811 | |
812 //-----------------------------find_edge--------------------------------------- | |
813 int Node::find_edge(Node* n) { | |
814 for (uint i = 0; i < len(); i++) { | |
815 if (_in[i] == n) return i; | |
816 } | |
817 return -1; | |
818 } | |
819 | |
820 //----------------------------replace_edge------------------------------------- | |
821 int Node::replace_edge(Node* old, Node* neww) { | |
822 if (old == neww) return 0; // nothing to do | |
823 uint nrep = 0; | |
824 for (uint i = 0; i < len(); i++) { | |
825 if (in(i) == old) { | |
826 if (i < req()) | |
827 set_req(i, neww); | |
828 else | |
829 set_prec(i, neww); | |
830 nrep++; | |
831 } | |
832 } | |
833 return nrep; | |
834 } | |
835 | |
10278 | 836 /** |
837 * Replace input edges in the range pointing to 'old' node. | |
838 */ | |
839 int Node::replace_edges_in_range(Node* old, Node* neww, int start, int end) { | |
840 if (old == neww) return 0; // nothing to do | |
841 uint nrep = 0; | |
842 for (int i = start; i < end; i++) { | |
843 if (in(i) == old) { | |
844 set_req(i, neww); | |
845 nrep++; | |
846 } | |
847 } | |
848 return nrep; | |
849 } | |
850 | |
0 | 851 //-------------------------disconnect_inputs----------------------------------- |
852 // NULL out all inputs to eliminate incoming Def-Use edges. | |
853 // Return the number of edges between 'n' and 'this' | |
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854 int Node::disconnect_inputs(Node *n, Compile* C) { |
0 | 855 int edges_to_n = 0; |
856 | |
857 uint cnt = req(); | |
858 for( uint i = 0; i < cnt; ++i ) { | |
859 if( in(i) == 0 ) continue; | |
860 if( in(i) == n ) ++edges_to_n; | |
861 set_req(i, NULL); | |
862 } | |
863 // Remove precedence edges if any exist | |
864 // Note: Safepoints may have precedence edges, even during parsing | |
865 if( (req() != len()) && (in(req()) != NULL) ) { | |
866 uint max = len(); | |
867 for( uint i = 0; i < max; ++i ) { | |
868 if( in(i) == 0 ) continue; | |
869 if( in(i) == n ) ++edges_to_n; | |
870 set_prec(i, NULL); | |
871 } | |
872 } | |
873 | |
874 // Node::destruct requires all out edges be deleted first | |
875 // debug_only(destruct();) // no reuse benefit expected | |
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876 if (edges_to_n == 0) { |
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877 C->record_dead_node(_idx); |
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878 } |
0 | 879 return edges_to_n; |
880 } | |
881 | |
882 //-----------------------------uncast--------------------------------------- | |
883 // %%% Temporary, until we sort out CheckCastPP vs. CastPP. | |
884 // Strip away casting. (It is depth-limited.) | |
885 Node* Node::uncast() const { | |
886 // Should be inline: | |
887 //return is_ConstraintCast() ? uncast_helper(this) : (Node*) this; | |
65 | 888 if (is_ConstraintCast() || is_CheckCastPP()) |
0 | 889 return uncast_helper(this); |
890 else | |
891 return (Node*) this; | |
892 } | |
893 | |
894 //---------------------------uncast_helper------------------------------------- | |
895 Node* Node::uncast_helper(const Node* p) { | |
4778 | 896 #ifdef ASSERT |
897 uint depth_count = 0; | |
898 const Node* orig_p = p; | |
899 #endif | |
900 | |
901 while (true) { | |
902 #ifdef ASSERT | |
903 if (depth_count >= K) { | |
904 orig_p->dump(4); | |
905 if (p != orig_p) | |
906 p->dump(1); | |
907 } | |
908 assert(depth_count++ < K, "infinite loop in Node::uncast_helper"); | |
909 #endif | |
0 | 910 if (p == NULL || p->req() != 2) { |
911 break; | |
912 } else if (p->is_ConstraintCast()) { | |
913 p = p->in(1); | |
65 | 914 } else if (p->is_CheckCastPP()) { |
0 | 915 p = p->in(1); |
916 } else { | |
917 break; | |
918 } | |
919 } | |
920 return (Node*) p; | |
921 } | |
922 | |
923 //------------------------------add_prec--------------------------------------- | |
924 // Add a new precedence input. Precedence inputs are unordered, with | |
925 // duplicates removed and NULLs packed down at the end. | |
926 void Node::add_prec( Node *n ) { | |
927 assert( is_not_dead(n), "can not use dead node"); | |
928 | |
929 // Check for NULL at end | |
930 if( _cnt >= _max || in(_max-1) ) | |
931 grow( _max+1 ); | |
932 | |
933 // Find a precedence edge to move | |
934 uint i = _cnt; | |
935 while( in(i) != NULL ) i++; | |
936 _in[i] = n; // Stuff prec edge over NULL | |
937 if ( n != NULL) n->add_out((Node *)this); // Add mirror edge | |
938 } | |
939 | |
940 //------------------------------rm_prec---------------------------------------- | |
941 // Remove a precedence input. Precedence inputs are unordered, with | |
942 // duplicates removed and NULLs packed down at the end. | |
943 void Node::rm_prec( uint j ) { | |
944 | |
945 // Find end of precedence list to pack NULLs | |
946 uint i; | |
947 for( i=j; i<_max; i++ ) | |
948 if( !_in[i] ) // Find the NULL at end of prec edge list | |
949 break; | |
950 if (_in[j] != NULL) _in[j]->del_out((Node *)this); | |
951 _in[j] = _in[--i]; // Move last element over removed guy | |
952 _in[i] = NULL; // NULL out last element | |
953 } | |
954 | |
955 //------------------------------size_of---------------------------------------- | |
956 uint Node::size_of() const { return sizeof(*this); } | |
957 | |
958 //------------------------------ideal_reg-------------------------------------- | |
959 uint Node::ideal_reg() const { return 0; } | |
960 | |
961 //------------------------------jvms------------------------------------------- | |
962 JVMState* Node::jvms() const { return NULL; } | |
963 | |
964 #ifdef ASSERT | |
965 //------------------------------jvms------------------------------------------- | |
966 bool Node::verify_jvms(const JVMState* using_jvms) const { | |
967 for (JVMState* jvms = this->jvms(); jvms != NULL; jvms = jvms->caller()) { | |
968 if (jvms == using_jvms) return true; | |
969 } | |
970 return false; | |
971 } | |
972 | |
973 //------------------------------init_NodeProperty------------------------------ | |
974 void Node::init_NodeProperty() { | |
975 assert(_max_classes <= max_jushort, "too many NodeProperty classes"); | |
976 assert(_max_flags <= max_jushort, "too many NodeProperty flags"); | |
977 } | |
978 #endif | |
979 | |
980 //------------------------------format----------------------------------------- | |
981 // Print as assembly | |
982 void Node::format( PhaseRegAlloc *, outputStream *st ) const {} | |
983 //------------------------------emit------------------------------------------- | |
984 // Emit bytes starting at parameter 'ptr'. | |
985 void Node::emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const {} | |
986 //------------------------------size------------------------------------------- | |
987 // Size of instruction in bytes | |
988 uint Node::size(PhaseRegAlloc *ra_) const { return 0; } | |
989 | |
990 //------------------------------CFG Construction------------------------------- | |
991 // Nodes that end basic blocks, e.g. IfTrue/IfFalse, JumpProjNode, Root, | |
992 // Goto and Return. | |
993 const Node *Node::is_block_proj() const { return 0; } | |
994 | |
995 // Minimum guaranteed type | |
996 const Type *Node::bottom_type() const { return Type::BOTTOM; } | |
997 | |
998 | |
999 //------------------------------raise_bottom_type------------------------------ | |
1000 // Get the worst-case Type output for this Node. | |
1001 void Node::raise_bottom_type(const Type* new_type) { | |
1002 if (is_Type()) { | |
1003 TypeNode *n = this->as_Type(); | |
1004 if (VerifyAliases) { | |
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1005 assert(new_type->higher_equal_speculative(n->type()), "new type must refine old type"); |
0 | 1006 } |
1007 n->set_type(new_type); | |
1008 } else if (is_Load()) { | |
1009 LoadNode *n = this->as_Load(); | |
1010 if (VerifyAliases) { | |
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1011 assert(new_type->higher_equal_speculative(n->type()), "new type must refine old type"); |
0 | 1012 } |
1013 n->set_type(new_type); | |
1014 } | |
1015 } | |
1016 | |
1017 //------------------------------Identity--------------------------------------- | |
1018 // Return a node that the given node is equivalent to. | |
1019 Node *Node::Identity( PhaseTransform * ) { | |
1020 return this; // Default to no identities | |
1021 } | |
1022 | |
1023 //------------------------------Value------------------------------------------ | |
1024 // Compute a new Type for a node using the Type of the inputs. | |
1025 const Type *Node::Value( PhaseTransform * ) const { | |
1026 return bottom_type(); // Default to worst-case Type | |
1027 } | |
1028 | |
1029 //------------------------------Ideal------------------------------------------ | |
1030 // | |
1031 // 'Idealize' the graph rooted at this Node. | |
1032 // | |
1033 // In order to be efficient and flexible there are some subtle invariants | |
1034 // these Ideal calls need to hold. Running with '+VerifyIterativeGVN' checks | |
1035 // these invariants, although its too slow to have on by default. If you are | |
1036 // hacking an Ideal call, be sure to test with +VerifyIterativeGVN! | |
1037 // | |
1038 // The Ideal call almost arbitrarily reshape the graph rooted at the 'this' | |
1039 // pointer. If ANY change is made, it must return the root of the reshaped | |
1040 // graph - even if the root is the same Node. Example: swapping the inputs | |
1041 // to an AddINode gives the same answer and same root, but you still have to | |
1042 // return the 'this' pointer instead of NULL. | |
1043 // | |
1044 // You cannot return an OLD Node, except for the 'this' pointer. Use the | |
1045 // Identity call to return an old Node; basically if Identity can find | |
1046 // another Node have the Ideal call make no change and return NULL. | |
1047 // Example: AddINode::Ideal must check for add of zero; in this case it | |
1048 // returns NULL instead of doing any graph reshaping. | |
1049 // | |
1050 // You cannot modify any old Nodes except for the 'this' pointer. Due to | |
1051 // sharing there may be other users of the old Nodes relying on their current | |
1052 // semantics. Modifying them will break the other users. | |
1053 // Example: when reshape "(X+3)+4" into "X+7" you must leave the Node for | |
1054 // "X+3" unchanged in case it is shared. | |
1055 // | |
605 | 1056 // If you modify the 'this' pointer's inputs, you should use |
1057 // 'set_req'. If you are making a new Node (either as the new root or | |
1058 // some new internal piece) you may use 'init_req' to set the initial | |
1059 // value. You can make a new Node with either 'new' or 'clone'. In | |
1060 // either case, def-use info is correctly maintained. | |
1061 // | |
0 | 1062 // Example: reshape "(X+3)+4" into "X+7": |
605 | 1063 // set_req(1, in(1)->in(1)); |
1064 // set_req(2, phase->intcon(7)); | |
0 | 1065 // return this; |
605 | 1066 // Example: reshape "X*4" into "X<<2" |
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1067 // return new (C) LShiftINode(in(1), phase->intcon(2)); |
0 | 1068 // |
1069 // You must call 'phase->transform(X)' on any new Nodes X you make, except | |
605 | 1070 // for the returned root node. Example: reshape "X*31" with "(X<<5)-X". |
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1071 // Node *shift=phase->transform(new(C)LShiftINode(in(1),phase->intcon(5))); |
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1072 // return new (C) AddINode(shift, in(1)); |
0 | 1073 // |
1074 // When making a Node for a constant use 'phase->makecon' or 'phase->intcon'. | |
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1075 // These forms are faster than 'phase->transform(new (C) ConNode())' and Do |
0 | 1076 // The Right Thing with def-use info. |
1077 // | |
1078 // You cannot bury the 'this' Node inside of a graph reshape. If the reshaped | |
1079 // graph uses the 'this' Node it must be the root. If you want a Node with | |
1080 // the same Opcode as the 'this' pointer use 'clone'. | |
1081 // | |
1082 Node *Node::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1083 return NULL; // Default to being Ideal already | |
1084 } | |
1085 | |
1086 // Some nodes have specific Ideal subgraph transformations only if they are | |
1087 // unique users of specific nodes. Such nodes should be put on IGVN worklist | |
1088 // for the transformations to happen. | |
1089 bool Node::has_special_unique_user() const { | |
1090 assert(outcnt() == 1, "match only for unique out"); | |
1091 Node* n = unique_out(); | |
1092 int op = Opcode(); | |
1093 if( this->is_Store() ) { | |
1094 // Condition for back-to-back stores folding. | |
1095 return n->Opcode() == op && n->in(MemNode::Memory) == this; | |
1096 } else if( op == Op_AddL ) { | |
1097 // Condition for convL2I(addL(x,y)) ==> addI(convL2I(x),convL2I(y)) | |
1098 return n->Opcode() == Op_ConvL2I && n->in(1) == this; | |
1099 } else if( op == Op_SubI || op == Op_SubL ) { | |
1100 // Condition for subI(x,subI(y,z)) ==> subI(addI(x,z),y) | |
1101 return n->Opcode() == op && n->in(2) == this; | |
1102 } | |
1103 return false; | |
1104 }; | |
1105 | |
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1106 //--------------------------find_exact_control--------------------------------- |
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1107 // Skip Proj and CatchProj nodes chains. Check for Null and Top. |
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1108 Node* Node::find_exact_control(Node* ctrl) { |
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1109 if (ctrl == NULL && this->is_Region()) |
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1110 ctrl = this->as_Region()->is_copy(); |
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1111 |
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1112 if (ctrl != NULL && ctrl->is_CatchProj()) { |
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1113 if (ctrl->as_CatchProj()->_con == CatchProjNode::fall_through_index) |
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1114 ctrl = ctrl->in(0); |
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1115 if (ctrl != NULL && !ctrl->is_top()) |
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1116 ctrl = ctrl->in(0); |
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1117 } |
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1118 |
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1119 if (ctrl != NULL && ctrl->is_Proj()) |
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1120 ctrl = ctrl->in(0); |
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1121 |
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1122 return ctrl; |
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1123 } |
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1124 |
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1125 //--------------------------dominates------------------------------------------ |
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1126 // Helper function for MemNode::all_controls_dominate(). |
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1127 // Check if 'this' control node dominates or equal to 'sub' control node. |
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1128 // We already know that if any path back to Root or Start reaches 'this', |
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1129 // then all paths so, so this is a simple search for one example, |
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1130 // not an exhaustive search for a counterexample. |
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1131 bool Node::dominates(Node* sub, Node_List &nlist) { |
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1132 assert(this->is_CFG(), "expecting control"); |
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1133 assert(sub != NULL && sub->is_CFG(), "expecting control"); |
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1134 |
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1135 // detect dead cycle without regions |
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1136 int iterations_without_region_limit = DominatorSearchLimit; |
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1137 |
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1138 Node* orig_sub = sub; |
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1139 Node* dom = this; |
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1140 bool met_dom = false; |
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1141 nlist.clear(); |
163 | 1142 |
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1143 // Walk 'sub' backward up the chain to 'dom', watching for regions. |
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1144 // After seeing 'dom', continue up to Root or Start. |
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1145 // If we hit a region (backward split point), it may be a loop head. |
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1146 // Keep going through one of the region's inputs. If we reach the |
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1147 // same region again, go through a different input. Eventually we |
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1148 // will either exit through the loop head, or give up. |
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1149 // (If we get confused, break out and return a conservative 'false'.) |
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1150 while (sub != NULL) { |
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1151 if (sub->is_top()) break; // Conservative answer for dead code. |
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1152 if (sub == dom) { |
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1153 if (nlist.size() == 0) { |
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1154 // No Region nodes except loops were visited before and the EntryControl |
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1155 // path was taken for loops: it did not walk in a cycle. |
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1156 return true; |
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1157 } else if (met_dom) { |
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1158 break; // already met before: walk in a cycle |
163 | 1159 } else { |
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1160 // Region nodes were visited. Continue walk up to Start or Root |
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1161 // to make sure that it did not walk in a cycle. |
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1162 met_dom = true; // first time meet |
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1163 iterations_without_region_limit = DominatorSearchLimit; // Reset |
163 | 1164 } |
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1165 } |
163 | 1166 if (sub->is_Start() || sub->is_Root()) { |
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1167 // Success if we met 'dom' along a path to Start or Root. |
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1168 // We assume there are no alternative paths that avoid 'dom'. |
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1169 // (This assumption is up to the caller to ensure!) |
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1170 return met_dom; |
163 | 1171 } |
193
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1172 Node* up = sub->in(0); |
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1173 // Normalize simple pass-through regions and projections: |
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1174 up = sub->find_exact_control(up); |
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1175 // If sub == up, we found a self-loop. Try to push past it. |
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1176 if (sub == up && sub->is_Loop()) { |
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1177 // Take loop entry path on the way up to 'dom'. |
163 | 1178 up = sub->in(1); // in(LoopNode::EntryControl); |
193
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1179 } else if (sub == up && sub->is_Region() && sub->req() != 3) { |
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1180 // Always take in(1) path on the way up to 'dom' for clone regions |
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1181 // (with only one input) or regions which merge > 2 paths |
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1182 // (usually used to merge fast/slow paths). |
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1183 up = sub->in(1); |
163 | 1184 } else if (sub == up && sub->is_Region()) { |
193
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1185 // Try both paths for Regions with 2 input paths (it may be a loop head). |
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1186 // It could give conservative 'false' answer without information |
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1187 // which region's input is the entry path. |
163 | 1188 iterations_without_region_limit = DominatorSearchLimit; // Reset |
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1189 |
163 | 1190 bool region_was_visited_before = false; |
193
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1191 // Was this Region node visited before? |
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1192 // If so, we have reached it because we accidentally took a |
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1193 // loop-back edge from 'sub' back into the body of the loop, |
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1194 // and worked our way up again to the loop header 'sub'. |
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1195 // So, take the first unexplored path on the way up to 'dom'. |
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1196 for (int j = nlist.size() - 1; j >= 0; j--) { |
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1197 intptr_t ni = (intptr_t)nlist.at(j); |
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1198 Node* visited = (Node*)(ni & ~1); |
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1199 bool visited_twice_already = ((ni & 1) != 0); |
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1200 if (visited == sub) { |
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1201 if (visited_twice_already) { |
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1202 // Visited 2 paths, but still stuck in loop body. Give up. |
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1203 return false; |
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1204 } |
193
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1205 // The Region node was visited before only once. |
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1206 // (We will repush with the low bit set, below.) |
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1207 nlist.remove(j); |
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1208 // We will find a new edge and re-insert. |
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1209 region_was_visited_before = true; |
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1210 break; |
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|
1211 } |
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1212 } |
193
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1213 |
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1214 // Find an incoming edge which has not been seen yet; walk through it. |
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1215 assert(up == sub, ""); |
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1216 uint skip = region_was_visited_before ? 1 : 0; |
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1217 for (uint i = 1; i < sub->req(); i++) { |
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1218 Node* in = sub->in(i); |
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1219 if (in != NULL && !in->is_top() && in != sub) { |
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1220 if (skip == 0) { |
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1221 up = in; |
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1222 break; |
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1223 } |
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1224 --skip; // skip this nontrivial input |
163 | 1225 } |
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1226 } |
193
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1227 |
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1228 // Set 0 bit to indicate that both paths were taken. |
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1229 nlist.push((Node*)((intptr_t)sub + (region_was_visited_before ? 1 : 0))); |
85
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1230 } |
193
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1231 |
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1232 if (up == sub) { |
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1233 break; // some kind of tight cycle |
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1234 } |
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1235 if (up == orig_sub && met_dom) { |
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1236 // returned back after visiting 'dom' |
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1237 break; // some kind of cycle |
163 | 1238 } |
1239 if (--iterations_without_region_limit < 0) { | |
193
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1240 break; // dead cycle |
163 | 1241 } |
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1242 sub = up; |
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1243 } |
193
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1244 |
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1245 // Did not meet Root or Start node in pred. chain. |
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1246 // Conservative answer for dead code. |
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1247 return false; |
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1248 } |
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1249 |
0 | 1250 //------------------------------remove_dead_region----------------------------- |
1251 // This control node is dead. Follow the subgraph below it making everything | |
1252 // using it dead as well. This will happen normally via the usual IterGVN | |
1253 // worklist but this call is more efficient. Do not update use-def info | |
1254 // inside the dead region, just at the borders. | |
305 | 1255 static void kill_dead_code( Node *dead, PhaseIterGVN *igvn ) { |
0 | 1256 // Con's are a popular node to re-hit in the hash table again. |
305 | 1257 if( dead->is_Con() ) return; |
0 | 1258 |
1259 // Can't put ResourceMark here since igvn->_worklist uses the same arena | |
1260 // for verify pass with +VerifyOpto and we add/remove elements in it here. | |
1261 Node_List nstack(Thread::current()->resource_area()); | |
1262 | |
1263 Node *top = igvn->C->top(); | |
1264 nstack.push(dead); | |
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1265 bool has_irreducible_loop = igvn->C->has_irreducible_loop(); |
0 | 1266 |
1267 while (nstack.size() > 0) { | |
1268 dead = nstack.pop(); | |
1269 if (dead->outcnt() > 0) { | |
1270 // Keep dead node on stack until all uses are processed. | |
1271 nstack.push(dead); | |
1272 // For all Users of the Dead... ;-) | |
1273 for (DUIterator_Last kmin, k = dead->last_outs(kmin); k >= kmin; ) { | |
1274 Node* use = dead->last_out(k); | |
1275 igvn->hash_delete(use); // Yank from hash table prior to mod | |
1276 if (use->in(0) == dead) { // Found another dead node | |
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1277 assert (!use->is_Con(), "Control for Con node should be Root node."); |
0 | 1278 use->set_req(0, top); // Cut dead edge to prevent processing |
1279 nstack.push(use); // the dead node again. | |
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1280 } else if (!has_irreducible_loop && // Backedge could be alive in irreducible loop |
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1281 use->is_Loop() && !use->is_Root() && // Don't kill Root (RootNode extends LoopNode) |
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1282 use->in(LoopNode::EntryControl) == dead) { // Dead loop if its entry is dead |
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1283 use->set_req(LoopNode::EntryControl, top); // Cut dead edge to prevent processing |
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1284 use->set_req(0, top); // Cut self edge |
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1285 nstack.push(use); |
0 | 1286 } else { // Else found a not-dead user |
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1287 // Dead if all inputs are top or null |
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1288 bool dead_use = !use->is_Root(); // Keep empty graph alive |
0 | 1289 for (uint j = 1; j < use->req(); j++) { |
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1290 Node* in = use->in(j); |
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1291 if (in == dead) { // Turn all dead inputs into TOP |
0 | 1292 use->set_req(j, top); |
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1293 } else if (in != NULL && !in->is_top()) { |
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1294 dead_use = false; |
0 | 1295 } |
1296 } | |
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1297 if (dead_use) { |
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1298 if (use->is_Region()) { |
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1299 use->set_req(0, top); // Cut self edge |
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1300 } |
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1301 nstack.push(use); |
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1302 } else { |
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1303 igvn->_worklist.push(use); |
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1304 } |
0 | 1305 } |
1306 // Refresh the iterator, since any number of kills might have happened. | |
1307 k = dead->last_outs(kmin); | |
1308 } | |
1309 } else { // (dead->outcnt() == 0) | |
1310 // Done with outputs. | |
1311 igvn->hash_delete(dead); | |
1312 igvn->_worklist.remove(dead); | |
1313 igvn->set_type(dead, Type::TOP); | |
1314 if (dead->is_macro()) { | |
1315 igvn->C->remove_macro_node(dead); | |
1316 } | |
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1317 if (dead->is_expensive()) { |
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1318 igvn->C->remove_expensive_node(dead); |
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1319 } |
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1320 igvn->C->record_dead_node(dead->_idx); |
0 | 1321 // Kill all inputs to the dead guy |
1322 for (uint i=0; i < dead->req(); i++) { | |
1323 Node *n = dead->in(i); // Get input to dead guy | |
1324 if (n != NULL && !n->is_top()) { // Input is valid? | |
1325 dead->set_req(i, top); // Smash input away | |
1326 if (n->outcnt() == 0) { // Input also goes dead? | |
1327 if (!n->is_Con()) | |
1328 nstack.push(n); // Clear it out as well | |
1329 } else if (n->outcnt() == 1 && | |
1330 n->has_special_unique_user()) { | |
1331 igvn->add_users_to_worklist( n ); | |
1332 } else if (n->outcnt() <= 2 && n->is_Store()) { | |
1333 // Push store's uses on worklist to enable folding optimization for | |
1334 // store/store and store/load to the same address. | |
1335 // The restriction (outcnt() <= 2) is the same as in set_req_X() | |
1336 // and remove_globally_dead_node(). | |
1337 igvn->add_users_to_worklist( n ); | |
1338 } | |
1339 } | |
1340 } | |
1341 } // (dead->outcnt() == 0) | |
1342 } // while (nstack.size() > 0) for outputs | |
305 | 1343 return; |
0 | 1344 } |
1345 | |
1346 //------------------------------remove_dead_region----------------------------- | |
1347 bool Node::remove_dead_region(PhaseGVN *phase, bool can_reshape) { | |
1348 Node *n = in(0); | |
1349 if( !n ) return false; | |
1350 // Lost control into this guy? I.e., it became unreachable? | |
1351 // Aggressively kill all unreachable code. | |
1352 if (can_reshape && n->is_top()) { | |
305 | 1353 kill_dead_code(this, phase->is_IterGVN()); |
1354 return false; // Node is dead. | |
0 | 1355 } |
1356 | |
1357 if( n->is_Region() && n->as_Region()->is_copy() ) { | |
1358 Node *m = n->nonnull_req(); | |
1359 set_req(0, m); | |
1360 return true; | |
1361 } | |
1362 return false; | |
1363 } | |
1364 | |
1365 //------------------------------Ideal_DU_postCCP------------------------------- | |
1366 // Idealize graph, using DU info. Must clone result into new-space | |
1367 Node *Node::Ideal_DU_postCCP( PhaseCCP * ) { | |
1368 return NULL; // Default to no change | |
1369 } | |
1370 | |
1371 //------------------------------hash------------------------------------------- | |
1372 // Hash function over Nodes. | |
1373 uint Node::hash() const { | |
1374 uint sum = 0; | |
1375 for( uint i=0; i<_cnt; i++ ) // Add in all inputs | |
1376 sum = (sum<<1)-(uintptr_t)in(i); // Ignore embedded NULLs | |
1377 return (sum>>2) + _cnt + Opcode(); | |
1378 } | |
1379 | |
1380 //------------------------------cmp-------------------------------------------- | |
1381 // Compare special parts of simple Nodes | |
1382 uint Node::cmp( const Node &n ) const { | |
1383 return 1; // Must be same | |
1384 } | |
1385 | |
1386 //------------------------------rematerialize----------------------------------- | |
1387 // Should we clone rather than spill this instruction? | |
1388 bool Node::rematerialize() const { | |
1389 if ( is_Mach() ) | |
1390 return this->as_Mach()->rematerialize(); | |
1391 else | |
1392 return (_flags & Flag_rematerialize) != 0; | |
1393 } | |
1394 | |
1395 //------------------------------needs_anti_dependence_check--------------------- | |
1396 // Nodes which use memory without consuming it, hence need antidependences. | |
1397 bool Node::needs_anti_dependence_check() const { | |
1398 if( req() < 2 || (_flags & Flag_needs_anti_dependence_check) == 0 ) | |
1399 return false; | |
1400 else | |
1401 return in(1)->bottom_type()->has_memory(); | |
1402 } | |
1403 | |
1404 | |
1405 // Get an integer constant from a ConNode (or CastIINode). | |
1406 // Return a default value if there is no apparent constant here. | |
1407 const TypeInt* Node::find_int_type() const { | |
1408 if (this->is_Type()) { | |
1409 return this->as_Type()->type()->isa_int(); | |
1410 } else if (this->is_Con()) { | |
1411 assert(is_Mach(), "should be ConNode(TypeNode) or else a MachNode"); | |
1412 return this->bottom_type()->isa_int(); | |
1413 } | |
1414 return NULL; | |
1415 } | |
1416 | |
1417 // Get a pointer constant from a ConstNode. | |
1418 // Returns the constant if it is a pointer ConstNode | |
1419 intptr_t Node::get_ptr() const { | |
1420 assert( Opcode() == Op_ConP, "" ); | |
1421 return ((ConPNode*)this)->type()->is_ptr()->get_con(); | |
1422 } | |
1423 | |
113
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1424 // Get a narrow oop constant from a ConNNode. |
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1425 intptr_t Node::get_narrowcon() const { |
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1426 assert( Opcode() == Op_ConN, "" ); |
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1427 return ((ConNNode*)this)->type()->is_narrowoop()->get_con(); |
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1428 } |
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1429 |
0 | 1430 // Get a long constant from a ConNode. |
1431 // Return a default value if there is no apparent constant here. | |
1432 const TypeLong* Node::find_long_type() const { | |
1433 if (this->is_Type()) { | |
1434 return this->as_Type()->type()->isa_long(); | |
1435 } else if (this->is_Con()) { | |
1436 assert(is_Mach(), "should be ConNode(TypeNode) or else a MachNode"); | |
1437 return this->bottom_type()->isa_long(); | |
1438 } | |
1439 return NULL; | |
1440 } | |
1441 | |
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1442 |
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1443 /** |
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1444 * Return a ptr type for nodes which should have it. |
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1445 */ |
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1446 const TypePtr* Node::get_ptr_type() const { |
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1447 const TypePtr* tp = this->bottom_type()->make_ptr(); |
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1448 #ifdef ASSERT |
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1449 if (tp == NULL) { |
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1450 this->dump(1); |
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1451 assert((tp != NULL), "unexpected node type"); |
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1452 } |
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1453 #endif |
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1454 return tp; |
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1455 } |
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1456 |
0 | 1457 // Get a double constant from a ConstNode. |
1458 // Returns the constant if it is a double ConstNode | |
1459 jdouble Node::getd() const { | |
1460 assert( Opcode() == Op_ConD, "" ); | |
1461 return ((ConDNode*)this)->type()->is_double_constant()->getd(); | |
1462 } | |
1463 | |
1464 // Get a float constant from a ConstNode. | |
1465 // Returns the constant if it is a float ConstNode | |
1466 jfloat Node::getf() const { | |
1467 assert( Opcode() == Op_ConF, "" ); | |
1468 return ((ConFNode*)this)->type()->is_float_constant()->getf(); | |
1469 } | |
1470 | |
1471 #ifndef PRODUCT | |
1472 | |
1473 //----------------------------NotANode---------------------------------------- | |
1474 // Used in debugging code to avoid walking across dead or uninitialized edges. | |
1475 static inline bool NotANode(const Node* n) { | |
1476 if (n == NULL) return true; | |
1477 if (((intptr_t)n & 1) != 0) return true; // uninitialized, etc. | |
1478 if (*(address*)n == badAddress) return true; // kill by Node::destruct | |
1479 return false; | |
1480 } | |
1481 | |
1482 | |
1483 //------------------------------find------------------------------------------ | |
1484 // Find a neighbor of this Node with the given _idx | |
1485 // If idx is negative, find its absolute value, following both _in and _out. | |
2403 | 1486 static void find_recur(Compile* C, Node* &result, Node *n, int idx, bool only_ctrl, |
1487 VectorSet* old_space, VectorSet* new_space ) { | |
0 | 1488 int node_idx = (idx >= 0) ? idx : -idx; |
1489 if (NotANode(n)) return; // Gracefully handle NULL, -1, 0xabababab, etc. | |
2403 | 1490 // Contained in new_space or old_space? Check old_arena first since it's mostly empty. |
1491 VectorSet *v = C->old_arena()->contains(n) ? old_space : new_space; | |
0 | 1492 if( v->test(n->_idx) ) return; |
1493 if( (int)n->_idx == node_idx | |
1494 debug_only(|| n->debug_idx() == node_idx) ) { | |
1495 if (result != NULL) | |
1496 tty->print("find: " INTPTR_FORMAT " and " INTPTR_FORMAT " both have idx==%d\n", | |
1497 (uintptr_t)result, (uintptr_t)n, node_idx); | |
1498 result = n; | |
1499 } | |
1500 v->set(n->_idx); | |
1501 for( uint i=0; i<n->len(); i++ ) { | |
1502 if( only_ctrl && !(n->is_Region()) && (n->Opcode() != Op_Root) && (i != TypeFunc::Control) ) continue; | |
2403 | 1503 find_recur(C, result, n->in(i), idx, only_ctrl, old_space, new_space ); |
0 | 1504 } |
1505 // Search along forward edges also: | |
1506 if (idx < 0 && !only_ctrl) { | |
1507 for( uint j=0; j<n->outcnt(); j++ ) { | |
2403 | 1508 find_recur(C, result, n->raw_out(j), idx, only_ctrl, old_space, new_space ); |
0 | 1509 } |
1510 } | |
1511 #ifdef ASSERT | |
2403 | 1512 // Search along debug_orig edges last, checking for cycles |
1513 Node* orig = n->debug_orig(); | |
1514 if (orig != NULL) { | |
1515 do { | |
1516 if (NotANode(orig)) break; | |
1517 find_recur(C, result, orig, idx, only_ctrl, old_space, new_space ); | |
1518 orig = orig->debug_orig(); | |
1519 } while (orig != NULL && orig != n->debug_orig()); | |
0 | 1520 } |
1521 #endif //ASSERT | |
1522 } | |
1523 | |
1524 // call this from debugger: | |
1525 Node* find_node(Node* n, int idx) { | |
1526 return n->find(idx); | |
1527 } | |
1528 | |
1529 //------------------------------find------------------------------------------- | |
1530 Node* Node::find(int idx) const { | |
1531 ResourceArea *area = Thread::current()->resource_area(); | |
1532 VectorSet old_space(area), new_space(area); | |
1533 Node* result = NULL; | |
2403 | 1534 find_recur(Compile::current(), result, (Node*) this, idx, false, &old_space, &new_space ); |
0 | 1535 return result; |
1536 } | |
1537 | |
1538 //------------------------------find_ctrl-------------------------------------- | |
1539 // Find an ancestor to this node in the control history with given _idx | |
1540 Node* Node::find_ctrl(int idx) const { | |
1541 ResourceArea *area = Thread::current()->resource_area(); | |
1542 VectorSet old_space(area), new_space(area); | |
1543 Node* result = NULL; | |
2403 | 1544 find_recur(Compile::current(), result, (Node*) this, idx, true, &old_space, &new_space ); |
0 | 1545 return result; |
1546 } | |
1547 #endif | |
1548 | |
1549 | |
1550 | |
1551 #ifndef PRODUCT | |
1552 | |
1553 // -----------------------------Name------------------------------------------- | |
1554 extern const char *NodeClassNames[]; | |
1555 const char *Node::Name() const { return NodeClassNames[Opcode()]; } | |
1556 | |
1557 static bool is_disconnected(const Node* n) { | |
1558 for (uint i = 0; i < n->req(); i++) { | |
1559 if (n->in(i) != NULL) return false; | |
1560 } | |
1561 return true; | |
1562 } | |
1563 | |
1564 #ifdef ASSERT | |
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1565 static void dump_orig(Node* orig, outputStream *st) { |
0 | 1566 Compile* C = Compile::current(); |
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1567 if (NotANode(orig)) orig = NULL; |
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1568 if (orig != NULL && !C->node_arena()->contains(orig)) orig = NULL; |
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1569 if (orig == NULL) return; |
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1570 st->print(" !orig="); |
0 | 1571 Node* fast = orig->debug_orig(); // tortoise & hare algorithm to detect loops |
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1572 if (NotANode(fast)) fast = NULL; |
0 | 1573 while (orig != NULL) { |
1574 bool discon = is_disconnected(orig); // if discon, print [123] else 123 | |
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1575 if (discon) st->print("["); |
0 | 1576 if (!Compile::current()->node_arena()->contains(orig)) |
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1577 st->print("o"); |
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1578 st->print("%d", orig->_idx); |
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1579 if (discon) st->print("]"); |
0 | 1580 orig = orig->debug_orig(); |
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1581 if (NotANode(orig)) orig = NULL; |
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1582 if (orig != NULL && !C->node_arena()->contains(orig)) orig = NULL; |
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1583 if (orig != NULL) st->print(","); |
0 | 1584 if (fast != NULL) { |
1585 // Step fast twice for each single step of orig: | |
1586 fast = fast->debug_orig(); | |
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1587 if (NotANode(fast)) fast = NULL; |
0 | 1588 if (fast != NULL && fast != orig) { |
1589 fast = fast->debug_orig(); | |
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1590 if (NotANode(fast)) fast = NULL; |
0 | 1591 } |
1592 if (fast == orig) { | |
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1593 st->print("..."); |
0 | 1594 break; |
1595 } | |
1596 } | |
1597 } | |
1598 } | |
1599 | |
1600 void Node::set_debug_orig(Node* orig) { | |
1601 _debug_orig = orig; | |
1602 if (BreakAtNode == 0) return; | |
1603 if (NotANode(orig)) orig = NULL; | |
1604 int trip = 10; | |
1605 while (orig != NULL) { | |
1606 if (orig->debug_idx() == BreakAtNode || (int)orig->_idx == BreakAtNode) { | |
1607 tty->print_cr("BreakAtNode: _idx=%d _debug_idx=%d orig._idx=%d orig._debug_idx=%d", | |
1608 this->_idx, this->debug_idx(), orig->_idx, orig->debug_idx()); | |
1609 BREAKPOINT; | |
1610 } | |
1611 orig = orig->debug_orig(); | |
1612 if (NotANode(orig)) orig = NULL; | |
1613 if (trip-- <= 0) break; | |
1614 } | |
1615 } | |
1616 #endif //ASSERT | |
1617 | |
1618 //------------------------------dump------------------------------------------ | |
1619 // Dump a Node | |
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1620 void Node::dump(const char* suffix, outputStream *st) const { |
0 | 1621 Compile* C = Compile::current(); |
1622 bool is_new = C->node_arena()->contains(this); | |
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1623 C->_in_dump_cnt++; |
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1624 st->print("%c%d\t%s\t=== ", is_new ? ' ' : 'o', _idx, Name()); |
0 | 1625 |
1626 // Dump the required and precedence inputs | |
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1627 dump_req(st); |
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1628 dump_prec(st); |
0 | 1629 // Dump the outputs |
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1630 dump_out(st); |
0 | 1631 |
1632 if (is_disconnected(this)) { | |
1633 #ifdef ASSERT | |
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1634 st->print(" [%d]",debug_idx()); |
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1635 dump_orig(debug_orig(), st); |
0 | 1636 #endif |
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1637 st->cr(); |
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1638 C->_in_dump_cnt--; |
0 | 1639 return; // don't process dead nodes |
1640 } | |
1641 | |
1642 // Dump node-specific info | |
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1643 dump_spec(st); |
0 | 1644 #ifdef ASSERT |
1645 // Dump the non-reset _debug_idx | |
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1646 if (Verbose && WizardMode) { |
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1647 st->print(" [%d]",debug_idx()); |
0 | 1648 } |
1649 #endif | |
1650 | |
1651 const Type *t = bottom_type(); | |
1652 | |
1653 if (t != NULL && (t->isa_instptr() || t->isa_klassptr())) { | |
1654 const TypeInstPtr *toop = t->isa_instptr(); | |
1655 const TypeKlassPtr *tkls = t->isa_klassptr(); | |
1656 ciKlass* klass = toop ? toop->klass() : (tkls ? tkls->klass() : NULL ); | |
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1657 if (klass && klass->is_loaded() && klass->is_interface()) { |
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1658 st->print(" Interface:"); |
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1659 } else if (toop) { |
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1660 st->print(" Oop:"); |
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1661 } else if (tkls) { |
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1662 st->print(" Klass:"); |
0 | 1663 } |
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1664 t->dump_on(st); |
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1665 } else if (t == Type::MEMORY) { |
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1666 st->print(" Memory:"); |
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1667 MemNode::dump_adr_type(this, adr_type(), st); |
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1668 } else if (Verbose || WizardMode) { |
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1669 st->print(" Type:"); |
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1670 if (t) { |
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1671 t->dump_on(st); |
0 | 1672 } else { |
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1673 st->print("no type"); |
0 | 1674 } |
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1675 } else if (t->isa_vect() && this->is_MachSpillCopy()) { |
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1676 // Dump MachSpillcopy vector type. |
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1677 t->dump_on(st); |
0 | 1678 } |
1679 if (is_new) { | |
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1680 debug_only(dump_orig(debug_orig(), st)); |
0 | 1681 Node_Notes* nn = C->node_notes_at(_idx); |
1682 if (nn != NULL && !nn->is_clear()) { | |
1683 if (nn->jvms() != NULL) { | |
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1684 st->print(" !jvms:"); |
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1685 nn->jvms()->dump_spec(st); |
0 | 1686 } |
1687 } | |
1688 } | |
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1689 if (suffix) st->print("%s", suffix); |
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1690 C->_in_dump_cnt--; |
0 | 1691 } |
1692 | |
1693 //------------------------------dump_req-------------------------------------- | |
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1694 void Node::dump_req(outputStream *st) const { |
0 | 1695 // Dump the required input edges |
1696 for (uint i = 0; i < req(); i++) { // For all required inputs | |
1697 Node* d = in(i); | |
1698 if (d == NULL) { | |
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1699 st->print("_ "); |
0 | 1700 } else if (NotANode(d)) { |
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1701 st->print("NotANode "); // uninitialized, sentinel, garbage, etc. |
0 | 1702 } else { |
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1703 st->print("%c%d ", Compile::current()->node_arena()->contains(d) ? ' ' : 'o', d->_idx); |
0 | 1704 } |
1705 } | |
1706 } | |
1707 | |
1708 | |
1709 //------------------------------dump_prec------------------------------------- | |
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1710 void Node::dump_prec(outputStream *st) const { |
0 | 1711 // Dump the precedence edges |
1712 int any_prec = 0; | |
1713 for (uint i = req(); i < len(); i++) { // For all precedence inputs | |
1714 Node* p = in(i); | |
1715 if (p != NULL) { | |
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1716 if (!any_prec++) st->print(" |"); |
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1717 if (NotANode(p)) { st->print("NotANode "); continue; } |
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1718 st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx); |
0 | 1719 } |
1720 } | |
1721 } | |
1722 | |
1723 //------------------------------dump_out-------------------------------------- | |
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1724 void Node::dump_out(outputStream *st) const { |
0 | 1725 // Delimit the output edges |
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1726 st->print(" [["); |
0 | 1727 // Dump the output edges |
1728 for (uint i = 0; i < _outcnt; i++) { // For all outputs | |
1729 Node* u = _out[i]; | |
1730 if (u == NULL) { | |
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1731 st->print("_ "); |
0 | 1732 } else if (NotANode(u)) { |
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1733 st->print("NotANode "); |
0 | 1734 } else { |
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1735 st->print("%c%d ", Compile::current()->node_arena()->contains(u) ? ' ' : 'o', u->_idx); |
0 | 1736 } |
1737 } | |
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1738 st->print("]] "); |
0 | 1739 } |
1740 | |
1741 //------------------------------dump_nodes------------------------------------- | |
1742 static void dump_nodes(const Node* start, int d, bool only_ctrl) { | |
1743 Node* s = (Node*)start; // remove const | |
1744 if (NotANode(s)) return; | |
1745 | |
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1746 uint depth = (uint)ABS(d); |
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1747 int direction = d; |
0 | 1748 Compile* C = Compile::current(); |
40 | 1749 GrowableArray <Node *> nstack(C->unique()); |
0 | 1750 |
40 | 1751 nstack.append(s); |
1752 int begin = 0; | |
1753 int end = 0; | |
1754 for(uint i = 0; i < depth; i++) { | |
1755 end = nstack.length(); | |
1756 for(int j = begin; j < end; j++) { | |
1757 Node* tp = nstack.at(j); | |
1758 uint limit = direction > 0 ? tp->len() : tp->outcnt(); | |
1759 for(uint k = 0; k < limit; k++) { | |
1760 Node* n = direction > 0 ? tp->in(k) : tp->raw_out(k); | |
0 | 1761 |
40 | 1762 if (NotANode(n)) continue; |
1763 // do not recurse through top or the root (would reach unrelated stuff) | |
1764 if (n->is_Root() || n->is_top()) continue; | |
1765 if (only_ctrl && !n->is_CFG()) continue; | |
0 | 1766 |
40 | 1767 bool on_stack = nstack.contains(n); |
1768 if (!on_stack) { | |
1769 nstack.append(n); | |
0 | 1770 } |
1771 } | |
1772 } | |
40 | 1773 begin = end; |
1774 } | |
1775 end = nstack.length(); | |
1776 if (direction > 0) { | |
1777 for(int j = end-1; j >= 0; j--) { | |
1778 nstack.at(j)->dump(); | |
1779 } | |
1780 } else { | |
1781 for(int j = 0; j < end; j++) { | |
1782 nstack.at(j)->dump(); | |
1783 } | |
0 | 1784 } |
1785 } | |
1786 | |
1787 //------------------------------dump------------------------------------------- | |
1788 void Node::dump(int d) const { | |
1789 dump_nodes(this, d, false); | |
1790 } | |
1791 | |
1792 //------------------------------dump_ctrl-------------------------------------- | |
1793 // Dump a Node's control history to depth | |
1794 void Node::dump_ctrl(int d) const { | |
1795 dump_nodes(this, d, true); | |
1796 } | |
1797 | |
1798 // VERIFICATION CODE | |
1799 // For each input edge to a node (ie - for each Use-Def edge), verify that | |
1800 // there is a corresponding Def-Use edge. | |
1801 //------------------------------verify_edges----------------------------------- | |
1802 void Node::verify_edges(Unique_Node_List &visited) { | |
1803 uint i, j, idx; | |
1804 int cnt; | |
1805 Node *n; | |
1806 | |
1807 // Recursive termination test | |
1808 if (visited.member(this)) return; | |
1809 visited.push(this); | |
1810 | |
605 | 1811 // Walk over all input edges, checking for correspondence |
0 | 1812 for( i = 0; i < len(); i++ ) { |
1813 n = in(i); | |
1814 if (n != NULL && !n->is_top()) { | |
1815 // Count instances of (Node *)this | |
1816 cnt = 0; | |
1817 for (idx = 0; idx < n->_outcnt; idx++ ) { | |
1818 if (n->_out[idx] == (Node *)this) cnt++; | |
1819 } | |
1820 assert( cnt > 0,"Failed to find Def-Use edge." ); | |
1821 // Check for duplicate edges | |
1822 // walk the input array downcounting the input edges to n | |
1823 for( j = 0; j < len(); j++ ) { | |
1824 if( in(j) == n ) cnt--; | |
1825 } | |
1826 assert( cnt == 0,"Mismatched edge count."); | |
1827 } else if (n == NULL) { | |
1828 assert(i >= req() || i == 0 || is_Region() || is_Phi(), "only regions or phis have null data edges"); | |
1829 } else { | |
1830 assert(n->is_top(), "sanity"); | |
1831 // Nothing to check. | |
1832 } | |
1833 } | |
1834 // Recursive walk over all input edges | |
1835 for( i = 0; i < len(); i++ ) { | |
1836 n = in(i); | |
1837 if( n != NULL ) | |
1838 in(i)->verify_edges(visited); | |
1839 } | |
1840 } | |
1841 | |
1842 //------------------------------verify_recur----------------------------------- | |
1843 static const Node *unique_top = NULL; | |
1844 | |
1845 void Node::verify_recur(const Node *n, int verify_depth, | |
1846 VectorSet &old_space, VectorSet &new_space) { | |
1847 if ( verify_depth == 0 ) return; | |
1848 if (verify_depth > 0) --verify_depth; | |
1849 | |
1850 Compile* C = Compile::current(); | |
1851 | |
1852 // Contained in new_space or old_space? | |
1853 VectorSet *v = C->node_arena()->contains(n) ? &new_space : &old_space; | |
1854 // Check for visited in the proper space. Numberings are not unique | |
605 | 1855 // across spaces so we need a separate VectorSet for each space. |
0 | 1856 if( v->test_set(n->_idx) ) return; |
1857 | |
1858 if (n->is_Con() && n->bottom_type() == Type::TOP) { | |
1859 if (C->cached_top_node() == NULL) | |
1860 C->set_cached_top_node((Node*)n); | |
1861 assert(C->cached_top_node() == n, "TOP node must be unique"); | |
1862 } | |
1863 | |
1864 for( uint i = 0; i < n->len(); i++ ) { | |
1865 Node *x = n->in(i); | |
1866 if (!x || x->is_top()) continue; | |
1867 | |
1868 // Verify my input has a def-use edge to me | |
1869 if (true /*VerifyDefUse*/) { | |
1870 // Count use-def edges from n to x | |
1871 int cnt = 0; | |
1872 for( uint j = 0; j < n->len(); j++ ) | |
1873 if( n->in(j) == x ) | |
1874 cnt++; | |
1875 // Count def-use edges from x to n | |
1876 uint max = x->_outcnt; | |
1877 for( uint k = 0; k < max; k++ ) | |
1878 if (x->_out[k] == n) | |
1879 cnt--; | |
1880 assert( cnt == 0, "mismatched def-use edge counts" ); | |
1881 } | |
1882 | |
1883 verify_recur(x, verify_depth, old_space, new_space); | |
1884 } | |
1885 | |
1886 } | |
1887 | |
1888 //------------------------------verify----------------------------------------- | |
1889 // Check Def-Use info for my subgraph | |
1890 void Node::verify() const { | |
1891 Compile* C = Compile::current(); | |
1892 Node* old_top = C->cached_top_node(); | |
1893 ResourceMark rm; | |
1894 ResourceArea *area = Thread::current()->resource_area(); | |
1895 VectorSet old_space(area), new_space(area); | |
1896 verify_recur(this, -1, old_space, new_space); | |
1897 C->set_cached_top_node(old_top); | |
1898 } | |
1899 #endif | |
1900 | |
1901 | |
1902 //------------------------------walk------------------------------------------- | |
1903 // Graph walk, with both pre-order and post-order functions | |
1904 void Node::walk(NFunc pre, NFunc post, void *env) { | |
1905 VectorSet visited(Thread::current()->resource_area()); // Setup for local walk | |
1906 walk_(pre, post, env, visited); | |
1907 } | |
1908 | |
1909 void Node::walk_(NFunc pre, NFunc post, void *env, VectorSet &visited) { | |
1910 if( visited.test_set(_idx) ) return; | |
1911 pre(*this,env); // Call the pre-order walk function | |
1912 for( uint i=0; i<_max; i++ ) | |
1913 if( in(i) ) // Input exists and is not walked? | |
1914 in(i)->walk_(pre,post,env,visited); // Walk it with pre & post functions | |
1915 post(*this,env); // Call the post-order walk function | |
1916 } | |
1917 | |
1918 void Node::nop(Node &, void*) {} | |
1919 | |
1920 //------------------------------Registers-------------------------------------- | |
1921 // Do we Match on this edge index or not? Generally false for Control | |
1922 // and true for everything else. Weird for calls & returns. | |
1923 uint Node::match_edge(uint idx) const { | |
1924 return idx; // True for other than index 0 (control) | |
1925 } | |
1926 | |
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1927 static RegMask _not_used_at_all; |
0 | 1928 // Register classes are defined for specific machines |
1929 const RegMask &Node::out_RegMask() const { | |
1930 ShouldNotCallThis(); | |
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1931 return _not_used_at_all; |
0 | 1932 } |
1933 | |
1934 const RegMask &Node::in_RegMask(uint) const { | |
1935 ShouldNotCallThis(); | |
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1936 return _not_used_at_all; |
0 | 1937 } |
1938 | |
1939 //============================================================================= | |
1940 //----------------------------------------------------------------------------- | |
1941 void Node_Array::reset( Arena *new_arena ) { | |
1942 _a->Afree(_nodes,_max*sizeof(Node*)); | |
1943 _max = 0; | |
1944 _nodes = NULL; | |
1945 _a = new_arena; | |
1946 } | |
1947 | |
1948 //------------------------------clear------------------------------------------ | |
1949 // Clear all entries in _nodes to NULL but keep storage | |
1950 void Node_Array::clear() { | |
1951 Copy::zero_to_bytes( _nodes, _max*sizeof(Node*) ); | |
1952 } | |
1953 | |
1954 //----------------------------------------------------------------------------- | |
1955 void Node_Array::grow( uint i ) { | |
1956 if( !_max ) { | |
1957 _max = 1; | |
1958 _nodes = (Node**)_a->Amalloc( _max * sizeof(Node*) ); | |
1959 _nodes[0] = NULL; | |
1960 } | |
1961 uint old = _max; | |
1962 while( i >= _max ) _max <<= 1; // Double to fit | |
1963 _nodes = (Node**)_a->Arealloc( _nodes, old*sizeof(Node*),_max*sizeof(Node*)); | |
1964 Copy::zero_to_bytes( &_nodes[old], (_max-old)*sizeof(Node*) ); | |
1965 } | |
1966 | |
1967 //----------------------------------------------------------------------------- | |
1968 void Node_Array::insert( uint i, Node *n ) { | |
1969 if( _nodes[_max-1] ) grow(_max); // Get more space if full | |
1970 Copy::conjoint_words_to_higher((HeapWord*)&_nodes[i], (HeapWord*)&_nodes[i+1], ((_max-i-1)*sizeof(Node*))); | |
1971 _nodes[i] = n; | |
1972 } | |
1973 | |
1974 //----------------------------------------------------------------------------- | |
1975 void Node_Array::remove( uint i ) { | |
1976 Copy::conjoint_words_to_lower((HeapWord*)&_nodes[i+1], (HeapWord*)&_nodes[i], ((_max-i-1)*sizeof(Node*))); | |
1977 _nodes[_max-1] = NULL; | |
1978 } | |
1979 | |
1980 //----------------------------------------------------------------------------- | |
1981 void Node_Array::sort( C_sort_func_t func) { | |
1982 qsort( _nodes, _max, sizeof( Node* ), func ); | |
1983 } | |
1984 | |
1985 //----------------------------------------------------------------------------- | |
1986 void Node_Array::dump() const { | |
1987 #ifndef PRODUCT | |
1988 for( uint i = 0; i < _max; i++ ) { | |
1989 Node *nn = _nodes[i]; | |
1990 if( nn != NULL ) { | |
1991 tty->print("%5d--> ",i); nn->dump(); | |
1992 } | |
1993 } | |
1994 #endif | |
1995 } | |
1996 | |
1997 //--------------------------is_iteratively_computed------------------------------ | |
1998 // Operation appears to be iteratively computed (such as an induction variable) | |
1999 // It is possible for this operation to return false for a loop-varying | |
2000 // value, if it appears (by local graph inspection) to be computed by a simple conditional. | |
2001 bool Node::is_iteratively_computed() { | |
2002 if (ideal_reg()) { // does operation have a result register? | |
2003 for (uint i = 1; i < req(); i++) { | |
2004 Node* n = in(i); | |
2005 if (n != NULL && n->is_Phi()) { | |
2006 for (uint j = 1; j < n->req(); j++) { | |
2007 if (n->in(j) == this) { | |
2008 return true; | |
2009 } | |
2010 } | |
2011 } | |
2012 } | |
2013 } | |
2014 return false; | |
2015 } | |
2016 | |
2017 //--------------------------find_similar------------------------------ | |
2018 // Return a node with opcode "opc" and same inputs as "this" if one can | |
2019 // be found; Otherwise return NULL; | |
2020 Node* Node::find_similar(int opc) { | |
2021 if (req() >= 2) { | |
2022 Node* def = in(1); | |
2023 if (def && def->outcnt() >= 2) { | |
2024 for (DUIterator_Fast dmax, i = def->fast_outs(dmax); i < dmax; i++) { | |
2025 Node* use = def->fast_out(i); | |
2026 if (use->Opcode() == opc && | |
2027 use->req() == req()) { | |
2028 uint j; | |
2029 for (j = 0; j < use->req(); j++) { | |
2030 if (use->in(j) != in(j)) { | |
2031 break; | |
2032 } | |
2033 } | |
2034 if (j == use->req()) { | |
2035 return use; | |
2036 } | |
2037 } | |
2038 } | |
2039 } | |
2040 } | |
2041 return NULL; | |
2042 } | |
2043 | |
2044 | |
2045 //--------------------------unique_ctrl_out------------------------------ | |
2046 // Return the unique control out if only one. Null if none or more than one. | |
2047 Node* Node::unique_ctrl_out() { | |
2048 Node* found = NULL; | |
2049 for (uint i = 0; i < outcnt(); i++) { | |
2050 Node* use = raw_out(i); | |
2051 if (use->is_CFG() && use != this) { | |
2052 if (found != NULL) return NULL; | |
2053 found = use; | |
2054 } | |
2055 } | |
2056 return found; | |
2057 } | |
2058 | |
2059 //============================================================================= | |
2060 //------------------------------yank------------------------------------------- | |
2061 // Find and remove | |
2062 void Node_List::yank( Node *n ) { | |
2063 uint i; | |
2064 for( i = 0; i < _cnt; i++ ) | |
2065 if( _nodes[i] == n ) | |
2066 break; | |
2067 | |
2068 if( i < _cnt ) | |
2069 _nodes[i] = _nodes[--_cnt]; | |
2070 } | |
2071 | |
2072 //------------------------------dump------------------------------------------- | |
2073 void Node_List::dump() const { | |
2074 #ifndef PRODUCT | |
2075 for( uint i = 0; i < _cnt; i++ ) | |
2076 if( _nodes[i] ) { | |
2077 tty->print("%5d--> ",i); | |
2078 _nodes[i]->dump(); | |
2079 } | |
2080 #endif | |
2081 } | |
2082 | |
2083 //============================================================================= | |
2084 //------------------------------remove----------------------------------------- | |
2085 void Unique_Node_List::remove( Node *n ) { | |
2086 if( _in_worklist[n->_idx] ) { | |
2087 for( uint i = 0; i < size(); i++ ) | |
2088 if( _nodes[i] == n ) { | |
2089 map(i,Node_List::pop()); | |
2090 _in_worklist >>= n->_idx; | |
2091 return; | |
2092 } | |
2093 ShouldNotReachHere(); | |
2094 } | |
2095 } | |
2096 | |
2097 //-----------------------remove_useless_nodes---------------------------------- | |
2098 // Remove useless nodes from worklist | |
2099 void Unique_Node_List::remove_useless_nodes(VectorSet &useful) { | |
2100 | |
2101 for( uint i = 0; i < size(); ++i ) { | |
2102 Node *n = at(i); | |
2103 assert( n != NULL, "Did not expect null entries in worklist"); | |
2104 if( ! useful.test(n->_idx) ) { | |
2105 _in_worklist >>= n->_idx; | |
2106 map(i,Node_List::pop()); | |
2107 // Node *replacement = Node_List::pop(); | |
2108 // if( i != size() ) { // Check if removing last entry | |
2109 // _nodes[i] = replacement; | |
2110 // } | |
2111 --i; // Visit popped node | |
2112 // If it was last entry, loop terminates since size() was also reduced | |
2113 } | |
2114 } | |
2115 } | |
2116 | |
2117 //============================================================================= | |
2118 void Node_Stack::grow() { | |
2119 size_t old_top = pointer_delta(_inode_top,_inodes,sizeof(INode)); // save _top | |
2120 size_t old_max = pointer_delta(_inode_max,_inodes,sizeof(INode)); | |
2121 size_t max = old_max << 1; // max * 2 | |
2122 _inodes = REALLOC_ARENA_ARRAY(_a, INode, _inodes, old_max, max); | |
2123 _inode_max = _inodes + max; | |
2124 _inode_top = _inodes + old_top; // restore _top | |
2125 } | |
2126 | |
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2127 // Node_Stack is used to map nodes. |
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2128 Node* Node_Stack::find(uint idx) const { |
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2129 uint sz = size(); |
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2130 for (uint i=0; i < sz; i++) { |
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2131 if (idx == index_at(i) ) |
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2132 return node_at(i); |
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2133 } |
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2134 return NULL; |
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2135 } |
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2136 |
0 | 2137 //============================================================================= |
2138 uint TypeNode::size_of() const { return sizeof(*this); } | |
2139 #ifndef PRODUCT | |
2140 void TypeNode::dump_spec(outputStream *st) const { | |
2141 if( !Verbose && !WizardMode ) { | |
2142 // standard dump does this in Verbose and WizardMode | |
2143 st->print(" #"); _type->dump_on(st); | |
2144 } | |
2145 } | |
2146 #endif | |
2147 uint TypeNode::hash() const { | |
2148 return Node::hash() + _type->hash(); | |
2149 } | |
2150 uint TypeNode::cmp( const Node &n ) const | |
2151 { return !Type::cmp( _type, ((TypeNode&)n)._type ); } | |
2152 const Type *TypeNode::bottom_type() const { return _type; } | |
2153 const Type *TypeNode::Value( PhaseTransform * ) const { return _type; } | |
2154 | |
2155 //------------------------------ideal_reg-------------------------------------- | |
2156 uint TypeNode::ideal_reg() const { | |
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2157 return _type->ideal_reg(); |
0 | 2158 } |