Mercurial > hg > truffle
annotate src/share/vm/opto/node.cpp @ 9202:b6629b739a55
Merge.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 22 Apr 2013 09:54:57 +0200 |
parents | 6931f425c517 |
children | 6f3fd5150b67 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "libadt/vectset.hpp" | |
27 #include "memory/allocation.inline.hpp" | |
28 #include "opto/cfgnode.hpp" | |
29 #include "opto/connode.hpp" | |
30 #include "opto/machnode.hpp" | |
31 #include "opto/matcher.hpp" | |
32 #include "opto/node.hpp" | |
33 #include "opto/opcodes.hpp" | |
34 #include "opto/regmask.hpp" | |
35 #include "opto/type.hpp" | |
36 #include "utilities/copy.hpp" | |
0 | 37 |
38 class RegMask; | |
39 // #include "phase.hpp" | |
40 class PhaseTransform; | |
41 class PhaseGVN; | |
42 | |
43 // Arena we are currently building Nodes in | |
44 const uint Node::NotAMachineReg = 0xffff0000; | |
45 | |
46 #ifndef PRODUCT | |
47 extern int nodes_created; | |
48 #endif | |
49 | |
50 #ifdef ASSERT | |
51 | |
52 //-------------------------- construct_node------------------------------------ | |
53 // Set a breakpoint here to identify where a particular node index is built. | |
54 void Node::verify_construction() { | |
55 _debug_orig = NULL; | |
56 int old_debug_idx = Compile::debug_idx(); | |
57 int new_debug_idx = old_debug_idx+1; | |
58 if (new_debug_idx > 0) { | |
59 // Arrange that the lowest five decimal digits of _debug_idx | |
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60 // will repeat those of _idx. In case this is somehow pathological, |
0 | 61 // we continue to assign negative numbers (!) consecutively. |
62 const int mod = 100000; | |
63 int bump = (int)(_idx - new_debug_idx) % mod; | |
64 if (bump < 0) bump += mod; | |
65 assert(bump >= 0 && bump < mod, ""); | |
66 new_debug_idx += bump; | |
67 } | |
68 Compile::set_debug_idx(new_debug_idx); | |
69 set_debug_idx( new_debug_idx ); | |
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70 assert(Compile::current()->unique() < (UINT_MAX - 1), "Node limit exceeded UINT_MAX"); |
0 | 71 if (BreakAtNode != 0 && (_debug_idx == BreakAtNode || (int)_idx == BreakAtNode)) { |
72 tty->print_cr("BreakAtNode: _idx=%d _debug_idx=%d", _idx, _debug_idx); | |
73 BREAKPOINT; | |
74 } | |
75 #if OPTO_DU_ITERATOR_ASSERT | |
76 _last_del = NULL; | |
77 _del_tick = 0; | |
78 #endif | |
79 _hash_lock = 0; | |
80 } | |
81 | |
82 | |
83 // #ifdef ASSERT ... | |
84 | |
85 #if OPTO_DU_ITERATOR_ASSERT | |
86 void DUIterator_Common::sample(const Node* node) { | |
87 _vdui = VerifyDUIterators; | |
88 _node = node; | |
89 _outcnt = node->_outcnt; | |
90 _del_tick = node->_del_tick; | |
91 _last = NULL; | |
92 } | |
93 | |
94 void DUIterator_Common::verify(const Node* node, bool at_end_ok) { | |
95 assert(_node == node, "consistent iterator source"); | |
96 assert(_del_tick == node->_del_tick, "no unexpected deletions allowed"); | |
97 } | |
98 | |
99 void DUIterator_Common::verify_resync() { | |
100 // Ensure that the loop body has just deleted the last guy produced. | |
101 const Node* node = _node; | |
102 // Ensure that at least one copy of the last-seen edge was deleted. | |
103 // Note: It is OK to delete multiple copies of the last-seen edge. | |
104 // Unfortunately, we have no way to verify that all the deletions delete | |
105 // that same edge. On this point we must use the Honor System. | |
106 assert(node->_del_tick >= _del_tick+1, "must have deleted an edge"); | |
107 assert(node->_last_del == _last, "must have deleted the edge just produced"); | |
108 // We liked this deletion, so accept the resulting outcnt and tick. | |
109 _outcnt = node->_outcnt; | |
110 _del_tick = node->_del_tick; | |
111 } | |
112 | |
113 void DUIterator_Common::reset(const DUIterator_Common& that) { | |
114 if (this == &that) return; // ignore assignment to self | |
115 if (!_vdui) { | |
116 // We need to initialize everything, overwriting garbage values. | |
117 _last = that._last; | |
118 _vdui = that._vdui; | |
119 } | |
120 // Note: It is legal (though odd) for an iterator over some node x | |
121 // to be reassigned to iterate over another node y. Some doubly-nested | |
122 // progress loops depend on being able to do this. | |
123 const Node* node = that._node; | |
124 // Re-initialize everything, except _last. | |
125 _node = node; | |
126 _outcnt = node->_outcnt; | |
127 _del_tick = node->_del_tick; | |
128 } | |
129 | |
130 void DUIterator::sample(const Node* node) { | |
131 DUIterator_Common::sample(node); // Initialize the assertion data. | |
132 _refresh_tick = 0; // No refreshes have happened, as yet. | |
133 } | |
134 | |
135 void DUIterator::verify(const Node* node, bool at_end_ok) { | |
136 DUIterator_Common::verify(node, at_end_ok); | |
137 assert(_idx < node->_outcnt + (uint)at_end_ok, "idx in range"); | |
138 } | |
139 | |
140 void DUIterator::verify_increment() { | |
141 if (_refresh_tick & 1) { | |
142 // We have refreshed the index during this loop. | |
143 // Fix up _idx to meet asserts. | |
144 if (_idx > _outcnt) _idx = _outcnt; | |
145 } | |
146 verify(_node, true); | |
147 } | |
148 | |
149 void DUIterator::verify_resync() { | |
150 // Note: We do not assert on _outcnt, because insertions are OK here. | |
151 DUIterator_Common::verify_resync(); | |
152 // Make sure we are still in sync, possibly with no more out-edges: | |
153 verify(_node, true); | |
154 } | |
155 | |
156 void DUIterator::reset(const DUIterator& that) { | |
157 if (this == &that) return; // self assignment is always a no-op | |
158 assert(that._refresh_tick == 0, "assign only the result of Node::outs()"); | |
159 assert(that._idx == 0, "assign only the result of Node::outs()"); | |
160 assert(_idx == that._idx, "already assigned _idx"); | |
161 if (!_vdui) { | |
162 // We need to initialize everything, overwriting garbage values. | |
163 sample(that._node); | |
164 } else { | |
165 DUIterator_Common::reset(that); | |
166 if (_refresh_tick & 1) { | |
167 _refresh_tick++; // Clear the "was refreshed" flag. | |
168 } | |
169 assert(_refresh_tick < 2*100000, "DU iteration must converge quickly"); | |
170 } | |
171 } | |
172 | |
173 void DUIterator::refresh() { | |
174 DUIterator_Common::sample(_node); // Re-fetch assertion data. | |
175 _refresh_tick |= 1; // Set the "was refreshed" flag. | |
176 } | |
177 | |
178 void DUIterator::verify_finish() { | |
179 // If the loop has killed the node, do not require it to re-run. | |
180 if (_node->_outcnt == 0) _refresh_tick &= ~1; | |
181 // If this assert triggers, it means that a loop used refresh_out_pos | |
182 // to re-synch an iteration index, but the loop did not correctly | |
183 // re-run itself, using a "while (progress)" construct. | |
184 // This iterator enforces the rule that you must keep trying the loop | |
185 // until it "runs clean" without any need for refreshing. | |
186 assert(!(_refresh_tick & 1), "the loop must run once with no refreshing"); | |
187 } | |
188 | |
189 | |
190 void DUIterator_Fast::verify(const Node* node, bool at_end_ok) { | |
191 DUIterator_Common::verify(node, at_end_ok); | |
192 Node** out = node->_out; | |
193 uint cnt = node->_outcnt; | |
194 assert(cnt == _outcnt, "no insertions allowed"); | |
195 assert(_outp >= out && _outp <= out + cnt - !at_end_ok, "outp in range"); | |
196 // This last check is carefully designed to work for NO_OUT_ARRAY. | |
197 } | |
198 | |
199 void DUIterator_Fast::verify_limit() { | |
200 const Node* node = _node; | |
201 verify(node, true); | |
202 assert(_outp == node->_out + node->_outcnt, "limit still correct"); | |
203 } | |
204 | |
205 void DUIterator_Fast::verify_resync() { | |
206 const Node* node = _node; | |
207 if (_outp == node->_out + _outcnt) { | |
208 // Note that the limit imax, not the pointer i, gets updated with the | |
209 // exact count of deletions. (For the pointer it's always "--i".) | |
210 assert(node->_outcnt+node->_del_tick == _outcnt+_del_tick, "no insertions allowed with deletion(s)"); | |
211 // This is a limit pointer, with a name like "imax". | |
212 // Fudge the _last field so that the common assert will be happy. | |
213 _last = (Node*) node->_last_del; | |
214 DUIterator_Common::verify_resync(); | |
215 } else { | |
216 assert(node->_outcnt < _outcnt, "no insertions allowed with deletion(s)"); | |
217 // A normal internal pointer. | |
218 DUIterator_Common::verify_resync(); | |
219 // Make sure we are still in sync, possibly with no more out-edges: | |
220 verify(node, true); | |
221 } | |
222 } | |
223 | |
224 void DUIterator_Fast::verify_relimit(uint n) { | |
225 const Node* node = _node; | |
226 assert((int)n > 0, "use imax -= n only with a positive count"); | |
227 // This must be a limit pointer, with a name like "imax". | |
228 assert(_outp == node->_out + node->_outcnt, "apply -= only to a limit (imax)"); | |
229 // The reported number of deletions must match what the node saw. | |
230 assert(node->_del_tick == _del_tick + n, "must have deleted n edges"); | |
231 // Fudge the _last field so that the common assert will be happy. | |
232 _last = (Node*) node->_last_del; | |
233 DUIterator_Common::verify_resync(); | |
234 } | |
235 | |
236 void DUIterator_Fast::reset(const DUIterator_Fast& that) { | |
237 assert(_outp == that._outp, "already assigned _outp"); | |
238 DUIterator_Common::reset(that); | |
239 } | |
240 | |
241 void DUIterator_Last::verify(const Node* node, bool at_end_ok) { | |
242 // at_end_ok means the _outp is allowed to underflow by 1 | |
243 _outp += at_end_ok; | |
244 DUIterator_Fast::verify(node, at_end_ok); // check _del_tick, etc. | |
245 _outp -= at_end_ok; | |
246 assert(_outp == (node->_out + node->_outcnt) - 1, "pointer must point to end of nodes"); | |
247 } | |
248 | |
249 void DUIterator_Last::verify_limit() { | |
250 // Do not require the limit address to be resynched. | |
251 //verify(node, true); | |
252 assert(_outp == _node->_out, "limit still correct"); | |
253 } | |
254 | |
255 void DUIterator_Last::verify_step(uint num_edges) { | |
256 assert((int)num_edges > 0, "need non-zero edge count for loop progress"); | |
257 _outcnt -= num_edges; | |
258 _del_tick += num_edges; | |
259 // Make sure we are still in sync, possibly with no more out-edges: | |
260 const Node* node = _node; | |
261 verify(node, true); | |
262 assert(node->_last_del == _last, "must have deleted the edge just produced"); | |
263 } | |
264 | |
265 #endif //OPTO_DU_ITERATOR_ASSERT | |
266 | |
267 | |
268 #endif //ASSERT | |
269 | |
270 | |
271 // This constant used to initialize _out may be any non-null value. | |
272 // The value NULL is reserved for the top node only. | |
273 #define NO_OUT_ARRAY ((Node**)-1) | |
274 | |
275 // This funny expression handshakes with Node::operator new | |
276 // to pull Compile::current out of the new node's _out field, | |
277 // and then calls a subroutine which manages most field | |
278 // initializations. The only one which is tricky is the | |
279 // _idx field, which is const, and so must be initialized | |
280 // by a return value, not an assignment. | |
281 // | |
282 // (Aren't you thankful that Java finals don't require so many tricks?) | |
283 #define IDX_INIT(req) this->Init((req), (Compile*) this->_out) | |
284 #ifdef _MSC_VER // the IDX_INIT hack falls foul of warning C4355 | |
285 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
286 #endif | |
287 | |
288 // Out-of-line code from node constructors. | |
289 // Executed only when extra debug info. is being passed around. | |
290 static void init_node_notes(Compile* C, int idx, Node_Notes* nn) { | |
291 C->set_node_notes_at(idx, nn); | |
292 } | |
293 | |
294 // Shared initialization code. | |
295 inline int Node::Init(int req, Compile* C) { | |
296 assert(Compile::current() == C, "must use operator new(Compile*)"); | |
297 int idx = C->next_unique(); | |
298 | |
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299 // Allocate memory for the necessary number of edges. |
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300 if (req > 0) { |
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301 // Allocate space for _in array to have double alignment. |
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302 _in = (Node **) ((char *) (C->node_arena()->Amalloc_D(req * sizeof(void*)))); |
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303 #ifdef ASSERT |
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304 _in[req-1] = this; // magic cookie for assertion check |
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305 #endif |
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306 } |
0 | 307 // If there are default notes floating around, capture them: |
308 Node_Notes* nn = C->default_node_notes(); | |
309 if (nn != NULL) init_node_notes(C, idx, nn); | |
310 | |
311 // Note: At this point, C is dead, | |
312 // and we begin to initialize the new Node. | |
313 | |
314 _cnt = _max = req; | |
315 _outcnt = _outmax = 0; | |
316 _class_id = Class_Node; | |
317 _flags = 0; | |
318 _out = NO_OUT_ARRAY; | |
319 return idx; | |
320 } | |
321 | |
322 //------------------------------Node------------------------------------------- | |
323 // Create a Node, with a given number of required edges. | |
324 Node::Node(uint req) | |
325 : _idx(IDX_INIT(req)) | |
326 { | |
327 assert( req < (uint)(MaxNodeLimit - NodeLimitFudgeFactor), "Input limit exceeded" ); | |
328 debug_only( verify_construction() ); | |
329 NOT_PRODUCT(nodes_created++); | |
330 if (req == 0) { | |
331 assert( _in == (Node**)this, "Must not pass arg count to 'new'" ); | |
332 _in = NULL; | |
333 } else { | |
334 assert( _in[req-1] == this, "Must pass arg count to 'new'" ); | |
335 Node** to = _in; | |
336 for(uint i = 0; i < req; i++) { | |
337 to[i] = NULL; | |
338 } | |
339 } | |
340 } | |
341 | |
342 //------------------------------Node------------------------------------------- | |
343 Node::Node(Node *n0) | |
344 : _idx(IDX_INIT(1)) | |
345 { | |
346 debug_only( verify_construction() ); | |
347 NOT_PRODUCT(nodes_created++); | |
348 // Assert we allocated space for input array already | |
349 assert( _in[0] == this, "Must pass arg count to 'new'" ); | |
350 assert( is_not_dead(n0), "can not use dead node"); | |
351 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
352 } | |
353 | |
354 //------------------------------Node------------------------------------------- | |
355 Node::Node(Node *n0, Node *n1) | |
356 : _idx(IDX_INIT(2)) | |
357 { | |
358 debug_only( verify_construction() ); | |
359 NOT_PRODUCT(nodes_created++); | |
360 // Assert we allocated space for input array already | |
361 assert( _in[1] == this, "Must pass arg count to 'new'" ); | |
362 assert( is_not_dead(n0), "can not use dead node"); | |
363 assert( is_not_dead(n1), "can not use dead node"); | |
364 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
365 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
366 } | |
367 | |
368 //------------------------------Node------------------------------------------- | |
369 Node::Node(Node *n0, Node *n1, Node *n2) | |
370 : _idx(IDX_INIT(3)) | |
371 { | |
372 debug_only( verify_construction() ); | |
373 NOT_PRODUCT(nodes_created++); | |
374 // Assert we allocated space for input array already | |
375 assert( _in[2] == this, "Must pass arg count to 'new'" ); | |
376 assert( is_not_dead(n0), "can not use dead node"); | |
377 assert( is_not_dead(n1), "can not use dead node"); | |
378 assert( is_not_dead(n2), "can not use dead node"); | |
379 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
380 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
381 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
382 } | |
383 | |
384 //------------------------------Node------------------------------------------- | |
385 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3) | |
386 : _idx(IDX_INIT(4)) | |
387 { | |
388 debug_only( verify_construction() ); | |
389 NOT_PRODUCT(nodes_created++); | |
390 // Assert we allocated space for input array already | |
391 assert( _in[3] == this, "Must pass arg count to 'new'" ); | |
392 assert( is_not_dead(n0), "can not use dead node"); | |
393 assert( is_not_dead(n1), "can not use dead node"); | |
394 assert( is_not_dead(n2), "can not use dead node"); | |
395 assert( is_not_dead(n3), "can not use dead node"); | |
396 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
397 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
398 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
399 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); | |
400 } | |
401 | |
402 //------------------------------Node------------------------------------------- | |
403 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3, Node *n4) | |
404 : _idx(IDX_INIT(5)) | |
405 { | |
406 debug_only( verify_construction() ); | |
407 NOT_PRODUCT(nodes_created++); | |
408 // Assert we allocated space for input array already | |
409 assert( _in[4] == this, "Must pass arg count to 'new'" ); | |
410 assert( is_not_dead(n0), "can not use dead node"); | |
411 assert( is_not_dead(n1), "can not use dead node"); | |
412 assert( is_not_dead(n2), "can not use dead node"); | |
413 assert( is_not_dead(n3), "can not use dead node"); | |
414 assert( is_not_dead(n4), "can not use dead node"); | |
415 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
416 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
417 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
418 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); | |
419 _in[4] = n4; if (n4 != NULL) n4->add_out((Node *)this); | |
420 } | |
421 | |
422 //------------------------------Node------------------------------------------- | |
423 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3, | |
424 Node *n4, Node *n5) | |
425 : _idx(IDX_INIT(6)) | |
426 { | |
427 debug_only( verify_construction() ); | |
428 NOT_PRODUCT(nodes_created++); | |
429 // Assert we allocated space for input array already | |
430 assert( _in[5] == this, "Must pass arg count to 'new'" ); | |
431 assert( is_not_dead(n0), "can not use dead node"); | |
432 assert( is_not_dead(n1), "can not use dead node"); | |
433 assert( is_not_dead(n2), "can not use dead node"); | |
434 assert( is_not_dead(n3), "can not use dead node"); | |
435 assert( is_not_dead(n4), "can not use dead node"); | |
436 assert( is_not_dead(n5), "can not use dead node"); | |
437 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
438 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
439 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
440 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); | |
441 _in[4] = n4; if (n4 != NULL) n4->add_out((Node *)this); | |
442 _in[5] = n5; if (n5 != NULL) n5->add_out((Node *)this); | |
443 } | |
444 | |
445 //------------------------------Node------------------------------------------- | |
446 Node::Node(Node *n0, Node *n1, Node *n2, Node *n3, | |
447 Node *n4, Node *n5, Node *n6) | |
448 : _idx(IDX_INIT(7)) | |
449 { | |
450 debug_only( verify_construction() ); | |
451 NOT_PRODUCT(nodes_created++); | |
452 // Assert we allocated space for input array already | |
453 assert( _in[6] == this, "Must pass arg count to 'new'" ); | |
454 assert( is_not_dead(n0), "can not use dead node"); | |
455 assert( is_not_dead(n1), "can not use dead node"); | |
456 assert( is_not_dead(n2), "can not use dead node"); | |
457 assert( is_not_dead(n3), "can not use dead node"); | |
458 assert( is_not_dead(n4), "can not use dead node"); | |
459 assert( is_not_dead(n5), "can not use dead node"); | |
460 assert( is_not_dead(n6), "can not use dead node"); | |
461 _in[0] = n0; if (n0 != NULL) n0->add_out((Node *)this); | |
462 _in[1] = n1; if (n1 != NULL) n1->add_out((Node *)this); | |
463 _in[2] = n2; if (n2 != NULL) n2->add_out((Node *)this); | |
464 _in[3] = n3; if (n3 != NULL) n3->add_out((Node *)this); | |
465 _in[4] = n4; if (n4 != NULL) n4->add_out((Node *)this); | |
466 _in[5] = n5; if (n5 != NULL) n5->add_out((Node *)this); | |
467 _in[6] = n6; if (n6 != NULL) n6->add_out((Node *)this); | |
468 } | |
469 | |
470 | |
471 //------------------------------clone------------------------------------------ | |
472 // Clone a Node. | |
473 Node *Node::clone() const { | |
474 Compile *compile = Compile::current(); | |
475 uint s = size_of(); // Size of inherited Node | |
476 Node *n = (Node*)compile->node_arena()->Amalloc_D(size_of() + _max*sizeof(Node*)); | |
477 Copy::conjoint_words_to_lower((HeapWord*)this, (HeapWord*)n, s); | |
478 // Set the new input pointer array | |
479 n->_in = (Node**)(((char*)n)+s); | |
480 // Cannot share the old output pointer array, so kill it | |
481 n->_out = NO_OUT_ARRAY; | |
482 // And reset the counters to 0 | |
483 n->_outcnt = 0; | |
484 n->_outmax = 0; | |
485 // Unlock this guy, since he is not in any hash table. | |
486 debug_only(n->_hash_lock = 0); | |
487 // Walk the old node's input list to duplicate its edges | |
488 uint i; | |
489 for( i = 0; i < len(); i++ ) { | |
490 Node *x = in(i); | |
491 n->_in[i] = x; | |
492 if (x != NULL) x->add_out(n); | |
493 } | |
494 if (is_macro()) | |
495 compile->add_macro_node(n); | |
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496 if (is_expensive()) |
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497 compile->add_expensive_node(n); |
0 | 498 |
499 n->set_idx(compile->next_unique()); // Get new unique index as well | |
500 debug_only( n->verify_construction() ); | |
501 NOT_PRODUCT(nodes_created++); | |
502 // Do not patch over the debug_idx of a clone, because it makes it | |
503 // impossible to break on the clone's moment of creation. | |
504 //debug_only( n->set_debug_idx( debug_idx() ) ); | |
505 | |
506 compile->copy_node_notes_to(n, (Node*) this); | |
507 | |
508 // MachNode clone | |
509 uint nopnds; | |
510 if (this->is_Mach() && (nopnds = this->as_Mach()->num_opnds()) > 0) { | |
511 MachNode *mach = n->as_Mach(); | |
512 MachNode *mthis = this->as_Mach(); | |
513 // Get address of _opnd_array. | |
514 // It should be the same offset since it is the clone of this node. | |
515 MachOper **from = mthis->_opnds; | |
516 MachOper **to = (MachOper **)((size_t)(&mach->_opnds) + | |
517 pointer_delta((const void*)from, | |
518 (const void*)(&mthis->_opnds), 1)); | |
519 mach->_opnds = to; | |
520 for ( uint i = 0; i < nopnds; ++i ) { | |
521 to[i] = from[i]->clone(compile); | |
522 } | |
523 } | |
524 // cloning CallNode may need to clone JVMState | |
525 if (n->is_Call()) { | |
526 CallNode *call = n->as_Call(); | |
527 call->clone_jvms(); | |
528 } | |
529 return n; // Return the clone | |
530 } | |
531 | |
532 //---------------------------setup_is_top-------------------------------------- | |
533 // Call this when changing the top node, to reassert the invariants | |
534 // required by Node::is_top. See Compile::set_cached_top_node. | |
535 void Node::setup_is_top() { | |
536 if (this == (Node*)Compile::current()->top()) { | |
537 // This node has just become top. Kill its out array. | |
538 _outcnt = _outmax = 0; | |
539 _out = NULL; // marker value for top | |
540 assert(is_top(), "must be top"); | |
541 } else { | |
542 if (_out == NULL) _out = NO_OUT_ARRAY; | |
543 assert(!is_top(), "must not be top"); | |
544 } | |
545 } | |
546 | |
547 | |
548 //------------------------------~Node------------------------------------------ | |
549 // Fancy destructor; eagerly attempt to reclaim Node numberings and storage | |
550 extern int reclaim_idx ; | |
551 extern int reclaim_in ; | |
552 extern int reclaim_node; | |
553 void Node::destruct() { | |
554 // Eagerly reclaim unique Node numberings | |
555 Compile* compile = Compile::current(); | |
556 if ((uint)_idx+1 == compile->unique()) { | |
557 compile->set_unique(compile->unique()-1); | |
558 #ifdef ASSERT | |
559 reclaim_idx++; | |
560 #endif | |
561 } | |
562 // Clear debug info: | |
563 Node_Notes* nn = compile->node_notes_at(_idx); | |
564 if (nn != NULL) nn->clear(); | |
565 // Walk the input array, freeing the corresponding output edges | |
566 _cnt = _max; // forget req/prec distinction | |
567 uint i; | |
568 for( i = 0; i < _max; i++ ) { | |
569 set_req(i, NULL); | |
570 //assert(def->out(def->outcnt()-1) == (Node *)this,"bad def-use hacking in reclaim"); | |
571 } | |
572 assert(outcnt() == 0, "deleting a node must not leave a dangling use"); | |
573 // See if the input array was allocated just prior to the object | |
574 int edge_size = _max*sizeof(void*); | |
575 int out_edge_size = _outmax*sizeof(void*); | |
576 char *edge_end = ((char*)_in) + edge_size; | |
577 char *out_array = (char*)(_out == NO_OUT_ARRAY? NULL: _out); | |
578 char *out_edge_end = out_array + out_edge_size; | |
579 int node_size = size_of(); | |
580 | |
581 // Free the output edge array | |
582 if (out_edge_size > 0) { | |
583 #ifdef ASSERT | |
584 if( out_edge_end == compile->node_arena()->hwm() ) | |
585 reclaim_in += out_edge_size; // count reclaimed out edges with in edges | |
586 #endif | |
587 compile->node_arena()->Afree(out_array, out_edge_size); | |
588 } | |
589 | |
590 // Free the input edge array and the node itself | |
591 if( edge_end == (char*)this ) { | |
592 #ifdef ASSERT | |
593 if( edge_end+node_size == compile->node_arena()->hwm() ) { | |
594 reclaim_in += edge_size; | |
595 reclaim_node+= node_size; | |
596 } | |
597 #else | |
598 // It was; free the input array and object all in one hit | |
599 compile->node_arena()->Afree(_in,edge_size+node_size); | |
600 #endif | |
601 } else { | |
602 | |
603 // Free just the input array | |
604 #ifdef ASSERT | |
605 if( edge_end == compile->node_arena()->hwm() ) | |
606 reclaim_in += edge_size; | |
607 #endif | |
608 compile->node_arena()->Afree(_in,edge_size); | |
609 | |
610 // Free just the object | |
611 #ifdef ASSERT | |
612 if( ((char*)this) + node_size == compile->node_arena()->hwm() ) | |
613 reclaim_node+= node_size; | |
614 #else | |
615 compile->node_arena()->Afree(this,node_size); | |
616 #endif | |
617 } | |
618 if (is_macro()) { | |
619 compile->remove_macro_node(this); | |
620 } | |
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621 if (is_expensive()) { |
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622 compile->remove_expensive_node(this); |
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623 } |
0 | 624 #ifdef ASSERT |
625 // We will not actually delete the storage, but we'll make the node unusable. | |
626 *(address*)this = badAddress; // smash the C++ vtbl, probably | |
627 _in = _out = (Node**) badAddress; | |
628 _max = _cnt = _outmax = _outcnt = 0; | |
629 #endif | |
630 } | |
631 | |
632 //------------------------------grow------------------------------------------- | |
633 // Grow the input array, making space for more edges | |
634 void Node::grow( uint len ) { | |
635 Arena* arena = Compile::current()->node_arena(); | |
636 uint new_max = _max; | |
637 if( new_max == 0 ) { | |
638 _max = 4; | |
639 _in = (Node**)arena->Amalloc(4*sizeof(Node*)); | |
640 Node** to = _in; | |
641 to[0] = NULL; | |
642 to[1] = NULL; | |
643 to[2] = NULL; | |
644 to[3] = NULL; | |
645 return; | |
646 } | |
647 while( new_max <= len ) new_max <<= 1; // Find next power-of-2 | |
648 // Trimming to limit allows a uint8 to handle up to 255 edges. | |
649 // Previously I was using only powers-of-2 which peaked at 128 edges. | |
650 //if( new_max >= limit ) new_max = limit-1; | |
651 _in = (Node**)arena->Arealloc(_in, _max*sizeof(Node*), new_max*sizeof(Node*)); | |
652 Copy::zero_to_bytes(&_in[_max], (new_max-_max)*sizeof(Node*)); // NULL all new space | |
653 _max = new_max; // Record new max length | |
654 // This assertion makes sure that Node::_max is wide enough to | |
655 // represent the numerical value of new_max. | |
656 assert(_max == new_max && _max > len, "int width of _max is too small"); | |
657 } | |
658 | |
659 //-----------------------------out_grow---------------------------------------- | |
660 // Grow the input array, making space for more edges | |
661 void Node::out_grow( uint len ) { | |
662 assert(!is_top(), "cannot grow a top node's out array"); | |
663 Arena* arena = Compile::current()->node_arena(); | |
664 uint new_max = _outmax; | |
665 if( new_max == 0 ) { | |
666 _outmax = 4; | |
667 _out = (Node **)arena->Amalloc(4*sizeof(Node*)); | |
668 return; | |
669 } | |
670 while( new_max <= len ) new_max <<= 1; // Find next power-of-2 | |
671 // Trimming to limit allows a uint8 to handle up to 255 edges. | |
672 // Previously I was using only powers-of-2 which peaked at 128 edges. | |
673 //if( new_max >= limit ) new_max = limit-1; | |
674 assert(_out != NULL && _out != NO_OUT_ARRAY, "out must have sensible value"); | |
675 _out = (Node**)arena->Arealloc(_out,_outmax*sizeof(Node*),new_max*sizeof(Node*)); | |
676 //Copy::zero_to_bytes(&_out[_outmax], (new_max-_outmax)*sizeof(Node*)); // NULL all new space | |
677 _outmax = new_max; // Record new max length | |
678 // This assertion makes sure that Node::_max is wide enough to | |
679 // represent the numerical value of new_max. | |
680 assert(_outmax == new_max && _outmax > len, "int width of _outmax is too small"); | |
681 } | |
682 | |
683 #ifdef ASSERT | |
684 //------------------------------is_dead---------------------------------------- | |
685 bool Node::is_dead() const { | |
686 // Mach and pinch point nodes may look like dead. | |
687 if( is_top() || is_Mach() || (Opcode() == Op_Node && _outcnt > 0) ) | |
688 return false; | |
689 for( uint i = 0; i < _max; i++ ) | |
690 if( _in[i] != NULL ) | |
691 return false; | |
692 dump(); | |
693 return true; | |
694 } | |
695 #endif | |
696 | |
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697 |
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698 //------------------------------is_unreachable--------------------------------- |
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699 bool Node::is_unreachable(PhaseIterGVN &igvn) const { |
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700 assert(!is_Mach(), "doesn't work with MachNodes"); |
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701 return outcnt() == 0 || igvn.type(this) == Type::TOP || in(0)->is_top(); |
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702 } |
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703 |
0 | 704 //------------------------------add_req---------------------------------------- |
705 // Add a new required input at the end | |
706 void Node::add_req( Node *n ) { | |
707 assert( is_not_dead(n), "can not use dead node"); | |
708 | |
709 // Look to see if I can move precedence down one without reallocating | |
710 if( (_cnt >= _max) || (in(_max-1) != NULL) ) | |
711 grow( _max+1 ); | |
712 | |
713 // Find a precedence edge to move | |
714 if( in(_cnt) != NULL ) { // Next precedence edge is busy? | |
715 uint i; | |
716 for( i=_cnt; i<_max; i++ ) | |
717 if( in(i) == NULL ) // Find the NULL at end of prec edge list | |
718 break; // There must be one, since we grew the array | |
719 _in[i] = in(_cnt); // Move prec over, making space for req edge | |
720 } | |
721 _in[_cnt++] = n; // Stuff over old prec edge | |
722 if (n != NULL) n->add_out((Node *)this); | |
723 } | |
724 | |
725 //---------------------------add_req_batch------------------------------------- | |
726 // Add a new required input at the end | |
727 void Node::add_req_batch( Node *n, uint m ) { | |
728 assert( is_not_dead(n), "can not use dead node"); | |
729 // check various edge cases | |
730 if ((int)m <= 1) { | |
731 assert((int)m >= 0, "oob"); | |
732 if (m != 0) add_req(n); | |
733 return; | |
734 } | |
735 | |
736 // Look to see if I can move precedence down one without reallocating | |
737 if( (_cnt+m) > _max || _in[_max-m] ) | |
738 grow( _max+m ); | |
739 | |
740 // Find a precedence edge to move | |
741 if( _in[_cnt] != NULL ) { // Next precedence edge is busy? | |
742 uint i; | |
743 for( i=_cnt; i<_max; i++ ) | |
744 if( _in[i] == NULL ) // Find the NULL at end of prec edge list | |
745 break; // There must be one, since we grew the array | |
746 // Slide all the precs over by m positions (assume #prec << m). | |
747 Copy::conjoint_words_to_higher((HeapWord*)&_in[_cnt], (HeapWord*)&_in[_cnt+m], ((i-_cnt)*sizeof(Node*))); | |
748 } | |
749 | |
750 // Stuff over the old prec edges | |
751 for(uint i=0; i<m; i++ ) { | |
752 _in[_cnt++] = n; | |
753 } | |
754 | |
755 // Insert multiple out edges on the node. | |
756 if (n != NULL && !n->is_top()) { | |
757 for(uint i=0; i<m; i++ ) { | |
758 n->add_out((Node *)this); | |
759 } | |
760 } | |
761 } | |
762 | |
763 //------------------------------del_req---------------------------------------- | |
764 // Delete the required edge and compact the edge array | |
765 void Node::del_req( uint idx ) { | |
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766 assert( idx < _cnt, "oob"); |
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767 assert( !VerifyHashTableKeys || _hash_lock == 0, |
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768 "remove node from hash table before modifying it"); |
0 | 769 // First remove corresponding def-use edge |
770 Node *n = in(idx); | |
771 if (n != NULL) n->del_out((Node *)this); | |
772 _in[idx] = in(--_cnt); // Compact the array | |
773 _in[_cnt] = NULL; // NULL out emptied slot | |
774 } | |
775 | |
776 //------------------------------ins_req---------------------------------------- | |
777 // Insert a new required input at the end | |
778 void Node::ins_req( uint idx, Node *n ) { | |
779 assert( is_not_dead(n), "can not use dead node"); | |
780 add_req(NULL); // Make space | |
781 assert( idx < _max, "Must have allocated enough space"); | |
782 // Slide over | |
783 if(_cnt-idx-1 > 0) { | |
784 Copy::conjoint_words_to_higher((HeapWord*)&_in[idx], (HeapWord*)&_in[idx+1], ((_cnt-idx-1)*sizeof(Node*))); | |
785 } | |
786 _in[idx] = n; // Stuff over old required edge | |
787 if (n != NULL) n->add_out((Node *)this); // Add reciprocal def-use edge | |
788 } | |
789 | |
790 //-----------------------------find_edge--------------------------------------- | |
791 int Node::find_edge(Node* n) { | |
792 for (uint i = 0; i < len(); i++) { | |
793 if (_in[i] == n) return i; | |
794 } | |
795 return -1; | |
796 } | |
797 | |
798 //----------------------------replace_edge------------------------------------- | |
799 int Node::replace_edge(Node* old, Node* neww) { | |
800 if (old == neww) return 0; // nothing to do | |
801 uint nrep = 0; | |
802 for (uint i = 0; i < len(); i++) { | |
803 if (in(i) == old) { | |
804 if (i < req()) | |
805 set_req(i, neww); | |
806 else | |
807 set_prec(i, neww); | |
808 nrep++; | |
809 } | |
810 } | |
811 return nrep; | |
812 } | |
813 | |
814 //-------------------------disconnect_inputs----------------------------------- | |
815 // NULL out all inputs to eliminate incoming Def-Use edges. | |
816 // Return the number of edges between 'n' and 'this' | |
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817 int Node::disconnect_inputs(Node *n, Compile* C) { |
0 | 818 int edges_to_n = 0; |
819 | |
820 uint cnt = req(); | |
821 for( uint i = 0; i < cnt; ++i ) { | |
822 if( in(i) == 0 ) continue; | |
823 if( in(i) == n ) ++edges_to_n; | |
824 set_req(i, NULL); | |
825 } | |
826 // Remove precedence edges if any exist | |
827 // Note: Safepoints may have precedence edges, even during parsing | |
828 if( (req() != len()) && (in(req()) != NULL) ) { | |
829 uint max = len(); | |
830 for( uint i = 0; i < max; ++i ) { | |
831 if( in(i) == 0 ) continue; | |
832 if( in(i) == n ) ++edges_to_n; | |
833 set_prec(i, NULL); | |
834 } | |
835 } | |
836 | |
837 // Node::destruct requires all out edges be deleted first | |
838 // debug_only(destruct();) // no reuse benefit expected | |
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839 if (edges_to_n == 0) { |
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840 C->record_dead_node(_idx); |
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841 } |
0 | 842 return edges_to_n; |
843 } | |
844 | |
845 //-----------------------------uncast--------------------------------------- | |
846 // %%% Temporary, until we sort out CheckCastPP vs. CastPP. | |
847 // Strip away casting. (It is depth-limited.) | |
848 Node* Node::uncast() const { | |
849 // Should be inline: | |
850 //return is_ConstraintCast() ? uncast_helper(this) : (Node*) this; | |
65 | 851 if (is_ConstraintCast() || is_CheckCastPP()) |
0 | 852 return uncast_helper(this); |
853 else | |
854 return (Node*) this; | |
855 } | |
856 | |
857 //---------------------------uncast_helper------------------------------------- | |
858 Node* Node::uncast_helper(const Node* p) { | |
4778 | 859 #ifdef ASSERT |
860 uint depth_count = 0; | |
861 const Node* orig_p = p; | |
862 #endif | |
863 | |
864 while (true) { | |
865 #ifdef ASSERT | |
866 if (depth_count >= K) { | |
867 orig_p->dump(4); | |
868 if (p != orig_p) | |
869 p->dump(1); | |
870 } | |
871 assert(depth_count++ < K, "infinite loop in Node::uncast_helper"); | |
872 #endif | |
0 | 873 if (p == NULL || p->req() != 2) { |
874 break; | |
875 } else if (p->is_ConstraintCast()) { | |
876 p = p->in(1); | |
65 | 877 } else if (p->is_CheckCastPP()) { |
0 | 878 p = p->in(1); |
879 } else { | |
880 break; | |
881 } | |
882 } | |
883 return (Node*) p; | |
884 } | |
885 | |
886 //------------------------------add_prec--------------------------------------- | |
887 // Add a new precedence input. Precedence inputs are unordered, with | |
888 // duplicates removed and NULLs packed down at the end. | |
889 void Node::add_prec( Node *n ) { | |
890 assert( is_not_dead(n), "can not use dead node"); | |
891 | |
892 // Check for NULL at end | |
893 if( _cnt >= _max || in(_max-1) ) | |
894 grow( _max+1 ); | |
895 | |
896 // Find a precedence edge to move | |
897 uint i = _cnt; | |
898 while( in(i) != NULL ) i++; | |
899 _in[i] = n; // Stuff prec edge over NULL | |
900 if ( n != NULL) n->add_out((Node *)this); // Add mirror edge | |
901 } | |
902 | |
903 //------------------------------rm_prec---------------------------------------- | |
904 // Remove a precedence input. Precedence inputs are unordered, with | |
905 // duplicates removed and NULLs packed down at the end. | |
906 void Node::rm_prec( uint j ) { | |
907 | |
908 // Find end of precedence list to pack NULLs | |
909 uint i; | |
910 for( i=j; i<_max; i++ ) | |
911 if( !_in[i] ) // Find the NULL at end of prec edge list | |
912 break; | |
913 if (_in[j] != NULL) _in[j]->del_out((Node *)this); | |
914 _in[j] = _in[--i]; // Move last element over removed guy | |
915 _in[i] = NULL; // NULL out last element | |
916 } | |
917 | |
918 //------------------------------size_of---------------------------------------- | |
919 uint Node::size_of() const { return sizeof(*this); } | |
920 | |
921 //------------------------------ideal_reg-------------------------------------- | |
922 uint Node::ideal_reg() const { return 0; } | |
923 | |
924 //------------------------------jvms------------------------------------------- | |
925 JVMState* Node::jvms() const { return NULL; } | |
926 | |
927 #ifdef ASSERT | |
928 //------------------------------jvms------------------------------------------- | |
929 bool Node::verify_jvms(const JVMState* using_jvms) const { | |
930 for (JVMState* jvms = this->jvms(); jvms != NULL; jvms = jvms->caller()) { | |
931 if (jvms == using_jvms) return true; | |
932 } | |
933 return false; | |
934 } | |
935 | |
936 //------------------------------init_NodeProperty------------------------------ | |
937 void Node::init_NodeProperty() { | |
938 assert(_max_classes <= max_jushort, "too many NodeProperty classes"); | |
939 assert(_max_flags <= max_jushort, "too many NodeProperty flags"); | |
940 } | |
941 #endif | |
942 | |
943 //------------------------------format----------------------------------------- | |
944 // Print as assembly | |
945 void Node::format( PhaseRegAlloc *, outputStream *st ) const {} | |
946 //------------------------------emit------------------------------------------- | |
947 // Emit bytes starting at parameter 'ptr'. | |
948 void Node::emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const {} | |
949 //------------------------------size------------------------------------------- | |
950 // Size of instruction in bytes | |
951 uint Node::size(PhaseRegAlloc *ra_) const { return 0; } | |
952 | |
953 //------------------------------CFG Construction------------------------------- | |
954 // Nodes that end basic blocks, e.g. IfTrue/IfFalse, JumpProjNode, Root, | |
955 // Goto and Return. | |
956 const Node *Node::is_block_proj() const { return 0; } | |
957 | |
958 // Minimum guaranteed type | |
959 const Type *Node::bottom_type() const { return Type::BOTTOM; } | |
960 | |
961 | |
962 //------------------------------raise_bottom_type------------------------------ | |
963 // Get the worst-case Type output for this Node. | |
964 void Node::raise_bottom_type(const Type* new_type) { | |
965 if (is_Type()) { | |
966 TypeNode *n = this->as_Type(); | |
967 if (VerifyAliases) { | |
968 assert(new_type->higher_equal(n->type()), "new type must refine old type"); | |
969 } | |
970 n->set_type(new_type); | |
971 } else if (is_Load()) { | |
972 LoadNode *n = this->as_Load(); | |
973 if (VerifyAliases) { | |
974 assert(new_type->higher_equal(n->type()), "new type must refine old type"); | |
975 } | |
976 n->set_type(new_type); | |
977 } | |
978 } | |
979 | |
980 //------------------------------Identity--------------------------------------- | |
981 // Return a node that the given node is equivalent to. | |
982 Node *Node::Identity( PhaseTransform * ) { | |
983 return this; // Default to no identities | |
984 } | |
985 | |
986 //------------------------------Value------------------------------------------ | |
987 // Compute a new Type for a node using the Type of the inputs. | |
988 const Type *Node::Value( PhaseTransform * ) const { | |
989 return bottom_type(); // Default to worst-case Type | |
990 } | |
991 | |
992 //------------------------------Ideal------------------------------------------ | |
993 // | |
994 // 'Idealize' the graph rooted at this Node. | |
995 // | |
996 // In order to be efficient and flexible there are some subtle invariants | |
997 // these Ideal calls need to hold. Running with '+VerifyIterativeGVN' checks | |
998 // these invariants, although its too slow to have on by default. If you are | |
999 // hacking an Ideal call, be sure to test with +VerifyIterativeGVN! | |
1000 // | |
1001 // The Ideal call almost arbitrarily reshape the graph rooted at the 'this' | |
1002 // pointer. If ANY change is made, it must return the root of the reshaped | |
1003 // graph - even if the root is the same Node. Example: swapping the inputs | |
1004 // to an AddINode gives the same answer and same root, but you still have to | |
1005 // return the 'this' pointer instead of NULL. | |
1006 // | |
1007 // You cannot return an OLD Node, except for the 'this' pointer. Use the | |
1008 // Identity call to return an old Node; basically if Identity can find | |
1009 // another Node have the Ideal call make no change and return NULL. | |
1010 // Example: AddINode::Ideal must check for add of zero; in this case it | |
1011 // returns NULL instead of doing any graph reshaping. | |
1012 // | |
1013 // You cannot modify any old Nodes except for the 'this' pointer. Due to | |
1014 // sharing there may be other users of the old Nodes relying on their current | |
1015 // semantics. Modifying them will break the other users. | |
1016 // Example: when reshape "(X+3)+4" into "X+7" you must leave the Node for | |
1017 // "X+3" unchanged in case it is shared. | |
1018 // | |
605 | 1019 // If you modify the 'this' pointer's inputs, you should use |
1020 // 'set_req'. If you are making a new Node (either as the new root or | |
1021 // some new internal piece) you may use 'init_req' to set the initial | |
1022 // value. You can make a new Node with either 'new' or 'clone'. In | |
1023 // either case, def-use info is correctly maintained. | |
1024 // | |
0 | 1025 // Example: reshape "(X+3)+4" into "X+7": |
605 | 1026 // set_req(1, in(1)->in(1)); |
1027 // set_req(2, phase->intcon(7)); | |
0 | 1028 // return this; |
605 | 1029 // Example: reshape "X*4" into "X<<2" |
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1030 // return new (C) LShiftINode(in(1), phase->intcon(2)); |
0 | 1031 // |
1032 // You must call 'phase->transform(X)' on any new Nodes X you make, except | |
605 | 1033 // for the returned root node. Example: reshape "X*31" with "(X<<5)-X". |
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1034 // Node *shift=phase->transform(new(C)LShiftINode(in(1),phase->intcon(5))); |
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1035 // return new (C) AddINode(shift, in(1)); |
0 | 1036 // |
1037 // When making a Node for a constant use 'phase->makecon' or 'phase->intcon'. | |
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1038 // These forms are faster than 'phase->transform(new (C) ConNode())' and Do |
0 | 1039 // The Right Thing with def-use info. |
1040 // | |
1041 // You cannot bury the 'this' Node inside of a graph reshape. If the reshaped | |
1042 // graph uses the 'this' Node it must be the root. If you want a Node with | |
1043 // the same Opcode as the 'this' pointer use 'clone'. | |
1044 // | |
1045 Node *Node::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1046 return NULL; // Default to being Ideal already | |
1047 } | |
1048 | |
1049 // Some nodes have specific Ideal subgraph transformations only if they are | |
1050 // unique users of specific nodes. Such nodes should be put on IGVN worklist | |
1051 // for the transformations to happen. | |
1052 bool Node::has_special_unique_user() const { | |
1053 assert(outcnt() == 1, "match only for unique out"); | |
1054 Node* n = unique_out(); | |
1055 int op = Opcode(); | |
1056 if( this->is_Store() ) { | |
1057 // Condition for back-to-back stores folding. | |
1058 return n->Opcode() == op && n->in(MemNode::Memory) == this; | |
1059 } else if( op == Op_AddL ) { | |
1060 // Condition for convL2I(addL(x,y)) ==> addI(convL2I(x),convL2I(y)) | |
1061 return n->Opcode() == Op_ConvL2I && n->in(1) == this; | |
1062 } else if( op == Op_SubI || op == Op_SubL ) { | |
1063 // Condition for subI(x,subI(y,z)) ==> subI(addI(x,z),y) | |
1064 return n->Opcode() == op && n->in(2) == this; | |
1065 } | |
1066 return false; | |
1067 }; | |
1068 | |
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1069 //--------------------------find_exact_control--------------------------------- |
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1070 // Skip Proj and CatchProj nodes chains. Check for Null and Top. |
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1071 Node* Node::find_exact_control(Node* ctrl) { |
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1072 if (ctrl == NULL && this->is_Region()) |
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1073 ctrl = this->as_Region()->is_copy(); |
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1074 |
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1075 if (ctrl != NULL && ctrl->is_CatchProj()) { |
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1076 if (ctrl->as_CatchProj()->_con == CatchProjNode::fall_through_index) |
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1077 ctrl = ctrl->in(0); |
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1078 if (ctrl != NULL && !ctrl->is_top()) |
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1079 ctrl = ctrl->in(0); |
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1080 } |
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1081 |
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1082 if (ctrl != NULL && ctrl->is_Proj()) |
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1083 ctrl = ctrl->in(0); |
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1084 |
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1085 return ctrl; |
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1086 } |
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1087 |
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1088 //--------------------------dominates------------------------------------------ |
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1089 // Helper function for MemNode::all_controls_dominate(). |
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1090 // Check if 'this' control node dominates or equal to 'sub' control node. |
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1091 // We already know that if any path back to Root or Start reaches 'this', |
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1092 // then all paths so, so this is a simple search for one example, |
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1093 // not an exhaustive search for a counterexample. |
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1094 bool Node::dominates(Node* sub, Node_List &nlist) { |
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1095 assert(this->is_CFG(), "expecting control"); |
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1096 assert(sub != NULL && sub->is_CFG(), "expecting control"); |
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1097 |
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1098 // detect dead cycle without regions |
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1099 int iterations_without_region_limit = DominatorSearchLimit; |
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1100 |
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1101 Node* orig_sub = sub; |
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1102 Node* dom = this; |
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1103 bool met_dom = false; |
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1104 nlist.clear(); |
163 | 1105 |
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1106 // Walk 'sub' backward up the chain to 'dom', watching for regions. |
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1107 // After seeing 'dom', continue up to Root or Start. |
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1108 // If we hit a region (backward split point), it may be a loop head. |
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1109 // Keep going through one of the region's inputs. If we reach the |
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1110 // same region again, go through a different input. Eventually we |
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1111 // will either exit through the loop head, or give up. |
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1112 // (If we get confused, break out and return a conservative 'false'.) |
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1113 while (sub != NULL) { |
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1114 if (sub->is_top()) break; // Conservative answer for dead code. |
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1115 if (sub == dom) { |
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1116 if (nlist.size() == 0) { |
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1117 // No Region nodes except loops were visited before and the EntryControl |
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1118 // path was taken for loops: it did not walk in a cycle. |
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1119 return true; |
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1120 } else if (met_dom) { |
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1121 break; // already met before: walk in a cycle |
163 | 1122 } else { |
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1123 // Region nodes were visited. Continue walk up to Start or Root |
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1124 // to make sure that it did not walk in a cycle. |
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1125 met_dom = true; // first time meet |
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1126 iterations_without_region_limit = DominatorSearchLimit; // Reset |
163 | 1127 } |
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1128 } |
163 | 1129 if (sub->is_Start() || sub->is_Root()) { |
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1130 // Success if we met 'dom' along a path to Start or Root. |
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1131 // We assume there are no alternative paths that avoid 'dom'. |
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1132 // (This assumption is up to the caller to ensure!) |
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1133 return met_dom; |
163 | 1134 } |
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1135 Node* up = sub->in(0); |
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1136 // Normalize simple pass-through regions and projections: |
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1137 up = sub->find_exact_control(up); |
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1138 // If sub == up, we found a self-loop. Try to push past it. |
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1139 if (sub == up && sub->is_Loop()) { |
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1140 // Take loop entry path on the way up to 'dom'. |
163 | 1141 up = sub->in(1); // in(LoopNode::EntryControl); |
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1142 } else if (sub == up && sub->is_Region() && sub->req() != 3) { |
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1143 // Always take in(1) path on the way up to 'dom' for clone regions |
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1144 // (with only one input) or regions which merge > 2 paths |
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1145 // (usually used to merge fast/slow paths). |
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1146 up = sub->in(1); |
163 | 1147 } else if (sub == up && sub->is_Region()) { |
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1148 // Try both paths for Regions with 2 input paths (it may be a loop head). |
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1149 // It could give conservative 'false' answer without information |
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1150 // which region's input is the entry path. |
163 | 1151 iterations_without_region_limit = DominatorSearchLimit; // Reset |
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1152 |
163 | 1153 bool region_was_visited_before = false; |
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1154 // Was this Region node visited before? |
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1155 // If so, we have reached it because we accidentally took a |
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1156 // loop-back edge from 'sub' back into the body of the loop, |
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1157 // and worked our way up again to the loop header 'sub'. |
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1158 // So, take the first unexplored path on the way up to 'dom'. |
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1159 for (int j = nlist.size() - 1; j >= 0; j--) { |
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1160 intptr_t ni = (intptr_t)nlist.at(j); |
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1161 Node* visited = (Node*)(ni & ~1); |
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1162 bool visited_twice_already = ((ni & 1) != 0); |
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1163 if (visited == sub) { |
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1164 if (visited_twice_already) { |
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1165 // Visited 2 paths, but still stuck in loop body. Give up. |
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1166 return false; |
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1167 } |
193
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1168 // The Region node was visited before only once. |
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1169 // (We will repush with the low bit set, below.) |
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1170 nlist.remove(j); |
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1171 // We will find a new edge and re-insert. |
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1172 region_was_visited_before = true; |
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1173 break; |
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1174 } |
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1175 } |
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1176 |
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1177 // Find an incoming edge which has not been seen yet; walk through it. |
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1178 assert(up == sub, ""); |
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1179 uint skip = region_was_visited_before ? 1 : 0; |
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1180 for (uint i = 1; i < sub->req(); i++) { |
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1181 Node* in = sub->in(i); |
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1182 if (in != NULL && !in->is_top() && in != sub) { |
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1183 if (skip == 0) { |
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1184 up = in; |
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1185 break; |
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1186 } |
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1187 --skip; // skip this nontrivial input |
163 | 1188 } |
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1189 } |
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1190 |
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1191 // Set 0 bit to indicate that both paths were taken. |
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1192 nlist.push((Node*)((intptr_t)sub + (region_was_visited_before ? 1 : 0))); |
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1193 } |
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1194 |
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1195 if (up == sub) { |
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1196 break; // some kind of tight cycle |
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1197 } |
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1198 if (up == orig_sub && met_dom) { |
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1199 // returned back after visiting 'dom' |
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1200 break; // some kind of cycle |
163 | 1201 } |
1202 if (--iterations_without_region_limit < 0) { | |
193
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1203 break; // dead cycle |
163 | 1204 } |
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1205 sub = up; |
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1206 } |
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1207 |
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1208 // Did not meet Root or Start node in pred. chain. |
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1209 // Conservative answer for dead code. |
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1210 return false; |
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1211 } |
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1212 |
0 | 1213 //------------------------------remove_dead_region----------------------------- |
1214 // This control node is dead. Follow the subgraph below it making everything | |
1215 // using it dead as well. This will happen normally via the usual IterGVN | |
1216 // worklist but this call is more efficient. Do not update use-def info | |
1217 // inside the dead region, just at the borders. | |
305 | 1218 static void kill_dead_code( Node *dead, PhaseIterGVN *igvn ) { |
0 | 1219 // Con's are a popular node to re-hit in the hash table again. |
305 | 1220 if( dead->is_Con() ) return; |
0 | 1221 |
1222 // Can't put ResourceMark here since igvn->_worklist uses the same arena | |
1223 // for verify pass with +VerifyOpto and we add/remove elements in it here. | |
1224 Node_List nstack(Thread::current()->resource_area()); | |
1225 | |
1226 Node *top = igvn->C->top(); | |
1227 nstack.push(dead); | |
1228 | |
1229 while (nstack.size() > 0) { | |
1230 dead = nstack.pop(); | |
1231 if (dead->outcnt() > 0) { | |
1232 // Keep dead node on stack until all uses are processed. | |
1233 nstack.push(dead); | |
1234 // For all Users of the Dead... ;-) | |
1235 for (DUIterator_Last kmin, k = dead->last_outs(kmin); k >= kmin; ) { | |
1236 Node* use = dead->last_out(k); | |
1237 igvn->hash_delete(use); // Yank from hash table prior to mod | |
1238 if (use->in(0) == dead) { // Found another dead node | |
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1239 assert (!use->is_Con(), "Control for Con node should be Root node."); |
0 | 1240 use->set_req(0, top); // Cut dead edge to prevent processing |
1241 nstack.push(use); // the dead node again. | |
1242 } else { // Else found a not-dead user | |
1243 for (uint j = 1; j < use->req(); j++) { | |
1244 if (use->in(j) == dead) { // Turn all dead inputs into TOP | |
1245 use->set_req(j, top); | |
1246 } | |
1247 } | |
1248 igvn->_worklist.push(use); | |
1249 } | |
1250 // Refresh the iterator, since any number of kills might have happened. | |
1251 k = dead->last_outs(kmin); | |
1252 } | |
1253 } else { // (dead->outcnt() == 0) | |
1254 // Done with outputs. | |
1255 igvn->hash_delete(dead); | |
1256 igvn->_worklist.remove(dead); | |
1257 igvn->set_type(dead, Type::TOP); | |
1258 if (dead->is_macro()) { | |
1259 igvn->C->remove_macro_node(dead); | |
1260 } | |
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1261 if (dead->is_expensive()) { |
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1262 igvn->C->remove_expensive_node(dead); |
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1263 } |
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1264 igvn->C->record_dead_node(dead->_idx); |
0 | 1265 // Kill all inputs to the dead guy |
1266 for (uint i=0; i < dead->req(); i++) { | |
1267 Node *n = dead->in(i); // Get input to dead guy | |
1268 if (n != NULL && !n->is_top()) { // Input is valid? | |
1269 dead->set_req(i, top); // Smash input away | |
1270 if (n->outcnt() == 0) { // Input also goes dead? | |
1271 if (!n->is_Con()) | |
1272 nstack.push(n); // Clear it out as well | |
1273 } else if (n->outcnt() == 1 && | |
1274 n->has_special_unique_user()) { | |
1275 igvn->add_users_to_worklist( n ); | |
1276 } else if (n->outcnt() <= 2 && n->is_Store()) { | |
1277 // Push store's uses on worklist to enable folding optimization for | |
1278 // store/store and store/load to the same address. | |
1279 // The restriction (outcnt() <= 2) is the same as in set_req_X() | |
1280 // and remove_globally_dead_node(). | |
1281 igvn->add_users_to_worklist( n ); | |
1282 } | |
1283 } | |
1284 } | |
1285 } // (dead->outcnt() == 0) | |
1286 } // while (nstack.size() > 0) for outputs | |
305 | 1287 return; |
0 | 1288 } |
1289 | |
1290 //------------------------------remove_dead_region----------------------------- | |
1291 bool Node::remove_dead_region(PhaseGVN *phase, bool can_reshape) { | |
1292 Node *n = in(0); | |
1293 if( !n ) return false; | |
1294 // Lost control into this guy? I.e., it became unreachable? | |
1295 // Aggressively kill all unreachable code. | |
1296 if (can_reshape && n->is_top()) { | |
305 | 1297 kill_dead_code(this, phase->is_IterGVN()); |
1298 return false; // Node is dead. | |
0 | 1299 } |
1300 | |
1301 if( n->is_Region() && n->as_Region()->is_copy() ) { | |
1302 Node *m = n->nonnull_req(); | |
1303 set_req(0, m); | |
1304 return true; | |
1305 } | |
1306 return false; | |
1307 } | |
1308 | |
1309 //------------------------------Ideal_DU_postCCP------------------------------- | |
1310 // Idealize graph, using DU info. Must clone result into new-space | |
1311 Node *Node::Ideal_DU_postCCP( PhaseCCP * ) { | |
1312 return NULL; // Default to no change | |
1313 } | |
1314 | |
1315 //------------------------------hash------------------------------------------- | |
1316 // Hash function over Nodes. | |
1317 uint Node::hash() const { | |
1318 uint sum = 0; | |
1319 for( uint i=0; i<_cnt; i++ ) // Add in all inputs | |
1320 sum = (sum<<1)-(uintptr_t)in(i); // Ignore embedded NULLs | |
1321 return (sum>>2) + _cnt + Opcode(); | |
1322 } | |
1323 | |
1324 //------------------------------cmp-------------------------------------------- | |
1325 // Compare special parts of simple Nodes | |
1326 uint Node::cmp( const Node &n ) const { | |
1327 return 1; // Must be same | |
1328 } | |
1329 | |
1330 //------------------------------rematerialize----------------------------------- | |
1331 // Should we clone rather than spill this instruction? | |
1332 bool Node::rematerialize() const { | |
1333 if ( is_Mach() ) | |
1334 return this->as_Mach()->rematerialize(); | |
1335 else | |
1336 return (_flags & Flag_rematerialize) != 0; | |
1337 } | |
1338 | |
1339 //------------------------------needs_anti_dependence_check--------------------- | |
1340 // Nodes which use memory without consuming it, hence need antidependences. | |
1341 bool Node::needs_anti_dependence_check() const { | |
1342 if( req() < 2 || (_flags & Flag_needs_anti_dependence_check) == 0 ) | |
1343 return false; | |
1344 else | |
1345 return in(1)->bottom_type()->has_memory(); | |
1346 } | |
1347 | |
1348 | |
1349 // Get an integer constant from a ConNode (or CastIINode). | |
1350 // Return a default value if there is no apparent constant here. | |
1351 const TypeInt* Node::find_int_type() const { | |
1352 if (this->is_Type()) { | |
1353 return this->as_Type()->type()->isa_int(); | |
1354 } else if (this->is_Con()) { | |
1355 assert(is_Mach(), "should be ConNode(TypeNode) or else a MachNode"); | |
1356 return this->bottom_type()->isa_int(); | |
1357 } | |
1358 return NULL; | |
1359 } | |
1360 | |
1361 // Get a pointer constant from a ConstNode. | |
1362 // Returns the constant if it is a pointer ConstNode | |
1363 intptr_t Node::get_ptr() const { | |
1364 assert( Opcode() == Op_ConP, "" ); | |
1365 return ((ConPNode*)this)->type()->is_ptr()->get_con(); | |
1366 } | |
1367 | |
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1368 // Get a narrow oop constant from a ConNNode. |
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1369 intptr_t Node::get_narrowcon() const { |
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1370 assert( Opcode() == Op_ConN, "" ); |
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1371 return ((ConNNode*)this)->type()->is_narrowoop()->get_con(); |
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1372 } |
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1373 |
0 | 1374 // Get a long constant from a ConNode. |
1375 // Return a default value if there is no apparent constant here. | |
1376 const TypeLong* Node::find_long_type() const { | |
1377 if (this->is_Type()) { | |
1378 return this->as_Type()->type()->isa_long(); | |
1379 } else if (this->is_Con()) { | |
1380 assert(is_Mach(), "should be ConNode(TypeNode) or else a MachNode"); | |
1381 return this->bottom_type()->isa_long(); | |
1382 } | |
1383 return NULL; | |
1384 } | |
1385 | |
1386 // Get a double constant from a ConstNode. | |
1387 // Returns the constant if it is a double ConstNode | |
1388 jdouble Node::getd() const { | |
1389 assert( Opcode() == Op_ConD, "" ); | |
1390 return ((ConDNode*)this)->type()->is_double_constant()->getd(); | |
1391 } | |
1392 | |
1393 // Get a float constant from a ConstNode. | |
1394 // Returns the constant if it is a float ConstNode | |
1395 jfloat Node::getf() const { | |
1396 assert( Opcode() == Op_ConF, "" ); | |
1397 return ((ConFNode*)this)->type()->is_float_constant()->getf(); | |
1398 } | |
1399 | |
1400 #ifndef PRODUCT | |
1401 | |
1402 //----------------------------NotANode---------------------------------------- | |
1403 // Used in debugging code to avoid walking across dead or uninitialized edges. | |
1404 static inline bool NotANode(const Node* n) { | |
1405 if (n == NULL) return true; | |
1406 if (((intptr_t)n & 1) != 0) return true; // uninitialized, etc. | |
1407 if (*(address*)n == badAddress) return true; // kill by Node::destruct | |
1408 return false; | |
1409 } | |
1410 | |
1411 | |
1412 //------------------------------find------------------------------------------ | |
1413 // Find a neighbor of this Node with the given _idx | |
1414 // If idx is negative, find its absolute value, following both _in and _out. | |
2403 | 1415 static void find_recur(Compile* C, Node* &result, Node *n, int idx, bool only_ctrl, |
1416 VectorSet* old_space, VectorSet* new_space ) { | |
0 | 1417 int node_idx = (idx >= 0) ? idx : -idx; |
1418 if (NotANode(n)) return; // Gracefully handle NULL, -1, 0xabababab, etc. | |
2403 | 1419 // Contained in new_space or old_space? Check old_arena first since it's mostly empty. |
1420 VectorSet *v = C->old_arena()->contains(n) ? old_space : new_space; | |
0 | 1421 if( v->test(n->_idx) ) return; |
1422 if( (int)n->_idx == node_idx | |
1423 debug_only(|| n->debug_idx() == node_idx) ) { | |
1424 if (result != NULL) | |
1425 tty->print("find: " INTPTR_FORMAT " and " INTPTR_FORMAT " both have idx==%d\n", | |
1426 (uintptr_t)result, (uintptr_t)n, node_idx); | |
1427 result = n; | |
1428 } | |
1429 v->set(n->_idx); | |
1430 for( uint i=0; i<n->len(); i++ ) { | |
1431 if( only_ctrl && !(n->is_Region()) && (n->Opcode() != Op_Root) && (i != TypeFunc::Control) ) continue; | |
2403 | 1432 find_recur(C, result, n->in(i), idx, only_ctrl, old_space, new_space ); |
0 | 1433 } |
1434 // Search along forward edges also: | |
1435 if (idx < 0 && !only_ctrl) { | |
1436 for( uint j=0; j<n->outcnt(); j++ ) { | |
2403 | 1437 find_recur(C, result, n->raw_out(j), idx, only_ctrl, old_space, new_space ); |
0 | 1438 } |
1439 } | |
1440 #ifdef ASSERT | |
2403 | 1441 // Search along debug_orig edges last, checking for cycles |
1442 Node* orig = n->debug_orig(); | |
1443 if (orig != NULL) { | |
1444 do { | |
1445 if (NotANode(orig)) break; | |
1446 find_recur(C, result, orig, idx, only_ctrl, old_space, new_space ); | |
1447 orig = orig->debug_orig(); | |
1448 } while (orig != NULL && orig != n->debug_orig()); | |
0 | 1449 } |
1450 #endif //ASSERT | |
1451 } | |
1452 | |
1453 // call this from debugger: | |
1454 Node* find_node(Node* n, int idx) { | |
1455 return n->find(idx); | |
1456 } | |
1457 | |
1458 //------------------------------find------------------------------------------- | |
1459 Node* Node::find(int idx) const { | |
1460 ResourceArea *area = Thread::current()->resource_area(); | |
1461 VectorSet old_space(area), new_space(area); | |
1462 Node* result = NULL; | |
2403 | 1463 find_recur(Compile::current(), result, (Node*) this, idx, false, &old_space, &new_space ); |
0 | 1464 return result; |
1465 } | |
1466 | |
1467 //------------------------------find_ctrl-------------------------------------- | |
1468 // Find an ancestor to this node in the control history with given _idx | |
1469 Node* Node::find_ctrl(int idx) const { | |
1470 ResourceArea *area = Thread::current()->resource_area(); | |
1471 VectorSet old_space(area), new_space(area); | |
1472 Node* result = NULL; | |
2403 | 1473 find_recur(Compile::current(), result, (Node*) this, idx, true, &old_space, &new_space ); |
0 | 1474 return result; |
1475 } | |
1476 #endif | |
1477 | |
1478 | |
1479 | |
1480 #ifndef PRODUCT | |
1481 int Node::_in_dump_cnt = 0; | |
1482 | |
1483 // -----------------------------Name------------------------------------------- | |
1484 extern const char *NodeClassNames[]; | |
1485 const char *Node::Name() const { return NodeClassNames[Opcode()]; } | |
1486 | |
1487 static bool is_disconnected(const Node* n) { | |
1488 for (uint i = 0; i < n->req(); i++) { | |
1489 if (n->in(i) != NULL) return false; | |
1490 } | |
1491 return true; | |
1492 } | |
1493 | |
1494 #ifdef ASSERT | |
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1495 static void dump_orig(Node* orig, outputStream *st) { |
0 | 1496 Compile* C = Compile::current(); |
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1497 if (NotANode(orig)) orig = NULL; |
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1498 if (orig != NULL && !C->node_arena()->contains(orig)) orig = NULL; |
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1499 if (orig == NULL) return; |
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1500 st->print(" !orig="); |
0 | 1501 Node* fast = orig->debug_orig(); // tortoise & hare algorithm to detect loops |
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1502 if (NotANode(fast)) fast = NULL; |
0 | 1503 while (orig != NULL) { |
1504 bool discon = is_disconnected(orig); // if discon, print [123] else 123 | |
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1505 if (discon) st->print("["); |
0 | 1506 if (!Compile::current()->node_arena()->contains(orig)) |
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1507 st->print("o"); |
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1508 st->print("%d", orig->_idx); |
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1509 if (discon) st->print("]"); |
0 | 1510 orig = orig->debug_orig(); |
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1511 if (NotANode(orig)) orig = NULL; |
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1512 if (orig != NULL && !C->node_arena()->contains(orig)) orig = NULL; |
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1513 if (orig != NULL) st->print(","); |
0 | 1514 if (fast != NULL) { |
1515 // Step fast twice for each single step of orig: | |
1516 fast = fast->debug_orig(); | |
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1517 if (NotANode(fast)) fast = NULL; |
0 | 1518 if (fast != NULL && fast != orig) { |
1519 fast = fast->debug_orig(); | |
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1520 if (NotANode(fast)) fast = NULL; |
0 | 1521 } |
1522 if (fast == orig) { | |
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1523 st->print("..."); |
0 | 1524 break; |
1525 } | |
1526 } | |
1527 } | |
1528 } | |
1529 | |
1530 void Node::set_debug_orig(Node* orig) { | |
1531 _debug_orig = orig; | |
1532 if (BreakAtNode == 0) return; | |
1533 if (NotANode(orig)) orig = NULL; | |
1534 int trip = 10; | |
1535 while (orig != NULL) { | |
1536 if (orig->debug_idx() == BreakAtNode || (int)orig->_idx == BreakAtNode) { | |
1537 tty->print_cr("BreakAtNode: _idx=%d _debug_idx=%d orig._idx=%d orig._debug_idx=%d", | |
1538 this->_idx, this->debug_idx(), orig->_idx, orig->debug_idx()); | |
1539 BREAKPOINT; | |
1540 } | |
1541 orig = orig->debug_orig(); | |
1542 if (NotANode(orig)) orig = NULL; | |
1543 if (trip-- <= 0) break; | |
1544 } | |
1545 } | |
1546 #endif //ASSERT | |
1547 | |
1548 //------------------------------dump------------------------------------------ | |
1549 // Dump a Node | |
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1550 void Node::dump(const char* suffix, outputStream *st) const { |
0 | 1551 Compile* C = Compile::current(); |
1552 bool is_new = C->node_arena()->contains(this); | |
1553 _in_dump_cnt++; | |
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1554 st->print("%c%d\t%s\t=== ", is_new ? ' ' : 'o', _idx, Name()); |
0 | 1555 |
1556 // Dump the required and precedence inputs | |
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1557 dump_req(st); |
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1558 dump_prec(st); |
0 | 1559 // Dump the outputs |
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1560 dump_out(st); |
0 | 1561 |
1562 if (is_disconnected(this)) { | |
1563 #ifdef ASSERT | |
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1564 st->print(" [%d]",debug_idx()); |
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1565 dump_orig(debug_orig(), st); |
0 | 1566 #endif |
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1567 st->cr(); |
0 | 1568 _in_dump_cnt--; |
1569 return; // don't process dead nodes | |
1570 } | |
1571 | |
1572 // Dump node-specific info | |
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1573 dump_spec(st); |
0 | 1574 #ifdef ASSERT |
1575 // Dump the non-reset _debug_idx | |
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1576 if (Verbose && WizardMode) { |
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1577 st->print(" [%d]",debug_idx()); |
0 | 1578 } |
1579 #endif | |
1580 | |
1581 const Type *t = bottom_type(); | |
1582 | |
1583 if (t != NULL && (t->isa_instptr() || t->isa_klassptr())) { | |
1584 const TypeInstPtr *toop = t->isa_instptr(); | |
1585 const TypeKlassPtr *tkls = t->isa_klassptr(); | |
1586 ciKlass* klass = toop ? toop->klass() : (tkls ? tkls->klass() : NULL ); | |
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1587 if (klass && klass->is_loaded() && klass->is_interface()) { |
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1588 st->print(" Interface:"); |
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1589 } else if (toop) { |
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1590 st->print(" Oop:"); |
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1591 } else if (tkls) { |
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1592 st->print(" Klass:"); |
0 | 1593 } |
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1594 t->dump_on(st); |
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1595 } else if (t == Type::MEMORY) { |
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1596 st->print(" Memory:"); |
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1597 MemNode::dump_adr_type(this, adr_type(), st); |
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1598 } else if (Verbose || WizardMode) { |
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1599 st->print(" Type:"); |
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1600 if (t) { |
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1601 t->dump_on(st); |
0 | 1602 } else { |
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1603 st->print("no type"); |
0 | 1604 } |
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1605 } else if (t->isa_vect() && this->is_MachSpillCopy()) { |
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1606 // Dump MachSpillcopy vector type. |
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1607 t->dump_on(st); |
0 | 1608 } |
1609 if (is_new) { | |
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1610 debug_only(dump_orig(debug_orig(), st)); |
0 | 1611 Node_Notes* nn = C->node_notes_at(_idx); |
1612 if (nn != NULL && !nn->is_clear()) { | |
1613 if (nn->jvms() != NULL) { | |
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1614 st->print(" !jvms:"); |
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1615 nn->jvms()->dump_spec(st); |
0 | 1616 } |
1617 } | |
1618 } | |
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1619 if (suffix) st->print(suffix); |
0 | 1620 _in_dump_cnt--; |
1621 } | |
1622 | |
1623 //------------------------------dump_req-------------------------------------- | |
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1624 void Node::dump_req(outputStream *st) const { |
0 | 1625 // Dump the required input edges |
1626 for (uint i = 0; i < req(); i++) { // For all required inputs | |
1627 Node* d = in(i); | |
1628 if (d == NULL) { | |
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1629 st->print("_ "); |
0 | 1630 } else if (NotANode(d)) { |
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1631 st->print("NotANode "); // uninitialized, sentinel, garbage, etc. |
0 | 1632 } else { |
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1633 st->print("%c%d ", Compile::current()->node_arena()->contains(d) ? ' ' : 'o', d->_idx); |
0 | 1634 } |
1635 } | |
1636 } | |
1637 | |
1638 | |
1639 //------------------------------dump_prec------------------------------------- | |
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1640 void Node::dump_prec(outputStream *st) const { |
0 | 1641 // Dump the precedence edges |
1642 int any_prec = 0; | |
1643 for (uint i = req(); i < len(); i++) { // For all precedence inputs | |
1644 Node* p = in(i); | |
1645 if (p != NULL) { | |
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1646 if (!any_prec++) st->print(" |"); |
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1647 if (NotANode(p)) { st->print("NotANode "); continue; } |
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1648 st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx); |
0 | 1649 } |
1650 } | |
1651 } | |
1652 | |
1653 //------------------------------dump_out-------------------------------------- | |
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1654 void Node::dump_out(outputStream *st) const { |
0 | 1655 // Delimit the output edges |
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1656 st->print(" [["); |
0 | 1657 // Dump the output edges |
1658 for (uint i = 0; i < _outcnt; i++) { // For all outputs | |
1659 Node* u = _out[i]; | |
1660 if (u == NULL) { | |
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1661 st->print("_ "); |
0 | 1662 } else if (NotANode(u)) { |
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1663 st->print("NotANode "); |
0 | 1664 } else { |
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1665 st->print("%c%d ", Compile::current()->node_arena()->contains(u) ? ' ' : 'o', u->_idx); |
0 | 1666 } |
1667 } | |
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1668 st->print("]] "); |
0 | 1669 } |
1670 | |
1671 //------------------------------dump_nodes------------------------------------- | |
1672 static void dump_nodes(const Node* start, int d, bool only_ctrl) { | |
1673 Node* s = (Node*)start; // remove const | |
1674 if (NotANode(s)) return; | |
1675 | |
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1676 uint depth = (uint)ABS(d); |
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1677 int direction = d; |
0 | 1678 Compile* C = Compile::current(); |
40 | 1679 GrowableArray <Node *> nstack(C->unique()); |
0 | 1680 |
40 | 1681 nstack.append(s); |
1682 int begin = 0; | |
1683 int end = 0; | |
1684 for(uint i = 0; i < depth; i++) { | |
1685 end = nstack.length(); | |
1686 for(int j = begin; j < end; j++) { | |
1687 Node* tp = nstack.at(j); | |
1688 uint limit = direction > 0 ? tp->len() : tp->outcnt(); | |
1689 for(uint k = 0; k < limit; k++) { | |
1690 Node* n = direction > 0 ? tp->in(k) : tp->raw_out(k); | |
0 | 1691 |
40 | 1692 if (NotANode(n)) continue; |
1693 // do not recurse through top or the root (would reach unrelated stuff) | |
1694 if (n->is_Root() || n->is_top()) continue; | |
1695 if (only_ctrl && !n->is_CFG()) continue; | |
0 | 1696 |
40 | 1697 bool on_stack = nstack.contains(n); |
1698 if (!on_stack) { | |
1699 nstack.append(n); | |
0 | 1700 } |
1701 } | |
1702 } | |
40 | 1703 begin = end; |
1704 } | |
1705 end = nstack.length(); | |
1706 if (direction > 0) { | |
1707 for(int j = end-1; j >= 0; j--) { | |
1708 nstack.at(j)->dump(); | |
1709 } | |
1710 } else { | |
1711 for(int j = 0; j < end; j++) { | |
1712 nstack.at(j)->dump(); | |
1713 } | |
0 | 1714 } |
1715 } | |
1716 | |
1717 //------------------------------dump------------------------------------------- | |
1718 void Node::dump(int d) const { | |
1719 dump_nodes(this, d, false); | |
1720 } | |
1721 | |
1722 //------------------------------dump_ctrl-------------------------------------- | |
1723 // Dump a Node's control history to depth | |
1724 void Node::dump_ctrl(int d) const { | |
1725 dump_nodes(this, d, true); | |
1726 } | |
1727 | |
1728 // VERIFICATION CODE | |
1729 // For each input edge to a node (ie - for each Use-Def edge), verify that | |
1730 // there is a corresponding Def-Use edge. | |
1731 //------------------------------verify_edges----------------------------------- | |
1732 void Node::verify_edges(Unique_Node_List &visited) { | |
1733 uint i, j, idx; | |
1734 int cnt; | |
1735 Node *n; | |
1736 | |
1737 // Recursive termination test | |
1738 if (visited.member(this)) return; | |
1739 visited.push(this); | |
1740 | |
605 | 1741 // Walk over all input edges, checking for correspondence |
0 | 1742 for( i = 0; i < len(); i++ ) { |
1743 n = in(i); | |
1744 if (n != NULL && !n->is_top()) { | |
1745 // Count instances of (Node *)this | |
1746 cnt = 0; | |
1747 for (idx = 0; idx < n->_outcnt; idx++ ) { | |
1748 if (n->_out[idx] == (Node *)this) cnt++; | |
1749 } | |
1750 assert( cnt > 0,"Failed to find Def-Use edge." ); | |
1751 // Check for duplicate edges | |
1752 // walk the input array downcounting the input edges to n | |
1753 for( j = 0; j < len(); j++ ) { | |
1754 if( in(j) == n ) cnt--; | |
1755 } | |
1756 assert( cnt == 0,"Mismatched edge count."); | |
1757 } else if (n == NULL) { | |
1758 assert(i >= req() || i == 0 || is_Region() || is_Phi(), "only regions or phis have null data edges"); | |
1759 } else { | |
1760 assert(n->is_top(), "sanity"); | |
1761 // Nothing to check. | |
1762 } | |
1763 } | |
1764 // Recursive walk over all input edges | |
1765 for( i = 0; i < len(); i++ ) { | |
1766 n = in(i); | |
1767 if( n != NULL ) | |
1768 in(i)->verify_edges(visited); | |
1769 } | |
1770 } | |
1771 | |
1772 //------------------------------verify_recur----------------------------------- | |
1773 static const Node *unique_top = NULL; | |
1774 | |
1775 void Node::verify_recur(const Node *n, int verify_depth, | |
1776 VectorSet &old_space, VectorSet &new_space) { | |
1777 if ( verify_depth == 0 ) return; | |
1778 if (verify_depth > 0) --verify_depth; | |
1779 | |
1780 Compile* C = Compile::current(); | |
1781 | |
1782 // Contained in new_space or old_space? | |
1783 VectorSet *v = C->node_arena()->contains(n) ? &new_space : &old_space; | |
1784 // Check for visited in the proper space. Numberings are not unique | |
605 | 1785 // across spaces so we need a separate VectorSet for each space. |
0 | 1786 if( v->test_set(n->_idx) ) return; |
1787 | |
1788 if (n->is_Con() && n->bottom_type() == Type::TOP) { | |
1789 if (C->cached_top_node() == NULL) | |
1790 C->set_cached_top_node((Node*)n); | |
1791 assert(C->cached_top_node() == n, "TOP node must be unique"); | |
1792 } | |
1793 | |
1794 for( uint i = 0; i < n->len(); i++ ) { | |
1795 Node *x = n->in(i); | |
1796 if (!x || x->is_top()) continue; | |
1797 | |
1798 // Verify my input has a def-use edge to me | |
1799 if (true /*VerifyDefUse*/) { | |
1800 // Count use-def edges from n to x | |
1801 int cnt = 0; | |
1802 for( uint j = 0; j < n->len(); j++ ) | |
1803 if( n->in(j) == x ) | |
1804 cnt++; | |
1805 // Count def-use edges from x to n | |
1806 uint max = x->_outcnt; | |
1807 for( uint k = 0; k < max; k++ ) | |
1808 if (x->_out[k] == n) | |
1809 cnt--; | |
1810 assert( cnt == 0, "mismatched def-use edge counts" ); | |
1811 } | |
1812 | |
1813 verify_recur(x, verify_depth, old_space, new_space); | |
1814 } | |
1815 | |
1816 } | |
1817 | |
1818 //------------------------------verify----------------------------------------- | |
1819 // Check Def-Use info for my subgraph | |
1820 void Node::verify() const { | |
1821 Compile* C = Compile::current(); | |
1822 Node* old_top = C->cached_top_node(); | |
1823 ResourceMark rm; | |
1824 ResourceArea *area = Thread::current()->resource_area(); | |
1825 VectorSet old_space(area), new_space(area); | |
1826 verify_recur(this, -1, old_space, new_space); | |
1827 C->set_cached_top_node(old_top); | |
1828 } | |
1829 #endif | |
1830 | |
1831 | |
1832 //------------------------------walk------------------------------------------- | |
1833 // Graph walk, with both pre-order and post-order functions | |
1834 void Node::walk(NFunc pre, NFunc post, void *env) { | |
1835 VectorSet visited(Thread::current()->resource_area()); // Setup for local walk | |
1836 walk_(pre, post, env, visited); | |
1837 } | |
1838 | |
1839 void Node::walk_(NFunc pre, NFunc post, void *env, VectorSet &visited) { | |
1840 if( visited.test_set(_idx) ) return; | |
1841 pre(*this,env); // Call the pre-order walk function | |
1842 for( uint i=0; i<_max; i++ ) | |
1843 if( in(i) ) // Input exists and is not walked? | |
1844 in(i)->walk_(pre,post,env,visited); // Walk it with pre & post functions | |
1845 post(*this,env); // Call the post-order walk function | |
1846 } | |
1847 | |
1848 void Node::nop(Node &, void*) {} | |
1849 | |
1850 //------------------------------Registers-------------------------------------- | |
1851 // Do we Match on this edge index or not? Generally false for Control | |
1852 // and true for everything else. Weird for calls & returns. | |
1853 uint Node::match_edge(uint idx) const { | |
1854 return idx; // True for other than index 0 (control) | |
1855 } | |
1856 | |
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1857 static RegMask _not_used_at_all; |
0 | 1858 // Register classes are defined for specific machines |
1859 const RegMask &Node::out_RegMask() const { | |
1860 ShouldNotCallThis(); | |
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1861 return _not_used_at_all; |
0 | 1862 } |
1863 | |
1864 const RegMask &Node::in_RegMask(uint) const { | |
1865 ShouldNotCallThis(); | |
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1866 return _not_used_at_all; |
0 | 1867 } |
1868 | |
1869 //============================================================================= | |
1870 //----------------------------------------------------------------------------- | |
1871 void Node_Array::reset( Arena *new_arena ) { | |
1872 _a->Afree(_nodes,_max*sizeof(Node*)); | |
1873 _max = 0; | |
1874 _nodes = NULL; | |
1875 _a = new_arena; | |
1876 } | |
1877 | |
1878 //------------------------------clear------------------------------------------ | |
1879 // Clear all entries in _nodes to NULL but keep storage | |
1880 void Node_Array::clear() { | |
1881 Copy::zero_to_bytes( _nodes, _max*sizeof(Node*) ); | |
1882 } | |
1883 | |
1884 //----------------------------------------------------------------------------- | |
1885 void Node_Array::grow( uint i ) { | |
1886 if( !_max ) { | |
1887 _max = 1; | |
1888 _nodes = (Node**)_a->Amalloc( _max * sizeof(Node*) ); | |
1889 _nodes[0] = NULL; | |
1890 } | |
1891 uint old = _max; | |
1892 while( i >= _max ) _max <<= 1; // Double to fit | |
1893 _nodes = (Node**)_a->Arealloc( _nodes, old*sizeof(Node*),_max*sizeof(Node*)); | |
1894 Copy::zero_to_bytes( &_nodes[old], (_max-old)*sizeof(Node*) ); | |
1895 } | |
1896 | |
1897 //----------------------------------------------------------------------------- | |
1898 void Node_Array::insert( uint i, Node *n ) { | |
1899 if( _nodes[_max-1] ) grow(_max); // Get more space if full | |
1900 Copy::conjoint_words_to_higher((HeapWord*)&_nodes[i], (HeapWord*)&_nodes[i+1], ((_max-i-1)*sizeof(Node*))); | |
1901 _nodes[i] = n; | |
1902 } | |
1903 | |
1904 //----------------------------------------------------------------------------- | |
1905 void Node_Array::remove( uint i ) { | |
1906 Copy::conjoint_words_to_lower((HeapWord*)&_nodes[i+1], (HeapWord*)&_nodes[i], ((_max-i-1)*sizeof(Node*))); | |
1907 _nodes[_max-1] = NULL; | |
1908 } | |
1909 | |
1910 //----------------------------------------------------------------------------- | |
1911 void Node_Array::sort( C_sort_func_t func) { | |
1912 qsort( _nodes, _max, sizeof( Node* ), func ); | |
1913 } | |
1914 | |
1915 //----------------------------------------------------------------------------- | |
1916 void Node_Array::dump() const { | |
1917 #ifndef PRODUCT | |
1918 for( uint i = 0; i < _max; i++ ) { | |
1919 Node *nn = _nodes[i]; | |
1920 if( nn != NULL ) { | |
1921 tty->print("%5d--> ",i); nn->dump(); | |
1922 } | |
1923 } | |
1924 #endif | |
1925 } | |
1926 | |
1927 //--------------------------is_iteratively_computed------------------------------ | |
1928 // Operation appears to be iteratively computed (such as an induction variable) | |
1929 // It is possible for this operation to return false for a loop-varying | |
1930 // value, if it appears (by local graph inspection) to be computed by a simple conditional. | |
1931 bool Node::is_iteratively_computed() { | |
1932 if (ideal_reg()) { // does operation have a result register? | |
1933 for (uint i = 1; i < req(); i++) { | |
1934 Node* n = in(i); | |
1935 if (n != NULL && n->is_Phi()) { | |
1936 for (uint j = 1; j < n->req(); j++) { | |
1937 if (n->in(j) == this) { | |
1938 return true; | |
1939 } | |
1940 } | |
1941 } | |
1942 } | |
1943 } | |
1944 return false; | |
1945 } | |
1946 | |
1947 //--------------------------find_similar------------------------------ | |
1948 // Return a node with opcode "opc" and same inputs as "this" if one can | |
1949 // be found; Otherwise return NULL; | |
1950 Node* Node::find_similar(int opc) { | |
1951 if (req() >= 2) { | |
1952 Node* def = in(1); | |
1953 if (def && def->outcnt() >= 2) { | |
1954 for (DUIterator_Fast dmax, i = def->fast_outs(dmax); i < dmax; i++) { | |
1955 Node* use = def->fast_out(i); | |
1956 if (use->Opcode() == opc && | |
1957 use->req() == req()) { | |
1958 uint j; | |
1959 for (j = 0; j < use->req(); j++) { | |
1960 if (use->in(j) != in(j)) { | |
1961 break; | |
1962 } | |
1963 } | |
1964 if (j == use->req()) { | |
1965 return use; | |
1966 } | |
1967 } | |
1968 } | |
1969 } | |
1970 } | |
1971 return NULL; | |
1972 } | |
1973 | |
1974 | |
1975 //--------------------------unique_ctrl_out------------------------------ | |
1976 // Return the unique control out if only one. Null if none or more than one. | |
1977 Node* Node::unique_ctrl_out() { | |
1978 Node* found = NULL; | |
1979 for (uint i = 0; i < outcnt(); i++) { | |
1980 Node* use = raw_out(i); | |
1981 if (use->is_CFG() && use != this) { | |
1982 if (found != NULL) return NULL; | |
1983 found = use; | |
1984 } | |
1985 } | |
1986 return found; | |
1987 } | |
1988 | |
1989 //============================================================================= | |
1990 //------------------------------yank------------------------------------------- | |
1991 // Find and remove | |
1992 void Node_List::yank( Node *n ) { | |
1993 uint i; | |
1994 for( i = 0; i < _cnt; i++ ) | |
1995 if( _nodes[i] == n ) | |
1996 break; | |
1997 | |
1998 if( i < _cnt ) | |
1999 _nodes[i] = _nodes[--_cnt]; | |
2000 } | |
2001 | |
2002 //------------------------------dump------------------------------------------- | |
2003 void Node_List::dump() const { | |
2004 #ifndef PRODUCT | |
2005 for( uint i = 0; i < _cnt; i++ ) | |
2006 if( _nodes[i] ) { | |
2007 tty->print("%5d--> ",i); | |
2008 _nodes[i]->dump(); | |
2009 } | |
2010 #endif | |
2011 } | |
2012 | |
2013 //============================================================================= | |
2014 //------------------------------remove----------------------------------------- | |
2015 void Unique_Node_List::remove( Node *n ) { | |
2016 if( _in_worklist[n->_idx] ) { | |
2017 for( uint i = 0; i < size(); i++ ) | |
2018 if( _nodes[i] == n ) { | |
2019 map(i,Node_List::pop()); | |
2020 _in_worklist >>= n->_idx; | |
2021 return; | |
2022 } | |
2023 ShouldNotReachHere(); | |
2024 } | |
2025 } | |
2026 | |
2027 //-----------------------remove_useless_nodes---------------------------------- | |
2028 // Remove useless nodes from worklist | |
2029 void Unique_Node_List::remove_useless_nodes(VectorSet &useful) { | |
2030 | |
2031 for( uint i = 0; i < size(); ++i ) { | |
2032 Node *n = at(i); | |
2033 assert( n != NULL, "Did not expect null entries in worklist"); | |
2034 if( ! useful.test(n->_idx) ) { | |
2035 _in_worklist >>= n->_idx; | |
2036 map(i,Node_List::pop()); | |
2037 // Node *replacement = Node_List::pop(); | |
2038 // if( i != size() ) { // Check if removing last entry | |
2039 // _nodes[i] = replacement; | |
2040 // } | |
2041 --i; // Visit popped node | |
2042 // If it was last entry, loop terminates since size() was also reduced | |
2043 } | |
2044 } | |
2045 } | |
2046 | |
2047 //============================================================================= | |
2048 void Node_Stack::grow() { | |
2049 size_t old_top = pointer_delta(_inode_top,_inodes,sizeof(INode)); // save _top | |
2050 size_t old_max = pointer_delta(_inode_max,_inodes,sizeof(INode)); | |
2051 size_t max = old_max << 1; // max * 2 | |
2052 _inodes = REALLOC_ARENA_ARRAY(_a, INode, _inodes, old_max, max); | |
2053 _inode_max = _inodes + max; | |
2054 _inode_top = _inodes + old_top; // restore _top | |
2055 } | |
2056 | |
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2057 // Node_Stack is used to map nodes. |
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2058 Node* Node_Stack::find(uint idx) const { |
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2059 uint sz = size(); |
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2060 for (uint i=0; i < sz; i++) { |
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2061 if (idx == index_at(i) ) |
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2062 return node_at(i); |
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2063 } |
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2064 return NULL; |
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2065 } |
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2066 |
0 | 2067 //============================================================================= |
2068 uint TypeNode::size_of() const { return sizeof(*this); } | |
2069 #ifndef PRODUCT | |
2070 void TypeNode::dump_spec(outputStream *st) const { | |
2071 if( !Verbose && !WizardMode ) { | |
2072 // standard dump does this in Verbose and WizardMode | |
2073 st->print(" #"); _type->dump_on(st); | |
2074 } | |
2075 } | |
2076 #endif | |
2077 uint TypeNode::hash() const { | |
2078 return Node::hash() + _type->hash(); | |
2079 } | |
2080 uint TypeNode::cmp( const Node &n ) const | |
2081 { return !Type::cmp( _type, ((TypeNode&)n)._type ); } | |
2082 const Type *TypeNode::bottom_type() const { return _type; } | |
2083 const Type *TypeNode::Value( PhaseTransform * ) const { return _type; } | |
2084 | |
2085 //------------------------------ideal_reg-------------------------------------- | |
2086 uint TypeNode::ideal_reg() const { | |
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2087 return _type->ideal_reg(); |
0 | 2088 } |