1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2024, 2025, Alibaba Group Holding Limited. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
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24 */
25
26 #ifndef SHARE_OPTO_NODE_HPP
27 #define SHARE_OPTO_NODE_HPP
28
29 #include "libadt/vectset.hpp"
30 #include "opto/compile.hpp"
31 #include "opto/type.hpp"
32 #include "utilities/copy.hpp"
33
34 // Portions of code courtesy of Clifford Click
35
36 // Optimization - Graph Style
37
38
39 class AbstractLockNode;
40 class AddNode;
41 class AddPNode;
42 class AliasInfo;
43 class AllocateArrayNode;
44 class AllocateNode;
45 class ArrayCopyNode;
46 class BaseCountedLoopNode;
47 class BaseCountedLoopEndNode;
48 class BlackholeNode;
49 class Block;
50 class BoolNode;
51 class BoxLockNode;
52 class CMoveNode;
53 class CallDynamicJavaNode;
54 class CallJavaNode;
55 class CallLeafNode;
56 class CallLeafNoFPNode;
57 class CallNode;
58 class CallRuntimeNode;
59 class CallStaticJavaNode;
60 class CastFFNode;
61 class CastHHNode;
62 class CastDDNode;
63 class CastVVNode;
64 class CastIINode;
65 class CastLLNode;
66 class CastPPNode;
67 class CatchNode;
68 class CatchProjNode;
69 class CheckCastPPNode;
70 class ClearArrayNode;
71 class CmpNode;
72 class CodeBuffer;
73 class ConstraintCastNode;
74 class ConNode;
75 class ConINode;
76 class ConvertNode;
77 class CompareAndSwapNode;
78 class CompareAndExchangeNode;
79 class CountedLoopNode;
80 class CountedLoopEndNode;
81 class DecodeNarrowPtrNode;
82 class DecodeNNode;
83 class DecodeNKlassNode;
84 class EncodeNarrowPtrNode;
85 class EncodePNode;
86 class EncodePKlassNode;
87 class FastLockNode;
88 class FastUnlockNode;
89 class HaltNode;
90 class IfNode;
91 class IfProjNode;
92 class IfFalseNode;
93 class IfTrueNode;
94 class InitializeNode;
95 class JVMState;
96 class JumpNode;
97 class JumpProjNode;
98 class LoadNode;
99 class LoadStoreNode;
100 class LoadStoreConditionalNode;
101 class LockNode;
102 class LongCountedLoopNode;
103 class LongCountedLoopEndNode;
104 class LoopNode;
105 class LShiftNode;
106 class MachBranchNode;
107 class MachCallDynamicJavaNode;
108 class MachCallJavaNode;
109 class MachCallLeafNode;
110 class MachCallNode;
111 class MachCallRuntimeNode;
112 class MachCallStaticJavaNode;
113 class MachConstantBaseNode;
114 class MachConstantNode;
115 class MachGotoNode;
116 class MachIfNode;
117 class MachJumpNode;
118 class MachNode;
119 class MachNullCheckNode;
120 class MachProjNode;
121 class MachReturnNode;
122 class MachSafePointNode;
123 class MachSpillCopyNode;
124 class MachTempNode;
125 class MachMergeNode;
126 class MachMemBarNode;
127 class Matcher;
128 class MemBarNode;
129 class MemBarStoreStoreNode;
130 class MemNode;
131 class MergeMemNode;
132 class MoveNode;
133 class MulNode;
134 class MultiNode;
135 class MultiBranchNode;
136 class NegNode;
137 class NegVNode;
138 class NeverBranchNode;
139 class Opaque1Node;
140 class OpaqueLoopInitNode;
141 class OpaqueLoopStrideNode;
142 class OpaqueMultiversioningNode;
143 class OpaqueNotNullNode;
144 class OpaqueInitializedAssertionPredicateNode;
145 class OpaqueTemplateAssertionPredicateNode;
146 class OuterStripMinedLoopNode;
147 class OuterStripMinedLoopEndNode;
148 class Node;
149 class Node_Array;
150 class Node_List;
151 class Node_Stack;
152 class OopMap;
153 class ParmNode;
154 class ParsePredicateNode;
155 class PCTableNode;
156 class PhaseCCP;
157 class PhaseGVN;
158 class PhaseIdealLoop;
159 class PhaseIterGVN;
160 class PhaseRegAlloc;
161 class PhaseTransform;
162 class PhaseValues;
163 class PhiNode;
164 class Pipeline;
165 class PopulateIndexNode;
166 class ProjNode;
167 class RangeCheckNode;
168 class ReductionNode;
169 class RegMask;
170 class RegionNode;
171 class RootNode;
172 class SafePointNode;
173 class SafePointScalarObjectNode;
174 class SafePointScalarMergeNode;
175 class SaturatingVectorNode;
176 class StartNode;
177 class State;
178 class StoreNode;
179 class SubNode;
180 class SubTypeCheckNode;
181 class Type;
182 class TypeNode;
183 class UnlockNode;
184 class VectorNode;
185 class LoadVectorNode;
186 class LoadVectorMaskedNode;
187 class StoreVectorMaskedNode;
188 class LoadVectorGatherNode;
189 class LoadVectorGatherMaskedNode;
190 class StoreVectorNode;
191 class StoreVectorScatterNode;
192 class StoreVectorScatterMaskedNode;
193 class VerifyVectorAlignmentNode;
194 class VectorMaskCmpNode;
195 class VectorUnboxNode;
196 class VectorSet;
197 class VectorReinterpretNode;
198 class ShiftVNode;
199 class MulVLNode;
200 class ExpandVNode;
201 class CompressVNode;
202 class CompressMNode;
203 class C2_MacroAssembler;
204
205
206 #ifndef OPTO_DU_ITERATOR_ASSERT
207 #ifdef ASSERT
208 #define OPTO_DU_ITERATOR_ASSERT 1
209 #else
210 #define OPTO_DU_ITERATOR_ASSERT 0
211 #endif
212 #endif //OPTO_DU_ITERATOR_ASSERT
213
214 #if OPTO_DU_ITERATOR_ASSERT
215 class DUIterator;
216 class DUIterator_Fast;
217 class DUIterator_Last;
218 #else
219 typedef uint DUIterator;
220 typedef Node** DUIterator_Fast;
221 typedef Node** DUIterator_Last;
222 #endif
223
224 typedef ResizeableResourceHashtable<Node*, Node*, AnyObj::RESOURCE_AREA, mtCompiler> OrigToNewHashtable;
225
226 // Node Sentinel
227 #define NodeSentinel (Node*)-1
228
229 // Unknown count frequency
230 #define COUNT_UNKNOWN (-1.0f)
231
232 //------------------------------Node-------------------------------------------
233 // Nodes define actions in the program. They create values, which have types.
234 // They are both vertices in a directed graph and program primitives. Nodes
235 // are labeled; the label is the "opcode", the primitive function in the lambda
236 // calculus sense that gives meaning to the Node. Node inputs are ordered (so
237 // that "a-b" is different from "b-a"). The inputs to a Node are the inputs to
238 // the Node's function. These inputs also define a Type equation for the Node.
239 // Solving these Type equations amounts to doing dataflow analysis.
240 // Control and data are uniformly represented in the graph. Finally, Nodes
241 // have a unique dense integer index which is used to index into side arrays
242 // whenever I have phase-specific information.
243
244 class Node {
245
246 // Lots of restrictions on cloning Nodes
247 NONCOPYABLE(Node);
248
249 public:
250 friend class Compile;
251 #if OPTO_DU_ITERATOR_ASSERT
252 friend class DUIterator_Common;
253 friend class DUIterator;
254 friend class DUIterator_Fast;
255 friend class DUIterator_Last;
256 #endif
257
258 // Because Nodes come and go, I define an Arena of Node structures to pull
259 // from. This should allow fast access to node creation & deletion. This
260 // field is a local cache of a value defined in some "program fragment" for
261 // which these Nodes are just a part of.
262
263 inline void* operator new(size_t x) throw() {
264 Compile* C = Compile::current();
265 Node* n = (Node*)C->node_arena()->AmallocWords(x);
266 return (void*)n;
267 }
268
269 // Delete is a NOP
270 void operator delete( void *ptr ) {}
271 // Fancy destructor; eagerly attempt to reclaim Node numberings and storage
272 void destruct(PhaseValues* phase);
273
274 // Create a new Node. Required is the number is of inputs required for
275 // semantic correctness.
276 Node( uint required );
277
278 // Create a new Node with given input edges.
279 // This version requires use of the "edge-count" new.
280 // E.g. new (C,3) FooNode( C, nullptr, left, right );
281 Node( Node *n0 );
282 Node( Node *n0, Node *n1 );
283 Node( Node *n0, Node *n1, Node *n2 );
284 Node( Node *n0, Node *n1, Node *n2, Node *n3 );
285 Node( Node *n0, Node *n1, Node *n2, Node *n3, Node *n4 );
286 Node( Node *n0, Node *n1, Node *n2, Node *n3, Node *n4, Node *n5 );
287 Node( Node *n0, Node *n1, Node *n2, Node *n3,
288 Node *n4, Node *n5, Node *n6 );
289
290 // Clone an inherited Node given only the base Node type.
291 Node* clone() const;
292
293 // Clone a Node, immediately supplying one or two new edges.
294 // The first and second arguments, if non-null, replace in(1) and in(2),
295 // respectively.
296 Node* clone_with_data_edge(Node* in1, Node* in2 = nullptr) const {
297 Node* nn = clone();
298 if (in1 != nullptr) nn->set_req(1, in1);
299 if (in2 != nullptr) nn->set_req(2, in2);
300 return nn;
301 }
302
303 private:
304 // Shared setup for the above constructors.
305 // Handles all interactions with Compile::current.
306 // Puts initial values in all Node fields except _idx.
307 // Returns the initial value for _idx, which cannot
308 // be initialized by assignment.
309 inline int Init(int req);
310
311 //----------------- input edge handling
312 protected:
313 friend class PhaseCFG; // Access to address of _in array elements
314 Node **_in; // Array of use-def references to Nodes
315 Node **_out; // Array of def-use references to Nodes
316
317 // Input edges are split into two categories. Required edges are required
318 // for semantic correctness; order is important and nulls are allowed.
319 // Precedence edges are used to help determine execution order and are
320 // added, e.g., for scheduling purposes. They are unordered and not
321 // duplicated; they have no embedded nulls. Edges from 0 to _cnt-1
322 // are required, from _cnt to _max-1 are precedence edges.
323 node_idx_t _cnt; // Total number of required Node inputs.
324
325 node_idx_t _max; // Actual length of input array.
326
327 // Output edges are an unordered list of def-use edges which exactly
328 // correspond to required input edges which point from other nodes
329 // to this one. Thus the count of the output edges is the number of
330 // users of this node.
331 node_idx_t _outcnt; // Total number of Node outputs.
332
333 node_idx_t _outmax; // Actual length of output array.
334
335 // Grow the actual input array to the next larger power-of-2 bigger than len.
336 void grow( uint len );
337 // Grow the output array to the next larger power-of-2 bigger than len.
338 void out_grow( uint len );
339 // Resize input or output array to grow it to the next larger power-of-2
340 // bigger than len.
341 void resize_array(Node**& array, node_idx_t& max_size, uint len, bool needs_clearing);
342
343 public:
344 // Each Node is assigned a unique small/dense number. This number is used
345 // to index into auxiliary arrays of data and bit vectors.
346 // The value of _idx can be changed using the set_idx() method.
347 //
348 // The PhaseRenumberLive phase renumbers nodes based on liveness information.
349 // Therefore, it updates the value of the _idx field. The parse-time _idx is
350 // preserved in _parse_idx.
351 node_idx_t _idx;
352 DEBUG_ONLY(const node_idx_t _parse_idx;)
353 // IGV node identifier. Two nodes, possibly in different compilation phases,
354 // have the same IGV identifier if (and only if) they are the very same node
355 // (same memory address) or one is "derived" from the other (by e.g.
356 // renumbering or matching). This identifier makes it possible to follow the
357 // entire lifetime of a node in IGV even if its C2 identifier (_idx) changes.
358 NOT_PRODUCT(node_idx_t _igv_idx;)
359
360 // Get the (read-only) number of input edges
361 uint req() const { return _cnt; }
362 uint len() const { return _max; }
363 // Get the (read-only) number of output edges
364 uint outcnt() const { return _outcnt; }
365
366 #if OPTO_DU_ITERATOR_ASSERT
367 // Iterate over the out-edges of this node. Deletions are illegal.
368 inline DUIterator outs() const;
369 // Use this when the out array might have changed to suppress asserts.
370 inline DUIterator& refresh_out_pos(DUIterator& i) const;
371 // Does the node have an out at this position? (Used for iteration.)
372 inline bool has_out(DUIterator& i) const;
373 inline Node* out(DUIterator& i) const;
374 // Iterate over the out-edges of this node. All changes are illegal.
375 inline DUIterator_Fast fast_outs(DUIterator_Fast& max) const;
376 inline Node* fast_out(DUIterator_Fast& i) const;
377 // Iterate over the out-edges of this node, deleting one at a time.
378 inline DUIterator_Last last_outs(DUIterator_Last& min) const;
379 inline Node* last_out(DUIterator_Last& i) const;
380 // The inline bodies of all these methods are after the iterator definitions.
381 #else
382 // Iterate over the out-edges of this node. Deletions are illegal.
383 // This iteration uses integral indexes, to decouple from array reallocations.
384 DUIterator outs() const { return 0; }
385 // Use this when the out array might have changed to suppress asserts.
386 DUIterator refresh_out_pos(DUIterator i) const { return i; }
387
388 // Reference to the i'th output Node. Error if out of bounds.
389 Node* out(DUIterator i) const { assert(i < _outcnt, "oob"); return _out[i]; }
390 // Does the node have an out at this position? (Used for iteration.)
391 bool has_out(DUIterator i) const { return i < _outcnt; }
392
393 // Iterate over the out-edges of this node. All changes are illegal.
394 // This iteration uses a pointer internal to the out array.
395 DUIterator_Fast fast_outs(DUIterator_Fast& max) const {
396 Node** out = _out;
397 // Assign a limit pointer to the reference argument:
398 max = out + (ptrdiff_t)_outcnt;
399 // Return the base pointer:
400 return out;
401 }
402 Node* fast_out(DUIterator_Fast i) const { return *i; }
403 // Iterate over the out-edges of this node, deleting one at a time.
404 // This iteration uses a pointer internal to the out array.
405 DUIterator_Last last_outs(DUIterator_Last& min) const {
406 Node** out = _out;
407 // Assign a limit pointer to the reference argument:
408 min = out;
409 // Return the pointer to the start of the iteration:
410 return out + (ptrdiff_t)_outcnt - 1;
411 }
412 Node* last_out(DUIterator_Last i) const { return *i; }
413 #endif
414
415 // Reference to the i'th input Node. Error if out of bounds.
416 Node* in(uint i) const { assert(i < _max, "oob: i=%d, _max=%d", i, _max); return _in[i]; }
417 // Reference to the i'th input Node. null if out of bounds.
418 Node* lookup(uint i) const { return ((i < _max) ? _in[i] : nullptr); }
419 // Reference to the i'th output Node. Error if out of bounds.
420 // Use this accessor sparingly. We are going trying to use iterators instead.
421 Node* raw_out(uint i) const { assert(i < _outcnt,"oob"); return _out[i]; }
422 // Return the unique out edge.
423 Node* unique_out() const { assert(_outcnt==1,"not unique"); return _out[0]; }
424 // Delete out edge at position 'i' by moving last out edge to position 'i'
425 void raw_del_out(uint i) {
426 assert(i < _outcnt,"oob");
427 assert(_outcnt > 0,"oob");
428 #if OPTO_DU_ITERATOR_ASSERT
429 // Record that a change happened here.
430 DEBUG_ONLY(_last_del = _out[i]; ++_del_tick);
431 #endif
432 _out[i] = _out[--_outcnt];
433 // Smash the old edge so it can't be used accidentally.
434 DEBUG_ONLY(_out[_outcnt] = (Node *)(uintptr_t)0xdeadbeef);
435 }
436
437 #ifdef ASSERT
438 bool is_dead() const;
439 static bool is_not_dead(const Node* n);
440 bool is_reachable_from_root() const;
441 #endif
442 // Check whether node has become unreachable
443 bool is_unreachable(PhaseIterGVN &igvn) const;
444
445 // Set a required input edge, also updates corresponding output edge
446 void add_req( Node *n ); // Append a NEW required input
447 void add_req( Node *n0, Node *n1 ) {
448 add_req(n0); add_req(n1); }
449 void add_req( Node *n0, Node *n1, Node *n2 ) {
450 add_req(n0); add_req(n1); add_req(n2); }
451 void add_req_batch( Node* n, uint m ); // Append m NEW required inputs (all n).
452 void del_req( uint idx ); // Delete required edge & compact
453 void del_req_ordered( uint idx ); // Delete required edge & compact with preserved order
454 void ins_req( uint i, Node *n ); // Insert a NEW required input
455 void set_req( uint i, Node *n ) {
456 assert( is_not_dead(n), "can not use dead node");
457 assert( i < _cnt, "oob: i=%d, _cnt=%d", i, _cnt);
458 assert( !VerifyHashTableKeys || _hash_lock == 0,
459 "remove node from hash table before modifying it");
460 Node** p = &_in[i]; // cache this._in, across the del_out call
461 if (*p != nullptr) (*p)->del_out((Node *)this);
462 (*p) = n;
463 if (n != nullptr) n->add_out((Node *)this);
464 Compile::current()->record_modified_node(this);
465 }
466 // Light version of set_req() to init inputs after node creation.
467 void init_req( uint i, Node *n ) {
468 assert( (i == 0 && this == n) ||
469 is_not_dead(n), "can not use dead node");
470 assert( i < _cnt, "oob");
471 assert( !VerifyHashTableKeys || _hash_lock == 0,
472 "remove node from hash table before modifying it");
473 assert( _in[i] == nullptr, "sanity");
474 _in[i] = n;
475 if (n != nullptr) n->add_out((Node *)this);
476 Compile::current()->record_modified_node(this);
477 }
478 // Find first occurrence of n among my edges:
479 int find_edge(Node* n);
480 int find_prec_edge(Node* n) {
481 for (uint i = req(); i < len(); i++) {
482 if (_in[i] == n) return i;
483 if (_in[i] == nullptr) {
484 DEBUG_ONLY( while ((++i) < len()) assert(_in[i] == nullptr, "Gap in prec edges!"); )
485 break;
486 }
487 }
488 return -1;
489 }
490 int replace_edge(Node* old, Node* neww, PhaseGVN* gvn = nullptr);
491 int replace_edges_in_range(Node* old, Node* neww, int start, int end, PhaseGVN* gvn);
492 // null out all inputs to eliminate incoming Def-Use edges.
493 void disconnect_inputs(Compile* C);
494
495 // Quickly, return true if and only if I am Compile::current()->top().
496 bool is_top() const {
497 assert((this == (Node*) Compile::current()->top()) == (_out == nullptr), "");
498 return (_out == nullptr);
499 }
500 // Reaffirm invariants for is_top. (Only from Compile::set_cached_top_node.)
501 void setup_is_top();
502
503 // Strip away casting. (It is depth-limited.)
504 Node* uncast(bool keep_deps = false) const;
505 // Return whether two Nodes are equivalent, after stripping casting.
506 bool eqv_uncast(const Node* n, bool keep_deps = false) const {
507 return (this->uncast(keep_deps) == n->uncast(keep_deps));
508 }
509
510 // Find out of current node that matches opcode.
511 Node* find_out_with(int opcode);
512 // Return true if the current node has an out that matches opcode.
513 bool has_out_with(int opcode);
514 // Return true if the current node has an out that matches any of the opcodes.
515 bool has_out_with(int opcode1, int opcode2, int opcode3, int opcode4);
516
517 private:
518 static Node* uncast_helper(const Node* n, bool keep_deps);
519
520 // Add an output edge to the end of the list
521 void add_out( Node *n ) {
522 if (is_top()) return;
523 if( _outcnt == _outmax ) out_grow(_outcnt);
524 _out[_outcnt++] = n;
525 }
526 // Delete an output edge
527 void del_out( Node *n ) {
528 if (is_top()) return;
529 Node** outp = &_out[_outcnt];
530 // Find and remove n
531 do {
532 assert(outp > _out, "Missing Def-Use edge");
533 } while (*--outp != n);
534 *outp = _out[--_outcnt];
535 // Smash the old edge so it can't be used accidentally.
536 DEBUG_ONLY(_out[_outcnt] = (Node *)(uintptr_t)0xdeadbeef);
537 // Record that a change happened here.
538 #if OPTO_DU_ITERATOR_ASSERT
539 DEBUG_ONLY(_last_del = n; ++_del_tick);
540 #endif
541 }
542 // Close gap after removing edge.
543 void close_prec_gap_at(uint gap) {
544 assert(_cnt <= gap && gap < _max, "no valid prec edge");
545 uint i = gap;
546 Node *last = nullptr;
547 for (; i < _max-1; ++i) {
548 Node *next = _in[i+1];
549 if (next == nullptr) break;
550 last = next;
551 }
552 _in[gap] = last; // Move last slot to empty one.
553 _in[i] = nullptr; // null out last slot.
554 }
555
556 public:
557 // Globally replace this node by a given new node, updating all uses.
558 void replace_by(Node* new_node);
559 // Globally replace this node by a given new node, updating all uses
560 // and cutting input edges of old node.
561 void subsume_by(Node* new_node, Compile* c) {
562 replace_by(new_node);
563 disconnect_inputs(c);
564 }
565 void set_req_X(uint i, Node *n, PhaseIterGVN *igvn);
566 void set_req_X(uint i, Node *n, PhaseGVN *gvn);
567 // Find the one non-null required input. RegionNode only
568 Node *nonnull_req() const;
569 // Add or remove precedence edges
570 void add_prec( Node *n );
571 void rm_prec( uint i );
572
573 // Note: prec(i) will not necessarily point to n if edge already exists.
574 void set_prec( uint i, Node *n ) {
575 assert(i < _max, "oob: i=%d, _max=%d", i, _max);
576 assert(is_not_dead(n), "can not use dead node");
577 assert(i >= _cnt, "not a precedence edge");
578 // Avoid spec violation: duplicated prec edge.
579 if (_in[i] == n) return;
580 if (n == nullptr || find_prec_edge(n) != -1) {
581 rm_prec(i);
582 return;
583 }
584 if (_in[i] != nullptr) _in[i]->del_out((Node *)this);
585 _in[i] = n;
586 n->add_out((Node *)this);
587 Compile::current()->record_modified_node(this);
588 }
589
590 // Set this node's index, used by cisc_version to replace current node
591 void set_idx(uint new_idx) {
592 _idx = new_idx;
593 }
594 // Swap input edge order. (Edge indexes i1 and i2 are usually 1 and 2.)
595 void swap_edges(uint i1, uint i2) {
596 DEBUG_ONLY(uint check_hash = (VerifyHashTableKeys && _hash_lock) ? hash() : NO_HASH);
597 // Def-Use info is unchanged
598 Node* n1 = in(i1);
599 Node* n2 = in(i2);
600 _in[i1] = n2;
601 _in[i2] = n1;
602 // If this node is in the hash table, make sure it doesn't need a rehash.
603 assert(check_hash == NO_HASH || check_hash == hash(), "edge swap must preserve hash code");
604 // Flip swapped edges flag.
605 if (has_swapped_edges()) {
606 remove_flag(Node::Flag_has_swapped_edges);
607 } else {
608 add_flag(Node::Flag_has_swapped_edges);
609 }
610 }
611
612 // Iterators over input Nodes for a Node X are written as:
613 // for( i = 0; i < X.req(); i++ ) ... X[i] ...
614 // NOTE: Required edges can contain embedded null pointers.
615
616 //----------------- Other Node Properties
617
618 // Generate class IDs for (some) ideal nodes so that it is possible to determine
619 // the type of a node using a non-virtual method call (the method is_<Node>() below).
620 //
621 // A class ID of an ideal node is a set of bits. In a class ID, a single bit determines
622 // the type of the node the ID represents; another subset of an ID's bits are reserved
623 // for the superclasses of the node represented by the ID.
624 //
625 // By design, if A is a supertype of B, A.is_B() returns true and B.is_A()
626 // returns false. A.is_A() returns true.
627 //
628 // If two classes, A and B, have the same superclass, a different bit of A's class id
629 // is reserved for A's type than for B's type. That bit is specified by the third
630 // parameter in the macro DEFINE_CLASS_ID.
631 //
632 // By convention, classes with deeper hierarchy are declared first. Moreover,
633 // classes with the same hierarchy depth are sorted by usage frequency.
634 //
635 // The query method masks the bits to cut off bits of subclasses and then compares
636 // the result with the class id (see the macro DEFINE_CLASS_QUERY below).
637 //
638 // Class_MachCall=30, ClassMask_MachCall=31
639 // 12 8 4 0
640 // 0 0 0 0 0 0 0 0 1 1 1 1 0
641 // | | | |
642 // | | | Bit_Mach=2
643 // | | Bit_MachReturn=4
644 // | Bit_MachSafePoint=8
645 // Bit_MachCall=16
646 //
647 // Class_CountedLoop=56, ClassMask_CountedLoop=63
648 // 12 8 4 0
649 // 0 0 0 0 0 0 0 1 1 1 0 0 0
650 // | | |
651 // | | Bit_Region=8
652 // | Bit_Loop=16
653 // Bit_CountedLoop=32
654
655 #define DEFINE_CLASS_ID(cl, supcl, subn) \
656 Bit_##cl = (Class_##supcl == 0) ? 1 << subn : (Bit_##supcl) << (1 + subn) , \
657 Class_##cl = Class_##supcl + Bit_##cl , \
658 ClassMask_##cl = ((Bit_##cl << 1) - 1) ,
659
660 // This enum is used only for C2 ideal and mach nodes with is_<node>() methods
661 // so that its values fit into 32 bits.
662 enum NodeClasses {
663 Bit_Node = 0x00000000,
664 Class_Node = 0x00000000,
665 ClassMask_Node = 0xFFFFFFFF,
666
667 DEFINE_CLASS_ID(Multi, Node, 0)
668 DEFINE_CLASS_ID(SafePoint, Multi, 0)
669 DEFINE_CLASS_ID(Call, SafePoint, 0)
670 DEFINE_CLASS_ID(CallJava, Call, 0)
671 DEFINE_CLASS_ID(CallStaticJava, CallJava, 0)
672 DEFINE_CLASS_ID(CallDynamicJava, CallJava, 1)
673 DEFINE_CLASS_ID(CallRuntime, Call, 1)
674 DEFINE_CLASS_ID(CallLeaf, CallRuntime, 0)
675 DEFINE_CLASS_ID(CallLeafNoFP, CallLeaf, 0)
676 DEFINE_CLASS_ID(Allocate, Call, 2)
677 DEFINE_CLASS_ID(AllocateArray, Allocate, 0)
678 DEFINE_CLASS_ID(AbstractLock, Call, 3)
679 DEFINE_CLASS_ID(Lock, AbstractLock, 0)
680 DEFINE_CLASS_ID(Unlock, AbstractLock, 1)
681 DEFINE_CLASS_ID(ArrayCopy, Call, 4)
682 DEFINE_CLASS_ID(MultiBranch, Multi, 1)
683 DEFINE_CLASS_ID(PCTable, MultiBranch, 0)
684 DEFINE_CLASS_ID(Catch, PCTable, 0)
685 DEFINE_CLASS_ID(Jump, PCTable, 1)
686 DEFINE_CLASS_ID(If, MultiBranch, 1)
687 DEFINE_CLASS_ID(BaseCountedLoopEnd, If, 0)
688 DEFINE_CLASS_ID(CountedLoopEnd, BaseCountedLoopEnd, 0)
689 DEFINE_CLASS_ID(LongCountedLoopEnd, BaseCountedLoopEnd, 1)
690 DEFINE_CLASS_ID(RangeCheck, If, 1)
691 DEFINE_CLASS_ID(OuterStripMinedLoopEnd, If, 2)
692 DEFINE_CLASS_ID(ParsePredicate, If, 3)
693 DEFINE_CLASS_ID(NeverBranch, MultiBranch, 2)
694 DEFINE_CLASS_ID(Start, Multi, 2)
695 DEFINE_CLASS_ID(MemBar, Multi, 3)
696 DEFINE_CLASS_ID(Initialize, MemBar, 0)
697 DEFINE_CLASS_ID(MemBarStoreStore, MemBar, 1)
698
699 DEFINE_CLASS_ID(Mach, Node, 1)
700 DEFINE_CLASS_ID(MachReturn, Mach, 0)
701 DEFINE_CLASS_ID(MachSafePoint, MachReturn, 0)
702 DEFINE_CLASS_ID(MachCall, MachSafePoint, 0)
703 DEFINE_CLASS_ID(MachCallJava, MachCall, 0)
704 DEFINE_CLASS_ID(MachCallStaticJava, MachCallJava, 0)
705 DEFINE_CLASS_ID(MachCallDynamicJava, MachCallJava, 1)
706 DEFINE_CLASS_ID(MachCallRuntime, MachCall, 1)
707 DEFINE_CLASS_ID(MachCallLeaf, MachCallRuntime, 0)
708 DEFINE_CLASS_ID(MachBranch, Mach, 1)
709 DEFINE_CLASS_ID(MachIf, MachBranch, 0)
710 DEFINE_CLASS_ID(MachGoto, MachBranch, 1)
711 DEFINE_CLASS_ID(MachNullCheck, MachBranch, 2)
712 DEFINE_CLASS_ID(MachSpillCopy, Mach, 2)
713 DEFINE_CLASS_ID(MachTemp, Mach, 3)
714 DEFINE_CLASS_ID(MachConstantBase, Mach, 4)
715 DEFINE_CLASS_ID(MachConstant, Mach, 5)
716 DEFINE_CLASS_ID(MachJump, MachConstant, 0)
717 DEFINE_CLASS_ID(MachMerge, Mach, 6)
718 DEFINE_CLASS_ID(MachMemBar, Mach, 7)
719
720 DEFINE_CLASS_ID(Type, Node, 2)
721 DEFINE_CLASS_ID(Phi, Type, 0)
722 DEFINE_CLASS_ID(ConstraintCast, Type, 1)
723 DEFINE_CLASS_ID(CastII, ConstraintCast, 0)
724 DEFINE_CLASS_ID(CheckCastPP, ConstraintCast, 1)
725 DEFINE_CLASS_ID(CastLL, ConstraintCast, 2)
726 DEFINE_CLASS_ID(CastFF, ConstraintCast, 3)
727 DEFINE_CLASS_ID(CastDD, ConstraintCast, 4)
728 DEFINE_CLASS_ID(CastVV, ConstraintCast, 5)
729 DEFINE_CLASS_ID(CastPP, ConstraintCast, 6)
730 DEFINE_CLASS_ID(CastHH, ConstraintCast, 7)
731 DEFINE_CLASS_ID(CMove, Type, 3)
732 DEFINE_CLASS_ID(SafePointScalarObject, Type, 4)
733 DEFINE_CLASS_ID(DecodeNarrowPtr, Type, 5)
734 DEFINE_CLASS_ID(DecodeN, DecodeNarrowPtr, 0)
735 DEFINE_CLASS_ID(DecodeNKlass, DecodeNarrowPtr, 1)
736 DEFINE_CLASS_ID(EncodeNarrowPtr, Type, 6)
737 DEFINE_CLASS_ID(EncodeP, EncodeNarrowPtr, 0)
738 DEFINE_CLASS_ID(EncodePKlass, EncodeNarrowPtr, 1)
739 DEFINE_CLASS_ID(Vector, Type, 7)
740 DEFINE_CLASS_ID(VectorMaskCmp, Vector, 0)
741 DEFINE_CLASS_ID(VectorUnbox, Vector, 1)
742 DEFINE_CLASS_ID(VectorReinterpret, Vector, 2)
743 DEFINE_CLASS_ID(ShiftV, Vector, 3)
744 DEFINE_CLASS_ID(CompressV, Vector, 4)
745 DEFINE_CLASS_ID(ExpandV, Vector, 5)
746 DEFINE_CLASS_ID(CompressM, Vector, 6)
747 DEFINE_CLASS_ID(Reduction, Vector, 7)
748 DEFINE_CLASS_ID(NegV, Vector, 8)
749 DEFINE_CLASS_ID(SaturatingVector, Vector, 9)
750 DEFINE_CLASS_ID(MulVL, Vector, 10)
751 DEFINE_CLASS_ID(Con, Type, 8)
752 DEFINE_CLASS_ID(ConI, Con, 0)
753 DEFINE_CLASS_ID(SafePointScalarMerge, Type, 9)
754 DEFINE_CLASS_ID(Convert, Type, 10)
755
756
757 DEFINE_CLASS_ID(Proj, Node, 3)
758 DEFINE_CLASS_ID(CatchProj, Proj, 0)
759 DEFINE_CLASS_ID(JumpProj, Proj, 1)
760 DEFINE_CLASS_ID(IfProj, Proj, 2)
761 DEFINE_CLASS_ID(IfTrue, IfProj, 0)
762 DEFINE_CLASS_ID(IfFalse, IfProj, 1)
763 DEFINE_CLASS_ID(Parm, Proj, 4)
764 DEFINE_CLASS_ID(MachProj, Proj, 5)
765
766 DEFINE_CLASS_ID(Mem, Node, 4)
767 DEFINE_CLASS_ID(Load, Mem, 0)
768 DEFINE_CLASS_ID(LoadVector, Load, 0)
769 DEFINE_CLASS_ID(LoadVectorGather, LoadVector, 0)
770 DEFINE_CLASS_ID(LoadVectorGatherMasked, LoadVector, 1)
771 DEFINE_CLASS_ID(LoadVectorMasked, LoadVector, 2)
772 DEFINE_CLASS_ID(Store, Mem, 1)
773 DEFINE_CLASS_ID(StoreVector, Store, 0)
774 DEFINE_CLASS_ID(StoreVectorScatter, StoreVector, 0)
775 DEFINE_CLASS_ID(StoreVectorScatterMasked, StoreVector, 1)
776 DEFINE_CLASS_ID(StoreVectorMasked, StoreVector, 2)
777 DEFINE_CLASS_ID(LoadStore, Mem, 2)
778 DEFINE_CLASS_ID(LoadStoreConditional, LoadStore, 0)
779 DEFINE_CLASS_ID(CompareAndSwap, LoadStoreConditional, 0)
780 DEFINE_CLASS_ID(CompareAndExchangeNode, LoadStore, 1)
781
782 DEFINE_CLASS_ID(Region, Node, 5)
783 DEFINE_CLASS_ID(Loop, Region, 0)
784 DEFINE_CLASS_ID(Root, Loop, 0)
785 DEFINE_CLASS_ID(BaseCountedLoop, Loop, 1)
786 DEFINE_CLASS_ID(CountedLoop, BaseCountedLoop, 0)
787 DEFINE_CLASS_ID(LongCountedLoop, BaseCountedLoop, 1)
788 DEFINE_CLASS_ID(OuterStripMinedLoop, Loop, 2)
789
790 DEFINE_CLASS_ID(Sub, Node, 6)
791 DEFINE_CLASS_ID(Cmp, Sub, 0)
792 DEFINE_CLASS_ID(FastLock, Cmp, 0)
793 DEFINE_CLASS_ID(FastUnlock, Cmp, 1)
794 DEFINE_CLASS_ID(SubTypeCheck,Cmp, 2)
795
796 DEFINE_CLASS_ID(MergeMem, Node, 7)
797 DEFINE_CLASS_ID(Bool, Node, 8)
798 DEFINE_CLASS_ID(AddP, Node, 9)
799 DEFINE_CLASS_ID(BoxLock, Node, 10)
800 DEFINE_CLASS_ID(Add, Node, 11)
801 DEFINE_CLASS_ID(Mul, Node, 12)
802 DEFINE_CLASS_ID(ClearArray, Node, 14)
803 DEFINE_CLASS_ID(Halt, Node, 15)
804 DEFINE_CLASS_ID(Opaque1, Node, 16)
805 DEFINE_CLASS_ID(OpaqueLoopInit, Opaque1, 0)
806 DEFINE_CLASS_ID(OpaqueLoopStride, Opaque1, 1)
807 DEFINE_CLASS_ID(OpaqueMultiversioning, Opaque1, 2)
808 DEFINE_CLASS_ID(OpaqueNotNull, Node, 17)
809 DEFINE_CLASS_ID(OpaqueInitializedAssertionPredicate, Node, 18)
810 DEFINE_CLASS_ID(OpaqueTemplateAssertionPredicate, Node, 19)
811 DEFINE_CLASS_ID(Move, Node, 20)
812 DEFINE_CLASS_ID(LShift, Node, 21)
813 DEFINE_CLASS_ID(Neg, Node, 22)
814
815 _max_classes = ClassMask_Neg
816 };
817 #undef DEFINE_CLASS_ID
818
819 // Flags are sorted by usage frequency.
820 enum NodeFlags {
821 Flag_is_Copy = 1 << 0, // should be first bit to avoid shift
822 Flag_rematerialize = 1 << 1,
823 Flag_needs_anti_dependence_check = 1 << 2,
824 Flag_is_macro = 1 << 3,
825 Flag_is_Con = 1 << 4,
826 Flag_is_cisc_alternate = 1 << 5,
827 Flag_is_dead_loop_safe = 1 << 6,
828 Flag_may_be_short_branch = 1 << 7,
829 Flag_avoid_back_to_back_before = 1 << 8,
830 Flag_avoid_back_to_back_after = 1 << 9,
831 Flag_has_call = 1 << 10,
832 Flag_has_swapped_edges = 1 << 11,
833 Flag_is_scheduled = 1 << 12,
834 Flag_is_expensive = 1 << 13,
835 Flag_is_predicated_vector = 1 << 14,
836 Flag_for_post_loop_opts_igvn = 1 << 15,
837 Flag_for_merge_stores_igvn = 1 << 16,
838 Flag_is_removed_by_peephole = 1 << 17,
839 Flag_is_predicated_using_blend = 1 << 18,
840 _last_flag = Flag_is_predicated_using_blend
841 };
842
843 class PD;
844
845 private:
846 juint _class_id;
847 juint _flags;
848
849 #ifdef ASSERT
850 static juint max_flags();
851 #endif
852
853 protected:
854 // These methods should be called from constructors only.
855 void init_class_id(juint c) {
856 _class_id = c; // cast out const
857 }
858 void init_flags(uint fl) {
859 assert(fl <= max_flags(), "invalid node flag");
860 _flags |= fl;
861 }
862 void clear_flag(uint fl) {
863 assert(fl <= max_flags(), "invalid node flag");
864 _flags &= ~fl;
865 }
866
867 public:
868 juint class_id() const { return _class_id; }
869
870 juint flags() const { return _flags; }
871
872 void add_flag(juint fl) { init_flags(fl); }
873
874 void remove_flag(juint fl) { clear_flag(fl); }
875
876 // Return a dense integer opcode number
877 virtual int Opcode() const;
878
879 // Virtual inherited Node size
880 virtual uint size_of() const;
881
882 // Other interesting Node properties
883 #define DEFINE_CLASS_QUERY(type) \
884 bool is_##type() const { \
885 return ((_class_id & ClassMask_##type) == Class_##type); \
886 } \
887 type##Node *as_##type() const { \
888 assert(is_##type(), "invalid node class: %s", Name()); \
889 return (type##Node*)this; \
890 } \
891 type##Node* isa_##type() const { \
892 return (is_##type()) ? as_##type() : nullptr; \
893 }
894
895 DEFINE_CLASS_QUERY(AbstractLock)
896 DEFINE_CLASS_QUERY(Add)
897 DEFINE_CLASS_QUERY(AddP)
898 DEFINE_CLASS_QUERY(Allocate)
899 DEFINE_CLASS_QUERY(AllocateArray)
900 DEFINE_CLASS_QUERY(ArrayCopy)
901 DEFINE_CLASS_QUERY(BaseCountedLoop)
902 DEFINE_CLASS_QUERY(BaseCountedLoopEnd)
903 DEFINE_CLASS_QUERY(Bool)
904 DEFINE_CLASS_QUERY(BoxLock)
905 DEFINE_CLASS_QUERY(Call)
906 DEFINE_CLASS_QUERY(CallDynamicJava)
907 DEFINE_CLASS_QUERY(CallJava)
908 DEFINE_CLASS_QUERY(CallLeaf)
909 DEFINE_CLASS_QUERY(CallLeafNoFP)
910 DEFINE_CLASS_QUERY(CallRuntime)
911 DEFINE_CLASS_QUERY(CallStaticJava)
912 DEFINE_CLASS_QUERY(Catch)
913 DEFINE_CLASS_QUERY(CatchProj)
914 DEFINE_CLASS_QUERY(CheckCastPP)
915 DEFINE_CLASS_QUERY(CastII)
916 DEFINE_CLASS_QUERY(CastLL)
917 DEFINE_CLASS_QUERY(CastFF)
918 DEFINE_CLASS_QUERY(ConI)
919 DEFINE_CLASS_QUERY(CastPP)
920 DEFINE_CLASS_QUERY(ConstraintCast)
921 DEFINE_CLASS_QUERY(ClearArray)
922 DEFINE_CLASS_QUERY(CMove)
923 DEFINE_CLASS_QUERY(Cmp)
924 DEFINE_CLASS_QUERY(Convert)
925 DEFINE_CLASS_QUERY(CountedLoop)
926 DEFINE_CLASS_QUERY(CountedLoopEnd)
927 DEFINE_CLASS_QUERY(DecodeNarrowPtr)
928 DEFINE_CLASS_QUERY(DecodeN)
929 DEFINE_CLASS_QUERY(DecodeNKlass)
930 DEFINE_CLASS_QUERY(EncodeNarrowPtr)
931 DEFINE_CLASS_QUERY(EncodeP)
932 DEFINE_CLASS_QUERY(EncodePKlass)
933 DEFINE_CLASS_QUERY(FastLock)
934 DEFINE_CLASS_QUERY(FastUnlock)
935 DEFINE_CLASS_QUERY(Halt)
936 DEFINE_CLASS_QUERY(If)
937 DEFINE_CLASS_QUERY(RangeCheck)
938 DEFINE_CLASS_QUERY(IfProj)
939 DEFINE_CLASS_QUERY(IfFalse)
940 DEFINE_CLASS_QUERY(IfTrue)
941 DEFINE_CLASS_QUERY(Initialize)
942 DEFINE_CLASS_QUERY(Jump)
943 DEFINE_CLASS_QUERY(JumpProj)
944 DEFINE_CLASS_QUERY(LongCountedLoop)
945 DEFINE_CLASS_QUERY(LongCountedLoopEnd)
946 DEFINE_CLASS_QUERY(Load)
947 DEFINE_CLASS_QUERY(LoadStore)
948 DEFINE_CLASS_QUERY(LoadStoreConditional)
949 DEFINE_CLASS_QUERY(Lock)
950 DEFINE_CLASS_QUERY(Loop)
951 DEFINE_CLASS_QUERY(LShift)
952 DEFINE_CLASS_QUERY(Mach)
953 DEFINE_CLASS_QUERY(MachBranch)
954 DEFINE_CLASS_QUERY(MachCall)
955 DEFINE_CLASS_QUERY(MachCallDynamicJava)
956 DEFINE_CLASS_QUERY(MachCallJava)
957 DEFINE_CLASS_QUERY(MachCallLeaf)
958 DEFINE_CLASS_QUERY(MachCallRuntime)
959 DEFINE_CLASS_QUERY(MachCallStaticJava)
960 DEFINE_CLASS_QUERY(MachConstantBase)
961 DEFINE_CLASS_QUERY(MachConstant)
962 DEFINE_CLASS_QUERY(MachGoto)
963 DEFINE_CLASS_QUERY(MachIf)
964 DEFINE_CLASS_QUERY(MachJump)
965 DEFINE_CLASS_QUERY(MachNullCheck)
966 DEFINE_CLASS_QUERY(MachProj)
967 DEFINE_CLASS_QUERY(MachReturn)
968 DEFINE_CLASS_QUERY(MachSafePoint)
969 DEFINE_CLASS_QUERY(MachSpillCopy)
970 DEFINE_CLASS_QUERY(MachTemp)
971 DEFINE_CLASS_QUERY(MachMemBar)
972 DEFINE_CLASS_QUERY(MachMerge)
973 DEFINE_CLASS_QUERY(Mem)
974 DEFINE_CLASS_QUERY(MemBar)
975 DEFINE_CLASS_QUERY(MemBarStoreStore)
976 DEFINE_CLASS_QUERY(MergeMem)
977 DEFINE_CLASS_QUERY(Move)
978 DEFINE_CLASS_QUERY(Mul)
979 DEFINE_CLASS_QUERY(Multi)
980 DEFINE_CLASS_QUERY(MultiBranch)
981 DEFINE_CLASS_QUERY(MulVL)
982 DEFINE_CLASS_QUERY(Neg)
983 DEFINE_CLASS_QUERY(NegV)
984 DEFINE_CLASS_QUERY(NeverBranch)
985 DEFINE_CLASS_QUERY(Opaque1)
986 DEFINE_CLASS_QUERY(OpaqueNotNull)
987 DEFINE_CLASS_QUERY(OpaqueInitializedAssertionPredicate)
988 DEFINE_CLASS_QUERY(OpaqueTemplateAssertionPredicate)
989 DEFINE_CLASS_QUERY(OpaqueLoopInit)
990 DEFINE_CLASS_QUERY(OpaqueLoopStride)
991 DEFINE_CLASS_QUERY(OpaqueMultiversioning)
992 DEFINE_CLASS_QUERY(OuterStripMinedLoop)
993 DEFINE_CLASS_QUERY(OuterStripMinedLoopEnd)
994 DEFINE_CLASS_QUERY(Parm)
995 DEFINE_CLASS_QUERY(ParsePredicate)
996 DEFINE_CLASS_QUERY(PCTable)
997 DEFINE_CLASS_QUERY(Phi)
998 DEFINE_CLASS_QUERY(Proj)
999 DEFINE_CLASS_QUERY(Reduction)
1000 DEFINE_CLASS_QUERY(Region)
1001 DEFINE_CLASS_QUERY(Root)
1002 DEFINE_CLASS_QUERY(SafePoint)
1003 DEFINE_CLASS_QUERY(SafePointScalarObject)
1004 DEFINE_CLASS_QUERY(SafePointScalarMerge)
1005 DEFINE_CLASS_QUERY(Start)
1006 DEFINE_CLASS_QUERY(Store)
1007 DEFINE_CLASS_QUERY(Sub)
1008 DEFINE_CLASS_QUERY(SubTypeCheck)
1009 DEFINE_CLASS_QUERY(Type)
1010 DEFINE_CLASS_QUERY(Vector)
1011 DEFINE_CLASS_QUERY(VectorMaskCmp)
1012 DEFINE_CLASS_QUERY(VectorUnbox)
1013 DEFINE_CLASS_QUERY(VectorReinterpret)
1014 DEFINE_CLASS_QUERY(CompressV)
1015 DEFINE_CLASS_QUERY(ExpandV)
1016 DEFINE_CLASS_QUERY(CompressM)
1017 DEFINE_CLASS_QUERY(LoadVector)
1018 DEFINE_CLASS_QUERY(LoadVectorGather)
1019 DEFINE_CLASS_QUERY(LoadVectorMasked)
1020 DEFINE_CLASS_QUERY(LoadVectorGatherMasked)
1021 DEFINE_CLASS_QUERY(StoreVector)
1022 DEFINE_CLASS_QUERY(StoreVectorScatter)
1023 DEFINE_CLASS_QUERY(StoreVectorMasked)
1024 DEFINE_CLASS_QUERY(StoreVectorScatterMasked)
1025 DEFINE_CLASS_QUERY(SaturatingVector)
1026 DEFINE_CLASS_QUERY(ShiftV)
1027 DEFINE_CLASS_QUERY(Unlock)
1028
1029 #undef DEFINE_CLASS_QUERY
1030
1031 // duplicate of is_MachSpillCopy()
1032 bool is_SpillCopy () const {
1033 return ((_class_id & ClassMask_MachSpillCopy) == Class_MachSpillCopy);
1034 }
1035
1036 bool is_Con () const { return (_flags & Flag_is_Con) != 0; }
1037 // The data node which is safe to leave in dead loop during IGVN optimization.
1038 bool is_dead_loop_safe() const;
1039
1040 // is_Copy() returns copied edge index (0 or 1)
1041 uint is_Copy() const { return (_flags & Flag_is_Copy); }
1042
1043 virtual bool is_CFG() const { return false; }
1044
1045 // If this node is control-dependent on a test, can it be
1046 // rerouted to a dominating equivalent test? This is usually
1047 // true of non-CFG nodes, but can be false for operations which
1048 // depend for their correct sequencing on more than one test.
1049 // (In that case, hoisting to a dominating test may silently
1050 // skip some other important test.)
1051 virtual bool depends_only_on_test() const { assert(!is_CFG(), ""); return true; };
1052
1053 // When building basic blocks, I need to have a notion of block beginning
1054 // Nodes, next block selector Nodes (block enders), and next block
1055 // projections. These calls need to work on their machine equivalents. The
1056 // Ideal beginning Nodes are RootNode, RegionNode and StartNode.
1057 bool is_block_start() const {
1058 if ( is_Region() )
1059 return this == (const Node*)in(0);
1060 else
1061 return is_Start();
1062 }
1063
1064 // The Ideal control projection Nodes are IfTrue/IfFalse, JumpProjNode, Root,
1065 // Goto and Return. This call also returns the block ending Node.
1066 virtual const Node *is_block_proj() const;
1067
1068 // The node is a "macro" node which needs to be expanded before matching
1069 bool is_macro() const { return (_flags & Flag_is_macro) != 0; }
1070 // The node is expensive: the best control is set during loop opts
1071 bool is_expensive() const { return (_flags & Flag_is_expensive) != 0 && in(0) != nullptr; }
1072 // The node's original edge position is swapped.
1073 bool has_swapped_edges() const { return (_flags & Flag_has_swapped_edges) != 0; }
1074
1075 bool is_predicated_vector() const { return (_flags & Flag_is_predicated_vector) != 0; }
1076
1077 bool is_predicated_using_blend() const { return (_flags & Flag_is_predicated_using_blend) != 0; }
1078
1079 // Used in lcm to mark nodes that have scheduled
1080 bool is_scheduled() const { return (_flags & Flag_is_scheduled) != 0; }
1081
1082 bool for_post_loop_opts_igvn() const { return (_flags & Flag_for_post_loop_opts_igvn) != 0; }
1083 bool for_merge_stores_igvn() const { return (_flags & Flag_for_merge_stores_igvn) != 0; }
1084
1085 // Is 'n' possibly a loop entry (i.e. a Parse Predicate projection)?
1086 static bool may_be_loop_entry(Node* n) {
1087 return n != nullptr && n->is_IfProj() && n->in(0)->is_ParsePredicate();
1088 }
1089
1090 //----------------- Optimization
1091
1092 // Get the worst-case Type output for this Node.
1093 virtual const class Type *bottom_type() const;
1094
1095 // If we find a better type for a node, try to record it permanently.
1096 // Return true if this node actually changed.
1097 // Be sure to do the hash_delete game in the "rehash" variant.
1098 void raise_bottom_type(const Type* new_type);
1099
1100 // Get the address type with which this node uses and/or defs memory,
1101 // or null if none. The address type is conservatively wide.
1102 // Returns non-null for calls, membars, loads, stores, etc.
1103 // Returns TypePtr::BOTTOM if the node touches memory "broadly".
1104 virtual const class TypePtr *adr_type() const { return nullptr; }
1105
1106 // Return an existing node which computes the same function as this node.
1107 // The optimistic combined algorithm requires this to return a Node which
1108 // is a small number of steps away (e.g., one of my inputs).
1109 virtual Node* Identity(PhaseGVN* phase);
1110
1111 // Return the set of values this Node can take on at runtime.
1112 virtual const Type* Value(PhaseGVN* phase) const;
1113
1114 // Return a node which is more "ideal" than the current node.
1115 // The invariants on this call are subtle. If in doubt, read the
1116 // treatise in node.cpp above the default implementation AND TEST WITH
1117 // -XX:VerifyIterativeGVN=1
1118 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
1119
1120 // Some nodes have specific Ideal subgraph transformations only if they are
1121 // unique users of specific nodes. Such nodes should be put on IGVN worklist
1122 // for the transformations to happen.
1123 bool has_special_unique_user() const;
1124
1125 // Skip Proj and CatchProj nodes chains. Check for Null and Top.
1126 Node* find_exact_control(Node* ctrl);
1127
1128 // Results of the dominance analysis.
1129 enum class DomResult {
1130 NotDominate, // 'this' node does not dominate 'sub'.
1131 Dominate, // 'this' node dominates or is equal to 'sub'.
1132 EncounteredDeadCode // Result is undefined due to encountering dead code.
1133 };
1134 // Check if 'this' node dominates or equal to 'sub'.
1135 DomResult dominates(Node* sub, Node_List &nlist);
1136
1137 bool remove_dead_region(PhaseGVN *phase, bool can_reshape);
1138 public:
1139
1140 // See if there is valid pipeline info
1141 static const Pipeline *pipeline_class();
1142 virtual const Pipeline *pipeline() const;
1143
1144 // Compute the latency from the def to this instruction of the ith input node
1145 uint latency(uint i);
1146
1147 // Hash & compare functions, for pessimistic value numbering
1148
1149 // If the hash function returns the special sentinel value NO_HASH,
1150 // the node is guaranteed never to compare equal to any other node.
1151 // If we accidentally generate a hash with value NO_HASH the node
1152 // won't go into the table and we'll lose a little optimization.
1153 static const uint NO_HASH = 0;
1154 virtual uint hash() const;
1155 virtual bool cmp( const Node &n ) const;
1156
1157 // Operation appears to be iteratively computed (such as an induction variable)
1158 // It is possible for this operation to return false for a loop-varying
1159 // value, if it appears (by local graph inspection) to be computed by a simple conditional.
1160 bool is_iteratively_computed();
1161
1162 // Determine if a node is a counted loop induction variable.
1163 // NOTE: The method is defined in "loopnode.cpp".
1164 bool is_cloop_ind_var() const;
1165
1166 // Return a node with opcode "opc" and same inputs as "this" if one can
1167 // be found; Otherwise return null;
1168 Node* find_similar(int opc);
1169
1170 // Return the unique control out if only one. Null if none or more than one.
1171 Node* unique_ctrl_out_or_null() const;
1172 // Return the unique control out. Asserts if none or more than one control out.
1173 Node* unique_ctrl_out() const;
1174
1175 // Set control or add control as precedence edge
1176 void ensure_control_or_add_prec(Node* c);
1177 void add_prec_from(Node* n);
1178
1179 // Visit boundary uses of the node and apply a callback function for each.
1180 // Recursively traverse uses, stopping and applying the callback when
1181 // reaching a boundary node, defined by is_boundary. Note: the function
1182 // definition appears after the complete type definition of Node_List.
1183 template <typename Callback, typename Check>
1184 void visit_uses(Callback callback, Check is_boundary) const;
1185
1186 // Returns a clone of the current node that's pinned (if the current node is not) for nodes found in array accesses
1187 // (Load and range check CastII nodes).
1188 // This is used when an array access is made dependent on 2 or more range checks (range check smearing or Loop Predication).
1189 virtual Node* pin_array_access_node() const {
1190 return nullptr;
1191 }
1192
1193 //----------------- Code Generation
1194
1195 // Ideal register class for Matching. Zero means unmatched instruction
1196 // (these are cloned instead of converted to machine nodes).
1197 virtual uint ideal_reg() const;
1198
1199 static const uint NotAMachineReg; // must be > max. machine register
1200
1201 // Do we Match on this edge index or not? Generally false for Control
1202 // and true for everything else. Weird for calls & returns.
1203 virtual uint match_edge(uint idx) const;
1204
1205 // Register class output is returned in
1206 virtual const RegMask &out_RegMask() const;
1207 // Register class input is expected in
1208 virtual const RegMask &in_RegMask(uint) const;
1209 // Should we clone rather than spill this instruction?
1210 bool rematerialize() const;
1211
1212 // Return JVM State Object if this Node carries debug info, or null otherwise
1213 virtual JVMState* jvms() const;
1214
1215 // Print as assembly
1216 virtual void format( PhaseRegAlloc *, outputStream* st = tty ) const;
1217 // Emit bytes using C2_MacroAssembler
1218 virtual void emit(C2_MacroAssembler *masm, PhaseRegAlloc *ra_) const;
1219 // Size of instruction in bytes
1220 virtual uint size(PhaseRegAlloc *ra_) const;
1221
1222 // Convenience function to extract an integer constant from a node.
1223 // If it is not an integer constant (either Con, CastII, or Mach),
1224 // return value_if_unknown.
1225 jint find_int_con(jint value_if_unknown) const {
1226 const TypeInt* t = find_int_type();
1227 return (t != nullptr && t->is_con()) ? t->get_con() : value_if_unknown;
1228 }
1229 // Return the constant, knowing it is an integer constant already
1230 jint get_int() const {
1231 const TypeInt* t = find_int_type();
1232 guarantee(t != nullptr, "must be con");
1233 return t->get_con();
1234 }
1235 // Here's where the work is done. Can produce non-constant int types too.
1236 const TypeInt* find_int_type() const;
1237 const TypeInteger* find_integer_type(BasicType bt) const;
1238
1239 // Same thing for long (and intptr_t, via type.hpp):
1240 jlong get_long() const {
1241 const TypeLong* t = find_long_type();
1242 guarantee(t != nullptr, "must be con");
1243 return t->get_con();
1244 }
1245 jlong find_long_con(jint value_if_unknown) const {
1246 const TypeLong* t = find_long_type();
1247 return (t != nullptr && t->is_con()) ? t->get_con() : value_if_unknown;
1248 }
1249 const TypeLong* find_long_type() const;
1250
1251 jlong get_integer_as_long(BasicType bt) const {
1252 const TypeInteger* t = find_integer_type(bt);
1253 guarantee(t != nullptr && t->is_con(), "must be con");
1254 return t->get_con_as_long(bt);
1255 }
1256 jlong find_integer_as_long(BasicType bt, jlong value_if_unknown) const {
1257 const TypeInteger* t = find_integer_type(bt);
1258 if (t == nullptr || !t->is_con()) return value_if_unknown;
1259 return t->get_con_as_long(bt);
1260 }
1261 const TypePtr* get_ptr_type() const;
1262
1263 // These guys are called by code generated by ADLC:
1264 intptr_t get_ptr() const;
1265 intptr_t get_narrowcon() const;
1266 jdouble getd() const;
1267 jfloat getf() const;
1268 jshort geth() const;
1269
1270 // Nodes which are pinned into basic blocks
1271 virtual bool pinned() const { return false; }
1272
1273 // Nodes which use memory without consuming it, hence need antidependences
1274 // More specifically, needs_anti_dependence_check returns true iff the node
1275 // (a) does a load, and (b) does not perform a store (except perhaps to a
1276 // stack slot or some other unaliased location).
1277 bool needs_anti_dependence_check() const;
1278
1279 // Return which operand this instruction may cisc-spill. In other words,
1280 // return operand position that can convert from reg to memory access
1281 virtual int cisc_operand() const { return AdlcVMDeps::Not_cisc_spillable; }
1282 bool is_cisc_alternate() const { return (_flags & Flag_is_cisc_alternate) != 0; }
1283
1284 // Whether this is a memory-writing machine node.
1285 bool is_memory_writer() const { return is_Mach() && bottom_type()->has_memory(); }
1286
1287 // Whether this is a memory phi node
1288 bool is_memory_phi() const { return is_Phi() && bottom_type() == Type::MEMORY; }
1289
1290 bool is_div_or_mod(BasicType bt) const;
1291
1292 bool is_pure_function() const;
1293
1294 bool is_data_proj_of_pure_function(const Node* maybe_pure_function) const;
1295
1296 //----------------- Printing, etc
1297 #ifndef PRODUCT
1298 public:
1299 Node* find(int idx, bool only_ctrl = false); // Search the graph for the given idx.
1300 Node* find_ctrl(int idx); // Search control ancestors for the given idx.
1301 void dump_bfs(const int max_distance, Node* target, const char* options, outputStream* st, const frame* fr = nullptr) const;
1302 void dump_bfs(const int max_distance, Node* target, const char* options) const; // directly to tty
1303 void dump_bfs(const int max_distance) const; // dump_bfs(max_distance, nullptr, nullptr)
1304 void dump_bfs(const int max_distance, Node* target, const char* options, void* sp, void* fp, void* pc) const;
1305 class DumpConfig {
1306 public:
1307 // overridden to implement coloring of node idx
1308 virtual void pre_dump(outputStream *st, const Node* n) = 0;
1309 virtual void post_dump(outputStream *st) = 0;
1310 };
1311 void dump_idx(bool align = false, outputStream* st = tty, DumpConfig* dc = nullptr) const;
1312 void dump_name(outputStream* st = tty, DumpConfig* dc = nullptr) const;
1313 void dump() const; // print node with newline
1314 void dump(const char* suffix, bool mark = false, outputStream* st = tty, DumpConfig* dc = nullptr) const; // Print this node.
1315 void dump(int depth) const; // Print this node, recursively to depth d
1316 void dump_ctrl(int depth) const; // Print control nodes, to depth d
1317 void dump_comp() const; // Print this node in compact representation.
1318 // Print this node in compact representation.
1319 void dump_comp(const char* suffix, outputStream *st = tty) const;
1320 private:
1321 virtual void dump_req(outputStream* st = tty, DumpConfig* dc = nullptr) const; // Print required-edge info
1322 virtual void dump_prec(outputStream* st = tty, DumpConfig* dc = nullptr) const; // Print precedence-edge info
1323 virtual void dump_out(outputStream* st = tty, DumpConfig* dc = nullptr) const; // Print the output edge info
1324 public:
1325 virtual void dump_spec(outputStream *st) const {}; // Print per-node info
1326 // Print compact per-node info
1327 virtual void dump_compact_spec(outputStream *st) const { dump_spec(st); }
1328
1329 static void verify(int verify_depth, VectorSet& visited, Node_List& worklist);
1330
1331 // This call defines a class-unique string used to identify class instances
1332 virtual const char *Name() const;
1333
1334 void dump_format(PhaseRegAlloc *ra) const; // debug access to MachNode::format(...)
1335 static bool in_dump() { return Compile::current()->_in_dump_cnt > 0; } // check if we are in a dump call
1336 #endif
1337 #ifdef ASSERT
1338 void verify_construction();
1339 bool verify_jvms(const JVMState* jvms) const;
1340
1341 Node* _debug_orig; // Original version of this, if any.
1342 Node* debug_orig() const { return _debug_orig; }
1343 void set_debug_orig(Node* orig); // _debug_orig = orig
1344 void dump_orig(outputStream *st, bool print_key = true) const;
1345
1346 uint64_t _debug_idx; // Unique value assigned to every node.
1347 uint64_t debug_idx() const { return _debug_idx; }
1348 void set_debug_idx(uint64_t debug_idx) { _debug_idx = debug_idx; }
1349
1350 int _hash_lock; // Barrier to modifications of nodes in the hash table
1351 void enter_hash_lock() { ++_hash_lock; assert(_hash_lock < 99, "in too many hash tables?"); }
1352 void exit_hash_lock() { --_hash_lock; assert(_hash_lock >= 0, "mispaired hash locks"); }
1353
1354 static void init_NodeProperty();
1355
1356 #if OPTO_DU_ITERATOR_ASSERT
1357 const Node* _last_del; // The last deleted node.
1358 uint _del_tick; // Bumped when a deletion happens..
1359 #endif
1360 #endif
1361 };
1362
1363 inline bool not_a_node(const Node* n) {
1364 if (n == nullptr) return true;
1365 if (((intptr_t)n & 1) != 0) return true; // uninitialized, etc.
1366 if (*(address*)n == badAddress) return true; // kill by Node::destruct
1367 return false;
1368 }
1369
1370 //-----------------------------------------------------------------------------
1371 // Iterators over DU info, and associated Node functions.
1372
1373 #if OPTO_DU_ITERATOR_ASSERT
1374
1375 // Common code for assertion checking on DU iterators.
1376 class DUIterator_Common {
1377 #ifdef ASSERT
1378 protected:
1379 bool _vdui; // cached value of VerifyDUIterators
1380 const Node* _node; // the node containing the _out array
1381 uint _outcnt; // cached node->_outcnt
1382 uint _del_tick; // cached node->_del_tick
1383 Node* _last; // last value produced by the iterator
1384
1385 void sample(const Node* node); // used by c'tor to set up for verifies
1386 void verify(const Node* node, bool at_end_ok = false);
1387 void verify_resync();
1388 void reset(const DUIterator_Common& that);
1389
1390 // The VDUI_ONLY macro protects code conditionalized on VerifyDUIterators
1391 #define I_VDUI_ONLY(i,x) { if ((i)._vdui) { x; } }
1392 #else
1393 #define I_VDUI_ONLY(i,x) { }
1394 #endif //ASSERT
1395 };
1396
1397 #define VDUI_ONLY(x) I_VDUI_ONLY(*this, x)
1398
1399 // Default DU iterator. Allows appends onto the out array.
1400 // Allows deletion from the out array only at the current point.
1401 // Usage:
1402 // for (DUIterator i = x->outs(); x->has_out(i); i++) {
1403 // Node* y = x->out(i);
1404 // ...
1405 // }
1406 // Compiles in product mode to a unsigned integer index, which indexes
1407 // onto a repeatedly reloaded base pointer of x->_out. The loop predicate
1408 // also reloads x->_outcnt. If you delete, you must perform "--i" just
1409 // before continuing the loop. You must delete only the last-produced
1410 // edge. You must delete only a single copy of the last-produced edge,
1411 // or else you must delete all copies at once (the first time the edge
1412 // is produced by the iterator).
1413 class DUIterator : public DUIterator_Common {
1414 friend class Node;
1415
1416 // This is the index which provides the product-mode behavior.
1417 // Whatever the product-mode version of the system does to the
1418 // DUI index is done to this index. All other fields in
1419 // this class are used only for assertion checking.
1420 uint _idx;
1421
1422 #ifdef ASSERT
1423 uint _refresh_tick; // Records the refresh activity.
1424
1425 void sample(const Node* node); // Initialize _refresh_tick etc.
1426 void verify(const Node* node, bool at_end_ok = false);
1427 void verify_increment(); // Verify an increment operation.
1428 void verify_resync(); // Verify that we can back up over a deletion.
1429 void verify_finish(); // Verify that the loop terminated properly.
1430 void refresh(); // Resample verification info.
1431 void reset(const DUIterator& that); // Resample after assignment.
1432 #endif
1433
1434 DUIterator(const Node* node, int dummy_to_avoid_conversion)
1435 { _idx = 0; DEBUG_ONLY(sample(node)); }
1436
1437 public:
1438 // initialize to garbage; clear _vdui to disable asserts
1439 DUIterator()
1440 { /*initialize to garbage*/ DEBUG_ONLY(_vdui = false); }
1441
1442 DUIterator(const DUIterator& that)
1443 { _idx = that._idx; DEBUG_ONLY(_vdui = false; reset(that)); }
1444
1445 void operator++(int dummy_to_specify_postfix_op)
1446 { _idx++; VDUI_ONLY(verify_increment()); }
1447
1448 void operator--()
1449 { VDUI_ONLY(verify_resync()); --_idx; }
1450
1451 ~DUIterator()
1452 { VDUI_ONLY(verify_finish()); }
1453
1454 void operator=(const DUIterator& that)
1455 { _idx = that._idx; DEBUG_ONLY(reset(that)); }
1456 };
1457
1458 DUIterator Node::outs() const
1459 { return DUIterator(this, 0); }
1460 DUIterator& Node::refresh_out_pos(DUIterator& i) const
1461 { I_VDUI_ONLY(i, i.refresh()); return i; }
1462 bool Node::has_out(DUIterator& i) const
1463 { I_VDUI_ONLY(i, i.verify(this,true));return i._idx < _outcnt; }
1464 Node* Node::out(DUIterator& i) const
1465 { I_VDUI_ONLY(i, i.verify(this)); return DEBUG_ONLY(i._last=) _out[i._idx]; }
1466
1467
1468 // Faster DU iterator. Disallows insertions into the out array.
1469 // Allows deletion from the out array only at the current point.
1470 // Usage:
1471 // for (DUIterator_Fast imax, i = x->fast_outs(imax); i < imax; i++) {
1472 // Node* y = x->fast_out(i);
1473 // ...
1474 // }
1475 // Compiles in product mode to raw Node** pointer arithmetic, with
1476 // no reloading of pointers from the original node x. If you delete,
1477 // you must perform "--i; --imax" just before continuing the loop.
1478 // If you delete multiple copies of the same edge, you must decrement
1479 // imax, but not i, multiple times: "--i, imax -= num_edges".
1480 class DUIterator_Fast : public DUIterator_Common {
1481 friend class Node;
1482 friend class DUIterator_Last;
1483
1484 // This is the pointer which provides the product-mode behavior.
1485 // Whatever the product-mode version of the system does to the
1486 // DUI pointer is done to this pointer. All other fields in
1487 // this class are used only for assertion checking.
1488 Node** _outp;
1489
1490 #ifdef ASSERT
1491 void verify(const Node* node, bool at_end_ok = false);
1492 void verify_limit();
1493 void verify_resync();
1494 void verify_relimit(uint n);
1495 void reset(const DUIterator_Fast& that);
1496 #endif
1497
1498 // Note: offset must be signed, since -1 is sometimes passed
1499 DUIterator_Fast(const Node* node, ptrdiff_t offset)
1500 { _outp = node->_out + offset; DEBUG_ONLY(sample(node)); }
1501
1502 public:
1503 // initialize to garbage; clear _vdui to disable asserts
1504 DUIterator_Fast()
1505 { /*initialize to garbage*/ DEBUG_ONLY(_vdui = false); }
1506
1507 DUIterator_Fast(const DUIterator_Fast& that)
1508 { _outp = that._outp; DEBUG_ONLY(_vdui = false; reset(that)); }
1509
1510 void operator++(int dummy_to_specify_postfix_op)
1511 { _outp++; VDUI_ONLY(verify(_node, true)); }
1512
1513 void operator--()
1514 { VDUI_ONLY(verify_resync()); --_outp; }
1515
1516 void operator-=(uint n) // applied to the limit only
1517 { _outp -= n; VDUI_ONLY(verify_relimit(n)); }
1518
1519 bool operator<(DUIterator_Fast& limit) {
1520 I_VDUI_ONLY(*this, this->verify(_node, true));
1521 I_VDUI_ONLY(limit, limit.verify_limit());
1522 return _outp < limit._outp;
1523 }
1524
1525 void operator=(const DUIterator_Fast& that)
1526 { _outp = that._outp; DEBUG_ONLY(reset(that)); }
1527 };
1528
1529 DUIterator_Fast Node::fast_outs(DUIterator_Fast& imax) const {
1530 // Assign a limit pointer to the reference argument:
1531 imax = DUIterator_Fast(this, (ptrdiff_t)_outcnt);
1532 // Return the base pointer:
1533 return DUIterator_Fast(this, 0);
1534 }
1535 Node* Node::fast_out(DUIterator_Fast& i) const {
1536 I_VDUI_ONLY(i, i.verify(this));
1537 return DEBUG_ONLY(i._last=) *i._outp;
1538 }
1539
1540
1541 // Faster DU iterator. Requires each successive edge to be removed.
1542 // Does not allow insertion of any edges.
1543 // Usage:
1544 // for (DUIterator_Last imin, i = x->last_outs(imin); i >= imin; i -= num_edges) {
1545 // Node* y = x->last_out(i);
1546 // ...
1547 // }
1548 // Compiles in product mode to raw Node** pointer arithmetic, with
1549 // no reloading of pointers from the original node x.
1550 class DUIterator_Last : private DUIterator_Fast {
1551 friend class Node;
1552
1553 #ifdef ASSERT
1554 void verify(const Node* node, bool at_end_ok = false);
1555 void verify_limit();
1556 void verify_step(uint num_edges);
1557 #endif
1558
1559 // Note: offset must be signed, since -1 is sometimes passed
1560 DUIterator_Last(const Node* node, ptrdiff_t offset)
1561 : DUIterator_Fast(node, offset) { }
1562
1563 void operator++(int dummy_to_specify_postfix_op) {} // do not use
1564 void operator<(int) {} // do not use
1565
1566 public:
1567 DUIterator_Last() { }
1568 // initialize to garbage
1569
1570 DUIterator_Last(const DUIterator_Last& that) = default;
1571
1572 void operator--()
1573 { _outp--; VDUI_ONLY(verify_step(1)); }
1574
1575 void operator-=(uint n)
1576 { _outp -= n; VDUI_ONLY(verify_step(n)); }
1577
1578 bool operator>=(DUIterator_Last& limit) {
1579 I_VDUI_ONLY(*this, this->verify(_node, true));
1580 I_VDUI_ONLY(limit, limit.verify_limit());
1581 return _outp >= limit._outp;
1582 }
1583
1584 DUIterator_Last& operator=(const DUIterator_Last& that) = default;
1585 };
1586
1587 DUIterator_Last Node::last_outs(DUIterator_Last& imin) const {
1588 // Assign a limit pointer to the reference argument:
1589 imin = DUIterator_Last(this, 0);
1590 // Return the initial pointer:
1591 return DUIterator_Last(this, (ptrdiff_t)_outcnt - 1);
1592 }
1593 Node* Node::last_out(DUIterator_Last& i) const {
1594 I_VDUI_ONLY(i, i.verify(this));
1595 return DEBUG_ONLY(i._last=) *i._outp;
1596 }
1597
1598 #endif //OPTO_DU_ITERATOR_ASSERT
1599
1600 #undef I_VDUI_ONLY
1601 #undef VDUI_ONLY
1602
1603 // An Iterator that truly follows the iterator pattern. Doesn't
1604 // support deletion but could be made to.
1605 //
1606 // for (SimpleDUIterator i(n); i.has_next(); i.next()) {
1607 // Node* m = i.get();
1608 //
1609 class SimpleDUIterator : public StackObj {
1610 private:
1611 Node* node;
1612 DUIterator_Fast imax;
1613 DUIterator_Fast i;
1614 public:
1615 SimpleDUIterator(Node* n): node(n), i(n->fast_outs(imax)) {}
1616 bool has_next() { return i < imax; }
1617 void next() { i++; }
1618 Node* get() { return node->fast_out(i); }
1619 };
1620
1621
1622 //-----------------------------------------------------------------------------
1623 // Map dense integer indices to Nodes. Uses classic doubling-array trick.
1624 // Abstractly provides an infinite array of Node*'s, initialized to null.
1625 // Note that the constructor just zeros things, and since I use Arena
1626 // allocation I do not need a destructor to reclaim storage.
1627 class Node_Array : public AnyObj {
1628 protected:
1629 Arena* _a; // Arena to allocate in
1630 uint _max;
1631 Node** _nodes;
1632 ReallocMark _nesting; // Safety checks for arena reallocation
1633
1634 // Grow array to required capacity
1635 void maybe_grow(uint i) {
1636 _nesting.check(_a); // Check if a potential reallocation in the arena is safe
1637 if (i >= _max) {
1638 grow(i);
1639 }
1640 }
1641 void grow(uint i);
1642
1643 public:
1644 Node_Array(Arena* a, uint max = OptoNodeListSize) : _a(a), _max(max) {
1645 _nodes = NEW_ARENA_ARRAY(a, Node*, max);
1646 clear();
1647 }
1648 Node_Array() : Node_Array(Thread::current()->resource_area()) {}
1649
1650 NONCOPYABLE(Node_Array);
1651 Node_Array& operator=(Node_Array&&) = delete;
1652 // Allow move constructor for && (eg. capture return of function)
1653 Node_Array(Node_Array&&) = default;
1654
1655 Node *operator[] ( uint i ) const // Lookup, or null for not mapped
1656 { return (i<_max) ? _nodes[i] : (Node*)nullptr; }
1657 Node* at(uint i) const { assert(i<_max,"oob"); return _nodes[i]; }
1658 Node** adr() { return _nodes; }
1659 // Extend the mapping: index i maps to Node *n.
1660 void map( uint i, Node *n ) { maybe_grow(i); _nodes[i] = n; }
1661 void insert( uint i, Node *n );
1662 void remove( uint i ); // Remove, preserving order
1663 // Clear all entries in _nodes to null but keep storage
1664 void clear() {
1665 Copy::zero_to_bytes(_nodes, _max * sizeof(Node*));
1666 }
1667
1668 uint max() const { return _max; }
1669 void dump() const;
1670 };
1671
1672 class Node_List : public Node_Array {
1673 uint _cnt;
1674 public:
1675 Node_List(uint max = OptoNodeListSize) : Node_Array(Thread::current()->resource_area(), max), _cnt(0) {}
1676 Node_List(Arena *a, uint max = OptoNodeListSize) : Node_Array(a, max), _cnt(0) {}
1677
1678 NONCOPYABLE(Node_List);
1679 Node_List& operator=(Node_List&&) = delete;
1680 // Allow move constructor for && (eg. capture return of function)
1681 Node_List(Node_List&&) = default;
1682
1683 bool contains(const Node* n) const {
1684 for (uint e = 0; e < size(); e++) {
1685 if (at(e) == n) return true;
1686 }
1687 return false;
1688 }
1689 void insert( uint i, Node *n ) { Node_Array::insert(i,n); _cnt++; }
1690 void remove( uint i ) { Node_Array::remove(i); _cnt--; }
1691 void push( Node *b ) { map(_cnt++,b); }
1692 void yank( Node *n ); // Find and remove
1693 Node *pop() { return _nodes[--_cnt]; }
1694 void clear() { _cnt = 0; Node_Array::clear(); } // retain storage
1695 void copy(const Node_List& from) {
1696 if (from._max > _max) {
1697 grow(from._max);
1698 }
1699 _cnt = from._cnt;
1700 Copy::conjoint_words_to_higher((HeapWord*)&from._nodes[0], (HeapWord*)&_nodes[0], from._max * sizeof(Node*));
1701 }
1702
1703 uint size() const { return _cnt; }
1704 void dump() const;
1705 void dump_simple() const;
1706 };
1707
1708 // Definition must appear after complete type definition of Node_List
1709 template <typename Callback, typename Check>
1710 void Node::visit_uses(Callback callback, Check is_boundary) const {
1711 ResourceMark rm;
1712 VectorSet visited;
1713 Node_List worklist;
1714
1715 // The initial worklist consists of the direct uses
1716 for (DUIterator_Fast kmax, k = fast_outs(kmax); k < kmax; k++) {
1717 Node* out = fast_out(k);
1718 if (!visited.test_set(out->_idx)) { worklist.push(out); }
1719 }
1720
1721 while (worklist.size() > 0) {
1722 Node* use = worklist.pop();
1723 // Apply callback on boundary nodes
1724 if (is_boundary(use)) {
1725 callback(use);
1726 } else {
1727 // Not a boundary node, continue search
1728 for (DUIterator_Fast kmax, k = use->fast_outs(kmax); k < kmax; k++) {
1729 Node* out = use->fast_out(k);
1730 if (!visited.test_set(out->_idx)) { worklist.push(out); }
1731 }
1732 }
1733 }
1734 }
1735
1736
1737 //------------------------------Unique_Node_List-------------------------------
1738 class Unique_Node_List : public Node_List {
1739 VectorSet _in_worklist;
1740 uint _clock_index; // Index in list where to pop from next
1741 public:
1742 Unique_Node_List() : Node_List(), _clock_index(0) {}
1743 Unique_Node_List(Arena *a) : Node_List(a), _in_worklist(a), _clock_index(0) {}
1744
1745 NONCOPYABLE(Unique_Node_List);
1746 Unique_Node_List& operator=(Unique_Node_List&&) = delete;
1747 // Allow move constructor for && (eg. capture return of function)
1748 Unique_Node_List(Unique_Node_List&&) = default;
1749
1750 void remove( Node *n );
1751 bool member(const Node* n) const { return _in_worklist.test(n->_idx) != 0; }
1752 VectorSet& member_set(){ return _in_worklist; }
1753
1754 void push(Node* b) {
1755 if( !_in_worklist.test_set(b->_idx) )
1756 Node_List::push(b);
1757 }
1758 void push_non_cfg_inputs_of(const Node* node) {
1759 for (uint i = 1; i < node->req(); i++) {
1760 Node* input = node->in(i);
1761 if (input != nullptr && !input->is_CFG()) {
1762 push(input);
1763 }
1764 }
1765 }
1766
1767 void push_outputs_of(const Node* node) {
1768 for (DUIterator_Fast imax, i = node->fast_outs(imax); i < imax; i++) {
1769 Node* output = node->fast_out(i);
1770 push(output);
1771 }
1772 }
1773
1774 Node *pop() {
1775 if( _clock_index >= size() ) _clock_index = 0;
1776 Node *b = at(_clock_index);
1777 map( _clock_index, Node_List::pop());
1778 if (size() != 0) _clock_index++; // Always start from 0
1779 _in_worklist.remove(b->_idx);
1780 return b;
1781 }
1782 Node *remove(uint i) {
1783 Node *b = Node_List::at(i);
1784 _in_worklist.remove(b->_idx);
1785 map(i,Node_List::pop());
1786 return b;
1787 }
1788 void yank(Node *n) {
1789 _in_worklist.remove(n->_idx);
1790 Node_List::yank(n);
1791 }
1792 void clear() {
1793 _in_worklist.clear(); // Discards storage but grows automatically
1794 Node_List::clear();
1795 _clock_index = 0;
1796 }
1797 void ensure_empty() {
1798 assert(size() == 0, "must be empty");
1799 clear(); // just in case
1800 }
1801
1802 // Used after parsing to remove useless nodes before Iterative GVN
1803 void remove_useless_nodes(VectorSet& useful);
1804
1805 // If the idx of the Nodes change, we must recompute the VectorSet
1806 void recompute_idx_set() {
1807 _in_worklist.clear();
1808 for (uint i = 0; i < size(); i++) {
1809 Node* n = at(i);
1810 _in_worklist.set(n->_idx);
1811 }
1812 }
1813
1814 #ifdef ASSERT
1815 bool is_subset_of(Unique_Node_List& other) {
1816 for (uint i = 0; i < size(); i++) {
1817 Node* n = at(i);
1818 if (!other.member(n)) {
1819 return false;
1820 }
1821 }
1822 return true;
1823 }
1824 #endif
1825
1826 bool contains(const Node* n) const {
1827 fatal("use faster member() instead");
1828 return false;
1829 }
1830
1831 #ifndef PRODUCT
1832 void print_set() const { _in_worklist.print(); }
1833 #endif
1834 };
1835
1836 // Unique_Mixed_Node_List
1837 // unique: nodes are added only once
1838 // mixed: allow new and old nodes
1839 class Unique_Mixed_Node_List : public ResourceObj {
1840 public:
1841 Unique_Mixed_Node_List() : _visited_set(cmpkey, hashkey) {}
1842
1843 void add(Node* node) {
1844 if (not_a_node(node)) {
1845 return; // Gracefully handle null, -1, 0xabababab, etc.
1846 }
1847 if (_visited_set[node] == nullptr) {
1848 _visited_set.Insert(node, node);
1849 _worklist.push(node);
1850 }
1851 }
1852
1853 Node* operator[] (uint i) const {
1854 return _worklist[i];
1855 }
1856
1857 size_t size() {
1858 return _worklist.size();
1859 }
1860
1861 private:
1862 Dict _visited_set;
1863 Node_List _worklist;
1864 };
1865
1866 // Inline definition of Compile::record_for_igvn must be deferred to this point.
1867 inline void Compile::record_for_igvn(Node* n) {
1868 _igvn_worklist->push(n);
1869 }
1870
1871 // Inline definition of Compile::remove_for_igvn must be deferred to this point.
1872 inline void Compile::remove_for_igvn(Node* n) {
1873 _igvn_worklist->remove(n);
1874 }
1875
1876 //------------------------------Node_Stack-------------------------------------
1877 class Node_Stack {
1878 protected:
1879 struct INode {
1880 Node *node; // Processed node
1881 uint indx; // Index of next node's child
1882 };
1883 INode *_inode_top; // tos, stack grows up
1884 INode *_inode_max; // End of _inodes == _inodes + _max
1885 INode *_inodes; // Array storage for the stack
1886 Arena *_a; // Arena to allocate in
1887 ReallocMark _nesting; // Safety checks for arena reallocation
1888
1889 void maybe_grow() {
1890 _nesting.check(_a); // Check if a potential reallocation in the arena is safe
1891 if (_inode_top >= _inode_max) {
1892 grow();
1893 }
1894 }
1895 void grow();
1896
1897 public:
1898 Node_Stack(int size) {
1899 size_t max = (size > OptoNodeListSize) ? size : OptoNodeListSize;
1900 _a = Thread::current()->resource_area();
1901 _inodes = NEW_ARENA_ARRAY( _a, INode, max );
1902 _inode_max = _inodes + max;
1903 _inode_top = _inodes - 1; // stack is empty
1904 }
1905
1906 Node_Stack(Arena *a, int size) : _a(a) {
1907 size_t max = (size > OptoNodeListSize) ? size : OptoNodeListSize;
1908 _inodes = NEW_ARENA_ARRAY( _a, INode, max );
1909 _inode_max = _inodes + max;
1910 _inode_top = _inodes - 1; // stack is empty
1911 }
1912
1913 void pop() {
1914 assert(_inode_top >= _inodes, "node stack underflow");
1915 --_inode_top;
1916 }
1917 void push(Node *n, uint i) {
1918 ++_inode_top;
1919 maybe_grow();
1920 INode *top = _inode_top; // optimization
1921 top->node = n;
1922 top->indx = i;
1923 }
1924 Node *node() const {
1925 return _inode_top->node;
1926 }
1927 Node* node_at(uint i) const {
1928 assert(_inodes + i <= _inode_top, "in range");
1929 return _inodes[i].node;
1930 }
1931 uint index() const {
1932 return _inode_top->indx;
1933 }
1934 uint index_at(uint i) const {
1935 assert(_inodes + i <= _inode_top, "in range");
1936 return _inodes[i].indx;
1937 }
1938 void set_node(Node *n) {
1939 _inode_top->node = n;
1940 }
1941 void set_index(uint i) {
1942 _inode_top->indx = i;
1943 }
1944 uint size_max() const { return (uint)pointer_delta(_inode_max, _inodes, sizeof(INode)); } // Max size
1945 uint size() const { return (uint)pointer_delta((_inode_top+1), _inodes, sizeof(INode)); } // Current size
1946 bool is_nonempty() const { return (_inode_top >= _inodes); }
1947 bool is_empty() const { return (_inode_top < _inodes); }
1948 void clear() { _inode_top = _inodes - 1; } // retain storage
1949
1950 // Node_Stack is used to map nodes.
1951 Node* find(uint idx) const;
1952
1953 NONCOPYABLE(Node_Stack);
1954 };
1955
1956
1957 //-----------------------------Node_Notes--------------------------------------
1958 // Debugging or profiling annotations loosely and sparsely associated
1959 // with some nodes. See Compile::node_notes_at for the accessor.
1960 class Node_Notes {
1961 JVMState* _jvms;
1962
1963 public:
1964 Node_Notes(JVMState* jvms = nullptr) {
1965 _jvms = jvms;
1966 }
1967
1968 JVMState* jvms() { return _jvms; }
1969 void set_jvms(JVMState* x) { _jvms = x; }
1970
1971 // True if there is nothing here.
1972 bool is_clear() {
1973 return (_jvms == nullptr);
1974 }
1975
1976 // Make there be nothing here.
1977 void clear() {
1978 _jvms = nullptr;
1979 }
1980
1981 // Make a new, clean node notes.
1982 static Node_Notes* make(Compile* C) {
1983 Node_Notes* nn = NEW_ARENA_ARRAY(C->comp_arena(), Node_Notes, 1);
1984 nn->clear();
1985 return nn;
1986 }
1987
1988 Node_Notes* clone(Compile* C) {
1989 Node_Notes* nn = NEW_ARENA_ARRAY(C->comp_arena(), Node_Notes, 1);
1990 (*nn) = (*this);
1991 return nn;
1992 }
1993
1994 // Absorb any information from source.
1995 bool update_from(Node_Notes* source) {
1996 bool changed = false;
1997 if (source != nullptr) {
1998 if (source->jvms() != nullptr) {
1999 set_jvms(source->jvms());
2000 changed = true;
2001 }
2002 }
2003 return changed;
2004 }
2005 };
2006
2007 // Inlined accessors for Compile::node_nodes that require the preceding class:
2008 inline Node_Notes*
2009 Compile::locate_node_notes(GrowableArray<Node_Notes*>* arr,
2010 int idx, bool can_grow) {
2011 assert(idx >= 0, "oob");
2012 int block_idx = (idx >> _log2_node_notes_block_size);
2013 int grow_by = (block_idx - (arr == nullptr? 0: arr->length()));
2014 if (grow_by >= 0) {
2015 if (!can_grow) return nullptr;
2016 grow_node_notes(arr, grow_by + 1);
2017 }
2018 if (arr == nullptr) return nullptr;
2019 // (Every element of arr is a sub-array of length _node_notes_block_size.)
2020 return arr->at(block_idx) + (idx & (_node_notes_block_size-1));
2021 }
2022
2023 inline Node_Notes* Compile::node_notes_at(int idx) {
2024 return locate_node_notes(_node_note_array, idx, false);
2025 }
2026
2027 inline bool
2028 Compile::set_node_notes_at(int idx, Node_Notes* value) {
2029 if (value == nullptr || value->is_clear())
2030 return false; // nothing to write => write nothing
2031 Node_Notes* loc = locate_node_notes(_node_note_array, idx, true);
2032 assert(loc != nullptr, "");
2033 return loc->update_from(value);
2034 }
2035
2036
2037 //------------------------------TypeNode---------------------------------------
2038 // Node with a Type constant.
2039 class TypeNode : public Node {
2040 protected:
2041 virtual uint hash() const; // Check the type
2042 virtual bool cmp( const Node &n ) const;
2043 virtual uint size_of() const; // Size is bigger
2044 const Type* const _type;
2045 public:
2046 void set_type(const Type* t) {
2047 assert(t != nullptr, "sanity");
2048 DEBUG_ONLY(uint check_hash = (VerifyHashTableKeys && _hash_lock) ? hash() : NO_HASH);
2049 *(const Type**)&_type = t; // cast away const-ness
2050 // If this node is in the hash table, make sure it doesn't need a rehash.
2051 assert(check_hash == NO_HASH || check_hash == hash(), "type change must preserve hash code");
2052 }
2053 const Type* type() const { assert(_type != nullptr, "sanity"); return _type; };
2054 TypeNode( const Type *t, uint required ) : Node(required), _type(t) {
2055 init_class_id(Class_Type);
2056 }
2057 virtual const Type* Value(PhaseGVN* phase) const;
2058 virtual Node* Ideal(PhaseGVN* phase, bool can_reshape);
2059 virtual const Type *bottom_type() const;
2060 virtual uint ideal_reg() const;
2061
2062 void make_path_dead(PhaseIterGVN* igvn, PhaseIdealLoop* loop, Node* ctrl_use, uint j, const char* phase_str);
2063 #ifndef PRODUCT
2064 virtual void dump_spec(outputStream *st) const;
2065 virtual void dump_compact_spec(outputStream *st) const;
2066 #endif
2067 void make_paths_from_here_dead(PhaseIterGVN* igvn, PhaseIdealLoop* loop, const char* phase_str);
2068 void create_halt_path(PhaseIterGVN* igvn, Node* c, PhaseIdealLoop* loop, const char* phase_str) const;
2069 };
2070
2071 #include "opto/opcodes.hpp"
2072
2073 #define Op_IL(op) \
2074 inline int Op_ ## op(BasicType bt) { \
2075 assert(bt == T_INT || bt == T_LONG, "only for int or longs"); \
2076 if (bt == T_INT) { \
2077 return Op_## op ## I; \
2078 } \
2079 return Op_## op ## L; \
2080 }
2081
2082 Op_IL(Add)
2083 Op_IL(And)
2084 Op_IL(Sub)
2085 Op_IL(Mul)
2086 Op_IL(URShift)
2087 Op_IL(LShift)
2088 Op_IL(Xor)
2089 Op_IL(Cmp)
2090 Op_IL(Div)
2091 Op_IL(Mod)
2092 Op_IL(UDiv)
2093 Op_IL(UMod)
2094
2095 inline int Op_ConIL(BasicType bt) {
2096 assert(bt == T_INT || bt == T_LONG, "only for int or longs");
2097 if (bt == T_INT) {
2098 return Op_ConI;
2099 }
2100 return Op_ConL;
2101 }
2102
2103 inline int Op_Cmp_unsigned(BasicType bt) {
2104 assert(bt == T_INT || bt == T_LONG, "only for int or longs");
2105 if (bt == T_INT) {
2106 return Op_CmpU;
2107 }
2108 return Op_CmpUL;
2109 }
2110
2111 inline int Op_Cast(BasicType bt) {
2112 assert(bt == T_INT || bt == T_LONG, "only for int or longs");
2113 if (bt == T_INT) {
2114 return Op_CastII;
2115 }
2116 return Op_CastLL;
2117 }
2118
2119 inline int Op_DivIL(BasicType bt, bool is_unsigned) {
2120 assert(bt == T_INT || bt == T_LONG, "only for int or longs");
2121 if (bt == T_INT) {
2122 if (is_unsigned) {
2123 return Op_UDivI;
2124 } else {
2125 return Op_DivI;
2126 }
2127 }
2128 if (is_unsigned) {
2129 return Op_UDivL;
2130 } else {
2131 return Op_DivL;
2132 }
2133 }
2134
2135 inline int Op_DivModIL(BasicType bt, bool is_unsigned) {
2136 assert(bt == T_INT || bt == T_LONG, "only for int or longs");
2137 if (bt == T_INT) {
2138 if (is_unsigned) {
2139 return Op_UDivModI;
2140 } else {
2141 return Op_DivModI;
2142 }
2143 }
2144 if (is_unsigned) {
2145 return Op_UDivModL;
2146 } else {
2147 return Op_DivModL;
2148 }
2149 }
2150
2151 // Interface to define actions that should be taken when running DataNodeBFS. Each use can extend this class to specify
2152 // a customized BFS.
2153 class BFSActions : public StackObj {
2154 public:
2155 // Should a node's inputs further be visited in the BFS traversal? By default, we visit all data inputs. Override this
2156 // method to provide a custom filter.
2157 virtual bool should_visit(Node* node) const {
2158 // By default, visit all inputs.
2159 return true;
2160 };
2161
2162 // Is the visited node a target node that we are looking for in the BFS traversal? We do not visit its inputs further
2163 // but the BFS will continue to visit all unvisited nodes in the queue.
2164 virtual bool is_target_node(Node* node) const = 0;
2165
2166 // Defines an action that should be taken when we visit a target node in the BFS traversal.
2167 virtual void target_node_action(Node* target_node) = 0;
2168 };
2169
2170 // Class to perform a BFS traversal on the data nodes from a given start node. The provided BFSActions guide which
2171 // data node's inputs should be further visited, which data nodes are target nodes and what to do with the target nodes.
2172 class DataNodeBFS : public StackObj {
2173 BFSActions& _bfs_actions;
2174
2175 public:
2176 explicit DataNodeBFS(BFSActions& bfs_action) : _bfs_actions(bfs_action) {}
2177
2178 // Run the BFS starting from 'start_node' and apply the actions provided to this class.
2179 void run(Node* start_node) {
2180 ResourceMark rm;
2181 Unique_Node_List _nodes_to_visit;
2182 _nodes_to_visit.push(start_node);
2183 for (uint i = 0; i < _nodes_to_visit.size(); i++) {
2184 Node* next = _nodes_to_visit[i];
2185 for (uint j = 1; j < next->req(); j++) {
2186 Node* input = next->in(j);
2187 if (_bfs_actions.is_target_node(input)) {
2188 assert(_bfs_actions.should_visit(input), "must also pass node filter");
2189 _bfs_actions.target_node_action(input);
2190 } else if (_bfs_actions.should_visit(input)) {
2191 _nodes_to_visit.push(input);
2192 }
2193 }
2194 }
2195 }
2196 };
2197
2198 #endif // SHARE_OPTO_NODE_HPP