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annotate src/share/vm/opto/node.hpp @ 17747:f99e331f6ef6
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Reviewed-by: brutisso, mgerdin, tschatzl
author | pliden |
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date | Fri, 10 Jan 2014 09:54:25 +0100 |
parents | 085b304a1cc5 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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 #ifndef SHARE_VM_OPTO_NODE_HPP |
26 #define SHARE_VM_OPTO_NODE_HPP | |
27 | |
28 #include "libadt/port.hpp" | |
29 #include "libadt/vectset.hpp" | |
30 #include "opto/compile.hpp" | |
31 #include "opto/type.hpp" | |
32 | |
0 | 33 // Portions of code courtesy of Clifford Click |
34 | |
35 // Optimization - Graph Style | |
36 | |
37 | |
38 class AbstractLockNode; | |
39 class AddNode; | |
40 class AddPNode; | |
41 class AliasInfo; | |
42 class AllocateArrayNode; | |
43 class AllocateNode; | |
44 class Block; | |
45 class BoolNode; | |
46 class BoxLockNode; | |
47 class CMoveNode; | |
48 class CallDynamicJavaNode; | |
49 class CallJavaNode; | |
50 class CallLeafNode; | |
51 class CallNode; | |
52 class CallRuntimeNode; | |
53 class CallStaticJavaNode; | |
54 class CatchNode; | |
55 class CatchProjNode; | |
56 class CheckCastPPNode; | |
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57 class ClearArrayNode; |
0 | 58 class CmpNode; |
59 class CodeBuffer; | |
60 class ConstraintCastNode; | |
61 class ConNode; | |
62 class CountedLoopNode; | |
63 class CountedLoopEndNode; | |
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64 class DecodeNarrowPtrNode; |
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65 class DecodeNNode; |
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66 class DecodeNKlassNode; |
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67 class EncodeNarrowPtrNode; |
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68 class EncodePNode; |
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69 class EncodePKlassNode; |
0 | 70 class FastLockNode; |
71 class FastUnlockNode; | |
72 class IfNode; | |
3842 | 73 class IfFalseNode; |
74 class IfTrueNode; | |
0 | 75 class InitializeNode; |
76 class JVMState; | |
77 class JumpNode; | |
78 class JumpProjNode; | |
79 class LoadNode; | |
80 class LoadStoreNode; | |
81 class LockNode; | |
82 class LoopNode; | |
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83 class MachBranchNode; |
0 | 84 class MachCallDynamicJavaNode; |
85 class MachCallJavaNode; | |
86 class MachCallLeafNode; | |
87 class MachCallNode; | |
88 class MachCallRuntimeNode; | |
89 class MachCallStaticJavaNode; | |
2008 | 90 class MachConstantBaseNode; |
91 class MachConstantNode; | |
3842 | 92 class MachGotoNode; |
0 | 93 class MachIfNode; |
94 class MachNode; | |
95 class MachNullCheckNode; | |
3842 | 96 class MachProjNode; |
0 | 97 class MachReturnNode; |
98 class MachSafePointNode; | |
99 class MachSpillCopyNode; | |
100 class MachTempNode; | |
101 class Matcher; | |
102 class MemBarNode; | |
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103 class MemBarStoreStoreNode; |
0 | 104 class MemNode; |
105 class MergeMemNode; | |
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106 class MulNode; |
0 | 107 class MultiNode; |
108 class MultiBranchNode; | |
109 class NeverBranchNode; | |
110 class Node; | |
111 class Node_Array; | |
112 class Node_List; | |
113 class Node_Stack; | |
114 class NullCheckNode; | |
115 class OopMap; | |
33 | 116 class ParmNode; |
0 | 117 class PCTableNode; |
118 class PhaseCCP; | |
119 class PhaseGVN; | |
120 class PhaseIterGVN; | |
121 class PhaseRegAlloc; | |
122 class PhaseTransform; | |
123 class PhaseValues; | |
124 class PhiNode; | |
125 class Pipeline; | |
126 class ProjNode; | |
127 class RegMask; | |
128 class RegionNode; | |
129 class RootNode; | |
130 class SafePointNode; | |
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131 class SafePointScalarObjectNode; |
0 | 132 class StartNode; |
133 class State; | |
134 class StoreNode; | |
135 class SubNode; | |
136 class Type; | |
137 class TypeNode; | |
138 class UnlockNode; | |
3842 | 139 class VectorNode; |
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140 class LoadVectorNode; |
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141 class StoreVectorNode; |
0 | 142 class VectorSet; |
143 typedef void (*NFunc)(Node&,void*); | |
144 extern "C" { | |
145 typedef int (*C_sort_func_t)(const void *, const void *); | |
146 } | |
147 | |
148 // The type of all node counts and indexes. | |
149 // It must hold at least 16 bits, but must also be fast to load and store. | |
150 // This type, if less than 32 bits, could limit the number of possible nodes. | |
151 // (To make this type platform-specific, move to globalDefinitions_xxx.hpp.) | |
152 typedef unsigned int node_idx_t; | |
153 | |
154 | |
155 #ifndef OPTO_DU_ITERATOR_ASSERT | |
156 #ifdef ASSERT | |
157 #define OPTO_DU_ITERATOR_ASSERT 1 | |
158 #else | |
159 #define OPTO_DU_ITERATOR_ASSERT 0 | |
160 #endif | |
161 #endif //OPTO_DU_ITERATOR_ASSERT | |
162 | |
163 #if OPTO_DU_ITERATOR_ASSERT | |
164 class DUIterator; | |
165 class DUIterator_Fast; | |
166 class DUIterator_Last; | |
167 #else | |
168 typedef uint DUIterator; | |
169 typedef Node** DUIterator_Fast; | |
170 typedef Node** DUIterator_Last; | |
171 #endif | |
172 | |
173 // Node Sentinel | |
174 #define NodeSentinel (Node*)-1 | |
175 | |
176 // Unknown count frequency | |
177 #define COUNT_UNKNOWN (-1.0f) | |
178 | |
179 //------------------------------Node------------------------------------------- | |
180 // Nodes define actions in the program. They create values, which have types. | |
181 // They are both vertices in a directed graph and program primitives. Nodes | |
182 // are labeled; the label is the "opcode", the primitive function in the lambda | |
183 // calculus sense that gives meaning to the Node. Node inputs are ordered (so | |
184 // that "a-b" is different from "b-a"). The inputs to a Node are the inputs to | |
185 // the Node's function. These inputs also define a Type equation for the Node. | |
186 // Solving these Type equations amounts to doing dataflow analysis. | |
187 // Control and data are uniformly represented in the graph. Finally, Nodes | |
188 // have a unique dense integer index which is used to index into side arrays | |
189 // whenever I have phase-specific information. | |
190 | |
191 class Node { | |
3939 | 192 friend class VMStructs; |
193 | |
0 | 194 // Lots of restrictions on cloning Nodes |
195 Node(const Node&); // not defined; linker error to use these | |
196 Node &operator=(const Node &rhs); | |
197 | |
198 public: | |
199 friend class Compile; | |
200 #if OPTO_DU_ITERATOR_ASSERT | |
201 friend class DUIterator_Common; | |
202 friend class DUIterator; | |
203 friend class DUIterator_Fast; | |
204 friend class DUIterator_Last; | |
205 #endif | |
206 | |
207 // Because Nodes come and go, I define an Arena of Node structures to pull | |
208 // from. This should allow fast access to node creation & deletion. This | |
209 // field is a local cache of a value defined in some "program fragment" for | |
210 // which these Nodes are just a part of. | |
211 | |
212 // New Operator that takes a Compile pointer, this will eventually | |
213 // be the "new" New operator. | |
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214 inline void* operator new( size_t x, Compile* C) throw() { |
0 | 215 Node* n = (Node*)C->node_arena()->Amalloc_D(x); |
216 #ifdef ASSERT | |
217 n->_in = (Node**)n; // magic cookie for assertion check | |
218 #endif | |
219 n->_out = (Node**)C; | |
220 return (void*)n; | |
221 } | |
222 | |
223 // Delete is a NOP | |
224 void operator delete( void *ptr ) {} | |
225 // Fancy destructor; eagerly attempt to reclaim Node numberings and storage | |
226 void destruct(); | |
227 | |
228 // Create a new Node. Required is the number is of inputs required for | |
229 // semantic correctness. | |
230 Node( uint required ); | |
231 | |
232 // Create a new Node with given input edges. | |
233 // This version requires use of the "edge-count" new. | |
234 // E.g. new (C,3) FooNode( C, NULL, left, right ); | |
235 Node( Node *n0 ); | |
236 Node( Node *n0, Node *n1 ); | |
237 Node( Node *n0, Node *n1, Node *n2 ); | |
238 Node( Node *n0, Node *n1, Node *n2, Node *n3 ); | |
239 Node( Node *n0, Node *n1, Node *n2, Node *n3, Node *n4 ); | |
240 Node( Node *n0, Node *n1, Node *n2, Node *n3, Node *n4, Node *n5 ); | |
241 Node( Node *n0, Node *n1, Node *n2, Node *n3, | |
242 Node *n4, Node *n5, Node *n6 ); | |
243 | |
244 // Clone an inherited Node given only the base Node type. | |
245 Node* clone() const; | |
246 | |
247 // Clone a Node, immediately supplying one or two new edges. | |
248 // The first and second arguments, if non-null, replace in(1) and in(2), | |
249 // respectively. | |
250 Node* clone_with_data_edge(Node* in1, Node* in2 = NULL) const { | |
251 Node* nn = clone(); | |
252 if (in1 != NULL) nn->set_req(1, in1); | |
253 if (in2 != NULL) nn->set_req(2, in2); | |
254 return nn; | |
255 } | |
256 | |
257 private: | |
258 // Shared setup for the above constructors. | |
259 // Handles all interactions with Compile::current. | |
260 // Puts initial values in all Node fields except _idx. | |
261 // Returns the initial value for _idx, which cannot | |
262 // be initialized by assignment. | |
263 inline int Init(int req, Compile* C); | |
264 | |
265 //----------------- input edge handling | |
266 protected: | |
267 friend class PhaseCFG; // Access to address of _in array elements | |
268 Node **_in; // Array of use-def references to Nodes | |
269 Node **_out; // Array of def-use references to Nodes | |
270 | |
605 | 271 // Input edges are split into two categories. Required edges are required |
0 | 272 // for semantic correctness; order is important and NULLs are allowed. |
273 // Precedence edges are used to help determine execution order and are | |
274 // added, e.g., for scheduling purposes. They are unordered and not | |
275 // duplicated; they have no embedded NULLs. Edges from 0 to _cnt-1 | |
276 // are required, from _cnt to _max-1 are precedence edges. | |
277 node_idx_t _cnt; // Total number of required Node inputs. | |
278 | |
279 node_idx_t _max; // Actual length of input array. | |
280 | |
281 // Output edges are an unordered list of def-use edges which exactly | |
282 // correspond to required input edges which point from other nodes | |
283 // to this one. Thus the count of the output edges is the number of | |
284 // users of this node. | |
285 node_idx_t _outcnt; // Total number of Node outputs. | |
286 | |
287 node_idx_t _outmax; // Actual length of output array. | |
288 | |
289 // Grow the actual input array to the next larger power-of-2 bigger than len. | |
290 void grow( uint len ); | |
291 // Grow the output array to the next larger power-of-2 bigger than len. | |
292 void out_grow( uint len ); | |
293 | |
294 public: | |
295 // Each Node is assigned a unique small/dense number. This number is used | |
296 // to index into auxiliary arrays of data and bitvectors. | |
297 // It is declared const to defend against inadvertant assignment, | |
298 // since it is used by clients as a naked field. | |
299 const node_idx_t _idx; | |
300 | |
301 // Get the (read-only) number of input edges | |
302 uint req() const { return _cnt; } | |
303 uint len() const { return _max; } | |
304 // Get the (read-only) number of output edges | |
305 uint outcnt() const { return _outcnt; } | |
306 | |
307 #if OPTO_DU_ITERATOR_ASSERT | |
308 // Iterate over the out-edges of this node. Deletions are illegal. | |
309 inline DUIterator outs() const; | |
310 // Use this when the out array might have changed to suppress asserts. | |
311 inline DUIterator& refresh_out_pos(DUIterator& i) const; | |
312 // Does the node have an out at this position? (Used for iteration.) | |
313 inline bool has_out(DUIterator& i) const; | |
314 inline Node* out(DUIterator& i) const; | |
315 // Iterate over the out-edges of this node. All changes are illegal. | |
316 inline DUIterator_Fast fast_outs(DUIterator_Fast& max) const; | |
317 inline Node* fast_out(DUIterator_Fast& i) const; | |
318 // Iterate over the out-edges of this node, deleting one at a time. | |
319 inline DUIterator_Last last_outs(DUIterator_Last& min) const; | |
320 inline Node* last_out(DUIterator_Last& i) const; | |
321 // The inline bodies of all these methods are after the iterator definitions. | |
322 #else | |
323 // Iterate over the out-edges of this node. Deletions are illegal. | |
324 // This iteration uses integral indexes, to decouple from array reallocations. | |
325 DUIterator outs() const { return 0; } | |
326 // Use this when the out array might have changed to suppress asserts. | |
327 DUIterator refresh_out_pos(DUIterator i) const { return i; } | |
328 | |
329 // Reference to the i'th output Node. Error if out of bounds. | |
330 Node* out(DUIterator i) const { assert(i < _outcnt, "oob"); return _out[i]; } | |
331 // Does the node have an out at this position? (Used for iteration.) | |
332 bool has_out(DUIterator i) const { return i < _outcnt; } | |
333 | |
334 // Iterate over the out-edges of this node. All changes are illegal. | |
335 // This iteration uses a pointer internal to the out array. | |
336 DUIterator_Fast fast_outs(DUIterator_Fast& max) const { | |
337 Node** out = _out; | |
338 // Assign a limit pointer to the reference argument: | |
339 max = out + (ptrdiff_t)_outcnt; | |
340 // Return the base pointer: | |
341 return out; | |
342 } | |
343 Node* fast_out(DUIterator_Fast i) const { return *i; } | |
344 // Iterate over the out-edges of this node, deleting one at a time. | |
345 // This iteration uses a pointer internal to the out array. | |
346 DUIterator_Last last_outs(DUIterator_Last& min) const { | |
347 Node** out = _out; | |
348 // Assign a limit pointer to the reference argument: | |
349 min = out; | |
350 // Return the pointer to the start of the iteration: | |
351 return out + (ptrdiff_t)_outcnt - 1; | |
352 } | |
353 Node* last_out(DUIterator_Last i) const { return *i; } | |
354 #endif | |
355 | |
356 // Reference to the i'th input Node. Error if out of bounds. | |
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357 Node* in(uint i) const { assert(i < _max, err_msg_res("oob: i=%d, _max=%d", i, _max)); return _in[i]; } |
0 | 358 // Reference to the i'th output Node. Error if out of bounds. |
359 // Use this accessor sparingly. We are going trying to use iterators instead. | |
360 Node* raw_out(uint i) const { assert(i < _outcnt,"oob"); return _out[i]; } | |
361 // Return the unique out edge. | |
362 Node* unique_out() const { assert(_outcnt==1,"not unique"); return _out[0]; } | |
363 // Delete out edge at position 'i' by moving last out edge to position 'i' | |
364 void raw_del_out(uint i) { | |
365 assert(i < _outcnt,"oob"); | |
366 assert(_outcnt > 0,"oob"); | |
367 #if OPTO_DU_ITERATOR_ASSERT | |
368 // Record that a change happened here. | |
369 debug_only(_last_del = _out[i]; ++_del_tick); | |
370 #endif | |
371 _out[i] = _out[--_outcnt]; | |
372 // Smash the old edge so it can't be used accidentally. | |
373 debug_only(_out[_outcnt] = (Node *)(uintptr_t)0xdeadbeef); | |
374 } | |
375 | |
376 #ifdef ASSERT | |
377 bool is_dead() const; | |
378 #define is_not_dead(n) ((n) == NULL || !VerifyIterativeGVN || !((n)->is_dead())) | |
379 #endif | |
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380 // Check whether node has become unreachable |
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381 bool is_unreachable(PhaseIterGVN &igvn) const; |
0 | 382 |
383 // Set a required input edge, also updates corresponding output edge | |
384 void add_req( Node *n ); // Append a NEW required input | |
385 void add_req_batch( Node* n, uint m ); // Append m NEW required inputs (all n). | |
386 void del_req( uint idx ); // Delete required edge & compact | |
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387 void del_req_ordered( uint idx ); // Delete required edge & compact with preserved order |
0 | 388 void ins_req( uint i, Node *n ); // Insert a NEW required input |
389 void set_req( uint i, Node *n ) { | |
390 assert( is_not_dead(n), "can not use dead node"); | |
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391 assert( i < _cnt, err_msg_res("oob: i=%d, _cnt=%d", i, _cnt)); |
0 | 392 assert( !VerifyHashTableKeys || _hash_lock == 0, |
393 "remove node from hash table before modifying it"); | |
394 Node** p = &_in[i]; // cache this._in, across the del_out call | |
395 if (*p != NULL) (*p)->del_out((Node *)this); | |
396 (*p) = n; | |
397 if (n != NULL) n->add_out((Node *)this); | |
398 } | |
399 // Light version of set_req() to init inputs after node creation. | |
400 void init_req( uint i, Node *n ) { | |
401 assert( i == 0 && this == n || | |
402 is_not_dead(n), "can not use dead node"); | |
403 assert( i < _cnt, "oob"); | |
404 assert( !VerifyHashTableKeys || _hash_lock == 0, | |
405 "remove node from hash table before modifying it"); | |
406 assert( _in[i] == NULL, "sanity"); | |
407 _in[i] = n; | |
408 if (n != NULL) n->add_out((Node *)this); | |
409 } | |
410 // Find first occurrence of n among my edges: | |
411 int find_edge(Node* n); | |
412 int replace_edge(Node* old, Node* neww); | |
10278 | 413 int replace_edges_in_range(Node* old, Node* neww, int start, int end); |
0 | 414 // NULL out all inputs to eliminate incoming Def-Use edges. |
415 // Return the number of edges between 'n' and 'this' | |
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416 int disconnect_inputs(Node *n, Compile *c); |
0 | 417 |
418 // Quickly, return true if and only if I am Compile::current()->top(). | |
419 bool is_top() const { | |
420 assert((this == (Node*) Compile::current()->top()) == (_out == NULL), ""); | |
421 return (_out == NULL); | |
422 } | |
423 // Reaffirm invariants for is_top. (Only from Compile::set_cached_top_node.) | |
424 void setup_is_top(); | |
425 | |
426 // Strip away casting. (It is depth-limited.) | |
427 Node* uncast() const; | |
4778 | 428 // Return whether two Nodes are equivalent, after stripping casting. |
429 bool eqv_uncast(const Node* n) const { | |
430 return (this->uncast() == n->uncast()); | |
431 } | |
0 | 432 |
433 private: | |
434 static Node* uncast_helper(const Node* n); | |
435 | |
436 // Add an output edge to the end of the list | |
437 void add_out( Node *n ) { | |
438 if (is_top()) return; | |
439 if( _outcnt == _outmax ) out_grow(_outcnt); | |
440 _out[_outcnt++] = n; | |
441 } | |
442 // Delete an output edge | |
443 void del_out( Node *n ) { | |
444 if (is_top()) return; | |
445 Node** outp = &_out[_outcnt]; | |
446 // Find and remove n | |
447 do { | |
448 assert(outp > _out, "Missing Def-Use edge"); | |
449 } while (*--outp != n); | |
450 *outp = _out[--_outcnt]; | |
451 // Smash the old edge so it can't be used accidentally. | |
452 debug_only(_out[_outcnt] = (Node *)(uintptr_t)0xdeadbeef); | |
453 // Record that a change happened here. | |
454 #if OPTO_DU_ITERATOR_ASSERT | |
455 debug_only(_last_del = n; ++_del_tick); | |
456 #endif | |
457 } | |
458 | |
459 public: | |
460 // Globally replace this node by a given new node, updating all uses. | |
461 void replace_by(Node* new_node); | |
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462 // Globally replace this node by a given new node, updating all uses |
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463 // and cutting input edges of old node. |
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464 void subsume_by(Node* new_node, Compile* c) { |
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465 replace_by(new_node); |
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466 disconnect_inputs(NULL, c); |
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467 } |
0 | 468 void set_req_X( uint i, Node *n, PhaseIterGVN *igvn ); |
469 // Find the one non-null required input. RegionNode only | |
470 Node *nonnull_req() const; | |
471 // Add or remove precedence edges | |
472 void add_prec( Node *n ); | |
473 void rm_prec( uint i ); | |
474 void set_prec( uint i, Node *n ) { | |
475 assert( is_not_dead(n), "can not use dead node"); | |
476 assert( i >= _cnt, "not a precedence edge"); | |
477 if (_in[i] != NULL) _in[i]->del_out((Node *)this); | |
478 _in[i] = n; | |
479 if (n != NULL) n->add_out((Node *)this); | |
480 } | |
481 // Set this node's index, used by cisc_version to replace current node | |
482 void set_idx(uint new_idx) { | |
483 const node_idx_t* ref = &_idx; | |
484 *(node_idx_t*)ref = new_idx; | |
485 } | |
486 // Swap input edge order. (Edge indexes i1 and i2 are usually 1 and 2.) | |
487 void swap_edges(uint i1, uint i2) { | |
488 debug_only(uint check_hash = (VerifyHashTableKeys && _hash_lock) ? hash() : NO_HASH); | |
489 // Def-Use info is unchanged | |
490 Node* n1 = in(i1); | |
491 Node* n2 = in(i2); | |
492 _in[i1] = n2; | |
493 _in[i2] = n1; | |
494 // If this node is in the hash table, make sure it doesn't need a rehash. | |
495 assert(check_hash == NO_HASH || check_hash == hash(), "edge swap must preserve hash code"); | |
496 } | |
497 | |
498 // Iterators over input Nodes for a Node X are written as: | |
499 // for( i = 0; i < X.req(); i++ ) ... X[i] ... | |
500 // NOTE: Required edges can contain embedded NULL pointers. | |
501 | |
502 //----------------- Other Node Properties | |
503 | |
504 // Generate class id for some ideal nodes to avoid virtual query | |
505 // methods is_<Node>(). | |
506 // Class id is the set of bits corresponded to the node class and all its | |
507 // super classes so that queries for super classes are also valid. | |
508 // Subclasses of the same super class have different assigned bit | |
509 // (the third parameter in the macro DEFINE_CLASS_ID). | |
510 // Classes with deeper hierarchy are declared first. | |
511 // Classes with the same hierarchy depth are sorted by usage frequency. | |
512 // | |
513 // The query method masks the bits to cut off bits of subclasses | |
514 // and then compare the result with the class id | |
515 // (see the macro DEFINE_CLASS_QUERY below). | |
516 // | |
517 // Class_MachCall=30, ClassMask_MachCall=31 | |
518 // 12 8 4 0 | |
519 // 0 0 0 0 0 0 0 0 1 1 1 1 0 | |
520 // | | | | | |
521 // | | | Bit_Mach=2 | |
522 // | | Bit_MachReturn=4 | |
523 // | Bit_MachSafePoint=8 | |
524 // Bit_MachCall=16 | |
525 // | |
526 // Class_CountedLoop=56, ClassMask_CountedLoop=63 | |
527 // 12 8 4 0 | |
528 // 0 0 0 0 0 0 0 1 1 1 0 0 0 | |
529 // | | | | |
530 // | | Bit_Region=8 | |
531 // | Bit_Loop=16 | |
532 // Bit_CountedLoop=32 | |
533 | |
534 #define DEFINE_CLASS_ID(cl, supcl, subn) \ | |
535 Bit_##cl = (Class_##supcl == 0) ? 1 << subn : (Bit_##supcl) << (1 + subn) , \ | |
536 Class_##cl = Class_##supcl + Bit_##cl , \ | |
537 ClassMask_##cl = ((Bit_##cl << 1) - 1) , | |
538 | |
539 // This enum is used only for C2 ideal and mach nodes with is_<node>() methods | |
540 // so that it's values fits into 16 bits. | |
541 enum NodeClasses { | |
542 Bit_Node = 0x0000, | |
543 Class_Node = 0x0000, | |
544 ClassMask_Node = 0xFFFF, | |
545 | |
546 DEFINE_CLASS_ID(Multi, Node, 0) | |
547 DEFINE_CLASS_ID(SafePoint, Multi, 0) | |
548 DEFINE_CLASS_ID(Call, SafePoint, 0) | |
549 DEFINE_CLASS_ID(CallJava, Call, 0) | |
550 DEFINE_CLASS_ID(CallStaticJava, CallJava, 0) | |
551 DEFINE_CLASS_ID(CallDynamicJava, CallJava, 1) | |
552 DEFINE_CLASS_ID(CallRuntime, Call, 1) | |
553 DEFINE_CLASS_ID(CallLeaf, CallRuntime, 0) | |
554 DEFINE_CLASS_ID(Allocate, Call, 2) | |
555 DEFINE_CLASS_ID(AllocateArray, Allocate, 0) | |
556 DEFINE_CLASS_ID(AbstractLock, Call, 3) | |
557 DEFINE_CLASS_ID(Lock, AbstractLock, 0) | |
558 DEFINE_CLASS_ID(Unlock, AbstractLock, 1) | |
559 DEFINE_CLASS_ID(MultiBranch, Multi, 1) | |
560 DEFINE_CLASS_ID(PCTable, MultiBranch, 0) | |
561 DEFINE_CLASS_ID(Catch, PCTable, 0) | |
562 DEFINE_CLASS_ID(Jump, PCTable, 1) | |
563 DEFINE_CLASS_ID(If, MultiBranch, 1) | |
564 DEFINE_CLASS_ID(CountedLoopEnd, If, 0) | |
565 DEFINE_CLASS_ID(NeverBranch, MultiBranch, 2) | |
566 DEFINE_CLASS_ID(Start, Multi, 2) | |
567 DEFINE_CLASS_ID(MemBar, Multi, 3) | |
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568 DEFINE_CLASS_ID(Initialize, MemBar, 0) |
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569 DEFINE_CLASS_ID(MemBarStoreStore, MemBar, 1) |
0 | 570 |
571 DEFINE_CLASS_ID(Mach, Node, 1) | |
572 DEFINE_CLASS_ID(MachReturn, Mach, 0) | |
573 DEFINE_CLASS_ID(MachSafePoint, MachReturn, 0) | |
574 DEFINE_CLASS_ID(MachCall, MachSafePoint, 0) | |
575 DEFINE_CLASS_ID(MachCallJava, MachCall, 0) | |
576 DEFINE_CLASS_ID(MachCallStaticJava, MachCallJava, 0) | |
577 DEFINE_CLASS_ID(MachCallDynamicJava, MachCallJava, 1) | |
578 DEFINE_CLASS_ID(MachCallRuntime, MachCall, 1) | |
579 DEFINE_CLASS_ID(MachCallLeaf, MachCallRuntime, 0) | |
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580 DEFINE_CLASS_ID(MachBranch, Mach, 1) |
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581 DEFINE_CLASS_ID(MachIf, MachBranch, 0) |
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582 DEFINE_CLASS_ID(MachGoto, MachBranch, 1) |
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583 DEFINE_CLASS_ID(MachNullCheck, MachBranch, 2) |
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584 DEFINE_CLASS_ID(MachSpillCopy, Mach, 2) |
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585 DEFINE_CLASS_ID(MachTemp, Mach, 3) |
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586 DEFINE_CLASS_ID(MachConstantBase, Mach, 4) |
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587 DEFINE_CLASS_ID(MachConstant, Mach, 5) |
0 | 588 |
3842 | 589 DEFINE_CLASS_ID(Type, Node, 2) |
0 | 590 DEFINE_CLASS_ID(Phi, Type, 0) |
591 DEFINE_CLASS_ID(ConstraintCast, Type, 1) | |
592 DEFINE_CLASS_ID(CheckCastPP, Type, 2) | |
593 DEFINE_CLASS_ID(CMove, Type, 3) | |
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594 DEFINE_CLASS_ID(SafePointScalarObject, Type, 4) |
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595 DEFINE_CLASS_ID(DecodeNarrowPtr, Type, 5) |
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596 DEFINE_CLASS_ID(DecodeN, DecodeNarrowPtr, 0) |
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597 DEFINE_CLASS_ID(DecodeNKlass, DecodeNarrowPtr, 1) |
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598 DEFINE_CLASS_ID(EncodeNarrowPtr, Type, 6) |
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599 DEFINE_CLASS_ID(EncodeP, EncodeNarrowPtr, 0) |
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600 DEFINE_CLASS_ID(EncodePKlass, EncodeNarrowPtr, 1) |
0 | 601 |
3842 | 602 DEFINE_CLASS_ID(Proj, Node, 3) |
603 DEFINE_CLASS_ID(CatchProj, Proj, 0) | |
604 DEFINE_CLASS_ID(JumpProj, Proj, 1) | |
605 DEFINE_CLASS_ID(IfTrue, Proj, 2) | |
606 DEFINE_CLASS_ID(IfFalse, Proj, 3) | |
607 DEFINE_CLASS_ID(Parm, Proj, 4) | |
608 DEFINE_CLASS_ID(MachProj, Proj, 5) | |
609 | |
610 DEFINE_CLASS_ID(Mem, Node, 4) | |
0 | 611 DEFINE_CLASS_ID(Load, Mem, 0) |
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612 DEFINE_CLASS_ID(LoadVector, Load, 0) |
0 | 613 DEFINE_CLASS_ID(Store, Mem, 1) |
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614 DEFINE_CLASS_ID(StoreVector, Store, 0) |
0 | 615 DEFINE_CLASS_ID(LoadStore, Mem, 2) |
616 | |
3842 | 617 DEFINE_CLASS_ID(Region, Node, 5) |
618 DEFINE_CLASS_ID(Loop, Region, 0) | |
619 DEFINE_CLASS_ID(Root, Loop, 0) | |
620 DEFINE_CLASS_ID(CountedLoop, Loop, 1) | |
621 | |
622 DEFINE_CLASS_ID(Sub, Node, 6) | |
623 DEFINE_CLASS_ID(Cmp, Sub, 0) | |
624 DEFINE_CLASS_ID(FastLock, Cmp, 0) | |
625 DEFINE_CLASS_ID(FastUnlock, Cmp, 1) | |
626 | |
0 | 627 DEFINE_CLASS_ID(MergeMem, Node, 7) |
628 DEFINE_CLASS_ID(Bool, Node, 8) | |
629 DEFINE_CLASS_ID(AddP, Node, 9) | |
630 DEFINE_CLASS_ID(BoxLock, Node, 10) | |
631 DEFINE_CLASS_ID(Add, Node, 11) | |
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632 DEFINE_CLASS_ID(Mul, Node, 12) |
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633 DEFINE_CLASS_ID(Vector, Node, 13) |
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634 DEFINE_CLASS_ID(ClearArray, Node, 14) |
0 | 635 |
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636 _max_classes = ClassMask_ClearArray |
0 | 637 }; |
638 #undef DEFINE_CLASS_ID | |
639 | |
640 // Flags are sorted by usage frequency. | |
641 enum NodeFlags { | |
642 Flag_is_Copy = 0x01, // should be first bit to avoid shift | |
3842 | 643 Flag_rematerialize = Flag_is_Copy << 1, |
0 | 644 Flag_needs_anti_dependence_check = Flag_rematerialize << 1, |
645 Flag_is_macro = Flag_needs_anti_dependence_check << 1, | |
646 Flag_is_Con = Flag_is_macro << 1, | |
647 Flag_is_cisc_alternate = Flag_is_Con << 1, | |
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648 Flag_is_dead_loop_safe = Flag_is_cisc_alternate << 1, |
0 | 649 Flag_may_be_short_branch = Flag_is_dead_loop_safe << 1, |
3851 | 650 Flag_avoid_back_to_back = Flag_may_be_short_branch << 1, |
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651 Flag_has_call = Flag_avoid_back_to_back << 1, |
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652 Flag_is_expensive = Flag_has_call << 1, |
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653 _max_flags = (Flag_is_expensive << 1) - 1 // allow flags combination |
0 | 654 }; |
655 | |
656 private: | |
657 jushort _class_id; | |
658 jushort _flags; | |
659 | |
660 protected: | |
661 // These methods should be called from constructors only. | |
662 void init_class_id(jushort c) { | |
663 assert(c <= _max_classes, "invalid node class"); | |
664 _class_id = c; // cast out const | |
665 } | |
666 void init_flags(jushort fl) { | |
667 assert(fl <= _max_flags, "invalid node flag"); | |
668 _flags |= fl; | |
669 } | |
670 void clear_flag(jushort fl) { | |
671 assert(fl <= _max_flags, "invalid node flag"); | |
672 _flags &= ~fl; | |
673 } | |
674 | |
675 public: | |
676 const jushort class_id() const { return _class_id; } | |
677 | |
678 const jushort flags() const { return _flags; } | |
679 | |
680 // Return a dense integer opcode number | |
681 virtual int Opcode() const; | |
682 | |
683 // Virtual inherited Node size | |
684 virtual uint size_of() const; | |
685 | |
686 // Other interesting Node properties | |
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687 #define DEFINE_CLASS_QUERY(type) \ |
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688 bool is_##type() const { \ |
0 | 689 return ((_class_id & ClassMask_##type) == Class_##type); \ |
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690 } \ |
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691 type##Node *as_##type() const { \ |
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692 assert(is_##type(), "invalid node class"); \ |
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693 return (type##Node*)this; \ |
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694 } \ |
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695 type##Node* isa_##type() const { \ |
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696 return (is_##type()) ? as_##type() : NULL; \ |
0 | 697 } |
698 | |
699 DEFINE_CLASS_QUERY(AbstractLock) | |
700 DEFINE_CLASS_QUERY(Add) | |
701 DEFINE_CLASS_QUERY(AddP) | |
702 DEFINE_CLASS_QUERY(Allocate) | |
703 DEFINE_CLASS_QUERY(AllocateArray) | |
704 DEFINE_CLASS_QUERY(Bool) | |
705 DEFINE_CLASS_QUERY(BoxLock) | |
3842 | 706 DEFINE_CLASS_QUERY(Call) |
0 | 707 DEFINE_CLASS_QUERY(CallDynamicJava) |
708 DEFINE_CLASS_QUERY(CallJava) | |
709 DEFINE_CLASS_QUERY(CallLeaf) | |
710 DEFINE_CLASS_QUERY(CallRuntime) | |
711 DEFINE_CLASS_QUERY(CallStaticJava) | |
712 DEFINE_CLASS_QUERY(Catch) | |
713 DEFINE_CLASS_QUERY(CatchProj) | |
714 DEFINE_CLASS_QUERY(CheckCastPP) | |
715 DEFINE_CLASS_QUERY(ConstraintCast) | |
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716 DEFINE_CLASS_QUERY(ClearArray) |
0 | 717 DEFINE_CLASS_QUERY(CMove) |
718 DEFINE_CLASS_QUERY(Cmp) | |
719 DEFINE_CLASS_QUERY(CountedLoop) | |
720 DEFINE_CLASS_QUERY(CountedLoopEnd) | |
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721 DEFINE_CLASS_QUERY(DecodeNarrowPtr) |
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722 DEFINE_CLASS_QUERY(DecodeN) |
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723 DEFINE_CLASS_QUERY(DecodeNKlass) |
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724 DEFINE_CLASS_QUERY(EncodeNarrowPtr) |
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725 DEFINE_CLASS_QUERY(EncodeP) |
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726 DEFINE_CLASS_QUERY(EncodePKlass) |
0 | 727 DEFINE_CLASS_QUERY(FastLock) |
728 DEFINE_CLASS_QUERY(FastUnlock) | |
729 DEFINE_CLASS_QUERY(If) | |
730 DEFINE_CLASS_QUERY(IfFalse) | |
731 DEFINE_CLASS_QUERY(IfTrue) | |
732 DEFINE_CLASS_QUERY(Initialize) | |
733 DEFINE_CLASS_QUERY(Jump) | |
734 DEFINE_CLASS_QUERY(JumpProj) | |
735 DEFINE_CLASS_QUERY(Load) | |
736 DEFINE_CLASS_QUERY(LoadStore) | |
737 DEFINE_CLASS_QUERY(Lock) | |
738 DEFINE_CLASS_QUERY(Loop) | |
739 DEFINE_CLASS_QUERY(Mach) | |
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740 DEFINE_CLASS_QUERY(MachBranch) |
0 | 741 DEFINE_CLASS_QUERY(MachCall) |
742 DEFINE_CLASS_QUERY(MachCallDynamicJava) | |
743 DEFINE_CLASS_QUERY(MachCallJava) | |
744 DEFINE_CLASS_QUERY(MachCallLeaf) | |
745 DEFINE_CLASS_QUERY(MachCallRuntime) | |
746 DEFINE_CLASS_QUERY(MachCallStaticJava) | |
2008 | 747 DEFINE_CLASS_QUERY(MachConstantBase) |
748 DEFINE_CLASS_QUERY(MachConstant) | |
3842 | 749 DEFINE_CLASS_QUERY(MachGoto) |
0 | 750 DEFINE_CLASS_QUERY(MachIf) |
751 DEFINE_CLASS_QUERY(MachNullCheck) | |
3842 | 752 DEFINE_CLASS_QUERY(MachProj) |
0 | 753 DEFINE_CLASS_QUERY(MachReturn) |
754 DEFINE_CLASS_QUERY(MachSafePoint) | |
755 DEFINE_CLASS_QUERY(MachSpillCopy) | |
756 DEFINE_CLASS_QUERY(MachTemp) | |
757 DEFINE_CLASS_QUERY(Mem) | |
758 DEFINE_CLASS_QUERY(MemBar) | |
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759 DEFINE_CLASS_QUERY(MemBarStoreStore) |
0 | 760 DEFINE_CLASS_QUERY(MergeMem) |
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761 DEFINE_CLASS_QUERY(Mul) |
0 | 762 DEFINE_CLASS_QUERY(Multi) |
763 DEFINE_CLASS_QUERY(MultiBranch) | |
33 | 764 DEFINE_CLASS_QUERY(Parm) |
0 | 765 DEFINE_CLASS_QUERY(PCTable) |
766 DEFINE_CLASS_QUERY(Phi) | |
767 DEFINE_CLASS_QUERY(Proj) | |
768 DEFINE_CLASS_QUERY(Region) | |
769 DEFINE_CLASS_QUERY(Root) | |
770 DEFINE_CLASS_QUERY(SafePoint) | |
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771 DEFINE_CLASS_QUERY(SafePointScalarObject) |
0 | 772 DEFINE_CLASS_QUERY(Start) |
773 DEFINE_CLASS_QUERY(Store) | |
774 DEFINE_CLASS_QUERY(Sub) | |
775 DEFINE_CLASS_QUERY(Type) | |
3842 | 776 DEFINE_CLASS_QUERY(Vector) |
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777 DEFINE_CLASS_QUERY(LoadVector) |
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778 DEFINE_CLASS_QUERY(StoreVector) |
0 | 779 DEFINE_CLASS_QUERY(Unlock) |
780 | |
781 #undef DEFINE_CLASS_QUERY | |
782 | |
783 // duplicate of is_MachSpillCopy() | |
784 bool is_SpillCopy () const { | |
785 return ((_class_id & ClassMask_MachSpillCopy) == Class_MachSpillCopy); | |
786 } | |
787 | |
788 bool is_Con () const { return (_flags & Flag_is_Con) != 0; } | |
789 // The data node which is safe to leave in dead loop during IGVN optimization. | |
790 bool is_dead_loop_safe() const { | |
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791 return is_Phi() || (is_Proj() && in(0) == NULL) || |
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792 ((_flags & (Flag_is_dead_loop_safe | Flag_is_Con)) != 0 && |
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793 (!is_Proj() || !in(0)->is_Allocate())); |
0 | 794 } |
795 | |
796 // is_Copy() returns copied edge index (0 or 1) | |
797 uint is_Copy() const { return (_flags & Flag_is_Copy); } | |
798 | |
799 virtual bool is_CFG() const { return false; } | |
800 | |
801 // If this node is control-dependent on a test, can it be | |
802 // rerouted to a dominating equivalent test? This is usually | |
803 // true of non-CFG nodes, but can be false for operations which | |
804 // depend for their correct sequencing on more than one test. | |
805 // (In that case, hoisting to a dominating test may silently | |
806 // skip some other important test.) | |
807 virtual bool depends_only_on_test() const { assert(!is_CFG(), ""); return true; }; | |
808 | |
809 // When building basic blocks, I need to have a notion of block beginning | |
810 // Nodes, next block selector Nodes (block enders), and next block | |
811 // projections. These calls need to work on their machine equivalents. The | |
812 // Ideal beginning Nodes are RootNode, RegionNode and StartNode. | |
813 bool is_block_start() const { | |
814 if ( is_Region() ) | |
815 return this == (const Node*)in(0); | |
816 else | |
3842 | 817 return is_Start(); |
0 | 818 } |
819 | |
820 // The Ideal control projection Nodes are IfTrue/IfFalse, JumpProjNode, Root, | |
821 // Goto and Return. This call also returns the block ending Node. | |
822 virtual const Node *is_block_proj() const; | |
823 | |
824 // The node is a "macro" node which needs to be expanded before matching | |
825 bool is_macro() const { return (_flags & Flag_is_macro) != 0; } | |
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826 // The node is expensive: the best control is set during loop opts |
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827 bool is_expensive() const { return (_flags & Flag_is_expensive) != 0 && in(0) != NULL; } |
0 | 828 |
829 //----------------- Optimization | |
830 | |
831 // Get the worst-case Type output for this Node. | |
832 virtual const class Type *bottom_type() const; | |
833 | |
834 // If we find a better type for a node, try to record it permanently. | |
835 // Return true if this node actually changed. | |
836 // Be sure to do the hash_delete game in the "rehash" variant. | |
837 void raise_bottom_type(const Type* new_type); | |
838 | |
839 // Get the address type with which this node uses and/or defs memory, | |
840 // or NULL if none. The address type is conservatively wide. | |
841 // Returns non-null for calls, membars, loads, stores, etc. | |
842 // Returns TypePtr::BOTTOM if the node touches memory "broadly". | |
843 virtual const class TypePtr *adr_type() const { return NULL; } | |
844 | |
845 // Return an existing node which computes the same function as this node. | |
846 // The optimistic combined algorithm requires this to return a Node which | |
847 // is a small number of steps away (e.g., one of my inputs). | |
848 virtual Node *Identity( PhaseTransform *phase ); | |
849 | |
850 // Return the set of values this Node can take on at runtime. | |
851 virtual const Type *Value( PhaseTransform *phase ) const; | |
852 | |
853 // Return a node which is more "ideal" than the current node. | |
854 // The invariants on this call are subtle. If in doubt, read the | |
855 // treatise in node.cpp above the default implemention AND TEST WITH | |
856 // +VerifyIterativeGVN! | |
857 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
858 | |
859 // Some nodes have specific Ideal subgraph transformations only if they are | |
860 // unique users of specific nodes. Such nodes should be put on IGVN worklist | |
861 // for the transformations to happen. | |
862 bool has_special_unique_user() const; | |
863 | |
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864 // Skip Proj and CatchProj nodes chains. Check for Null and Top. |
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865 Node* find_exact_control(Node* ctrl); |
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866 |
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867 // Check if 'this' node dominates or equal to 'sub'. |
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868 bool dominates(Node* sub, Node_List &nlist); |
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869 |
0 | 870 protected: |
871 bool remove_dead_region(PhaseGVN *phase, bool can_reshape); | |
872 public: | |
873 | |
874 // Idealize graph, using DU info. Done after constant propagation | |
875 virtual Node *Ideal_DU_postCCP( PhaseCCP *ccp ); | |
876 | |
877 // See if there is valid pipeline info | |
878 static const Pipeline *pipeline_class(); | |
879 virtual const Pipeline *pipeline() const; | |
880 | |
881 // Compute the latency from the def to this instruction of the ith input node | |
882 uint latency(uint i); | |
883 | |
884 // Hash & compare functions, for pessimistic value numbering | |
885 | |
886 // If the hash function returns the special sentinel value NO_HASH, | |
887 // the node is guaranteed never to compare equal to any other node. | |
605 | 888 // If we accidentally generate a hash with value NO_HASH the node |
0 | 889 // won't go into the table and we'll lose a little optimization. |
890 enum { NO_HASH = 0 }; | |
891 virtual uint hash() const; | |
892 virtual uint cmp( const Node &n ) const; | |
893 | |
894 // Operation appears to be iteratively computed (such as an induction variable) | |
895 // It is possible for this operation to return false for a loop-varying | |
896 // value, if it appears (by local graph inspection) to be computed by a simple conditional. | |
897 bool is_iteratively_computed(); | |
898 | |
899 // Determine if a node is Counted loop induction variable. | |
900 // The method is defined in loopnode.cpp. | |
901 const Node* is_loop_iv() const; | |
902 | |
903 // Return a node with opcode "opc" and same inputs as "this" if one can | |
904 // be found; Otherwise return NULL; | |
905 Node* find_similar(int opc); | |
906 | |
907 // Return the unique control out if only one. Null if none or more than one. | |
908 Node* unique_ctrl_out(); | |
909 | |
910 //----------------- Code Generation | |
911 | |
912 // Ideal register class for Matching. Zero means unmatched instruction | |
913 // (these are cloned instead of converted to machine nodes). | |
914 virtual uint ideal_reg() const; | |
915 | |
916 static const uint NotAMachineReg; // must be > max. machine register | |
917 | |
918 // Do we Match on this edge index or not? Generally false for Control | |
919 // and true for everything else. Weird for calls & returns. | |
920 virtual uint match_edge(uint idx) const; | |
921 | |
922 // Register class output is returned in | |
923 virtual const RegMask &out_RegMask() const; | |
924 // Register class input is expected in | |
925 virtual const RegMask &in_RegMask(uint) const; | |
926 // Should we clone rather than spill this instruction? | |
927 bool rematerialize() const; | |
928 | |
929 // Return JVM State Object if this Node carries debug info, or NULL otherwise | |
930 virtual JVMState* jvms() const; | |
931 | |
932 // Print as assembly | |
933 virtual void format( PhaseRegAlloc *, outputStream* st = tty ) const; | |
934 // Emit bytes starting at parameter 'ptr' | |
935 // Bump 'ptr' by the number of output bytes | |
936 virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const; | |
937 // Size of instruction in bytes | |
938 virtual uint size(PhaseRegAlloc *ra_) const; | |
939 | |
940 // Convenience function to extract an integer constant from a node. | |
941 // If it is not an integer constant (either Con, CastII, or Mach), | |
942 // return value_if_unknown. | |
943 jint find_int_con(jint value_if_unknown) const { | |
944 const TypeInt* t = find_int_type(); | |
945 return (t != NULL && t->is_con()) ? t->get_con() : value_if_unknown; | |
946 } | |
947 // Return the constant, knowing it is an integer constant already | |
948 jint get_int() const { | |
949 const TypeInt* t = find_int_type(); | |
950 guarantee(t != NULL, "must be con"); | |
951 return t->get_con(); | |
952 } | |
953 // Here's where the work is done. Can produce non-constant int types too. | |
954 const TypeInt* find_int_type() const; | |
955 | |
956 // Same thing for long (and intptr_t, via type.hpp): | |
957 jlong get_long() const { | |
958 const TypeLong* t = find_long_type(); | |
959 guarantee(t != NULL, "must be con"); | |
960 return t->get_con(); | |
961 } | |
962 jlong find_long_con(jint value_if_unknown) const { | |
963 const TypeLong* t = find_long_type(); | |
964 return (t != NULL && t->is_con()) ? t->get_con() : value_if_unknown; | |
965 } | |
966 const TypeLong* find_long_type() const; | |
967 | |
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968 const TypePtr* get_ptr_type() const; |
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969 |
0 | 970 // These guys are called by code generated by ADLC: |
971 intptr_t get_ptr() const; | |
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972 intptr_t get_narrowcon() const; |
0 | 973 jdouble getd() const; |
974 jfloat getf() const; | |
975 | |
976 // Nodes which are pinned into basic blocks | |
977 virtual bool pinned() const { return false; } | |
978 | |
979 // Nodes which use memory without consuming it, hence need antidependences | |
980 // More specifically, needs_anti_dependence_check returns true iff the node | |
981 // (a) does a load, and (b) does not perform a store (except perhaps to a | |
982 // stack slot or some other unaliased location). | |
983 bool needs_anti_dependence_check() const; | |
984 | |
985 // Return which operand this instruction may cisc-spill. In other words, | |
986 // return operand position that can convert from reg to memory access | |
987 virtual int cisc_operand() const { return AdlcVMDeps::Not_cisc_spillable; } | |
988 bool is_cisc_alternate() const { return (_flags & Flag_is_cisc_alternate) != 0; } | |
989 | |
990 //----------------- Graph walking | |
991 public: | |
992 // Walk and apply member functions recursively. | |
993 // Supplied (this) pointer is root. | |
994 void walk(NFunc pre, NFunc post, void *env); | |
995 static void nop(Node &, void*); // Dummy empty function | |
996 static void packregion( Node &n, void* ); | |
997 private: | |
998 void walk_(NFunc pre, NFunc post, void *env, VectorSet &visited); | |
999 | |
1000 //----------------- Printing, etc | |
1001 public: | |
1002 #ifndef PRODUCT | |
1003 Node* find(int idx) const; // Search the graph for the given idx. | |
1004 Node* find_ctrl(int idx) const; // Search control ancestors for the given idx. | |
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1005 void dump() const { dump("\n"); } // Print this node. |
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1006 void dump(const char* suffix, outputStream *st = tty) const;// Print this node. |
0 | 1007 void dump(int depth) const; // Print this node, recursively to depth d |
1008 void dump_ctrl(int depth) const; // Print control nodes, to depth d | |
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1009 virtual void dump_req(outputStream *st = tty) const; // Print required-edge info |
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1010 virtual void dump_prec(outputStream *st = tty) const; // Print precedence-edge info |
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1011 virtual void dump_out(outputStream *st = tty) const; // Print the output edge info |
0 | 1012 virtual void dump_spec(outputStream *st) const {}; // Print per-node info |
1013 void verify_edges(Unique_Node_List &visited); // Verify bi-directional edges | |
1014 void verify() const; // Check Def-Use info for my subgraph | |
1015 static void verify_recur(const Node *n, int verify_depth, VectorSet &old_space, VectorSet &new_space); | |
1016 | |
1017 // This call defines a class-unique string used to identify class instances | |
1018 virtual const char *Name() const; | |
1019 | |
1020 void dump_format(PhaseRegAlloc *ra) const; // debug access to MachNode::format(...) | |
1021 // RegMask Print Functions | |
1022 void dump_in_regmask(int idx) { in_RegMask(idx).dump(); } | |
1023 void dump_out_regmask() { out_RegMask().dump(); } | |
1024 static int _in_dump_cnt; | |
1025 static bool in_dump() { return _in_dump_cnt > 0; } | |
1026 void fast_dump() const { | |
1027 tty->print("%4d: %-17s", _idx, Name()); | |
1028 for (uint i = 0; i < len(); i++) | |
1029 if (in(i)) | |
1030 tty->print(" %4d", in(i)->_idx); | |
1031 else | |
1032 tty->print(" NULL"); | |
1033 tty->print("\n"); | |
1034 } | |
1035 #endif | |
1036 #ifdef ASSERT | |
1037 void verify_construction(); | |
1038 bool verify_jvms(const JVMState* jvms) const; | |
1039 int _debug_idx; // Unique value assigned to every node. | |
1040 int debug_idx() const { return _debug_idx; } | |
1041 void set_debug_idx( int debug_idx ) { _debug_idx = debug_idx; } | |
1042 | |
1043 Node* _debug_orig; // Original version of this, if any. | |
1044 Node* debug_orig() const { return _debug_orig; } | |
1045 void set_debug_orig(Node* orig); // _debug_orig = orig | |
1046 | |
1047 int _hash_lock; // Barrier to modifications of nodes in the hash table | |
1048 void enter_hash_lock() { ++_hash_lock; assert(_hash_lock < 99, "in too many hash tables?"); } | |
1049 void exit_hash_lock() { --_hash_lock; assert(_hash_lock >= 0, "mispaired hash locks"); } | |
1050 | |
1051 static void init_NodeProperty(); | |
1052 | |
1053 #if OPTO_DU_ITERATOR_ASSERT | |
1054 const Node* _last_del; // The last deleted node. | |
1055 uint _del_tick; // Bumped when a deletion happens.. | |
1056 #endif | |
1057 #endif | |
1058 }; | |
1059 | |
1060 //----------------------------------------------------------------------------- | |
1061 // Iterators over DU info, and associated Node functions. | |
1062 | |
1063 #if OPTO_DU_ITERATOR_ASSERT | |
1064 | |
1065 // Common code for assertion checking on DU iterators. | |
1066 class DUIterator_Common VALUE_OBJ_CLASS_SPEC { | |
1067 #ifdef ASSERT | |
1068 protected: | |
1069 bool _vdui; // cached value of VerifyDUIterators | |
1070 const Node* _node; // the node containing the _out array | |
1071 uint _outcnt; // cached node->_outcnt | |
1072 uint _del_tick; // cached node->_del_tick | |
1073 Node* _last; // last value produced by the iterator | |
1074 | |
1075 void sample(const Node* node); // used by c'tor to set up for verifies | |
1076 void verify(const Node* node, bool at_end_ok = false); | |
1077 void verify_resync(); | |
1078 void reset(const DUIterator_Common& that); | |
1079 | |
1080 // The VDUI_ONLY macro protects code conditionalized on VerifyDUIterators | |
1081 #define I_VDUI_ONLY(i,x) { if ((i)._vdui) { x; } } | |
1082 #else | |
1083 #define I_VDUI_ONLY(i,x) { } | |
1084 #endif //ASSERT | |
1085 }; | |
1086 | |
1087 #define VDUI_ONLY(x) I_VDUI_ONLY(*this, x) | |
1088 | |
1089 // Default DU iterator. Allows appends onto the out array. | |
1090 // Allows deletion from the out array only at the current point. | |
1091 // Usage: | |
1092 // for (DUIterator i = x->outs(); x->has_out(i); i++) { | |
1093 // Node* y = x->out(i); | |
1094 // ... | |
1095 // } | |
1096 // Compiles in product mode to a unsigned integer index, which indexes | |
1097 // onto a repeatedly reloaded base pointer of x->_out. The loop predicate | |
1098 // also reloads x->_outcnt. If you delete, you must perform "--i" just | |
1099 // before continuing the loop. You must delete only the last-produced | |
1100 // edge. You must delete only a single copy of the last-produced edge, | |
1101 // or else you must delete all copies at once (the first time the edge | |
1102 // is produced by the iterator). | |
1103 class DUIterator : public DUIterator_Common { | |
1104 friend class Node; | |
1105 | |
1106 // This is the index which provides the product-mode behavior. | |
1107 // Whatever the product-mode version of the system does to the | |
1108 // DUI index is done to this index. All other fields in | |
1109 // this class are used only for assertion checking. | |
1110 uint _idx; | |
1111 | |
1112 #ifdef ASSERT | |
1113 uint _refresh_tick; // Records the refresh activity. | |
1114 | |
1115 void sample(const Node* node); // Initialize _refresh_tick etc. | |
1116 void verify(const Node* node, bool at_end_ok = false); | |
1117 void verify_increment(); // Verify an increment operation. | |
1118 void verify_resync(); // Verify that we can back up over a deletion. | |
1119 void verify_finish(); // Verify that the loop terminated properly. | |
1120 void refresh(); // Resample verification info. | |
1121 void reset(const DUIterator& that); // Resample after assignment. | |
1122 #endif | |
1123 | |
1124 DUIterator(const Node* node, int dummy_to_avoid_conversion) | |
1125 { _idx = 0; debug_only(sample(node)); } | |
1126 | |
1127 public: | |
1128 // initialize to garbage; clear _vdui to disable asserts | |
1129 DUIterator() | |
1130 { /*initialize to garbage*/ debug_only(_vdui = false); } | |
1131 | |
1132 void operator++(int dummy_to_specify_postfix_op) | |
1133 { _idx++; VDUI_ONLY(verify_increment()); } | |
1134 | |
1135 void operator--() | |
1136 { VDUI_ONLY(verify_resync()); --_idx; } | |
1137 | |
1138 ~DUIterator() | |
1139 { VDUI_ONLY(verify_finish()); } | |
1140 | |
1141 void operator=(const DUIterator& that) | |
1142 { _idx = that._idx; debug_only(reset(that)); } | |
1143 }; | |
1144 | |
1145 DUIterator Node::outs() const | |
1146 { return DUIterator(this, 0); } | |
1147 DUIterator& Node::refresh_out_pos(DUIterator& i) const | |
1148 { I_VDUI_ONLY(i, i.refresh()); return i; } | |
1149 bool Node::has_out(DUIterator& i) const | |
1150 { I_VDUI_ONLY(i, i.verify(this,true));return i._idx < _outcnt; } | |
1151 Node* Node::out(DUIterator& i) const | |
1152 { I_VDUI_ONLY(i, i.verify(this)); return debug_only(i._last=) _out[i._idx]; } | |
1153 | |
1154 | |
1155 // Faster DU iterator. Disallows insertions into the out array. | |
1156 // Allows deletion from the out array only at the current point. | |
1157 // Usage: | |
1158 // for (DUIterator_Fast imax, i = x->fast_outs(imax); i < imax; i++) { | |
1159 // Node* y = x->fast_out(i); | |
1160 // ... | |
1161 // } | |
1162 // Compiles in product mode to raw Node** pointer arithmetic, with | |
1163 // no reloading of pointers from the original node x. If you delete, | |
1164 // you must perform "--i; --imax" just before continuing the loop. | |
1165 // If you delete multiple copies of the same edge, you must decrement | |
1166 // imax, but not i, multiple times: "--i, imax -= num_edges". | |
1167 class DUIterator_Fast : public DUIterator_Common { | |
1168 friend class Node; | |
1169 friend class DUIterator_Last; | |
1170 | |
1171 // This is the pointer which provides the product-mode behavior. | |
1172 // Whatever the product-mode version of the system does to the | |
1173 // DUI pointer is done to this pointer. All other fields in | |
1174 // this class are used only for assertion checking. | |
1175 Node** _outp; | |
1176 | |
1177 #ifdef ASSERT | |
1178 void verify(const Node* node, bool at_end_ok = false); | |
1179 void verify_limit(); | |
1180 void verify_resync(); | |
1181 void verify_relimit(uint n); | |
1182 void reset(const DUIterator_Fast& that); | |
1183 #endif | |
1184 | |
1185 // Note: offset must be signed, since -1 is sometimes passed | |
1186 DUIterator_Fast(const Node* node, ptrdiff_t offset) | |
1187 { _outp = node->_out + offset; debug_only(sample(node)); } | |
1188 | |
1189 public: | |
1190 // initialize to garbage; clear _vdui to disable asserts | |
1191 DUIterator_Fast() | |
1192 { /*initialize to garbage*/ debug_only(_vdui = false); } | |
1193 | |
1194 void operator++(int dummy_to_specify_postfix_op) | |
1195 { _outp++; VDUI_ONLY(verify(_node, true)); } | |
1196 | |
1197 void operator--() | |
1198 { VDUI_ONLY(verify_resync()); --_outp; } | |
1199 | |
1200 void operator-=(uint n) // applied to the limit only | |
1201 { _outp -= n; VDUI_ONLY(verify_relimit(n)); } | |
1202 | |
1203 bool operator<(DUIterator_Fast& limit) { | |
1204 I_VDUI_ONLY(*this, this->verify(_node, true)); | |
1205 I_VDUI_ONLY(limit, limit.verify_limit()); | |
1206 return _outp < limit._outp; | |
1207 } | |
1208 | |
1209 void operator=(const DUIterator_Fast& that) | |
1210 { _outp = that._outp; debug_only(reset(that)); } | |
1211 }; | |
1212 | |
1213 DUIterator_Fast Node::fast_outs(DUIterator_Fast& imax) const { | |
1214 // Assign a limit pointer to the reference argument: | |
1215 imax = DUIterator_Fast(this, (ptrdiff_t)_outcnt); | |
1216 // Return the base pointer: | |
1217 return DUIterator_Fast(this, 0); | |
1218 } | |
1219 Node* Node::fast_out(DUIterator_Fast& i) const { | |
1220 I_VDUI_ONLY(i, i.verify(this)); | |
1221 return debug_only(i._last=) *i._outp; | |
1222 } | |
1223 | |
1224 | |
1225 // Faster DU iterator. Requires each successive edge to be removed. | |
1226 // Does not allow insertion of any edges. | |
1227 // Usage: | |
1228 // for (DUIterator_Last imin, i = x->last_outs(imin); i >= imin; i -= num_edges) { | |
1229 // Node* y = x->last_out(i); | |
1230 // ... | |
1231 // } | |
1232 // Compiles in product mode to raw Node** pointer arithmetic, with | |
1233 // no reloading of pointers from the original node x. | |
1234 class DUIterator_Last : private DUIterator_Fast { | |
1235 friend class Node; | |
1236 | |
1237 #ifdef ASSERT | |
1238 void verify(const Node* node, bool at_end_ok = false); | |
1239 void verify_limit(); | |
1240 void verify_step(uint num_edges); | |
1241 #endif | |
1242 | |
1243 // Note: offset must be signed, since -1 is sometimes passed | |
1244 DUIterator_Last(const Node* node, ptrdiff_t offset) | |
1245 : DUIterator_Fast(node, offset) { } | |
1246 | |
1247 void operator++(int dummy_to_specify_postfix_op) {} // do not use | |
1248 void operator<(int) {} // do not use | |
1249 | |
1250 public: | |
1251 DUIterator_Last() { } | |
1252 // initialize to garbage | |
1253 | |
1254 void operator--() | |
1255 { _outp--; VDUI_ONLY(verify_step(1)); } | |
1256 | |
1257 void operator-=(uint n) | |
1258 { _outp -= n; VDUI_ONLY(verify_step(n)); } | |
1259 | |
1260 bool operator>=(DUIterator_Last& limit) { | |
1261 I_VDUI_ONLY(*this, this->verify(_node, true)); | |
1262 I_VDUI_ONLY(limit, limit.verify_limit()); | |
1263 return _outp >= limit._outp; | |
1264 } | |
1265 | |
1266 void operator=(const DUIterator_Last& that) | |
1267 { DUIterator_Fast::operator=(that); } | |
1268 }; | |
1269 | |
1270 DUIterator_Last Node::last_outs(DUIterator_Last& imin) const { | |
1271 // Assign a limit pointer to the reference argument: | |
1272 imin = DUIterator_Last(this, 0); | |
1273 // Return the initial pointer: | |
1274 return DUIterator_Last(this, (ptrdiff_t)_outcnt - 1); | |
1275 } | |
1276 Node* Node::last_out(DUIterator_Last& i) const { | |
1277 I_VDUI_ONLY(i, i.verify(this)); | |
1278 return debug_only(i._last=) *i._outp; | |
1279 } | |
1280 | |
1281 #endif //OPTO_DU_ITERATOR_ASSERT | |
1282 | |
1283 #undef I_VDUI_ONLY | |
1284 #undef VDUI_ONLY | |
1285 | |
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1286 // An Iterator that truly follows the iterator pattern. Doesn't |
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1287 // support deletion but could be made to. |
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1288 // |
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1289 // for (SimpleDUIterator i(n); i.has_next(); i.next()) { |
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1290 // Node* m = i.get(); |
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1291 // |
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1292 class SimpleDUIterator : public StackObj { |
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1293 private: |
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1294 Node* node; |
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1295 DUIterator_Fast i; |
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1296 DUIterator_Fast imax; |
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1297 public: |
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1298 SimpleDUIterator(Node* n): node(n), i(n->fast_outs(imax)) {} |
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1299 bool has_next() { return i < imax; } |
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1300 void next() { i++; } |
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1301 Node* get() { return node->fast_out(i); } |
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1302 }; |
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1303 |
0 | 1304 |
1305 //----------------------------------------------------------------------------- | |
1306 // Map dense integer indices to Nodes. Uses classic doubling-array trick. | |
1307 // Abstractly provides an infinite array of Node*'s, initialized to NULL. | |
1308 // Note that the constructor just zeros things, and since I use Arena | |
1309 // allocation I do not need a destructor to reclaim storage. | |
1310 class Node_Array : public ResourceObj { | |
3939 | 1311 friend class VMStructs; |
0 | 1312 protected: |
1313 Arena *_a; // Arena to allocate in | |
1314 uint _max; | |
1315 Node **_nodes; | |
1316 void grow( uint i ); // Grow array node to fit | |
1317 public: | |
1318 Node_Array(Arena *a) : _a(a), _max(OptoNodeListSize) { | |
1319 _nodes = NEW_ARENA_ARRAY( a, Node *, OptoNodeListSize ); | |
1320 for( int i = 0; i < OptoNodeListSize; i++ ) { | |
1321 _nodes[i] = NULL; | |
1322 } | |
1323 } | |
1324 | |
1325 Node_Array(Node_Array *na) : _a(na->_a), _max(na->_max), _nodes(na->_nodes) {} | |
1326 Node *operator[] ( uint i ) const // Lookup, or NULL for not mapped | |
1327 { return (i<_max) ? _nodes[i] : (Node*)NULL; } | |
1328 Node *at( uint i ) const { assert(i<_max,"oob"); return _nodes[i]; } | |
1329 Node **adr() { return _nodes; } | |
1330 // Extend the mapping: index i maps to Node *n. | |
1331 void map( uint i, Node *n ) { if( i>=_max ) grow(i); _nodes[i] = n; } | |
1332 void insert( uint i, Node *n ); | |
1333 void remove( uint i ); // Remove, preserving order | |
1334 void sort( C_sort_func_t func); | |
1335 void reset( Arena *new_a ); // Zap mapping to empty; reclaim storage | |
1336 void clear(); // Set all entries to NULL, keep storage | |
1337 uint Size() const { return _max; } | |
1338 void dump() const; | |
1339 }; | |
1340 | |
1341 class Node_List : public Node_Array { | |
3939 | 1342 friend class VMStructs; |
0 | 1343 uint _cnt; |
1344 public: | |
1345 Node_List() : Node_Array(Thread::current()->resource_area()), _cnt(0) {} | |
1346 Node_List(Arena *a) : Node_Array(a), _cnt(0) {} | |
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1347 bool contains(Node* n) { |
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1348 for (uint e = 0; e < size(); e++) { |
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1349 if (at(e) == n) return true; |
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1350 } |
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1351 return false; |
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1352 } |
0 | 1353 void insert( uint i, Node *n ) { Node_Array::insert(i,n); _cnt++; } |
1354 void remove( uint i ) { Node_Array::remove(i); _cnt--; } | |
1355 void push( Node *b ) { map(_cnt++,b); } | |
1356 void yank( Node *n ); // Find and remove | |
1357 Node *pop() { return _nodes[--_cnt]; } | |
1358 Node *rpop() { Node *b = _nodes[0]; _nodes[0]=_nodes[--_cnt]; return b;} | |
1359 void clear() { _cnt = 0; Node_Array::clear(); } // retain storage | |
1360 uint size() const { return _cnt; } | |
1361 void dump() const; | |
1362 }; | |
1363 | |
1364 //------------------------------Unique_Node_List------------------------------- | |
1365 class Unique_Node_List : public Node_List { | |
3939 | 1366 friend class VMStructs; |
0 | 1367 VectorSet _in_worklist; |
1368 uint _clock_index; // Index in list where to pop from next | |
1369 public: | |
1370 Unique_Node_List() : Node_List(), _in_worklist(Thread::current()->resource_area()), _clock_index(0) {} | |
1371 Unique_Node_List(Arena *a) : Node_List(a), _in_worklist(a), _clock_index(0) {} | |
1372 | |
1373 void remove( Node *n ); | |
1374 bool member( Node *n ) { return _in_worklist.test(n->_idx) != 0; } | |
1375 VectorSet &member_set(){ return _in_worklist; } | |
1376 | |
1377 void push( Node *b ) { | |
1378 if( !_in_worklist.test_set(b->_idx) ) | |
1379 Node_List::push(b); | |
1380 } | |
1381 Node *pop() { | |
1382 if( _clock_index >= size() ) _clock_index = 0; | |
1383 Node *b = at(_clock_index); | |
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1384 map( _clock_index, Node_List::pop()); |
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1385 if (size() != 0) _clock_index++; // Always start from 0 |
0 | 1386 _in_worklist >>= b->_idx; |
1387 return b; | |
1388 } | |
1389 Node *remove( uint i ) { | |
1390 Node *b = Node_List::at(i); | |
1391 _in_worklist >>= b->_idx; | |
1392 map(i,Node_List::pop()); | |
1393 return b; | |
1394 } | |
1395 void yank( Node *n ) { _in_worklist >>= n->_idx; Node_List::yank(n); } | |
1396 void clear() { | |
1397 _in_worklist.Clear(); // Discards storage but grows automatically | |
1398 Node_List::clear(); | |
1399 _clock_index = 0; | |
1400 } | |
1401 | |
1402 // Used after parsing to remove useless nodes before Iterative GVN | |
1403 void remove_useless_nodes(VectorSet &useful); | |
1404 | |
1405 #ifndef PRODUCT | |
1406 void print_set() const { _in_worklist.print(); } | |
1407 #endif | |
1408 }; | |
1409 | |
1410 // Inline definition of Compile::record_for_igvn must be deferred to this point. | |
1411 inline void Compile::record_for_igvn(Node* n) { | |
1412 _for_igvn->push(n); | |
1413 } | |
1414 | |
1415 //------------------------------Node_Stack------------------------------------- | |
1416 class Node_Stack { | |
3939 | 1417 friend class VMStructs; |
0 | 1418 protected: |
1419 struct INode { | |
1420 Node *node; // Processed node | |
1421 uint indx; // Index of next node's child | |
1422 }; | |
1423 INode *_inode_top; // tos, stack grows up | |
1424 INode *_inode_max; // End of _inodes == _inodes + _max | |
1425 INode *_inodes; // Array storage for the stack | |
1426 Arena *_a; // Arena to allocate in | |
1427 void grow(); | |
1428 public: | |
1429 Node_Stack(int size) { | |
1430 size_t max = (size > OptoNodeListSize) ? size : OptoNodeListSize; | |
1431 _a = Thread::current()->resource_area(); | |
1432 _inodes = NEW_ARENA_ARRAY( _a, INode, max ); | |
1433 _inode_max = _inodes + max; | |
1434 _inode_top = _inodes - 1; // stack is empty | |
1435 } | |
1436 | |
1437 Node_Stack(Arena *a, int size) : _a(a) { | |
1438 size_t max = (size > OptoNodeListSize) ? size : OptoNodeListSize; | |
1439 _inodes = NEW_ARENA_ARRAY( _a, INode, max ); | |
1440 _inode_max = _inodes + max; | |
1441 _inode_top = _inodes - 1; // stack is empty | |
1442 } | |
1443 | |
1444 void pop() { | |
1445 assert(_inode_top >= _inodes, "node stack underflow"); | |
1446 --_inode_top; | |
1447 } | |
1448 void push(Node *n, uint i) { | |
1449 ++_inode_top; | |
1450 if (_inode_top >= _inode_max) grow(); | |
1451 INode *top = _inode_top; // optimization | |
1452 top->node = n; | |
1453 top->indx = i; | |
1454 } | |
1455 Node *node() const { | |
1456 return _inode_top->node; | |
1457 } | |
1458 Node* node_at(uint i) const { | |
1459 assert(_inodes + i <= _inode_top, "in range"); | |
1460 return _inodes[i].node; | |
1461 } | |
1462 uint index() const { | |
1463 return _inode_top->indx; | |
1464 } | |
247 | 1465 uint index_at(uint i) const { |
1466 assert(_inodes + i <= _inode_top, "in range"); | |
1467 return _inodes[i].indx; | |
1468 } | |
0 | 1469 void set_node(Node *n) { |
1470 _inode_top->node = n; | |
1471 } | |
1472 void set_index(uint i) { | |
1473 _inode_top->indx = i; | |
1474 } | |
1475 uint size_max() const { return (uint)pointer_delta(_inode_max, _inodes, sizeof(INode)); } // Max size | |
40 | 1476 uint size() const { return (uint)pointer_delta((_inode_top+1), _inodes, sizeof(INode)); } // Current size |
0 | 1477 bool is_nonempty() const { return (_inode_top >= _inodes); } |
1478 bool is_empty() const { return (_inode_top < _inodes); } | |
1479 void clear() { _inode_top = _inodes - 1; } // retain storage | |
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1480 |
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1481 // Node_Stack is used to map nodes. |
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1482 Node* find(uint idx) const; |
0 | 1483 }; |
1484 | |
1485 | |
1486 //-----------------------------Node_Notes-------------------------------------- | |
1487 // Debugging or profiling annotations loosely and sparsely associated | |
1488 // with some nodes. See Compile::node_notes_at for the accessor. | |
1489 class Node_Notes VALUE_OBJ_CLASS_SPEC { | |
3939 | 1490 friend class VMStructs; |
0 | 1491 JVMState* _jvms; |
1492 | |
1493 public: | |
1494 Node_Notes(JVMState* jvms = NULL) { | |
1495 _jvms = jvms; | |
1496 } | |
1497 | |
1498 JVMState* jvms() { return _jvms; } | |
1499 void set_jvms(JVMState* x) { _jvms = x; } | |
1500 | |
1501 // True if there is nothing here. | |
1502 bool is_clear() { | |
1503 return (_jvms == NULL); | |
1504 } | |
1505 | |
1506 // Make there be nothing here. | |
1507 void clear() { | |
1508 _jvms = NULL; | |
1509 } | |
1510 | |
1511 // Make a new, clean node notes. | |
1512 static Node_Notes* make(Compile* C) { | |
1513 Node_Notes* nn = NEW_ARENA_ARRAY(C->comp_arena(), Node_Notes, 1); | |
1514 nn->clear(); | |
1515 return nn; | |
1516 } | |
1517 | |
1518 Node_Notes* clone(Compile* C) { | |
1519 Node_Notes* nn = NEW_ARENA_ARRAY(C->comp_arena(), Node_Notes, 1); | |
1520 (*nn) = (*this); | |
1521 return nn; | |
1522 } | |
1523 | |
1524 // Absorb any information from source. | |
1525 bool update_from(Node_Notes* source) { | |
1526 bool changed = false; | |
1527 if (source != NULL) { | |
1528 if (source->jvms() != NULL) { | |
1529 set_jvms(source->jvms()); | |
1530 changed = true; | |
1531 } | |
1532 } | |
1533 return changed; | |
1534 } | |
1535 }; | |
1536 | |
1537 // Inlined accessors for Compile::node_nodes that require the preceding class: | |
1538 inline Node_Notes* | |
1539 Compile::locate_node_notes(GrowableArray<Node_Notes*>* arr, | |
1540 int idx, bool can_grow) { | |
1541 assert(idx >= 0, "oob"); | |
1542 int block_idx = (idx >> _log2_node_notes_block_size); | |
1543 int grow_by = (block_idx - (arr == NULL? 0: arr->length())); | |
1544 if (grow_by >= 0) { | |
1545 if (!can_grow) return NULL; | |
1546 grow_node_notes(arr, grow_by + 1); | |
1547 } | |
1548 // (Every element of arr is a sub-array of length _node_notes_block_size.) | |
1549 return arr->at(block_idx) + (idx & (_node_notes_block_size-1)); | |
1550 } | |
1551 | |
1552 inline bool | |
1553 Compile::set_node_notes_at(int idx, Node_Notes* value) { | |
1554 if (value == NULL || value->is_clear()) | |
1555 return false; // nothing to write => write nothing | |
1556 Node_Notes* loc = locate_node_notes(_node_note_array, idx, true); | |
1557 assert(loc != NULL, ""); | |
1558 return loc->update_from(value); | |
1559 } | |
1560 | |
1561 | |
1562 //------------------------------TypeNode--------------------------------------- | |
1563 // Node with a Type constant. | |
1564 class TypeNode : public Node { | |
1565 protected: | |
1566 virtual uint hash() const; // Check the type | |
1567 virtual uint cmp( const Node &n ) const; | |
1568 virtual uint size_of() const; // Size is bigger | |
1569 const Type* const _type; | |
1570 public: | |
1571 void set_type(const Type* t) { | |
1572 assert(t != NULL, "sanity"); | |
1573 debug_only(uint check_hash = (VerifyHashTableKeys && _hash_lock) ? hash() : NO_HASH); | |
1574 *(const Type**)&_type = t; // cast away const-ness | |
1575 // If this node is in the hash table, make sure it doesn't need a rehash. | |
1576 assert(check_hash == NO_HASH || check_hash == hash(), "type change must preserve hash code"); | |
1577 } | |
1578 const Type* type() const { assert(_type != NULL, "sanity"); return _type; }; | |
1579 TypeNode( const Type *t, uint required ) : Node(required), _type(t) { | |
1580 init_class_id(Class_Type); | |
1581 } | |
1582 virtual const Type *Value( PhaseTransform *phase ) const; | |
1583 virtual const Type *bottom_type() const; | |
1584 virtual uint ideal_reg() const; | |
1585 #ifndef PRODUCT | |
1586 virtual void dump_spec(outputStream *st) const; | |
1587 #endif | |
1588 }; | |
1972 | 1589 |
1590 #endif // SHARE_VM_OPTO_NODE_HPP |