Mercurial > hg > truffle
annotate src/share/vm/opto/node.hpp @ 8048:8b3da8d14c93
7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob
Summary: Add support for expensive nodes.
Reviewed-by: kvn
| author | roland |
|---|---|
| date | Tue, 12 Feb 2013 12:56:11 +0100 |
| parents | a7114d3d712e |
| children | 6f3fd5150b67 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #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 Block_Array; | |
| 46 class BoolNode; | |
| 47 class BoxLockNode; | |
| 48 class CMoveNode; | |
| 49 class CallDynamicJavaNode; | |
| 50 class CallJavaNode; | |
| 51 class CallLeafNode; | |
| 52 class CallNode; | |
| 53 class CallRuntimeNode; | |
| 54 class CallStaticJavaNode; | |
| 55 class CatchNode; | |
| 56 class CatchProjNode; | |
| 57 class CheckCastPPNode; | |
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58 class ClearArrayNode; |
| 0 | 59 class CmpNode; |
| 60 class CodeBuffer; | |
| 61 class ConstraintCastNode; | |
| 62 class ConNode; | |
| 63 class CountedLoopNode; | |
| 64 class CountedLoopEndNode; | |
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65 class DecodeNarrowPtrNode; |
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66 class DecodeNNode; |
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67 class DecodeNKlassNode; |
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68 class EncodeNarrowPtrNode; |
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69 class EncodePNode; |
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70 class EncodePKlassNode; |
| 0 | 71 class FastLockNode; |
| 72 class FastUnlockNode; | |
| 73 class IfNode; | |
| 3842 | 74 class IfFalseNode; |
| 75 class IfTrueNode; | |
| 0 | 76 class InitializeNode; |
| 77 class JVMState; | |
| 78 class JumpNode; | |
| 79 class JumpProjNode; | |
| 80 class LoadNode; | |
| 81 class LoadStoreNode; | |
| 82 class LockNode; | |
| 83 class LoopNode; | |
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84 class MachBranchNode; |
| 0 | 85 class MachCallDynamicJavaNode; |
| 86 class MachCallJavaNode; | |
| 87 class MachCallLeafNode; | |
| 88 class MachCallNode; | |
| 89 class MachCallRuntimeNode; | |
| 90 class MachCallStaticJavaNode; | |
| 2008 | 91 class MachConstantBaseNode; |
| 92 class MachConstantNode; | |
| 3842 | 93 class MachGotoNode; |
| 0 | 94 class MachIfNode; |
| 95 class MachNode; | |
| 96 class MachNullCheckNode; | |
| 3842 | 97 class MachProjNode; |
| 0 | 98 class MachReturnNode; |
| 99 class MachSafePointNode; | |
| 100 class MachSpillCopyNode; | |
| 101 class MachTempNode; | |
| 102 class Matcher; | |
| 103 class MemBarNode; | |
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104 class MemBarStoreStoreNode; |
| 0 | 105 class MemNode; |
| 106 class MergeMemNode; | |
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107 class MulNode; |
| 0 | 108 class MultiNode; |
| 109 class MultiBranchNode; | |
| 110 class NeverBranchNode; | |
| 111 class Node; | |
| 112 class Node_Array; | |
| 113 class Node_List; | |
| 114 class Node_Stack; | |
| 115 class NullCheckNode; | |
| 116 class OopMap; | |
| 33 | 117 class ParmNode; |
| 0 | 118 class PCTableNode; |
| 119 class PhaseCCP; | |
| 120 class PhaseGVN; | |
| 121 class PhaseIterGVN; | |
| 122 class PhaseRegAlloc; | |
| 123 class PhaseTransform; | |
| 124 class PhaseValues; | |
| 125 class PhiNode; | |
| 126 class Pipeline; | |
| 127 class ProjNode; | |
| 128 class RegMask; | |
| 129 class RegionNode; | |
| 130 class RootNode; | |
| 131 class SafePointNode; | |
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132 class SafePointScalarObjectNode; |
| 0 | 133 class StartNode; |
| 134 class State; | |
| 135 class StoreNode; | |
| 136 class SubNode; | |
| 137 class Type; | |
| 138 class TypeNode; | |
| 139 class UnlockNode; | |
| 3842 | 140 class VectorNode; |
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141 class LoadVectorNode; |
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142 class StoreVectorNode; |
| 0 | 143 class VectorSet; |
| 144 typedef void (*NFunc)(Node&,void*); | |
| 145 extern "C" { | |
| 146 typedef int (*C_sort_func_t)(const void *, const void *); | |
| 147 } | |
| 148 | |
| 149 // The type of all node counts and indexes. | |
| 150 // It must hold at least 16 bits, but must also be fast to load and store. | |
| 151 // This type, if less than 32 bits, could limit the number of possible nodes. | |
| 152 // (To make this type platform-specific, move to globalDefinitions_xxx.hpp.) | |
| 153 typedef unsigned int node_idx_t; | |
| 154 | |
| 155 | |
| 156 #ifndef OPTO_DU_ITERATOR_ASSERT | |
| 157 #ifdef ASSERT | |
| 158 #define OPTO_DU_ITERATOR_ASSERT 1 | |
| 159 #else | |
| 160 #define OPTO_DU_ITERATOR_ASSERT 0 | |
| 161 #endif | |
| 162 #endif //OPTO_DU_ITERATOR_ASSERT | |
| 163 | |
| 164 #if OPTO_DU_ITERATOR_ASSERT | |
| 165 class DUIterator; | |
| 166 class DUIterator_Fast; | |
| 167 class DUIterator_Last; | |
| 168 #else | |
| 169 typedef uint DUIterator; | |
| 170 typedef Node** DUIterator_Fast; | |
| 171 typedef Node** DUIterator_Last; | |
| 172 #endif | |
| 173 | |
| 174 // Node Sentinel | |
| 175 #define NodeSentinel (Node*)-1 | |
| 176 | |
| 177 // Unknown count frequency | |
| 178 #define COUNT_UNKNOWN (-1.0f) | |
| 179 | |
| 180 //------------------------------Node------------------------------------------- | |
| 181 // Nodes define actions in the program. They create values, which have types. | |
| 182 // They are both vertices in a directed graph and program primitives. Nodes | |
| 183 // are labeled; the label is the "opcode", the primitive function in the lambda | |
| 184 // calculus sense that gives meaning to the Node. Node inputs are ordered (so | |
| 185 // that "a-b" is different from "b-a"). The inputs to a Node are the inputs to | |
| 186 // the Node's function. These inputs also define a Type equation for the Node. | |
| 187 // Solving these Type equations amounts to doing dataflow analysis. | |
| 188 // Control and data are uniformly represented in the graph. Finally, Nodes | |
| 189 // have a unique dense integer index which is used to index into side arrays | |
| 190 // whenever I have phase-specific information. | |
| 191 | |
| 192 class Node { | |
| 3939 | 193 friend class VMStructs; |
| 194 | |
| 0 | 195 // Lots of restrictions on cloning Nodes |
| 196 Node(const Node&); // not defined; linker error to use these | |
| 197 Node &operator=(const Node &rhs); | |
| 198 | |
| 199 public: | |
| 200 friend class Compile; | |
| 201 #if OPTO_DU_ITERATOR_ASSERT | |
| 202 friend class DUIterator_Common; | |
| 203 friend class DUIterator; | |
| 204 friend class DUIterator_Fast; | |
| 205 friend class DUIterator_Last; | |
| 206 #endif | |
| 207 | |
| 208 // Because Nodes come and go, I define an Arena of Node structures to pull | |
| 209 // from. This should allow fast access to node creation & deletion. This | |
| 210 // field is a local cache of a value defined in some "program fragment" for | |
| 211 // which these Nodes are just a part of. | |
| 212 | |
| 213 // New Operator that takes a Compile pointer, this will eventually | |
| 214 // be the "new" New operator. | |
| 215 inline void* operator new( size_t x, Compile* C) { | |
| 216 Node* n = (Node*)C->node_arena()->Amalloc_D(x); | |
| 217 #ifdef ASSERT | |
| 218 n->_in = (Node**)n; // magic cookie for assertion check | |
| 219 #endif | |
| 220 n->_out = (Node**)C; | |
| 221 return (void*)n; | |
| 222 } | |
| 223 | |
| 224 // Delete is a NOP | |
| 225 void operator delete( void *ptr ) {} | |
| 226 // Fancy destructor; eagerly attempt to reclaim Node numberings and storage | |
| 227 void destruct(); | |
| 228 | |
| 229 // Create a new Node. Required is the number is of inputs required for | |
| 230 // semantic correctness. | |
| 231 Node( uint required ); | |
| 232 | |
| 233 // Create a new Node with given input edges. | |
| 234 // This version requires use of the "edge-count" new. | |
| 235 // E.g. new (C,3) FooNode( C, NULL, left, right ); | |
| 236 Node( Node *n0 ); | |
| 237 Node( Node *n0, Node *n1 ); | |
| 238 Node( Node *n0, Node *n1, Node *n2 ); | |
| 239 Node( Node *n0, Node *n1, Node *n2, Node *n3 ); | |
| 240 Node( Node *n0, Node *n1, Node *n2, Node *n3, Node *n4 ); | |
| 241 Node( Node *n0, Node *n1, Node *n2, Node *n3, Node *n4, Node *n5 ); | |
| 242 Node( Node *n0, Node *n1, Node *n2, Node *n3, | |
| 243 Node *n4, Node *n5, Node *n6 ); | |
| 244 | |
| 245 // Clone an inherited Node given only the base Node type. | |
| 246 Node* clone() const; | |
| 247 | |
| 248 // Clone a Node, immediately supplying one or two new edges. | |
| 249 // The first and second arguments, if non-null, replace in(1) and in(2), | |
| 250 // respectively. | |
| 251 Node* clone_with_data_edge(Node* in1, Node* in2 = NULL) const { | |
| 252 Node* nn = clone(); | |
| 253 if (in1 != NULL) nn->set_req(1, in1); | |
| 254 if (in2 != NULL) nn->set_req(2, in2); | |
| 255 return nn; | |
| 256 } | |
| 257 | |
| 258 private: | |
| 259 // Shared setup for the above constructors. | |
| 260 // Handles all interactions with Compile::current. | |
| 261 // Puts initial values in all Node fields except _idx. | |
| 262 // Returns the initial value for _idx, which cannot | |
| 263 // be initialized by assignment. | |
| 264 inline int Init(int req, Compile* C); | |
| 265 | |
| 266 //----------------- input edge handling | |
| 267 protected: | |
| 268 friend class PhaseCFG; // Access to address of _in array elements | |
| 269 Node **_in; // Array of use-def references to Nodes | |
| 270 Node **_out; // Array of def-use references to Nodes | |
| 271 | |
| 605 | 272 // Input edges are split into two categories. Required edges are required |
| 0 | 273 // for semantic correctness; order is important and NULLs are allowed. |
| 274 // Precedence edges are used to help determine execution order and are | |
| 275 // added, e.g., for scheduling purposes. They are unordered and not | |
| 276 // duplicated; they have no embedded NULLs. Edges from 0 to _cnt-1 | |
| 277 // are required, from _cnt to _max-1 are precedence edges. | |
| 278 node_idx_t _cnt; // Total number of required Node inputs. | |
| 279 | |
| 280 node_idx_t _max; // Actual length of input array. | |
| 281 | |
| 282 // Output edges are an unordered list of def-use edges which exactly | |
| 283 // correspond to required input edges which point from other nodes | |
| 284 // to this one. Thus the count of the output edges is the number of | |
| 285 // users of this node. | |
| 286 node_idx_t _outcnt; // Total number of Node outputs. | |
| 287 | |
| 288 node_idx_t _outmax; // Actual length of output array. | |
| 289 | |
| 290 // Grow the actual input array to the next larger power-of-2 bigger than len. | |
| 291 void grow( uint len ); | |
| 292 // Grow the output array to the next larger power-of-2 bigger than len. | |
| 293 void out_grow( uint len ); | |
| 294 | |
| 295 public: | |
| 296 // Each Node is assigned a unique small/dense number. This number is used | |
| 297 // to index into auxiliary arrays of data and bitvectors. | |
| 298 // It is declared const to defend against inadvertant assignment, | |
| 299 // since it is used by clients as a naked field. | |
| 300 const node_idx_t _idx; | |
| 301 | |
| 302 // Get the (read-only) number of input edges | |
| 303 uint req() const { return _cnt; } | |
| 304 uint len() const { return _max; } | |
| 305 // Get the (read-only) number of output edges | |
| 306 uint outcnt() const { return _outcnt; } | |
| 307 | |
| 308 #if OPTO_DU_ITERATOR_ASSERT | |
| 309 // Iterate over the out-edges of this node. Deletions are illegal. | |
| 310 inline DUIterator outs() const; | |
| 311 // Use this when the out array might have changed to suppress asserts. | |
| 312 inline DUIterator& refresh_out_pos(DUIterator& i) const; | |
| 313 // Does the node have an out at this position? (Used for iteration.) | |
| 314 inline bool has_out(DUIterator& i) const; | |
| 315 inline Node* out(DUIterator& i) const; | |
| 316 // Iterate over the out-edges of this node. All changes are illegal. | |
| 317 inline DUIterator_Fast fast_outs(DUIterator_Fast& max) const; | |
| 318 inline Node* fast_out(DUIterator_Fast& i) const; | |
| 319 // Iterate over the out-edges of this node, deleting one at a time. | |
| 320 inline DUIterator_Last last_outs(DUIterator_Last& min) const; | |
| 321 inline Node* last_out(DUIterator_Last& i) const; | |
| 322 // The inline bodies of all these methods are after the iterator definitions. | |
| 323 #else | |
| 324 // Iterate over the out-edges of this node. Deletions are illegal. | |
| 325 // This iteration uses integral indexes, to decouple from array reallocations. | |
| 326 DUIterator outs() const { return 0; } | |
| 327 // Use this when the out array might have changed to suppress asserts. | |
| 328 DUIterator refresh_out_pos(DUIterator i) const { return i; } | |
| 329 | |
| 330 // Reference to the i'th output Node. Error if out of bounds. | |
| 331 Node* out(DUIterator i) const { assert(i < _outcnt, "oob"); return _out[i]; } | |
| 332 // Does the node have an out at this position? (Used for iteration.) | |
| 333 bool has_out(DUIterator i) const { return i < _outcnt; } | |
| 334 | |
| 335 // Iterate over the out-edges of this node. All changes are illegal. | |
| 336 // This iteration uses a pointer internal to the out array. | |
| 337 DUIterator_Fast fast_outs(DUIterator_Fast& max) const { | |
| 338 Node** out = _out; | |
| 339 // Assign a limit pointer to the reference argument: | |
| 340 max = out + (ptrdiff_t)_outcnt; | |
| 341 // Return the base pointer: | |
| 342 return out; | |
| 343 } | |
| 344 Node* fast_out(DUIterator_Fast i) const { return *i; } | |
| 345 // Iterate over the out-edges of this node, deleting one at a time. | |
| 346 // This iteration uses a pointer internal to the out array. | |
| 347 DUIterator_Last last_outs(DUIterator_Last& min) const { | |
| 348 Node** out = _out; | |
| 349 // Assign a limit pointer to the reference argument: | |
| 350 min = out; | |
| 351 // Return the pointer to the start of the iteration: | |
| 352 return out + (ptrdiff_t)_outcnt - 1; | |
| 353 } | |
| 354 Node* last_out(DUIterator_Last i) const { return *i; } | |
| 355 #endif | |
| 356 | |
| 357 // Reference to the i'th input Node. Error if out of bounds. | |
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358 Node* in(uint i) const { assert(i < _max, err_msg_res("oob: i=%d, _max=%d", i, _max)); return _in[i]; } |
| 0 | 359 // Reference to the i'th output Node. Error if out of bounds. |
| 360 // Use this accessor sparingly. We are going trying to use iterators instead. | |
| 361 Node* raw_out(uint i) const { assert(i < _outcnt,"oob"); return _out[i]; } | |
| 362 // Return the unique out edge. | |
| 363 Node* unique_out() const { assert(_outcnt==1,"not unique"); return _out[0]; } | |
| 364 // Delete out edge at position 'i' by moving last out edge to position 'i' | |
| 365 void raw_del_out(uint i) { | |
| 366 assert(i < _outcnt,"oob"); | |
| 367 assert(_outcnt > 0,"oob"); | |
| 368 #if OPTO_DU_ITERATOR_ASSERT | |
| 369 // Record that a change happened here. | |
| 370 debug_only(_last_del = _out[i]; ++_del_tick); | |
| 371 #endif | |
| 372 _out[i] = _out[--_outcnt]; | |
| 373 // Smash the old edge so it can't be used accidentally. | |
| 374 debug_only(_out[_outcnt] = (Node *)(uintptr_t)0xdeadbeef); | |
| 375 } | |
| 376 | |
| 377 #ifdef ASSERT | |
| 378 bool is_dead() const; | |
| 379 #define is_not_dead(n) ((n) == NULL || !VerifyIterativeGVN || !((n)->is_dead())) | |
| 380 #endif | |
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381 // Check whether node has become unreachable |
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382 bool is_unreachable(PhaseIterGVN &igvn) const; |
| 0 | 383 |
| 384 // Set a required input edge, also updates corresponding output edge | |
| 385 void add_req( Node *n ); // Append a NEW required input | |
| 386 void add_req_batch( Node* n, uint m ); // Append m NEW required inputs (all n). | |
| 387 void del_req( uint idx ); // Delete required edge & compact | |
| 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); | |
| 413 // NULL out all inputs to eliminate incoming Def-Use edges. | |
| 414 // Return the number of edges between 'n' and 'this' | |
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415 int disconnect_inputs(Node *n, Compile *c); |
| 0 | 416 |
| 417 // Quickly, return true if and only if I am Compile::current()->top(). | |
| 418 bool is_top() const { | |
| 419 assert((this == (Node*) Compile::current()->top()) == (_out == NULL), ""); | |
| 420 return (_out == NULL); | |
| 421 } | |
| 422 // Reaffirm invariants for is_top. (Only from Compile::set_cached_top_node.) | |
| 423 void setup_is_top(); | |
| 424 | |
| 425 // Strip away casting. (It is depth-limited.) | |
| 426 Node* uncast() const; | |
| 4778 | 427 // Return whether two Nodes are equivalent, after stripping casting. |
| 428 bool eqv_uncast(const Node* n) const { | |
| 429 return (this->uncast() == n->uncast()); | |
| 430 } | |
| 0 | 431 |
| 432 private: | |
| 433 static Node* uncast_helper(const Node* n); | |
| 434 | |
| 435 // Add an output edge to the end of the list | |
| 436 void add_out( Node *n ) { | |
| 437 if (is_top()) return; | |
| 438 if( _outcnt == _outmax ) out_grow(_outcnt); | |
| 439 _out[_outcnt++] = n; | |
| 440 } | |
| 441 // Delete an output edge | |
| 442 void del_out( Node *n ) { | |
| 443 if (is_top()) return; | |
| 444 Node** outp = &_out[_outcnt]; | |
| 445 // Find and remove n | |
| 446 do { | |
| 447 assert(outp > _out, "Missing Def-Use edge"); | |
| 448 } while (*--outp != n); | |
| 449 *outp = _out[--_outcnt]; | |
| 450 // Smash the old edge so it can't be used accidentally. | |
| 451 debug_only(_out[_outcnt] = (Node *)(uintptr_t)0xdeadbeef); | |
| 452 // Record that a change happened here. | |
| 453 #if OPTO_DU_ITERATOR_ASSERT | |
| 454 debug_only(_last_del = n; ++_del_tick); | |
| 455 #endif | |
| 456 } | |
| 457 | |
| 458 public: | |
| 459 // Globally replace this node by a given new node, updating all uses. | |
| 460 void replace_by(Node* new_node); | |
|
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461 // Globally replace this node by a given new node, updating all uses |
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462 // and cutting input edges of old node. |
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463 void subsume_by(Node* new_node, Compile* c) { |
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464 replace_by(new_node); |
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465 disconnect_inputs(NULL, c); |
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466 } |
| 0 | 467 void set_req_X( uint i, Node *n, PhaseIterGVN *igvn ); |
| 468 // Find the one non-null required input. RegionNode only | |
| 469 Node *nonnull_req() const; | |
| 470 // Add or remove precedence edges | |
| 471 void add_prec( Node *n ); | |
| 472 void rm_prec( uint i ); | |
| 473 void set_prec( uint i, Node *n ) { | |
| 474 assert( is_not_dead(n), "can not use dead node"); | |
| 475 assert( i >= _cnt, "not a precedence edge"); | |
| 476 if (_in[i] != NULL) _in[i]->del_out((Node *)this); | |
| 477 _in[i] = n; | |
| 478 if (n != NULL) n->add_out((Node *)this); | |
| 479 } | |
| 480 // Set this node's index, used by cisc_version to replace current node | |
| 481 void set_idx(uint new_idx) { | |
| 482 const node_idx_t* ref = &_idx; | |
| 483 *(node_idx_t*)ref = new_idx; | |
| 484 } | |
| 485 // Swap input edge order. (Edge indexes i1 and i2 are usually 1 and 2.) | |
| 486 void swap_edges(uint i1, uint i2) { | |
| 487 debug_only(uint check_hash = (VerifyHashTableKeys && _hash_lock) ? hash() : NO_HASH); | |
| 488 // Def-Use info is unchanged | |
| 489 Node* n1 = in(i1); | |
| 490 Node* n2 = in(i2); | |
| 491 _in[i1] = n2; | |
| 492 _in[i2] = n1; | |
| 493 // If this node is in the hash table, make sure it doesn't need a rehash. | |
| 494 assert(check_hash == NO_HASH || check_hash == hash(), "edge swap must preserve hash code"); | |
| 495 } | |
| 496 | |
| 497 // Iterators over input Nodes for a Node X are written as: | |
| 498 // for( i = 0; i < X.req(); i++ ) ... X[i] ... | |
| 499 // NOTE: Required edges can contain embedded NULL pointers. | |
| 500 | |
| 501 //----------------- Other Node Properties | |
| 502 | |
| 503 // Generate class id for some ideal nodes to avoid virtual query | |
| 504 // methods is_<Node>(). | |
| 505 // Class id is the set of bits corresponded to the node class and all its | |
| 506 // super classes so that queries for super classes are also valid. | |
| 507 // Subclasses of the same super class have different assigned bit | |
| 508 // (the third parameter in the macro DEFINE_CLASS_ID). | |
| 509 // Classes with deeper hierarchy are declared first. | |
| 510 // Classes with the same hierarchy depth are sorted by usage frequency. | |
| 511 // | |
| 512 // The query method masks the bits to cut off bits of subclasses | |
| 513 // and then compare the result with the class id | |
| 514 // (see the macro DEFINE_CLASS_QUERY below). | |
| 515 // | |
| 516 // Class_MachCall=30, ClassMask_MachCall=31 | |
| 517 // 12 8 4 0 | |
| 518 // 0 0 0 0 0 0 0 0 1 1 1 1 0 | |
| 519 // | | | | | |
| 520 // | | | Bit_Mach=2 | |
| 521 // | | Bit_MachReturn=4 | |
| 522 // | Bit_MachSafePoint=8 | |
| 523 // Bit_MachCall=16 | |
| 524 // | |
| 525 // Class_CountedLoop=56, ClassMask_CountedLoop=63 | |
| 526 // 12 8 4 0 | |
| 527 // 0 0 0 0 0 0 0 1 1 1 0 0 0 | |
| 528 // | | | | |
| 529 // | | Bit_Region=8 | |
| 530 // | Bit_Loop=16 | |
| 531 // Bit_CountedLoop=32 | |
| 532 | |
| 533 #define DEFINE_CLASS_ID(cl, supcl, subn) \ | |
| 534 Bit_##cl = (Class_##supcl == 0) ? 1 << subn : (Bit_##supcl) << (1 + subn) , \ | |
| 535 Class_##cl = Class_##supcl + Bit_##cl , \ | |
| 536 ClassMask_##cl = ((Bit_##cl << 1) - 1) , | |
| 537 | |
| 538 // This enum is used only for C2 ideal and mach nodes with is_<node>() methods | |
| 539 // so that it's values fits into 16 bits. | |
| 540 enum NodeClasses { | |
| 541 Bit_Node = 0x0000, | |
| 542 Class_Node = 0x0000, | |
| 543 ClassMask_Node = 0xFFFF, | |
| 544 | |
| 545 DEFINE_CLASS_ID(Multi, Node, 0) | |
| 546 DEFINE_CLASS_ID(SafePoint, Multi, 0) | |
| 547 DEFINE_CLASS_ID(Call, SafePoint, 0) | |
| 548 DEFINE_CLASS_ID(CallJava, Call, 0) | |
| 549 DEFINE_CLASS_ID(CallStaticJava, CallJava, 0) | |
| 550 DEFINE_CLASS_ID(CallDynamicJava, CallJava, 1) | |
| 551 DEFINE_CLASS_ID(CallRuntime, Call, 1) | |
| 552 DEFINE_CLASS_ID(CallLeaf, CallRuntime, 0) | |
| 553 DEFINE_CLASS_ID(Allocate, Call, 2) | |
| 554 DEFINE_CLASS_ID(AllocateArray, Allocate, 0) | |
| 555 DEFINE_CLASS_ID(AbstractLock, Call, 3) | |
| 556 DEFINE_CLASS_ID(Lock, AbstractLock, 0) | |
| 557 DEFINE_CLASS_ID(Unlock, AbstractLock, 1) | |
| 558 DEFINE_CLASS_ID(MultiBranch, Multi, 1) | |
| 559 DEFINE_CLASS_ID(PCTable, MultiBranch, 0) | |
| 560 DEFINE_CLASS_ID(Catch, PCTable, 0) | |
| 561 DEFINE_CLASS_ID(Jump, PCTable, 1) | |
| 562 DEFINE_CLASS_ID(If, MultiBranch, 1) | |
| 563 DEFINE_CLASS_ID(CountedLoopEnd, If, 0) | |
| 564 DEFINE_CLASS_ID(NeverBranch, MultiBranch, 2) | |
| 565 DEFINE_CLASS_ID(Start, Multi, 2) | |
| 566 DEFINE_CLASS_ID(MemBar, Multi, 3) | |
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567 DEFINE_CLASS_ID(Initialize, MemBar, 0) |
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568 DEFINE_CLASS_ID(MemBarStoreStore, MemBar, 1) |
| 0 | 569 |
| 570 DEFINE_CLASS_ID(Mach, Node, 1) | |
| 571 DEFINE_CLASS_ID(MachReturn, Mach, 0) | |
| 572 DEFINE_CLASS_ID(MachSafePoint, MachReturn, 0) | |
| 573 DEFINE_CLASS_ID(MachCall, MachSafePoint, 0) | |
| 574 DEFINE_CLASS_ID(MachCallJava, MachCall, 0) | |
| 575 DEFINE_CLASS_ID(MachCallStaticJava, MachCallJava, 0) | |
| 576 DEFINE_CLASS_ID(MachCallDynamicJava, MachCallJava, 1) | |
| 577 DEFINE_CLASS_ID(MachCallRuntime, MachCall, 1) | |
| 578 DEFINE_CLASS_ID(MachCallLeaf, MachCallRuntime, 0) | |
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579 DEFINE_CLASS_ID(MachBranch, Mach, 1) |
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580 DEFINE_CLASS_ID(MachIf, MachBranch, 0) |
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581 DEFINE_CLASS_ID(MachGoto, MachBranch, 1) |
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582 DEFINE_CLASS_ID(MachNullCheck, MachBranch, 2) |
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583 DEFINE_CLASS_ID(MachSpillCopy, Mach, 2) |
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584 DEFINE_CLASS_ID(MachTemp, Mach, 3) |
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585 DEFINE_CLASS_ID(MachConstantBase, Mach, 4) |
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586 DEFINE_CLASS_ID(MachConstant, Mach, 5) |
| 0 | 587 |
| 3842 | 588 DEFINE_CLASS_ID(Type, Node, 2) |
| 0 | 589 DEFINE_CLASS_ID(Phi, Type, 0) |
| 590 DEFINE_CLASS_ID(ConstraintCast, Type, 1) | |
| 591 DEFINE_CLASS_ID(CheckCastPP, Type, 2) | |
| 592 DEFINE_CLASS_ID(CMove, Type, 3) | |
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593 DEFINE_CLASS_ID(SafePointScalarObject, Type, 4) |
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594 DEFINE_CLASS_ID(DecodeNarrowPtr, Type, 5) |
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595 DEFINE_CLASS_ID(DecodeN, DecodeNarrowPtr, 0) |
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596 DEFINE_CLASS_ID(DecodeNKlass, DecodeNarrowPtr, 1) |
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597 DEFINE_CLASS_ID(EncodeNarrowPtr, Type, 6) |
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598 DEFINE_CLASS_ID(EncodeP, EncodeNarrowPtr, 0) |
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599 DEFINE_CLASS_ID(EncodePKlass, EncodeNarrowPtr, 1) |
| 0 | 600 |
| 3842 | 601 DEFINE_CLASS_ID(Proj, Node, 3) |
| 602 DEFINE_CLASS_ID(CatchProj, Proj, 0) | |
| 603 DEFINE_CLASS_ID(JumpProj, Proj, 1) | |
| 604 DEFINE_CLASS_ID(IfTrue, Proj, 2) | |
| 605 DEFINE_CLASS_ID(IfFalse, Proj, 3) | |
| 606 DEFINE_CLASS_ID(Parm, Proj, 4) | |
| 607 DEFINE_CLASS_ID(MachProj, Proj, 5) | |
| 608 | |
| 609 DEFINE_CLASS_ID(Mem, Node, 4) | |
| 0 | 610 DEFINE_CLASS_ID(Load, Mem, 0) |
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611 DEFINE_CLASS_ID(LoadVector, Load, 0) |
| 0 | 612 DEFINE_CLASS_ID(Store, Mem, 1) |
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613 DEFINE_CLASS_ID(StoreVector, Store, 0) |
| 0 | 614 DEFINE_CLASS_ID(LoadStore, Mem, 2) |
| 615 | |
| 3842 | 616 DEFINE_CLASS_ID(Region, Node, 5) |
| 617 DEFINE_CLASS_ID(Loop, Region, 0) | |
| 618 DEFINE_CLASS_ID(Root, Loop, 0) | |
| 619 DEFINE_CLASS_ID(CountedLoop, Loop, 1) | |
| 620 | |
| 621 DEFINE_CLASS_ID(Sub, Node, 6) | |
| 622 DEFINE_CLASS_ID(Cmp, Sub, 0) | |
| 623 DEFINE_CLASS_ID(FastLock, Cmp, 0) | |
| 624 DEFINE_CLASS_ID(FastUnlock, Cmp, 1) | |
| 625 | |
| 0 | 626 DEFINE_CLASS_ID(MergeMem, Node, 7) |
| 627 DEFINE_CLASS_ID(Bool, Node, 8) | |
| 628 DEFINE_CLASS_ID(AddP, Node, 9) | |
| 629 DEFINE_CLASS_ID(BoxLock, Node, 10) | |
| 630 DEFINE_CLASS_ID(Add, Node, 11) | |
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631 DEFINE_CLASS_ID(Mul, Node, 12) |
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632 DEFINE_CLASS_ID(Vector, Node, 13) |
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633 DEFINE_CLASS_ID(ClearArray, Node, 14) |
| 0 | 634 |
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635 _max_classes = ClassMask_ClearArray |
| 0 | 636 }; |
| 637 #undef DEFINE_CLASS_ID | |
| 638 | |
| 639 // Flags are sorted by usage frequency. | |
| 640 enum NodeFlags { | |
| 641 Flag_is_Copy = 0x01, // should be first bit to avoid shift | |
| 3842 | 642 Flag_rematerialize = Flag_is_Copy << 1, |
| 0 | 643 Flag_needs_anti_dependence_check = Flag_rematerialize << 1, |
| 644 Flag_is_macro = Flag_needs_anti_dependence_check << 1, | |
| 645 Flag_is_Con = Flag_is_macro << 1, | |
| 646 Flag_is_cisc_alternate = Flag_is_Con << 1, | |
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647 Flag_is_dead_loop_safe = Flag_is_cisc_alternate << 1, |
| 0 | 648 Flag_may_be_short_branch = Flag_is_dead_loop_safe << 1, |
| 3851 | 649 Flag_avoid_back_to_back = Flag_may_be_short_branch << 1, |
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650 Flag_has_call = Flag_avoid_back_to_back << 1, |
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651 Flag_is_expensive = Flag_has_call << 1, |
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652 _max_flags = (Flag_is_expensive << 1) - 1 // allow flags combination |
| 0 | 653 }; |
| 654 | |
| 655 private: | |
| 656 jushort _class_id; | |
| 657 jushort _flags; | |
| 658 | |
| 659 protected: | |
| 660 // These methods should be called from constructors only. | |
| 661 void init_class_id(jushort c) { | |
| 662 assert(c <= _max_classes, "invalid node class"); | |
| 663 _class_id = c; // cast out const | |
| 664 } | |
| 665 void init_flags(jushort fl) { | |
| 666 assert(fl <= _max_flags, "invalid node flag"); | |
| 667 _flags |= fl; | |
| 668 } | |
| 669 void clear_flag(jushort fl) { | |
| 670 assert(fl <= _max_flags, "invalid node flag"); | |
| 671 _flags &= ~fl; | |
| 672 } | |
| 673 | |
| 674 public: | |
| 675 const jushort class_id() const { return _class_id; } | |
| 676 | |
| 677 const jushort flags() const { return _flags; } | |
| 678 | |
| 679 // Return a dense integer opcode number | |
| 680 virtual int Opcode() const; | |
| 681 | |
| 682 // Virtual inherited Node size | |
| 683 virtual uint size_of() const; | |
| 684 | |
| 685 // Other interesting Node properties | |
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686 #define DEFINE_CLASS_QUERY(type) \ |
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687 bool is_##type() const { \ |
| 0 | 688 return ((_class_id & ClassMask_##type) == Class_##type); \ |
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689 } \ |
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690 type##Node *as_##type() const { \ |
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691 assert(is_##type(), "invalid node class"); \ |
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692 return (type##Node*)this; \ |
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693 } \ |
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694 type##Node* isa_##type() const { \ |
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695 return (is_##type()) ? as_##type() : NULL; \ |
| 0 | 696 } |
| 697 | |
| 698 DEFINE_CLASS_QUERY(AbstractLock) | |
| 699 DEFINE_CLASS_QUERY(Add) | |
| 700 DEFINE_CLASS_QUERY(AddP) | |
| 701 DEFINE_CLASS_QUERY(Allocate) | |
| 702 DEFINE_CLASS_QUERY(AllocateArray) | |
| 703 DEFINE_CLASS_QUERY(Bool) | |
| 704 DEFINE_CLASS_QUERY(BoxLock) | |
| 3842 | 705 DEFINE_CLASS_QUERY(Call) |
| 0 | 706 DEFINE_CLASS_QUERY(CallDynamicJava) |
| 707 DEFINE_CLASS_QUERY(CallJava) | |
| 708 DEFINE_CLASS_QUERY(CallLeaf) | |
| 709 DEFINE_CLASS_QUERY(CallRuntime) | |
| 710 DEFINE_CLASS_QUERY(CallStaticJava) | |
| 711 DEFINE_CLASS_QUERY(Catch) | |
| 712 DEFINE_CLASS_QUERY(CatchProj) | |
| 713 DEFINE_CLASS_QUERY(CheckCastPP) | |
| 714 DEFINE_CLASS_QUERY(ConstraintCast) | |
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715 DEFINE_CLASS_QUERY(ClearArray) |
| 0 | 716 DEFINE_CLASS_QUERY(CMove) |
| 717 DEFINE_CLASS_QUERY(Cmp) | |
| 718 DEFINE_CLASS_QUERY(CountedLoop) | |
| 719 DEFINE_CLASS_QUERY(CountedLoopEnd) | |
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720 DEFINE_CLASS_QUERY(DecodeNarrowPtr) |
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721 DEFINE_CLASS_QUERY(DecodeN) |
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722 DEFINE_CLASS_QUERY(DecodeNKlass) |
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723 DEFINE_CLASS_QUERY(EncodeNarrowPtr) |
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724 DEFINE_CLASS_QUERY(EncodeP) |
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725 DEFINE_CLASS_QUERY(EncodePKlass) |
| 0 | 726 DEFINE_CLASS_QUERY(FastLock) |
| 727 DEFINE_CLASS_QUERY(FastUnlock) | |
| 728 DEFINE_CLASS_QUERY(If) | |
| 729 DEFINE_CLASS_QUERY(IfFalse) | |
| 730 DEFINE_CLASS_QUERY(IfTrue) | |
| 731 DEFINE_CLASS_QUERY(Initialize) | |
| 732 DEFINE_CLASS_QUERY(Jump) | |
| 733 DEFINE_CLASS_QUERY(JumpProj) | |
| 734 DEFINE_CLASS_QUERY(Load) | |
| 735 DEFINE_CLASS_QUERY(LoadStore) | |
| 736 DEFINE_CLASS_QUERY(Lock) | |
| 737 DEFINE_CLASS_QUERY(Loop) | |
| 738 DEFINE_CLASS_QUERY(Mach) | |
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739 DEFINE_CLASS_QUERY(MachBranch) |
| 0 | 740 DEFINE_CLASS_QUERY(MachCall) |
| 741 DEFINE_CLASS_QUERY(MachCallDynamicJava) | |
| 742 DEFINE_CLASS_QUERY(MachCallJava) | |
| 743 DEFINE_CLASS_QUERY(MachCallLeaf) | |
| 744 DEFINE_CLASS_QUERY(MachCallRuntime) | |
| 745 DEFINE_CLASS_QUERY(MachCallStaticJava) | |
| 2008 | 746 DEFINE_CLASS_QUERY(MachConstantBase) |
| 747 DEFINE_CLASS_QUERY(MachConstant) | |
| 3842 | 748 DEFINE_CLASS_QUERY(MachGoto) |
| 0 | 749 DEFINE_CLASS_QUERY(MachIf) |
| 750 DEFINE_CLASS_QUERY(MachNullCheck) | |
| 3842 | 751 DEFINE_CLASS_QUERY(MachProj) |
| 0 | 752 DEFINE_CLASS_QUERY(MachReturn) |
| 753 DEFINE_CLASS_QUERY(MachSafePoint) | |
| 754 DEFINE_CLASS_QUERY(MachSpillCopy) | |
| 755 DEFINE_CLASS_QUERY(MachTemp) | |
| 756 DEFINE_CLASS_QUERY(Mem) | |
| 757 DEFINE_CLASS_QUERY(MemBar) | |
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758 DEFINE_CLASS_QUERY(MemBarStoreStore) |
| 0 | 759 DEFINE_CLASS_QUERY(MergeMem) |
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760 DEFINE_CLASS_QUERY(Mul) |
| 0 | 761 DEFINE_CLASS_QUERY(Multi) |
| 762 DEFINE_CLASS_QUERY(MultiBranch) | |
| 33 | 763 DEFINE_CLASS_QUERY(Parm) |
| 0 | 764 DEFINE_CLASS_QUERY(PCTable) |
| 765 DEFINE_CLASS_QUERY(Phi) | |
| 766 DEFINE_CLASS_QUERY(Proj) | |
| 767 DEFINE_CLASS_QUERY(Region) | |
| 768 DEFINE_CLASS_QUERY(Root) | |
| 769 DEFINE_CLASS_QUERY(SafePoint) | |
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770 DEFINE_CLASS_QUERY(SafePointScalarObject) |
| 0 | 771 DEFINE_CLASS_QUERY(Start) |
| 772 DEFINE_CLASS_QUERY(Store) | |
| 773 DEFINE_CLASS_QUERY(Sub) | |
| 774 DEFINE_CLASS_QUERY(Type) | |
| 3842 | 775 DEFINE_CLASS_QUERY(Vector) |
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776 DEFINE_CLASS_QUERY(LoadVector) |
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777 DEFINE_CLASS_QUERY(StoreVector) |
| 0 | 778 DEFINE_CLASS_QUERY(Unlock) |
| 779 | |
| 780 #undef DEFINE_CLASS_QUERY | |
| 781 | |
| 782 // duplicate of is_MachSpillCopy() | |
| 783 bool is_SpillCopy () const { | |
| 784 return ((_class_id & ClassMask_MachSpillCopy) == Class_MachSpillCopy); | |
| 785 } | |
| 786 | |
| 787 bool is_Con () const { return (_flags & Flag_is_Con) != 0; } | |
| 788 // The data node which is safe to leave in dead loop during IGVN optimization. | |
| 789 bool is_dead_loop_safe() const { | |
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790 return is_Phi() || (is_Proj() && in(0) == NULL) || |
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791 ((_flags & (Flag_is_dead_loop_safe | Flag_is_Con)) != 0 && |
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792 (!is_Proj() || !in(0)->is_Allocate())); |
| 0 | 793 } |
| 794 | |
| 795 // is_Copy() returns copied edge index (0 or 1) | |
| 796 uint is_Copy() const { return (_flags & Flag_is_Copy); } | |
| 797 | |
| 798 virtual bool is_CFG() const { return false; } | |
| 799 | |
| 800 // If this node is control-dependent on a test, can it be | |
| 801 // rerouted to a dominating equivalent test? This is usually | |
| 802 // true of non-CFG nodes, but can be false for operations which | |
| 803 // depend for their correct sequencing on more than one test. | |
| 804 // (In that case, hoisting to a dominating test may silently | |
| 805 // skip some other important test.) | |
| 806 virtual bool depends_only_on_test() const { assert(!is_CFG(), ""); return true; }; | |
| 807 | |
| 808 // When building basic blocks, I need to have a notion of block beginning | |
| 809 // Nodes, next block selector Nodes (block enders), and next block | |
| 810 // projections. These calls need to work on their machine equivalents. The | |
| 811 // Ideal beginning Nodes are RootNode, RegionNode and StartNode. | |
| 812 bool is_block_start() const { | |
| 813 if ( is_Region() ) | |
| 814 return this == (const Node*)in(0); | |
| 815 else | |
| 3842 | 816 return is_Start(); |
| 0 | 817 } |
| 818 | |
| 819 // The Ideal control projection Nodes are IfTrue/IfFalse, JumpProjNode, Root, | |
| 820 // Goto and Return. This call also returns the block ending Node. | |
| 821 virtual const Node *is_block_proj() const; | |
| 822 | |
| 823 // The node is a "macro" node which needs to be expanded before matching | |
| 824 bool is_macro() const { return (_flags & Flag_is_macro) != 0; } | |
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825 // The node is expensive: the best control is set during loop opts |
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826 bool is_expensive() const { return (_flags & Flag_is_expensive) != 0 && in(0) != NULL; } |
| 0 | 827 |
| 828 //----------------- Optimization | |
| 829 | |
| 830 // Get the worst-case Type output for this Node. | |
| 831 virtual const class Type *bottom_type() const; | |
| 832 | |
| 833 // If we find a better type for a node, try to record it permanently. | |
| 834 // Return true if this node actually changed. | |
| 835 // Be sure to do the hash_delete game in the "rehash" variant. | |
| 836 void raise_bottom_type(const Type* new_type); | |
| 837 | |
| 838 // Get the address type with which this node uses and/or defs memory, | |
| 839 // or NULL if none. The address type is conservatively wide. | |
| 840 // Returns non-null for calls, membars, loads, stores, etc. | |
| 841 // Returns TypePtr::BOTTOM if the node touches memory "broadly". | |
| 842 virtual const class TypePtr *adr_type() const { return NULL; } | |
| 843 | |
| 844 // Return an existing node which computes the same function as this node. | |
| 845 // The optimistic combined algorithm requires this to return a Node which | |
| 846 // is a small number of steps away (e.g., one of my inputs). | |
| 847 virtual Node *Identity( PhaseTransform *phase ); | |
| 848 | |
| 849 // Return the set of values this Node can take on at runtime. | |
| 850 virtual const Type *Value( PhaseTransform *phase ) const; | |
| 851 | |
| 852 // Return a node which is more "ideal" than the current node. | |
| 853 // The invariants on this call are subtle. If in doubt, read the | |
| 854 // treatise in node.cpp above the default implemention AND TEST WITH | |
| 855 // +VerifyIterativeGVN! | |
| 856 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 857 | |
| 858 // Some nodes have specific Ideal subgraph transformations only if they are | |
| 859 // unique users of specific nodes. Such nodes should be put on IGVN worklist | |
| 860 // for the transformations to happen. | |
| 861 bool has_special_unique_user() const; | |
| 862 | |
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863 // Skip Proj and CatchProj nodes chains. Check for Null and Top. |
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864 Node* find_exact_control(Node* ctrl); |
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865 |
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866 // Check if 'this' node dominates or equal to 'sub'. |
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867 bool dominates(Node* sub, Node_List &nlist); |
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868 |
| 0 | 869 protected: |
| 870 bool remove_dead_region(PhaseGVN *phase, bool can_reshape); | |
| 871 public: | |
| 872 | |
| 873 // Idealize graph, using DU info. Done after constant propagation | |
| 874 virtual Node *Ideal_DU_postCCP( PhaseCCP *ccp ); | |
| 875 | |
| 876 // See if there is valid pipeline info | |
| 877 static const Pipeline *pipeline_class(); | |
| 878 virtual const Pipeline *pipeline() const; | |
| 879 | |
| 880 // Compute the latency from the def to this instruction of the ith input node | |
| 881 uint latency(uint i); | |
| 882 | |
| 883 // Hash & compare functions, for pessimistic value numbering | |
| 884 | |
| 885 // If the hash function returns the special sentinel value NO_HASH, | |
| 886 // the node is guaranteed never to compare equal to any other node. | |
| 605 | 887 // If we accidentally generate a hash with value NO_HASH the node |
| 0 | 888 // won't go into the table and we'll lose a little optimization. |
| 889 enum { NO_HASH = 0 }; | |
| 890 virtual uint hash() const; | |
| 891 virtual uint cmp( const Node &n ) const; | |
| 892 | |
| 893 // Operation appears to be iteratively computed (such as an induction variable) | |
| 894 // It is possible for this operation to return false for a loop-varying | |
| 895 // value, if it appears (by local graph inspection) to be computed by a simple conditional. | |
| 896 bool is_iteratively_computed(); | |
| 897 | |
| 898 // Determine if a node is Counted loop induction variable. | |
| 899 // The method is defined in loopnode.cpp. | |
| 900 const Node* is_loop_iv() const; | |
| 901 | |
| 902 // Return a node with opcode "opc" and same inputs as "this" if one can | |
| 903 // be found; Otherwise return NULL; | |
| 904 Node* find_similar(int opc); | |
| 905 | |
| 906 // Return the unique control out if only one. Null if none or more than one. | |
| 907 Node* unique_ctrl_out(); | |
| 908 | |
| 909 //----------------- Code Generation | |
| 910 | |
| 911 // Ideal register class for Matching. Zero means unmatched instruction | |
| 912 // (these are cloned instead of converted to machine nodes). | |
| 913 virtual uint ideal_reg() const; | |
| 914 | |
| 915 static const uint NotAMachineReg; // must be > max. machine register | |
| 916 | |
| 917 // Do we Match on this edge index or not? Generally false for Control | |
| 918 // and true for everything else. Weird for calls & returns. | |
| 919 virtual uint match_edge(uint idx) const; | |
| 920 | |
| 921 // Register class output is returned in | |
| 922 virtual const RegMask &out_RegMask() const; | |
| 923 // Register class input is expected in | |
| 924 virtual const RegMask &in_RegMask(uint) const; | |
| 925 // Should we clone rather than spill this instruction? | |
| 926 bool rematerialize() const; | |
| 927 | |
| 928 // Return JVM State Object if this Node carries debug info, or NULL otherwise | |
| 929 virtual JVMState* jvms() const; | |
| 930 | |
| 931 // Print as assembly | |
| 932 virtual void format( PhaseRegAlloc *, outputStream* st = tty ) const; | |
| 933 // Emit bytes starting at parameter 'ptr' | |
| 934 // Bump 'ptr' by the number of output bytes | |
| 935 virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const; | |
| 936 // Size of instruction in bytes | |
| 937 virtual uint size(PhaseRegAlloc *ra_) const; | |
| 938 | |
| 939 // Convenience function to extract an integer constant from a node. | |
| 940 // If it is not an integer constant (either Con, CastII, or Mach), | |
| 941 // return value_if_unknown. | |
| 942 jint find_int_con(jint value_if_unknown) const { | |
| 943 const TypeInt* t = find_int_type(); | |
| 944 return (t != NULL && t->is_con()) ? t->get_con() : value_if_unknown; | |
| 945 } | |
| 946 // Return the constant, knowing it is an integer constant already | |
| 947 jint get_int() const { | |
| 948 const TypeInt* t = find_int_type(); | |
| 949 guarantee(t != NULL, "must be con"); | |
| 950 return t->get_con(); | |
| 951 } | |
| 952 // Here's where the work is done. Can produce non-constant int types too. | |
| 953 const TypeInt* find_int_type() const; | |
| 954 | |
| 955 // Same thing for long (and intptr_t, via type.hpp): | |
| 956 jlong get_long() const { | |
| 957 const TypeLong* t = find_long_type(); | |
| 958 guarantee(t != NULL, "must be con"); | |
| 959 return t->get_con(); | |
| 960 } | |
| 961 jlong find_long_con(jint value_if_unknown) const { | |
| 962 const TypeLong* t = find_long_type(); | |
| 963 return (t != NULL && t->is_con()) ? t->get_con() : value_if_unknown; | |
| 964 } | |
| 965 const TypeLong* find_long_type() const; | |
| 966 | |
| 967 // These guys are called by code generated by ADLC: | |
| 968 intptr_t get_ptr() const; | |
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969 intptr_t get_narrowcon() const; |
| 0 | 970 jdouble getd() const; |
| 971 jfloat getf() const; | |
| 972 | |
| 973 // Nodes which are pinned into basic blocks | |
| 974 virtual bool pinned() const { return false; } | |
| 975 | |
| 976 // Nodes which use memory without consuming it, hence need antidependences | |
| 977 // More specifically, needs_anti_dependence_check returns true iff the node | |
| 978 // (a) does a load, and (b) does not perform a store (except perhaps to a | |
| 979 // stack slot or some other unaliased location). | |
| 980 bool needs_anti_dependence_check() const; | |
| 981 | |
| 982 // Return which operand this instruction may cisc-spill. In other words, | |
| 983 // return operand position that can convert from reg to memory access | |
| 984 virtual int cisc_operand() const { return AdlcVMDeps::Not_cisc_spillable; } | |
| 985 bool is_cisc_alternate() const { return (_flags & Flag_is_cisc_alternate) != 0; } | |
| 986 | |
| 987 //----------------- Graph walking | |
| 988 public: | |
| 989 // Walk and apply member functions recursively. | |
| 990 // Supplied (this) pointer is root. | |
| 991 void walk(NFunc pre, NFunc post, void *env); | |
| 992 static void nop(Node &, void*); // Dummy empty function | |
| 993 static void packregion( Node &n, void* ); | |
| 994 private: | |
| 995 void walk_(NFunc pre, NFunc post, void *env, VectorSet &visited); | |
| 996 | |
| 997 //----------------- Printing, etc | |
| 998 public: | |
| 999 #ifndef PRODUCT | |
| 1000 Node* find(int idx) const; // Search the graph for the given idx. | |
| 1001 Node* find_ctrl(int idx) const; // Search control ancestors for the given idx. | |
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1002 void dump() const { dump("\n"); } // Print this node. |
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1003 void dump(const char* suffix, outputStream *st = tty) const;// Print this node. |
| 0 | 1004 void dump(int depth) const; // Print this node, recursively to depth d |
| 1005 void dump_ctrl(int depth) const; // Print control nodes, to depth d | |
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1006 virtual void dump_req(outputStream *st = tty) const; // Print required-edge info |
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1007 virtual void dump_prec(outputStream *st = tty) const; // Print precedence-edge info |
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1008 virtual void dump_out(outputStream *st = tty) const; // Print the output edge info |
| 0 | 1009 virtual void dump_spec(outputStream *st) const {}; // Print per-node info |
| 1010 void verify_edges(Unique_Node_List &visited); // Verify bi-directional edges | |
| 1011 void verify() const; // Check Def-Use info for my subgraph | |
| 1012 static void verify_recur(const Node *n, int verify_depth, VectorSet &old_space, VectorSet &new_space); | |
| 1013 | |
| 1014 // This call defines a class-unique string used to identify class instances | |
| 1015 virtual const char *Name() const; | |
| 1016 | |
| 1017 void dump_format(PhaseRegAlloc *ra) const; // debug access to MachNode::format(...) | |
| 1018 // RegMask Print Functions | |
| 1019 void dump_in_regmask(int idx) { in_RegMask(idx).dump(); } | |
| 1020 void dump_out_regmask() { out_RegMask().dump(); } | |
| 1021 static int _in_dump_cnt; | |
| 1022 static bool in_dump() { return _in_dump_cnt > 0; } | |
| 1023 void fast_dump() const { | |
| 1024 tty->print("%4d: %-17s", _idx, Name()); | |
| 1025 for (uint i = 0; i < len(); i++) | |
| 1026 if (in(i)) | |
| 1027 tty->print(" %4d", in(i)->_idx); | |
| 1028 else | |
| 1029 tty->print(" NULL"); | |
| 1030 tty->print("\n"); | |
| 1031 } | |
| 1032 #endif | |
| 1033 #ifdef ASSERT | |
| 1034 void verify_construction(); | |
| 1035 bool verify_jvms(const JVMState* jvms) const; | |
| 1036 int _debug_idx; // Unique value assigned to every node. | |
| 1037 int debug_idx() const { return _debug_idx; } | |
| 1038 void set_debug_idx( int debug_idx ) { _debug_idx = debug_idx; } | |
| 1039 | |
| 1040 Node* _debug_orig; // Original version of this, if any. | |
| 1041 Node* debug_orig() const { return _debug_orig; } | |
| 1042 void set_debug_orig(Node* orig); // _debug_orig = orig | |
| 1043 | |
| 1044 int _hash_lock; // Barrier to modifications of nodes in the hash table | |
| 1045 void enter_hash_lock() { ++_hash_lock; assert(_hash_lock < 99, "in too many hash tables?"); } | |
| 1046 void exit_hash_lock() { --_hash_lock; assert(_hash_lock >= 0, "mispaired hash locks"); } | |
| 1047 | |
| 1048 static void init_NodeProperty(); | |
| 1049 | |
| 1050 #if OPTO_DU_ITERATOR_ASSERT | |
| 1051 const Node* _last_del; // The last deleted node. | |
| 1052 uint _del_tick; // Bumped when a deletion happens.. | |
| 1053 #endif | |
| 1054 #endif | |
| 1055 }; | |
| 1056 | |
| 1057 //----------------------------------------------------------------------------- | |
| 1058 // Iterators over DU info, and associated Node functions. | |
| 1059 | |
| 1060 #if OPTO_DU_ITERATOR_ASSERT | |
| 1061 | |
| 1062 // Common code for assertion checking on DU iterators. | |
| 1063 class DUIterator_Common VALUE_OBJ_CLASS_SPEC { | |
| 1064 #ifdef ASSERT | |
| 1065 protected: | |
| 1066 bool _vdui; // cached value of VerifyDUIterators | |
| 1067 const Node* _node; // the node containing the _out array | |
| 1068 uint _outcnt; // cached node->_outcnt | |
| 1069 uint _del_tick; // cached node->_del_tick | |
| 1070 Node* _last; // last value produced by the iterator | |
| 1071 | |
| 1072 void sample(const Node* node); // used by c'tor to set up for verifies | |
| 1073 void verify(const Node* node, bool at_end_ok = false); | |
| 1074 void verify_resync(); | |
| 1075 void reset(const DUIterator_Common& that); | |
| 1076 | |
| 1077 // The VDUI_ONLY macro protects code conditionalized on VerifyDUIterators | |
| 1078 #define I_VDUI_ONLY(i,x) { if ((i)._vdui) { x; } } | |
| 1079 #else | |
| 1080 #define I_VDUI_ONLY(i,x) { } | |
| 1081 #endif //ASSERT | |
| 1082 }; | |
| 1083 | |
| 1084 #define VDUI_ONLY(x) I_VDUI_ONLY(*this, x) | |
| 1085 | |
| 1086 // Default DU iterator. Allows appends onto the out array. | |
| 1087 // Allows deletion from the out array only at the current point. | |
| 1088 // Usage: | |
| 1089 // for (DUIterator i = x->outs(); x->has_out(i); i++) { | |
| 1090 // Node* y = x->out(i); | |
| 1091 // ... | |
| 1092 // } | |
| 1093 // Compiles in product mode to a unsigned integer index, which indexes | |
| 1094 // onto a repeatedly reloaded base pointer of x->_out. The loop predicate | |
| 1095 // also reloads x->_outcnt. If you delete, you must perform "--i" just | |
| 1096 // before continuing the loop. You must delete only the last-produced | |
| 1097 // edge. You must delete only a single copy of the last-produced edge, | |
| 1098 // or else you must delete all copies at once (the first time the edge | |
| 1099 // is produced by the iterator). | |
| 1100 class DUIterator : public DUIterator_Common { | |
| 1101 friend class Node; | |
| 1102 | |
| 1103 // This is the index which provides the product-mode behavior. | |
| 1104 // Whatever the product-mode version of the system does to the | |
| 1105 // DUI index is done to this index. All other fields in | |
| 1106 // this class are used only for assertion checking. | |
| 1107 uint _idx; | |
| 1108 | |
| 1109 #ifdef ASSERT | |
| 1110 uint _refresh_tick; // Records the refresh activity. | |
| 1111 | |
| 1112 void sample(const Node* node); // Initialize _refresh_tick etc. | |
| 1113 void verify(const Node* node, bool at_end_ok = false); | |
| 1114 void verify_increment(); // Verify an increment operation. | |
| 1115 void verify_resync(); // Verify that we can back up over a deletion. | |
| 1116 void verify_finish(); // Verify that the loop terminated properly. | |
| 1117 void refresh(); // Resample verification info. | |
| 1118 void reset(const DUIterator& that); // Resample after assignment. | |
| 1119 #endif | |
| 1120 | |
| 1121 DUIterator(const Node* node, int dummy_to_avoid_conversion) | |
| 1122 { _idx = 0; debug_only(sample(node)); } | |
| 1123 | |
| 1124 public: | |
| 1125 // initialize to garbage; clear _vdui to disable asserts | |
| 1126 DUIterator() | |
| 1127 { /*initialize to garbage*/ debug_only(_vdui = false); } | |
| 1128 | |
| 1129 void operator++(int dummy_to_specify_postfix_op) | |
| 1130 { _idx++; VDUI_ONLY(verify_increment()); } | |
| 1131 | |
| 1132 void operator--() | |
| 1133 { VDUI_ONLY(verify_resync()); --_idx; } | |
| 1134 | |
| 1135 ~DUIterator() | |
| 1136 { VDUI_ONLY(verify_finish()); } | |
| 1137 | |
| 1138 void operator=(const DUIterator& that) | |
| 1139 { _idx = that._idx; debug_only(reset(that)); } | |
| 1140 }; | |
| 1141 | |
| 1142 DUIterator Node::outs() const | |
| 1143 { return DUIterator(this, 0); } | |
| 1144 DUIterator& Node::refresh_out_pos(DUIterator& i) const | |
| 1145 { I_VDUI_ONLY(i, i.refresh()); return i; } | |
| 1146 bool Node::has_out(DUIterator& i) const | |
| 1147 { I_VDUI_ONLY(i, i.verify(this,true));return i._idx < _outcnt; } | |
| 1148 Node* Node::out(DUIterator& i) const | |
| 1149 { I_VDUI_ONLY(i, i.verify(this)); return debug_only(i._last=) _out[i._idx]; } | |
| 1150 | |
| 1151 | |
| 1152 // Faster DU iterator. Disallows insertions into the out array. | |
| 1153 // Allows deletion from the out array only at the current point. | |
| 1154 // Usage: | |
| 1155 // for (DUIterator_Fast imax, i = x->fast_outs(imax); i < imax; i++) { | |
| 1156 // Node* y = x->fast_out(i); | |
| 1157 // ... | |
| 1158 // } | |
| 1159 // Compiles in product mode to raw Node** pointer arithmetic, with | |
| 1160 // no reloading of pointers from the original node x. If you delete, | |
| 1161 // you must perform "--i; --imax" just before continuing the loop. | |
| 1162 // If you delete multiple copies of the same edge, you must decrement | |
| 1163 // imax, but not i, multiple times: "--i, imax -= num_edges". | |
| 1164 class DUIterator_Fast : public DUIterator_Common { | |
| 1165 friend class Node; | |
| 1166 friend class DUIterator_Last; | |
| 1167 | |
| 1168 // This is the pointer which provides the product-mode behavior. | |
| 1169 // Whatever the product-mode version of the system does to the | |
| 1170 // DUI pointer is done to this pointer. All other fields in | |
| 1171 // this class are used only for assertion checking. | |
| 1172 Node** _outp; | |
| 1173 | |
| 1174 #ifdef ASSERT | |
| 1175 void verify(const Node* node, bool at_end_ok = false); | |
| 1176 void verify_limit(); | |
| 1177 void verify_resync(); | |
| 1178 void verify_relimit(uint n); | |
| 1179 void reset(const DUIterator_Fast& that); | |
| 1180 #endif | |
| 1181 | |
| 1182 // Note: offset must be signed, since -1 is sometimes passed | |
| 1183 DUIterator_Fast(const Node* node, ptrdiff_t offset) | |
| 1184 { _outp = node->_out + offset; debug_only(sample(node)); } | |
| 1185 | |
| 1186 public: | |
| 1187 // initialize to garbage; clear _vdui to disable asserts | |
| 1188 DUIterator_Fast() | |
| 1189 { /*initialize to garbage*/ debug_only(_vdui = false); } | |
| 1190 | |
| 1191 void operator++(int dummy_to_specify_postfix_op) | |
| 1192 { _outp++; VDUI_ONLY(verify(_node, true)); } | |
| 1193 | |
| 1194 void operator--() | |
| 1195 { VDUI_ONLY(verify_resync()); --_outp; } | |
| 1196 | |
| 1197 void operator-=(uint n) // applied to the limit only | |
| 1198 { _outp -= n; VDUI_ONLY(verify_relimit(n)); } | |
| 1199 | |
| 1200 bool operator<(DUIterator_Fast& limit) { | |
| 1201 I_VDUI_ONLY(*this, this->verify(_node, true)); | |
| 1202 I_VDUI_ONLY(limit, limit.verify_limit()); | |
| 1203 return _outp < limit._outp; | |
| 1204 } | |
| 1205 | |
| 1206 void operator=(const DUIterator_Fast& that) | |
| 1207 { _outp = that._outp; debug_only(reset(that)); } | |
| 1208 }; | |
| 1209 | |
| 1210 DUIterator_Fast Node::fast_outs(DUIterator_Fast& imax) const { | |
| 1211 // Assign a limit pointer to the reference argument: | |
| 1212 imax = DUIterator_Fast(this, (ptrdiff_t)_outcnt); | |
| 1213 // Return the base pointer: | |
| 1214 return DUIterator_Fast(this, 0); | |
| 1215 } | |
| 1216 Node* Node::fast_out(DUIterator_Fast& i) const { | |
| 1217 I_VDUI_ONLY(i, i.verify(this)); | |
| 1218 return debug_only(i._last=) *i._outp; | |
| 1219 } | |
| 1220 | |
| 1221 | |
| 1222 // Faster DU iterator. Requires each successive edge to be removed. | |
| 1223 // Does not allow insertion of any edges. | |
| 1224 // Usage: | |
| 1225 // for (DUIterator_Last imin, i = x->last_outs(imin); i >= imin; i -= num_edges) { | |
| 1226 // Node* y = x->last_out(i); | |
| 1227 // ... | |
| 1228 // } | |
| 1229 // Compiles in product mode to raw Node** pointer arithmetic, with | |
| 1230 // no reloading of pointers from the original node x. | |
| 1231 class DUIterator_Last : private DUIterator_Fast { | |
| 1232 friend class Node; | |
| 1233 | |
| 1234 #ifdef ASSERT | |
| 1235 void verify(const Node* node, bool at_end_ok = false); | |
| 1236 void verify_limit(); | |
| 1237 void verify_step(uint num_edges); | |
| 1238 #endif | |
| 1239 | |
| 1240 // Note: offset must be signed, since -1 is sometimes passed | |
| 1241 DUIterator_Last(const Node* node, ptrdiff_t offset) | |
| 1242 : DUIterator_Fast(node, offset) { } | |
| 1243 | |
| 1244 void operator++(int dummy_to_specify_postfix_op) {} // do not use | |
| 1245 void operator<(int) {} // do not use | |
| 1246 | |
| 1247 public: | |
| 1248 DUIterator_Last() { } | |
| 1249 // initialize to garbage | |
| 1250 | |
| 1251 void operator--() | |
| 1252 { _outp--; VDUI_ONLY(verify_step(1)); } | |
| 1253 | |
| 1254 void operator-=(uint n) | |
| 1255 { _outp -= n; VDUI_ONLY(verify_step(n)); } | |
| 1256 | |
| 1257 bool operator>=(DUIterator_Last& limit) { | |
| 1258 I_VDUI_ONLY(*this, this->verify(_node, true)); | |
| 1259 I_VDUI_ONLY(limit, limit.verify_limit()); | |
| 1260 return _outp >= limit._outp; | |
| 1261 } | |
| 1262 | |
| 1263 void operator=(const DUIterator_Last& that) | |
| 1264 { DUIterator_Fast::operator=(that); } | |
| 1265 }; | |
| 1266 | |
| 1267 DUIterator_Last Node::last_outs(DUIterator_Last& imin) const { | |
| 1268 // Assign a limit pointer to the reference argument: | |
| 1269 imin = DUIterator_Last(this, 0); | |
| 1270 // Return the initial pointer: | |
| 1271 return DUIterator_Last(this, (ptrdiff_t)_outcnt - 1); | |
| 1272 } | |
| 1273 Node* Node::last_out(DUIterator_Last& i) const { | |
| 1274 I_VDUI_ONLY(i, i.verify(this)); | |
| 1275 return debug_only(i._last=) *i._outp; | |
| 1276 } | |
| 1277 | |
| 1278 #endif //OPTO_DU_ITERATOR_ASSERT | |
| 1279 | |
| 1280 #undef I_VDUI_ONLY | |
| 1281 #undef VDUI_ONLY | |
| 1282 | |
|
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1283 // An Iterator that truly follows the iterator pattern. Doesn't |
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1284 // support deletion but could be made to. |
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1285 // |
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1286 // for (SimpleDUIterator i(n); i.has_next(); i.next()) { |
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1287 // Node* m = i.get(); |
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1288 // |
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1289 class SimpleDUIterator : public StackObj { |
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1290 private: |
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1291 Node* node; |
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1292 DUIterator_Fast i; |
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1293 DUIterator_Fast imax; |
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1294 public: |
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1295 SimpleDUIterator(Node* n): node(n), i(n->fast_outs(imax)) {} |
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1296 bool has_next() { return i < imax; } |
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1297 void next() { i++; } |
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1298 Node* get() { return node->fast_out(i); } |
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1299 }; |
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1300 |
| 0 | 1301 |
| 1302 //----------------------------------------------------------------------------- | |
| 1303 // Map dense integer indices to Nodes. Uses classic doubling-array trick. | |
| 1304 // Abstractly provides an infinite array of Node*'s, initialized to NULL. | |
| 1305 // Note that the constructor just zeros things, and since I use Arena | |
| 1306 // allocation I do not need a destructor to reclaim storage. | |
| 1307 class Node_Array : public ResourceObj { | |
| 3939 | 1308 friend class VMStructs; |
| 0 | 1309 protected: |
| 1310 Arena *_a; // Arena to allocate in | |
| 1311 uint _max; | |
| 1312 Node **_nodes; | |
| 1313 void grow( uint i ); // Grow array node to fit | |
| 1314 public: | |
| 1315 Node_Array(Arena *a) : _a(a), _max(OptoNodeListSize) { | |
| 1316 _nodes = NEW_ARENA_ARRAY( a, Node *, OptoNodeListSize ); | |
| 1317 for( int i = 0; i < OptoNodeListSize; i++ ) { | |
| 1318 _nodes[i] = NULL; | |
| 1319 } | |
| 1320 } | |
| 1321 | |
| 1322 Node_Array(Node_Array *na) : _a(na->_a), _max(na->_max), _nodes(na->_nodes) {} | |
| 1323 Node *operator[] ( uint i ) const // Lookup, or NULL for not mapped | |
| 1324 { return (i<_max) ? _nodes[i] : (Node*)NULL; } | |
| 1325 Node *at( uint i ) const { assert(i<_max,"oob"); return _nodes[i]; } | |
| 1326 Node **adr() { return _nodes; } | |
| 1327 // Extend the mapping: index i maps to Node *n. | |
| 1328 void map( uint i, Node *n ) { if( i>=_max ) grow(i); _nodes[i] = n; } | |
| 1329 void insert( uint i, Node *n ); | |
| 1330 void remove( uint i ); // Remove, preserving order | |
| 1331 void sort( C_sort_func_t func); | |
| 1332 void reset( Arena *new_a ); // Zap mapping to empty; reclaim storage | |
| 1333 void clear(); // Set all entries to NULL, keep storage | |
| 1334 uint Size() const { return _max; } | |
| 1335 void dump() const; | |
| 1336 }; | |
| 1337 | |
| 1338 class Node_List : public Node_Array { | |
| 3939 | 1339 friend class VMStructs; |
| 0 | 1340 uint _cnt; |
| 1341 public: | |
| 1342 Node_List() : Node_Array(Thread::current()->resource_area()), _cnt(0) {} | |
| 1343 Node_List(Arena *a) : Node_Array(a), _cnt(0) {} | |
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1344 bool contains(Node* n) { |
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1345 for (uint e = 0; e < size(); e++) { |
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1346 if (at(e) == n) return true; |
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1347 } |
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1348 return false; |
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1349 } |
| 0 | 1350 void insert( uint i, Node *n ) { Node_Array::insert(i,n); _cnt++; } |
| 1351 void remove( uint i ) { Node_Array::remove(i); _cnt--; } | |
| 1352 void push( Node *b ) { map(_cnt++,b); } | |
| 1353 void yank( Node *n ); // Find and remove | |
| 1354 Node *pop() { return _nodes[--_cnt]; } | |
| 1355 Node *rpop() { Node *b = _nodes[0]; _nodes[0]=_nodes[--_cnt]; return b;} | |
| 1356 void clear() { _cnt = 0; Node_Array::clear(); } // retain storage | |
| 1357 uint size() const { return _cnt; } | |
| 1358 void dump() const; | |
| 1359 }; | |
| 1360 | |
| 1361 //------------------------------Unique_Node_List------------------------------- | |
| 1362 class Unique_Node_List : public Node_List { | |
| 3939 | 1363 friend class VMStructs; |
| 0 | 1364 VectorSet _in_worklist; |
| 1365 uint _clock_index; // Index in list where to pop from next | |
| 1366 public: | |
| 1367 Unique_Node_List() : Node_List(), _in_worklist(Thread::current()->resource_area()), _clock_index(0) {} | |
| 1368 Unique_Node_List(Arena *a) : Node_List(a), _in_worklist(a), _clock_index(0) {} | |
| 1369 | |
| 1370 void remove( Node *n ); | |
| 1371 bool member( Node *n ) { return _in_worklist.test(n->_idx) != 0; } | |
| 1372 VectorSet &member_set(){ return _in_worklist; } | |
| 1373 | |
| 1374 void push( Node *b ) { | |
| 1375 if( !_in_worklist.test_set(b->_idx) ) | |
| 1376 Node_List::push(b); | |
| 1377 } | |
| 1378 Node *pop() { | |
| 1379 if( _clock_index >= size() ) _clock_index = 0; | |
| 1380 Node *b = at(_clock_index); | |
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1381 map( _clock_index, Node_List::pop()); |
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1382 if (size() != 0) _clock_index++; // Always start from 0 |
| 0 | 1383 _in_worklist >>= b->_idx; |
| 1384 return b; | |
| 1385 } | |
| 1386 Node *remove( uint i ) { | |
| 1387 Node *b = Node_List::at(i); | |
| 1388 _in_worklist >>= b->_idx; | |
| 1389 map(i,Node_List::pop()); | |
| 1390 return b; | |
| 1391 } | |
| 1392 void yank( Node *n ) { _in_worklist >>= n->_idx; Node_List::yank(n); } | |
| 1393 void clear() { | |
| 1394 _in_worklist.Clear(); // Discards storage but grows automatically | |
| 1395 Node_List::clear(); | |
| 1396 _clock_index = 0; | |
| 1397 } | |
| 1398 | |
| 1399 // Used after parsing to remove useless nodes before Iterative GVN | |
| 1400 void remove_useless_nodes(VectorSet &useful); | |
| 1401 | |
| 1402 #ifndef PRODUCT | |
| 1403 void print_set() const { _in_worklist.print(); } | |
| 1404 #endif | |
| 1405 }; | |
| 1406 | |
| 1407 // Inline definition of Compile::record_for_igvn must be deferred to this point. | |
| 1408 inline void Compile::record_for_igvn(Node* n) { | |
| 1409 _for_igvn->push(n); | |
| 1410 } | |
| 1411 | |
| 1412 //------------------------------Node_Stack------------------------------------- | |
| 1413 class Node_Stack { | |
| 3939 | 1414 friend class VMStructs; |
| 0 | 1415 protected: |
| 1416 struct INode { | |
| 1417 Node *node; // Processed node | |
| 1418 uint indx; // Index of next node's child | |
| 1419 }; | |
| 1420 INode *_inode_top; // tos, stack grows up | |
| 1421 INode *_inode_max; // End of _inodes == _inodes + _max | |
| 1422 INode *_inodes; // Array storage for the stack | |
| 1423 Arena *_a; // Arena to allocate in | |
| 1424 void grow(); | |
| 1425 public: | |
| 1426 Node_Stack(int size) { | |
| 1427 size_t max = (size > OptoNodeListSize) ? size : OptoNodeListSize; | |
| 1428 _a = Thread::current()->resource_area(); | |
| 1429 _inodes = NEW_ARENA_ARRAY( _a, INode, max ); | |
| 1430 _inode_max = _inodes + max; | |
| 1431 _inode_top = _inodes - 1; // stack is empty | |
| 1432 } | |
| 1433 | |
| 1434 Node_Stack(Arena *a, int size) : _a(a) { | |
| 1435 size_t max = (size > OptoNodeListSize) ? size : OptoNodeListSize; | |
| 1436 _inodes = NEW_ARENA_ARRAY( _a, INode, max ); | |
| 1437 _inode_max = _inodes + max; | |
| 1438 _inode_top = _inodes - 1; // stack is empty | |
| 1439 } | |
| 1440 | |
| 1441 void pop() { | |
| 1442 assert(_inode_top >= _inodes, "node stack underflow"); | |
| 1443 --_inode_top; | |
| 1444 } | |
| 1445 void push(Node *n, uint i) { | |
| 1446 ++_inode_top; | |
| 1447 if (_inode_top >= _inode_max) grow(); | |
| 1448 INode *top = _inode_top; // optimization | |
| 1449 top->node = n; | |
| 1450 top->indx = i; | |
| 1451 } | |
| 1452 Node *node() const { | |
| 1453 return _inode_top->node; | |
| 1454 } | |
| 1455 Node* node_at(uint i) const { | |
| 1456 assert(_inodes + i <= _inode_top, "in range"); | |
| 1457 return _inodes[i].node; | |
| 1458 } | |
| 1459 uint index() const { | |
| 1460 return _inode_top->indx; | |
| 1461 } | |
| 247 | 1462 uint index_at(uint i) const { |
| 1463 assert(_inodes + i <= _inode_top, "in range"); | |
| 1464 return _inodes[i].indx; | |
| 1465 } | |
| 0 | 1466 void set_node(Node *n) { |
| 1467 _inode_top->node = n; | |
| 1468 } | |
| 1469 void set_index(uint i) { | |
| 1470 _inode_top->indx = i; | |
| 1471 } | |
| 1472 uint size_max() const { return (uint)pointer_delta(_inode_max, _inodes, sizeof(INode)); } // Max size | |
| 40 | 1473 uint size() const { return (uint)pointer_delta((_inode_top+1), _inodes, sizeof(INode)); } // Current size |
| 0 | 1474 bool is_nonempty() const { return (_inode_top >= _inodes); } |
| 1475 bool is_empty() const { return (_inode_top < _inodes); } | |
| 1476 void clear() { _inode_top = _inodes - 1; } // retain storage | |
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1477 |
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1478 // Node_Stack is used to map nodes. |
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1479 Node* find(uint idx) const; |
| 0 | 1480 }; |
| 1481 | |
| 1482 | |
| 1483 //-----------------------------Node_Notes-------------------------------------- | |
| 1484 // Debugging or profiling annotations loosely and sparsely associated | |
| 1485 // with some nodes. See Compile::node_notes_at for the accessor. | |
| 1486 class Node_Notes VALUE_OBJ_CLASS_SPEC { | |
| 3939 | 1487 friend class VMStructs; |
| 0 | 1488 JVMState* _jvms; |
| 1489 | |
| 1490 public: | |
| 1491 Node_Notes(JVMState* jvms = NULL) { | |
| 1492 _jvms = jvms; | |
| 1493 } | |
| 1494 | |
| 1495 JVMState* jvms() { return _jvms; } | |
| 1496 void set_jvms(JVMState* x) { _jvms = x; } | |
| 1497 | |
| 1498 // True if there is nothing here. | |
| 1499 bool is_clear() { | |
| 1500 return (_jvms == NULL); | |
| 1501 } | |
| 1502 | |
| 1503 // Make there be nothing here. | |
| 1504 void clear() { | |
| 1505 _jvms = NULL; | |
| 1506 } | |
| 1507 | |
| 1508 // Make a new, clean node notes. | |
| 1509 static Node_Notes* make(Compile* C) { | |
| 1510 Node_Notes* nn = NEW_ARENA_ARRAY(C->comp_arena(), Node_Notes, 1); | |
| 1511 nn->clear(); | |
| 1512 return nn; | |
| 1513 } | |
| 1514 | |
| 1515 Node_Notes* clone(Compile* C) { | |
| 1516 Node_Notes* nn = NEW_ARENA_ARRAY(C->comp_arena(), Node_Notes, 1); | |
| 1517 (*nn) = (*this); | |
| 1518 return nn; | |
| 1519 } | |
| 1520 | |
| 1521 // Absorb any information from source. | |
| 1522 bool update_from(Node_Notes* source) { | |
| 1523 bool changed = false; | |
| 1524 if (source != NULL) { | |
| 1525 if (source->jvms() != NULL) { | |
| 1526 set_jvms(source->jvms()); | |
| 1527 changed = true; | |
| 1528 } | |
| 1529 } | |
| 1530 return changed; | |
| 1531 } | |
| 1532 }; | |
| 1533 | |
| 1534 // Inlined accessors for Compile::node_nodes that require the preceding class: | |
| 1535 inline Node_Notes* | |
| 1536 Compile::locate_node_notes(GrowableArray<Node_Notes*>* arr, | |
| 1537 int idx, bool can_grow) { | |
| 1538 assert(idx >= 0, "oob"); | |
| 1539 int block_idx = (idx >> _log2_node_notes_block_size); | |
| 1540 int grow_by = (block_idx - (arr == NULL? 0: arr->length())); | |
| 1541 if (grow_by >= 0) { | |
| 1542 if (!can_grow) return NULL; | |
| 1543 grow_node_notes(arr, grow_by + 1); | |
| 1544 } | |
| 1545 // (Every element of arr is a sub-array of length _node_notes_block_size.) | |
| 1546 return arr->at(block_idx) + (idx & (_node_notes_block_size-1)); | |
| 1547 } | |
| 1548 | |
| 1549 inline bool | |
| 1550 Compile::set_node_notes_at(int idx, Node_Notes* value) { | |
| 1551 if (value == NULL || value->is_clear()) | |
| 1552 return false; // nothing to write => write nothing | |
| 1553 Node_Notes* loc = locate_node_notes(_node_note_array, idx, true); | |
| 1554 assert(loc != NULL, ""); | |
| 1555 return loc->update_from(value); | |
| 1556 } | |
| 1557 | |
| 1558 | |
| 1559 //------------------------------TypeNode--------------------------------------- | |
| 1560 // Node with a Type constant. | |
| 1561 class TypeNode : public Node { | |
| 1562 protected: | |
| 1563 virtual uint hash() const; // Check the type | |
| 1564 virtual uint cmp( const Node &n ) const; | |
| 1565 virtual uint size_of() const; // Size is bigger | |
| 1566 const Type* const _type; | |
| 1567 public: | |
| 1568 void set_type(const Type* t) { | |
| 1569 assert(t != NULL, "sanity"); | |
| 1570 debug_only(uint check_hash = (VerifyHashTableKeys && _hash_lock) ? hash() : NO_HASH); | |
| 1571 *(const Type**)&_type = t; // cast away const-ness | |
| 1572 // If this node is in the hash table, make sure it doesn't need a rehash. | |
| 1573 assert(check_hash == NO_HASH || check_hash == hash(), "type change must preserve hash code"); | |
| 1574 } | |
| 1575 const Type* type() const { assert(_type != NULL, "sanity"); return _type; }; | |
| 1576 TypeNode( const Type *t, uint required ) : Node(required), _type(t) { | |
| 1577 init_class_id(Class_Type); | |
| 1578 } | |
| 1579 virtual const Type *Value( PhaseTransform *phase ) const; | |
| 1580 virtual const Type *bottom_type() const; | |
| 1581 virtual uint ideal_reg() const; | |
| 1582 #ifndef PRODUCT | |
| 1583 virtual void dump_spec(outputStream *st) const; | |
| 1584 #endif | |
| 1585 }; | |
| 1972 | 1586 |
| 1587 #endif // SHARE_VM_OPTO_NODE_HPP |