Mercurial > hg > truffle
annotate src/share/vm/opto/block.hpp @ 17795:a9becfeecd1b
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| author | kvn |
|---|---|
| date | Wed, 22 Jan 2014 17:42:23 -0800 |
| parents | 55fb97c4c58d 41b780b43b74 |
| children | 1077c8270209 |
| rev | line source |
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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_BLOCK_HPP |
| 26 #define SHARE_VM_OPTO_BLOCK_HPP | |
| 27 | |
| 28 #include "opto/multnode.hpp" | |
| 29 #include "opto/node.hpp" | |
| 30 #include "opto/phase.hpp" | |
| 31 | |
| 0 | 32 // Optimization - Graph Style |
| 33 | |
| 34 class Block; | |
| 35 class CFGLoop; | |
| 36 class MachCallNode; | |
| 37 class Matcher; | |
| 38 class RootNode; | |
| 39 class VectorSet; | |
| 40 struct Tarjan; | |
| 41 | |
| 42 //------------------------------Block_Array------------------------------------ | |
| 43 // Map dense integer indices to Blocks. Uses classic doubling-array trick. | |
| 44 // Abstractly provides an infinite array of Block*'s, initialized to NULL. | |
| 45 // Note that the constructor just zeros things, and since I use Arena | |
| 46 // allocation I do not need a destructor to reclaim storage. | |
| 47 class Block_Array : public ResourceObj { | |
| 3939 | 48 friend class VMStructs; |
| 0 | 49 uint _size; // allocated size, as opposed to formal limit |
| 50 debug_only(uint _limit;) // limit to formal domain | |
| 12023 | 51 Arena *_arena; // Arena to allocate in |
| 0 | 52 protected: |
| 53 Block **_blocks; | |
| 54 void grow( uint i ); // Grow array node to fit | |
| 55 | |
| 56 public: | |
| 57 Block_Array(Arena *a) : _arena(a), _size(OptoBlockListSize) { | |
| 58 debug_only(_limit=0); | |
| 59 _blocks = NEW_ARENA_ARRAY( a, Block *, OptoBlockListSize ); | |
| 60 for( int i = 0; i < OptoBlockListSize; i++ ) { | |
| 61 _blocks[i] = NULL; | |
| 62 } | |
| 63 } | |
| 64 Block *lookup( uint i ) const // Lookup, or NULL for not mapped | |
| 65 { return (i<Max()) ? _blocks[i] : (Block*)NULL; } | |
| 66 Block *operator[] ( uint i ) const // Lookup, or assert for not mapped | |
| 67 { assert( i < Max(), "oob" ); return _blocks[i]; } | |
| 68 // Extend the mapping: index i maps to Block *n. | |
| 69 void map( uint i, Block *n ) { if( i>=Max() ) grow(i); _blocks[i] = n; } | |
| 70 uint Max() const { debug_only(return _limit); return _size; } | |
| 71 }; | |
| 72 | |
| 73 | |
| 74 class Block_List : public Block_Array { | |
| 3939 | 75 friend class VMStructs; |
| 0 | 76 public: |
| 77 uint _cnt; | |
| 78 Block_List() : Block_Array(Thread::current()->resource_area()), _cnt(0) {} | |
| 12023 | 79 void push( Block *b ) { map(_cnt++,b); } |
| 0 | 80 Block *pop() { return _blocks[--_cnt]; } |
| 81 Block *rpop() { Block *b = _blocks[0]; _blocks[0]=_blocks[--_cnt]; return b;} | |
| 82 void remove( uint i ); | |
| 83 void insert( uint i, Block *n ); | |
| 84 uint size() const { return _cnt; } | |
| 85 void reset() { _cnt = 0; } | |
| 418 | 86 void print(); |
| 0 | 87 }; |
| 88 | |
| 89 | |
| 90 class CFGElement : public ResourceObj { | |
| 3939 | 91 friend class VMStructs; |
| 0 | 92 public: |
| 93 float _freq; // Execution frequency (estimate) | |
| 94 | |
| 95 CFGElement() : _freq(0.0f) {} | |
| 96 virtual bool is_block() { return false; } | |
| 97 virtual bool is_loop() { return false; } | |
| 98 Block* as_Block() { assert(is_block(), "must be block"); return (Block*)this; } | |
| 99 CFGLoop* as_CFGLoop() { assert(is_loop(), "must be loop"); return (CFGLoop*)this; } | |
| 100 }; | |
| 101 | |
| 102 //------------------------------Block------------------------------------------ | |
| 103 // This class defines a Basic Block. | |
| 104 // Basic blocks are used during the output routines, and are not used during | |
| 105 // any optimization pass. They are created late in the game. | |
| 106 class Block : public CFGElement { | |
| 3939 | 107 friend class VMStructs; |
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108 |
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109 private: |
| 0 | 110 // Nodes in this block, in order |
| 111 Node_List _nodes; | |
| 112 | |
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113 public: |
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114 |
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115 // Get the node at index 'at_index', if 'at_index' is out of bounds return NULL |
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116 Node* get_node(uint at_index) const { |
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117 return _nodes[at_index]; |
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118 } |
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119 |
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120 // Get the number of nodes in this block |
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121 uint number_of_nodes() const { |
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122 return _nodes.size(); |
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123 } |
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124 |
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125 // Map a node 'node' to index 'to_index' in the block, if the index is out of bounds the size of the node list is increased |
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126 void map_node(Node* node, uint to_index) { |
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127 _nodes.map(to_index, node); |
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128 } |
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129 |
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130 // Insert a node 'node' at index 'at_index', moving all nodes that are on a higher index one step, if 'at_index' is out of bounds we crash |
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131 void insert_node(Node* node, uint at_index) { |
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132 _nodes.insert(at_index, node); |
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133 } |
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134 |
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135 // Remove a node at index 'at_index' |
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136 void remove_node(uint at_index) { |
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137 _nodes.remove(at_index); |
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138 } |
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139 |
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140 // Push a node 'node' onto the node list |
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141 void push_node(Node* node) { |
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142 _nodes.push(node); |
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143 } |
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144 |
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145 // Pop the last node off the node list |
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146 Node* pop_node() { |
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147 return _nodes.pop(); |
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148 } |
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149 |
| 0 | 150 // Basic blocks have a Node which defines Control for all Nodes pinned in |
| 151 // this block. This Node is a RegionNode. Exception-causing Nodes | |
| 152 // (division, subroutines) and Phi functions are always pinned. Later, | |
| 153 // every Node will get pinned to some block. | |
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154 Node *head() const { return get_node(0); } |
| 0 | 155 |
| 156 // CAUTION: num_preds() is ONE based, so that predecessor numbers match | |
| 157 // input edges to Regions and Phis. | |
| 158 uint num_preds() const { return head()->req(); } | |
| 159 Node *pred(uint i) const { return head()->in(i); } | |
| 160 | |
| 161 // Array of successor blocks, same size as projs array | |
| 162 Block_Array _succs; | |
| 163 | |
| 164 // Basic blocks have some number of Nodes which split control to all | |
| 165 // following blocks. These Nodes are always Projections. The field in | |
| 166 // the Projection and the block-ending Node determine which Block follows. | |
| 167 uint _num_succs; | |
| 168 | |
| 169 // Basic blocks also carry all sorts of good old fashioned DFS information | |
| 170 // used to find loops, loop nesting depth, dominators, etc. | |
| 171 uint _pre_order; // Pre-order DFS number | |
| 172 | |
| 173 // Dominator tree | |
| 174 uint _dom_depth; // Depth in dominator tree for fast LCA | |
| 175 Block* _idom; // Immediate dominator block | |
| 176 | |
| 177 CFGLoop *_loop; // Loop to which this block belongs | |
| 178 uint _rpo; // Number in reverse post order walk | |
| 179 | |
| 180 virtual bool is_block() { return true; } | |
| 418 | 181 float succ_prob(uint i); // return probability of i'th successor |
| 182 int num_fall_throughs(); // How many fall-through candidate this block has | |
| 183 void update_uncommon_branch(Block* un); // Lower branch prob to uncommon code | |
| 184 bool succ_fall_through(uint i); // Is successor "i" is a fall-through candidate | |
| 185 Block* lone_fall_through(); // Return lone fall-through Block or null | |
| 0 | 186 |
| 187 Block* dom_lca(Block* that); // Compute LCA in dominator tree. | |
| 188 #ifdef ASSERT | |
| 189 bool dominates(Block* that) { | |
| 190 int dom_diff = this->_dom_depth - that->_dom_depth; | |
| 191 if (dom_diff > 0) return false; | |
| 192 for (; dom_diff < 0; dom_diff++) that = that->_idom; | |
| 193 return this == that; | |
| 194 } | |
| 195 #endif | |
| 196 | |
| 197 // Report the alignment required by this block. Must be a power of 2. | |
| 198 // The previous block will insert nops to get this alignment. | |
| 199 uint code_alignment(); | |
| 418 | 200 uint compute_loop_alignment(); |
| 0 | 201 |
| 202 // BLOCK_FREQUENCY is a sentinel to mark uses of constant block frequencies. | |
| 203 // It is currently also used to scale such frequencies relative to | |
| 204 // FreqCountInvocations relative to the old value of 1500. | |
| 205 #define BLOCK_FREQUENCY(f) ((f * (float) 1500) / FreqCountInvocations) | |
| 206 | |
| 207 // Register Pressure (estimate) for Splitting heuristic | |
| 208 uint _reg_pressure; | |
| 209 uint _ihrp_index; | |
| 210 uint _freg_pressure; | |
| 211 uint _fhrp_index; | |
| 212 | |
| 213 // Mark and visited bits for an LCA calculation in insert_anti_dependences. | |
| 214 // Since they hold unique node indexes, they do not need reinitialization. | |
| 215 node_idx_t _raise_LCA_mark; | |
| 216 void set_raise_LCA_mark(node_idx_t x) { _raise_LCA_mark = x; } | |
| 217 node_idx_t raise_LCA_mark() const { return _raise_LCA_mark; } | |
| 218 node_idx_t _raise_LCA_visited; | |
| 219 void set_raise_LCA_visited(node_idx_t x) { _raise_LCA_visited = x; } | |
| 220 node_idx_t raise_LCA_visited() const { return _raise_LCA_visited; } | |
| 221 | |
| 222 // Estimated size in bytes of first instructions in a loop. | |
| 223 uint _first_inst_size; | |
| 224 uint first_inst_size() const { return _first_inst_size; } | |
| 225 void set_first_inst_size(uint s) { _first_inst_size = s; } | |
| 226 | |
| 227 // Compute the size of first instructions in this block. | |
| 228 uint compute_first_inst_size(uint& sum_size, uint inst_cnt, PhaseRegAlloc* ra); | |
| 229 | |
| 230 // Compute alignment padding if the block needs it. | |
| 231 // Align a loop if loop's padding is less or equal to padding limit | |
| 232 // or the size of first instructions in the loop > padding. | |
| 233 uint alignment_padding(int current_offset) { | |
| 234 int block_alignment = code_alignment(); | |
| 235 int max_pad = block_alignment-relocInfo::addr_unit(); | |
| 236 if( max_pad > 0 ) { | |
| 237 assert(is_power_of_2(max_pad+relocInfo::addr_unit()), ""); | |
| 238 int current_alignment = current_offset & max_pad; | |
| 239 if( current_alignment != 0 ) { | |
| 240 uint padding = (block_alignment-current_alignment) & max_pad; | |
| 418 | 241 if( has_loop_alignment() && |
| 242 padding > (uint)MaxLoopPad && | |
| 243 first_inst_size() <= padding ) { | |
| 244 return 0; | |
| 0 | 245 } |
| 418 | 246 return padding; |
| 0 | 247 } |
| 248 } | |
| 249 return 0; | |
| 250 } | |
| 251 | |
| 252 // Connector blocks. Connector blocks are basic blocks devoid of | |
| 253 // instructions, but may have relevant non-instruction Nodes, such as | |
| 254 // Phis or MergeMems. Such blocks are discovered and marked during the | |
| 255 // RemoveEmpty phase, and elided during Output. | |
| 256 bool _connector; | |
| 257 void set_connector() { _connector = true; } | |
| 258 bool is_connector() const { return _connector; }; | |
| 259 | |
| 418 | 260 // Loop_alignment will be set for blocks which are at the top of loops. |
| 261 // The block layout pass may rotate loops such that the loop head may not | |
| 262 // be the sequentially first block of the loop encountered in the linear | |
| 263 // list of blocks. If the layout pass is not run, loop alignment is set | |
| 264 // for each block which is the head of a loop. | |
| 265 uint _loop_alignment; | |
| 266 void set_loop_alignment(Block *loop_top) { | |
| 267 uint new_alignment = loop_top->compute_loop_alignment(); | |
| 268 if (new_alignment > _loop_alignment) { | |
| 269 _loop_alignment = new_alignment; | |
| 270 } | |
| 271 } | |
| 272 uint loop_alignment() const { return _loop_alignment; } | |
| 273 bool has_loop_alignment() const { return loop_alignment() > 0; } | |
| 274 | |
| 0 | 275 // Create a new Block with given head Node. |
| 276 // Creates the (empty) predecessor arrays. | |
| 277 Block( Arena *a, Node *headnode ) | |
| 278 : CFGElement(), | |
| 279 _nodes(a), | |
| 280 _succs(a), | |
| 281 _num_succs(0), | |
| 282 _pre_order(0), | |
| 283 _idom(0), | |
| 284 _loop(NULL), | |
| 285 _reg_pressure(0), | |
| 286 _ihrp_index(1), | |
| 287 _freg_pressure(0), | |
| 288 _fhrp_index(1), | |
| 289 _raise_LCA_mark(0), | |
| 290 _raise_LCA_visited(0), | |
| 291 _first_inst_size(999999), | |
| 418 | 292 _connector(false), |
| 293 _loop_alignment(0) { | |
| 0 | 294 _nodes.push(headnode); |
| 295 } | |
| 296 | |
| 297 // Index of 'end' Node | |
| 298 uint end_idx() const { | |
| 299 // %%%%% add a proj after every goto | |
| 300 // so (last->is_block_proj() != last) always, then simplify this code | |
| 301 // This will not give correct end_idx for block 0 when it only contains root. | |
| 302 int last_idx = _nodes.size() - 1; | |
| 303 Node *last = _nodes[last_idx]; | |
| 304 assert(last->is_block_proj() == last || last->is_block_proj() == _nodes[last_idx - _num_succs], ""); | |
| 305 return (last->is_block_proj() == last) ? last_idx : (last_idx - _num_succs); | |
| 306 } | |
| 307 | |
| 308 // Basic blocks have a Node which ends them. This Node determines which | |
| 309 // basic block follows this one in the program flow. This Node is either an | |
| 310 // IfNode, a GotoNode, a JmpNode, or a ReturnNode. | |
| 311 Node *end() const { return _nodes[end_idx()]; } | |
| 312 | |
| 313 // Add an instruction to an existing block. It must go after the head | |
| 314 // instruction and before the end instruction. | |
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315 void add_inst( Node *n ) { insert_node(n, end_idx()); } |
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316 // Find node in block. Fails if node not in block. |
| 0 | 317 uint find_node( const Node *n ) const; |
| 318 // Find and remove n from block list | |
| 319 void find_remove( const Node *n ); | |
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320 // Check wether the node is in the block. |
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321 bool contains (const Node *n) const; |
| 0 | 322 |
| 323 // Return the empty status of a block | |
| 324 enum { not_empty, empty_with_goto, completely_empty }; | |
| 325 int is_Empty() const; | |
| 326 | |
| 327 // Forward through connectors | |
| 328 Block* non_connector() { | |
| 329 Block* s = this; | |
| 330 while (s->is_connector()) { | |
| 331 s = s->_succs[0]; | |
| 332 } | |
| 333 return s; | |
| 334 } | |
| 335 | |
| 418 | 336 // Return true if b is a successor of this block |
| 337 bool has_successor(Block* b) const { | |
| 338 for (uint i = 0; i < _num_succs; i++ ) { | |
| 339 if (non_connector_successor(i) == b) { | |
| 340 return true; | |
| 341 } | |
| 342 } | |
| 343 return false; | |
| 344 } | |
| 345 | |
| 0 | 346 // Successor block, after forwarding through connectors |
| 347 Block* non_connector_successor(int i) const { | |
| 348 return _succs[i]->non_connector(); | |
| 349 } | |
| 350 | |
| 351 // Examine block's code shape to predict if it is not commonly executed. | |
| 352 bool has_uncommon_code() const; | |
| 353 | |
| 354 #ifndef PRODUCT | |
| 355 // Debugging print of basic block | |
| 3851 | 356 void dump_bidx(const Block* orig, outputStream* st = tty) const; |
| 12023 | 357 void dump_pred(const PhaseCFG* cfg, Block* orig, outputStream* st = tty) const; |
| 358 void dump_head(const PhaseCFG* cfg, outputStream* st = tty) const; | |
| 3851 | 359 void dump() const; |
| 12023 | 360 void dump(const PhaseCFG* cfg) const; |
| 0 | 361 #endif |
| 362 }; | |
| 363 | |
| 364 | |
| 365 //------------------------------PhaseCFG--------------------------------------- | |
| 366 // Build an array of Basic Block pointers, one per Node. | |
| 367 class PhaseCFG : public Phase { | |
| 3939 | 368 friend class VMStructs; |
| 0 | 369 private: |
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370 |
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371 // Root of whole program |
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372 RootNode* _root; |
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373 |
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374 // The block containing the root node |
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375 Block* _root_block; |
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376 |
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377 // List of basic blocks that are created during CFG creation |
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378 Block_List _blocks; |
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379 |
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380 // Count of basic blocks |
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381 uint _number_of_blocks; |
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382 |
| 12023 | 383 // Arena for the blocks to be stored in |
| 384 Arena* _block_arena; | |
| 385 | |
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386 // The matcher for this compilation |
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387 Matcher& _matcher; |
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388 |
| 12023 | 389 // Map nodes to owning basic block |
| 390 Block_Array _node_to_block_mapping; | |
| 391 | |
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392 // Loop from the root |
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393 CFGLoop* _root_loop; |
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394 |
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395 // Outmost loop frequency |
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396 float _outer_loop_frequency; |
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397 |
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398 // Per node latency estimation, valid only during GCM |
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399 GrowableArray<uint>* _node_latency; |
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400 |
| 0 | 401 // Build a proper looking cfg. Return count of basic blocks |
| 402 uint build_cfg(); | |
| 403 | |
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404 // Build the dominator tree so that we know where we can move instructions |
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405 void build_dominator_tree(); |
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406 |
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407 // Estimate block frequencies based on IfNode probabilities, so that we know where we want to move instructions |
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408 void estimate_block_frequency(); |
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409 |
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410 // Global Code Motion. See Click's PLDI95 paper. Place Nodes in specific |
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411 // basic blocks; i.e. _node_to_block_mapping now maps _idx for all Nodes to some Block. |
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412 // Move nodes to ensure correctness from GVN and also try to move nodes out of loops. |
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413 void global_code_motion(); |
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414 |
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415 // Schedule Nodes early in their basic blocks. |
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416 bool schedule_early(VectorSet &visited, Node_List &roots); |
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417 |
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418 // For each node, find the latest block it can be scheduled into |
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419 // and then select the cheapest block between the latest and earliest |
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420 // block to place the node. |
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421 void schedule_late(VectorSet &visited, Node_List &stack); |
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422 |
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423 // Compute the (backwards) latency of a node from a single use |
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424 int latency_from_use(Node *n, const Node *def, Node *use); |
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425 |
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426 // Compute the (backwards) latency of a node from the uses of this instruction |
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427 void partial_latency_of_defs(Node *n); |
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428 |
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429 // Compute the instruction global latency with a backwards walk |
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430 void compute_latencies_backwards(VectorSet &visited, Node_List &stack); |
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431 |
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432 // Pick a block between early and late that is a cheaper alternative |
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433 // to late. Helper for schedule_late. |
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434 Block* hoist_to_cheaper_block(Block* LCA, Block* early, Node* self); |
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435 |
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436 bool schedule_local(Block* block, GrowableArray<int>& ready_cnt, VectorSet& next_call); |
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437 void set_next_call(Block* block, Node* n, VectorSet& next_call); |
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438 void needed_for_next_call(Block* block, Node* this_call, VectorSet& next_call); |
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439 |
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440 // Perform basic-block local scheduling |
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441 Node* select(Block* block, Node_List& worklist, GrowableArray<int>& ready_cnt, VectorSet& next_call, uint sched_slot); |
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442 |
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443 // Schedule a call next in the block |
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444 uint sched_call(Block* block, uint node_cnt, Node_List& worklist, GrowableArray<int>& ready_cnt, MachCallNode* mcall, VectorSet& next_call); |
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445 |
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446 // Cleanup if any code lands between a Call and his Catch |
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447 void call_catch_cleanup(Block* block); |
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448 |
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449 Node* catch_cleanup_find_cloned_def(Block* use_blk, Node* def, Block* def_blk, int n_clone_idx); |
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450 void catch_cleanup_inter_block(Node *use, Block *use_blk, Node *def, Block *def_blk, int n_clone_idx); |
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451 |
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452 // Detect implicit-null-check opportunities. Basically, find NULL checks |
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453 // with suitable memory ops nearby. Use the memory op to do the NULL check. |
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454 // I can generate a memory op if there is not one nearby. |
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455 void implicit_null_check(Block* block, Node *proj, Node *val, int allowed_reasons); |
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456 |
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457 // Perform a Depth First Search (DFS). |
| 0 | 458 // Setup 'vertex' as DFS to vertex mapping. |
| 459 // Setup 'semi' as vertex to DFS mapping. | |
| 460 // Set 'parent' to DFS parent. | |
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461 uint do_DFS(Tarjan* tarjan, uint rpo_counter); |
| 0 | 462 |
| 463 // Helper function to insert a node into a block | |
| 464 void schedule_node_into_block( Node *n, Block *b ); | |
| 465 | |
| 604 | 466 void replace_block_proj_ctrl( Node *n ); |
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601
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467 |
| 0 | 468 // Set the basic block for pinned Nodes |
| 469 void schedule_pinned_nodes( VectorSet &visited ); | |
| 470 | |
| 471 // I'll need a few machine-specific GotoNodes. Clone from this one. | |
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472 // Used when building the CFG and creating end nodes for blocks. |
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473 MachNode* _goto; |
| 0 | 474 |
| 475 Block* insert_anti_dependences(Block* LCA, Node* load, bool verify = false); | |
| 476 void verify_anti_dependences(Block* LCA, Node* load) { | |
| 12023 | 477 assert(LCA == get_block_for_node(load), "should already be scheduled"); |
| 0 | 478 insert_anti_dependences(LCA, load, true); |
| 479 } | |
| 480 | |
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481 bool move_to_next(Block* bx, uint b_index); |
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482 void move_to_end(Block* bx, uint b_index); |
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483 |
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484 void insert_goto_at(uint block_no, uint succ_no); |
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485 |
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486 // Check for NeverBranch at block end. This needs to become a GOTO to the |
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487 // true target. NeverBranch are treated as a conditional branch that always |
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488 // goes the same direction for most of the optimizer and are used to give a |
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489 // fake exit path to infinite loops. At this late stage they need to turn |
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490 // into Goto's so that when you enter the infinite loop you indeed hang. |
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491 void convert_NeverBranch_to_Goto(Block *b); |
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492 |
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493 CFGLoop* create_loop_tree(); |
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494 |
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495 #ifndef PRODUCT |
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496 bool _trace_opto_pipelining; // tracing flag |
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497 #endif |
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498 |
| 0 | 499 public: |
| 12023 | 500 PhaseCFG(Arena* arena, RootNode* root, Matcher& matcher); |
| 0 | 501 |
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502 void set_latency_for_node(Node* node, int latency) { |
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503 _node_latency->at_put_grow(node->_idx, latency); |
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504 } |
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505 |
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506 uint get_latency_for_node(Node* node) { |
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507 return _node_latency->at_grow(node->_idx); |
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508 } |
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509 |
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510 // Get the outer most frequency |
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511 float get_outer_loop_frequency() const { |
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512 return _outer_loop_frequency; |
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513 } |
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514 |
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515 // Get the root node of the CFG |
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516 RootNode* get_root_node() const { |
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517 return _root; |
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518 } |
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519 |
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520 // Get the block of the root node |
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521 Block* get_root_block() const { |
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522 return _root_block; |
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523 } |
| 0 | 524 |
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525 // Add a block at a position and moves the later ones one step |
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526 void add_block_at(uint pos, Block* block) { |
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527 _blocks.insert(pos, block); |
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528 _number_of_blocks++; |
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529 } |
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530 |
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531 // Adds a block to the top of the block list |
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532 void add_block(Block* block) { |
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533 _blocks.push(block); |
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534 _number_of_blocks++; |
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535 } |
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536 |
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537 // Clear the list of blocks |
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538 void clear_blocks() { |
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539 _blocks.reset(); |
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540 _number_of_blocks = 0; |
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541 } |
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542 |
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543 // Get the block at position pos in _blocks |
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544 Block* get_block(uint pos) const { |
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545 return _blocks[pos]; |
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546 } |
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547 |
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548 // Number of blocks |
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549 uint number_of_blocks() const { |
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550 return _number_of_blocks; |
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551 } |
| 12023 | 552 |
| 553 // set which block this node should reside in | |
| 554 void map_node_to_block(const Node* node, Block* block) { | |
| 555 _node_to_block_mapping.map(node->_idx, block); | |
| 556 } | |
| 557 | |
| 558 // removes the mapping from a node to a block | |
| 559 void unmap_node_from_block(const Node* node) { | |
| 560 _node_to_block_mapping.map(node->_idx, NULL); | |
| 561 } | |
| 562 | |
| 563 // get the block in which this node resides | |
| 564 Block* get_block_for_node(const Node* node) const { | |
| 565 return _node_to_block_mapping[node->_idx]; | |
| 566 } | |
| 567 | |
| 568 // does this node reside in a block; return true | |
| 569 bool has_block(const Node* node) const { | |
| 570 return (_node_to_block_mapping.lookup(node->_idx) != NULL); | |
| 571 } | |
| 572 | |
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573 // Use frequency calculations and code shape to predict if the block |
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574 // is uncommon. |
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575 bool is_uncommon(const Block* block); |
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576 |
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577 #ifdef ASSERT |
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578 Unique_Node_List _raw_oops; |
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579 #endif |
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580 |
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581 // Do global code motion by first building dominator tree and estimate block frequency |
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582 // Returns true on success |
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583 bool do_global_code_motion(); |
| 0 | 584 |
| 585 // Compute the (backwards) latency of a node from the uses | |
| 586 void latency_from_uses(Node *n); | |
| 587 | |
| 418 | 588 // Set loop alignment |
| 589 void set_loop_alignment(); | |
| 590 | |
| 0 | 591 // Remove empty basic blocks |
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592 void remove_empty_blocks(); |
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593 Block *fixup_trap_based_check(Node *branch, Block *block, int block_pos, Block *bnext); |
| 418 | 594 void fixup_flow(); |
| 0 | 595 |
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596 // Insert a node into a block at index and map the node to the block |
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597 void insert(Block *b, uint idx, Node *n) { |
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598 b->insert_node(n , idx); |
| 12023 | 599 map_node_to_block(n, b); |
| 0 | 600 } |
| 601 | |
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602 // Check all nodes and postalloc_expand them if necessary. |
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603 void postalloc_expand(PhaseRegAlloc* _ra); |
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604 |
| 0 | 605 #ifndef PRODUCT |
| 606 bool trace_opto_pipelining() const { return _trace_opto_pipelining; } | |
| 607 | |
| 608 // Debugging print of CFG | |
| 609 void dump( ) const; // CFG only | |
| 610 void _dump_cfg( const Node *end, VectorSet &visited ) const; | |
| 611 void verify() const; | |
| 612 void dump_headers(); | |
| 613 #else | |
| 614 bool trace_opto_pipelining() const { return false; } | |
| 615 #endif | |
| 616 }; | |
| 617 | |
| 618 | |
| 418 | 619 //------------------------------UnionFind-------------------------------------- |
| 0 | 620 // Map Block indices to a block-index for a cfg-cover. |
| 621 // Array lookup in the optimized case. | |
| 622 class UnionFind : public ResourceObj { | |
| 623 uint _cnt, _max; | |
| 624 uint* _indices; | |
| 625 ReallocMark _nesting; // assertion check for reallocations | |
| 626 public: | |
| 627 UnionFind( uint max ); | |
| 628 void reset( uint max ); // Reset to identity map for [0..max] | |
| 629 | |
| 630 uint lookup( uint nidx ) const { | |
| 631 return _indices[nidx]; | |
| 632 } | |
| 633 uint operator[] (uint nidx) const { return lookup(nidx); } | |
| 634 | |
| 635 void map( uint from_idx, uint to_idx ) { | |
| 636 assert( from_idx < _cnt, "oob" ); | |
| 637 _indices[from_idx] = to_idx; | |
| 638 } | |
| 639 void extend( uint from_idx, uint to_idx ); | |
| 640 | |
| 641 uint Size() const { return _cnt; } | |
| 642 | |
| 643 uint Find( uint idx ) { | |
| 644 assert( idx < 65536, "Must fit into uint"); | |
| 645 uint uf_idx = lookup(idx); | |
| 646 return (uf_idx == idx) ? uf_idx : Find_compress(idx); | |
| 647 } | |
| 648 uint Find_compress( uint idx ); | |
| 649 uint Find_const( uint idx ) const; | |
| 650 void Union( uint idx1, uint idx2 ); | |
| 651 | |
| 652 }; | |
| 653 | |
| 654 //----------------------------BlockProbPair--------------------------- | |
| 655 // Ordered pair of Node*. | |
| 656 class BlockProbPair VALUE_OBJ_CLASS_SPEC { | |
| 657 protected: | |
| 658 Block* _target; // block target | |
| 659 float _prob; // probability of edge to block | |
| 660 public: | |
| 661 BlockProbPair() : _target(NULL), _prob(0.0) {} | |
| 662 BlockProbPair(Block* b, float p) : _target(b), _prob(p) {} | |
| 663 | |
| 664 Block* get_target() const { return _target; } | |
| 665 float get_prob() const { return _prob; } | |
| 666 }; | |
| 667 | |
| 668 //------------------------------CFGLoop------------------------------------------- | |
| 669 class CFGLoop : public CFGElement { | |
| 3939 | 670 friend class VMStructs; |
| 0 | 671 int _id; |
| 672 int _depth; | |
| 673 CFGLoop *_parent; // root of loop tree is the method level "pseudo" loop, it's parent is null | |
| 674 CFGLoop *_sibling; // null terminated list | |
| 675 CFGLoop *_child; // first child, use child's sibling to visit all immediately nested loops | |
| 676 GrowableArray<CFGElement*> _members; // list of members of loop | |
| 677 GrowableArray<BlockProbPair> _exits; // list of successor blocks and their probabilities | |
| 678 float _exit_prob; // probability any loop exit is taken on a single loop iteration | |
| 679 void update_succ_freq(Block* b, float freq); | |
| 680 | |
| 681 public: | |
| 682 CFGLoop(int id) : | |
| 683 CFGElement(), | |
| 684 _id(id), | |
| 685 _depth(0), | |
| 686 _parent(NULL), | |
| 687 _sibling(NULL), | |
| 688 _child(NULL), | |
| 689 _exit_prob(1.0f) {} | |
| 690 CFGLoop* parent() { return _parent; } | |
| 12023 | 691 void push_pred(Block* blk, int i, Block_List& worklist, PhaseCFG* cfg); |
| 0 | 692 void add_member(CFGElement *s) { _members.push(s); } |
| 693 void add_nested_loop(CFGLoop* cl); | |
| 694 Block* head() { | |
| 695 assert(_members.at(0)->is_block(), "head must be a block"); | |
| 696 Block* hd = _members.at(0)->as_Block(); | |
| 697 assert(hd->_loop == this, "just checking"); | |
| 698 assert(hd->head()->is_Loop(), "must begin with loop head node"); | |
| 699 return hd; | |
| 700 } | |
| 701 Block* backedge_block(); // Return the block on the backedge of the loop (else NULL) | |
| 702 void compute_loop_depth(int depth); | |
| 703 void compute_freq(); // compute frequency with loop assuming head freq 1.0f | |
| 704 void scale_freq(); // scale frequency by loop trip count (including outer loops) | |
| 673 | 705 float outer_loop_freq() const; // frequency of outer loop |
| 0 | 706 bool in_loop_nest(Block* b); |
| 707 float trip_count() const { return 1.0f / _exit_prob; } | |
| 708 virtual bool is_loop() { return true; } | |
| 709 int id() { return _id; } | |
| 710 | |
| 711 #ifndef PRODUCT | |
| 712 void dump( ) const; | |
| 713 void dump_tree() const; | |
| 714 #endif | |
| 715 }; | |
| 418 | 716 |
| 717 | |
| 718 //----------------------------------CFGEdge------------------------------------ | |
| 719 // A edge between two basic blocks that will be embodied by a branch or a | |
| 720 // fall-through. | |
| 721 class CFGEdge : public ResourceObj { | |
| 3939 | 722 friend class VMStructs; |
| 418 | 723 private: |
| 724 Block * _from; // Source basic block | |
| 725 Block * _to; // Destination basic block | |
| 726 float _freq; // Execution frequency (estimate) | |
| 727 int _state; | |
| 728 bool _infrequent; | |
| 729 int _from_pct; | |
| 730 int _to_pct; | |
| 731 | |
| 732 // Private accessors | |
| 733 int from_pct() const { return _from_pct; } | |
| 734 int to_pct() const { return _to_pct; } | |
| 735 int from_infrequent() const { return from_pct() < BlockLayoutMinDiamondPercentage; } | |
| 736 int to_infrequent() const { return to_pct() < BlockLayoutMinDiamondPercentage; } | |
| 737 | |
| 738 public: | |
| 739 enum { | |
| 740 open, // initial edge state; unprocessed | |
| 741 connected, // edge used to connect two traces together | |
| 742 interior // edge is interior to trace (could be backedge) | |
| 743 }; | |
| 744 | |
| 745 CFGEdge(Block *from, Block *to, float freq, int from_pct, int to_pct) : | |
| 746 _from(from), _to(to), _freq(freq), | |
| 747 _from_pct(from_pct), _to_pct(to_pct), _state(open) { | |
| 748 _infrequent = from_infrequent() || to_infrequent(); | |
| 749 } | |
| 750 | |
| 751 float freq() const { return _freq; } | |
| 752 Block* from() const { return _from; } | |
| 753 Block* to () const { return _to; } | |
| 754 int infrequent() const { return _infrequent; } | |
| 755 int state() const { return _state; } | |
| 756 | |
| 757 void set_state(int state) { _state = state; } | |
| 758 | |
| 759 #ifndef PRODUCT | |
| 760 void dump( ) const; | |
| 761 #endif | |
| 762 }; | |
| 763 | |
| 764 | |
| 765 //-----------------------------------Trace------------------------------------- | |
| 766 // An ordered list of basic blocks. | |
| 767 class Trace : public ResourceObj { | |
| 768 private: | |
| 769 uint _id; // Unique Trace id (derived from initial block) | |
| 770 Block ** _next_list; // Array mapping index to next block | |
| 771 Block ** _prev_list; // Array mapping index to previous block | |
| 772 Block * _first; // First block in the trace | |
| 773 Block * _last; // Last block in the trace | |
| 774 | |
| 775 // Return the block that follows "b" in the trace. | |
| 776 Block * next(Block *b) const { return _next_list[b->_pre_order]; } | |
| 777 void set_next(Block *b, Block *n) const { _next_list[b->_pre_order] = n; } | |
| 778 | |
| 605 | 779 // Return the block that precedes "b" in the trace. |
| 418 | 780 Block * prev(Block *b) const { return _prev_list[b->_pre_order]; } |
| 781 void set_prev(Block *b, Block *p) const { _prev_list[b->_pre_order] = p; } | |
| 782 | |
| 783 // We've discovered a loop in this trace. Reset last to be "b", and first as | |
| 784 // the block following "b | |
| 785 void break_loop_after(Block *b) { | |
| 786 _last = b; | |
| 787 _first = next(b); | |
| 788 set_prev(_first, NULL); | |
| 789 set_next(_last, NULL); | |
| 790 } | |
| 791 | |
| 792 public: | |
| 793 | |
| 794 Trace(Block *b, Block **next_list, Block **prev_list) : | |
| 795 _first(b), | |
| 796 _last(b), | |
| 797 _next_list(next_list), | |
| 798 _prev_list(prev_list), | |
| 799 _id(b->_pre_order) { | |
| 800 set_next(b, NULL); | |
| 801 set_prev(b, NULL); | |
| 802 }; | |
| 803 | |
| 804 // Return the id number | |
| 805 uint id() const { return _id; } | |
| 806 void set_id(uint id) { _id = id; } | |
| 807 | |
| 808 // Return the first block in the trace | |
| 809 Block * first_block() const { return _first; } | |
| 810 | |
| 811 // Return the last block in the trace | |
| 812 Block * last_block() const { return _last; } | |
| 813 | |
| 814 // Insert a trace in the middle of this one after b | |
| 815 void insert_after(Block *b, Trace *tr) { | |
| 816 set_next(tr->last_block(), next(b)); | |
| 817 if (next(b) != NULL) { | |
| 818 set_prev(next(b), tr->last_block()); | |
| 819 } | |
| 820 | |
| 821 set_next(b, tr->first_block()); | |
| 822 set_prev(tr->first_block(), b); | |
| 823 | |
| 824 if (b == _last) { | |
| 825 _last = tr->last_block(); | |
| 826 } | |
| 827 } | |
| 828 | |
| 829 void insert_before(Block *b, Trace *tr) { | |
| 830 Block *p = prev(b); | |
| 831 assert(p != NULL, "use append instead"); | |
| 832 insert_after(p, tr); | |
| 833 } | |
| 834 | |
| 835 // Append another trace to this one. | |
| 836 void append(Trace *tr) { | |
| 837 insert_after(_last, tr); | |
| 838 } | |
| 839 | |
| 840 // Append a block at the end of this trace | |
| 841 void append(Block *b) { | |
| 842 set_next(_last, b); | |
| 843 set_prev(b, _last); | |
| 844 _last = b; | |
| 845 } | |
| 846 | |
| 847 // Adjust the the blocks in this trace | |
| 848 void fixup_blocks(PhaseCFG &cfg); | |
| 849 bool backedge(CFGEdge *e); | |
| 850 | |
| 851 #ifndef PRODUCT | |
| 852 void dump( ) const; | |
| 853 #endif | |
| 854 }; | |
| 855 | |
| 856 //------------------------------PhaseBlockLayout------------------------------- | |
| 857 // Rearrange blocks into some canonical order, based on edges and their frequencies | |
| 858 class PhaseBlockLayout : public Phase { | |
| 3939 | 859 friend class VMStructs; |
| 418 | 860 PhaseCFG &_cfg; // Control flow graph |
| 861 | |
| 862 GrowableArray<CFGEdge *> *edges; | |
| 863 Trace **traces; | |
| 864 Block **next; | |
| 865 Block **prev; | |
| 866 UnionFind *uf; | |
| 867 | |
| 868 // Given a block, find its encompassing Trace | |
| 869 Trace * trace(Block *b) { | |
| 870 return traces[uf->Find_compress(b->_pre_order)]; | |
| 871 } | |
| 872 public: | |
| 873 PhaseBlockLayout(PhaseCFG &cfg); | |
| 874 | |
| 875 void find_edges(); | |
| 876 void grow_traces(); | |
| 877 void merge_traces(bool loose_connections); | |
| 878 void reorder_traces(int count); | |
| 879 void union_traces(Trace* from, Trace* to); | |
| 880 }; | |
| 1972 | 881 |
| 882 #endif // SHARE_VM_OPTO_BLOCK_HPP |