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annotate src/share/vm/opto/block.hpp @ 4597:8bc6f680a88d
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author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Tue, 14 Feb 2012 15:01:36 -0800 |
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0 | 1 /* |
3939 | 2 * Copyright (c) 1997, 2011, 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 * | |
1552
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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 | |
51 protected: | |
52 Block **_blocks; | |
53 void grow( uint i ); // Grow array node to fit | |
54 | |
55 public: | |
56 Arena *_arena; // Arena to allocate in | |
57 | |
58 Block_Array(Arena *a) : _arena(a), _size(OptoBlockListSize) { | |
59 debug_only(_limit=0); | |
60 _blocks = NEW_ARENA_ARRAY( a, Block *, OptoBlockListSize ); | |
61 for( int i = 0; i < OptoBlockListSize; i++ ) { | |
62 _blocks[i] = NULL; | |
63 } | |
64 } | |
65 Block *lookup( uint i ) const // Lookup, or NULL for not mapped | |
66 { return (i<Max()) ? _blocks[i] : (Block*)NULL; } | |
67 Block *operator[] ( uint i ) const // Lookup, or assert for not mapped | |
68 { assert( i < Max(), "oob" ); return _blocks[i]; } | |
69 // Extend the mapping: index i maps to Block *n. | |
70 void map( uint i, Block *n ) { if( i>=Max() ) grow(i); _blocks[i] = n; } | |
71 uint Max() const { debug_only(return _limit); return _size; } | |
72 }; | |
73 | |
74 | |
75 class Block_List : public Block_Array { | |
3939 | 76 friend class VMStructs; |
0 | 77 public: |
78 uint _cnt; | |
79 Block_List() : Block_Array(Thread::current()->resource_area()), _cnt(0) {} | |
80 void push( Block *b ) { map(_cnt++,b); } | |
81 Block *pop() { return _blocks[--_cnt]; } | |
82 Block *rpop() { Block *b = _blocks[0]; _blocks[0]=_blocks[--_cnt]; return b;} | |
83 void remove( uint i ); | |
84 void insert( uint i, Block *n ); | |
85 uint size() const { return _cnt; } | |
86 void reset() { _cnt = 0; } | |
418 | 87 void print(); |
0 | 88 }; |
89 | |
90 | |
91 class CFGElement : public ResourceObj { | |
3939 | 92 friend class VMStructs; |
0 | 93 public: |
94 float _freq; // Execution frequency (estimate) | |
95 | |
96 CFGElement() : _freq(0.0f) {} | |
97 virtual bool is_block() { return false; } | |
98 virtual bool is_loop() { return false; } | |
99 Block* as_Block() { assert(is_block(), "must be block"); return (Block*)this; } | |
100 CFGLoop* as_CFGLoop() { assert(is_loop(), "must be loop"); return (CFGLoop*)this; } | |
101 }; | |
102 | |
103 //------------------------------Block------------------------------------------ | |
104 // This class defines a Basic Block. | |
105 // Basic blocks are used during the output routines, and are not used during | |
106 // any optimization pass. They are created late in the game. | |
107 class Block : public CFGElement { | |
3939 | 108 friend class VMStructs; |
0 | 109 public: |
110 // Nodes in this block, in order | |
111 Node_List _nodes; | |
112 | |
113 // Basic blocks have a Node which defines Control for all Nodes pinned in | |
114 // this block. This Node is a RegionNode. Exception-causing Nodes | |
115 // (division, subroutines) and Phi functions are always pinned. Later, | |
116 // every Node will get pinned to some block. | |
117 Node *head() const { return _nodes[0]; } | |
118 | |
119 // CAUTION: num_preds() is ONE based, so that predecessor numbers match | |
120 // input edges to Regions and Phis. | |
121 uint num_preds() const { return head()->req(); } | |
122 Node *pred(uint i) const { return head()->in(i); } | |
123 | |
124 // Array of successor blocks, same size as projs array | |
125 Block_Array _succs; | |
126 | |
127 // Basic blocks have some number of Nodes which split control to all | |
128 // following blocks. These Nodes are always Projections. The field in | |
129 // the Projection and the block-ending Node determine which Block follows. | |
130 uint _num_succs; | |
131 | |
132 // Basic blocks also carry all sorts of good old fashioned DFS information | |
133 // used to find loops, loop nesting depth, dominators, etc. | |
134 uint _pre_order; // Pre-order DFS number | |
135 | |
136 // Dominator tree | |
137 uint _dom_depth; // Depth in dominator tree for fast LCA | |
138 Block* _idom; // Immediate dominator block | |
139 | |
140 CFGLoop *_loop; // Loop to which this block belongs | |
141 uint _rpo; // Number in reverse post order walk | |
142 | |
143 virtual bool is_block() { return true; } | |
418 | 144 float succ_prob(uint i); // return probability of i'th successor |
145 int num_fall_throughs(); // How many fall-through candidate this block has | |
146 void update_uncommon_branch(Block* un); // Lower branch prob to uncommon code | |
147 bool succ_fall_through(uint i); // Is successor "i" is a fall-through candidate | |
148 Block* lone_fall_through(); // Return lone fall-through Block or null | |
0 | 149 |
150 Block* dom_lca(Block* that); // Compute LCA in dominator tree. | |
151 #ifdef ASSERT | |
152 bool dominates(Block* that) { | |
153 int dom_diff = this->_dom_depth - that->_dom_depth; | |
154 if (dom_diff > 0) return false; | |
155 for (; dom_diff < 0; dom_diff++) that = that->_idom; | |
156 return this == that; | |
157 } | |
158 #endif | |
159 | |
160 // Report the alignment required by this block. Must be a power of 2. | |
161 // The previous block will insert nops to get this alignment. | |
162 uint code_alignment(); | |
418 | 163 uint compute_loop_alignment(); |
0 | 164 |
165 // BLOCK_FREQUENCY is a sentinel to mark uses of constant block frequencies. | |
166 // It is currently also used to scale such frequencies relative to | |
167 // FreqCountInvocations relative to the old value of 1500. | |
168 #define BLOCK_FREQUENCY(f) ((f * (float) 1500) / FreqCountInvocations) | |
169 | |
170 // Register Pressure (estimate) for Splitting heuristic | |
171 uint _reg_pressure; | |
172 uint _ihrp_index; | |
173 uint _freg_pressure; | |
174 uint _fhrp_index; | |
175 | |
176 // Mark and visited bits for an LCA calculation in insert_anti_dependences. | |
177 // Since they hold unique node indexes, they do not need reinitialization. | |
178 node_idx_t _raise_LCA_mark; | |
179 void set_raise_LCA_mark(node_idx_t x) { _raise_LCA_mark = x; } | |
180 node_idx_t raise_LCA_mark() const { return _raise_LCA_mark; } | |
181 node_idx_t _raise_LCA_visited; | |
182 void set_raise_LCA_visited(node_idx_t x) { _raise_LCA_visited = x; } | |
183 node_idx_t raise_LCA_visited() const { return _raise_LCA_visited; } | |
184 | |
185 // Estimated size in bytes of first instructions in a loop. | |
186 uint _first_inst_size; | |
187 uint first_inst_size() const { return _first_inst_size; } | |
188 void set_first_inst_size(uint s) { _first_inst_size = s; } | |
189 | |
190 // Compute the size of first instructions in this block. | |
191 uint compute_first_inst_size(uint& sum_size, uint inst_cnt, PhaseRegAlloc* ra); | |
192 | |
193 // Compute alignment padding if the block needs it. | |
194 // Align a loop if loop's padding is less or equal to padding limit | |
195 // or the size of first instructions in the loop > padding. | |
196 uint alignment_padding(int current_offset) { | |
197 int block_alignment = code_alignment(); | |
198 int max_pad = block_alignment-relocInfo::addr_unit(); | |
199 if( max_pad > 0 ) { | |
200 assert(is_power_of_2(max_pad+relocInfo::addr_unit()), ""); | |
201 int current_alignment = current_offset & max_pad; | |
202 if( current_alignment != 0 ) { | |
203 uint padding = (block_alignment-current_alignment) & max_pad; | |
418 | 204 if( has_loop_alignment() && |
205 padding > (uint)MaxLoopPad && | |
206 first_inst_size() <= padding ) { | |
207 return 0; | |
0 | 208 } |
418 | 209 return padding; |
0 | 210 } |
211 } | |
212 return 0; | |
213 } | |
214 | |
215 // Connector blocks. Connector blocks are basic blocks devoid of | |
216 // instructions, but may have relevant non-instruction Nodes, such as | |
217 // Phis or MergeMems. Such blocks are discovered and marked during the | |
218 // RemoveEmpty phase, and elided during Output. | |
219 bool _connector; | |
220 void set_connector() { _connector = true; } | |
221 bool is_connector() const { return _connector; }; | |
222 | |
418 | 223 // Loop_alignment will be set for blocks which are at the top of loops. |
224 // The block layout pass may rotate loops such that the loop head may not | |
225 // be the sequentially first block of the loop encountered in the linear | |
226 // list of blocks. If the layout pass is not run, loop alignment is set | |
227 // for each block which is the head of a loop. | |
228 uint _loop_alignment; | |
229 void set_loop_alignment(Block *loop_top) { | |
230 uint new_alignment = loop_top->compute_loop_alignment(); | |
231 if (new_alignment > _loop_alignment) { | |
232 _loop_alignment = new_alignment; | |
233 } | |
234 } | |
235 uint loop_alignment() const { return _loop_alignment; } | |
236 bool has_loop_alignment() const { return loop_alignment() > 0; } | |
237 | |
0 | 238 // Create a new Block with given head Node. |
239 // Creates the (empty) predecessor arrays. | |
240 Block( Arena *a, Node *headnode ) | |
241 : CFGElement(), | |
242 _nodes(a), | |
243 _succs(a), | |
244 _num_succs(0), | |
245 _pre_order(0), | |
246 _idom(0), | |
247 _loop(NULL), | |
248 _reg_pressure(0), | |
249 _ihrp_index(1), | |
250 _freg_pressure(0), | |
251 _fhrp_index(1), | |
252 _raise_LCA_mark(0), | |
253 _raise_LCA_visited(0), | |
254 _first_inst_size(999999), | |
418 | 255 _connector(false), |
256 _loop_alignment(0) { | |
0 | 257 _nodes.push(headnode); |
258 } | |
259 | |
260 // Index of 'end' Node | |
261 uint end_idx() const { | |
262 // %%%%% add a proj after every goto | |
263 // so (last->is_block_proj() != last) always, then simplify this code | |
264 // This will not give correct end_idx for block 0 when it only contains root. | |
265 int last_idx = _nodes.size() - 1; | |
266 Node *last = _nodes[last_idx]; | |
267 assert(last->is_block_proj() == last || last->is_block_proj() == _nodes[last_idx - _num_succs], ""); | |
268 return (last->is_block_proj() == last) ? last_idx : (last_idx - _num_succs); | |
269 } | |
270 | |
271 // Basic blocks have a Node which ends them. This Node determines which | |
272 // basic block follows this one in the program flow. This Node is either an | |
273 // IfNode, a GotoNode, a JmpNode, or a ReturnNode. | |
274 Node *end() const { return _nodes[end_idx()]; } | |
275 | |
276 // Add an instruction to an existing block. It must go after the head | |
277 // instruction and before the end instruction. | |
278 void add_inst( Node *n ) { _nodes.insert(end_idx(),n); } | |
279 // Find node in block | |
280 uint find_node( const Node *n ) const; | |
281 // Find and remove n from block list | |
282 void find_remove( const Node *n ); | |
283 | |
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284 // helper function that adds caller save registers to MachProjNode |
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285 void add_call_kills(MachProjNode *proj, RegMask& regs, const char* save_policy, bool exclude_soe); |
0 | 286 // Schedule a call next in the block |
287 uint sched_call(Matcher &matcher, Block_Array &bbs, uint node_cnt, Node_List &worklist, int *ready_cnt, MachCallNode *mcall, VectorSet &next_call); | |
288 | |
289 // Perform basic-block local scheduling | |
290 Node *select(PhaseCFG *cfg, Node_List &worklist, int *ready_cnt, VectorSet &next_call, uint sched_slot); | |
291 void set_next_call( Node *n, VectorSet &next_call, Block_Array &bbs ); | |
292 void needed_for_next_call(Node *this_call, VectorSet &next_call, Block_Array &bbs); | |
293 bool schedule_local(PhaseCFG *cfg, Matcher &m, int *ready_cnt, VectorSet &next_call); | |
294 // Cleanup if any code lands between a Call and his Catch | |
295 void call_catch_cleanup(Block_Array &bbs); | |
296 // Detect implicit-null-check opportunities. Basically, find NULL checks | |
297 // with suitable memory ops nearby. Use the memory op to do the NULL check. | |
298 // I can generate a memory op if there is not one nearby. | |
299 void implicit_null_check(PhaseCFG *cfg, Node *proj, Node *val, int allowed_reasons); | |
300 | |
301 // Return the empty status of a block | |
302 enum { not_empty, empty_with_goto, completely_empty }; | |
303 int is_Empty() const; | |
304 | |
305 // Forward through connectors | |
306 Block* non_connector() { | |
307 Block* s = this; | |
308 while (s->is_connector()) { | |
309 s = s->_succs[0]; | |
310 } | |
311 return s; | |
312 } | |
313 | |
418 | 314 // Return true if b is a successor of this block |
315 bool has_successor(Block* b) const { | |
316 for (uint i = 0; i < _num_succs; i++ ) { | |
317 if (non_connector_successor(i) == b) { | |
318 return true; | |
319 } | |
320 } | |
321 return false; | |
322 } | |
323 | |
0 | 324 // Successor block, after forwarding through connectors |
325 Block* non_connector_successor(int i) const { | |
326 return _succs[i]->non_connector(); | |
327 } | |
328 | |
329 // Examine block's code shape to predict if it is not commonly executed. | |
330 bool has_uncommon_code() const; | |
331 | |
332 // Use frequency calculations and code shape to predict if the block | |
333 // is uncommon. | |
334 bool is_uncommon( Block_Array &bbs ) const; | |
335 | |
336 #ifndef PRODUCT | |
337 // Debugging print of basic block | |
3851 | 338 void dump_bidx(const Block* orig, outputStream* st = tty) const; |
339 void dump_pred(const Block_Array *bbs, Block* orig, outputStream* st = tty) const; | |
340 void dump_head( const Block_Array *bbs, outputStream* st = tty ) const; | |
341 void dump() const; | |
0 | 342 void dump( const Block_Array *bbs ) const; |
343 #endif | |
344 }; | |
345 | |
346 | |
347 //------------------------------PhaseCFG--------------------------------------- | |
348 // Build an array of Basic Block pointers, one per Node. | |
349 class PhaseCFG : public Phase { | |
3939 | 350 friend class VMStructs; |
0 | 351 private: |
352 // Build a proper looking cfg. Return count of basic blocks | |
353 uint build_cfg(); | |
354 | |
355 // Perform DFS search. | |
356 // Setup 'vertex' as DFS to vertex mapping. | |
357 // Setup 'semi' as vertex to DFS mapping. | |
358 // Set 'parent' to DFS parent. | |
359 uint DFS( Tarjan *tarjan ); | |
360 | |
361 // Helper function to insert a node into a block | |
362 void schedule_node_into_block( Node *n, Block *b ); | |
363 | |
604 | 364 void replace_block_proj_ctrl( Node *n ); |
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365 |
0 | 366 // Set the basic block for pinned Nodes |
367 void schedule_pinned_nodes( VectorSet &visited ); | |
368 | |
369 // I'll need a few machine-specific GotoNodes. Clone from this one. | |
370 MachNode *_goto; | |
371 | |
372 Block* insert_anti_dependences(Block* LCA, Node* load, bool verify = false); | |
373 void verify_anti_dependences(Block* LCA, Node* load) { | |
374 assert(LCA == _bbs[load->_idx], "should already be scheduled"); | |
375 insert_anti_dependences(LCA, load, true); | |
376 } | |
377 | |
378 public: | |
379 PhaseCFG( Arena *a, RootNode *r, Matcher &m ); | |
380 | |
381 uint _num_blocks; // Count of basic blocks | |
382 Block_List _blocks; // List of basic blocks | |
383 RootNode *_root; // Root of whole program | |
384 Block_Array _bbs; // Map Nodes to owning Basic Block | |
385 Block *_broot; // Basic block of root | |
386 uint _rpo_ctr; | |
387 CFGLoop* _root_loop; | |
673 | 388 float _outer_loop_freq; // Outmost loop frequency |
0 | 389 |
390 // Per node latency estimation, valid only during GCM | |
1685 | 391 GrowableArray<uint> *_node_latency; |
0 | 392 |
393 #ifndef PRODUCT | |
394 bool _trace_opto_pipelining; // tracing flag | |
395 #endif | |
396 | |
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397 #ifdef ASSERT |
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398 Unique_Node_List _raw_oops; |
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399 #endif |
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400 |
0 | 401 // Build dominators |
402 void Dominators(); | |
403 | |
404 // Estimate block frequencies based on IfNode probabilities | |
405 void Estimate_Block_Frequency(); | |
406 | |
407 // Global Code Motion. See Click's PLDI95 paper. Place Nodes in specific | |
408 // basic blocks; i.e. _bbs now maps _idx for all Nodes to some Block. | |
409 void GlobalCodeMotion( Matcher &m, uint unique, Node_List &proj_list ); | |
410 | |
411 // Compute the (backwards) latency of a node from the uses | |
412 void latency_from_uses(Node *n); | |
413 | |
414 // Compute the (backwards) latency of a node from a single use | |
415 int latency_from_use(Node *n, const Node *def, Node *use); | |
416 | |
417 // Compute the (backwards) latency of a node from the uses of this instruction | |
418 void partial_latency_of_defs(Node *n); | |
419 | |
420 // Schedule Nodes early in their basic blocks. | |
421 bool schedule_early(VectorSet &visited, Node_List &roots); | |
422 | |
423 // For each node, find the latest block it can be scheduled into | |
424 // and then select the cheapest block between the latest and earliest | |
425 // block to place the node. | |
426 void schedule_late(VectorSet &visited, Node_List &stack); | |
427 | |
428 // Pick a block between early and late that is a cheaper alternative | |
429 // to late. Helper for schedule_late. | |
430 Block* hoist_to_cheaper_block(Block* LCA, Block* early, Node* self); | |
431 | |
432 // Compute the instruction global latency with a backwards walk | |
433 void ComputeLatenciesBackwards(VectorSet &visited, Node_List &stack); | |
434 | |
418 | 435 // Set loop alignment |
436 void set_loop_alignment(); | |
437 | |
0 | 438 // Remove empty basic blocks |
418 | 439 void remove_empty(); |
440 void fixup_flow(); | |
441 bool move_to_next(Block* bx, uint b_index); | |
442 void move_to_end(Block* bx, uint b_index); | |
443 void insert_goto_at(uint block_no, uint succ_no); | |
0 | 444 |
445 // Check for NeverBranch at block end. This needs to become a GOTO to the | |
446 // true target. NeverBranch are treated as a conditional branch that always | |
447 // goes the same direction for most of the optimizer and are used to give a | |
448 // fake exit path to infinite loops. At this late stage they need to turn | |
449 // into Goto's so that when you enter the infinite loop you indeed hang. | |
450 void convert_NeverBranch_to_Goto(Block *b); | |
451 | |
452 CFGLoop* create_loop_tree(); | |
453 | |
454 // Insert a node into a block, and update the _bbs | |
455 void insert( Block *b, uint idx, Node *n ) { | |
456 b->_nodes.insert( idx, n ); | |
457 _bbs.map( n->_idx, b ); | |
458 } | |
459 | |
460 #ifndef PRODUCT | |
461 bool trace_opto_pipelining() const { return _trace_opto_pipelining; } | |
462 | |
463 // Debugging print of CFG | |
464 void dump( ) const; // CFG only | |
465 void _dump_cfg( const Node *end, VectorSet &visited ) const; | |
466 void verify() const; | |
467 void dump_headers(); | |
468 #else | |
469 bool trace_opto_pipelining() const { return false; } | |
470 #endif | |
471 }; | |
472 | |
473 | |
418 | 474 //------------------------------UnionFind-------------------------------------- |
0 | 475 // Map Block indices to a block-index for a cfg-cover. |
476 // Array lookup in the optimized case. | |
477 class UnionFind : public ResourceObj { | |
478 uint _cnt, _max; | |
479 uint* _indices; | |
480 ReallocMark _nesting; // assertion check for reallocations | |
481 public: | |
482 UnionFind( uint max ); | |
483 void reset( uint max ); // Reset to identity map for [0..max] | |
484 | |
485 uint lookup( uint nidx ) const { | |
486 return _indices[nidx]; | |
487 } | |
488 uint operator[] (uint nidx) const { return lookup(nidx); } | |
489 | |
490 void map( uint from_idx, uint to_idx ) { | |
491 assert( from_idx < _cnt, "oob" ); | |
492 _indices[from_idx] = to_idx; | |
493 } | |
494 void extend( uint from_idx, uint to_idx ); | |
495 | |
496 uint Size() const { return _cnt; } | |
497 | |
498 uint Find( uint idx ) { | |
499 assert( idx < 65536, "Must fit into uint"); | |
500 uint uf_idx = lookup(idx); | |
501 return (uf_idx == idx) ? uf_idx : Find_compress(idx); | |
502 } | |
503 uint Find_compress( uint idx ); | |
504 uint Find_const( uint idx ) const; | |
505 void Union( uint idx1, uint idx2 ); | |
506 | |
507 }; | |
508 | |
509 //----------------------------BlockProbPair--------------------------- | |
510 // Ordered pair of Node*. | |
511 class BlockProbPair VALUE_OBJ_CLASS_SPEC { | |
512 protected: | |
513 Block* _target; // block target | |
514 float _prob; // probability of edge to block | |
515 public: | |
516 BlockProbPair() : _target(NULL), _prob(0.0) {} | |
517 BlockProbPair(Block* b, float p) : _target(b), _prob(p) {} | |
518 | |
519 Block* get_target() const { return _target; } | |
520 float get_prob() const { return _prob; } | |
521 }; | |
522 | |
523 //------------------------------CFGLoop------------------------------------------- | |
524 class CFGLoop : public CFGElement { | |
3939 | 525 friend class VMStructs; |
0 | 526 int _id; |
527 int _depth; | |
528 CFGLoop *_parent; // root of loop tree is the method level "pseudo" loop, it's parent is null | |
529 CFGLoop *_sibling; // null terminated list | |
530 CFGLoop *_child; // first child, use child's sibling to visit all immediately nested loops | |
531 GrowableArray<CFGElement*> _members; // list of members of loop | |
532 GrowableArray<BlockProbPair> _exits; // list of successor blocks and their probabilities | |
533 float _exit_prob; // probability any loop exit is taken on a single loop iteration | |
534 void update_succ_freq(Block* b, float freq); | |
535 | |
536 public: | |
537 CFGLoop(int id) : | |
538 CFGElement(), | |
539 _id(id), | |
540 _depth(0), | |
541 _parent(NULL), | |
542 _sibling(NULL), | |
543 _child(NULL), | |
544 _exit_prob(1.0f) {} | |
545 CFGLoop* parent() { return _parent; } | |
546 void push_pred(Block* blk, int i, Block_List& worklist, Block_Array& node_to_blk); | |
547 void add_member(CFGElement *s) { _members.push(s); } | |
548 void add_nested_loop(CFGLoop* cl); | |
549 Block* head() { | |
550 assert(_members.at(0)->is_block(), "head must be a block"); | |
551 Block* hd = _members.at(0)->as_Block(); | |
552 assert(hd->_loop == this, "just checking"); | |
553 assert(hd->head()->is_Loop(), "must begin with loop head node"); | |
554 return hd; | |
555 } | |
556 Block* backedge_block(); // Return the block on the backedge of the loop (else NULL) | |
557 void compute_loop_depth(int depth); | |
558 void compute_freq(); // compute frequency with loop assuming head freq 1.0f | |
559 void scale_freq(); // scale frequency by loop trip count (including outer loops) | |
673 | 560 float outer_loop_freq() const; // frequency of outer loop |
0 | 561 bool in_loop_nest(Block* b); |
562 float trip_count() const { return 1.0f / _exit_prob; } | |
563 virtual bool is_loop() { return true; } | |
564 int id() { return _id; } | |
565 | |
566 #ifndef PRODUCT | |
567 void dump( ) const; | |
568 void dump_tree() const; | |
569 #endif | |
570 }; | |
418 | 571 |
572 | |
573 //----------------------------------CFGEdge------------------------------------ | |
574 // A edge between two basic blocks that will be embodied by a branch or a | |
575 // fall-through. | |
576 class CFGEdge : public ResourceObj { | |
3939 | 577 friend class VMStructs; |
418 | 578 private: |
579 Block * _from; // Source basic block | |
580 Block * _to; // Destination basic block | |
581 float _freq; // Execution frequency (estimate) | |
582 int _state; | |
583 bool _infrequent; | |
584 int _from_pct; | |
585 int _to_pct; | |
586 | |
587 // Private accessors | |
588 int from_pct() const { return _from_pct; } | |
589 int to_pct() const { return _to_pct; } | |
590 int from_infrequent() const { return from_pct() < BlockLayoutMinDiamondPercentage; } | |
591 int to_infrequent() const { return to_pct() < BlockLayoutMinDiamondPercentage; } | |
592 | |
593 public: | |
594 enum { | |
595 open, // initial edge state; unprocessed | |
596 connected, // edge used to connect two traces together | |
597 interior // edge is interior to trace (could be backedge) | |
598 }; | |
599 | |
600 CFGEdge(Block *from, Block *to, float freq, int from_pct, int to_pct) : | |
601 _from(from), _to(to), _freq(freq), | |
602 _from_pct(from_pct), _to_pct(to_pct), _state(open) { | |
603 _infrequent = from_infrequent() || to_infrequent(); | |
604 } | |
605 | |
606 float freq() const { return _freq; } | |
607 Block* from() const { return _from; } | |
608 Block* to () const { return _to; } | |
609 int infrequent() const { return _infrequent; } | |
610 int state() const { return _state; } | |
611 | |
612 void set_state(int state) { _state = state; } | |
613 | |
614 #ifndef PRODUCT | |
615 void dump( ) const; | |
616 #endif | |
617 }; | |
618 | |
619 | |
620 //-----------------------------------Trace------------------------------------- | |
621 // An ordered list of basic blocks. | |
622 class Trace : public ResourceObj { | |
623 private: | |
624 uint _id; // Unique Trace id (derived from initial block) | |
625 Block ** _next_list; // Array mapping index to next block | |
626 Block ** _prev_list; // Array mapping index to previous block | |
627 Block * _first; // First block in the trace | |
628 Block * _last; // Last block in the trace | |
629 | |
630 // Return the block that follows "b" in the trace. | |
631 Block * next(Block *b) const { return _next_list[b->_pre_order]; } | |
632 void set_next(Block *b, Block *n) const { _next_list[b->_pre_order] = n; } | |
633 | |
605 | 634 // Return the block that precedes "b" in the trace. |
418 | 635 Block * prev(Block *b) const { return _prev_list[b->_pre_order]; } |
636 void set_prev(Block *b, Block *p) const { _prev_list[b->_pre_order] = p; } | |
637 | |
638 // We've discovered a loop in this trace. Reset last to be "b", and first as | |
639 // the block following "b | |
640 void break_loop_after(Block *b) { | |
641 _last = b; | |
642 _first = next(b); | |
643 set_prev(_first, NULL); | |
644 set_next(_last, NULL); | |
645 } | |
646 | |
647 public: | |
648 | |
649 Trace(Block *b, Block **next_list, Block **prev_list) : | |
650 _first(b), | |
651 _last(b), | |
652 _next_list(next_list), | |
653 _prev_list(prev_list), | |
654 _id(b->_pre_order) { | |
655 set_next(b, NULL); | |
656 set_prev(b, NULL); | |
657 }; | |
658 | |
659 // Return the id number | |
660 uint id() const { return _id; } | |
661 void set_id(uint id) { _id = id; } | |
662 | |
663 // Return the first block in the trace | |
664 Block * first_block() const { return _first; } | |
665 | |
666 // Return the last block in the trace | |
667 Block * last_block() const { return _last; } | |
668 | |
669 // Insert a trace in the middle of this one after b | |
670 void insert_after(Block *b, Trace *tr) { | |
671 set_next(tr->last_block(), next(b)); | |
672 if (next(b) != NULL) { | |
673 set_prev(next(b), tr->last_block()); | |
674 } | |
675 | |
676 set_next(b, tr->first_block()); | |
677 set_prev(tr->first_block(), b); | |
678 | |
679 if (b == _last) { | |
680 _last = tr->last_block(); | |
681 } | |
682 } | |
683 | |
684 void insert_before(Block *b, Trace *tr) { | |
685 Block *p = prev(b); | |
686 assert(p != NULL, "use append instead"); | |
687 insert_after(p, tr); | |
688 } | |
689 | |
690 // Append another trace to this one. | |
691 void append(Trace *tr) { | |
692 insert_after(_last, tr); | |
693 } | |
694 | |
695 // Append a block at the end of this trace | |
696 void append(Block *b) { | |
697 set_next(_last, b); | |
698 set_prev(b, _last); | |
699 _last = b; | |
700 } | |
701 | |
702 // Adjust the the blocks in this trace | |
703 void fixup_blocks(PhaseCFG &cfg); | |
704 bool backedge(CFGEdge *e); | |
705 | |
706 #ifndef PRODUCT | |
707 void dump( ) const; | |
708 #endif | |
709 }; | |
710 | |
711 //------------------------------PhaseBlockLayout------------------------------- | |
712 // Rearrange blocks into some canonical order, based on edges and their frequencies | |
713 class PhaseBlockLayout : public Phase { | |
3939 | 714 friend class VMStructs; |
418 | 715 PhaseCFG &_cfg; // Control flow graph |
716 | |
717 GrowableArray<CFGEdge *> *edges; | |
718 Trace **traces; | |
719 Block **next; | |
720 Block **prev; | |
721 UnionFind *uf; | |
722 | |
723 // Given a block, find its encompassing Trace | |
724 Trace * trace(Block *b) { | |
725 return traces[uf->Find_compress(b->_pre_order)]; | |
726 } | |
727 public: | |
728 PhaseBlockLayout(PhaseCFG &cfg); | |
729 | |
730 void find_edges(); | |
731 void grow_traces(); | |
732 void merge_traces(bool loose_connections); | |
733 void reorder_traces(int count); | |
734 void union_traces(Trace* from, Trace* to); | |
735 }; | |
1972 | 736 |
737 #endif // SHARE_VM_OPTO_BLOCK_HPP |