Mercurial > hg > truffle
annotate src/share/vm/opto/block.hpp @ 12170:8947af8a9cec
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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_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()); } |
0 | 316 // Find node in block |
317 uint find_node( const Node *n ) const; | |
318 // Find and remove n from block list | |
319 void find_remove( const Node *n ); | |
320 | |
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321 // helper function that adds caller save registers to MachProjNode |
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322 void add_call_kills(MachProjNode *proj, RegMask& regs, const char* save_policy, bool exclude_soe); |
0 | 323 // Schedule a call next in the block |
12023 | 324 uint sched_call(Matcher &matcher, PhaseCFG* cfg, uint node_cnt, Node_List &worklist, GrowableArray<int> &ready_cnt, MachCallNode *mcall, VectorSet &next_call); |
0 | 325 |
326 // Perform basic-block local scheduling | |
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327 Node *select(PhaseCFG *cfg, Node_List &worklist, GrowableArray<int> &ready_cnt, VectorSet &next_call, uint sched_slot); |
12023 | 328 void set_next_call( Node *n, VectorSet &next_call, PhaseCFG* cfg); |
329 void needed_for_next_call(Node *this_call, VectorSet &next_call, PhaseCFG* cfg); | |
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330 bool schedule_local(PhaseCFG *cfg, Matcher &m, GrowableArray<int> &ready_cnt, VectorSet &next_call); |
0 | 331 // Cleanup if any code lands between a Call and his Catch |
12023 | 332 void call_catch_cleanup(PhaseCFG* cfg, Compile *C); |
0 | 333 // Detect implicit-null-check opportunities. Basically, find NULL checks |
334 // with suitable memory ops nearby. Use the memory op to do the NULL check. | |
335 // I can generate a memory op if there is not one nearby. | |
336 void implicit_null_check(PhaseCFG *cfg, Node *proj, Node *val, int allowed_reasons); | |
337 | |
338 // Return the empty status of a block | |
339 enum { not_empty, empty_with_goto, completely_empty }; | |
340 int is_Empty() const; | |
341 | |
342 // Forward through connectors | |
343 Block* non_connector() { | |
344 Block* s = this; | |
345 while (s->is_connector()) { | |
346 s = s->_succs[0]; | |
347 } | |
348 return s; | |
349 } | |
350 | |
418 | 351 // Return true if b is a successor of this block |
352 bool has_successor(Block* b) const { | |
353 for (uint i = 0; i < _num_succs; i++ ) { | |
354 if (non_connector_successor(i) == b) { | |
355 return true; | |
356 } | |
357 } | |
358 return false; | |
359 } | |
360 | |
0 | 361 // Successor block, after forwarding through connectors |
362 Block* non_connector_successor(int i) const { | |
363 return _succs[i]->non_connector(); | |
364 } | |
365 | |
366 // Examine block's code shape to predict if it is not commonly executed. | |
367 bool has_uncommon_code() const; | |
368 | |
369 // Use frequency calculations and code shape to predict if the block | |
370 // is uncommon. | |
12023 | 371 bool is_uncommon(PhaseCFG* cfg) const; |
0 | 372 |
373 #ifndef PRODUCT | |
374 // Debugging print of basic block | |
3851 | 375 void dump_bidx(const Block* orig, outputStream* st = tty) const; |
12023 | 376 void dump_pred(const PhaseCFG* cfg, Block* orig, outputStream* st = tty) const; |
377 void dump_head(const PhaseCFG* cfg, outputStream* st = tty) const; | |
3851 | 378 void dump() const; |
12023 | 379 void dump(const PhaseCFG* cfg) const; |
0 | 380 #endif |
381 }; | |
382 | |
383 | |
384 //------------------------------PhaseCFG--------------------------------------- | |
385 // Build an array of Basic Block pointers, one per Node. | |
386 class PhaseCFG : public Phase { | |
3939 | 387 friend class VMStructs; |
0 | 388 private: |
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389 |
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390 // Root of whole program |
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391 RootNode* _root; |
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392 |
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393 // The block containing the root node |
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394 Block* _root_block; |
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395 |
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396 // List of basic blocks that are created during CFG creation |
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397 Block_List _blocks; |
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398 |
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399 // Count of basic blocks |
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400 uint _number_of_blocks; |
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401 |
12023 | 402 // Arena for the blocks to be stored in |
403 Arena* _block_arena; | |
404 | |
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405 // The matcher for this compilation |
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406 Matcher& _matcher; |
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407 |
12023 | 408 // Map nodes to owning basic block |
409 Block_Array _node_to_block_mapping; | |
410 | |
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411 // Loop from the root |
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412 CFGLoop* _root_loop; |
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413 |
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414 // Outmost loop frequency |
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415 float _outer_loop_frequency; |
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416 |
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417 // Per node latency estimation, valid only during GCM |
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418 GrowableArray<uint>* _node_latency; |
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419 |
0 | 420 // Build a proper looking cfg. Return count of basic blocks |
421 uint build_cfg(); | |
422 | |
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423 // Build the dominator tree so that we know where we can move instructions |
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424 void build_dominator_tree(); |
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425 |
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426 // Estimate block frequencies based on IfNode probabilities, so that we know where we want to move instructions |
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427 void estimate_block_frequency(); |
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428 |
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429 // Global Code Motion. See Click's PLDI95 paper. Place Nodes in specific |
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430 // basic blocks; i.e. _node_to_block_mapping now maps _idx for all Nodes to some Block. |
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431 // Move nodes to ensure correctness from GVN and also try to move nodes out of loops. |
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432 void global_code_motion(); |
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433 |
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434 // Schedule Nodes early in their basic blocks. |
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435 bool schedule_early(VectorSet &visited, Node_List &roots); |
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436 |
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437 // For each node, find the latest block it can be scheduled into |
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438 // and then select the cheapest block between the latest and earliest |
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439 // block to place the node. |
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440 void schedule_late(VectorSet &visited, Node_List &stack); |
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441 |
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442 // Compute the (backwards) latency of a node from a single use |
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443 int latency_from_use(Node *n, const Node *def, Node *use); |
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444 |
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445 // Compute the (backwards) latency of a node from the uses of this instruction |
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446 void partial_latency_of_defs(Node *n); |
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447 |
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448 // Compute the instruction global latency with a backwards walk |
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449 void compute_latencies_backwards(VectorSet &visited, Node_List &stack); |
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450 |
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451 // Pick a block between early and late that is a cheaper alternative |
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452 // to late. Helper for schedule_late. |
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453 Block* hoist_to_cheaper_block(Block* LCA, Block* early, Node* self); |
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454 |
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455 // Perform a Depth First Search (DFS). |
0 | 456 // Setup 'vertex' as DFS to vertex mapping. |
457 // Setup 'semi' as vertex to DFS mapping. | |
458 // Set 'parent' to DFS parent. | |
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459 uint do_DFS(Tarjan* tarjan, uint rpo_counter); |
0 | 460 |
461 // Helper function to insert a node into a block | |
462 void schedule_node_into_block( Node *n, Block *b ); | |
463 | |
604 | 464 void replace_block_proj_ctrl( Node *n ); |
601
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465 |
0 | 466 // Set the basic block for pinned Nodes |
467 void schedule_pinned_nodes( VectorSet &visited ); | |
468 | |
469 // I'll need a few machine-specific GotoNodes. Clone from this one. | |
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470 // Used when building the CFG and creating end nodes for blocks. |
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471 MachNode* _goto; |
0 | 472 |
473 Block* insert_anti_dependences(Block* LCA, Node* load, bool verify = false); | |
474 void verify_anti_dependences(Block* LCA, Node* load) { | |
12023 | 475 assert(LCA == get_block_for_node(load), "should already be scheduled"); |
0 | 476 insert_anti_dependences(LCA, load, true); |
477 } | |
478 | |
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479 bool move_to_next(Block* bx, uint b_index); |
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480 void move_to_end(Block* bx, uint b_index); |
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481 |
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482 void insert_goto_at(uint block_no, uint succ_no); |
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483 |
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484 // Check for NeverBranch at block end. This needs to become a GOTO to the |
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485 // true target. NeverBranch are treated as a conditional branch that always |
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486 // goes the same direction for most of the optimizer and are used to give a |
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487 // fake exit path to infinite loops. At this late stage they need to turn |
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488 // into Goto's so that when you enter the infinite loop you indeed hang. |
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489 void convert_NeverBranch_to_Goto(Block *b); |
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490 |
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491 CFGLoop* create_loop_tree(); |
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492 |
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493 #ifndef PRODUCT |
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494 bool _trace_opto_pipelining; // tracing flag |
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495 #endif |
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496 |
0 | 497 public: |
12023 | 498 PhaseCFG(Arena* arena, RootNode* root, Matcher& matcher); |
0 | 499 |
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500 void set_latency_for_node(Node* node, int latency) { |
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501 _node_latency->at_put_grow(node->_idx, latency); |
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502 } |
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503 |
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504 uint get_latency_for_node(Node* node) { |
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505 return _node_latency->at_grow(node->_idx); |
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506 } |
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507 |
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508 // Get the outer most frequency |
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509 float get_outer_loop_frequency() const { |
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510 return _outer_loop_frequency; |
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511 } |
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512 |
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513 // Get the root node of the CFG |
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514 RootNode* get_root_node() const { |
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515 return _root; |
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516 } |
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517 |
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518 // Get the block of the root node |
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519 Block* get_root_block() const { |
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520 return _root_block; |
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521 } |
0 | 522 |
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523 // Add a block at a position and moves the later ones one step |
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524 void add_block_at(uint pos, Block* block) { |
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525 _blocks.insert(pos, block); |
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526 _number_of_blocks++; |
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527 } |
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528 |
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529 // Adds a block to the top of the block list |
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530 void add_block(Block* block) { |
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531 _blocks.push(block); |
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532 _number_of_blocks++; |
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533 } |
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534 |
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535 // Clear the list of blocks |
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536 void clear_blocks() { |
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537 _blocks.reset(); |
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538 _number_of_blocks = 0; |
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539 } |
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540 |
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541 // Get the block at position pos in _blocks |
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542 Block* get_block(uint pos) const { |
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543 return _blocks[pos]; |
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544 } |
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545 |
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546 // Number of blocks |
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547 uint number_of_blocks() const { |
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548 return _number_of_blocks; |
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549 } |
12023 | 550 |
551 // set which block this node should reside in | |
552 void map_node_to_block(const Node* node, Block* block) { | |
553 _node_to_block_mapping.map(node->_idx, block); | |
554 } | |
555 | |
556 // removes the mapping from a node to a block | |
557 void unmap_node_from_block(const Node* node) { | |
558 _node_to_block_mapping.map(node->_idx, NULL); | |
559 } | |
560 | |
561 // get the block in which this node resides | |
562 Block* get_block_for_node(const Node* node) const { | |
563 return _node_to_block_mapping[node->_idx]; | |
564 } | |
565 | |
566 // does this node reside in a block; return true | |
567 bool has_block(const Node* node) const { | |
568 return (_node_to_block_mapping.lookup(node->_idx) != NULL); | |
569 } | |
570 | |
833
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571 #ifdef ASSERT |
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572 Unique_Node_List _raw_oops; |
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573 #endif |
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574 |
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575 // Do global code motion by first building dominator tree and estimate block frequency |
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576 // Returns true on success |
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577 bool do_global_code_motion(); |
0 | 578 |
579 // Compute the (backwards) latency of a node from the uses | |
580 void latency_from_uses(Node *n); | |
581 | |
418 | 582 // Set loop alignment |
583 void set_loop_alignment(); | |
584 | |
0 | 585 // Remove empty basic blocks |
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586 void remove_empty_blocks(); |
418 | 587 void fixup_flow(); |
0 | 588 |
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589 // Insert a node into a block at index and map the node to the block |
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590 void insert(Block *b, uint idx, Node *n) { |
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591 b->insert_node(n , idx); |
12023 | 592 map_node_to_block(n, b); |
0 | 593 } |
594 | |
595 #ifndef PRODUCT | |
596 bool trace_opto_pipelining() const { return _trace_opto_pipelining; } | |
597 | |
598 // Debugging print of CFG | |
599 void dump( ) const; // CFG only | |
600 void _dump_cfg( const Node *end, VectorSet &visited ) const; | |
601 void verify() const; | |
602 void dump_headers(); | |
603 #else | |
604 bool trace_opto_pipelining() const { return false; } | |
605 #endif | |
606 }; | |
607 | |
608 | |
418 | 609 //------------------------------UnionFind-------------------------------------- |
0 | 610 // Map Block indices to a block-index for a cfg-cover. |
611 // Array lookup in the optimized case. | |
612 class UnionFind : public ResourceObj { | |
613 uint _cnt, _max; | |
614 uint* _indices; | |
615 ReallocMark _nesting; // assertion check for reallocations | |
616 public: | |
617 UnionFind( uint max ); | |
618 void reset( uint max ); // Reset to identity map for [0..max] | |
619 | |
620 uint lookup( uint nidx ) const { | |
621 return _indices[nidx]; | |
622 } | |
623 uint operator[] (uint nidx) const { return lookup(nidx); } | |
624 | |
625 void map( uint from_idx, uint to_idx ) { | |
626 assert( from_idx < _cnt, "oob" ); | |
627 _indices[from_idx] = to_idx; | |
628 } | |
629 void extend( uint from_idx, uint to_idx ); | |
630 | |
631 uint Size() const { return _cnt; } | |
632 | |
633 uint Find( uint idx ) { | |
634 assert( idx < 65536, "Must fit into uint"); | |
635 uint uf_idx = lookup(idx); | |
636 return (uf_idx == idx) ? uf_idx : Find_compress(idx); | |
637 } | |
638 uint Find_compress( uint idx ); | |
639 uint Find_const( uint idx ) const; | |
640 void Union( uint idx1, uint idx2 ); | |
641 | |
642 }; | |
643 | |
644 //----------------------------BlockProbPair--------------------------- | |
645 // Ordered pair of Node*. | |
646 class BlockProbPair VALUE_OBJ_CLASS_SPEC { | |
647 protected: | |
648 Block* _target; // block target | |
649 float _prob; // probability of edge to block | |
650 public: | |
651 BlockProbPair() : _target(NULL), _prob(0.0) {} | |
652 BlockProbPair(Block* b, float p) : _target(b), _prob(p) {} | |
653 | |
654 Block* get_target() const { return _target; } | |
655 float get_prob() const { return _prob; } | |
656 }; | |
657 | |
658 //------------------------------CFGLoop------------------------------------------- | |
659 class CFGLoop : public CFGElement { | |
3939 | 660 friend class VMStructs; |
0 | 661 int _id; |
662 int _depth; | |
663 CFGLoop *_parent; // root of loop tree is the method level "pseudo" loop, it's parent is null | |
664 CFGLoop *_sibling; // null terminated list | |
665 CFGLoop *_child; // first child, use child's sibling to visit all immediately nested loops | |
666 GrowableArray<CFGElement*> _members; // list of members of loop | |
667 GrowableArray<BlockProbPair> _exits; // list of successor blocks and their probabilities | |
668 float _exit_prob; // probability any loop exit is taken on a single loop iteration | |
669 void update_succ_freq(Block* b, float freq); | |
670 | |
671 public: | |
672 CFGLoop(int id) : | |
673 CFGElement(), | |
674 _id(id), | |
675 _depth(0), | |
676 _parent(NULL), | |
677 _sibling(NULL), | |
678 _child(NULL), | |
679 _exit_prob(1.0f) {} | |
680 CFGLoop* parent() { return _parent; } | |
12023 | 681 void push_pred(Block* blk, int i, Block_List& worklist, PhaseCFG* cfg); |
0 | 682 void add_member(CFGElement *s) { _members.push(s); } |
683 void add_nested_loop(CFGLoop* cl); | |
684 Block* head() { | |
685 assert(_members.at(0)->is_block(), "head must be a block"); | |
686 Block* hd = _members.at(0)->as_Block(); | |
687 assert(hd->_loop == this, "just checking"); | |
688 assert(hd->head()->is_Loop(), "must begin with loop head node"); | |
689 return hd; | |
690 } | |
691 Block* backedge_block(); // Return the block on the backedge of the loop (else NULL) | |
692 void compute_loop_depth(int depth); | |
693 void compute_freq(); // compute frequency with loop assuming head freq 1.0f | |
694 void scale_freq(); // scale frequency by loop trip count (including outer loops) | |
673 | 695 float outer_loop_freq() const; // frequency of outer loop |
0 | 696 bool in_loop_nest(Block* b); |
697 float trip_count() const { return 1.0f / _exit_prob; } | |
698 virtual bool is_loop() { return true; } | |
699 int id() { return _id; } | |
700 | |
701 #ifndef PRODUCT | |
702 void dump( ) const; | |
703 void dump_tree() const; | |
704 #endif | |
705 }; | |
418 | 706 |
707 | |
708 //----------------------------------CFGEdge------------------------------------ | |
709 // A edge between two basic blocks that will be embodied by a branch or a | |
710 // fall-through. | |
711 class CFGEdge : public ResourceObj { | |
3939 | 712 friend class VMStructs; |
418 | 713 private: |
714 Block * _from; // Source basic block | |
715 Block * _to; // Destination basic block | |
716 float _freq; // Execution frequency (estimate) | |
717 int _state; | |
718 bool _infrequent; | |
719 int _from_pct; | |
720 int _to_pct; | |
721 | |
722 // Private accessors | |
723 int from_pct() const { return _from_pct; } | |
724 int to_pct() const { return _to_pct; } | |
725 int from_infrequent() const { return from_pct() < BlockLayoutMinDiamondPercentage; } | |
726 int to_infrequent() const { return to_pct() < BlockLayoutMinDiamondPercentage; } | |
727 | |
728 public: | |
729 enum { | |
730 open, // initial edge state; unprocessed | |
731 connected, // edge used to connect two traces together | |
732 interior // edge is interior to trace (could be backedge) | |
733 }; | |
734 | |
735 CFGEdge(Block *from, Block *to, float freq, int from_pct, int to_pct) : | |
736 _from(from), _to(to), _freq(freq), | |
737 _from_pct(from_pct), _to_pct(to_pct), _state(open) { | |
738 _infrequent = from_infrequent() || to_infrequent(); | |
739 } | |
740 | |
741 float freq() const { return _freq; } | |
742 Block* from() const { return _from; } | |
743 Block* to () const { return _to; } | |
744 int infrequent() const { return _infrequent; } | |
745 int state() const { return _state; } | |
746 | |
747 void set_state(int state) { _state = state; } | |
748 | |
749 #ifndef PRODUCT | |
750 void dump( ) const; | |
751 #endif | |
752 }; | |
753 | |
754 | |
755 //-----------------------------------Trace------------------------------------- | |
756 // An ordered list of basic blocks. | |
757 class Trace : public ResourceObj { | |
758 private: | |
759 uint _id; // Unique Trace id (derived from initial block) | |
760 Block ** _next_list; // Array mapping index to next block | |
761 Block ** _prev_list; // Array mapping index to previous block | |
762 Block * _first; // First block in the trace | |
763 Block * _last; // Last block in the trace | |
764 | |
765 // Return the block that follows "b" in the trace. | |
766 Block * next(Block *b) const { return _next_list[b->_pre_order]; } | |
767 void set_next(Block *b, Block *n) const { _next_list[b->_pre_order] = n; } | |
768 | |
605 | 769 // Return the block that precedes "b" in the trace. |
418 | 770 Block * prev(Block *b) const { return _prev_list[b->_pre_order]; } |
771 void set_prev(Block *b, Block *p) const { _prev_list[b->_pre_order] = p; } | |
772 | |
773 // We've discovered a loop in this trace. Reset last to be "b", and first as | |
774 // the block following "b | |
775 void break_loop_after(Block *b) { | |
776 _last = b; | |
777 _first = next(b); | |
778 set_prev(_first, NULL); | |
779 set_next(_last, NULL); | |
780 } | |
781 | |
782 public: | |
783 | |
784 Trace(Block *b, Block **next_list, Block **prev_list) : | |
785 _first(b), | |
786 _last(b), | |
787 _next_list(next_list), | |
788 _prev_list(prev_list), | |
789 _id(b->_pre_order) { | |
790 set_next(b, NULL); | |
791 set_prev(b, NULL); | |
792 }; | |
793 | |
794 // Return the id number | |
795 uint id() const { return _id; } | |
796 void set_id(uint id) { _id = id; } | |
797 | |
798 // Return the first block in the trace | |
799 Block * first_block() const { return _first; } | |
800 | |
801 // Return the last block in the trace | |
802 Block * last_block() const { return _last; } | |
803 | |
804 // Insert a trace in the middle of this one after b | |
805 void insert_after(Block *b, Trace *tr) { | |
806 set_next(tr->last_block(), next(b)); | |
807 if (next(b) != NULL) { | |
808 set_prev(next(b), tr->last_block()); | |
809 } | |
810 | |
811 set_next(b, tr->first_block()); | |
812 set_prev(tr->first_block(), b); | |
813 | |
814 if (b == _last) { | |
815 _last = tr->last_block(); | |
816 } | |
817 } | |
818 | |
819 void insert_before(Block *b, Trace *tr) { | |
820 Block *p = prev(b); | |
821 assert(p != NULL, "use append instead"); | |
822 insert_after(p, tr); | |
823 } | |
824 | |
825 // Append another trace to this one. | |
826 void append(Trace *tr) { | |
827 insert_after(_last, tr); | |
828 } | |
829 | |
830 // Append a block at the end of this trace | |
831 void append(Block *b) { | |
832 set_next(_last, b); | |
833 set_prev(b, _last); | |
834 _last = b; | |
835 } | |
836 | |
837 // Adjust the the blocks in this trace | |
838 void fixup_blocks(PhaseCFG &cfg); | |
839 bool backedge(CFGEdge *e); | |
840 | |
841 #ifndef PRODUCT | |
842 void dump( ) const; | |
843 #endif | |
844 }; | |
845 | |
846 //------------------------------PhaseBlockLayout------------------------------- | |
847 // Rearrange blocks into some canonical order, based on edges and their frequencies | |
848 class PhaseBlockLayout : public Phase { | |
3939 | 849 friend class VMStructs; |
418 | 850 PhaseCFG &_cfg; // Control flow graph |
851 | |
852 GrowableArray<CFGEdge *> *edges; | |
853 Trace **traces; | |
854 Block **next; | |
855 Block **prev; | |
856 UnionFind *uf; | |
857 | |
858 // Given a block, find its encompassing Trace | |
859 Trace * trace(Block *b) { | |
860 return traces[uf->Find_compress(b->_pre_order)]; | |
861 } | |
862 public: | |
863 PhaseBlockLayout(PhaseCFG &cfg); | |
864 | |
865 void find_edges(); | |
866 void grow_traces(); | |
867 void merge_traces(bool loose_connections); | |
868 void reorder_traces(int count); | |
869 void union_traces(Trace* from, Trace* to); | |
870 }; | |
1972 | 871 |
872 #endif // SHARE_VM_OPTO_BLOCK_HPP |